diff options
Diffstat (limited to 'roms/u-boot/drivers/usb/host/dwc3-sti-glue.c')
| -rw-r--r-- | roms/u-boot/drivers/usb/host/dwc3-sti-glue.c | 253 |
1 files changed, 253 insertions, 0 deletions
diff --git a/roms/u-boot/drivers/usb/host/dwc3-sti-glue.c b/roms/u-boot/drivers/usb/host/dwc3-sti-glue.c new file mode 100644 index 000000000..239b671ac --- /dev/null +++ b/roms/u-boot/drivers/usb/host/dwc3-sti-glue.c @@ -0,0 +1,253 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * STiH407 family DWC3 specific Glue layer + * + * Copyright (C) 2017, STMicroelectronics - All Rights Reserved + * Author(s): Patrice Chotard, <patrice.chotard@foss.st.com> for STMicroelectronics. + */ + +#include <common.h> +#include <log.h> +#include <asm/global_data.h> +#include <asm/io.h> +#include <dm.h> +#include <errno.h> +#include <dm/lists.h> +#include <regmap.h> +#include <reset-uclass.h> +#include <syscon.h> +#include <usb.h> + +#include <linux/usb/dwc3.h> +#include <linux/usb/otg.h> +#include <dwc3-sti-glue.h> + +DECLARE_GLOBAL_DATA_PTR; + +/* + * struct sti_dwc3_glue_plat - dwc3 STi glue driver private structure + * @syscfg_base: addr for the glue syscfg + * @glue_base: addr for the glue registers + * @syscfg_offset: usb syscfg control offset + * @powerdown_ctl: rest controller for powerdown signal + * @softreset_ctl: reset controller for softreset signal + * @mode: drd static host/device config + */ +struct sti_dwc3_glue_plat { + 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_plat *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: + pr_err("Unsupported mode of operation %d\n", plat->mode); + return -EINVAL; + } + writel(val, plat->syscfg_base + plat->syscfg_offset); + + return 0; +} + +static void sti_dwc3_glue_init(struct sti_dwc3_glue_plat *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); +} + +static int sti_dwc3_glue_of_to_plat(struct udevice *dev) +{ + struct sti_dwc3_glue_plat *plat = dev_get_plat(dev); + struct udevice *syscon; + struct regmap *regmap; + int ret; + u32 reg[4]; + + ret = ofnode_read_u32_array(dev_ofnode(dev), "reg", reg, + ARRAY_SIZE(reg)); + if (ret) { + pr_err("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 = uclass_get_device_by_phandle(UCLASS_SYSCON, dev, "st,syscfg", + &syscon); + if (ret) { + pr_err("unable to find syscon device (%d)\n", ret); + return ret; + } + + /* get syscfg-reg base address */ + regmap = syscon_get_regmap(syscon); + if (!regmap) { + pr_err("unable to find regmap\n"); + return -ENODEV; + } + plat->syscfg_base = regmap->ranges[0].start; + + /* get powerdown reset */ + ret = reset_get_by_name(dev, "powerdown", &plat->powerdown_ctl); + if (ret) { + pr_err("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) + pr_err("can't get soft reset for %s (%d)", dev->name, ret); + + return ret; +}; + +static int sti_dwc3_glue_bind(struct udevice *dev) +{ + struct sti_dwc3_glue_plat *plat = dev_get_plat(dev); + ofnode node, dwc3_node; + + /* Find snps,dwc3 node from subnode */ + ofnode_for_each_subnode(node, dev_ofnode(dev)) { + if (ofnode_device_is_compatible(node, "snps,dwc3")) + dwc3_node = node; + } + + if (!ofnode_valid(dwc3_node)) { + pr_err("Can't find dwc3 subnode for %s\n", dev->name); + return -ENODEV; + } + + /* retrieve the DWC3 dual role mode */ + plat->mode = usb_get_dr_mode(dwc3_node); + if (plat->mode == USB_DR_MODE_UNKNOWN) + /* by default set dual role mode to HOST */ + plat->mode = USB_DR_MODE_HOST; + + return dm_scan_fdt_dev(dev); +} + +static int sti_dwc3_glue_probe(struct udevice *dev) +{ + struct sti_dwc3_glue_plat *plat = dev_get_plat(dev); + int ret; + + /* deassert both powerdown and softreset */ + ret = reset_deassert(&plat->powerdown_ctl); + if (ret < 0) { + pr_err("DWC3 powerdown reset deassert failed: %d", ret); + return ret; + } + + ret = reset_deassert(&plat->softreset_ctl); + if (ret < 0) { + pr_err("DWC3 soft reset deassert failed: %d", ret); + goto softreset_err; + } + + ret = sti_dwc3_glue_drd_init(plat); + if (ret) + goto init_err; + + sti_dwc3_glue_init(plat); + + return 0; + +init_err: + ret = reset_assert(&plat->softreset_ctl); + if (ret < 0) { + pr_err("DWC3 soft reset deassert failed: %d", ret); + return ret; + } + +softreset_err: + ret = reset_assert(&plat->powerdown_ctl); + if (ret < 0) + pr_err("DWC3 powerdown reset deassert failed: %d", ret); + + return ret; +} + +static int sti_dwc3_glue_remove(struct udevice *dev) +{ + struct sti_dwc3_glue_plat *plat = dev_get_plat(dev); + int ret; + + /* assert both powerdown and softreset */ + ret = reset_assert(&plat->powerdown_ctl); + if (ret < 0) { + pr_err("DWC3 powerdown reset deassert failed: %d", ret); + return ret; + } + + ret = reset_assert(&plat->softreset_ctl); + if (ret < 0) + pr_err("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_NOP, + .of_match = sti_dwc3_glue_ids, + .of_to_plat = sti_dwc3_glue_of_to_plat, + .probe = sti_dwc3_glue_probe, + .remove = sti_dwc3_glue_remove, + .bind = sti_dwc3_glue_bind, + .plat_auto = sizeof(struct sti_dwc3_glue_plat), + .flags = DM_FLAG_ALLOC_PRIV_DMA, +}; 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