help
MAX3100 chip support
-config SERIAL_MAX3107
- tristate "MAX3107 support"
+config SERIAL_MAX310X
+ bool "MAX310X support"
depends on SPI
select SERIAL_CORE
+ select REGMAP_SPI if SPI
+ default n
help
- MAX3107 chip support
+ This selects support for an advanced UART from Maxim (Dallas).
+ Supported ICs are MAX3107, MAX3108.
+ Each IC contains 128 words each of receive and transmit FIFO
+ that can be controlled through I2C or high-speed SPI.
+
+ Say Y here if you want to support this ICs.
config SERIAL_DZ
bool "DECstation DZ serial driver"
obj-$(CONFIG_SERIAL_BFIN_SPORT) += bfin_sport_uart.o
obj-$(CONFIG_SERIAL_SAMSUNG) += samsung.o
obj-$(CONFIG_SERIAL_MAX3100) += max3100.o
-obj-$(CONFIG_SERIAL_MAX3107) += max3107.o
+obj-$(CONFIG_SERIAL_MAX310X) += max310x.o
obj-$(CONFIG_SERIAL_IP22_ZILOG) += ip22zilog.o
obj-$(CONFIG_SERIAL_MUX) += mux.o
obj-$(CONFIG_SERIAL_68328) += 68328serial.o
+++ /dev/null
-/*
- * max3107.c - spi uart protocol driver for Maxim 3107
- * Based on max3100.c
- * by Christian Pellegrin <chripell@evolware.org>
- * and max3110.c
- * by Feng Tang <feng.tang@intel.com>
- *
- * Copyright (C) Aavamobile 2009
- *
- * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- *
- * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
- *
- */
-
-#include <linux/delay.h>
-#include <linux/device.h>
-#include <linux/serial_core.h>
-#include <linux/serial.h>
-#include <linux/tty.h>
-#include <linux/tty_flip.h>
-#include <linux/gpio.h>
-#include <linux/spi/spi.h>
-#include <linux/freezer.h>
-#include <linux/module.h>
-#include "max3107.h"
-
-static const struct baud_table brg26_ext[] = {
- { 300, MAX3107_BRG26_B300 },
- { 600, MAX3107_BRG26_B600 },
- { 1200, MAX3107_BRG26_B1200 },
- { 2400, MAX3107_BRG26_B2400 },
- { 4800, MAX3107_BRG26_B4800 },
- { 9600, MAX3107_BRG26_B9600 },
- { 19200, MAX3107_BRG26_B19200 },
- { 57600, MAX3107_BRG26_B57600 },
- { 115200, MAX3107_BRG26_B115200 },
- { 230400, MAX3107_BRG26_B230400 },
- { 460800, MAX3107_BRG26_B460800 },
- { 921600, MAX3107_BRG26_B921600 },
- { 0, 0 }
-};
-
-static const struct baud_table brg13_int[] = {
- { 300, MAX3107_BRG13_IB300 },
- { 600, MAX3107_BRG13_IB600 },
- { 1200, MAX3107_BRG13_IB1200 },
- { 2400, MAX3107_BRG13_IB2400 },
- { 4800, MAX3107_BRG13_IB4800 },
- { 9600, MAX3107_BRG13_IB9600 },
- { 19200, MAX3107_BRG13_IB19200 },
- { 57600, MAX3107_BRG13_IB57600 },
- { 115200, MAX3107_BRG13_IB115200 },
- { 230400, MAX3107_BRG13_IB230400 },
- { 460800, MAX3107_BRG13_IB460800 },
- { 921600, MAX3107_BRG13_IB921600 },
- { 0, 0 }
-};
-
-static u32 get_new_brg(int baud, struct max3107_port *s)
-{
- int i;
- const struct baud_table *baud_tbl = s->baud_tbl;
-
- for (i = 0; i < 13; i++) {
- if (baud == baud_tbl[i].baud)
- return baud_tbl[i].new_brg;
- }
-
- return 0;
-}
-
-/* Perform SPI transfer for write/read of device register(s) */
-int max3107_rw(struct max3107_port *s, u8 *tx, u8 *rx, int len)
-{
- struct spi_message spi_msg;
- struct spi_transfer spi_xfer;
-
- /* Initialize SPI ,message */
- spi_message_init(&spi_msg);
-
- /* Initialize SPI transfer */
- memset(&spi_xfer, 0, sizeof spi_xfer);
- spi_xfer.len = len;
- spi_xfer.tx_buf = tx;
- spi_xfer.rx_buf = rx;
- spi_xfer.speed_hz = MAX3107_SPI_SPEED;
-
- /* Add SPI transfer to SPI message */
- spi_message_add_tail(&spi_xfer, &spi_msg);
-
-#ifdef DBG_TRACE_SPI_DATA
- {
- int i;
- pr_info("tx len %d:\n", spi_xfer.len);
- for (i = 0 ; i < spi_xfer.len && i < 32 ; i++)
- pr_info(" %x", ((u8 *)spi_xfer.tx_buf)[i]);
- pr_info("\n");
- }
-#endif
-
- /* Perform synchronous SPI transfer */
- if (spi_sync(s->spi, &spi_msg)) {
- dev_err(&s->spi->dev, "spi_sync failure\n");
- return -EIO;
- }
-
-#ifdef DBG_TRACE_SPI_DATA
- if (spi_xfer.rx_buf) {
- int i;
- pr_info("rx len %d:\n", spi_xfer.len);
- for (i = 0 ; i < spi_xfer.len && i < 32 ; i++)
- pr_info(" %x", ((u8 *)spi_xfer.rx_buf)[i]);
- pr_info("\n");
- }
-#endif
- return 0;
-}
-EXPORT_SYMBOL_GPL(max3107_rw);
-
-/* Puts received data to circular buffer */
-static void put_data_to_circ_buf(struct max3107_port *s, unsigned char *data,
- int len)
-{
- struct uart_port *port = &s->port;
- struct tty_struct *tty;
-
- if (!port->state)
- return;
-
- tty = port->state->port.tty;
- if (!tty)
- return;
-
- /* Insert received data */
- tty_insert_flip_string(tty, data, len);
- /* Update RX counter */
- port->icount.rx += len;
-}
-
-/* Handle data receiving */
-static void max3107_handlerx(struct max3107_port *s, u16 rxlvl)
-{
- int i;
- int j;
- int len; /* SPI transfer buffer length */
- u16 *buf;
- u8 *valid_str;
-
- if (!s->rx_enabled)
- /* RX is disabled */
- return;
-
- if (rxlvl == 0) {
- /* RX fifo is empty */
- return;
- } else if (rxlvl >= MAX3107_RX_FIFO_SIZE) {
- dev_warn(&s->spi->dev, "Possible RX FIFO overrun %d\n", rxlvl);
- /* Ensure sanity of RX level */
- rxlvl = MAX3107_RX_FIFO_SIZE;
- }
- if ((s->rxbuf == 0) || (s->rxstr == 0)) {
- dev_warn(&s->spi->dev, "Rx buffer/str isn't ready\n");
- return;
- }
- buf = s->rxbuf;
- valid_str = s->rxstr;
- while (rxlvl) {
- pr_debug("rxlvl %d\n", rxlvl);
- /* Clear buffer */
- memset(buf, 0, sizeof(u16) * (MAX3107_RX_FIFO_SIZE + 2));
- len = 0;
- if (s->irqen_reg & MAX3107_IRQ_RXFIFO_BIT) {
- /* First disable RX FIFO interrupt */
- pr_debug("Disabling RX INT\n");
- buf[0] = (MAX3107_WRITE_BIT | MAX3107_IRQEN_REG);
- s->irqen_reg &= ~MAX3107_IRQ_RXFIFO_BIT;
- buf[0] |= s->irqen_reg;
- len++;
- }
- /* Just increase the length by amount of words in FIFO since
- * buffer was zeroed and SPI transfer of 0x0000 means reading
- * from RX FIFO
- */
- len += rxlvl;
- /* Append RX level query */
- buf[len] = MAX3107_RXFIFOLVL_REG;
- len++;
-
- /* Perform the SPI transfer */
- if (max3107_rw(s, (u8 *)buf, (u8 *)buf, len * 2)) {
- dev_err(&s->spi->dev, "SPI transfer for RX h failed\n");
- return;
- }
-
- /* Skip RX FIFO interrupt disabling word if it was added */
- j = ((len - 1) - rxlvl);
- /* Read received words */
- for (i = 0; i < rxlvl; i++, j++)
- valid_str[i] = (u8)buf[j];
- put_data_to_circ_buf(s, valid_str, rxlvl);
- /* Get new RX level */
- rxlvl = (buf[len - 1] & MAX3107_SPI_RX_DATA_MASK);
- }
-
- if (s->rx_enabled) {
- /* RX still enabled, re-enable RX FIFO interrupt */
- pr_debug("Enabling RX INT\n");
- buf[0] = (MAX3107_WRITE_BIT | MAX3107_IRQEN_REG);
- s->irqen_reg |= MAX3107_IRQ_RXFIFO_BIT;
- buf[0] |= s->irqen_reg;
- if (max3107_rw(s, (u8 *)buf, NULL, 2))
- dev_err(&s->spi->dev, "RX FIFO INT enabling failed\n");
- }
-
- /* Push the received data to receivers */
- if (s->port.state->port.tty)
- tty_flip_buffer_push(s->port.state->port.tty);
-}
-
-
-/* Handle data sending */
-static void max3107_handletx(struct max3107_port *s)
-{
- struct circ_buf *xmit = &s->port.state->xmit;
- int i;
- unsigned long flags;
- int len; /* SPI transfer buffer length */
- u16 *buf;
-
- if (!s->tx_fifo_empty)
- /* Don't send more data before previous data is sent */
- return;
-
- if (uart_circ_empty(xmit) || uart_tx_stopped(&s->port))
- /* No data to send or TX is stopped */
- return;
-
- if (!s->txbuf) {
- dev_warn(&s->spi->dev, "Txbuf isn't ready\n");
- return;
- }
- buf = s->txbuf;
- /* Get length of data pending in circular buffer */
- len = uart_circ_chars_pending(xmit);
- if (len) {
- /* Limit to size of TX FIFO */
- if (len > MAX3107_TX_FIFO_SIZE)
- len = MAX3107_TX_FIFO_SIZE;
-
- pr_debug("txlen %d\n", len);
-
- /* Update TX counter */
- s->port.icount.tx += len;
-
- /* TX FIFO will no longer be empty */
- s->tx_fifo_empty = 0;
-
- i = 0;
- if (s->irqen_reg & MAX3107_IRQ_TXEMPTY_BIT) {
- /* First disable TX empty interrupt */
- pr_debug("Disabling TE INT\n");
- buf[i] = (MAX3107_WRITE_BIT | MAX3107_IRQEN_REG);
- s->irqen_reg &= ~MAX3107_IRQ_TXEMPTY_BIT;
- buf[i] |= s->irqen_reg;
- i++;
- len++;
- }
- /* Add data to send */
- spin_lock_irqsave(&s->port.lock, flags);
- for ( ; i < len ; i++) {
- buf[i] = (MAX3107_WRITE_BIT | MAX3107_THR_REG);
- buf[i] |= ((u16)xmit->buf[xmit->tail] &
- MAX3107_SPI_TX_DATA_MASK);
- xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
- }
- spin_unlock_irqrestore(&s->port.lock, flags);
- if (!(s->irqen_reg & MAX3107_IRQ_TXEMPTY_BIT)) {
- /* Enable TX empty interrupt */
- pr_debug("Enabling TE INT\n");
- buf[i] = (MAX3107_WRITE_BIT | MAX3107_IRQEN_REG);
- s->irqen_reg |= MAX3107_IRQ_TXEMPTY_BIT;
- buf[i] |= s->irqen_reg;
- i++;
- len++;
- }
- if (!s->tx_enabled) {
- /* Enable TX */
- pr_debug("Enable TX\n");
- buf[i] = (MAX3107_WRITE_BIT | MAX3107_MODE1_REG);
- spin_lock_irqsave(&s->data_lock, flags);
- s->mode1_reg &= ~MAX3107_MODE1_TXDIS_BIT;
- buf[i] |= s->mode1_reg;
- spin_unlock_irqrestore(&s->data_lock, flags);
- s->tx_enabled = 1;
- i++;
- len++;
- }
-
- /* Perform the SPI transfer */
- if (max3107_rw(s, (u8 *)buf, NULL, len*2)) {
- dev_err(&s->spi->dev,
- "SPI transfer TX handling failed\n");
- return;
- }
- }
-
- /* Indicate wake up if circular buffer is getting low on data */
- if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
- uart_write_wakeup(&s->port);
-
-}
-
-/* Handle interrupts
- * Also reads and returns current RX FIFO level
- */
-static u16 handle_interrupt(struct max3107_port *s)
-{
- u16 buf[4]; /* Buffer for SPI transfers */
- u8 irq_status;
- u16 rx_level;
- unsigned long flags;
-
- /* Read IRQ status register */
- buf[0] = MAX3107_IRQSTS_REG;
- /* Read status IRQ status register */
- buf[1] = MAX3107_STS_IRQSTS_REG;
- /* Read LSR IRQ status register */
- buf[2] = MAX3107_LSR_IRQSTS_REG;
- /* Query RX level */
- buf[3] = MAX3107_RXFIFOLVL_REG;
-
- if (max3107_rw(s, (u8 *)buf, (u8 *)buf, 8)) {
- dev_err(&s->spi->dev,
- "SPI transfer for INTR handling failed\n");
- return 0;
- }
-
- irq_status = (u8)buf[0];
- pr_debug("IRQSTS %x\n", irq_status);
- rx_level = (buf[3] & MAX3107_SPI_RX_DATA_MASK);
-
- if (irq_status & MAX3107_IRQ_LSR_BIT) {
- /* LSR interrupt */
- if (buf[2] & MAX3107_LSR_RXTO_BIT)
- /* RX timeout interrupt,
- * handled by normal RX handling
- */
- pr_debug("RX TO INT\n");
- }
-
- if (irq_status & MAX3107_IRQ_TXEMPTY_BIT) {
- /* Tx empty interrupt,
- * disable TX and set tx_fifo_empty flag
- */
- pr_debug("TE INT, disabling TX\n");
- buf[0] = (MAX3107_WRITE_BIT | MAX3107_MODE1_REG);
- spin_lock_irqsave(&s->data_lock, flags);
- s->mode1_reg |= MAX3107_MODE1_TXDIS_BIT;
- buf[0] |= s->mode1_reg;
- spin_unlock_irqrestore(&s->data_lock, flags);
- if (max3107_rw(s, (u8 *)buf, NULL, 2))
- dev_err(&s->spi->dev, "SPI transfer TX dis failed\n");
- s->tx_enabled = 0;
- s->tx_fifo_empty = 1;
- }
-
- if (irq_status & MAX3107_IRQ_RXFIFO_BIT)
- /* RX FIFO interrupt,
- * handled by normal RX handling
- */
- pr_debug("RFIFO INT\n");
-
- /* Return RX level */
- return rx_level;
-}
-
-/* Trigger work thread*/
-static void max3107_dowork(struct max3107_port *s)
-{
- if (!work_pending(&s->work) && !freezing(current) && !s->suspended)
- queue_work(s->workqueue, &s->work);
- else
- dev_warn(&s->spi->dev, "interrup isn't serviced normally!\n");
-}
-
-/* Work thread */
-static void max3107_work(struct work_struct *w)
-{
- struct max3107_port *s = container_of(w, struct max3107_port, work);
- u16 rxlvl = 0;
- int len; /* SPI transfer buffer length */
- u16 buf[5]; /* Buffer for SPI transfers */
- unsigned long flags;
-
- /* Start by reading current RX FIFO level */
- buf[0] = MAX3107_RXFIFOLVL_REG;
- if (max3107_rw(s, (u8 *)buf, (u8 *)buf, 2)) {
- dev_err(&s->spi->dev, "SPI transfer RX lev failed\n");
- rxlvl = 0;
- } else {
- rxlvl = (buf[0] & MAX3107_SPI_RX_DATA_MASK);
- }
-
- do {
- pr_debug("rxlvl %d\n", rxlvl);
-
- /* Handle RX */
- max3107_handlerx(s, rxlvl);
- rxlvl = 0;
-
- if (s->handle_irq) {
- /* Handle pending interrupts
- * We also get new RX FIFO level since new data may
- * have been received while pushing received data to
- * receivers
- */
- s->handle_irq = 0;
- rxlvl = handle_interrupt(s);
- }
-
- /* Handle TX */
- max3107_handletx(s);
-
- /* Handle configuration changes */
- len = 0;
- spin_lock_irqsave(&s->data_lock, flags);
- if (s->mode1_commit) {
- pr_debug("mode1_commit\n");
- buf[len] = (MAX3107_WRITE_BIT | MAX3107_MODE1_REG);
- buf[len++] |= s->mode1_reg;
- s->mode1_commit = 0;
- }
- if (s->lcr_commit) {
- pr_debug("lcr_commit\n");
- buf[len] = (MAX3107_WRITE_BIT | MAX3107_LCR_REG);
- buf[len++] |= s->lcr_reg;
- s->lcr_commit = 0;
- }
- if (s->brg_commit) {
- pr_debug("brg_commit\n");
- buf[len] = (MAX3107_WRITE_BIT | MAX3107_BRGDIVMSB_REG);
- buf[len++] |= ((s->brg_cfg >> 16) &
- MAX3107_SPI_TX_DATA_MASK);
- buf[len] = (MAX3107_WRITE_BIT | MAX3107_BRGDIVLSB_REG);
- buf[len++] |= ((s->brg_cfg >> 8) &
- MAX3107_SPI_TX_DATA_MASK);
- buf[len] = (MAX3107_WRITE_BIT | MAX3107_BRGCFG_REG);
- buf[len++] |= ((s->brg_cfg) & 0xff);
- s->brg_commit = 0;
- }
- spin_unlock_irqrestore(&s->data_lock, flags);
-
- if (len > 0) {
- if (max3107_rw(s, (u8 *)buf, NULL, len * 2))
- dev_err(&s->spi->dev,
- "SPI transfer config failed\n");
- }
-
- /* Reloop if interrupt handling indicated data in RX FIFO */
- } while (rxlvl);
-
-}
-
-/* Set sleep mode */
