155 строки
3.2 KiB
C
155 строки
3.2 KiB
C
/*
|
|
* CE4100 PCI-I2C glue code for PXA's driver
|
|
* Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
|
|
* License: GPL v2
|
|
*
|
|
* The CE4100's I2C device is more or less the same one as found on PXA.
|
|
* It does not support slave mode, the register slightly moved. This PCI
|
|
* device provides three bars, every contains a single I2C controller.
|
|
*/
|
|
#include <linux/init.h>
|
|
#include <linux/pci.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/i2c/pxa-i2c.h>
|
|
#include <linux/of.h>
|
|
#include <linux/of_device.h>
|
|
#include <linux/of_address.h>
|
|
|
|
#define CE4100_PCI_I2C_DEVS 3
|
|
|
|
struct ce4100_devices {
|
|
struct platform_device *pdev[CE4100_PCI_I2C_DEVS];
|
|
};
|
|
|
|
static struct platform_device *add_i2c_device(struct pci_dev *dev, int bar)
|
|
{
|
|
struct platform_device *pdev;
|
|
struct i2c_pxa_platform_data pdata;
|
|
struct resource res[2];
|
|
struct device_node *child;
|
|
static int devnum;
|
|
int ret;
|
|
|
|
memset(&pdata, 0, sizeof(struct i2c_pxa_platform_data));
|
|
memset(&res, 0, sizeof(res));
|
|
|
|
res[0].flags = IORESOURCE_MEM;
|
|
res[0].start = pci_resource_start(dev, bar);
|
|
res[0].end = pci_resource_end(dev, bar);
|
|
|
|
res[1].flags = IORESOURCE_IRQ;
|
|
res[1].start = dev->irq;
|
|
res[1].end = dev->irq;
|
|
|
|
for_each_child_of_node(dev->dev.of_node, child) {
|
|
const void *prop;
|
|
struct resource r;
|
|
int ret;
|
|
|
|
ret = of_address_to_resource(child, 0, &r);
|
|
if (ret < 0)
|
|
continue;
|
|
if (r.start != res[0].start)
|
|
continue;
|
|
if (r.end != res[0].end)
|
|
continue;
|
|
if (r.flags != res[0].flags)
|
|
continue;
|
|
|
|
prop = of_get_property(child, "fast-mode", NULL);
|
|
if (prop)
|
|
pdata.fast_mode = 1;
|
|
|
|
break;
|
|
}
|
|
|
|
if (!child) {
|
|
dev_err(&dev->dev, "failed to match a DT node for bar %d.\n",
|
|
bar);
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
pdev = platform_device_alloc("ce4100-i2c", devnum);
|
|
if (!pdev) {
|
|
of_node_put(child);
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
pdev->dev.parent = &dev->dev;
|
|
pdev->dev.of_node = child;
|
|
|
|
ret = platform_device_add_resources(pdev, res, ARRAY_SIZE(res));
|
|
if (ret)
|
|
goto err;
|
|
|
|
ret = platform_device_add_data(pdev, &pdata, sizeof(pdata));
|
|
if (ret)
|
|
goto err;
|
|
|
|
ret = platform_device_add(pdev);
|
|
if (ret)
|
|
goto err;
|
|
devnum++;
|
|
return pdev;
|
|
err:
|
|
platform_device_put(pdev);
|
|
out:
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
static int ce4100_i2c_probe(struct pci_dev *dev,
|
|
const struct pci_device_id *ent)
|
|
{
|
|
int ret;
|
|
int i;
|
|
struct ce4100_devices *sds;
|
|
|
|
ret = pci_enable_device_mem(dev);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (!dev->dev.of_node) {
|
|
dev_err(&dev->dev, "Missing device tree node.\n");
|
|
return -EINVAL;
|
|
}
|
|
sds = kzalloc(sizeof(*sds), GFP_KERNEL);
|
|
if (!sds) {
|
|
ret = -ENOMEM;
|
|
goto err_mem;
|
|
}
|
|
|
|
for (i = 0; i < ARRAY_SIZE(sds->pdev); i++) {
|
|
sds->pdev[i] = add_i2c_device(dev, i);
|
|
if (IS_ERR(sds->pdev[i])) {
|
|
ret = PTR_ERR(sds->pdev[i]);
|
|
while (--i >= 0)
|
|
platform_device_unregister(sds->pdev[i]);
|
|
goto err_dev_add;
|
|
}
|
|
}
|
|
pci_set_drvdata(dev, sds);
|
|
return 0;
|
|
|
|
err_dev_add:
|
|
kfree(sds);
|
|
err_mem:
|
|
pci_disable_device(dev);
|
|
return ret;
|
|
}
|
|
|
|
static const struct pci_device_id ce4100_i2c_devices[] = {
|
|
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x2e68)},
|
|
{ },
|
|
};
|
|
|
|
static struct pci_driver ce4100_i2c_driver = {
|
|
.driver = {
|
|
.suppress_bind_attrs = true,
|
|
},
|
|
.name = "ce4100_i2c",
|
|
.id_table = ce4100_i2c_devices,
|
|
.probe = ce4100_i2c_probe,
|
|
};
|
|
builtin_pci_driver(ce4100_i2c_driver);
|