[U-Boot] [PATCH v1] phy: add support for STM32 usb phy controller
Patrice Chotard
patrice.chotard at st.com
Thu Mar 29 07:12:29 UTC 2018
From: Christophe Kerello <christophe.kerello at st.com>
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 at st.com>
Signed-off-by: Patrice Chotard <patrice.chotard at st.com>
---
drivers/phy/Kconfig | 13 ++
drivers/phy/Makefile | 1 +
drivers/phy/phy-stm32-usbphyc.c | 403 ++++++++++++++++++++++++++++++++++++++++
3 files changed, 417 insertions(+)
create mode 100644 drivers/phy/phy-stm32-usbphyc.c
diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
index 4e9d09910c32..1de3f31bcdd1 100644
--- a/drivers/phy/Kconfig
+++ b/drivers/phy/Kconfig
@@ -110,4 +110,17 @@ 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.
+
endmenu
diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile
index 68087ae3b134..e93c3257230d 100644
--- a/drivers/phy/Makefile
+++ b/drivers/phy/Makefile
@@ -14,3 +14,4 @@ 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
diff --git a/drivers/phy/phy-stm32-usbphyc.c b/drivers/phy/phy-stm32-usbphyc.c
new file mode 100644
index 000000000000..155a3ec26dfc
--- /dev/null
+++ b/drivers/phy/phy-stm32-usbphyc.c
@@ -0,0 +1,403 @@
+/*
+ * Copyright (C) 2018, STMicroelectronics - All Rights Reserved
+ *
+ * SPDX-License-Identifier: GPL-2.0+ BSD-3-Clause
+ */
+
+#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,
+ ®ulator_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),
+};
--
1.9.1
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