--- /dev/null
+/*
+ * Marvell MMC/SD/SDIO driver
+ *
+ * Authors: Maen Suleiman, Nicolas Pitre
+ * Copyright (C) 2008-2009 Marvell Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/platform_device.h>
+#include <linux/mbus.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/dma-mapping.h>
+#include <linux/scatterlist.h>
+#include <linux/irq.h>
+#include <linux/gpio.h>
+#include <linux/mmc/host.h>
+
+#include <asm/sizes.h>
+#include <asm/unaligned.h>
+#include <plat/mvsdio.h>
+
+#include "mvsdio.h"
+
+#define DRIVER_NAME "mvsdio"
+
+static int maxfreq = MVSD_CLOCKRATE_MAX;
+static int nodma;
+
+struct mvsd_host {
+ void __iomem *base;
+ struct mmc_request *mrq;
+ spinlock_t lock;
+ unsigned int xfer_mode;
+ unsigned int intr_en;
+ unsigned int ctrl;
+ unsigned int pio_size;
+ void *pio_ptr;
+ unsigned int sg_frags;
+ unsigned int ns_per_clk;
+ unsigned int clock;
+ unsigned int base_clock;
+ struct timer_list timer;
+ struct mmc_host *mmc;
+ struct device *dev;
+ struct resource *res;
+ int irq;
+ int gpio_card_detect;
+ int gpio_write_protect;
+};
+
+#define mvsd_write(offs, val) writel(val, iobase + (offs))
+#define mvsd_read(offs) readl(iobase + (offs))
+
+static int mvsd_setup_data(struct mvsd_host *host, struct mmc_data *data)
+{
+ void __iomem *iobase = host->base;
+ unsigned int tmout;
+ int tmout_index;
+
+ /* If timeout=0 then maximum timeout index is used. */
+ tmout = DIV_ROUND_UP(data->timeout_ns, host->ns_per_clk);
+ tmout += data->timeout_clks;
+ tmout_index = fls(tmout - 1) - 12;
+ if (tmout_index < 0)
+ tmout_index = 0;
+ if (tmout_index > MVSD_HOST_CTRL_TMOUT_MAX)
+ tmout_index = MVSD_HOST_CTRL_TMOUT_MAX;
+
+ dev_dbg(host->dev, "data %s at 0x%08x: blocks=%d blksz=%d tmout=%u (%d)\n",
+ (data->flags & MMC_DATA_READ) ? "read" : "write",
+ (u32)sg_virt(data->sg), data->blocks, data->blksz,
+ tmout, tmout_index);
+
+ host->ctrl &= ~MVSD_HOST_CTRL_TMOUT_MASK;
+ host->ctrl |= MVSD_HOST_CTRL_TMOUT(tmout_index);
+ mvsd_write(MVSD_HOST_CTRL, host->ctrl);
+ mvsd_write(MVSD_BLK_COUNT, data->blocks);
+ mvsd_write(MVSD_BLK_SIZE, data->blksz);
+
+ if (nodma || (data->blksz | data->sg->offset) & 3) {
+ /*
+ * We cannot do DMA on a buffer which offset or size
+ * is not aligned on a 4-byte boundary.
+ */
+ host->pio_size = data->blocks * data->blksz;
+ host->pio_ptr = sg_virt(data->sg);
+ if (!nodma)
+ printk(KERN_DEBUG "%s: fallback to PIO for data "
+ "at 0x%p size %d\n",
+ mmc_hostname(host->mmc),
+ host->pio_ptr, host->pio_size);
+ return 1;
+ } else {
+ dma_addr_t phys_addr;
+ int dma_dir = (data->flags & MMC_DATA_READ) ?
