Re: [PATCH v4] MMC: meson: initial support for GX platforms

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On 18 October 2016 at 21:56, Kevin Hilman <khilman@xxxxxxxxxxxx> wrote:
> Initial support for the SD/eMMC controller in the Amlogic S905/GX*
> family of SoCs.
>
> Signed-off-by: Kevin Hilman <khilman@xxxxxxxxxxxx>
> ---
> Changes from v3:
> - better handling of clock error paths
> - rename to meson-gx to reflect support for newer SoCs
> - has now been tested with SDIO
>
>  .../devicetree/bindings/mmc/amlogic,meson-gxbb.txt |  33 +

Just realize this. You should split the DT doc into a separate patch,
such the DT maintainers can ack it.

Otherwise this looks good to me!

Kind regards
Uffe


>  MAINTAINERS                                        |   1 +
>  drivers/mmc/host/Kconfig                           |  10 +
>  drivers/mmc/host/Makefile                          |   1 +
>  drivers/mmc/host/meson-gx.c                        | 853 +++++++++++++++++++++
>  5 files changed, 898 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/mmc/amlogic,meson-gxbb.txt
>  create mode 100644 drivers/mmc/host/meson-gx.c
>
> diff --git a/Documentation/devicetree/bindings/mmc/amlogic,meson-gxbb.txt b/Documentation/devicetree/bindings/mmc/amlogic,meson-gxbb.txt
> new file mode 100644
> index 000000000000..a2fa9a1c26ae
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mmc/amlogic,meson-gxbb.txt
> @@ -0,0 +1,33 @@
> +Amlogic SD / eMMC controller for S905/GXBB family SoCs
> +
> +The MMC 5.1 compliant host controller on Amlogic provides the
> +interface for SD, eMMC and SDIO devices.
> +
> +This file documents the properties in addition to those available in
> +the MMC core bindings, documented by mmc.txt.
> +
> +Required properties:
> +- compatible : contains one of:
> +  - "amlogic,meson-gx-mmc"
> +  - "amlogic,meson-gxbb-mmc"
> +  - "amlogic,meson-gxl-mmc"
> +  - "amlogic,meson-gxm-mmc"
> +- clocks     : A list of phandle + clock-specifier pairs for the clocks listed in clock-names.
> +- clock-names: Should contain the following:
> +       "core" - Main peripheral bus clock
> +       "clkin0" - Parent clock of internal mux
> +       "clkin1" - Other parent clock of internal mux
> +  The driver has an interal mux clock which switches between clkin0 and clkin1 depending on the
> +  clock rate requested by the MMC core.
> +
> +Example:
> +
> +       sd_emmc_a: mmc@70000 {
> +               compatible = "amlogic,meson-gxbb-mmc";
> +               reg = <0x0 0x70000 0x0 0x2000>;
> +                interrupts = < GIC_SPI 216 IRQ_TYPE_EDGE_RISING>;
> +               clocks = <&clkc CLKID_SD_EMMC_A>, <&xtal>, <&clkc CLKID_FCLK_DIV2>;
> +               clock-names = "core", "clkin0", "clkin1";
> +               pinctrl-0 = <&emmc_pins>;
> +       };
> +
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 1cd38a7e0064..73e8d64ec28c 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -1036,6 +1036,7 @@ F:        arch/arm/mach-meson/
>  F:     arch/arm/boot/dts/meson*
>  F:     arch/arm64/boot/dts/amlogic/
>  F:     drivers/pinctrl/meson/
> +F:     drivers/mmc/host/meson*
>  N:     meson
>
>  ARM/Annapurna Labs ALPINE ARCHITECTURE
> diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
> index 5274f503a39a..5cf7ebaf1e8b 100644
> --- a/drivers/mmc/host/Kconfig
> +++ b/drivers/mmc/host/Kconfig
> @@ -322,6 +322,16 @@ config MMC_SDHCI_IPROC
>
>           If unsure, say N.
>
> +config MMC_MESON_GX
> +       tristate "Amlogic S905/GX* SD/MMC Host Controller support"
> +       depends on ARCH_MESON && MMC
> +       help
> +         This selects support for the Amlogic SD/MMC Host Controller
> +         found on the S905/GX* family of SoCs.  This controller is
> +         MMC 5.1 compliant and supports SD, eMMC and SDIO interfaces.
> +
> +         If you have a controller with this interface, say Y here.
> +
>  config MMC_MOXART
>         tristate "MOXART SD/MMC Host Controller support"
>         depends on ARCH_MOXART && MMC
> diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile
> index e2bdaaf43184..1c4852999ae4 100644
> --- a/drivers/mmc/host/Makefile
> +++ b/drivers/mmc/host/Makefile
> @@ -53,6 +53,7 @@ obj-$(CONFIG_MMC_JZ4740)      += jz4740_mmc.o
>  obj-$(CONFIG_MMC_VUB300)       += vub300.o
>  obj-$(CONFIG_MMC_USHC)         += ushc.o
>  obj-$(CONFIG_MMC_WMT)          += wmt-sdmmc.o
> +obj-$(CONFIG_MMC_MESON_GX)     += meson-gx.o
>  obj-$(CONFIG_MMC_MOXART)       += moxart-mmc.o
>  obj-$(CONFIG_MMC_SUNXI)                += sunxi-mmc.o
>  obj-$(CONFIG_MMC_USDHI6ROL0)   += usdhi6rol0.o
> diff --git a/drivers/mmc/host/meson-gx.c b/drivers/mmc/host/meson-gx.c
> new file mode 100644
> index 000000000000..fd3c40322b2d
> --- /dev/null
> +++ b/drivers/mmc/host/meson-gx.c
> @@ -0,0 +1,853 @@
> +/*
> + * Amlogic SD/eMMC driver for the GX/S905 family SoCs
> + *
> + * Copyright (c) 2016 BayLibre, SAS.
