^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) * i2c-versatile.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (C) 2006 ARM Ltd.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * written by Russell King, Deep Blue Solutions Ltd.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/i2c.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/i2c-algo-bit.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/platform_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/io.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #define I2C_CONTROL 0x00
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #define I2C_CONTROLS 0x00
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #define I2C_CONTROLC 0x04
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #define SCL (1 << 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #define SDA (1 << 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) struct i2c_versatile {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) struct i2c_adapter adap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) struct i2c_algo_bit_data algo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) void __iomem *base;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) static void i2c_versatile_setsda(void *data, int state)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) struct i2c_versatile *i2c = data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) writel(SDA, i2c->base + (state ? I2C_CONTROLS : I2C_CONTROLC));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) static void i2c_versatile_setscl(void *data, int state)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) struct i2c_versatile *i2c = data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) writel(SCL, i2c->base + (state ? I2C_CONTROLS : I2C_CONTROLC));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) static int i2c_versatile_getsda(void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) struct i2c_versatile *i2c = data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) return !!(readl(i2c->base + I2C_CONTROL) & SDA);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) static int i2c_versatile_getscl(void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) struct i2c_versatile *i2c = data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) return !!(readl(i2c->base + I2C_CONTROL) & SCL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) static const struct i2c_algo_bit_data i2c_versatile_algo = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) .setsda = i2c_versatile_setsda,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) .setscl = i2c_versatile_setscl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) .getsda = i2c_versatile_getsda,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) .getscl = i2c_versatile_getscl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) .udelay = 30,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) .timeout = HZ,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) static int i2c_versatile_probe(struct platform_device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) struct i2c_versatile *i2c;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) struct resource *r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) i2c = devm_kzalloc(&dev->dev, sizeof(struct i2c_versatile), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) if (!i2c)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) r = platform_get_resource(dev, IORESOURCE_MEM, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) i2c->base = devm_ioremap_resource(&dev->dev, r);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) if (IS_ERR(i2c->base))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) return PTR_ERR(i2c->base);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) writel(SCL | SDA, i2c->base + I2C_CONTROLS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) i2c->adap.owner = THIS_MODULE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) strlcpy(i2c->adap.name, "Versatile I2C adapter", sizeof(i2c->adap.name));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) i2c->adap.algo_data = &i2c->algo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) i2c->adap.dev.parent = &dev->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) i2c->adap.dev.of_node = dev->dev.of_node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) i2c->algo = i2c_versatile_algo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) i2c->algo.data = i2c;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) i2c->adap.nr = dev->id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) ret = i2c_bit_add_numbered_bus(&i2c->adap);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) platform_set_drvdata(dev, i2c);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) static int i2c_versatile_remove(struct platform_device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) struct i2c_versatile *i2c = platform_get_drvdata(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) i2c_del_adapter(&i2c->adap);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) static const struct of_device_id i2c_versatile_match[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) { .compatible = "arm,versatile-i2c", },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) {},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) MODULE_DEVICE_TABLE(of, i2c_versatile_match);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) static struct platform_driver i2c_versatile_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) .probe = i2c_versatile_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) .remove = i2c_versatile_remove,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) .driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) .name = "versatile-i2c",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) .of_match_table = i2c_versatile_match,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) },
^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) static int __init i2c_versatile_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) return platform_driver_register(&i2c_versatile_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) static void __exit i2c_versatile_exit(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) platform_driver_unregister(&i2c_versatile_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) subsys_initcall(i2c_versatile_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) module_exit(i2c_versatile_exit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) MODULE_DESCRIPTION("ARM Versatile I2C bus driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) MODULE_ALIAS("platform:versatile-i2c");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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