Dear Ulf Hansson:
> Subject: Re: [PATCH v2 2/2] mmc: Add mmc driver for Sunplus SP7021
>
> + Li-hau Kuo,
>
> On Wed, 5 Jan 2022 at 06:20, Tony Huang <tonyhuang.sunplus@xxxxxxxxx>
> wrote:
> >
> > Add mmc driver for Sunplus SP7021
> >
> > Signed-off-by: Tony Huang <tonyhuang.sunplus@xxxxxxxxx>
>
> There is another driver that has been posted for the eMMC/SD/SDIO
> controller for Sunplus SP7021 [1]. Without going into the details it
> looks like it's a very similar IP block - or at least it's just a
> slightly different version of it.
>
> Rather than using one separate driver per version of the IP block, I
> strongly suggest that we combine the drivers into one driver.
>
> I fully understand that we need to distinguish the variants in the
> driver, which should be done by using one compatible string per
> variant of the IP block. Moreover, we have existing common mmc DT
> bindings, thus allowing the block to be used for one of SD, SDIO or
> eMMC ("no-sd", "no-sdio" and "no-mmc"), which seem like it can be
> useful for this case.
>
We will follow your suggestion. SD/SDIO/eMMC combined into on driver.
> That said, before I start reviewing this, perhaps $subject patch is
> still a good starting point, then we can add support for the SD/SDIO
> part/variant on top to the same driver. Would that make sense or do
> you prefer another path forward?
>
> Kind regards
> Uffe
>
> [1]
> https://patchwork.kernel.org/project/linux-mmc/list/?series=601160
>
> > ---
> > Changes in v2:
> > - Remove unused code.
> > - Modify read/write register address.
> >
> > MAINTAINERS | 1 +
> > drivers/mmc/host/sunplus_mmc.c | 1204
> ++++++++++++++++++++++++++++++++++++++++
> > 2 files changed, 1205 insertions(+)
> > create mode 100644 drivers/mmc/host/sunplus_mmc.c
> >
> > diff --git a/MAINTAINERS b/MAINTAINERS
> > index 01ed57a..bf8c066 100644
> > --- a/MAINTAINERS
> > +++ b/MAINTAINERS
> > @@ -18246,6 +18246,7 @@ SUNPLUS MMC DRIVER
> > M: Tony Huang <tonyhuang.sunplus@xxxxxxxxx>
> > S: Maintained
> > F: Documentation/devicetree/bindings/mmcc/sunplu-mmc.yaml
> > +F: drivers/mmc/host/sunplus_mmc.c
> >
> > SUPERH
> > M: Yoshinori Sato <ysato@xxxxxxxxxxxxxxxxxxxx>
> > diff --git a/drivers/mmc/host/sunplus_mmc.c
> b/drivers/mmc/host/sunplus_mmc.c
> > new file mode 100644
> > index 0000000..78716cf
> > --- /dev/null
> > +++ b/drivers/mmc/host/sunplus_mmc.c
> > @@ -0,0 +1,1204 @@
> > +// SPDX-License-Identifier: GPL-2.0-only
> > +/*
> > + * Copyright (c) Sunplus Inc.
> > + * Author: Tony Huang <tonyhuang.sunplus@xxxxxxxxx>
> > + */
> > +
> > +#include <linux/bitops.h>
> > +#include <linux/clk.h>
> > +#include <linux/delay.h>
> > +#include <linux/dma-mapping.h>
> > +#include <linux/interrupt.h>
> > +#include <linux/mmc/core.h>
> > +#include <linux/mmc/host.h>
> > +#include <linux/mmc/mmc.h>
> > +#include <linux/mmc/slot-gpio.h>
> > +#include <linux/module.h>
> > +#include <linux/of.h>
> > +#include <linux/of_device.h>
> > +#include <linux/platform_device.h>
> > +#include <linux/pm_runtime.h>
> > +#include <linux/reset.h>
> > +
> > +#define SPMMC_MIN_CLK 400000
> > +#define SPMMC_MAX_CLK 52000000
> > +#define SPMMC_MAX_BLK_COUNT 65536
> > +#define SPMMC_MAX_TUNABLE_DLY 7
> > +
> > +#define SPMMC_CARD_MEDIATYPE_SRCDST_REG 0x0000
> > +#define SPMMC_MEDIA_NONE 0
> > +#define SPMMC_MEDIA_SD 6
> > +#define SPMMC_MEDIA_MS 7
> > +
> > +#define SPMMC_SDRAM_SECTOR_0_SIZE_REG 0x0008
> > +#define SPMMC_DMA_BASE_ADDR_REG
> 0x000C
> > +#define SPMMC_HW_DMA_CTRL_REG 0x0010
> > +#define SPMMC_MAX_DMA_MEMORY_SECTORS 8
> > +
> > +#define SPMMC_SDRAM_SECTOR_1_ADDR_REG 0x0018
> > +
> > +#define SPMMC_SD_INT_REG 0x0088
> > +#define SPMMC_SDINT_SDCMPEN BIT(0)
> > +#define SPMMC_SDINT_SDCMP BIT(1)
> > +#define SPMMC_SDINT_SDIOEN BIT(3)
> > +#define SPMMC_SDINT_SDIO BIT(4)
> > +
> > +#define SPMMC_SD_PAGE_NUM_REG 0x008C
> > +#define SPMMC_SD_CONFIG0_REG 0x0090
> > +#define SPMMC_MODE_SD 0
> > +#define SPMMC_MODE_EMMC 1
> > +#define SPMMC_MODE_SDIO 2
> > +
> > +#define SPMMC_SDIO_CTRL_REG 0x0094
> > +#define SPMMC_SD_RST_REG 0x0098
> > +#define SPMMC_SD_CTRL_REG 0x009C
> > +
> > +#define SPMMC_SD_STATUS_REG
> 0x00A0
> > +#define SPMMC_SDSTATUS_DUMMY_READY
> BIT(0)
> > +#define SPMMC_SDSTATUS_RSP_BUF_FULL
> BIT(1)
> > +#define SPMMC_SDSTATUS_TX_DATA_BUF_EMPTY BIT(2)
> > +#define SPMMC_SDSTATUS_RX_DATA_BUF_FULL
> BIT(3)
> > +#define SPMMC_SDSTATUS_CMD_PIN_STATUS BIT(4)
> > +#define SPMMC_SDSTATUS_DAT0_PIN_STATUS BIT(5)
> > +#define SPMMC_SDSTATUS_RSP_TIMEOUT
> BIT(6)
> > +#define SPMMC_SDSTATUS_CARD_CRC_CHECK_TIMEOUT BIT(7)
> > +#define SPMMC_SDSTATUS_STB_TIMEOUT
> BIT(8)
> > +#define SPMMC_SDSTATUS_RSP_CRC7_ERROR BIT(9)