+ DMA_FROM_DEVICE : DMA_TO_DEVICE;
+ host->sg_frags = dma_map_sg(mmc_dev(host->mmc), data->sg,
+ data->sg_len, dma_dir);
+ phys_addr = sg_dma_address(data->sg);
+ mvsd_write(MVSD_SYS_ADDR_LOW, (u32)phys_addr & 0xffff);
+ mvsd_write(MVSD_SYS_ADDR_HI, (u32)phys_addr >> 16);
+ return 0;
+ }
+}
+
+static void mvsd_request(struct mmc_host *mmc, struct mmc_request *mrq)
+{
+ struct mvsd_host *host = mmc_priv(mmc);
+ void __iomem *iobase = host->base;
+ struct mmc_command *cmd = mrq->cmd;
+ u32 cmdreg = 0, xfer = 0, intr = 0;
+ unsigned long flags;
+
+ BUG_ON(host->mrq != NULL);
+ host->mrq = mrq;
+
+ dev_dbg(host->dev, "cmd %d (hw state 0x%04x)\n",
+ cmd->opcode, mvsd_read(MVSD_HW_STATE));
+
+ cmdreg = MVSD_CMD_INDEX(cmd->opcode);
+
+ if (cmd->flags & MMC_RSP_BUSY)
+ cmdreg |= MVSD_CMD_RSP_48BUSY;
+ else if (cmd->flags & MMC_RSP_136)
+ cmdreg |= MVSD_CMD_RSP_136;
+ else if (cmd->flags & MMC_RSP_PRESENT)
+ cmdreg |= MVSD_CMD_RSP_48;
+ else
+ cmdreg |= MVSD_CMD_RSP_NONE;
+
+ if (cmd->flags & MMC_RSP_CRC)
+ cmdreg |= MVSD_CMD_CHECK_CMDCRC;
+
+ if (cmd->flags & MMC_RSP_OPCODE)
+ cmdreg |= MVSD_CMD_INDX_CHECK;
+
+ if (cmd->flags & MMC_RSP_PRESENT) {
+ cmdreg |= MVSD_UNEXPECTED_RESP;
+ intr |= MVSD_NOR_UNEXP_RSP;
+ }
+
+ if (mrq->data) {
+ struct mmc_data *data = mrq->data;
+ int pio;
+
+ cmdreg |= MVSD_CMD_DATA_PRESENT | MVSD_CMD_CHECK_DATACRC16;
+ xfer |= MVSD_XFER_MODE_HW_WR_DATA_EN;
+ if (data->flags & MMC_DATA_READ)
+ xfer |= MVSD_XFER_MODE_TO_HOST;
+
+ pio = mvsd_setup_data(host, data);
+ if (pio) {
+ xfer |= MVSD_XFER_MODE_PIO;
+ /* PIO section of mvsd_irq has comments on those bits */
+ if (data->flags & MMC_DATA_WRITE)
+ intr |= MVSD_NOR_TX_AVAIL;
+ else if (host->pio_size > 32)
+ intr |= MVSD_NOR_RX_FIFO_8W;
+ else
+ intr |= MVSD_NOR_RX_READY;
+ }
+
+ if (data->stop) {
+ struct mmc_command *stop = data->stop;
+ u32 cmd12reg = 0;
+
+ mvsd_write(MVSD_AUTOCMD12_ARG_LOW, stop->arg & 0xffff);
+ mvsd_write(MVSD_AUTOCMD12_ARG_HI, stop->arg >> 16);
+
+ if (stop->flags & MMC_RSP_BUSY)
+ cmd12reg |= MVSD_AUTOCMD12_BUSY;
+ if (stop->flags & MMC_RSP_OPCODE)
+ cmd12reg |= MVSD_AUTOCMD12_INDX_CHECK;
+ cmd12reg |= MVSD_AUTOCMD12_INDEX(stop->opcode);
+ mvsd_write(MVSD_AUTOCMD12_CMD, cmd12reg);
+
+ xfer |= MVSD_XFER_MODE_AUTO_CMD12;
+ intr |= MVSD_NOR_AUTOCMD12_DONE;
+ } else {
+ intr |= MVSD_NOR_XFER_DONE;
+ }
+ } else {
+ intr |= MVSD_NOR_CMD_DONE;
+ }
+
+ mvsd_write(MVSD_ARG_LOW, cmd->arg & 0xffff);
+ mvsd_write(MVSD_ARG_HI, cmd->arg >> 16);
+
+ spin_lock_irqsave(&host->lock, flags);
+
+ host->xfer_mode &= MVSD_XFER_MODE_INT_CHK_EN;
+ host->xfer_mode |= xfer;
+ mvsd_write(MVSD_XFER_MODE, host->xfer_mode);
+
+ mvsd_write(MVSD_NOR_INTR_STATUS, ~MVSD_NOR_CARD_INT);
+ mvsd_write(MVSD_ERR_INTR_STATUS, 0xffff);
+ mvsd_write(MVSD_CMD, cmdreg);
+
+ host->intr_en &= MVSD_NOR_CARD_INT;
+ host->intr_en |= intr | MVSD_NOR_ERROR;
+ mvsd_write(MVSD_NOR_INTR_EN, host->intr_en);
