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M7350/kernel/drivers/mmc/host/sdhci-msm.c
T f9cc65cfda M7350v1_en_gpl
2024-09-09 08:52:07 +00:00

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/*
* drivers/mmc/host/sdhci-msm.c - Qualcomm MSM SDHCI Platform
* driver source file
*
* Copyright (c) 2012-2013, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
#include <linux/module.h>
#include <linux/mmc/host.h>
#include <linux/mmc/card.h>
#include <linux/mmc/sdio_func.h>
#include <linux/gfp.h>
#include <linux/of.h>
#include <linux/of_gpio.h>
#include <linux/regulator/consumer.h>
#include <linux/types.h>
#include <linux/input.h>
#include <linux/platform_device.h>
#include <linux/wait.h>
#include <linux/io.h>
#include <linux/delay.h>
#include <linux/scatterlist.h>
#include <linux/slab.h>
#include <linux/mmc/mmc.h>
#include <linux/pm.h>
#include <linux/pm_runtime.h>
#include <linux/mmc/cd-gpio.h>
#include <linux/dma-mapping.h>
#include <mach/gpio.h>
#include <mach/msm_bus.h>
#include <linux/iopoll.h>
#include "sdhci-pltfm.h"
#define SDHCI_VER_100 0x2B
#define CORE_HC_MODE 0x78
#define HC_MODE_EN 0x1
#define CORE_POWER 0x0
#define CORE_SW_RST (1 << 7)
#define CORE_PWRCTL_STATUS 0xDC
#define CORE_PWRCTL_MASK 0xE0
#define CORE_PWRCTL_CLEAR 0xE4
#define CORE_PWRCTL_CTL 0xE8
#define CORE_PWRCTL_BUS_OFF 0x01
#define CORE_PWRCTL_BUS_ON (1 << 1)
#define CORE_PWRCTL_IO_LOW (1 << 2)
#define CORE_PWRCTL_IO_HIGH (1 << 3)
#define CORE_PWRCTL_BUS_SUCCESS 0x01
#define CORE_PWRCTL_BUS_FAIL (1 << 1)
#define CORE_PWRCTL_IO_SUCCESS (1 << 2)
#define CORE_PWRCTL_IO_FAIL (1 << 3)
#define INT_MASK 0xF
#define MAX_PHASES 16
#define CORE_DLL_LOCK (1 << 7)
#define CORE_DLL_EN (1 << 16)
#define CORE_CDR_EN (1 << 17)
#define CORE_CK_OUT_EN (1 << 18)
#define CORE_CDR_EXT_EN (1 << 19)
#define CORE_DLL_PDN (1 << 29)
#define CORE_DLL_RST (1 << 30)
#define CORE_DLL_CONFIG 0x100
#define CORE_DLL_TEST_CTL 0x104
#define CORE_DLL_STATUS 0x108
#define CORE_VENDOR_SPEC 0x10C
#define CORE_CLK_PWRSAVE (1 << 1)
#define CORE_IO_PAD_PWR_SWITCH (1 << 16)
#define CORE_MCI_DATA_CTRL 0x2C
#define CORE_MCI_DPSM_ENABLE (1 << 0)
#define CORE_TESTBUS_CONFIG 0x0CC
#define CORE_TESTBUS_ENA (1 << 3)
#define CORE_TESTBUS_SEL2 (1 << 4)
/*
* Waiting until end of potential AHB access for data:
* 16 AHB cycles (160ns for 100MHz and 320ns for 50MHz) +
* delay on AHB (2us) = maximum 2.32us
* Taking x10 times margin
*/
#define CORE_AHB_DATA_DELAY_US 23
/* Waiting until end of potential AHB access for descriptor:
* Single (1 AHB cycle) + delay on AHB bus = max 2us
* INCR4 (4 AHB cycles) + delay on AHB bus = max 2us
* Single (1 AHB cycle) + delay on AHB bus = max 2us
* Total 8 us delay with margin
*/
#define CORE_AHB_DESC_DELAY_US 8
#define CORE_SDCC_DEBUG_REG 0x124
#define CORE_DEBUG_REG_AHB_HTRANS (3 << 12)
/* 8KB descriptors */
#define SDHCI_MSM_MAX_SEGMENTS (1 << 13)
#define SDHCI_MSM_MMC_CLK_GATE_DELAY 200 /* msecs */
static const u32 tuning_block_64[] = {
0x00FF0FFF, 0xCCC3CCFF, 0xFFCC3CC3, 0xEFFEFFFE,
0xDDFFDFFF, 0xFBFFFBFF, 0xFF7FFFBF, 0xEFBDF777,
0xF0FFF0FF, 0x3CCCFC0F, 0xCFCC33CC, 0xEEFFEFFF,
0xFDFFFDFF, 0xFFBFFFDF, 0xFFF7FFBB, 0xDE7B7FF7
};
static const u32 tuning_block_128[] = {
0xFF00FFFF, 0x0000FFFF, 0xCCCCFFFF, 0xCCCC33CC,
0xCC3333CC, 0xFFFFCCCC, 0xFFFFEEFF, 0xFFEEEEFF,
0xFFDDFFFF, 0xDDDDFFFF, 0xBBFFFFFF, 0xBBFFFFFF,
0xFFFFFFBB, 0xFFFFFF77, 0x77FF7777, 0xFFEEDDBB,
0x00FFFFFF, 0x00FFFFFF, 0xCCFFFF00, 0xCC33CCCC,
0x3333CCCC, 0xFFCCCCCC, 0xFFEEFFFF, 0xEEEEFFFF,
0xDDFFFFFF, 0xDDFFFFFF, 0xFFFFFFDD, 0xFFFFFFBB,
0xFFFFBBBB, 0xFFFF77FF, 0xFF7777FF, 0xEEDDBB77
};
static int disable_slots;
/* root can write, others read */
module_param(disable_slots, int, S_IRUGO|S_IWUSR);
/* This structure keeps information per regulator */
struct sdhci_msm_reg_data {
/* voltage regulator handle */
struct regulator *reg;
/* regulator name */
const char *name;
/* voltage level to be set */
u32 low_vol_level;
u32 high_vol_level;
/* Load values for low power and high power mode */
u32 lpm_uA;
u32 hpm_uA;
/* is this regulator enabled? */
bool is_enabled;
/* is this regulator needs to be always on? */
bool is_always_on;
/* is low power mode setting required for this regulator? */
bool lpm_sup;
};
/*
* This structure keeps information for all the
* regulators required for a SDCC slot.
*/
struct sdhci_msm_slot_reg_data {
/* keeps VDD/VCC regulator info */
struct sdhci_msm_reg_data *vdd_data;
/* keeps VDD IO regulator info */
struct sdhci_msm_reg_data *vdd_io_data;
};
struct sdhci_msm_gpio {
u32 no;
const char *name;
bool is_enabled;
};
struct sdhci_msm_gpio_data {
struct sdhci_msm_gpio *gpio;
u8 size;
};
struct sdhci_msm_pad_pull {
enum msm_tlmm_pull_tgt no;
u32 val;
};
struct sdhci_msm_pad_pull_data {
struct sdhci_msm_pad_pull *on;
struct sdhci_msm_pad_pull *off;
u8 size;
};
struct sdhci_msm_pad_drv {
enum msm_tlmm_hdrive_tgt no;
u32 val;
};
struct sdhci_msm_pad_drv_data {
struct sdhci_msm_pad_drv *on;
struct sdhci_msm_pad_drv *off;
u8 size;
};
struct sdhci_msm_pad_data {
struct sdhci_msm_pad_pull_data *pull;
struct sdhci_msm_pad_drv_data *drv;
};
struct sdhci_msm_pin_data {
/*
* = 1 if controller pins are using gpios
* = 0 if controller has dedicated MSM pads
*/
u8 is_gpio;
bool cfg_sts;
struct sdhci_msm_gpio_data *gpio_data;
struct sdhci_msm_pad_data *pad_data;
};
struct sdhci_msm_bus_voting_data {
struct msm_bus_scale_pdata *bus_pdata;
unsigned int *bw_vecs;
unsigned int bw_vecs_size;
};
struct sdhci_msm_pltfm_data {
/* Supported UHS-I Modes */
u32 caps;
/* More capabilities */
u32 caps2;
unsigned long mmc_bus_width;
struct sdhci_msm_slot_reg_data *vreg_data;
bool nonremovable;
struct sdhci_msm_pin_data *pin_data;
u32 cpu_dma_latency_us;
int status_gpio; /* card detection GPIO that is configured as IRQ */
struct sdhci_msm_bus_voting_data *voting_data;
u32 *sup_clk_table;
unsigned char sup_clk_cnt;
};
struct sdhci_msm_bus_vote {
uint32_t client_handle;
uint32_t curr_vote;
int min_bw_vote;
int max_bw_vote;
bool is_max_bw_needed;
struct delayed_work vote_work;
struct device_attribute max_bus_bw;
};
struct sdhci_msm_host {
struct platform_device *pdev;
void __iomem *core_mem; /* MSM SDCC mapped address */
int pwr_irq; /* power irq */
struct clk *clk; /* main SD/MMC bus clock */
struct clk *pclk; /* SDHC peripheral bus clock */
struct clk *bus_clk; /* SDHC bus voter clock */
atomic_t clks_on; /* Set if clocks are enabled */
struct sdhci_msm_pltfm_data *pdata;
struct mmc_host *mmc;
struct sdhci_pltfm_data sdhci_msm_pdata;
u32 curr_pwr_state;
u32 curr_io_level;
struct completion pwr_irq_completion;
struct sdhci_msm_bus_vote msm_bus_vote;
u32 clk_rate; /* Keeps track of current clock rate that is set */
};
enum vdd_io_level {
/* set vdd_io_data->low_vol_level */
VDD_IO_LOW,
/* set vdd_io_data->high_vol_level */
VDD_IO_HIGH,
/*
* set whatever there in voltage_level (third argument) of
* sdhci_msm_set_vdd_io_vol() function.
*/
VDD_IO_SET_LEVEL,
};
/* MSM platform specific tuning */
static inline int msm_dll_poll_ck_out_en(struct sdhci_host *host,
u8 poll)
{
int rc = 0;
u32 wait_cnt = 50;
u8 ck_out_en = 0;
struct mmc_host *mmc = host->mmc;
/* poll for CK_OUT_EN bit. max. poll time = 50us */
ck_out_en = !!(readl_relaxed(host->ioaddr + CORE_DLL_CONFIG) &
CORE_CK_OUT_EN);
while (ck_out_en != poll) {
if (--wait_cnt == 0) {
pr_err("%s: %s: CK_OUT_EN bit is not %d\n",
mmc_hostname(mmc), __func__, poll);
rc = -ETIMEDOUT;
goto out;
}
udelay(1);
ck_out_en = !!(readl_relaxed(host->ioaddr +
CORE_DLL_CONFIG) & CORE_CK_OUT_EN);
}
out:
return rc;
}
static int msm_config_cm_dll_phase(struct sdhci_host *host, u8 phase)
{
int rc = 0;
u8 grey_coded_phase_table[] = {0x0, 0x1, 0x3, 0x2, 0x6, 0x7, 0x5, 0x4,
0xC, 0xD, 0xF, 0xE, 0xA, 0xB, 0x9,
0x8};
unsigned long flags;
u32 config;
struct mmc_host *mmc = host->mmc;
pr_debug("%s: Enter %s\n", mmc_hostname(mmc), __func__);
spin_lock_irqsave(&host->lock, flags);
config = readl_relaxed(host->ioaddr + CORE_DLL_CONFIG);
config &= ~(CORE_CDR_EN | CORE_CK_OUT_EN);
config |= (CORE_CDR_EXT_EN | CORE_DLL_EN);
writel_relaxed(config, host->ioaddr + CORE_DLL_CONFIG);
/* Wait until CK_OUT_EN bit of DLL_CONFIG register becomes '0' */
rc = msm_dll_poll_ck_out_en(host, 0);
if (rc)
goto err_out;
/*
* Write the selected DLL clock output phase (0 ... 15)
* to CDR_SELEXT bit field of DLL_CONFIG register.
