blob: c3d9972397aac2a29eee369a11ab8830166c82e1 [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0+
/**
* PCIe SERDES driver for AM654x SoC
*
* Copyright (C) 2018 Texas Instruments
* Author: Kishon Vijay Abraham I <kishon@ti.com>
*/
#include <clk-uclass.h>
#include <dm.h>
#include <log.h>
#include <dm/device.h>
#include <dm/device_compat.h>
#include <dm/lists.h>
#include <dt-bindings/phy/phy.h>
#include <generic-phy.h>
#include <asm/io.h>
#include <power-domain.h>
#include <regmap.h>
#include <syscon.h>
#include <linux/bitops.h>
#include <linux/delay.h>
#include <linux/err.h>
#define CMU_R07C 0x7c
#define CMU_MASTER_CDN_O BIT(24)
#define COMLANE_R138 0xb38
#define CFG_VERSION_REG_MASK GENMASK(23, 16)
#define CFG_VERSION_REG_SHIFT 16
#define VERSION 0x70
#define COMLANE_R190 0xb90
#define L1_MASTER_CDN_O BIT(9)
#define COMLANE_R194 0xb94
#define CMU_OK_I_0 BIT(19)
#define SERDES_CTRL 0x1fd0
#define POR_EN BIT(29)
#define WIZ_LANEXCTL_STS 0x1fe0
#define TX0_ENABLE_OVL BIT(31)
#define TX0_ENABLE_MASK GENMASK(30, 29)
#define TX0_ENABLE_SHIFT 29
#define TX0_DISABLE_STATE 0x0
#define TX0_SLEEP_STATE 0x1
#define TX0_SNOOZE_STATE 0x2
#define TX0_ENABLE_STATE 0x3
#define RX0_ENABLE_OVL BIT(15)
#define RX0_ENABLE_MASK GENMASK(14, 13)
#define RX0_ENABLE_SHIFT 13
#define RX0_DISABLE_STATE 0x0
#define RX0_SLEEP_STATE 0x1
#define RX0_SNOOZE_STATE 0x2
#define RX0_ENABLE_STATE 0x3
#define WIZ_PLL_CTRL 0x1ff4
#define PLL_ENABLE_OVL BIT(31)
#define PLL_ENABLE_MASK GENMASK(30, 29)
#define PLL_ENABLE_SHIFT 29
#define PLL_DISABLE_STATE 0x0
#define PLL_SLEEP_STATE 0x1
#define PLL_SNOOZE_STATE 0x2
#define PLL_ENABLE_STATE 0x3
#define PLL_OK BIT(28)
#define PLL_LOCK_TIME 1000 /* in milliseconds */
#define SLEEP_TIME 100 /* in microseconds */
#define LANE_USB3 0x0
#define LANE_PCIE0_LANE0 0x1
#define LANE_PCIE1_LANE0 0x0
#define LANE_PCIE0_LANE1 0x1
#define SERDES_NUM_CLOCKS 3
/* SERDES control MMR bit offsets */
#define SERDES_CTL_LANE_FUNC_SEL_SHIFT 0
#define SERDES_CTL_LANE_FUNC_SEL_MASK GENMASK(1, 0)
#define SERDES_CTL_CLK_SEL_SHIFT 4
#define SERDES_CTL_CLK_SEL_MASK GENMASK(7, 4)
/**
* struct serdes_am654_mux_clk_data - clock controller information structure
*/
struct serdes_am654_mux_clk_data {
struct regmap *regmap;
struct clk_bulk parents;
};
static int serdes_am654_mux_clk_probe(struct udevice *dev)
{
struct serdes_am654_mux_clk_data *data = dev_get_priv(dev);
struct udevice *syscon;
struct regmap *regmap;
int ret;
debug("%s(dev=%s)\n", __func__, dev->name);
if (!data)
return -ENOMEM;
ret = uclass_get_device_by_phandle(UCLASS_SYSCON, dev,
"ti,serdes-clk", &syscon);
if (ret) {
dev_err(dev, "unable to find syscon device\n");
return ret;
}
regmap = syscon_get_regmap(syscon);
if (IS_ERR(regmap)) {
dev_err(dev, "Fail to get Syscon regmap\n");
return PTR_ERR(regmap);
}
data->regmap = regmap;
ret = clk_get_bulk(dev, &data->parents);
if (ret) {
dev_err(dev, "Failed to obtain parent clocks\n");
return ret;
}
return 0;
}
static int mux_table[SERDES_NUM_CLOCKS][3] = {
/*
* The entries represent values for selecting between
* {left input, external reference clock, right input}
* Only one of Left Output or Right Output should be used since
* both left and right output clock uses the same bits and modifying
* one clock will impact the other.