-static void max3107_set_sleep(struct max3107_port *s, int mode)
-{
- u16 buf[1]; /* Buffer for SPI transfer */
- unsigned long flags;
- pr_debug("enter, mode %d\n", mode);
-
- buf[0] = (MAX3107_WRITE_BIT | MAX3107_MODE1_REG);
- spin_lock_irqsave(&s->data_lock, flags);
- switch (mode) {
- case MAX3107_DISABLE_FORCED_SLEEP:
- s->mode1_reg &= ~MAX3107_MODE1_FORCESLEEP_BIT;
- break;
- case MAX3107_ENABLE_FORCED_SLEEP:
- s->mode1_reg |= MAX3107_MODE1_FORCESLEEP_BIT;
- break;
- case MAX3107_DISABLE_AUTOSLEEP:
- s->mode1_reg &= ~MAX3107_MODE1_AUTOSLEEP_BIT;
- break;
- case MAX3107_ENABLE_AUTOSLEEP:
- s->mode1_reg |= MAX3107_MODE1_AUTOSLEEP_BIT;
- break;
- default:
- spin_unlock_irqrestore(&s->data_lock, flags);
- dev_warn(&s->spi->dev, "invalid sleep mode\n");
- return;
- }
- buf[0] |= s->mode1_reg;
- spin_unlock_irqrestore(&s->data_lock, flags);
-
- if (max3107_rw(s, (u8 *)buf, NULL, 2))
- dev_err(&s->spi->dev, "SPI transfer sleep mode failed\n");
-
- if (mode == MAX3107_DISABLE_AUTOSLEEP ||
- mode == MAX3107_DISABLE_FORCED_SLEEP)
- msleep(MAX3107_WAKEUP_DELAY);
-}
-
-/* Perform full register initialization */
-static void max3107_register_init(struct max3107_port *s)
-{
- u16 buf[11]; /* Buffer for SPI transfers */
-
- /* 1. Configure baud rate, 9600 as default */
- s->baud = 9600;
- /* the below is default*/
- if (s->ext_clk) {
- s->brg_cfg = MAX3107_BRG26_B9600;
- s->baud_tbl = (struct baud_table *)brg26_ext;
- } else {
- s->brg_cfg = MAX3107_BRG13_IB9600;
- s->baud_tbl = (struct baud_table *)brg13_int;
- }
-
- if (s->pdata->init)
- s->pdata->init(s);
-
- buf[0] = (MAX3107_WRITE_BIT | MAX3107_BRGDIVMSB_REG)
- | ((s->brg_cfg >> 16) & MAX3107_SPI_TX_DATA_MASK);
- buf[1] = (MAX3107_WRITE_BIT | MAX3107_BRGDIVLSB_REG)
- | ((s->brg_cfg >> 8) & MAX3107_SPI_TX_DATA_MASK);
- buf[2] = (MAX3107_WRITE_BIT | MAX3107_BRGCFG_REG)
- | ((s->brg_cfg) & 0xff);
-
- /* 2. Configure LCR register, 8N1 mode by default */
- s->lcr_reg = MAX3107_LCR_WORD_LEN_8;
- buf[3] = (MAX3107_WRITE_BIT | MAX3107_LCR_REG)
- | s->lcr_reg;
-
- /* 3. Configure MODE 1 register */
- s->mode1_reg = 0;
- /* Enable IRQ pin */
- s->mode1_reg |= MAX3107_MODE1_IRQSEL_BIT;
- /* Disable TX */
- s->mode1_reg |= MAX3107_MODE1_TXDIS_BIT;
- s->tx_enabled = 0;
- /* RX is enabled */
- s->rx_enabled = 1;
- buf[4] = (MAX3107_WRITE_BIT | MAX3107_MODE1_REG)
- | s->mode1_reg;
-
- /* 4. Configure MODE 2 register */
- buf[5] = (MAX3107_WRITE_BIT | MAX3107_MODE2_REG);
- if (s->loopback) {
- /* Enable loopback */
- buf[5] |= MAX3107_MODE2_LOOPBACK_BIT;
- }
- /* Reset FIFOs */
- buf[5] |= MAX3107_MODE2_FIFORST_BIT;
- s->tx_fifo_empty = 1;
-
- /* 5. Configure FIFO trigger level register */
- buf[6] = (MAX3107_WRITE_BIT | MAX3107_FIFOTRIGLVL_REG);
- /* RX FIFO trigger for 16 words, TX FIFO trigger not used */
- buf[6] |= (MAX3107_FIFOTRIGLVL_RX(16) | MAX3107_FIFOTRIGLVL_TX(0));
-
- /* 6. Configure flow control levels */
- buf[7] = (MAX3107_WRITE_BIT | MAX3107_FLOWLVL_REG);
- /* Flow control halt level 96, resume level 48 */
- buf[7] |= (MAX3107_FLOWLVL_RES(48) | MAX3107_FLOWLVL_HALT(96));
-
- /* 7. Configure flow control */
- buf[8] = (MAX3107_WRITE_BIT | MAX3107_FLOWCTRL_REG);
- /* Enable auto CTS and auto RTS flow control */
- buf[8] |= (MAX3107_FLOWCTRL_AUTOCTS_BIT | MAX3107_FLOWCTRL_AUTORTS_BIT);
-
- /* 8. Configure RX timeout register */
- buf[9] = (MAX3107_WRITE_BIT | MAX3107_RXTO_REG);
- /* Timeout after 48 character intervals */
- buf[9] |= 0x0030;
-
- /* 9. Configure LSR interrupt enable register */
- buf[10] = (MAX3107_WRITE_BIT | MAX3107_LSR_IRQEN_REG);
- /* Enable RX timeout interrupt */
- buf[10] |= MAX3107_LSR_RXTO_BIT;
-
- /* Perform SPI transfer */
- if (max3107_rw(s, (u8 *)buf, NULL, 22))
- dev_err(&s->spi->dev, "SPI transfer for init failed\n");
-
- /* 10. Clear IRQ status register by reading it */
- buf[0] = MAX3107_IRQSTS_REG;
-
- /* 11. Configure interrupt enable register */
- /* Enable LSR interrupt */
- s->irqen_reg = MAX3107_IRQ_LSR_BIT;
- /* Enable RX FIFO interrupt */
- s->irqen_reg |= MAX3107_IRQ_RXFIFO_BIT;
- buf[1] = (MAX3107_WRITE_BIT | MAX3107_IRQEN_REG)
- | s->irqen_reg;
-
- /* 12. Clear FIFO reset that was set in step 6 */
- buf[2] = (MAX3107_WRITE_BIT | MAX3107_MODE2_REG);
- if (s->loopback) {
- /* Keep loopback enabled */
- buf[2] |= MAX3107_MODE2_LOOPBACK_BIT;
- }
-
- /* Perform SPI transfer */
- if (max3107_rw(s, (u8 *)buf, (u8 *)buf, 6))
- dev_err(&s->spi->dev, "SPI transfer for init failed\n");
-
-}
-
-/* IRQ handler */
-static irqreturn_t max3107_irq(int irqno, void *dev_id)
-{
- struct max3107_port *s = dev_id;
-
- if (irqno != s->spi->irq) {
- /* Unexpected IRQ */
- return IRQ_NONE;
- }
-
- /* Indicate irq */
- s->handle_irq = 1;
-
- /* Trigger work thread */
- max3107_dowork(s);
-
- return IRQ_HANDLED;
-}
-
-/* HW suspension function
- *
- * Currently autosleep is used to decrease current consumption, alternative
- * approach would be to set the chip to reset mode if UART is not being
- * used but that would mess the GPIOs
- *
- */
-void max3107_hw_susp(struct max3107_port *s, int suspend)
-{
- pr_debug("enter, suspend %d\n", suspend);
-
- if (suspend) {
- /* Suspend requested,
- * enable autosleep to decrease current consumption
- */
- s->suspended = 1;
- max3107_set_sleep(s, MAX3107_ENABLE_AUTOSLEEP);
- } else {
- /* Resume requested,
- * disable autosleep
- */
- s->suspended = 0;
- max3107_set_sleep(s, MAX3107_DISABLE_AUTOSLEEP);
- }
-}
-EXPORT_SYMBOL_GPL(max3107_hw_susp);
-
-/* Modem status IRQ enabling */
-static void max3107_enable_ms(struct uart_port *port)
-{
- /* Modem status not supported */
-}
-
-/* Data send function */
-static void max3107_start_tx(struct uart_port *port)
-{
- struct max3107_port *s = container_of(port, struct max3107_port, port);
-
- /* Trigger work thread for sending data */
- max3107_dowork(s);
-}
-
-/* Function for checking that there is no pending transfers */
-static unsigned int max3107_tx_empty(struct uart_port *port)
-{
- struct max3107_port *s = container_of(port, struct max3107_port, port);
-
- pr_debug("returning %d\n",
- (s->tx_fifo_empty && uart_circ_empty(&s->port.state->xmit)));
- return s->tx_fifo_empty && uart_circ_empty(&s->port.state->xmit);
-}
-
-/* Function for stopping RX */
-static void max3107_stop_rx(struct uart_port *port)
-{
- struct max3107_port *s = container_of(port, struct max3107_port, port);
- unsigned long flags;
-
- /* Set RX disabled in MODE 1 register */
- spin_lock_irqsave(&s->data_lock, flags);
- s->mode1_reg |= MAX3107_MODE1_RXDIS_BIT;
- s->mode1_commit = 1;
- spin_unlock_irqrestore(&s->data_lock, flags);
- /* Set RX disabled */
- s->rx_enabled = 0;
- /* Trigger work thread for doing the actual configuration change */
- max3107_dowork(s);
-}
-
-/* Function for returning control pin states */
-static unsigned int max3107_get_mctrl(struct uart_port *port)
-{
- /* DCD and DSR are not wired and CTS/RTS is handled automatically
- * so just indicate DSR and CAR asserted
- */
- return TIOCM_DSR | TIOCM_CAR;
-}
-
-/* Function for setting control pin states */
-static void max3107_set_mctrl(struct uart_port *port, unsigned int mctrl)
-{
- /* DCD and DSR are not wired and CTS/RTS is hadnled automatically
- * so do nothing
- */
-}
-
-/* Function for configuring UART parameters */
-static void max3107_set_termios(struct uart_port *port,
- struct ktermios *termios,
- struct ktermios *old)
-{
- struct max3107_port *s = container_of(port, struct max3107_port, port);
- struct tty_struct *tty;
- int baud;
- u16 new_lcr = 0;
- u32 new_brg = 0;
- unsigned long flags;
-
- if (!port->state)
- return;
-
- tty = port->state->port.tty;
- if (!tty)
- return;
-
- /* Get new LCR register values */
- /* Word size */
- if ((termios->c_cflag & CSIZE) == CS7)
- new_lcr |= MAX3107_LCR_WORD_LEN_7;
- else
- new_lcr |= MAX3107_LCR_WORD_LEN_8;
-
- /* Parity */
- if (termios->c_cflag & PARENB) {
- new_lcr |= MAX3107_LCR_PARITY_BIT;
- if (!(termios->c_cflag & PARODD))
- new_lcr |= MAX3107_LCR_EVENPARITY_BIT;
- }
-
- /* Stop bits */
- if (termios->c_cflag & CSTOPB) {
- /* 2 stop bits */
- new_lcr |= MAX3107_LCR_STOPLEN_BIT;
- }
-
- /* Mask termios capabilities we don't support */
- termios->c_cflag &= ~CMSPAR;
-
- /* Set status ignore mask */
- s->port.ignore_status_mask = 0;
- if (termios->c_iflag & IGNPAR)
- s->port.ignore_status_mask |= MAX3107_ALL_ERRORS;
-
- /* Set low latency to immediately handle pushed data */
- s->port.state->port.tty->low_latency = 1;
-
- /* Get new baud rate generator configuration */
- baud = tty_get_baud_rate(tty);
-
- spin_lock_irqsave(&s->data_lock, flags);
- new_brg = get_new_brg(baud, s);
- /* if can't find the corrent config, use previous */
- if (!new_brg) {
- baud = s->baud;
- new_brg = s->brg_cfg;
- }
- spin_unlock_irqrestore(&s->data_lock, flags);
- tty_termios_encode_baud_rate(termios, baud, baud);
- s->baud = baud;
-
- /* Update timeout according to new baud rate */
- uart_update_timeout(port, termios->c_cflag, baud);
-
- spin_lock_irqsave(&s->data_lock, flags);
- if (s->lcr_reg != new_lcr) {
- s->lcr_reg = new_lcr;
- s->lcr_commit = 1;
- }
- if (s->brg_cfg != new_brg) {
- s->brg_cfg = new_brg;
- s->brg_commit = 1;
- }
- spin_unlock_irqrestore(&s->data_lock, flags);
-
- /* Trigger work thread for doing the actual configuration change */
- max3107_dowork(s);
-}
-
-/* Port shutdown function */
-static void max3107_shutdown(struct uart_port *port)
-{
- struct max3107_port *s = container_of(port, struct max3107_port, port);
-
- if (s->suspended && s->pdata->hw_suspend)
- s->pdata->hw_suspend(s, 0);
-
- /* Free the interrupt */
- free_irq(s->spi->irq, s);
-
- if (s->workqueue) {
- /* Flush and destroy work queue */
- flush_workqueue(s->workqueue);
- destroy_workqueue(s->workqueue);
- s->workqueue = NULL;
- }
-
- /* Suspend HW */
- if (s->pdata->hw_suspend)
- s->pdata->hw_suspend(s, 1);
-}
-
-/* Port startup function */
-static int max3107_startup(struct uart_port *port)
-{
- struct max3107_port *s = container_of(port, struct max3107_port, port);
-
- /* Initialize work queue */
- s->workqueue = create_freezable_workqueue("max3107");
- if (!s->workqueue) {
- dev_err(&s->spi->dev, "Workqueue creation failed\n");
- return -EBUSY;
- }
- INIT_WORK(&s->work, max3107_work);
-
- /* Setup IRQ */
- if (request_irq(s->spi->irq, max3107_irq, IRQF_TRIGGER_FALLING,
- "max3107", s)) {
- dev_err(&s->spi->dev, "IRQ reguest failed\n");
- destroy_workqueue(s->workqueue);
- s->workqueue = NULL;
- return -EBUSY;
- }
-
- /* Resume HW */
- if (s->pdata->hw_suspend)
- s->pdata->hw_suspend(s, 0);
-
- /* Init registers */
- max3107_register_init(s);
-
- return 0;
-}
-
-/* Port type function */
-static const char *max3107_type(struct uart_port *port)
-{
- struct max3107_port *s = container_of(port, struct max3107_port, port);
- return s->spi->modalias;
-}
-
-/* Port release function */
-static void max3107_release_port(struct uart_port *port)
-{
- /* Do nothing */
-}
-
-/* Port request function */
-static int max3107_request_port(struct uart_port *port)
-{
- /* Do nothing */
- return 0;
-}
-
-/* Port config function */
-static void max3107_config_port(struct uart_port *port, int flags)
-{
- struct max3107_port *s = container_of(port, struct max3107_port, port);
- s->port.type = PORT_MAX3107;
-}
-
-/* Port verify function */
-static int max3107_verify_port(struct uart_port *port,
- struct serial_struct *ser)
-{
- if (ser->type == PORT_UNKNOWN || ser->type == PORT_MAX3107)
- return 0;
-
- return -EINVAL;
-}
-
-/* Port stop TX function */
-static void max3107_stop_tx(struct uart_port *port)
-{
- /* Do nothing */
-}
-
-/* Port break control function */
-static void max3107_break_ctl(struct uart_port *port, int break_state)
-{
- /* We don't support break control, do nothing */
-}
-
-
-/* Port functions */
-static struct uart_ops max3107_ops = {
- .tx_empty = max3107_tx_empty,
- .set_mctrl = max3107_set_mctrl,
- .get_mctrl = max3107_get_mctrl,
- .stop_tx = max3107_stop_tx,
- .start_tx = max3107_start_tx,
- .stop_rx = max3107_stop_rx,
- .enable_ms = max3107_enable_ms,
- .break_ctl = max3107_break_ctl,
- .startup = max3107_startup,
- .shutdown = max3107_shutdown,
- .set_termios = max3107_set_termios,
- .type = max3107_type,
- .release_port = max3107_release_port,
- .request_port = max3107_request_port,
- .config_port = max3107_config_port,
- .verify_port = max3107_verify_port,
-};
-
-/* UART driver data */
-static struct uart_driver max3107_uart_driver = {
- .owner = THIS_MODULE,
- .driver_name = "ttyMAX",
- .dev_name = "ttyMAX",
- .nr = 1,
-};
-
-static int driver_registered = 0;
-
-
-
-/* 'Generic' platform data */
-static struct max3107_plat generic_plat_data = {
- .loopback = 0,
- .ext_clk = 1,
- .hw_suspend = max3107_hw_susp,
- .polled_mode = 0,
- .poll_time = 0,
-};
-
-
-/*******************************************************************/
-
-/**
- * max3107_probe - SPI bus probe entry point
- * @spi: the spi device
- *
- * SPI wants us to probe this device and if appropriate claim it.
