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linux/drivers/i2c/busses/i2c-mxs.c
Marek Vasut cd4f2d4aa7 i2c: mxs: Set I2C timing registers for mxs-i2c 
This patch configures the I2C bus timing registers according
to information passed via DT. Currently, 100kHz and 400kHz
modes are supported.

The TIMING2 register value is wrong in the documentation for
i.MX28! This was found and fixed by:
  Shawn Guo <shawn.guo@linaro.org>

Signed-off-by: Marek Vasut <marex@denx.de>
Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
2012-07-13 10:33:42 +02:00

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/*
* Freescale MXS I2C bus driver
*
* Copyright (C) 2011 Wolfram Sang, Pengutronix e.K.
*
* based on a (non-working) driver which was:
*
* Copyright (C) 2009-2010 Freescale Semiconductor, Inc. All Rights Reserved.
*
* TODO: add dma-support if platform-support for it is available
*
* 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.
*
*/
#include <linux/slab.h>
#include <linux/device.h>
#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/err.h>
#include <linux/interrupt.h>
#include <linux/completion.h>
#include <linux/platform_device.h>
#include <linux/jiffies.h>
#include <linux/io.h>
#include <linux/pinctrl/consumer.h>
#include <linux/stmp_device.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/of_i2c.h>
#define DRIVER_NAME "mxs-i2c"
#define MXS_I2C_CTRL0 (0x00)
#define MXS_I2C_CTRL0_SET (0x04)
#define MXS_I2C_CTRL0_SFTRST 0x80000000
#define MXS_I2C_CTRL0_SEND_NAK_ON_LAST 0x02000000
#define MXS_I2C_CTRL0_RETAIN_CLOCK 0x00200000
#define MXS_I2C_CTRL0_POST_SEND_STOP 0x00100000
#define MXS_I2C_CTRL0_PRE_SEND_START 0x00080000
#define MXS_I2C_CTRL0_MASTER_MODE 0x00020000
#define MXS_I2C_CTRL0_DIRECTION 0x00010000
#define MXS_I2C_CTRL0_XFER_COUNT(v) ((v) & 0x0000FFFF)
#define MXS_I2C_TIMING0 (0x10)
#define MXS_I2C_TIMING1 (0x20)
#define MXS_I2C_TIMING2 (0x30)
#define MXS_I2C_CTRL1 (0x40)
#define MXS_I2C_CTRL1_SET (0x44)
#define MXS_I2C_CTRL1_CLR (0x48)
#define MXS_I2C_CTRL1_BUS_FREE_IRQ 0x80
#define MXS_I2C_CTRL1_DATA_ENGINE_CMPLT_IRQ 0x40
#define MXS_I2C_CTRL1_NO_SLAVE_ACK_IRQ 0x20
#define MXS_I2C_CTRL1_OVERSIZE_XFER_TERM_IRQ 0x10
#define MXS_I2C_CTRL1_EARLY_TERM_IRQ 0x08
#define MXS_I2C_CTRL1_MASTER_LOSS_IRQ 0x04
#define MXS_I2C_CTRL1_SLAVE_STOP_IRQ 0x02
#define MXS_I2C_CTRL1_SLAVE_IRQ 0x01
#define MXS_I2C_IRQ_MASK (MXS_I2C_CTRL1_DATA_ENGINE_CMPLT_IRQ | \
MXS_I2C_CTRL1_NO_SLAVE_ACK_IRQ | \
MXS_I2C_CTRL1_EARLY_TERM_IRQ | \
MXS_I2C_CTRL1_MASTER_LOSS_IRQ | \
MXS_I2C_CTRL1_SLAVE_STOP_IRQ | \
MXS_I2C_CTRL1_SLAVE_IRQ)
#define MXS_I2C_QUEUECTRL (0x60)
#define MXS_I2C_QUEUECTRL_SET (0x64)
#define MXS_I2C_QUEUECTRL_CLR (0x68)
#define MXS_I2C_QUEUECTRL_QUEUE_RUN 0x20
#define MXS_I2C_QUEUECTRL_PIO_QUEUE_MODE 0x04
#define MXS_I2C_QUEUESTAT (0x70)
#define MXS_I2C_QUEUESTAT_RD_QUEUE_EMPTY 0x00002000
#define MXS_I2C_QUEUESTAT_WRITE_QUEUE_CNT_MASK 0x0000001F
#define MXS_I2C_QUEUECMD (0x80)
#define MXS_I2C_QUEUEDATA (0x90)
#define MXS_I2C_DATA (0xa0)
#define MXS_CMD_I2C_SELECT (MXS_I2C_CTRL0_RETAIN_CLOCK | \
MXS_I2C_CTRL0_PRE_SEND_START | \
MXS_I2C_CTRL0_MASTER_MODE | \
MXS_I2C_CTRL0_DIRECTION | \
MXS_I2C_CTRL0_XFER_COUNT(1))
#define MXS_CMD_I2C_WRITE (MXS_I2C_CTRL0_PRE_SEND_START | \
MXS_I2C_CTRL0_MASTER_MODE | \
MXS_I2C_CTRL0_DIRECTION)
#define MXS_CMD_I2C_READ (MXS_I2C_CTRL0_SEND_NAK_ON_LAST | \
MXS_I2C_CTRL0_MASTER_MODE)
struct mxs_i2c_speed_config {
uint32_t timing0;
uint32_t timing1;
uint32_t timing2;
};
/*
* Timing values for the default 24MHz clock supplied into the i2c block.
