| // SPDX-License-Identifier: GPL-2.0-or-later |
| /* |
| * omap-control-phy.c - The PHY part of control module. |
| * |
| * Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.com |
| * Author: Kishon Vijay Abraham I <kishon@ti.com> |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/platform_device.h> |
| #include <linux/slab.h> |
| #include <linux/of.h> |
| #include <linux/of_device.h> |
| #include <linux/err.h> |
| #include <linux/io.h> |
| #include <linux/clk.h> |
| #include <linux/phy/omap_control_phy.h> |
| |
| /** |
| * omap_control_pcie_pcs - set the PCS delay count |
| * @dev: the control module device |
| * @delay: 8 bit delay value |
| */ |
| void omap_control_pcie_pcs(struct device *dev, u8 delay) |
| { |
| u32 val; |
| struct omap_control_phy *control_phy; |
| |
| if (IS_ERR_OR_NULL(dev)) { |
| pr_err("%s: invalid device\n", __func__); |
| return; |
| } |
| |
| control_phy = dev_get_drvdata(dev); |
| if (!control_phy) { |
| dev_err(dev, "%s: invalid control phy device\n", __func__); |
| return; |
| } |
| |
| if (control_phy->type != OMAP_CTRL_TYPE_PCIE) { |
| dev_err(dev, "%s: unsupported operation\n", __func__); |
| return; |
| } |
| |
| val = readl(control_phy->pcie_pcs); |
| val &= ~(OMAP_CTRL_PCIE_PCS_MASK << |
| OMAP_CTRL_PCIE_PCS_DELAY_COUNT_SHIFT); |
| val |= (delay << OMAP_CTRL_PCIE_PCS_DELAY_COUNT_SHIFT); |
| writel(val, control_phy->pcie_pcs); |
| } |
| EXPORT_SYMBOL_GPL(omap_control_pcie_pcs); |
| |
| /** |
| * omap_control_phy_power - power on/off the phy using control module reg |
| * @dev: the control module device |
| * @on: 0 or 1, based on powering on or off the PHY |
| */ |
| void omap_control_phy_power(struct device *dev, int on) |
| { |
| u32 val; |
| unsigned long rate; |
| struct omap_control_phy *control_phy; |
| |
| if (IS_ERR_OR_NULL(dev)) { |
| pr_err("%s: invalid device\n", __func__); |
| return; |
| } |
| |
| control_phy = dev_get_drvdata(dev); |
| if (!control_phy) { |
| dev_err(dev, "%s: invalid control phy device\n", __func__); |
| return; |
| } |
| |
| if (control_phy->type == OMAP_CTRL_TYPE_OTGHS) |
| return; |
| |
| val = readl(control_phy->power); |
| |
| switch (control_phy->type) { |
| case OMAP_CTRL_TYPE_USB2: |
| if (on) |
| val &= ~OMAP_CTRL_DEV_PHY_PD; |
| else |
| val |= OMAP_CTRL_DEV_PHY_PD; |
| break; |
| |
| case OMAP_CTRL_TYPE_PCIE: |
| case OMAP_CTRL_TYPE_PIPE3: |
| rate = clk_get_rate(control_phy->sys_clk); |
| rate = rate/1000000; |
| |
| if (on) { |
| val &= ~(OMAP_CTRL_PIPE3_PHY_PWRCTL_CLK_CMD_MASK | |
| OMAP_CTRL_PIPE3_PHY_PWRCTL_CLK_FREQ_MASK); |
| val |= OMAP_CTRL_PIPE3_PHY_TX_RX_POWERON << |
| OMAP_CTRL_PIPE3_PHY_PWRCTL_CLK_CMD_SHIFT; |
| val |= rate << |
| OMAP_CTRL_PIPE3_PHY_PWRCTL_CLK_FREQ_SHIFT; |
| } else { |
| val &= ~OMAP_CTRL_PIPE3_PHY_PWRCTL_CLK_CMD_MASK; |
| val |= OMAP_CTRL_PIPE3_PHY_TX_RX_POWEROFF << |
| OMAP_CTRL_PIPE3_PHY_PWRCTL_CLK_CMD_SHIFT; |
| } |
| break; |
| |
| case OMAP_CTRL_TYPE_DRA7USB2: |
| if (on) |
| val &= ~OMAP_CTRL_USB2_PHY_PD; |
| else |
| val |= OMAP_CTRL_USB2_PHY_PD; |
| break; |
| |
| case OMAP_CTRL_TYPE_AM437USB2: |
| if (on) { |
| val &= ~(AM437X_CTRL_USB2_PHY_PD | |
| AM437X_CTRL_USB2_OTG_PD); |
| val |= (AM437X_CTRL_USB2_OTGVDET_EN | |
| AM437X_CTRL_USB2_OTGSESSEND_EN); |
| } else { |
| val &= ~(AM437X_CTRL_USB2_OTGVDET_EN | |
| AM437X_CTRL_USB2_OTGSESSEND_EN); |
