| // SPDX-License-Identifier: GPL-2.0+ |
| // |
| // Copyright (C) 2011 Samsung Electronics Co.Ltd |
| // Author: Joonyoung Shim <jy0922.shim@samsung.com> |
| |
| #include <linux/clk.h> |
| #include <linux/delay.h> |
| #include <linux/err.h> |
| #include <linux/io.h> |
| #include <linux/platform_device.h> |
| #include <mach/map.h> |
| #include <plat/cpu.h> |
| #include <plat/usb-phy.h> |
| |
| #include "regs-sys-s3c64xx.h" |
| #include "regs-usb-hsotg-phy-s3c64xx.h" |
| |
| enum samsung_usb_phy_type { |
| USB_PHY_TYPE_DEVICE, |
| USB_PHY_TYPE_HOST, |
| }; |
| |
| static int s3c_usb_otgphy_init(struct platform_device *pdev) |
| { |
| struct clk *xusbxti; |
| u32 phyclk; |
| |
| writel(readl(S3C64XX_OTHERS) | S3C64XX_OTHERS_USBMASK, S3C64XX_OTHERS); |
| |
| /* set clock frequency for PLL */ |
| phyclk = readl(S3C_PHYCLK) & ~S3C_PHYCLK_CLKSEL_MASK; |
| |
| xusbxti = clk_get(&pdev->dev, "xusbxti"); |
| if (!IS_ERR(xusbxti)) { |
| switch (clk_get_rate(xusbxti)) { |
| case 12 * MHZ: |
| phyclk |= S3C_PHYCLK_CLKSEL_12M; |
| break; |
| case 24 * MHZ: |
| phyclk |= S3C_PHYCLK_CLKSEL_24M; |
| break; |
| default: |
| case 48 * MHZ: |
| /* default reference clock */ |
| break; |
| } |
| clk_put(xusbxti); |
| } |
| |
| /* TODO: select external clock/oscillator */ |
| writel(phyclk | S3C_PHYCLK_CLK_FORCE, S3C_PHYCLK); |
| |
| /* set to normal OTG PHY */ |
| writel((readl(S3C_PHYPWR) & ~S3C_PHYPWR_NORMAL_MASK), S3C_PHYPWR); |
| mdelay(1); |
| |
| /* reset OTG PHY and Link */ |
| writel(S3C_RSTCON_PHY | S3C_RSTCON_HCLK | S3C_RSTCON_PHYCLK, |
| S3C_RSTCON); |
| udelay(20); /* at-least 10uS */ |
| writel(0, S3C_RSTCON); |
| |
| return 0; |
| } |
| |
| static int s3c_usb_otgphy_exit(struct platform_device *pdev) |
| { |
| writel((readl(S3C_PHYPWR) | S3C_PHYPWR_ANALOG_POWERDOWN | |
| S3C_PHYPWR_OTG_DISABLE), S3C_PHYPWR); |
| |
| writel(readl(S3C64XX_OTHERS) & ~S3C64XX_OTHERS_USBMASK, S3C64XX_OTHERS); |
| |
| return 0; |
| } |
| |
| int s3c_usb_phy_init(struct platform_device *pdev, int type) |
| { |
| if (type == USB_PHY_TYPE_DEVICE) |
| return s3c_usb_otgphy_init(pdev); |
| |
| return -EINVAL; |
| } |
| |
| int s3c_usb_phy_exit(struct platform_device *pdev, int type) |
| { |
| if (type == USB_PHY_TYPE_DEVICE) |
| return s3c_usb_otgphy_exit(pdev); |
| |
| return -EINVAL; |
| } |