339 lines
8.9 KiB
C
339 lines
8.9 KiB
C
/*
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* Copyright (C) 2011 Marvell International Ltd. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/platform_device.h>
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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/usb/otg.h>
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#include <linux/platform_data/mv_usb.h>
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#include "phy-mv-u3d-usb.h"
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/*
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* struct mv_u3d_phy - transceiver driver state
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* @phy: transceiver structure
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* @dev: The parent device supplied to the probe function
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* @clk: usb phy clock
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* @base: usb phy register memory base
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*/
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struct mv_u3d_phy {
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struct usb_phy phy;
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struct mv_usb_platform_data *plat;
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struct device *dev;
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struct clk *clk;
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void __iomem *base;
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};
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static u32 mv_u3d_phy_read(void __iomem *base, u32 reg)
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{
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void __iomem *addr, *data;
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addr = base;
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data = base + 0x4;
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writel_relaxed(reg, addr);
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return readl_relaxed(data);
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}
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static void mv_u3d_phy_set(void __iomem *base, u32 reg, u32 value)
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{
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void __iomem *addr, *data;
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u32 tmp;
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addr = base;
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data = base + 0x4;
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writel_relaxed(reg, addr);
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tmp = readl_relaxed(data);
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tmp |= value;
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writel_relaxed(tmp, data);
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}
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static void mv_u3d_phy_clear(void __iomem *base, u32 reg, u32 value)
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{
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void __iomem *addr, *data;
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u32 tmp;
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addr = base;
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data = base + 0x4;
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writel_relaxed(reg, addr);
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tmp = readl_relaxed(data);
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tmp &= ~value;
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writel_relaxed(tmp, data);
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}
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static void mv_u3d_phy_write(void __iomem *base, u32 reg, u32 value)
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{
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void __iomem *addr, *data;
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addr = base;
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data = base + 0x4;
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writel_relaxed(reg, addr);
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writel_relaxed(value, data);
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}
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void mv_u3d_phy_shutdown(struct usb_phy *phy)
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{
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struct mv_u3d_phy *mv_u3d_phy;
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void __iomem *base;
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u32 val;
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mv_u3d_phy = container_of(phy, struct mv_u3d_phy, phy);
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base = mv_u3d_phy->base;
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/* Power down Reference Analog current, bit 15
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* Power down PLL, bit 14
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* Power down Receiver, bit 13
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* Power down Transmitter, bit 12
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* of USB3_POWER_PLL_CONTROL register
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*/
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val = mv_u3d_phy_read(base, USB3_POWER_PLL_CONTROL);
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val &= ~(USB3_POWER_PLL_CONTROL_PU);
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mv_u3d_phy_write(base, USB3_POWER_PLL_CONTROL, val);
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if (mv_u3d_phy->clk)
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clk_disable(mv_u3d_phy->clk);
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}
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static int mv_u3d_phy_init(struct usb_phy *phy)
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{
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struct mv_u3d_phy *mv_u3d_phy;
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void __iomem *base;
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u32 val, count;
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/* enable usb3 phy */
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mv_u3d_phy = container_of(phy, struct mv_u3d_phy, phy);
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if (mv_u3d_phy->clk)
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clk_enable(mv_u3d_phy->clk);
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base = mv_u3d_phy->base;
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val = mv_u3d_phy_read(base, USB3_POWER_PLL_CONTROL);
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val &= ~(USB3_POWER_PLL_CONTROL_PU_MASK);
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val |= 0xF << USB3_POWER_PLL_CONTROL_PU_SHIFT;
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mv_u3d_phy_write(base, USB3_POWER_PLL_CONTROL, val);
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udelay(100);
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mv_u3d_phy_write(base, USB3_RESET_CONTROL,
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USB3_RESET_CONTROL_RESET_PIPE);
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udelay(100);
