// SPDX-License-Identifier: GPL-2.0
//
// Secure Digital Host Controller
//
// Copyright (C) 2018 Spreadtrum, Inc.
// Author: Chunyan Zhang <[email protected]>
#include <linux/delay.h>
#include <linux/dma-mapping.h>
#include <linux/highmem.h>
#include <linux/iopoll.h>
#include <linux/mmc/host.h>
#include <linux/mmc/mmc.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/pinctrl/consumer.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/regulator/consumer.h>
#include <linux/slab.h>
#include "sdhci-pltfm.h"
#include "mmc_hsq.h"
/* SDHCI_ARGUMENT2 register high 16bit */
#define SDHCI_SPRD_ARG2_STUFF GENMASK(31, 16)
#define SDHCI_SPRD_REG_32_DLL_CFG 0x200
#define SDHCI_SPRD_DLL_ALL_CPST_EN (BIT(18) | BIT(24) | BIT(25) | BIT(26) | BIT(27))
#define SDHCI_SPRD_DLL_EN BIT(21)
#define SDHCI_SPRD_DLL_SEARCH_MODE BIT(16)
#define SDHCI_SPRD_DLL_INIT_COUNT 0xc00
#define SDHCI_SPRD_DLL_PHASE_INTERNAL 0x3
#define SDHCI_SPRD_REG_32_DLL_DLY 0x204
#define SDHCI_SPRD_REG_32_DLL_DLY_OFFSET 0x208
#define SDHCIBSPRD_IT_WR_DLY_INV BIT(5)
#define SDHCI_SPRD_BIT_CMD_DLY_INV BIT(13)
#define SDHCI_SPRD_BIT_POSRD_DLY_INV BIT(21)
#define SDHCI_SPRD_BIT_NEGRD_DLY_INV BIT(29)
#define SDHCI_SPRD_REG_32_DLL_STS0 0x210
#define SDHCI_SPRD_DLL_LOCKED BIT(18)
#define SDHCI_SPRD_REG_32_BUSY_POSI 0x250
#define SDHCI_SPRD_BIT_OUTR_CLK_AUTO_EN BIT(25)
#define SDHCI_SPRD_BIT_INNR_CLK_AUTO_EN BIT(24)
#define SDHCI_SPRD_REG_DEBOUNCE 0x28C
#define SDHCI_SPRD_BIT_DLL_BAK BIT(0)
#define SDHCI_SPRD_BIT_DLL_VAL BIT(1)
#define SDHCI_SPRD_INT_SIGNAL_MASK 0x1B7F410B
/* SDHCI_HOST_CONTROL2 */
#define SDHCI_SPRD_CTRL_HS200 0x0005
#define SDHCI_SPRD_CTRL_HS400 0x0006
#define SDHCI_SPRD_CTRL_HS400ES 0x0007
/*
* According to the standard specification, BIT(3) of SDHCI_SOFTWARE_RESET is
* reserved, and only used on Spreadtrum's design, the hardware cannot work
* if this bit is cleared.
* 1 : normal work
* 0 : hardware reset
*/
#define SDHCI_HW_RESET_CARD BIT(3)
#define SDHCI_SPRD_MAX_CUR 0xFFFFFF
#define SDHCI_SPRD_CLK_MAX_DIV 1023
#define SDHCI_SPRD_CLK_DEF_RATE 26000000
#define SDHCI_SPRD_PHY_DLL_CLK 52000000
#define SDHCI_SPRD_MAX_RANGE 0xff
#define SDHCI_SPRD_CMD_DLY_MASK GENMASK(15, 8)
#define SDHCI_SPRD_POSRD_DLY_MASK GENMASK(23, 16)
#define SDHCI_SPRD_CPST_EN GENMASK(27, 24)
struct sdhci_sprd_host {
u32 version;
struct clk *clk_sdio;
struct clk *clk_enable;
struct clk *clk_2x_enable;
struct pinctrl *pinctrl;
struct pinctrl_state *pins_uhs;
struct pinctrl_state *pins_default;
u32 base_rate;
int flags; /* backup of host attribute */
u32 phy_delay[MMC_TIMING_MMC_HS400 + 2];
};
enum sdhci_sprd_tuning_type {
SDHCI_SPRD_TUNING_SD_HS_CMD,
SDHCI_SPRD_TUNING_SD_HS_DATA,
};
struct sdhci_sprd_phy_cfg {
const char *property;
u8 timing;
};
static const struct sdhci_sprd_phy_cfg sdhci_sprd_phy_cfgs[] = {
{ "sprd,phy-delay-legacy", MMC_TIMING_LEGACY, },
{ "sprd,phy-delay-sd-highspeed", MMC_TIMING_SD_HS, },
