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Message-ID: <1508325388-7260-3-git-send-email-xuejiancheng@hisilicon.com>
Date: Wed, 18 Oct 2017 07:16:28 -0400
From: Jiancheng Xue <xuejiancheng@...ilicon.com>
To: <ulf.hansson@...aro.org>, <robh+dt@...nel.org>,
<jh80.chung@...sung.com>
CC: <linux-mmc@...r.kernel.org>, <devicetree@...r.kernel.org>,
<linux-kernel@...r.kernel.org>, <shawn.guo@...aro.org>,
<project-aspen-dev@...aro.org>, <xuejiancheng@...ilicon.com>,
<hermit.wangheming@...ilicon.com>,
tianshuliang <tianshuliang@...ilicon.com>
Subject: [PATCH 2/2] mmc: dw_mmc: add support for hi3798cv200 specific extensions of dw-mshc
From: tianshuliang <tianshuliang@...ilicon.com>
Hi3798cv200 SoC extends the dw-mshc controller for additional clock
and bus control. Add support for these extensions.
Signed-off-by: tianshuliang <tianshuliang@...ilicon.com>
Signed-off-by: Jiancheng Xue <xuejiancheng@...ilicon.com>
---
drivers/mmc/host/Kconfig | 9 ++
drivers/mmc/host/Makefile | 1 +
drivers/mmc/host/dw_mmc-hi3798cv200.c | 191 ++++++++++++++++++++++++++++++++++
3 files changed, 201 insertions(+)
create mode 100644 drivers/mmc/host/dw_mmc-hi3798cv200.c
diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
index 8c15637..2bf6aa8 100644
--- a/drivers/mmc/host/Kconfig
+++ b/drivers/mmc/host/Kconfig
@@ -712,6 +712,15 @@ config MMC_DW_K3
Synopsys DesignWare Memory Card Interface driver. Select this option
for platforms based on Hisilicon K3 SoC's.
+config MMC_DW_HI3798CV200
+ tristate "Hi3798cv200 specific extensions for Synopsys DW Memory Card Interface"
+ depends on MMC_DW
+ select MMC_DW_PLTFM
+ help
+ This selects support for HiSilicon hi3798cv200 SoC specific extensions to the
+ Synopsys DesignWare Memory Card Interface driver. Select this option
+ for platforms based on HiSilicon hi3798cv200 SoC's.
+
config MMC_DW_PCI
tristate "Synopsys Designware MCI support on PCI bus"
depends on MMC_DW && PCI
diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile
index 303f5cd..6e015d8 100644
--- a/drivers/mmc/host/Makefile
+++ b/drivers/mmc/host/Makefile
@@ -54,6 +54,7 @@ obj-$(CONFIG_MMC_CAVIUM_THUNDERX) += thunderx-mmc.o
obj-$(CONFIG_MMC_DW) += dw_mmc.o
obj-$(CONFIG_MMC_DW_PLTFM) += dw_mmc-pltfm.o
obj-$(CONFIG_MMC_DW_EXYNOS) += dw_mmc-exynos.o
+obj-$(CONFIG_MMC_DW_HI3798CV200) += dw_mmc-hi3798cv200.o
obj-$(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
diff --git a/drivers/mmc/host/dw_mmc-hi3798cv200.c b/drivers/mmc/host/dw_mmc-hi3798cv200.c
new file mode 100644
index 0000000..bd24001
--- /dev/null
+++ b/drivers/mmc/host/dw_mmc-hi3798cv200.c
@@ -0,0 +1,191 @@
+/*
+ * Copyright (c) 2017 HiSilicon Technologies Co., Ltd.
+ *
+ * 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/module.h>
+#include <linux/of_address.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
+
+#include "dw_mmc.h"
+#include "dw_mmc-pltfm.h"
+
+#define ALL_INT_CLR 0x1EFFF
+
+#define SDMMC_DDR_REG 0x10c
+#define SDMMC_ENABLE_SH 0x110
+#define SDMMC_DDR_HS400 BIT(31)
+#define SDMMC_ENABLE_SH_PHASE BIT(0)
+#define SDMMC_DRV_PS_135 3
+#define SDMMC_DRV_PS_180 4
+
+struct hi3798cv200_priv {
+ struct clk *sample_clk;
+ struct clk *drive_clk;
+};
+
+static void dw_mci_hi3798cv200_set_ios(struct dw_mci *host, struct mmc_ios *ios)
+{
+ u32 regs;
+ struct hi3798cv200_priv *priv = host->priv;
+ u32 drive_phase[] = {0, 45, 90, 135, 180, 225, 270, 315};
+
+ regs = mci_readl(host, UHS_REG);
+ if (ios->timing == MMC_TIMING_MMC_HS400)
+ regs &= ~(0x1 << 16);
+ mci_writel(host, UHS_REG, regs);
+
+ regs = mci_readl(host, ENABLE_SH);
+ if (ios->timing == MMC_TIMING_MMC_DDR52)
+ regs |= SDMMC_ENABLE_SH_PHASE;
+ else
+ regs &= ~SDMMC_ENABLE_SH_PHASE;
+ mci_writel(host, ENABLE_SH, regs);
+
+ regs = mci_readl(host, DDR_REG);
