^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * CE4100 PCI-I2C glue code for PXA's driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * The CE4100's I2C device is more or less the same one as found on PXA.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * It does not support slave mode, the register slightly moved. This PCI
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * device provides three bars, every contains a single I2C controller.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/pci.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/platform_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/platform_data/i2c-pxa.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/of.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/of_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/of_address.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #define CE4100_PCI_I2C_DEVS 3
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) struct ce4100_devices {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) struct platform_device *pdev[CE4100_PCI_I2C_DEVS];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) static struct platform_device *add_i2c_device(struct pci_dev *dev, int bar)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) struct platform_device *pdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) struct i2c_pxa_platform_data pdata;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) struct resource res[2];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) struct device_node *child;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) static int devnum;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) memset(&pdata, 0, sizeof(struct i2c_pxa_platform_data));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) memset(&res, 0, sizeof(res));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) res[0].flags = IORESOURCE_MEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) res[0].start = pci_resource_start(dev, bar);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) res[0].end = pci_resource_end(dev, bar);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) res[1].flags = IORESOURCE_IRQ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) res[1].start = dev->irq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) res[1].end = dev->irq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) for_each_child_of_node(dev->dev.of_node, child) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) const void *prop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) struct resource r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) ret = of_address_to_resource(child, 0, &r);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) if (r.start != res[0].start)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) if (r.end != res[0].end)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) if (r.flags != res[0].flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) prop = of_get_property(child, "fast-mode", NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) if (prop)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) pdata.fast_mode = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) if (!child) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) dev_err(&dev->dev, "failed to match a DT node for bar %d.\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) bar);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) pdev = platform_device_alloc("ce4100-i2c", devnum);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) if (!pdev) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) of_node_put(child);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) ret = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) pdev->dev.parent = &dev->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) pdev->dev.of_node = child;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) ret = platform_device_add_resources(pdev, res, ARRAY_SIZE(res));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) goto err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) ret = platform_device_add_data(pdev, &pdata, sizeof(pdata));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) goto err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) ret = platform_device_add(pdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) goto err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) devnum++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) return pdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) err:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) platform_device_put(pdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) return ERR_PTR(ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) static int ce4100_i2c_probe(struct pci_dev *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) const struct pci_device_id *ent)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) struct ce4100_devices *sds;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) ret = pci_enable_device_mem(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) if (!dev->dev.of_node) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) dev_err(&dev->dev, "Missing device tree node.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) sds = kzalloc(sizeof(*sds), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) if (!sds) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) ret = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) goto err_mem;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) for (i = 0; i < ARRAY_SIZE(sds->pdev); i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) sds->pdev[i] = add_i2c_device(dev, i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) if (IS_ERR(sds->pdev[i])) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) ret = PTR_ERR(sds->pdev[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) while (--i >= 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) platform_device_unregister(sds->pdev[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) goto err_dev_add;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) pci_set_drvdata(dev, sds);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) err_dev_add:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) kfree(sds);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) err_mem:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) pci_disable_device(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) static const struct pci_device_id ce4100_i2c_devices[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) { PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x2e68)},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) { },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) static struct pci_driver ce4100_i2c_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) .driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) .suppress_bind_attrs = true,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) .name = "ce4100_i2c",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) .id_table = ce4100_i2c_devices,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) .probe = ce4100_i2c_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) builtin_pci_driver(ce4100_i2c_driver);
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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