> + * Author: Kevin Hilman <khilman@xxxxxxxxxxxx>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of version 2 of the GNU General Public License as
> + * published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful, but
> + * WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> + * General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program; if not, see <http://www.gnu.org/licenses/>.
> + * The full GNU General Public License is included in this distribution
> + * in the file called COPYING.
> + */
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/init.h>
> +#include <linux/device.h>
> +#include <linux/of_device.h>
> +#include <linux/platform_device.h>
> +#include <linux/ioport.h>
> +#include <linux/spinlock.h>
> +#include <linux/dma-mapping.h>
> +#include <linux/mmc/host.h>
> +#include <linux/mmc/mmc.h>
> +#include <linux/mmc/sdio.h>
> +#include <linux/mmc/slot-gpio.h>
> +#include <linux/io.h>
> +#include <linux/clk.h>
> +#include <linux/clk-provider.h>
> +#include <linux/regulator/consumer.h>
> +
> +#define DRIVER_NAME "meson-gxbb-mmc"
> +
> +#define SD_EMMC_CLOCK 0x0
> +#define   CLK_DIV_SHIFT 0
> +#define   CLK_DIV_WIDTH 6
> +#define   CLK_DIV_MASK 0x3f
> +#define   CLK_DIV_MAX 63
> +#define   CLK_SRC_SHIFT 6
> +#define   CLK_SRC_WIDTH 2
> +#define   CLK_SRC_MASK 0x3
> +#define   CLK_SRC_XTAL 0   /* external crystal */
> +#define   CLK_SRC_XTAL_RATE 24000000
> +#define   CLK_SRC_PLL 1    /* FCLK_DIV2 */
> +#define   CLK_SRC_PLL_RATE 1000000000
> +#define   CLK_PHASE_SHIFT 8
> +#define   CLK_PHASE_MASK 0x3
> +#define   CLK_PHASE_0 0
> +#define   CLK_PHASE_90 1
> +#define   CLK_PHASE_180 2
> +#define   CLK_PHASE_270 3
> +#define   CLK_ALWAYS_ON BIT(24)
> +
> +#define SD_EMMC_DElAY 0x4
> +#define SD_EMMC_ADJUST 0x8
> +#define SD_EMMC_CALOUT 0x10
> +#define SD_EMMC_START 0x40
> +#define   START_DESC_INIT BIT(0)
> +#define   START_DESC_BUSY BIT(1)
> +#define   START_DESC_ADDR_SHIFT 2
> +#define   START_DESC_ADDR_MASK (~0x3)
> +
> +#define SD_EMMC_CFG 0x44
> +#define   CFG_BUS_WIDTH_SHIFT 0
> +#define   CFG_BUS_WIDTH_MASK 0x3
> +#define   CFG_BUS_WIDTH_1 0x0
> +#define   CFG_BUS_WIDTH_4 0x1
> +#define   CFG_BUS_WIDTH_8 0x2
> +#define   CFG_DDR BIT(2)
> +#define   CFG_BLK_LEN_SHIFT 4
> +#define   CFG_BLK_LEN_MASK 0xf
> +#define   CFG_RESP_TIMEOUT_SHIFT 8
> +#define   CFG_RESP_TIMEOUT_MASK 0xf
> +#define   CFG_RC_CC_SHIFT 12
> +#define   CFG_RC_CC_MASK 0xf
> +#define   CFG_STOP_CLOCK BIT(22)
> +#define   CFG_CLK_ALWAYS_ON BIT(18)
> +#define   CFG_AUTO_CLK BIT(23)
> +
> +#define SD_EMMC_STATUS 0x48
> +#define   STATUS_BUSY BIT(31)
> +
> +#define SD_EMMC_IRQ_EN 0x4c
> +#define   IRQ_EN_MASK 0x3fff
> +#define   IRQ_RXD_ERR_SHIFT 0
> +#define   IRQ_RXD_ERR_MASK 0xff
> +#define   IRQ_TXD_ERR BIT(8)
> +#define   IRQ_DESC_ERR BIT(9)
> +#define   IRQ_RESP_ERR BIT(10)
> +#define   IRQ_RESP_TIMEOUT BIT(11)
> +#define   IRQ_DESC_TIMEOUT BIT(12)
> +#define   IRQ_END_OF_CHAIN BIT(13)
> +#define   IRQ_RESP_STATUS BIT(14)
> +#define   IRQ_SDIO BIT(15)
> +
> +#define SD_EMMC_CMD_CFG 0x50
> +#define SD_EMMC_CMD_ARG 0x54
> +#define SD_EMMC_CMD_DAT 0x58
> +#define SD_EMMC_CMD_RSP 0x5c
> +#define SD_EMMC_CMD_RSP1 0x60
> +#define SD_EMMC_CMD_RSP2 0x64
> +#define SD_EMMC_CMD_RSP3 0x68
> +
> +#define SD_EMMC_RXD 0x94
> +#define SD_EMMC_TXD 0x94
> +#define SD_EMMC_LAST_REG SD_EMMC_TXD
> +
> +#define SD_EMMC_CFG_BLK_SIZE 512 /* internal buffer max: 512 bytes */
> +#define SD_EMMC_CFG_RESP_TIMEOUT 256 /* in clock cycles */
> +#define SD_EMMC_CFG_CMD_GAP 16 /* in clock cycles */
> +#define MUX_CLK_NUM_PARENTS 2
> +
> +struct meson_host {
