phy: add support for STM32 usb phy controller
authorPatrice Chotard <patrice.chotard@st.com>
Fri, 27 Apr 2018 09:01:55 +0000 (11:01 +0200)
committerMarek Vasut <marex@denx.de>
Fri, 18 May 2018 11:17:31 +0000 (13:17 +0200)
This patch adds phy tranceiver driver for STM32 USB PHY
Controller (usbphyc) that provides dual port High-Speed
phy for OTG (single port) and EHCI/OHCI host controller
(two ports).
One port of the phy is shared between the two USB controllers
through a UTMI+ switch.

Signed-off-by: Christophe Kerello <christophe.kerello@st.com>
Signed-off-by: Amelie Delaunay <amelie.delaunay@st.com>
Signed-off-by: Patrice Chotard <patrice.chotard@st.com>
Documentation/devicetree/bindings/phy/phy-stm32-usbphyc.txt [new file with mode: 0644]
drivers/phy/Kconfig
drivers/phy/Makefile
drivers/phy/phy-stm32-usbphyc.c [new file with mode: 0644]

diff --git a/Documentation/devicetree/bindings/phy/phy-stm32-usbphyc.txt b/Documentation/devicetree/bindings/phy/phy-stm32-usbphyc.txt
new file mode 100644 (file)
index 0000000..725ae71
--- /dev/null
@@ -0,0 +1,73 @@
+STMicroelectronics STM32 USB HS PHY controller
+
+The STM32 USBPHYC block contains a dual port High Speed UTMI+ PHY and a UTMI
+switch. It controls PHY configuration and status, and the UTMI+ switch that
+selects either OTG or HOST controller for the second PHY port. It also sets
+PLL configuration.
+
+USBPHYC
+      |_ PLL
+      |
+      |_ PHY port#1 _________________ HOST controller
+      |                    _                 |
+      |                  / 1|________________|
+      |_ PHY port#2 ----|   |________________
+      |                  \_0|                |
+      |_ UTMI switch_______|          OTG controller
+
+
+Phy provider node
+=================
+
+Required properties:
+- compatible: must be "st,stm32mp1-usbphyc"
+- reg: address and length of the usb phy control register set
+- clocks: phandle + clock specifier for the PLL phy clock
+- #address-cells: number of address cells for phys sub-nodes, must be <1>
+- #size-cells: number of size cells for phys sub-nodes, must be <0>
+
+Optional properties:
+- assigned-clocks: phandle + clock specifier for the PLL phy clock
+- assigned-clock-parents: the PLL phy clock parent
+- resets: phandle + reset specifier
+
+Required nodes: one sub-node per port the controller provides.
+
+Phy sub-nodes
+==============
+
+Required properties:
+- reg: phy port index
+- phy-supply: phandle to the regulator providing 3V3 power to the PHY,
+             see phy-bindings.txt in the same directory.
+- vdda1v1-supply: phandle to the regulator providing 1V1 power to the PHY
+- vdda1v8-supply: phandle to the regulator providing 1V8 power to the PHY
+- #phy-cells: see phy-bindings.txt in the same directory, must be <0> for PHY
+  port#1 and must be <1> for PHY port#2, to select USB controller
+
+
+Example:
+               usbphyc: usb-phy@5a006000 {
+                       compatible = "st,stm32mp1-usbphyc";
+                       reg = <0x5a006000 0x1000>;
+                       clocks = <&rcc_clk USBPHY_K>;
+                       resets = <&rcc_rst USBPHY_R>;
+                       #address-cells = <1>;
+                       #size-cells = <0>;
+
+                       usbphyc_port0: usb-phy@0 {
+                               reg = <0>;
+                               phy-supply = <&vdd_usb>;
+                               vdda1v1-supply = <&reg11>;
+                               vdda1v8-supply = <&reg18>
+                               #phy-cells = <0>;
+                       };
+
+                       usbphyc_port1: usb-phy@1 {
+                               reg = <1>;
+                               phy-supply = <&vdd_usb>;
+                               vdda1v1-supply = <&reg11>;
+                               vdda1v8-supply = <&reg18>
+                               #phy-cells = <1>;
+                       };
+               };
index 119edec204829051386dcb0f14ae8634fb933c02..8fc2295d03a5f5b86eda3664dda98e894f7160f7 100644 (file)
@@ -110,6 +110,19 @@ config STI_USB_PHY
          used by USB2 and USB3 Host controllers available on
          STiH407 SoC families.
