mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 09:19:51 +00:00
Merge branch 'for-2636/i2c/nuc' into next-i2c
This commit is contained in:
commit
f6e1901c4c
4 changed files with 726 additions and 0 deletions
9
arch/arm/mach-w90x900/include/mach/i2c.h
Normal file
9
arch/arm/mach-w90x900/include/mach/i2c.h
Normal file
|
@ -0,0 +1,9 @@
|
|||
#ifndef __ASM_ARCH_NUC900_I2C_H
|
||||
#define __ASM_ARCH_NUC900_I2C_H
|
||||
|
||||
struct nuc900_platform_i2c {
|
||||
int bus_num;
|
||||
unsigned long bus_freq;
|
||||
};
|
||||
|
||||
#endif /* __ASM_ARCH_NUC900_I2C_H */
|
|
@ -448,6 +448,13 @@ config I2C_NOMADIK
|
|||
If you say yes to this option, support will be included for the
|
||||
I2C interface from ST-Ericsson's Nomadik and Ux500 architectures.
|
||||
|
||||
config I2C_NUC900
|
||||
tristate "NUC900 I2C Driver"
|
||||
depends on ARCH_W90X900
|
||||
help
|
||||
Say Y here to include support for I2C controller in the
|
||||
Winbond/Nuvoton NUC900 based System-on-Chip devices.
|
||||
|
||||
config I2C_OCORES
|
||||
tristate "OpenCores I2C Controller"
|
||||
depends on EXPERIMENTAL
|
||||
|
|
|
@ -43,6 +43,7 @@ obj-$(CONFIG_I2C_IXP2000) += i2c-ixp2000.o
|
|||
obj-$(CONFIG_I2C_MPC) += i2c-mpc.o
|
||||
obj-$(CONFIG_I2C_MV64XXX) += i2c-mv64xxx.o
|
||||
obj-$(CONFIG_I2C_NOMADIK) += i2c-nomadik.o
|
||||
obj-$(CONFIG_I2C_NUC900) += i2c-nuc900.o
|
||||
obj-$(CONFIG_I2C_OCORES) += i2c-ocores.o
|
||||
obj-$(CONFIG_I2C_OMAP) += i2c-omap.o
|
||||
obj-$(CONFIG_I2C_PASEMI) += i2c-pasemi.o
|
||||
|
|
709
drivers/i2c/busses/i2c-nuc900.c
Normal file
709
drivers/i2c/busses/i2c-nuc900.c
Normal file
|
@ -0,0 +1,709 @@
|
|||
/*
|
||||
* linux/drivers/i2c/busses/i2c-nuc900.c
|
||||
*
|
||||
* Copyright (c) 2010 Nuvoton technology corporation.
|
||||
*
|
||||
* This driver based on S3C2410 I2C driver of Ben Dooks <ben-Y5A6D6n0/KfQXOPxS62xeg@public.gmane.org>.
|
||||
* Written by Wan ZongShun <mcuos.com-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
|
||||
*
|
||||
* 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;version 2 of the License.
