linux/drivers/phy/phy-miphy365x.c

637 lines
16 KiB
C
Raw Blame History

This file contains ambiguous Unicode characters

This file contains Unicode characters that might be confused with other characters. If you think that this is intentional, you can safely ignore this warning. Use the Escape button to reveal them.

/*
* Copyright (C) 2014 STMicroelectronics All Rights Reserved
*
* STMicroelectronics PHY driver MiPHY365 (for SoC STiH416).
*
* Authors: Alexandre Torgue <alexandre.torgue@st.com>
* Lee Jones <lee.jones@linaro.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2, as
* published by the Free Software Foundation.
*
*/
#include <linux/platform_device.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/of_address.h>
#include <linux/clk.h>
#include <linux/phy/phy.h>
#include <linux/delay.h>
#include <linux/mfd/syscon.h>
#include <linux/regmap.h>
#include <dt-bindings/phy/phy-miphy365x.h>
#define HFC_TIMEOUT 100
#define SYSCFG_SELECT_SATA_MASK BIT(1)
#define SYSCFG_SELECT_SATA_POS 1
/* MiPHY365x register definitions */
#define RESET_REG 0x00
#define RST_PLL BIT(1)
#define RST_PLL_CAL BIT(2)
#define RST_RX BIT(4)
#define RST_MACRO BIT(7)
#define STATUS_REG 0x01
#define IDLL_RDY BIT(0)
#define PLL_RDY BIT(1)
#define DES_BIT_LOCK BIT(2)
#define DES_SYMBOL_LOCK BIT(3)
#define CTRL_REG 0x02
#define TERM_EN BIT(0)
#define PCI_EN BIT(2)
#define DES_BIT_LOCK_EN BIT(3)
#define TX_POL BIT(5)
#define INT_CTRL_REG 0x03
#define BOUNDARY1_REG 0x10
#define SPDSEL_SEL BIT(0)
#define BOUNDARY3_REG 0x12
#define TX_SPDSEL_GEN1_VAL 0
#define TX_SPDSEL_GEN2_VAL 0x01
#define TX_SPDSEL_GEN3_VAL 0x02
#define RX_SPDSEL_GEN1_VAL 0
#define RX_SPDSEL_GEN2_VAL (0x01 << 3)
#define RX_SPDSEL_GEN3_VAL (0x02 << 3)
#define PCIE_REG 0x16
#define BUF_SEL_REG 0x20
#define CONF_GEN_SEL_GEN3 0x02
#define CONF_GEN_SEL_GEN2 0x01
#define PD_VDDTFILTER BIT(4)
#define TXBUF1_REG 0x21
#define SWING_VAL 0x04
#define SWING_VAL_GEN1 0x03
#define PREEMPH_VAL (0x3 << 5)
#define TXBUF2_REG 0x22
#define TXSLEW_VAL 0x2
#define TXSLEW_VAL_GEN1 0x4
#define RXBUF_OFFSET_CTRL_REG 0x23
#define RXBUF_REG 0x25
#define SDTHRES_VAL 0x01
#define EQ_ON3 (0x03 << 4)
#define EQ_ON1 (0x01 << 4)
#define COMP_CTRL1_REG 0x40
#define START_COMSR BIT(0)
#define START_COMZC BIT(1)
#define COMSR_DONE BIT(2)
#define COMZC_DONE BIT(3)
#define COMP_AUTO_LOAD BIT(4)
#define COMP_CTRL2_REG 0x41
#define COMP_2MHZ_RAT_GEN1 0x1e
#define COMP_2MHZ_RAT 0xf
#define COMP_CTRL3_REG 0x42
#define COMSR_COMP_REF 0x33
#define COMP_IDLL_REG 0x47
#define COMZC_IDLL 0x2a
#define PLL_CTRL1_REG 0x50
#define PLL_START_CAL BIT(0)
