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linux-next/drivers/mmc/host/mtk-sd.c
Chaotian Jing ae9c657e62 mmc: mediatek: perfer to use rise edge latching 
in our host design, rise edge latching is more stable than fall edge
latching. so that if rise edge has enough margin, no need scan fall edge.

Signed-off-by: Chaotian Jing <chaotian.jing@mediatek.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2016-07-25 10:34:32 +02:00

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/*
* Copyright (c) 2014-2015 MediaTek Inc.
* Author: Chaotian.Jing <chaotian.jing@mediatek.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 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.
*/
#include <linux/module.h>
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/dma-mapping.h>
#include <linux/ioport.h>
#include <linux/irq.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/of_gpio.h>
#include <linux/pinctrl/consumer.h>
#include <linux/platform_device.h>
#include <linux/pm.h>
#include <linux/pm_runtime.h>
#include <linux/regulator/consumer.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/mmc/card.h>
#include <linux/mmc/core.h>
#include <linux/mmc/host.h>
#include <linux/mmc/mmc.h>
#include <linux/mmc/sd.h>
#include <linux/mmc/sdio.h>
#include <linux/mmc/slot-gpio.h>
#define MAX_BD_NUM 1024
/*--------------------------------------------------------------------------*/
/* Common Definition */
/*--------------------------------------------------------------------------*/
#define MSDC_BUS_1BITS 0x0
#define MSDC_BUS_4BITS 0x1
#define MSDC_BUS_8BITS 0x2
#define MSDC_BURST_64B 0x6
/*--------------------------------------------------------------------------*/
/* Register Offset */
/*--------------------------------------------------------------------------*/
#define MSDC_CFG 0x0
#define MSDC_IOCON 0x04
#define MSDC_PS 0x08
#define MSDC_INT 0x0c
#define MSDC_INTEN 0x10
#define MSDC_FIFOCS 0x14
#define SDC_CFG 0x30
#define SDC_CMD 0x34
#define SDC_ARG 0x38
#define SDC_STS 0x3c
#define SDC_RESP0 0x40
#define SDC_RESP1 0x44
#define SDC_RESP2 0x48
#define SDC_RESP3 0x4c
#define SDC_BLK_NUM 0x50
#define EMMC_IOCON 0x7c
#define SDC_ACMD_RESP 0x80
#define MSDC_DMA_SA 0x90
#define MSDC_DMA_CTRL 0x98
#define MSDC_DMA_CFG 0x9c
#define MSDC_PATCH_BIT 0xb0
#define MSDC_PATCH_BIT1 0xb4
#define MSDC_PAD_TUNE 0xec
#define PAD_DS_TUNE 0x188
#define EMMC50_CFG0 0x208
/*--------------------------------------------------------------------------*/
/* Register Mask */
/*--------------------------------------------------------------------------*/
/* MSDC_CFG mask */
#define MSDC_CFG_MODE (0x1 << 0) /* RW */
#define MSDC_CFG_CKPDN (0x1 << 1) /* RW */
#define MSDC_CFG_RST (0x1 << 2) /* RW */
#define MSDC_CFG_PIO (0x1 << 3) /* RW */
#define MSDC_CFG_CKDRVEN (0x1 << 4) /* RW */
#define MSDC_CFG_BV18SDT (0x1 << 5) /* RW */
#define MSDC_CFG_BV18PSS (0x1 << 6) /* R */
#define MSDC_CFG_CKSTB (0x1 << 7) /* R */
#define MSDC_CFG_CKDIV (0xff << 8) /* RW */
#define MSDC_CFG_CKMOD (0x3 << 16) /* RW */
#define MSDC_CFG_HS400_CK_MODE (0x1 << 18) /* RW */
/* MSDC_IOCON mask */
#define MSDC_IOCON_SDR104CKS (0x1 << 0) /* RW */
#define MSDC_IOCON_RSPL (0x1 << 1) /* RW */
#define MSDC_IOCON_DSPL (0x1 << 2) /* RW */
#define MSDC_IOCON_DDLSEL (0x1 << 3) /* RW */
#define MSDC_IOCON_DDR50CKD (0x1 << 4) /* RW */
#define MSDC_IOCON_DSPLSEL (0x1 << 5) /* RW */
#define MSDC_IOCON_W_DSPL (0x1 << 8) /* RW */
#define MSDC_IOCON_D0SPL (0x1 << 16) /* RW */
#define MSDC_IOCON_D1SPL (0x1 << 17) /* RW */
#define MSDC_IOCON_D2SPL (0x1 << 18) /* RW */
#define MSDC_IOCON_D3SPL (0x1 << 19) /* RW */
#define MSDC_IOCON_D4SPL (0x1 << 20) /* RW */
#define MSDC_IOCON_D5SPL (0x1 << 21) /* RW */
#define MSDC_IOCON_D6SPL (0x1 << 22) /* RW */
#define MSDC_IOCON_D7SPL (0x1 << 23) /* RW */
#define MSDC_IOCON_RISCSZ (0x3 << 24) /* RW */
/* MSDC_PS mask */
#define MSDC_PS_CDEN (0x1 << 0) /* RW */
#define MSDC_PS_CDSTS (0x1 << 1) /* R */
#define MSDC_PS_CDDEBOUNCE (0xf << 12) /* RW */