{ "sprd,phy-delay-sd-uhs-sdr50", MMC_TIMING_UHS_SDR50, },
{ "sprd,phy-delay-sd-uhs-sdr104", MMC_TIMING_UHS_SDR104, },
{ "sprd,phy-delay-mmc-highspeed", MMC_TIMING_MMC_HS, },
{ "sprd,phy-delay-mmc-ddr52", MMC_TIMING_MMC_DDR52, },
{ "sprd,phy-delay-mmc-hs200", MMC_TIMING_MMC_HS200, },
{ "sprd,phy-delay-mmc-hs400", MMC_TIMING_MMC_HS400, },
{ "sprd,phy-delay-mmc-hs400es", MMC_TIMING_MMC_HS400 + 1, },
};
#define TO_SPRD_HOST(host) sdhci_pltfm_priv(sdhci_priv(host))
static void sdhci_sprd_init_config(struct sdhci_host *host)
{
u16 val;
/* set dll backup mode */
val = sdhci_readl(host, SDHCI_SPRD_REG_DEBOUNCE);
val |= SDHCI_SPRD_BIT_DLL_BAK | SDHCI_SPRD_BIT_DLL_VAL;
sdhci_writel(host, val, SDHCI_SPRD_REG_DEBOUNCE);
}
static inline u32 sdhci_sprd_readl(struct sdhci_host *host, int reg)
{
if (unlikely(reg == SDHCI_MAX_CURRENT))
return SDHCI_SPRD_MAX_CUR;
return readl_relaxed(host->ioaddr + reg);
}
static inline void sdhci_sprd_writel(struct sdhci_host *host, u32 val, int reg)
{
/* SDHCI_MAX_CURRENT is reserved on Spreadtrum's platform */
if (unlikely(reg == SDHCI_MAX_CURRENT))
return;
if (unlikely(reg == SDHCI_SIGNAL_ENABLE || reg == SDHCI_INT_ENABLE))
val = val & SDHCI_SPRD_INT_SIGNAL_MASK;
writel_relaxed(val, host->ioaddr + reg);
}
static inline void sdhci_sprd_writew(struct sdhci_host *host, u16 val, int reg)
{
/* SDHCI_BLOCK_COUNT is Read Only on Spreadtrum's platform */
if (unlikely(reg == SDHCI_BLOCK_COUNT))
return;
writew_relaxed(val, host->ioaddr + reg);
}
static inline void sdhci_sprd_writeb(struct sdhci_host *host, u8 val, int reg)
{
/*
* Since BIT(3) of SDHCI_SOFTWARE_RESET is reserved according to the
* standard specification, sdhci_reset() write this register directly
* without checking other reserved bits, that will clear BIT(3) which
* is defined as hardware reset on Spreadtrum's platform and clearing
* it by mistake will lead the card not work. So here we need to work
* around it.
*/
if (unlikely(reg == SDHCI_SOFTWARE_RESET)) {
if (readb_relaxed(host->ioaddr + reg) & SDHCI_HW_RESET_CARD)
val |= SDHCI_HW_RESET_CARD;
}
writeb_relaxed(val, host->ioaddr + reg);
}
static inline void sdhci_sprd_sd_clk_off(struct sdhci_host *host)
{
u16 ctrl = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
ctrl &= ~SDHCI_CLOCK_CARD_EN;
sdhci_writew(host, ctrl, SDHCI_CLOCK_CONTROL);
}
static inline void sdhci_sprd_sd_clk_on(struct sdhci_host *host)
{
u16 ctrl;
ctrl = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
ctrl |= SDHCI_CLOCK_CARD_EN;
sdhci_writew(host, ctrl, SDHCI_CLOCK_CONTROL);
}
static inline void
sdhci_sprd_set_dll_invert(struct sdhci_host *host, u32 mask, bool en)
{
u32 dll_dly_offset;
dll_dly_offset = sdhci_readl(host, SDHCI_SPRD_REG_32_DLL_DLY_OFFSET);
if (en)
dll_dly_offset |= mask;
else
dll_dly_offset &= ~mask;
sdhci_writel(host, dll_dly_offset, SDHCI_SPRD_REG_32_DLL_DLY_OFFSET);
}