> > +#define SPMMC_SDSTATUS_CRC_TOKEN_CHECK_ERROR BIT(10)
> > +#define SPMMC_SDSTATUS_RDATA_CRC16_ERROR
> BIT(11)
> > +#define SPMMC_SDSTATUS_SUSPEND_STATE_READY
> BIT(12)
> > +#define SPMMC_SDSTATUS_BUSY_CYCLE
> BIT(13)
> > +#define SPMMC_SDSTATUS_DAT1_PIN_STATUS BIT(14)
> > +#define SPMMC_SDSTATUS_SD_SENSE_STATUS BIT(15)
> > +#define SPMMC_SDSTATUS_BOOT_ACK_TIMEOUT
> BIT(16)
> > +#define SPMMC_SDSTATUS_BOOT_DATA_TIMEOUT
> BIT(17)
> > +#define SPMMC_SDSTATUS_BOOT_ACK_ERROR
> BIT(18)
> > +
> > +#define SPMMC_SD_STATE_REG 0x00A4
> > +#define SPMMC_SDSTATE_ERROR BIT(13)
> > +#define SPMMC_SDSTATE_FINISH BIT(14)
> > +
> > +#define SPMMC_SD_HW_STATE_REG 0x00A8
> > +#define SPMMC_SD_BLOCKSIZE_REG 0x00AC
> > +#define SPMMC_SD_CONFIG1_REG 0x00B0
> > +#define SPMMC_SD_TIMING_CONFIG0_REG 0x00B4
> > +#define SPMMC_SD_PIODATATX_REG 0x00BC
> > +#define SPMMC_SD_PIODATARX_REG 0x00C0
> > +#define SPMMC_SD_CMDBUF0_3_REG 0x00C4
> > +#define SPMMC_SD_CMDBUF4_REG 0x00C8
> > +#define SPMMC_SD_RSPBUF0_3_REG 0x00CC
> > +#define SPMMC_SD_RSPBUF4_5_REG 0x00D0
> > +
> > +struct spmmc_tuning_info {
> > + int enable_tuning;
> > + int need_tuning;
> > +#define SPMMC_MAX_RETRIES (8 * 8)
> > + int retried; /* how many times has been retried */
> > + u32 rd_crc_dly:3;
> > + u32 rd_dat_dly:3;
> > + u32 rd_rsp_dly:3;
> > + u32 wr_cmd_dly:3;
> > + u32 wr_dat_dly:3;
> > + u32 clk_dly:3;
> > +};
> > +
> > +struct spmmc_host {
> > + void __iomem *base;
> > + struct clk *clk;
> > + struct reset_control *rstc;
> > + int mode; /* SD/SDIO/eMMC */
> > + spinlock_t lock; /* controller lock */
> > + struct mutex mrq_lock;
> > + /* tasklet used to handle error then finish the request */
> > + struct tasklet_struct tsklet_finish_req;
> > + struct mmc_host *mmc;
> > + struct mmc_request *mrq; /* current mrq */
> > +
> > + int irq;
> > + int use_int; /* should raise irq when done? */
> > + int power_state; /* current power state: off/up/on */
> > + int ddr_enabled;
> > + int signal_voltage;
> > +#define SPMMC_DMA_MODE 0
> > +#define SPMMC_PIO_MODE 1
> > + int dmapio_mode;
> > + /* for purpose of reducing context switch, only when transfer data
> that*/
> > + /* length is greater than `dma_int_threshold' should use interrupt
> */
> > + int dma_int_threshold;
> > + struct sg_mapping_iter sg_miter; /* for pio mode to access sglist
> */
> > + int dma_use_int; /* should raise irq when dma done */
> > + struct spmmc_tuning_info tuning_info;
> > +};
> > +
> > +static const u8 tuning_blk_pattern_4bit[] = {
> > + 0xff, 0x0f, 0xff, 0x00, 0xff, 0xcc, 0xc3, 0xcc,
> > + 0xc3, 0x3c, 0xcc, 0xff, 0xfe, 0xff, 0xfe, 0xef,
> > + 0xff, 0xdf, 0xff, 0xdd, 0xff, 0xfb, 0xff, 0xfb,
> > + 0xbf, 0xff, 0x7f, 0xff, 0x77, 0xf7, 0xbd, 0xef,
> > + 0xff, 0xf0, 0xff, 0xf0, 0x0f, 0xfc, 0xcc, 0x3c,
> > + 0xcc, 0x33, 0xcc, 0xcf, 0xff, 0xef, 0xff, 0xee,
> > + 0xff, 0xfd, 0xff, 0xfd, 0xdf, 0xff, 0xbf, 0xff,
> > + 0xbb, 0xff, 0xf7, 0xff, 0xf7, 0x7f, 0x7b, 0xde,
> > +};
> > +
> > +static const u8 tuning_blk_pattern_8bit[] = {
> > + 0xff, 0xff, 0x00, 0xff, 0xff, 0xff, 0x00, 0x00,
> > + 0xff, 0xff, 0xcc, 0xcc, 0xcc, 0x33, 0xcc, 0xcc,
> > + 0xcc, 0x33, 0x33, 0xcc, 0xcc, 0xcc, 0xff, 0xff,
> > + 0xff, 0xee, 0xff, 0xff, 0xff, 0xee, 0xee, 0xff,
> > + 0xff, 0xff, 0xdd, 0xff, 0xff, 0xff, 0xdd, 0xdd,
> > + 0xff, 0xff, 0xff, 0xbb, 0xff, 0xff, 0xff, 0xbb,
> > + 0xbb, 0xff, 0xff, 0xff, 0x77, 0xff, 0xff, 0xff,
> > + 0x77, 0x77, 0xff, 0x77, 0xbb, 0xdd, 0xee, 0xff,
> > + 0xff, 0xff, 0xff, 0x00, 0xff, 0xff, 0xff, 0x00,
> > + 0x00, 0xff, 0xff, 0xcc, 0xcc, 0xcc, 0x33, 0xcc,
> > + 0xcc, 0xcc, 0x33, 0x33, 0xcc, 0xcc, 0xcc, 0xff,
> > + 0xff, 0xff, 0xee, 0xff, 0xff, 0xff, 0xee, 0xee,
> > + 0xff, 0xff, 0xff, 0xdd, 0xff, 0xff, 0xff, 0xdd,
> > + 0xdd, 0xff, 0xff, 0xff, 0xbb, 0xff, 0xff, 0xff,
> > + 0xbb, 0xbb, 0xff, 0xff, 0xff, 0x77, 0xff, 0xff,
> > + 0xff, 0x77, 0x77, 0xff, 0x77, 0xbb, 0xdd, 0xee,
> > +};
> > +
> > +/* Produces a mask of set bits covering a range of a 32-bit value */
> > +static inline u32 bitfield_mask(u32 shift, u32 width)
> > +{
> > + return ((1 << width) - 1) << shift;
> > +}
> > +
> > +/* Extract the value of a bitfield found within a given register value */
> > +static inline u32 bitfield_extract(u32 reg_val, u32 shift, u32 width)
> > +{
> > + return (reg_val & bitfield_mask(shift, width)) >> shift;
> > +}
> > +
> > +/* Replace the value of a bitfield found within a given register value */
> > +static inline u32 bitfield_replace(u32 reg_val, u32 shift, u32 width, u32 val)
> > +{
> > + u32 mask = bitfield_mask(shift, width);
> > +
> > + return (reg_val & ~mask) | (val << shift);
> > +}
> > +
> > +/**
> > + * wait for transaction done, return -1 if error.