*/
writel_relaxed(((readl_relaxed(host->ioaddr + CORE_DLL_CONFIG)
& ~(0xF << 20))
| (grey_coded_phase_table[phase] << 20)),
host->ioaddr + CORE_DLL_CONFIG);
/* Set CK_OUT_EN bit of DLL_CONFIG register to 1. */
writel_relaxed((readl_relaxed(host->ioaddr + CORE_DLL_CONFIG)
| CORE_CK_OUT_EN), host->ioaddr + CORE_DLL_CONFIG);
/* Wait until CK_OUT_EN bit of DLL_CONFIG register becomes '1' */
rc = msm_dll_poll_ck_out_en(host, 1);
if (rc)
goto err_out;
config = readl_relaxed(host->ioaddr + CORE_DLL_CONFIG);
config |= CORE_CDR_EN;
config &= ~CORE_CDR_EXT_EN;
writel_relaxed(config, host->ioaddr + CORE_DLL_CONFIG);
goto out;
err_out:
pr_err("%s: %s: Failed to set DLL phase: %d\n",
mmc_hostname(mmc), __func__, phase);
out:
spin_unlock_irqrestore(&host->lock, flags);
pr_debug("%s: Exit %s\n", mmc_hostname(mmc), __func__);
return rc;
}
/*
* Find out the greatest range of consecuitive selected
* DLL clock output phases that can be used as sampling
* setting for SD3.0 UHS-I card read operation (in SDR104
* timing mode) or for eMMC4.5 card read operation (in HS200
* timing mode).
* Select the 3/4 of the range and configure the DLL with the
* selected DLL clock output phase.
*/
static int msm_find_most_appropriate_phase(struct sdhci_host *host,
u8 *phase_table, u8 total_phases)
{
int ret;
u8 ranges[MAX_PHASES][MAX_PHASES] = { {0}, {0} };
u8 phases_per_row[MAX_PHASES] = {0};
int row_index = 0, col_index = 0, selected_row_index = 0, curr_max = 0;
int i, cnt, phase_0_raw_index = 0, phase_15_raw_index = 0;
bool phase_0_found = false, phase_15_found = false;
struct mmc_host *mmc = host->mmc;
pr_debug("%s: Enter %s\n", mmc_hostname(mmc), __func__);
if (!total_phases || (total_phases > MAX_PHASES)) {
pr_err("%s: %s: invalid argument: total_phases=%d\n",
mmc_hostname(mmc), __func__, total_phases);
return -EINVAL;
}
for (cnt = 0; cnt < total_phases; cnt++) {
ranges[row_index][col_index] = phase_table[cnt];
phases_per_row[row_index] += 1;
col_index++;
if ((cnt + 1) == total_phases) {
continue;
/* check if next phase in phase_table is consecutive or not */
} else if ((phase_table[cnt] + 1) != phase_table[cnt + 1]) {
row_index++;
col_index = 0;
}
}
if (row_index >= MAX_PHASES)
return -EINVAL;
/* Check if phase-0 is present in first valid window? */
if (!ranges[0][0]) {
phase_0_found = true;
phase_0_raw_index = 0;
/* Check if cycle exist between 2 valid windows */
for (cnt = 1; cnt <= row_index; cnt++) {
if (phases_per_row[cnt]) {
for (i = 0; i < phases_per_row[cnt]; i++) {
if (ranges[cnt][i] == 15) {
phase_15_found = true;
phase_15_raw_index = cnt;
break;
}
}
}
}
}
/* If 2 valid windows form cycle then merge them as single window */
if (phase_0_found && phase_15_found) {
/* number of phases in raw where phase 0 is present */
u8 phases_0 = phases_per_row[phase_0_raw_index];
/* number of phases in raw where phase 15 is present */
u8 phases_15 = phases_per_row[phase_15_raw_index];
if (phases_0 + phases_15 >= MAX_PHASES)
/*
* If there are more than 1 phase windows then total
* number of phases in both the windows should not be
* more than or equal to MAX_PHASES.
*/
return -EINVAL;
/* Merge 2 cyclic windows */
i = phases_15;
for (cnt = 0; cnt < phases_0; cnt++) {
ranges[phase_15_raw_index][i] =
ranges[phase_0_raw_index][cnt];
if (++i >= MAX_PHASES)
break;
}
phases_per_row[phase_0_raw_index] = 0;
phases_per_row[phase_15_raw_index] = phases_15 + phases_0;
}
for (cnt = 0; cnt <= row_index; cnt++) {
if (phases_per_row[cnt] > curr_max) {
curr_max = phases_per_row[cnt];
selected_row_index = cnt;
}
}
i = ((curr_max * 3) / 4);
if (i)
i--;
ret = (int)ranges[selected_row_index][i];
if (ret >= MAX_PHASES) {
ret = -EINVAL;
pr_err("%s: %s: invalid phase selected=%d\n",
mmc_hostname(mmc), __func__, ret);
}
pr_debug("%s: Exit %s\n", mmc_hostname(mmc), __func__);
return ret;
}
static inline void msm_cm_dll_set_freq(struct sdhci_host *host)
{
u32 mclk_freq = 0;
/* Program the MCLK value to MCLK_FREQ bit field */
if (host->clock <= 112000000)
mclk_freq = 0;
else if (host->clock <= 125000000)
mclk_freq = 1;
else if (host->clock <= 137000000)
mclk_freq = 2;
else if (host->clock <= 150000000)
mclk_freq = 3;
else if (host->clock <= 162000000)
mclk_freq = 4;
else if (host->clock <= 175000000)
mclk_freq = 5;
else if (host->clock <= 187000000)
mclk_freq = 6;
else if (host->clock <= 200000000)
mclk_freq = 7;
writel_relaxed(((readl_relaxed(host->ioaddr + CORE_DLL_CONFIG)
& ~(7 << 24)) | (mclk_freq << 24)),
host->ioaddr + CORE_DLL_CONFIG);
}
/* Initialize the DLL (Programmable Delay Line ) */
static int msm_init_cm_dll(struct sdhci_host *host)
{
struct mmc_host *mmc = host->mmc;
int rc = 0;
unsigned long flags;
u32 wait_cnt;
pr_debug("%s: Enter %s\n", mmc_hostname(mmc), __func__);
spin_lock_irqsave(&host->lock, flags);
/*
* Make sure that clock is always enabled when DLL
* tuning is in progress. Keeping PWRSAVE ON may
* turn off the clock. So let's disable the PWRSAVE
* here and re-enable it once tuning is completed.
*/
writel_relaxed((readl_relaxed(host->ioaddr + CORE_VENDOR_SPEC)
& ~CORE_CLK_PWRSAVE),
host->ioaddr + CORE_VENDOR_SPEC);
/* Write 1 to DLL_RST bit of DLL_CONFIG register */
writel_relaxed((readl_relaxed(host->ioaddr + CORE_DLL_CONFIG)
| CORE_DLL_RST), host->ioaddr + CORE_DLL_CONFIG);
/* Write 1 to DLL_PDN bit of DLL_CONFIG register */
writel_relaxed((readl_relaxed(host->ioaddr + CORE_DLL_CONFIG)
| CORE_DLL_PDN), host->ioaddr + CORE_DLL_CONFIG);
msm_cm_dll_set_freq(host);
/* Write 0 to DLL_RST bit of DLL_CONFIG register */
writel_relaxed((readl_relaxed(host->ioaddr + CORE_DLL_CONFIG)
& ~CORE_DLL_RST), host->ioaddr + CORE_DLL_CONFIG);
/* Write 0 to DLL_PDN bit of DLL_CONFIG register */
writel_relaxed((readl_relaxed(host->ioaddr + CORE_DLL_CONFIG)
& ~CORE_DLL_PDN), host->ioaddr + CORE_DLL_CONFIG);
/* Set DLL_EN bit to 1. */
writel_relaxed((readl_relaxed(host->ioaddr + CORE_DLL_CONFIG)
| CORE_DLL_EN), host->ioaddr + CORE_DLL_CONFIG);
/* Set CK_OUT_EN bit to 1. */
writel_relaxed((readl_relaxed(host->ioaddr + CORE_DLL_CONFIG)
| CORE_CK_OUT_EN), host->ioaddr + CORE_DLL_CONFIG);
wait_cnt = 50;
/* Wait until DLL_LOCK bit of DLL_STATUS register becomes '1' */
while (!(readl_relaxed(host->ioaddr + CORE_DLL_STATUS) &
CORE_DLL_LOCK)) {
/* max. wait for 50us sec for LOCK bit to be set */
if (--wait_cnt == 0) {
pr_err("%s: %s: DLL failed to LOCK\n",
mmc_hostname(mmc), __func__);
rc = -ETIMEDOUT;
goto out;
}
/* wait for 1us before polling again */
udelay(1);
}
out:
/* re-enable PWRSAVE */
writel_relaxed((readl_relaxed(host->ioaddr + CORE_VENDOR_SPEC) |
CORE_CLK_PWRSAVE),
host->ioaddr + CORE_VENDOR_SPEC);
spin_unlock_irqrestore(&host->lock, flags);
pr_debug("%s: Exit %s\n", mmc_hostname(mmc), __func__);
return rc;
}
int sdhci_msm_execute_tuning(struct sdhci_host *host, u32 opcode)
{
unsigned long flags;
u8 phase, *data_buf, tuned_phases[16], tuned_phase_cnt = 0;
const u32 *tuning_block_pattern = tuning_block_64;
int size = sizeof(tuning_block_64); /* Tuning pattern size in bytes */
int rc;
struct mmc_host *mmc = host->mmc;
struct mmc_ios ios = host->mmc->ios;
/*
* Tuning is required for SDR104 and HS200 cards and if clock frequency
* is greater than 100MHz in these modes.
*/
if (host->clock <= (100 * 1000 * 1000) ||
!(ios.timing == MMC_TIMING_MMC_HS200 ||
ios.timing == MMC_TIMING_UHS_SDR104))
return 0;
pr_debug("%s: Enter %s\n", mmc_hostname(mmc), __func__);
spin_lock_irqsave(&host->lock, flags);
if ((opcode == MMC_SEND_TUNING_BLOCK_HS200) &&
(mmc->ios.bus_width == MMC_BUS_WIDTH_8)) {
tuning_block_pattern = tuning_block_128;
size = sizeof(tuning_block_128);
}
spin_unlock_irqrestore(&host->lock, flags);
/* first of all reset the tuning block */
rc = msm_init_cm_dll(host);
if (rc)
goto out;
data_buf = kmalloc(size, GFP_KERNEL);
if (!data_buf) {
rc = -ENOMEM;
goto out;
}
phase = 0;
do {
struct mmc_command cmd = {0};
struct mmc_data data = {0};
struct mmc_request mrq = {
.cmd = &cmd,
.data = &data
};
struct scatterlist sg;
/* set the phase in delay line hw block */
rc = msm_config_cm_dll_phase(host, phase);
if (rc)
goto kfree;
cmd.opcode = opcode;
cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
data.blksz = size;
data.blocks = 1;
data.flags = MMC_DATA_READ;
data.timeout_ns = 1000 * 1000 * 1000; /* 1 sec */
data.sg = &sg;
data.sg_len = 1;
sg_init_one(&sg, data_buf, size);
memset(data_buf, 0, size);
mmc_wait_for_req(mmc, &mrq);
if (!cmd.error && !data.error &&
!memcmp(data_buf, tuning_block_pattern, size)) {
/* tuning is successful at this tuning point */
tuned_phases[tuned_phase_cnt++] = phase;
pr_debug("%s: %s: found good phase = %d\n",
mmc_hostname(mmc), __func__, phase);
}
} while (++phase < 16);
if (tuned_phase_cnt) {
rc = msm_find_most_appropriate_phase(host, tuned_phases,
tuned_phase_cnt);
if (rc < 0)
goto kfree;
else
phase = (u8)rc;
/*
* Finally set the selected phase in delay
* line hw block.
