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kernel/drivers/phy/ti/phy-am654-serdes.c

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// SPDX-License-Identifier: GPL-2.0
/*
* PCIe SERDES driver for AM654x SoC
*
* Copyright (C) 2018 - 2019 Texas Instruments Incorporated - http://www.ti.com/
* Author: Kishon Vijay Abraham I <kishon@ti.com>
*/
#include <dt-bindings/phy/phy.h>
#include <linux/clk.h>
#include <linux/clk-provider.h>
#include <linux/delay.h>
#include <linux/module.h>
#include <linux/mfd/syscon.h>
#include <linux/mux/consumer.h>
#include <linux/of_address.h>
#include <linux/phy/phy.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/regmap.h>
#define CMU_R004 0x4
#define CMU_R060 0x60
#define CMU_R07C 0x7c
#define CMU_R088 0x88
#define CMU_R0D0 0xd0
#define CMU_R0E8 0xe8
#define LANE_R048 0x248
#define LANE_R058 0x258
#define LANE_R06c 0x26c
#define LANE_R070 0x270
#define LANE_R070 0x270
#define LANE_R19C 0x39c
#define COMLANE_R004 0xa04
#define COMLANE_R138 0xb38
#define VERSION_VAL 0x70
#define COMLANE_R190 0xb90
#define COMLANE_R194 0xb94
#define COMRXEQ_R004 0x1404
#define COMRXEQ_R008 0x1408
#define COMRXEQ_R00C 0x140c
#define COMRXEQ_R014 0x1414
#define COMRXEQ_R018 0x1418
#define COMRXEQ_R01C 0x141c
#define COMRXEQ_R04C 0x144c
#define COMRXEQ_R088 0x1488
#define COMRXEQ_R094 0x1494
#define COMRXEQ_R098 0x1498
#define SERDES_CTRL 0x1fd0
#define WIZ_LANEXCTL_STS 0x1fe0
#define TX0_DISABLE_STATE 0x4
#define TX0_SLEEP_STATE 0x5
#define TX0_SNOOZE_STATE 0x6
#define TX0_ENABLE_STATE 0x7
#define RX0_DISABLE_STATE 0x4
#define RX0_SLEEP_STATE 0x5
#define RX0_SNOOZE_STATE 0x6
#define RX0_ENABLE_STATE 0x7
#define WIZ_PLL_CTRL 0x1ff4
#define PLL_DISABLE_STATE 0x4
#define PLL_SLEEP_STATE 0x5
#define PLL_SNOOZE_STATE 0x6
#define PLL_ENABLE_STATE 0x7
#define PLL_LOCK_TIME 100000 /* in microseconds */
#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
#define AM654_SERDES_CTRL_CLKSEL_MASK GENMASK(7, 4)
#define AM654_SERDES_CTRL_CLKSEL_SHIFT 4
struct serdes_am654_clk_mux {
struct clk_hw hw;
struct regmap *regmap;
unsigned int reg;
int clk_id;
struct clk_init_data clk_data;
};
#define to_serdes_am654_clk_mux(_hw) \
container_of(_hw, struct serdes_am654_clk_mux, hw)
static const struct regmap_config serdes_am654_regmap_config = {
.reg_bits = 32,
.val_bits = 32,
.reg_stride = 4,
.fast_io = true,
.max_register = 0x1ffc,
};
enum serdes_am654_fields {
/* CMU PLL Control */
CMU_PLL_CTRL,
LANE_PLL_CTRL_RXEQ_RXIDLE,
/* CMU VCO bias current and VREG setting */
AHB_PMA_CM_VCO_VBIAS_VREG,
AHB_PMA_CM_VCO_BIAS_VREG,
AHB_PMA_CM_SR,
AHB_SSC_GEN_Z_O_20_13,
/* AHB PMA Lane Configuration */
AHB_PMA_LN_AGC_THSEL_VREGH,
/* AGC and Signal detect threshold for Gen3 */
AHB_PMA_LN_GEN3_AGC_SD_THSEL,