> > + */
> > +static inline int spmmc_wait_finish(struct spmmc_host *host)
> > +{
> > + /* Wait for transaction finish */
> > + unsigned long timeout = jiffies + msecs_to_jiffies(5000);
> > +
> > + while (!time_after(jiffies, timeout)) {
> > + if (readl(host->base + SPMMC_SD_STATE_REG) &
> SPMMC_SDSTATE_FINISH)
> > + return 0;
> > + if (readl(host->base + SPMMC_SD_STATE_REG) &
> SPMMC_SDSTATE_ERROR)
> > + return -1;
> > + }
> > + return -1;
> > +}
> > +
> > +static inline int spmmc_wait_sdstatus(struct spmmc_host *host, unsigned
> int status_bit)
> > +{
> > + unsigned long timeout = jiffies + msecs_to_jiffies(5000);
> > +
> > + while (!time_after(jiffies, timeout)) {
> > + if (readl(host->base + SPMMC_SD_STATUS_REG) &
> status_bit)
> > + return 0;
> > + if (readl(host->base + SPMMC_SD_STATE_REG) &
> SPMMC_SDSTATE_ERROR)
> > + return -1;
> > + }
> > + return -1;
> > +}
> > +
> > +#define spmmc_wait_rspbuf_full(host) spmmc_wait_sdstatus(host,
> SPMMC_SDSTATUS_RSP_BUF_FULL)
> > +#define spmmc_wait_rxbuf_full(host) spmmc_wait_sdstatus(host,
> SPMMC_SDSTATUS_RX_DATA_BUF_FULL)
> > +#define spmmc_wait_txbuf_empty(host) spmmc_wait_sdstatus(host,
> SPMMC_SDSTATUS_TX_DATA_BUF_EMPTY)
> > +
> > +static void spmmc_get_rsp(struct spmmc_host *host, struct
> mmc_command *cmd)
> > +{
> > + u32 value0_3, value4_5;
> > +
> > + if (unlikely(!(cmd->flags & MMC_RSP_PRESENT)))
> > + return;
> > + if (unlikely(cmd->flags & MMC_RSP_136)) {
> > + if (spmmc_wait_rspbuf_full(host))
> > + return;
> > + value0_3 = readl(host->base +
> SPMMC_SD_RSPBUF0_3_REG);
> > + value4_5 = readl(host->base +
> SPMMC_SD_RSPBUF4_5_REG) & 0xffff;
> > + cmd->resp[0] = (value0_3 << 8) | (value4_5 >> 8);
> > + cmd->resp[1] = value4_5 << 24;
> > + value0_3 = readl(host->base +
> SPMMC_SD_RSPBUF0_3_REG);
> > + value4_5 = readl(host->base +
> SPMMC_SD_RSPBUF4_5_REG) & 0xffff;
> > + cmd->resp[1] |= value0_3 >> 8;
> > + cmd->resp[2] = value0_3 << 24;
> > + cmd->resp[2] |= value4_5 << 8;
> > + value0_3 = readl(host->base +
> SPMMC_SD_RSPBUF0_3_REG);
> > + value4_5 = readl(host->base +
> SPMMC_SD_RSPBUF4_5_REG) & 0xffff;
> > + cmd->resp[2] |= value0_3 >> 24;
> > + cmd->resp[3] = value0_3 << 8;
> > + cmd->resp[3] |= value4_5 >> 8;
> > + } else {
> > + if (spmmc_wait_rspbuf_full(host))
> > + return;
> > + value0_3 = readl(host->base +
> SPMMC_SD_RSPBUF0_3_REG);
> > + value4_5 = readl(host->base +
> SPMMC_SD_RSPBUF4_5_REG) & 0xffff;
> > + cmd->resp[0] = (value0_3 << 8) | (value4_5 >> 8);
> > + cmd->resp[1] = value4_5 << 24;
> > + }
> > + //return;
> > +}
> > +
> > +static void spmmc_set_bus_clk(struct spmmc_host *host, int clk)
> > +{
> > + unsigned int clkdiv;
> > + int f_min = host->mmc->f_min;
> > + int f_max = host->mmc->f_max;
> > + u32 value = readl(host->base + SPMMC_SD_CONFIG0_REG);
> > +
> > + if (clk < f_min)
> > + clk = f_min;
> > + if (clk > f_max)
> > + clk = f_max;
> > +
> > + clkdiv = (clk_get_rate(host->clk) + clk) / clk - 1;
> > + if (clkdiv > 0xfff)
> > + clkdiv = 0xfff;
> > +
> > + value = bitfield_replace(value, 20, 12, clkdiv);
> > + writel(value, host->base + SPMMC_SD_CONFIG0_REG);
> > +
> > + /* In order to reduce the frequency of context switch,
> > + * if it is high speed or upper, we do not use interrupt
> > + * when send a command that without data transferring.
> > + */
> > + if (clk > 25000000)
> > + host->use_int = 0;
> > + else
> > + host->use_int = 1;
> > +}
> > +
> > +static void spmmc_set_bus_timing(struct spmmc_host *host, unsigned int
> timing)
> > +{
> > + u32 value = readl(host->base + SPMMC_SD_CONFIG1_REG);
> > + int clkdiv = readl(host->base + SPMMC_SD_CONFIG0_REG) >> 20;
> > + int delay = clkdiv / 2 < 7 ? clkdiv / 2 : 7;
> > + int hs_en = 1;
> > + char *timing_name;
> > +
> > + host->ddr_enabled = 0;
> > + switch (timing) {
> > + case MMC_TIMING_LEGACY:
> > + hs_en = 0;
> > + timing_name = "legacy";
> > + break;
> > + case MMC_TIMING_MMC_HS:
> > + timing_name = "mmc high-speed";
> > + break;
> > + case MMC_TIMING_SD_HS:
> > + timing_name = "sd high-speed";
> > + break;
> > + case MMC_TIMING_UHS_SDR50:
> > + timing_name = "sd uhs SDR50";
> > + break;
> > + case MMC_TIMING_UHS_SDR104:
> > + timing_name = "sd uhs SDR104";
> > + break;
> > + case MMC_TIMING_UHS_DDR50:
> > + host->ddr_enabled = 1;
> > + timing_name = "sd uhs DDR50";
> > + break;
> > + case MMC_TIMING_MMC_DDR52:
> > + host->ddr_enabled = 1;
> > + timing_name = "mmc DDR52";
> > + break;
> > + case MMC_TIMING_MMC_HS200:
> > + timing_name = "mmc HS200";
> > + break;
> > + default:
> > + timing_name = "invalid";
> > + hs_en = 0;
> > + break;
> > + }
> > +
> > + if (hs_en) {
> > + value = bitfield_replace(value, 31, 1, 1); /*
> sd_high_speed_en */
> > + writel(value, host->base + SPMMC_SD_CONFIG1_REG);
> > + value = readl(host->base +
> SPMMC_SD_TIMING_CONFIG0_REG);
> > + value = bitfield_replace(value, 4, 3, delay); /*
> sd_wr_dat_dly_sel */
> > + value = bitfield_replace(value, 8, 3, delay); /*
> sd_wr_cmd_dly_sel */
> > + writel(value, host->base +
> SPMMC_SD_TIMING_CONFIG0_REG);
> > + } else {
> > + value = bitfield_replace(value, 31, 1, 0);
> > + writel(value, host->base + SPMMC_SD_CONFIG1_REG);
> > + }
> > + if (host->ddr_enabled) {
> > + value = readl(host->base + SPMMC_SD_CONFIG0_REG);
> > + value = bitfield_replace(value, 1, 1, 1); /* sdddrmode */
> > + writel(value, host->base + SPMMC_SD_CONFIG0_REG);
> > + } else {
> > + value = readl(host->base + SPMMC_SD_CONFIG0_REG);
> > + value = bitfield_replace(value, 1, 1, 0);
> > + writel(value, host->base + SPMMC_SD_CONFIG0_REG);
> > + }
> > +}
> > +
> > +static void spmmc_set_bus_width(struct spmmc_host *host, int width)
> > +{
> > + u32 value = readl(host->base + SPMMC_SD_CONFIG0_REG);
> > + int bus_width;
> > +
