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path: root/drivers/i2c/busses/i2c-xiic.c
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Diffstat (limited to 'drivers/i2c/busses/i2c-xiic.c')
-rw-r--r--drivers/i2c/busses/i2c-xiic.c149
1 files changed, 54 insertions, 95 deletions
diff --git a/drivers/i2c/busses/i2c-xiic.c b/drivers/i2c/busses/i2c-xiic.c
index a9c419e075a..7731f179586 100644
--- a/drivers/i2c/busses/i2c-xiic.c
+++ b/drivers/i2c/busses/i2c-xiic.c
@@ -21,7 +21,7 @@
* to the automotive development board Russellville. The copyright holder
* as seen in the header is Intel corporation.
* Mocean Laboratories forked off the GNU/Linux platform work into a
- * separate company called Pelagicore AB, which commited the code to the
+ * separate company called Pelagicore AB, which committed the code to the
* kernel.
*/
@@ -30,8 +30,8 @@
*/
#include <linux/kernel.h>
#include <linux/module.h>
-#include <linux/init.h>
#include <linux/errno.h>
+#include <linux/err.h>
#include <linux/delay.h>
#include <linux/platform_device.h>
#include <linux/i2c.h>
@@ -40,6 +40,7 @@
#include <linux/i2c-xiic.h>
#include <linux/io.h>
#include <linux/slab.h>
+#include <linux/of.h>
#define DRIVER_NAME "xiic-i2c"
@@ -68,7 +69,7 @@ struct xiic_i2c {
struct i2c_adapter adap;
struct i2c_msg *tx_msg;
spinlock_t lock;
- unsigned int tx_pos;
+ unsigned int tx_pos;
unsigned int nmsgs;
enum xilinx_i2c_state state;
struct i2c_msg *rx_msg;
@@ -271,8 +272,8 @@ static void xiic_read_rx(struct xiic_i2c *i2c)
bytes_in_fifo = xiic_getreg8(i2c, XIIC_RFO_REG_OFFSET) + 1;
- dev_dbg(i2c->adap.dev.parent, "%s entry, bytes in fifo: %d, msg: %d"
- ", SR: 0x%x, CR: 0x%x\n",
+ dev_dbg(i2c->adap.dev.parent,
+ "%s entry, bytes in fifo: %d, msg: %d, SR: 0x%x, CR: 0x%x\n",
__func__, bytes_in_fifo, xiic_rx_space(i2c),
xiic_getreg8(i2c, XIIC_SR_REG_OFFSET),
xiic_getreg8(i2c, XIIC_CR_REG_OFFSET));
@@ -311,10 +312,8 @@ static void xiic_fill_tx_fifo(struct xiic_i2c *i2c)
/* last message in transfer -> STOP */
data |= XIIC_TX_DYN_STOP_MASK;
dev_dbg(i2c->adap.dev.parent, "%s TX STOP\n", __func__);
-
- xiic_setreg16(i2c, XIIC_DTR_REG_OFFSET, data);
- } else
- xiic_setreg8(i2c, XIIC_DTR_REG_OFFSET, data);
+ }
+ xiic_setreg16(i2c, XIIC_DTR_REG_OFFSET, data);
}
}
@@ -341,9 +340,10 @@ static void xiic_process(struct xiic_i2c *i2c)
ier = xiic_getreg32(i2c, XIIC_IIER_OFFSET);
pend = isr & ier;
- dev_dbg(i2c->adap.dev.parent, "%s entry, IER: 0x%x, ISR: 0x%x, "
- "pend: 0x%x, SR: 0x%x, msg: %p, nmsgs: %d\n",
- __func__, ier, isr, pend, xiic_getreg8(i2c, XIIC_SR_REG_OFFSET),
+ dev_dbg(i2c->adap.dev.parent, "%s: IER: 0x%x, ISR: 0x%x, pend: 0x%x\n",
+ __func__, ier, isr, pend);
+ dev_dbg(i2c->adap.dev.parent, "%s: SR: 0x%x, msg: %p, nmsgs: %d\n",