|
||||
*
|
||||
*/
|
||||
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/module.h>
|
||||
|
||||
#include <linux/i2c.h>
|
||||
#include <linux/i2c-id.h>
|
||||
#include <linux/init.h>
|
||||
#include <linux/time.h>
|
||||
#include <linux/interrupt.h>
|
||||
#include <linux/delay.h>
|
||||
#include <linux/errno.h>
|
||||
#include <linux/err.h>
|
||||
#include <linux/platform_device.h>
|
||||
#include <linux/clk.h>
|
||||
#include <linux/cpufreq.h>
|
||||
#include <linux/slab.h>
|
||||
#include <linux/io.h>
|
||||
|
||||
#include <mach/mfp.h>
|
||||
#include <mach/i2c.h>
|
||||
|
||||
/* nuc900 i2c registers offset */
|
||||
|
||||
#define CSR 0x00
|
||||
#define DIVIDER 0x04
|
||||
#define CMDR 0x08
|
||||
#define SWR 0x0C
|
||||
#define RXR 0x10
|
||||
#define TXR 0x14
|
||||
|
||||
/* nuc900 i2c CSR register bits */
|
||||
|
||||
#define IRQEN 0x003
|
||||
#define I2CBUSY 0x400
|
||||
#define I2CSTART 0x018
|
||||
#define IRQFLAG 0x004
|
||||
#define ARBIT_LOST 0x200
|
||||
#define SLAVE_ACK 0x800
|
||||
|
||||
/* nuc900 i2c CMDR register bits */
|
||||
|
||||
#define I2C_CMD_START 0x10
|
||||
#define I2C_CMD_STOP 0x08
|
||||
#define I2C_CMD_READ 0x04
|
||||
#define I2C_CMD_WRITE 0x02
|
||||
#define I2C_CMD_NACK 0x01
|
||||
|
||||
/* i2c controller state */
|
||||
|
||||
enum nuc900_i2c_state {
|
||||
STATE_IDLE,
|
||||
STATE_START,
|
||||
STATE_READ,
|
||||
STATE_WRITE,
|
||||
STATE_STOP
|
||||
};
|
||||
|
||||
/* i2c controller private data */
|
||||
|
||||
struct nuc900_i2c {
|
||||
spinlock_t lock;
|
||||
wait_queue_head_t wait;
|
||||
|
||||
struct i2c_msg *msg;
|
||||
unsigned int msg_num;
|
||||
unsigned int msg_idx;
|
||||
unsigned int msg_ptr;
|
||||
unsigned int irq;
|
||||
|
||||
enum nuc900_i2c_state state;
|
||||
|
||||
void __iomem *regs;
|
||||
struct clk *clk;
|
||||
struct device *dev;
|
||||
struct resource *ioarea;
|
||||
struct i2c_adapter adap;
|
||||
};
|
||||
|
||||
/* nuc900_i2c_master_complete
|
||||
*
|
||||
* complete the message and wake up the caller, using the given return code,
|
||||
* or zero to mean ok.
|
||||
*/
|
||||
|
||||
static inline void nuc900_i2c_master_complete(struct nuc900_i2c *i2c, int ret)
|
||||
{
|
||||
dev_dbg(i2c->dev, "master_complete %d\n", ret);
|
||||
|
||||
i2c->msg_ptr = 0;
|
||||
i2c->msg = NULL;
|
||||
i2c->msg_idx++;
|
||||
i2c->msg_num = 0;
|
||||
if (ret)
|
||||
i2c->msg_idx = ret;
|
||||
|
||||
wake_up(&i2c->wait);
|
||||
}
|
||||
|
||||
/* irq enable/disable functions */
|
||||
|
||||
static inline void nuc900_i2c_disable_irq(struct nuc900_i2c *i2c)
|
||||
{
|
||||
unsigned long tmp;
|
||||
|
||||
tmp = readl(i2c->regs + CSR);
|
||||
writel(tmp & ~IRQEN, i2c->regs + CSR);
|
||||
}
|
||||
|
||||
static inline void nuc900_i2c_enable_irq(struct nuc900_i2c *i2c)
|
||||
{
|
||||
unsigned long tmp;
|
||||
|
||||
tmp = readl(i2c->regs + CSR);
|
||||
writel(tmp | IRQEN, i2c->regs + CSR);
|
||||
}
|
||||
|
||||
|
||||
/* nuc900_i2c_message_start
|
||||