static inline u32 sdhci_sprd_calc_div(u32 base_clk, u32 clk)
{
u32 div;
/* select 2x clock source */
if (base_clk <= clk * 2)
return 0;
div = (u32) (base_clk / (clk * 2));
if ((base_clk / div) > (clk * 2))
div++;
if (div % 2)
div = (div + 1) / 2;
else
div = div / 2;
if (div > SDHCI_SPRD_CLK_MAX_DIV)
div = SDHCI_SPRD_CLK_MAX_DIV;
return div;
}
static inline void _sdhci_sprd_set_clock(struct sdhci_host *host,
unsigned int clk)
{
struct sdhci_sprd_host *sprd_host = TO_SPRD_HOST(host);
u32 div, val, mask;
sdhci_writew(host, 0, SDHCI_CLOCK_CONTROL);
div = sdhci_sprd_calc_div(sprd_host->base_rate, clk);
div = ((div & 0x300) >> 2) | ((div & 0xFF) << 8);
sdhci_enable_clk(host, div);
val = sdhci_readl(host, SDHCI_SPRD_REG_32_BUSY_POSI);
mask = SDHCI_SPRD_BIT_OUTR_CLK_AUTO_EN | SDHCI_SPRD_BIT_INNR_CLK_AUTO_EN;
/* Enable CLK_AUTO when the clock is greater than 400K. */
if (clk > 400000) {
if (mask != (val & mask)) {
val |= mask;
sdhci_writel(host, val, SDHCI_SPRD_REG_32_BUSY_POSI);
}
} else {
if (val & mask) {
val &= ~mask;
sdhci_writel(host, val, SDHCI_SPRD_REG_32_BUSY_POSI);
}
}
}
static void sdhci_sprd_enable_phy_dll(struct sdhci_host *host)
{
u32 tmp;
tmp = sdhci_readl(host, SDHCI_SPRD_REG_32_DLL_CFG);
tmp &= ~(SDHCI_SPRD_DLL_EN | SDHCI_SPRD_DLL_ALL_CPST_EN);
sdhci_writel(host, tmp, SDHCI_SPRD_REG_32_DLL_CFG);
/* wait 1ms */
usleep_range(1000, 1250);
tmp = sdhci_readl(host, SDHCI_SPRD_REG_32_DLL_CFG);
tmp |= SDHCI_SPRD_DLL_ALL_CPST_EN | SDHCI_SPRD_DLL_SEARCH_MODE |
SDHCI_SPRD_DLL_INIT_COUNT | SDHCI_SPRD_DLL_PHASE_INTERNAL;
sdhci_writel(host, tmp, SDHCI_SPRD_REG_32_DLL_CFG);
/* wait 1ms */
usleep_range(1000, 1250);
tmp = sdhci_readl(host, SDHCI_SPRD_REG_32_DLL_CFG);
tmp |= SDHCI_SPRD_DLL_EN;
sdhci_writel(host, tmp, SDHCI_SPRD_REG_32_DLL_CFG);
/* wait 1ms */
usleep_range(1000, 1250);
if (read_poll_timeout(sdhci_readl, tmp, (tmp & SDHCI_SPRD_DLL_LOCKED),
2000, USEC_PER_SEC, false, host, SDHCI_SPRD_REG_32_DLL_STS0)) {
pr_err("%s: DLL locked fail!\n", mmc_hostname(host->mmc));
pr_info("%s: DLL_STS0 : 0x%x, DLL_CFG : 0x%x\n",
mmc_hostname(host->mmc),
sdhci_readl(host, SDHCI_SPRD_REG_32_DLL_STS0),
sdhci_readl(host, SDHCI_SPRD_REG_32_DLL_CFG));
}
}
static void sdhci_sprd_set_clock(struct sdhci_host *host, unsigned int clock)
{
bool en = false, clk_changed = false;
if (clock == 0) {
sdhci_writew(host, 0, SDHCI_CLOCK_CONTROL);
} else if (clock != host->clock) {
sdhci_sprd_sd_clk_off(host);
_sdhci_sprd_set_clock(host, clock);
if (clock <= 400000)
en = true;
sdhci_sprd_set_dll_invert(host, SDHCI_SPRD_BIT_CMD_DLY_INV |
SDHCI_SPRD_BIT_POSRD_DLY_INV, en);
clk_changed = true;
} else {
_sdhci_sprd_set_clock(host, clock);
}
/*
* According to the Spreadtrum SD host specification, when we changed
* the clock to be more than 52M, we should enable the PHY DLL which
* is used to track the clock frequency to make the clock work more
* stable. Otherwise deviation may occur of the higher clock.
