upstream u-boot with additional patches for our devices/boards:
https://lists.denx.de/pipermail/u-boot/2017-March/282789.html (AXP crashes) ;
Gbit ethernet patch for some LIME2 revisions ;
with SPI flash support
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256 lines
6.4 KiB
256 lines
6.4 KiB
// SPDX-License-Identifier: GPL-2.0+
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/*
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* STiH407 family DWC3 specific Glue layer
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*
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* Copyright (C) 2017, STMicroelectronics - All Rights Reserved
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* Author(s): Patrice Chotard, <patrice.chotard@st.com> for STMicroelectronics.
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*/
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#include <common.h>
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#include <asm/io.h>
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#include <dm.h>
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#include <errno.h>
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#include <fdtdec.h>
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#include <linux/libfdt.h>
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#include <dm/lists.h>
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#include <regmap.h>
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#include <reset-uclass.h>
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#include <syscon.h>
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#include <usb.h>
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#include <linux/usb/dwc3.h>
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#include <linux/usb/otg.h>
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#include <dwc3-sti-glue.h>
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DECLARE_GLOBAL_DATA_PTR;
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/*
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* struct sti_dwc3_glue_platdata - dwc3 STi glue driver private structure
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* @syscfg_base: addr for the glue syscfg
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* @glue_base: addr for the glue registers
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* @syscfg_offset: usb syscfg control offset
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* @powerdown_ctl: rest controller for powerdown signal
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* @softreset_ctl: reset controller for softreset signal
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* @mode: drd static host/device config
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*/
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struct sti_dwc3_glue_platdata {
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phys_addr_t syscfg_base;
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phys_addr_t glue_base;
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phys_addr_t syscfg_offset;
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struct reset_ctl powerdown_ctl;
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struct reset_ctl softreset_ctl;
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enum usb_dr_mode mode;
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};
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static int sti_dwc3_glue_drd_init(struct sti_dwc3_glue_platdata *plat)
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{
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unsigned long val;
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val = readl(plat->syscfg_base + plat->syscfg_offset);
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val &= USB3_CONTROL_MASK;
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switch (plat->mode) {
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case USB_DR_MODE_PERIPHERAL:
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val &= ~(USB3_DELAY_VBUSVALID
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| USB3_SEL_FORCE_OPMODE | USB3_FORCE_OPMODE(0x3)
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| USB3_SEL_FORCE_DPPULLDOWN2 | USB3_FORCE_DPPULLDOWN2
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| USB3_SEL_FORCE_DMPULLDOWN2 | USB3_FORCE_DMPULLDOWN2);
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val |= USB3_DEVICE_NOT_HOST | USB3_FORCE_VBUSVALID;
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break;
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case USB_DR_MODE_HOST:
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val &= ~(USB3_DEVICE_NOT_HOST | USB3_FORCE_VBUSVALID
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| USB3_SEL_FORCE_OPMODE | USB3_FORCE_OPMODE(0x3)
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| USB3_SEL_FORCE_DPPULLDOWN2 | USB3_FORCE_DPPULLDOWN2
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| USB3_SEL_FORCE_DMPULLDOWN2 | USB3_FORCE_DMPULLDOWN2);
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val |= USB3_DELAY_VBUSVALID;
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break;
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default:
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pr_err("Unsupported mode of operation %d\n", plat->mode);
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return -EINVAL;
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}
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writel(val, plat->syscfg_base + plat->syscfg_offset);
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return 0;
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}
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static void sti_dwc3_glue_init(struct sti_dwc3_glue_platdata *plat)
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{
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unsigned long reg;
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reg = readl(plat->glue_base + CLKRST_CTRL);
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reg |= AUX_CLK_EN | EXT_CFG_RESET_N | XHCI_REVISION;
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reg &= ~SW_PIPEW_RESET_N;
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writel(reg, plat->glue_base + CLKRST_CTRL);
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/* configure mux for vbus, powerpresent and bvalid signals */
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reg = readl(plat->glue_base + USB2_VBUS_MNGMNT_SEL1);
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reg |= SEL_OVERRIDE_VBUSVALID(USB2_VBUS_UTMIOTG) |
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SEL_OVERRIDE_POWERPRESENT(USB2_VBUS_UTMIOTG) |
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SEL_OVERRIDE_BVALID(USB2_VBUS_UTMIOTG);
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writel(reg, plat->glue_base + USB2_VBUS_MNGMNT_SEL1);
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setbits_le32(plat->glue_base + CLKRST_CTRL, SW_PIPEW_RESET_N);
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}
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static int sti_dwc3_glue_ofdata_to_platdata(struct udevice *dev)
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{
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struct sti_dwc3_glue_platdata *plat = dev_get_platdata(dev);
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struct udevice *syscon;
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struct regmap *regmap;
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int ret;
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u32 reg[4];
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ret = fdtdec_get_int_array(gd->fdt_blob, dev_of_offset(dev),
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"reg", reg, ARRAY_SIZE(reg));
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if (ret) {
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pr_err("unable to find st,stih407-dwc3 reg property(%d)\n", ret);
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return ret;
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}
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plat->glue_base = reg[0];
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plat->syscfg_offset = reg[2];
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/* get corresponding syscon phandle */
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ret = uclass_get_device_by_phandle(UCLASS_SYSCON, dev, "st,syscfg",
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&syscon);
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if (ret) {
