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-rw-r--r--drivers/phy/mediatek/phy-mtk-xsphy.c540
1 files changed, 540 insertions, 0 deletions
diff --git a/drivers/phy/mediatek/phy-mtk-xsphy.c b/drivers/phy/mediatek/phy-mtk-xsphy.c
new file mode 100644
index 000000000..b222fbbd7
--- /dev/null
+++ b/drivers/phy/mediatek/phy-mtk-xsphy.c
@@ -0,0 +1,540 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * MediaTek USB3.1 gen2 xsphy Driver
+ *
+ * Copyright (c) 2018 MediaTek Inc.
+ * Author: Chunfeng Yun <chunfeng.yun@mediatek.com>
+ *
+ */
+
+#include <dt-bindings/phy/phy.h>
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/iopoll.h>
+#include <linux/module.h>
+#include <linux/of_address.h>
+#include <linux/phy/phy.h>
+#include <linux/platform_device.h>
+
+#include "phy-mtk-io.h"
+
+/* u2 phy banks */
+#define SSUSB_SIFSLV_MISC 0x000
+#define SSUSB_SIFSLV_U2FREQ 0x100
+#define SSUSB_SIFSLV_U2PHY_COM 0x300
+
+/* u3 phy shared banks */
+#define SSPXTP_SIFSLV_DIG_GLB 0x000
+#define SSPXTP_SIFSLV_PHYA_GLB 0x100
+
+/* u3 phy banks */
+#define SSPXTP_SIFSLV_DIG_LN_TOP 0x000
+#define SSPXTP_SIFSLV_DIG_LN_TX0 0x100
+#define SSPXTP_SIFSLV_DIG_LN_RX0 0x200
+#define SSPXTP_SIFSLV_DIG_LN_DAIF 0x300
+#define SSPXTP_SIFSLV_PHYA_LN 0x400
+
+#define XSP_U2FREQ_FMCR0 ((SSUSB_SIFSLV_U2FREQ) + 0x00)
+#define P2F_RG_FREQDET_EN BIT(24)
+#define P2F_RG_CYCLECNT GENMASK(23, 0)
+
+#define XSP_U2FREQ_MMONR0 ((SSUSB_SIFSLV_U2FREQ) + 0x0c)
+
+#define XSP_U2FREQ_FMMONR1 ((SSUSB_SIFSLV_U2FREQ) + 0x10)
+#define P2F_RG_FRCK_EN BIT(8)
+#define P2F_USB_FM_VALID BIT(0)
+
+#define XSP_USBPHYACR0 ((SSUSB_SIFSLV_U2PHY_COM) + 0x00)
+#define P2A0_RG_INTR_EN BIT(5)
+
+#define XSP_USBPHYACR1 ((SSUSB_SIFSLV_U2PHY_COM) + 0x04)
+#define P2A1_RG_INTR_CAL GENMASK(23, 19)
+#define P2A1_RG_VRT_SEL GENMASK(14, 12)
+#define P2A1_RG_TERM_SEL GENMASK(10, 8)
+
+#define XSP_USBPHYACR5 ((SSUSB_SIFSLV_U2PHY_COM) + 0x014)
+#define P2A5_RG_HSTX_SRCAL_EN BIT(15)
+#define P2A5_RG_HSTX_SRCTRL GENMASK(14, 12)
+
+#define XSP_USBPHYACR6 ((SSUSB_SIFSLV_U2PHY_COM) + 0x018)
+#define P2A6_RG_BC11_SW_EN BIT(23)
+#define P2A6_RG_OTG_VBUSCMP_EN BIT(20)
+
+#define XSP_U2PHYDTM1 ((SSUSB_SIFSLV_U2PHY_COM) + 0x06C)
+#define P2D_FORCE_IDDIG BIT(9)
+#define P2D_RG_VBUSVALID BIT(5)
+#define P2D_RG_SESSEND BIT(4)
+#define P2D_RG_AVALID BIT(2)
+#define P2D_RG_IDDIG BIT(1)
+
+#define SSPXTP_PHYA_GLB_00 ((SSPXTP_SIFSLV_PHYA_GLB) + 0x00)
+#define RG_XTP_GLB_BIAS_INTR_CTRL GENMASK(21, 16)
+
+#define SSPXTP_PHYA_LN_04 ((SSPXTP_SIFSLV_PHYA_LN) + 0x04)
+#define RG_XTP_LN0_TX_IMPSEL GENMASK(4, 0)
+
+#define SSPXTP_PHYA_LN_14 ((SSPXTP_SIFSLV_PHYA_LN) + 0x014)
+#define RG_XTP_LN0_RX_IMPSEL GENMASK(4, 0)
+
+#define XSP_REF_CLK 26 /* MHZ */
+#define XSP_SLEW_RATE_COEF 17
+#define XSP_SR_COEF_DIVISOR 1000
+#define XSP_FM_DET_CYCLE_CNT 1024
+
+struct xsphy_instance {
+ struct phy *phy;
+ void __iomem *port_base;
+ struct clk *ref_clk; /* reference clock of anolog phy */
+ u32 index;