*
* The bus can operate at 95kHz or at 400kHz with the following timing
* register configurations. The 100kHz mode isn't present because it's
* values are not stated in the i.MX233/i.MX28 datasheet. The 95kHz mode
* shall be close enough replacement. Therefore when the bus is configured
* for 100kHz operation, 95kHz timing settings are actually loaded.
*
* For details, see i.MX233 [25.4.2 - 25.4.4] and i.MX28 [27.5.2 - 27.5.4].
*/
static const struct mxs_i2c_speed_config mxs_i2c_95kHz_config = {
.timing0 = 0x00780030,
.timing1 = 0x00800030,
.timing2 = 0x00300030,
};
static const struct mxs_i2c_speed_config mxs_i2c_400kHz_config = {
.timing0 = 0x000f0007,
.timing1 = 0x001f000f,
.timing2 = 0x00300030,
};
/**
* struct mxs_i2c_dev - per device, private MXS-I2C data
*
* @dev: driver model device node
* @regs: IO registers pointer
* @cmd_complete: completion object for transaction wait
* @cmd_err: error code for last transaction
* @adapter: i2c subsystem adapter node
*/
struct mxs_i2c_dev {
struct device *dev;
void __iomem *regs;
struct completion cmd_complete;
u32 cmd_err;
struct i2c_adapter adapter;
const struct mxs_i2c_speed_config *speed;
};
static void mxs_i2c_reset(struct mxs_i2c_dev *i2c)
{
stmp_reset_block(i2c->regs);
writel(i2c->speed->timing0, i2c->regs + MXS_I2C_TIMING0);
writel(i2c->speed->timing1, i2c->regs + MXS_I2C_TIMING1);
writel(i2c->speed->timing2, i2c->regs + MXS_I2C_TIMING2);
writel(MXS_I2C_IRQ_MASK << 8, i2c->regs + MXS_I2C_CTRL1_SET);
writel(MXS_I2C_QUEUECTRL_PIO_QUEUE_MODE,
i2c->regs + MXS_I2C_QUEUECTRL_SET);
}
static void mxs_i2c_pioq_setup_read(struct mxs_i2c_dev *i2c, u8 addr, int len,
int flags)
{
u32 data;
writel(MXS_CMD_I2C_SELECT, i2c->regs + MXS_I2C_QUEUECMD);
data = (addr << 1) | I2C_SMBUS_READ;
writel(data, i2c->regs + MXS_I2C_DATA);
data = MXS_CMD_I2C_READ | MXS_I2C_CTRL0_XFER_COUNT(len) | flags;
writel(data, i2c->regs + MXS_I2C_QUEUECMD);
}
static void mxs_i2c_pioq_setup_write(struct mxs_i2c_dev *i2c,
u8 addr, u8 *buf, int len, int flags)
{
u32 data;
int i, shifts_left;
data = MXS_CMD_I2C_WRITE | MXS_I2C_CTRL0_XFER_COUNT(len + 1) | flags;
writel(data, i2c->regs + MXS_I2C_QUEUECMD);
/*
* We have to copy the slave address (u8) and buffer (arbitrary number
* of u8) into the data register (u32). To achieve that, the u8 are put
* into the MSBs of 'data' which is then shifted for the next u8. When
* appropriate, 'data' is written to MXS_I2C_DATA. So, the first u32
* looks like this:
*
* 3 2 1 0
* 10987654|32109876|54321098|76543210
* --------+--------+--------+--------
* buffer+2|buffer+1|buffer+0|slave_addr
*/
data = ((addr << 1) | I2C_SMBUS_WRITE) << 24;
for (i = 0; i < len; i++) {
data >>= 8;
data |= buf[i] << 24;
if ((i & 3) == 2)
writel(data, i2c->regs + MXS_I2C_DATA);
}
/* Write out the remaining bytes if any */
shifts_left = 24 - (i & 3) * 8;
if (shifts_left)
writel(data >> shifts_left, i2c->regs + MXS_I2C_DATA);
}
/*
* TODO: should be replaceable with a waitqueue and RD_QUEUE_IRQ (setting the
* rd_threshold to 1). Couldn't get this to work, though.