AHB_PMA_LN_RX_SELR_GEN3,
AHB_PMA_LN_TX_DRV,
/* CMU Master Reset */
CMU_MASTER_CDN,
/* P2S ring buffer initial startup pointer difference */
P2S_RBUF_PTR_DIFF,
CONFIG_VERSION,
/* Lane 1 Master Reset */
L1_MASTER_CDN,
/* CMU OK Status */
CMU_OK_I_0,
/* Mid-speed initial calibration control */
COMRXEQ_MS_INIT_CTRL_7_0,
/* High-speed initial calibration control */
COMRXEQ_HS_INIT_CAL_7_0,
/* Mid-speed recalibration control */
COMRXEQ_MS_RECAL_CTRL_7_0,
/* High-speed recalibration control */
COMRXEQ_HS_RECAL_CTRL_7_0,
/* ATT configuration */
COMRXEQ_CSR_ATT_CONFIG,
/* Edge based boost adaptation window length */
COMRXEQ_CSR_EBSTADAPT_WIN_LEN,
/* COMRXEQ control 3 & 4 */
COMRXEQ_CTRL_3_4,
/* COMRXEQ control 14, 15 and 16*/
COMRXEQ_CTRL_14_15_16,
/* Threshold for errors in pattern data */
COMRXEQ_CSR_DLEV_ERR_THRESH,
/* COMRXEQ control 25 */
COMRXEQ_CTRL_25,
/* Mid-speed rate change calibration control */
CSR_RXEQ_RATE_CHANGE_CAL_RUN_RATE2_O,
/* High-speed rate change calibration control */
COMRXEQ_HS_RCHANGE_CTRL_7_0,
/* Serdes reset */
POR_EN,
/* Tx Enable Value */
TX0_ENABLE,
/* Rx Enable Value */
RX0_ENABLE,
/* PLL Enable Value */
PLL_ENABLE,
/* PLL ready for use */
PLL_OK,
/* sentinel */
MAX_FIELDS
};
static const struct reg_field serdes_am654_reg_fields[] = {
[CMU_PLL_CTRL] = REG_FIELD(CMU_R004, 8, 15),
[AHB_PMA_CM_VCO_VBIAS_VREG] = REG_FIELD(CMU_R060, 8, 15),
[CMU_MASTER_CDN] = REG_FIELD(CMU_R07C, 24, 31),
[AHB_PMA_CM_VCO_BIAS_VREG] = REG_FIELD(CMU_R088, 24, 31),
[AHB_PMA_CM_SR] = REG_FIELD(CMU_R0D0, 24, 31),
[AHB_SSC_GEN_Z_O_20_13] = REG_FIELD(CMU_R0E8, 8, 15),
[LANE_PLL_CTRL_RXEQ_RXIDLE] = REG_FIELD(LANE_R048, 8, 15),
[AHB_PMA_LN_AGC_THSEL_VREGH] = REG_FIELD(LANE_R058, 16, 23),
[AHB_PMA_LN_GEN3_AGC_SD_THSEL] = REG_FIELD(LANE_R06c, 0, 7),
[AHB_PMA_LN_RX_SELR_GEN3] = REG_FIELD(LANE_R070, 16, 23),
[AHB_PMA_LN_TX_DRV] = REG_FIELD(LANE_R19C, 16, 23),
[P2S_RBUF_PTR_DIFF] = REG_FIELD(COMLANE_R004, 0, 7),
[CONFIG_VERSION] = REG_FIELD(COMLANE_R138, 16, 23),
[L1_MASTER_CDN] = REG_FIELD(COMLANE_R190, 8, 15),
[CMU_OK_I_0] = REG_FIELD(COMLANE_R194, 19, 19),
[COMRXEQ_MS_INIT_CTRL_7_0] = REG_FIELD(COMRXEQ_R004, 24, 31),
[COMRXEQ_HS_INIT_CAL_7_0] = REG_FIELD(COMRXEQ_R008, 0, 7),
[COMRXEQ_MS_RECAL_CTRL_7_0] = REG_FIELD(COMRXEQ_R00C, 8, 15),
[COMRXEQ_HS_RECAL_CTRL_7_0] = REG_FIELD(COMRXEQ_R00C, 16, 23),
[COMRXEQ_CSR_ATT_CONFIG] = REG_FIELD(COMRXEQ_R014, 16, 23),
[COMRXEQ_CSR_EBSTADAPT_WIN_LEN] = REG_FIELD(COMRXEQ_R018, 16, 23),
[COMRXEQ_CTRL_3_4] = REG_FIELD(COMRXEQ_R01C, 8, 15),
[COMRXEQ_CTRL_14_15_16] = REG_FIELD(COMRXEQ_R04C, 0, 7),
[COMRXEQ_CSR_DLEV_ERR_THRESH] = REG_FIELD(COMRXEQ_R088, 16, 23),
[COMRXEQ_CTRL_25] = REG_FIELD(COMRXEQ_R094, 24, 31),
[CSR_RXEQ_RATE_CHANGE_CAL_RUN_RATE2_O] = REG_FIELD(COMRXEQ_R098, 8, 15),