*/
if (clk_changed && clock > SDHCI_SPRD_PHY_DLL_CLK)
sdhci_sprd_enable_phy_dll(host);
}
static unsigned int sdhci_sprd_get_max_clock(struct sdhci_host *host)
{
struct sdhci_sprd_host *sprd_host = TO_SPRD_HOST(host);
return clk_round_rate(sprd_host->clk_sdio, ULONG_MAX);
}
static unsigned int sdhci_sprd_get_min_clock(struct sdhci_host *host)
{
return 100000;
}
static void sdhci_sprd_set_uhs_signaling(struct sdhci_host *host,
unsigned int timing)
{
struct sdhci_sprd_host *sprd_host = TO_SPRD_HOST(host);
struct mmc_host *mmc = host->mmc;
u32 *p = sprd_host->phy_delay;
u16 ctrl_2;
if (timing == host->timing)
return;
ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
/* Select Bus Speed Mode for host */
ctrl_2 &= ~SDHCI_CTRL_UHS_MASK;
switch (timing) {
case MMC_TIMING_UHS_SDR12:
ctrl_2 |= SDHCI_CTRL_UHS_SDR12;
break;
case MMC_TIMING_MMC_HS:
case MMC_TIMING_SD_HS:
case MMC_TIMING_UHS_SDR25:
ctrl_2 |= SDHCI_CTRL_UHS_SDR25;
break;
case MMC_TIMING_UHS_SDR50:
ctrl_2 |= SDHCI_CTRL_UHS_SDR50;
break;
case MMC_TIMING_UHS_SDR104:
ctrl_2 |= SDHCI_CTRL_UHS_SDR104;
break;
case MMC_TIMING_UHS_DDR50:
case MMC_TIMING_MMC_DDR52:
ctrl_2 |= SDHCI_CTRL_UHS_DDR50;
break;
case MMC_TIMING_MMC_HS200:
ctrl_2 |= SDHCI_SPRD_CTRL_HS200;
break;
case MMC_TIMING_MMC_HS400:
ctrl_2 |= SDHCI_SPRD_CTRL_HS400;
break;
default:
break;
}
sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2);
if (!mmc->ios.enhanced_strobe)
sdhci_writel(host, p[timing], SDHCI_SPRD_REG_32_DLL_DLY);
}
static void sdhci_sprd_hw_reset(struct sdhci_host *host)
{
int val;
/*
* Note: don't use sdhci_writeb() API here since it is redirected to
* sdhci_sprd_writeb() in which we have a workaround for
* SDHCI_SOFTWARE_RESET which would make bit SDHCI_HW_RESET_CARD can
* not be cleared.
*/
val = readb_relaxed(host->ioaddr + SDHCI_SOFTWARE_RESET);
val &= ~SDHCI_HW_RESET_CARD;
writeb_relaxed(val, host->ioaddr + SDHCI_SOFTWARE_RESET);
/* wait for 10 us */
usleep_range(10, 20);
val |= SDHCI_HW_RESET_CARD;
writeb_relaxed(val, host->ioaddr + SDHCI_SOFTWARE_RESET);
usleep_range(300, 500);
}
static unsigned int sdhci_sprd_get_max_timeout_count(struct sdhci_host *host)
{
/* The Spredtrum controller actual maximum timeout count is 1 << 31 */
return 1 << 31;
}
static unsigned int sdhci_sprd_get_ro(struct sdhci_host *host)
{
return 0;
}
static void sdhci_sprd_request_done(struct sdhci_host *host,
struct mmc_request *mrq)
{
/* Validate if the request was from software queue firstly. */
if (mmc_hsq_finalize_request(host->mmc, mrq))
return;
mmc_request_done(host->mmc, mrq);
}
static void sdhci_sprd_set_power(struct sdhci_host *host, unsigned char mode,
unsigned short vdd)
{
struct mmc_host *mmc = host->mmc;
switch (mode) {
case MMC_POWER_OFF:
mmc_regulator_set_ocr(host->mmc, mmc->supply.vmmc, 0);
mmc_regulator_disable_vqmmc(mmc);
break;
case MMC_POWER_ON:
mmc_regulator_enable_vqmmc(mmc);
break;
case MMC_POWER_UP:
mmc_regulator_set_ocr(host->mmc, mmc->supply.vmmc, vdd);
break;
}
}
static const struct sdhci_ops sdhci_sprd_ops = {
.read_l = sdhci_sprd_readl,
.write_l = sdhci_sprd_writel,
.write_w = sdhci_sprd_writew,
.write_b = sdhci_sprd_writeb,
.set_clock = sdhci_sprd_set_clock,
.set_power = sdhci_sprd_set_power,
.get_max_clock = sdhci_sprd_get_max_clock,
.get_min_clock = sdhci_sprd_get_min_clock,
.set_bus_width = sdhci_set_bus_width,
.reset = sdhci_reset,
.set_uhs_signaling = sdhci_sprd_set_uhs_signaling,
.hw_reset = sdhci_sprd_hw_reset,
.get_max_timeout_count = sdhci_sprd_get_max_timeout_count,
.get_ro = sdhci_sprd_get_ro,
.request_done = sdhci_sprd_request_done,
};
static void sdhci_sprd_check_auto_cmd23(struct mmc_host *mmc,
struct mmc_request *mrq)
{
struct sdhci_host *host = mmc_priv(mmc);
struct sdhci_sprd_host *sprd_host = TO_SPRD_HOST(host);
host->flags |= sprd_host->flags & SDHCI_AUTO_CMD23;
/*
* From version 4.10 onward, ARGUMENT2 register is also as 32-bit
* block count register which doesn't support stuff bits of
* CMD23 argument on Spreadtrum's sd host controller.