> > + switch (width) {
> > + case MMC_BUS_WIDTH_8:
> > + value = bitfield_replace(value, 11, 1, 0);
> > + value = bitfield_replace(value, 18, 1, 1);
> > + bus_width = 8;
> > + break;
> > + case MMC_BUS_WIDTH_4:
> > + value = bitfield_replace(value, 11, 1, 1);
> > + value = bitfield_replace(value, 18, 1, 0);
> > + bus_width = 4;
> > + break;
> > + default:
> > + value = bitfield_replace(value, 11, 1, 0);
> > + value = bitfield_replace(value, 18, 1, 0);
> > + bus_width = 1;
> > + break;
> > + };
> > + writel(value, host->base + SPMMC_SD_CONFIG0_REG);
> > +}
> > +
> > +/**
> > + * select the working mode of controller: sd/sdio/emmc
> > + */
> > +static void spmmc_select_mode(struct spmmc_host *host, int mode)
> > +{
> > + u32 value = readl(host->base + SPMMC_SD_CONFIG0_REG);
> > +
> > + host->mode = mode;
> > + /* set `sdmmcmode', as it will sample data at fall edge */
> > + /* of SD bus clock if `sdmmcmode' is not set when */
> > + /* `sd_high_speed_en' is not set, which is not compliant */
> > + /* with SD specification */
> > + value = bitfield_replace(value, 10, 1, 1);
> > + switch (mode) {
> > + case SPMMC_MODE_EMMC:
> > + value = bitfield_replace(value, 9, 1, 0);
> > + writel(value, host->base + SPMMC_SD_CONFIG0_REG);
> > + break;
> > + case SPMMC_MODE_SDIO:
> > + value = bitfield_replace(value, 9, 1, 1);
> > + writel(value, host->base + SPMMC_SD_CONFIG0_REG);
> > + value = readl(host->base + SPMMC_SDIO_CTRL_REG);
> > + value = bitfield_replace(value, 6, 1, 1); /* int_multi_trig
> */
> > + writel(value, host->base + SPMMC_SDIO_CTRL_REG);
> > + break;
> > + case SPMMC_MODE_SD:
> > + default:
> > + value = bitfield_replace(value, 9, 1, 0);
> > + writel(value, host->base + SPMMC_SD_CONFIG0_REG);
> > + break;
> > + }
> > +}
> > +
> > +static void spmmc_sw_reset(struct spmmc_host *host)
> > +{
> > + u32 value;
> > +
> > + /* Must reset dma operation first, or it will*/
> > + /* be stuck on sd_state == 0x1c00 because of*/
> > + /* a controller software reset bug */
> > + value = readl(host->base + SPMMC_HW_DMA_CTRL_REG);
> > + value = bitfield_replace(value, 10, 1, 1);
> > + writel(value, host->base + SPMMC_HW_DMA_CTRL_REG);
> > + value = bitfield_replace(value, 10, 1, 0);
> > + writel(value, host->base + SPMMC_HW_DMA_CTRL_REG);
> > + value = readl(host->base + SPMMC_HW_DMA_CTRL_REG);
> > + value = bitfield_replace(value, 9, 1, 1);
> > + writel(value, host->base + SPMMC_HW_DMA_CTRL_REG);
> > + writel(0x7, host->base + SPMMC_SD_RST_REG);
> > + while (readl(host->base + SPMMC_SD_HW_STATE_REG) & BIT(6))
> > + ;
> > +}
> > +
> > +static void spmmc_prepare_cmd(struct spmmc_host *host, struct
> mmc_command *cmd)
> > +{
> > + u32 value;
> > +
> > + /* add start bit, according to spec, command format */
> > + value = ((cmd->opcode | 0x40) << 24) | (cmd->arg >> 8);
> > + writel(value, host->base + SPMMC_SD_CMDBUF0_3_REG);
> > + writeb(cmd->arg & 0xff, host->base +
> SPMMC_SD_CMDBUF4_REG);
> > +
> > + /* disable interrupt if needed */
> > + value = readl(host->base + SPMMC_SD_INT_REG);
> > + value = bitfield_replace(value, 2, 1, 1); /* sd_cmp_clr */
> > + if (likely(!host->use_int || cmd->flags & MMC_RSP_136))
> > + value = bitfield_replace(value, 0, 1, 0); /* sdcmpen */
> > + else
> > + value = bitfield_replace(value, 0, 1, 1);
> > + writel(value, host->base + SPMMC_SD_INT_REG);
> > +
> > + value = readl(host->base + SPMMC_SD_CONFIG0_REG);
> > + value = bitfield_replace(value, 4, 2, 0); /* sd_trans_mode */
> > + value = bitfield_replace(value, 7, 1, 1); /* sdcmddummy */
> > + if (likely(cmd->flags & MMC_RSP_PRESENT)) {
> > + value = bitfield_replace(value, 6, 1, 1); /* sdautorsp */
> > + } else {
> > + value = bitfield_replace(value, 6, 1, 0);
> > + writel(value, host->base + SPMMC_SD_CONFIG0_REG);
> > + return;
> > + }
> > + /*
> > + * Currently, host is not capable of checking R2's CRC7,
> > + * thus, enable crc7 check only for 48 bit response commands
> > + */
> > + if (likely(cmd->flags & MMC_RSP_CRC && !(cmd->flags &
> MMC_RSP_136)))
> > + value = bitfield_replace(value, 8, 1, 1); /* sdrspchk_en */
> > + else
> > + value = bitfield_replace(value, 8, 1, 0);
> > +
> > + if (unlikely(cmd->flags & MMC_RSP_136))
> > + value = bitfield_replace(value, 15, 1, 1); /* sdrsptype */
> > + else
> > + value = bitfield_replace(value, 15, 1, 0);
> > + writel(value, host->base + SPMMC_SD_CONFIG0_REG);
> > +}
> > +
> > +static void spmmc_prepare_data(struct spmmc_host *host, struct
> mmc_data *data)
> > +{
> > + u32 value, srcdst;
> > + //struct mmc_command *cmd = data->mrq->cmd;
> > +
> > + writel(data->blocks - 1, host->base +
> SPMMC_SD_PAGE_NUM_REG);
> > + writel(data->blksz - 1, host->base + SPMMC_SD_BLOCKSIZE_REG);
> > + value = readl(host->base + SPMMC_SD_CONFIG0_REG);
> > + if (data->flags & MMC_DATA_READ) {
> > + value = bitfield_replace(value, 4, 2, 2); /* sd_trans_mode
> */
> > + value = bitfield_replace(value, 6, 1, 0); /* sdautorsp */
> > + value = bitfield_replace(value, 7, 1, 0); /* sdcmddummy
> */
> > + srcdst = readl(host->base +
> SPMMC_CARD_MEDIATYPE_SRCDST_REG);
> > + srcdst = bitfield_replace(srcdst, 4, 7, 0x12);
> > + writel(srcdst, host->base +
> SPMMC_CARD_MEDIATYPE_SRCDST_REG);
> > + } else {
> > + value = bitfield_replace(value, 4, 2, 1);
> > + srcdst = readl(host->base +
> SPMMC_CARD_MEDIATYPE_SRCDST_REG);
> > + srcdst = bitfield_replace(srcdst, 4, 7, 0x21);
> > + writel(srcdst, host->base +
> SPMMC_CARD_MEDIATYPE_SRCDST_REG);
> > + }
> > + value = bitfield_replace(value, 2, 1, 1);
> > + if (likely(host->dmapio_mode == SPMMC_DMA_MODE)) {
> > + struct scatterlist *sg;
> > + dma_addr_t dma_addr;
> > + unsigned int dma_size;
> > + u32 *reg_addr;
> > + int dma_direction = data->flags & MMC_DATA_READ ?