[COMRXEQ_HS_RCHANGE_CTRL_7_0] = REG_FIELD(COMRXEQ_R098, 16, 23),
[POR_EN] = REG_FIELD(SERDES_CTRL, 29, 29),
[TX0_ENABLE] = REG_FIELD(WIZ_LANEXCTL_STS, 29, 31),
[RX0_ENABLE] = REG_FIELD(WIZ_LANEXCTL_STS, 13, 15),
[PLL_ENABLE] = REG_FIELD(WIZ_PLL_CTRL, 29, 31),
[PLL_OK] = REG_FIELD(WIZ_PLL_CTRL, 28, 28),
};
struct serdes_am654 {
struct regmap *regmap;
struct regmap_field *fields[MAX_FIELDS];
struct device *dev;
struct mux_control *control;
bool busy;
u32 type;
struct device_node *of_node;
struct clk_onecell_data clk_data;
struct clk *clks[SERDES_NUM_CLOCKS];
};
static int serdes_am654_enable_pll(struct serdes_am654 *phy)
{
int ret;
u32 val;
ret = regmap_field_write(phy->fields[PLL_ENABLE], PLL_ENABLE_STATE);
if (ret)
return ret;
return regmap_field_read_poll_timeout(phy->fields[PLL_OK], val, val,
1000, PLL_LOCK_TIME);
}
static void serdes_am654_disable_pll(struct serdes_am654 *phy)
{
struct device *dev = phy->dev;
int ret;
ret = regmap_field_write(phy->fields[PLL_ENABLE], PLL_DISABLE_STATE);
if (ret)
dev_err(dev, "Failed to disable PLL\n");
}
static int serdes_am654_enable_txrx(struct serdes_am654 *phy)
{
int ret = 0;
/* Enable TX */
ret |= regmap_field_write(phy->fields[TX0_ENABLE], TX0_ENABLE_STATE);
/* Enable RX */
ret |= regmap_field_write(phy->fields[RX0_ENABLE], RX0_ENABLE_STATE);
if (ret)
return -EIO;
return 0;
}
static int serdes_am654_disable_txrx(struct serdes_am654 *phy)
{
int ret = 0;
/* Disable TX */
ret |= regmap_field_write(phy->fields[TX0_ENABLE], TX0_DISABLE_STATE);
/* Disable RX */
ret |= regmap_field_write(phy->fields[RX0_ENABLE], RX0_DISABLE_STATE);
if (ret)
return -EIO;
return 0;
}
static int serdes_am654_power_on(struct phy *x)
{
struct serdes_am654 *phy = phy_get_drvdata(x);
struct device *dev = phy->dev;
int ret;
u32 val;
ret = serdes_am654_enable_pll(phy);
if (ret) {
dev_err(dev, "Failed to enable PLL\n");
return ret;
}
ret = serdes_am654_enable_txrx(phy);
if (ret) {
dev_err(dev, "Failed to enable TX RX\n");
return ret;
}
return regmap_field_read_poll_timeout(phy->fields[CMU_OK_I_0], val,
val, SLEEP_TIME, PLL_LOCK_TIME);
}
static int serdes_am654_power_off(struct phy *x)
{
struct serdes_am654 *phy = phy_get_drvdata(x);
serdes_am654_disable_txrx(phy);
serdes_am654_disable_pll(phy);
return 0;
}
#define SERDES_AM654_CFG(offset, a, b, val) \
regmap_update_bits(phy->regmap, (offset),\
GENMASK((a), (b)), (val) << (b))
static int serdes_am654_usb3_init(struct serdes_am654 *phy)
{
SERDES_AM654_CFG(0x0000, 31, 24, 0x17);
SERDES_AM654_CFG(0x0004, 15, 8, 0x02);
SERDES_AM654_CFG(0x0004, 7, 0, 0x0e);
SERDES_AM654_CFG(0x0008, 23, 16, 0x2e);
SERDES_AM654_CFG(0x0008, 31, 24, 0x2e);
SERDES_AM654_CFG(0x0060, 7, 0, 0x4b);
SERDES_AM654_CFG(0x0060, 15, 8, 0x98);
SERDES_AM654_CFG(0x0060, 23, 16, 0x60);