| val |= (AM437X_CTRL_USB2_PHY_PD | |
| AM437X_CTRL_USB2_OTG_PD); |
| } |
| break; |
| default: |
| dev_err(dev, "%s: type %d not recognized\n", |
| __func__, control_phy->type); |
| break; |
| } |
| |
| writel(val, control_phy->power); |
| } |
| EXPORT_SYMBOL_GPL(omap_control_phy_power); |
| |
| /** |
| * omap_control_usb_host_mode - set AVALID, VBUSVALID and ID pin in grounded |
| * @ctrl_phy: struct omap_control_phy * |
| * |
| * Writes to the mailbox register to notify the usb core that a usb |
| * device has been connected. |
| */ |
| static void omap_control_usb_host_mode(struct omap_control_phy *ctrl_phy) |
| { |
| u32 val; |
| |
| val = readl(ctrl_phy->otghs_control); |
| val &= ~(OMAP_CTRL_DEV_IDDIG | OMAP_CTRL_DEV_SESSEND); |
| val |= OMAP_CTRL_DEV_AVALID | OMAP_CTRL_DEV_VBUSVALID; |
| writel(val, ctrl_phy->otghs_control); |
| } |
| |
| /** |
| * omap_control_usb_device_mode - set AVALID, VBUSVALID and ID pin in high |
| * impedance |
| * @ctrl_phy: struct omap_control_phy * |
| * |
| * Writes to the mailbox register to notify the usb core that it has been |
| * connected to a usb host. |
| */ |
| static void omap_control_usb_device_mode(struct omap_control_phy *ctrl_phy) |
| { |
| u32 val; |
| |
| val = readl(ctrl_phy->otghs_control); |
| val &= ~OMAP_CTRL_DEV_SESSEND; |
| val |= OMAP_CTRL_DEV_IDDIG | OMAP_CTRL_DEV_AVALID | |
| OMAP_CTRL_DEV_VBUSVALID; |
| writel(val, ctrl_phy->otghs_control); |
| } |
| |
| /** |
| * omap_control_usb_set_sessionend - Enable SESSIONEND and IDIG to high |
| * impedance |
| * @ctrl_phy: struct omap_control_phy * |
| * |
| * Writes to the mailbox register to notify the usb core it's now in |
| * disconnected state. |
| */ |
| static void omap_control_usb_set_sessionend(struct omap_control_phy *ctrl_phy) |
| { |
| u32 val; |
| |
| val = readl(ctrl_phy->otghs_control); |
| val &= ~(OMAP_CTRL_DEV_AVALID | OMAP_CTRL_DEV_VBUSVALID); |
| val |= OMAP_CTRL_DEV_IDDIG | OMAP_CTRL_DEV_SESSEND; |
| writel(val, ctrl_phy->otghs_control); |
| } |
| |
| /** |
| * omap_control_usb_set_mode - Calls to functions to set USB in one of host mode |
| * or device mode or to denote disconnected state |
| * @dev: the control module device |
| * @mode: The mode to which usb should be configured |
| * |
| * This is an API to write to the mailbox register to notify the usb core that |
| * a usb device has been connected. |
| */ |
| void omap_control_usb_set_mode(struct device *dev, |
| enum omap_control_usb_mode mode) |
| { |
| struct omap_control_phy *ctrl_phy; |
| |
| if (IS_ERR_OR_NULL(dev)) |
| return; |
| |
| ctrl_phy = dev_get_drvdata(dev); |
| if (!ctrl_phy) { |
| dev_err(dev, "Invalid control phy device\n"); |
| return; |
| } |
| |
| if (ctrl_phy->type != OMAP_CTRL_TYPE_OTGHS) |
| return; |
| |
| switch (mode) { |
| case USB_MODE_HOST: |
| omap_control_usb_host_mode(ctrl_phy); |
| break; |
| case USB_MODE_DEVICE: |
| omap_control_usb_device_mode(ctrl_phy); |
| break; |
| case USB_MODE_DISCONNECT: |
| omap_control_usb_set_sessionend(ctrl_phy); |
| break; |
| default: |
| dev_vdbg(dev, "invalid omap control usb mode\n"); |
| } |
| } |
| EXPORT_SYMBOL_GPL(omap_control_usb_set_mode); |
| |
| static const enum omap_control_phy_type otghs_data = OMAP_CTRL_TYPE_OTGHS; |
| static const enum omap_control_phy_type usb2_data = OMAP_CTRL_TYPE_USB2; |