+ u32 type;
+ /* only for HQA test */
+ int efuse_intr;
+ int efuse_tx_imp;
+ int efuse_rx_imp;
+ /* u2 eye diagram */
+ int eye_src;
+ int eye_vrt;
+ int eye_term;
+};
+
+struct mtk_xsphy {
+ struct device *dev;
+ void __iomem *glb_base; /* only shared u3 sif */
+ struct xsphy_instance **phys;
+ int nphys;
+ int src_ref_clk; /* MHZ, reference clock for slew rate calibrate */
+ int src_coef; /* coefficient for slew rate calibrate */
+};
+
+static void u2_phy_slew_rate_calibrate(struct mtk_xsphy *xsphy,
+ struct xsphy_instance *inst)
+{
+ void __iomem *pbase = inst->port_base;
+ int calib_val;
+ int fm_out;
+ u32 tmp;
+
+ /* use force value */
+ if (inst->eye_src)
+ return;
+
+ /* enable USB ring oscillator */
+ mtk_phy_set_bits(pbase + XSP_USBPHYACR5, P2A5_RG_HSTX_SRCAL_EN);
+ udelay(1); /* wait clock stable */
+
+ /* enable free run clock */
+ mtk_phy_set_bits(pbase + XSP_U2FREQ_FMMONR1, P2F_RG_FRCK_EN);
+
+ /* set cycle count as 1024 */
+ mtk_phy_update_field(pbase + XSP_U2FREQ_FMCR0, P2F_RG_CYCLECNT,
+ XSP_FM_DET_CYCLE_CNT);
+
+ /* enable frequency meter */
+ mtk_phy_set_bits(pbase + XSP_U2FREQ_FMCR0, P2F_RG_FREQDET_EN);
+
+ /* ignore return value */
+ readl_poll_timeout(pbase + XSP_U2FREQ_FMMONR1, tmp,
+ (tmp & P2F_USB_FM_VALID), 10, 200);
+
+ fm_out = readl(pbase + XSP_U2FREQ_MMONR0);
+
+ /* disable frequency meter */
+ mtk_phy_clear_bits(pbase + XSP_U2FREQ_FMCR0, P2F_RG_FREQDET_EN);
+
+ /* disable free run clock */
+ mtk_phy_clear_bits(pbase + XSP_U2FREQ_FMMONR1, P2F_RG_FRCK_EN);
+
+ if (fm_out) {
+ /* (1024 / FM_OUT) x reference clock frequency x coefficient */
+ tmp = xsphy->src_ref_clk * xsphy->src_coef;
+ tmp = (tmp * XSP_FM_DET_CYCLE_CNT) / fm_out;
+ calib_val = DIV_ROUND_CLOSEST(tmp, XSP_SR_COEF_DIVISOR);
+ } else {
+ /* if FM detection fail, set default value */
+ calib_val = 3;
+ }
+ dev_dbg(xsphy->dev, "phy.%d, fm_out:%d, calib:%d (clk:%d, coef:%d)\n",
+ inst->index, fm_out, calib_val,
+ xsphy->src_ref_clk, xsphy->src_coef);
+
+ /* set HS slew rate */
+ mtk_phy_update_field(pbase + XSP_USBPHYACR5, P2A5_RG_HSTX_SRCTRL, calib_val);
+
+ /* disable USB ring oscillator */
+ mtk_phy_clear_bits(pbase + XSP_USBPHYACR5, P2A5_RG_HSTX_SRCAL_EN);
+}
+
+static void u2_phy_instance_init(struct mtk_xsphy *xsphy,
+ struct xsphy_instance *inst)
+{
+ void __iomem *pbase = inst->port_base;
+
+ /* DP/DM BC1.1 path Disable */
+ mtk_phy_clear_bits(pbase + XSP_USBPHYACR6, P2A6_RG_BC11_SW_EN);
+
+ mtk_phy_set_bits(pbase + XSP_USBPHYACR0, P2A0_RG_INTR_EN);
+}
+
+static void u2_phy_instance_power_on(struct mtk_xsphy *xsphy,
+ struct xsphy_instance *inst)
+{
+ void __iomem *pbase = inst->port_base;
+ u32 index = inst->index;
+
+ mtk_phy_set_bits(pbase + XSP_USBPHYACR6, P2A6_RG_OTG_VBUSCMP_EN);
+
+ mtk_phy_update_bits(pbase + XSP_U2PHYDTM1,
+ P2D_RG_VBUSVALID | P2D_RG_AVALID | P2D_RG_SESSEND,
+ P2D_RG_VBUSVALID | P2D_RG_AVALID);
+
+ dev_dbg(xsphy->dev, "%s(%d)\n", __func__, index);
+}
+