SERDES_AM654_CFG(0x00d0, 31, 24, 0x45);
SERDES_AM654_CFG(0x00e8, 15, 8, 0x0e);
SERDES_AM654_CFG(0x0220, 7, 0, 0x34);
SERDES_AM654_CFG(0x0220, 15, 8, 0x34);
SERDES_AM654_CFG(0x0220, 31, 24, 0x37);
SERDES_AM654_CFG(0x0224, 7, 0, 0x37);
SERDES_AM654_CFG(0x0224, 15, 8, 0x37);
SERDES_AM654_CFG(0x0228, 23, 16, 0x37);
SERDES_AM654_CFG(0x0228, 31, 24, 0x37);
SERDES_AM654_CFG(0x022c, 7, 0, 0x37);
SERDES_AM654_CFG(0x022c, 15, 8, 0x37);
SERDES_AM654_CFG(0x0230, 15, 8, 0x2a);
SERDES_AM654_CFG(0x0230, 23, 16, 0x2a);
SERDES_AM654_CFG(0x0240, 23, 16, 0x10);
SERDES_AM654_CFG(0x0240, 31, 24, 0x34);
SERDES_AM654_CFG(0x0244, 7, 0, 0x40);
SERDES_AM654_CFG(0x0244, 23, 16, 0x34);
SERDES_AM654_CFG(0x0248, 15, 8, 0x0d);
SERDES_AM654_CFG(0x0258, 15, 8, 0x16);
SERDES_AM654_CFG(0x0258, 23, 16, 0x84);
SERDES_AM654_CFG(0x0258, 31, 24, 0xf2);
SERDES_AM654_CFG(0x025c, 7, 0, 0x21);
SERDES_AM654_CFG(0x0260, 7, 0, 0x27);
SERDES_AM654_CFG(0x0260, 15, 8, 0x04);
SERDES_AM654_CFG(0x0268, 15, 8, 0x04);
SERDES_AM654_CFG(0x0288, 15, 8, 0x2c);
SERDES_AM654_CFG(0x0330, 31, 24, 0xa0);
SERDES_AM654_CFG(0x0338, 23, 16, 0x03);
SERDES_AM654_CFG(0x0338, 31, 24, 0x00);
SERDES_AM654_CFG(0x033c, 7, 0, 0x00);
SERDES_AM654_CFG(0x0344, 31, 24, 0x18);
SERDES_AM654_CFG(0x034c, 7, 0, 0x18);
SERDES_AM654_CFG(0x039c, 23, 16, 0x3b);
SERDES_AM654_CFG(0x0a04, 7, 0, 0x03);
SERDES_AM654_CFG(0x0a14, 31, 24, 0x3c);
SERDES_AM654_CFG(0x0a18, 15, 8, 0x3c);
SERDES_AM654_CFG(0x0a38, 7, 0, 0x3e);
SERDES_AM654_CFG(0x0a38, 15, 8, 0x3e);
SERDES_AM654_CFG(0x0ae0, 7, 0, 0x07);
SERDES_AM654_CFG(0x0b6c, 23, 16, 0xcd);
SERDES_AM654_CFG(0x0b6c, 31, 24, 0x04);
SERDES_AM654_CFG(0x0b98, 23, 16, 0x03);
SERDES_AM654_CFG(0x1400, 7, 0, 0x3f);
SERDES_AM654_CFG(0x1404, 23, 16, 0x6f);
SERDES_AM654_CFG(0x1404, 31, 24, 0x6f);
SERDES_AM654_CFG(0x140c, 7, 0, 0x6f);
SERDES_AM654_CFG(0x140c, 15, 8, 0x6f);
SERDES_AM654_CFG(0x1410, 15, 8, 0x27);
SERDES_AM654_CFG(0x1414, 7, 0, 0x0c);
SERDES_AM654_CFG(0x1414, 23, 16, 0x07);
SERDES_AM654_CFG(0x1418, 23, 16, 0x40);
SERDES_AM654_CFG(0x141c, 7, 0, 0x00);
SERDES_AM654_CFG(0x141c, 15, 8, 0x1f);
SERDES_AM654_CFG(0x1428, 31, 24, 0x08);
SERDES_AM654_CFG(0x1434, 31, 24, 0x00);
SERDES_AM654_CFG(0x1444, 7, 0, 0x94);
SERDES_AM654_CFG(0x1460, 31, 24, 0x7f);
SERDES_AM654_CFG(0x1464, 7, 0, 0x43);
SERDES_AM654_CFG(0x1464, 23, 16, 0x6f);
SERDES_AM654_CFG(0x1464, 31, 24, 0x43);
SERDES_AM654_CFG(0x1484, 23, 16, 0x8f);
SERDES_AM654_CFG(0x1498, 7, 0, 0x4f);
SERDES_AM654_CFG(0x1498, 23, 16, 0x4f);
SERDES_AM654_CFG(0x007c, 31, 24, 0x0d);
SERDES_AM654_CFG(0x0b90, 15, 8, 0x0f);
return 0;
}
static int serdes_am654_pcie_init(struct serdes_am654 *phy)
{
int ret = 0;
ret |= regmap_field_write(phy->fields[CMU_PLL_CTRL], 0x2);
ret |= regmap_field_write(phy->fields[AHB_PMA_CM_VCO_VBIAS_VREG], 0x98);