*/
if (host->version >= SDHCI_SPEC_410 &&
mrq->sbc && (mrq->sbc->arg & SDHCI_SPRD_ARG2_STUFF) &&
(host->flags & SDHCI_AUTO_CMD23))
host->flags &= ~SDHCI_AUTO_CMD23;
}
static void sdhci_sprd_request(struct mmc_host *mmc, struct mmc_request *mrq)
{
sdhci_sprd_check_auto_cmd23(mmc, mrq);
sdhci_request(mmc, mrq);
}
static int sdhci_sprd_request_atomic(struct mmc_host *mmc,
struct mmc_request *mrq)
{
sdhci_sprd_check_auto_cmd23(mmc, mrq);
return sdhci_request_atomic(mmc, mrq);
}
static int sdhci_sprd_voltage_switch(struct mmc_host *mmc, struct mmc_ios *ios)
{
struct sdhci_host *host = mmc_priv(mmc);
struct sdhci_sprd_host *sprd_host = TO_SPRD_HOST(host);
int ret;
if (!IS_ERR(mmc->supply.vqmmc)) {
ret = mmc_regulator_set_vqmmc(mmc, ios);
if (ret < 0) {
pr_err("%s: Switching signalling voltage failed\n",
mmc_hostname(mmc));
return ret;
}
}
if (IS_ERR(sprd_host->pinctrl))
goto reset;
switch (ios->signal_voltage) {
case MMC_SIGNAL_VOLTAGE_180:
ret = pinctrl_select_state(sprd_host->pinctrl,
sprd_host->pins_uhs);
if (ret) {
pr_err("%s: failed to select uhs pin state\n",
mmc_hostname(mmc));
return ret;
}
break;
default:
fallthrough;
case MMC_SIGNAL_VOLTAGE_330:
ret = pinctrl_select_state(sprd_host->pinctrl,
sprd_host->pins_default);
if (ret) {
pr_err("%s: failed to select default pin state\n",
mmc_hostname(mmc));
return ret;
}
break;
}
/* Wait for 300 ~ 500 us for pin state stable */
usleep_range(300, 500);
reset:
sdhci_reset(host, SDHCI_RESET_CMD | SDHCI_RESET_DATA);
return 0;
}
static void sdhci_sprd_hs400_enhanced_strobe(struct mmc_host *mmc,
struct mmc_ios *ios)
{
struct sdhci_host *host = mmc_priv(mmc);
struct sdhci_sprd_host *sprd_host = TO_SPRD_HOST(host);
u32 *p = sprd_host->phy_delay;
u16 ctrl_2;
if (!ios->enhanced_strobe)
return;
sdhci_sprd_sd_clk_off(host);
/* Set HS400 enhanced strobe mode */
ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
ctrl_2 &= ~SDHCI_CTRL_UHS_MASK;
ctrl_2 |= SDHCI_SPRD_CTRL_HS400ES;
sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2);
sdhci_sprd_sd_clk_on(host);
/* Set the PHY DLL delay value for HS400 enhanced strobe mode */
sdhci_writel(host, p[MMC_TIMING_MMC_HS400 + 1],
SDHCI_SPRD_REG_32_DLL_DLY);
}
static int mmc_send_tuning_cmd(struct mmc_card *card)
{
return mmc_send_status(card, NULL);
}
static int mmc_send_tuning_data(struct mmc_card *card)
{
u8 *status;
int ret;
status = kmalloc(64, GFP_KERNEL);
if (!status)
return -ENOMEM;
ret = mmc_sd_switch(card, 0, 0, 0, status);
kfree(status);
return ret;
}
static int sdhci_sprd_get_best_clk_sample(struct mmc_host *mmc, u8 *value)
{
int range_end = SDHCI_SPRD_MAX_RANGE;
int range_length = 0;
int middle_range = 0;
int count = 0;
int i;
for (i = 0; i <= SDHCI_SPRD_MAX_RANGE; i++) {
if (value[i]) {
pr_debug("%s: tuning ok: %d\n", mmc_hostname(mmc), i);
count++;
} else {
pr_debug("%s: tuning fail: %d\n", mmc_hostname(mmc), i);
if (range_length < count) {
range_length = count;
range_end = i - 1;
count = 0;
}
}
}
if (!count)
return -EIO;
if (count > range_length) {
range_length = count;