#define MSDC_PS_DAT (0xff << 16) /* R */
#define MSDC_PS_CMD (0x1 << 24) /* R */
#define MSDC_PS_WP (0x1 << 31) /* R */
/* MSDC_INT mask */
#define MSDC_INT_MMCIRQ (0x1 << 0) /* W1C */
#define MSDC_INT_CDSC (0x1 << 1) /* W1C */
#define MSDC_INT_ACMDRDY (0x1 << 3) /* W1C */
#define MSDC_INT_ACMDTMO (0x1 << 4) /* W1C */
#define MSDC_INT_ACMDCRCERR (0x1 << 5) /* W1C */
#define MSDC_INT_DMAQ_EMPTY (0x1 << 6) /* W1C */
#define MSDC_INT_SDIOIRQ (0x1 << 7) /* W1C */
#define MSDC_INT_CMDRDY (0x1 << 8) /* W1C */
#define MSDC_INT_CMDTMO (0x1 << 9) /* W1C */
#define MSDC_INT_RSPCRCERR (0x1 << 10) /* W1C */
#define MSDC_INT_CSTA (0x1 << 11) /* R */
#define MSDC_INT_XFER_COMPL (0x1 << 12) /* W1C */
#define MSDC_INT_DXFER_DONE (0x1 << 13) /* W1C */
#define MSDC_INT_DATTMO (0x1 << 14) /* W1C */
#define MSDC_INT_DATCRCERR (0x1 << 15) /* W1C */
#define MSDC_INT_ACMD19_DONE (0x1 << 16) /* W1C */
#define MSDC_INT_DMA_BDCSERR (0x1 << 17) /* W1C */
#define MSDC_INT_DMA_GPDCSERR (0x1 << 18) /* W1C */
#define MSDC_INT_DMA_PROTECT (0x1 << 19) /* W1C */
/* MSDC_INTEN mask */
#define MSDC_INTEN_MMCIRQ (0x1 << 0) /* RW */
#define MSDC_INTEN_CDSC (0x1 << 1) /* RW */
#define MSDC_INTEN_ACMDRDY (0x1 << 3) /* RW */
#define MSDC_INTEN_ACMDTMO (0x1 << 4) /* RW */
#define MSDC_INTEN_ACMDCRCERR (0x1 << 5) /* RW */
#define MSDC_INTEN_DMAQ_EMPTY (0x1 << 6) /* RW */
#define MSDC_INTEN_SDIOIRQ (0x1 << 7) /* RW */
#define MSDC_INTEN_CMDRDY (0x1 << 8) /* RW */
#define MSDC_INTEN_CMDTMO (0x1 << 9) /* RW */
#define MSDC_INTEN_RSPCRCERR (0x1 << 10) /* RW */
#define MSDC_INTEN_CSTA (0x1 << 11) /* RW */
#define MSDC_INTEN_XFER_COMPL (0x1 << 12) /* RW */
#define MSDC_INTEN_DXFER_DONE (0x1 << 13) /* RW */
#define MSDC_INTEN_DATTMO (0x1 << 14) /* RW */
#define MSDC_INTEN_DATCRCERR (0x1 << 15) /* RW */
#define MSDC_INTEN_ACMD19_DONE (0x1 << 16) /* RW */
#define MSDC_INTEN_DMA_BDCSERR (0x1 << 17) /* RW */
#define MSDC_INTEN_DMA_GPDCSERR (0x1 << 18) /* RW */
#define MSDC_INTEN_DMA_PROTECT (0x1 << 19) /* RW */
/* MSDC_FIFOCS mask */
#define MSDC_FIFOCS_RXCNT (0xff << 0) /* R */
#define MSDC_FIFOCS_TXCNT (0xff << 16) /* R */
#define MSDC_FIFOCS_CLR (0x1 << 31) /* RW */
/* SDC_CFG mask */
#define SDC_CFG_SDIOINTWKUP (0x1 << 0) /* RW */
#define SDC_CFG_INSWKUP (0x1 << 1) /* RW */
#define SDC_CFG_BUSWIDTH (0x3 << 16) /* RW */
#define SDC_CFG_SDIO (0x1 << 19) /* RW */
#define SDC_CFG_SDIOIDE (0x1 << 20) /* RW */
#define SDC_CFG_INTATGAP (0x1 << 21) /* RW */
#define SDC_CFG_DTOC (0xff << 24) /* RW */
/* SDC_STS mask */
#define SDC_STS_SDCBUSY (0x1 << 0) /* RW */
#define SDC_STS_CMDBUSY (0x1 << 1) /* RW */
#define SDC_STS_SWR_COMPL (0x1 << 31) /* RW */
/* MSDC_DMA_CTRL mask */
#define MSDC_DMA_CTRL_START (0x1 << 0) /* W */
#define MSDC_DMA_CTRL_STOP (0x1 << 1) /* W */
#define MSDC_DMA_CTRL_RESUME (0x1 << 2) /* W */
#define MSDC_DMA_CTRL_MODE (0x1 << 8) /* RW */
#define MSDC_DMA_CTRL_LASTBUF (0x1 << 10) /* RW */
#define MSDC_DMA_CTRL_BRUSTSZ (0x7 << 12) /* RW */
/* MSDC_DMA_CFG mask */
#define MSDC_DMA_CFG_STS (0x1 << 0) /* R */
#define MSDC_DMA_CFG_DECSEN (0x1 << 1) /* RW */
#define MSDC_DMA_CFG_AHBHPROT2 (0x2 << 8) /* RW */
#define MSDC_DMA_CFG_ACTIVEEN (0x2 << 12) /* RW */
#define MSDC_DMA_CFG_CS12B16B (0x1 << 16) /* RW */
/* MSDC_PATCH_BIT mask */
#define MSDC_PATCH_BIT_ODDSUPP (0x1 << 1) /* RW */
#define MSDC_INT_DAT_LATCH_CK_SEL (0x7 << 7)
#define MSDC_CKGEN_MSDC_DLY_SEL (0x1f << 10)
#define MSDC_PATCH_BIT_IODSSEL (0x1 << 16) /* RW */
#define MSDC_PATCH_BIT_IOINTSEL (0x1 << 17) /* RW */
#define MSDC_PATCH_BIT_BUSYDLY (0xf << 18) /* RW */
#define MSDC_PATCH_BIT_WDOD (0xf << 22) /* RW */
#define MSDC_PATCH_BIT_IDRTSEL (0x1 << 26) /* RW */
#define MSDC_PATCH_BIT_CMDFSEL (0x1 << 27) /* RW */
#define MSDC_PATCH_BIT_INTDLSEL (0x1 << 28) /* RW */
#define MSDC_PATCH_BIT_SPCPUSH (0x1 << 29) /* RW */
#define MSDC_PATCH_BIT_DECRCTMO (0x1 << 30) /* RW */
#define MSDC_PAD_TUNE_DATRRDLY (0x1f << 8) /* RW */
#define MSDC_PAD_TUNE_CMDRDLY (0x1f << 16) /* RW */