#define BUF_EN BIT(2)
#define SYNCHRO_TX BIT(3)
#define SSC_EN BIT(6)
#define CONFIG_PLL BIT(7)
#define PLL_CTRL2_REG 0x51
#define BYPASS_PLL_CAL BIT(1)
#define PLL_RAT_REG 0x52
#define PLL_SSC_STEP_MSB_REG 0x56
#define PLL_SSC_STEP_MSB_VAL 0x03
#define PLL_SSC_STEP_LSB_REG 0x57
#define PLL_SSC_STEP_LSB_VAL 0x63
#define PLL_SSC_PER_MSB_REG 0x58
#define PLL_SSC_PER_MSB_VAL 0
#define PLL_SSC_PER_LSB_REG 0x59
#define PLL_SSC_PER_LSB_VAL 0xf1
#define IDLL_TEST_REG 0x72
#define START_CLK_HF BIT(6)
#define DES_BITLOCK_REG 0x86
#define BIT_LOCK_LEVEL 0x01
#define BIT_LOCK_CNT_512 (0x03 << 5)
struct miphy365x_phy {
struct phy *phy;
void __iomem *base;
bool pcie_tx_pol_inv;
bool sata_tx_pol_inv;
u32 sata_gen;
u64 ctrlreg;
u8 type;
};
struct miphy365x_dev {
struct device *dev;
struct regmap *regmap;
struct mutex miphy_mutex;
struct miphy365x_phy **phys;
};
/*
* These values are represented in Device tree. They are considered to be ABI
* and although they can be extended any existing values must not change.
*/
enum miphy_sata_gen {
SATA_GEN1 = 1,
SATA_GEN2,
SATA_GEN3
};
static u8 rx_tx_spd[] = {
TX_SPDSEL_GEN1_VAL | RX_SPDSEL_GEN1_VAL,
TX_SPDSEL_GEN2_VAL | RX_SPDSEL_GEN2_VAL,
TX_SPDSEL_GEN3_VAL | RX_SPDSEL_GEN3_VAL
};
/*
* This function selects the system configuration,
* either two SATA, one SATA and one PCIe, or two PCIe lanes.
*/
static int miphy365x_set_path(struct miphy365x_phy *miphy_phy,
struct miphy365x_dev *miphy_dev)
{
bool sata = (miphy_phy->type == MIPHY_TYPE_SATA);
return regmap_update_bits(miphy_dev->regmap,
(unsigned int)miphy_phy->ctrlreg,
SYSCFG_SELECT_SATA_MASK,
sata << SYSCFG_SELECT_SATA_POS);
}
static int miphy365x_init_pcie_port(struct miphy365x_phy *miphy_phy,
struct miphy365x_dev *miphy_dev)
{
u8 val;
if (miphy_phy->pcie_tx_pol_inv) {
/* Invert Tx polarity and clear pci_txdetect_pol bit */
val = TERM_EN | PCI_EN | DES_BIT_LOCK_EN | TX_POL;
writeb_relaxed(val, miphy_phy->base + CTRL_REG);
writeb_relaxed(0x00, miphy_phy->base + PCIE_REG);
}
return 0;
}
static inline int miphy365x_hfc_not_rdy(struct miphy365x_phy *miphy_phy,
struct miphy365x_dev *miphy_dev)
{
unsigned long timeout = jiffies + msecs_to_jiffies(HFC_TIMEOUT);
u8 mask = IDLL_RDY | PLL_RDY;
u8 regval;
do {
regval = readb_relaxed(miphy_phy->base + STATUS_REG);
if (!(regval & mask))
return 0;
usleep_range(2000, 2500);
} while (time_before(jiffies, timeout));
dev_err(miphy_dev->dev, "HFC ready timeout!\n");
return -EBUSY;
}
static inline int miphy365x_rdy(struct miphy365x_phy *miphy_phy,
struct miphy365x_dev *miphy_dev)
{
unsigned long timeout = jiffies + msecs_to_jiffies(HFC_TIMEOUT);