+ mvsd_write(MVSD_ERR_INTR_EN, 0xffff);
+
+ mod_timer(&host->timer, jiffies + 5 * HZ);
+
+ spin_unlock_irqrestore(&host->lock, flags);
+}
+
+static u32 mvsd_finish_cmd(struct mvsd_host *host, struct mmc_command *cmd,
+ u32 err_status)
+{
+ void __iomem *iobase = host->base;
+
+ if (cmd->flags & MMC_RSP_136) {
+ unsigned int response[8], i;
+ for (i = 0; i < 8; i++)
+ response[i] = mvsd_read(MVSD_RSP(i));
+ cmd->resp[0] = ((response[0] & 0x03ff) << 22) |
+ ((response[1] & 0xffff) << 6) |
+ ((response[2] & 0xfc00) >> 10);
+ cmd->resp[1] = ((response[2] & 0x03ff) << 22) |
+ ((response[3] & 0xffff) << 6) |
+ ((response[4] & 0xfc00) >> 10);
+ cmd->resp[2] = ((response[4] & 0x03ff) << 22) |
+ ((response[5] & 0xffff) << 6) |
+ ((response[6] & 0xfc00) >> 10);
+ cmd->resp[3] = ((response[6] & 0x03ff) << 22) |
+ ((response[7] & 0x3fff) << 8);
+ } else if (cmd->flags & MMC_RSP_PRESENT) {
+ unsigned int response[3], i;
+ for (i = 0; i < 3; i++)
+ response[i] = mvsd_read(MVSD_RSP(i));
+ cmd->resp[0] = ((response[2] & 0x003f) << (8 - 8)) |
+ ((response[1] & 0xffff) << (14 - 8)) |
+ ((response[0] & 0x03ff) << (30 - 8));
+ cmd->resp[1] = ((response[0] & 0xfc00) >> 10);
+ cmd->resp[2] = 0;
+ cmd->resp[3] = 0;
+ }
+
+ if (err_status & MVSD_ERR_CMD_TIMEOUT) {
+ cmd->error = -ETIMEDOUT;
+ } else if (err_status & (MVSD_ERR_CMD_CRC | MVSD_ERR_CMD_ENDBIT |
+ MVSD_ERR_CMD_INDEX | MVSD_ERR_CMD_STARTBIT)) {
+ cmd->error = -EILSEQ;
+ }
+ err_status &= ~(MVSD_ERR_CMD_TIMEOUT | MVSD_ERR_CMD_CRC |
+ MVSD_ERR_CMD_ENDBIT | MVSD_ERR_CMD_INDEX |
+ MVSD_ERR_CMD_STARTBIT);
+
+ return err_status;
+}
+
+static u32 mvsd_finish_data(struct mvsd_host *host, struct mmc_data *data,
+ u32 err_status)
+{
+ void __iomem *iobase = host->base;
+
+ if (host->pio_ptr) {
+ host->pio_ptr = NULL;
+ host->pio_size = 0;
+ } else {
+ dma_unmap_sg(mmc_dev(host->mmc), data->sg, host->sg_frags,
+ (data->flags & MMC_DATA_READ) ?
+ DMA_FROM_DEVICE : DMA_TO_DEVICE);
+ }
+
+ if (err_status & MVSD_ERR_DATA_TIMEOUT)
+ data->error = -ETIMEDOUT;
+ else if (err_status & (MVSD_ERR_DATA_CRC | MVSD_ERR_DATA_ENDBIT))
+ data->error = -EILSEQ;
+ else if (err_status & MVSD_ERR_XFER_SIZE)
+ data->error = -EBADE;
+ err_status &= ~(MVSD_ERR_DATA_TIMEOUT | MVSD_ERR_DATA_CRC |
+ MVSD_ERR_DATA_ENDBIT | MVSD_ERR_XFER_SIZE);
+
+ dev_dbg(host->dev, "data done: blocks_left=%d, bytes_left=%d\n",
+ mvsd_read(MVSD_CURR_BLK_LEFT), mvsd_read(MVSD_CURR_BYTE_LEFT));
+ data->bytes_xfered =
+ (data->blocks - mvsd_read(MVSD_CURR_BLK_LEFT)) * data->blksz;
+ /* We can't be sure about the last block when errors are detected */
+ if (data->bytes_xfered && data->error)
+ data->bytes_xfered -= data->blksz;
+
+ /* Handle Auto cmd 12 response */
+ if (data->stop) {
+ unsigned int response[3], i;
+ for (i = 0; i < 3; i++)
+ response[i] = mvsd_read(MVSD_AUTO_RSP(i));
+ data->stop->resp[0] = ((response[2] & 0x003f) << (8 - 8)) |