*
|
||||
* put the start of a message onto the bus
|
||||
*/
|
||||
|
||||
static void nuc900_i2c_message_start(struct nuc900_i2c *i2c,
|
||||
struct i2c_msg *msg)
|
||||
{
|
||||
unsigned int addr = (msg->addr & 0x7f) << 1;
|
||||
|
||||
if (msg->flags & I2C_M_RD)
|
||||
addr |= 0x1;
|
||||
writel(addr & 0xff, i2c->regs + TXR);
|
||||
writel(I2C_CMD_START | I2C_CMD_WRITE, i2c->regs + CMDR);
|
||||
}
|
||||
|
||||
static inline void nuc900_i2c_stop(struct nuc900_i2c *i2c, int ret)
|
||||
{
|
||||
|
||||
dev_dbg(i2c->dev, "STOP\n");
|
||||
|
||||
/* stop the transfer */
|
||||
i2c->state = STATE_STOP;
|
||||
writel(I2C_CMD_STOP, i2c->regs + CMDR);
|
||||
|
||||
nuc900_i2c_master_complete(i2c, ret);
|
||||
nuc900_i2c_disable_irq(i2c);
|
||||
}
|
||||
|
||||
/* helper functions to determine the current state in the set of
|
||||
* messages we are sending
|
||||
*/
|
||||
|
||||
/* is_lastmsg()
|
||||
*
|
||||
* returns TRUE if the current message is the last in the set
|
||||
*/
|
||||
|
||||
static inline int is_lastmsg(struct nuc900_i2c *i2c)
|
||||
{
|
||||
return i2c->msg_idx >= (i2c->msg_num - 1);
|
||||
}
|
||||
|
||||
/* is_msglast
|
||||
*
|
||||
* returns TRUE if we this is the last byte in the current message
|
||||
*/
|
||||
|
||||
static inline int is_msglast(struct nuc900_i2c *i2c)
|
||||
{
|
||||
return i2c->msg_ptr == i2c->msg->len-1;
|
||||
}
|
||||
|
||||
/* is_msgend
|
||||
*
|
||||
* returns TRUE if we reached the end of the current message
|
||||
*/
|
||||
|
||||
static inline int is_msgend(struct nuc900_i2c *i2c)
|
||||
{
|
||||
return i2c->msg_ptr >= i2c->msg->len;
|
||||
}
|
||||
|
||||
/* i2c_nuc900_irq_nextbyte
|
||||
*
|
||||
* process an interrupt and work out what to do
|
||||
*/
|
||||
|
||||
static void i2c_nuc900_irq_nextbyte(struct nuc900_i2c *i2c,
|
||||
unsigned long iicstat)
|
||||
{
|
||||
unsigned char byte;
|
||||
|
||||
switch (i2c->state) {
|
||||
|
||||
case STATE_IDLE:
|
||||
dev_err(i2c->dev, "%s: called in STATE_IDLE\n", __func__);
|
||||
break;
|
||||
|
||||
case STATE_STOP:
|
||||
dev_err(i2c->dev, "%s: called in STATE_STOP\n", __func__);
|
||||
nuc900_i2c_disable_irq(i2c);
|
||||
break;
|
||||
|
||||
case STATE_START:
|
||||
/* last thing we did was send a start condition on the
|
||||
* bus, or started a new i2c message
|
||||
*/
|
||||
|
||||
if (iicstat & SLAVE_ACK &&
|
||||
!(i2c->msg->flags & I2C_M_IGNORE_NAK)) {
|
||||
/* ack was not received... */
|
||||
|
||||
dev_dbg(i2c->dev, "ack was not received\n");
|
||||
nuc900_i2c_stop(i2c, -ENXIO);
|
||||
break;
|
||||
}
|
||||
|
||||
if (i2c->msg->flags & I2C_M_RD)
|
||||
i2c->state = STATE_READ;
|
||||
else
|
||||
i2c->state = STATE_WRITE;
|
||||
|
||||
/* terminate the transfer if there is nothing to do
|
||||
* as this is used by the i2c probe to find devices.
|
||||
*/
|
||||
|
||||
if (is_lastmsg(i2c) && i2c->msg->len == 0) {
|
||||
nuc900_i2c_stop(i2c, 0);
|
||||
break;
|
||||
}
|
||||
|
||||
if (i2c->state == STATE_READ)
