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-rw-r--r--drivers/mmc/host/Kconfig9
-rw-r--r--drivers/mmc/host/Makefile1
-rw-r--r--drivers/mmc/host/dw_mmc-zx.c241
-rw-r--r--drivers/mmc/host/dw_mmc-zx.h31
4 files changed, 282 insertions, 0 deletions
diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
index 2eb97014dc3f..f08691a58d7e 100644
--- a/drivers/mmc/host/Kconfig
+++ b/drivers/mmc/host/Kconfig
@@ -683,6 +683,15 @@ config MMC_DW_ROCKCHIP
Synopsys DesignWare Memory Card Interface driver. Select this option
for platforms based on RK3066, RK3188 and RK3288 SoC's.
+config MMC_DW_ZX
+ tristate "ZTE specific extensions for Synopsys DW Memory Card Interface"
+ depends on MMC_DW && ARCH_ZX
+ select MMC_DW_PLTFM
+ help
+ This selects support for ZTE SoC specific extensions to the
+ Synopsys DesignWare Memory Card Interface driver. Select this option
+ for platforms based on ZX296718 SoC's.
+
config MMC_SH_MMCIF
tristate "SuperH Internal MMCIF support"
depends on HAS_DMA
diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile
index ccc9c4cba154..6d548c4ee2fa 100644
--- a/drivers/mmc/host/Makefile
+++ b/drivers/mmc/host/Makefile
@@ -48,6 +48,7 @@ obj-$(CONFIG_MMC_DW_EXYNOS) += dw_mmc-exynos.o
obj-$(CONFIG_MMC_DW_K3) += dw_mmc-k3.o
obj-$(CONFIG_MMC_DW_PCI) += dw_mmc-pci.o
obj-$(CONFIG_MMC_DW_ROCKCHIP) += dw_mmc-rockchip.o
+obj-$(CONFIG_MMC_DW_ZX) += dw_mmc-zx.o
obj-$(CONFIG_MMC_SH_MMCIF) += sh_mmcif.o
obj-$(CONFIG_MMC_JZ4740) += jz4740_mmc.o
obj-$(CONFIG_MMC_VUB300) += vub300.o
diff --git a/drivers/mmc/host/dw_mmc-zx.c b/drivers/mmc/host/dw_mmc-zx.c
new file mode 100644
index 000000000000..d38e94ae2b85
--- /dev/null
+++ b/drivers/mmc/host/dw_mmc-zx.c
@@ -0,0 +1,241 @@
+/*
+ * ZX Specific Extensions for Synopsys DW Multimedia Card Interface driver
+ *
+ * Copyright (C) 2016, Linaro Ltd.
+ * Copyright (C) 2016, ZTE Corp.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/clk.h>
+#include <linux/mfd/syscon.h>
+#include <linux/mmc/host.h>
+#include <linux/mmc/mmc.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+
+#include "dw_mmc.h"
+#include "dw_mmc-pltfm.h"
+#include "dw_mmc-zx.h"
+
+struct dw_mci_zx_priv_data {
+ struct regmap *sysc_base;
+};
+
+enum delay_type {
+ DELAY_TYPE_READ, /* read dqs delay */
+ DELAY_TYPE_CLK, /* clk sample delay */
+};
+
+static int dw_mci_zx_emmc_set_delay(struct dw_mci *host, unsigned int delay,
+ enum delay_type dflag)
+{
+ struct dw_mci_zx_priv_data *priv = host->priv;
+ struct regmap *sysc_base = priv->sysc_base;
+ unsigned int clksel;
+ unsigned int loop = 1000;
+ int ret;
+
+ if (!sysc_base)
+ return -EINVAL;
+
+ ret = regmap_update_bits(sysc_base, LB_AON_EMMC_CFG_REG0,
+ PARA_HALF_CLK_MODE | PARA_DLL_BYPASS_MODE |
+ PARA_PHASE_DET_SEL_MASK |
+ PARA_DLL_LOCK_NUM_MASK |
+ DLL_REG_SET | PARA_DLL_START_MASK,
