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u-boot/drivers/usb/dwc3/dwc3-meson-gxl.c
Neil Armstrong 043a9674b6 usb: dwc3-meson-gxl: force mode on child add/removal 
arch/mach-meson has some custom usb logic, in particular:
* on board_usb_init(), we force USB_DR_MODE_PERIPHERAL
* on board_usb_cleanup(), we force USB_DR_MODE_HOST

With DM_USB_GADGET=y, board_usb_init/cleanup() are no
longer used when we call usb_gadget_initialize().
Instead, the generic (from udc-uclass) initialization/release is
called, which itself calls the controller driver's probe()/remove().

Therefore, enabling DM_USB_GADGET=y will mean that this mode
switching will break.

To prepare for enabling DM_USB_GADGET, perform the mode switching
when the "amlogic,meson-g12a-usb" (dwc2) driver is
probed()/removed() instead.

This is achieved via the glue driver, which gets notified each time one
of its children is probed()/removed.

Note: this change should be harmless without DM_USB_GADGET=y
because the amlogic-g12a-usb driver is not probed via driver model.

Thanks for Mattijs for the original work at [1].

[1] https://lore.kernel.org/all/20221024-meson-dm-usb-v1-1-2ab077a503b9@baylibre.com/

Reviewed-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>
Reviewed-by: Marek Vasut <marex@denx.de>
Link: https://lore.kernel.org/r/20230117-u-boot-usb-gxl-otg-dm-v1-1-2853f6d75b06@linaro.org
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
2023-01-20 16:21:31 +01:00

