mirror of
https://github.com/torvalds/linux.git
synced 2024-11-24 05:02:12 +00:00
unicore32 machine related files: add i2c bus drivers for pkunity-v3 soc
change from original version -- by advice of Jean Delvare 1. remove global variable i2c_reg, replaced by local variables 2. replace ENXIO with ENODEV when no platform resources 3. add adapter->nr assignment before i2c_add_numbered_adapter() call 4. add judgement for i2c_del_adapter() return value 5. release adapter when driver removed 6. add __devexit for puv3_i2c_remove() function 7. modify several names to more appropriated ones Signed-off-by: Guan Xuetao <gxt@mprc.pku.edu.cn> Acked-by: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
GuanXuetao
parent
e5abf78b57
commit
d10e4a660d
@ -4901,6 +4901,7 @@ W: http://mprc.pku.edu.cn/~guanxuetao/linux
|
||||
S: Maintained
|
||||
T: git git://git.kernel.org/pub/scm/linux/kernel/git/epip/linux-2.6-unicore32.git
|
||||
F: drivers/input/serio/i8042-unicore32io.h
|
||||
F: drivers/i2c/busses/i2c-puv3.c
|
||||
|
||||
PMC SIERRA MaxRAID DRIVER
|
||||
M: Anil Ravindranath <anil_ravindranath@pmc-sierra.com>
|
||||
|
||||
@ -114,6 +114,10 @@ CONFIG_INPUT_EVDEV=m
|
||||
# Keyboards
|
||||
CONFIG_KEYBOARD_GPIO=m
|
||||
|
||||
# I2C support
|
||||
CONFIG_I2C=y
|
||||
CONFIG_I2C_PUV3=y
|
||||
|
||||
# Hardware Monitoring support
|
||||
#CONFIG_SENSORS_LM75=m
|
||||
# Generic Thermal sysfs driver
|
||||
|
||||
@ -523,6 +523,17 @@ config I2C_PNX
|
||||
This driver can also be built as a module. If so, the module
|
||||
will be called i2c-pnx.
|
||||
|
||||
config I2C_PUV3
|
||||
tristate "PKUnity v3 I2C bus support"
|
||||
depends on UNICORE32 && ARCH_PUV3
|
||||
select I2C_ALGOBIT
|
||||
help
|
||||
This driver supports the I2C IP inside the PKUnity-v3 SoC.
|
||||
This I2C bus controller is under AMBA/AXI bus.
|
||||
|
||||
This driver can also be built as a module. If so, the module
|
||||
will be called i2c-puv3.
|
||||
|
||||
config I2C_PXA
|
||||
tristate "Intel PXA2XX I2C adapter"
|
||||
depends on ARCH_PXA || ARCH_MMP
|
||||
|
||||
@ -51,6 +51,7 @@ obj-$(CONFIG_I2C_PASEMI) += i2c-pasemi.o
|
||||
obj-$(CONFIG_I2C_PCA_PLATFORM) += i2c-pca-platform.o
|
||||
obj-$(CONFIG_I2C_PMCMSP) += i2c-pmcmsp.o
|
||||
obj-$(CONFIG_I2C_PNX) += i2c-pnx.o
|
||||
obj-$(CONFIG_I2C_PUV3) += i2c-puv3.o
|
||||
obj-$(CONFIG_I2C_PXA) += i2c-pxa.o
|
||||
obj-$(CONFIG_I2C_S3C2410) += i2c-s3c2410.o
|
||||
obj-$(CONFIG_I2C_S6000) += i2c-s6000.o
|
||||
|
||||
306
drivers/i2c/busses/i2c-puv3.c
Normal file
306
drivers/i2c/busses/i2c-puv3.c
Normal file
@ -0,0 +1,306 @@
|
||||
/*
|
||||
* 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 platform_device *dev, pm_message_t state)
|
||||
{
|
||||
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 int puv3_i2c_resume(struct platform_device *dev)
|
||||
{
|
||||
return 0 ;
|
||||
}
|
||||
#else
|
||||
#define puv3_i2c_suspend NULL
|
||||
#define puv3_i2c_resume NULL
|
||||
#endif
|
||||
|
||||
MODULE_ALIAS("platform:puv3_i2c");
|
||||
|
||||
static struct platform_driver puv3_i2c_driver = {
|
||||
.probe = puv3_i2c_probe,
|
||||
.remove = __devexit_p(puv3_i2c_remove),
|
||||
.suspend = puv3_i2c_suspend,
|
||||
.resume = puv3_i2c_resume,
|
||||
.driver = {
|
||||
.name = "PKUnity-v3-I2C",
|
||||
.owner = THIS_MODULE,
|
||||
}
|
||||
};
|
||||
|
||||
static int __init puv3_i2c_init(void)
|
||||
{
|
||||
return platform_driver_register(&puv3_i2c_driver);
|
||||
}
|
||||
|
||||
static void __exit puv3_i2c_exit(void)
|
||||
{
|
||||
platform_driver_unregister(&puv3_i2c_driver);
|
||||
}
|
||||
|
||||
module_init(puv3_i2c_init);
|
||||
module_exit(puv3_i2c_exit);
|
||||
|
||||
MODULE_DESCRIPTION("PKUnity v3 I2C driver");
|
||||
MODULE_LICENSE("GPL v2");
|
||||
Loading…
Reference in New Issue
Block a user