+ ((response[1] & 0xffff) << (14 - 8)) |
+ ((response[0] & 0x03ff) << (30 - 8));
+ data->stop->resp[1] = ((response[0] & 0xfc00) >> 10);
+ data->stop->resp[2] = 0;
+ data->stop->resp[3] = 0;
+
+ if (err_status & MVSD_ERR_AUTOCMD12) {
+ u32 err_cmd12 = mvsd_read(MVSD_AUTOCMD12_ERR_STATUS);
+ dev_dbg(host->dev, "c12err 0x%04x\n", err_cmd12);
+ if (err_cmd12 & MVSD_AUTOCMD12_ERR_NOTEXE)
+ data->stop->error = -ENOEXEC;
+ else if (err_cmd12 & MVSD_AUTOCMD12_ERR_TIMEOUT)
+ data->stop->error = -ETIMEDOUT;
+ else if (err_cmd12)
+ data->stop->error = -EILSEQ;
+ err_status &= ~MVSD_ERR_AUTOCMD12;
+ }
+ }
+
+ return err_status;
+}
+
+static irqreturn_t mvsd_irq(int irq, void *dev)
+{
+ struct mvsd_host *host = dev;
+ void __iomem *iobase = host->base;
+ u32 intr_status, intr_done_mask;
+ int irq_handled = 0;
+
+ intr_status = mvsd_read(MVSD_NOR_INTR_STATUS);
+ dev_dbg(host->dev, "intr 0x%04x intr_en 0x%04x hw_state 0x%04x\n",
+ intr_status, mvsd_read(MVSD_NOR_INTR_EN),
+ mvsd_read(MVSD_HW_STATE));
+
+ spin_lock(&host->lock);
+
+ /* PIO handling, if needed. Messy business... */
+ if (host->pio_size &&
+ (intr_status & host->intr_en &
+ (MVSD_NOR_RX_READY | MVSD_NOR_RX_FIFO_8W))) {
+ u16 *p = host->pio_ptr;
+ int s = host->pio_size;
+ while (s >= 32 && (intr_status & MVSD_NOR_RX_FIFO_8W)) {
+ readsw(iobase + MVSD_FIFO, p, 16);
+ p += 16;
+ s -= 32;
+ intr_status = mvsd_read(MVSD_NOR_INTR_STATUS);
+ }
+ /*
+ * Normally we'd use < 32 here, but the RX_FIFO_8W bit
+ * doesn't appear to assert when there is exactly 32 bytes
+ * (8 words) left to fetch in a transfer.
+ */
+ if (s <= 32) {
+ while (s >= 4 && (intr_status & MVSD_NOR_RX_READY)) {
+ put_unaligned(mvsd_read(MVSD_FIFO), p++);
+ put_unaligned(mvsd_read(MVSD_FIFO), p++);
+ s -= 4;
+ intr_status = mvsd_read(MVSD_NOR_INTR_STATUS);
+ }
+ if (s && s < 4 && (intr_status & MVSD_NOR_RX_READY)) {
+ u16 val[2] = {0, 0};
+ val[0] = mvsd_read(MVSD_FIFO);
+ val[1] = mvsd_read(MVSD_FIFO);
+ memcpy(p, &val, s);
+ s = 0;
+ intr_status = mvsd_read(MVSD_NOR_INTR_STATUS);
+ }
+ if (s == 0) {
+ host->intr_en &=
+ ~(MVSD_NOR_RX_READY | MVSD_NOR_RX_FIFO_8W);
+ mvsd_write(MVSD_NOR_INTR_EN, host->intr_en);
+ } else if (host->intr_en & MVSD_NOR_RX_FIFO_8W) {
+ host->intr_en &= ~MVSD_NOR_RX_FIFO_8W;
+ host->intr_en |= MVSD_NOR_RX_READY;
+ mvsd_write(MVSD_NOR_INTR_EN, host->intr_en);
+ }
+ }
+ dev_dbg(host->dev, "pio %d intr 0x%04x hw_state 0x%04x\n",
+ s, intr_status, mvsd_read(MVSD_HW_STATE));
+ host->pio_ptr = p;
+ host->pio_size = s;
+ irq_handled = 1;
+ } else if (host->pio_size &&
+ (intr_status & host->intr_en &
+ (MVSD_NOR_TX_AVAIL | MVSD_NOR_TX_FIFO_8W))) {
+ u16 *p = host->pio_ptr;
+ int s = host->pio_size;
+ /*
+ * The TX_FIFO_8W bit is unreliable. When set, bursting
+ * 16 halfwords all at once in the FIFO drops data. Actually
+ * TX_AVAIL does go off after only one word is pushed even if
+ * TX_FIFO_8W remains set.