 
+config PHY_STM32_USBPHYC
+       tristate "STMicroelectronics STM32 SoC USB HS PHY driver"
+       depends on PHY && ARCH_STM32MP
+       help
+         Enable this to support the High-Speed USB transceiver that is part of
+         STMicroelectronics STM32 SoCs.
+
+         This driver controls the entire USB PHY block: the USB PHY controller
+         (USBPHYC) and the two 8-bit wide UTMI+ interface. First interface is
+         used by an HS USB Host controller, and the second one is shared
+         between an HS USB OTG controller and an HS USB Host controller,
+         selected by an USB switch.
+
 config MESON_GXL_USB_PHY
        bool "Amlogic Meson GXL USB PHYs"
        depends on PHY && ARCH_MESON && MESON_GXL
index 5c8711d6a4f50ebbe7c6dd8d47356e1dfbff1b30..ba0803cd04095567357ad752c52e816633ea3af0 100644 (file)
@@ -12,4 +12,5 @@ obj-$(CONFIG_BCM6368_USBH_PHY) += bcm6368-usbh-phy.o
 obj-$(CONFIG_PHY_SANDBOX) += sandbox-phy.o
 obj-$(CONFIG_$(SPL_)PIPE3_PHY) += ti-pipe3-phy.o
 obj-$(CONFIG_STI_USB_PHY) += sti_usb_phy.o
+obj-$(CONFIG_PHY_STM32_USBPHYC) += phy-stm32-usbphyc.o
 obj-$(CONFIG_MESON_GXL_USB_PHY) += meson-gxl-usb2.o meson-gxl-usb3.o
diff --git a/drivers/phy/phy-stm32-usbphyc.c b/drivers/phy/phy-stm32-usbphyc.c
new file mode 100644 (file)
index 0000000..4ff6a9a
--- /dev/null
@@ -0,0 +1,402 @@
+// SPDX-License-Identifier:    GPL-2.0+        BSD-3-Clause
+/*
+ * Copyright (C) 2018, STMicroelectronics - All Rights Reserved
+ */
+
+#include <common.h>
+#include <clk.h>
+#include <div64.h>
+#include <dm.h>
+#include <fdtdec.h>
+#include <generic-phy.h>
+#include <reset.h>
+#include <syscon.h>
+#include <usb.h>
+#include <asm/io.h>
+#include <linux/bitops.h>
+#include <power/regulator.h>
+
+/* USBPHYC registers */
+#define STM32_USBPHYC_PLL      0x0
+#define STM32_USBPHYC_MISC     0x8
+
+/* STM32_USBPHYC_PLL bit fields */
+#define PLLNDIV                        GENMASK(6, 0)
+#define PLLNDIV_SHIFT          0
+#define PLLFRACIN              GENMASK(25, 10)
+#define PLLFRACIN_SHIFT                10
+#define PLLEN                  BIT(26)
+#define PLLSTRB                        BIT(27)
+#define PLLSTRBYP              BIT(28)
+#define PLLFRACCTL             BIT(29)
+#define PLLDITHEN0             BIT(30)
+#define PLLDITHEN1             BIT(31)
+
+/* STM32_USBPHYC_MISC bit fields */
+#define SWITHOST               BIT(0)
+
+#define MAX_PHYS               2
+
+#define PLL_LOCK_TIME_US       100
+#define PLL_PWR_DOWN_TIME_US   5
+#define PLL_FVCO               2880     /* in MHz */
+#define PLL_INFF_MIN_RATE      19200000 /* in Hz */
+#define PLL_INFF_MAX_RATE      38400000 /* in Hz */
+
+struct pll_params {
+       u8 ndiv;
+       u16 frac;
+};
+
+struct stm32_usbphyc {
+       fdt_addr_t base;
+       struct clk clk;
+       struct stm32_usbphyc_phy {
+               struct udevice *vdd;
+               struct udevice *vdda1v1;
