mmc: sdhci-msm: Add platform_execute_tuning implementation

This patch adds implementation for platform specific tuning in order
to support HS200 bus speed mode on Qualcomm SDHCI controller.

Signed-off-by: Asutosh Das <asutoshd@codeaurora.org>
Signed-off-by: Venkat Gopalakrishnan <venkatg@codeaurora.org>
Signed-off-by: Georgi Djakov <gdjakov@mm-sol.com>
Acked-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Chris Ball <chris@printf.net>
This commit is contained in:
Georgi Djakov 2014-03-10 17:37:13 +02:00 committed by Chris Ball
parent 0eb0d9f4de
commit 415b5a75da

View File

@ -18,6 +18,8 @@
#include <linux/of_device.h>
#include <linux/regulator/consumer.h>
#include <linux/delay.h>
#include <linux/mmc/mmc.h>
#include <linux/slab.h>
#include "sdhci-pltfm.h"
@ -26,6 +28,42 @@
#define CORE_POWER 0x0
#define CORE_SW_RST BIT(7)
#define MAX_PHASES 16
#define CORE_DLL_LOCK BIT(7)
#define CORE_DLL_EN BIT(16)
#define CORE_CDR_EN BIT(17)
#define CORE_CK_OUT_EN BIT(18)
#define CORE_CDR_EXT_EN BIT(19)
#define CORE_DLL_PDN BIT(29)
#define CORE_DLL_RST BIT(30)
#define CORE_DLL_CONFIG 0x100
#define CORE_DLL_STATUS 0x108
#define CORE_VENDOR_SPEC 0x10c
#define CORE_CLK_PWRSAVE BIT(1)
#define CDR_SELEXT_SHIFT 20
#define CDR_SELEXT_MASK (0xf << CDR_SELEXT_SHIFT)
#define CMUX_SHIFT_PHASE_SHIFT 24
#define CMUX_SHIFT_PHASE_MASK (7 << CMUX_SHIFT_PHASE_SHIFT)
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
};
struct sdhci_msm_host {
struct platform_device *pdev;
@ -38,15 +76,387 @@ struct sdhci_msm_host {
};
/* Platform specific tuning */
static inline int msm_dll_poll_ck_out_en(struct sdhci_host *host, u8 poll)
{
u32 wait_cnt = 50;
u8 ck_out_en;
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) {
dev_err(mmc_dev(mmc), "%s: CK_OUT_EN bit is not %d\n",
mmc_hostname(mmc), poll);
return -ETIMEDOUT;
}
udelay(1);
ck_out_en = !!(readl_relaxed(host->ioaddr + CORE_DLL_CONFIG) &
CORE_CK_OUT_EN);
}
return 0;
}
static int msm_config_cm_dll_phase(struct sdhci_host *host, u8 phase)
{
int rc;
static const 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;
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.
*/
config = readl_relaxed(host->ioaddr + CORE_DLL_CONFIG);
config &= ~CDR_SELEXT_MASK;
config |= grey_coded_phase_table[phase] << CDR_SELEXT_SHIFT;
writel_relaxed(config, 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:
dev_err(mmc_dev(mmc), "%s: Failed to set DLL phase: %d\n",
mmc_hostname(mmc), phase);
out:
spin_unlock_irqrestore(&host->lock, flags);
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;
if (!total_phases || (total_phases > MAX_PHASES)) {
dev_err(mmc_dev(mmc), "%s: Invalid argument: total_phases=%d\n",
mmc_hostname(mmc), 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 = ranges[selected_row_index][i];
if (ret >= MAX_PHASES) {
ret = -EINVAL;
dev_err(mmc_dev(mmc), "%s: Invalid phase selected=%d\n",
mmc_hostname(mmc), ret);
}
return ret;
}
static inline void msm_cm_dll_set_freq(struct sdhci_host *host)
{
u32 mclk_freq = 0, config;
/* 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;
config = readl_relaxed(host->ioaddr + CORE_DLL_CONFIG);
config &= ~CMUX_SHIFT_PHASE_MASK;
config |= mclk_freq << CMUX_SHIFT_PHASE_SHIFT;
writel_relaxed(config, 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 wait_cnt = 50;
unsigned long flags;
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.
*/
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 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) {
dev_err(mmc_dev(mmc), "%s: DLL failed to LOCK\n",
mmc_hostname(mmc));
spin_unlock_irqrestore(&host->lock, flags);
return -ETIMEDOUT;
}
udelay(1);
}
spin_unlock_irqrestore(&host->lock, flags);
return 0;
}
static int sdhci_msm_execute_tuning(struct sdhci_host *host, u32 opcode)
{
int tuning_seq_cnt = 3;
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); /* Pattern size in bytes */
int rc;
struct mmc_host *mmc = host->mmc;
struct mmc_ios ios = host->mmc->ios;
/*
* Tuning is required for SDR104, HS200 and HS400 cards and if the clock
* frequency greater than 100MHz in those modes. The standard tuning
* procedure should not be executed, but a custom implementation will be
* added here instead.
* Tuning is required for SDR104, HS200 and HS400 cards and
* if clock frequency is greater than 100MHz in these modes.
*/
return 0;
if (host->clock <= 100 * 1000 * 1000 ||
!((ios.timing == MMC_TIMING_MMC_HS200) ||
(ios.timing == MMC_TIMING_UHS_SDR104)))
return 0;
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);
}
data_buf = kmalloc(size, GFP_KERNEL);
if (!data_buf)
return -ENOMEM;
retry:
/* First of all reset the tuning block */
rc = msm_init_cm_dll(host);
if (rc)
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 out;
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 = NSEC_PER_SEC; /* 1 second */
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;
dev_dbg(mmc_dev(mmc), "%s: Found good phase = %d\n",
mmc_hostname(mmc), phase);
}
} while (++phase < ARRAY_SIZE(tuned_phases));
if (tuned_phase_cnt) {
rc = msm_find_most_appropriate_phase(host, tuned_phases,
tuned_phase_cnt);
if (rc < 0)
goto out;
else
phase = rc;
/*
* Finally set the selected phase in delay
* line hw block.
*/
rc = msm_config_cm_dll_phase(host, phase);
if (rc)
goto out;
dev_dbg(mmc_dev(mmc), "%s: Setting the tuning phase to %d\n",
mmc_hostname(mmc), phase);
} else {
if (--tuning_seq_cnt)
goto retry;
/* Tuning failed */
dev_dbg(mmc_dev(mmc), "%s: No tuning point found\n",
mmc_hostname(mmc));
rc = -EIO;
}
out:
kfree(data_buf);
return rc;
}
static const struct of_device_id sdhci_msm_dt_match[] = {