+static void u2_phy_instance_power_off(struct mtk_xsphy *xsphy,
+ struct xsphy_instance *inst)
+{
+ void __iomem *pbase = inst->port_base;
+ u32 index = inst->index;
+
+ mtk_phy_clear_bits(pbase + XSP_USBPHYACR6, P2A6_RG_OTG_VBUSCMP_EN);
+
+ mtk_phy_update_bits(pbase + XSP_U2PHYDTM1,
+ P2D_RG_VBUSVALID | P2D_RG_AVALID | P2D_RG_SESSEND,
+ P2D_RG_SESSEND);
+
+ dev_dbg(xsphy->dev, "%s(%d)\n", __func__, index);
+}
+
+static void u2_phy_instance_set_mode(struct mtk_xsphy *xsphy,
+ struct xsphy_instance *inst,
+ enum phy_mode mode)
+{
+ u32 tmp;
+
+ tmp = readl(inst->port_base + XSP_U2PHYDTM1);
+ switch (mode) {
+ case PHY_MODE_USB_DEVICE:
+ tmp |= P2D_FORCE_IDDIG | P2D_RG_IDDIG;
+ break;
+ case PHY_MODE_USB_HOST:
+ tmp |= P2D_FORCE_IDDIG;
+ tmp &= ~P2D_RG_IDDIG;
+ break;
+ case PHY_MODE_USB_OTG:
+ tmp &= ~(P2D_FORCE_IDDIG | P2D_RG_IDDIG);
+ break;
+ default:
+ return;
+ }
+ writel(tmp, inst->port_base + XSP_U2PHYDTM1);
+}
+
+static void phy_parse_property(struct mtk_xsphy *xsphy,
+ struct xsphy_instance *inst)
+{
+ struct device *dev = &inst->phy->dev;
+
+ switch (inst->type) {
+ case PHY_TYPE_USB2:
+ device_property_read_u32(dev, "mediatek,efuse-intr",
+ &inst->efuse_intr);
+ device_property_read_u32(dev, "mediatek,eye-src",
+ &inst->eye_src);
+ device_property_read_u32(dev, "mediatek,eye-vrt",
+ &inst->eye_vrt);
+ device_property_read_u32(dev, "mediatek,eye-term",
+ &inst->eye_term);
+ dev_dbg(dev, "intr:%d, src:%d, vrt:%d, term:%d\n",
+ inst->efuse_intr, inst->eye_src,
+ inst->eye_vrt, inst->eye_term);
+ break;
+ case PHY_TYPE_USB3:
+ device_property_read_u32(dev, "mediatek,efuse-intr",
+ &inst->efuse_intr);
+ device_property_read_u32(dev, "mediatek,efuse-tx-imp",
+ &inst->efuse_tx_imp);
+ device_property_read_u32(dev, "mediatek,efuse-rx-imp",
+ &inst->efuse_rx_imp);
+ dev_dbg(dev, "intr:%d, tx-imp:%d, rx-imp:%d\n",
+ inst->efuse_intr, inst->efuse_tx_imp,
+ inst->efuse_rx_imp);
+ break;
+ default:
+ dev_err(xsphy->dev, "incompatible phy type\n");
+ return;
+ }
+}
+
+static void u2_phy_props_set(struct mtk_xsphy *xsphy,
+ struct xsphy_instance *inst)
+{
+ void __iomem *pbase = inst->port_base;
+
+ if (inst->efuse_intr)
+ mtk_phy_update_field(pbase + XSP_USBPHYACR1, P2A1_RG_INTR_CAL,
+ inst->efuse_intr);
+
+ if (inst->eye_src)
+ mtk_phy_update_field(pbase + XSP_USBPHYACR5, P2A5_RG_HSTX_SRCTRL,
+ inst->eye_src);
+
+ if (inst->eye_vrt)
+ mtk_phy_update_field(pbase + XSP_USBPHYACR1, P2A1_RG_VRT_SEL,
+ inst->eye_vrt);
+
+ if (inst->eye_term)
+ mtk_phy_update_field(pbase + XSP_USBPHYACR1, P2A1_RG_TERM_SEL,
+ inst->eye_term);
+}
+
+static void u3_phy_props_set(struct mtk_xsphy *xsphy,
+ struct xsphy_instance *inst)
+{
+ void __iomem *pbase = inst->port_base;
+
+ if (inst->efuse_intr)
+ mtk_phy_update_field(xsphy->glb_base + SSPXTP_PHYA_GLB_00,
+ RG_XTP_GLB_BIAS_INTR_CTRL, inst->efuse_intr);
+
+ if (inst->efuse_tx_imp)
+ mtk_phy_update_field(pbase + SSPXTP_PHYA_LN_04,
+ RG_XTP_LN0_TX_IMPSEL, inst->efuse_tx_imp);
+
