339 lines
7.2 KiB
C
339 lines
7.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2016-2018 Broadcom
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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/iopoll.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/phy/phy.h>
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#include <linux/platform_device.h>
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enum bcm_usb_phy_version {
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BCM_SR_USB_COMBO_PHY,
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BCM_SR_USB_HS_PHY,
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};
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enum bcm_usb_phy_reg {
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PLL_CTRL,
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PHY_CTRL,
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PHY_PLL_CTRL,
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};
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/* USB PHY registers */
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static const u8 bcm_usb_combo_phy_ss[] = {
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[PLL_CTRL] = 0x18,
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[PHY_CTRL] = 0x14,
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};
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static const u8 bcm_usb_combo_phy_hs[] = {
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[PLL_CTRL] = 0x0c,
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[PHY_CTRL] = 0x10,
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};
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static const u8 bcm_usb_hs_phy[] = {
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[PLL_CTRL] = 0x8,
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[PHY_CTRL] = 0xc,
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};
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enum pll_ctrl_bits {
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PLL_RESETB,
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SSPLL_SUSPEND_EN,
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PLL_SEQ_START,
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PLL_LOCK,
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};
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static const u8 u3pll_ctrl[] = {
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[PLL_RESETB] = 0,
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[SSPLL_SUSPEND_EN] = 1,
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[PLL_SEQ_START] = 2,
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[PLL_LOCK] = 3,
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};
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#define HSPLL_PDIV_MASK 0xF
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#define HSPLL_PDIV_VAL 0x1
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static const u8 u2pll_ctrl[] = {
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[PLL_RESETB] = 5,
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[PLL_LOCK] = 6,
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};
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enum bcm_usb_phy_ctrl_bits {
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CORERDY,
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PHY_RESETB,
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PHY_PCTL,
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};
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#define PHY_PCTL_MASK 0xffff
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#define SSPHY_PCTL_VAL 0x0006
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static const u8 u3phy_ctrl[] = {
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[PHY_RESETB] = 1,
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[PHY_PCTL] = 2,
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};
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static const u8 u2phy_ctrl[] = {
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[CORERDY] = 0,
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[PHY_RESETB] = 5,
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[PHY_PCTL] = 6,
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};
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struct bcm_usb_phy_cfg {
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uint32_t type;
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uint32_t version;
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void __iomem *regs;
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struct phy *phy;
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const u8 *offset;
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};
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#define PLL_LOCK_RETRY_COUNT 1000
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enum bcm_usb_phy_type {
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USB_HS_PHY,
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USB_SS_PHY,
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};
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#define NUM_BCM_SR_USB_COMBO_PHYS 2
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static inline void bcm_usb_reg32_clrbits(void __iomem *addr, uint32_t clear)
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{
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writel(readl(addr) & ~clear, addr);
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}
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static inline void bcm_usb_reg32_setbits(void __iomem *addr, uint32_t set)
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{
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writel(readl(addr) | set, addr);
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}
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static int bcm_usb_pll_lock_check(void __iomem *addr, u32 bit)
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{
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u32 data;
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int ret;
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ret = readl_poll_timeout_atomic(addr, data, (data & bit), 1,
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PLL_LOCK_RETRY_COUNT);
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if (ret)
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pr_err("%s: FAIL\n", __func__);
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return ret;
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}
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static int bcm_usb_ss_phy_init(struct bcm_usb_phy_cfg *phy_cfg)
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{
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int ret = 0;
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void __iomem *regs = phy_cfg->regs;
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const u8 *offset;
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u32 rd_data;
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offset = phy_cfg->offset;
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/* Set pctl with mode and soft reset */
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rd_data = readl(regs + offset[PHY_CTRL]);
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rd_data &= ~(PHY_PCTL_MASK << u3phy_ctrl[PHY_PCTL]);
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rd_data |= (SSPHY_PCTL_VAL << u3phy_ctrl[PHY_PCTL]);
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writel(rd_data, regs + offset[PHY_CTRL]);
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bcm_usb_reg32_clrbits(regs + offset[PLL_CTRL],
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BIT(u3pll_ctrl[SSPLL_SUSPEND_EN]));
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bcm_usb_reg32_setbits(regs + offset[PLL_CTRL],
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BIT(u3pll_ctrl[PLL_SEQ_START]));
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bcm_usb_reg32_setbits(regs + offset[PLL_CTRL],
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BIT(u3pll_ctrl[PLL_RESETB]));
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/* Maximum timeout for PLL reset done */
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msleep(30);
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ret = bcm_usb_pll_lock_check(regs + offset[PLL_CTRL],
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BIT(u3pll_ctrl[PLL_LOCK]));
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return ret;
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}
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static int bcm_usb_hs_phy_init(struct bcm_usb_phy_cfg *phy_cfg)
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{
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int ret = 0;
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void __iomem *regs = phy_cfg->regs;
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const u8 *offset;
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offset = phy_cfg->offset;
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bcm_usb_reg32_clrbits(regs + offset[PLL_CTRL],
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BIT(u2pll_ctrl[PLL_RESETB]));
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bcm_usb_reg32_setbits(regs + offset[PLL_CTRL],
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BIT(u2pll_ctrl[PLL_RESETB]));
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ret = bcm_usb_pll_lock_check(regs + offset[PLL_CTRL],
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BIT(u2pll_ctrl[PLL_LOCK]));
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return ret;
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}
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static int bcm_usb_phy_reset(struct phy *phy)
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{
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struct bcm_usb_phy_cfg *phy_cfg = phy_get_drvdata(phy);
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void __iomem *regs = phy_cfg->regs;
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const u8 *offset;