|
||||
goto prepare_read;
|
||||
|
||||
/* fall through to the write state, as we will need to
|
||||
* send a byte as well
|
||||
*/
|
||||
|
||||
case STATE_WRITE:
|
||||
/* we are writing data to the device... check for the
|
||||
* end of the message, and if so, work out what to do
|
||||
*/
|
||||
|
||||
if (!(i2c->msg->flags & I2C_M_IGNORE_NAK)) {
|
||||
if (iicstat & SLAVE_ACK) {
|
||||
dev_dbg(i2c->dev, "WRITE: No Ack\n");
|
||||
|
||||
nuc900_i2c_stop(i2c, -ECONNREFUSED);
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
retry_write:
|
||||
|
||||
if (!is_msgend(i2c)) {
|
||||
byte = i2c->msg->buf[i2c->msg_ptr++];
|
||||
writeb(byte, i2c->regs + TXR);
|
||||
writel(I2C_CMD_WRITE, i2c->regs + CMDR);
|
||||
|
||||
} else if (!is_lastmsg(i2c)) {
|
||||
/* we need to go to the next i2c message */
|
||||
|
||||
dev_dbg(i2c->dev, "WRITE: Next Message\n");
|
||||
|
||||
i2c->msg_ptr = 0;
|
||||
i2c->msg_idx++;
|
||||
i2c->msg++;
|
||||
|
||||
/* check to see if we need to do another message */
|
||||
if (i2c->msg->flags & I2C_M_NOSTART) {
|
||||
|
||||
if (i2c->msg->flags & I2C_M_RD) {
|
||||
/* cannot do this, the controller
|
||||
* forces us to send a new START
|
||||
* when we change direction
|
||||
*/
|
||||
|
||||
nuc900_i2c_stop(i2c, -EINVAL);
|
||||
}
|
||||
|
||||
goto retry_write;
|
||||
} else {
|
||||
/* send the new start */
|
||||
nuc900_i2c_message_start(i2c, i2c->msg);
|
||||
i2c->state = STATE_START;
|
||||
}
|
||||
|
||||
} else {
|
||||
/* send stop */
|
||||
|
||||
nuc900_i2c_stop(i2c, 0);
|
||||
}
|
||||
break;
|
||||
|
||||
case STATE_READ:
|
||||
/* we have a byte of data in the data register, do
|
||||
* something with it, and then work out wether we are
|
||||
* going to do any more read/write
|
||||
*/
|
||||
|
||||
byte = readb(i2c->regs + RXR);
|
||||
i2c->msg->buf[i2c->msg_ptr++] = byte;
|
||||
|
||||
prepare_read:
|
||||
if (is_msglast(i2c)) {
|
||||
/* last byte of buffer */
|
||||
|
||||
if (is_lastmsg(i2c))
|
||||
writel(I2C_CMD_READ | I2C_CMD_NACK,
|
||||
i2c->regs + CMDR);
|
||||
|
||||
} else if (is_msgend(i2c)) {
|
||||
/* ok, we've read the entire buffer, see if there
|
||||
* is anything else we need to do
|
||||
*/
|
||||
|
||||
if (is_lastmsg(i2c)) {
|
||||
/* last message, send stop and complete */
|
||||
dev_dbg(i2c->dev, "READ: Send Stop\n");
|
||||
|
||||
nuc900_i2c_stop(i2c, 0);
|
||||
} else {
|
||||
/* go to the next transfer */
|
||||
dev_dbg(i2c->dev, "READ: Next Transfer\n");
|
||||
|
||||
i2c->msg_ptr = 0;
|
||||
i2c->msg_idx++;
|
||||
i2c->msg++;
|
||||
|
||||
writel(I2C_CMD_READ, i2c->regs + CMDR);
|
||||
}
|
||||
|
||||
} else {
|
||||
writel(I2C_CMD_READ, i2c->regs + CMDR);
|
||||
}
|
||||
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
/* nuc900_i2c_irq
|
||||
*
|
||||
* top level IRQ servicing routine
|
||||
*/
|
||||
|
||||
static irqreturn_t nuc900_i2c_irq(int irqno, void *dev_id)
|
||||
{
|
||||
struct nuc900_i2c *i2c = dev_id;
|
||||
