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/*
* STiH407 family DWC3 specific Glue layer
*
* Copyright (c) 2017
* Patrice Chotard <patrice.chotard@st.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <asm/io.h>
#include <dm.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>
#include <linux/usb/otg.h>
#include <dwc3-sti-glue.h>
DECLARE_GLOBAL_DATA_PTR;
/*
* struct sti_dwc3_glue_platdata - 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_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:
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_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);
}
static int sti_dwc3_glue_ofdata_to_platdata(struct udevice *dev)
{
struct sti_dwc3_glue_platdata *plat = dev_get_platdata(dev);
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) {
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->base;
/* 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_platdata *plat = dev_get_platdata(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) {
pr_err("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) {
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_platdata *plat = dev_get_platdata(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_platdata *plat = dev_get_platdata(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_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,
};
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