292 lines
7.8 KiB
C
292 lines
7.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2011 Marvell International Ltd. All rights reserved.
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* Copyright (C) 2018,2019 Lubomir Rintel <lkundrak@v3.sk>
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*/
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#include <linux/delay.h>
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#include <linux/io.h>
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#include <linux/module.h>
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#include <linux/phy/phy.h>
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#include <linux/platform_device.h>
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#include <linux/soc/mmp/cputype.h>
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#define USB2_PLL_REG0 0x4
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#define USB2_PLL_REG1 0x8
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#define USB2_TX_REG0 0x10
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#define USB2_TX_REG1 0x14
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#define USB2_TX_REG2 0x18
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#define USB2_RX_REG0 0x20
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#define USB2_RX_REG1 0x24
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#define USB2_RX_REG2 0x28
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#define USB2_ANA_REG0 0x30
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#define USB2_ANA_REG1 0x34
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#define USB2_ANA_REG2 0x38
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#define USB2_DIG_REG0 0x3C
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#define USB2_DIG_REG1 0x40
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#define USB2_DIG_REG2 0x44
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#define USB2_DIG_REG3 0x48
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#define USB2_TEST_REG0 0x4C
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#define USB2_TEST_REG1 0x50
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#define USB2_TEST_REG2 0x54
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#define USB2_CHARGER_REG0 0x58
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#define USB2_OTG_REG0 0x5C
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#define USB2_PHY_MON0 0x60
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#define USB2_RESETVE_REG0 0x64
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#define USB2_ICID_REG0 0x78
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#define USB2_ICID_REG1 0x7C
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/* USB2_PLL_REG0 */
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/* This is for Ax stepping */
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#define USB2_PLL_FBDIV_SHIFT_MMP3 0
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#define USB2_PLL_FBDIV_MASK_MMP3 (0xFF << 0)
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#define USB2_PLL_REFDIV_SHIFT_MMP3 8
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#define USB2_PLL_REFDIV_MASK_MMP3 (0xF << 8)
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#define USB2_PLL_VDD12_SHIFT_MMP3 12
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#define USB2_PLL_VDD18_SHIFT_MMP3 14
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/* This is for B0 stepping */
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#define USB2_PLL_FBDIV_SHIFT_MMP3_B0 0
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#define USB2_PLL_REFDIV_SHIFT_MMP3_B0 9
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#define USB2_PLL_VDD18_SHIFT_MMP3_B0 14
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#define USB2_PLL_FBDIV_MASK_MMP3_B0 0x01FF
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#define USB2_PLL_REFDIV_MASK_MMP3_B0 0x3E00
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#define USB2_PLL_CAL12_SHIFT_MMP3 0
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#define USB2_PLL_CALI12_MASK_MMP3 (0x3 << 0)
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#define USB2_PLL_VCOCAL_START_SHIFT_MMP3 2
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#define USB2_PLL_KVCO_SHIFT_MMP3 4
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#define USB2_PLL_KVCO_MASK_MMP3 (0x7<<4)
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#define USB2_PLL_ICP_SHIFT_MMP3 8
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#define USB2_PLL_ICP_MASK_MMP3 (0x7<<8)
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#define USB2_PLL_LOCK_BYPASS_SHIFT_MMP3 12
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#define USB2_PLL_PU_PLL_SHIFT_MMP3 13
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#define USB2_PLL_PU_PLL_MASK (0x1 << 13)
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#define USB2_PLL_READY_MASK_MMP3 (0x1 << 15)
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/* USB2_TX_REG0 */
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#define USB2_TX_IMPCAL_VTH_SHIFT_MMP3 8
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#define USB2_TX_IMPCAL_VTH_MASK_MMP3 (0x7 << 8)
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#define USB2_TX_RCAL_START_SHIFT_MMP3 13
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/* USB2_TX_REG1 */
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#define USB2_TX_CK60_PHSEL_SHIFT_MMP3 0
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#define USB2_TX_CK60_PHSEL_MASK_MMP3 (0xf << 0)
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#define USB2_TX_AMP_SHIFT_MMP3 4
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#define USB2_TX_AMP_MASK_MMP3 (0x7 << 4)
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#define USB2_TX_VDD12_SHIFT_MMP3 8
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#define USB2_TX_VDD12_MASK_MMP3 (0x3 << 8)
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/* USB2_TX_REG2 */
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#define USB2_TX_DRV_SLEWRATE_SHIFT 10
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/* USB2_RX_REG0 */
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#define USB2_RX_SQ_THRESH_SHIFT_MMP3 4
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#define USB2_RX_SQ_THRESH_MASK_MMP3 (0xf << 4)
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#define USB2_RX_SQ_LENGTH_SHIFT_MMP3 10
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#define USB2_RX_SQ_LENGTH_MASK_MMP3 (0x3 << 10)