unsigned long status;
|
||||
|
||||
status = readl(i2c->regs + CSR);
|
||||
writel(status | IRQFLAG, i2c->regs + CSR);
|
||||
|
||||
if (status & ARBIT_LOST) {
|
||||
/* deal with arbitration loss */
|
||||
dev_err(i2c->dev, "deal with arbitration loss\n");
|
||||
goto out;
|
||||
}
|
||||
|
||||
if (i2c->state == STATE_IDLE) {
|
||||
dev_dbg(i2c->dev, "IRQ: error i2c->state == IDLE\n");
|
||||
goto out;
|
||||
}
|
||||
|
||||
/* pretty much this leaves us with the fact that we've
|
||||
* transmitted or received whatever byte we last sent
|
||||
*/
|
||||
|
||||
i2c_nuc900_irq_nextbyte(i2c, status);
|
||||
|
||||
out:
|
||||
return IRQ_HANDLED;
|
||||
}
|
||||
|
||||
|
||||
/* nuc900_i2c_set_master
|
||||
*
|
||||
* get the i2c bus for a master transaction
|
||||
*/
|
||||
|
||||
static int nuc900_i2c_set_master(struct nuc900_i2c *i2c)
|
||||
{
|
||||
int timeout = 400;
|
||||
|
||||
while (timeout-- > 0) {
|
||||
if (((readl(i2c->regs + SWR) & I2CSTART) == I2CSTART) &&
|
||||
((readl(i2c->regs + CSR) & I2CBUSY) == 0)) {
|
||||
return 0;
|
||||
}
|
||||
|
||||
msleep(1);
|
||||
}
|
||||
|
||||
return -ETIMEDOUT;
|
||||
}
|
||||
|
||||
/* nuc900_i2c_doxfer
|
||||
*
|
||||
* this starts an i2c transfer
|
||||
*/
|
||||
|
||||
static int nuc900_i2c_doxfer(struct nuc900_i2c *i2c,
|
||||
struct i2c_msg *msgs, int num)
|
||||
{
|
||||
unsigned long iicstat, timeout;
|
||||
int spins = 20;
|
||||
int ret;
|
||||
|
||||
ret = nuc900_i2c_set_master(i2c);
|
||||
if (ret != 0) {
|
||||
dev_err(i2c->dev, "cannot get bus (error %d)\n", ret);
|
||||
ret = -EAGAIN;
|
||||
goto out;
|
||||
}
|
||||
|
||||
spin_lock_irq(&i2c->lock);
|
||||
|
||||
i2c->msg = msgs;
|
||||
i2c->msg_num = num;
|
||||
i2c->msg_ptr = 0;
|
||||
i2c->msg_idx = 0;
|
||||
i2c->state = STATE_START;
|
||||
|
||||
nuc900_i2c_message_start(i2c, msgs);
|
||||
spin_unlock_irq(&i2c->lock);
|
||||
|
||||
timeout = wait_event_timeout(i2c->wait, i2c->msg_num == 0, HZ * 5);
|
||||
|
||||
ret = i2c->msg_idx;
|
||||
|
||||
/* having these next two as dev_err() makes life very
|
||||
* noisy when doing an i2cdetect
|
||||
*/
|
||||
|
||||
if (timeout == 0)
|
||||
dev_dbg(i2c->dev, "timeout\n");
|
||||
else if (ret != num)
|
||||
dev_dbg(i2c->dev, "incomplete xfer (%d)\n", ret);
|
||||
|
||||
/* ensure the stop has been through the bus */
|
||||
|
||||
dev_dbg(i2c->dev, "waiting for bus idle\n");
|
||||
|
||||
/* first, try busy waiting briefly */
|
||||
do {
|
||||
iicstat = readl(i2c->regs + CSR);
|
||||
} while ((iicstat & I2CBUSY) && --spins);
|
||||
|
||||
/* if that timed out sleep */
|
||||
if (!spins) {
|
||||
msleep(1);
|
||||
iicstat = readl(i2c->regs + CSR);
|
||||
}
|
||||
|
||||
if (iicstat & I2CBUSY)
|
||||
dev_warn(i2c->dev, "timeout waiting for bus idle\n");
|
||||
|
||||
out:
|
||||
return ret;
|
||||
}
|
||||
|
||||
/* nuc900_i2c_xfer
|
||||
*
|
||||
* first port of call from the i2c bus code when an message needs
|
||||
* transferring across the i2c bus.