> +       struct  device          *dev;
> +       struct  mmc_host        *mmc;
> +       struct  mmc_request     *mrq;
> +       struct  mmc_command     *cmd;
> +
> +       spinlock_t lock;
> +       void __iomem *regs;
> +       int irq;
> +       u32 ocr_mask;
> +       struct clk *core_clk;
> +       struct clk_mux mux;
> +       struct clk *mux_clk;
> +       struct clk *mux_parent[MUX_CLK_NUM_PARENTS];
> +       unsigned long mux_parent_rate[MUX_CLK_NUM_PARENTS];
> +
> +       struct clk_divider cfg_div;
> +       struct clk *cfg_div_clk;
> +
> +       unsigned int bounce_buf_size;
> +       void *bounce_buf;
> +       dma_addr_t bounce_dma_addr;
> +
> +       bool vqmmc_enabled;
> +};
> +
> +struct sd_emmc_desc {
> +       u32 cmd_cfg;
> +       u32 cmd_arg;
> +       u32 cmd_data;
> +       u32 cmd_resp;
> +};
> +#define CMD_CFG_LENGTH_SHIFT 0
> +#define CMD_CFG_LENGTH_MASK 0x1ff
> +#define CMD_CFG_BLOCK_MODE BIT(9)
> +#define CMD_CFG_R1B BIT(10)
> +#define CMD_CFG_END_OF_CHAIN BIT(11)
> +#define CMD_CFG_TIMEOUT_SHIFT 12
> +#define CMD_CFG_TIMEOUT_MASK 0xf
> +#define CMD_CFG_NO_RESP BIT(16)
> +#define CMD_CFG_NO_CMD BIT(17)
> +#define CMD_CFG_DATA_IO BIT(18)
> +#define CMD_CFG_DATA_WR BIT(19)
> +#define CMD_CFG_RESP_NOCRC BIT(20)
> +#define CMD_CFG_RESP_128 BIT(21)
> +#define CMD_CFG_RESP_NUM BIT(22)
> +#define CMD_CFG_DATA_NUM BIT(23)
> +#define CMD_CFG_CMD_INDEX_SHIFT 24
> +#define CMD_CFG_CMD_INDEX_MASK 0x3f
> +#define CMD_CFG_ERROR BIT(30)
> +#define CMD_CFG_OWNER BIT(31)
> +
> +#define CMD_DATA_MASK (~0x3)
> +#define CMD_DATA_BIG_ENDIAN BIT(1)
> +#define CMD_DATA_SRAM BIT(0)
> +#define CMD_RESP_MASK (~0x1)
> +#define CMD_RESP_SRAM BIT(0)
> +
> +static int meson_mmc_clk_set(struct meson_host *host, unsigned long clk_rate)
> +{
> +       struct mmc_host *mmc = host->mmc;
> +       int ret = 0;
> +       u32 cfg;
> +
> +       if (clk_rate) {
> +               if (WARN_ON(clk_rate > mmc->f_max))
> +                       clk_rate = mmc->f_max;
> +               else if (WARN_ON(clk_rate < mmc->f_min))
> +                       clk_rate = mmc->f_min;
> +       }
> +
> +       if (clk_rate == mmc->actual_clock)
> +               return 0;
> +
> +       /* stop clock */
> +       cfg = readl(host->regs + SD_EMMC_CFG);
> +       if (!(cfg & CFG_STOP_CLOCK)) {
> +               cfg |= CFG_STOP_CLOCK;
> +               writel(cfg, host->regs + SD_EMMC_CFG);
> +       }
> +
> +       dev_dbg(host->dev, "change clock rate %u -> %lu\n",
> +               mmc->actual_clock, clk_rate);
> +
> +       if (clk_rate == 0) {
> +               mmc->actual_clock = 0;
> +               return 0;
> +       }
> +
> +       ret = clk_set_rate(host->cfg_div_clk, clk_rate);
> +       if (ret)
> +               dev_warn(host->dev, "Unable to set cfg_div_clk to %lu. ret=%d\n",
> +                        clk_rate, ret);
> +       else if (clk_rate && clk_rate != clk_get_rate(host->cfg_div_clk))
> +               dev_warn(host->dev, "divider requested rate %lu != actual rate %lu: ret=%d\n",
> +                        clk_rate, clk_get_rate(host->cfg_div_clk), ret);
> +       else
> +               mmc->actual_clock = clk_rate;
> +
> +       /* (re)start clock, if non-zero */
> +       if (!ret && clk_rate) {
> +               cfg = readl(host->regs + SD_EMMC_CFG);
> +               cfg &= ~CFG_STOP_CLOCK;
> +               writel(cfg, host->regs + SD_EMMC_CFG);
> +       }
> +
> +       return ret;
> +}
> +
> +/*
> + * The SD/eMMC IP block has an internal mux and divider used for
> + * generating the MMC clock.  Use the clock framework to create and
> + * manage these clocks.