*/
rc = msm_config_cm_dll_phase(host, phase);
if (rc)
goto kfree;
pr_debug("%s: %s: finally setting the tuning phase to %d\n",
mmc_hostname(mmc), __func__, phase);
} else {
/* tuning failed */
pr_err("%s: %s: no tuning point found\n",
mmc_hostname(mmc), __func__);
rc = -EAGAIN;
}
kfree:
kfree(data_buf);
out:
pr_debug("%s: Exit %s\n", mmc_hostname(mmc), __func__);
return rc;
}
static int sdhci_msm_setup_gpio(struct sdhci_msm_pltfm_data *pdata, bool enable)
{
struct sdhci_msm_gpio_data *curr;
int i, ret = 0;
curr = pdata->pin_data->gpio_data;
for (i = 0; i < curr->size; i++) {
if (!gpio_is_valid(curr->gpio[i].no)) {
ret = -EINVAL;
pr_err("%s: Invalid gpio = %d\n", __func__,
curr->gpio[i].no);
goto free_gpios;
}
if (enable) {
ret = gpio_request(curr->gpio[i].no,
curr->gpio[i].name);
if (ret) {
pr_err("%s: gpio_request(%d, %s) failed %d\n",
__func__, curr->gpio[i].no,
curr->gpio[i].name, ret);
goto free_gpios;
}
curr->gpio[i].is_enabled = true;
} else {
gpio_free(curr->gpio[i].no);
curr->gpio[i].is_enabled = false;
}
}
return ret;
free_gpios:
for (i--; i >= 0; i--) {
gpio_free(curr->gpio[i].no);
curr->gpio[i].is_enabled = false;
}
return ret;
}
static int sdhci_msm_setup_pad(struct sdhci_msm_pltfm_data *pdata, bool enable)
{
struct sdhci_msm_pad_data *curr;
int i;
curr = pdata->pin_data->pad_data;
for (i = 0; i < curr->drv->size; i++) {
if (enable)
msm_tlmm_set_hdrive(curr->drv->on[i].no,
curr->drv->on[i].val);
else
msm_tlmm_set_hdrive(curr->drv->off[i].no,
curr->drv->off[i].val);
}
for (i = 0; i < curr->pull->size; i++) {
if (enable)
msm_tlmm_set_pull(curr->pull->on[i].no,
curr->pull->on[i].val);
else
msm_tlmm_set_pull(curr->pull->off[i].no,
curr->pull->off[i].val);
}
return 0;
}
static int sdhci_msm_setup_pins(struct sdhci_msm_pltfm_data *pdata, bool enable)
{
int ret = 0;
if (!pdata->pin_data || (pdata->pin_data->cfg_sts == enable))
return 0;
if (pdata->pin_data->is_gpio)
ret = sdhci_msm_setup_gpio(pdata, enable);
else
ret = sdhci_msm_setup_pad(pdata, enable);
if (!ret)
pdata->pin_data->cfg_sts = enable;
return ret;
}
static int sdhci_msm_dt_get_array(struct device *dev, const char *prop_name,
u32 **out, int *len, u32 size)
{
int ret = 0;
struct device_node *np = dev->of_node;
size_t sz;
u32 *arr = NULL;
if (!of_get_property(np, prop_name, len)) {
ret = -EINVAL;
goto out;
}
sz = *len = *len / sizeof(*arr);
if (sz <= 0 || (size > 0 && (sz != size))) {
dev_err(dev, "%s invalid size\n", prop_name);
ret = -EINVAL;
goto out;
}
arr = devm_kzalloc(dev, sz * sizeof(*arr), GFP_KERNEL);
if (!arr) {
dev_err(dev, "%s failed allocating memory\n", prop_name);
ret = -ENOMEM;
goto out;
}
ret = of_property_read_u32_array(np, prop_name, arr, sz);
if (ret < 0) {
dev_err(dev, "%s failed reading array %d\n", prop_name, ret);
goto out;
}
*out = arr;
out:
if (ret)
*len = 0;
return ret;
}
#define MAX_PROP_SIZE 32
static int sdhci_msm_dt_parse_vreg_info(struct device *dev,
struct sdhci_msm_reg_data **vreg_data, const char *vreg_name)
{
int len, ret = 0;
const __be32 *prop;
char prop_name[MAX_PROP_SIZE];
struct sdhci_msm_reg_data *vreg;
struct device_node *np = dev->of_node;
snprintf(prop_name, MAX_PROP_SIZE, "%s-supply", vreg_name);
if (!of_parse_phandle(np, prop_name, 0)) {
dev_err(dev, "No vreg data found for %s\n", vreg_name);
ret = -EINVAL;
return ret;
}
vreg = devm_kzalloc(dev, sizeof(*vreg), GFP_KERNEL);
if (!vreg) {
dev_err(dev, "No memory for vreg: %s\n", vreg_name);
ret = -ENOMEM;
return ret;
}
vreg->name = vreg_name;
snprintf(prop_name, MAX_PROP_SIZE,
"qcom,%s-always-on", vreg_name);
if (of_get_property(np, prop_name, NULL))
vreg->is_always_on = true;
snprintf(prop_name, MAX_PROP_SIZE,
"qcom,%s-lpm-sup", vreg_name);
if (of_get_property(np, prop_name, NULL))
vreg->lpm_sup = true;
snprintf(prop_name, MAX_PROP_SIZE,
"qcom,%s-voltage-level", vreg_name);
prop = of_get_property(np, prop_name, &len);
if (!prop || (len != (2 * sizeof(__be32)))) {
dev_warn(dev, "%s %s property\n",
prop ? "invalid format" : "no", prop_name);
} else {
vreg->low_vol_level = be32_to_cpup(&prop[0]);
vreg->high_vol_level = be32_to_cpup(&prop[1]);
}
snprintf(prop_name, MAX_PROP_SIZE,
"qcom,%s-current-level", vreg_name);
prop = of_get_property(np, prop_name, &len);
if (!prop || (len != (2 * sizeof(__be32)))) {
dev_warn(dev, "%s %s property\n",
prop ? "invalid format" : "no", prop_name);
} else {
vreg->lpm_uA = be32_to_cpup(&prop[0]);
vreg->hpm_uA = be32_to_cpup(&prop[1]);
}
*vreg_data = vreg;
dev_dbg(dev, "%s: %s %s vol=[%d %d]uV, curr=[%d %d]uA\n",
vreg->name, vreg->is_always_on ? "always_on," : "",
vreg->lpm_sup ? "lpm_sup," : "", vreg->low_vol_level,
vreg->high_vol_level, vreg->lpm_uA, vreg->hpm_uA);
return ret;
}
/* GPIO/Pad data extraction */
static int sdhci_msm_dt_get_pad_pull_info(struct device *dev, int id,
struct sdhci_msm_pad_pull_data **pad_pull_data)
{
int ret = 0, base = 0, len, i;
u32 *tmp;
struct sdhci_msm_pad_pull_data *pull_data;
struct sdhci_msm_pad_pull *pull;
switch (id) {
case 1:
base = TLMM_PULL_SDC1_CLK;
break;
case 2:
base = TLMM_PULL_SDC2_CLK;
break;
case 3:
base = TLMM_PULL_SDC3_CLK;
break;
case 4:
base = TLMM_PULL_SDC4_CLK;
break;
default:
dev_err(dev, "%s: Invalid slot id\n", __func__);
ret = -EINVAL;
goto out;
}
pull_data = devm_kzalloc(dev, sizeof(struct sdhci_msm_pad_pull_data),
GFP_KERNEL);
if (!pull_data) {
dev_err(dev, "No memory for msm_mmc_pad_pull_data\n");
ret = -ENOMEM;
goto out;
}
pull_data->size = 3; /* array size for clk, cmd, data */
/* Allocate on, off configs for clk, cmd, data */
pull = devm_kzalloc(dev, 2 * pull_data->size *\
sizeof(struct sdhci_msm_pad_pull), GFP_KERNEL);
if (!pull) {
dev_err(dev, "No memory for msm_mmc_pad_pull\n");
ret = -ENOMEM;
goto out;
}
pull_data->on = pull;
pull_data->off = pull + pull_data->size;
ret = sdhci_msm_dt_get_array(dev, "qcom,pad-pull-on",
&tmp, &len, pull_data->size);
if (ret)
goto out;
for (i = 0; i < len; i++) {
pull_data->on[i].no = base + i;
pull_data->on[i].val = tmp[i];
dev_dbg(dev, "%s: val[%d]=0x%x\n", __func__,
i, pull_data->on[i].val);
}
ret = sdhci_msm_dt_get_array(dev, "qcom,pad-pull-off",
&tmp, &len, pull_data->size);
if (ret)
goto out;
for (i = 0; i < len; i++) {
pull_data->off[i].no = base + i;
pull_data->off[i].val = tmp[i];
dev_dbg(dev, "%s: val[%d]=0x%x\n", __func__,
i, pull_data->off[i].val);
}
*pad_pull_data = pull_data;
out:
return ret;
}
static int sdhci_msm_dt_get_pad_drv_info(struct device *dev, int id,
struct sdhci_msm_pad_drv_data **pad_drv_data)
{
int ret = 0, base = 0, len, i;
u32 *tmp;
struct sdhci_msm_pad_drv_data *drv_data;
struct sdhci_msm_pad_drv *drv;
switch (id) {
case 1:
base = TLMM_HDRV_SDC1_CLK;
break;
case 2:
base = TLMM_HDRV_SDC2_CLK;
break;
case 3:
base = TLMM_HDRV_SDC3_CLK;
break;
case 4:
base = TLMM_HDRV_SDC4_CLK;
break;
default:
dev_err(dev, "%s: Invalid slot id\n", __func__);
ret = -EINVAL;
goto out;
}
drv_data = devm_kzalloc(dev, sizeof(struct sdhci_msm_pad_drv_data),
GFP_KERNEL);
if (!drv_data) {
dev_err(dev, "No memory for msm_mmc_pad_drv_data\n");
ret = -ENOMEM;
goto out;
}
drv_data->size = 3; /* array size for clk, cmd, data */
/* Allocate on, off configs for clk, cmd, data */
drv = devm_kzalloc(dev, 2 * drv_data->size *\
sizeof(struct sdhci_msm_pad_drv), GFP_KERNEL);
if (!drv) {
dev_err(dev, "No memory msm_mmc_pad_drv\n");
ret = -ENOMEM;
goto out;
}
drv_data->on = drv;
drv_data->off = drv + drv_data->size;
ret = sdhci_msm_dt_get_array(dev, "qcom,pad-drv-on",
&tmp, &len, drv_data->size);
if (ret)
goto out;
for (i = 0; i < len; i++) {
drv_data->on[i].no = base + i;
drv_data->on[i].val = tmp[i];