ret |= regmap_field_write(phy->fields[AHB_PMA_CM_VCO_BIAS_VREG], 0x98);
ret |= regmap_field_write(phy->fields[AHB_PMA_CM_SR], 0x45);
ret |= regmap_field_write(phy->fields[AHB_SSC_GEN_Z_O_20_13], 0xe);
ret |= regmap_field_write(phy->fields[LANE_PLL_CTRL_RXEQ_RXIDLE], 0x5);
ret |= regmap_field_write(phy->fields[AHB_PMA_LN_AGC_THSEL_VREGH], 0x83);
ret |= regmap_field_write(phy->fields[AHB_PMA_LN_GEN3_AGC_SD_THSEL], 0x83);
ret |= regmap_field_write(phy->fields[AHB_PMA_LN_RX_SELR_GEN3], 0x81);
ret |= regmap_field_write(phy->fields[AHB_PMA_LN_TX_DRV], 0x3b);
ret |= regmap_field_write(phy->fields[P2S_RBUF_PTR_DIFF], 0x3);
ret |= regmap_field_write(phy->fields[CONFIG_VERSION], VERSION_VAL);
ret |= regmap_field_write(phy->fields[COMRXEQ_MS_INIT_CTRL_7_0], 0xf);
ret |= regmap_field_write(phy->fields[COMRXEQ_HS_INIT_CAL_7_0], 0x4f);
ret |= regmap_field_write(phy->fields[COMRXEQ_MS_RECAL_CTRL_7_0], 0xf);
ret |= regmap_field_write(phy->fields[COMRXEQ_HS_RECAL_CTRL_7_0], 0x4f);
ret |= regmap_field_write(phy->fields[COMRXEQ_CSR_ATT_CONFIG], 0x7);
ret |= regmap_field_write(phy->fields[COMRXEQ_CSR_EBSTADAPT_WIN_LEN], 0x7f);
ret |= regmap_field_write(phy->fields[COMRXEQ_CTRL_3_4], 0xf);
ret |= regmap_field_write(phy->fields[COMRXEQ_CTRL_14_15_16], 0x9a);
ret |= regmap_field_write(phy->fields[COMRXEQ_CSR_DLEV_ERR_THRESH], 0x32);
ret |= regmap_field_write(phy->fields[COMRXEQ_CTRL_25], 0x80);
ret |= regmap_field_write(phy->fields[CSR_RXEQ_RATE_CHANGE_CAL_RUN_RATE2_O], 0xf);
ret |= regmap_field_write(phy->fields[COMRXEQ_HS_RCHANGE_CTRL_7_0], 0x4f);
ret |= regmap_field_write(phy->fields[CMU_MASTER_CDN], 0x1);
ret |= regmap_field_write(phy->fields[L1_MASTER_CDN], 0x2);
if (ret)
return -EIO;
return 0;
}
static int serdes_am654_init(struct phy *x)
{
struct serdes_am654 *phy = phy_get_drvdata(x);
switch (phy->type) {
case PHY_TYPE_PCIE:
return serdes_am654_pcie_init(phy);
case PHY_TYPE_USB3:
return serdes_am654_usb3_init(phy);
default:
return -EINVAL;
}
}
static int serdes_am654_reset(struct phy *x)
{
struct serdes_am654 *phy = phy_get_drvdata(x);
int ret = 0;
serdes_am654_disable_pll(phy);
serdes_am654_disable_txrx(phy);
ret |= regmap_field_write(phy->fields[POR_EN], 0x1);
mdelay(1);
ret |= regmap_field_write(phy->fields[POR_EN], 0x0);
if (ret)
return -EIO;
return 0;
}
static void serdes_am654_release(struct phy *x)
{
struct serdes_am654 *phy = phy_get_drvdata(x);
phy->type = PHY_NONE;
phy->busy = false;
mux_control_deselect(phy->control);
}
static struct phy *serdes_am654_xlate(struct device *dev,
struct of_phandle_args *args)
{
struct serdes_am654 *am654_phy;
struct phy *phy;
int ret;
phy = of_phy_simple_xlate(dev, args);
if (IS_ERR(phy))
return phy;
am654_phy = phy_get_drvdata(phy);
if (am654_phy->busy)
return ERR_PTR(-EBUSY);