range_end = i - 1;
}
middle_range = range_end - (range_length - 1) / 2;
return middle_range;
}
static int sdhci_sprd_tuning(struct mmc_host *mmc, struct mmc_card *card,
enum sdhci_sprd_tuning_type type)
{
struct sdhci_host *host = mmc_priv(mmc);
struct sdhci_sprd_host *sprd_host = TO_SPRD_HOST(host);
u32 *p = sprd_host->phy_delay;
u32 dll_cfg, dll_dly;
int best_clk_sample;
int err = 0;
u8 *value;
int i;
value = kmalloc(SDHCI_SPRD_MAX_RANGE + 1, GFP_KERNEL);
if (!value)
return -ENOMEM;
sdhci_reset(host, SDHCI_RESET_CMD | SDHCI_RESET_DATA);
dll_cfg = sdhci_readl(host, SDHCI_SPRD_REG_32_DLL_CFG);
dll_cfg &= ~SDHCI_SPRD_CPST_EN;
sdhci_writel(host, dll_cfg, SDHCI_SPRD_REG_32_DLL_CFG);
dll_dly = p[mmc->ios.timing];
for (i = 0; i <= SDHCI_SPRD_MAX_RANGE; i++) {
if (type == SDHCI_SPRD_TUNING_SD_HS_CMD) {
dll_dly &= ~SDHCI_SPRD_CMD_DLY_MASK;
dll_dly |= ((i << 8) & SDHCI_SPRD_CMD_DLY_MASK);
} else {
dll_dly &= ~SDHCI_SPRD_POSRD_DLY_MASK;
dll_dly |= ((i << 16) & SDHCI_SPRD_POSRD_DLY_MASK);
}
sdhci_writel(host, dll_dly, SDHCI_SPRD_REG_32_DLL_DLY);
if (type == SDHCI_SPRD_TUNING_SD_HS_CMD)
value[i] = !mmc_send_tuning_cmd(card);
else
value[i] = !mmc_send_tuning_data(card);
}
best_clk_sample = sdhci_sprd_get_best_clk_sample(mmc, value);
if (best_clk_sample < 0) {
dev_err(mmc_dev(host->mmc), "all tuning phase fail!\n");
err = best_clk_sample;
goto out;
}
if (type == SDHCI_SPRD_TUNING_SD_HS_CMD) {
p[mmc->ios.timing] &= ~SDHCI_SPRD_CMD_DLY_MASK;
p[mmc->ios.timing] |= ((best_clk_sample << 8) & SDHCI_SPRD_CMD_DLY_MASK);
} else {
p[mmc->ios.timing] &= ~(SDHCI_SPRD_POSRD_DLY_MASK);
p[mmc->ios.timing] |= ((best_clk_sample << 16) & SDHCI_SPRD_POSRD_DLY_MASK);
}
pr_debug("%s: the best clk sample %d, delay value 0x%08x\n",
mmc_hostname(host->mmc), best_clk_sample, p[mmc->ios.timing]);
out:
sdhci_writel(host, p[mmc->ios.timing], SDHCI_SPRD_REG_32_DLL_DLY);
kfree(value);
return err;
}
static int sdhci_sprd_prepare_sd_hs_cmd_tuning(struct mmc_host *mmc, struct mmc_card *card)
{
return sdhci_sprd_tuning(mmc, card, SDHCI_SPRD_TUNING_SD_HS_CMD);
}
static int sdhci_sprd_execute_sd_hs_data_tuning(struct mmc_host *mmc, struct mmc_card *card)
{
return sdhci_sprd_tuning(mmc, card, SDHCI_SPRD_TUNING_SD_HS_DATA);
}
static void sdhci_sprd_phy_param_parse(struct sdhci_sprd_host *sprd_host,
struct device_node *np)
{
u32 *p = sprd_host->phy_delay;
int ret, i, index;
u32 val[4];
for (i = 0; i < ARRAY_SIZE(sdhci_sprd_phy_cfgs); i++) {
ret = of_property_read_u32_array(np,
sdhci_sprd_phy_cfgs[i].property, val, 4);
if (ret)
continue;
index = sdhci_sprd_phy_cfgs[i].timing;
p[index] = val[0] | (val[1] << 8) | (val[2] << 16) | (val[3] << 24);
}
}
static const struct sdhci_pltfm_data sdhci_sprd_pdata = {
.quirks = SDHCI_QUIRK_BROKEN_CARD_DETECTION |
SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK,
.quirks2 = SDHCI_QUIRK2_BROKEN_HS200 |
SDHCI_QUIRK2_USE_32BIT_BLK_CNT |
SDHCI_QUIRK2_PRESET_VALUE_BROKEN,
.ops = &sdhci_sprd_ops,
};
static int sdhci_sprd_probe(struct platform_device *pdev)
{
struct sdhci_host *host;