dev_dbg(dev, "%s: val[%d]=0x%x\n", __func__,
i, drv_data->on[i].val);
}
ret = sdhci_msm_dt_get_array(dev, "qcom,pad-drv-off",
&tmp, &len, drv_data->size);
if (ret)
goto out;
for (i = 0; i < len; i++) {
drv_data->off[i].no = base + i;
drv_data->off[i].val = tmp[i];
dev_dbg(dev, "%s: val[%d]=0x%x\n", __func__,
i, drv_data->off[i].val);
}
*pad_drv_data = drv_data;
out:
return ret;
}
#define GPIO_NAME_MAX_LEN 32
static int sdhci_msm_dt_parse_gpio_info(struct device *dev,
struct sdhci_msm_pltfm_data *pdata)
{
int ret = 0, id = 0, cnt, i;
struct sdhci_msm_pin_data *pin_data;
struct device_node *np = dev->of_node;
pin_data = devm_kzalloc(dev, sizeof(*pin_data), GFP_KERNEL);
if (!pin_data) {
dev_err(dev, "No memory for pin_data\n");
ret = -ENOMEM;
goto out;
}
cnt = of_gpio_count(np);
if (cnt > 0) {
pin_data->is_gpio = true;
pin_data->gpio_data = devm_kzalloc(dev,
sizeof(struct sdhci_msm_gpio_data), GFP_KERNEL);
if (!pin_data->gpio_data) {
dev_err(dev, "No memory for gpio_data\n");
ret = -ENOMEM;
goto out;
}
pin_data->gpio_data->size = cnt;
pin_data->gpio_data->gpio = devm_kzalloc(dev, cnt *
sizeof(struct sdhci_msm_gpio), GFP_KERNEL);
if (!pin_data->gpio_data->gpio) {
dev_err(dev, "No memory for gpio\n");
ret = -ENOMEM;
goto out;
}
for (i = 0; i < cnt; i++) {
const char *name = NULL;
char result[GPIO_NAME_MAX_LEN];
pin_data->gpio_data->gpio[i].no = of_get_gpio(np, i);
of_property_read_string_index(np,
"qcom,gpio-names", i, &name);
snprintf(result, GPIO_NAME_MAX_LEN, "%s-%s",
dev_name(dev), name ? name : "?");
pin_data->gpio_data->gpio[i].name = result;
dev_dbg(dev, "%s: gpio[%s] = %d\n", __func__,
pin_data->gpio_data->gpio[i].name,
pin_data->gpio_data->gpio[i].no);
}
} else {
pin_data->pad_data =
devm_kzalloc(dev,
sizeof(struct sdhci_msm_pad_data),
GFP_KERNEL);
if (!pin_data->pad_data) {
dev_err(dev,
"No memory for pin_data->pad_data\n");
ret = -ENOMEM;
goto out;
}
ret = of_alias_get_id(np, "sdhc");
if (ret < 0) {
dev_err(dev, "Failed to get slot index %d\n", ret);
goto out;
}
id = ret;
ret = sdhci_msm_dt_get_pad_pull_info(
dev, id, &pin_data->pad_data->pull);
if (ret)
goto out;
ret = sdhci_msm_dt_get_pad_drv_info(
dev, id, &pin_data->pad_data->drv);
if (ret)
goto out;
}
pdata->pin_data = pin_data;
out:
if (ret)
dev_err(dev, "%s failed with err %d\n", __func__, ret);
return ret;
}
/* Parse platform data */
static struct sdhci_msm_pltfm_data *sdhci_msm_populate_pdata(struct device *dev)
{
struct sdhci_msm_pltfm_data *pdata = NULL;
struct device_node *np = dev->of_node;
u32 bus_width = 0;
u32 cpu_dma_latency;
int len, i;
int clk_table_len;
u32 *clk_table = NULL;
enum of_gpio_flags flags = OF_GPIO_ACTIVE_LOW;
pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
if (!pdata) {
dev_err(dev, "failed to allocate memory for platform data\n");
goto out;
}
pdata->status_gpio = of_get_named_gpio_flags(np, "cd-gpios", 0, &flags);
if (gpio_is_valid(pdata->status_gpio) & !(flags & OF_GPIO_ACTIVE_LOW))
pdata->caps2 |= MMC_CAP2_CD_ACTIVE_HIGH;
of_property_read_u32(np, "qcom,bus-width", &bus_width);
if (bus_width == 8)
pdata->mmc_bus_width = MMC_CAP_8_BIT_DATA;
else if (bus_width == 4)
pdata->mmc_bus_width = MMC_CAP_4_BIT_DATA;
else {
dev_notice(dev, "invalid bus-width, default to 1-bit mode\n");
pdata->mmc_bus_width = 0;
}
if (!of_property_read_u32(np, "qcom,cpu-dma-latency-us",
&cpu_dma_latency))
pdata->cpu_dma_latency_us = cpu_dma_latency;
if (sdhci_msm_dt_get_array(dev, "qcom,clk-rates",
&clk_table, &clk_table_len, 0)) {
dev_err(dev, "failed parsing supported clock rates\n");
goto out;
}
if (!clk_table || !clk_table_len) {
dev_err(dev, "Invalid clock table\n");
goto out;
}
pdata->sup_clk_table = clk_table;
pdata->sup_clk_cnt = clk_table_len;
pdata->vreg_data = devm_kzalloc(dev, sizeof(struct
sdhci_msm_slot_reg_data),
GFP_KERNEL);
if (!pdata->vreg_data) {
dev_err(dev, "failed to allocate memory for vreg data\n");
goto out;
}
if (sdhci_msm_dt_parse_vreg_info(dev, &pdata->vreg_data->vdd_data,
"vdd")) {
dev_err(dev, "failed parsing vdd data\n");
goto out;
}
if (sdhci_msm_dt_parse_vreg_info(dev,
&pdata->vreg_data->vdd_io_data,
"vdd-io")) {
dev_err(dev, "failed parsing vdd-io data\n");
goto out;
}
if (sdhci_msm_dt_parse_gpio_info(dev, pdata)) {
dev_err(dev, "failed parsing gpio data\n");
goto out;
}
len = of_property_count_strings(np, "qcom,bus-speed-mode");
for (i = 0; i < len; i++) {
const char *name = NULL;
of_property_read_string_index(np,
"qcom,bus-speed-mode", i, &name);
if (!name)
continue;
if (!strncmp(name, "HS200_1p8v", sizeof("HS200_1p8v")))
pdata->caps2 |= MMC_CAP2_HS200_1_8V_SDR;
else if (!strncmp(name, "HS200_1p2v", sizeof("HS200_1p2v")))
pdata->caps2 |= MMC_CAP2_HS200_1_2V_SDR;
else if (!strncmp(name, "DDR_1p8v", sizeof("DDR_1p8v")))
pdata->caps |= MMC_CAP_1_8V_DDR
| MMC_CAP_UHS_DDR50;
else if (!strncmp(name, "DDR_1p2v", sizeof("DDR_1p2v")))
pdata->caps |= MMC_CAP_1_2V_DDR
| MMC_CAP_UHS_DDR50;
}
if (of_get_property(np, "qcom,nonremovable", NULL))
pdata->nonremovable = true;
return pdata;
out:
return NULL;
}
/* Returns required bandwidth in Bytes per Sec */
static unsigned int sdhci_get_bw_required(struct sdhci_host *host,
struct mmc_ios *ios)
{
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct sdhci_msm_host *msm_host = pltfm_host->priv;
unsigned int bw;
bw = msm_host->clk_rate;
/*
* For DDR mode, SDCC controller clock will be at
* the double rate than the actual clock that goes to card.
*/
if (ios->bus_width == MMC_BUS_WIDTH_4)
bw /= 2;
else if (ios->bus_width == MMC_BUS_WIDTH_1)
bw /= 8;
return bw;
}
static int sdhci_msm_bus_get_vote_for_bw(struct sdhci_msm_host *host,
unsigned int bw)
{
unsigned int *table = host->pdata->voting_data->bw_vecs;
unsigned int size = host->pdata->voting_data->bw_vecs_size;
int i;
if (host->msm_bus_vote.is_max_bw_needed && bw)
return host->msm_bus_vote.max_bw_vote;
for (i = 0; i < size; i++) {
if (bw <= table[i])
break;
}
if (i && (i == size))
i--;
return i;
}
/*
* This function must be called with host lock acquired.
* Caller of this function should also ensure that msm bus client
* handle is not null.
*/
static inline int sdhci_msm_bus_set_vote(struct sdhci_msm_host *msm_host,
int vote,
unsigned long flags)
{
struct sdhci_host *host = platform_get_drvdata(msm_host->pdev);
int rc = 0;
if (vote != msm_host->msm_bus_vote.curr_vote) {
spin_unlock_irqrestore(&host->lock, flags);
rc = msm_bus_scale_client_update_request(
msm_host->msm_bus_vote.client_handle, vote);
spin_lock_irqsave(&host->lock, flags);
if (rc) {
pr_err("%s: msm_bus_scale_client_update_request() failed: bus_client_handle=0x%x, vote=%d, err=%d\n",
mmc_hostname(host->mmc),
msm_host->msm_bus_vote.client_handle, vote, rc);
goto out;
}
msm_host->msm_bus_vote.curr_vote = vote;
}
out:
return rc;
}
/*
* Internal work. Work to set 0 bandwidth for msm bus.
*/
static void sdhci_msm_bus_work(struct work_struct *work)
{
struct sdhci_msm_host *msm_host;
struct sdhci_host *host;
unsigned long flags;
msm_host = container_of(work, struct sdhci_msm_host,
msm_bus_vote.vote_work.work);
host = platform_get_drvdata(msm_host->pdev);
if (!msm_host->msm_bus_vote.client_handle)
return;
spin_lock_irqsave(&host->lock, flags);
/* don't vote for 0 bandwidth if any request is in progress */
if (!host->mrq) {
sdhci_msm_bus_set_vote(msm_host,
msm_host->msm_bus_vote.min_bw_vote, flags);
} else
pr_warning("%s: %s: Transfer in progress. skipping bus voting to 0 bandwidth\n",
mmc_hostname(host->mmc), __func__);
spin_unlock_irqrestore(&host->lock, flags);
}
/*
* This function cancels any scheduled delayed work and sets the bus
* vote based on bw (bandwidth) argument.