#define PAD_DS_TUNE_DLY1 (0x1f << 2) /* RW */
#define PAD_DS_TUNE_DLY2 (0x1f << 7) /* RW */
#define PAD_DS_TUNE_DLY3 (0x1f << 12) /* RW */
#define EMMC50_CFG_PADCMD_LATCHCK (0x1 << 0) /* RW */
#define EMMC50_CFG_CRCSTS_EDGE (0x1 << 3) /* RW */
#define EMMC50_CFG_CFCSTS_SEL (0x1 << 4) /* RW */
#define REQ_CMD_EIO (0x1 << 0)
#define REQ_CMD_TMO (0x1 << 1)
#define REQ_DAT_ERR (0x1 << 2)
#define REQ_STOP_EIO (0x1 << 3)
#define REQ_STOP_TMO (0x1 << 4)
#define REQ_CMD_BUSY (0x1 << 5)
#define MSDC_PREPARE_FLAG (0x1 << 0)
#define MSDC_ASYNC_FLAG (0x1 << 1)
#define MSDC_MMAP_FLAG (0x1 << 2)
#define MTK_MMC_AUTOSUSPEND_DELAY 50
#define CMD_TIMEOUT (HZ/10 * 5) /* 100ms x5 */
#define DAT_TIMEOUT (HZ * 5) /* 1000ms x5 */
#define PAD_DELAY_MAX 32 /* PAD delay cells */
/*--------------------------------------------------------------------------*/
/* Descriptor Structure */
/*--------------------------------------------------------------------------*/
struct mt_gpdma_desc {
u32 gpd_info;
#define GPDMA_DESC_HWO (0x1 << 0)
#define GPDMA_DESC_BDP (0x1 << 1)
#define GPDMA_DESC_CHECKSUM (0xff << 8) /* bit8 ~ bit15 */
#define GPDMA_DESC_INT (0x1 << 16)
u32 next;
u32 ptr;
u32 gpd_data_len;
#define GPDMA_DESC_BUFLEN (0xffff) /* bit0 ~ bit15 */
#define GPDMA_DESC_EXTLEN (0xff << 16) /* bit16 ~ bit23 */
u32 arg;
u32 blknum;
u32 cmd;
};
struct mt_bdma_desc {
u32 bd_info;
#define BDMA_DESC_EOL (0x1 << 0)
#define BDMA_DESC_CHECKSUM (0xff << 8) /* bit8 ~ bit15 */
#define BDMA_DESC_BLKPAD (0x1 << 17)
#define BDMA_DESC_DWPAD (0x1 << 18)
u32 next;
u32 ptr;
u32 bd_data_len;
#define BDMA_DESC_BUFLEN (0xffff) /* bit0 ~ bit15 */
};
struct msdc_dma {
struct scatterlist *sg; /* I/O scatter list */
struct mt_gpdma_desc *gpd; /* pointer to gpd array */
struct mt_bdma_desc *bd; /* pointer to bd array */
dma_addr_t gpd_addr; /* the physical address of gpd array */
dma_addr_t bd_addr; /* the physical address of bd array */
};
struct msdc_save_para {
u32 msdc_cfg;
u32 iocon;
u32 sdc_cfg;
u32 pad_tune;
u32 patch_bit0;
u32 patch_bit1;
u32 pad_ds_tune;
u32 emmc50_cfg0;
};
struct msdc_tune_para {
u32 iocon;
u32 pad_tune;
};
struct msdc_delay_phase {
u8 maxlen;
u8 start;
u8 final_phase;
};
struct msdc_host {
struct device *dev;
struct mmc_host *mmc; /* mmc structure */
int cmd_rsp;
spinlock_t lock;
struct mmc_request *mrq;
struct mmc_command *cmd;
struct mmc_data *data;
int error;
void __iomem *base; /* host base address */
struct msdc_dma dma; /* dma channel */
u64 dma_mask;
u32 timeout_ns; /* data timeout ns */
u32 timeout_clks; /* data timeout clks */
struct pinctrl *pinctrl;
struct pinctrl_state *pins_default;
struct pinctrl_state *pins_uhs;
struct delayed_work req_timeout;
int irq; /* host interrupt */
struct clk *src_clk; /* msdc source clock */
struct clk *h_clk; /* msdc h_clk */
u32 mclk; /* mmc subsystem clock frequency */
u32 src_clk_freq; /* source clock frequency */
u32 sclk; /* SD/MS bus clock frequency */
unsigned char timing;
bool vqmmc_enabled;
u32 hs400_ds_delay;
bool hs400_mode; /* current eMMC will run at hs400 mode */
struct msdc_save_para save_para; /* used when gate HCLK */
struct msdc_tune_para def_tune_para; /* default tune setting */
struct msdc_tune_para saved_tune_para; /* tune result of CMD21/CMD19 */
};
static void sdr_set_bits(void __iomem *reg, u32 bs)
{
u32 val = readl(reg);
val |= bs;
writel(val, reg);
}
static void sdr_clr_bits(void __iomem *reg, u32 bs)
{
u32 val = readl(reg);
val &= ~bs;
writel(val, reg);
}
static void sdr_set_field(void __iomem *reg, u32 field, u32 val)
{
unsigned int tv = readl(reg);
tv &= ~field;
tv |= ((val) << (ffs((unsigned int)field) - 1));
writel(tv, reg);
}
static void sdr_get_field(void __iomem *reg, u32 field, u32 *val)
{
unsigned int tv = readl(reg);
*val = ((tv & field) >> (ffs((unsigned int)field) - 1));
}
static void msdc_reset_hw(struct msdc_host *host)
{
u32 val;
sdr_set_bits(host->base + MSDC_CFG, MSDC_CFG_RST);
while (readl(host->base + MSDC_CFG) & MSDC_CFG_RST)
cpu_relax();