- * Perform any platform specific requirements and then initialise
- * the device.
- */
-
-int max3107_probe(struct spi_device *spi, struct max3107_plat *pdata)
-{
- struct max3107_port *s;
- u16 buf[2]; /* Buffer for SPI transfers */
- int retval;
-
- pr_info("enter max3107 probe\n");
-
- /* Allocate port structure */
- s = kzalloc(sizeof(*s), GFP_KERNEL);
- if (!s) {
- pr_err("Allocating port structure failed\n");
- return -ENOMEM;
- }
-
- s->pdata = pdata;
-
- /* SPI Rx buffer
- * +2 for RX FIFO interrupt
- * disabling and RX level query
- */
- s->rxbuf = kzalloc(sizeof(u16) * (MAX3107_RX_FIFO_SIZE+2), GFP_KERNEL);
- if (!s->rxbuf) {
- pr_err("Allocating RX buffer failed\n");
- retval = -ENOMEM;
- goto err_free4;
- }
- s->rxstr = kzalloc(sizeof(u8) * MAX3107_RX_FIFO_SIZE, GFP_KERNEL);
- if (!s->rxstr) {
- pr_err("Allocating RX buffer failed\n");
- retval = -ENOMEM;
- goto err_free3;
- }
- /* SPI Tx buffer
- * SPI transfer buffer
- * +3 for TX FIFO empty
- * interrupt disabling and
- * enabling and TX enabling
- */
- s->txbuf = kzalloc(sizeof(u16) * MAX3107_TX_FIFO_SIZE + 3, GFP_KERNEL);
- if (!s->txbuf) {
- pr_err("Allocating TX buffer failed\n");
- retval = -ENOMEM;
- goto err_free2;
- }
- /* Initialize shared data lock */
- spin_lock_init(&s->data_lock);
-
- /* SPI intializations */
- dev_set_drvdata(&spi->dev, s);
- spi->mode = SPI_MODE_0;
- spi->dev.platform_data = pdata;
- spi->bits_per_word = 16;
- s->ext_clk = pdata->ext_clk;
- s->loopback = pdata->loopback;
- spi_setup(spi);
- s->spi = spi;
-
- /* Check REV ID to ensure we are talking to what we expect */
- buf[0] = MAX3107_REVID_REG;
- if (max3107_rw(s, (u8 *)buf, (u8 *)buf, 2)) {
- dev_err(&s->spi->dev, "SPI transfer for REVID read failed\n");
- retval = -EIO;
- goto err_free1;
- }
- if ((buf[0] & MAX3107_SPI_RX_DATA_MASK) != MAX3107_REVID1 &&
- (buf[0] & MAX3107_SPI_RX_DATA_MASK) != MAX3107_REVID2) {
- dev_err(&s->spi->dev, "REVID %x does not match\n",
- (buf[0] & MAX3107_SPI_RX_DATA_MASK));
- retval = -ENODEV;
- goto err_free1;
- }
-
- /* Disable all interrupts */
- buf[0] = (MAX3107_WRITE_BIT | MAX3107_IRQEN_REG | 0x0000);
- buf[0] |= 0x0000;
-
- /* Configure clock source */
- buf[1] = (MAX3107_WRITE_BIT | MAX3107_CLKSRC_REG);
- if (s->ext_clk) {
- /* External clock */
- buf[1] |= MAX3107_CLKSRC_EXTCLK_BIT;
- }
-
- /* PLL bypass ON */
- buf[1] |= MAX3107_CLKSRC_PLLBYP_BIT;
-
- /* Perform SPI transfer */
- if (max3107_rw(s, (u8 *)buf, NULL, 4)) {
- dev_err(&s->spi->dev, "SPI transfer for init failed\n");
- retval = -EIO;
- goto err_free1;
- }
-
- /* Register UART driver */
- if (!driver_registered) {
- retval = uart_register_driver(&max3107_uart_driver);
- if (retval) {
- dev_err(&s->spi->dev, "Registering UART driver failed\n");
- goto err_free1;
- }
- driver_registered = 1;
- }
-
- /* Initialize UART port data */
- s->port.fifosize = 128;
- s->port.ops = &max3107_ops;
- s->port.line = 0;
- s->port.dev = &spi->dev;
- s->port.uartclk = 9600;
- s->port.flags = UPF_SKIP_TEST | UPF_BOOT_AUTOCONF;
- s->port.irq = s->spi->irq;
- s->port.type = PORT_MAX3107;
-
- /* Add UART port */
- retval = uart_add_one_port(&max3107_uart_driver, &s->port);
- if (retval < 0) {
- dev_err(&s->spi->dev, "Adding UART port failed\n");
- goto err_free1;
- }
-
- if (pdata->configure) {
- retval = pdata->configure(s);
- if (retval < 0)
- goto err_free1;
- }
-
- /* Go to suspend mode */
- if (pdata->hw_suspend)
- pdata->hw_suspend(s, 1);
-
- return 0;
-
-err_free1:
- kfree(s->txbuf);
-err_free2:
- kfree(s->rxstr);
-err_free3:
- kfree(s->rxbuf);
-err_free4:
- kfree(s);
- return retval;
-}
-EXPORT_SYMBOL_GPL(max3107_probe);
-
-/* Driver remove function */
-int max3107_remove(struct spi_device *spi)
-{
- struct max3107_port *s = dev_get_drvdata(&spi->dev);
-
- pr_info("enter max3107 remove\n");
-
- /* Remove port */
- if (uart_remove_one_port(&max3107_uart_driver, &s->port))
- dev_warn(&s->spi->dev, "Removing UART port failed\n");
-
-
- /* Free TxRx buffer */
- kfree(s->rxbuf);
- kfree(s->rxstr);
- kfree(s->txbuf);
-
- /* Free port structure */
- kfree(s);
-
- return 0;
-}
-EXPORT_SYMBOL_GPL(max3107_remove);
-
-/* Driver suspend function */
-int max3107_suspend(struct spi_device *spi, pm_message_t state)
-{
-#ifdef CONFIG_PM
- struct max3107_port *s = dev_get_drvdata(&spi->dev);
-
- pr_debug("enter suspend\n");
-
- /* Suspend UART port */
- uart_suspend_port(&max3107_uart_driver, &s->port);
-
- /* Go to suspend mode */
- if (s->pdata->hw_suspend)
- s->pdata->hw_suspend(s, 1);
-#endif /* CONFIG_PM */
- return 0;
-}
-EXPORT_SYMBOL_GPL(max3107_suspend);
-
-/* Driver resume function */
-int max3107_resume(struct spi_device *spi)
-{
-#ifdef CONFIG_PM
- struct max3107_port *s = dev_get_drvdata(&spi->dev);
-
- pr_debug("enter resume\n");
-
- /* Resume from suspend */
- if (s->pdata->hw_suspend)
- s->pdata->hw_suspend(s, 0);
-
- /* Resume UART port */
- uart_resume_port(&max3107_uart_driver, &s->port);
-#endif /* CONFIG_PM */
- return 0;
-}
-EXPORT_SYMBOL_GPL(max3107_resume);
-
-static int max3107_probe_generic(struct spi_device *spi)
-{
- return max3107_probe(spi, &generic_plat_data);
-}
-
-/* Spi driver data */
-static struct spi_driver max3107_driver = {
- .driver = {
- .name = "max3107",
- .owner = THIS_MODULE,
- },
- .probe = max3107_probe_generic,
- .remove = __devexit_p(max3107_remove),
- .suspend = max3107_suspend,
- .resume = max3107_resume,
-};
-
-/* Driver init function */
-static int __init max3107_init(void)
-{
- pr_info("enter max3107 init\n");
- return spi_register_driver(&max3107_driver);
-}
-
-/* Driver exit function */
-static void __exit max3107_exit(void)
-{
- pr_info("enter max3107 exit\n");
- /* Unregister UART driver */
- if (driver_registered)
- uart_unregister_driver(&max3107_uart_driver);
- spi_unregister_driver(&max3107_driver);
-}
-
-module_init(max3107_init);
-module_exit(max3107_exit);
-
-MODULE_DESCRIPTION("MAX3107 driver");
-MODULE_AUTHOR("Aavamobile");
-MODULE_ALIAS("spi:max3107");
-MODULE_LICENSE("GPL v2");
+++ /dev/null
-/*
- * max3107.h - spi uart protocol driver header for Maxim 3107
- *
- * Copyright (C) Aavamobile 2009
- * Based on serial_max3100.h by Christian Pellegrin
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- */
-
-#ifndef _MAX3107_H
-#define _MAX3107_H
-
-/* Serial error status definitions */
-#define MAX3107_PARITY_ERROR 1
-#define MAX3107_FRAME_ERROR 2
-#define MAX3107_OVERRUN_ERROR 4
-#define MAX3107_ALL_ERRORS (MAX3107_PARITY_ERROR | \
- MAX3107_FRAME_ERROR | \
- MAX3107_OVERRUN_ERROR)
-
-/* GPIO definitions */
-#define MAX3107_GPIO_BASE 88
-#define MAX3107_GPIO_COUNT 4
-
-
-/* GPIO connected to chip's reset pin */
-#define MAX3107_RESET_GPIO 87
-
-
-/* Chip reset delay */
-#define MAX3107_RESET_DELAY 10
-
-/* Chip wakeup delay */
-#define MAX3107_WAKEUP_DELAY 50
-
-
-/* Sleep mode definitions */
-#define MAX3107_DISABLE_FORCED_SLEEP 0
-#define MAX3107_ENABLE_FORCED_SLEEP 1
-#define MAX3107_DISABLE_AUTOSLEEP 2
-#define MAX3107_ENABLE_AUTOSLEEP 3
-
-
-/* Definitions for register access with SPI transfers
- *
- * SPI transfer format:
- *
- * Master to slave bits xzzzzzzzyyyyyyyy
- * Slave to master bits aaaaaaaabbbbbbbb
- *
- * where:
- * x = 0 for reads, 1 for writes
- * z = register address
- * y = new register value if write, 0 if read
- * a = unspecified
- * b = register value if read, unspecified if write
- */
-
-/* SPI speed */
-#define MAX3107_SPI_SPEED (3125000 * 2)
-
-/* Write bit */
-#define MAX3107_WRITE_BIT (1 << 15)
-
-/* SPI TX data mask */
-#define MAX3107_SPI_RX_DATA_MASK (0x00ff)
-
-/* SPI RX data mask */
-#define MAX3107_SPI_TX_DATA_MASK (0x00ff)
-
-/* Register access masks */
-#define MAX3107_RHR_REG (0x0000) /* RX FIFO */
-#define MAX3107_THR_REG (0x0000) /* TX FIFO */
-#define MAX3107_IRQEN_REG (0x0100) /* IRQ enable */
-#define MAX3107_IRQSTS_REG (0x0200) /* IRQ status */
-#define MAX3107_LSR_IRQEN_REG (0x0300) /* LSR IRQ enable */
-#define MAX3107_LSR_IRQSTS_REG (0x0400) /* LSR IRQ status */
-#define MAX3107_SPCHR_IRQEN_REG (0x0500) /* Special char IRQ enable */
-#define MAX3107_SPCHR_IRQSTS_REG (0x0600) /* Special char IRQ status */
-#define MAX3107_STS_IRQEN_REG (0x0700) /* Status IRQ enable */
-#define MAX3107_STS_IRQSTS_REG (0x0800) /* Status IRQ status */
-#define MAX3107_MODE1_REG (0x0900) /* MODE1 */
-#define MAX3107_MODE2_REG (0x0a00) /* MODE2 */
-#define MAX3107_LCR_REG (0x0b00) /* LCR */
-#define MAX3107_RXTO_REG (0x0c00) /* RX timeout */
-#define MAX3107_HDPIXDELAY_REG (0x0d00) /* Auto transceiver delays */
-#define MAX3107_IRDA_REG (0x0e00) /* IRDA settings */
-#define MAX3107_FLOWLVL_REG (0x0f00) /* Flow control levels */
-#define MAX3107_FIFOTRIGLVL_REG (0x1000) /* FIFO IRQ trigger levels */
-#define MAX3107_TXFIFOLVL_REG (0x1100) /* TX FIFO level */
-#define MAX3107_RXFIFOLVL_REG (0x1200) /* RX FIFO level */
-#define MAX3107_FLOWCTRL_REG (0x1300) /* Flow control */
-#define MAX3107_XON1_REG (0x1400) /* XON1 character */
-#define MAX3107_XON2_REG (0x1500) /* XON2 character */
-#define MAX3107_XOFF1_REG (0x1600) /* XOFF1 character */
-#define MAX3107_XOFF2_REG (0x1700) /* XOFF2 character */
-#define MAX3107_GPIOCFG_REG (0x1800) /* GPIO config */
-#define MAX3107_GPIODATA_REG (0x1900) /* GPIO data */
-#define MAX3107_PLLCFG_REG (0x1a00) /* PLL config */
-#define MAX3107_BRGCFG_REG (0x1b00) /* Baud rate generator conf */
-#define MAX3107_BRGDIVLSB_REG (0x1c00) /* Baud rate divisor LSB */
-#define MAX3107_BRGDIVMSB_REG (0x1d00) /* Baud rate divisor MSB */
-#define MAX3107_CLKSRC_REG (0x1e00) /* Clock source */
-#define MAX3107_REVID_REG (0x1f00) /* Revision identification */
-
-/* IRQ register bits */
-#define MAX3107_IRQ_LSR_BIT (1 << 0) /* LSR interrupt */
-#define MAX3107_IRQ_SPCHR_BIT (1 << 1) /* Special char interrupt */
-#define MAX3107_IRQ_STS_BIT (1 << 2) /* Status interrupt */
-#define MAX3107_IRQ_RXFIFO_BIT (1 << 3) /* RX FIFO interrupt */
-#define MAX3107_IRQ_TXFIFO_BIT (1 << 4) /* TX FIFO interrupt */
-#define MAX3107_IRQ_TXEMPTY_BIT (1 << 5) /* TX FIFO empty interrupt */
-#define MAX3107_IRQ_RXEMPTY_BIT (1 << 6) /* RX FIFO empty interrupt */
-#define MAX3107_IRQ_CTS_BIT (1 << 7) /* CTS interrupt */
-
-/* LSR register bits */
-#define MAX3107_LSR_RXTO_BIT (1 << 0) /* RX timeout */
-#define MAX3107_LSR_RXOVR_BIT (1 << 1) /* RX overrun */
-#define MAX3107_LSR_RXPAR_BIT (1 << 2) /* RX parity error */
-#define MAX3107_LSR_FRERR_BIT (1 << 3) /* Frame error */
-#define MAX3107_LSR_RXBRK_BIT (1 << 4) /* RX break */
-#define MAX3107_LSR_RXNOISE_BIT (1 << 5) /* RX noise */