*/
static void sdhci_msm_bus_cancel_work_and_set_vote(struct sdhci_host *host,
unsigned int bw)
{
int vote;
unsigned long flags;
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct sdhci_msm_host *msm_host = pltfm_host->priv;
cancel_delayed_work_sync(&msm_host->msm_bus_vote.vote_work);
spin_lock_irqsave(&host->lock, flags);
vote = sdhci_msm_bus_get_vote_for_bw(msm_host, bw);
sdhci_msm_bus_set_vote(msm_host, vote, flags);
spin_unlock_irqrestore(&host->lock, flags);
}
#define MSM_MMC_BUS_VOTING_DELAY 200 /* msecs */
/* This function queues a work which will set the bandwidth requiement to 0 */
static void sdhci_msm_bus_queue_work(struct sdhci_host *host)
{
unsigned long flags;
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct sdhci_msm_host *msm_host = pltfm_host->priv;
spin_lock_irqsave(&host->lock, flags);
if (msm_host->msm_bus_vote.min_bw_vote !=
msm_host->msm_bus_vote.curr_vote)
queue_delayed_work(system_nrt_wq,
&msm_host->msm_bus_vote.vote_work,
msecs_to_jiffies(MSM_MMC_BUS_VOTING_DELAY));
spin_unlock_irqrestore(&host->lock, flags);
}
static int sdhci_msm_bus_register(struct sdhci_msm_host *host,
struct platform_device *pdev)
{
int rc = 0;
struct msm_bus_scale_pdata *bus_pdata;
struct sdhci_msm_bus_voting_data *data;
struct device *dev = &pdev->dev;
data = devm_kzalloc(dev,
sizeof(struct sdhci_msm_bus_voting_data), GFP_KERNEL);
if (!data) {
dev_err(&pdev->dev,
"%s: failed to allocate memory\n", __func__);
rc = -ENOMEM;
goto out;
}
data->bus_pdata = msm_bus_cl_get_pdata(pdev);
if (data->bus_pdata) {
rc = sdhci_msm_dt_get_array(dev, "qcom,bus-bw-vectors-bps",
&data->bw_vecs, &data->bw_vecs_size, 0);
if (rc) {
dev_err(&pdev->dev,
"%s: Failed to get bus-bw-vectors-bps\n",
__func__);
goto out;
}
host->pdata->voting_data = data;
}
if (host->pdata->voting_data &&
host->pdata->voting_data->bus_pdata &&
host->pdata->voting_data->bw_vecs &&
host->pdata->voting_data->bw_vecs_size) {
bus_pdata = host->pdata->voting_data->bus_pdata;
host->msm_bus_vote.client_handle =
msm_bus_scale_register_client(bus_pdata);
if (!host->msm_bus_vote.client_handle) {
dev_err(&pdev->dev, "msm_bus_scale_register_client()\n");
rc = -EFAULT;
goto out;
}
/* cache the vote index for minimum and maximum bandwidth */
host->msm_bus_vote.min_bw_vote =
sdhci_msm_bus_get_vote_for_bw(host, 0);
host->msm_bus_vote.max_bw_vote =
sdhci_msm_bus_get_vote_for_bw(host, UINT_MAX);
} else {
devm_kfree(dev, data);
}
out:
return rc;
}
static void sdhci_msm_bus_unregister(struct sdhci_msm_host *host)
{
if (host->msm_bus_vote.client_handle)
msm_bus_scale_unregister_client(
host->msm_bus_vote.client_handle);
}
static void sdhci_msm_bus_voting(struct sdhci_host *host, u32 enable)
{
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct sdhci_msm_host *msm_host = pltfm_host->priv;
struct mmc_ios *ios = &host->mmc->ios;
unsigned int bw;
if (!msm_host->msm_bus_vote.client_handle)
return;
bw = sdhci_get_bw_required(host, ios);
if (enable) {
sdhci_msm_bus_cancel_work_and_set_vote(host, bw);
} else {
/*
* If clock gating is enabled, then remove the vote
* immediately because clocks will be disabled only
* after SDHCI_MSM_MMC_CLK_GATE_DELAY and thus no
* additional delay is required to remove the bus vote.
*/
if (host->mmc->clkgate_delay)
sdhci_msm_bus_cancel_work_and_set_vote(host, 0);
else
sdhci_msm_bus_queue_work(host);
}
}
/* Regulator utility functions */
static int sdhci_msm_vreg_init_reg(struct device *dev,
struct sdhci_msm_reg_data *vreg)
{
int ret = 0;
/* check if regulator is already initialized? */
if (vreg->reg)
goto out;
/* Get the regulator handle */
vreg->reg = devm_regulator_get(dev, vreg->name);
if (IS_ERR(vreg->reg)) {
ret = PTR_ERR(vreg->reg);
pr_err("%s: devm_regulator_get(%s) failed. ret=%d\n",
__func__, vreg->name, ret);
goto out;
}
/* sanity check */
if (!vreg->high_vol_level || !vreg->hpm_uA) {
pr_err("%s: %s invalid constraints specified\n",
__func__, vreg->name);
ret = -EINVAL;
}
out:
return ret;
}
static void sdhci_msm_vreg_deinit_reg(struct sdhci_msm_reg_data *vreg)
{
if (vreg->reg)
devm_regulator_put(vreg->reg);
}
static int sdhci_msm_vreg_set_optimum_mode(struct sdhci_msm_reg_data
*vreg, int uA_load)
{
int ret = 0;
/*
* regulators that do not support regulator_set_voltage also
* do not support regulator_set_optimum_mode
*/
ret = regulator_set_optimum_mode(vreg->reg, uA_load);
if (ret < 0)
pr_err("%s: regulator_set_optimum_mode(reg=%s,uA_load=%d) failed. ret=%d\n",
__func__, vreg->name, uA_load, ret);
else
/*
* regulator_set_optimum_mode() can return non zero
* value even for success case.
*/
ret = 0;
return ret;
}
static int sdhci_msm_vreg_set_voltage(struct sdhci_msm_reg_data *vreg,
int min_uV, int max_uV)
{
int ret = 0;
ret = regulator_set_voltage(vreg->reg, min_uV, max_uV);
if (ret) {
pr_err("%s: regulator_set_voltage(%s)failed. min_uV=%d,max_uV=%d,ret=%d\n",
__func__, vreg->name, min_uV, max_uV, ret);
}
return ret;
}
static int sdhci_msm_vreg_enable(struct sdhci_msm_reg_data *vreg)
{
int ret = 0;
/* Put regulator in HPM (high power mode) */
ret = sdhci_msm_vreg_set_optimum_mode(vreg, vreg->hpm_uA);
if (ret < 0)
return ret;
if (!vreg->is_enabled) {
/* Set voltage level */
ret = sdhci_msm_vreg_set_voltage(vreg, vreg->high_vol_level,
vreg->high_vol_level);
if (ret)
return ret;
}
ret = regulator_enable(vreg->reg);
if (ret) {
pr_err("%s: regulator_enable(%s) failed. ret=%d\n",
__func__, vreg->name, ret);
return ret;
}
vreg->is_enabled = true;
return ret;
}
static int sdhci_msm_vreg_disable(struct sdhci_msm_reg_data *vreg)
{
int ret = 0;
/* Never disable regulator marked as always_on */
if (vreg->is_enabled && !vreg->is_always_on) {
ret = regulator_disable(vreg->reg);
if (ret) {
pr_err("%s: regulator_disable(%s) failed. ret=%d\n",
__func__, vreg->name, ret);
goto out;
}
vreg->is_enabled = false;
ret = sdhci_msm_vreg_set_optimum_mode(vreg, 0);
if (ret < 0)
goto out;
/* Set min. voltage level to 0 */
ret = sdhci_msm_vreg_set_voltage(vreg, 0, vreg->high_vol_level);
if (ret)
goto out;
} else if (vreg->is_enabled && vreg->is_always_on) {
if (vreg->lpm_sup) {
/* Put always_on regulator in LPM (low power mode) */
ret = sdhci_msm_vreg_set_optimum_mode(vreg,
vreg->lpm_uA);
if (ret < 0)
goto out;
}
}
out:
return ret;
}
static int sdhci_msm_setup_vreg(struct sdhci_msm_pltfm_data *pdata,
bool enable, bool is_init)
{
int ret = 0, i;
struct sdhci_msm_slot_reg_data *curr_slot;
struct sdhci_msm_reg_data *vreg_table[2];
curr_slot = pdata->vreg_data;
if (!curr_slot) {
pr_debug("%s: vreg info unavailable,assuming the slot is powered by always on domain\n",
__func__);
goto out;
}
vreg_table[0] = curr_slot->vdd_data;
vreg_table[1] = curr_slot->vdd_io_data;
for (i = 0; i < ARRAY_SIZE(vreg_table); i++) {
if (vreg_table[i]) {
if (enable)
ret = sdhci_msm_vreg_enable(vreg_table[i]);
else
ret = sdhci_msm_vreg_disable(vreg_table[i]);
if (ret)
goto out;
}
}
out:
return ret;
}
/*
* Reset vreg by ensuring it is off during probe. A call
* to enable vreg is needed to balance disable vreg
*/
static int sdhci_msm_vreg_reset(struct sdhci_msm_pltfm_data *pdata)
{
int ret;
ret = sdhci_msm_setup_vreg(pdata, 1, true);
if (ret)
return ret;
ret = sdhci_msm_setup_vreg(pdata, 0, true);
return ret;
}
/* This init function should be called only once for each SDHC slot */
static int sdhci_msm_vreg_init(struct device *dev,
struct sdhci_msm_pltfm_data *pdata,
bool is_init)
{
int ret = 0;
struct sdhci_msm_slot_reg_data *curr_slot;
struct sdhci_msm_reg_data *curr_vdd_reg, *curr_vdd_io_reg;
curr_slot = pdata->vreg_data;
if (!curr_slot)
goto out;
curr_vdd_reg = curr_slot->vdd_data;
curr_vdd_io_reg = curr_slot->vdd_io_data;
if (!is_init)
/* Deregister all regulators from regulator framework */
goto vdd_io_reg_deinit;
/*
* Get the regulator handle from voltage regulator framework
* and then try to set the voltage level for the regulator
*/
if (curr_vdd_reg) {
ret = sdhci_msm_vreg_init_reg(dev, curr_vdd_reg);
if (ret)
goto out;
}
if (curr_vdd_io_reg) {
ret = sdhci_msm_vreg_init_reg(dev, curr_vdd_io_reg);
if (ret)
goto vdd_reg_deinit;
}
ret = sdhci_msm_vreg_reset(pdata);
if (ret)
dev_err(dev, "vreg reset failed (%d)\n", ret);
goto out;
vdd_io_reg_deinit:
if (curr_vdd_io_reg)
sdhci_msm_vreg_deinit_reg(curr_vdd_io_reg);
vdd_reg_deinit:
if (curr_vdd_reg)
sdhci_msm_vreg_deinit_reg(curr_vdd_reg);
out:
return ret;
}
static int sdhci_msm_set_vdd_io_vol(struct sdhci_msm_pltfm_data *pdata,
enum vdd_io_level level,
unsigned int voltage_level)
{
int ret = 0;
int set_level;
struct sdhci_msm_reg_data *vdd_io_reg;
if (!pdata->vreg_data)
return ret;
vdd_io_reg = pdata->vreg_data->vdd_io_data;
if (vdd_io_reg && vdd_io_reg->is_enabled) {
switch (level) {
case VDD_IO_LOW:
set_level = vdd_io_reg->low_vol_level;
break;
case VDD_IO_HIGH:
set_level = vdd_io_reg->high_vol_level;
break;
case VDD_IO_SET_LEVEL:
set_level = voltage_level;
break;
default:
pr_err("%s: invalid argument level = %d",
__func__, level);
ret = -EINVAL;
return ret;
}
ret = sdhci_msm_vreg_set_voltage(vdd_io_reg, set_level,
set_level);
}
return ret;
}
static irqreturn_t sdhci_msm_pwr_irq(int irq, void *data)
{
struct sdhci_host *host = (struct sdhci_host *)data;
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct sdhci_msm_host *msm_host = pltfm_host->priv;
u8 irq_status = 0;
u8 irq_ack = 0;
int ret = 0;
int pwr_state = 0, io_level = 0;
unsigned long flags;
irq_status = readb_relaxed(msm_host->core_mem + CORE_PWRCTL_STATUS);
pr_debug("%s: Received IRQ(%d), status=0x%x\n",
mmc_hostname(msm_host->mmc), irq, irq_status);
/* Clear the interrupt */
writeb_relaxed(irq_status, (msm_host->core_mem + CORE_PWRCTL_CLEAR));
/*
* SDHC has core_mem and hc_mem device memory and these memory
* addresses do not fall within 1KB region. Hence, any update to
* core_mem address space would require an mb() to ensure this gets
* completed before its next update to registers within hc_mem.