+ */
+ while (s >= 4 && (intr_status & MVSD_NOR_TX_AVAIL)) {
+ mvsd_write(MVSD_FIFO, get_unaligned(p++));
+ mvsd_write(MVSD_FIFO, get_unaligned(p++));
+ s -= 4;
+ intr_status = mvsd_read(MVSD_NOR_INTR_STATUS);
+ }
+ if (s < 4) {
+ if (s && (intr_status & MVSD_NOR_TX_AVAIL)) {
+ u16 val[2] = {0, 0};
+ memcpy(&val, p, s);
+ mvsd_write(MVSD_FIFO, val[0]);
+ mvsd_write(MVSD_FIFO, val[1]);
+ s = 0;
+ intr_status = mvsd_read(MVSD_NOR_INTR_STATUS);
+ }
+ if (s == 0) {
+ host->intr_en &=
+ ~(MVSD_NOR_TX_AVAIL | MVSD_NOR_TX_FIFO_8W);
+ mvsd_write(MVSD_NOR_INTR_EN, host->intr_en);
+ }
+ }
+ dev_dbg(host->dev, "pio %d intr 0x%04x hw_state 0x%04x\n",
+ s, intr_status, mvsd_read(MVSD_HW_STATE));
+ host->pio_ptr = p;
+ host->pio_size = s;
+ irq_handled = 1;
+ }
+
+ mvsd_write(MVSD_NOR_INTR_STATUS, intr_status);
+
+ intr_done_mask = MVSD_NOR_CARD_INT | MVSD_NOR_RX_READY |
+ MVSD_NOR_RX_FIFO_8W | MVSD_NOR_TX_FIFO_8W;
+ if (intr_status & host->intr_en & ~intr_done_mask) {
+ struct mmc_request *mrq = host->mrq;
+ struct mmc_command *cmd = mrq->cmd;
+ u32 err_status = 0;
+
+ del_timer(&host->timer);
+ host->mrq = NULL;
+
+ host->intr_en &= MVSD_NOR_CARD_INT;
+ mvsd_write(MVSD_NOR_INTR_EN, host->intr_en);
+ mvsd_write(MVSD_ERR_INTR_EN, 0);
+
+ spin_unlock(&host->lock);
+
+ if (intr_status & MVSD_NOR_UNEXP_RSP) {
+ cmd->error = -EPROTO;
+ } else if (intr_status & MVSD_NOR_ERROR) {
+ err_status = mvsd_read(MVSD_ERR_INTR_STATUS);
+ dev_dbg(host->dev, "err 0x%04x\n", err_status);
+ }
+
+ err_status = mvsd_finish_cmd(host, cmd, err_status);
+ if (mrq->data)
+ err_status = mvsd_finish_data(host, mrq->data, err_status);
+ if (err_status) {
+ printk(KERN_ERR "%s: unhandled error status %#04x\n",
+ mmc_hostname(host->mmc), err_status);
+ cmd->error = -ENOMSG;
+ }
+
+ mmc_request_done(host->mmc, mrq);
+ irq_handled = 1;
+ } else
+ spin_unlock(&host->lock);
+
+ if (intr_status & MVSD_NOR_CARD_INT) {
+ mmc_signal_sdio_irq(host->mmc);
+ irq_handled = 1;
+ }
+
+ if (irq_handled)
+ return IRQ_HANDLED;
+
+ printk(KERN_ERR "%s: unhandled interrupt status=0x%04x en=0x%04x "
+ "pio=%d\n", mmc_hostname(host->mmc), intr_status,
+ host->intr_en, host->pio_size);
+ return IRQ_NONE;
+}
+
+static void mvsd_timeout_timer(unsigned long data)
+{
+ struct mvsd_host *host = (struct mvsd_host *)data;
+ void __iomem *iobase = host->base;
+ struct mmc_request *mrq;
+ unsigned long flags;
+
+ spin_lock_irqsave(&host->lock, flags);
+ mrq = host->mrq;
+ if (mrq) {
+ printk(KERN_ERR "%s: Timeout waiting for hardware interrupt.\n",
+ mmc_hostname(host->mmc));
+ printk(KERN_ERR "%s: hw_state=0x%04x, intr_status=0x%04x "
+ "intr_en=0x%04x\n", mmc_hostname(host->mmc),
+ mvsd_read(MVSD_HW_STATE),
+ mvsd_read(MVSD_NOR_INTR_STATUS),
+ mvsd_read(MVSD_NOR_INTR_EN));
+
+ host->mrq = NULL;
+
+ mvsd_write(MVSD_SW_RESET, MVSD_SW_RESET_NOW);
+
+ host->xfer_mode &= MVSD_XFER_MODE_INT_CHK_EN;
+ mvsd_write(MVSD_XFER_MODE, host->xfer_mode);
+
+ host->intr_en &= MVSD_NOR_CARD_INT;
+ mvsd_write(MVSD_NOR_INTR_EN, host->intr_en);
+ mvsd_write(MVSD_ERR_INTR_EN, 0);
+ mvsd_write(MVSD_ERR_INTR_STATUS, 0xffff);
+
+ mrq->cmd->error = -ETIMEDOUT;
+ mvsd_finish_cmd(host, mrq->cmd, 0);
+ if (mrq->data) {
+ mrq->data->error = -ETIMEDOUT;
+ mvsd_finish_data(host, mrq->data, 0);
+ }
+ }
+ spin_unlock_irqrestore(&host->lock, flags);
+
+ if (mrq)
+ mmc_request_done(host->mmc, mrq);
+}
+
+static irqreturn_t mvsd_card_detect_irq(int irq, void *dev)
+{
+ struct mvsd_host *host = dev;
+ mmc_detect_change(host->mmc, msecs_to_jiffies(100));
+ return IRQ_HANDLED;
+}
+
+static void mvsd_enable_sdio_irq(struct mmc_host *mmc, int enable)
+{
+ struct mvsd_host *host = mmc_priv(mmc);
+ void __iomem *iobase = host->base;
+ unsigned long flags;
+
+ spin_lock_irqsave(&host->lock, flags);
+ if (enable) {
+ host->xfer_mode |= MVSD_XFER_MODE_INT_CHK_EN;
+ host->intr_en |= MVSD_NOR_CARD_INT;
+ } else {
+ host->xfer_mode &= ~MVSD_XFER_MODE_INT_CHK_EN;
+ host->intr_en &= ~MVSD_NOR_CARD_INT;
+ }
+ mvsd_write(MVSD_XFER_MODE, host->xfer_mode);
+ mvsd_write(MVSD_NOR_INTR_EN, host->intr_en);
+ spin_unlock_irqrestore(&host->lock, flags);
+}
+
+static int mvsd_get_ro(struct mmc_host *mmc)
+{
+ struct mvsd_host *host = mmc_priv(mmc);
+
+ if (host->gpio_write_protect)
+ return gpio_get_value(host->gpio_write_protect);
+
+ /*
+ * Board doesn't support read only detection; let the mmc core
+ * decide what to do.
