From: Patrice Chotard patrice.chotard@st.com
This patch adds the ST glue logic to manage the DWC3 HC on STiH407 SoC family. It configures the internal glue logic and syscfg registers.
Part of this code been extracted from kernel.org driver (drivers/usb/dwc3/dwc3-st.c)
Signed-off-by: Patrice Chotard patrice.chotard@st.com --- v4: _ none
v3: _ rename dwc3-sti.c to dwc3-sti-glue.c _ respect device tree hierarchy, this driver is now responsible for xhci-sti binding (done in sti_dwc3_glue_bind())
v2: _ use setbits_le32() instead of read, modify, write sequence _ add missing parenthesis
arch/arm/include/asm/arch-stih410/sys_proto.h | 11 + doc/device-tree-bindings/usb/dwc3-st.txt | 60 ++++++ drivers/usb/host/Makefile | 2 +- drivers/usb/host/dwc3-sti-glue.c | 278 ++++++++++++++++++++++++++ include/dwc3-sti-glue.h | 43 ++++ 5 files changed, 393 insertions(+), 1 deletion(-) create mode 100644 arch/arm/include/asm/arch-stih410/sys_proto.h create mode 100644 doc/device-tree-bindings/usb/dwc3-st.txt create mode 100644 drivers/usb/host/dwc3-sti-glue.c create mode 100644 include/dwc3-sti-glue.h
diff --git a/arch/arm/include/asm/arch-stih410/sys_proto.h b/arch/arm/include/asm/arch-stih410/sys_proto.h new file mode 100644 index 0000000..5c40d3b --- /dev/null +++ b/arch/arm/include/asm/arch-stih410/sys_proto.h @@ -0,0 +1,11 @@ +/* + * Copyright (c) 2017 + * Patrice Chotard patrice.chotard@st.com + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#ifndef _ASM_ARCH_SYS_PROTO_H +#define _ASM_ARCH_SYS_PROTO_H + +#endif /* _ASM_ARCH_SYS_PROTO_H */ diff --git a/doc/device-tree-bindings/usb/dwc3-st.txt b/doc/device-tree-bindings/usb/dwc3-st.txt new file mode 100644 index 0000000..a26a139 --- /dev/null +++ b/doc/device-tree-bindings/usb/dwc3-st.txt @@ -0,0 +1,60 @@ +ST DWC3 glue logic + +This file documents the parameters for the dwc3-st driver. +This driver controls the glue logic used to configure the dwc3 core on +STiH407 based platforms. + +Required properties: + - compatible : must be "st,stih407-dwc3" + - reg : glue logic base address and USB syscfg ctrl register offset + - reg-names : should be "reg-glue" and "syscfg-reg" + - st,syscon : should be phandle to system configuration node which + encompasses the glue registers + - resets : list of phandle and reset specifier pairs. There should be two entries, one + for the powerdown and softreset lines of the usb3 IP + - reset-names : list of reset signal names. Names should be "powerdown" and "softreset" + + - #address-cells, #size-cells : should be '1' if the device has sub-nodes + with 'reg' property + + - pinctl-names : A pinctrl state named "default" must be defined + + - pinctrl-0 : Pin control group + + - ranges : allows valid 1:1 translation between child's address space and + parent's address space + +Sub-nodes: +The dwc3 core should be added as subnode to ST DWC3 glue as shown in the +example below. + +NB: The dr_mode property is NOT optional for this driver, as the default value +is "otg", which isn't supported by this SoC. Valid dr_mode values for dwc3-st are +either "host" or "device". + +Example: + +st_dwc3: dwc3@8f94000 { + status = "disabled"; + compatible = "st,stih407-dwc3"; + reg = <0x08f94000 0x1000>, <0x110 0x4>; + reg-names = "reg-glue", "syscfg-reg"; + st,syscfg = <&syscfg_core>; + resets = <&powerdown STIH407_USB3_POWERDOWN>, + <&softreset STIH407_MIPHY2_SOFTRESET>; + reset-names = "powerdown", "softreset"; + #address-cells = <1>; + #size-cells = <1>; + pinctrl-names = "default"; + pinctrl-0 = <&pinctrl_usb3>; + ranges; + + dwc3: dwc3@9900000 { + compatible = "snps,dwc3"; + reg = <0x09900000 0x100000>; + interrupts = <GIC_SPI 155 IRQ_TYPE_NONE>; + dr_mode = "host"; + phy-names = "usb2-phy", "usb3-phy"; + phys = <&usb2_picophy2>, <&phy_port2 PHY_TYPE_USB3>; + }; +}; diff --git a/drivers/usb/host/Makefile b/drivers/usb/host/Makefile index 40ff830..6be40b8 100644 --- a/drivers/usb/host/Makefile +++ b/drivers/usb/host/Makefile @@ -66,7 +66,7 @@ obj-$(CONFIG_USB_XHCI_FSL) += xhci-fsl.o obj-$(CONFIG_USB_XHCI_MVEBU) += xhci-mvebu.o obj-$(CONFIG_USB_XHCI_OMAP) += xhci-omap.o obj-$(CONFIG_USB_XHCI_PCI) += xhci-pci.o -obj-$(CONFIG_USB_XHCI_STI) += xhci-sti.o +obj-$(CONFIG_USB_XHCI_STI) += xhci-sti.o dwc3-sti-glue.o
# designware obj-$(CONFIG_USB_DWC2) += dwc2.o diff --git a/drivers/usb/host/dwc3-sti-glue.c b/drivers/usb/host/dwc3-sti-glue.c new file mode 100644 index 0000000..368d7ef --- /dev/null +++ b/drivers/usb/host/dwc3-sti-glue.c @@ -0,0 +1,278 @@ +/* + * STiH407 family DWC3 specific Glue layer + * + * Copyright (c) 2017 + * Patrice Chotard patrice.chotard@st.com + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <asm/io.h> +#include <common.h> +#include <dm.h> +#include <dwc3-sti-glue.h> +#include <errno.h> +#include <fdtdec.h> +#include <libfdt.h> +#include <dm/lists.h> +#include <regmap.h> +#include <reset-uclass.h> +#include <syscon.h> +#include <usb.h> + +#include <linux/usb/dwc3.h> + +DECLARE_GLOBAL_DATA_PTR; + +struct sti_dwc3_glue_platdata { + phys_addr_t syscfg_base; + phys_addr_t glue_base; + phys_addr_t syscfg_offset; + struct reset_ctl powerdown_ctl; + struct reset_ctl softreset_ctl; + enum usb_dr_mode mode; +}; + +static int sti_dwc3_glue_drd_init(struct sti_dwc3_glue_platdata *plat) +{ + unsigned long val; + + val = readl(plat->syscfg_base + plat->syscfg_offset); + + val &= USB3_CONTROL_MASK; + + switch (plat->mode) { + case USB_DR_MODE_PERIPHERAL: + val &= ~(USB3_DELAY_VBUSVALID + | USB3_SEL_FORCE_OPMODE | USB3_FORCE_OPMODE(0x3) + | USB3_SEL_FORCE_DPPULLDOWN2 | USB3_FORCE_DPPULLDOWN2 + | USB3_SEL_FORCE_DMPULLDOWN2 | USB3_FORCE_DMPULLDOWN2); + + val |= USB3_DEVICE_NOT_HOST | USB3_FORCE_VBUSVALID; + break; + + case USB_DR_MODE_HOST: + val &= ~(USB3_DEVICE_NOT_HOST | USB3_FORCE_VBUSVALID + | USB3_SEL_FORCE_OPMODE | USB3_FORCE_OPMODE(0x3) + | USB3_SEL_FORCE_DPPULLDOWN2 | USB3_FORCE_DPPULLDOWN2 + | USB3_SEL_FORCE_DMPULLDOWN2 | USB3_FORCE_DMPULLDOWN2); + + val |= USB3_DELAY_VBUSVALID; + break; + + default: + error("Unsupported mode of operation %d\n", plat->mode); + return -EINVAL; + } + return writel(val, plat->syscfg_base + plat->syscfg_offset); +} + +static void