struct sdhci_sprd_host *sprd_host;
struct mmc_hsq *hsq;
struct clk *clk;
int ret = 0;
host = sdhci_pltfm_init(pdev, &sdhci_sprd_pdata, sizeof(*sprd_host));
if (IS_ERR(host))
return PTR_ERR(host);
host->dma_mask = DMA_BIT_MASK(64);
pdev->dev.dma_mask = &host->dma_mask;
host->mmc_host_ops.request = sdhci_sprd_request;
host->mmc_host_ops.hs400_enhanced_strobe =
sdhci_sprd_hs400_enhanced_strobe;
host->mmc_host_ops.prepare_sd_hs_tuning =
sdhci_sprd_prepare_sd_hs_cmd_tuning;
host->mmc_host_ops.execute_sd_hs_tuning =
sdhci_sprd_execute_sd_hs_data_tuning;
/*
* We can not use the standard ops to change and detect the voltage
* signal for Spreadtrum SD host controller, since our voltage regulator
* for I/O is fixed in hardware, that means we do not need control
* the standard SD host controller to change the I/O voltage.
*/
host->mmc_host_ops.start_signal_voltage_switch =
sdhci_sprd_voltage_switch;
host->mmc->caps = MMC_CAP_SD_HIGHSPEED | MMC_CAP_MMC_HIGHSPEED |
MMC_CAP_WAIT_WHILE_BUSY;
ret = mmc_of_parse(host->mmc);
if (ret)
goto pltfm_free;
if (!mmc_card_is_removable(host->mmc))
host->mmc_host_ops.request_atomic = sdhci_sprd_request_atomic;
else
host->always_defer_done = true;
sprd_host = TO_SPRD_HOST(host);
sdhci_sprd_phy_param_parse(sprd_host, pdev->dev.of_node);
sprd_host->pinctrl = devm_pinctrl_get(&pdev->dev);
if (!IS_ERR(sprd_host->pinctrl)) {
sprd_host->pins_uhs =
pinctrl_lookup_state(sprd_host->pinctrl, "state_uhs");
if (IS_ERR(sprd_host->pins_uhs)) {
ret = PTR_ERR(sprd_host->pins_uhs);
goto pltfm_free;
}
sprd_host->pins_default =
pinctrl_lookup_state(sprd_host->pinctrl, "default");
if (IS_ERR(sprd_host->pins_default)) {
ret = PTR_ERR(sprd_host->pins_default);
goto pltfm_free;
}
}
clk = devm_clk_get(&pdev->dev, "sdio");
if (IS_ERR(clk)) {
ret = PTR_ERR(clk);
goto pltfm_free;
}
sprd_host->clk_sdio = clk;
sprd_host->base_rate = clk_get_rate(sprd_host->clk_sdio);
if (!sprd_host->base_rate)
sprd_host->base_rate = SDHCI_SPRD_CLK_DEF_RATE;
clk = devm_clk_get(&pdev->dev, "enable");
if (IS_ERR(clk)) {
ret = PTR_ERR(clk);
goto pltfm_free;
}
sprd_host->clk_enable = clk;
clk = devm_clk_get(&pdev->dev, "2x_enable");
if (!IS_ERR(clk))
sprd_host->clk_2x_enable = clk;
ret = clk_prepare_enable(sprd_host->clk_sdio);
if (ret)
goto pltfm_free;
ret = clk_prepare_enable(sprd_host->clk_enable);
if (ret)
goto clk_disable;
ret = clk_prepare_enable(sprd_host->clk_2x_enable);
if (ret)
goto clk_disable2;
sdhci_sprd_init_config(host);
host->version = sdhci_readw(host, SDHCI_HOST_VERSION);
sprd_host->version = ((host->version & SDHCI_VENDOR_VER_MASK) >>
SDHCI_VENDOR_VER_SHIFT);
pm_runtime_get_noresume(&pdev->dev);
pm_runtime_set_active(&pdev->dev);
pm_runtime_enable(&pdev->dev);
pm_runtime_set_autosuspend_delay(&pdev->dev, 50);
pm_runtime_use_autosuspend(&pdev->dev);
pm_suspend_ignore_children(&pdev->dev, 1);
sdhci_enable_v4_mode(host);
/*
* Supply the existing CAPS, but clear the UHS-I modes. This
* will allow these modes to be specified only by device
* tree properties through mmc_of_parse().