+ */
+ return -ENOSYS;
+}
+
+static void mvsd_power_up(struct mvsd_host *host)
+{
+ void __iomem *iobase = host->base;
+ dev_dbg(host->dev, "power up\n");
+ mvsd_write(MVSD_NOR_INTR_EN, 0);
+ mvsd_write(MVSD_ERR_INTR_EN, 0);
+ mvsd_write(MVSD_SW_RESET, MVSD_SW_RESET_NOW);
+ mvsd_write(MVSD_XFER_MODE, 0);
+ mvsd_write(MVSD_NOR_STATUS_EN, 0xffff);
+ mvsd_write(MVSD_ERR_STATUS_EN, 0xffff);
+ mvsd_write(MVSD_NOR_INTR_STATUS, 0xffff);
+ mvsd_write(MVSD_ERR_INTR_STATUS, 0xffff);
+}
+
+static void mvsd_power_down(struct mvsd_host *host)
+{
+ void __iomem *iobase = host->base;
+ dev_dbg(host->dev, "power down\n");
+ mvsd_write(MVSD_NOR_INTR_EN, 0);
+ mvsd_write(MVSD_ERR_INTR_EN, 0);
+ mvsd_write(MVSD_SW_RESET, MVSD_SW_RESET_NOW);
+ mvsd_write(MVSD_XFER_MODE, MVSD_XFER_MODE_STOP_CLK);
+ mvsd_write(MVSD_NOR_STATUS_EN, 0);
+ mvsd_write(MVSD_ERR_STATUS_EN, 0);
+ mvsd_write(MVSD_NOR_INTR_STATUS, 0xffff);
+ mvsd_write(MVSD_ERR_INTR_STATUS, 0xffff);
+}
+
+static void mvsd_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
+{
+ struct mvsd_host *host = mmc_priv(mmc);
+ void __iomem *iobase = host->base;
+ u32 ctrl_reg = 0;
+
+ if (ios->power_mode == MMC_POWER_UP)
+ mvsd_power_up(host);
+
+ if (ios->clock == 0) {
+ mvsd_write(MVSD_XFER_MODE, MVSD_XFER_MODE_STOP_CLK);
+ mvsd_write(MVSD_CLK_DIV, MVSD_BASE_DIV_MAX);
+ host->clock = 0;
+ dev_dbg(host->dev, "clock off\n");
+ } else if (ios->clock != host->clock) {
+ u32 m = DIV_ROUND_UP(host->base_clock, ios->clock) - 1;
+ if (m > MVSD_BASE_DIV_MAX)
+ m = MVSD_BASE_DIV_MAX;
+ mvsd_write(MVSD_CLK_DIV, m);
+ host->clock = ios->clock;
+ host->ns_per_clk = 1000000000 / (host->base_clock / (m+1));
+ dev_dbg(host->dev, "clock=%d (%d), div=0x%04x\n",
+ ios->clock, host->base_clock / (m+1), m);
+ }
+
+ /* default transfer mode */
+ ctrl_reg |= MVSD_HOST_CTRL_BIG_ENDIAN;
+ ctrl_reg &= ~MVSD_HOST_CTRL_LSB_FIRST;
+
+ /* default to maximum timeout */
+ ctrl_reg |= MVSD_HOST_CTRL_TMOUT_MASK;
+ ctrl_reg |= MVSD_HOST_CTRL_TMOUT_EN;
+
+ if (ios->bus_mode == MMC_BUSMODE_PUSHPULL)
+ ctrl_reg |= MVSD_HOST_CTRL_PUSH_PULL_EN;
+
+ if (ios->bus_width == MMC_BUS_WIDTH_4)
+ ctrl_reg |= MVSD_HOST_CTRL_DATA_WIDTH_4_BITS;
+
+ if (ios->timing == MMC_TIMING_MMC_HS ||
+ ios->timing == MMC_TIMING_SD_HS)
+ ctrl_reg |= MVSD_HOST_CTRL_HI_SPEED_EN;
+
+ host->ctrl = ctrl_reg;
+ mvsd_write(MVSD_HOST_CTRL, ctrl_reg);
+ dev_dbg(host->dev, "ctrl 0x%04x: %s %s %s\n", ctrl_reg,
+ (ctrl_reg & MVSD_HOST_CTRL_PUSH_PULL_EN) ?