*/
mb();
/* Handle BUS ON/OFF*/
if (irq_status & CORE_PWRCTL_BUS_ON) {
ret = sdhci_msm_setup_vreg(msm_host->pdata, true, false);
if (!ret) {
ret = sdhci_msm_setup_pins(msm_host->pdata, true);
ret |= sdhci_msm_set_vdd_io_vol(msm_host->pdata,
VDD_IO_HIGH, 0);
}
if (ret)
irq_ack |= CORE_PWRCTL_BUS_FAIL;
else
irq_ack |= CORE_PWRCTL_BUS_SUCCESS;
pwr_state = REQ_BUS_ON;
io_level = REQ_IO_HIGH;
}
if (irq_status & CORE_PWRCTL_BUS_OFF) {
ret = sdhci_msm_setup_vreg(msm_host->pdata, false, false);
if (!ret) {
ret = sdhci_msm_setup_pins(msm_host->pdata, false);
ret |= sdhci_msm_set_vdd_io_vol(msm_host->pdata,
VDD_IO_LOW, 0);
}
if (ret)
irq_ack |= CORE_PWRCTL_BUS_FAIL;
else
irq_ack |= CORE_PWRCTL_BUS_SUCCESS;
pwr_state = REQ_BUS_OFF;
io_level = REQ_IO_LOW;
}
/* Handle IO LOW/HIGH */
if (irq_status & CORE_PWRCTL_IO_LOW) {
/* Switch voltage Low */
ret = sdhci_msm_set_vdd_io_vol(msm_host->pdata, VDD_IO_LOW, 0);
if (ret)
irq_ack |= CORE_PWRCTL_IO_FAIL;
else
irq_ack |= CORE_PWRCTL_IO_SUCCESS;
io_level = REQ_IO_LOW;
}
if (irq_status & CORE_PWRCTL_IO_HIGH) {
/* Switch voltage High */
ret = sdhci_msm_set_vdd_io_vol(msm_host->pdata, VDD_IO_HIGH, 0);
if (ret)
irq_ack |= CORE_PWRCTL_IO_FAIL;
else
irq_ack |= CORE_PWRCTL_IO_SUCCESS;
io_level = REQ_IO_HIGH;
}
/* ACK status to the core */
writeb_relaxed(irq_ack, (msm_host->core_mem + CORE_PWRCTL_CTL));
/*
* SDHC has core_mem and hc_mem device memory and these memory
* addresses do not fall within 1KB region. Hence, any update to
* core_mem address space would require an mb() to ensure this gets
* completed before its next update to registers within hc_mem.
*/
mb();
if (io_level & REQ_IO_HIGH)
writel_relaxed((readl_relaxed(host->ioaddr + CORE_VENDOR_SPEC) &
~CORE_IO_PAD_PWR_SWITCH),
host->ioaddr + CORE_VENDOR_SPEC);
else if (io_level & REQ_IO_LOW)
writel_relaxed((readl_relaxed(host->ioaddr + CORE_VENDOR_SPEC) |
CORE_IO_PAD_PWR_SWITCH),
host->ioaddr + CORE_VENDOR_SPEC);
mb();
pr_debug("%s: Handled IRQ(%d), ret=%d, ack=0x%x\n",
mmc_hostname(msm_host->mmc), irq, ret, irq_ack);
spin_lock_irqsave(&host->lock, flags);
if (pwr_state)
msm_host->curr_pwr_state = pwr_state;
if (io_level)
msm_host->curr_io_level = io_level;
complete(&msm_host->pwr_irq_completion);
spin_unlock_irqrestore(&host->lock, flags);
return IRQ_HANDLED;
}
/* This function returns the max. current supported by VDD rail in mA */
static unsigned int sdhci_msm_get_vreg_vdd_max_current(struct sdhci_msm_host
*host)
{
struct sdhci_msm_slot_reg_data *curr_slot = host->pdata->vreg_data;
if (!curr_slot)
return 0;
if (curr_slot->vdd_data)
return curr_slot->vdd_data->hpm_uA / 1000;
else
return 0;
}
static ssize_t
show_sdhci_max_bus_bw(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct sdhci_host *host = dev_get_drvdata(dev);
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct sdhci_msm_host *msm_host = pltfm_host->priv;
return snprintf(buf, PAGE_SIZE, "%u\n",
msm_host->msm_bus_vote.is_max_bw_needed);
}
static ssize_t
store_sdhci_max_bus_bw(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct sdhci_host *host = dev_get_drvdata(dev);
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct sdhci_msm_host *msm_host = pltfm_host->priv;
uint32_t value;
unsigned long flags;
if (!kstrtou32(buf, 0, &value)) {
spin_lock_irqsave(&host->lock, flags);
msm_host->msm_bus_vote.is_max_bw_needed = !!value;
spin_unlock_irqrestore(&host->lock, flags);
}
return count;
}
static void sdhci_msm_check_power_status(struct sdhci_host *host, u32 req_type)
{
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct sdhci_msm_host *msm_host = pltfm_host->priv;
unsigned long flags;
bool done = false;
spin_lock_irqsave(&host->lock, flags);
pr_debug("%s: %s: request %d curr_pwr_state %x curr_io_level %x\n",
mmc_hostname(host->mmc), __func__, req_type,
msm_host->curr_pwr_state, msm_host->curr_io_level);
if ((req_type & msm_host->curr_pwr_state) ||
(req_type & msm_host->curr_io_level))
done = true;
spin_unlock_irqrestore(&host->lock, flags);
/*
* This is needed here to hanlde a case where IRQ gets
* triggered even before this function is called so that
* x->done counter of completion gets reset. Otherwise,
* next call to wait_for_completion returns immediately
* without actually waiting for the IRQ to be handled.
*/
if (done)
init_completion(&msm_host->pwr_irq_completion);
else
wait_for_completion(&msm_host->pwr_irq_completion);
pr_debug("%s: %s: request %d done\n", mmc_hostname(host->mmc),
__func__, req_type);
}
static void sdhci_msm_toggle_cdr(struct sdhci_host *host, bool enable)
{
if (enable)
writel_relaxed((readl_relaxed(host->ioaddr +
CORE_DLL_CONFIG) | CORE_CDR_EN),
host->ioaddr + CORE_DLL_CONFIG);
else
writel_relaxed((readl_relaxed(host->ioaddr +
CORE_DLL_CONFIG) & ~CORE_CDR_EN),
host->ioaddr + CORE_DLL_CONFIG);
}
static unsigned int sdhci_msm_max_segs(void)
{
return SDHCI_MSM_MAX_SEGMENTS;
}
static unsigned int sdhci_msm_get_min_clock(struct sdhci_host *host)
{
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct sdhci_msm_host *msm_host = pltfm_host->priv;
return msm_host->pdata->sup_clk_table[0];
}
static unsigned int sdhci_msm_get_max_clock(struct sdhci_host *host)
{
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct sdhci_msm_host *msm_host = pltfm_host->priv;
int max_clk_index = msm_host->pdata->sup_clk_cnt;
return msm_host->pdata->sup_clk_table[max_clk_index - 1];
}
static unsigned int sdhci_msm_get_sup_clk_rate(struct sdhci_host *host,
u32 req_clk)
{
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct sdhci_msm_host *msm_host = pltfm_host->priv;
unsigned int sel_clk = -1;
unsigned char cnt;
if (req_clk < sdhci_msm_get_min_clock(host)) {
sel_clk = sdhci_msm_get_min_clock(host);
return sel_clk;
}
for (cnt = 0; cnt < msm_host->pdata->sup_clk_cnt; cnt++) {
if (msm_host->pdata->sup_clk_table[cnt] > req_clk) {
break;
} else if (msm_host->pdata->sup_clk_table[cnt] == req_clk) {
sel_clk = msm_host->pdata->sup_clk_table[cnt];
break;
} else {
sel_clk = msm_host->pdata->sup_clk_table[cnt];
}
}
return sel_clk;
}
static int sdhci_msm_prepare_clocks(struct sdhci_host *host, bool enable)
{
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct sdhci_msm_host *msm_host = pltfm_host->priv;
int rc = 0;
if (enable && !atomic_read(&msm_host->clks_on)) {
pr_debug("%s: request to enable clocks\n",
mmc_hostname(host->mmc));
sdhci_msm_bus_voting(host, 1);
if (!IS_ERR_OR_NULL(msm_host->bus_clk)) {
rc = clk_prepare_enable(msm_host->bus_clk);
if (rc) {
pr_err("%s: %s: failed to enable the bus-clock with error %d\n",
mmc_hostname(host->mmc), __func__, rc);
goto remove_vote;
}
}
if (!IS_ERR(msm_host->pclk)) {
rc = clk_prepare_enable(msm_host->pclk);
if (rc) {
pr_err("%s: %s: failed to enable the pclk with error %d\n",
mmc_hostname(host->mmc), __func__, rc);
goto disable_bus_clk;
}
}
rc = clk_prepare_enable(msm_host->clk);
if (rc) {
pr_err("%s: %s: failed to enable the host-clk with error %d\n",
mmc_hostname(host->mmc), __func__, rc);
goto disable_pclk;
}
mb();
} else if (!enable && atomic_read(&msm_host->clks_on)) {
pr_debug("%s: request to disable clocks\n",
mmc_hostname(host->mmc));
sdhci_writew(host, 0, SDHCI_CLOCK_CONTROL);
mb();
clk_disable_unprepare(msm_host->clk);
if (!IS_ERR(msm_host->pclk))
clk_disable_unprepare(msm_host->pclk);
if (!IS_ERR_OR_NULL(msm_host->bus_clk))
clk_disable_unprepare(msm_host->bus_clk);
sdhci_msm_bus_voting(host, 0);
}
atomic_set(&msm_host->clks_on, enable);
goto out;
disable_pclk:
if (!IS_ERR_OR_NULL(msm_host->pclk))
clk_disable_unprepare(msm_host->pclk);
disable_bus_clk:
if (!IS_ERR_OR_NULL(msm_host->bus_clk))
clk_disable_unprepare(msm_host->bus_clk);
remove_vote:
if (msm_host->msm_bus_vote.client_handle)
sdhci_msm_bus_cancel_work_and_set_vote(host, 0);
out:
return rc;
}
static void sdhci_msm_set_clock(struct sdhci_host *host, unsigned int clock)
{
int rc;
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct sdhci_msm_host *msm_host = pltfm_host->priv;
struct mmc_ios curr_ios = host->mmc->ios;
u32 sup_clock, ddr_clock;
if (!clock) {
sdhci_msm_prepare_clocks(host, false);
host->clock = clock;
return;
}
rc = sdhci_msm_prepare_clocks(host, true);
if (rc)
return;
sup_clock = sdhci_msm_get_sup_clk_rate(host, clock);
if (curr_ios.timing == MMC_TIMING_UHS_DDR50) {
/*
* The SDHC requires internal clock frequency to be double the
* actual clock that will be set for DDR mode. The controller
* uses the faster clock(100MHz) for some of its parts and send
* the actual required clock (50MHz) to the card.
*/
ddr_clock = clock * 2;
sup_clock = sdhci_msm_get_sup_clk_rate(host,
ddr_clock);
}
if (sup_clock != msm_host->clk_rate) {
pr_debug("%s: %s: setting clk rate to %u\n",
mmc_hostname(host->mmc), __func__, sup_clock);
rc = clk_set_rate(msm_host->clk, sup_clock);
if (rc) {
pr_err("%s: %s: Failed to set rate %u for host-clk : %d\n",
mmc_hostname(host->mmc), __func__,
sup_clock, rc);
return;
}
msm_host->clk_rate = sup_clock;
host->clock = clock;
/*
* Update the bus vote in case of frequency change due to
* clock scaling.