*/
static int mxs_i2c_wait_for_data(struct mxs_i2c_dev *i2c)
{
unsigned long timeout = jiffies + msecs_to_jiffies(1000);
while (readl(i2c->regs + MXS_I2C_QUEUESTAT)
& MXS_I2C_QUEUESTAT_RD_QUEUE_EMPTY) {
if (time_after(jiffies, timeout))
return -ETIMEDOUT;
cond_resched();
}
return 0;
}
static int mxs_i2c_finish_read(struct mxs_i2c_dev *i2c, u8 *buf, int len)
{
u32 uninitialized_var(data);
int i;
for (i = 0; i < len; i++) {
if ((i & 3) == 0) {
if (mxs_i2c_wait_for_data(i2c))
return -ETIMEDOUT;
data = readl(i2c->regs + MXS_I2C_QUEUEDATA);
}
buf[i] = data & 0xff;
data >>= 8;
}
return 0;
}
/*
* Low level master read/write transaction.
*/
static int mxs_i2c_xfer_msg(struct i2c_adapter *adap, struct i2c_msg *msg,
int stop)
{
struct mxs_i2c_dev *i2c = i2c_get_adapdata(adap);
int ret;
int flags;
dev_dbg(i2c->dev, "addr: 0x%04x, len: %d, flags: 0x%x, stop: %d\n",
msg->addr, msg->len, msg->flags, stop);
if (msg->len == 0)
return -EINVAL;
init_completion(&i2c->cmd_complete);
i2c->cmd_err = 0;
flags = stop ? MXS_I2C_CTRL0_POST_SEND_STOP : 0;
if (msg->flags & I2C_M_RD)
mxs_i2c_pioq_setup_read(i2c, msg->addr, msg->len, flags);
else
mxs_i2c_pioq_setup_write(i2c, msg->addr, msg->buf, msg->len,
flags);
writel(MXS_I2C_QUEUECTRL_QUEUE_RUN,
i2c->regs + MXS_I2C_QUEUECTRL_SET);
ret = wait_for_completion_timeout(&i2c->cmd_complete,
msecs_to_jiffies(1000));
if (ret == 0)
goto timeout;
if ((!i2c->cmd_err) && (msg->flags & I2C_M_RD)) {
ret = mxs_i2c_finish_read(i2c, msg->buf, msg->len);
if (ret)
goto timeout;
}
if (i2c->cmd_err == -ENXIO)
mxs_i2c_reset(i2c);
else
writel(MXS_I2C_QUEUECTRL_QUEUE_RUN,
i2c->regs + MXS_I2C_QUEUECTRL_CLR);
dev_dbg(i2c->dev, "Done with err=%d\n", i2c->cmd_err);
return i2c->cmd_err;
timeout:
dev_dbg(i2c->dev, "Timeout!\n");
mxs_i2c_reset(i2c);
return -ETIMEDOUT;
}
static int mxs_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[],
int num)
{
int i;
int err;
for (i = 0; i < num; i++) {
err = mxs_i2c_xfer_msg(adap, &msgs[i], i == (num - 1));
if (err)
return err;
}
return num;
}
static u32 mxs_i2c_func(struct i2c_adapter *adap)
{
return I2C_FUNC_I2C | (I2C_FUNC_SMBUS_EMUL & ~I2C_FUNC_SMBUS_QUICK);
}
static irqreturn_t mxs_i2c_isr(int this_irq, void *dev_id)
{
struct mxs_i2c_dev *i2c = dev_id;
u32 stat = readl(i2c->regs + MXS_I2C_CTRL1) & MXS_I2C_IRQ_MASK;
bool is_last_cmd;
if (!stat)
return IRQ_NONE;
if (stat & MXS_I2C_CTRL1_NO_SLAVE_ACK_IRQ)
i2c->cmd_err = -ENXIO;
else if (stat & (MXS_I2C_CTRL1_EARLY_TERM_IRQ |
MXS_I2C_CTRL1_MASTER_LOSS_IRQ |
MXS_I2C_CTRL1_SLAVE_STOP_IRQ | MXS_I2C_CTRL1_SLAVE_IRQ))
/* MXS_I2C_CTRL1_OVERSIZE_XFER_TERM_IRQ is only for slaves */
i2c->cmd_err = -EIO;
is_last_cmd = (readl(i2c->regs + MXS_I2C_QUEUESTAT) &
MXS_I2C_QUEUESTAT_WRITE_QUEUE_CNT_MASK) == 0;
if (is_last_cmd || i2c->cmd_err)
complete(&i2c->cmd_complete);
writel(stat, i2c->regs + MXS_I2C_CTRL1_CLR);
return IRQ_HANDLED;
}
static const struct i2c_algorithm mxs_i2c_algo = {
.master_xfer = mxs_i2c_xfer,
.functionality = mxs_i2c_func,
};
static int mxs_i2c_get_ofdata(struct mxs_i2c_dev *i2c)
{