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// SPDX-License-Identifier: GPL-2.0
/*
* Amlogic GXL DWC3 Glue layer
*
* Copyright (C) 2019 BayLibre, SAS
* Author: Neil Armstrong <narmstrong@baylibre.com>
*/
#define DEBUG
#include <common.h>
#include <asm-generic/io.h>
#include <dm.h>
#include <dm/device-internal.h>
#include <dm/lists.h>
#include <dwc3-uboot.h>
#include <generic-phy.h>
#include <linux/usb/ch9.h>
#include <linux/usb/gadget.h>
#include <malloc.h>
#include <regmap.h>
#include <usb.h>
#include "core.h"
#include "gadget.h"
#include <reset.h>
#include <clk.h>
#include <power/regulator.h>
#include <linux/bitfield.h>
#include <linux/bitops.h>
#include <linux/compat.h>
#include <asm/arch/usb-gx.h>
/* USB Glue Control Registers */
#define USB_R0 0x00
#define USB_R0_P30_FSEL_MASK GENMASK(5, 0)
#define USB_R0_P30_PHY_RESET BIT(6)
#define USB_R0_P30_TEST_POWERDOWN_HSP BIT(7)
#define USB_R0_P30_TEST_POWERDOWN_SSP BIT(8)
#define USB_R0_P30_ACJT_LEVEL_MASK GENMASK(13, 9)
#define USB_R0_P30_TX_BOOST_LEVEL_MASK GENMASK(16, 14)
#define USB_R0_P30_LANE0_TX2RX_LOOPBACK BIT(17)
#define USB_R0_P30_LANE0_EXT_PCLK_REQ BIT(18)
#define USB_R0_P30_PCS_RX_LOS_MASK_VAL_MASK GENMASK(28, 19)
#define USB_R0_U2D_SS_SCALEDOWN_MODE_MASK GENMASK(30, 29)
#define USB_R0_U2D_ACT BIT(31)
#define USB_R1 0x04
#define USB_R1_U3H_BIGENDIAN_GS BIT(0)
#define USB_R1_U3H_PME_ENABLE BIT(1)
#define USB_R1_U3H_HUB_PORT_OVERCURRENT_MASK GENMASK(6, 2)
#define USB_R1_U3H_HUB_PORT_PERM_ATTACH_MASK GENMASK(11, 7)
#define USB_R1_U3H_HOST_U2_PORT_DISABLE_MASK GENMASK(15, 12)
#define USB_R1_U3H_HOST_U3_PORT_DISABLE BIT(16)
#define USB_R1_U3H_HOST_PORT_POWER_CONTROL_PRESENT BIT(17)
#define USB_R1_U3H_HOST_MSI_ENABLE BIT(18)
#define USB_R1_U3H_FLADJ_30MHZ_REG_MASK GENMASK(24, 19)
#define USB_R1_P30_PCS_TX_SWING_FULL_MASK GENMASK(31, 25)
#define USB_R2 0x08
#define USB_R2_P30_CR_DATA_IN_MASK GENMASK(15, 0)
#define USB_R2_P30_CR_READ BIT(16)
#define USB_R2_P30_CR_WRITE BIT(17)
#define USB_R2_P30_CR_CAP_ADDR BIT(18)
#define USB_R2_P30_CR_CAP_DATA BIT(19)
#define USB_R2_P30_PCS_TX_DEEMPH_3P5DB_MASK GENMASK(25, 20)
#define USB_R2_P30_PCS_TX_DEEMPH_6DB_MASK GENMASK(31, 26)
#define USB_R3 0x0c
#define USB_R3_P30_SSC_ENABLE BIT(0)
#define USB_R3_P30_SSC_RANGE_MASK GENMASK(3, 1)
#define USB_R3_P30_SSC_REF_CLK_SEL_MASK GENMASK(12, 4)
#define USB_R3_P30_REF_SSP_EN BIT(13)
#define USB_R3_P30_LOS_BIAS_MASK GENMASK(18, 16)
#define USB_R3_P30_LOS_LEVEL_MASK GENMASK(23, 19)
#define USB_R3_P30_MPLL_MULTIPLIER_MASK GENMASK(30, 24)
#define USB_R4 0x10
#define USB_R4_P21_PORT_RESET_0 BIT(0)
#define USB_R4_P21_SLEEP_M0 BIT(1)
#define USB_R4_MEM_PD_MASK GENMASK(3, 2)
#define USB_R4_P21_ONLY BIT(4)
#define USB_R5 0x14
#define USB_R5_ID_DIG_SYNC BIT(0)
#define USB_R5_ID_DIG_REG BIT(1)
#define USB_R5_ID_DIG_CFG_MASK GENMASK(3, 2)
#define USB_R5_ID_DIG_EN_0 BIT(4)
#define USB_R5_ID_DIG_EN_1 BIT(5)
#define USB_R5_ID_DIG_CURR BIT(6)
#define USB_R5_ID_DIG_IRQ BIT(7)
#define USB_R5_ID_DIG_TH_MASK GENMASK(15, 8)
#define USB_R5_ID_DIG_CNT_MASK GENMASK(23, 16)
/* read-only register */
#define USB_R6 0x18
#define USB_R6_P30_CR_DATA_OUT_MASK GENMASK(15, 0)
#define USB_R6_P30_CR_ACK BIT(16)
enum {
USB2_HOST_PHY0 = 0,
USB2_OTG_PHY1,
USB2_HOST_PHY2,
PHY_COUNT,
};
static const char *phy_names[PHY_COUNT] = {
"usb2-phy0", "usb2-phy1", "usb2-phy2",
};
struct dwc3_meson_gxl {
