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u-boot/drivers/usb/dwc3/dwc3-meson-g12a.c
Neil Armstrong adb049abf7 usb: dwc3: Add Meson G12A USB Glue 
Adds support for Amlogic G12A USB Control Glue HW.

The Amlogic G12A SoC Family embeds 2 USB Controllers :
- a DWC3 IP configured as Host for USB2 and USB3
- a DWC2 IP configured as Peripheral USB2 Only

A glue connects these both controllers to 2 USB2 PHYs, and optionnally
to an USB3+PCIE Combo PHY shared with the PCIE controller.

The Glue configures the UTMI 8bit interfaces for the USB2 PHYs, including
routing of the OTG PHY between the DWC3 and DWC2 controllers, and
setups the on-chip OTG mode selection for this PHY.

This driver sets the OTG capable port as Host mode by default,
the switch to Device mode is to be done in a separate patch.

Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Reviewed-by: Marek Vasut <marex@denx.de>
2019-05-09 10:38:32 +02:00

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// SPDX-License-Identifier: GPL-2.0
/*
* Amlogic G12A DWC3 Glue layer
*
* Copyright (C) 2019 BayLibre, SAS
* Author: Neil Armstrong <narmstrong@baylibre.com>
*/
#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>
/* USB2 Ports Control Registers */
#define U2P_REG_SIZE 0x20
#define U2P_R0 0x0
#define U2P_R0_HOST_DEVICE BIT(0)
#define U2P_R0_POWER_OK BIT(1)
#define U2P_R0_HAST_MODE BIT(2)
#define U2P_R0_POWER_ON_RESET BIT(3)
#define U2P_R0_ID_PULLUP BIT(4)
#define U2P_R0_DRV_VBUS BIT(5)
#define U2P_R1 0x4
#define U2P_R1_PHY_READY BIT(0)
#define U2P_R1_ID_DIG BIT(1)
#define U2P_R1_OTG_SESSION_VALID BIT(2)
#define U2P_R1_VBUS_VALID BIT(3)
/* USB Glue Control Registers */
#define USB_R0 0x80
#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 0x84
#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(4, 2)
#define USB_R1_U3H_HUB_PORT_PERM_ATTACH_MASK GENMASK(9, 7)
#define USB_R1_U3H_HOST_U2_PORT_DISABLE_MASK GENMASK(13, 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 0x88
#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 0x8c
#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_R4 0x90
#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 0x94
#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)
enum {
USB2_HOST_PHY = 0,
USB2_OTG_PHY,
USB3_HOST_PHY,
PHY_COUNT,
};
static const char *phy_names[PHY_COUNT] = {
"usb2-phy0", "usb2-phy1", "usb3-phy0",
};
struct dwc3_meson_g12a {
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;
unsigned int usb3_ports;
#if CONFIG_IS_ENABLED(DM_REGULATOR)
struct udevice *vbus_supply;
#endif
};
#define U2P_REG_SIZE 0x20
#define USB_REG_OFFSET 0x80
static void dwc3_meson_g12a_usb2_set_mode(struct dwc3_meson_g12a *priv,
int i, 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, U2P_R0 + (U2P_REG_SIZE * i),
U2P_R0_HOST_DEVICE,
U2P_R0_HOST_DEVICE);
break;
case USB_DR_MODE_PERIPHERAL:
regmap_update_bits(priv->regmap, U2P_R0 + (U2P_REG_SIZE * i),
U2P_R0_HOST_DEVICE, 0);
break;
}
}
static int dwc3_meson_g12a_usb2_init(struct dwc3_meson_g12a *priv)
{
int i;
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 < USB3_HOST_PHY ; ++i) {
if (!priv->phys[i].dev)
continue;
regmap_update_bits(priv->regmap, U2P_R0 + (U2P_REG_SIZE * i),
U2P_R0_POWER_ON_RESET,
U2P_R0_POWER_ON_RESET);
if (i == USB2_OTG_PHY) {
regmap_update_bits(priv->regmap,
U2P_R0 + (U2P_REG_SIZE * i),
U2P_R0_ID_PULLUP | U2P_R0_DRV_VBUS,
U2P_R0_ID_PULLUP | U2P_R0_DRV_VBUS);
dwc3_meson_g12a_usb2_set_mode(priv, i,
priv->otg_phy_mode);
} else
dwc3_meson_g12a_usb2_set_mode(priv, i,
USB_DR_MODE_HOST);
