diff options
Diffstat (limited to 'drivers/i2c/busses/i2c-pxa-pci.c')
| -rw-r--r-- | drivers/i2c/busses/i2c-pxa-pci.c | 150 |
1 files changed, 150 insertions, 0 deletions
diff --git a/drivers/i2c/busses/i2c-pxa-pci.c b/drivers/i2c/busses/i2c-pxa-pci.c new file mode 100644 index 000000000..30e38bc8b --- /dev/null +++ b/drivers/i2c/busses/i2c-pxa-pci.c @@ -0,0 +1,150 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * CE4100 PCI-I2C glue code for PXA's driver + * Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de> + * + * 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/platform_data/i2c-pxa.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 = pcim_enable_device(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) + return -ENOMEM; + + 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); + 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); |