*/
sdhci_msm_bus_voting(host, 1);
}
}
static int sdhci_msm_set_uhs_signaling(struct sdhci_host *host,
unsigned int uhs)
{
u16 ctrl_2;
ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
/* Select Bus Speed Mode for host */
ctrl_2 &= ~SDHCI_CTRL_UHS_MASK;
if (uhs == MMC_TIMING_MMC_HS200)
ctrl_2 |= SDHCI_CTRL_UHS_SDR104;
else if (uhs == MMC_TIMING_UHS_SDR12)
ctrl_2 |= SDHCI_CTRL_UHS_SDR12;
else if (uhs == MMC_TIMING_UHS_SDR25)
ctrl_2 |= SDHCI_CTRL_UHS_SDR25;
else if (uhs == MMC_TIMING_UHS_SDR50)
ctrl_2 |= SDHCI_CTRL_UHS_SDR50;
else if (uhs == MMC_TIMING_UHS_SDR104)
ctrl_2 |= SDHCI_CTRL_UHS_SDR104;
else if (uhs == MMC_TIMING_UHS_DDR50)
ctrl_2 |= SDHCI_CTRL_UHS_DDR50;
/*
* When clock frquency is less than 100MHz, the feedback clock must be
* provided and DLL must not be used so that tuning can be skipped. To
* provide feedback clock, the mode selection can be any value less
* than 3'b011 in bits [2:0] of HOST CONTROL2 register.
*/
if (host->clock <= (100 * 1000 * 1000) &&
(uhs == MMC_TIMING_MMC_HS200 ||
uhs == MMC_TIMING_UHS_SDR104))
ctrl_2 &= ~SDHCI_CTRL_UHS_MASK;
sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2);
return 0;
}
/*
* sdhci_msm_disable_data_xfer - disable undergoing AHB bus data transfer
*
* Write 0 to bit 0 in MCI_DATA_CTL (offset 0x2C) - clearing TxActive bit by
* access to legacy registers. It will stop current burst and prevent start of
* the next on.
*
* Polling CORE_AHB_DATA_DELAY_US timeout, by reading bit 13:12 until they are 0
* in CORE_SDCC_DEBUG_REG (offset 0x124) will validate that AHB burst was
* completed and a new one didn't start.
*
* Waiting for 4us while AHB finishes descriptors fetch.
*/
static void sdhci_msm_disable_data_xfer(struct sdhci_host *host)
{
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct sdhci_msm_host *msm_host = pltfm_host->priv;
u32 value;
int ret;
value = readl_relaxed(msm_host->core_mem + CORE_MCI_DATA_CTRL);
value &= ~(u32)CORE_MCI_DPSM_ENABLE;
writel_relaxed(value, msm_host->core_mem + CORE_MCI_DATA_CTRL);
/* Enable the test bus for device slot */
writel_relaxed(CORE_TESTBUS_ENA | CORE_TESTBUS_SEL2,
msm_host->core_mem + CORE_TESTBUS_CONFIG);
ret = readl_poll_timeout_noirq(msm_host->core_mem
+ CORE_SDCC_DEBUG_REG, value,
!(value & CORE_DEBUG_REG_AHB_HTRANS),
CORE_AHB_DATA_DELAY_US, 1);
if (ret) {
pr_err("%s: %s: can't stop ongoing AHB bus access by ADMA\n",
mmc_hostname(host->mmc), __func__);
BUG();
}
/* Disable the test bus for device slot */
value = readl_relaxed(msm_host->core_mem + CORE_TESTBUS_CONFIG);
value &= ~CORE_TESTBUS_ENA;
writel_relaxed(value, msm_host->core_mem + CORE_TESTBUS_CONFIG);
udelay(CORE_AHB_DESC_DELAY_US);
}
static struct sdhci_ops sdhci_msm_ops = {
.set_uhs_signaling = sdhci_msm_set_uhs_signaling,
.check_power_status = sdhci_msm_check_power_status,
.execute_tuning = sdhci_msm_execute_tuning,
.toggle_cdr = sdhci_msm_toggle_cdr,
.get_max_segments = sdhci_msm_max_segs,
.set_clock = sdhci_msm_set_clock,
.get_min_clock = sdhci_msm_get_min_clock,
.get_max_clock = sdhci_msm_get_max_clock,
.disable_data_xfer = sdhci_msm_disable_data_xfer,
};
static int __devinit sdhci_msm_probe(struct platform_device *pdev)
{
struct sdhci_host *host;
struct sdhci_pltfm_host *pltfm_host;
struct sdhci_msm_host *msm_host;
struct resource *core_memres = NULL;
int ret = 0, dead = 0;
u32 vdd_max_current;
u16 host_version;
u32 pwr, irq_status, irq_ctl;
pr_debug("%s: Enter %s\n", dev_name(&pdev->dev), __func__);
msm_host = devm_kzalloc(&pdev->dev, sizeof(struct sdhci_msm_host),
GFP_KERNEL);
if (!msm_host) {
ret = -ENOMEM;
goto out;
}
msm_host->sdhci_msm_pdata.ops = &sdhci_msm_ops;
host = sdhci_pltfm_init(pdev, &msm_host->sdhci_msm_pdata);
if (IS_ERR(host)) {
ret = PTR_ERR(host);
goto out;
}
pltfm_host = sdhci_priv(host);
pltfm_host->priv = msm_host;
msm_host->mmc = host->mmc;
msm_host->pdev = pdev;
/* Extract platform data */
if (pdev->dev.of_node) {
ret = of_alias_get_id(pdev->dev.of_node, "sdhc");
if (ret < 0) {
dev_err(&pdev->dev, "Failed to get slot index %d\n",
ret);
goto pltfm_free;
}
if (disable_slots & (1 << (ret - 1))) {
dev_info(&pdev->dev, "%s: Slot %d disabled\n", __func__,
ret);
ret = -ENODEV;
goto pltfm_free;
}
msm_host->pdata = sdhci_msm_populate_pdata(&pdev->dev);
if (!msm_host->pdata) {
dev_err(&pdev->dev, "DT parsing error\n");
goto pltfm_free;
}
} else {
dev_err(&pdev->dev, "No device tree node\n");
goto pltfm_free;
}
/* Setup Clocks */
/* Setup SDCC bus voter clock. */
msm_host->bus_clk = devm_clk_get(&pdev->dev, "bus_clk");
if (!IS_ERR_OR_NULL(msm_host->bus_clk)) {
/* Vote for max. clk rate for max. performance */
ret = clk_set_rate(msm_host->bus_clk, INT_MAX);
if (ret)
goto pltfm_free;
ret = clk_prepare_enable(msm_host->bus_clk);
if (ret)
goto pltfm_free;
}
/* Setup main peripheral bus clock */
msm_host->pclk = devm_clk_get(&pdev->dev, "iface_clk");
if (!IS_ERR(msm_host->pclk)) {
ret = clk_prepare_enable(msm_host->pclk);
if (ret)
goto bus_clk_disable;
}
/* Setup SDC MMC clock */
msm_host->clk = devm_clk_get(&pdev->dev, "core_clk");
if (IS_ERR(msm_host->clk)) {
ret = PTR_ERR(msm_host->clk);
goto pclk_disable;
}
/* Set to the minimum supported clock frequency */
ret = clk_set_rate(msm_host->clk, sdhci_msm_get_min_clock(host));
if (ret) {
dev_err(&pdev->dev, "MClk rate set failed (%d)\n", ret);
goto pclk_disable;
}
ret = clk_prepare_enable(msm_host->clk);
if (ret)
goto pclk_disable;
msm_host->clk_rate = sdhci_msm_get_min_clock(host);
atomic_set(&msm_host->clks_on, 1);
ret = sdhci_msm_bus_register(msm_host, pdev);
if (ret)
goto clk_disable;
if (msm_host->msm_bus_vote.client_handle)
INIT_DELAYED_WORK(&msm_host->msm_bus_vote.vote_work,
sdhci_msm_bus_work);
sdhci_msm_bus_voting(host, 1);
/* Setup regulators */
ret = sdhci_msm_vreg_init(&pdev->dev, msm_host->pdata, true);
if (ret) {
dev_err(&pdev->dev, "Regulator setup failed (%d)\n", ret);
goto bus_unregister;
}
/* Reset the core and Enable SDHC mode */
core_memres = platform_get_resource_byname(pdev,
IORESOURCE_MEM, "core_mem");
msm_host->core_mem = devm_ioremap(&pdev->dev, core_memres->start,
resource_size(core_memres));
if (!msm_host->core_mem) {
dev_err(&pdev->dev, "Failed to remap registers\n");
ret = -ENOMEM;
goto vreg_deinit;
}
/* Set SW_RST bit in POWER register (Offset 0x0) */
writel_relaxed(readl_relaxed(msm_host->core_mem + CORE_POWER) |
CORE_SW_RST, msm_host->core_mem + CORE_POWER);
/*
* SW reset can take upto 10HCLK + 15MCLK cycles.
* Calculating based on min clk rates (hclk = 27MHz,
* mclk = 400KHz) it comes to ~40us. Let's poll for
* max. 1ms for reset completion.
*/
ret = readl_poll_timeout(msm_host->core_mem + CORE_POWER,
pwr, !(pwr & CORE_SW_RST), 100, 10);
if (ret) {
dev_err(&pdev->dev, "reset failed (%d)\n", ret);
goto vreg_deinit;
}
/* Set HC_MODE_EN bit in HC_MODE register */
writel_relaxed(HC_MODE_EN, (msm_host->core_mem + CORE_HC_MODE));
/*
* CORE_SW_RST above may trigger power irq if previous status of PWRCTL
* was either BUS_ON or IO_HIGH_V. So before we enable the power irq
* interrupt in GIC (by registering the interrupt handler), we need to
* ensure that any pending power irq interrupt status is acknowledged
* otherwise power irq interrupt handler would be fired prematurely.
*/
irq_status = readl_relaxed(msm_host->core_mem + CORE_PWRCTL_STATUS);
writel_relaxed(irq_status, (msm_host->core_mem + CORE_PWRCTL_CLEAR));
irq_ctl = readl_relaxed(msm_host->core_mem + CORE_PWRCTL_CTL);
if (irq_status & (CORE_PWRCTL_BUS_ON | CORE_PWRCTL_BUS_OFF))
irq_ctl |= CORE_PWRCTL_BUS_SUCCESS;
if (irq_status & (CORE_PWRCTL_IO_HIGH | CORE_PWRCTL_IO_LOW))
irq_ctl |= CORE_PWRCTL_IO_SUCCESS;
writel_relaxed(irq_ctl, (msm_host->core_mem + CORE_PWRCTL_CTL));
/*
* Ensure that above writes are propogated before interrupt enablement
* in GIC.
*/
mb();
/*
* Following are the deviations from SDHC spec v3.0 -
* 1. Card detection is handled using separate GPIO.
* 2. Bus power control is handled by interacting with PMIC.
*/
host->quirks |= SDHCI_QUIRK_BROKEN_CARD_DETECTION;
host->quirks |= SDHCI_QUIRK_SINGLE_POWER_WRITE;
host->quirks |= SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN;
host->quirks2 |= SDHCI_QUIRK2_ALWAYS_USE_BASE_CLOCK;
host->quirks2 |= SDHCI_QUIRK2_IGNORE_CMDCRC_FOR_TUNING;
host->quirks2 |= SDHCI_QUIRK2_USE_MAX_DISCARD_SIZE;
host->quirks2 |= SDHCI_QUIRK2_IGNORE_DATATOUT_FOR_R1BCMD;
host->quirks2 |= SDHCI_QUIRK2_BROKEN_PRESET_VALUE;
host->quirks2 |= SDHCI_QUIRK2_USE_RESERVED_MAX_TIMEOUT;
host_version = readw_relaxed((host->ioaddr + SDHCI_HOST_VERSION));
dev_dbg(&pdev->dev, "Host Version: 0x%x Vendor Version 0x%x\n",
host_version, ((host_version & SDHCI_VENDOR_VER_MASK) >>
SDHCI_VENDOR_VER_SHIFT));
if (((host_version & SDHCI_VENDOR_VER_MASK) >>
SDHCI_VENDOR_VER_SHIFT) == SDHCI_VER_100) {
/*
* Add 40us delay in interrupt handler when
* operating at initialization frequency(400KHz).