u8 mask = IDLL_RDY | PLL_RDY;
u8 regval;
do {
regval = readb_relaxed(miphy_phy->base + STATUS_REG);
if ((regval & mask) == mask)
return 0;
usleep_range(2000, 2500);
} while (time_before(jiffies, timeout));
dev_err(miphy_dev->dev, "PHY not ready timeout!\n");
return -EBUSY;
}
static inline void miphy365x_set_comp(struct miphy365x_phy *miphy_phy,
struct miphy365x_dev *miphy_dev)
{
u8 val, mask;
if (miphy_phy->sata_gen == SATA_GEN1)
writeb_relaxed(COMP_2MHZ_RAT_GEN1,
miphy_phy->base + COMP_CTRL2_REG);
else
writeb_relaxed(COMP_2MHZ_RAT,
miphy_phy->base + COMP_CTRL2_REG);
if (miphy_phy->sata_gen != SATA_GEN3) {
writeb_relaxed(COMSR_COMP_REF,
miphy_phy->base + COMP_CTRL3_REG);
/*
* Force VCO current to value defined by address 0x5A
* and disable PCIe100Mref bit
* Enable auto load compensation for pll_i_bias
*/
writeb_relaxed(BYPASS_PLL_CAL, miphy_phy->base + PLL_CTRL2_REG);
writeb_relaxed(COMZC_IDLL, miphy_phy->base + COMP_IDLL_REG);
}
/*
* Force restart compensation and enable auto load
* for Comzc_Tx, Comzc_Rx and Comsr on macro
*/
val = START_COMSR | START_COMZC | COMP_AUTO_LOAD;
writeb_relaxed(val, miphy_phy->base + COMP_CTRL1_REG);
mask = COMSR_DONE | COMZC_DONE;
while ((readb_relaxed(miphy_phy->base + COMP_CTRL1_REG) & mask) != mask)
cpu_relax();
}
static inline void miphy365x_set_ssc(struct miphy365x_phy *miphy_phy,
struct miphy365x_dev *miphy_dev)
{
u8 val;
/*
* SSC Settings. SSC will be enabled through Link
* SSC Ampl. = 0.4%
* SSC Freq = 31KHz
*/
writeb_relaxed(PLL_SSC_STEP_MSB_VAL,
miphy_phy->base + PLL_SSC_STEP_MSB_REG);
writeb_relaxed(PLL_SSC_STEP_LSB_VAL,
miphy_phy->base + PLL_SSC_STEP_LSB_REG);
writeb_relaxed(PLL_SSC_PER_MSB_VAL,
miphy_phy->base + PLL_SSC_PER_MSB_REG);
writeb_relaxed(PLL_SSC_PER_LSB_VAL,
miphy_phy->base + PLL_SSC_PER_LSB_REG);
/* SSC Settings complete */
if (miphy_phy->sata_gen == SATA_GEN1) {
val = PLL_START_CAL | BUF_EN | SYNCHRO_TX | CONFIG_PLL;
writeb_relaxed(val, miphy_phy->base + PLL_CTRL1_REG);
} else {
val = SSC_EN | PLL_START_CAL | BUF_EN | SYNCHRO_TX | CONFIG_PLL;
writeb_relaxed(val, miphy_phy->base + PLL_CTRL1_REG);
}
}
static int miphy365x_init_sata_port(struct miphy365x_phy *miphy_phy,
struct miphy365x_dev *miphy_dev)
{
int ret;
u8 val;
/*
* Force PHY macro reset, PLL calibration reset, PLL reset
* and assert Deserializer Reset
*/
val = RST_PLL | RST_PLL_CAL | RST_RX | RST_MACRO;
writeb_relaxed(val, miphy_phy->base + RESET_REG);
if (miphy_phy->sata_tx_pol_inv)
writeb_relaxed(TX_POL, miphy_phy->base + CTRL_REG);
/*
* Force macro1 to use rx_lspd, tx_lspd
* Force Rx_Clock on first I-DLL phase
