From: Patrice Chotard patrice.chotard@st.com
This is the generic phy driver for the picoPHY ports used by USB2/1.1 controllers. It is found on STiH407 SoC family from STMicroelectronics.
Signed-off-by: Patrice Chotard patrice.chotard@st.com ---
v3: _ convert driver to USB PHY uclass
v2: _ replace bitfield_replace() by clrsetbits_le32()
doc/device-tree-bindings/phy/phy-stih407-usb.txt | 24 +++ drivers/usb/phy/Kconfig | 9 ++ drivers/usb/phy/Makefile | 1 + drivers/usb/phy/sti_usb_phy.c | 181 +++++++++++++++++++++++ 4 files changed, 215 insertions(+) create mode 100644 doc/device-tree-bindings/phy/phy-stih407-usb.txt create mode 100644 drivers/usb/phy/sti_usb_phy.c
diff --git a/doc/device-tree-bindings/phy/phy-stih407-usb.txt b/doc/device-tree-bindings/phy/phy-stih407-usb.txt new file mode 100644 index 0000000..de6a706 --- /dev/null +++ b/doc/device-tree-bindings/phy/phy-stih407-usb.txt @@ -0,0 +1,24 @@ +ST STiH407 USB PHY controller + +This file documents the dt bindings for the usb picoPHY driver which is the PHY for both USB2 and USB3 +host controllers (when controlling usb2/1.1 devices) available on STiH407 SoC family from STMicroelectronics. + +Required properties: +- compatible : should be "st,stih407-usb2-phy" +- st,syscfg : phandle of sysconfig bank plus integer array containing phyparam and phyctrl register offsets +- resets : list of phandle and reset specifier pairs. There should be two entries, one + for the whole phy and one for the port +- reset-names : list of reset signal names. Should be "global" and "port" +See: Documentation/devicetree/bindings/reset/st,sti-powerdown.txt +See: Documentation/devicetree/bindings/reset/reset.txt + +Example: + +usb2_picophy0: usbpicophy@f8 { + compatible = "st,stih407-usb2-phy"; + #phy-cells = <0>; + st,syscfg = <&syscfg_core 0x100 0xf4>; + resets = <&softreset STIH407_PICOPHY_SOFTRESET>, + <&picophyreset STIH407_PICOPHY0_RESET>; + reset-names = "global", "port"; +}; diff --git a/drivers/usb/phy/Kconfig b/drivers/usb/phy/Kconfig index 0539401..98c1995 100644 --- a/drivers/usb/phy/Kconfig +++ b/drivers/usb/phy/Kconfig @@ -7,4 +7,13 @@ config USB_PHY Enable driver model for USB PHY access. It defines basic init and exit API.
+config STI_USB_PHY + bool "STMicroelectronics USB2 picoPHY driver for STiH407 family" + depends on USB_PHY + default y if ARCH_STI + help + This is the generic phy driver for the picoPHY ports + used by USB2 and USB3 Host controllers available on + STiH407 SoC families. + endmenu diff --git a/drivers/usb/phy/Makefile b/drivers/usb/phy/Makefile index 5314dcb..584cc96 100644 --- a/drivers/usb/phy/Makefile +++ b/drivers/usb/phy/Makefile @@ -9,3 +9,4 @@ obj-$(CONFIG_USB_PHY) += usb_phy_uclass.o obj-$(CONFIG_TWL4030_USB) += twl4030.o obj-$(CONFIG_OMAP_USB_PHY) += omap_usb_phy.o obj-$(CONFIG_ROCKCHIP_USB2_PHY) += rockchip_usb2_phy.o +obj-$(CONFIG_STI_USB_PHY) += sti_usb_phy.o diff --git a/drivers/usb/phy/sti_usb_phy.c b/drivers/usb/phy/sti_usb_phy.c new file mode 100644 index 0000000..9058246 --- /dev/null +++ b/drivers/usb/phy/sti_usb_phy.c @@ -0,0 +1,181 @@ +/* + * Copyright (c) 2017 + * Patrice Chotard patrice.chotard@st.com + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <common.h> +#include <asm/io.h> +#include <bitfield.h> +#include <dm.h> +#include <errno.h> +#include <fdtdec.h> +#include <libfdt.h> +#include <regmap.h> +#include <reset-uclass.h> +#include <syscon.h> +#include <usb_phy-uclass.h> +#include <wait_bit.h> + +#include <linux/bitops.h> +#include <linux/compat.h> + +DECLARE_GLOBAL_DATA_PTR; + +/* Default PHY_SEL and REFCLKSEL configuration */ +#define STIH407_USB_PICOPHY_CTRL_PORT_CONF 0x6 + +/* ports parameters overriding */ +#define STIH407_USB_PICOPHY_PARAM_DEF 0x39a4dc + +#define PHYPARAM_REG 1 +#define PHYCTRL_REG 2 +#define PHYPARAM_NB 3 + +struct sti_usb_phy { + struct regmap *regmap; + struct reset_ctl global_ctl; + struct reset_ctl port_ctl; + int param; + int ctrl; +}; + +static int sti_usb_phy_deassert(struct sti_usb_phy *phy) +{ + int ret; + + ret = reset_deassert(&phy->global_ctl); + if (ret < 0) { + error("PHY global deassert failed: %d", ret); + return ret; + } + + ret = reset_deassert(&phy->port_ctl); + if (ret < 0) + error("PHY port deassert failed: %d", ret); + + return ret; +} + +static int sti_usb_phy_init(struct usb_phy_desc *usb_phy_desc) +{ + struct udevice *dev = usb_phy_desc->dev; + struct sti_usb_phy *phy = dev_get_priv(dev); + void __iomem *reg; + + /* set ctrl picophy value */ + reg = (void __iomem *)phy->regmap->base + phy->ctrl; + /* CTRL_PORT mask is 0x1f */ + clrsetbits_le32(reg, 0x1f, STIH407_USB_PICOPHY_CTRL_PORT_CONF); + + /* set ports parameters overriding */ + reg = (void __iomem *)phy->regmap->base + phy->param; + /* PARAM_DEF mask is 0xffffffff */ + clrsetbits_le32(reg, 0xffffffff, STIH407_USB_PICOPHY_PARAM_DEF); + + return sti_usb_phy_deassert(phy); +} + +static int sti_usb_phy_exit(struct usb_phy_desc *usb_phy_desc) +{ + struct udevice *dev = usb_phy_desc->dev; + struct sti_usb_phy *phy = dev_get_priv(dev); + int ret; + + ret = reset_deassert(&phy->port_ctl); + if (ret < 0) { + error("PHY port deassert failed: %d", ret); + return ret; + } + + ret = reset_deassert(&phy->global_ctl); + if (ret < 0) + error("PHY global deassert failed: %d", ret); + + return ret; +} + +struct usb_phy_ops sti_usb_phy_ops = { + .init = sti_usb_phy_init, + .exit = sti_usb_phy_exit, +}; + +int sti_usb_phy_probe(struct udevice *dev) +{ + struct sti_usb_phy *priv = dev_get_priv(dev); + struct udevice *syscon; + struct fdtdec_phandle_args syscfg_phandle; + u32 cells[PHYPARAM_NB]; + int ret, count; + + /* get corresponding syscon phandle */ + ret = fdtdec_parse_phandle_with_args(gd->fdt_blob, dev->of_offset, + "st,syscfg", NULL, 0, 0, + &syscfg_phandle); + if (ret < 0) { + error("Can't get syscfg phandle: %d\n", ret); + return ret; + } + + ret = uclass_get_device_by_of_offset(UCLASS_SYSCON, syscfg_phandle.node, + &syscon); + if (ret) { + error("unable to find syscon device (%d)\n", ret); + return ret; + } + + priv->regmap = syscon_get_regmap(syscon); + if (!priv->regmap) { + error("unable to find regmap\n"); + return -ENODEV; + } + + /* get phy param offset */ + count = fdtdec_get_int_array_count(gd->fdt_blob, dev->of_offset, + "st,syscfg", cells, + ARRAY_SIZE(cells)); + + if (count < 0) { + error("Bad PHY st,syscfg property %d\n", count); + return -EINVAL; + } + + if (count > PHYPARAM_NB) { + error("Unsupported PHY param count %d\n", count); + return -EINVAL; + } + + priv->param = cells[PHYPARAM_REG]; + priv->ctrl = cells[PHYCTRL_REG]; + + /* get global reset control */ + ret = reset_get_by_name(dev, "global", &priv->global_ctl); + if (ret) { + error("can't get global reset for %s (%d)", dev->name, ret); + return ret; + } + + /* get port reset control */ + ret = reset_get_by_name(dev, "port", &priv->port_ctl); + if (ret) { + error("can't get port reset for %s (%d)", dev->name, ret); + return ret; + } + + return 0; +} + +static const struct udevice_id sti_usb_phy_ids[] = { + { .compatible = "st,stih407-usb2-phy" }, + { } +}; + +U_BOOT_DRIVER(sti_usb_phy) = { + .name = "sti_usb_phy", + .id = UCLASS_USB_PHY, + .of_match = sti_usb_phy_ids, + .probe = sti_usb_phy_probe, + .ops = &sti_usb_phy_ops, + .priv_auto_alloc_size = sizeof(struct sti_usb_phy), +};