> DMA_FROM_DEVICE : DMA_TO_DEVICE;
> > + int i, count = 1;
> > +
> > + count = dma_map_sg(host->mmc->parent, data->sg,
> data->sg_len, dma_direction);
> > + if (unlikely(!count || count >
> SPMMC_MAX_DMA_MEMORY_SECTORS)) {
> > + data->error = -EINVAL;
> > + return;
> > + }
> > + for_each_sg(data->sg, sg, count, i) {
> > + dma_addr = sg_dma_address(sg);
> > + dma_size = sg_dma_len(sg) / 512 - 1;
> > + if (i == 0) {
> > + writel(dma_addr, host->base +
> SPMMC_DMA_BASE_ADDR_REG);
> > + writel(dma_size, host->base +
> SPMMC_SDRAM_SECTOR_0_SIZE_REG);
> > + } else {
> > + reg_addr = host->base +
> SPMMC_SDRAM_SECTOR_1_ADDR_REG + (i - 1) * 2;
> > + writel(dma_addr, reg_addr);
> > + writel(dma_size, reg_addr + 1);
> > + }
> > + }
> > + value = bitfield_replace(value, 0, 1, 0); /* sdpiomode */
> > + writel(value, host->base + SPMMC_SD_CONFIG0_REG);
> > + /* enable interrupt if needed */
> > + if (!host->use_int && data->blksz * data->blocks >
> host->dma_int_threshold) {
> > + host->dma_use_int = 1;
> > + value = readl(host->base +
> SPMMC_SD_INT_REG);
> > + value = bitfield_replace(value, 0, 1, 1); /*
> sdcmpen */
> > + writel(value, host->base +
> SPMMC_SD_INT_REG);
> > + }
> > + } else {
> > + value = bitfield_replace(value, 0, 1, 1);
> > + value = bitfield_replace(value, 14, 1, 1); /* rx4_en */
> > + writel(value, host->base + SPMMC_SD_CONFIG0_REG);
> > + }
> > +}
> > +
> > +static inline void spmmc_trigger_transaction(struct spmmc_host *host)
> > +{
> > + u32 value = readl(host->base + SPMMC_SD_CTRL_REG);
> > +
> > + value = bitfield_replace(value, 0, 1, 1); /* trigger transaction */
> > + writel(value, host->base + SPMMC_SD_CTRL_REG);
> > +}
> > +
> > +static void __send_stop_cmd(struct spmmc_host *host)
> > +{
> > + struct mmc_command stop = {};
> > + u32 value;
> > +
> > + stop.opcode = MMC_STOP_TRANSMISSION;
> > + stop.arg = 0;
> > + stop.flags = MMC_RSP_R1B;
> > + spmmc_prepare_cmd(host, &stop);
> > + value = readl(host->base + SPMMC_SD_INT_REG);
> > + value = bitfield_replace(value, 0, 1, 0); /* sdcmpen */
> > + writel(value, host->base + SPMMC_SD_INT_REG);
> > + spmmc_trigger_transaction(host);
> > + spmmc_wait_finish(host);
> > +}
> > +
> > +/**
> > + * check if error occurred during transaction.
> > + * @host - host
> > + * @mrq - the mrq
> > + * @return 0 if no error otherwise the error number.
> > + */
> > +static int spmmc_check_error(struct spmmc_host *host, struct
> mmc_request *mrq)
> > +{
> > + int ret = 0;
> > + struct mmc_command *cmd = mrq->cmd;
> > + struct mmc_data *data = mrq->data;
> > +
> > + u32 value = readl(host->base + SPMMC_SD_STATE_REG);
> > + u32 crc_token = bitfield_extract(value, 4, 3);
> > +
> > + if (unlikely(value & SPMMC_SDSTATE_ERROR)) {
> > + u32 timing_cfg0 = 0;
> > +
> > + value = readl(host->base + SPMMC_SD_STATUS_REG);
> > +
> > + if (host->tuning_info.enable_tuning) {
> > + timing_cfg0 = readl(host->base +
> SPMMC_SD_TIMING_CONFIG0_REG);
> > + host->tuning_info.rd_crc_dly =
> bitfield_extract(timing_cfg0, 20, 3);
> > + host->tuning_info.rd_dat_dly =
> bitfield_extract(timing_cfg0, 16, 3);
> > + host->tuning_info.rd_rsp_dly =
> bitfield_extract(timing_cfg0, 12, 3);
> > + host->tuning_info.wr_cmd_dly =
> bitfield_extract(timing_cfg0, 8, 3);
> > + host->tuning_info.wr_dat_dly =
> bitfield_extract(timing_cfg0, 4, 3);
> > + }
> > +
> > + if (value & SPMMC_SDSTATUS_RSP_TIMEOUT) {
> > + ret = -ETIMEDOUT;
> > + host->tuning_info.wr_cmd_dly++;
> > + } else if (value & SPMMC_SDSTATUS_RSP_CRC7_ERROR)
> {
> > + ret = -EILSEQ;
> > + host->tuning_info.rd_rsp_dly++;
> > + } else if (data) {
> > + if ((value & SPMMC_SDSTATUS_STB_TIMEOUT))
> {
> > + ret = -ETIMEDOUT;
> > + host->tuning_info.rd_dat_dly++;
> > + } else if (value &
> SPMMC_SDSTATUS_RDATA_CRC16_ERROR) {
> > + ret = -EILSEQ;
> > + host->tuning_info.rd_dat_dly++;
> > + } else if (value &
> SPMMC_SDSTATUS_CARD_CRC_CHECK_TIMEOUT) {
> > + ret = -ETIMEDOUT;
> > + host->tuning_info.rd_crc_dly++;
> > + } else if (value &
> SPMMC_SDSTATUS_CRC_TOKEN_CHECK_ERROR) {
> > + ret = -EILSEQ;
> > + if (crc_token == 0x5)
> > +
> host->tuning_info.wr_dat_dly++;
> > + else
> > +
> host->tuning_info.rd_crc_dly++;
> > + }
> > + }
> > + cmd->error = ret;
> > + if (data) {
> > + data->error = ret;
> > + data->bytes_xfered = 0;
> > + }
> > + if (!host->tuning_info.need_tuning &&
> host->tuning_info.enable_tuning)
> > + cmd->retries = SPMMC_MAX_RETRIES; /* retry
> it */
> > + spmmc_sw_reset(host);
> > + mdelay(5);
> > +
> > + if (host->tuning_info.enable_tuning) {
> > + timing_cfg0 = bitfield_replace(timing_cfg0, 20,
> 3,
> > +
> host->tuning_info.rd_crc_dly);
> > + timing_cfg0 = bitfield_replace(timing_cfg0, 16,
> 3,
> > +
> host->tuning_info.rd_dat_dly);
> > + timing_cfg0 = bitfield_replace(timing_cfg0, 12,
> 3,
> > +
> host->tuning_info.rd_rsp_dly);
> > + timing_cfg0 = bitfield_replace(timing_cfg0, 8,
> 3,
> > +
> host->tuning_info.wr_cmd_dly);
> > + timing_cfg0 = bitfield_replace(timing_cfg0, 4,
> 3,
> > +
> host->tuning_info.wr_dat_dly);
> > + writel(timing_cfg0, host->base +
> SPMMC_SD_TIMING_CONFIG0_REG);
> > + }
> > + } else if (data) {
> > + data->error = 0;
> > + data->bytes_xfered = data->blocks * data->blksz;
> > + }
> > + host->tuning_info.need_tuning = ret;
> > + /* controller will not send cmd 12 automatically if error occurred */
> > + if (cmd->opcode == MMC_READ_MULTIPLE_BLOCK ||
> > + cmd->opcode == MMC_WRITE_MULTIPLE_BLOCK) {
> > + __send_stop_cmd(host);
> > + spmmc_sw_reset(host);
> > + }
> > + return ret;
> > +}
> > +
> > +/**
> > + * the strategy is:
> > + * 1. if several continuous delays are acceptable, we choose a middle one;
> > + * 2. otherwise, we choose the first one.
