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180 lines
4.4 KiB
180 lines
4.4 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/** |
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* tusb1210.c - TUSB1210 USB ULPI PHY driver |
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* |
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* Copyright (C) 2015 Intel Corporation |
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* |
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* Author: Heikki Krogerus <[email protected]> |
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*/ |
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#include <linux/module.h> |
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#include <linux/bitfield.h> |
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#include <linux/ulpi/driver.h> |
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#include <linux/ulpi/regs.h> |
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#include <linux/gpio/consumer.h> |
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#include <linux/phy/ulpi_phy.h> |
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#define TUSB1210_VENDOR_SPECIFIC2 0x80 |
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#define TUSB1210_VENDOR_SPECIFIC2_IHSTX_MASK GENMASK(3, 0) |
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#define TUSB1210_VENDOR_SPECIFIC2_ZHSDRV_MASK GENMASK(5, 4) |
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#define TUSB1210_VENDOR_SPECIFIC2_DP_MASK BIT(6) |
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struct tusb1210 { |
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struct ulpi *ulpi; |
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struct phy *phy; |
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struct gpio_desc *gpio_reset; |
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struct gpio_desc *gpio_cs; |
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u8 vendor_specific2; |
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}; |
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static int tusb1210_power_on(struct phy *phy) |
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{ |
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struct tusb1210 *tusb = phy_get_drvdata(phy); |
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gpiod_set_value_cansleep(tusb->gpio_reset, 1); |
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gpiod_set_value_cansleep(tusb->gpio_cs, 1); |
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/* Restore the optional eye diagram optimization value */ |
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if (tusb->vendor_specific2) |
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ulpi_write(tusb->ulpi, TUSB1210_VENDOR_SPECIFIC2, |
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tusb->vendor_specific2); |
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return 0; |
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} |
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static int tusb1210_power_off(struct phy *phy) |
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{ |
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struct tusb1210 *tusb = phy_get_drvdata(phy); |
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gpiod_set_value_cansleep(tusb->gpio_reset, 0); |
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gpiod_set_value_cansleep(tusb->gpio_cs, 0); |
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return 0; |
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} |
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static int tusb1210_set_mode(struct phy *phy, enum phy_mode mode, int submode) |
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{ |
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struct tusb1210 *tusb = phy_get_drvdata(phy); |
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int ret; |
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ret = ulpi_read(tusb->ulpi, ULPI_OTG_CTRL); |
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if (ret < 0) |
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return ret; |
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switch (mode) { |
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case PHY_MODE_USB_HOST: |
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ret |= (ULPI_OTG_CTRL_DRVVBUS_EXT |
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| ULPI_OTG_CTRL_ID_PULLUP |
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| ULPI_OTG_CTRL_DP_PULLDOWN |
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| ULPI_OTG_CTRL_DM_PULLDOWN); |
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ulpi_write(tusb->ulpi, ULPI_OTG_CTRL, ret); |
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ret |= ULPI_OTG_CTRL_DRVVBUS; |
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break; |
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case PHY_MODE_USB_DEVICE: |
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ret &= ~(ULPI_OTG_CTRL_DRVVBUS |
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| ULPI_OTG_CTRL_DP_PULLDOWN |
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| ULPI_OTG_CTRL_DM_PULLDOWN); |
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ulpi_write(tusb->ulpi, ULPI_OTG_CTRL, ret); |
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ret &= ~ULPI_OTG_CTRL_DRVVBUS_EXT; |
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break; |
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default: |
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/* nothing */ |
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return 0; |
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} |
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return ulpi_write(tusb->ulpi, ULPI_OTG_CTRL, ret); |
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} |
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static const struct phy_ops phy_ops = { |
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.power_on = tusb1210_power_on, |
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.power_off = tusb1210_power_off, |
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.set_mode = tusb1210_set_mode, |
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.owner = THIS_MODULE, |
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}; |
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static int tusb1210_probe(struct ulpi *ulpi) |
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{ |
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struct tusb1210 *tusb; |
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u8 val, reg; |
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tusb = devm_kzalloc(&ulpi->dev, sizeof(*tusb), GFP_KERNEL); |
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if (!tusb) |
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return -ENOMEM; |
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tusb->gpio_reset = devm_gpiod_get_optional(&ulpi->dev, "reset", |
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GPIOD_OUT_LOW); |
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if (IS_ERR(tusb->gpio_reset)) |
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return PTR_ERR(tusb->gpio_reset); |
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gpiod_set_value_cansleep(tusb->gpio_reset, 1); |
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tusb->gpio_cs = devm_gpiod_get_optional(&ulpi->dev, "cs", |
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GPIOD_OUT_LOW); |
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if (IS_ERR(tusb->gpio_cs)) |
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return PTR_ERR(tusb->gpio_cs); |
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gpiod_set_value_cansleep(tusb->gpio_cs, 1); |
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/* |
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* VENDOR_SPECIFIC2 register in TUSB1210 can be used for configuring eye |
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* diagram optimization and DP/DM swap. |
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*/ |
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reg = ulpi_read(ulpi, TUSB1210_VENDOR_SPECIFIC2); |
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/* High speed output drive strength configuration */ |
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if (!device_property_read_u8(&ulpi->dev, "ihstx", &val)) |
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u8p_replace_bits(®, val, (u8)TUSB1210_VENDOR_SPECIFIC2_IHSTX_MASK); |
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/* High speed output impedance configuration */ |
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if (!device_property_read_u8(&ulpi->dev, "zhsdrv", &val)) |
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u8p_replace_bits(®, val, (u8)TUSB1210_VENDOR_SPECIFIC2_ZHSDRV_MASK); |
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/* DP/DM swap control */ |
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if (!device_property_read_u8(&ulpi->dev, "datapolarity", &val)) |
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u8p_replace_bits(®, val, (u8)TUSB1210_VENDOR_SPECIFIC2_DP_MASK); |
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ulpi_write(ulpi, TUSB1210_VENDOR_SPECIFIC2, reg); |
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tusb->vendor_specific2 = reg; |
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tusb->phy = ulpi_phy_create(ulpi, &phy_ops); |
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if (IS_ERR(tusb->phy)) |
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return PTR_ERR(tusb->phy); |
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tusb->ulpi = ulpi; |
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phy_set_drvdata(tusb->phy, tusb); |
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ulpi_set_drvdata(ulpi, tusb); |
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return 0; |
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} |
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static void tusb1210_remove(struct ulpi *ulpi) |
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{ |
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struct tusb1210 *tusb = ulpi_get_drvdata(ulpi); |
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ulpi_phy_destroy(ulpi, tusb->phy); |
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} |
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#define TI_VENDOR_ID 0x0451 |
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static const struct ulpi_device_id tusb1210_ulpi_id[] = { |
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{ TI_VENDOR_ID, 0x1507, }, /* TUSB1210 */ |
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{ TI_VENDOR_ID, 0x1508, }, /* TUSB1211 */ |
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{ }, |
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}; |
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MODULE_DEVICE_TABLE(ulpi, tusb1210_ulpi_id); |
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static struct ulpi_driver tusb1210_driver = { |
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.id_table = tusb1210_ulpi_id, |
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.probe = tusb1210_probe, |
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.remove = tusb1210_remove, |
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.driver = { |
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.name = "tusb1210", |
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.owner = THIS_MODULE, |
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}, |
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}; |
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module_ulpi_driver(tusb1210_driver); |
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MODULE_AUTHOR("Intel Corporation"); |
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MODULE_LICENSE("GPL v2"); |
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MODULE_DESCRIPTION("TUSB1210 ULPI PHY driver");
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