+ PARA_DLL_START(4) | PARA_DLL_LOCK_NUM(4));
+ if (ret)
+ return ret;
+
+ ret = regmap_read(sysc_base, LB_AON_EMMC_CFG_REG1, &clksel);
+ if (ret)
+ return ret;
+
+ if (dflag == DELAY_TYPE_CLK) {
+ clksel &= ~CLK_SAMP_DELAY_MASK;
+ clksel |= CLK_SAMP_DELAY(delay);
+ } else {
+ clksel &= ~READ_DQS_DELAY_MASK;
+ clksel |= READ_DQS_DELAY(delay);
+ }
+
+ regmap_write(sysc_base, LB_AON_EMMC_CFG_REG1, clksel);
+ regmap_update_bits(sysc_base, LB_AON_EMMC_CFG_REG0,
+ PARA_DLL_START_MASK | PARA_DLL_LOCK_NUM_MASK |
+ DLL_REG_SET,
+ PARA_DLL_START(4) | PARA_DLL_LOCK_NUM(4) |
+ DLL_REG_SET);
+
+ do {
+ ret = regmap_read(sysc_base, LB_AON_EMMC_CFG_REG2, &clksel);
+ if (ret)
+ return ret;
+
+ } while (--loop && !(clksel & ZX_DLL_LOCKED));
+
+ if (!loop) {
+ dev_err(host->dev, "Error: %s dll lock fail\n", __func__);
+ return -EIO;
+ }
+
+ return 0;
+}
+
+static int dw_mci_zx_emmc_execute_tuning(struct dw_mci_slot *slot, u32 opcode)
+{
+ struct dw_mci *host = slot->host;
+ struct mmc_host *mmc = slot->mmc;
+ int ret, len = 0, start = 0, end = 0, delay, best = 0;
+
+ for (delay = 1; delay < 128; delay++) {
+ ret = dw_mci_zx_emmc_set_delay(host, delay, DELAY_TYPE_CLK);
+ if (!ret && mmc_send_tuning(mmc, opcode, NULL)) {
+ if (start >= 0) {
+ end = delay - 1;
+ /* check and update longest good range */
+ if ((end - start) > len) {
+ best = (start + end) >> 1;
+ len = end - start;
+ }
+ }
+ start = -1;
+ end = 0;
+ continue;
+ }
+ if (start < 0)
+ start = delay;
+ }
+
+ if (start >= 0) {
+ end = delay - 1;
+ if ((end - start) > len) {
+ best = (start + end) >> 1;
+ len = end - start;
+ }
+ }
+ if (best < 0)
+ return -EIO;
+
+ dev_info(host->dev, "%s best range: start %d end %d\n", __func__,
+ start, end);
+ return dw_mci_zx_emmc_set_delay(host, best, DELAY_TYPE_CLK);
+}
+
+static int dw_mci_zx_prepare_hs400_tuning(struct dw_mci *host,
+ struct mmc_ios *ios)
+{
+ int ret;
+
+ /* config phase shift as 90 degree */
+ ret = dw_mci_zx_emmc_set_delay(host, 32, DELAY_TYPE_READ);
+ if (ret < 0)
+ return -EIO;
+
+ return 0;
+}
+
+static int dw_mci_zx_execute_tuning(struct dw_mci_slot *slot, u32 opcode)
+{
+ struct dw_mci *host = slot->host;
+
+ if (host->verid == 0x290a) /* only for emmc */
+ return dw_mci_zx_emmc_execute_tuning(slot, opcode);
+ /* TODO: Add 0x210a dedicated tuning for sd/sdio */
+
+ return 0;
+}
+
+static int dw_mci_zx_parse_dt(struct dw_mci *host)
+{
+ struct device_node *np = host->dev->of_node;
+ struct device_node *node;
+ struct dw_mci_zx_priv_data *priv;
+ struct regmap *sysc_base;
+ int ret;
+
+ /* syscon is needed only by emmc */
+ node = of_parse_phandle(np, "zte,aon-syscon", 0);
+ if (node) {
+ sysc_base = syscon_node_to_regmap(node);
+ of_node_put(node);
+
+ if (IS_ERR(sysc_base)) {
+ ret = PTR_ERR(sysc_base);
+ if (ret != -EPROBE_DEFER)
+ dev_err(host->dev, "Can't get syscon: %d\n",
+ ret);