> + */
> +static int meson_mmc_clk_init(struct meson_host *host)
> +{
> +       struct clk_init_data init;
> +       char clk_name[32];
> +       int i, ret = 0;
> +       const char *mux_parent_names[MUX_CLK_NUM_PARENTS];
> +       unsigned int mux_parent_count = 0;
> +       const char *clk_div_parents[1];
> +       unsigned int f_min = UINT_MAX;
> +       u32 clk_reg, cfg;
> +
> +       /* get the mux parents */
> +       for (i = 0; i < MUX_CLK_NUM_PARENTS; i++) {
> +               char name[16];
> +
> +               snprintf(name, sizeof(name), "clkin%d", i);
> +               host->mux_parent[i] = devm_clk_get(host->dev, name);
> +               if (IS_ERR(host->mux_parent[i])) {
> +                       ret = PTR_ERR(host->mux_parent[i]);
> +                       if (PTR_ERR(host->mux_parent[i]) != -EPROBE_DEFER)
> +                               dev_err(host->dev, "Missing clock %s\n", name);
> +                       host->mux_parent[i] = NULL;
> +                       return ret;
> +               }
> +
> +               host->mux_parent_rate[i] = clk_get_rate(host->mux_parent[i]);
> +               mux_parent_names[i] = __clk_get_name(host->mux_parent[i]);
> +               mux_parent_count++;
> +               if (host->mux_parent_rate[i] < f_min)
> +                       f_min = host->mux_parent_rate[i];
> +       }
> +
> +       /* cacluate f_min based on input clocks, and max divider value */
> +       if (f_min != UINT_MAX)
> +               f_min = DIV_ROUND_UP(CLK_SRC_XTAL_RATE, CLK_DIV_MAX);
> +       else
> +               f_min = 4000000;  /* default min: 400 MHz */
> +       host->mmc->f_min = f_min;
> +
> +       /* create the mux */
> +       snprintf(clk_name, sizeof(clk_name), "%s#mux", dev_name(host->dev));
> +       init.name = clk_name;
> +       init.ops = &clk_mux_ops;
> +       init.flags = 0;
> +       init.parent_names = mux_parent_names;
> +       init.num_parents = mux_parent_count;
> +
> +       host->mux.reg = host->regs + SD_EMMC_CLOCK;
> +       host->mux.shift = CLK_SRC_SHIFT;
> +       host->mux.mask = CLK_SRC_MASK;
> +       host->mux.flags = 0;
> +       host->mux.table = NULL;
> +       host->mux.hw.init = &init;
> +
> +       host->mux_clk = devm_clk_register(host->dev, &host->mux.hw);
> +       if (WARN_ON(IS_ERR(host->mux_clk)))
> +               return PTR_ERR(host->mux_clk);
> +
> +       /* create the divider */
> +       snprintf(clk_name, sizeof(clk_name), "%s#div", dev_name(host->dev));
> +       init.name = devm_kstrdup(host->dev, clk_name, GFP_KERNEL);
> +       init.ops = &clk_divider_ops;
> +       init.flags = CLK_SET_RATE_PARENT;
> +       clk_div_parents[0] = __clk_get_name(host->mux_clk);
> +       init.parent_names = clk_div_parents;
> +       init.num_parents = ARRAY_SIZE(clk_div_parents);
> +
> +       host->cfg_div.reg = host->regs + SD_EMMC_CLOCK;
> +       host->cfg_div.shift = CLK_DIV_SHIFT;
> +       host->cfg_div.width = CLK_DIV_WIDTH;
> +       host->cfg_div.hw.init = &init;
> +       host->cfg_div.flags = CLK_DIVIDER_ONE_BASED |
> +               CLK_DIVIDER_ROUND_CLOSEST | CLK_DIVIDER_ALLOW_ZERO;
> +
> +       host->cfg_div_clk = devm_clk_register(host->dev, &host->cfg_div.hw);
> +       if (WARN_ON(PTR_ERR_OR_ZERO(host->cfg_div_clk)))
> +               return PTR_ERR(host->cfg_div_clk);
> +
> +       /* init SD_EMMC_CLOCK to sane defaults w/min clock rate */
> +       clk_reg = 0;
> +       clk_reg |= CLK_PHASE_180 << CLK_PHASE_SHIFT;
> +       clk_reg |= CLK_SRC_XTAL << CLK_SRC_SHIFT;
> +       clk_reg |= CLK_DIV_MAX << CLK_DIV_SHIFT;
> +       clk_reg &= ~CLK_ALWAYS_ON;
> +       writel(clk_reg, host->regs + SD_EMMC_CLOCK);
> +
> +       /* Ensure clock starts in "auto" mode, not "always on" */
> +       cfg = readl(host->regs + SD_EMMC_CFG);
> +       cfg &= ~CFG_CLK_ALWAYS_ON;
> +       cfg |= CFG_AUTO_CLK;
> +       writel(cfg, host->regs + SD_EMMC_CFG);
> +
> +       ret = clk_prepare_enable(host->cfg_div_clk);
> +       if (!ret)
> +               ret = meson_mmc_clk_set(host, f_min);
> +
> +       if (!ret)
> +               clk_disable_unprepare(host->cfg_div_clk);
> +
> +       return ret;
> +}
> +
> +static void meson_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
> +{
> +       struct meson_host *host = mmc_priv(mmc);
> +       u32 bus_width;
> +       u32 val, orig;
> +
> +       /*
> +        * GPIO regulator, only controls switching between 1v8 and
> +        * 3v3, doesn't support MMC_POWER_OFF, MMC_POWER_ON.