+               struct udevice *vdda1v8;
+               int index;
+               bool init;
+               bool powered;
+       } phys[MAX_PHYS];
+};
+
+void stm32_usbphyc_get_pll_params(u32 clk_rate, struct pll_params *pll_params)
+{
+       unsigned long long fvco, ndiv, frac;
+
+       /*
+        *    | FVCO = INFF*2*(NDIV + FRACT/2^16 ) when DITHER_DISABLE[1] = 1
+        *    | FVCO = 2880MHz
+        *    | NDIV = integer part of input bits to set the LDF
+        *    | FRACT = fractional part of input bits to set the LDF
+        *  =>  PLLNDIV = integer part of (FVCO / (INFF*2))
+        *  =>  PLLFRACIN = fractional part of(FVCO / INFF*2) * 2^16
+        * <=>  PLLFRACIN = ((FVCO / (INFF*2)) - PLLNDIV) * 2^16
+        */
+       fvco = (unsigned long long)PLL_FVCO * 1000000; /* In Hz */
+
+       ndiv = fvco;
+       do_div(ndiv, (clk_rate * 2));
+       pll_params->ndiv = (u8)ndiv;
+
+       frac = fvco * (1 << 16);
+       do_div(frac, (clk_rate * 2));
+       frac = frac - (ndiv * (1 << 16));
+       pll_params->frac = (u16)frac;
+}
+
+static int stm32_usbphyc_pll_init(struct stm32_usbphyc *usbphyc)
+{
+       struct pll_params pll_params;
+       u32 clk_rate = clk_get_rate(&usbphyc->clk);
+       u32 usbphyc_pll;
+
+       if ((clk_rate < PLL_INFF_MIN_RATE) || (clk_rate > PLL_INFF_MAX_RATE)) {
+               pr_debug("%s: input clk freq (%dHz) out of range\n",
+                        __func__, clk_rate);
+               return -EINVAL;
+       }
+
+       stm32_usbphyc_get_pll_params(clk_rate, &pll_params);
+
+       usbphyc_pll = PLLDITHEN1 | PLLDITHEN0 | PLLSTRBYP;
+       usbphyc_pll |= ((pll_params.ndiv << PLLNDIV_SHIFT) & PLLNDIV);
+
+       if (pll_params.frac) {
+               usbphyc_pll |= PLLFRACCTL;
+               usbphyc_pll |= ((pll_params.frac << PLLFRACIN_SHIFT)
+                                & PLLFRACIN);
+       }
+
+       writel(usbphyc_pll, usbphyc->base + STM32_USBPHYC_PLL);
+
+       pr_debug("%s: input clk freq=%dHz, ndiv=%d, frac=%d\n", __func__,
+                clk_rate, pll_params.ndiv, pll_params.frac);
+
+       return 0;
+}
+
+static bool stm32_usbphyc_is_init(struct stm32_usbphyc *usbphyc)
+{
+       int i;
+
+       for (i = 0; i < MAX_PHYS; i++) {
+               if (usbphyc->phys[i].init)
+                       return true;
+       }
+
+       return false;
+}
+
+static bool stm32_usbphyc_is_powered(struct stm32_usbphyc *usbphyc)
+{
+       int i;
+
+       for (i = 0; i < MAX_PHYS; i++) {
+               if (usbphyc->phys[i].powered)
+                       return true;
+       }
+
+       return false;
+}
+
+static int stm32_usbphyc_phy_init(struct phy *phy)
+{
+       struct stm32_usbphyc *usbphyc = dev_get_priv(phy->dev);
+       struct stm32_usbphyc_phy *usbphyc_phy = usbphyc->phys + phy->id;
+       bool pllen = readl(usbphyc->base + STM32_USBPHYC_PLL) & PLLEN ?