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mv_u3d_phy_write(base, USB3_RESET_CONTROL,
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USB3_RESET_CONTROL_RESET_PIPE
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| USB3_RESET_CONTROL_RESET_PHY);
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udelay(100);
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val = mv_u3d_phy_read(base, USB3_POWER_PLL_CONTROL);
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val &= ~(USB3_POWER_PLL_CONTROL_REF_FREF_SEL_MASK
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| USB3_POWER_PLL_CONTROL_PHY_MODE_MASK);
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val |= (USB3_PLL_25MHZ << USB3_POWER_PLL_CONTROL_REF_FREF_SEL_SHIFT)
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| (0x5 << USB3_POWER_PLL_CONTROL_PHY_MODE_SHIFT);
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mv_u3d_phy_write(base, USB3_POWER_PLL_CONTROL, val);
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udelay(100);
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mv_u3d_phy_clear(base, USB3_KVCO_CALI_CONTROL,
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USB3_KVCO_CALI_CONTROL_USE_MAX_PLL_RATE_MASK);
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udelay(100);
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val = mv_u3d_phy_read(base, USB3_SQUELCH_FFE);
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val &= ~(USB3_SQUELCH_FFE_FFE_CAP_SEL_MASK
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| USB3_SQUELCH_FFE_FFE_RES_SEL_MASK
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| USB3_SQUELCH_FFE_SQ_THRESH_IN_MASK);
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val |= ((0xD << USB3_SQUELCH_FFE_FFE_CAP_SEL_SHIFT)
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| (0x7 << USB3_SQUELCH_FFE_FFE_RES_SEL_SHIFT)
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| (0x8 << USB3_SQUELCH_FFE_SQ_THRESH_IN_SHIFT));
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mv_u3d_phy_write(base, USB3_SQUELCH_FFE, val);
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udelay(100);
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val = mv_u3d_phy_read(base, USB3_GEN1_SET0);
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val &= ~USB3_GEN1_SET0_G1_TX_SLEW_CTRL_EN_MASK;
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val |= 1 << USB3_GEN1_SET0_G1_TX_EMPH_EN_SHIFT;
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mv_u3d_phy_write(base, USB3_GEN1_SET0, val);
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udelay(100);
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val = mv_u3d_phy_read(base, USB3_GEN2_SET0);
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val &= ~(USB3_GEN2_SET0_G2_TX_AMP_MASK
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| USB3_GEN2_SET0_G2_TX_EMPH_AMP_MASK
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| USB3_GEN2_SET0_G2_TX_SLEW_CTRL_EN_MASK);
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val |= ((0x14 << USB3_GEN2_SET0_G2_TX_AMP_SHIFT)
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| (1 << USB3_GEN2_SET0_G2_TX_AMP_ADJ_SHIFT)
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| (0xA << USB3_GEN2_SET0_G2_TX_EMPH_AMP_SHIFT)
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| (1 << USB3_GEN2_SET0_G2_TX_EMPH_EN_SHIFT));
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mv_u3d_phy_write(base, USB3_GEN2_SET0, val);
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udelay(100);
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mv_u3d_phy_read(base, USB3_TX_EMPPH);
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val &= ~(USB3_TX_EMPPH_AMP_MASK
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| USB3_TX_EMPPH_EN_MASK
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| USB3_TX_EMPPH_AMP_FORCE_MASK
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| USB3_TX_EMPPH_PAR1_MASK
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| USB3_TX_EMPPH_PAR2_MASK);
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val |= ((0xB << USB3_TX_EMPPH_AMP_SHIFT)
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| (1 << USB3_TX_EMPPH_EN_SHIFT)
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| (1 << USB3_TX_EMPPH_AMP_FORCE_SHIFT)
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| (0x1C << USB3_TX_EMPPH_PAR1_SHIFT)
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| (1 << USB3_TX_EMPPH_PAR2_SHIFT));
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mv_u3d_phy_write(base, USB3_TX_EMPPH, val);
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udelay(100);
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val = mv_u3d_phy_read(base, USB3_GEN2_SET1);
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val &= ~(USB3_GEN2_SET1_G2_RX_SELMUPI_MASK
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| USB3_GEN2_SET1_G2_RX_SELMUPF_MASK
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| USB3_GEN2_SET1_G2_RX_SELMUFI_MASK
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| USB3_GEN2_SET1_G2_RX_SELMUFF_MASK);
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val |= ((1 << USB3_GEN2_SET1_G2_RX_SELMUPI_SHIFT)
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| (1 << USB3_GEN2_SET1_G2_RX_SELMUPF_SHIFT)
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| (1 << USB3_GEN2_SET1_G2_RX_SELMUFI_SHIFT)
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| (1 << USB3_GEN2_SET1_G2_RX_SELMUFF_SHIFT));
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mv_u3d_phy_write(base, USB3_GEN2_SET1, val);
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udelay(100);
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val = mv_u3d_phy_read(base, USB3_DIGITAL_LOOPBACK_EN);
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val &= ~USB3_DIGITAL_LOOPBACK_EN_SEL_BITS_MASK;
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val |= 1 << USB3_DIGITAL_LOOPBACK_EN_SEL_BITS_SHIFT;
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mv_u3d_phy_write(base, USB3_DIGITAL_LOOPBACK_EN, val);
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udelay(100);
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val = mv_u3d_phy_read(base, USB3_IMPEDANCE_TX_SSC);
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val &= ~USB3_IMPEDANCE_TX_SSC_SSC_AMP_MASK;
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val |= 0xC << USB3_IMPEDANCE_TX_SSC_SSC_AMP_SHIFT;
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mv_u3d_phy_write(base, USB3_IMPEDANCE_TX_SSC, val);
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udelay(100);
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val = mv_u3d_phy_read(base, USB3_IMPEDANCE_CALI_CTRL);
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val &= ~USB3_IMPEDANCE_CALI_CTRL_IMP_CAL_THR_MASK;
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val |= 0x4 << USB3_IMPEDANCE_CALI_CTRL_IMP_CAL_THR_SHIFT;
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mv_u3d_phy_write(base, USB3_IMPEDANCE_CALI_CTRL, val);
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udelay(100);
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val = mv_u3d_phy_read(base, USB3_PHY_ISOLATION_MODE);
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val &= ~(USB3_PHY_ISOLATION_MODE_PHY_GEN_RX_MASK
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| USB3_PHY_ISOLATION_MODE_PHY_GEN_TX_MASK