-#define MAX3107_LSR_UNDEF6_BIT (1 << 6) /* Undefined/not used */
-#define MAX3107_LSR_CTS_BIT (1 << 7) /* CTS pin state */
-
-/* Special character register bits */
-#define MAX3107_SPCHR_XON1_BIT (1 << 0) /* XON1 character */
-#define MAX3107_SPCHR_XON2_BIT (1 << 1) /* XON2 character */
-#define MAX3107_SPCHR_XOFF1_BIT (1 << 2) /* XOFF1 character */
-#define MAX3107_SPCHR_XOFF2_BIT (1 << 3) /* XOFF2 character */
-#define MAX3107_SPCHR_BREAK_BIT (1 << 4) /* RX break */
-#define MAX3107_SPCHR_MULTIDROP_BIT (1 << 5) /* 9-bit multidrop addr char */
-#define MAX3107_SPCHR_UNDEF6_BIT (1 << 6) /* Undefined/not used */
-#define MAX3107_SPCHR_UNDEF7_BIT (1 << 7) /* Undefined/not used */
-
-/* Status register bits */
-#define MAX3107_STS_GPIO0_BIT (1 << 0) /* GPIO 0 interrupt */
-#define MAX3107_STS_GPIO1_BIT (1 << 1) /* GPIO 1 interrupt */
-#define MAX3107_STS_GPIO2_BIT (1 << 2) /* GPIO 2 interrupt */
-#define MAX3107_STS_GPIO3_BIT (1 << 3) /* GPIO 3 interrupt */
-#define MAX3107_STS_UNDEF4_BIT (1 << 4) /* Undefined/not used */
-#define MAX3107_STS_CLKREADY_BIT (1 << 5) /* Clock ready */
-#define MAX3107_STS_SLEEP_BIT (1 << 6) /* Sleep interrupt */
-#define MAX3107_STS_UNDEF7_BIT (1 << 7) /* Undefined/not used */
-
-/* MODE1 register bits */
-#define MAX3107_MODE1_RXDIS_BIT (1 << 0) /* RX disable */
-#define MAX3107_MODE1_TXDIS_BIT (1 << 1) /* TX disable */
-#define MAX3107_MODE1_TXHIZ_BIT (1 << 2) /* TX pin three-state */
-#define MAX3107_MODE1_RTSHIZ_BIT (1 << 3) /* RTS pin three-state */
-#define MAX3107_MODE1_TRNSCVCTRL_BIT (1 << 4) /* Transceiver ctrl enable */
-#define MAX3107_MODE1_FORCESLEEP_BIT (1 << 5) /* Force sleep mode */
-#define MAX3107_MODE1_AUTOSLEEP_BIT (1 << 6) /* Auto sleep enable */
-#define MAX3107_MODE1_IRQSEL_BIT (1 << 7) /* IRQ pin enable */
-
-/* MODE2 register bits */
-#define MAX3107_MODE2_RST_BIT (1 << 0) /* Chip reset */
-#define MAX3107_MODE2_FIFORST_BIT (1 << 1) /* FIFO reset */
-#define MAX3107_MODE2_RXTRIGINV_BIT (1 << 2) /* RX FIFO INT invert */
-#define MAX3107_MODE2_RXEMPTINV_BIT (1 << 3) /* RX FIFO empty INT invert */
-#define MAX3107_MODE2_SPCHR_BIT (1 << 4) /* Special chr detect enable */
-#define MAX3107_MODE2_LOOPBACK_BIT (1 << 5) /* Internal loopback enable */
-#define MAX3107_MODE2_MULTIDROP_BIT (1 << 6) /* 9-bit multidrop enable */
-#define MAX3107_MODE2_ECHOSUPR_BIT (1 << 7) /* ECHO suppression enable */
-
-/* LCR register bits */
-#define MAX3107_LCR_LENGTH0_BIT (1 << 0) /* Word length bit 0 */
-#define MAX3107_LCR_LENGTH1_BIT (1 << 1) /* Word length bit 1
- *
- * Word length bits table:
- * 00 -> 5 bit words
- * 01 -> 6 bit words
- * 10 -> 7 bit words
- * 11 -> 8 bit words
- */
-#define MAX3107_LCR_STOPLEN_BIT (1 << 2) /* STOP length bit
- *
- * STOP length bit table:
- * 0 -> 1 stop bit
- * 1 -> 1-1.5 stop bits if
- * word length is 5,
- * 2 stop bits otherwise
- */
-#define MAX3107_LCR_PARITY_BIT (1 << 3) /* Parity bit enable */
-#define MAX3107_LCR_EVENPARITY_BIT (1 << 4) /* Even parity bit enable */
-#define MAX3107_LCR_FORCEPARITY_BIT (1 << 5) /* 9-bit multidrop parity */
-#define MAX3107_LCR_TXBREAK_BIT (1 << 6) /* TX break enable */
-#define MAX3107_LCR_RTS_BIT (1 << 7) /* RTS pin control */
-#define MAX3107_LCR_WORD_LEN_5 (0x0000)
-#define MAX3107_LCR_WORD_LEN_6 (0x0001)
-#define MAX3107_LCR_WORD_LEN_7 (0x0002)
-#define MAX3107_LCR_WORD_LEN_8 (0x0003)
-
-
-/* IRDA register bits */
-#define MAX3107_IRDA_IRDAEN_BIT (1 << 0) /* IRDA mode enable */
-#define MAX3107_IRDA_SIR_BIT (1 << 1) /* SIR mode enable */
-#define MAX3107_IRDA_SHORTIR_BIT (1 << 2) /* Short SIR mode enable */
-#define MAX3107_IRDA_MIR_BIT (1 << 3) /* MIR mode enable */
-#define MAX3107_IRDA_RXINV_BIT (1 << 4) /* RX logic inversion enable */
-#define MAX3107_IRDA_TXINV_BIT (1 << 5) /* TX logic inversion enable */
-#define MAX3107_IRDA_UNDEF6_BIT (1 << 6) /* Undefined/not used */
-#define MAX3107_IRDA_UNDEF7_BIT (1 << 7) /* Undefined/not used */
-
-/* Flow control trigger level register masks */
-#define MAX3107_FLOWLVL_HALT_MASK (0x000f) /* Flow control halt level */
-#define MAX3107_FLOWLVL_RES_MASK (0x00f0) /* Flow control resume level */
-#define MAX3107_FLOWLVL_HALT(words) ((words/8) & 0x000f)
-#define MAX3107_FLOWLVL_RES(words) (((words/8) & 0x000f) << 4)
-
-/* FIFO interrupt trigger level register masks */
-#define MAX3107_FIFOTRIGLVL_TX_MASK (0x000f) /* TX FIFO trigger level */
-#define MAX3107_FIFOTRIGLVL_RX_MASK (0x00f0) /* RX FIFO trigger level */
-#define MAX3107_FIFOTRIGLVL_TX(words) ((words/8) & 0x000f)
-#define MAX3107_FIFOTRIGLVL_RX(words) (((words/8) & 0x000f) << 4)
-
-/* Flow control register bits */
-#define MAX3107_FLOWCTRL_AUTORTS_BIT (1 << 0) /* Auto RTS flow ctrl enable */
-#define MAX3107_FLOWCTRL_AUTOCTS_BIT (1 << 1) /* Auto CTS flow ctrl enable */
-#define MAX3107_FLOWCTRL_GPIADDR_BIT (1 << 2) /* Enables that GPIO inputs
- * are used in conjunction with
- * XOFF2 for definition of
- * special character */
-#define MAX3107_FLOWCTRL_SWFLOWEN_BIT (1 << 3) /* Auto SW flow ctrl enable */
-#define MAX3107_FLOWCTRL_SWFLOW0_BIT (1 << 4) /* SWFLOW bit 0 */
-#define MAX3107_FLOWCTRL_SWFLOW1_BIT (1 << 5) /* SWFLOW bit 1
- *
- * SWFLOW bits 1 & 0 table:
- * 00 -> no transmitter flow
- * control
- * 01 -> receiver compares
- * XON2 and XOFF2
- * and controls
- * transmitter
- * 10 -> receiver compares
- * XON1 and XOFF1
- * and controls
- * transmitter
- * 11 -> receiver compares
- * XON1, XON2, XOFF1 and
- * XOFF2 and controls
- * transmitter
- */
-#define MAX3107_FLOWCTRL_SWFLOW2_BIT (1 << 6) /* SWFLOW bit 2 */
-#define MAX3107_FLOWCTRL_SWFLOW3_BIT (1 << 7) /* SWFLOW bit 3
- *
- * SWFLOW bits 3 & 2 table:
- * 00 -> no received flow
- * control
- * 01 -> transmitter generates
- * XON2 and XOFF2
- * 10 -> transmitter generates
- * XON1 and XOFF1
- * 11 -> transmitter generates
- * XON1, XON2, XOFF1 and
- * XOFF2
- */
-
-/* GPIO configuration register bits */
-#define MAX3107_GPIOCFG_GP0OUT_BIT (1 << 0) /* GPIO 0 output enable */
-#define MAX3107_GPIOCFG_GP1OUT_BIT (1 << 1) /* GPIO 1 output enable */
-#define MAX3107_GPIOCFG_GP2OUT_BIT (1 << 2) /* GPIO 2 output enable */
-#define MAX3107_GPIOCFG_GP3OUT_BIT (1 << 3) /* GPIO 3 output enable */
-#define MAX3107_GPIOCFG_GP0OD_BIT (1 << 4) /* GPIO 0 open-drain enable */
-#define MAX3107_GPIOCFG_GP1OD_BIT (1 << 5) /* GPIO 1 open-drain enable */
-#define MAX3107_GPIOCFG_GP2OD_BIT (1 << 6) /* GPIO 2 open-drain enable */
-#define MAX3107_GPIOCFG_GP3OD_BIT (1 << 7) /* GPIO 3 open-drain enable */
-
-/* GPIO DATA register bits */
-#define MAX3107_GPIODATA_GP0OUT_BIT (1 << 0) /* GPIO 0 output value */
-#define MAX3107_GPIODATA_GP1OUT_BIT (1 << 1) /* GPIO 1 output value */
-#define MAX3107_GPIODATA_GP2OUT_BIT (1 << 2) /* GPIO 2 output value */
-#define MAX3107_GPIODATA_GP3OUT_BIT (1 << 3) /* GPIO 3 output value */
-#define MAX3107_GPIODATA_GP0IN_BIT (1 << 4) /* GPIO 0 input value */
-#define MAX3107_GPIODATA_GP1IN_BIT (1 << 5) /* GPIO 1 input value */
-#define MAX3107_GPIODATA_GP2IN_BIT (1 << 6) /* GPIO 2 input value */
-#define MAX3107_GPIODATA_GP3IN_BIT (1 << 7) /* GPIO 3 input value */
-
-/* PLL configuration register masks */
-#define MAX3107_PLLCFG_PREDIV_MASK (0x003f) /* PLL predivision value */
-#define MAX3107_PLLCFG_PLLFACTOR_MASK (0x00c0) /* PLL multiplication factor */
-
-/* Baud rate generator configuration register masks and bits */
-#define MAX3107_BRGCFG_FRACT_MASK (0x000f) /* Fractional portion of
- * Baud rate generator divisor
- */
-#define MAX3107_BRGCFG_2XMODE_BIT (1 << 4) /* Double baud rate */
-#define MAX3107_BRGCFG_4XMODE_BIT (1 << 5) /* Quadruple baud rate */
-#define MAX3107_BRGCFG_UNDEF6_BIT (1 << 6) /* Undefined/not used */
-#define MAX3107_BRGCFG_UNDEF7_BIT (1 << 7) /* Undefined/not used */
-
-/* Clock source register bits */
-#define MAX3107_CLKSRC_INTOSC_BIT (1 << 0) /* Internal osc enable */
-#define MAX3107_CLKSRC_CRYST_BIT (1 << 1) /* Crystal osc enable */
-#define MAX3107_CLKSRC_PLL_BIT (1 << 2) /* PLL enable */
-#define MAX3107_CLKSRC_PLLBYP_BIT (1 << 3) /* PLL bypass */
-#define MAX3107_CLKSRC_EXTCLK_BIT (1 << 4) /* External clock enable */
-#define MAX3107_CLKSRC_UNDEF5_BIT (1 << 5) /* Undefined/not used */
-#define MAX3107_CLKSRC_UNDEF6_BIT (1 << 6) /* Undefined/not used */
-#define MAX3107_CLKSRC_CLK2RTS_BIT (1 << 7) /* Baud clk to RTS pin */
-
-
-/* HW definitions */
-#define MAX3107_RX_FIFO_SIZE 128
-#define MAX3107_TX_FIFO_SIZE 128
-#define MAX3107_REVID1 0x00a0
-#define MAX3107_REVID2 0x00a1
-
-
-/* Baud rate generator configuration values for external clock 13MHz */
-#define MAX3107_BRG13_B300 (0x0A9400 | 0x05)
-#define MAX3107_BRG13_B600 (0x054A00 | 0x03)
-#define MAX3107_BRG13_B1200 (0x02A500 | 0x01)
-#define MAX3107_BRG13_B2400 (0x015200 | 0x09)
-#define MAX3107_BRG13_B4800 (0x00A900 | 0x04)
-#define MAX3107_BRG13_B9600 (0x005400 | 0x0A)
-#define MAX3107_BRG13_B19200 (0x002A00 | 0x05)
-#define MAX3107_BRG13_B38400 (0x001500 | 0x03)
-#define MAX3107_BRG13_B57600 (0x000E00 | 0x02)
-#define MAX3107_BRG13_B115200 (0x000700 | 0x01)
-#define MAX3107_BRG13_B230400 (0x000300 | 0x08)
-#define MAX3107_BRG13_B460800 (0x000100 | 0x0c)
-#define MAX3107_BRG13_B921600 (0x000100 | 0x1c)
-
-/* Baud rate generator configuration values for external clock 26MHz */
-#define MAX3107_BRG26_B300 (0x152800 | 0x0A)
-#define MAX3107_BRG26_B600 (0x0A9400 | 0x05)
-#define MAX3107_BRG26_B1200 (0x054A00 | 0x03)
-#define MAX3107_BRG26_B2400 (0x02A500 | 0x01)
-#define MAX3107_BRG26_B4800 (0x015200 | 0x09)
-#define MAX3107_BRG26_B9600 (0x00A900 | 0x04)
-#define MAX3107_BRG26_B19200 (0x005400 | 0x0A)
-#define MAX3107_BRG26_B38400 (0x002A00 | 0x05)
-#define MAX3107_BRG26_B57600 (0x001C00 | 0x03)
-#define MAX3107_BRG26_B115200 (0x000E00 | 0x02)
-#define MAX3107_BRG26_B230400 (0x000700 | 0x01)
-#define MAX3107_BRG26_B460800 (0x000300 | 0x08)
-#define MAX3107_BRG26_B921600 (0x000100 | 0x0C)
-
-/* Baud rate generator configuration values for internal clock */
-#define MAX3107_BRG13_IB300 (0x008000 | 0x00)
-#define MAX3107_BRG13_IB600 (0x004000 | 0x00)
-#define MAX3107_BRG13_IB1200 (0x002000 | 0x00)
-#define MAX3107_BRG13_IB2400 (0x001000 | 0x00)
-#define MAX3107_BRG13_IB4800 (0x000800 | 0x00)
-#define MAX3107_BRG13_IB9600 (0x000400 | 0x00)
-#define MAX3107_BRG13_IB19200 (0x000200 | 0x00)
-#define MAX3107_BRG13_IB38400 (0x000100 | 0x00)
-#define MAX3107_BRG13_IB57600 (0x000000 | 0x0B)
-#define MAX3107_BRG13_IB115200 (0x000000 | 0x05)
-#define MAX3107_BRG13_IB230400 (0x000000 | 0x03)
-#define MAX3107_BRG13_IB460800 (0x000000 | 0x00)