|
||||
*/
|
||||
|
||||
static int nuc900_i2c_xfer(struct i2c_adapter *adap,
|
||||
struct i2c_msg *msgs, int num)
|
||||
{
|
||||
struct nuc900_i2c *i2c = (struct nuc900_i2c *)adap->algo_data;
|
||||
int retry;
|
||||
int ret;
|
||||
|
||||
nuc900_i2c_enable_irq(i2c);
|
||||
|
||||
for (retry = 0; retry < adap->retries; retry++) {
|
||||
|
||||
ret = nuc900_i2c_doxfer(i2c, msgs, num);
|
||||
|
||||
if (ret != -EAGAIN)
|
||||
return ret;
|
||||
|
||||
dev_dbg(i2c->dev, "Retrying transmission (%d)\n", retry);
|
||||
|
||||
udelay(100);
|
||||
}
|
||||
|
||||
return -EREMOTEIO;
|
||||
}
|
||||
|
||||
/* declare our i2c functionality */
|
||||
static u32 nuc900_i2c_func(struct i2c_adapter *adap)
|
||||
{
|
||||
return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL | I2C_FUNC_PROTOCOL_MANGLING;
|
||||
}
|
||||
|
||||
/* i2c bus registration info */
|
||||
|
||||
static const struct i2c_algorithm nuc900_i2c_algorithm = {
|
||||
.master_xfer = nuc900_i2c_xfer,
|
||||
.functionality = nuc900_i2c_func,
|
||||
};
|
||||
|
||||
/* nuc900_i2c_probe
|
||||
*
|
||||
* called by the bus driver when a suitable device is found
|
||||
*/
|
||||
|
||||
static int __devinit nuc900_i2c_probe(struct platform_device *pdev)
|
||||
{
|
||||
struct nuc900_i2c *i2c;
|
||||
struct nuc900_platform_i2c *pdata;
|
||||
struct resource *res;
|
||||
int ret;
|
||||
|
||||
pdata = pdev->dev.platform_data;
|
||||
if (!pdata) {
|
||||
dev_err(&pdev->dev, "no platform data\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
i2c = kzalloc(sizeof(struct nuc900_i2c), GFP_KERNEL);
|
||||
if (!i2c) {
|
||||
dev_err(&pdev->dev, "no memory for state\n");
|
||||
return -ENOMEM;
|
||||
}
|
||||
|
||||
strlcpy(i2c->adap.name, "nuc900-i2c0", sizeof(i2c->adap.name));
|
||||
i2c->adap.owner = THIS_MODULE;
|
||||
i2c->adap.algo = &nuc900_i2c_algorithm;
|
||||
i2c->adap.retries = 2;
|
||||
i2c->adap.class = I2C_CLASS_HWMON | I2C_CLASS_SPD;
|
||||
|
||||
spin_lock_init(&i2c->lock);
|
||||
init_waitqueue_head(&i2c->wait);
|
||||
|
||||
/* find the clock and enable it */
|
||||
|
||||
i2c->dev = &pdev->dev;
|
||||
i2c->clk = clk_get(&pdev->dev, NULL);
|
||||
if (IS_ERR(i2c->clk)) {
|
||||
dev_err(&pdev->dev, "cannot get clock\n");
|
||||
ret = -ENOENT;
|
||||
goto err_noclk;
|
||||
}
|
||||
|
||||
dev_dbg(&pdev->dev, "clock source %p\n", i2c->clk);
|
||||
|
||||
clk_enable(i2c->clk);
|
||||
|
||||
/* map the registers */
|
||||
|
||||
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
||||
if (res == NULL) {
|
||||
dev_err(&pdev->dev, "cannot find IO resource\n");
|
||||
ret = -ENOENT;
|
||||
goto err_clk;
|
||||
}
|
||||
|
||||
i2c->ioarea = request_mem_region(res->start, resource_size(res),
|
||||
pdev->name);
|
||||
|
||||
if (i2c->ioarea == NULL) {
|
||||
dev_err(&pdev->dev, "cannot request IO\n");
|
||||
ret = -ENXIO;
|
||||
goto err_clk;
|
||||
}
|
||||
|
||||
i2c->regs = ioremap(res->start, resource_size(res));
|
||||
|
||||
if (i2c->regs == NULL) {
|
||||
dev_err(&pdev->dev, "cannot map IO\n");
|
||||
ret = -ENXIO;
|
||||
goto err_ioarea;
|
||||
}
|
||||
|
||||
dev_dbg(&pdev->dev, "registers %p (%p, %p)\n",
|
||||
i2c->regs, i2c->ioarea, res);
|
||||
|
||||
/* setup info block for the i2c core */
|
||||
|
||||
i2c->adap.algo_data = i2c;
|
||||
i2c->adap.dev.parent = &pdev->dev;
|
||||
|
||||
mfp_set_groupg(&pdev->dev);
|
||||
|
||||
clk_get_rate(i2c->clk);
|
||||
|
||||
ret = (i2c->clk.apbfreq)/(pdata->bus_freq * 5) - 1;
|
||||
writel(ret & 0xffff, i2c->regs + DIVIDER);
|
||||
|
||||
/* find the IRQ for this unit (note, this relies on the init call to
|
||||
* ensure no current IRQs pending
|
||||
*/
|
||||
|
||||
i2c->irq = ret = platform_get_irq(pdev, 0);
|
||||
if (ret <= 0) {
|
||||
dev_err(&pdev->dev, "cannot find IRQ\n");
|
||||
goto err_iomap;
|
||||
}
|
||||
|
||||
ret = request_irq(i2c->irq, nuc900_i2c_irq, IRQF_DISABLED | IRQF_SHARED,
|
||||
dev_name(&pdev->dev), i2c);
|
||||
|
||||
if (ret != 0) {
|
||||
dev_err(&pdev->dev, "cannot claim IRQ %d\n", i2c->irq);
|
||||
goto err_iomap;
|
||||
}
|
||||
|
||||
/* Note, previous versions of the driver used i2c_add_adapter()
|
||||
* to add the bus at any number. We now pass the bus number via
|
||||
* the platform data, so if unset it will now default to always
|
||||
* being bus 0.
