+++ /dev/null
-/*
- * Sequencer Serial Port (SSP) driver for Texas Instruments' SoCs
- *
- * Copyright (C) 2010 Texas Instruments Inc
- *
- * 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/errno.h>
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/slab.h>
-#include <linux/err.h>
-#include <linux/wait.h>
-#include <linux/clk.h>
-#include <linux/interrupt.h>
-#include <linux/device.h>
-#include <linux/spinlock.h>
-#include <linux/platform_device.h>
-#include <linux/delay.h>
-#include <linux/io.h>
-#include <linux/sched.h>
-#include <linux/mfd/core.h>
-#include <linux/mfd/ti_ssp.h>
-
-/* Register Offsets */
-#define REG_REV 0x00
-#define REG_IOSEL_1 0x04
-#define REG_IOSEL_2 0x08
-#define REG_PREDIV 0x0c
-#define REG_INTR_ST 0x10
-#define REG_INTR_EN 0x14
-#define REG_TEST_CTRL 0x18
-
-/* Per port registers */
-#define PORT_CFG_2 0x00
-#define PORT_ADDR 0x04
-#define PORT_DATA 0x08
-#define PORT_CFG_1 0x0c
-#define PORT_STATE 0x10
-
-#define SSP_PORT_CONFIG_MASK (SSP_EARLY_DIN | SSP_DELAY_DOUT)
-#define SSP_PORT_CLKRATE_MASK 0x0f
-
-#define SSP_SEQRAM_WR_EN BIT(4)
-#define SSP_SEQRAM_RD_EN BIT(5)
-#define SSP_START BIT(15)
-#define SSP_BUSY BIT(10)
-#define SSP_PORT_ASL BIT(7)
-#define SSP_PORT_CFO1 BIT(6)
-
-#define SSP_PORT_SEQRAM_SIZE 32
-
-static const int ssp_port_base[] = {0x040, 0x080};
-static const int ssp_port_seqram[] = {0x100, 0x180};
-
-struct ti_ssp {
- struct resource *res;
- struct device *dev;
- void __iomem *regs;
- spinlock_t lock;
- struct clk *clk;
- int irq;
- wait_queue_head_t wqh;
-
- /*
- * Some of the iosel2 register bits always read-back as 0, we need to
- * remember these values so that we don't clobber previously set
- * values.
- */
- u32 iosel2;
-};
-
-static inline struct ti_ssp *dev_to_ssp(struct device *dev)
-{
- return dev_get_drvdata(dev->parent);
-}
-
-static inline int dev_to_port(struct device *dev)
-{
- return to_platform_device(dev)->id;
-}
-
-/* Register Access Helpers, rmw() functions need to run locked */
-static inline u32 ssp_read(struct ti_ssp *ssp, int reg)
-{
- return __raw_readl(ssp->regs + reg);
-}
-
-static inline void ssp_write(struct ti_ssp *ssp, int reg, u32 val)
-{
- __raw_writel(val, ssp->regs + reg);
-}
-
-static inline void ssp_rmw(struct ti_ssp *ssp, int reg, u32 mask, u32 bits)
-{
- ssp_write(ssp, reg, (ssp_read(ssp, reg) & ~mask) | bits);
-}
-
-static inline u32 ssp_port_read(struct ti_ssp *ssp, int port, int reg)
-{
- return ssp_read(ssp, ssp_port_base[port] + reg);
-}
-
-static inline void ssp_port_write(struct ti_ssp *ssp, int port, int reg,
- u32 val)
-{
- ssp_write(ssp, ssp_port_base[port] + reg, val);
-}
-
-static inline void ssp_port_rmw(struct ti_ssp *ssp, int port, int reg,
- u32 mask, u32 bits)
-{
- ssp_rmw(ssp, ssp_port_base[port] + reg, mask, bits);
