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path: root/drivers/i2c/busses/i2c-at91.c
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Diffstat (limited to 'drivers/i2c/busses/i2c-at91.c')
-rw-r--r--drivers/i2c/busses/i2c-at91.c101
1 files changed, 54 insertions, 47 deletions
diff --git a/drivers/i2c/busses/i2c-at91.c b/drivers/i2c/busses/i2c-at91.c
index 2bfc04d0a1b..e95f9ba9679 100644
--- a/drivers/i2c/busses/i2c-at91.c
+++ b/drivers/i2c/busses/i2c-at91.c
@@ -28,12 +28,11 @@
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
-#include <linux/of_i2c.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/platform_data/dma-atmel.h>
-#define TWI_CLK_HZ 100000 /* max 400 Kbits/s */
+#define DEFAULT_TWI_CLK_HZ 100000 /* max 400 Kbits/s */
#define AT91_I2C_TIMEOUT msecs_to_jiffies(100) /* transfer timeout */
#define AT91_I2C_DMA_THRESHOLD 8 /* enable DMA if transfer size is bigger than this threshold */
@@ -372,7 +371,7 @@ static int at91_do_twi_transfer(struct at91_twi_dev *dev)
dev_dbg(dev->dev, "transfer: %s %d bytes.\n",
(dev->msg->flags & I2C_M_RD) ? "read" : "write", dev->buf_len);
- INIT_COMPLETION(dev->cmd_complete);
+ reinit_completion(&dev->cmd_complete);
dev->transfer_status = 0;
if (!dev->buf_len) {
@@ -553,13 +552,6 @@ static struct at91_twi_pdata at91sam9g10_config = {
.has_dma_support = false,
};
-static struct at91_twi_pdata at91sam9x5_config = {
- .clk_max_div = 7,
- .clk_offset = 4,
- .has_unre_flag = false,
- .has_dma_support = true,
-};
-
static const struct platform_device_id at91_twi_devtypes[] = {
{
.name = "i2c-at91rm9200",
@@ -582,11 +574,24 @@ static const struct platform_device_id at91_twi_devtypes[] = {
};
#if defined(CONFIG_OF)
+static struct at91_twi_pdata at91sam9x5_config = {
+ .clk_max_div = 7,
+ .clk_offset = 4,
+ .has_unre_flag = false,
+ .has_dma_support = true,
+};
+
static const struct of_device_id atmel_twi_dt_ids[] = {
{
+ .compatible = "atmel,at91rm9200-i2c",
+ .data = &at91rm9200_config,
+ } , {
.compatible = "atmel,at91sam9260-i2c",
.data = &at91sam9260_config,
} , {
+ .compatible = "atmel,at91sam9261-i2c",
+ .data = &at91sam9261_config,
+ } , {
.compatible = "atmel,at91sam9g20-i2c",
.data = &at91sam9g20_config,
} , {
@@ -600,15 +605,18 @@ static const struct of_device_id atmel_twi_dt_ids[] = {
}
};
MODULE_DEVICE_TABLE(of, atmel_twi_dt_ids);
-#else
-#define atmel_twi_dt_ids NULL
#endif
-static bool filter(struct dma_chan *chan, void *slave)
+static bool filter(struct dma_chan *chan, void *pdata)
{
- struct at_dma_slave *sl = slave;
+ struct at91_twi_pdata *sl_pdata = pdata;
+ struct at_dma_slave *sl;
+
+ if (!sl_pdata)
+ return false;
- if (sl->dma_dev == chan->device->dev) {
+ sl = &sl_pdata->dma_slave;
+ if (sl && (sl->dma_dev == chan->device->dev)) {
chan->private = sl;
return true;
} else {
@@ -619,11 +627,10 @@ static bool filter(struct dma_chan *chan, void *slave)
static int at91_twi_configure_dma(struct at91_twi_dev *dev, u32 phy_addr)
{
int ret = 0;
- struct at_dma_slave *sdata;
+ struct at91_twi_pdata *pdata = dev->pdata;
struct dma_slave_config slave_config;
struct at91_twi_dma *dma = &dev->dma;
-
- sdata = &dev->pdata->dma_slave;
+ dma_cap_mask_t mask;
memset(&slave_config, 0, sizeof(slave_config));