sdr_set_bits(host->base + MSDC_FIFOCS, MSDC_FIFOCS_CLR);
while (readl(host->base + MSDC_FIFOCS) & MSDC_FIFOCS_CLR)
cpu_relax();
val = readl(host->base + MSDC_INT);
writel(val, host->base + MSDC_INT);
}
static void msdc_cmd_next(struct msdc_host *host,
struct mmc_request *mrq, struct mmc_command *cmd);
static const u32 cmd_ints_mask = MSDC_INTEN_CMDRDY | MSDC_INTEN_RSPCRCERR |
MSDC_INTEN_CMDTMO | MSDC_INTEN_ACMDRDY |
MSDC_INTEN_ACMDCRCERR | MSDC_INTEN_ACMDTMO;
static const u32 data_ints_mask = MSDC_INTEN_XFER_COMPL | MSDC_INTEN_DATTMO |
MSDC_INTEN_DATCRCERR | MSDC_INTEN_DMA_BDCSERR |
MSDC_INTEN_DMA_GPDCSERR | MSDC_INTEN_DMA_PROTECT;
static u8 msdc_dma_calcs(u8 *buf, u32 len)
{
u32 i, sum = 0;
for (i = 0; i < len; i++)
sum += buf[i];
return 0xff - (u8) sum;
}
static inline void msdc_dma_setup(struct msdc_host *host, struct msdc_dma *dma,
struct mmc_data *data)
{
unsigned int j, dma_len;
dma_addr_t dma_address;
u32 dma_ctrl;
struct scatterlist *sg;
struct mt_gpdma_desc *gpd;
struct mt_bdma_desc *bd;
sg = data->sg;
gpd = dma->gpd;
bd = dma->bd;
/* modify gpd */
gpd->gpd_info |= GPDMA_DESC_HWO;
gpd->gpd_info |= GPDMA_DESC_BDP;
/* need to clear first. use these bits to calc checksum */
gpd->gpd_info &= ~GPDMA_DESC_CHECKSUM;
gpd->gpd_info |= msdc_dma_calcs((u8 *) gpd, 16) << 8;
/* modify bd */
for_each_sg(data->sg, sg, data->sg_count, j) {
dma_address = sg_dma_address(sg);
dma_len = sg_dma_len(sg);
/* init bd */
bd[j].bd_info &= ~BDMA_DESC_BLKPAD;
bd[j].bd_info &= ~BDMA_DESC_DWPAD;
bd[j].ptr = (u32)dma_address;
bd[j].bd_data_len &= ~BDMA_DESC_BUFLEN;
bd[j].bd_data_len |= (dma_len & BDMA_DESC_BUFLEN);
if (j == data->sg_count - 1) /* the last bd */
bd[j].bd_info |= BDMA_DESC_EOL;
else
bd[j].bd_info &= ~BDMA_DESC_EOL;
/* checksume need to clear first */
bd[j].bd_info &= ~BDMA_DESC_CHECKSUM;
bd[j].bd_info |= msdc_dma_calcs((u8 *)(&bd[j]), 16) << 8;
}
sdr_set_field(host->base + MSDC_DMA_CFG, MSDC_DMA_CFG_DECSEN, 1);
dma_ctrl = readl_relaxed(host->base + MSDC_DMA_CTRL);
dma_ctrl &= ~(MSDC_DMA_CTRL_BRUSTSZ | MSDC_DMA_CTRL_MODE);
dma_ctrl |= (MSDC_BURST_64B << 12 | 1 << 8);
writel_relaxed(dma_ctrl, host->base + MSDC_DMA_CTRL);
writel((u32)dma->gpd_addr, host->base + MSDC_DMA_SA);
}
static void msdc_prepare_data(struct msdc_host *host, struct mmc_request *mrq)
{
struct mmc_data *data = mrq->data;
if (!(data->host_cookie & MSDC_PREPARE_FLAG)) {
bool read = (data->flags & MMC_DATA_READ) != 0;
data->host_cookie |= MSDC_PREPARE_FLAG;
data->sg_count = dma_map_sg(host->dev, data->sg, data->sg_len,
read ? DMA_FROM_DEVICE : DMA_TO_DEVICE);
}
}
static void msdc_unprepare_data(struct msdc_host *host, struct mmc_request *mrq)
{
struct mmc_data *data = mrq->data;
if (data->host_cookie & MSDC_ASYNC_FLAG)
return;
if (data->host_cookie & MSDC_PREPARE_FLAG) {
bool read = (data->flags & MMC_DATA_READ) != 0;
dma_unmap_sg(host->dev, data->sg, data->sg_len,
read ? DMA_FROM_DEVICE : DMA_TO_DEVICE);
data->host_cookie &= ~MSDC_PREPARE_FLAG;
}
}
/* clock control primitives */
static void msdc_set_timeout(struct msdc_host *host, u32 ns, u32 clks)
{
u32 timeout, clk_ns;
u32 mode = 0;
host->timeout_ns = ns;
host->timeout_clks = clks;
if (host->sclk == 0) {
timeout = 0;
} else {
clk_ns = 1000000000UL / host->sclk;
timeout = (ns + clk_ns - 1) / clk_ns + clks;
/* in 1048576 sclk cycle unit */
timeout = (timeout + (0x1 << 20) - 1) >> 20;
sdr_get_field(host->base + MSDC_CFG, MSDC_CFG_CKMOD, &mode);
/*DDR mode will double the clk cycles for data timeout */
timeout = mode >= 2 ? timeout * 2 : timeout;
timeout = timeout > 1 ? timeout - 1 : 0;
timeout = timeout > 255 ? 255 : timeout;
}
sdr_set_field(host->base + SDC_CFG, SDC_CFG_DTOC, timeout);
}
static void msdc_gate_clock(struct msdc_host *host)
{
clk_disable_unprepare(host->src_clk);
clk_disable_unprepare(host->h_clk);
}
static void msdc_ungate_clock(struct msdc_host *host)
{
clk_prepare_enable(host->h_clk);
clk_prepare_enable(host->src_clk);
while (!(readl(host->base + MSDC_CFG) & MSDC_CFG_CKSTB))