> > + */
> > +static inline int __find_best_delay(u8 candidate_dly)
> > +{
> > + int f, w;
> > +
> > + if (!candidate_dly)
> > + return 0;
> > + f = ffs(candidate_dly) - 1;
> > + w = hweight8(candidate_dly);
> > + if (0xff == (bitfield_mask(f, w) & ~candidate_dly))
> > + return (f + w / 2);
> > + else
> > + return (f);
> > +}
> > +
> > +static inline __maybe_unused void spmmc_txdummy(struct spmmc_host
> *host, int count)
> > +{
> > + u32 value;
> > +
> > + count &= 0x1ff;
> > + value = readl(host->base + SPMMC_SD_CONFIG1_REG);
> > + value = bitfield_replace(value, 0, 9, count);
> > + writel(value, host->base + SPMMC_SD_CONFIG1_REG);
> > + value = readl(host->base + SPMMC_SD_CTRL_REG);
> > + value = bitfield_replace(value, 1, 1, 1); /* trigger tx dummy */
> > + writel(value, host->base + SPMMC_SD_CTRL_REG);
> > +}
> > +
> > +static void spmmc_xfer_data_pio(struct spmmc_host *host, struct
> mmc_data *data)
> > +{
> > + u32 *buf; /* tx/rx 4 bytes one time in pio mode */
> > + int data_left = data->blocks * data->blksz;
> > + int consumed, remain;
> > +
> > + struct sg_mapping_iter *sg_miter = &host->sg_miter;
> > + unsigned int flags = 0;
> > +
> > + if (data->flags & MMC_DATA_WRITE)
> > + flags |= SG_MITER_FROM_SG;
> > + else
> > + flags |= SG_MITER_TO_SG;
> > + sg_miter_start(&host->sg_miter, data->sg, data->sg_len, flags);
> > + while (data_left > 0) {
> > + consumed = 0;
> > + if (!sg_miter_next(sg_miter))
> > + break;
> > + buf = sg_miter->addr;
> > + remain = sg_miter->length;
> > + do {
> > + if (data->flags & MMC_DATA_WRITE) {
> > + if (spmmc_wait_txbuf_empty(host))
> > + goto done;
> > + writel(*buf, host->base +
> SPMMC_SD_PIODATATX_REG);
> > + } else {
> > + if (spmmc_wait_rxbuf_full(host))
> > + goto done;
> > + *buf = readl(host->base +
> SPMMC_SD_PIODATARX_REG);
> > + }
> > + buf++;
> > + consumed += 4;
> > + remain -= 4;
> > + } while (remain);
> > + sg_miter->consumed = consumed;
> > + data_left -= consumed;
> > + }
> > +done:
> > + sg_miter_stop(sg_miter);
> > +}
> > +
> > +static void spmmc_controller_init(struct spmmc_host *host)
> > +{
> > + u32 value;
> > + int ret = reset_control_assert(host->rstc);
> > +
> > + if (!ret) {
> > + mdelay(1);
> > + ret = reset_control_deassert(host->rstc);
> > + }
> > +
> > + value = readl(host->base +
> SPMMC_CARD_MEDIATYPE_SRCDST_REG);
> > + value = bitfield_replace(value, 0, 3, SPMMC_MEDIA_SD);
> > + writel(value, host->base +
> SPMMC_CARD_MEDIATYPE_SRCDST_REG);
> > + host->signal_voltage = MMC_SIGNAL_VOLTAGE_330;
> > +}
> > +
> > +static void spmmc_set_power_mode(struct spmmc_host *host, struct
> mmc_ios *ios)
> > +{
> > + if (host->power_state == ios->power_mode)
> > + return;
> > +
> > + switch (ios->power_mode) {
> > + /* power off->up->on */
> > + case MMC_POWER_ON:
> > + spmmc_controller_init(host);
> > + pm_runtime_get_sync(host->mmc->parent);
> > + break;
> > + case MMC_POWER_UP:
> > + break;
> > + case MMC_POWER_OFF:
> > + pm_runtime_put(host->mmc->parent);
> > + break;
> > + }
> > + host->power_state = ios->power_mode;
> > +}
> > +
> > +/**
> > + * 1. unmap scatterlist if needed;
> > + * 2. get response & check error conditions;
> > + * 3. unlock host->mrq_lock
> > + * 4. notify mmc layer the request is done
> > + */
> > +static void spmmc_finish_request(struct spmmc_host *host, struct
> mmc_request *mrq)
> > +{
> > + struct mmc_command *cmd;
> > + struct mmc_data *data;
> > +
> > + if (!mrq)
> > + return;
> > +
> > + cmd = mrq->cmd;
> > + data = mrq->data;
> > +
> > + if (data && SPMMC_DMA_MODE == host->dmapio_mode) {
> > + int dma_direction = data->flags & MMC_DATA_READ ?
> DMA_FROM_DEVICE : DMA_TO_DEVICE;
> > +
> > + dma_unmap_sg(host->mmc->parent, data->sg,
> data->sg_len, dma_direction);
> > + host->dma_use_int = 0;
> > + }
> > + spmmc_get_rsp(host, cmd);
> > + spmmc_check_error(host, mrq);
> > + host->mrq = NULL;
> > + mutex_unlock(&host->mrq_lock);
> > + mmc_request_done(host->mmc, mrq);
> > +}
> > +
> > +/* Interrupt Service Routine */
> > +irqreturn_t spmmc_irq(int irq, void *dev_id)
> > +{
> > + struct spmmc_host *host = dev_id;
> > + u32 value = readl(host->base + SPMMC_SD_INT_REG);
> > +
> > + spin_lock(&host->lock);
> > + if ((value & SPMMC_SDINT_SDCMP) && (value &
> SPMMC_SDINT_SDCMPEN)) {
> > + value = bitfield_replace(value, 0, 1, 0); /* disable sdcmp
> */
> > + value = bitfield_replace(value, 2, 1, 1); /* sd_cmp_clr */
> > + writel(value, host->base + SPMMC_SD_INT_REG);
> > + /* if error occurred, we my need send cmd 12 to stop
> data transaction,*/
> > + /* which is time consuming, so make use of tasklet to
> handle this.*/
> > + if (unlikely(readl(host->base + SPMMC_SD_STATE_REG)
> & SPMMC_SDSTATE_ERROR))
> > + tasklet_schedule(&host->tsklet_finish_req);
> > + else
> > + spmmc_finish_request(host, host->mrq);
> > + }
> > + if (value & SPMMC_SDINT_SDIO &&
> > + (value & SPMMC_SDINT_SDIOEN)) {
> > + mmc_signal_sdio_irq(host->mmc);
> > + }
> > + spin_unlock(&host->lock);
> > + return IRQ_HANDLED;
> > +}
> > +
> > +static void spmmc_request(struct mmc_host *mmc, struct mmc_request
> *mrq)
> > +{
> > + struct spmmc_host *host = mmc_priv(mmc);
> > + struct mmc_data *data;
> > + struct mmc_command *cmd;
> > + int ret;
> > +
> > + ret = mutex_lock_interruptible(&host->mrq_lock);
> > + if (ret)
> > + return;
> > +
> > + host->mrq = mrq;
> > + data = mrq->data;
> > + cmd = mrq->cmd;
> > +
> > + spmmc_prepare_cmd(host, cmd);
> > + /* we need manually read response R2. */
> > + if (unlikely(cmd->flags & MMC_RSP_136)) {
> > + spmmc_trigger_transaction(host);
> > + spmmc_get_rsp(host, cmd);
> > + spmmc_wait_finish(host);
> > + spmmc_check_error(host, mrq);
> > + host->mrq = NULL;
> > + mutex_unlock(&host->mrq_lock);
> > + mmc_request_done(host->mmc, mrq);