+                    true : false;
+       int ret;
+
+       pr_debug("%s phy ID = %lu\n", __func__, phy->id);
+       /* Check if one phy port has already configured the pll */
+       if (pllen && stm32_usbphyc_is_init(usbphyc))
+               goto initialized;
+
+       if (pllen) {
+               clrbits_le32(usbphyc->base + STM32_USBPHYC_PLL, PLLEN);
+               udelay(PLL_PWR_DOWN_TIME_US);
+       }
+
+       ret = stm32_usbphyc_pll_init(usbphyc);
+       if (ret)
+               return ret;
+
+       setbits_le32(usbphyc->base + STM32_USBPHYC_PLL, PLLEN);
+
+       /*
+        * We must wait PLL_LOCK_TIME_US before checking that PLLEN
+        * bit is still set
+        */
+       udelay(PLL_LOCK_TIME_US);
+
+       if (!(readl(usbphyc->base + STM32_USBPHYC_PLL) & PLLEN))
+               return -EIO;
+
+initialized:
+       usbphyc_phy->init = true;
+
+       return 0;
+}
+
+static int stm32_usbphyc_phy_exit(struct phy *phy)
+{
+       struct stm32_usbphyc *usbphyc = dev_get_priv(phy->dev);
+       struct stm32_usbphyc_phy *usbphyc_phy = usbphyc->phys + phy->id;
+
+       pr_debug("%s phy ID = %lu\n", __func__, phy->id);
+       usbphyc_phy->init = false;
+
+       /* Check if other phy port requires pllen */
+       if (stm32_usbphyc_is_init(usbphyc))
+               return 0;
+
+       clrbits_le32(usbphyc->base + STM32_USBPHYC_PLL, PLLEN);
+
+       /*
+        * We must wait PLL_PWR_DOWN_TIME_US before checking that PLLEN
+        * bit is still clear
+        */
+       udelay(PLL_PWR_DOWN_TIME_US);
+
+       if (readl(usbphyc->base + STM32_USBPHYC_PLL) & PLLEN)
+               return -EIO;
+
+       return 0;
+}
+
+static int stm32_usbphyc_phy_power_on(struct phy *phy)
+{
+       struct stm32_usbphyc *usbphyc = dev_get_priv(phy->dev);
+       struct stm32_usbphyc_phy *usbphyc_phy = usbphyc->phys + phy->id;
+       int ret;
+
+       pr_debug("%s phy ID = %lu\n", __func__, phy->id);
+       if (usbphyc_phy->vdda1v1) {
+               ret = regulator_set_enable(usbphyc_phy->vdda1v1, true);
+               if (ret)
+                       return ret;
+       }
+
+       if (usbphyc_phy->vdda1v8) {
+               ret = regulator_set_enable(usbphyc_phy->vdda1v8, true);
+               if (ret)
+                       return ret;
+       }
+       if (usbphyc_phy->vdd) {
+               ret = regulator_set_enable(usbphyc_phy->vdd, true);
+               if (ret)
+                       return ret;
+       }
+
+       usbphyc_phy->powered = true;
+
+       return 0;
+}
+
+static int stm32_usbphyc_phy_power_off(struct phy *phy)
+{
+       struct stm32_usbphyc *usbphyc = dev_get_priv(phy->dev);
+       struct stm32_usbphyc_phy *usbphyc_phy = usbphyc->phys + phy->id;
+       int ret;
+
+       pr_debug("%s phy ID = %lu\n", __func__, phy->id);
+       usbphyc_phy->powered = false;
+
+       if (stm32_usbphyc_is_powered(usbphyc))
+               return 0;
+
+       if (usbphyc_phy->vdda1v1) {
+               ret = regulator_set_enable(usbphyc_phy->vdda1v1, false);
+               if (ret)
+                       return ret;
+       }
+
+       if (usbphyc_phy->vdda1v8) {
+               ret = regulator_set_enable(usbphyc_phy->vdda1v8, false);
+               if (ret)
+                       return ret;
+       }
+
+       if (usbphyc_phy->vdd) {
+               ret = regulator_set_enable(usbphyc_phy->vdd, false);
+               if (ret)
+                       return ret;
+       }
+
+       return 0;
+}
+
+static int stm32_usbphyc_get_regulator(struct udevice *dev, ofnode node,
+                                      char *supply_name,
+                                      struct udevice **regulator)
+{
+       struct ofnode_phandle_args regulator_phandle;
+       int ret;
+
+       ret = ofnode_parse_phandle_with_args(node, supply_name,
+                                            NULL, 0, 0,
