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