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/* USB2_ANA_REG1*/
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#define USB2_ANA_PU_ANA_SHIFT_MMP3 14
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/* USB2_OTG_REG0 */
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#define USB2_OTG_PU_OTG_SHIFT_MMP3 3
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struct mmp3_usb_phy {
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struct phy *phy;
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void __iomem *base;
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};
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static unsigned int u2o_get(void __iomem *base, unsigned int offset)
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{
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return readl_relaxed(base + offset);
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}
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static void u2o_set(void __iomem *base, unsigned int offset,
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unsigned int value)
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{
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u32 reg;
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reg = readl_relaxed(base + offset);
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reg |= value;
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writel_relaxed(reg, base + offset);
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readl_relaxed(base + offset);
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}
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static void u2o_clear(void __iomem *base, unsigned int offset,
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unsigned int value)
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{
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u32 reg;
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reg = readl_relaxed(base + offset);
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reg &= ~value;
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writel_relaxed(reg, base + offset);
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readl_relaxed(base + offset);
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}
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static int mmp3_usb_phy_init(struct phy *phy)
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{
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struct mmp3_usb_phy *mmp3_usb_phy = phy_get_drvdata(phy);
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void __iomem *base = mmp3_usb_phy->base;
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if (cpu_is_mmp3_a0()) {
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u2o_clear(base, USB2_PLL_REG0, (USB2_PLL_FBDIV_MASK_MMP3
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| USB2_PLL_REFDIV_MASK_MMP3));
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u2o_set(base, USB2_PLL_REG0,
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0xd << USB2_PLL_REFDIV_SHIFT_MMP3
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| 0xf0 << USB2_PLL_FBDIV_SHIFT_MMP3);
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} else if (cpu_is_mmp3_b0()) {
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u2o_clear(base, USB2_PLL_REG0, USB2_PLL_REFDIV_MASK_MMP3_B0
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| USB2_PLL_FBDIV_MASK_MMP3_B0);
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u2o_set(base, USB2_PLL_REG0,
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0xd << USB2_PLL_REFDIV_SHIFT_MMP3_B0
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| 0xf0 << USB2_PLL_FBDIV_SHIFT_MMP3_B0);
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} else {
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dev_err(&phy->dev, "unsupported silicon revision\n");
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return -ENODEV;
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}
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u2o_clear(base, USB2_PLL_REG1, USB2_PLL_PU_PLL_MASK
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| USB2_PLL_ICP_MASK_MMP3
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| USB2_PLL_KVCO_MASK_MMP3
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| USB2_PLL_CALI12_MASK_MMP3);
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u2o_set(base, USB2_PLL_REG1, 1 << USB2_PLL_PU_PLL_SHIFT_MMP3
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| 1 << USB2_PLL_LOCK_BYPASS_SHIFT_MMP3
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| 3 << USB2_PLL_ICP_SHIFT_MMP3
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| 3 << USB2_PLL_KVCO_SHIFT_MMP3
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| 3 << USB2_PLL_CAL12_SHIFT_MMP3);
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u2o_clear(base, USB2_TX_REG0, USB2_TX_IMPCAL_VTH_MASK_MMP3);
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u2o_set(base, USB2_TX_REG0, 2 << USB2_TX_IMPCAL_VTH_SHIFT_MMP3);
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u2o_clear(base, USB2_TX_REG1, USB2_TX_VDD12_MASK_MMP3
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| USB2_TX_AMP_MASK_MMP3
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| USB2_TX_CK60_PHSEL_MASK_MMP3);
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u2o_set(base, USB2_TX_REG1, 3 << USB2_TX_VDD12_SHIFT_MMP3
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| 4 << USB2_TX_AMP_SHIFT_MMP3
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| 4 << USB2_TX_CK60_PHSEL_SHIFT_MMP3);
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u2o_clear(base, USB2_TX_REG2, 3 << USB2_TX_DRV_SLEWRATE_SHIFT);
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u2o_set(base, USB2_TX_REG2, 2 << USB2_TX_DRV_SLEWRATE_SHIFT);
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u2o_clear(base, USB2_RX_REG0, USB2_RX_SQ_THRESH_MASK_MMP3);
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u2o_set(base, USB2_RX_REG0, 0xa << USB2_RX_SQ_THRESH_SHIFT_MMP3);
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u2o_set(base, USB2_ANA_REG1, 0x1 << USB2_ANA_PU_ANA_SHIFT_MMP3);
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u2o_set(base, USB2_OTG_REG0, 0x1 << USB2_OTG_PU_OTG_SHIFT_MMP3);
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return 0;
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}
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static int mmp3_usb_phy_calibrate(struct phy *phy)
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{