> +        */
> +       switch (ios->power_mode) {
> +       case MMC_POWER_OFF:
> +               if (!IS_ERR(mmc->supply.vmmc))
> +                       mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0);
> +
> +               if (!IS_ERR(mmc->supply.vqmmc) && host->vqmmc_enabled) {
> +                       regulator_disable(mmc->supply.vqmmc);
> +                       host->vqmmc_enabled = false;
> +               }
> +
> +               break;
> +
> +       case MMC_POWER_UP:
> +               if (!IS_ERR(mmc->supply.vmmc))
> +                       mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, ios->vdd);
> +               break;
> +
> +       case MMC_POWER_ON:
> +               if (!IS_ERR(mmc->supply.vqmmc) && !host->vqmmc_enabled) {
> +                       int ret = regulator_enable(mmc->supply.vqmmc);
> +
> +                       if (ret < 0)
> +                               dev_err(mmc_dev(mmc),
> +                                       "failed to enable vqmmc regulator\n");
> +                       else
> +                               host->vqmmc_enabled = true;
> +               }
> +
> +               break;
> +       }
> +
> +
> +       meson_mmc_clk_set(host, ios->clock);
> +
> +       /* Bus width */
> +       val = readl(host->regs + SD_EMMC_CFG);
> +       switch (ios->bus_width) {
> +       case MMC_BUS_WIDTH_1:
> +               bus_width = CFG_BUS_WIDTH_1;
> +               break;
> +       case MMC_BUS_WIDTH_4:
> +               bus_width = CFG_BUS_WIDTH_4;
> +               break;
> +       case MMC_BUS_WIDTH_8:
> +               bus_width = CFG_BUS_WIDTH_8;
> +               break;
> +       default:
> +               dev_err(host->dev, "Invalid ios->bus_width: %u.  Setting to 4.\n",
> +                       ios->bus_width);
> +               bus_width = CFG_BUS_WIDTH_4;
> +               return;
> +       }
> +
> +       val = readl(host->regs + SD_EMMC_CFG);
> +       orig = val;
> +
> +       val &= ~(CFG_BUS_WIDTH_MASK << CFG_BUS_WIDTH_SHIFT);
> +       val |= bus_width << CFG_BUS_WIDTH_SHIFT;
> +
> +       val &= ~(CFG_BLK_LEN_MASK << CFG_BLK_LEN_SHIFT);
> +       val |= ilog2(SD_EMMC_CFG_BLK_SIZE) << CFG_BLK_LEN_SHIFT;
> +
> +       val &= ~(CFG_RESP_TIMEOUT_MASK << CFG_RESP_TIMEOUT_SHIFT);
> +       val |= ilog2(SD_EMMC_CFG_RESP_TIMEOUT) << CFG_RESP_TIMEOUT_SHIFT;
> +
> +       val &= ~(CFG_RC_CC_MASK << CFG_RC_CC_SHIFT);
> +       val |= ilog2(SD_EMMC_CFG_CMD_GAP) << CFG_RC_CC_SHIFT;
> +
> +       writel(val, host->regs + SD_EMMC_CFG);
> +
> +       if (val != orig)
> +               dev_dbg(host->dev, "%s: SD_EMMC_CFG: 0x%08x -> 0x%08x\n",
> +                       __func__, orig, val);
> +}
> +
> +static int meson_mmc_request_done(struct mmc_host *mmc, struct mmc_request *mrq)
> +{
> +       struct meson_host *host = mmc_priv(mmc);
> +
> +       WARN_ON(host->mrq != mrq);
> +
> +       host->mrq = NULL;
> +       host->cmd = NULL;
> +       mmc_request_done(host->mmc, mrq);
> +
> +       return 0;
> +}
> +
> +static void meson_mmc_start_cmd(struct mmc_host *mmc, struct mmc_command *cmd)
> +{
> +       struct meson_host *host = mmc_priv(mmc);
> +       struct sd_emmc_desc *desc, desc_tmp;
> +       u32 cfg;
> +       u8 blk_len, cmd_cfg_timeout;
> +       unsigned int xfer_bytes = 0;
> +
> +       /* Setup descriptors */
> +       dma_rmb();
> +       desc = &desc_tmp;
> +       memset(desc, 0, sizeof(struct sd_emmc_desc));
> +
> +       desc->cmd_cfg |= (cmd->opcode & CMD_CFG_CMD_INDEX_MASK) <<
> +               CMD_CFG_CMD_INDEX_SHIFT;
> +       desc->cmd_cfg |= CMD_CFG_OWNER;  /* owned by CPU */
> +       desc->cmd_arg = cmd->arg;
> +
> +       /* Response */
> +       if (cmd->flags & MMC_RSP_PRESENT) {
> +               desc->cmd_cfg &= ~CMD_CFG_NO_RESP;
> +               if (cmd->flags & MMC_RSP_136)
> +                       desc->cmd_cfg |= CMD_CFG_RESP_128;
> +               desc->cmd_cfg |= CMD_CFG_RESP_NUM;
> +               desc->cmd_resp = 0;
> +
> +               if (!(cmd->flags & MMC_RSP_CRC))
> +                       desc->cmd_cfg |= CMD_CFG_RESP_NOCRC;
> +
> +               if (cmd->flags & MMC_RSP_BUSY)
> +                       desc->cmd_cfg |= CMD_CFG_R1B;
> +       } else {
> +               desc->cmd_cfg |= CMD_CFG_NO_RESP;
> +       }
> +
> +       /* data? */
> +       if (cmd->data) {
> +               desc->cmd_cfg |= CMD_CFG_DATA_IO;
> +               if (cmd->data->blocks > 1) {
> +                       desc->cmd_cfg |= CMD_CFG_BLOCK_MODE;