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| USB3_PHY_ISOLATION_MODE_TX_DRV_IDLE_MASK);
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val |= ((1 << USB3_PHY_ISOLATION_MODE_PHY_GEN_RX_SHIFT)
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| (1 << USB3_PHY_ISOLATION_MODE_PHY_GEN_TX_SHIFT));
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mv_u3d_phy_write(base, USB3_PHY_ISOLATION_MODE, val);
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udelay(100);
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val = mv_u3d_phy_read(base, USB3_TXDETRX);
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val &= ~(USB3_TXDETRX_VTHSEL_MASK);
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val |= 0x1 << USB3_TXDETRX_VTHSEL_SHIFT;
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mv_u3d_phy_write(base, USB3_TXDETRX, val);
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udelay(100);
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dev_dbg(mv_u3d_phy->dev, "start calibration\n");
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calstart:
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/* Perform Manual Calibration */
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mv_u3d_phy_set(base, USB3_KVCO_CALI_CONTROL,
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1 << USB3_KVCO_CALI_CONTROL_CAL_START_SHIFT);
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mdelay(1);
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count = 0;
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while (1) {
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val = mv_u3d_phy_read(base, USB3_KVCO_CALI_CONTROL);
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if (val & (1 << USB3_KVCO_CALI_CONTROL_CAL_DONE_SHIFT))
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break;
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else if (count > 50) {
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dev_dbg(mv_u3d_phy->dev, "calibration failure, retry...\n");
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goto calstart;
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}
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count++;
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mdelay(1);
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}
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/* active PIPE interface */
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mv_u3d_phy_write(base, USB3_PIPE_SM_CTRL,
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1 << USB3_PIPE_SM_CTRL_PHY_INIT_DONE);
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return 0;
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}
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static int mv_u3d_phy_probe(struct platform_device *pdev)
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{
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struct mv_u3d_phy *mv_u3d_phy;
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struct mv_usb_platform_data *pdata;
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struct device *dev = &pdev->dev;
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struct resource *res;
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void __iomem *phy_base;
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int ret;
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pdata = pdev->dev.platform_data;
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if (!pdata) {
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dev_err(&pdev->dev, "%s: no platform data defined\n", __func__);
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return -EINVAL;
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}
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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phy_base = devm_ioremap_resource(dev, res);
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if (IS_ERR(phy_base))
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return PTR_ERR(phy_base);
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mv_u3d_phy = devm_kzalloc(dev, sizeof(*mv_u3d_phy), GFP_KERNEL);
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if (!mv_u3d_phy)
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return -ENOMEM;
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mv_u3d_phy->dev = &pdev->dev;
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mv_u3d_phy->plat = pdata;
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mv_u3d_phy->base = phy_base;
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mv_u3d_phy->phy.dev = mv_u3d_phy->dev;
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mv_u3d_phy->phy.label = "mv-u3d-phy";
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mv_u3d_phy->phy.init = mv_u3d_phy_init;
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mv_u3d_phy->phy.shutdown = mv_u3d_phy_shutdown;
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ret = usb_add_phy(&mv_u3d_phy->phy, USB_PHY_TYPE_USB3);
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if (ret)
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goto err;
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if (!mv_u3d_phy->clk)
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mv_u3d_phy->clk = clk_get(mv_u3d_phy->dev, "u3dphy");
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platform_set_drvdata(pdev, mv_u3d_phy);
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dev_info(&pdev->dev, "Initialized Marvell USB 3.0 PHY\n");
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err:
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return ret;
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}
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static int mv_u3d_phy_remove(struct platform_device *pdev)
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{
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struct mv_u3d_phy *mv_u3d_phy = platform_get_drvdata(pdev);
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usb_remove_phy(&mv_u3d_phy->phy);
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if (mv_u3d_phy->clk) {
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clk_put(mv_u3d_phy->clk);
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mv_u3d_phy->clk = NULL;
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}
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return 0;
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}
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static struct platform_driver mv_u3d_phy_driver = {
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.probe = mv_u3d_phy_probe,
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.remove = mv_u3d_phy_remove,
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.driver = {
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.name = "mv-u3d-phy",
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.owner = THIS_MODULE,
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},
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};
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module_platform_driver(mv_u3d_phy_driver);
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MODULE_DESCRIPTION("Marvell USB 3.0 PHY controller");
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MODULE_AUTHOR("Yu Xu <yuxu@marvell.com>");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:mv-u3d-phy");
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