288 lines
8.5 KiB
C
288 lines
8.5 KiB
C
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/*
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* Copyright (c) 2014, The Linux Foundation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/io.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/time.h>
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#include <linux/delay.h>
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#include <linux/clk.h>
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#include <linux/slab.h>
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#include <linux/platform_device.h>
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#include <linux/phy/phy.h>
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/* PHY registers */
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#define UNIPHY_PLL_REFCLK_CFG 0x000
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#define UNIPHY_PLL_PWRGEN_CFG 0x014
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#define UNIPHY_PLL_GLB_CFG 0x020
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#define UNIPHY_PLL_SDM_CFG0 0x038
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#define UNIPHY_PLL_SDM_CFG1 0x03C
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#define UNIPHY_PLL_SDM_CFG2 0x040
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#define UNIPHY_PLL_SDM_CFG3 0x044
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#define UNIPHY_PLL_SDM_CFG4 0x048
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#define UNIPHY_PLL_SSC_CFG0 0x04C
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#define UNIPHY_PLL_SSC_CFG1 0x050
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#define UNIPHY_PLL_SSC_CFG2 0x054
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#define UNIPHY_PLL_SSC_CFG3 0x058
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#define UNIPHY_PLL_LKDET_CFG0 0x05C
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#define UNIPHY_PLL_LKDET_CFG1 0x060
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#define UNIPHY_PLL_LKDET_CFG2 0x064
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#define UNIPHY_PLL_CAL_CFG0 0x06C
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#define UNIPHY_PLL_CAL_CFG8 0x08C
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#define UNIPHY_PLL_CAL_CFG9 0x090
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#define UNIPHY_PLL_CAL_CFG10 0x094
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#define UNIPHY_PLL_CAL_CFG11 0x098
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#define UNIPHY_PLL_STATUS 0x0C0
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#define SATA_PHY_SER_CTRL 0x100
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#define SATA_PHY_TX_DRIV_CTRL0 0x104
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#define SATA_PHY_TX_DRIV_CTRL1 0x108
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#define SATA_PHY_TX_IMCAL0 0x11C
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#define SATA_PHY_TX_IMCAL2 0x124
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#define SATA_PHY_RX_IMCAL0 0x128
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#define SATA_PHY_EQUAL 0x13C
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#define SATA_PHY_OOB_TERM 0x144
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#define SATA_PHY_CDR_CTRL0 0x148
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#define SATA_PHY_CDR_CTRL1 0x14C
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#define SATA_PHY_CDR_CTRL2 0x150
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#define SATA_PHY_CDR_CTRL3 0x154
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#define SATA_PHY_PI_CTRL0 0x168
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#define SATA_PHY_POW_DWN_CTRL0 0x180
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#define SATA_PHY_POW_DWN_CTRL1 0x184
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#define SATA_PHY_TX_DATA_CTRL 0x188
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#define SATA_PHY_ALIGNP 0x1A4
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#define SATA_PHY_TX_IMCAL_STAT 0x1E4
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#define SATA_PHY_RX_IMCAL_STAT 0x1E8
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#define UNIPHY_PLL_LOCK BIT(0)
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#define SATA_PHY_TX_CAL BIT(0)
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#define SATA_PHY_RX_CAL BIT(0)
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/* default timeout set to 1 sec */
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#define TIMEOUT_MS 10000
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#define DELAY_INTERVAL_US 100
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struct qcom_apq8064_sata_phy {
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void __iomem *mmio;
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struct clk *cfg_clk;
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struct device *dev;
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};
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/* Helper function to do poll and timeout */
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static int read_poll_timeout(void __iomem *addr, u32 mask)
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{
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unsigned long timeout = jiffies + msecs_to_jiffies(TIMEOUT_MS);
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do {
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if (readl_relaxed(addr) & mask)
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return 0;
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usleep_range(DELAY_INTERVAL_US, DELAY_INTERVAL_US + 50);
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} while (!time_after(jiffies, timeout));
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return (readl_relaxed(addr) & mask) ? 0 : -ETIMEDOUT;
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}
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static int qcom_apq8064_sata_phy_init(struct phy *generic_phy)
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{
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struct qcom_apq8064_sata_phy *phy = phy_get_drvdata(generic_phy);
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void __iomem *base = phy->mmio;
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int ret = 0;
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/* SATA phy initialization */