-#define MAX3107_BRG13_IB921600 (0x000000 | 0x00)
-
-
-struct baud_table {
- int baud;
- u32 new_brg;
-};
-
-struct max3107_port {
- /* UART port structure */
- struct uart_port port;
-
- /* SPI device structure */
- struct spi_device *spi;
-
-#if defined(CONFIG_GPIOLIB)
- /* GPIO chip structure */
- struct gpio_chip chip;
-#endif
-
- /* Workqueue that does all the magic */
- struct workqueue_struct *workqueue;
- struct work_struct work;
-
- /* Lock for shared data */
- spinlock_t data_lock;
-
- /* Device configuration */
- int ext_clk; /* 1 if external clock used */
- int loopback; /* Current loopback mode state */
- int baud; /* Current baud rate */
-
- /* State flags */
- int suspended; /* Indicates suspend mode */
- int tx_fifo_empty; /* Flag for TX FIFO state */
- int rx_enabled; /* Flag for receiver state */
- int tx_enabled; /* Flag for transmitter state */
-
- u16 irqen_reg; /* Current IRQ enable register value */
- /* Shared data */
- u16 mode1_reg; /* Current mode1 register value*/
- int mode1_commit; /* Flag for setting new mode1 register value */
- u16 lcr_reg; /* Current LCR register value */
- int lcr_commit; /* Flag for setting new LCR register value */
- u32 brg_cfg; /* Current Baud rate generator config */
- int brg_commit; /* Flag for setting new baud rate generator
- * config
- */
- struct baud_table *baud_tbl;
- int handle_irq; /* Indicates that IRQ should be handled */
-
- /* Rx buffer and str*/
- u16 *rxbuf;
- u8 *rxstr;
- /* Tx buffer*/
- u16 *txbuf;
-
- struct max3107_plat *pdata; /* Platform data */
-};
-
-/* Platform data structure */
-struct max3107_plat {
- /* Loopback mode enable */
- int loopback;
- /* External clock enable */
- int ext_clk;
- /* Called during the register initialisation */
- void (*init)(struct max3107_port *s);
- /* Called when the port is found and configured */
- int (*configure)(struct max3107_port *s);
- /* HW suspend function */
- void (*hw_suspend) (struct max3107_port *s, int suspend);
- /* Polling mode enable */
- int polled_mode;
- /* Polling period if polling mode enabled */
- int poll_time;
-};
-
-extern int max3107_rw(struct max3107_port *s, u8 *tx, u8 *rx, int len);
-extern void max3107_hw_susp(struct max3107_port *s, int suspend);
-extern int max3107_probe(struct spi_device *spi, struct max3107_plat *pdata);
-extern int max3107_remove(struct spi_device *spi);
-extern int max3107_suspend(struct spi_device *spi, pm_message_t state);
-extern int max3107_resume(struct spi_device *spi);
-
-#endif /* _LINUX_SERIAL_MAX3107_H */
--- /dev/null
+/*
+ * Maxim (Dallas) MAX3107/8 serial driver
+ *
+ * Copyright (C) 2012 Alexander Shiyan <shc_work@mail.ru>
+ *
+ * Based on max3100.c, by Christian Pellegrin <chripell@evolware.org>
+ * Based on max3110.c, by Feng Tang <feng.tang@intel.com>
+ * Based on max3107.c, by Aavamobile
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+/* TODO: MAX3109 support (Dual) */
+/* TODO: MAX14830 support (Quad) */
+
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/serial_core.h>
+#include <linux/serial.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/regmap.h>
+#include <linux/gpio.h>
+#include <linux/spi/spi.h>
+#include <linux/platform_data/max310x.h>
+
+#define MAX310X_MAJOR 204
+#define MAX310X_MINOR 209
+
+/* MAX310X register definitions */
+#define MAX310X_RHR_REG (0x00) /* RX FIFO */
+#define MAX310X_THR_REG (0x00) /* TX FIFO */
+#define MAX310X_IRQEN_REG (0x01) /* IRQ enable */
+#define MAX310X_IRQSTS_REG (0x02) /* IRQ status */
+#define MAX310X_LSR_IRQEN_REG (0x03) /* LSR IRQ enable */
+#define MAX310X_LSR_IRQSTS_REG (0x04) /* LSR IRQ status */
+#define MAX310X_SPCHR_IRQEN_REG (0x05) /* Special char IRQ enable */
+#define MAX310X_SPCHR_IRQSTS_REG (0x06) /* Special char IRQ status */
+#define MAX310X_STS_IRQEN_REG (0x07) /* Status IRQ enable */
+#define MAX310X_STS_IRQSTS_REG (0x08) /* Status IRQ status */
+#define MAX310X_MODE1_REG (0x09) /* MODE1 */
+#define MAX310X_MODE2_REG (0x0a) /* MODE2 */
+#define MAX310X_LCR_REG (0x0b) /* LCR */
+#define MAX310X_RXTO_REG (0x0c) /* RX timeout */
+#define MAX310X_HDPIXDELAY_REG (0x0d) /* Auto transceiver delays */
+#define MAX310X_IRDA_REG (0x0e) /* IRDA settings */
+#define MAX310X_FLOWLVL_REG (0x0f) /* Flow control levels */
+#define MAX310X_FIFOTRIGLVL_REG (0x10) /* FIFO IRQ trigger levels */
+#define MAX310X_TXFIFOLVL_REG (0x11) /* TX FIFO level */
+#define MAX310X_RXFIFOLVL_REG (0x12) /* RX FIFO level */
+#define MAX310X_FLOWCTRL_REG (0x13) /* Flow control */
+#define MAX310X_XON1_REG (0x14) /* XON1 character */
+#define MAX310X_XON2_REG (0x15) /* XON2 character */
+#define MAX310X_XOFF1_REG (0x16) /* XOFF1 character */
+#define MAX310X_XOFF2_REG (0x17) /* XOFF2 character */
+#define MAX310X_GPIOCFG_REG (0x18) /* GPIO config */
+#define MAX310X_GPIODATA_REG (0x19) /* GPIO data */
+#define MAX310X_PLLCFG_REG (0x1a) /* PLL config */
+#define MAX310X_BRGCFG_REG (0x1b) /* Baud rate generator conf */
+#define MAX310X_BRGDIVLSB_REG (0x1c) /* Baud rate divisor LSB */
+#define MAX310X_BRGDIVMSB_REG (0x1d) /* Baud rate divisor MSB */
+#define MAX310X_CLKSRC_REG (0x1e) /* Clock source */
+/* Only present in MAX3107 */
+#define MAX3107_REVID_REG (0x1f) /* Revision identification */
+
+/* IRQ register bits */
+#define MAX310X_IRQ_LSR_BIT (1 << 0) /* LSR interrupt */
+#define MAX310X_IRQ_SPCHR_BIT (1 << 1) /* Special char interrupt */
+#define MAX310X_IRQ_STS_BIT (1 << 2) /* Status interrupt */
+#define MAX310X_IRQ_RXFIFO_BIT (1 << 3) /* RX FIFO interrupt */
+#define MAX310X_IRQ_TXFIFO_BIT (1 << 4) /* TX FIFO interrupt */
+#define MAX310X_IRQ_TXEMPTY_BIT (1 << 5) /* TX FIFO empty interrupt */
+#define MAX310X_IRQ_RXEMPTY_BIT (1 << 6) /* RX FIFO empty interrupt */
+#define MAX310X_IRQ_CTS_BIT (1 << 7) /* CTS interrupt */
+
+/* LSR register bits */
+#define MAX310X_LSR_RXTO_BIT (1 << 0) /* RX timeout */
+#define MAX310X_LSR_RXOVR_BIT (1 << 1) /* RX overrun */
+#define MAX310X_LSR_RXPAR_BIT (1 << 2) /* RX parity error */
+#define MAX310X_LSR_FRERR_BIT (1 << 3) /* Frame error */
+#define MAX310X_LSR_RXBRK_BIT (1 << 4) /* RX break */
+#define MAX310X_LSR_RXNOISE_BIT (1 << 5) /* RX noise */
+#define MAX310X_LSR_CTS_BIT (1 << 7) /* CTS pin state */
+
+/* Special character register bits */
+#define MAX310X_SPCHR_XON1_BIT (1 << 0) /* XON1 character */
+#define MAX310X_SPCHR_XON2_BIT (1 << 1) /* XON2 character */
+#define MAX310X_SPCHR_XOFF1_BIT (1 << 2) /* XOFF1 character */
+#define MAX310X_SPCHR_XOFF2_BIT (1 << 3) /* XOFF2 character */
+#define MAX310X_SPCHR_BREAK_BIT (1 << 4) /* RX break */
+#define MAX310X_SPCHR_MULTIDROP_BIT (1 << 5) /* 9-bit multidrop addr char */
+
+/* Status register bits */
+#define MAX310X_STS_GPIO0_BIT (1 << 0) /* GPIO 0 interrupt */
+#define MAX310X_STS_GPIO1_BIT (1 << 1) /* GPIO 1 interrupt */
+#define MAX310X_STS_GPIO2_BIT (1 << 2) /* GPIO 2 interrupt */
+#define MAX310X_STS_GPIO3_BIT (1 << 3) /* GPIO 3 interrupt */
+#define MAX310X_STS_CLKREADY_BIT (1 << 5) /* Clock ready */
+#define MAX310X_STS_SLEEP_BIT (1 << 6) /* Sleep interrupt */
+
+/* MODE1 register bits */
+#define MAX310X_MODE1_RXDIS_BIT (1 << 0) /* RX disable */
+#define MAX310X_MODE1_TXDIS_BIT (1 << 1) /* TX disable */
+#define MAX310X_MODE1_TXHIZ_BIT (1 << 2) /* TX pin three-state */
+#define MAX310X_MODE1_RTSHIZ_BIT (1 << 3) /* RTS pin three-state */
+#define MAX310X_MODE1_TRNSCVCTRL_BIT (1 << 4) /* Transceiver ctrl enable */
+#define MAX310X_MODE1_FORCESLEEP_BIT (1 << 5) /* Force sleep mode */
+#define MAX310X_MODE1_AUTOSLEEP_BIT (1 << 6) /* Auto sleep enable */
+#define MAX310X_MODE1_IRQSEL_BIT (1 << 7) /* IRQ pin enable */
+
+/* MODE2 register bits */
+#define MAX310X_MODE2_RST_BIT (1 << 0) /* Chip reset */
+#define MAX310X_MODE2_FIFORST_BIT (1 << 1) /* FIFO reset */
+#define MAX310X_MODE2_RXTRIGINV_BIT (1 << 2) /* RX FIFO INT invert */
+#define MAX310X_MODE2_RXEMPTINV_BIT (1 << 3) /* RX FIFO empty INT invert */
+#define MAX310X_MODE2_SPCHR_BIT (1 << 4) /* Special chr detect enable */
+#define MAX310X_MODE2_LOOPBACK_BIT (1 << 5) /* Internal loopback enable */
+#define MAX310X_MODE2_MULTIDROP_BIT (1 << 6) /* 9-bit multidrop enable */
+#define MAX310X_MODE2_ECHOSUPR_BIT (1 << 7) /* ECHO suppression enable */
+
+/* LCR register bits */
+#define MAX310X_LCR_LENGTH0_BIT (1 << 0) /* Word length bit 0 */
+#define MAX310X_LCR_LENGTH1_BIT (1 << 1) /* Word length bit 1
+ *
+ * Word length bits table:
+ * 00 -> 5 bit words
+ * 01 -> 6 bit words
+ * 10 -> 7 bit words
+ * 11 -> 8 bit words
+ */
+#define MAX310X_LCR_STOPLEN_BIT (1 << 2) /* STOP length bit
+ *
+ * STOP length bit table:
+ * 0 -> 1 stop bit
+ * 1 -> 1-1.5 stop bits if
+ * word length is 5,
+ * 2 stop bits otherwise
+ */
+#define MAX310X_LCR_PARITY_BIT (1 << 3) /* Parity bit enable */
+#define MAX310X_LCR_EVENPARITY_BIT (1 << 4) /* Even parity bit enable */
+#define MAX310X_LCR_FORCEPARITY_BIT (1 << 5) /* 9-bit multidrop parity */
+#define MAX310X_LCR_TXBREAK_BIT (1 << 6) /* TX break enable */
+#define MAX310X_LCR_RTS_BIT (1 << 7) /* RTS pin control */
+#define MAX310X_LCR_WORD_LEN_5 (0x00)
+#define MAX310X_LCR_WORD_LEN_6 (0x01)
+#define MAX310X_LCR_WORD_LEN_7 (0x02)
+#define MAX310X_LCR_WORD_LEN_8 (0x03)
+
+/* IRDA register bits */
+#define MAX310X_IRDA_IRDAEN_BIT (1 << 0) /* IRDA mode enable */
+#define MAX310X_IRDA_SIR_BIT (1 << 1) /* SIR mode enable */
+#define MAX310X_IRDA_SHORTIR_BIT (1 << 2) /* Short SIR mode enable */
+#define MAX310X_IRDA_MIR_BIT (1 << 3) /* MIR mode enable */
+#define MAX310X_IRDA_RXINV_BIT (1 << 4) /* RX logic inversion enable */
+#define MAX310X_IRDA_TXINV_BIT (1 << 5) /* TX logic inversion enable */
+
+/* Flow control trigger level register masks */
+#define MAX310X_FLOWLVL_HALT_MASK (0x000f) /* Flow control halt level */
+#define MAX310X_FLOWLVL_RES_MASK (0x00f0) /* Flow control resume level */
+#define MAX310X_FLOWLVL_HALT(words) ((words / 8) & 0x0f)
+#define MAX310X_FLOWLVL_RES(words) (((words / 8) & 0x0f) << 4)
+
+/* FIFO interrupt trigger level register masks */
+#define MAX310X_FIFOTRIGLVL_TX_MASK (0x0f) /* TX FIFO trigger level */
+#define MAX310X_FIFOTRIGLVL_RX_MASK (0xf0) /* RX FIFO trigger level */
+#define MAX310X_FIFOTRIGLVL_TX(words) ((words / 8) & 0x0f)
+#define MAX310X_FIFOTRIGLVL_RX(words) (((words / 8) & 0x0f) << 4)
+
+/* Flow control register bits */
+#define MAX310X_FLOWCTRL_AUTORTS_BIT (1 << 0) /* Auto RTS flow ctrl enable */
+#define MAX310X_FLOWCTRL_AUTOCTS_BIT (1 << 1) /* Auto CTS flow ctrl enable */
+#define MAX310X_FLOWCTRL_GPIADDR_BIT (1 << 2) /* Enables that GPIO inputs