+ "push-pull" : "open-drain",
+ (ctrl_reg & MVSD_HOST_CTRL_DATA_WIDTH_4_BITS) ?
+ "4bit-width" : "1bit-width",
+ (ctrl_reg & MVSD_HOST_CTRL_HI_SPEED_EN) ?
+ "high-speed" : "");
+
+ if (ios->power_mode == MMC_POWER_OFF)
+ mvsd_power_down(host);
+}
+
+static const struct mmc_host_ops mvsd_ops = {
+ .request = mvsd_request,
+ .get_ro = mvsd_get_ro,
+ .set_ios = mvsd_set_ios,
+ .enable_sdio_irq = mvsd_enable_sdio_irq,
+};
+
+static void __init mv_conf_mbus_windows(struct mvsd_host *host,
+ struct mbus_dram_target_info *dram)
+{
+ void __iomem *iobase = host->base;
+ int i;
+
+ for (i = 0; i < 4; i++) {
+ writel(0, iobase + MVSD_WINDOW_CTRL(i));
+ writel(0, iobase + MVSD_WINDOW_BASE(i));
+ }
+
+ for (i = 0; i < dram->num_cs; i++) {
+ struct mbus_dram_window *cs = dram->cs + i;
+ writel(((cs->size - 1) & 0xffff0000) |
+ (cs->mbus_attr << 8) |
+ (dram->mbus_dram_target_id << 4) | 1,
+ iobase + MVSD_WINDOW_CTRL(i));
+ writel(cs->base, iobase + MVSD_WINDOW_BASE(i));
+ }
+}
+
+static int __init mvsd_probe(struct platform_device *pdev)
+{
+ struct mmc_host *mmc = NULL;
+ struct mvsd_host *host = NULL;
+ const struct mvsdio_platform_data *mvsd_data;
+ struct resource *r;
+ int ret, irq;
+
+ r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ irq = platform_get_irq(pdev, 0);
+ mvsd_data = pdev->dev.platform_data;
+ if (!r || irq < 0 || !mvsd_data)
+ return -ENXIO;
+
+ r = request_mem_region(r->start, SZ_1K, DRIVER_NAME);
+ if (!r)
+ return -EBUSY;
+
+ mmc = mmc_alloc_host(sizeof(struct mvsd_host), &pdev->dev);
+ if (!mmc) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ host = mmc_priv(mmc);
+ host->mmc = mmc;
+ host->dev = &pdev->dev;
+ host->res = r;
+ host->base_clock = mvsd_data->clock / 2;
+
+ mmc->ops = &mvsd_ops;
+
+ mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
+ mmc->caps = MMC_CAP_4_BIT_DATA | MMC_CAP_SDIO_IRQ |
+ MMC_CAP_SD_HIGHSPEED | MMC_CAP_MMC_HIGHSPEED;
+
+ mmc->f_min = DIV_ROUND_UP(host->base_clock, MVSD_BASE_DIV_MAX);
+ mmc->f_max = maxfreq;
+
+ mmc->max_blk_size = 2048;
+ mmc->max_blk_count = 65535;
+
+ mmc->max_hw_segs = 1;
+ mmc->max_phys_segs = 1;
+ mmc->max_seg_size = mmc->max_blk_size * mmc->max_blk_count;
+ mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
+
+ spin_lock_init(&host->lock);
+
+ host->base = ioremap(r->start, SZ_4K);
+ if (!host->base) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ /* (Re-)program MBUS remapping windows if we are asked to. */
+ if (mvsd_data->dram != NULL)
+ mv_conf_mbus_windows(host, mvsd_data->dram);
+
+ mvsd_power_down(host);
+
+ ret = request_irq(irq, mvsd_irq, 0, DRIVER_NAME, host);
+ if (ret) {
+ printk(KERN_ERR "%s: cannot assign irq %d\n", DRIVER_NAME, irq);
+ goto out;
+ } else
+ host->irq = irq;
+
+ if (mvsd_data->gpio_card_detect) {
+ ret = gpio_request(mvsd_data->gpio_card_detect,
+ DRIVER_NAME " cd");
+ if (ret == 0) {
+ gpio_direction_input(mvsd_data->gpio_card_detect);
+ irq = gpio_to_irq(mvsd_data->gpio_card_detect);
+ ret = request_irq(irq, mvsd_card_detect_irq,
+ IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING,
+ DRIVER_NAME " cd", host);
+ if (ret == 0)
+ host->gpio_card_detect =
+ mvsd_data->gpio_card_detect;
+ else