+ if (inst->efuse_rx_imp)
+ mtk_phy_update_field(pbase + SSPXTP_PHYA_LN_14,
+ RG_XTP_LN0_RX_IMPSEL, inst->efuse_rx_imp);
+}
+
+static int mtk_phy_init(struct phy *phy)
+{
+ struct xsphy_instance *inst = phy_get_drvdata(phy);
+ struct mtk_xsphy *xsphy = dev_get_drvdata(phy->dev.parent);
+ int ret;
+
+ ret = clk_prepare_enable(inst->ref_clk);
+ if (ret) {
+ dev_err(xsphy->dev, "failed to enable ref_clk\n");
+ return ret;
+ }
+
+ switch (inst->type) {
+ case PHY_TYPE_USB2:
+ u2_phy_instance_init(xsphy, inst);
+ u2_phy_props_set(xsphy, inst);
+ break;
+ case PHY_TYPE_USB3:
+ u3_phy_props_set(xsphy, inst);
+ break;
+ default:
+ dev_err(xsphy->dev, "incompatible phy type\n");
+ clk_disable_unprepare(inst->ref_clk);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int mtk_phy_power_on(struct phy *phy)
+{
+ struct xsphy_instance *inst = phy_get_drvdata(phy);
+ struct mtk_xsphy *xsphy = dev_get_drvdata(phy->dev.parent);
+
+ if (inst->type == PHY_TYPE_USB2) {
+ u2_phy_instance_power_on(xsphy, inst);
+ u2_phy_slew_rate_calibrate(xsphy, inst);
+ }
+
+ return 0;
+}
+
+static int mtk_phy_power_off(struct phy *phy)
+{
+ struct xsphy_instance *inst = phy_get_drvdata(phy);
+ struct mtk_xsphy *xsphy = dev_get_drvdata(phy->dev.parent);
+
+ if (inst->type == PHY_TYPE_USB2)
+ u2_phy_instance_power_off(xsphy, inst);
+
+ return 0;
+}
+
+static int mtk_phy_exit(struct phy *phy)
+{
+ struct xsphy_instance *inst = phy_get_drvdata(phy);
+
+ clk_disable_unprepare(inst->ref_clk);
+ return 0;
+}
+
+static int mtk_phy_set_mode(struct phy *phy, enum phy_mode mode, int submode)
+{
+ struct xsphy_instance *inst = phy_get_drvdata(phy);
+ struct mtk_xsphy *xsphy = dev_get_drvdata(phy->dev.parent);
+
+ if (inst->type == PHY_TYPE_USB2)
+ u2_phy_instance_set_mode(xsphy, inst, mode);
+
+ return 0;
+}
+
+static struct phy *mtk_phy_xlate(struct device *dev,
+ struct of_phandle_args *args)
+{
+ struct mtk_xsphy *xsphy = dev_get_drvdata(dev);
+ struct xsphy_instance *inst = NULL;
+ struct device_node *phy_np = args->np;
+ int index;
+
+ if (args->args_count != 1) {
+ dev_err(dev, "invalid number of cells in 'phy' property\n");
+ return ERR_PTR(-EINVAL);
+ }
+
+ for (index = 0; index < xsphy->nphys; index++)
+ if (phy_np == xsphy->phys[index]->phy->dev.of_node) {
+ inst = xsphy->phys[index];
+ break;
+ }
+
+ if (!inst) {
+ dev_err(dev, "failed to find appropriate phy\n");
+ return ERR_PTR(-EINVAL);
+ }
+
+ inst->type = args->args[0];
+ if (!(inst->type == PHY_TYPE_USB2 ||
+ inst->type == PHY_TYPE_USB3)) {
+ dev_err(dev, "unsupported phy type: %d\n", inst->type);
+ return ERR_PTR(-EINVAL);
+ }
+
+ phy_parse_property(xsphy, inst);
+
+ return inst->phy;
+}
+
+static const struct phy_ops mtk_xsphy_ops = {
+ .init = mtk_phy_init,
+ .exit = mtk_phy_exit,
+ .power_on = mtk_phy_power_on,
+ .power_off = mtk_phy_power_off,
+ .set_mode = mtk_phy_set_mode,
+ .owner = THIS_MODULE,
+};
+
+static const struct of_device_id mtk_xsphy_id_table[] = {