> > + } else {
> > + if (data)
> > + spmmc_prepare_data(host, data);
> > +
> > + if (unlikely(host->dmapio_mode == SPMMC_PIO_MODE
> && data)) {
> > + u32 value;
> > + /* pio data transfer do not use interrupt */
> > + value = readl(host->base +
> SPMMC_SD_INT_REG);
> > + value = bitfield_replace(value, 0, 1, 0); /*
> sdcmpen */
> > + writel(value, host->base +
> SPMMC_SD_INT_REG);
> > + spmmc_trigger_transaction(host);
> > + spmmc_xfer_data_pio(host, data);
> > + spmmc_wait_finish(host);
> > + spmmc_finish_request(host, mrq);
> > + } else {
> > + if (!(host->use_int || host->dma_use_int)) {
> > + spmmc_trigger_transaction(host);
> > + spmmc_wait_finish(host);
> > + spmmc_finish_request(host, mrq);
> > + } else {
> > + spmmc_trigger_transaction(host);
> > + }
> > + }
> > + }
> > +}
> > +
> > +static void spmmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
> > +{
> > + struct spmmc_host *host = (struct spmmc_host *)mmc_priv(mmc);
> > +
> > + mutex_lock(&host->mrq_lock);
> > + spmmc_set_power_mode(host, ios);
> > + spmmc_set_bus_clk(host, ios->clock);
> > + spmmc_set_bus_timing(host, ios->timing);
> > + spmmc_set_bus_width(host, ios->bus_width);
> > + /* ensure mode is correct, because we might have hw reset the
> controller */
> > + spmmc_select_mode(host, host->mode);
> > + mutex_unlock(&host->mrq_lock);
> > + //return;
> > +}
> > +
> > +/**
> > + * Return values for the get_cd callback should be:
> > + * 0 for a absent card
> > + * 1 for a present card
> > + * -ENOSYS when not supported (equal to NULL callback)
> > + * or a negative errno value when something bad happened
> > + */
> > +int spmmc_get_cd(struct mmc_host *mmc)
> > +{
> > + int ret = 0;
> > +
> > + if (mmc_can_gpio_cd(mmc))
> > + ret = mmc_gpio_get_cd(mmc);
> > +
> > + if (ret < 0)
> > + ret = 0;
> > +
> > + return ret;
> > +}
> > +
> > +static int spmmc_execute_tuning(struct mmc_host *mmc, u32 opcode)
> > +{
> > + struct spmmc_host *host = mmc_priv(mmc);
> > + const u8 *blk_pattern;
> > + u8 *blk_test;
> > + int blksz;
> > + u8 smpl_dly = 0, candidate_dly = 0;
> > + u32 value;
> > +
> > + if (mmc->ios.bus_width == MMC_BUS_WIDTH_8) {
> > + blk_pattern = tuning_blk_pattern_8bit;
> > + blksz = sizeof(tuning_blk_pattern_8bit);
> > + } else if (mmc->ios.bus_width == MMC_BUS_WIDTH_4) {
> > + blk_pattern = tuning_blk_pattern_4bit;
> > + blksz = sizeof(tuning_blk_pattern_4bit);
> > + } else {
> > + return -EINVAL;
> > + }
> > +
> > + blk_test = kmalloc(blksz, GFP_KERNEL);
> > + if (!blk_test)
> > + return -ENOMEM;
> > +
> > + host->tuning_info.enable_tuning = 0;
> > + do {
> > + struct mmc_request mrq = {NULL};
> > + struct mmc_command cmd = {0};
> > + struct mmc_command stop = {0};
> > + struct mmc_data data = {0};
> > + struct scatterlist sg;
> > +
> > + cmd.opcode = opcode;
> > + cmd.arg = 0;
> > + cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
> > +
> > + stop.opcode = MMC_STOP_TRANSMISSION;
> > + stop.arg = 0;
> > + stop.flags = MMC_RSP_R1B | MMC_CMD_AC;
> > +
> > + data.blksz = blksz;
> > + data.blocks = 1;
> > + data.flags = MMC_DATA_READ;
> > + data.sg = &sg;
> > + data.sg_len = 1;
> > +
> > + sg_init_one(&sg, blk_test, blksz);
> > + mrq.cmd = &cmd;
> > + mrq.stop = &stop;
> > + mrq.data = &data;
> > + host->mrq = &mrq;
> > +
> > + value = readl(host->base +
> SPMMC_SD_TIMING_CONFIG0_REG);
> > + value = bitfield_replace(value, 12, 3, smpl_dly); /*
> sd_rd_rsp_dly_sel */
> > + value = bitfield_replace(value, 16, 3, smpl_dly); /*
> sd_rd_dat_dly_sel */
> > + value = bitfield_replace(value, 20, 3, smpl_dly); /*
> sd_rd_crc_dly_sel */
> > + writel(value, host->base +
> SPMMC_SD_TIMING_CONFIG0_REG);
> > +
> > + mmc_wait_for_req(mmc, &mrq);
> > + if (!cmd.error && !data.error) {
> > + if (!memcmp(blk_pattern, blk_test, blksz))
> > + candidate_dly |= (1 << smpl_dly);
> > + }
> > + } while (smpl_dly++ <= SPMMC_MAX_TUNABLE_DLY);
> > + host->tuning_info.enable_tuning = 1;
> > +
> > + if (candidate_dly) {
> > + smpl_dly = __find_best_delay(candidate_dly);
> > + value = readl(host->base +
> SPMMC_SD_TIMING_CONFIG0_REG);
> > + value = bitfield_replace(value, 12, 3, smpl_dly); /*
> sd_rd_rsp_dly_sel */
> > + value = bitfield_replace(value, 16, 3, smpl_dly); /*
> sd_rd_dat_dly_sel */
> > + value = bitfield_replace(value, 20, 3, smpl_dly); /*
> sd_rd_crc_dly_sel */
> > + writel(value, host->base +
> SPMMC_SD_TIMING_CONFIG0_REG);
> > + return 0;
> > + }
> > + return -EIO;
> > +}
> > +
> > +static void spmmc_enable_sdio_irq(struct mmc_host *mmc, int enable)
> > +{
> > + struct spmmc_host *host = mmc_priv(mmc);
> > + u32 value = readl(host->base + SPMMC_SD_INT_REG);
> > +
> > + value = bitfield_replace(value, 5, 1, 1); /* sdio_int_clr */
> > + if (enable)
> > + value = bitfield_replace(value, 3, 1, 1);
> > + else
> > + value = bitfield_replace(value, 3, 1, 0);
> > + writel(value, host->base + SPMMC_SD_INT_REG);
> > +}
> > +
> > +static const struct mmc_host_ops spmmc_ops = {
> > + .request = spmmc_request,
> > + .set_ios = spmmc_set_ios,
> > + .get_cd = spmmc_get_cd,
> > + .execute_tuning = spmmc_execute_tuning,
> > + .enable_sdio_irq = spmmc_enable_sdio_irq,
> > +};
> > +
> > +static void tsklet_func_finish_req(unsigned long data)
> > +{
> > + struct spmmc_host *host = (struct spmmc_host *)data;
> > +
> > + spin_lock(&host->lock);
> > + spmmc_finish_request(host, host->mrq);
> > + spin_unlock(&host->lock);
> > +}
> > +
> > +static int spmmc_drv_probe(struct platform_device *pdev)
> > +{
> > + int ret = 0;
> > + struct mmc_host *mmc;
> > + struct resource *res;
> > + struct spmmc_host *host;
> > + unsigned int mode;
> > +
> > + mmc = mmc_alloc_host(sizeof(*host), &pdev->dev);
> > + if (!mmc) {
> > + ret = -ENOMEM;
> > + goto probe_free_host;
> > + }
> > +