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writel_relaxed(0x01, base + SATA_PHY_SER_CTRL);
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writel_relaxed(0xB1, base + SATA_PHY_POW_DWN_CTRL0);
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/* Make sure the power down happens before power up */
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mb();
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usleep_range(10, 60);
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writel_relaxed(0x01, base + SATA_PHY_POW_DWN_CTRL0);
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writel_relaxed(0x3E, base + SATA_PHY_POW_DWN_CTRL1);
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writel_relaxed(0x01, base + SATA_PHY_RX_IMCAL0);
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writel_relaxed(0x01, base + SATA_PHY_TX_IMCAL0);
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writel_relaxed(0x02, base + SATA_PHY_TX_IMCAL2);
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/* Write UNIPHYPLL registers to configure PLL */
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writel_relaxed(0x04, base + UNIPHY_PLL_REFCLK_CFG);
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writel_relaxed(0x00, base + UNIPHY_PLL_PWRGEN_CFG);
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writel_relaxed(0x0A, base + UNIPHY_PLL_CAL_CFG0);
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writel_relaxed(0xF3, base + UNIPHY_PLL_CAL_CFG8);
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writel_relaxed(0x01, base + UNIPHY_PLL_CAL_CFG9);
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writel_relaxed(0xED, base + UNIPHY_PLL_CAL_CFG10);
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writel_relaxed(0x02, base + UNIPHY_PLL_CAL_CFG11);
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writel_relaxed(0x36, base + UNIPHY_PLL_SDM_CFG0);
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writel_relaxed(0x0D, base + UNIPHY_PLL_SDM_CFG1);
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writel_relaxed(0xA3, base + UNIPHY_PLL_SDM_CFG2);
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writel_relaxed(0xF0, base + UNIPHY_PLL_SDM_CFG3);
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writel_relaxed(0x00, base + UNIPHY_PLL_SDM_CFG4);
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writel_relaxed(0x19, base + UNIPHY_PLL_SSC_CFG0);
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writel_relaxed(0xE1, base + UNIPHY_PLL_SSC_CFG1);
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writel_relaxed(0x00, base + UNIPHY_PLL_SSC_CFG2);
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writel_relaxed(0x11, base + UNIPHY_PLL_SSC_CFG3);
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writel_relaxed(0x04, base + UNIPHY_PLL_LKDET_CFG0);
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writel_relaxed(0xFF, base + UNIPHY_PLL_LKDET_CFG1);
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writel_relaxed(0x02, base + UNIPHY_PLL_GLB_CFG);
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/* make sure global config LDO power down happens before power up */
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mb();
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writel_relaxed(0x03, base + UNIPHY_PLL_GLB_CFG);
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writel_relaxed(0x05, base + UNIPHY_PLL_LKDET_CFG2);
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/* PLL Lock wait */
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ret = read_poll_timeout(base + UNIPHY_PLL_STATUS, UNIPHY_PLL_LOCK);
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if (ret) {
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dev_err(phy->dev, "poll timeout UNIPHY_PLL_STATUS\n");
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return ret;
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}
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/* TX Calibration */
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ret = read_poll_timeout(base + SATA_PHY_TX_IMCAL_STAT, SATA_PHY_TX_CAL);
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if (ret) {
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dev_err(phy->dev, "poll timeout SATA_PHY_TX_IMCAL_STAT\n");
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return ret;
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}
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/* RX Calibration */
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ret = read_poll_timeout(base + SATA_PHY_RX_IMCAL_STAT, SATA_PHY_RX_CAL);
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if (ret) {
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dev_err(phy->dev, "poll timeout SATA_PHY_RX_IMCAL_STAT\n");
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return ret;
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}
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/* SATA phy calibrated succesfully, power up to functional mode */
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writel_relaxed(0x3E, base + SATA_PHY_POW_DWN_CTRL1);
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writel_relaxed(0x01, base + SATA_PHY_RX_IMCAL0);
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writel_relaxed(0x01, base + SATA_PHY_TX_IMCAL0);
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writel_relaxed(0x00, base + SATA_PHY_POW_DWN_CTRL1);
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writel_relaxed(0x59, base + SATA_PHY_CDR_CTRL0);
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writel_relaxed(0x04, base + SATA_PHY_CDR_CTRL1);
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writel_relaxed(0x00, base + SATA_PHY_CDR_CTRL2);
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writel_relaxed(0x00, base + SATA_PHY_PI_CTRL0);
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writel_relaxed(0x00, base + SATA_PHY_CDR_CTRL3);
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writel_relaxed(0x01, base + SATA_PHY_POW_DWN_CTRL0);
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writel_relaxed(0x11, base + SATA_PHY_TX_DATA_CTRL);
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writel_relaxed(0x43, base + SATA_PHY_ALIGNP);
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writel_relaxed(0x04, base + SATA_PHY_OOB_TERM);
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writel_relaxed(0x01, base + SATA_PHY_EQUAL);
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writel_relaxed(0x09, base + SATA_PHY_TX_DRIV_CTRL0);
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writel_relaxed(0x09, base + SATA_PHY_TX_DRIV_CTRL1);
