// 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/cleanup.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 0 x4
#define CMU_R060 0 x60
#define CMU_R07C 0 x7c
#define CMU_R088 0 x88
#define CMU_R0D0 0 xd0
#define CMU_R0E8 0 xe8
#define LANE_R048 0 x248
#define LANE_R058 0 x258
#define LANE_R06c 0 x26c
#define LANE_R070 0 x270
#define LANE_R19C 0 x39c
#define COMLANE_R004 0 xa04
#define COMLANE_R138 0 xb38
#define VERSION_VAL 0 x70
#define COMLANE_R190 0 xb90
#define COMLANE_R194 0 xb94
#define COMRXEQ_R004 0 x1404
#define COMRXEQ_R008 0 x1408
#define COMRXEQ_R00C 0 x140c
#define COMRXEQ_R014 0 x1414
#define COMRXEQ_R018 0 x1418
#define COMRXEQ_R01C 0 x141c
#define COMRXEQ_R04C 0 x144c
#define COMRXEQ_R088 0 x1488
#define COMRXEQ_R094 0 x1494
#define COMRXEQ_R098 0 x1498
#define SERDES_CTRL 0 x1fd0
#define WIZ_LANEXCTL_STS 0 x1fe0
#define TX0_DISABLE_STATE 0 x4
#define TX0_SLEEP_STATE 0 x5
#define TX0_SNOOZE_STATE 0 x6
#define TX0_ENABLE_STATE 0 x7
#define RX0_DISABLE_STATE 0 x4
#define RX0_SLEEP_STATE 0 x5
#define RX0_SNOOZE_STATE 0 x6
#define RX0_ENABLE_STATE 0 x7
#define WIZ_PLL_CTRL 0 x1ff4
#define PLL_DISABLE_STATE 0 x4
#define PLL_SLEEP_STATE 0 x5
#define PLL_SNOOZE_STATE 0 x6
#define PLL_ENABLE_STATE 0 x7
#define PLL_LOCK_TIME 100000 /* in microseconds */
#define SLEEP_TIME 100 /* in microseconds */
#define LANE_USB3 0 x0
#define LANE_PCIE0_LANE0 0 x1
#define LANE_PCIE1_LANE0 0 x0
#define LANE_PCIE0_LANE1 0 x1
#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 = 0 x1ffc,
};
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(0 x0000, 31 , 24 , 0 x17);
SERDES_AM654_CFG(0 x0004, 15 , 8 , 0 x02);
SERDES_AM654_CFG(0 x0004, 7 , 0 , 0 x0e);
SERDES_AM654_CFG(0 x0008, 23 , 16 , 0 x2e);
SERDES_AM654_CFG(0 x0008, 31 , 24 , 0 x2e);
SERDES_AM654_CFG(0 x0060, 7 , 0 , 0 x4b);
SERDES_AM654_CFG(0 x0060, 15 , 8 , 0 x98);
SERDES_AM654_CFG(0 x0060, 23 , 16 , 0 x60);
SERDES_AM654_CFG(0 x00d0, 31 , 24 , 0 x45);
SERDES_AM654_CFG(0 x00e8, 15 , 8 , 0 x0e);
SERDES_AM654_CFG(0 x0220, 7 , 0 , 0 x34);
SERDES_AM654_CFG(0 x0220, 15 , 8 , 0 x34);
SERDES_AM654_CFG(0 x0220, 31 , 24 , 0 x37);
SERDES_AM654_CFG(0 x0224, 7 , 0 , 0 x37);
SERDES_AM654_CFG(0 x0224, 15 , 8 , 0 x37);
SERDES_AM654_CFG(0 x0228, 23 , 16 , 0 x37);
SERDES_AM654_CFG(0 x0228, 31 , 24 , 0 x37);
SERDES_AM654_CFG(0 x022c, 7 , 0 , 0 x37);
SERDES_AM654_CFG(0 x022c, 15 , 8 , 0 x37);
SERDES_AM654_CFG(0 x0230, 15 , 8 , 0 x2a);
SERDES_AM654_CFG(0 x0230, 23 , 16 , 0 x2a);
SERDES_AM654_CFG(0 x0240, 23 , 16 , 0 x10);
SERDES_AM654_CFG(0 x0240, 31 , 24 , 0 x34);
SERDES_AM654_CFG(0 x0244, 7 , 0 , 0 x40);
SERDES_AM654_CFG(0 x0244, 23 , 16 , 0 x34);
SERDES_AM654_CFG(0 x0248, 15 , 8 , 0 x0d);
SERDES_AM654_CFG(0 x0258, 15 , 8 , 0 x16);
SERDES_AM654_CFG(0 x0258, 23 , 16 , 0 x84);