+ * are used in conjunction with
+ * XOFF2 for definition of
+ * special character */
+#define MAX310X_FLOWCTRL_SWFLOWEN_BIT (1 << 3) /* Auto SW flow ctrl enable */
+#define MAX310X_FLOWCTRL_SWFLOW0_BIT (1 << 4) /* SWFLOW bit 0 */
+#define MAX310X_FLOWCTRL_SWFLOW1_BIT (1 << 5) /* SWFLOW bit 1
+ *
+ * SWFLOW bits 1 & 0 table:
+ * 00 -> no transmitter flow
+ * control
+ * 01 -> receiver compares
+ * XON2 and XOFF2
+ * and controls
+ * transmitter
+ * 10 -> receiver compares
+ * XON1 and XOFF1
+ * and controls
+ * transmitter
+ * 11 -> receiver compares
+ * XON1, XON2, XOFF1 and
+ * XOFF2 and controls
+ * transmitter
+ */
+#define MAX310X_FLOWCTRL_SWFLOW2_BIT (1 << 6) /* SWFLOW bit 2 */
+#define MAX310X_FLOWCTRL_SWFLOW3_BIT (1 << 7) /* SWFLOW bit 3
+ *
+ * SWFLOW bits 3 & 2 table:
+ * 00 -> no received flow
+ * control
+ * 01 -> transmitter generates
+ * XON2 and XOFF2
+ * 10 -> transmitter generates
+ * XON1 and XOFF1
+ * 11 -> transmitter generates
+ * XON1, XON2, XOFF1 and
+ * XOFF2
+ */
+
+/* GPIO configuration register bits */
+#define MAX310X_GPIOCFG_GP0OUT_BIT (1 << 0) /* GPIO 0 output enable */
+#define MAX310X_GPIOCFG_GP1OUT_BIT (1 << 1) /* GPIO 1 output enable */
+#define MAX310X_GPIOCFG_GP2OUT_BIT (1 << 2) /* GPIO 2 output enable */
+#define MAX310X_GPIOCFG_GP3OUT_BIT (1 << 3) /* GPIO 3 output enable */
+#define MAX310X_GPIOCFG_GP0OD_BIT (1 << 4) /* GPIO 0 open-drain enable */
+#define MAX310X_GPIOCFG_GP1OD_BIT (1 << 5) /* GPIO 1 open-drain enable */
+#define MAX310X_GPIOCFG_GP2OD_BIT (1 << 6) /* GPIO 2 open-drain enable */
+#define MAX310X_GPIOCFG_GP3OD_BIT (1 << 7) /* GPIO 3 open-drain enable */
+
+/* GPIO DATA register bits */
+#define MAX310X_GPIODATA_GP0OUT_BIT (1 << 0) /* GPIO 0 output value */
+#define MAX310X_GPIODATA_GP1OUT_BIT (1 << 1) /* GPIO 1 output value */
+#define MAX310X_GPIODATA_GP2OUT_BIT (1 << 2) /* GPIO 2 output value */
+#define MAX310X_GPIODATA_GP3OUT_BIT (1 << 3) /* GPIO 3 output value */
+#define MAX310X_GPIODATA_GP0IN_BIT (1 << 4) /* GPIO 0 input value */
+#define MAX310X_GPIODATA_GP1IN_BIT (1 << 5) /* GPIO 1 input value */
+#define MAX310X_GPIODATA_GP2IN_BIT (1 << 6) /* GPIO 2 input value */
+#define MAX310X_GPIODATA_GP3IN_BIT (1 << 7) /* GPIO 3 input value */
+
+/* PLL configuration register masks */
+#define MAX310X_PLLCFG_PREDIV_MASK (0x3f) /* PLL predivision value */
+#define MAX310X_PLLCFG_PLLFACTOR_MASK (0xc0) /* PLL multiplication factor */
+
+/* Baud rate generator configuration register bits */
+#define MAX310X_BRGCFG_2XMODE_BIT (1 << 4) /* Double baud rate */
+#define MAX310X_BRGCFG_4XMODE_BIT (1 << 5) /* Quadruple baud rate */
+
+/* Clock source register bits */
+#define MAX310X_CLKSRC_CRYST_BIT (1 << 1) /* Crystal osc enable */
+#define MAX310X_CLKSRC_PLL_BIT (1 << 2) /* PLL enable */
+#define MAX310X_CLKSRC_PLLBYP_BIT (1 << 3) /* PLL bypass */
+#define MAX310X_CLKSRC_EXTCLK_BIT (1 << 4) /* External clock enable */
+#define MAX310X_CLKSRC_CLK2RTS_BIT (1 << 7) /* Baud clk to RTS pin */
+
+/* Misc definitions */
+#define MAX310X_FIFO_SIZE (128)
+
+/* MAX3107 specific */
+#define MAX3107_REV_ID (0xa0)
+#define MAX3107_REV_MASK (0xfe)
+
+/* IRQ status bits definitions */
+#define MAX310X_IRQ_TX (MAX310X_IRQ_TXFIFO_BIT | \
+ MAX310X_IRQ_TXEMPTY_BIT)
+#define MAX310X_IRQ_RX (MAX310X_IRQ_RXFIFO_BIT | \
+ MAX310X_IRQ_RXEMPTY_BIT)
+
+/* Supported chip types */
+enum {
+ MAX310X_TYPE_MAX3107 = 3107,
+ MAX310X_TYPE_MAX3108 = 3108,
+};
+
+struct max310x_port {
+ struct uart_driver uart;
+ struct uart_port port;
+
+ const char *name;
+ int uartclk;
+
+ unsigned int nr_gpio;
+#ifdef CONFIG_GPIOLIB
+ struct gpio_chip gpio;
+#endif
+
+ struct regmap *regmap;
+ struct regmap_config regcfg;
+
+ struct workqueue_struct *wq;
+ struct work_struct tx_work;
+
+ struct mutex max310x_mutex;
+
+ struct max310x_pdata *pdata;
+};
+
+static bool max3107_8_reg_writeable(struct device *dev, unsigned int reg)
+{
+ switch (reg) {
+ case MAX310X_IRQSTS_REG:
+ case MAX310X_LSR_IRQSTS_REG:
+ case MAX310X_SPCHR_IRQSTS_REG:
+ case MAX310X_STS_IRQSTS_REG:
+ case MAX310X_TXFIFOLVL_REG:
+ case MAX310X_RXFIFOLVL_REG:
+ case MAX3107_REVID_REG: /* Only available on MAX3107 */
+ return false;
+ default:
+ break;
+ }
+
+ return true;
+}
+
+static bool max310x_reg_volatile(struct device *dev, unsigned int reg)
+{
+ switch (reg) {
+ case MAX310X_RHR_REG:
+ case MAX310X_IRQSTS_REG:
+ case MAX310X_LSR_IRQSTS_REG:
+ case MAX310X_SPCHR_IRQSTS_REG:
+ case MAX310X_STS_IRQSTS_REG:
+ case MAX310X_TXFIFOLVL_REG:
+ case MAX310X_RXFIFOLVL_REG:
+ case MAX310X_GPIODATA_REG:
+ return true;
+ default:
+ break;
+ }
+
+ return false;
+}
+
+static bool max310x_reg_precious(struct device *dev, unsigned int reg)
+{
+ switch (reg) {
+ case MAX310X_RHR_REG:
+ case MAX310X_IRQSTS_REG:
+ case MAX310X_SPCHR_IRQSTS_REG:
+ case MAX310X_STS_IRQSTS_REG:
+ return true;
+ default:
+ break;
+ }
+
+ return false;
+}
+
+static void max310x_set_baud(struct max310x_port *s, int baud)
+{
+ unsigned int mode = 0, div = s->uartclk / baud;
+
+ if (!(div / 16)) {
+ /* Mode x2 */
+ mode = MAX310X_BRGCFG_2XMODE_BIT;
+ div = (s->uartclk * 2) / baud;
+ }
+
+ if (!(div / 16)) {
+ /* Mode x4 */
+ mode = MAX310X_BRGCFG_4XMODE_BIT;
+ div = (s->uartclk * 4) / baud;
+ }
+
+ regmap_write(s->regmap, MAX310X_BRGDIVMSB_REG,
+ ((div / 16) >> 8) & 0xff);
+ regmap_write(s->regmap, MAX310X_BRGDIVLSB_REG, (div / 16) & 0xff);
+ regmap_write(s->regmap, MAX310X_BRGCFG_REG, (div % 16) | mode);
+}
+
+static void max310x_wait_pll(struct max310x_port *s)
+{
+ int tryes = 1000;
+
+ /* Wait for PLL only if crystal is used */
+ if (!(s->pdata->driver_flags & MAX310X_EXT_CLK)) {
+ unsigned int sts = 0;
+
+ while (tryes--) {
+ regmap_read(s->regmap, MAX310X_STS_IRQSTS_REG, &sts);
+ if (sts & MAX310X_STS_CLKREADY_BIT)
+ break;
+ }
+ }
+}
+
+static int __devinit max310x_update_best_err(unsigned long f, long *besterr)
+{
+ /* Use baudrate 115200 for calculate error */
+ long err = f % (115200 * 16);
+
+ if ((*besterr < 0) || (*besterr > err)) {
+ *besterr = err;
+ return 0;
+ }
+
+ return 1;
+}
+
+static int __devinit max310x_set_ref_clk(struct max310x_port *s)
+{
+ unsigned int div, clksrc, pllcfg = 0;
+ long besterr = -1;
+ unsigned long fdiv, fmul, bestfreq = s->pdata->frequency;
+
+ /* First, update error without PLL */
+ max310x_update_best_err(s->pdata->frequency, &besterr);
+
+ /* Try all possible PLL dividers */
+ for (div = 1; (div <= 63) && besterr; div++) {
+ fdiv = DIV_ROUND_CLOSEST(s->pdata->frequency, div);
+
+ /* Try multiplier 6 */
+ fmul = fdiv * 6;
+ if ((fdiv >= 500000) && (fdiv <= 800000))
+ if (!max310x_update_best_err(fmul, &besterr)) {
+ pllcfg = (0 << 6) | div;
+ bestfreq = fmul;
+ }
+ /* Try multiplier 48 */
+ fmul = fdiv * 48;
+ if ((fdiv >= 850000) && (fdiv <= 1200000))
+ if (!max310x_update_best_err(fmul, &besterr)) {
+ pllcfg = (1 << 6) | div;
+ bestfreq = fmul;
+ }
+ /* Try multiplier 96 */
+ fmul = fdiv * 96;
+ if ((fdiv >= 425000) && (fdiv <= 1000000))
+ if (!max310x_update_best_err(fmul, &besterr)) {
+ pllcfg = (2 << 6) | div;
+ bestfreq = fmul;
+ }
+ /* Try multiplier 144 */
+ fmul = fdiv * 144;
+ if ((fdiv >= 390000) && (fdiv <= 667000))
+ if (!max310x_update_best_err(fmul, &besterr)) {
+ pllcfg = (3 << 6) | div;
+ bestfreq = fmul;
+ }
+ }
+
+ /* Configure clock source */
+ if (s->pdata->driver_flags & MAX310X_EXT_CLK)
+ clksrc = MAX310X_CLKSRC_EXTCLK_BIT;
+ else
+ clksrc = MAX310X_CLKSRC_CRYST_BIT;
+
+ /* Configure PLL */
+ if (pllcfg) {
+ clksrc |= MAX310X_CLKSRC_PLL_BIT;
+ regmap_write(s->regmap, MAX310X_PLLCFG_REG, pllcfg);
+ } else
+ clksrc |= MAX310X_CLKSRC_PLLBYP_BIT;
+
+ regmap_write(s->regmap, MAX310X_CLKSRC_REG, clksrc);
+
+ if (pllcfg)
+ max310x_wait_pll(s);
+
+ dev_dbg(s->port.dev, "Reference clock set to %lu Hz\n", bestfreq);
+
+ return (int)bestfreq;
+}
+
+static void max310x_handle_rx(struct max310x_port *s, unsigned int rxlen)
+{
+ unsigned int sts = 0, ch = 0, flag;
+ struct tty_struct *tty = tty_port_tty_get(&s->port.state->port);
+
+ if (!tty)
+ return;
+
+ if (unlikely(rxlen >= MAX310X_FIFO_SIZE)) {
+ dev_warn(s->port.dev, "Possible RX FIFO overrun %d\n", rxlen);
+ /* Ensure sanity of RX level */
+ rxlen = MAX310X_FIFO_SIZE;
+ }
+
+ dev_dbg(s->port.dev, "RX Len = %u\n", rxlen);
+
+ while (rxlen--) {
+ regmap_read(s->regmap, MAX310X_RHR_REG, &ch);
+ regmap_read(s->regmap, MAX310X_LSR_IRQSTS_REG, &sts);
+
+ sts &= MAX310X_LSR_RXPAR_BIT | MAX310X_LSR_FRERR_BIT |
+ MAX310X_LSR_RXOVR_BIT | MAX310X_LSR_RXBRK_BIT;
+
+ s->port.icount.rx++;
+ flag = TTY_NORMAL;
+
+ if (unlikely(sts)) {
+ if (sts & MAX310X_LSR_RXBRK_BIT) {
+ s->port.icount.brk++;
+ if (uart_handle_break(&s->port))
+ continue;
+ } else if (sts & MAX310X_LSR_RXPAR_BIT)
+ s->port.icount.parity++;
+ else if (sts & MAX310X_LSR_FRERR_BIT)
+ s->port.icount.frame++;
+ else if (sts & MAX310X_LSR_RXOVR_BIT)
+ s->port.icount.overrun++;
+
+ sts &= s->port.read_status_mask;
+ if (sts & MAX310X_LSR_RXBRK_BIT)
+ flag = TTY_BREAK;
+ else if (sts & MAX310X_LSR_RXPAR_BIT)
+ flag = TTY_PARITY;
+ else if (sts & MAX310X_LSR_FRERR_BIT)
+ flag = TTY_FRAME;
+ else if (sts & MAX310X_LSR_RXOVR_BIT)
+ flag = TTY_OVERRUN;
+ }
+
+ if (uart_handle_sysrq_char(s->port, ch))
+ continue;
+
+ if (sts & s->port.ignore_status_mask)
+ continue;
+
+ uart_insert_char(&s->port, sts, MAX310X_LSR_RXOVR_BIT,
+ ch, flag);
+ }
+
+ tty_flip_buffer_push(tty);
+
+ tty_kref_put(tty);
+}
+
+static void max310x_handle_tx(struct max310x_port *s)
+{
+ struct circ_buf *xmit = &s->port.state->xmit;
+ unsigned int txlen = 0, to_send;
+
+ if (unlikely(s->port.x_char)) {
+ regmap_write(s->regmap, MAX310X_THR_REG, s->port.x_char);
+ s->port.icount.tx++;
+ s->port.x_char = 0;
+ return;
+ }
+
+ if (uart_circ_empty(xmit) || uart_tx_stopped(&s->port))
+ return;
+
+ /* Get length of data pending in circular buffer */
+ to_send = uart_circ_chars_pending(xmit);
+ if (likely(to_send)) {
+ /* Limit to size of TX FIFO */
+ regmap_read(s->regmap, MAX310X_TXFIFOLVL_REG, &txlen);
+ txlen = MAX310X_FIFO_SIZE - txlen;
+ to_send = (to_send > txlen) ? txlen : to_send;
+
+ dev_dbg(s->port.dev, "TX Len = %u\n", to_send);
+
+ /* Add data to send */
+ s->port.icount.tx += to_send;
+ while (to_send--) {
+ regmap_write(s->regmap, MAX310X_THR_REG,
+ xmit->buf[xmit->tail]);
+ xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
+ };
+ }
+
+ if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+ uart_write_wakeup(&s->port);
+}
+
+static irqreturn_t max310x_ist(int irq, void *dev_id)
+{