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return 0;
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}
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static int qcom_apq8064_sata_phy_exit(struct phy *generic_phy)
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{
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struct qcom_apq8064_sata_phy *phy = phy_get_drvdata(generic_phy);
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void __iomem *base = phy->mmio;
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/* Power down PHY */
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writel_relaxed(0xF8, base + SATA_PHY_POW_DWN_CTRL0);
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writel_relaxed(0xFE, base + SATA_PHY_POW_DWN_CTRL1);
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/* Power down PLL block */
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writel_relaxed(0x00, base + UNIPHY_PLL_GLB_CFG);
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return 0;
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}
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static const struct phy_ops qcom_apq8064_sata_phy_ops = {
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.init = qcom_apq8064_sata_phy_init,
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.exit = qcom_apq8064_sata_phy_exit,
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.owner = THIS_MODULE,
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};
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static int qcom_apq8064_sata_phy_probe(struct platform_device *pdev)
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{
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struct qcom_apq8064_sata_phy *phy;
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struct device *dev = &pdev->dev;
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struct resource *res;
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struct phy_provider *phy_provider;
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struct phy *generic_phy;
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int ret;
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phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL);
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if (!phy)
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return -ENOMEM;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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phy->mmio = devm_ioremap_resource(dev, res);
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if (IS_ERR(phy->mmio))
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return PTR_ERR(phy->mmio);
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generic_phy = devm_phy_create(dev, NULL, &qcom_apq8064_sata_phy_ops);
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if (IS_ERR(generic_phy)) {
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dev_err(dev, "%s: failed to create phy\n", __func__);
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return PTR_ERR(generic_phy);
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}
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phy->dev = dev;
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phy_set_drvdata(generic_phy, phy);
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platform_set_drvdata(pdev, phy);
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phy->cfg_clk = devm_clk_get(dev, "cfg");
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if (IS_ERR(phy->cfg_clk)) {
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dev_err(dev, "Failed to get sata cfg clock\n");
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return PTR_ERR(phy->cfg_clk);
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}
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ret = clk_prepare_enable(phy->cfg_clk);
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if (ret)
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return ret;
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phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
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if (IS_ERR(phy_provider)) {
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clk_disable_unprepare(phy->cfg_clk);
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dev_err(dev, "%s: failed to register phy\n", __func__);
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return PTR_ERR(phy_provider);
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}
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return 0;
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}
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static int qcom_apq8064_sata_phy_remove(struct platform_device *pdev)
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{
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struct qcom_apq8064_sata_phy *phy = platform_get_drvdata(pdev);
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clk_disable_unprepare(phy->cfg_clk);
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return 0;
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}
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static const struct of_device_id qcom_apq8064_sata_phy_of_match[] = {
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{ .compatible = "qcom,apq8064-sata-phy" },
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{ },
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};
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MODULE_DEVICE_TABLE(of, qcom_apq8064_sata_phy_of_match);
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static struct platform_driver qcom_apq8064_sata_phy_driver = {
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.probe = qcom_apq8064_sata_phy_probe,
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.remove = qcom_apq8064_sata_phy_remove,
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.driver = {
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.name = "qcom-apq8064-sata-phy",
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.of_match_table = qcom_apq8064_sata_phy_of_match,
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}
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};
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module_platform_driver(qcom_apq8064_sata_phy_driver);
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MODULE_DESCRIPTION("QCOM apq8064 SATA PHY driver");
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MODULE_LICENSE("GPL v2");
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