ret = mux_control_select(am654_phy->control, args->args[1]);
if (ret) {
dev_err(dev, "Failed to select SERDES Lane Function\n");
return ERR_PTR(ret);
}
am654_phy->busy = true;
am654_phy->type = args->args[0];
return phy;
}
static const struct phy_ops ops = {
.reset = serdes_am654_reset,
.init = serdes_am654_init,
.power_on = serdes_am654_power_on,
.power_off = serdes_am654_power_off,
.release = serdes_am654_release,
.owner = THIS_MODULE,
};
#define SERDES_NUM_MUX_COMBINATIONS 16
#define LICLK 0
#define EXT_REFCLK 1
#define RICLK 2
static const int
serdes_am654_mux_table[SERDES_NUM_MUX_COMBINATIONS][SERDES_NUM_CLOCKS] = {
/*
* Each combination maps to one of
* "Figure 12-1986. SerDes Reference Clock Distribution"
* in TRM.
*/
/* Parent of CMU refclk, Left output, Right output
* either of EXT_REFCLK, LICLK, RICLK
*/
{ EXT_REFCLK, EXT_REFCLK, EXT_REFCLK }, /* 0000 */
{ RICLK, EXT_REFCLK, EXT_REFCLK }, /* 0001 */
{ EXT_REFCLK, RICLK, LICLK }, /* 0010 */
{ RICLK, RICLK, EXT_REFCLK }, /* 0011 */
{ LICLK, EXT_REFCLK, EXT_REFCLK }, /* 0100 */
{ EXT_REFCLK, EXT_REFCLK, EXT_REFCLK }, /* 0101 */
{ LICLK, RICLK, LICLK }, /* 0110 */
{ EXT_REFCLK, RICLK, LICLK }, /* 0111 */
{ EXT_REFCLK, EXT_REFCLK, LICLK }, /* 1000 */
{ RICLK, EXT_REFCLK, LICLK }, /* 1001 */
{ EXT_REFCLK, RICLK, EXT_REFCLK }, /* 1010 */
{ RICLK, RICLK, EXT_REFCLK }, /* 1011 */
{ LICLK, EXT_REFCLK, LICLK }, /* 1100 */
{ EXT_REFCLK, EXT_REFCLK, LICLK }, /* 1101 */
{ LICLK, RICLK, EXT_REFCLK }, /* 1110 */
{ EXT_REFCLK, RICLK, EXT_REFCLK }, /* 1111 */
};
static u8 serdes_am654_clk_mux_get_parent(struct clk_hw *hw)
{
struct serdes_am654_clk_mux *mux = to_serdes_am654_clk_mux(hw);
struct regmap *regmap = mux->regmap;
unsigned int reg = mux->reg;
unsigned int val;
regmap_read(regmap, reg, &val);
val &= AM654_SERDES_CTRL_CLKSEL_MASK;
val >>= AM654_SERDES_CTRL_CLKSEL_SHIFT;
return serdes_am654_mux_table[val][mux->clk_id];
}
static int serdes_am654_clk_mux_set_parent(struct clk_hw *hw, u8 index)
{
struct serdes_am654_clk_mux *mux = to_serdes_am654_clk_mux(hw);
struct regmap *regmap = mux->regmap;
const char *name = clk_hw_get_name(hw);
unsigned int reg = mux->reg;
int clk_id = mux->clk_id;
int parents[SERDES_NUM_CLOCKS];
const int *p;
u32 val;
int found, i;
int ret;
/* get existing setting */
regmap_read(regmap, reg, &val);
val &= AM654_SERDES_CTRL_CLKSEL_MASK;
val >>= AM654_SERDES_CTRL_CLKSEL_SHIFT;
for (i = 0; i < SERDES_NUM_CLOCKS; i++)
parents[i] = serdes_am654_mux_table[val][i];
/* change parent of this clock. others left intact */
parents[clk_id] = index;
/* Find the match */
for (val = 0; val < SERDES_NUM_MUX_COMBINATIONS; val++) {
p = serdes_am654_mux_table[val];
found = 1;
for (i = 0; i < SERDES_NUM_CLOCKS; i++) {
if (parents[i] != p[i]) {
