1/** 2 * tusb1210.c - TUSB1210 USB ULPI PHY driver 3 * 4 * Copyright (C) 2015 Intel Corporation 5 * 6 * Author: Heikki Krogerus <heikki.krogerus@linux.intel.com> 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License version 2 as 10 * published by the Free Software Foundation. 11 */ 12#include <linux/module.h> 13#include <linux/ulpi/driver.h> 14#include <linux/gpio/consumer.h> 15 16#include "ulpi_phy.h" 17 18#define TUSB1210_VENDOR_SPECIFIC2 0x80 19#define TUSB1210_VENDOR_SPECIFIC2_IHSTX_SHIFT 0 20#define TUSB1210_VENDOR_SPECIFIC2_ZHSDRV_SHIFT 4 21#define TUSB1210_VENDOR_SPECIFIC2_DP_SHIFT 6 22 23struct tusb1210 { 24 struct ulpi *ulpi; 25 struct phy *phy; 26 struct gpio_desc *gpio_reset; 27 struct gpio_desc *gpio_cs; 28 u8 vendor_specific2; 29}; 30 31static int tusb1210_power_on(struct phy *phy) 32{ 33 struct tusb1210 *tusb = phy_get_drvdata(phy); 34 35 gpiod_set_value_cansleep(tusb->gpio_reset, 1); 36 gpiod_set_value_cansleep(tusb->gpio_cs, 1); 37 38 /* Restore the optional eye diagram optimization value */ 39 if (tusb->vendor_specific2) 40 ulpi_write(tusb->ulpi, TUSB1210_VENDOR_SPECIFIC2, 41 tusb->vendor_specific2); 42 43 return 0; 44} 45 46static int tusb1210_power_off(struct phy *phy) 47{ 48 struct tusb1210 *tusb = phy_get_drvdata(phy); 49 50 gpiod_set_value_cansleep(tusb->gpio_reset, 0); 51 gpiod_set_value_cansleep(tusb->gpio_cs, 0); 52 53 return 0; 54} 55 56static const struct phy_ops phy_ops = { 57 .power_on = tusb1210_power_on, 58 .power_off = tusb1210_power_off, 59 .owner = THIS_MODULE, 60}; 61 62static int tusb1210_probe(struct ulpi *ulpi) 63{ 64 struct tusb1210 *tusb; 65 u8 val, reg; 66 67 tusb = devm_kzalloc(&ulpi->dev, sizeof(*tusb), GFP_KERNEL); 68 if (!tusb) 69 return -ENOMEM; 70 71 tusb->gpio_reset = devm_gpiod_get_optional(&ulpi->dev, "reset", 72 GPIOD_OUT_LOW); 73 if (IS_ERR(tusb->gpio_reset)) 74 return PTR_ERR(tusb->gpio_reset); 75 76 gpiod_set_value_cansleep(tusb->gpio_reset, 1); 77 78 tusb->gpio_cs = devm_gpiod_get_optional(&ulpi->dev, "cs", 79 GPIOD_OUT_LOW); 80 if (IS_ERR(tusb->gpio_cs)) 81 return PTR_ERR(tusb->gpio_cs); 82 83 gpiod_set_value_cansleep(tusb->gpio_cs, 1); 84 85 /* 86 * VENDOR_SPECIFIC2 register in TUSB1210 can be used for configuring eye 87 * diagram optimization and DP/DM swap. 88 */ 89 90 /* High speed output drive strength configuration */ 91 device_property_read_u8(&ulpi->dev, "ihstx", &val); 92 reg = val << TUSB1210_VENDOR_SPECIFIC2_IHSTX_SHIFT; 93 94 /* High speed output impedance configuration */ 95 device_property_read_u8(&ulpi->dev, "zhsdrv", &val); 96 reg |= val << TUSB1210_VENDOR_SPECIFIC2_ZHSDRV_SHIFT; 97 98 /* DP/DM swap control */ 99 device_property_read_u8(&ulpi->dev, "datapolarity", &val); 100 reg |= val << TUSB1210_VENDOR_SPECIFIC2_DP_SHIFT; 101 102 if (reg) { 103 ulpi_write(ulpi, TUSB1210_VENDOR_SPECIFIC2, reg); 104 tusb->vendor_specific2 = reg; 105 } 106 107 tusb->phy = ulpi_phy_create(ulpi, &phy_ops); 108 if (IS_ERR(tusb->phy)) 109 return PTR_ERR(tusb->phy); 110 111 tusb->ulpi = ulpi; 112 113 phy_set_drvdata(tusb->phy, tusb); 114 ulpi_set_drvdata(ulpi, tusb); 115 return 0; 116} 117 118static void tusb1210_remove(struct ulpi *ulpi) 119{ 120 struct tusb1210 *tusb = ulpi_get_drvdata(ulpi); 121 122 ulpi_phy_destroy(ulpi, tusb->phy); 123} 124 125#define TI_VENDOR_ID 0x0451 126 127static const struct ulpi_device_id tusb1210_ulpi_id[] = { 128 { TI_VENDOR_ID, 0x1507, }, 129 { }, 130}; 131MODULE_DEVICE_TABLE(ulpi, tusb1210_ulpi_id); 132 133static struct ulpi_driver tusb1210_driver = { 134 .id_table = tusb1210_ulpi_id, 135 .probe = tusb1210_probe, 136 .remove = tusb1210_remove, 137 .driver = { 138 .name = "tusb1210", 139 .owner = THIS_MODULE, 140 }, 141}; 142 143module_ulpi_driver(tusb1210_driver); 144 145MODULE_AUTHOR("Intel Corporation"); 146MODULE_LICENSE("GPL v2"); 147MODULE_DESCRIPTION("TUSB1210 ULPI PHY driver"); 148