summaryrefslogtreecommitdiff
path: root/drivers/i2c/busses
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/i2c/busses')
-rw-r--r--drivers/i2c/busses/i2c-i801.c1
-rw-r--r--drivers/i2c/busses/i2c-mv64xxx.c45
-rw-r--r--drivers/i2c/busses/i2c-nforce2.c2
-rw-r--r--drivers/i2c/busses/i2c-omap.c73
4 files changed, 65 insertions, 56 deletions
diff --git a/drivers/i2c/busses/i2c-i801.c b/drivers/i2c/busses/i2c-i801.c
index 02835ce..7979aef7e 100644
--- a/drivers/i2c/busses/i2c-i801.c
+++ b/drivers/i2c/busses/i2c-i801.c
@@ -72,6 +72,7 @@
#include <linux/acpi.h>
#include <linux/io.h>
#include <linux/dmi.h>
+#include <linux/slab.h>
/* I801 SMBus address offsets */
#define SMBHSTSTS(p) (0 + (p)->smba)
diff --git a/drivers/i2c/busses/i2c-mv64xxx.c b/drivers/i2c/busses/i2c-mv64xxx.c
index 1624206..a9941c6 100644
--- a/drivers/i2c/busses/i2c-mv64xxx.c
+++ b/drivers/i2c/busses/i2c-mv64xxx.c
@@ -59,6 +59,7 @@ enum {
MV64XXX_I2C_STATE_INVALID,
MV64XXX_I2C_STATE_IDLE,
MV64XXX_I2C_STATE_WAITING_FOR_START_COND,
+ MV64XXX_I2C_STATE_WAITING_FOR_RESTART,
MV64XXX_I2C_STATE_WAITING_FOR_ADDR_1_ACK,
MV64XXX_I2C_STATE_WAITING_FOR_ADDR_2_ACK,
MV64XXX_I2C_STATE_WAITING_FOR_SLAVE_ACK,
@@ -70,6 +71,7 @@ enum {
MV64XXX_I2C_ACTION_INVALID,
MV64XXX_I2C_ACTION_CONTINUE,
MV64XXX_I2C_ACTION_SEND_START,
+ MV64XXX_I2C_ACTION_SEND_RESTART,
MV64XXX_I2C_ACTION_SEND_ADDR_1,
MV64XXX_I2C_ACTION_SEND_ADDR_2,
MV64XXX_I2C_ACTION_SEND_DATA,
@@ -91,6 +93,7 @@ struct mv64xxx_i2c_data {
u32 addr2;
u32 bytes_left;
u32 byte_posn;
+ u32 send_stop;
u32 block;
int rc;
u32 freq_m;
@@ -159,8 +162,15 @@ mv64xxx_i2c_fsm(struct mv64xxx_i2c_data *drv_data, u32 status)
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;
+ if (drv_data->send_stop) {
+ drv_data->action = MV64XXX_I2C_ACTION_SEND_STOP;
+ drv_data->state = MV64XXX_I2C_STATE_IDLE;
+ } else {
+ drv_data->action =
+ MV64XXX_I2C_ACTION_SEND_RESTART;
+ drv_data->state =
+ MV64XXX_I2C_STATE_WAITING_FOR_RESTART;
+ }
} else {
drv_data->action = MV64XXX_I2C_ACTION_SEND_DATA;
drv_data->state =
@@ -228,6 +238,15 @@ static void
mv64xxx_i2c_do_action(struct mv64xxx_i2c_data *drv_data)
{
switch(drv_data->action) {
+ case MV64XXX_I2C_ACTION_SEND_RESTART:
+ drv_data->cntl_bits |= MV64XXX_I2C_REG_CONTROL_START;
+ drv_data->cntl_bits &= ~MV64XXX_I2C_REG_CONTROL_INTEN;
+ writel(drv_data->cntl_bits,
+ drv_data->reg_base + MV64XXX_I2C_REG_CONTROL);
+ drv_data->block = 0;
+ wake_up_interruptible(&drv_data->waitq);
+ break;
+
case MV64XXX_I2C_ACTION_CONTINUE:
writel(drv_data->cntl_bits,
drv_data->reg_base + MV64XXX_I2C_REG_CONTROL);
@@ -386,7 +405,8 @@ mv64xxx_i2c_wait_for_completion(struct mv64xxx_i2c_data *drv_data)
}
static int
-mv64xxx_i2c_execute_msg(struct mv64xxx_i2c_data *drv_data, struct i2c_msg *msg)
+mv64xxx_i2c_execute_msg(struct mv64xxx_i2c_data *drv_data, struct i2c_msg *msg,
+ int is_first, int is_last)
{
unsigned long flags;
@@ -406,10 +426,18 @@ mv64xxx_i2c_execute_msg(struct mv64xxx_i2c_data *drv_data, struct i2c_msg *msg)
drv_data->bytes_left--;
}
} else {
- drv_data->action = MV64XXX_I2C_ACTION_SEND_START;
- drv_data->state = MV64XXX_I2C_STATE_WAITING_FOR_START_COND;
+ if (is_first) {
+ drv_data->action = MV64XXX_I2C_ACTION_SEND_START;
+ drv_data->state =
+ MV64XXX_I2C_STATE_WAITING_FOR_START_COND;
+ } else {
+ drv_data->action = MV64XXX_I2C_ACTION_SEND_ADDR_1;
+ drv_data->state =
+ MV64XXX_I2C_STATE_WAITING_FOR_ADDR_1_ACK;
+ }
}
+ drv_data->send_stop = is_last;
drv_data->block = 1;
mv64xxx_i2c_do_action(drv_data);
spin_unlock_irqrestore(&drv_data->lock, flags);
@@ -437,9 +465,12 @@ mv64xxx_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num)
struct mv64xxx_i2c_data *drv_data = i2c_get_adapdata(adap);
int i, rc;
- for (i=0; i<num; i++)
- if ((rc = mv64xxx_i2c_execute_msg(drv_data, &msgs[i])) < 0)
+ for (i = 0; i < num; i++) {
+ rc = mv64xxx_i2c_execute_msg(drv_data, &msgs[i],
+ i == 0, i + 1 == num);
+ if (rc < 0)
return rc;
+ }
return num;
}
diff --git a/drivers/i2c/busses/i2c-nforce2.c b/drivers/i2c/busses/i2c-nforce2.c
index a605a50..ff1e127 100644
--- a/drivers/i2c/busses/i2c-nforce2.c
+++ b/drivers/i2c/busses/i2c-nforce2.c
@@ -432,7 +432,7 @@ static int __devinit nforce2_probe(struct pci_dev *dev, const struct pci_device_
static void __devexit nforce2_remove(struct pci_dev *dev)
{
- struct nforce2_smbus *smbuses = (void*) pci_get_drvdata(dev);
+ struct nforce2_smbus *smbuses = pci_get_drvdata(dev);
nforce2_set_reference(NULL);
if (smbuses[0].base) {
diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c
index 3e9323e..b605ff3 100644
--- a/drivers/i2c/busses/i2c-omap.c
+++ b/drivers/i2c/busses/i2c-omap.c
@@ -39,6 +39,7 @@
#include <linux/io.h>
#include <linux/slab.h>
#include <linux/i2c-omap.h>
+#include <linux/pm_runtime.h>
/* I2C controller revisions */
#define OMAP_I2C_REV_2 0x20
@@ -175,8 +176,6 @@ struct omap_i2c_dev {
void __iomem *base; /* virtual */
int irq;
int reg_shift; /* bit shift for I2C register addresses */
- struct clk *iclk; /* Interface clock */
- struct clk *fclk; /* Functional clock */
struct completion cmd_complete;
struct resource *ioarea;
u32 latency; /* maximum mpu wkup latency */
@@ -265,45 +264,18 @@ static inline u16 omap_i2c_read_reg(struct omap_i2c_dev *i2c_dev, int reg)
(i2c_dev->regs[reg] << i2c_dev->reg_shift));
}
-static int __init omap_i2c_get_clocks(struct omap_i2c_dev *dev)
+static void omap_i2c_unidle(struct omap_i2c_dev *dev)
{
- int ret;
+ struct platform_device *pdev;
+ struct omap_i2c_bus_platform_data *pdata;
- dev->iclk = clk_get(dev->dev, "ick");
- if (IS_ERR(dev->iclk)) {
- ret = PTR_ERR(dev->iclk);
- dev->iclk = NULL;
- return ret;
- }
+ WARN_ON(!dev->idle);
- dev->fclk = clk_get(dev->dev, "fck");
- if (IS_ERR(dev->fclk)) {
- ret = PTR_ERR(dev->fclk);
- if (dev->iclk != NULL) {
- clk_put(dev->iclk);
- dev->iclk = NULL;
- }
- dev->fclk = NULL;
- return ret;
- }
+ pdev = to_platform_device(dev->dev);
+ pdata = pdev->dev.platform_data;
- return 0;
-}
+ pm_runtime_get_sync(&pdev->dev);
-static void omap_i2c_put_clocks(struct omap_i2c_dev *dev)
-{
- clk_put(dev->fclk);
- dev->fclk = NULL;
- clk_put(dev->iclk);
- dev->iclk = NULL;
-}
-
-static void omap_i2c_unidle(struct omap_i2c_dev *dev)
-{
- WARN_ON(!dev->idle);
-
- clk_enable(dev->iclk);
- clk_enable(dev->fclk);
if (cpu_is_omap34xx()) {
omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, 0);
omap_i2c_write_reg(dev, OMAP_I2C_PSC_REG, dev->pscstate);
@@ -326,10 +298,15 @@ static void omap_i2c_unidle(struct omap_i2c_dev *dev)
static void omap_i2c_idle(struct omap_i2c_dev *dev)
{
+ struct platform_device *pdev;
+ struct omap_i2c_bus_platform_data *pdata;
u16 iv;
WARN_ON(dev->idle);
+ pdev = to_platform_device(dev->dev);
+ pdata = pdev->dev.platform_data;
+
dev->iestate = omap_i2c_read_reg(dev, OMAP_I2C_IE_REG);
if (dev->rev >= OMAP_I2C_REV_ON_4430)
omap_i2c_write_reg(dev, OMAP_I2C_IRQENABLE_CLR, 1);
@@ -345,8 +322,8 @@ static void omap_i2c_idle(struct omap_i2c_dev *dev)
omap_i2c_read_reg(dev, OMAP_I2C_STAT_REG);
}
dev->idle = 1;
- clk_disable(dev->fclk);
- clk_disable(dev->iclk);
+
+ pm_runtime_put_sync(&pdev->dev);
}
static int omap_i2c_init(struct omap_i2c_dev *dev)
@@ -356,6 +333,7 @@ static int omap_i2c_init(struct omap_i2c_dev *dev)
unsigned long fclk_rate = 12000000;
unsigned long timeout;
unsigned long internal_clk = 0;
+ struct clk *fclk;
if (dev->rev >= OMAP_I2C_REV_2) {
/* Disable I2C controller before soft reset */
@@ -414,7 +392,9 @@ static int omap_i2c_init(struct omap_i2c_dev *dev)
* always returns 12MHz for the functional clock, we can
* do this bit unconditionally.
*/
- fclk_rate = clk_get_rate(dev->fclk);
+ fclk = clk_get(dev->dev, "fck");
+ fclk_rate = clk_get_rate(fclk);
+ clk_put(fclk);
/* TRM for 5912 says the I2C clock must be prescaled to be
* between 7 - 12 MHz. The XOR input clock is typically
@@ -443,7 +423,9 @@ static int omap_i2c_init(struct omap_i2c_dev *dev)
internal_clk = 9600;
else
internal_clk = 4000;
- fclk_rate = clk_get_rate(dev->fclk) / 1000;
+ fclk = clk_get(dev->dev, "fck");
+ fclk_rate = clk_get_rate(fclk) / 1000;
+ clk_put(fclk);
/* Compute prescaler divisor */
psc = fclk_rate / internal_clk;
@@ -1050,14 +1032,12 @@ omap_i2c_probe(struct platform_device *pdev)
else
dev->reg_shift = 2;
- if ((r = omap_i2c_get_clocks(dev)) != 0)
- goto err_iounmap;
-
if (cpu_is_omap44xx())
dev->regs = (u8 *) omap4_reg_map;
else
dev->regs = (u8 *) reg_map;
+ pm_runtime_enable(&pdev->dev);
omap_i2c_unidle(dev);
dev->rev = omap_i2c_read_reg(dev, OMAP_I2C_REV_REG) & 0xff;
@@ -1129,8 +1109,6 @@ err_free_irq:
err_unuse_clocks:
omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, 0);
omap_i2c_idle(dev);
- omap_i2c_put_clocks(dev);
-err_iounmap:
iounmap(dev->base);
err_free_mem:
platform_set_drvdata(pdev, NULL);
@@ -1152,7 +1130,6 @@ omap_i2c_remove(struct platform_device *pdev)
free_irq(dev->irq, dev);
i2c_del_adapter(&dev->adapter);
omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, 0);
- omap_i2c_put_clocks(dev);
iounmap(dev->base);
kfree(dev);
mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
@@ -1164,7 +1141,7 @@ static struct platform_driver omap_i2c_driver = {
.probe = omap_i2c_probe,
.remove = omap_i2c_remove,
.driver = {
- .name = "i2c_omap",
+ .name = "omap_i2c",
.owner = THIS_MODULE,
},
};
@@ -1186,4 +1163,4 @@ module_exit(omap_i2c_exit_driver);
MODULE_AUTHOR("MontaVista Software, Inc. (and others)");
MODULE_DESCRIPTION("TI OMAP I2C bus adapter");
MODULE_LICENSE("GPL");
-MODULE_ALIAS("platform:i2c_omap");
+MODULE_ALIAS("platform:omap_i2c");
generated by cgit v0.10.2 at 2024-09-11 15:37:13 (GMT)