struct udevice *dev;
struct regmap *regmap;
struct clk clk;
struct reset_ctl reset;
struct phy phys[PHY_COUNT];
enum usb_dr_mode otg_mode;
enum usb_dr_mode otg_phy_mode;
unsigned int usb2_ports;
#if CONFIG_IS_ENABLED(DM_REGULATOR)
struct udevice *vbus_supply;
#endif
};
#define U2P_REG_SIZE 0x20
#define USB_REG_OFFSET 0x80
#define USB2_OTG_PHY USB2_OTG_PHY1
static void dwc3_meson_gxl_usb2_set_mode(struct dwc3_meson_gxl *priv, enum usb_dr_mode mode)
{
switch (mode) {
case USB_DR_MODE_HOST:
case USB_DR_MODE_OTG:
case USB_DR_MODE_UNKNOWN:
regmap_update_bits(priv->regmap, USB_R1,
USB_R1_U3H_HOST_U2_PORT_DISABLE_MASK, 0);
regmap_update_bits(priv->regmap, USB_R0,
USB_R0_U2D_ACT, 0);
regmap_update_bits(priv->regmap, USB_R4,
USB_R4_P21_SLEEP_M0, 0);
break;
case USB_DR_MODE_PERIPHERAL:
regmap_update_bits(priv->regmap, USB_R0,
USB_R0_U2D_ACT, USB_R0_U2D_ACT);
regmap_update_bits(priv->regmap, USB_R0,
USB_R0_U2D_SS_SCALEDOWN_MODE_MASK, 0);
regmap_update_bits(priv->regmap, USB_R4,
USB_R4_P21_SLEEP_M0, USB_R4_P21_SLEEP_M0);
break;
}
}
static int dwc3_meson_gxl_usb2_init(struct dwc3_meson_gxl *priv)
{
int i;
for (i = 0; i < PHY_COUNT; ++i) {
if (!priv->phys[i].dev)
continue;
phy_meson_gxl_usb2_set_mode(&priv->phys[i],
(i == USB2_OTG_PHY) ? USB_DR_MODE_PERIPHERAL
: USB_DR_MODE_HOST);
}
return 0;
}
static int dwc3_meson_gxl_usb_init(struct dwc3_meson_gxl *priv)
{
int ret;
ret = dwc3_meson_gxl_usb2_init(priv);
if (ret)
return ret;
regmap_update_bits(priv->regmap, USB_R1,
USB_R1_U3H_FLADJ_30MHZ_REG_MASK,
FIELD_PREP(USB_R1_U3H_FLADJ_30MHZ_REG_MASK, 0x20));
regmap_update_bits(priv->regmap, USB_R5,
USB_R5_ID_DIG_EN_0,
USB_R5_ID_DIG_EN_0);
regmap_update_bits(priv->regmap, USB_R5,
USB_R5_ID_DIG_EN_1,
USB_R5_ID_DIG_EN_1);
regmap_update_bits(priv->regmap, USB_R5,
USB_R5_ID_DIG_TH_MASK,
FIELD_PREP(USB_R5_ID_DIG_TH_MASK, 0xff));
dwc3_meson_gxl_usb2_set_mode(priv, priv->otg_phy_mode);
return 0;
}
int dwc3_meson_gxl_force_mode(struct udevice *dev, enum usb_dr_mode mode)
{
struct dwc3_meson_gxl *priv = dev_get_plat(dev);
if (!priv)
return -EINVAL;
if (mode != USB_DR_MODE_HOST && mode != USB_DR_MODE_PERIPHERAL)
return -EINVAL;
if (!priv->phys[USB2_OTG_PHY].dev)
return -EINVAL;
if (mode == priv->otg_phy_mode)
return 0;
if (mode == USB_DR_MODE_HOST)
debug("%s: switching to Host Mode\n", __func__);
else
debug("%s: switching to Device Mode\n", __func__);
#if CONFIG_IS_ENABLED(DM_REGULATOR)
if (priv->vbus_supply) {
int ret = regulator_set_enable(priv->vbus_supply,
(mode == USB_DR_MODE_PERIPHERAL));
if (ret)
return ret;
}
#endif
priv->otg_phy_mode = mode;
phy_meson_gxl_usb2_set_mode(&priv->phys[USB2_OTG_PHY], mode);
dwc3_meson_gxl_usb2_set_mode(priv, mode);
return 0;
}
static int dwc3_meson_gxl_get_phys(struct dwc3_meson_gxl *priv)
{
int i, ret;
for (i = 0 ; i < PHY_COUNT ; ++i) {
ret = generic_phy_get_by_name(priv->dev, phy_names[i],
&priv->phys[i]);
if (ret == -ENOENT || ret == -ENODATA) {
priv->phys[i].dev = NULL;
continue;
}
if (ret)
return ret;
priv->usb2_ports++;
}
debug("%s: usb2 ports: %d\n", __func__, priv->usb2_ports);
return 0;
}
static int dwc3_meson_gxl_reset_init(struct dwc3_meson_gxl *priv)
{
int ret;
ret = reset_get_by_index(priv->dev, 0, &priv->reset);
if (ret)
return ret;
ret = reset_assert(&priv->reset);
udelay(1);
ret |= reset_deassert(&priv->reset);
if (ret) {
reset_free(&priv->reset);
return ret;
}
return 0;
}