> > + host = mmc_priv(mmc);
> > + host->mmc = mmc;
> > + host->power_state = MMC_POWER_OFF;
> > + host->dma_int_threshold = 1024;
> > + host->dmapio_mode = SPMMC_DMA_MODE;
> > +
> > + host->base = devm_platform_get_and_ioremap_resource(pdev, 0,
> &res);
> > + if (IS_ERR(host->base))
> > + return PTR_ERR(host->base);
> > +
> > + host->clk = devm_clk_get(&pdev->dev, NULL);
> > + if (IS_ERR(host->clk)) {
> > + dev_err(&pdev->dev, "Can not find clock source\n");
> > + ret = PTR_ERR(host->clk);
> > + goto probe_free_host;
> > + }
> > +
> > + host->rstc = devm_reset_control_get_exclusive(&pdev->dev, NULL);
> > + if (IS_ERR(host->rstc)) {
> > + dev_err(&pdev->dev, "Can not find reset controller\n");
> > + ret = PTR_ERR(host->rstc);
> > + goto probe_free_host;
> > + }
> > +
> > + host->irq = platform_get_irq(pdev, 0);
> > + if (host->irq <= 0) {
> > + dev_err(&pdev->dev, "get sd irq resource fail\n");
> > + ret = -EINVAL;
> > + goto probe_free_host;
> > + }
> > + if (devm_request_irq(&pdev->dev, host->irq, spmmc_irq,
> IRQF_SHARED,
> > + dev_name(&pdev->dev), host)) {
> > + dev_err(&pdev->dev, "Failed to request sd card
> interrupt.\n");
> > + ret = -ENOENT;
> > + goto probe_free_host;
> > + }
> > +
> > + ret = mmc_of_parse(mmc);
> > + if (ret)
> > + goto probe_free_host;
> > +
> > + ret = clk_prepare(host->clk);
> > + if (ret)
> > + goto probe_free_host;
> > + ret = clk_enable(host->clk);
> > + if (ret)
> > + goto probe_clk_unprepare;
> > +
> > + spin_lock_init(&host->lock);
> > + mutex_init(&host->mrq_lock);
> > + tasklet_init(&host->tsklet_finish_req, tsklet_func_finish_req,
> (unsigned long)host);
> > + mmc->ops = &spmmc_ops;
> > + mmc->f_min = SPMMC_MIN_CLK;
> > + if (mmc->f_max > SPMMC_MAX_CLK)
> > + mmc->f_max = SPMMC_MAX_CLK;
> > +
> > + mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
> > + mmc->max_seg_size = SPMMC_MAX_BLK_COUNT * 512;
> > + /* Host controller supports up to
> "SPMMC_MAX_DMA_MEMORY_SECTORS"*/
> > + /* a.k.a. max scattered memory segments per request*/
> > + mmc->max_segs = SPMMC_MAX_DMA_MEMORY_SECTORS;
> > + mmc->max_req_size = SPMMC_MAX_BLK_COUNT * 512;
> > + /* Limited by the max value of dma_size & data_length, set it to
> 512 bytes for now */
> > + mmc->max_blk_size = 512;
> > + mmc->max_blk_count = SPMMC_MAX_BLK_COUNT; /* Limited by
> sd_page_num */
> > +
> > + dev_set_drvdata(&pdev->dev, host);
> > + spmmc_controller_init(host);
> > + mode = (int)of_device_get_match_data(&pdev->dev);
> > + spmmc_select_mode(host, mode);
> > + mmc_add_host(mmc);
> > + host->tuning_info.enable_tuning = 1;
> > + pm_runtime_set_active(&pdev->dev);
> > + pm_runtime_enable(&pdev->dev);
> > +
> > + return 0;
> > +
> > +probe_clk_unprepare:
> > + dev_err(&pdev->dev, "unable to enable controller clock\n");
> > + clk_unprepare(host->clk);
> > +probe_free_host:
> > + if (mmc)
> > + mmc_free_host(mmc);
> > +
> > + return ret;
> > +}
> > +
> > +static int spmmc_drv_remove(struct platform_device *dev)
> > +{
> > + struct spmmc_host *host = platform_get_drvdata(dev);
> > +
> > + mmc_remove_host(host->mmc);
> > + clk_disable(host->clk);
> > + clk_unprepare(host->clk);
> > + pm_runtime_disable(&dev->dev);
> > + platform_set_drvdata(dev, NULL);
> > + mmc_free_host(host->mmc);
> > + return 0;
> > +}
> > +
> > +static int spmmc_drv_suspend(struct platform_device *dev, pm_message_t
> state)
> > +{
> > + struct spmmc_host *host;
> > +
> > + host = platform_get_drvdata(dev);
> > + mutex_lock(&host->mrq_lock); /* Make sure that no one is holding
> the controller */
> > + mutex_unlock(&host->mrq_lock);
> > + clk_disable(host->clk);
> > + return 0;
> > +}
> > +
> > +static int spmmc_drv_resume(struct platform_device *dev)
> > +{
> > + struct spmmc_host *host;
> > +
> > + host = platform_get_drvdata(dev);
> > + return clk_enable(host->clk);
> > +}
> > +
> > +#ifdef CONFIG_PM
> > +#ifdef CONFIG_PM_SLEEP
> > +static int spmmc_pm_suspend(struct device *dev)
> > +{
> > + pm_runtime_force_suspend(dev);
> > + return 0;
> > +}
> > +
> > +static int spmmc_pm_resume(struct device *dev)
> > +{
> > + pm_runtime_force_resume(dev);
> > + return 0;
> > +}
> > +#endif /* ifdef CONFIG_PM_SLEEP */
> > +
> > +#ifdef CONFIG_PM_RUNTIME
> > +static int spmmc_pm_runtime_suspend(struct device *dev)
> > +{
> > + struct spmmc_host *host;
> > +
> > + host = dev_get_drvdata(dev);
> > + clk_disable(host->clk);
> > + return 0;
> > +}
> > +
> > +static int spmmc_pm_runtime_resume(struct device *dev)
> > +{
> > + struct spmmc_host *host;
> > +
> > + host = dev_get_drvdata(dev);
> > + return clk_enable(host->clk);
> > +}
> > +#endif /* ifdef CONFIG_PM_RUNTIME */
> > +
> > +static const struct dev_pm_ops spmmc_pm_ops = {
> > + SET_SYSTEM_SLEEP_PM_OPS(spmmc_pm_suspend,
> spmmc_pm_resume)
> > +#ifdef CONFIG_PM_RUNTIME
> > + SET_RUNTIME_PM_OPS(spmmc_pm_runtime_suspend,
> spmmc_pm_runtime_resume, NULL)
> > +#endif
> > +};
> > +#endif /* ifdef CONFIG_PM */
> > +
> > +static const struct of_device_id spmmc_of_table[] = {
> > + {
> > + .compatible = "sunplus,sp7021-emmc",
> > + .data = (void *)SPMMC_MODE_EMMC,
> > + },
> > + {/* sentinel */}
> > +};
> > +MODULE_DEVICE_TABLE(of, spmmc_of_table);
> > +
> > +static struct platform_driver spmmc_driver = {
> > + .probe = spmmc_drv_probe,
> > + .remove = spmmc_drv_remove,
> > + .suspend = spmmc_drv_suspend,
> > + .resume = spmmc_drv_resume,
> > + .driver = {
> > + .name = "spmmc",
> > + .owner = THIS_MODULE,
> > +#ifdef CONFIG_PM
> > + .pm = &spmmc_pm_ops,
> > +#endif
> > + .of_match_table = spmmc_of_table,
> > + },
> > +};
> > +module_platform_driver(spmmc_driver);
> > +
> > +MODULE_AUTHOR("Tony Huang <tonyhuang.sunplus@xxxxxxxxx>");
> > +MODULE_DESCRIPTION("Sunplus MMC controller driver");
> > +MODULE_LICENSE("GPL v2");
> > --
> > 2.7.4
> >