+ __func__, xiic_getreg8(i2c, XIIC_SR_REG_OFFSET),
i2c->tx_msg, i2c->nmsgs);
/* Do not processes a devices interrupts if the device has no
@@ -426,7 +426,7 @@ static void xiic_process(struct xiic_i2c *i2c)
xiic_wakeup(i2c, STATE_ERROR);
} else if (pend & (XIIC_INTR_TX_EMPTY_MASK | XIIC_INTR_TX_HALF_MASK)) {
- /* Transmit register/FIFO is empty or ½ empty */
+ /* Transmit register/FIFO is empty or ½ empty */
clr = pend &
(XIIC_INTR_TX_EMPTY_MASK | XIIC_INTR_TX_HALF_MASK);
@@ -543,9 +543,10 @@ static void xiic_start_send(struct xiic_i2c *i2c)
xiic_irq_clr(i2c, XIIC_INTR_TX_ERROR_MASK);
- dev_dbg(i2c->adap.dev.parent, "%s entry, msg: %p, len: %d, "
- "ISR: 0x%x, CR: 0x%x\n",
- __func__, msg, msg->len, xiic_getreg32(i2c, XIIC_IISR_OFFSET),
+ dev_dbg(i2c->adap.dev.parent, "%s entry, msg: %p, len: %d",
+ __func__, msg, msg->len);
+ dev_dbg(i2c->adap.dev.parent, "%s entry, ISR: 0x%x, CR: 0x%x\n",
+ __func__, xiic_getreg32(i2c, XIIC_IISR_OFFSET),
xiic_getreg8(i2c, XIIC_CR_REG_OFFSET));
if (!(msg->flags & I2C_M_NOSTART)) {
@@ -683,12 +684,12 @@ static const struct i2c_algorithm xiic_algorithm = {
static struct i2c_adapter xiic_adapter = {
.owner = THIS_MODULE,
.name = DRIVER_NAME,
- .class = I2C_CLASS_HWMON | I2C_CLASS_SPD,
+ .class = I2C_CLASS_HWMON | I2C_CLASS_SPD | I2C_CLASS_DEPRECATED,
.algo = &xiic_algorithm,
};
-static int __devinit xiic_i2c_probe(struct platform_device *pdev)
+static int xiic_i2c_probe(struct platform_device *pdev)
{
struct xiic_i2c *i2c;
struct xiic_i2c_platform_data *pdata;
@@ -696,131 +697,89 @@ static int __devinit xiic_i2c_probe(struct platform_device *pdev)
int ret, irq;
u8 i;
+ i2c = devm_kzalloc(&pdev->dev, sizeof(*i2c), GFP_KERNEL);
+ if (!i2c)
+ return -ENOMEM;
+
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- if (!res)
- goto resource_missing;
+ i2c->base = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(i2c->base))
+ return PTR_ERR(i2c->base);
irq = platform_get_irq(pdev, 0);
if (irq < 0)
- goto resource_missing;
-
- pdata = (struct xiic_i2c_platform_data *) pdev->dev.platform_data;
- if (!pdata)
- return -EINVAL;
-
- i2c = kzalloc(sizeof(*i2c), GFP_KERNEL);
- if (!i2c)
- return -ENOMEM;
+ return irq;
- if (!request_mem_region(res->start, resource_size(res), pdev->name)) {
- dev_err(&pdev->dev, "Memory region busy\n");
- ret = -EBUSY;
- goto request_mem_failed;
- }
-
- i2c->base = ioremap(res->start, resource_size(res));
- if (!i2c->base) {
- dev_err(&pdev->dev, "Unable to map registers\n");
- ret = -EIO;
- goto map_failed;
- }
+ pdata = dev_get_platdata(&pdev->dev);
/* hook up driver to tree */
platform_set_drvdata(pdev, i2c);
i2c->adap = xiic_adapter;
i2c_set_adapdata(&i2c->adap, i2c);
i2c->adap.dev.parent = &pdev->dev;
-
- xiic_reinit(i2c);