static int dwc3_meson_gxl_clk_init(struct dwc3_meson_gxl *priv)
{
int ret;
ret = clk_get_by_index(priv->dev, 0, &priv->clk);
if (ret)
return ret;
#if CONFIG_IS_ENABLED(CLK)
ret = clk_enable(&priv->clk);
if (ret) {
clk_free(&priv->clk);
return ret;
}
#endif
return 0;
}
static int dwc3_meson_gxl_probe(struct udevice *dev)
{
struct dwc3_meson_gxl *priv = dev_get_plat(dev);
int ret, i;
priv->dev = dev;
ret = regmap_init_mem(dev_ofnode(dev), &priv->regmap);
if (ret)
return ret;
ret = dwc3_meson_gxl_clk_init(priv);
if (ret)
return ret;
ret = dwc3_meson_gxl_reset_init(priv);
if (ret)
return ret;
ret = dwc3_meson_gxl_get_phys(priv);
if (ret)
return ret;
#if CONFIG_IS_ENABLED(DM_REGULATOR)
ret = device_get_supply_regulator(dev, "vbus-supply",
&priv->vbus_supply);
if (ret && ret != -ENOENT) {
pr_err("Failed to get PHY regulator\n");
return ret;
}
if (priv->vbus_supply) {
ret = regulator_set_enable(priv->vbus_supply, true);
if (ret)
return ret;
}
#endif
/* On GXL PHY must be started in device mode for DWC2 init */
priv->otg_mode = USB_DR_MODE_PERIPHERAL;
ret = dwc3_meson_gxl_usb_init(priv);
if (ret)
return ret;
priv->otg_mode = usb_get_dr_mode(dev_ofnode(dev));
if (priv->otg_mode == USB_DR_MODE_PERIPHERAL)
priv->otg_phy_mode = USB_DR_MODE_PERIPHERAL;
else
priv->otg_phy_mode = USB_DR_MODE_HOST;
for (i = 0 ; i < PHY_COUNT ; ++i) {
if (!priv->phys[i].dev)
continue;
ret = generic_phy_init(&priv->phys[i]);
if (ret)
goto err_phy_init;
}
for (i = 0; i < PHY_COUNT; ++i) {
if (!priv->phys[i].dev)
continue;
ret = generic_phy_power_on(&priv->phys[i]);
if (ret)
goto err_phy_init;
}
if (priv->phys[USB2_OTG_PHY].dev)
phy_meson_gxl_usb2_set_mode(&priv->phys[USB2_OTG_PHY],
priv->otg_phy_mode);
dwc3_meson_gxl_usb2_set_mode(priv, priv->otg_phy_mode);
return 0;
err_phy_init:
for (i = 0 ; i < PHY_COUNT ; ++i) {
if (!priv->phys[i].dev)
continue;
generic_phy_exit(&priv->phys[i]);
}
return ret;
}
static int dwc3_meson_gxl_remove(struct udevice *dev)
{
struct dwc3_meson_gxl *priv = dev_get_plat(dev);
int i;
reset_release_all(&priv->reset, 1);
clk_release_all(&priv->clk, 1);
for (i = 0; i < PHY_COUNT; ++i) {
if (!priv->phys[i].dev)
continue;
generic_phy_power_off(&priv->phys[i]);
}
for (i = 0 ; i < PHY_COUNT ; ++i) {
if (!priv->phys[i].dev)
continue;
generic_phy_exit(&priv->phys[i]);
}
return dm_scan_fdt_dev(dev);
}
static int dwc3_meson_gxl_child_pre_probe(struct udevice *dev)
{
if (ofnode_device_is_compatible(dev_ofnode(dev), "amlogic,meson-g12a-usb"))
return dwc3_meson_gxl_force_mode(dev->parent, USB_DR_MODE_PERIPHERAL);
return 0;
}
static int dwc3_meson_gxl_child_post_remove(struct udevice *dev)
{
if (ofnode_device_is_compatible(dev_ofnode(dev), "amlogic,meson-g12a-usb"))
return dwc3_meson_gxl_force_mode(dev->parent, USB_DR_MODE_HOST);
return 0;
}
static const struct udevice_id dwc3_meson_gxl_ids[] = {
{ .compatible = "amlogic,meson-axg-usb-ctrl" },
{ .compatible = "amlogic,meson-gxl-usb-ctrl" },
{ .compatible = "amlogic,meson-gxm-usb-ctrl" },
{ }
};
U_BOOT_DRIVER(dwc3_generic_wrapper) = {
.name = "dwc3-meson-gxl",
.id = UCLASS_SIMPLE_BUS,
.of_match = dwc3_meson_gxl_ids,
.probe = dwc3_meson_gxl_probe,
.remove = dwc3_meson_gxl_remove,
.child_pre_probe = dwc3_meson_gxl_child_pre_probe,
.child_post_remove = dwc3_meson_gxl_child_post_remove,
.plat_auto = sizeof(struct dwc3_meson_gxl),
};
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