SERDES_AM654_CFG(0 x0258, 31 , 24 , 0 xf2);
SERDES_AM654_CFG(0 x025c, 7 , 0 , 0 x21);
SERDES_AM654_CFG(0 x0260, 7 , 0 , 0 x27);
SERDES_AM654_CFG(0 x0260, 15 , 8 , 0 x04);
SERDES_AM654_CFG(0 x0268, 15 , 8 , 0 x04);
SERDES_AM654_CFG(0 x0288, 15 , 8 , 0 x2c);
SERDES_AM654_CFG(0 x0330, 31 , 24 , 0 xa0);
SERDES_AM654_CFG(0 x0338, 23 , 16 , 0 x03);
SERDES_AM654_CFG(0 x0338, 31 , 24 , 0 x00);
SERDES_AM654_CFG(0 x033c, 7 , 0 , 0 x00);
SERDES_AM654_CFG(0 x0344, 31 , 24 , 0 x18);
SERDES_AM654_CFG(0 x034c, 7 , 0 , 0 x18);
SERDES_AM654_CFG(0 x039c, 23 , 16 , 0 x3b);
SERDES_AM654_CFG(0 x0a04, 7 , 0 , 0 x03);
SERDES_AM654_CFG(0 x0a14, 31 , 24 , 0 x3c);
SERDES_AM654_CFG(0 x0a18, 15 , 8 , 0 x3c);
SERDES_AM654_CFG(0 x0a38, 7 , 0 , 0 x3e);
SERDES_AM654_CFG(0 x0a38, 15 , 8 , 0 x3e);
SERDES_AM654_CFG(0 x0ae0, 7 , 0 , 0 x07);
SERDES_AM654_CFG(0 x0b6c, 23 , 16 , 0 xcd);
SERDES_AM654_CFG(0 x0b6c, 31 , 24 , 0 x04);
SERDES_AM654_CFG(0 x0b98, 23 , 16 , 0 x03);
SERDES_AM654_CFG(0 x1400, 7 , 0 , 0 x3f);
SERDES_AM654_CFG(0 x1404, 23 , 16 , 0 x6f);
SERDES_AM654_CFG(0 x1404, 31 , 24 , 0 x6f);
SERDES_AM654_CFG(0 x140c, 7 , 0 , 0 x6f);
SERDES_AM654_CFG(0 x140c, 15 , 8 , 0 x6f);
SERDES_AM654_CFG(0 x1410, 15 , 8 , 0 x27);
SERDES_AM654_CFG(0 x1414, 7 , 0 , 0 x0c);
SERDES_AM654_CFG(0 x1414, 23 , 16 , 0 x07);
SERDES_AM654_CFG(0 x1418, 23 , 16 , 0 x40);
SERDES_AM654_CFG(0 x141c, 7 , 0 , 0 x00);
SERDES_AM654_CFG(0 x141c, 15 , 8 , 0 x1f);
SERDES_AM654_CFG(0 x1428, 31 , 24 , 0 x08);
SERDES_AM654_CFG(0 x1434, 31 , 24 , 0 x00);
SERDES_AM654_CFG(0 x1444, 7 , 0 , 0 x94);
SERDES_AM654_CFG(0 x1460, 31 , 24 , 0 x7f);
SERDES_AM654_CFG(0 x1464, 7 , 0 , 0 x43);
SERDES_AM654_CFG(0 x1464, 23 , 16 , 0 x6f);
SERDES_AM654_CFG(0 x1464, 31 , 24 , 0 x43);
SERDES_AM654_CFG(0 x1484, 23 , 16 , 0 x8f);
SERDES_AM654_CFG(0 x1498, 7 , 0 , 0 x4f);
SERDES_AM654_CFG(0 x1498, 23 , 16 , 0 x4f);
SERDES_AM654_CFG(0 x007c, 31 , 24 , 0 x0d);
SERDES_AM654_CFG(0 x0b90, 15 , 8 , 0 x0f);
return 0 ;
}
static int serdes_am654_pcie_init(struct serdes_am654 *phy)
{
int ret = 0 ;
ret |= regmap_field_write(phy->fields[CMU_PLL_CTRL], 0 x2);
ret |= regmap_field_write(phy->fields[AHB_PMA_CM_VCO_VBIAS_VREG], 0 x98);
ret |= regmap_field_write(phy->fields[AHB_PMA_CM_VCO_BIAS_VREG], 0 x98);
ret |= regmap_field_write(phy->fields[AHB_PMA_CM_SR], 0 x45);
ret |= regmap_field_write(phy->fields[AHB_SSC_GEN_Z_O_20_13], 0 xe);
ret |= regmap_field_write(phy->fields[LANE_PLL_CTRL_RXEQ_RXIDLE], 0 x5);
ret |= regmap_field_write(phy->fields[AHB_PMA_LN_AGC_THSEL_VREGH], 0 x83);
ret |= regmap_field_write(phy->fields[AHB_PMA_LN_GEN3_AGC_SD_THSEL], 0 x83);
ret |= regmap_field_write(phy->fields[AHB_PMA_LN_RX_SELR_GEN3], 0 x81);
ret |= regmap_field_write(phy->fields[AHB_PMA_LN_TX_DRV], 0 x3b);
ret |= regmap_field_write(phy->fields[P2S_RBUF_PTR_DIFF], 0 x3);