cpu_relax();
}
static void msdc_set_mclk(struct msdc_host *host, unsigned char timing, u32 hz)
{
u32 mode;
u32 flags;
u32 div;
u32 sclk;
if (!hz) {
dev_dbg(host->dev, "set mclk to 0\n");
host->mclk = 0;
sdr_clr_bits(host->base + MSDC_CFG, MSDC_CFG_CKPDN);
return;
}
flags = readl(host->base + MSDC_INTEN);
sdr_clr_bits(host->base + MSDC_INTEN, flags);
sdr_clr_bits(host->base + MSDC_CFG, MSDC_CFG_HS400_CK_MODE);
if (timing == MMC_TIMING_UHS_DDR50 ||
timing == MMC_TIMING_MMC_DDR52 ||
timing == MMC_TIMING_MMC_HS400) {
if (timing == MMC_TIMING_MMC_HS400)
mode = 0x3;
else
mode = 0x2; /* ddr mode and use divisor */
if (hz >= (host->src_clk_freq >> 2)) {
div = 0; /* mean div = 1/4 */
sclk = host->src_clk_freq >> 2; /* sclk = clk / 4 */
} else {
div = (host->src_clk_freq + ((hz << 2) - 1)) / (hz << 2);
sclk = (host->src_clk_freq >> 2) / div;
div = (div >> 1);
}
if (timing == MMC_TIMING_MMC_HS400 &&
hz >= (host->src_clk_freq >> 1)) {
sdr_set_bits(host->base + MSDC_CFG,
MSDC_CFG_HS400_CK_MODE);
sclk = host->src_clk_freq >> 1;
div = 0; /* div is ignore when bit18 is set */
}
} else if (hz >= host->src_clk_freq) {
mode = 0x1; /* no divisor */
div = 0;
sclk = host->src_clk_freq;
} else {
mode = 0x0; /* use divisor */
if (hz >= (host->src_clk_freq >> 1)) {
div = 0; /* mean div = 1/2 */
sclk = host->src_clk_freq >> 1; /* sclk = clk / 2 */
} else {
div = (host->src_clk_freq + ((hz << 2) - 1)) / (hz << 2);
sclk = (host->src_clk_freq >> 2) / div;
}
}
sdr_set_field(host->base + MSDC_CFG, MSDC_CFG_CKMOD | MSDC_CFG_CKDIV,
(mode << 8) | (div % 0xff));
sdr_set_bits(host->base + MSDC_CFG, MSDC_CFG_CKPDN);
while (!(readl(host->base + MSDC_CFG) & MSDC_CFG_CKSTB))
cpu_relax();
host->sclk = sclk;
host->mclk = hz;
host->timing = timing;
/* need because clk changed. */
msdc_set_timeout(host, host->timeout_ns, host->timeout_clks);
sdr_set_bits(host->base + MSDC_INTEN, flags);
/*
* mmc_select_hs400() will drop to 50Mhz and High speed mode,
* tune result of hs200/200Mhz is not suitable for 50Mhz
*/
if (host->sclk <= 52000000) {
writel(host->def_tune_para.iocon, host->base + MSDC_IOCON);
writel(host->def_tune_para.pad_tune, host->base + MSDC_PAD_TUNE);
} else {
writel(host->saved_tune_para.iocon, host->base + MSDC_IOCON);
writel(host->saved_tune_para.pad_tune, host->base + MSDC_PAD_TUNE);
}
dev_dbg(host->dev, "sclk: %d, timing: %d\n", host->sclk, timing);
}
static inline u32 msdc_cmd_find_resp(struct msdc_host *host,
struct mmc_request *mrq, struct mmc_command *cmd)
{
u32 resp;
switch (mmc_resp_type(cmd)) {
/* Actually, R1, R5, R6, R7 are the same */
case MMC_RSP_R1:
resp = 0x1;
break;
case MMC_RSP_R1B:
resp = 0x7;
break;
case MMC_RSP_R2:
resp = 0x2;
break;
case MMC_RSP_R3:
resp = 0x3;
break;
case MMC_RSP_NONE:
default:
resp = 0x0;
break;
}
return resp;
}
static inline u32 msdc_cmd_prepare_raw_cmd(struct msdc_host *host,
struct mmc_request *mrq, struct mmc_command *cmd)
{
/* rawcmd :
* vol_swt << 30 | auto_cmd << 28 | blklen << 16 | go_irq << 15 |
* stop << 14 | rw << 13 | dtype << 11 | rsptyp << 7 | brk << 6 | opcode
*/
u32 opcode = cmd->opcode;
u32 resp = msdc_cmd_find_resp(host, mrq, cmd);
u32 rawcmd = (opcode & 0x3f) | ((resp & 0x7) << 7);
host->cmd_rsp = resp;
if ((opcode == SD_IO_RW_DIRECT && cmd->flags == (unsigned int) -1) ||
opcode == MMC_STOP_TRANSMISSION)
rawcmd |= (0x1 << 14);
else if (opcode == SD_SWITCH_VOLTAGE)
rawcmd |= (0x1 << 30);
else if (opcode == SD_APP_SEND_SCR ||
opcode == SD_APP_SEND_NUM_WR_BLKS ||
(opcode == SD_SWITCH && mmc_cmd_type(cmd) == MMC_CMD_ADTC) ||
(opcode == SD_APP_SD_STATUS && mmc_cmd_type(cmd) == MMC_CMD_ADTC) ||
(opcode == MMC_SEND_EXT_CSD && mmc_cmd_type(cmd) == MMC_CMD_ADTC))
rawcmd |= (0x1 << 11);
if (cmd->data) {
struct mmc_data *data = cmd->data;
if (mmc_op_multi(opcode)) {
if (mmc_card_mmc(host->mmc->card) && mrq->sbc &&
!(mrq->sbc->arg & 0xFFFF0000))
rawcmd |= 0x2 << 28; /* AutoCMD23 */
}
rawcmd |= ((data->blksz & 0xFFF) << 16);
if (data->flags & MMC_DATA_WRITE)
rawcmd |= (0x1 << 13);
if (data->blocks > 1)