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pr_err("unable to find syscon device (%d)\n", ret);
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return ret;
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}
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/* get syscfg-reg base address */
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regmap = syscon_get_regmap(syscon);
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if (!regmap) {
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pr_err("unable to find regmap\n");
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return -ENODEV;
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}
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plat->syscfg_base = regmap->ranges[0].start;
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/* get powerdown reset */
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ret = reset_get_by_name(dev, "powerdown", &plat->powerdown_ctl);
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if (ret) {
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pr_err("can't get powerdown reset for %s (%d)", dev->name, ret);
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return ret;
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}
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/* get softreset reset */
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ret = reset_get_by_name(dev, "softreset", &plat->softreset_ctl);
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if (ret)
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pr_err("can't get soft reset for %s (%d)", dev->name, ret);
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return ret;
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};
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static int sti_dwc3_glue_bind(struct udevice *dev)
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{
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struct sti_dwc3_glue_platdata *plat = dev_get_platdata(dev);
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int dwc3_node;
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/* check if one subnode is present */
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dwc3_node = fdt_first_subnode(gd->fdt_blob, dev_of_offset(dev));
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if (dwc3_node <= 0) {
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pr_err("Can't find subnode for %s\n", dev->name);
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return -ENODEV;
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}
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/* check if the subnode compatible string is the dwc3 one*/
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if (fdt_node_check_compatible(gd->fdt_blob, dwc3_node,
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"snps,dwc3") != 0) {
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pr_err("Can't find dwc3 subnode for %s\n", dev->name);
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return -ENODEV;
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}
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/* retrieve the DWC3 dual role mode */
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plat->mode = usb_get_dr_mode(dwc3_node);
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if (plat->mode == USB_DR_MODE_UNKNOWN)
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/* by default set dual role mode to HOST */
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plat->mode = USB_DR_MODE_HOST;
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return dm_scan_fdt_dev(dev);
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}
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static int sti_dwc3_glue_probe(struct udevice *dev)
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{
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struct sti_dwc3_glue_platdata *plat = dev_get_platdata(dev);
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int ret;
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/* deassert both powerdown and softreset */
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ret = reset_deassert(&plat->powerdown_ctl);
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if (ret < 0) {
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pr_err("DWC3 powerdown reset deassert failed: %d", ret);
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return ret;
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}
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ret = reset_deassert(&plat->softreset_ctl);
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if (ret < 0) {
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pr_err("DWC3 soft reset deassert failed: %d", ret);
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goto softreset_err;
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}
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ret = sti_dwc3_glue_drd_init(plat);
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if (ret)
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goto init_err;
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sti_dwc3_glue_init(plat);
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return 0;
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init_err:
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ret = reset_assert(&plat->softreset_ctl);
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if (ret < 0) {
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pr_err("DWC3 soft reset deassert failed: %d", ret);
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return ret;
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}
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softreset_err:
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ret = reset_assert(&plat->powerdown_ctl);
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if (ret < 0)
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pr_err("DWC3 powerdown reset deassert failed: %d", ret);
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return ret;
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}
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static int sti_dwc3_glue_remove(struct udevice *dev)
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{
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struct sti_dwc3_glue_platdata *plat = dev_get_platdata(dev);
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int ret;
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/* assert both powerdown and softreset */
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ret = reset_assert(&plat->powerdown_ctl);
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if (ret < 0) {
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pr_err("DWC3 powerdown reset deassert failed: %d", ret);
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return ret;
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}
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ret = reset_assert(&plat->softreset_ctl);
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if (ret < 0)
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pr_err("DWC3 soft reset deassert failed: %d", ret);
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return ret;
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}
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static const struct udevice_id sti_dwc3_glue_ids[] = {
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{ .compatible = "st,stih407-dwc3" },
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{ }
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};
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U_BOOT_DRIVER(dwc3_sti_glue) = {
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.name = "dwc3_sti_glue",
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.id = UCLASS_MISC,
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.of_match = sti_dwc3_glue_ids,
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.ofdata_to_platdata = sti_dwc3_glue_ofdata_to_platdata,
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.probe = sti_dwc3_glue_probe,
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.remove = sti_dwc3_glue_remove,
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.bind = sti_dwc3_glue_bind,
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.platdata_auto_alloc_size = sizeof(struct sti_dwc3_glue_platdata),
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.flags = DM_FLAG_ALLOC_PRIV_DMA,
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};
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