found = 0;
break;
}
}
if (found)
break;
}
if (!found) {
/*
* This can never happen, unless we missed
* a valid combination in serdes_am654_mux_table.
*/
WARN(1, "Failed to find the parent of %s clock\n", name);
return -EINVAL;
}
val <<= AM654_SERDES_CTRL_CLKSEL_SHIFT;
ret = regmap_update_bits(regmap, reg, AM654_SERDES_CTRL_CLKSEL_MASK,
val);
return ret;
}
static const struct clk_ops serdes_am654_clk_mux_ops = {
.set_parent = serdes_am654_clk_mux_set_parent,
.get_parent = serdes_am654_clk_mux_get_parent,
};
static int serdes_am654_clk_register(struct serdes_am654 *am654_phy,
const char *clock_name, int clock_num)
{
struct device_node *node = am654_phy->of_node;
struct device *dev = am654_phy->dev;
struct serdes_am654_clk_mux *mux;
struct device_node *regmap_node;
const char **parent_names;
struct clk_init_data *init;
unsigned int num_parents;
struct regmap *regmap;
const __be32 *addr;
unsigned int reg;
struct clk *clk;
int ret = 0;
mux = devm_kzalloc(dev, sizeof(*mux), GFP_KERNEL);
if (!mux)
return -ENOMEM;
init = &mux->clk_data;
regmap_node = of_parse_phandle(node, "ti,serdes-clk", 0);
if (!regmap_node) {
dev_err(dev, "Fail to get serdes-clk node\n");
ret = -ENODEV;
goto out_put_node;
}
regmap = syscon_node_to_regmap(regmap_node->parent);
if (IS_ERR(regmap)) {
dev_err(dev, "Fail to get Syscon regmap\n");
ret = PTR_ERR(regmap);
goto out_put_node;
}
num_parents = of_clk_get_parent_count(node);
if (num_parents < 2) {
dev_err(dev, "SERDES clock must have parents\n");
ret = -EINVAL;
goto out_put_node;
}
parent_names = devm_kzalloc(dev, (sizeof(char *) * num_parents),
GFP_KERNEL);
if (!parent_names) {
ret = -ENOMEM;
goto out_put_node;
}
of_clk_parent_fill(node, parent_names, num_parents);
addr = of_get_address(regmap_node, 0, NULL, NULL);
if (!addr) {
ret = -EINVAL;
goto out_put_node;
}
reg = be32_to_cpu(*addr);
init->ops = &serdes_am654_clk_mux_ops;
init->flags = CLK_SET_RATE_NO_REPARENT;
init->parent_names = parent_names;
init->num_parents = num_parents;
init->name = clock_name;
mux->regmap = regmap;
mux->reg = reg;
mux->clk_id = clock_num;
mux->hw.init = init;
clk = devm_clk_register(dev, &mux->hw);
if (IS_ERR(clk)) {
ret = PTR_ERR(clk);
goto out_put_node;
}
am654_phy->clks[clock_num] = clk;
out_put_node:
of_node_put(regmap_node);
return ret;
}
static const struct of_device_id serdes_am654_id_table[] = {
{
.compatible = "ti,phy-am654-serdes",
},
{}
};
MODULE_DEVICE_TABLE(of, serdes_am654_id_table);
static int serdes_am654_regfield_init(struct serdes_am654 *am654_phy)
{
struct regmap *regmap = am654_phy->regmap;
struct device *dev = am654_phy->dev;
int i;
for (i = 0; i < MAX_FIELDS; i++) {
am654_phy->fields[i] = devm_regmap_field_alloc(dev,
regmap,
serdes_am654_reg_fields[i]);
if (IS_ERR(am654_phy->fields[i])) {