rawcmd |= (0x2 << 11);
else
rawcmd |= (0x1 << 11);
/* Always use dma mode */
sdr_clr_bits(host->base + MSDC_CFG, MSDC_CFG_PIO);
if (host->timeout_ns != data->timeout_ns ||
host->timeout_clks != data->timeout_clks)
msdc_set_timeout(host, data->timeout_ns,
data->timeout_clks);
writel(data->blocks, host->base + SDC_BLK_NUM);
}
return rawcmd;
}
static void msdc_start_data(struct msdc_host *host, struct mmc_request *mrq,
struct mmc_command *cmd, struct mmc_data *data)
{
bool read;
WARN_ON(host->data);
host->data = data;
read = data->flags & MMC_DATA_READ;
mod_delayed_work(system_wq, &host->req_timeout, DAT_TIMEOUT);
msdc_dma_setup(host, &host->dma, data);
sdr_set_bits(host->base + MSDC_INTEN, data_ints_mask);
sdr_set_field(host->base + MSDC_DMA_CTRL, MSDC_DMA_CTRL_START, 1);
dev_dbg(host->dev, "DMA start\n");
dev_dbg(host->dev, "%s: cmd=%d DMA data: %d blocks; read=%d\n",
__func__, cmd->opcode, data->blocks, read);
}
static int msdc_auto_cmd_done(struct msdc_host *host, int events,
struct mmc_command *cmd)
{
u32 *rsp = cmd->resp;
rsp[0] = readl(host->base + SDC_ACMD_RESP);
if (events & MSDC_INT_ACMDRDY) {
cmd->error = 0;
} else {
msdc_reset_hw(host);
if (events & MSDC_INT_ACMDCRCERR) {
cmd->error = -EILSEQ;
host->error |= REQ_STOP_EIO;
} else if (events & MSDC_INT_ACMDTMO) {
cmd->error = -ETIMEDOUT;
host->error |= REQ_STOP_TMO;
}
dev_err(host->dev,
"%s: AUTO_CMD%d arg=%08X; rsp %08X; cmd_error=%d\n",
__func__, cmd->opcode, cmd->arg, rsp[0], cmd->error);
}
return cmd->error;
}
static void msdc_track_cmd_data(struct msdc_host *host,
struct mmc_command *cmd, struct mmc_data *data)
{
if (host->error)
dev_dbg(host->dev, "%s: cmd=%d arg=%08X; host->error=0x%08X\n",
__func__, cmd->opcode, cmd->arg, host->error);
}
static void msdc_request_done(struct msdc_host *host, struct mmc_request *mrq)
{
unsigned long flags;
bool ret;
ret = cancel_delayed_work(&host->req_timeout);
if (!ret) {
/* delay work already running */
return;
}
spin_lock_irqsave(&host->lock, flags);
host->mrq = NULL;
spin_unlock_irqrestore(&host->lock, flags);
msdc_track_cmd_data(host, mrq->cmd, mrq->data);
if (mrq->data)
msdc_unprepare_data(host, mrq);
mmc_request_done(host->mmc, mrq);
}
/* returns true if command is fully handled; returns false otherwise */
static bool msdc_cmd_done(struct msdc_host *host, int events,
struct mmc_request *mrq, struct mmc_command *cmd)
{
bool done = false;
bool sbc_error;
unsigned long flags;
u32 *rsp = cmd->resp;
if (mrq->sbc && cmd == mrq->cmd &&
(events & (MSDC_INT_ACMDRDY | MSDC_INT_ACMDCRCERR
| MSDC_INT_ACMDTMO)))
msdc_auto_cmd_done(host, events, mrq->sbc);
sbc_error = mrq->sbc && mrq->sbc->error;
if (!sbc_error && !(events & (MSDC_INT_CMDRDY
| MSDC_INT_RSPCRCERR
| MSDC_INT_CMDTMO)))
return done;
spin_lock_irqsave(&host->lock, flags);
done = !host->cmd;
host->cmd = NULL;
spin_unlock_irqrestore(&host->lock, flags);
if (done)
return true;
sdr_clr_bits(host->base + MSDC_INTEN, cmd_ints_mask);
if (cmd->flags & MMC_RSP_PRESENT) {
if (cmd->flags & MMC_RSP_136) {
rsp[0] = readl(host->base + SDC_RESP3);
rsp[1] = readl(host->base + SDC_RESP2);
rsp[2] = readl(host->base + SDC_RESP1);
rsp[3] = readl(host->base + SDC_RESP0);
} else {
rsp[0] = readl(host->base + SDC_RESP0);
}
}
if (!sbc_error && !(events & MSDC_INT_CMDRDY)) {
if (cmd->opcode != MMC_SEND_TUNING_BLOCK &&
cmd->opcode != MMC_SEND_TUNING_BLOCK_HS200)
/*
* should not clear fifo/interrupt as the tune data
* may have alreay come.
*/
msdc_reset_hw(host);
if (events & MSDC_INT_RSPCRCERR) {
cmd->error = -EILSEQ;
host->error |= REQ_CMD_EIO;
} else if (events & MSDC_INT_CMDTMO) {
cmd->error = -ETIMEDOUT;
host->error |= REQ_CMD_TMO;
}
}
if (cmd->error)
dev_dbg(host->dev,
"%s: cmd=%d arg=%08X; rsp %08X; cmd_error=%d\n",
__func__, cmd->opcode, cmd->arg, rsp[0],
cmd->error);
msdc_cmd_next(host, mrq, cmd);
return true;
}
/* It is the core layer's responsibility to ensure card status
* is correct before issue a request. but host design do below
* checks recommended.
