![Rafael J. Wysocki](/assets/img/avatar_default.png)
Make the PKUnity-v3 SoC I2C controller driver define its suspend callback through a struct dev_pm_ops object rather than by using a legacy PM hook in struct platform_driver. The empty resume callback is not necessary, so remove it. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Acked-by: Guan Xuetao <gxt@mprc.pku.edu.cn> Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
292 lines
6.3 KiB
C
292 lines
6.3 KiB
C
/*
|
|
* I2C driver for PKUnity-v3 SoC
|
|
* Code specific to PKUnity SoC and UniCore ISA
|
|
*
|
|
* Maintained by GUAN Xue-tao <gxt@mprc.pku.edu.cn>
|
|
* Copyright (C) 2001-2010 Guan Xuetao
|
|
*
|
|
* 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/kernel.h>
|
|
#include <linux/err.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/types.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/i2c.h>
|
|
#include <linux/init.h>
|
|
#include <linux/clk.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/io.h>
|
|
#include <mach/hardware.h>
|
|
|
|
/*
|
|
* Poll the i2c status register until the specified bit is set.
|
|
* Returns 0 if timed out (100 msec).
|
|
*/
|
|
static short poll_status(unsigned long bit)
|
|
{
|
|
int loop_cntr = 1000;
|
|
|
|
if (bit & I2C_STATUS_TFNF) {
|
|
do {
|
|
udelay(10);
|
|
} while (!(readl(I2C_STATUS) & bit) && (--loop_cntr > 0));
|
|
} else {
|
|
/* RXRDY handler */
|
|
do {
|
|
if (readl(I2C_TAR) == I2C_TAR_EEPROM)
|
|
msleep(20);
|
|
else
|
|
udelay(10);
|
|
} while (!(readl(I2C_RXFLR) & 0xf) && (--loop_cntr > 0));
|
|
}
|
|
|
|
return (loop_cntr > 0);
|
|
}
|
|
|
|
static int xfer_read(struct i2c_adapter *adap, unsigned char *buf, int length)
|
|
{
|
|
int i2c_reg = *buf;
|
|
|
|
/* Read data */
|
|
while (length--) {
|
|
if (!poll_status(I2C_STATUS_TFNF)) {
|
|
dev_dbg(&adap->dev, "Tx FIFO Not Full timeout\n");
|
|
return -ETIMEDOUT;
|
|
}
|
|
|
|
/* send addr */
|
|
writel(i2c_reg | I2C_DATACMD_WRITE, I2C_DATACMD);
|
|
|
|
/* get ready to next write */
|
|
i2c_reg++;
|
|
|
|
/* send read CMD */
|
|
writel(I2C_DATACMD_READ, I2C_DATACMD);
|
|
|
|
/* wait until the Rx FIFO have available */
|
|
if (!poll_status(I2C_STATUS_RFNE)) {
|
|
dev_dbg(&adap->dev, "RXRDY timeout\n");
|
|
return -ETIMEDOUT;
|
|
}
|
|
|
|
/* read the data to buf */
|
|
*buf = (readl(I2C_DATACMD) & I2C_DATACMD_DAT_MASK);
|
|
buf++;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int xfer_write(struct i2c_adapter *adap, unsigned char *buf, int length)
|
|
{
|
|
int i2c_reg = *buf;
|
|
|
|
/* Do nothing but storing the reg_num to a static variable */
|
|
if (i2c_reg == -1) {
|
|
printk(KERN_WARNING "Error i2c reg\n");
|
|
return -ETIMEDOUT;
|
|
}
|
|
|
|
if (length == 1)
|
|
return 0;
|
|
|
|
buf++;
|
|
length--;
|
|
while (length--) {
|
|
/* send addr */
|
|
writel(i2c_reg | I2C_DATACMD_WRITE, I2C_DATACMD);
|
|
|
|
/* send write CMD */
|
|
writel(*buf | I2C_DATACMD_WRITE, I2C_DATACMD);
|
|
|
|
/* wait until the Rx FIFO have available */
|
|
msleep(20);
|
|
|
|
/* read the data to buf */
|
|
i2c_reg++;
|
|
buf++;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Generic i2c master transfer entrypoint.
|
|
*
|
|
*/
|
|
static int puv3_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *pmsg,
|
|
int num)
|
|
{
|
|
int i, ret;
|
|
unsigned char swap;
|
|
|
|
/* Disable i2c */
|
|
writel(I2C_ENABLE_DISABLE, I2C_ENABLE);
|
|
|
|
/* Set the work mode and speed*/
|
|
writel(I2C_CON_MASTER | I2C_CON_SPEED_STD | I2C_CON_SLAVEDISABLE, I2C_CON);
|
|
|
|
writel(pmsg->addr, I2C_TAR);
|
|
|
|
/* Enable i2c */
|
|
writel(I2C_ENABLE_ENABLE, I2C_ENABLE);
|
|
|
|
dev_dbg(&adap->dev, "puv3_i2c_xfer: processing %d messages:\n", num);
|
|
|
|
for (i = 0; i < num; i++) {
|
|
dev_dbg(&adap->dev, " #%d: %sing %d byte%s %s 0x%02x\n", i,
|
|
pmsg->flags & I2C_M_RD ? "read" : "writ",
|
|
pmsg->len, pmsg->len > 1 ? "s" : "",
|
|
pmsg->flags & I2C_M_RD ? "from" : "to", pmsg->addr);
|
|
|
|
if (pmsg->len && pmsg->buf) { /* sanity check */
|
|
if (pmsg->flags & I2C_M_RD)
|
|
ret = xfer_read(adap, pmsg->buf, pmsg->len);
|
|
else
|
|
ret = xfer_write(adap, pmsg->buf, pmsg->len);
|
|
|
|
if (ret)
|
|
return ret;
|
|
|
|
}
|
|
dev_dbg(&adap->dev, "transfer complete\n");
|
|
pmsg++; /* next message */
|
|
}
|
|
|
|
/* XXX: fixup be16_to_cpu in bq27x00_battery.c */
|
|
if (pmsg->addr == I2C_TAR_PWIC) {
|
|
swap = pmsg->buf[0];
|
|
pmsg->buf[0] = pmsg->buf[1];
|
|
pmsg->buf[1] = swap;
|
|
}
|
|
|
|
return i;
|
|
}
|
|
|
|
/*
|
|
* Return list of supported functionality.