uint32_t speed;
struct device *dev = i2c->dev;
struct device_node *node = dev->of_node;
int ret;
if (!node)
return -EINVAL;
i2c->speed = &mxs_i2c_95kHz_config;
ret = of_property_read_u32(node, "clock-frequency", &speed);
if (ret)
dev_warn(dev, "No I2C speed selected, using 100kHz\n");
else if (speed == 400000)
i2c->speed = &mxs_i2c_400kHz_config;
else if (speed != 100000)
dev_warn(dev, "Unsupported I2C speed selected, using 100kHz\n");
return 0;
}
static int __devinit mxs_i2c_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct mxs_i2c_dev *i2c;
struct i2c_adapter *adap;
struct pinctrl *pinctrl;
struct resource *res;
resource_size_t res_size;
int err, irq;
pinctrl = devm_pinctrl_get_select_default(dev);
if (IS_ERR(pinctrl))
return PTR_ERR(pinctrl);
i2c = devm_kzalloc(dev, sizeof(struct mxs_i2c_dev), GFP_KERNEL);
if (!i2c)
return -ENOMEM;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res)
return -ENOENT;
res_size = resource_size(res);
if (!devm_request_mem_region(dev, res->start, res_size, res->name))
return -EBUSY;
i2c->regs = devm_ioremap_nocache(dev, res->start, res_size);
if (!i2c->regs)
return -EBUSY;
irq = platform_get_irq(pdev, 0);
if (irq < 0)
return irq;
err = devm_request_irq(dev, irq, mxs_i2c_isr, 0, dev_name(dev), i2c);
if (err)
return err;
i2c->dev = dev;
err = mxs_i2c_get_ofdata(i2c);
if (err)
return err;
platform_set_drvdata(pdev, i2c);
/* Do reset to enforce correct startup after pinmuxing */
mxs_i2c_reset(i2c);
adap = &i2c->adapter;
strlcpy(adap->name, "MXS I2C adapter", sizeof(adap->name));
adap->owner = THIS_MODULE;
adap->algo = &mxs_i2c_algo;
adap->dev.parent = dev;
adap->nr = pdev->id;
adap->dev.of_node = pdev->dev.of_node;
i2c_set_adapdata(adap, i2c);
err = i2c_add_numbered_adapter(adap);
if (err) {
dev_err(dev, "Failed to add adapter (%d)\n", err);
writel(MXS_I2C_CTRL0_SFTRST,
i2c->regs + MXS_I2C_CTRL0_SET);
return err;
}
of_i2c_register_devices(adap);
return 0;
}
static int __devexit mxs_i2c_remove(struct platform_device *pdev)
{
struct mxs_i2c_dev *i2c = platform_get_drvdata(pdev);
int ret;
ret = i2c_del_adapter(&i2c->adapter);
if (ret)
return -EBUSY;
writel(MXS_I2C_CTRL0_SFTRST, i2c->regs + MXS_I2C_CTRL0_SET);
platform_set_drvdata(pdev, NULL);
return 0;
}
static const struct of_device_id mxs_i2c_dt_ids[] = {
{ .compatible = "fsl,imx28-i2c", },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, mxs_i2c_dt_ids);
static struct platform_driver mxs_i2c_driver = {
.driver = {
.name = DRIVER_NAME,
.owner = THIS_MODULE,
.of_match_table = mxs_i2c_dt_ids,
},
.remove = __devexit_p(mxs_i2c_remove),
};
static int __init mxs_i2c_init(void)
{
return platform_driver_probe(&mxs_i2c_driver, mxs_i2c_probe);
}
subsys_initcall(mxs_i2c_init);
static void __exit mxs_i2c_exit(void)
{
platform_driver_unregister(&mxs_i2c_driver);
}
module_exit(mxs_i2c_exit);
MODULE_AUTHOR("Wolfram Sang <w.sang@pengutronix.de>");
MODULE_DESCRIPTION("MXS I2C Bus Driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:" DRIVER_NAME);
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