#include <linux/dma-mapping.h>
#include <linux/highmem.h>
#include <linux/iopoll.h>
+#include <linux/mmc/host.h>
+#include <linux/mmc/mmc.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_gpio.h>
#define SDHCI_SPRD_CLK_DEF_RATE 26000000
#define SDHCI_SPRD_PHY_DLL_CLK 52000000
+#define SDHCI_SPRD_MAX_RANGE 0xff
+#define SDHCI_SPRD_CMD_DLY_MASK GENMASK(15, 8)
+#define SDHCI_SPRD_POSRD_DLY_MASK GENMASK(23, 16)
+#define SDHCI_SPRD_CPST_EN GENMASK(27, 24)
+
struct sdhci_sprd_host {
u32 version;
struct clk *clk_sdio;
u32 phy_delay[MMC_TIMING_MMC_HS400 + 2];
};
+enum sdhci_sprd_tuning_type {
+ SDHCI_SPRD_TUNING_SD_HS_CMD,
+ SDHCI_SPRD_TUNING_SD_HS_DATA,
+};
+
struct sdhci_sprd_phy_cfg {
const char *property;
u8 timing;
SDHCI_SPRD_REG_32_DLL_DLY);
}
+static int mmc_send_tuning_cmd(struct mmc_card *card)
+{
+ return mmc_send_status(card, NULL);
+}
+
+static int mmc_send_tuning_data(struct mmc_card *card)
+{
+ u8 *status;
+ int ret;
+
+ status = kmalloc(64, GFP_KERNEL);
+ if (!status)
+ return -ENOMEM;
+
+ ret = mmc_sd_switch(card, 0, 0, 0, status);
+
+ kfree(status);
+
+ return ret;
+}
+
+static int sdhci_sprd_get_best_clk_sample(struct mmc_host *mmc, u8 *value)
+{
+ int range_end = SDHCI_SPRD_MAX_RANGE;
+ int range_length = 0;
+ int middle_range = 0;
+ int count = 0;
+ int i;
+
+ for (i = 0; i <= SDHCI_SPRD_MAX_RANGE; i++) {
+ if (value[i]) {
+ pr_debug("%s: tuning ok: %d\n", mmc_hostname(mmc), i);
+ count++;
+ } else {
+ pr_debug("%s: tuning fail: %d\n", mmc_hostname(mmc), i);
+ if (range_length < count) {
+ range_length = count;
+ range_end = i - 1;
+ count = 0;
+ }
+ }
+ }
+
+ if (!count)
+ return -EIO;
+
+ if (count > range_length) {
+ range_length = count;
+ range_end = i - 1;
+ }
+
+ middle_range = range_end - (range_length - 1) / 2;
+
+ return middle_range;
+}
+
+static int sdhci_sprd_tuning(struct mmc_host *mmc, struct mmc_card *card,
+ enum sdhci_sprd_tuning_type type)
+{
+ struct sdhci_host *host = mmc_priv(mmc);
+ struct sdhci_sprd_host *sprd_host = TO_SPRD_HOST(host);
+ u32 *p = sprd_host->phy_delay;
+ u32 dll_cfg, dll_dly;
+ int best_clk_sample;
+ int err = 0;
+ u8 *value;
+ int i;
+
+ value = kmalloc(SDHCI_SPRD_MAX_RANGE + 1, GFP_KERNEL);
+ if (!value)
+ return -ENOMEM;
+
+ sdhci_reset(host, SDHCI_RESET_CMD | SDHCI_RESET_DATA);
+
+ dll_cfg = sdhci_readl(host, SDHCI_SPRD_REG_32_DLL_CFG);
+ dll_cfg &= ~SDHCI_SPRD_CPST_EN;
+ sdhci_writel(host, dll_cfg, SDHCI_SPRD_REG_32_DLL_CFG);
+
+ dll_dly = p[mmc->ios.timing];
+
+ for (i = 0; i <= SDHCI_SPRD_MAX_RANGE; i++) {
+ if (type == SDHCI_SPRD_TUNING_SD_HS_CMD) {
+ dll_dly &= ~SDHCI_SPRD_CMD_DLY_MASK;
+ dll_dly |= ((i << 8) & SDHCI_SPRD_CMD_DLY_MASK);
+ } else {
+ dll_dly &= ~SDHCI_SPRD_POSRD_DLY_MASK;
+ dll_dly |= ((i << 16) & SDHCI_SPRD_POSRD_DLY_MASK);
+ }
+
+ sdhci_writel(host, dll_dly, SDHCI_SPRD_REG_32_DLL_DLY);
+
+ if (type == SDHCI_SPRD_TUNING_SD_HS_CMD)
+ value[i] = !mmc_send_tuning_cmd(card);
+ else
+ value[i] = !mmc_send_tuning_data(card);
+ }
+
+ best_clk_sample = sdhci_sprd_get_best_clk_sample(mmc, value);
+ if (best_clk_sample < 0) {
+ dev_err(mmc_dev(host->mmc), "all tuning phase fail!\n");
+ goto out;
+ }
+
+ if (type == SDHCI_SPRD_TUNING_SD_HS_CMD) {
+ p[mmc->ios.timing] &= ~SDHCI_SPRD_CMD_DLY_MASK;
+ p[mmc->ios.timing] |= ((best_clk_sample << 8) & SDHCI_SPRD_CMD_DLY_MASK);
+ } else {
+ p[mmc->ios.timing] &= ~(SDHCI_SPRD_POSRD_DLY_MASK);
+ p[mmc->ios.timing] |= ((best_clk_sample << 16) & SDHCI_SPRD_POSRD_DLY_MASK);
+ }
+
+ pr_debug("%s: the best clk sample %d, delay value 0x%08x\n",
+ mmc_hostname(host->mmc), best_clk_sample, p[mmc->ios.timing]);
+
+out:
+ sdhci_writel(host, p[mmc->ios.timing], SDHCI_SPRD_REG_32_DLL_DLY);
+
+ kfree(value);
+
+ return err;
+}
+
+static int sdhci_sprd_prepare_sd_hs_cmd_tuning(struct mmc_host *mmc, struct mmc_card *card)
+{
+ return sdhci_sprd_tuning(mmc, card, SDHCI_SPRD_TUNING_SD_HS_CMD);
+}
+
+static int sdhci_sprd_execute_sd_hs_data_tuning(struct mmc_host *mmc, struct mmc_card *card)
+{
+ return sdhci_sprd_tuning(mmc, card, SDHCI_SPRD_TUNING_SD_HS_DATA);
+}
+
static void sdhci_sprd_phy_param_parse(struct sdhci_sprd_host *sprd_host,
struct device_node *np)
{
host->mmc_host_ops.request = sdhci_sprd_request;
host->mmc_host_ops.hs400_enhanced_strobe =
sdhci_sprd_hs400_enhanced_strobe;
+ host->mmc_host_ops.prepare_sd_hs_tuning =
+ sdhci_sprd_prepare_sd_hs_cmd_tuning;
+ host->mmc_host_ops.execute_sd_hs_tuning =
+ sdhci_sprd_execute_sd_hs_data_tuning;
+
/*
* We can not use the standard ops to change and detect the voltage
* signal for Spreadtrum SD host controller, since our voltage regulator