* Force Des in HP mode on macro, rx_lspd, tx_lspd for Gen2/3
*/
writeb_relaxed(SPDSEL_SEL, miphy_phy->base + BOUNDARY1_REG);
writeb_relaxed(START_CLK_HF, miphy_phy->base + IDLL_TEST_REG);
val = rx_tx_spd[miphy_phy->sata_gen];
writeb_relaxed(val, miphy_phy->base + BOUNDARY3_REG);
/* Wait for HFC_READY = 0 */
ret = miphy365x_hfc_not_rdy(miphy_phy, miphy_dev);
if (ret)
return ret;
/* Compensation Recalibration */
miphy365x_set_comp(miphy_phy, miphy_dev);
switch (miphy_phy->sata_gen) {
case SATA_GEN3:
/*
* TX Swing target 550-600mv peak to peak diff
* Tx Slew target 90-110ps rising/falling time
* Rx Eq ON3, Sigdet threshold SDTH1
*/
val = PD_VDDTFILTER | CONF_GEN_SEL_GEN3;
writeb_relaxed(val, miphy_phy->base + BUF_SEL_REG);
val = SWING_VAL | PREEMPH_VAL;
writeb_relaxed(val, miphy_phy->base + TXBUF1_REG);
writeb_relaxed(TXSLEW_VAL, miphy_phy->base + TXBUF2_REG);
writeb_relaxed(0x00, miphy_phy->base + RXBUF_OFFSET_CTRL_REG);
val = SDTHRES_VAL | EQ_ON3;
writeb_relaxed(val, miphy_phy->base + RXBUF_REG);
break;
case SATA_GEN2:
/*
* conf gen sel=0x1 to program Gen2 banked registers
* VDDT filter ON
* Tx Swing target 550-600mV peak-to-peak diff
* Tx Slew target 90-110 ps rising/falling time
* RX Equalization ON1, Sigdet threshold SDTH1
*/
writeb_relaxed(CONF_GEN_SEL_GEN2,
miphy_phy->base + BUF_SEL_REG);
writeb_relaxed(SWING_VAL, miphy_phy->base + TXBUF1_REG);
writeb_relaxed(TXSLEW_VAL, miphy_phy->base + TXBUF2_REG);
val = SDTHRES_VAL | EQ_ON1;
writeb_relaxed(val, miphy_phy->base + RXBUF_REG);
break;
case SATA_GEN1:
/*
* conf gen sel = 00b to program Gen1 banked registers
* VDDT filter ON
* Tx Swing target 500-550mV peak-to-peak diff
* Tx Slew target120-140 ps rising/falling time
*/
writeb_relaxed(PD_VDDTFILTER, miphy_phy->base + BUF_SEL_REG);
writeb_relaxed(SWING_VAL_GEN1, miphy_phy->base + TXBUF1_REG);
writeb_relaxed(TXSLEW_VAL_GEN1, miphy_phy->base + TXBUF2_REG);
break;
default:
break;
}
/* Force Macro1 in partial mode & release pll cal reset */
writeb_relaxed(RST_RX, miphy_phy->base + RESET_REG);
usleep_range(100, 150);
miphy365x_set_ssc(miphy_phy, miphy_dev);
/* Wait for phy_ready */
ret = miphy365x_rdy(miphy_phy, miphy_dev);
if (ret)
return ret;
/*
* Enable macro1 to use rx_lspd & tx_lspd
* Release Rx_Clock on first I-DLL phase on macro1
* Assert deserializer reset
* des_bit_lock_en is set
* bit lock detection strength
* Deassert deserializer reset
*/
writeb_relaxed(0x00, miphy_phy->base + BOUNDARY1_REG);
writeb_relaxed(0x00, miphy_phy->base + IDLL_TEST_REG);
writeb_relaxed(RST_RX, miphy_phy->base + RESET_REG);
val = miphy_phy->sata_tx_pol_inv ?