dev_err(dev, "Unable to allocate regmap field %d\n", i);
return PTR_ERR(am654_phy->fields[i]);
}
}
return 0;
}
static int serdes_am654_probe(struct platform_device *pdev)
{
struct phy_provider *phy_provider;
struct device *dev = &pdev->dev;
struct device_node *node = dev->of_node;
struct clk_onecell_data *clk_data;
struct serdes_am654 *am654_phy;
struct mux_control *control;
const char *clock_name;
struct regmap *regmap;
void __iomem *base;
struct phy *phy;
int ret;
int i;
am654_phy = devm_kzalloc(dev, sizeof(*am654_phy), GFP_KERNEL);
if (!am654_phy)
return -ENOMEM;
base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(base))
return PTR_ERR(base);
regmap = devm_regmap_init_mmio(dev, base, &serdes_am654_regmap_config);
if (IS_ERR(regmap)) {
dev_err(dev, "Failed to initialize regmap\n");
return PTR_ERR(regmap);
}
control = devm_mux_control_get(dev, NULL);
if (IS_ERR(control))
return PTR_ERR(control);
am654_phy->dev = dev;
am654_phy->of_node = node;
am654_phy->regmap = regmap;
am654_phy->control = control;
am654_phy->type = PHY_NONE;
ret = serdes_am654_regfield_init(am654_phy);
if (ret) {
dev_err(dev, "Failed to initialize regfields\n");
return ret;
}
platform_set_drvdata(pdev, am654_phy);
for (i = 0; i < SERDES_NUM_CLOCKS; i++) {
ret = of_property_read_string_index(node, "clock-output-names",
i, &clock_name);
if (ret) {
dev_err(dev, "Failed to get clock name\n");
return ret;
}
ret = serdes_am654_clk_register(am654_phy, clock_name, i);
if (ret) {
dev_err(dev, "Failed to initialize clock %s\n",
clock_name);
return ret;
}
}
clk_data = &am654_phy->clk_data;
clk_data->clks = am654_phy->clks;
clk_data->clk_num = SERDES_NUM_CLOCKS;
ret = of_clk_add_provider(node, of_clk_src_onecell_get, clk_data);
if (ret)
return ret;
pm_runtime_enable(dev);
phy = devm_phy_create(dev, NULL, &ops);
if (IS_ERR(phy)) {
ret = PTR_ERR(phy);
goto clk_err;
}
phy_set_drvdata(phy, am654_phy);
phy_provider = devm_of_phy_provider_register(dev, serdes_am654_xlate);
if (IS_ERR(phy_provider)) {
ret = PTR_ERR(phy_provider);
goto clk_err;
}
return 0;
clk_err:
of_clk_del_provider(node);
return ret;
}
static int serdes_am654_remove(struct platform_device *pdev)
{
struct serdes_am654 *am654_phy = platform_get_drvdata(pdev);
struct device_node *node = am654_phy->of_node;
pm_runtime_disable(&pdev->dev);
of_clk_del_provider(node);
return 0;
}
static struct platform_driver serdes_am654_driver = {
.probe = serdes_am654_probe,
.remove = serdes_am654_remove,
.driver = {
.name = "phy-am654",
.of_match_table = serdes_am654_id_table,
},
};
module_platform_driver(serdes_am654_driver);
MODULE_AUTHOR("Texas Instruments Inc.");
MODULE_DESCRIPTION("TI AM654x SERDES driver");
MODULE_LICENSE("GPL v2");
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