*/
static inline bool msdc_cmd_is_ready(struct msdc_host *host,
struct mmc_request *mrq, struct mmc_command *cmd)
{
/* The max busy time we can endure is 20ms */
unsigned long tmo = jiffies + msecs_to_jiffies(20);
while ((readl(host->base + SDC_STS) & SDC_STS_CMDBUSY) &&
time_before(jiffies, tmo))
cpu_relax();
if (readl(host->base + SDC_STS) & SDC_STS_CMDBUSY) {
dev_err(host->dev, "CMD bus busy detected\n");
host->error |= REQ_CMD_BUSY;
msdc_cmd_done(host, MSDC_INT_CMDTMO, mrq, cmd);
return false;
}
if (mmc_resp_type(cmd) == MMC_RSP_R1B || cmd->data) {
tmo = jiffies + msecs_to_jiffies(20);
/* R1B or with data, should check SDCBUSY */
while ((readl(host->base + SDC_STS) & SDC_STS_SDCBUSY) &&
time_before(jiffies, tmo))
cpu_relax();
if (readl(host->base + SDC_STS) & SDC_STS_SDCBUSY) {
dev_err(host->dev, "Controller busy detected\n");
host->error |= REQ_CMD_BUSY;
msdc_cmd_done(host, MSDC_INT_CMDTMO, mrq, cmd);
return false;
}
}
return true;
}
static void msdc_start_command(struct msdc_host *host,
struct mmc_request *mrq, struct mmc_command *cmd)
{
u32 rawcmd;
WARN_ON(host->cmd);
host->cmd = cmd;
if (!msdc_cmd_is_ready(host, mrq, cmd))
return;
if ((readl(host->base + MSDC_FIFOCS) & MSDC_FIFOCS_TXCNT) >> 16 ||
readl(host->base + MSDC_FIFOCS) & MSDC_FIFOCS_RXCNT) {
dev_err(host->dev, "TX/RX FIFO non-empty before start of IO. Reset\n");
msdc_reset_hw(host);
}
cmd->error = 0;
rawcmd = msdc_cmd_prepare_raw_cmd(host, mrq, cmd);
mod_delayed_work(system_wq, &host->req_timeout, DAT_TIMEOUT);
sdr_set_bits(host->base + MSDC_INTEN, cmd_ints_mask);
writel(cmd->arg, host->base + SDC_ARG);
writel(rawcmd, host->base + SDC_CMD);
}
static void msdc_cmd_next(struct msdc_host *host,
struct mmc_request *mrq, struct mmc_command *cmd)
{
if ((cmd->error &&
!(cmd->error == -EILSEQ &&
(cmd->opcode == MMC_SEND_TUNING_BLOCK ||
cmd->opcode == MMC_SEND_TUNING_BLOCK_HS200))) ||
(mrq->sbc && mrq->sbc->error))
msdc_request_done(host, mrq);
else if (cmd == mrq->sbc)
msdc_start_command(host, mrq, mrq->cmd);
else if (!cmd->data)
msdc_request_done(host, mrq);
else
msdc_start_data(host, mrq, cmd, cmd->data);
}
static void msdc_ops_request(struct mmc_host *mmc, struct mmc_request *mrq)
{
struct msdc_host *host = mmc_priv(mmc);
host->error = 0;
WARN_ON(host->mrq);
host->mrq = mrq;
if (mrq->data)
msdc_prepare_data(host, mrq);
/* if SBC is required, we have HW option and SW option.
* if HW option is enabled, and SBC does not have "special" flags,
* use HW option, otherwise use SW option
*/
if (mrq->sbc && (!mmc_card_mmc(mmc->card) ||
(mrq->sbc->arg & 0xFFFF0000)))
msdc_start_command(host, mrq, mrq->sbc);
else
msdc_start_command(host, mrq, mrq->cmd);
}
static void msdc_pre_req(struct mmc_host *mmc, struct mmc_request *mrq,
bool is_first_req)
{
struct msdc_host *host = mmc_priv(mmc);
struct mmc_data *data = mrq->data;
if (!data)
return;
msdc_prepare_data(host, mrq);
data->host_cookie |= MSDC_ASYNC_FLAG;
}
static void msdc_post_req(struct mmc_host *mmc, struct mmc_request *mrq,
int err)
{
struct msdc_host *host = mmc_priv(mmc);
struct mmc_data *data;
data = mrq->data;
if (!data)
return;
if (data->host_cookie) {
data->host_cookie &= ~MSDC_ASYNC_FLAG;
msdc_unprepare_data(host, mrq);
}
}
static void msdc_data_xfer_next(struct msdc_host *host,
struct mmc_request *mrq, struct mmc_data *data)
{
if (mmc_op_multi(mrq->cmd->opcode) && mrq->stop && !mrq->stop->error &&
!mrq->sbc)
msdc_start_command(host, mrq, mrq->stop);
else
msdc_request_done(host, mrq);
}
static bool msdc_data_xfer_done(struct msdc_host *host, u32 events,
struct mmc_request *mrq, struct mmc_data *data)
{
struct mmc_command *stop = data->stop;
unsigned long flags;
bool done;
unsigned int check_data = events &
(MSDC_INT_XFER_COMPL | MSDC_INT_DATCRCERR | MSDC_INT_DATTMO
| MSDC_INT_DMA_BDCSERR | MSDC_INT_DMA_GPDCSERR
| MSDC_INT_DMA_PROTECT);
spin_lock_irqsave(&host->lock, flags);
done = !host->data;
if (check_data)
host->data = NULL;
spin_unlock_irqrestore(&host->lock, flags);
if (done)
return true;
if (check_data || (stop && stop->error)) {
dev_dbg(host->dev, "DMA status: 0x%8X\n",
readl(host->base + MSDC_DMA_CFG));
sdr_set_field(host->base + MSDC_DMA_CTRL, MSDC_DMA_CTRL_STOP,
1);
while (readl(host->base + MSDC_DMA_CFG) & MSDC_DMA_CFG_STS)
cpu_relax();
sdr_clr_bits(host->base + MSDC_INTEN, data_ints_mask);