(TX_POL | DES_BIT_LOCK_EN) : DES_BIT_LOCK_EN;
writeb_relaxed(val, miphy_phy->base + CTRL_REG);
val = BIT_LOCK_CNT_512 | BIT_LOCK_LEVEL;
writeb_relaxed(val, miphy_phy->base + DES_BITLOCK_REG);
writeb_relaxed(0x00, miphy_phy->base + RESET_REG);
return 0;
}
static int miphy365x_init(struct phy *phy)
{
struct miphy365x_phy *miphy_phy = phy_get_drvdata(phy);
struct miphy365x_dev *miphy_dev = dev_get_drvdata(phy->dev.parent);
int ret = 0;
mutex_lock(&miphy_dev->miphy_mutex);
ret = miphy365x_set_path(miphy_phy, miphy_dev);
if (ret) {
mutex_unlock(&miphy_dev->miphy_mutex);
return ret;
}
/* Initialise Miphy for PCIe or SATA */
if (miphy_phy->type == MIPHY_TYPE_PCIE)
ret = miphy365x_init_pcie_port(miphy_phy, miphy_dev);
else
ret = miphy365x_init_sata_port(miphy_phy, miphy_dev);
mutex_unlock(&miphy_dev->miphy_mutex);
return ret;
}
int miphy365x_get_addr(struct device *dev, struct miphy365x_phy *miphy_phy,
int index)
{
struct device_node *phynode = miphy_phy->phy->dev.of_node;
const char *name;
const __be32 *taddr;
int type = miphy_phy->type;
int ret;
ret = of_property_read_string_index(phynode, "reg-names", index, &name);
if (ret) {
dev_err(dev, "no reg-names property not found\n");
return ret;
}
if (!strncmp(name, "syscfg", 6)) {
taddr = of_get_address(phynode, index, NULL, NULL);
if (!taddr) {
dev_err(dev, "failed to fetch syscfg address\n");
return -EINVAL;
}
miphy_phy->ctrlreg = of_translate_address(phynode, taddr);
if (miphy_phy->ctrlreg == OF_BAD_ADDR) {
dev_err(dev, "failed to translate syscfg address\n");
return -EINVAL;
}
return 0;
}
if (!((!strncmp(name, "sata", 4) && type == MIPHY_TYPE_SATA) ||
(!strncmp(name, "pcie", 4) && type == MIPHY_TYPE_PCIE)))
return 0;
miphy_phy->base = of_iomap(phynode, index);
if (!miphy_phy->base) {
dev_err(dev, "Failed to map %s\n", phynode->full_name);
return -EINVAL;
}
return 0;
}
static struct phy *miphy365x_xlate(struct device *dev,
struct of_phandle_args *args)
{
struct miphy365x_dev *miphy_dev = dev_get_drvdata(dev);
struct miphy365x_phy *miphy_phy = NULL;
struct device_node *phynode = args->np;
int ret, index;
if (!of_device_is_available(phynode)) {
dev_warn(dev, "Requested PHY is disabled\n");
return ERR_PTR(-ENODEV);
}
if (args->args_count != 1) {
dev_err(dev, "Invalid number of cells in 'phy' property\n");
return ERR_PTR(-EINVAL);
}
for (index = 0; index < of_get_child_count(dev->of_node); index++)
if (phynode == miphy_dev->phys[index]->phy->dev.of_node) {
miphy_phy = miphy_dev->phys[index];
break;
}
if (!miphy_phy) {
dev_err(dev, "Failed to find appropriate phy\n");
return ERR_PTR(-EINVAL);
}
miphy_phy->type = args->args[0];
if (!(miphy_phy->type == MIPHY_TYPE_SATA ||
miphy_phy->type == MIPHY_TYPE_PCIE)) {