*/
sdhci_read_caps(host);
host->caps1 &= ~(SDHCI_SUPPORT_SDR50 | SDHCI_SUPPORT_SDR104 |
SDHCI_SUPPORT_DDR50);
ret = mmc_regulator_get_supply(host->mmc);
if (ret)
goto pm_runtime_disable;
ret = sdhci_setup_host(host);
if (ret)
goto pm_runtime_disable;
sprd_host->flags = host->flags;
hsq = devm_kzalloc(&pdev->dev, sizeof(*hsq), GFP_KERNEL);
if (!hsq) {
ret = -ENOMEM;
goto err_cleanup_host;
}
ret = mmc_hsq_init(hsq, host->mmc);
if (ret)
goto err_cleanup_host;
ret = __sdhci_add_host(host);
if (ret)
goto err_cleanup_host;
pm_runtime_mark_last_busy(&pdev->dev);
pm_runtime_put_autosuspend(&pdev->dev);
return 0;
err_cleanup_host:
sdhci_cleanup_host(host);
pm_runtime_disable:
pm_runtime_put_noidle(&pdev->dev);
pm_runtime_disable(&pdev->dev);
pm_runtime_set_suspended(&pdev->dev);
clk_disable_unprepare(sprd_host->clk_2x_enable);
clk_disable2:
clk_disable_unprepare(sprd_host->clk_enable);
clk_disable:
clk_disable_unprepare(sprd_host->clk_sdio);
pltfm_free:
sdhci_pltfm_free(pdev);
return ret;
}
static void sdhci_sprd_remove(struct platform_device *pdev)
{
struct sdhci_host *host = platform_get_drvdata(pdev);
struct sdhci_sprd_host *sprd_host = TO_SPRD_HOST(host);
sdhci_remove_host(host, 0);
clk_disable_unprepare(sprd_host->clk_sdio);
clk_disable_unprepare(sprd_host->clk_enable);
clk_disable_unprepare(sprd_host->clk_2x_enable);
sdhci_pltfm_free(pdev);
}
static const struct of_device_id sdhci_sprd_of_match[] = {
{ .compatible = "sprd,sdhci-r11", },
{ }
};
MODULE_DEVICE_TABLE(of, sdhci_sprd_of_match);
#ifdef CONFIG_PM
static int sdhci_sprd_runtime_suspend(struct device *dev)
{
struct sdhci_host *host = dev_get_drvdata(dev);
struct sdhci_sprd_host *sprd_host = TO_SPRD_HOST(host);
mmc_hsq_suspend(host->mmc);
sdhci_runtime_suspend_host(host);
clk_disable_unprepare(sprd_host->clk_sdio);
clk_disable_unprepare(sprd_host->clk_enable);
clk_disable_unprepare(sprd_host->clk_2x_enable);
return 0;
}
static int sdhci_sprd_runtime_resume(struct device *dev)
{
struct sdhci_host *host = dev_get_drvdata(dev);
struct sdhci_sprd_host *sprd_host = TO_SPRD_HOST(host);
int ret;
ret = clk_prepare_enable(sprd_host->clk_2x_enable);
if (ret)
return ret;
ret = clk_prepare_enable(sprd_host->clk_enable);
if (ret)
goto clk_2x_disable;
ret = clk_prepare_enable(sprd_host->clk_sdio);
if (ret)
goto clk_disable;
sdhci_runtime_resume_host(host, 1);
mmc_hsq_resume(host->mmc);
return 0;
clk_disable:
clk_disable_unprepare(sprd_host->clk_enable);
clk_2x_disable:
clk_disable_unprepare(sprd_host->clk_2x_enable);
return ret;
}
#endif
static const struct dev_pm_ops sdhci_sprd_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
pm_runtime_force_resume)
SET_RUNTIME_PM_OPS(sdhci_sprd_runtime_suspend,
sdhci_sprd_runtime_resume, NULL)
};
static struct platform_driver sdhci_sprd_driver = {
.probe = sdhci_sprd_probe,
.remove_new = sdhci_sprd_remove,
.driver = {
.name = "sdhci_sprd_r11",
.probe_type = PROBE_PREFER_ASYNCHRONOUS,
.of_match_table = sdhci_sprd_of_match,
.pm = &sdhci_sprd_pm_ops,
},
};
module_platform_driver(sdhci_sprd_driver);
MODULE_DESCRIPTION("Spreadtrum sdio host controller r11 driver");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:sdhci-sprd-r11");
Codebase Browser
linux