| static const enum omap_control_phy_type pipe3_data = OMAP_CTRL_TYPE_PIPE3; |
| static const enum omap_control_phy_type pcie_data = OMAP_CTRL_TYPE_PCIE; |
| static const enum omap_control_phy_type dra7usb2_data = OMAP_CTRL_TYPE_DRA7USB2; |
| static const enum omap_control_phy_type am437usb2_data = OMAP_CTRL_TYPE_AM437USB2; |
| |
| static const struct of_device_id omap_control_phy_id_table[] = { |
| { |
| .compatible = "ti,control-phy-otghs", |
| .data = &otghs_data, |
| }, |
| { |
| .compatible = "ti,control-phy-usb2", |
| .data = &usb2_data, |
| }, |
| { |
| .compatible = "ti,control-phy-pipe3", |
| .data = &pipe3_data, |
| }, |
| { |
| .compatible = "ti,control-phy-pcie", |
| .data = &pcie_data, |
| }, |
| { |
| .compatible = "ti,control-phy-usb2-dra7", |
| .data = &dra7usb2_data, |
| }, |
| { |
| .compatible = "ti,control-phy-usb2-am437", |
| .data = &am437usb2_data, |
| }, |
| {}, |
| }; |
| MODULE_DEVICE_TABLE(of, omap_control_phy_id_table); |
| |
| static int omap_control_phy_probe(struct platform_device *pdev) |
| { |
| const struct of_device_id *of_id; |
| struct omap_control_phy *control_phy; |
| |
| of_id = of_match_device(omap_control_phy_id_table, &pdev->dev); |
| if (!of_id) |
| return -EINVAL; |
| |
| control_phy = devm_kzalloc(&pdev->dev, sizeof(*control_phy), |
| GFP_KERNEL); |
| if (!control_phy) |
| return -ENOMEM; |
| |
| control_phy->dev = &pdev->dev; |
| control_phy->type = *(enum omap_control_phy_type *)of_id->data; |
| |
| if (control_phy->type == OMAP_CTRL_TYPE_OTGHS) { |
| control_phy->otghs_control = |
| devm_platform_ioremap_resource_byname(pdev, "otghs_control"); |
| if (IS_ERR(control_phy->otghs_control)) |
| return PTR_ERR(control_phy->otghs_control); |
| } else { |
| control_phy->power = |
| devm_platform_ioremap_resource_byname(pdev, "power"); |
| if (IS_ERR(control_phy->power)) { |
| dev_err(&pdev->dev, "Couldn't get power register\n"); |
| return PTR_ERR(control_phy->power); |
| } |
| } |
| |
| if (control_phy->type == OMAP_CTRL_TYPE_PIPE3 || |
| control_phy->type == OMAP_CTRL_TYPE_PCIE) { |
| control_phy->sys_clk = devm_clk_get(control_phy->dev, |
| "sys_clkin"); |
| if (IS_ERR(control_phy->sys_clk)) { |
| pr_err("%s: unable to get sys_clkin\n", __func__); |
| return -EINVAL; |
| } |
| } |
| |
| if (control_phy->type == OMAP_CTRL_TYPE_PCIE) { |
| control_phy->pcie_pcs = |
| devm_platform_ioremap_resource_byname(pdev, "pcie_pcs"); |
| if (IS_ERR(control_phy->pcie_pcs)) |
| return PTR_ERR(control_phy->pcie_pcs); |
| } |
| |
| dev_set_drvdata(control_phy->dev, control_phy); |
| |
| return 0; |
| } |
| |
| static struct platform_driver omap_control_phy_driver = { |
| .probe = omap_control_phy_probe, |
| .driver = { |
| .name = "omap-control-phy", |
| .of_match_table = omap_control_phy_id_table, |
| }, |
| }; |
| |
| static int __init omap_control_phy_init(void) |
| { |
| return platform_driver_register(&omap_control_phy_driver); |
| } |
| subsys_initcall(omap_control_phy_init); |
| |
| static void __exit omap_control_phy_exit(void) |
| { |
| platform_driver_unregister(&omap_control_phy_driver); |
| } |
| module_exit(omap_control_phy_exit); |
| |
| MODULE_ALIAS("platform:omap_control_phy"); |
| MODULE_AUTHOR("Texas Instruments Inc."); |
| MODULE_DESCRIPTION("OMAP Control Module PHY Driver"); |
| MODULE_LICENSE("GPL v2"); |