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Diffstat (limited to 'target/linux/ipq806x/patches/0048-mmc-sdhci-msm-Add-platform_execute_tuning-implementa.patch')
-rw-r--r--target/linux/ipq806x/patches/0048-mmc-sdhci-msm-Add-platform_execute_tuning-implementa.patch472
1 files changed, 472 insertions, 0 deletions
diff --git a/target/linux/ipq806x/patches/0048-mmc-sdhci-msm-Add-platform_execute_tuning-implementa.patch b/target/linux/ipq806x/patches/0048-mmc-sdhci-msm-Add-platform_execute_tuning-implementa.patch
new file mode 100644
index 0000000..07e122f
--- /dev/null
+++ b/target/linux/ipq806x/patches/0048-mmc-sdhci-msm-Add-platform_execute_tuning-implementa.patch
@@ -0,0 +1,472 @@
+From c2a237b3e467c8bb349c4624b71ec400abaf8ad1 Mon Sep 17 00:00:00 2001
+From: Georgi Djakov <gdjakov@mm-sol.com>
+Date: Mon, 10 Mar 2014 17:37:13 +0200
+Subject: [PATCH 048/182] 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>
+---
+ drivers/mmc/host/sdhci-msm.c | 420 +++++++++++++++++++++++++++++++++++++++++-
+ 1 file changed, 415 insertions(+), 5 deletions(-)
+
+diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c
+index 3b0606f..acb0e9e 100644
+--- a/drivers/mmc/host/sdhci-msm.c
++++ b/drivers/mmc/host/sdhci-msm.c
+@@ -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;
+@@ -38,17 +76,389 @@ struct sdhci_msm_host {
+ };
+
+ /* Platform specific tuning */
+-static int sdhci_msm_execute_tuning(struct sdhci_host *host, u32 opcode)
++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);
++
+ /*
+- * 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.
++ * 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 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;
++
++ 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[] = {
+ { .compatible = "qcom,sdhci-msm-v4" },
+ {},
+--
+1.7.10.4
+
generated by cgit v1.1 at 2025-04-02 21:28:29 +0000