-}
-
-static inline void ssp_port_clr_bits(struct ti_ssp *ssp, int port, int reg,
- u32 bits)
-{
- ssp_port_rmw(ssp, port, reg, bits, 0);
-}
-
-static inline void ssp_port_set_bits(struct ti_ssp *ssp, int port, int reg,
- u32 bits)
-{
- ssp_port_rmw(ssp, port, reg, 0, bits);
-}
-
-/* Called to setup port clock mode, caller must hold ssp->lock */
-static int __set_mode(struct ti_ssp *ssp, int port, int mode)
-{
- mode &= SSP_PORT_CONFIG_MASK;
- ssp_port_rmw(ssp, port, PORT_CFG_1, SSP_PORT_CONFIG_MASK, mode);
-
- return 0;
-}
-
-int ti_ssp_set_mode(struct device *dev, int mode)
-{
- struct ti_ssp *ssp = dev_to_ssp(dev);
- int port = dev_to_port(dev);
- int ret;
-
- spin_lock(&ssp->lock);
- ret = __set_mode(ssp, port, mode);
- spin_unlock(&ssp->lock);
-
- return ret;
-}
-EXPORT_SYMBOL(ti_ssp_set_mode);
-
-/* Called to setup iosel2, caller must hold ssp->lock */
-static void __set_iosel2(struct ti_ssp *ssp, u32 mask, u32 val)
-{
- ssp->iosel2 = (ssp->iosel2 & ~mask) | val;
- ssp_write(ssp, REG_IOSEL_2, ssp->iosel2);
-}
-
-/* Called to setup port iosel, caller must hold ssp->lock */
-static void __set_iosel(struct ti_ssp *ssp, int port, u32 iosel)
-{
- unsigned val, shift = port ? 16 : 0;
-
- /* IOSEL1 gets the least significant 16 bits */
- val = ssp_read(ssp, REG_IOSEL_1);
- val &= 0xffff << (port ? 0 : 16);
- val |= (iosel & 0xffff) << (port ? 16 : 0);
- ssp_write(ssp, REG_IOSEL_1, val);
-
- /* IOSEL2 gets the most significant 16 bits */
- val = (iosel >> 16) & 0x7;
- __set_iosel2(ssp, 0x7 << shift, val << shift);
-}
-
-int ti_ssp_set_iosel(struct device *dev, u32 iosel)
-{
- struct ti_ssp *ssp = dev_to_ssp(dev);
- int port = dev_to_port(dev);
-
- spin_lock(&ssp->lock);
- __set_iosel(ssp, port, iosel);
- spin_unlock(&ssp->lock);
-
- return 0;
-}
-EXPORT_SYMBOL(ti_ssp_set_iosel);
-
-int ti_ssp_load(struct device *dev, int offs, u32* prog, int len)
-{
- struct ti_ssp *ssp = dev_to_ssp(dev);
- int port = dev_to_port(dev);
- int i;
-
- if (len > SSP_PORT_SEQRAM_SIZE)
- return -ENOSPC;
-
- spin_lock(&ssp->lock);
-
- /* Enable SeqRAM access */
- ssp_port_set_bits(ssp, port, PORT_CFG_2, SSP_SEQRAM_WR_EN);
-
- /* Copy code */
- for (i = 0; i < len; i++) {
- __raw_writel(prog[i], ssp->regs + offs + 4*i +
- ssp_port_seqram[port]);
- }
-
- /* Disable SeqRAM access */
- ssp_port_clr_bits(ssp, port, PORT_CFG_2, SSP_SEQRAM_WR_EN);
-
- spin_unlock(&ssp->lock);
-
- return 0;
-}
-EXPORT_SYMBOL(ti_ssp_load);
-
-int ti_ssp_raw_read(struct device *dev)
-{
- struct ti_ssp *ssp = dev_to_ssp(dev);
- int port = dev_to_port(dev);
- int shift = port ? 27 : 11;
-
- return (ssp_read(ssp, REG_IOSEL_2) >> shift) & 0xf;
-}
-EXPORT_SYMBOL(ti_ssp_raw_read);
-
-int ti_ssp_raw_write(struct device *dev, u32 val)
-{
