/** * tusb1210.c - TUSB1210 USB ULPI PHY driver * * Copyright (C) 2015 Intel Corporation * * Author: Heikki Krogerus <heikki.krogerus@linux.intel.com> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #include <linux/module.h> #include <linux/ulpi/driver.h> #include <linux/ulpi/regs.h> #include <linux/gpio/consumer.h> #include <linux/phy/ulpi_phy.h> #define TUSB1210_VENDOR_SPECIFIC2 0x80 #define TUSB1210_VENDOR_SPECIFIC2_IHSTX_SHIFT 0 #define TUSB1210_VENDOR_SPECIFIC2_ZHSDRV_SHIFT 4 #define TUSB1210_VENDOR_SPECIFIC2_DP_SHIFT 6 struct tusb1210 { struct ulpi *ulpi; struct phy *phy; struct gpio_desc *gpio_reset; struct gpio_desc *gpio_cs; u8 vendor_specific2; }; static int tusb1210_power_on(struct phy *phy) { struct tusb1210 *tusb = phy_get_drvdata(phy); gpiod_set_value_cansleep(tusb->gpio_reset, 1); gpiod_set_value_cansleep(tusb->gpio_cs, 1); /* Restore the optional eye diagram optimization value */ if (tusb->vendor_specific2) ulpi_write(tusb->ulpi, TUSB1210_VENDOR_SPECIFIC2, tusb->vendor_specific2); return 0; } static int tusb1210_power_off(struct phy *phy) { struct tusb1210 *tusb = phy_get_drvdata(phy); gpiod_set_value_cansleep(tusb->gpio_reset, 0); gpiod_set_value_cansleep(tusb->gpio_cs, 0); return 0; } static int tusb1210_set_mode(struct phy *phy, enum phy_mode mode) { struct tusb1210 *tusb = phy_get_drvdata(phy); int ret; ret = ulpi_read(tusb->ulpi, ULPI_OTG_CTRL); if (ret < 0) return ret; switch (mode) { case PHY_MODE_USB_HOST: ret |= (ULPI_OTG_CTRL_DRVVBUS_EXT | ULPI_OTG_CTRL_ID_PULLUP | ULPI_OTG_CTRL_DP_PULLDOWN | ULPI_OTG_CTRL_DM_PULLDOWN); ulpi_write(tusb->ulpi, ULPI_OTG_CTRL, ret); ret |= ULPI_OTG_CTRL_DRVVBUS; break; case PHY_MODE_USB_DEVICE: ret &= ~(ULPI_OTG_CTRL_DRVVBUS | ULPI_OTG_CTRL_DP_PULLDOWN | ULPI_OTG_CTRL_DM_PULLDOWN); ulpi_write(tusb->ulpi, ULPI_OTG_CTRL, ret); ret &= ~ULPI_OTG_CTRL_DRVVBUS_EXT; break; default: /* nothing */ return 0; } return ulpi_write(tusb->ulpi, ULPI_OTG_CTRL, ret); } static const struct phy_ops phy_ops = { .power_on = tusb1210_power_on, .power_off = tusb1210_power_off, .set_mode = tusb1210_set_mode, .owner = THIS_MODULE, }; static int tusb1210_probe(struct ulpi *ulpi) { struct tusb1210 *tusb; u8 val, reg; tusb = devm_kzalloc(&ulpi->dev, sizeof(*tusb), GFP_KERNEL); if (!tusb) return -ENOMEM; tusb->gpio_reset = devm_gpiod_get_optional(&ulpi->dev, "reset", GPIOD_OUT_LOW); if (IS_ERR(tusb->gpio_reset)) return PTR_ERR(tusb->gpio_reset); gpiod_set_value_cansleep(tusb->gpio_reset, 1); tusb->gpio_cs = devm_gpiod_get_optional(&ulpi->dev, "cs", GPIOD_OUT_LOW); if (IS_ERR(tusb->gpio_cs)) return PTR_ERR(tusb->gpio_cs); gpiod_set_value_cansleep(tusb->gpio_cs, 1); /* * VENDOR_SPECIFIC2 register in TUSB1210 can be used for configuring eye * diagram optimization and DP/DM swap. */ /* High speed output drive strength configuration */ device_property_read_u8(&ulpi->dev, "ihstx", &val); reg = val << TUSB1210_VENDOR_SPECIFIC2_IHSTX_SHIFT; /* High speed output impedance configuration */ device_property_read_u8(&ulpi->dev, "zhsdrv", &val); reg |= val << TUSB1210_VENDOR_SPECIFIC2_ZHSDRV_SHIFT; /* DP/DM swap control */ device_property_read_u8(&ulpi->dev, "datapolarity", &val); reg |= val << TUSB1210_VENDOR_SPECIFIC2_DP_SHIFT; if (reg) { ulpi_write(ulpi, TUSB1210_VENDOR_SPECIFIC2, reg); tusb->vendor_specific2 = reg; } tusb->phy = ulpi_phy_create(ulpi, &phy_ops); if (IS_ERR(tusb->phy)) return PTR_ERR(tusb->phy); tusb->ulpi = ulpi; phy_set_drvdata(tusb->phy, tusb); ulpi_set_drvdata(ulpi, tusb); return 0; } static void tusb1210_remove(struct ulpi *ulpi) { struct tusb1210 *tusb = ulpi_get_drvdata(ulpi); ulpi_phy_destroy(ulpi, tusb->phy); } #define TI_VENDOR_ID 0x0451 static const struct ulpi_device_id tusb1210_ulpi_id[] = { { TI_VENDOR_ID, 0x1507, }, /* TUSB1210 */ { TI_VENDOR_ID, 0x1508, }, /* TUSB1211 */ { }, }; MODULE_DEVICE_TABLE(ulpi, tusb1210_ulpi_id); static struct ulpi_driver tusb1210_driver = { .id_table = tusb1210_ulpi_id, .probe = tusb1210_probe, .remove = tusb1210_remove, .driver = { .name = "tusb1210", .owner = THIS_MODULE, }, }; module_ulpi_driver(tusb1210_driver); MODULE_AUTHOR("Intel Corporation"); MODULE_LICENSE("GPL v2"); MODULE_DESCRIPTION("TUSB1210 ULPI PHY driver");