ret |= regmap_field_write(phy->fields[CONFIG_VERSION], VERSION_VAL);
ret |= regmap_field_write(phy->fields[COMRXEQ_MS_INIT_CTRL_7_0], 0 xf);
ret |= regmap_field_write(phy->fields[COMRXEQ_HS_INIT_CAL_7_0], 0 x4f);
ret |= regmap_field_write(phy->fields[COMRXEQ_MS_RECAL_CTRL_7_0], 0 xf);
ret |= regmap_field_write(phy->fields[COMRXEQ_HS_RECAL_CTRL_7_0], 0 x4f);
ret |= regmap_field_write(phy->fields[COMRXEQ_CSR_ATT_CONFIG], 0 x7);
ret |= regmap_field_write(phy->fields[COMRXEQ_CSR_EBSTADAPT_WIN_LEN], 0 x7f);
ret |= regmap_field_write(phy->fields[COMRXEQ_CTRL_3_4], 0 xf);
ret |= regmap_field_write(phy->fields[COMRXEQ_CTRL_14_15_16], 0 x9a);
ret |= regmap_field_write(phy->fields[COMRXEQ_CSR_DLEV_ERR_THRESH], 0 x32);
ret |= regmap_field_write(phy->fields[COMRXEQ_CTRL_25], 0 x80);
ret |= regmap_field_write(phy->fields[CSR_RXEQ_RATE_CHANGE_CAL_RUN_RATE2_O], 0 xf);
ret |= regmap_field_write(phy->fields[COMRXEQ_HS_RCHANGE_CTRL_7_0], 0 x4f);
ret |= regmap_field_write(phy->fields[CMU_MASTER_CDN], 0 x1);
ret |= regmap_field_write(phy->fields[L1_MASTER_CDN], 0 x2);
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], 0 x1);
mdelay(1 );
ret |= regmap_field_write(phy->fields[POR_EN], 0 x0);
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,
const 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 = {
.determine_rate = __clk_mux_determine_rate,
.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;
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;
mux = devm_kzalloc(dev, sizeof (*mux), GFP_KERNEL);
if (!mux)
return -ENOMEM;
init = &mux->clk_data;
struct device_node *regmap_node __free(device_node) =
of_parse_phandle(node, "ti,serdes-clk" , 0 );
if (!regmap_node)
return dev_err_probe(dev, -ENODEV, "Fail to get serdes-clk node\n" );
regmap = syscon_node_to_regmap(regmap_node->parent);
if (IS_ERR(regmap))
return dev_err_probe(dev, PTR_ERR(regmap),
"Fail to get Syscon regmap\n" );
num_parents = of_clk_get_parent_count(node);
if (num_parents < 2 )
return dev_err_probe(dev, -EINVAL, "SERDES clock must have parents\n" );
parent_names = devm_kzalloc(dev, (sizeof (char *) * num_parents),
GFP_KERNEL);
if (!parent_names)
return -ENOMEM;
of_clk_parent_fill(node, parent_names, num_parents);
addr = of_get_address(regmap_node, 0 , NULL, NULL);
if (!addr)
return -EINVAL;
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))
return PTR_ERR(clk);
am654_phy->clks[clock_num] = clk;
return 0 ;
}
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);
pm_runtime_disable(dev);
return ret;
}
static void 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);
}
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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(vorverarbeitet am 2026-09-28)
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