- struct ti_ssp *ssp = dev_to_ssp(dev);
- int port = dev_to_port(dev), shift;
-
- spin_lock(&ssp->lock);
-
- shift = port ? 22 : 6;
- val &= 0xf;
- __set_iosel2(ssp, 0xf << shift, val << shift);
-
- spin_unlock(&ssp->lock);
-
- return 0;
-}
-EXPORT_SYMBOL(ti_ssp_raw_write);
-
-static inline int __xfer_done(struct ti_ssp *ssp, int port)
-{
- return !(ssp_port_read(ssp, port, PORT_CFG_1) & SSP_BUSY);
-}
-
-int ti_ssp_run(struct device *dev, u32 pc, u32 input, u32 *output)
-{
- struct ti_ssp *ssp = dev_to_ssp(dev);
- int port = dev_to_port(dev);
- int ret;
-
- if (pc & ~(0x3f))
- return -EINVAL;
-
- /* Grab ssp->lock to serialize rmw on ssp registers */
- spin_lock(&ssp->lock);
-
- ssp_port_write(ssp, port, PORT_ADDR, input >> 16);
- ssp_port_write(ssp, port, PORT_DATA, input & 0xffff);
- ssp_port_rmw(ssp, port, PORT_CFG_1, 0x3f, pc);
-
- /* grab wait queue head lock to avoid race with the isr */
- spin_lock_irq(&ssp->wqh.lock);
-
- /* kick off sequence execution in hardware */
- ssp_port_set_bits(ssp, port, PORT_CFG_1, SSP_START);
-
- /* drop ssp lock; no register writes beyond this */
- spin_unlock(&ssp->lock);
-
- ret = wait_event_interruptible_locked_irq(ssp->wqh,
- __xfer_done(ssp, port));
- spin_unlock_irq(&ssp->wqh.lock);
-
- if (ret < 0)
- return ret;
-
- if (output) {
- *output = (ssp_port_read(ssp, port, PORT_ADDR) << 16) |
- (ssp_port_read(ssp, port, PORT_DATA) & 0xffff);
- }
-
- ret = ssp_port_read(ssp, port, PORT_STATE) & 0x3f; /* stop address */
-
- return ret;
-}
-EXPORT_SYMBOL(ti_ssp_run);
-
-static irqreturn_t ti_ssp_interrupt(int irq, void *dev_data)
-{
- struct ti_ssp *ssp = dev_data;
-
- spin_lock(&ssp->wqh.lock);
-
- ssp_write(ssp, REG_INTR_ST, 0x3);
- wake_up_locked(&ssp->wqh);
-
- spin_unlock(&ssp->wqh.lock);
-
- return IRQ_HANDLED;
-}
-
-static int ti_ssp_probe(struct platform_device *pdev)
-{
- static struct ti_ssp *ssp;
- const struct ti_ssp_data *pdata = dev_get_platdata(&pdev->dev);
- int error = 0, prediv = 0xff, id;
- unsigned long sysclk;
- struct device *dev = &pdev->dev;
- struct mfd_cell cells[2];
-
- ssp = kzalloc(sizeof(*ssp), GFP_KERNEL);
- if (!ssp) {
- dev_err(dev, "cannot allocate device info\n");
- return -ENOMEM;
- }
-
- ssp->dev = dev;
- dev_set_drvdata(dev, ssp);
-
- ssp->res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- if (!ssp->res) {
- error = -ENODEV;
- dev_err(dev, "cannot determine register area\n");
- goto error_res;
- }
-
- if (!request_mem_region(ssp->res->start, resource_size(ssp->res),
- pdev->name)) {
- error = -ENOMEM;
- dev_err(dev, "cannot claim register memory\n");
- goto error_res;
- }
-
- ssp->regs = ioremap(ssp->res->start, resource_size(ssp->res));
- if (!ssp->regs) {
- error = -ENOMEM;
- dev_err(dev, "cannot map register memory\n");
- goto error_map;
- }
