/*
- * drivers/i2c/busses/i2c-mv64xxx.c
- *
- * Driver for the i2c controller on the Marvell line of host bridges for MIPS
- * and PPC (e.g, gt642[46]0, mv643[46]0, mv644[46]0).
+ * Driver for the i2c controller on the Marvell line of host bridges
+ * (e.g, gt642[46]0, mv643[46]0, mv644[46]0, and Orion SoC family).
*
* Author: Mark A. Greer <mgreer@mvista.com>
*
* or implied.
*/
#include <linux/kernel.h>
+#include <linux/slab.h>
#include <linux/module.h>
#include <linux/spinlock.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
-#include <linux/mv643xx.h>
+#include <linux/mv643xx_i2c.h>
+#include <linux/platform_device.h>
+
#include <asm/io.h>
/* Register defines */
MV64XXX_I2C_STATE_WAITING_FOR_ADDR_2_ACK,
MV64XXX_I2C_STATE_WAITING_FOR_SLAVE_ACK,
MV64XXX_I2C_STATE_WAITING_FOR_SLAVE_DATA,
- MV64XXX_I2C_STATE_ABORTING,
};
/* Driver actions */
int irq;
u32 state;
u32 action;
+ u32 aborting;
u32 cntl_bits;
void __iomem *reg_base;
u32 reg_base_p;
+ u32 reg_size;
u32 addr1;
u32 addr2;
u32 bytes_left;
*
*****************************************************************************
*/
+
+/* Reset hardware and initialize FSM */
+static void
+mv64xxx_i2c_hw_init(struct mv64xxx_i2c_data *drv_data)
+{
+ writel(0, drv_data->reg_base + MV64XXX_I2C_REG_SOFT_RESET);
+ writel((((drv_data->freq_m & 0xf) << 3) | (drv_data->freq_n & 0x7)),
+ drv_data->reg_base + MV64XXX_I2C_REG_BAUD);
+ writel(0, drv_data->reg_base + MV64XXX_I2C_REG_SLAVE_ADDR);
+ writel(0, drv_data->reg_base + MV64XXX_I2C_REG_EXT_SLAVE_ADDR);
+ writel(MV64XXX_I2C_REG_CONTROL_TWSIEN | MV64XXX_I2C_REG_CONTROL_STOP,
+ drv_data->reg_base + MV64XXX_I2C_REG_CONTROL);
+ drv_data->state = MV64XXX_I2C_STATE_IDLE;
+}
+
static void
mv64xxx_i2c_fsm(struct mv64xxx_i2c_data *drv_data, u32 status)
{
return;
}
- if (drv_data->state == MV64XXX_I2C_STATE_ABORTING) {
- drv_data->action = MV64XXX_I2C_ACTION_SEND_STOP;
- drv_data->state = MV64XXX_I2C_STATE_IDLE;
- return;
- }
-
/* The status from the ctlr [mostly] tells us what to do next */
switch (status) {
/* Start condition interrupt */
/* FALLTHRU */
case MV64XXX_I2C_STATUS_MAST_WR_ADDR_2_ACK: /* 0xd0 */
case MV64XXX_I2C_STATUS_MAST_WR_ACK: /* 0x28 */
- if (drv_data->bytes_left > 0) {
+ if ((drv_data->bytes_left == 0)
+ || (drv_data->aborting
+ && (drv_data->byte_posn != 0))) {
+ drv_data->action = MV64XXX_I2C_ACTION_SEND_STOP;
+ drv_data->state = MV64XXX_I2C_STATE_IDLE;
+ } else {
drv_data->action = MV64XXX_I2C_ACTION_SEND_DATA;
drv_data->state =
MV64XXX_I2C_STATE_WAITING_FOR_SLAVE_ACK;
drv_data->bytes_left--;
- } else {
- drv_data->action = MV64XXX_I2C_ACTION_SEND_STOP;
- drv_data->state = MV64XXX_I2C_STATE_IDLE;
}
break;
}
drv_data->state = MV64XXX_I2C_STATE_WAITING_FOR_SLAVE_DATA;
- if (drv_data->bytes_left == 1)
+ if ((drv_data->bytes_left == 1) || drv_data->aborting)
drv_data->cntl_bits &= ~MV64XXX_I2C_REG_CONTROL_ACK;
break;
drv_data->state, status, drv_data->msg->addr,
drv_data->msg->flags);
drv_data->action = MV64XXX_I2C_ACTION_SEND_STOP;
- drv_data->state = MV64XXX_I2C_STATE_IDLE;
+ mv64xxx_i2c_hw_init(drv_data);
drv_data->rc = -EIO;
}
}
}
}
-static int
-mv64xxx_i2c_intr(int irq, void *dev_id, struct pt_regs *regs)
+static irqreturn_t
+mv64xxx_i2c_intr(int irq, void *dev_id)
{
struct mv64xxx_i2c_data *drv_data = dev_id;
unsigned long flags;
u32 status;
- int rc = IRQ_NONE;
+ irqreturn_t rc = IRQ_NONE;
spin_lock_irqsave(&drv_data->lock, flags);
while (readl(drv_data->reg_base + MV64XXX_I2C_REG_CONTROL) &