> +                       desc->cmd_cfg |=
> +                               (cmd->data->blocks & CMD_CFG_LENGTH_MASK) <<
> +                               CMD_CFG_LENGTH_SHIFT;
> +
> +                       /* check if block-size matches, if not update */
> +                       cfg = readl(host->regs + SD_EMMC_CFG);
> +                       blk_len = cfg & (CFG_BLK_LEN_MASK << CFG_BLK_LEN_SHIFT);
> +                       blk_len >>= CFG_BLK_LEN_SHIFT;
> +                       if (blk_len != ilog2(cmd->data->blksz)) {
> +                               dev_warn(host->dev, "%s: update blk_len %d -> %d\n",
> +                                       __func__, blk_len,
> +                                        ilog2(cmd->data->blksz));
> +                               blk_len = ilog2(cmd->data->blksz);
> +                               cfg &= ~(CFG_BLK_LEN_MASK << CFG_BLK_LEN_SHIFT);
> +                               cfg |= blk_len << CFG_BLK_LEN_SHIFT;
> +                               writel(cfg, host->regs + SD_EMMC_CFG);
> +                       }
> +               } else {
> +                       desc->cmd_cfg &= ~CMD_CFG_BLOCK_MODE;
> +                       desc->cmd_cfg |=
> +                               (cmd->data->blksz & CMD_CFG_LENGTH_MASK) <<
> +                               CMD_CFG_LENGTH_SHIFT;
> +               }
> +
> +               cmd->data->bytes_xfered = 0;
> +               xfer_bytes = cmd->data->blksz * cmd->data->blocks;
> +               if (cmd->data->flags & MMC_DATA_WRITE) {
> +                       desc->cmd_cfg |= CMD_CFG_DATA_WR;
> +                       WARN_ON(xfer_bytes > host->bounce_buf_size);
> +                       sg_copy_to_buffer(cmd->data->sg, cmd->data->sg_len,
> +                                         host->bounce_buf, xfer_bytes);
> +                       cmd->data->bytes_xfered = xfer_bytes;
> +                       dma_wmb();
> +               } else {
> +                       desc->cmd_cfg &= ~CMD_CFG_DATA_WR;
> +               }
> +
> +               if (xfer_bytes > 0) {
> +                       desc->cmd_cfg &= ~CMD_CFG_DATA_NUM;
> +                       desc->cmd_data = host->bounce_dma_addr & CMD_DATA_MASK;
> +               } else {
> +                       /* write data to data_addr */
> +                       desc->cmd_cfg |= CMD_CFG_DATA_NUM;
> +                       desc->cmd_data = 0;
> +               }
> +
> +               cmd_cfg_timeout = 12;
> +       } else {
> +               desc->cmd_cfg &= ~CMD_CFG_DATA_IO;
> +               cmd_cfg_timeout = 10;
> +       }
> +       desc->cmd_cfg |= (cmd_cfg_timeout & CMD_CFG_TIMEOUT_MASK) <<
> +               CMD_CFG_TIMEOUT_SHIFT;
> +
> +       host->cmd = cmd;
> +
> +       /* Last descriptor */
> +       desc->cmd_cfg |= CMD_CFG_END_OF_CHAIN;
> +       writel(desc->cmd_cfg, host->regs + SD_EMMC_CMD_CFG);
> +       writel(desc->cmd_data, host->regs + SD_EMMC_CMD_DAT);
> +       writel(desc->cmd_resp, host->regs + SD_EMMC_CMD_RSP);
> +       wmb(); /* ensure descriptor is written before kicked */
> +       writel(desc->cmd_arg, host->regs + SD_EMMC_CMD_ARG);
> +}
> +
> +static void meson_mmc_request(struct mmc_host *mmc, struct mmc_request *mrq)
> +{
> +       struct meson_host *host = mmc_priv(mmc);
> +
> +       WARN_ON(host->mrq != NULL);
> +
> +       /* Stop execution */
> +       writel(0, host->regs + SD_EMMC_START);
> +
> +       /* clear, ack, enable all interrupts */
> +       writel(0, host->regs + SD_EMMC_IRQ_EN);
> +       writel(IRQ_EN_MASK, host->regs + SD_EMMC_STATUS);
> +       writel(IRQ_EN_MASK, host->regs + SD_EMMC_IRQ_EN);
> +
> +       host->mrq = mrq;
> +
> +       if (mrq->sbc)
> +               meson_mmc_start_cmd(mmc, mrq->sbc);
> +       else
> +               meson_mmc_start_cmd(mmc, mrq->cmd);
> +}
> +
> +static int meson_mmc_read_resp(struct mmc_host *mmc, struct mmc_command *cmd)
> +{
> +       struct meson_host *host = mmc_priv(mmc);
> +
> +       if (cmd->flags & MMC_RSP_136) {
> +               cmd->resp[0] = readl(host->regs + SD_EMMC_CMD_RSP3);
> +               cmd->resp[1] = readl(host->regs + SD_EMMC_CMD_RSP2);
> +               cmd->resp[2] = readl(host->regs + SD_EMMC_CMD_RSP1);
> +               cmd->resp[3] = readl(host->regs + SD_EMMC_CMD_RSP);
> +       } else if (cmd->flags & MMC_RSP_PRESENT) {
> +               cmd->resp[0] = readl(host->regs + SD_EMMC_CMD_RSP);
> +       }
> +
> +       return 0;
> +}
> +