*/
host->quirks2 |= SDHCI_QUIRK2_SLOW_INT_CLR;
/*
* Set Software Reset for DAT line in Software
* Reset Register (Bit 2).
*/
host->quirks2 |= SDHCI_QUIRK2_RDWR_TX_ACTIVE_EOT;
}
/* Setup PWRCTL irq */
msm_host->pwr_irq = platform_get_irq_byname(pdev, "pwr_irq");
if (msm_host->pwr_irq < 0) {
dev_err(&pdev->dev, "Failed to get pwr_irq by name (%d)\n",
msm_host->pwr_irq);
goto vreg_deinit;
}
ret = devm_request_threaded_irq(&pdev->dev, msm_host->pwr_irq, NULL,
sdhci_msm_pwr_irq, IRQF_ONESHOT,
dev_name(&pdev->dev), host);
if (ret) {
dev_err(&pdev->dev, "Request threaded irq(%d) failed (%d)\n",
msm_host->pwr_irq, ret);
goto vreg_deinit;
}
/* Enable pwr irq interrupts */
writel_relaxed(INT_MASK, (msm_host->core_mem + CORE_PWRCTL_MASK));
/* Set clock gating delay to be used when CONFIG_MMC_CLKGATE is set */
msm_host->mmc->clkgate_delay = SDHCI_MSM_MMC_CLK_GATE_DELAY;
/* Set host capabilities */
msm_host->mmc->caps |= msm_host->pdata->mmc_bus_width;
msm_host->mmc->caps |= msm_host->pdata->caps;
vdd_max_current = sdhci_msm_get_vreg_vdd_max_current(msm_host);
if (vdd_max_current >= 800)
msm_host->mmc->caps |= MMC_CAP_MAX_CURRENT_800;
else if (vdd_max_current >= 600)
msm_host->mmc->caps |= MMC_CAP_MAX_CURRENT_600;
else if (vdd_max_current >= 400)
msm_host->mmc->caps |= MMC_CAP_MAX_CURRENT_400;
else
msm_host->mmc->caps |= MMC_CAP_MAX_CURRENT_200;
if (vdd_max_current > 150)
msm_host->mmc->caps |= MMC_CAP_SET_XPC_180 |
MMC_CAP_SET_XPC_300|
MMC_CAP_SET_XPC_330;
msm_host->mmc->caps |= MMC_CAP_HW_RESET;
msm_host->mmc->caps2 |= msm_host->pdata->caps2;
msm_host->mmc->caps2 |= MMC_CAP2_CORE_RUNTIME_PM;
msm_host->mmc->caps2 |= MMC_CAP2_PACKED_WR;
msm_host->mmc->caps2 |= MMC_CAP2_PACKED_WR_CONTROL;
msm_host->mmc->caps2 |= (MMC_CAP2_BOOTPART_NOACC |
MMC_CAP2_DETECT_ON_ERR);
msm_host->mmc->caps2 |= MMC_CAP2_SANITIZE;
msm_host->mmc->caps2 |= MMC_CAP2_CACHE_CTRL;
msm_host->mmc->caps2 |= MMC_CAP2_POWEROFF_NOTIFY;
msm_host->mmc->caps2 |= MMC_CAP2_CLK_SCALE;
msm_host->mmc->caps2 |= MMC_CAP2_STOP_REQUEST;
if (msm_host->pdata->nonremovable)
msm_host->mmc->caps |= MMC_CAP_NONREMOVABLE;
host->cpu_dma_latency_us = msm_host->pdata->cpu_dma_latency_us;
init_completion(&msm_host->pwr_irq_completion);
if (gpio_is_valid(msm_host->pdata->status_gpio)) {
ret = mmc_cd_gpio_request(msm_host->mmc,
msm_host->pdata->status_gpio);
if (ret) {
dev_err(&pdev->dev, "%s: Failed to request card detection IRQ %d\n",
__func__, ret);
goto vreg_deinit;
}
}
if (dma_supported(mmc_dev(host->mmc), DMA_BIT_MASK(32))) {
host->dma_mask = DMA_BIT_MASK(32);
mmc_dev(host->mmc)->dma_mask = &host->dma_mask;
} else {
dev_err(&pdev->dev, "%s: Failed to set dma mask\n", __func__);
}
ret = sdhci_add_host(host);
if (ret) {
dev_err(&pdev->dev, "Add host failed (%d)\n", ret);
goto free_cd_gpio;
}
msm_host->msm_bus_vote.max_bus_bw.show = show_sdhci_max_bus_bw;
msm_host->msm_bus_vote.max_bus_bw.store = store_sdhci_max_bus_bw;
sysfs_attr_init(&msm_host->msm_bus_vote.max_bus_bw.attr);
msm_host->msm_bus_vote.max_bus_bw.attr.name = "max_bus_bw";
msm_host->msm_bus_vote.max_bus_bw.attr.mode = S_IRUGO | S_IWUSR;
ret = device_create_file(&pdev->dev,
&msm_host->msm_bus_vote.max_bus_bw);
if (ret)
goto remove_host;
ret = pm_runtime_set_active(&pdev->dev);
if (ret)
pr_err("%s: %s: pm_runtime_set_active failed: err: %d\n",
mmc_hostname(host->mmc), __func__, ret);
else
pm_runtime_enable(&pdev->dev);
/* Successful initialization */
goto out;
remove_host:
dead = (readl_relaxed(host->ioaddr + SDHCI_INT_STATUS) == 0xffffffff);
sdhci_remove_host(host, dead);
free_cd_gpio:
if (gpio_is_valid(msm_host->pdata->status_gpio))
mmc_cd_gpio_free(msm_host->mmc);
vreg_deinit:
sdhci_msm_vreg_init(&pdev->dev, msm_host->pdata, false);
bus_unregister:
if (msm_host->msm_bus_vote.client_handle)
sdhci_msm_bus_cancel_work_and_set_vote(host, 0);
sdhci_msm_bus_unregister(msm_host);
clk_disable:
if (!IS_ERR(msm_host->clk))
clk_disable_unprepare(msm_host->clk);
pclk_disable:
if (!IS_ERR(msm_host->pclk))
clk_disable_unprepare(msm_host->pclk);
bus_clk_disable:
if (!IS_ERR_OR_NULL(msm_host->bus_clk))
clk_disable_unprepare(msm_host->bus_clk);
pltfm_free:
sdhci_pltfm_free(pdev);
out:
pr_debug("%s: Exit %s\n", dev_name(&pdev->dev), __func__);
return ret;
}
static int __devexit sdhci_msm_remove(struct platform_device *pdev)
{
struct sdhci_host *host = platform_get_drvdata(pdev);
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct sdhci_msm_host *msm_host = pltfm_host->priv;
struct sdhci_msm_pltfm_data *pdata = msm_host->pdata;
int dead = (readl_relaxed(host->ioaddr + SDHCI_INT_STATUS) ==
0xffffffff);
pr_debug("%s: %s\n", dev_name(&pdev->dev), __func__);
device_remove_file(&pdev->dev, &msm_host->msm_bus_vote.max_bus_bw);
sdhci_remove_host(host, dead);
pm_runtime_disable(&pdev->dev);
sdhci_pltfm_free(pdev);
if (gpio_is_valid(msm_host->pdata->status_gpio))
mmc_cd_gpio_free(msm_host->mmc);
sdhci_msm_vreg_init(&pdev->dev, msm_host->pdata, false);
if (pdata->pin_data)
sdhci_msm_setup_pins(pdata, false);
if (msm_host->msm_bus_vote.client_handle) {
sdhci_msm_bus_cancel_work_and_set_vote(host, 0);
sdhci_msm_bus_unregister(msm_host);
}
return 0;
}
static int sdhci_msm_runtime_suspend(struct device *dev)
{
struct sdhci_host *host = dev_get_drvdata(dev);
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct sdhci_msm_host *msm_host = pltfm_host->priv;
disable_irq(host->irq);
disable_irq(msm_host->pwr_irq);
/*
* Remove the vote immediately only if clocks are off in which
* case we might have queued work to remove vote but it may not
* be completed before runtime suspend or system suspend.
*/
if (!atomic_read(&msm_host->clks_on)) {
if (msm_host->msm_bus_vote.client_handle)
sdhci_msm_bus_cancel_work_and_set_vote(host, 0);
}
return 0;
}
static int sdhci_msm_runtime_resume(struct device *dev)
{
struct sdhci_host *host = dev_get_drvdata(dev);
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct sdhci_msm_host *msm_host = pltfm_host->priv;
enable_irq(msm_host->pwr_irq);
enable_irq(host->irq);
return 0;
}
#ifdef CONFIG_PM_SLEEP
static int sdhci_msm_suspend(struct device *dev)
{
struct sdhci_host *host = dev_get_drvdata(dev);
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct sdhci_msm_host *msm_host = pltfm_host->priv;
int ret = 0;
if (gpio_is_valid(msm_host->pdata->status_gpio))
mmc_cd_gpio_free(msm_host->mmc);
if (pm_runtime_suspended(dev)) {
pr_debug("%s: %s: already runtime suspended\n",
mmc_hostname(host->mmc), __func__);
goto out;
}
return sdhci_msm_runtime_suspend(dev);
out:
return ret;
}
static int sdhci_msm_resume(struct device *dev)
{
struct sdhci_host *host = dev_get_drvdata(dev);
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct sdhci_msm_host *msm_host = pltfm_host->priv;
int ret = 0;
if (gpio_is_valid(msm_host->pdata->status_gpio)) {
ret = mmc_cd_gpio_request(msm_host->mmc,
msm_host->pdata->status_gpio);
if (ret)
pr_err("%s: %s: Failed to request card detection IRQ %d\n",
mmc_hostname(host->mmc), __func__, ret);
}
if (pm_runtime_suspended(dev)) {
pr_debug("%s: %s: runtime suspended, defer system resume\n",
mmc_hostname(host->mmc), __func__);
goto out;
}
return sdhci_msm_runtime_resume(dev);
out:
return ret;
}
#endif
#ifdef CONFIG_PM
static const struct dev_pm_ops sdhci_msm_pmops = {
SET_SYSTEM_SLEEP_PM_OPS(sdhci_msm_suspend, sdhci_msm_resume)
SET_RUNTIME_PM_OPS(sdhci_msm_runtime_suspend, sdhci_msm_runtime_resume,
NULL)
};
#define SDHCI_MSM_PMOPS (&sdhci_msm_pmops)
#else
#define SDHCI_PM_OPS NULL
#endif
static const struct of_device_id sdhci_msm_dt_match[] = {
{.compatible = "qcom,sdhci-msm"},
};
MODULE_DEVICE_TABLE(of, sdhci_msm_dt_match);
static struct platform_driver sdhci_msm_driver = {
.probe = sdhci_msm_probe,
.remove = __devexit_p(sdhci_msm_remove),
.driver = {
.name = "sdhci_msm",
.owner = THIS_MODULE,
.of_match_table = sdhci_msm_dt_match,
.pm = SDHCI_MSM_PMOPS,
},
};
module_platform_driver(sdhci_msm_driver);
MODULE_DESCRIPTION("Qualcomm Secure Digital Host Controller Interface driver");
MODULE_LICENSE("GPL v2");
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