Commit c5ba47ba authored by Ben Dooks's avatar Ben Dooks

Merge branch 'for-2638/i2c/ocores' into for-linus/i2c-2638

parents 084b7c83 d9240e61
......@@ -9,6 +9,41 @@
* kind, whether express or implied.
*/
/*
* Device tree configuration:
*
* Required properties:
* - compatible : "opencores,i2c-ocores"
* - reg : bus address start and address range size of device
* - interrupts : interrupt number
* - regstep : size of device registers in bytes
* - clock-frequency : frequency of bus clock in Hz
*
* Example:
*
* i2c0: ocores@a0000000 {
* compatible = "opencores,i2c-ocores";
* reg = <0xa0000000 0x8>;
* interrupts = <10>;
*
* regstep = <1>;
* clock-frequency = <20000000>;
*
* -- Devices connected on this I2C bus get
* -- defined here; address- and size-cells
* -- apply to these child devices
*
* #address-cells = <1>;
* #size-cells = <0>;
*
* dummy@60 {
* compatible = "dummy";
* reg = <60>;
* };
* };
*
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
......@@ -210,6 +245,32 @@ static struct i2c_adapter ocores_adapter = {
.algo = &ocores_algorithm,
};
#ifdef CONFIG_OF
static int ocores_i2c_of_probe(struct platform_device* pdev,
struct ocores_i2c* i2c)
{
__be32* val;
val = of_get_property(pdev->dev.of_node, "regstep", NULL);
if (!val) {
dev_err(&pdev->dev, "Missing required parameter 'regstep'");
return -ENODEV;
}
i2c->regstep = be32_to_cpup(val);
val = of_get_property(pdev->dev.of_node, "clock-frequency", NULL);
if (!val) {
dev_err(&pdev->dev,
"Missing required parameter 'clock-frequency'");
return -ENODEV;
}
i2c->clock_khz = be32_to_cpup(val) / 1000;
return 0;
}
#else
#define ocores_i2c_of_probe(pdev,i2c) -ENODEV
#endif
static int __devinit ocores_i2c_probe(struct platform_device *pdev)
{
......@@ -227,37 +288,41 @@ static int __devinit ocores_i2c_probe(struct platform_device *pdev)
if (!res2)
return -ENODEV;
pdata = (struct ocores_i2c_platform_data*) pdev->dev.platform_data;
if (!pdata)
return -ENODEV;
i2c = kzalloc(sizeof(*i2c), GFP_KERNEL);
i2c = devm_kzalloc(&pdev->dev, sizeof(*i2c), GFP_KERNEL);
if (!i2c)
return -ENOMEM;
if (!request_mem_region(res->start, resource_size(res),
pdev->name)) {
if (!devm_request_mem_region(&pdev->dev, res->start,
resource_size(res), pdev->name)) {
dev_err(&pdev->dev, "Memory region busy\n");
ret = -EBUSY;
goto request_mem_failed;
return -EBUSY;
}
i2c->base = ioremap(res->start, resource_size(res));
i2c->base = devm_ioremap_nocache(&pdev->dev, res->start,
resource_size(res));
if (!i2c->base) {
dev_err(&pdev->dev, "Unable to map registers\n");
ret = -EIO;
goto map_failed;
return -EIO;
}
pdata = pdev->dev.platform_data;
if (pdata) {
i2c->regstep = pdata->regstep;
i2c->clock_khz = pdata->clock_khz;
} else {
ret = ocores_i2c_of_probe(pdev, i2c);
if (ret)
return ret;
}
ocores_init(i2c);
init_waitqueue_head(&i2c->wait);
ret = request_irq(res2->start, ocores_isr, 0, pdev->name, i2c);
ret = devm_request_irq(&pdev->dev, res2->start, ocores_isr, 0,
pdev->name, i2c);
if (ret) {
dev_err(&pdev->dev, "Cannot claim IRQ\n");
goto request_irq_failed;
return ret;
}
/* hook up driver to tree */
......@@ -265,36 +330,29 @@ static int __devinit ocores_i2c_probe(struct platform_device *pdev)
i2c->adap = ocores_adapter;
i2c_set_adapdata(&i2c->adap, i2c);
i2c->adap.dev.parent = &pdev->dev;
#ifdef CONFIG_OF
i2c->adap.dev.of_node = pdev->dev.of_node;
#endif
/* 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;
return ret;
}
/* add in known devices to the bus */
if (pdata) {
for (i = 0; i < pdata->num_devices; i++)
i2c_new_device(&i2c->adap, pdata->devices + i);
}
return 0;
add_adapter_failed:
free_irq(res2->start, i2c);
request_irq_failed:
iounmap(i2c->base);
map_failed:
release_mem_region(res->start, resource_size(res));
request_mem_failed:
kfree(i2c);
return ret;
}
static int __devexit ocores_i2c_remove(struct platform_device* pdev)
{
struct ocores_i2c *i2c = platform_get_drvdata(pdev);
struct resource *res;
/* disable i2c logic */
oc_setreg(i2c, OCI2C_CONTROL, oc_getreg(i2c, OCI2C_CONTROL)
......@@ -304,18 +362,6 @@ static int __devexit ocores_i2c_remove(struct platform_device* pdev)
i2c_del_adapter(&i2c->adap);
platform_set_drvdata(pdev, NULL);
res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
if (res)
free_irq(res->start, 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;
}
......@@ -344,6 +390,16 @@ static int ocores_i2c_resume(struct platform_device *pdev)
#define ocores_i2c_resume NULL
#endif
#ifdef CONFIG_OF
static struct of_device_id ocores_i2c_match[] = {
{
.compatible = "opencores,i2c-ocores",
},
{},
};
MODULE_DEVICE_TABLE(of, ocores_i2c_match);
#endif
/* work with hotplug and coldplug */
MODULE_ALIAS("platform:ocores-i2c");
......@@ -355,6 +411,9 @@ static struct platform_driver ocores_i2c_driver = {
.driver = {
.owner = THIS_MODULE,
.name = "ocores-i2c",
#ifdef CONFIG_OF
.of_match_table = ocores_i2c_match,
#endif
},
};
......
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