+ struct max310x_port *s = (struct max310x_port *)dev_id;
+ unsigned int ists = 0, lsr = 0, rxlen = 0;
+
+ mutex_lock(&s->max310x_mutex);
+
+ for (;;) {
+ /* Read IRQ status & RX FIFO level */
+ regmap_read(s->regmap, MAX310X_IRQSTS_REG, &ists);
+ regmap_read(s->regmap, MAX310X_LSR_IRQSTS_REG, &lsr);
+ regmap_read(s->regmap, MAX310X_RXFIFOLVL_REG, &rxlen);
+ if (!ists && !(lsr & MAX310X_LSR_RXTO_BIT) && !rxlen)
+ break;
+
+ dev_dbg(s->port.dev, "IRQ status: 0x%02x\n", ists);
+
+ if (rxlen)
+ max310x_handle_rx(s, rxlen);
+ if (ists & MAX310X_IRQ_TX)
+ max310x_handle_tx(s);
+ if (ists & MAX310X_IRQ_CTS_BIT)
+ uart_handle_cts_change(&s->port,
+ !!(lsr & MAX310X_LSR_CTS_BIT));
+ }
+
+ mutex_unlock(&s->max310x_mutex);
+
+ return IRQ_HANDLED;
+}
+
+static void max310x_wq_proc(struct work_struct *ws)
+{
+ struct max310x_port *s = container_of(ws, struct max310x_port, tx_work);
+
+ mutex_lock(&s->max310x_mutex);
+ max310x_handle_tx(s);
+ mutex_unlock(&s->max310x_mutex);
+}
+
+static void max310x_start_tx(struct uart_port *port)
+{
+ struct max310x_port *s = container_of(port, struct max310x_port, port);
+
+ queue_work(s->wq, &s->tx_work);
+}
+
+static void max310x_stop_tx(struct uart_port *port)
+{
+ /* Do nothing */
+}
+
+static void max310x_stop_rx(struct uart_port *port)
+{
+ /* Do nothing */
+}
+
+static unsigned int max310x_tx_empty(struct uart_port *port)
+{
+ unsigned int val = 0;
+ struct max310x_port *s = container_of(port, struct max310x_port, port);
+
+ mutex_lock(&s->max310x_mutex);
+ regmap_read(s->regmap, MAX310X_TXFIFOLVL_REG, &val);
+ mutex_unlock(&s->max310x_mutex);
+
+ return val ? 0 : TIOCSER_TEMT;
+}
+
+static void max310x_enable_ms(struct uart_port *port)
+{
+ /* Modem status not supported */
+}
+
+static unsigned int max310x_get_mctrl(struct uart_port *port)
+{
+ /* DCD and DSR are not wired and CTS/RTS is handled automatically
+ * so just indicate DSR and CAR asserted
+ */
+ return TIOCM_DSR | TIOCM_CAR;
+}
+
+static void max310x_set_mctrl(struct uart_port *port, unsigned int mctrl)
+{
+ /* DCD and DSR are not wired and CTS/RTS is hadnled automatically
+ * so do nothing
+ */
+}
+
+static void max310x_break_ctl(struct uart_port *port, int break_state)
+{
+ struct max310x_port *s = container_of(port, struct max310x_port, port);
+
+ mutex_lock(&s->max310x_mutex);
+ regmap_update_bits(s->regmap, MAX310X_LCR_REG,
+ MAX310X_LCR_TXBREAK_BIT,
+ break_state ? MAX310X_LCR_TXBREAK_BIT : 0);
+ mutex_unlock(&s->max310x_mutex);
+}
+
+static void max310x_set_termios(struct uart_port *port,
+ struct ktermios *termios,
+ struct ktermios *old)
+{
+ struct max310x_port *s = container_of(port, struct max310x_port, port);
+ unsigned int lcr, flow = 0;
+ int baud;
+
+ mutex_lock(&s->max310x_mutex);
+
+ /* Mask termios capabilities we don't support */
+ termios->c_cflag &= ~CMSPAR;
+ termios->c_iflag &= ~IXANY;
+
+ /* Word size */
+ switch (termios->c_cflag & CSIZE) {
+ case CS5:
+ lcr = MAX310X_LCR_WORD_LEN_5;
+ break;
+ case CS6:
+ lcr = MAX310X_LCR_WORD_LEN_6;
+ break;
+ case CS7:
+ lcr = MAX310X_LCR_WORD_LEN_7;
+ break;
+ case CS8:
+ default:
+ lcr = MAX310X_LCR_WORD_LEN_8;
+ break;
+ }
+
+ /* Parity */
+ if (termios->c_cflag & PARENB) {
+ lcr |= MAX310X_LCR_PARITY_BIT;
+ if (!(termios->c_cflag & PARODD))
+ lcr |= MAX310X_LCR_EVENPARITY_BIT;
+ }
+
+ /* Stop bits */
+ if (termios->c_cflag & CSTOPB)
+ lcr |= MAX310X_LCR_STOPLEN_BIT; /* 2 stops */
+
+ /* Update LCR register */
+ regmap_write(s->regmap, MAX310X_LCR_REG, lcr);
+
+ /* Set read status mask */
+ port->read_status_mask = MAX310X_LSR_RXOVR_BIT;
+ if (termios->c_iflag & INPCK)
+ port->read_status_mask |= MAX310X_LSR_RXPAR_BIT |
+ MAX310X_LSR_FRERR_BIT;
+ if (termios->c_iflag & (BRKINT | PARMRK))
+ port->read_status_mask |= MAX310X_LSR_RXBRK_BIT;
+
+ /* Set status ignore mask */
+ port->ignore_status_mask = 0;
+ if (termios->c_iflag & IGNBRK)
+ port->ignore_status_mask |= MAX310X_LSR_RXBRK_BIT;
+ if (!(termios->c_cflag & CREAD))
+ port->ignore_status_mask |= MAX310X_LSR_RXPAR_BIT |
+ MAX310X_LSR_RXOVR_BIT |
+ MAX310X_LSR_FRERR_BIT |
+ MAX310X_LSR_RXBRK_BIT;
+
+ /* Configure flow control */
+ regmap_write(s->regmap, MAX310X_XON1_REG, termios->c_cc[VSTART]);
+ regmap_write(s->regmap, MAX310X_XOFF1_REG, termios->c_cc[VSTOP]);
+ if (termios->c_cflag & CRTSCTS)
+ flow |= MAX310X_FLOWCTRL_AUTOCTS_BIT |
+ MAX310X_FLOWCTRL_AUTORTS_BIT;
+ if (termios->c_iflag & IXON)
+ flow |= MAX310X_FLOWCTRL_SWFLOW3_BIT |
+ MAX310X_FLOWCTRL_SWFLOWEN_BIT;
+ if (termios->c_iflag & IXOFF)
+ flow |= MAX310X_FLOWCTRL_SWFLOW1_BIT |
+ MAX310X_FLOWCTRL_SWFLOWEN_BIT;
+ regmap_write(s->regmap, MAX310X_FLOWCTRL_REG, flow);
+
+ /* Get baud rate generator configuration */
+ baud = uart_get_baud_rate(port, termios, old,
+ port->uartclk / 16 / 0xffff,
+ port->uartclk / 4);
+
+ /* Setup baudrate generator */
+ max310x_set_baud(s, baud);
+
+ /* Update timeout according to new baud rate */
+ uart_update_timeout(port, termios->c_cflag, baud);
+
+ mutex_unlock(&s->max310x_mutex);
+}
+
+static int max310x_startup(struct uart_port *port)
+{
+ unsigned int val, line = port->line;
+ struct max310x_port *s = container_of(port, struct max310x_port, port);
+
+ if (s->pdata->suspend)
+ s->pdata->suspend(0);
+
+ mutex_lock(&s->max310x_mutex);
+
+ /* Configure baud rate, 9600 as default */
+ max310x_set_baud(s, 9600);
+
+ /* Configure LCR register, 8N1 mode by default */
+ val = MAX310X_LCR_WORD_LEN_8;
+ regmap_write(s->regmap, MAX310X_LCR_REG, val);
+
+ /* Configure MODE1 register */
+ regmap_update_bits(s->regmap, MAX310X_MODE1_REG,
+ MAX310X_MODE1_TRNSCVCTRL_BIT,
+ (s->pdata->uart_flags[line] & MAX310X_AUTO_DIR_CTRL)
+ ? MAX310X_MODE1_TRNSCVCTRL_BIT : 0);
+
+ /* Configure MODE2 register */
+ val = MAX310X_MODE2_RXEMPTINV_BIT;
+ if (s->pdata->uart_flags[line] & MAX310X_LOOPBACK)
+ val |= MAX310X_MODE2_LOOPBACK_BIT;
+ if (s->pdata->uart_flags[line] & MAX310X_ECHO_SUPRESS)
+ val |= MAX310X_MODE2_ECHOSUPR_BIT;
+
+ /* Reset FIFOs */
+ val |= MAX310X_MODE2_FIFORST_BIT;
+ regmap_write(s->regmap, MAX310X_MODE2_REG, val);
+
+ /* Configure FIFO trigger level register */
+ /* RX FIFO trigger for 16 words, TX FIFO trigger for 64 words */
+ val = MAX310X_FIFOTRIGLVL_RX(16) | MAX310X_FIFOTRIGLVL_TX(64);
+ regmap_write(s->regmap, MAX310X_FIFOTRIGLVL_REG, val);
+
+ /* Configure flow control levels */
+ /* Flow control halt level 96, resume level 48 */
+ val = MAX310X_FLOWLVL_RES(48) | MAX310X_FLOWLVL_HALT(96);
+ regmap_write(s->regmap, MAX310X_FLOWLVL_REG, val);
+
+ /* Clear timeout register */
+ regmap_write(s->regmap, MAX310X_RXTO_REG, 0);
+
+ /* Configure LSR interrupt enable register */
+ /* Enable RX timeout interrupt */
+ val = MAX310X_LSR_RXTO_BIT;
+ regmap_write(s->regmap, MAX310X_LSR_IRQEN_REG, val);
+
+ /* Clear FIFO reset */
+ regmap_update_bits(s->regmap, MAX310X_MODE2_REG,
+ MAX310X_MODE2_FIFORST_BIT, 0);
+
+ /* Clear IRQ status register by reading it */
+ regmap_read(s->regmap, MAX310X_IRQSTS_REG, &val);
+
+ /* Configure interrupt enable register */
+ /* Enable CTS change interrupt */
+ val = MAX310X_IRQ_CTS_BIT;
+ /* Enable RX, TX interrupts */
+ val |= MAX310X_IRQ_RX | MAX310X_IRQ_TX;
+ regmap_write(s->regmap, MAX310X_IRQEN_REG, val);
+
+ mutex_unlock(&s->max310x_mutex);
+
+ return 0;
+}
+
+static void max310x_shutdown(struct uart_port *port)
+{
+ struct max310x_port *s = container_of(port, struct max310x_port, port);
+
+ /* Disable all interrupts */
+ mutex_lock(&s->max310x_mutex);
+ regmap_write(s->regmap, MAX310X_IRQEN_REG, 0);
+ mutex_unlock(&s->max310x_mutex);
+
+ if (s->pdata->suspend)
+ s->pdata->suspend(1);
+}
+
+static const char *max310x_type(struct uart_port *port)
+{
+ struct max310x_port *s = container_of(port, struct max310x_port, port);
+
+ return (port->type == PORT_MAX310X) ? s->name : NULL;
+}
+
+static int max310x_request_port(struct uart_port *port)
+{
+ /* Do nothing */
+ return 0;
+}
+
+static void max310x_release_port(struct uart_port *port)
+{
+ /* Do nothing */
+}
+
+static void max310x_config_port(struct uart_port *port, int flags)
+{
+ if (flags & UART_CONFIG_TYPE)
+ port->type = PORT_MAX310X;
+}
+
+static int max310x_verify_port(struct uart_port *port, struct serial_struct *ser)
+{
+ if ((ser->type == PORT_UNKNOWN) || (ser->type == PORT_MAX310X))
+ return 0;
+ if (ser->irq == port->irq)
+ return 0;
+
+ return -EINVAL;
+}
+
+static struct uart_ops max310x_ops = {
+ .tx_empty = max310x_tx_empty,
+ .set_mctrl = max310x_set_mctrl,
+ .get_mctrl = max310x_get_mctrl,
+ .stop_tx = max310x_stop_tx,
+ .start_tx = max310x_start_tx,
+ .stop_rx = max310x_stop_rx,
+ .enable_ms = max310x_enable_ms,
+ .break_ctl = max310x_break_ctl,
+ .startup = max310x_startup,
+ .shutdown = max310x_shutdown,
+ .set_termios = max310x_set_termios,
+ .type = max310x_type,
+ .request_port = max310x_request_port,
+ .release_port = max310x_release_port,
+ .config_port = max310x_config_port,
+ .verify_port = max310x_verify_port,
+};
+
+static int max310x_suspend(struct spi_device *spi, pm_message_t state)
+{
+ int ret;
+ struct max310x_port *s = dev_get_drvdata(&spi->dev);
+
+ dev_dbg(&spi->dev, "Suspend\n");
+
+ ret = uart_suspend_port(&s->uart, &s->port);
+
+ mutex_lock(&s->max310x_mutex);
+
+ /* Enable sleep mode */
+ regmap_update_bits(s->regmap, MAX310X_MODE1_REG,
+ MAX310X_MODE1_FORCESLEEP_BIT,
+ MAX310X_MODE1_FORCESLEEP_BIT);
+
+ mutex_unlock(&s->max310x_mutex);
+
+ if (s->pdata->suspend)
+ s->pdata->suspend(1);
+
+ return ret;
+}
+
+static int max310x_resume(struct spi_device *spi)
+{
+ struct max310x_port *s = dev_get_drvdata(&spi->dev);
+
+ dev_dbg(&spi->dev, "Resume\n");
+
+ if (s->pdata->suspend)
+ s->pdata->suspend(0);
+
+ mutex_lock(&s->max310x_mutex);
+
+ /* Disable sleep mode */
+ regmap_update_bits(s->regmap, MAX310X_MODE1_REG,
+ MAX310X_MODE1_FORCESLEEP_BIT,
+ 0);
+
+ max310x_wait_pll(s);
+
+ mutex_unlock(&s->max310x_mutex);
+
+ return uart_resume_port(&s->uart, &s->port);
+}
+
+#ifdef CONFIG_GPIOLIB
+static int max310x_gpio_get(struct gpio_chip *chip, unsigned offset)
+{
+ unsigned int val = 0;
+ struct max310x_port *s = container_of(chip, struct max310x_port, gpio);
+
+ mutex_lock(&s->max310x_mutex);
+ regmap_read(s->regmap, MAX310X_GPIODATA_REG, &val);
+ mutex_unlock(&s->max310x_mutex);
+
+ return !!((val >> 4) & (1 << offset));
+}
+
+static void max310x_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
+{
+ struct max310x_port *s = container_of(chip, struct max310x_port, gpio);
+
+ mutex_lock(&s->max310x_mutex);
+ regmap_update_bits(s->regmap, MAX310X_GPIODATA_REG, 1 << offset, value ?