+ i2c->adap.dev.of_node = pdev->dev.of_node;
spin_lock_init(&i2c->lock);
init_waitqueue_head(&i2c->wait);
- ret = request_irq(irq, xiic_isr, 0, pdev->name, i2c);
- if (ret) {
+
+ ret = devm_request_irq(&pdev->dev, irq, xiic_isr, 0, pdev->name, i2c);
+ if (ret < 0) {
dev_err(&pdev->dev, "Cannot claim IRQ\n");
- goto request_irq_failed;
+ return ret;
}
+ xiic_reinit(i2c);
+
/* add i2c adapter to i2c tree */
ret = i2c_add_adapter(&i2c->adap);
if (ret) {
dev_err(&pdev->dev, "Failed to add adapter\n");
- goto add_adapter_failed;
+ xiic_deinit(i2c);
+ return ret;
}
- /* add in known devices to the bus */
- for (i = 0; i < pdata->num_devices; i++)
- i2c_new_device(&i2c->adap, pdata->devices + i);
+ if (pdata) {
+ /* add in known devices to the bus */
+ for (i = 0; i < pdata->num_devices; i++)
+ i2c_new_device(&i2c->adap, pdata->devices + i);
+ }
return 0;
-
-add_adapter_failed:
- free_irq(irq, i2c);
-request_irq_failed:
- xiic_deinit(i2c);
- iounmap(i2c->base);
-map_failed:
- release_mem_region(res->start, resource_size(res));
-request_mem_failed:
- kfree(i2c);
-
- return ret;
-resource_missing:
- dev_err(&pdev->dev, "IRQ or Memory resource is missing\n");
- return -ENOENT;
}
-static int __devexit xiic_i2c_remove(struct platform_device* pdev)
+static int xiic_i2c_remove(struct platform_device *pdev)
{
struct xiic_i2c *i2c = platform_get_drvdata(pdev);
- struct resource *res;
/* remove adapter & data */
i2c_del_adapter(&i2c->adap);
xiic_deinit(i2c);
- platform_set_drvdata(pdev, NULL);
-
- free_irq(platform_get_irq(pdev, 0), i2c);
-
- iounmap(i2c->base);
-
- res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- if (res)
- release_mem_region(res->start, resource_size(res));
-
- kfree(i2c);
-
return 0;
}
-
-/* work with hotplug and coldplug */
-MODULE_ALIAS("platform:"DRIVER_NAME);
+#if defined(CONFIG_OF)
+static const struct of_device_id xiic_of_match[] = {
+ { .compatible = "xlnx,xps-iic-2.00.a", },
+ {},
+};
+MODULE_DEVICE_TABLE(of, xiic_of_match);
+#endif
static struct platform_driver xiic_i2c_driver = {
.probe = xiic_i2c_probe,
- .remove = __devexit_p(xiic_i2c_remove),
+ .remove = xiic_i2c_remove,
.driver = {
.owner = THIS_MODULE,
.name = DRIVER_NAME,
+ .of_match_table = of_match_ptr(xiic_of_match),
},
};
-static int __init xiic_i2c_init(void)
-{
- return platform_driver_register(&xiic_i2c_driver);
-}
-
-static void __exit xiic_i2c_exit(void)
-{
- platform_driver_unregister(&xiic_i2c_driver);
-}
-
-module_init(xiic_i2c_init);
-module_exit(xiic_i2c_exit);
+module_platform_driver(xiic_i2c_driver);
MODULE_AUTHOR("info@mocean-labs.com");
MODULE_DESCRIPTION("Xilinx I2C bus driver");
MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:"DRIVER_NAME);
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-03 18:30:03 +0000