|
||||
*/
|
||||
|
||||
i2c->adap.nr = pdata->bus_num;
|
||||
|
||||
ret = i2c_add_numbered_adapter(&i2c->adap);
|
||||
if (ret < 0) {
|
||||
dev_err(&pdev->dev, "failed to add bus to i2c core\n");
|
||||
goto err_irq;
|
||||
}
|
||||
|
||||
platform_set_drvdata(pdev, i2c);
|
||||
|
||||
dev_info(&pdev->dev, "%s: NUC900 I2C adapter\n",
|
||||
dev_name(&i2c->adap.dev));
|
||||
return 0;
|
||||
|
||||
err_irq:
|
||||
free_irq(i2c->irq, i2c);
|
||||
|
||||
err_iomap:
|
||||
iounmap(i2c->regs);
|
||||
|
||||
err_ioarea:
|
||||
release_resource(i2c->ioarea);
|
||||
kfree(i2c->ioarea);
|
||||
|
||||
err_clk:
|
||||
clk_disable(i2c->clk);
|
||||
clk_put(i2c->clk);
|
||||
|
||||
err_noclk:
|
||||
kfree(i2c);
|
||||
return ret;
|
||||
}
|
||||
|
||||
/* nuc900_i2c_remove
|
||||
*
|
||||
* called when device is removed from the bus
|
||||
*/
|
||||
|
||||
static int __devexit nuc900_i2c_remove(struct platform_device *pdev)
|
||||
{
|
||||
struct nuc900_i2c *i2c = platform_get_drvdata(pdev);
|
||||
|
||||
i2c_del_adapter(&i2c->adap);
|
||||
free_irq(i2c->irq, i2c);
|
||||
|
||||
clk_disable(i2c->clk);
|
||||
clk_put(i2c->clk);
|
||||
|
||||
iounmap(i2c->regs);
|
||||
|
||||
release_resource(i2c->ioarea);
|
||||
kfree(i2c->ioarea);
|
||||
kfree(i2c);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static struct platform_driver nuc900_i2c_driver = {
|
||||
.probe = nuc900_i2c_probe,
|
||||
.remove = __devexit_p(nuc900_i2c_remove),
|
||||
.driver = {
|
||||
.owner = THIS_MODULE,
|
||||
.name = "nuc900-i2c0",
|
||||
},
|
||||
};
|
||||
|
||||
static int __init i2c_adap_nuc900_init(void)
|
||||
{
|
||||
return platform_driver_register(&nuc900_i2c_driver);
|
||||
}
|
||||
|
||||
static void __exit i2c_adap_nuc900_exit(void)
|
||||
{
|
||||
platform_driver_unregister(&nuc900_i2c_driver);
|
||||
}
|
||||
subsys_initcall(i2c_adap_nuc900_init);
|
||||
module_exit(i2c_adap_nuc900_exit);
|
||||
|
||||
MODULE_DESCRIPTION("NUC900 I2C Bus driver");
|
||||
MODULE_AUTHOR("Wan ZongShun, <mcuos.com-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>");
|
||||
MODULE_LICENSE("GPL");
|
||||
MODULE_ALIAS("platform:nuc900-i2c0");
|
Loading…
Reference in a new issue