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offset = phy_cfg->offset;
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if (phy_cfg->type == USB_HS_PHY) {
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bcm_usb_reg32_clrbits(regs + offset[PHY_CTRL],
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BIT(u2phy_ctrl[CORERDY]));
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bcm_usb_reg32_setbits(regs + offset[PHY_CTRL],
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BIT(u2phy_ctrl[CORERDY]));
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}
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return 0;
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}
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static int bcm_usb_phy_init(struct phy *phy)
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{
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struct bcm_usb_phy_cfg *phy_cfg = phy_get_drvdata(phy);
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int ret = -EINVAL;
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if (phy_cfg->type == USB_SS_PHY)
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ret = bcm_usb_ss_phy_init(phy_cfg);
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else if (phy_cfg->type == USB_HS_PHY)
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ret = bcm_usb_hs_phy_init(phy_cfg);
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return ret;
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}
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static const struct phy_ops sr_phy_ops = {
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.init = bcm_usb_phy_init,
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.reset = bcm_usb_phy_reset,
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.owner = THIS_MODULE,
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};
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static struct phy *bcm_usb_phy_xlate(struct device *dev,
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struct of_phandle_args *args)
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{
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struct bcm_usb_phy_cfg *phy_cfg;
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int phy_idx;
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phy_cfg = dev_get_drvdata(dev);
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if (!phy_cfg)
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return ERR_PTR(-EINVAL);
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if (phy_cfg->version == BCM_SR_USB_COMBO_PHY) {
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phy_idx = args->args[0];
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if (WARN_ON(phy_idx > 1))
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return ERR_PTR(-ENODEV);
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return phy_cfg[phy_idx].phy;
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} else
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return phy_cfg->phy;
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}
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static int bcm_usb_phy_create(struct device *dev, struct device_node *node,
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void __iomem *regs, uint32_t version)
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{
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struct bcm_usb_phy_cfg *phy_cfg;
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int idx;
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if (version == BCM_SR_USB_COMBO_PHY) {
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phy_cfg = devm_kzalloc(dev, NUM_BCM_SR_USB_COMBO_PHYS *
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sizeof(struct bcm_usb_phy_cfg),
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GFP_KERNEL);
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if (!phy_cfg)
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return -ENOMEM;
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for (idx = 0; idx < NUM_BCM_SR_USB_COMBO_PHYS; idx++) {
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phy_cfg[idx].regs = regs;
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phy_cfg[idx].version = version;
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if (idx == 0) {
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phy_cfg[idx].offset = bcm_usb_combo_phy_hs;
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phy_cfg[idx].type = USB_HS_PHY;
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} else {
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phy_cfg[idx].offset = bcm_usb_combo_phy_ss;
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phy_cfg[idx].type = USB_SS_PHY;
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}
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phy_cfg[idx].phy = devm_phy_create(dev, node,
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&sr_phy_ops);
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if (IS_ERR(phy_cfg[idx].phy))
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return PTR_ERR(phy_cfg[idx].phy);
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phy_set_drvdata(phy_cfg[idx].phy, &phy_cfg[idx]);
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}
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} else if (version == BCM_SR_USB_HS_PHY) {
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phy_cfg = devm_kzalloc(dev, sizeof(struct bcm_usb_phy_cfg),
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GFP_KERNEL);
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if (!phy_cfg)
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return -ENOMEM;
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phy_cfg->regs = regs;
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phy_cfg->version = version;
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phy_cfg->offset = bcm_usb_hs_phy;
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phy_cfg->type = USB_HS_PHY;
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phy_cfg->phy = devm_phy_create(dev, node, &sr_phy_ops);
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if (IS_ERR(phy_cfg->phy))
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return PTR_ERR(phy_cfg->phy);
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phy_set_drvdata(phy_cfg->phy, phy_cfg);
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} else
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return -ENODEV;
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dev_set_drvdata(dev, phy_cfg);
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return 0;
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}
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static const struct of_device_id bcm_usb_phy_of_match[] = {
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{
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.compatible = "brcm,sr-usb-combo-phy",
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.data = (void *)BCM_SR_USB_COMBO_PHY,
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},
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{
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.compatible = "brcm,sr-usb-hs-phy",
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.data = (void *)BCM_SR_USB_HS_PHY,
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},
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{ /* sentinel */ },
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};
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MODULE_DEVICE_TABLE(of, bcm_usb_phy_of_match);
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static int bcm_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 device_node *dn = dev->of_node;
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const struct of_device_id *of_id;
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void __iomem *regs;
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int ret;
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enum bcm_usb_phy_version version;
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struct phy_provider *phy_provider;
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regs = devm_platform_ioremap_resource(pdev, 0);
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if (IS_ERR(regs))
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return PTR_ERR(regs);
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of_id = of_match_node(bcm_usb_phy_of_match, dn);
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if (of_id)
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version = (enum bcm_usb_phy_version)of_id->data;
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else
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return -ENODEV;
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ret = bcm_usb_phy_create(dev, dn, regs, version);
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if (ret)
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return ret;
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phy_provider = devm_of_phy_provider_register(dev, bcm_usb_phy_xlate);
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return PTR_ERR_OR_ZERO(phy_provider);
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}
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static struct platform_driver bcm_usb_phy_driver = {
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.driver = {
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.name = "phy-bcm-sr-usb",
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.of_match_table = bcm_usb_phy_of_match,
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},
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.probe = bcm_usb_phy_probe,
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};
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module_platform_driver(bcm_usb_phy_driver);
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MODULE_AUTHOR("Broadcom");
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MODULE_DESCRIPTION("Broadcom stingray USB Phy driver");
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MODULE_LICENSE("GPL v2");
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