*/
{ BIT(2), 0, BIT(0) }, /* Mux of CMU refclk */
{ -1, BIT(3), BIT(1) }, /* Mux of Left Output */
{ BIT(1), BIT(3) | BIT(1), -1 }, /* Mux of Right Output */
};
static int serdes_am654_mux_clk_set_parent(struct clk *clk, struct clk *parent)
{
struct serdes_am654_mux_clk_data *data = dev_get_priv(clk->dev);
u32 val;
int i;
debug("%s(clk=%s, parent=%s)\n", __func__, clk->dev->name,
parent->dev->name);
/*
* Since we have the same device-tree node represent both the
* clock and serdes device, we have two devices associated with
* the serdes node. assigned-clocks for this node is processed twice,
* once for the clock device and another time for the serdes
* device. When it is processed for the clock device, it is before
* the probe for clock device has been called. We ignore this case
* and rely on assigned-clocks to be processed correctly for the
* serdes case.
*/
if (!data->regmap)
return 0;
for (i = 0; i < data->parents.count; i++) {
if (clk_is_match(&data->parents.clks[i], parent))
break;
}
if (i >= data->parents.count)
return -EINVAL;
val = mux_table[clk->id][i];
val <<= SERDES_CTL_CLK_SEL_SHIFT;
regmap_update_bits(data->regmap, 0, SERDES_CTL_CLK_SEL_MASK, val);
return 0;
}
static struct clk_ops serdes_am654_mux_clk_ops = {
.set_parent = serdes_am654_mux_clk_set_parent,
};
U_BOOT_DRIVER(serdes_am654_mux_clk) = {
.name = "ti-serdes-am654-mux-clk",
.id = UCLASS_CLK,
.probe = serdes_am654_mux_clk_probe,
.priv_auto = sizeof(struct serdes_am654_mux_clk_data),
.ops = &serdes_am654_mux_clk_ops,
};
struct serdes_am654 {
struct regmap *regmap;
struct regmap *serdes_ctl;
};
static int serdes_am654_enable_pll(struct serdes_am654 *phy)
{
u32 mask = PLL_ENABLE_OVL | PLL_ENABLE_MASK;
u32 val = PLL_ENABLE_OVL | (PLL_ENABLE_STATE << PLL_ENABLE_SHIFT);
regmap_update_bits(phy->regmap, WIZ_PLL_CTRL, mask, val);
return regmap_read_poll_timeout(phy->regmap, WIZ_PLL_CTRL, val,
val & PLL_OK, 1000, PLL_LOCK_TIME);
}
static void serdes_am654_disable_pll(struct serdes_am654 *phy)
{
u32 mask = PLL_ENABLE_OVL | PLL_ENABLE_MASK;
regmap_update_bits(phy->regmap, WIZ_PLL_CTRL, mask, 0);
}
static int serdes_am654_enable_txrx(struct serdes_am654 *phy)
{
u32 mask;
u32 val;
/* Enable TX */
mask = TX0_ENABLE_OVL | TX0_ENABLE_MASK;
val = TX0_ENABLE_OVL | (TX0_ENABLE_STATE << TX0_ENABLE_SHIFT);
regmap_update_bits(phy->regmap, WIZ_LANEXCTL_STS, mask, val);
/* Enable RX */
mask = RX0_ENABLE_OVL | RX0_ENABLE_MASK;
val = RX0_ENABLE_OVL | (RX0_ENABLE_STATE << RX0_ENABLE_SHIFT);
regmap_update_bits(phy->regmap, WIZ_LANEXCTL_STS, mask, val);
return 0;
}
static int serdes_am654_disable_txrx(struct serdes_am654 *phy)
{
u32 mask;
/* Disable TX */
mask = TX0_ENABLE_OVL | TX0_ENABLE_MASK;
regmap_update_bits(phy->regmap, WIZ_LANEXCTL_STS, mask, 0);
/* Disable RX */
mask = RX0_ENABLE_OVL | RX0_ENABLE_MASK;
regmap_update_bits(phy->regmap, WIZ_LANEXCTL_STS, mask, 0);
return 0;
}
static int serdes_am654_power_on(struct phy *x)
{
struct serdes_am654 *phy = dev_get_priv(x->dev);
int ret;
u32 val;
ret = serdes_am654_enable_pll(phy);
if (ret) {
dev_err(x->dev, "Failed to enable PLL\n");
return ret;
}
ret = serdes_am654_enable_txrx(phy);
if (ret) {