-
- ssp->clk = clk_get(dev, NULL);
- if (IS_ERR(ssp->clk)) {
- error = PTR_ERR(ssp->clk);
- dev_err(dev, "cannot claim device clock\n");
- goto error_clk;
- }
-
- ssp->irq = platform_get_irq(pdev, 0);
- if (ssp->irq < 0) {
- error = -ENODEV;
- dev_err(dev, "unknown irq\n");
- goto error_irq;
- }
-
- error = request_threaded_irq(ssp->irq, NULL, ti_ssp_interrupt, 0,
- dev_name(dev), ssp);
- if (error < 0) {
- dev_err(dev, "cannot acquire irq\n");
- goto error_irq;
- }
-
- spin_lock_init(&ssp->lock);
- init_waitqueue_head(&ssp->wqh);
-
- /* Power on and initialize SSP */
- error = clk_enable(ssp->clk);
- if (error) {
- dev_err(dev, "cannot enable device clock\n");
- goto error_enable;
- }
-
- /* Reset registers to a sensible known state */
- ssp_write(ssp, REG_IOSEL_1, 0);
- ssp_write(ssp, REG_IOSEL_2, 0);
- ssp_write(ssp, REG_INTR_EN, 0x3);
- ssp_write(ssp, REG_INTR_ST, 0x3);
- ssp_write(ssp, REG_TEST_CTRL, 0);
- ssp_port_write(ssp, 0, PORT_CFG_1, SSP_PORT_ASL);
- ssp_port_write(ssp, 1, PORT_CFG_1, SSP_PORT_ASL);
- ssp_port_write(ssp, 0, PORT_CFG_2, SSP_PORT_CFO1);
- ssp_port_write(ssp, 1, PORT_CFG_2, SSP_PORT_CFO1);
-
- sysclk = clk_get_rate(ssp->clk);
- if (pdata && pdata->out_clock)
- prediv = (sysclk / pdata->out_clock) - 1;
- prediv = clamp(prediv, 0, 0xff);
- ssp_rmw(ssp, REG_PREDIV, 0xff, prediv);
-
- memset(cells, 0, sizeof(cells));
- for (id = 0; id < 2; id++) {
- const struct ti_ssp_dev_data *data = &pdata->dev_data[id];
-
- cells[id].id = id;
- cells[id].name = data->dev_name;
- cells[id].platform_data = data->pdata;
- }
-
- error = mfd_add_devices(dev, 0, cells, 2, NULL, 0, NULL);
- if (error < 0) {
- dev_err(dev, "cannot add mfd cells\n");
- goto error_enable;
- }
-
- return 0;
-
-error_enable:
- free_irq(ssp->irq, ssp);
-error_irq:
- clk_put(ssp->clk);
-error_clk:
- iounmap(ssp->regs);
-error_map:
- release_mem_region(ssp->res->start, resource_size(ssp->res));
-error_res:
- kfree(ssp);
- return error;
-}
-
-static int ti_ssp_remove(struct platform_device *pdev)
-{
- struct device *dev = &pdev->dev;
- struct ti_ssp *ssp = dev_get_drvdata(dev);
-
- mfd_remove_devices(dev);
- clk_disable(ssp->clk);
- free_irq(ssp->irq, ssp);
- clk_put(ssp->clk);
- iounmap(ssp->regs);
- release_mem_region(ssp->res->start, resource_size(ssp->res));
- kfree(ssp);
- return 0;
-}
-
-static struct platform_driver ti_ssp_driver = {
- .probe = ti_ssp_probe,
- .remove = ti_ssp_remove,
- .driver = {
- .name = "ti-ssp",
- .owner = THIS_MODULE,
- }
-};
-
-module_platform_driver(ti_ssp_driver);
-
-MODULE_DESCRIPTION("Sequencer Serial Port (SSP) Driver");
-MODULE_AUTHOR("Cyril Chemparathy");
-MODULE_LICENSE("GPL");
-MODULE_ALIAS("platform:ti-ssp");
projects / GitHub / LineageOS / android_kernel_motorola_exynos9610.git / commitdiff