> +static irqreturn_t meson_mmc_irq(int irq, void *dev_id)
> +{
> +       struct meson_host *host = dev_id;
> +       struct mmc_request *mrq;
> +       struct mmc_command *cmd = host->cmd;
> +       u32 irq_en, status, raw_status;
> +       irqreturn_t ret = IRQ_HANDLED;
> +
> +       if (WARN_ON(!host))
> +               return IRQ_NONE;
> +
> +       mrq = host->mrq;
> +
> +       if (WARN_ON(!mrq))
> +               return IRQ_NONE;
> +
> +       if (WARN_ON(!cmd))
> +               return IRQ_NONE;
> +
> +       spin_lock(&host->lock);
> +       irq_en = readl(host->regs + SD_EMMC_IRQ_EN);
> +       raw_status = readl(host->regs + SD_EMMC_STATUS);
> +       status = raw_status & irq_en;
> +
> +       if (!status) {
> +               dev_warn(host->dev, "Spurious IRQ! status=0x%08x, irq_en=0x%08x\n",
> +                        raw_status, irq_en);
> +               ret = IRQ_NONE;
> +               goto out;
> +       }
> +
> +       cmd->error = 0;
> +       if (status & IRQ_RXD_ERR_MASK) {
> +               dev_dbg(host->dev, "Unhandled IRQ: RXD error\n");
> +               cmd->error = -EILSEQ;
> +       }
> +       if (status & IRQ_TXD_ERR) {
> +               dev_dbg(host->dev, "Unhandled IRQ: TXD error\n");
> +               cmd->error = -EILSEQ;
> +       }
> +       if (status & IRQ_DESC_ERR)
> +               dev_dbg(host->dev, "Unhandled IRQ: Descriptor error\n");
> +       if (status & IRQ_RESP_ERR) {
> +               dev_dbg(host->dev, "Unhandled IRQ: Response error\n");
> +               cmd->error = -EILSEQ;
> +       }
> +       if (status & IRQ_RESP_TIMEOUT) {
> +               dev_dbg(host->dev, "Unhandled IRQ: Response timeout\n");
> +               cmd->error = -ETIMEDOUT;
> +       }
> +       if (status & IRQ_DESC_TIMEOUT) {
> +               dev_dbg(host->dev, "Unhandled IRQ: Descriptor timeout\n");
> +               cmd->error = -ETIMEDOUT;
> +       }
> +       if (status & IRQ_SDIO)
> +               dev_dbg(host->dev, "Unhandled IRQ: SDIO.\n");
> +
> +       if (status & (IRQ_END_OF_CHAIN | IRQ_RESP_STATUS))
> +               ret = IRQ_WAKE_THREAD;
> +       else  {
> +               dev_warn(host->dev, "Unknown IRQ! status=0x%04x: MMC CMD%u arg=0x%08x flags=0x%08x stop=%d\n",
> +                        status, cmd->opcode, cmd->arg,
> +                        cmd->flags, mrq->stop ? 1 : 0);
> +               if (cmd->data) {
> +                       struct mmc_data *data = cmd->data;
> +
> +                       dev_warn(host->dev, "\tblksz %u blocks %u flags 0x%08x (%s%s)",
> +                                data->blksz, data->blocks, data->flags,
> +                                data->flags & MMC_DATA_WRITE ? "write" : "",
> +                                data->flags & MMC_DATA_READ ? "read" : "");
> +               }
> +       }
> +
> +out:
> +       /* ack all (enabled) interrupts */
> +       writel(status, host->regs + SD_EMMC_STATUS);
> +
> +       if (ret == IRQ_HANDLED) {
> +               meson_mmc_read_resp(host->mmc, cmd);
> +               meson_mmc_request_done(host->mmc, cmd->mrq);
> +       }
> +
> +       spin_unlock(&host->lock);
> +       return ret;
> +}
> +
> +static irqreturn_t meson_mmc_irq_thread(int irq, void *dev_id)
> +{
> +       struct meson_host *host = dev_id;
> +       struct mmc_request *mrq = host->mrq;
> +       struct mmc_command *cmd = host->cmd;
> +       struct mmc_data *data;
> +       unsigned int xfer_bytes;
> +       int ret = IRQ_HANDLED;
> +
> +       if (WARN_ON(!mrq))
> +               ret = IRQ_NONE;
> +
> +       if (WARN_ON(!cmd))
> +               ret = IRQ_NONE;
> +
> +       data = cmd->data;
> +       if (data) {
> +               xfer_bytes = data->blksz * data->blocks;
> +               if (data->flags & MMC_DATA_READ) {
> +                       WARN_ON(xfer_bytes > host->bounce_buf_size);
> +                       sg_copy_from_buffer(data->sg, data->sg_len,
> +                                           host->bounce_buf, xfer_bytes);
> +                       data->bytes_xfered = xfer_bytes;
> +               }
> +       }
> +
> +       meson_mmc_read_resp(host->mmc, cmd);
> +       if (!data || !data->stop || mrq->sbc)
> +               meson_mmc_request_done(host->mmc, mrq);
> +       else
> +               meson_mmc_start_cmd(host->mmc, data->stop);
> +
> +       return ret;
> +}
> +
> +/*
> + * NOTE: we only need this until the GPIO/pinctrl driver can handle
> + * interrupts.  For now, the MMC core will use this for polling.