drv_data->msg = msg;
drv_data->byte_posn = 0;
drv_data->bytes_left = msg->len;
+ drv_data->aborting = 0;
drv_data->rc = 0;
drv_data->cntl_bits = MV64XXX_I2C_REG_CONTROL_ACK |
MV64XXX_I2C_REG_CONTROL_INTEN | MV64XXX_I2C_REG_CONTROL_TWSIEN;
if (msg->flags & I2C_M_RD)
dir = 1;
- if (msg->flags & I2C_M_REV_DIR_ADDR)
- dir ^= 1;
-
if (msg->flags & I2C_M_TEN) {
drv_data->addr1 = 0xf0 | (((u32)msg->addr & 0x300) >> 7) | dir;
drv_data->addr2 = (u32)msg->addr & 0xff;
char abort = 0;
time_left = wait_event_interruptible_timeout(drv_data->waitq,
- !drv_data->block, msecs_to_jiffies(drv_data->adapter.timeout));
+ !drv_data->block, drv_data->adapter.timeout);
spin_lock_irqsave(&drv_data->lock, flags);
if (!time_left) { /* Timed out */
}
if (abort && drv_data->block) {
- drv_data->state = MV64XXX_I2C_STATE_ABORTING;
+ drv_data->aborting = 1;
spin_unlock_irqrestore(&drv_data->lock, flags);
time_left = wait_event_timeout(drv_data->waitq,
- !drv_data->block,
- msecs_to_jiffies(drv_data->adapter.timeout));
+ !drv_data->block, drv_data->adapter.timeout);
- if (time_left <= 0) {
+ if ((time_left <= 0) && drv_data->block) {
drv_data->state = MV64XXX_I2C_STATE_IDLE;
dev_err(&drv_data->adapter.dev,
- "mv64xxx: I2C bus locked\n");
+ "mv64xxx: I2C bus locked, block: %d, "
+ "time_left: %d\n", drv_data->block,
+ (int)time_left);
+ mv64xxx_i2c_hw_init(drv_data);
}
} else
spin_unlock_irqrestore(&drv_data->lock, flags);
return num;
}
-static struct i2c_algorithm mv64xxx_i2c_algo = {
+static const struct i2c_algorithm mv64xxx_i2c_algo = {
.master_xfer = mv64xxx_i2c_xfer,
.functionality = mv64xxx_i2c_functionality,
};
*
*****************************************************************************
*/
-static void __devinit
-mv64xxx_i2c_hw_init(struct mv64xxx_i2c_data *drv_data)
-{
- writel(0, drv_data->reg_base + MV64XXX_I2C_REG_SOFT_RESET);
- writel((((drv_data->freq_m & 0xf) << 3) | (drv_data->freq_n & 0x7)),
- drv_data->reg_base + MV64XXX_I2C_REG_BAUD);
- writel(0, drv_data->reg_base + MV64XXX_I2C_REG_SLAVE_ADDR);
- writel(0, drv_data->reg_base + MV64XXX_I2C_REG_EXT_SLAVE_ADDR);
- writel(MV64XXX_I2C_REG_CONTROL_TWSIEN | MV64XXX_I2C_REG_CONTROL_STOP,
- drv_data->reg_base + MV64XXX_I2C_REG_CONTROL);
- drv_data->state = MV64XXX_I2C_STATE_IDLE;
-}
-
static int __devinit
mv64xxx_i2c_map_regs(struct platform_device *pd,
struct mv64xxx_i2c_data *drv_data)
{
- struct resource *r;
+ int size;
+ struct resource *r = platform_get_resource(pd, IORESOURCE_MEM, 0);
- if ((r = platform_get_resource(pd, IORESOURCE_MEM, 0)) &&
- request_mem_region(r->start, MV64XXX_I2C_REG_BLOCK_SIZE,
- drv_data->adapter.name)) {
+ if (!r)
+ return -ENODEV;
- drv_data->reg_base = ioremap(r->start,
- MV64XXX_I2C_REG_BLOCK_SIZE);
- drv_data->reg_base_p = r->start;
- } else
- return -ENOMEM;
+ size = resource_size(r);
+
+ if (!request_mem_region(r->start, size, drv_data->adapter.name))
+ return -EBUSY;
+
+ drv_data->reg_base = ioremap(r->start, size);
+ drv_data->reg_base_p = r->start;
+ drv_data->reg_size = size;
return 0;
}
-static void __devexit
+static void
mv64xxx_i2c_unmap_regs(struct mv64xxx_i2c_data *drv_data)
{
if (drv_data->reg_base) {
iounmap(drv_data->reg_base);
- release_mem_region(drv_data->reg_base_p,
- MV64XXX_I2C_REG_BLOCK_SIZE);
+ release_mem_region(drv_data->reg_base_p, drv_data->reg_size);
}
drv_data->reg_base = NULL;
}
static int __devinit
-mv64xxx_i2c_probe(struct device *dev)
+mv64xxx_i2c_probe(struct platform_device *pd)