+ { .compatible = "mediatek,xsphy", },
+ { },
+};
+MODULE_DEVICE_TABLE(of, mtk_xsphy_id_table);
+
+static int mtk_xsphy_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct device_node *np = dev->of_node;
+ struct device_node *child_np;
+ struct phy_provider *provider;
+ struct resource *glb_res;
+ struct mtk_xsphy *xsphy;
+ struct resource res;
+ int port, retval;
+
+ xsphy = devm_kzalloc(dev, sizeof(*xsphy), GFP_KERNEL);
+ if (!xsphy)
+ return -ENOMEM;
+
+ xsphy->nphys = of_get_child_count(np);
+ xsphy->phys = devm_kcalloc(dev, xsphy->nphys,
+ sizeof(*xsphy->phys), GFP_KERNEL);
+ if (!xsphy->phys)
+ return -ENOMEM;
+
+ xsphy->dev = dev;
+ platform_set_drvdata(pdev, xsphy);
+
+ glb_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ /* optional, may not exist if no u3 phys */
+ if (glb_res) {
+ /* get banks shared by multiple u3 phys */
+ xsphy->glb_base = devm_ioremap_resource(dev, glb_res);
+ if (IS_ERR(xsphy->glb_base)) {
+ dev_err(dev, "failed to remap glb regs\n");
+ return PTR_ERR(xsphy->glb_base);
+ }
+ }
+
+ xsphy->src_ref_clk = XSP_REF_CLK;
+ xsphy->src_coef = XSP_SLEW_RATE_COEF;
+ /* update parameters of slew rate calibrate if exist */
+ device_property_read_u32(dev, "mediatek,src-ref-clk-mhz",
+ &xsphy->src_ref_clk);
+ device_property_read_u32(dev, "mediatek,src-coef", &xsphy->src_coef);
+
+ port = 0;
+ for_each_child_of_node(np, child_np) {
+ struct xsphy_instance *inst;
+ struct phy *phy;
+
+ inst = devm_kzalloc(dev, sizeof(*inst), GFP_KERNEL);
+ if (!inst) {
+ retval = -ENOMEM;
+ goto put_child;
+ }
+
+ xsphy->phys[port] = inst;
+
+ phy = devm_phy_create(dev, child_np, &mtk_xsphy_ops);
+ if (IS_ERR(phy)) {
+ dev_err(dev, "failed to create phy\n");
+ retval = PTR_ERR(phy);
+ goto put_child;
+ }
+
+ retval = of_address_to_resource(child_np, 0, &res);
+ if (retval) {
+ dev_err(dev, "failed to get address resource(id-%d)\n",
+ port);
+ goto put_child;
+ }
+
+ inst->port_base = devm_ioremap_resource(&phy->dev, &res);
+ if (IS_ERR(inst->port_base)) {
+ dev_err(dev, "failed to remap phy regs\n");
+ retval = PTR_ERR(inst->port_base);
+ goto put_child;
+ }
+
+ inst->phy = phy;
+ inst->index = port;
+ phy_set_drvdata(phy, inst);
+ port++;
+
+ inst->ref_clk = devm_clk_get(&phy->dev, "ref");
+ if (IS_ERR(inst->ref_clk)) {
+ dev_err(dev, "failed to get ref_clk(id-%d)\n", port);
+ retval = PTR_ERR(inst->ref_clk);
+ goto put_child;
+ }
+ }
+
+ provider = devm_of_phy_provider_register(dev, mtk_phy_xlate);
+ return PTR_ERR_OR_ZERO(provider);
+
+put_child:
+ of_node_put(child_np);
+ return retval;
+}
+
+static struct platform_driver mtk_xsphy_driver = {
+ .probe = mtk_xsphy_probe,
+ .driver = {
+ .name = "mtk-xsphy",
+ .of_match_table = mtk_xsphy_id_table,
+ },
+};
+
+module_platform_driver(mtk_xsphy_driver);
+
+MODULE_AUTHOR("Chunfeng Yun <chunfeng.yun@mediatek.com>");
+MODULE_DESCRIPTION("MediaTek USB XS-PHY driver");
+MODULE_LICENSE("GPL v2");
generated by cgit v1.2.3 (git 2.39.1) at 2024-10-31 13:08:41 +0000