slave_config.src_addr = (dma_addr_t)phy_addr + AT91_TWI_RHR;
@@ -634,25 +641,22 @@ static int at91_twi_configure_dma(struct at91_twi_dev *dev, u32 phy_addr)
slave_config.dst_maxburst = 1;
slave_config.device_fc = false;
- if (sdata && sdata->dma_dev) {
- dma_cap_mask_t mask;
+ dma_cap_zero(mask);
+ dma_cap_set(DMA_SLAVE, mask);
- dma_cap_zero(mask);
- dma_cap_set(DMA_SLAVE, mask);
- dma->chan_tx = dma_request_channel(mask, filter, sdata);
- if (!dma->chan_tx) {
- dev_err(dev->dev, "no DMA channel available for tx\n");
- ret = -EBUSY;
- goto error;
- }
- dma->chan_rx = dma_request_channel(mask, filter, sdata);
- if (!dma->chan_rx) {
- dev_err(dev->dev, "no DMA channel available for rx\n");
- ret = -EBUSY;
- goto error;
- }
- } else {
- ret = -EINVAL;
+ dma->chan_tx = dma_request_slave_channel_compat(mask, filter, pdata,
+ dev->dev, "tx");
+ if (!dma->chan_tx) {
+ dev_err(dev->dev, "can't get a DMA channel for tx\n");
+ ret = -EBUSY;
+ goto error;
+ }
+
+ dma->chan_rx = dma_request_slave_channel_compat(mask, filter, pdata,
+ dev->dev, "rx");
+ if (!dma->chan_rx) {
+ dev_err(dev->dev, "can't get a DMA channel for rx\n");
+ ret = -EBUSY;
goto error;
}
@@ -707,6 +711,7 @@ static int at91_twi_probe(struct platform_device *pdev)
struct resource *mem;
int rc;
u32 phy_addr;
+ u32 bus_clk_rate;
dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
if (!dev)
@@ -723,9 +728,9 @@ static int at91_twi_probe(struct platform_device *pdev)
if (!dev->pdata)
return -ENODEV;
- dev->base = devm_request_and_ioremap(&pdev->dev, mem);
- if (!dev->base)
- return -EBUSY;
+ dev->base = devm_ioremap_resource(&pdev->dev, mem);
+ if (IS_ERR(dev->base))
+ return PTR_ERR(dev->base);
dev->irq = platform_get_irq(pdev, 0);
if (dev->irq < 0)
@@ -752,13 +757,18 @@ static int at91_twi_probe(struct platform_device *pdev)
dev->use_dma = true;
}
- at91_calc_twi_clock(dev, TWI_CLK_HZ);
+ rc = of_property_read_u32(dev->dev->of_node, "clock-frequency",
+ &bus_clk_rate);
+ if (rc)
+ bus_clk_rate = DEFAULT_TWI_CLK_HZ;
+
+ at91_calc_twi_clock(dev, bus_clk_rate);
at91_init_twi_bus(dev);
snprintf(dev->adapter.name, sizeof(dev->adapter.name), "AT91");
i2c_set_adapdata(&dev->adapter, dev);
dev->adapter.owner = THIS_MODULE;
- dev->adapter.class = I2C_CLASS_HWMON;
+ dev->adapter.class = I2C_CLASS_HWMON | I2C_CLASS_DEPRECATED;
dev->adapter.algo = &at91_twi_algorithm;
dev->adapter.dev.parent = dev->dev;
dev->adapter.nr = pdev->id;
@@ -773,8 +783,6 @@ static int at91_twi_probe(struct platform_device *pdev)
return rc;
}
- of_i2c_register_devices(&dev->adapter);
-
dev_info(dev->dev, "AT91 i2c bus driver.\n");
return 0;
}
@@ -782,12 +790,11 @@ static int at91_twi_probe(struct platform_device *pdev)
static int at91_twi_remove(struct platform_device *pdev)
{
struct at91_twi_dev *dev = platform_get_drvdata(pdev);
- int rc;
- rc = i2c_del_adapter(&dev->adapter);
+ i2c_del_adapter(&dev->adapter);
clk_disable_unprepare(dev->clk);
- return rc;
+ return 0;
}
#ifdef CONFIG_PM
@@ -825,7 +832,7 @@ static struct platform_driver at91_twi_driver = {
.driver = {
.name = "at91_i2c",
.owner = THIS_MODULE,
- .of_match_table = atmel_twi_dt_ids,
+ .of_match_table = of_match_ptr(atmel_twi_dt_ids),
.pm = at91_twi_pm_ops,
},
};
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-09 21:48:49 +0000