+ 1 << offset : 0);
+ mutex_unlock(&s->max310x_mutex);
+}
+
+static int max310x_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
+{
+ struct max310x_port *s = container_of(chip, struct max310x_port, gpio);
+
+ mutex_lock(&s->max310x_mutex);
+
+ regmap_update_bits(s->regmap, MAX310X_GPIOCFG_REG, 1 << offset, 0);
+
+ mutex_unlock(&s->max310x_mutex);
+
+ return 0;
+}
+
+static int max310x_gpio_direction_output(struct gpio_chip *chip,
+ unsigned offset, int value)
+{
+ struct max310x_port *s = container_of(chip, struct max310x_port, gpio);
+
+ mutex_lock(&s->max310x_mutex);
+
+ regmap_update_bits(s->regmap, MAX310X_GPIOCFG_REG, 1 << offset,
+ 1 << offset);
+ regmap_update_bits(s->regmap, MAX310X_GPIODATA_REG, 1 << offset, value ?
+ 1 << offset : 0);
+
+ mutex_unlock(&s->max310x_mutex);
+
+ return 0;
+}
+#endif
+
+/* Generic platform data */
+static struct max310x_pdata generic_plat_data = {
+ .driver_flags = MAX310X_EXT_CLK,
+ .uart_flags[0] = MAX310X_ECHO_SUPRESS,
+ .frequency = 26000000,
+};
+
+static int __devinit max310x_probe(struct spi_device *spi)
+{
+ struct max310x_port *s;
+ struct device *dev = &spi->dev;
+ int chiptype = spi_get_device_id(spi)->driver_data;
+ struct max310x_pdata *pdata = dev->platform_data;
+ unsigned int val = 0;
+ int ret;
+
+ /* Check for IRQ */
+ if (spi->irq <= 0) {
+ dev_err(dev, "No IRQ specified\n");
+ return -ENOTSUPP;
+ }
+
+ /* Alloc port structure */
+ s = devm_kzalloc(dev, sizeof(struct max310x_port), GFP_KERNEL);
+ if (!s) {
+ dev_err(dev, "Error allocating port structure\n");
+ return -ENOMEM;
+ }
+ dev_set_drvdata(dev, s);
+
+ if (!pdata) {
+ dev_warn(dev, "No platform data supplied, using defaults\n");
+ pdata = &generic_plat_data;
+ }
+ s->pdata = pdata;
+
+ /* Individual chip settings */
+ switch (chiptype) {
+ case MAX310X_TYPE_MAX3107:
+ s->name = "MAX3107";
+ s->nr_gpio = 4;
+ s->uart.nr = 1;
+ s->regcfg.max_register = 0x1f;
+ break;
+ case MAX310X_TYPE_MAX3108:
+ s->name = "MAX3108";
+ s->nr_gpio = 4;
+ s->uart.nr = 1;
+ s->regcfg.max_register = 0x1e;
+ break;
+ default:
+ dev_err(dev, "Unsupported chip type %i\n", chiptype);
+ return -ENOTSUPP;
+ }
+
+ /* Check input frequency */
+ if ((pdata->driver_flags & MAX310X_EXT_CLK) &&
+ ((pdata->frequency < 500000) || (pdata->frequency > 35000000)))
+ goto err_freq;
+ /* Check frequency for quartz */
+ if (!(pdata->driver_flags & MAX310X_EXT_CLK) &&
+ ((pdata->frequency < 1000000) || (pdata->frequency > 4000000)))
+ goto err_freq;
+
+ mutex_init(&s->max310x_mutex);
+
+ /* Setup SPI bus */
+ spi->mode = SPI_MODE_0;
+ spi->bits_per_word = 8;
+ spi->max_speed_hz = 26000000;
+ spi_setup(spi);
+
+ /* Setup regmap */
+ s->regcfg.reg_bits = 8;
+ s->regcfg.val_bits = 8;
+ s->regcfg.read_flag_mask = 0x00;
+ s->regcfg.write_flag_mask = 0x80;
+ s->regcfg.cache_type = REGCACHE_RBTREE;
+ s->regcfg.writeable_reg = max3107_8_reg_writeable;
+ s->regcfg.volatile_reg = max310x_reg_volatile;
+ s->regcfg.precious_reg = max310x_reg_precious;
+ s->regmap = devm_regmap_init_spi(spi, &s->regcfg);
+ if (IS_ERR(s->regmap)) {
+ ret = PTR_ERR(s->regmap);
+ dev_err(dev, "Failed to initialize register map\n");
+ goto err_out;
+ }
+
+ /* Reset chip & check SPI function */
+ ret = regmap_write(s->regmap, MAX310X_MODE2_REG, MAX310X_MODE2_RST_BIT);
+ if (ret) {
+ dev_err(dev, "SPI transfer failed\n");
+ goto err_out;
+ }
+ /* Clear chip reset */
+ regmap_write(s->regmap, MAX310X_MODE2_REG, 0);
+
+ switch (chiptype) {
+ case MAX310X_TYPE_MAX3107:
+ /* Check REV ID to ensure we are talking to what we expect */
+ regmap_read(s->regmap, MAX3107_REVID_REG, &val);
+ if (((val & MAX3107_REV_MASK) != MAX3107_REV_ID)) {
+ dev_err(dev, "%s ID 0x%02x does not match\n",
+ s->name, val);
+ ret = -ENODEV;
+ goto err_out;
+ }
+ break;
+ case MAX310X_TYPE_MAX3108:
+ /* MAX3108 have not REV ID register, we just check default value
+ * from clocksource register to make sure everything works.
+ */
+ regmap_read(s->regmap, MAX310X_CLKSRC_REG, &val);
+ if (val != (MAX310X_CLKSRC_EXTCLK_BIT |
+ MAX310X_CLKSRC_PLLBYP_BIT)) {
+ dev_err(dev, "%s not present\n", s->name);
+ ret = -ENODEV;
+ goto err_out;
+ }
+ break;
+ }
+
+ /* Board specific configure */
+ if (pdata->init)
+ pdata->init();
+ if (pdata->suspend)
+ pdata->suspend(0);
+
+ /* Calculate referecne clock */
+ s->uartclk = max310x_set_ref_clk(s);
+
+ /* Disable all interrupts */
+ regmap_write(s->regmap, MAX310X_IRQEN_REG, 0);
+
+ /* Setup MODE1 register */
+ val = MAX310X_MODE1_IRQSEL_BIT; /* Enable IRQ pin */
+ if (pdata->driver_flags & MAX310X_AUTOSLEEP)
+ val = MAX310X_MODE1_AUTOSLEEP_BIT;
+ regmap_write(s->regmap, MAX310X_MODE1_REG, val);
+
+ /* Setup interrupt */
+ ret = devm_request_threaded_irq(dev, spi->irq, NULL, max310x_ist,
+ IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
+ dev_name(dev), s);
+ if (ret) {
+ dev_err(dev, "Unable to reguest IRQ %i\n", spi->irq);
+ goto err_out;
+ }
+
+ /* Register UART driver */
+ s->uart.owner = THIS_MODULE;
+ s->uart.driver_name = dev_name(dev);
+ s->uart.dev_name = "ttyMAX";
+ s->uart.major = MAX310X_MAJOR;
+ s->uart.minor = MAX310X_MINOR;
+ ret = uart_register_driver(&s->uart);
+ if (ret) {
+ dev_err(dev, "Registering UART driver failed\n");
+ goto err_out;
+ }
+
+ /* Initialize workqueue for start TX */
+ s->wq = create_freezable_workqueue(dev_name(dev));
+ INIT_WORK(&s->tx_work, max310x_wq_proc);
+
+ /* Initialize UART port data */
+ s->port.line = 0;
+ s->port.dev = dev;
+ s->port.irq = spi->irq;
+ s->port.type = PORT_MAX310X;
+ s->port.fifosize = MAX310X_FIFO_SIZE;
+ s->port.flags = UPF_SKIP_TEST | UPF_FIXED_TYPE;
+ s->port.iotype = UPIO_PORT;
+ s->port.membase = (void __iomem *)0xffffffff; /* Bogus value */
+ s->port.uartclk = s->uartclk;
+ s->port.ops = &max310x_ops;
+ uart_add_one_port(&s->uart, &s->port);
+
+#ifdef CONFIG_GPIOLIB
+ /* Setup GPIO cotroller */
+ if (pdata->gpio_base) {
+ s->gpio.owner = THIS_MODULE;
+ s->gpio.dev = dev;
+ s->gpio.label = dev_name(dev);
+ s->gpio.direction_input = max310x_gpio_direction_input;
+ s->gpio.get = max310x_gpio_get;
+ s->gpio.direction_output= max310x_gpio_direction_output;
+ s->gpio.set = max310x_gpio_set;
+ s->gpio.base = pdata->gpio_base;
+ s->gpio.ngpio = s->nr_gpio;
+ if (gpiochip_add(&s->gpio)) {
+ /* Indicate that we should not call gpiochip_remove */
+ s->gpio.base = 0;
+ }
+ } else
+ dev_info(dev, "GPIO support not enabled\n");
+#endif
+
+ /* Go to suspend mode */
+ if (pdata->suspend)
+ pdata->suspend(1);
+
+ return 0;
+
+err_freq:
+ dev_err(dev, "Frequency parameter incorrect\n");
+ ret = -EINVAL;
+
+err_out:
+ dev_set_drvdata(dev, NULL);
+ devm_kfree(dev, s);
+
+ return ret;
+}
+
+static int __devexit max310x_remove(struct spi_device *spi)
+{
+ struct device *dev = &spi->dev;
+ struct max310x_port *s = dev_get_drvdata(dev);
+
+ dev_dbg(dev, "Removing port\n");
+
+ devm_free_irq(dev, s->port.irq, s);
+
+ destroy_workqueue(s->wq);
+
+ uart_remove_one_port(&s->uart, &s->port);
+
+ uart_unregister_driver(&s->uart);
+
+#ifdef CONFIG_GPIOLIB
+ if (s->pdata->gpio_base)
+ gpiochip_remove(&s->gpio);
+#endif
+
+ dev_set_drvdata(dev, NULL);
+
+ if (s->pdata->suspend)
+ s->pdata->suspend(1);
+ if (s->pdata->exit)
+ s->pdata->exit();
+
+ devm_kfree(dev, s);
+
+ return 0;
+}
+
+static const struct spi_device_id max310x_id_table[] = {
+ { "max3107", MAX310X_TYPE_MAX3107 },
+ { "max3108", MAX310X_TYPE_MAX3108 },
+};
+MODULE_DEVICE_TABLE(spi, max310x_id_table);
+
+static struct spi_driver max310x_driver = {
+ .driver = {
+ .name = "max310x",
+ .owner = THIS_MODULE,
+ },
+ .probe = max310x_probe,
+ .remove = __devexit_p(max310x_remove),
+ .suspend = max310x_suspend,
+ .resume = max310x_resume,
+ .id_table = max310x_id_table,
+};
+module_spi_driver(max310x_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>");
+MODULE_DESCRIPTION("MAX310X serial driver");
--- /dev/null
+/*
+ * Maxim (Dallas) MAX3107/8 serial driver
+ *
+ * Copyright (C) 2012 Alexander Shiyan <shc_work@mail.ru>
+ *
+ * Based on max3100.c, by Christian Pellegrin <chripell@evolware.org>
+ * Based on max3110.c, by Feng Tang <feng.tang@intel.com>
+ * Based on max3107.c, by Aavamobile
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#ifndef _MAX310X_H_
+#define _MAX310X_H_
+
+/*
+ * Example board initialization data:
+ *
+ * static struct max310x_pdata max3107_pdata = {
+ * .driver_flags = MAX310X_EXT_CLK,
+ * .uart_flags[0] = MAX310X_ECHO_SUPRESS | MAX310X_AUTO_DIR_CTRL,
+ * .frequency = 3686400,
+ * .gpio_base = -1,
+ * };
+ *
+ * static struct spi_board_info spi_device_max3107[] = {
+ * {
+ * .modalias = "max3107",
+ * .irq = IRQ_EINT3,
+ * .bus_num = 1,
+ * .chip_select = 1,
+ * .platform_data = &max3107_pdata,
+ * },
+ * };
+ */
+
+#define MAX310X_MAX_UARTS 1
+
+/* MAX310X platform data structure */
+struct max310x_pdata {
+ /* Flags global to driver */
+ const u8 driver_flags:2;
+#define MAX310X_EXT_CLK (0x00000001) /* External clock enable */
+#define MAX310X_AUTOSLEEP (0x00000002) /* Enable AutoSleep mode */
+ /* Flags global to UART port */
+ const u8 uart_flags[MAX310X_MAX_UARTS];
+#define MAX310X_LOOPBACK (0x00000001) /* Loopback mode enable */
+#define MAX310X_ECHO_SUPRESS (0x00000002) /* Enable echo supress */
+#define MAX310X_AUTO_DIR_CTRL (0x00000004) /* Enable Auto direction
+ * control (RS-485)
+ */
+ /* Frequency (extrenal clock or crystal) */
+ const int frequency;
+ /* GPIO base number (can be negative) */
+ const int gpio_base;
+ /* Called during startup */
+ void (*init)(void);
+ /* Called before finish */
+ void (*exit)(void);
+ /* Suspend callback */
+ void (*suspend)(int do_suspend);
+};
+
+#endif
/* SH-SCI */
#define PORT_SCIFB 93
-/* MAX3107 */
-#define PORT_MAX3107 94
+/* MAX310X */
+#define PORT_MAX310X 94
/* High Speed UART for Medfield */
#define PORT_MFD 95
projects / GitHub / LineageOS / G12 / android_kernel_amlogic_linux-4.9.git / commitdiff