sti_dwc3_glue_init(struct sti_dwc3_glue_platdata *plat) +{ + unsigned long reg; + + reg = readl(plat->glue_base + CLKRST_CTRL); + + reg |= AUX_CLK_EN | EXT_CFG_RESET_N | XHCI_REVISION; + reg &= ~SW_PIPEW_RESET_N; + + writel(reg, plat->glue_base + CLKRST_CTRL); + + /* configure mux for vbus, powerpresent and bvalid signals */ + reg = readl(plat->glue_base + USB2_VBUS_MNGMNT_SEL1); + + reg |= SEL_OVERRIDE_VBUSVALID(USB2_VBUS_UTMIOTG) | + SEL_OVERRIDE_POWERPRESENT(USB2_VBUS_UTMIOTG) | + SEL_OVERRIDE_BVALID(USB2_VBUS_UTMIOTG); + + writel(reg, plat->glue_base + USB2_VBUS_MNGMNT_SEL1); + + setbits_le32(plat->glue_base + CLKRST_CTRL, SW_PIPEW_RESET_N); +} + +int sti_dwc3_init(enum usb_dr_mode mode) +{ + struct sti_dwc3_glue_platdata plat; + struct fdtdec_phandle_args syscfg_phandle; + struct udevice *syscon; + struct regmap *regmap; + int node, ret; + const void *blob = gd->fdt_blob; + u32 reg[4]; + + /* find the dwc3 node */ + node = fdt_node_offset_by_compatible(blob, -1, "st,stih407-dwc3"); + + ret = fdtdec_get_int_array(blob, node, "reg", reg, ARRAY_SIZE(reg)); + if (ret) { + error("unable to find st,stih407-dwc3 reg property(%d)\n", ret); + return ret; + } + + plat.glue_base = reg[0]; + plat.syscfg_offset = reg[2]; + plat.mode = mode; + + /* get corresponding syscon phandle */ + ret = fdtdec_parse_phandle_with_args(gd->fdt_blob, node, + "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; + } + + /* get syscfg-reg base address */ + regmap = syscon_get_regmap(syscon); + if (!regmap) { + error("unable to find regmap\n"); + return -ENODEV; + } + plat.syscfg_base = regmap->base; + + sti_dwc3_glue_drd_init(&plat); + sti_dwc3_glue_init(&plat); + + return 0; +} + +static int sti_dwc3_glue_ofdata_to_platdata(struct udevice *dev) +{ + struct sti_dwc3_glue_platdata *plat = dev_get_platdata(dev); + struct fdtdec_phandle_args syscfg_phandle; + struct udevice *syscon; + struct regmap *regmap; + int ret; + u32 reg[4]; + + ret = fdtdec_get_int_array(gd->fdt_blob, dev_of_offset(dev), + "reg", reg, ARRAY_SIZE(reg)); + if (ret) { + error("unable to find st,stih407-dwc3 reg property(%d)\n", ret); + return ret; + } + + plat->glue_base = reg[0]; + plat->syscfg_offset = reg[2]; + + /* get corresponding syscon phandle */ + ret = fdtdec_parse_phandle_with_args(gd->fdt_blob, dev_of_offset(dev), + "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; + } + + /* get syscfg-reg base address */ + regmap = syscon_get_regmap(syscon); + if (!regmap) { + error("unable to find regmap\n"); + return -ENODEV; + } + plat->syscfg_base = regmap->base; + + /* get powerdown reset */ + ret = reset_get_by_name(dev, "powerdown", &plat->powerdown_ctl); + if (ret) { + error("can't get powerdown reset for %s (%d)", dev->name, ret); + return ret; + } + + /* get softreset reset */ + ret = reset_get_by_name(dev, "softreset", &plat->softreset_ctl); + if (ret) + error("can't get soft reset for %s (%d)", dev->name, ret); + + return ret; +}; + +static int sti_dwc3_glue_bind(struct udevice *dev) +{ + int dwc3_node; + + /* check if one subnode is present */ + dwc3_node = fdt_first_subnode(gd->fdt_blob, dev_of_offset(dev)); + if (dwc3_node <= 0) { + error("Can't find subnode for %s\n", dev->name); + return -ENODEV; + } + + /* check if the subnode compatible string is the dwc3 one*/ + if (fdt_node_check_compatible(gd->fdt_blob, dwc3_node, + "snps,dwc3") != 0) { + error("Can't find dwc3 subnode for %s\n", dev->name); + return -ENODEV; + } + + return dm_scan_fdt_dev(dev); +} + +static int sti_dwc3_glue_probe(struct udevice *dev) +{ + struct sti_dwc3_glue_platdata *plat = dev_get_platdata(dev); + int ret; + + /* deassert both powerdown and softreset */ + ret = reset_deassert(&plat->powerdown_ctl); + if (ret < 0) { + error("DWC3 powerdown reset deassert failed: %d", ret); + return ret; + } + + ret = reset_deassert(&plat->softreset_ctl); + if (ret < 0) + error("DWC3 soft reset deassert failed: %d", ret); + + return ret; +} + +static int sti_dwc3_glue_remove(struct udevice *dev) +{ + struct sti_dwc3_glue_platdata *plat = dev_get_platdata(dev); + int ret; + + /* assert both powerdown and softreset */ + ret = reset_assert(&plat->powerdown_ctl); + if (ret < 0) { + error("DWC3 powerdown reset deassert failed: %d", ret); + return ret; + } + + ret = reset_assert(&plat->softreset_ctl); + if (ret < 0) + error("DWC3 soft reset deassert failed: %d", ret); + + return ret; +} + +static const struct udevice_id sti_dwc3_glue_ids[] = { + { .compatible = "st,stih407-dwc3" }, + { } +}; + +U_BOOT_DRIVER(dwc3_sti_glue) = { + .name = "dwc3_sti_glue", + .id = UCLASS_MISC, + .of_match = sti_dwc3_glue_ids, + .ofdata_to_platdata = sti_dwc3_glue_ofdata_to_platdata, + .probe = sti_dwc3_glue_probe, + .remove = sti_dwc3_glue_remove, + .bind = sti_dwc3_glue_bind, + .platdata_auto_alloc_size = sizeof(struct sti_dwc3_glue_platdata), + .flags = DM_FLAG_ALLOC_PRIV_DMA, +}; diff --git a/include/dwc3-sti-glue.h b/include/dwc3-sti-glue.h new file mode 100644 index 0000000..2083427 --- /dev/null +++ b/include/dwc3-sti-glue.h @@ -0,0 +1,43 @@ +/* + * Copyright (c) 2017 + * Patrice Chotard patrice.chotard@st.com + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#ifndef __DWC3_STI_UBOOT_H_ +#define __DWC3_STI_UBOOT_H_ + +#include <linux/usb/otg.h> + +/* glue registers */ +#define CLKRST_CTRL 0x00 +#define AUX_CLK_EN BIT(0) +#define SW_PIPEW_RESET_N BIT(4) +#define EXT_CFG_RESET_N BIT(8) + +#define XHCI_REVISION BIT(12) + +#define USB2_VBUS_MNGMNT_SEL1 0x2C +#define USB2_VBUS_UTMIOTG 0x1 + +#define SEL_OVERRIDE_VBUSVALID(n) ((n) << 0) +#define SEL_OVERRIDE_POWERPRESENT(n) ((n) << 4) +#define SEL_OVERRIDE_BVALID(n) ((n) << 8) + +/* Static DRD configuration */ +#define USB3_CONTROL_MASK 0xf77 + +#define USB3_DEVICE_NOT_HOST BIT(0) +#define USB3_FORCE_VBUSVALID BIT(1) +#define USB3_DELAY_VBUSVALID BIT(2) +#define USB3_SEL_FORCE_OPMODE BIT(4) +#define USB3_FORCE_OPMODE(n) ((n) << 5) +#define USB3_SEL_FORCE_DPPULLDOWN2 BIT(8) +#define USB3_FORCE_DPPULLDOWN2 BIT(9) +#define USB3_SEL_FORCE_DMPULLDOWN2 BIT(10) +#define USB3_FORCE_DMPULLDOWN2 BIT(11) + +int sti_dwc3_init(enum usb_dr_mode mode); + +#endif /* __DWC3_STI_UBOOT_H_ */