dev_err(x->dev, "Failed to enable TX RX\n");
return ret;
}
return regmap_read_poll_timeout(phy->regmap, COMLANE_R194, val,
val & CMU_OK_I_0, SLEEP_TIME,
PLL_LOCK_TIME);
}
static int serdes_am654_power_off(struct phy *x)
{
struct serdes_am654 *phy = dev_get_priv(x->dev);
serdes_am654_disable_txrx(phy);
serdes_am654_disable_pll(phy);
return 0;
}
static int serdes_am654_init(struct phy *x)
{
struct serdes_am654 *phy = dev_get_priv(x->dev);
u32 mask;
u32 val;
mask = CFG_VERSION_REG_MASK;
val = VERSION << CFG_VERSION_REG_SHIFT;
regmap_update_bits(phy->regmap, COMLANE_R138, mask, val);
val = CMU_MASTER_CDN_O;
regmap_update_bits(phy->regmap, CMU_R07C, val, val);
val = L1_MASTER_CDN_O;
regmap_update_bits(phy->regmap, COMLANE_R190, val, val);
return 0;
}
static int serdes_am654_reset(struct phy *x)
{
struct serdes_am654 *phy = dev_get_priv(x->dev);
u32 val;
val = POR_EN;
regmap_update_bits(phy->regmap, SERDES_CTRL, val, val);
mdelay(1);
regmap_update_bits(phy->regmap, SERDES_CTRL, val, 0);
return 0;
}
static int serdes_am654_of_xlate(struct phy *x,
struct ofnode_phandle_args *args)
{
struct serdes_am654 *phy = dev_get_priv(x->dev);
if (args->args_count != 2) {
dev_err(x->dev, "Invalid DT PHY argument count: %d\n",
args->args_count);
return -EINVAL;
}
if (args->args[0] != PHY_TYPE_PCIE) {
dev_err(x->dev, "Unrecognized PHY type: %d\n",
args->args[0]);
return -EINVAL;
}
x->id = args->args[0] | (args->args[1] << 16);
/* Setup mux mode using second argument */
regmap_update_bits(phy->serdes_ctl, 0, SERDES_CTL_LANE_FUNC_SEL_MASK,
args->args[1]);
return 0;
}
static int serdes_am654_bind(struct udevice *dev)
{
int ret;
ret = device_bind_driver_to_node(dev->parent,
"ti-serdes-am654-mux-clk",
dev_read_name(dev), dev_ofnode(dev),
NULL);
if (ret) {
dev_err(dev, "%s: not able to bind clock driver\n", __func__);
return ret;
}
return 0;
}
static int serdes_am654_probe(struct udevice *dev)
{
struct serdes_am654 *phy = dev_get_priv(dev);
struct power_domain serdes_pwrdmn;
struct regmap *serdes_ctl;
struct regmap *map;
int ret;
ret = regmap_init_mem(dev_ofnode(dev), &map);
if (ret)
return ret;
phy->regmap = map;
serdes_ctl = syscon_regmap_lookup_by_phandle(dev, "ti,serdes-clk");
if (IS_ERR(serdes_ctl)) {
dev_err(dev, "unable to find syscon device\n");
return PTR_ERR(serdes_ctl);
}
phy->serdes_ctl = serdes_ctl;
ret = power_domain_get_by_index(dev, &serdes_pwrdmn, 0);
if (ret) {
dev_err(dev, "failed to get power domain\n");
return ret;
}
ret = power_domain_on(&serdes_pwrdmn);
if (ret) {
dev_err(dev, "Power domain on failed\n");
return ret;
}
return 0;
}
static const struct udevice_id serdes_am654_phy_ids[] = {
{
.compatible = "ti,phy-am654-serdes",
},
};
static const struct phy_ops serdes_am654_phy_ops = {
.reset = serdes_am654_reset,
.init = serdes_am654_init,
.power_on = serdes_am654_power_on,
.power_off = serdes_am654_power_off,
.of_xlate = serdes_am654_of_xlate,
};
U_BOOT_DRIVER(am654_serdes_phy) = {
.name = "am654_serdes_phy",
.id = UCLASS_PHY,
.of_match = serdes_am654_phy_ids,
.bind = serdes_am654_bind,
.ops = &serdes_am654_phy_ops,
.probe = serdes_am654_probe,
.priv_auto = sizeof(struct serdes_am654),
};