+                                            &regulator_phandle);
+       if (ret) {
+               dev_err(dev, "Can't find %s property (%d)\n", supply_name, ret);
+               return ret;
+       }
+
+       ret = uclass_get_device_by_ofnode(UCLASS_REGULATOR,
+                                         regulator_phandle.node,
+                                         regulator);
+
+       if (ret) {
+               dev_err(dev, "Can't get %s regulator (%d)\n", supply_name, ret);
+               return ret;
+       }
+
+       return 0;
+}
+
+static int stm32_usbphyc_of_xlate(struct phy *phy,
+                                 struct ofnode_phandle_args *args)
+{
+       if (args->args_count > 1) {
+               pr_debug("%s: invalid args_count: %d\n", __func__,
+                        args->args_count);
+               return -EINVAL;
+       }
+
+       if (args->args[0] >= MAX_PHYS)
+               return -ENODEV;
+
+       if (args->args_count)
+               phy->id = args->args[0];
+       else
+               phy->id = 0;
+
+       return 0;
+}
+
+static const struct phy_ops stm32_usbphyc_phy_ops = {
+       .init = stm32_usbphyc_phy_init,
+       .exit = stm32_usbphyc_phy_exit,
+       .power_on = stm32_usbphyc_phy_power_on,
+       .power_off = stm32_usbphyc_phy_power_off,
+       .of_xlate = stm32_usbphyc_of_xlate,
+};
+
+static int stm32_usbphyc_probe(struct udevice *dev)
+{
+       struct stm32_usbphyc *usbphyc = dev_get_priv(dev);
+       struct reset_ctl reset;
+       ofnode node;
+       int i, ret;
+
+       usbphyc->base = dev_read_addr(dev);
+       if (usbphyc->base == FDT_ADDR_T_NONE)
+               return -EINVAL;
+
+       /* Enable clock */
+       ret = clk_get_by_index(dev, 0, &usbphyc->clk);
+       if (ret)
+               return ret;
+
+       ret = clk_enable(&usbphyc->clk);
+       if (ret)
+               return ret;
+
+       /* Reset */
+       ret = reset_get_by_index(dev, 0, &reset);
+       if (!ret) {
+               reset_assert(&reset);
+               udelay(2);
+               reset_deassert(&reset);
+       }
+
+       /*
+        * parse all PHY subnodes in order to populate regulator associated
+        * to each PHY port
+        */
+       node = dev_read_first_subnode(dev);
+       for (i = 0; i < MAX_PHYS; i++) {
+               struct stm32_usbphyc_phy *usbphyc_phy = usbphyc->phys + i;
+
+               usbphyc_phy->index = i;
+               usbphyc_phy->init = false;
+               usbphyc_phy->powered = false;
+               ret = stm32_usbphyc_get_regulator(dev, node, "phy-supply",
+                                                 &usbphyc_phy->vdd);
+               if (ret)
+                       return ret;
+
+               ret = stm32_usbphyc_get_regulator(dev, node, "vdda1v1-supply",
+                                                 &usbphyc_phy->vdda1v1);
+               if (ret)
+                       return ret;
+
+               ret = stm32_usbphyc_get_regulator(dev, node, "vdda1v8-supply",
+                                                 &usbphyc_phy->vdda1v8);
+               if (ret)
+                       return ret;
+
+               node = dev_read_next_subnode(node);
+       }
+
+       /* Check if second port has to be used for host controller */
+       if (dev_read_bool(dev, "st,port2-switch-to-host"))
+               setbits_le32(usbphyc->base + STM32_USBPHYC_MISC, SWITHOST);
+
+       return 0;
+}
+
+static const struct udevice_id stm32_usbphyc_of_match[] = {
+       { .compatible = "st,stm32mp1-usbphyc", },
+       { },
+};
+
+U_BOOT_DRIVER(stm32_usb_phyc) = {
+       .name = "stm32-usbphyc",
+       .id = UCLASS_PHY,
+       .of_match = stm32_usbphyc_of_match,
+       .ops = &stm32_usbphyc_phy_ops,
+       .probe = stm32_usbphyc_probe,
+       .priv_auto_alloc_size = sizeof(struct stm32_usbphyc),
+};