+ return ret;
+ }
+ } else {
+ return 0;
+ }
+
+ priv = devm_kzalloc(host->dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+ priv->sysc_base = sysc_base;
+ host->priv = priv;
+
+ return 0;
+}
+
+static unsigned long zx_dwmmc_caps[3] = {
+ MMC_CAP_CMD23,
+ MMC_CAP_CMD23,
+ MMC_CAP_CMD23,
+};
+
+static const struct dw_mci_drv_data zx_drv_data = {
+ .caps = zx_dwmmc_caps,
+ .execute_tuning = dw_mci_zx_execute_tuning,
+ .prepare_hs400_tuning = dw_mci_zx_prepare_hs400_tuning,
+ .parse_dt = dw_mci_zx_parse_dt,
+};
+
+static const struct of_device_id dw_mci_zx_match[] = {
+ { .compatible = "zte,zx296718-dw-mshc", .data = &zx_drv_data},
+ {},
+};
+MODULE_DEVICE_TABLE(of, dw_mci_zx_match);
+
+static int dw_mci_zx_probe(struct platform_device *pdev)
+{
+ const struct dw_mci_drv_data *drv_data;
+ const struct of_device_id *match;
+
+ match = of_match_node(dw_mci_zx_match, pdev->dev.of_node);
+ drv_data = match->data;
+
+ return dw_mci_pltfm_register(pdev, drv_data);
+}
+
+static const struct dev_pm_ops dw_mci_zx_dev_pm_ops = {
+ SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
+ pm_runtime_force_resume)
+ SET_RUNTIME_PM_OPS(dw_mci_runtime_suspend,
+ dw_mci_runtime_resume,
+ NULL)
+};
+
+static struct platform_driver dw_mci_zx_pltfm_driver = {
+ .probe = dw_mci_zx_probe,
+ .remove = dw_mci_pltfm_remove,
+ .driver = {
+ .name = "dwmmc_zx",
+ .of_match_table = dw_mci_zx_match,
+ .pm = &dw_mci_zx_dev_pm_ops,
+ },
+};
+
+module_platform_driver(dw_mci_zx_pltfm_driver);
+
+MODULE_DESCRIPTION("ZTE emmc/sd driver");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/mmc/host/dw_mmc-zx.h b/drivers/mmc/host/dw_mmc-zx.h
new file mode 100644
index 000000000000..f369997a39ec
--- /dev/null
+++ b/drivers/mmc/host/dw_mmc-zx.h
@@ -0,0 +1,31 @@
+#ifndef _DW_MMC_ZX_H_
+#define _DW_MMC_ZX_H_
+
+/* ZX296718 SoC specific DLL register offset. */
+#define LB_AON_EMMC_CFG_REG0 0x1B0
+#define LB_AON_EMMC_CFG_REG1 0x1B4
+#define LB_AON_EMMC_CFG_REG2 0x1B8
+
+/* LB_AON_EMMC_CFG_REG0 register defines */
+#define PARA_DLL_START(x) ((x) & 0xFF)
+#define PARA_DLL_START_MASK 0xFF
+#define DLL_REG_SET BIT(8)
+#define PARA_DLL_LOCK_NUM(x) (((x) & 7) << 16)
+#define PARA_DLL_LOCK_NUM_MASK (7 << 16)
+#define PARA_PHASE_DET_SEL(x) (((x) & 7) << 20)
+#define PARA_PHASE_DET_SEL_MASK (7 << 20)
+#define PARA_DLL_BYPASS_MODE BIT(23)
+#define PARA_HALF_CLK_MODE BIT(24)
+
+/* LB_AON_EMMC_CFG_REG1 register defines */
+#define READ_DQS_DELAY(x) ((x) & 0x7F)
+#define READ_DQS_DELAY_MASK (0x7F)
+#define READ_DQS_BYPASS_MODE BIT(7)
+#define CLK_SAMP_DELAY(x) (((x) & 0x7F) << 8)
+#define CLK_SAMP_DELAY_MASK (0x7F << 8)
+#define CLK_SAMP_BYPASS_MODE BIT(15)
+
+/* LB_AON_EMMC_CFG_REG2 register defines */
+#define ZX_DLL_LOCKED BIT(2)
+
+#endif /* _DW_MMC_ZX_H_ */
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