> + */
> +static int meson_mmc_get_cd(struct mmc_host *mmc)
> +{
> +       int status = mmc_gpio_get_cd(mmc);
> +
> +       if (status == -ENOSYS)
> +               return 1; /* assume present */
> +
> +       return status;
> +}
> +
> +static const struct mmc_host_ops meson_mmc_ops = {
> +       .request        = meson_mmc_request,
> +       .set_ios        = meson_mmc_set_ios,
> +       .get_cd         = meson_mmc_get_cd,
> +};
> +
> +static int meson_mmc_probe(struct platform_device *pdev)
> +{
> +       struct resource *res;
> +       struct meson_host *host;
> +       struct mmc_host *mmc;
> +       int ret;
> +
> +       mmc = mmc_alloc_host(sizeof(struct meson_host), &pdev->dev);
> +       if (!mmc)
> +               return -ENOMEM;
> +       host = mmc_priv(mmc);
> +       host->mmc = mmc;
> +       host->dev = &pdev->dev;
> +       dev_set_drvdata(&pdev->dev, host);
> +
> +       spin_lock_init(&host->lock);
> +
> +       /* Get regulators and the supported OCR mask */
> +       host->vqmmc_enabled = false;
> +       ret = mmc_regulator_get_supply(mmc);
> +       if (ret == -EPROBE_DEFER)
> +               goto free_host;
> +
> +       ret = mmc_of_parse(mmc);
> +       if (ret) {
> +               dev_warn(&pdev->dev, "error parsing DT: %d\n", ret);
> +               goto free_host;
> +       }
> +
> +       res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +       host->regs = devm_ioremap_resource(&pdev->dev, res);
> +       if (IS_ERR(host->regs)) {
> +               ret = PTR_ERR(host->regs);
> +               goto free_host;
> +       }
> +
> +       host->irq = platform_get_irq(pdev, 0);
> +       if (host->irq == 0) {
> +               dev_err(&pdev->dev, "failed to get interrupt resource.\n");
> +               ret = -EINVAL;
> +               goto free_host;
> +       }
> +
> +       host->core_clk = devm_clk_get(&pdev->dev, "core");
> +       if (IS_ERR(host->core_clk)) {
> +               ret = PTR_ERR(host->core_clk);
> +               goto free_host;
> +       }
> +
> +       ret = clk_prepare_enable(host->core_clk);
> +       if (ret)
> +               goto free_host;
> +
> +       ret = meson_mmc_clk_init(host);
> +       if (ret)
> +               goto free_host;
> +
> +       /* Stop execution */
> +       writel(0, host->regs + SD_EMMC_START);
> +
> +       /* clear, ack, enable all interrupts */
> +       writel(0, host->regs + SD_EMMC_IRQ_EN);
> +       writel(IRQ_EN_MASK, host->regs + SD_EMMC_STATUS);
> +
> +       ret = devm_request_threaded_irq(&pdev->dev, host->irq,
> +                                       meson_mmc_irq, meson_mmc_irq_thread,
> +                                       IRQF_SHARED, DRIVER_NAME, host);
> +       if (ret)
> +               goto free_host;
> +
> +       /* data bounce buffer */
> +       host->bounce_buf_size = SZ_512K;
> +       host->bounce_buf =
> +               dma_alloc_coherent(host->dev, host->bounce_buf_size,
> +                                  &host->bounce_dma_addr, GFP_KERNEL);
> +       if (host->bounce_buf == NULL) {
> +               dev_err(host->dev, "Unable to map allocate DMA bounce buffer.\n");
> +               ret = -ENOMEM;
> +               goto free_host;
> +       }
> +
> +       mmc->ops = &meson_mmc_ops;
> +       mmc_add_host(mmc);
> +
> +       return 0;
> +
> +free_host:
> +       clk_disable_unprepare(host->cfg_div_clk);
> +       clk_disable_unprepare(host->core_clk);
> +       mmc_free_host(mmc);
> +       return ret;
> +}
> +
> +static int meson_mmc_remove(struct platform_device *pdev)
> +{
> +       struct meson_host *host = dev_get_drvdata(&pdev->dev);
> +
> +       if (WARN_ON(!host))
> +               return 0;
> +
> +       if (host->bounce_buf)
> +               dma_free_coherent(host->dev, host->bounce_buf_size,
> +                                 host->bounce_buf, host->bounce_dma_addr);
> +
> +       clk_disable_unprepare(host->cfg_div_clk);
> +       clk_disable_unprepare(host->core_clk);
> +
> +       mmc_free_host(host->mmc);
> +       return 0;
> +}
> +
> +static const struct of_device_id meson_mmc_of_match[] = {
> +       { .compatible = "amlogic,meson-gx-mmc", },
> +       { .compatible = "amlogic,meson-gxbb-mmc", },
> +       { .compatible = "amlogic,meson-gxl-mmc", },
> +       { .compatible = "amlogic,meson-gxm-mmc", },
> +       {}
> +};
> +MODULE_DEVICE_TABLE(of, meson_mmc_of_match);
> +
> +static struct platform_driver meson_mmc_driver = {
> +       .probe          = meson_mmc_probe,
> +       .remove         = meson_mmc_remove,
> +       .driver         = {
> +               .name = DRIVER_NAME,
> +               .of_match_table = of_match_ptr(meson_mmc_of_match),
> +       },
> +};
> +
> +module_platform_driver(meson_mmc_driver);
> +
> +MODULE_ALIAS("platform:" DRIVER_NAME);
> +MODULE_DESCRIPTION("Amlogic S905/GXBB SD/eMMC driver");
> +MODULE_AUTHOR("Kevin Hilman <khilman@xxxxxxxxxxxx>");
> +MODULE_LICENSE("GPL v2");
> +
> --
> 2.9.3
>
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