regmap_update_bits(priv->regmap, U2P_R0 + (U2P_REG_SIZE * i),
U2P_R0_POWER_ON_RESET, 0);
}
return 0;
}
static void dwc3_meson_g12a_usb3_init(struct dwc3_meson_g12a *priv)
{
regmap_update_bits(priv->regmap, USB_R3,
USB_R3_P30_SSC_RANGE_MASK |
USB_R3_P30_REF_SSP_EN,
USB_R3_P30_SSC_ENABLE |
FIELD_PREP(USB_R3_P30_SSC_RANGE_MASK, 2) |
USB_R3_P30_REF_SSP_EN);
udelay(2);
regmap_update_bits(priv->regmap, USB_R2,
USB_R2_P30_PCS_TX_DEEMPH_3P5DB_MASK,
FIELD_PREP(USB_R2_P30_PCS_TX_DEEMPH_3P5DB_MASK, 0x15));
regmap_update_bits(priv->regmap, USB_R2,
USB_R2_P30_PCS_TX_DEEMPH_6DB_MASK,
FIELD_PREP(USB_R2_P30_PCS_TX_DEEMPH_6DB_MASK, 0x20));
udelay(2);
regmap_update_bits(priv->regmap, USB_R1,
USB_R1_U3H_HOST_PORT_POWER_CONTROL_PRESENT,
USB_R1_U3H_HOST_PORT_POWER_CONTROL_PRESENT);
regmap_update_bits(priv->regmap, USB_R1,
USB_R1_P30_PCS_TX_SWING_FULL_MASK,
FIELD_PREP(USB_R1_P30_PCS_TX_SWING_FULL_MASK, 127));
}
static void dwc3_meson_g12a_usb_init_mode(struct dwc3_meson_g12a *priv)
{
if (priv->otg_phy_mode == 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);
} else {
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);
}
}
static int dwc3_meson_g12a_usb_init(struct dwc3_meson_g12a *priv)
{
int ret;
ret = dwc3_meson_g12a_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));
/* If we have an actual SuperSpeed port, initialize it */
if (priv->usb3_ports)
dwc3_meson_g12a_usb3_init(priv);
dwc3_meson_g12a_usb_init_mode(priv);
return 0;
}
int dwc3_meson_g12a_force_mode(struct udevice *dev, enum usb_dr_mode mode)
{
struct dwc3_meson_g12a *priv = dev_get_platdata(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_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;
dwc3_meson_g12a_usb2_set_mode(priv, USB2_OTG_PHY, mode);
dwc3_meson_g12a_usb_init_mode(priv);
return 0;
}
static int dwc3_meson_g12a_get_phys(struct dwc3_meson_g12a *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)
continue;
if (ret)
return ret;
if (i == USB3_HOST_PHY)
priv->usb3_ports++;
else
priv->usb2_ports++;
}
debug("%s: usb2 ports: %d\n", __func__, priv->usb2_ports);
debug("%s: usb3 ports: %d\n", __func__, priv->usb3_ports);
return 0;
}
static int dwc3_meson_g12a_reset_init(struct dwc3_meson_g12a *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_g12a_clk_init(struct dwc3_meson_g12a *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_g12a_probe(struct udevice *dev)
{
struct dwc3_meson_g12a *priv = dev_get_platdata(dev);
int ret, i;
priv->dev = dev;
ret = regmap_init_mem(dev_ofnode(dev), &priv->regmap);
if (ret)
return ret;
ret = dwc3_meson_g12a_clk_init(priv);
if (ret)
return ret;
ret = dwc3_meson_g12a_reset_init(priv);
if (ret)
return ret;
ret = dwc3_meson_g12a_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
priv->otg_mode = usb_get_dr_mode(dev_of_offset(dev));
ret = dwc3_meson_g12a_usb_init(priv);
if (ret)
return ret;
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;
}
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_g12a_remove(struct udevice *dev)
{
struct dwc3_meson_g12a *priv = dev_get_platdata(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_exit(&priv->phys[i]);
}
return dm_scan_fdt_dev(dev);
}
static const struct udevice_id dwc3_meson_g12a_ids[] = {
{ .compatible = "amlogic,meson-g12a-usb-ctrl" },
{ }
};
U_BOOT_DRIVER(dwc3_generic_wrapper) = {
.name = "dwc3-meson-g12a",
.id = UCLASS_SIMPLE_BUS,
.of_match = dwc3_meson_g12a_ids,
.probe = dwc3_meson_g12a_probe,
.remove = dwc3_meson_g12a_remove,
.platdata_auto_alloc_size = sizeof(struct dwc3_meson_g12a),
};
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