+ if (ios->timing == MMC_TIMING_MMC_HS400)
+ regs |= SDMMC_DDR_HS400;
+ else
+ regs &= ~SDMMC_DDR_HS400;
+ mci_writel(host, DDR_REG, regs);
+
+ if ((ios->timing == MMC_TIMING_MMC_HS) ||
+ (ios->timing == MMC_TIMING_LEGACY))
+ clk_set_phase(priv->drive_clk, drive_phase[SDMMC_DRV_PS_180]);
+ else if (ios->timing == MMC_TIMING_MMC_HS200)
+ clk_set_phase(priv->drive_clk, drive_phase[SDMMC_DRV_PS_135]);
+}
+
+static int
+dw_mci_hi3798cv200_execute_tuning(struct dw_mci_slot *slot, u32 opcode)
+{
+ struct dw_mci *host = slot->host;
+ struct hi3798cv200_priv *priv = host->priv;
+ u32 index, found = 0;
+ u32 sample_phase[] = {0, 45, 90, 135, 180, 225, 270, 315};
+ int err = 0, raise_point = -1, fall_point = -1, prev_err = -1;
+
+ for (index = 0; index < ARRAY_SIZE(sample_phase); index++) {
+ clk_set_phase(priv->sample_clk, sample_phase[index]);
+ mci_writel(host, RINTSTS, ALL_INT_CLR);
+
+ err = mmc_send_tuning(slot->mmc, opcode, NULL);
+ if (!err)
+ found = 1;
+ if (index > 0) {
+ if (err && !prev_err)
+ fall_point = index - 1;
+ if (!err && prev_err)
+ raise_point = index;
+ }
+
+ if ((raise_point != -1) && (fall_point != -1))
+ goto tuning_out;
+ prev_err = err;
+ err = 0;
+ }
+
+tuning_out:
+ if (found) {
+ if (raise_point == -1)
+ raise_point = 0;
+ if (fall_point == -1)
+ fall_point = ARRAY_SIZE(sample_phase)-1;
+ if (fall_point < raise_point) {
+ if ((raise_point + fall_point)
+ > (ARRAY_SIZE(sample_phase) - 1))
+ index = fall_point / 2;
+ else
+ index = (raise_point +
+ ARRAY_SIZE(sample_phase) - 1) / 2;
+ } else
+ index = (raise_point + fall_point) / 2;
+
+ clk_set_phase(priv->sample_clk, sample_phase[index]);
+ dev_dbg(host->dev, "Tuning clk_sample[%d, %d], set[%d]\n",
+ raise_point, fall_point, sample_phase[index]);
+ } else {
+ mci_writel(host, RINTSTS, ALL_INT_CLR);
+ dev_err(host->dev, "No valid clk_sample shift! use default\n");
+ return -1;
+ }
+ mci_writel(host, RINTSTS, ALL_INT_CLR);
+ return err;
+}
+
+static int dw_mci_hi3798cv200_dt(struct dw_mci *host)
+{
+ struct hi3798cv200_priv *priv;
+
+ priv = devm_kzalloc(host->dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ priv->sample_clk = devm_clk_get(host->dev, "ciu-sample");
+ if (IS_ERR(priv->sample_clk))
+ dev_dbg(host->dev, "ciu-sample not available\n");
+ else {
+ if (clk_prepare_enable(priv->sample_clk))
+ dev_err(host->dev, "failed to enable ciu-sample clock\n");
+ }
+
+ priv->drive_clk = devm_clk_get(host->dev, "ciu-drive");
+ if (IS_ERR(priv->drive_clk))
+ dev_dbg(host->dev, "ciu-drive not available\n");
+ else {
+ if (clk_prepare_enable(priv->drive_clk))
+ dev_err(host->dev, "failed to enable ciu-drive clock\n");
+ }
+
+ host->priv = priv;
+
+ return 0;
+}
+
+static const struct dw_mci_drv_data hi3798cv200_data = {
+ .set_ios = dw_mci_hi3798cv200_set_ios,
+ .parse_dt = dw_mci_hi3798cv200_dt,
+ .execute_tuning = dw_mci_hi3798cv200_execute_tuning,
+};
+
+static const struct of_device_id dw_mci_hi3798cv200_match[] = {
+ { .compatible = "hisilicon,hi3798cv200-dw-mshc",
+ .data = &hi3798cv200_data, },
+ {},
+};
+MODULE_DEVICE_TABLE(of, dw_mci_hi3798cv200_match);
+
+static int dw_mci_hi3798cv200_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_hi3798cv200_match, pdev->dev.of_node);
+ drv_data = match->data;
+
+ return dw_mci_pltfm_register(pdev, drv_data);
+}
+
+static struct platform_driver dw_mci_hi3798cv200_pltfm_driver = {
+ .probe = dw_mci_hi3798cv200_probe,
+ .remove = dw_mci_pltfm_remove,
+ .driver = {
+ .name = "dwmmc_hi3798cv200",
+ .of_match_table = dw_mci_hi3798cv200_match,
+ },
+};
+
+module_platform_driver(dw_mci_hi3798cv200_pltfm_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("MMC driver for the Hisilicon MMC Host Controller");
--
2.7.4
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