1 // SPDX-License-Identifier: GPL-2.0+ 2 // 3 // Copyright (C) 2011 Samsung Electronics Co.Ltd 4 // Author: Joonyoung Shim <jy0922.shim@samsung.com> 5 6 #include <linux/clk.h> 7 #include <linux/delay.h> 8 #include <linux/err.h> 9 #include <linux/io.h> 10 #include <linux/platform_device.h> 11 #include "map.h" 12 #include "cpu.h" 13 #include "usb-phy.h" 14 15 #include "regs-sys-s3c64xx.h" 16 #include "regs-usb-hsotg-phy-s3c64xx.h" 17 18 enum samsung_usb_phy_type { 19 USB_PHY_TYPE_DEVICE, 20 USB_PHY_TYPE_HOST, 21 }; 22 23 static int s3c_usb_otgphy_init(struct platform_device *pdev) 24 { 25 struct clk *xusbxti; 26 u32 phyclk; 27 28 writel(readl(S3C64XX_OTHERS) | S3C64XX_OTHERS_USBMASK, S3C64XX_OTHERS); 29 30 /* set clock frequency for PLL */ 31 phyclk = readl(S3C_PHYCLK) & ~S3C_PHYCLK_CLKSEL_MASK; 32 33 xusbxti = clk_get(&pdev->dev, "xusbxti"); 34 if (!IS_ERR(xusbxti)) { 35 switch (clk_get_rate(xusbxti)) { 36 case 12 * MHZ: 37 phyclk |= S3C_PHYCLK_CLKSEL_12M; 38 break; 39 case 24 * MHZ: 40 phyclk |= S3C_PHYCLK_CLKSEL_24M; 41 break; 42 default: 43 case 48 * MHZ: 44 /* default reference clock */ 45 break; 46 } 47 clk_put(xusbxti); 48 } 49 50 /* TODO: select external clock/oscillator */ 51 writel(phyclk | S3C_PHYCLK_CLK_FORCE, S3C_PHYCLK); 52 53 /* set to normal OTG PHY */ 54 writel((readl(S3C_PHYPWR) & ~S3C_PHYPWR_NORMAL_MASK), S3C_PHYPWR); 55 mdelay(1); 56 57 /* reset OTG PHY and Link */ 58 writel(S3C_RSTCON_PHY | S3C_RSTCON_HCLK | S3C_RSTCON_PHYCLK, 59 S3C_RSTCON); 60 udelay(20); /* at-least 10uS */ 61 writel(0, S3C_RSTCON); 62 63 return 0; 64 } 65 66 static int s3c_usb_otgphy_exit(struct platform_device *pdev) 67 { 68 writel((readl(S3C_PHYPWR) | S3C_PHYPWR_ANALOG_POWERDOWN | 69 S3C_PHYPWR_OTG_DISABLE), S3C_PHYPWR); 70 71 writel(readl(S3C64XX_OTHERS) & ~S3C64XX_OTHERS_USBMASK, S3C64XX_OTHERS); 72 73 return 0; 74 } 75 76 int s3c_usb_phy_init(struct platform_device *pdev, int type) 77 { 78 if (type == USB_PHY_TYPE_DEVICE) 79 return s3c_usb_otgphy_init(pdev); 80 81 return -EINVAL; 82 } 83 84 int s3c_usb_phy_exit(struct platform_device *pdev, int type) 85 { 86 if (type == USB_PHY_TYPE_DEVICE) 87 return s3c_usb_otgphy_exit(pdev); 88 89 return -EINVAL; 90 } 91