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struct mmp3_usb_phy *mmp3_usb_phy = phy_get_drvdata(phy);
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void __iomem *base = mmp3_usb_phy->base;
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int loops;
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/*
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* PLL VCO and TX Impedance Calibration Timing:
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*
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* _____________________________________
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* PU __________|
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* _____________________________
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* VCOCAL START _________|
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* ___
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* REG_RCAL_START ________________| |________|_______
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* | 200us | 400us | 40| 400us | USB PHY READY
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*/
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udelay(200);
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u2o_set(base, USB2_PLL_REG1, 1 << USB2_PLL_VCOCAL_START_SHIFT_MMP3);
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udelay(400);
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u2o_set(base, USB2_TX_REG0, 1 << USB2_TX_RCAL_START_SHIFT_MMP3);
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udelay(40);
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u2o_clear(base, USB2_TX_REG0, 1 << USB2_TX_RCAL_START_SHIFT_MMP3);
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udelay(400);
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loops = 0;
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while ((u2o_get(base, USB2_PLL_REG1) & USB2_PLL_READY_MASK_MMP3) == 0) {
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mdelay(1);
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loops++;
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if (loops > 100) {
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dev_err(&phy->dev, "PLL_READY not set after 100mS.\n");
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return -ETIMEDOUT;
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}
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}
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return 0;
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}
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static const struct phy_ops mmp3_usb_phy_ops = {
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.init = mmp3_usb_phy_init,
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.calibrate = mmp3_usb_phy_calibrate,
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.owner = THIS_MODULE,
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};
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static const struct of_device_id mmp3_usb_phy_of_match[] = {
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{ .compatible = "marvell,mmp3-usb-phy", },
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{ },
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};
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MODULE_DEVICE_TABLE(of, mmp3_usb_phy_of_match);
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static int mmp3_usb_phy_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct resource *resource;
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struct mmp3_usb_phy *mmp3_usb_phy;
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struct phy_provider *provider;
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mmp3_usb_phy = devm_kzalloc(dev, sizeof(*mmp3_usb_phy), GFP_KERNEL);
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if (!mmp3_usb_phy)
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return -ENOMEM;
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resource = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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mmp3_usb_phy->base = devm_ioremap_resource(dev, resource);
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if (IS_ERR(mmp3_usb_phy->base)) {
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dev_err(dev, "failed to remap PHY regs\n");
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return PTR_ERR(mmp3_usb_phy->base);
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}
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mmp3_usb_phy->phy = devm_phy_create(dev, NULL, &mmp3_usb_phy_ops);
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if (IS_ERR(mmp3_usb_phy->phy)) {
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dev_err(dev, "failed to create PHY\n");
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return PTR_ERR(mmp3_usb_phy->phy);
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}
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phy_set_drvdata(mmp3_usb_phy->phy, mmp3_usb_phy);
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provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
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if (IS_ERR(provider)) {
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dev_err(dev, "failed to register PHY provider\n");
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return PTR_ERR(provider);
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}
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return 0;
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}
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static struct platform_driver mmp3_usb_phy_driver = {
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.probe = mmp3_usb_phy_probe,
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.driver = {
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.name = "mmp3-usb-phy",
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.of_match_table = mmp3_usb_phy_of_match,
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},
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};
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module_platform_driver(mmp3_usb_phy_driver);
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MODULE_AUTHOR("Lubomir Rintel <lkundrak@v3.sk>");
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MODULE_DESCRIPTION("Marvell MMP3 USB PHY Driver");
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MODULE_LICENSE("GPL v2");
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