{
- struct platform_device *pd = to_platform_device(dev);
struct mv64xxx_i2c_data *drv_data;
- struct mv64xxx_i2c_pdata *pdata = dev->platform_data;
+ struct mv64xxx_i2c_pdata *pdata = pd->dev.platform_data;
int rc;
if ((pd->id != 0) || !pdata)
return -ENODEV;
- drv_data = kmalloc(sizeof(struct mv64xxx_i2c_data), GFP_KERNEL);
-
+ drv_data = kzalloc(sizeof(struct mv64xxx_i2c_data), GFP_KERNEL);
if (!drv_data)
return -ENOMEM;
- memset(drv_data, 0, sizeof(struct mv64xxx_i2c_data));
-
if (mv64xxx_i2c_map_regs(pd, drv_data)) {
rc = -ENODEV;
goto exit_kfree;
}
- strncpy(drv_data->adapter.name, MV64XXX_I2C_CTLR_NAME " adapter",
- I2C_NAME_SIZE);
+ strlcpy(drv_data->adapter.name, MV64XXX_I2C_CTLR_NAME " adapter",
+ sizeof(drv_data->adapter.name));
init_waitqueue_head(&drv_data->waitq);
spin_lock_init(&drv_data->lock);
drv_data->freq_m = pdata->freq_m;
drv_data->freq_n = pdata->freq_n;
drv_data->irq = platform_get_irq(pd, 0);
- drv_data->adapter.id = I2C_HW_MV64XXX;
+ if (drv_data->irq < 0) {
+ rc = -ENXIO;
+ goto exit_unmap_regs;
+ }
+ drv_data->adapter.dev.parent = &pd->dev;
drv_data->adapter.algo = &mv64xxx_i2c_algo;
drv_data->adapter.owner = THIS_MODULE;
- drv_data->adapter.class = I2C_CLASS_HWMON;
- drv_data->adapter.timeout = pdata->timeout;
- drv_data->adapter.retries = pdata->retries;
- dev_set_drvdata(dev, drv_data);
+ drv_data->adapter.class = I2C_CLASS_HWMON | I2C_CLASS_SPD;
+ drv_data->adapter.timeout = msecs_to_jiffies(pdata->timeout);
+ drv_data->adapter.nr = pd->id;
+ platform_set_drvdata(pd, drv_data);
i2c_set_adapdata(&drv_data->adapter, drv_data);
- if (request_irq(drv_data->irq, mv64xxx_i2c_intr, 0,
- MV64XXX_I2C_CTLR_NAME, drv_data)) {
+ mv64xxx_i2c_hw_init(drv_data);
- dev_err(dev, "mv64xxx: Can't register intr handler "
- "irq: %d\n", drv_data->irq);
+ if (request_irq(drv_data->irq, mv64xxx_i2c_intr, 0,
+ MV64XXX_I2C_CTLR_NAME, drv_data)) {
+ dev_err(&drv_data->adapter.dev,
+ "mv64xxx: Can't register intr handler irq: %d\n",
+ drv_data->irq);
rc = -EINVAL;
goto exit_unmap_regs;
- } else if ((rc = i2c_add_adapter(&drv_data->adapter)) != 0) {
- dev_err(dev, "mv64xxx: Can't add i2c adapter, rc: %d\n", -rc);
+ } else if ((rc = i2c_add_numbered_adapter(&drv_data->adapter)) != 0) {
+ dev_err(&drv_data->adapter.dev,
+ "mv64xxx: Can't add i2c adapter, rc: %d\n", -rc);
goto exit_free_irq;
}
- mv64xxx_i2c_hw_init(drv_data);
-
return 0;
exit_free_irq:
}
static int __devexit
-mv64xxx_i2c_remove(struct device *dev)
+mv64xxx_i2c_remove(struct platform_device *dev)
{
- struct mv64xxx_i2c_data *drv_data = dev_get_drvdata(dev);
+ struct mv64xxx_i2c_data *drv_data = platform_get_drvdata(dev);
int rc;
rc = i2c_del_adapter(&drv_data->adapter);
return rc;
}
-static struct device_driver mv64xxx_i2c_driver = {
- .owner = THIS_MODULE,
- .name = MV64XXX_I2C_CTLR_NAME,
- .bus = &platform_bus_type,
+static struct platform_driver mv64xxx_i2c_driver = {
.probe = mv64xxx_i2c_probe,
- .remove = mv64xxx_i2c_remove,
+ .remove = __devexit_p(mv64xxx_i2c_remove),
+ .driver = {
+ .owner = THIS_MODULE,
+ .name = MV64XXX_I2C_CTLR_NAME,
+ },
};
static int __init
mv64xxx_i2c_init(void)
{
- return driver_register(&mv64xxx_i2c_driver);
+ return platform_driver_register(&mv64xxx_i2c_driver);
}
static void __exit
mv64xxx_i2c_exit(void)
{
- driver_unregister(&mv64xxx_i2c_driver);
+ platform_driver_unregister(&mv64xxx_i2c_driver);
}
module_init(mv64xxx_i2c_init);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff