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-rw-r--r--drivers/i2c/busses/i2c-at91.c7
-rw-r--r--drivers/i2c/busses/i2c-imx.c40
-rw-r--r--drivers/i2c/busses/i2c-mxs.c2
-rw-r--r--drivers/i2c/busses/i2c-omap.c36
-rw-r--r--drivers/i2c/busses/i2c-s3c2410.c1
5 files changed, 61 insertions, 25 deletions
diff --git a/drivers/i2c/busses/i2c-at91.c b/drivers/i2c/busses/i2c-at91.c
index aa59a25..c02bf20 100644
--- a/drivers/i2c/busses/i2c-at91.c
+++ b/drivers/i2c/busses/i2c-at91.c
@@ -39,6 +39,7 @@
#define AT91_TWI_STOP 0x0002 /* Send a Stop Condition */
#define AT91_TWI_MSEN 0x0004 /* Master Transfer Enable */
#define AT91_TWI_SVDIS 0x0020 /* Slave Transfer Disable */
+#define AT91_TWI_QUICK 0x0040 /* SMBus quick command */
#define AT91_TWI_SWRST 0x0080 /* Software Reset */
#define AT91_TWI_MMR 0x0004 /* Master Mode Register */
@@ -212,7 +213,11 @@ static int at91_do_twi_transfer(struct at91_twi_dev *dev)
INIT_COMPLETION(dev->cmd_complete);
dev->transfer_status = 0;
- if (dev->msg->flags & I2C_M_RD) {
+
+ if (!dev->buf_len) {
+ at91_twi_write(dev, AT91_TWI_CR, AT91_TWI_QUICK);
+ at91_twi_write(dev, AT91_TWI_IER, AT91_TWI_TXCOMP);
+ } else if (dev->msg->flags & I2C_M_RD) {
unsigned start_flags = AT91_TWI_START;
if (at91_twi_read(dev, AT91_TWI_SR) & AT91_TWI_RXRDY) {
diff --git a/drivers/i2c/busses/i2c-imx.c b/drivers/i2c/busses/i2c-imx.c
index 2ef162d..b973474 100644
--- a/drivers/i2c/busses/i2c-imx.c
+++ b/drivers/i2c/busses/i2c-imx.c
@@ -52,8 +52,6 @@
#include <linux/of_device.h>
#include <linux/of_i2c.h>
#include <linux/pinctrl/consumer.h>
-
-#include <mach/hardware.h>
#include <linux/platform_data/i2c-imx.h>
/** Defines ********************************************************************
@@ -115,6 +113,11 @@ static u16 __initdata i2c_clk_div[50][2] = {
{ 3072, 0x1E }, { 3840, 0x1F }
};
+enum imx_i2c_type {
+ IMX1_I2C,
+ IMX21_I2C,
+};
+
struct imx_i2c_struct {
struct i2c_adapter adapter;
struct clk *clk;
@@ -124,13 +127,33 @@ struct imx_i2c_struct {
unsigned int disable_delay;
int stopped;
unsigned int ifdr; /* IMX_I2C_IFDR */
+ enum imx_i2c_type devtype;
+};
+
+static struct platform_device_id imx_i2c_devtype[] = {
+ {
+ .name = "imx1-i2c",
+ .driver_data = IMX1_I2C,
+ }, {
+ .name = "imx21-i2c",
+ .driver_data = IMX21_I2C,
+ }, {
+ /* sentinel */
+ }
};
+MODULE_DEVICE_TABLE(platform, imx_i2c_devtype);
static const struct of_device_id i2c_imx_dt_ids[] = {
- { .compatible = "fsl,imx1-i2c", },
+ { .compatible = "fsl,imx1-i2c", .data = &imx_i2c_devtype[IMX1_I2C], },
+ { .compatible = "fsl,imx21-i2c", .data = &imx_i2c_devtype[IMX21_I2C], },
{ /* sentinel */ }
};
+static inline int is_imx1_i2c(struct imx_i2c_struct *i2c_imx)
+{
+ return i2c_imx->devtype == IMX1_I2C;
+}
+
/** Functions for IMX I2C adapter driver ***************************************
*******************************************************************************/
@@ -223,7 +246,7 @@ static void i2c_imx_stop(struct imx_i2c_struct *i2c_imx)
temp &= ~(I2CR_MSTA | I2CR_MTX);
writeb(temp, i2c_imx->base + IMX_I2C_I2CR);
}
- if (cpu_is_mx1()) {
+ if (is_imx1_i2c(i2c_imx)) {
/*
* This delay caused by an i.MXL hardware bug.
* If no (or too short) delay, no "STOP" bit will be generated.
@@ -465,6 +488,8 @@ static struct i2c_algorithm i2c_imx_algo = {
static int __init i2c_imx_probe(struct platform_device *pdev)
{
+ const struct of_device_id *of_id = of_match_device(i2c_imx_dt_ids,
+ &pdev->dev);
struct imx_i2c_struct *i2c_imx;
struct resource *res;
struct imxi2c_platform_data *pdata = pdev->dev.platform_data;
@@ -497,6 +522,10 @@ static int __init i2c_imx_probe(struct platform_device *pdev)
return -ENOMEM;
}
+ if (of_id)
+ pdev->id_entry = of_id->data;
+ i2c_imx->devtype = pdev->id_entry->driver_data;
+
/* Setup i2c_imx driver structure */
strlcpy(i2c_imx->adapter.name, pdev->name, sizeof(i2c_imx->adapter.name));
i2c_imx->adapter.owner = THIS_MODULE;
@@ -593,7 +622,8 @@ static struct platform_driver i2c_imx_driver = {
.name = DRIVER_NAME,
.owner = THIS_MODULE,
.of_match_table = i2c_imx_dt_ids,
- }
+ },
+ .id_table = imx_i2c_devtype,
};
static int __init i2c_adap_imx_init(void)
diff --git a/drivers/i2c/busses/i2c-mxs.c b/drivers/i2c/busses/i2c-mxs.c
index 286ca19..0670da7 100644
--- a/drivers/i2c/busses/i2c-mxs.c
+++ b/drivers/i2c/busses/i2c-mxs.c
@@ -287,12 +287,14 @@ read_init_dma_fail:
select_init_dma_fail:
dma_unmap_sg(i2c->dev, &i2c->sg_io[0], 1, DMA_TO_DEVICE);
select_init_pio_fail:
+ dmaengine_terminate_all(i2c->dmach);
return -EINVAL;
/* Write failpath. */
write_init_dma_fail:
dma_unmap_sg(i2c->dev, i2c->sg_io, 2, DMA_TO_DEVICE);
write_init_pio_fail:
+ dmaengine_terminate_all(i2c->dmach);
return -EINVAL;
}
diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c
index db31eae..3525c9e 100644
--- a/drivers/i2c/busses/i2c-omap.c
+++ b/drivers/i2c/busses/i2c-omap.c
@@ -43,7 +43,6 @@
#include <linux/slab.h>
#include <linux/i2c-omap.h>
#include <linux/pm_runtime.h>
-#include <linux/pm_qos.h>
/* I2C controller revisions */
#define OMAP_I2C_OMAP1_REV_2 0x20
@@ -187,8 +186,9 @@ struct omap_i2c_dev {
int reg_shift; /* bit shift for I2C register addresses */
struct completion cmd_complete;
struct resource *ioarea;
- u32 latency; /* maximum MPU wkup latency */
- struct pm_qos_request pm_qos_request;
+ u32 latency; /* maximum mpu wkup latency */
+ void (*set_mpu_wkup_lat)(struct device *dev,
+ long latency);
u32 speed; /* Speed of bus in kHz */
u32 dtrev; /* extra revision from DT */
u32 flags;
@@ -494,7 +494,9 @@ static void omap_i2c_resize_fifo(struct omap_i2c_dev *dev, u8 size, bool is_rx)
dev->b_hw = 1; /* Enable hardware fixes */
/* calculate wakeup latency constraint for MPU */
- dev->latency = (1000000 * dev->threshold) / (1000 * dev->speed / 8);
+ if (dev->set_mpu_wkup_lat != NULL)
+ dev->latency = (1000000 * dev->threshold) /
+ (1000 * dev->speed / 8);
}
/*
@@ -522,6 +524,9 @@ static int omap_i2c_xfer_msg(struct i2c_adapter *adap,
dev->buf = msg->buf;
dev->buf_len = msg->len;
+ /* make sure writes to dev->buf_len are ordered */
+ barrier();
+
omap_i2c_write_reg(dev, OMAP_I2C_CNT_REG, dev->buf_len);
/* Clear the FIFO Buffers */
@@ -579,7 +584,6 @@ static int omap_i2c_xfer_msg(struct i2c_adapter *adap,
*/
timeout = wait_for_completion_timeout(&dev->cmd_complete,
OMAP_I2C_TIMEOUT);
- dev->buf_len = 0;
if (timeout == 0) {
dev_err(dev->dev, "controller timed out\n");
omap_i2c_init(dev);
@@ -629,16 +633,8 @@ omap_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num)
if (r < 0)
goto out;
- /*
- * When waiting for completion of a i2c transfer, we need to
- * set a wake up latency constraint for the MPU. This is to
- * ensure quick enough wakeup from idle, when transfer
- * completes.
- */
- if (dev->latency)
- pm_qos_add_request(&dev->pm_qos_request,
- PM_QOS_CPU_DMA_LATENCY,
- dev->latency);
+ if (dev->set_mpu_wkup_lat != NULL)
+ dev->set_mpu_wkup_lat(dev->dev, dev->latency);
for (i = 0; i < num; i++) {
r = omap_i2c_xfer_msg(adap, &msgs[i], (i == (num - 1)));
@@ -646,8 +642,8 @@ omap_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num)
break;
}
- if (dev->latency)
- pm_qos_remove_request(&dev->pm_qos_request);
+ if (dev->set_mpu_wkup_lat != NULL)
+ dev->set_mpu_wkup_lat(dev->dev, -1);
if (r == 0)
r = num;
@@ -1104,6 +1100,7 @@ omap_i2c_probe(struct platform_device *pdev)
} else if (pdata != NULL) {
dev->speed = pdata->clkrate;
dev->flags = pdata->flags;
+ dev->set_mpu_wkup_lat = pdata->set_mpu_wkup_lat;
dev->dtrev = pdata->rev;
}
@@ -1159,8 +1156,9 @@ omap_i2c_probe(struct platform_device *pdev)
dev->b_hw = 1; /* Enable hardware fixes */
/* calculate wakeup latency constraint for MPU */
- dev->latency = (1000000 * dev->fifo_size) /
- (1000 * dev->speed / 8);
+ if (dev->set_mpu_wkup_lat != NULL)
+ dev->latency = (1000000 * dev->fifo_size) /
+ (1000 * dev->speed / 8);
}
/* reset ASAP, clearing any IRQs */
diff --git a/drivers/i2c/busses/i2c-s3c2410.c b/drivers/i2c/busses/i2c-s3c2410.c
index 3e0335f..9d90272 100644
--- a/drivers/i2c/busses/i2c-s3c2410.c
+++ b/drivers/i2c/busses/i2c-s3c2410.c
@@ -806,6 +806,7 @@ static int s3c24xx_i2c_parse_dt_gpio(struct s3c24xx_i2c *i2c)
dev_err(i2c->dev, "invalid gpio[%d]: %d\n", idx, gpio);
goto free_gpio;
}
+ i2c->gpios[idx] = gpio;
ret = gpio_request(gpio, "i2c-bus");
if (ret) {
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