|
|
*/
|
|
static u32 puv3_i2c_func(struct i2c_adapter *adapter)
|
|
{
|
|
return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
|
|
}
|
|
|
|
static struct i2c_algorithm puv3_i2c_algorithm = {
|
|
.master_xfer = puv3_i2c_xfer,
|
|
.functionality = puv3_i2c_func,
|
|
};
|
|
|
|
/*
|
|
* Main initialization routine.
|
|
*/
|
|
static int __devinit puv3_i2c_probe(struct platform_device *pdev)
|
|
{
|
|
struct i2c_adapter *adapter;
|
|
struct resource *mem;
|
|
int rc;
|
|
|
|
mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
if (!mem)
|
|
return -ENODEV;
|
|
|
|
if (!request_mem_region(mem->start, resource_size(mem), "puv3_i2c"))
|
|
return -EBUSY;
|
|
|
|
adapter = kzalloc(sizeof(struct i2c_adapter), GFP_KERNEL);
|
|
if (adapter == NULL) {
|
|
dev_err(&pdev->dev, "can't allocate inteface!\n");
|
|
rc = -ENOMEM;
|
|
goto fail_nomem;
|
|
}
|
|
snprintf(adapter->name, sizeof(adapter->name), "PUV3-I2C at 0x%08x",
|
|
mem->start);
|
|
adapter->algo = &puv3_i2c_algorithm;
|
|
adapter->class = I2C_CLASS_HWMON;
|
|
adapter->dev.parent = &pdev->dev;
|
|
|
|
platform_set_drvdata(pdev, adapter);
|
|
|
|
adapter->nr = pdev->id;
|
|
rc = i2c_add_numbered_adapter(adapter);
|
|
if (rc) {
|
|
dev_err(&pdev->dev, "Adapter '%s' registration failed\n",
|
|
adapter->name);
|
|
goto fail_add_adapter;
|
|
}
|
|
|
|
dev_info(&pdev->dev, "PKUnity v3 i2c bus adapter.\n");
|
|
return 0;
|
|
|
|
fail_add_adapter:
|
|
platform_set_drvdata(pdev, NULL);
|
|
kfree(adapter);
|
|
fail_nomem:
|
|
release_mem_region(mem->start, resource_size(mem));
|
|
|
|
return rc;
|
|
}
|
|
|
|
static int __devexit puv3_i2c_remove(struct platform_device *pdev)
|
|
{
|
|
struct i2c_adapter *adapter = platform_get_drvdata(pdev);
|
|
struct resource *mem;
|
|
int rc;
|
|
|
|
rc = i2c_del_adapter(adapter);
|
|
if (rc) {
|
|
dev_err(&pdev->dev, "Adapter '%s' delete fail\n",
|
|
adapter->name);
|
|
return rc;
|
|
}
|
|
|
|
put_device(&pdev->dev);
|
|
platform_set_drvdata(pdev, NULL);
|
|
|
|
mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
release_mem_region(mem->start, resource_size(mem));
|
|
|
|
return rc;
|
|
}
|
|
|
|
#ifdef CONFIG_PM
|
|
static int puv3_i2c_suspend(struct device *dev)
|
|
{
|
|
int poll_count;
|
|
/* Disable the IIC */
|
|
writel(I2C_ENABLE_DISABLE, I2C_ENABLE);
|
|
for (poll_count = 0; poll_count < 50; poll_count++) {
|
|
if (readl(I2C_ENSTATUS) & I2C_ENSTATUS_ENABLE)
|
|
udelay(25);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static SIMPLE_DEV_PM_OPS(puv3_i2c_pm, puv3_i2c_suspend, NULL);
|
|
#define PUV3_I2C_PM (&puv3_i2c_pm)
|
|
|
|
#else
|
|
#define PUV3_I2C_PM NULL
|
|
#endif
|
|
|
|
static struct platform_driver puv3_i2c_driver = {
|
|
.probe = puv3_i2c_probe,
|
|
.remove = __devexit_p(puv3_i2c_remove),
|
|
.driver = {
|
|
.name = "PKUnity-v3-I2C",
|
|
.owner = THIS_MODULE,
|
|
.pm = PUV3_I2C_PM,
|
|
}
|
|
};
|
|
|
|
module_platform_driver(puv3_i2c_driver);
|
|
|
|
MODULE_DESCRIPTION("PKUnity v3 I2C driver");
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_ALIAS("platform:puv3_i2c");
|