+ gpio_free(mvsd_data->gpio_card_detect);
+ }
+ }
+ if (!host->gpio_card_detect)
+ mmc->caps |= MMC_CAP_NEEDS_POLL;
+
+ if (mvsd_data->gpio_write_protect) {
+ ret = gpio_request(mvsd_data->gpio_write_protect,
+ DRIVER_NAME " wp");
+ if (ret == 0) {
+ gpio_direction_input(mvsd_data->gpio_write_protect);
+ host->gpio_write_protect =
+ mvsd_data->gpio_write_protect;
+ }
+ }
+
+ setup_timer(&host->timer, mvsd_timeout_timer, (unsigned long)host);
+ platform_set_drvdata(pdev, mmc);
+ ret = mmc_add_host(mmc);
+ if (ret)
+ goto out;
+
+ printk(KERN_NOTICE "%s: %s driver initialized, ",
+ mmc_hostname(mmc), DRIVER_NAME);
+ if (host->gpio_card_detect)
+ printk("using GPIO %d for card detection\n",
+ host->gpio_card_detect);
+ else
+ printk("lacking card detect (fall back to polling)\n");
+ return 0;
+
+out:
+ if (host) {
+ if (host->irq)
+ free_irq(host->irq, host);
+ if (host->gpio_card_detect) {
+ free_irq(gpio_to_irq(host->gpio_card_detect), host);
+ gpio_free(host->gpio_card_detect);
+ }
+ if (host->gpio_write_protect)
+ gpio_free(host->gpio_write_protect);
+ if (host->base)
+ iounmap(host->base);
+ }
+ if (r)
+ release_resource(r);
+ if (mmc)
+ mmc_free_host(mmc);
+
+ return ret;
+}
+
+static int __exit mvsd_remove(struct platform_device *pdev)
+{
+ struct mmc_host *mmc = platform_get_drvdata(pdev);
+
+ if (mmc) {
+ struct mvsd_host *host = mmc_priv(mmc);
+
+ if (host->gpio_card_detect) {
+ free_irq(gpio_to_irq(host->gpio_card_detect), host);
+ gpio_free(host->gpio_card_detect);
+ }
+ mmc_remove_host(mmc);
+ free_irq(host->irq, host);
+ if (host->gpio_write_protect)
+ gpio_free(host->gpio_write_protect);
+ del_timer_sync(&host->timer);
+ mvsd_power_down(host);
+ iounmap(host->base);
+ release_resource(host->res);
+ mmc_free_host(mmc);
+ }
+ platform_set_drvdata(pdev, NULL);
+ return 0;
+}
+
+#ifdef CONFIG_PM
+static int mvsd_suspend(struct platform_device *dev, pm_message_t state,
+ u32 level)
+{
+ struct mmc_host *mmc = platform_get_drvdata(dev);
+ int ret = 0;
+
+ if (mmc && level == SUSPEND_DISABLE)
+ ret = mmc_suspend_host(mmc, state);
+
+ return ret;
+}
+
+static int mvsd_resume(struct platform_device *dev, u32 level)
+{
+ struct mmc_host *mmc = platform_dev_get_drvdata(dev);
+ int ret = 0;
+
+ if (mmc && level == RESUME_ENABLE)
+ ret = mmc_resume_host(mmc);
+
+ return ret;
+}
+#else
+#define mvsd_suspend NULL
+#define mvsd_resume NULL
+#endif
+
+static struct platform_driver mvsd_driver = {
+ .remove = __exit_p(mvsd_remove),
+ .suspend = mvsd_suspend,
+ .resume = mvsd_resume,
+ .driver = {
+ .name = DRIVER_NAME,
+ },
+};
+
+static int __init mvsd_init(void)
+{
+ return platform_driver_probe(&mvsd_driver, mvsd_probe);
+}
+
+static void __exit mvsd_exit(void)
+{
+ platform_driver_unregister(&mvsd_driver);
+}
+
+module_init(mvsd_init);
+module_exit(mvsd_exit);
+
+/* maximum card clock frequency (default 50MHz) */
+module_param(maxfreq, int, 0);
+
+/* force PIO transfers all the time */
+module_param(nodma, int, 0);
+
+MODULE_AUTHOR("Maen Suleiman, Nicolas Pitre");
+MODULE_DESCRIPTION("Marvell MMC,SD,SDIO Host Controller driver");
+MODULE_LICENSE("GPL");
projects / GitHub / MotorolaMobilityLLC / kernel-slsi.git / commitdiff