dev_err(dev, "Unsupported device type: %d\n", miphy_phy->type);
return ERR_PTR(-EINVAL);
}
/* Each port handles SATA and PCIE - third entry is always sysconf. */
for (index = 0; index < 3; index++) {
ret = miphy365x_get_addr(dev, miphy_phy, index);
if (ret < 0)
return ERR_PTR(ret);
}
return miphy_phy->phy;
}
static struct phy_ops miphy365x_ops = {
.init = miphy365x_init,
.owner = THIS_MODULE,
};
static int miphy365x_of_probe(struct device_node *phynode,
struct miphy365x_phy *miphy_phy)
{
of_property_read_u32(phynode, "st,sata-gen", &miphy_phy->sata_gen);
if (!miphy_phy->sata_gen)
miphy_phy->sata_gen = SATA_GEN1;
miphy_phy->pcie_tx_pol_inv =
of_property_read_bool(phynode, "st,pcie-tx-pol-inv");
miphy_phy->sata_tx_pol_inv =
of_property_read_bool(phynode, "st,sata-tx-pol-inv");
return 0;
}
static int miphy365x_probe(struct platform_device *pdev)
{
struct device_node *child, *np = pdev->dev.of_node;
struct miphy365x_dev *miphy_dev;
struct phy_provider *provider;
struct phy *phy;
int chancount, port = 0;
int ret;
miphy_dev = devm_kzalloc(&pdev->dev, sizeof(*miphy_dev), GFP_KERNEL);
if (!miphy_dev)
return -ENOMEM;
chancount = of_get_child_count(np);
miphy_dev->phys = devm_kzalloc(&pdev->dev, sizeof(phy) * chancount,
GFP_KERNEL);
if (!miphy_dev->phys)
return -ENOMEM;
miphy_dev->regmap = syscon_regmap_lookup_by_phandle(np, "st,syscfg");
if (IS_ERR(miphy_dev->regmap)) {
dev_err(miphy_dev->dev, "No syscfg phandle specified\n");
return PTR_ERR(miphy_dev->regmap);
}
miphy_dev->dev = &pdev->dev;
dev_set_drvdata(&pdev->dev, miphy_dev);
mutex_init(&miphy_dev->miphy_mutex);
for_each_child_of_node(np, child) {
struct miphy365x_phy *miphy_phy;
miphy_phy = devm_kzalloc(&pdev->dev, sizeof(*miphy_phy),
GFP_KERNEL);
if (!miphy_phy)
return -ENOMEM;
miphy_dev->phys[port] = miphy_phy;
phy = devm_phy_create(&pdev->dev, child, &miphy365x_ops, NULL);
if (IS_ERR(phy)) {
dev_err(&pdev->dev, "failed to create PHY\n");
return PTR_ERR(phy);
}
miphy_dev->phys[port]->phy = phy;
ret = miphy365x_of_probe(child, miphy_phy);
if (ret)
return ret;
phy_set_drvdata(phy, miphy_dev->phys[port]);
port++;
}
provider = devm_of_phy_provider_register(&pdev->dev, miphy365x_xlate);
if (IS_ERR(provider))
return PTR_ERR(provider);
return 0;
}
static const struct of_device_id miphy365x_of_match[] = {
{ .compatible = "st,miphy365x-phy", },
{ },
};
MODULE_DEVICE_TABLE(of, miphy365x_of_match);
static struct platform_driver miphy365x_driver = {
.probe = miphy365x_probe,
.driver = {
.name = "miphy365x-phy",
.owner = THIS_MODULE,
.of_match_table = miphy365x_of_match,
}
};
module_platform_driver(miphy365x_driver);
MODULE_AUTHOR("Alexandre Torgue <alexandre.torgue@st.com>");
MODULE_DESCRIPTION("STMicroelectronics miphy365x driver");
MODULE_LICENSE("GPL v2");