mmc: dw_mmc: zx: Initial support for ZX mmc controller (a8c643ad) · Commits · 戴 / test

drivers/mmc/host/Kconfig

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		@@ -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

drivers/mmc/host/Makefile

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		@@ -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

drivers/mmc/host/dw_mmc-zx.c

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		/*
		* 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");

drivers/mmc/host/dw_mmc-zx.h

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		#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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