dev_dbg(host->dev, "DMA stop\n");
if ((events & MSDC_INT_XFER_COMPL) && (!stop || !stop->error)) {
data->bytes_xfered = data->blocks * data->blksz;
} else {
dev_dbg(host->dev, "interrupt events: %x\n", events);
msdc_reset_hw(host);
host->error |= REQ_DAT_ERR;
data->bytes_xfered = 0;
if (events & MSDC_INT_DATTMO)
data->error = -ETIMEDOUT;
else if (events & MSDC_INT_DATCRCERR)
data->error = -EILSEQ;
dev_dbg(host->dev, "%s: cmd=%d; blocks=%d",
__func__, mrq->cmd->opcode, data->blocks);
dev_dbg(host->dev, "data_error=%d xfer_size=%d\n",
(int)data->error, data->bytes_xfered);
}
msdc_data_xfer_next(host, mrq, data);
done = true;
}
return done;
}
static void msdc_set_buswidth(struct msdc_host *host, u32 width)
{
u32 val = readl(host->base + SDC_CFG);
val &= ~SDC_CFG_BUSWIDTH;
switch (width) {
default:
case MMC_BUS_WIDTH_1:
val |= (MSDC_BUS_1BITS << 16);
break;
case MMC_BUS_WIDTH_4:
val |= (MSDC_BUS_4BITS << 16);
break;
case MMC_BUS_WIDTH_8:
val |= (MSDC_BUS_8BITS << 16);
break;
}
writel(val, host->base + SDC_CFG);
dev_dbg(host->dev, "Bus Width = %d", width);
}
static int msdc_ops_switch_volt(struct mmc_host *mmc, struct mmc_ios *ios)
{
struct msdc_host *host = mmc_priv(mmc);
int ret = 0;
if (!IS_ERR(mmc->supply.vqmmc)) {
if (ios->signal_voltage != MMC_SIGNAL_VOLTAGE_330 &&
ios->signal_voltage != MMC_SIGNAL_VOLTAGE_180) {
dev_err(host->dev, "Unsupported signal voltage!\n");
return -EINVAL;
}
ret = mmc_regulator_set_vqmmc(mmc, ios);
if (ret) {
dev_dbg(host->dev, "Regulator set error %d (%d)\n",
ret, ios->signal_voltage);
} else {
/* Apply different pinctrl settings for different signal voltage */
if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_180)
pinctrl_select_state(host->pinctrl, host->pins_uhs);
else
pinctrl_select_state(host->pinctrl, host->pins_default);
}
}
return ret;
}
static int msdc_card_busy(struct mmc_host *mmc)
{
struct msdc_host *host = mmc_priv(mmc);
u32 status = readl(host->base + MSDC_PS);
/* check if any pin between dat[0:3] is low */
if (((status >> 16) & 0xf) != 0xf)
return 1;
return 0;
}
static void msdc_request_timeout(struct work_struct *work)
{
struct msdc_host *host = container_of(work, struct msdc_host,
req_timeout.work);
/* simulate HW timeout status */
dev_err(host->dev, "%s: aborting cmd/data/mrq\n", __func__);
if (host->mrq) {
dev_err(host->dev, "%s: aborting mrq=%p cmd=%d\n", __func__,
host->mrq, host->mrq->cmd->opcode);
if (host->cmd) {
dev_err(host->dev, "%s: aborting cmd=%d\n",
__func__, host->cmd->opcode);
msdc_cmd_done(host, MSDC_INT_CMDTMO, host->mrq,
host->cmd);
} else if (host->data) {
dev_err(host->dev, "%s: abort data: cmd%d; %d blocks\n",
__func__, host->mrq->cmd->opcode,
host->data->blocks);
msdc_data_xfer_done(host, MSDC_INT_DATTMO, host->mrq,
host->data);
}
}
}
static irqreturn_t msdc_irq(int irq, void *dev_id)
{
struct msdc_host *host = (struct msdc_host *) dev_id;
while (true) {
unsigned long flags;
struct mmc_request *mrq;
struct mmc_command *cmd;
struct mmc_data *data;
u32 events, event_mask;
spin_lock_irqsave(&host->lock, flags);
events = readl(host->base + MSDC_INT);
event_mask = readl(host->base + MSDC_INTEN);
/* clear interrupts */
writel(events & event_mask, host->base + MSDC_INT);
mrq = host->mrq;
cmd = host->cmd;
data = host->data;
spin_unlock_irqrestore(&host->lock, flags);
if (!(events & event_mask))
break;
if (!mrq) {
dev_err(host->dev,
"%s: MRQ=NULL; events=%08X; event_mask=%08X\n",
__func__, events, event_mask);
WARN_ON(1);
break;
}
dev_dbg(host->dev, "%s: events=%08X\n", __func__, events);
if (cmd)
msdc_cmd_done(host, events, mrq, cmd);
else if (data)
msdc_data_xfer_done(host, events, mrq, data);
}
return IRQ_HANDLED;
}
static void msdc_init_hw(struct msdc_host *host)
{
u32 val;
/* Configure to MMC/SD mode, clock free running */
sdr_set_bits(host->base + MSDC_CFG, MSDC_CFG_MODE | MSDC_CFG_CKPDN);
/* Reset */
msdc_reset_hw(host);
/* Disable card detection */
sdr_clr_bits(host->base + MSDC_PS, MSDC_PS_CDEN);
/* Disable and clear all interrupts */
writel(0, host->base + MSDC_INTEN);
val = readl(host->base + MSDC_INT);
writel(val, host->base + MSDC_INT);
writel(0, host->base + MSDC_PAD_TUNE);
writel(0, host->base + MSDC_IOCON);
sdr_set_field(host->base + MSDC_IOCON, MSDC_IOCON_DDLSEL, 0);
writel(0x403c0046, host->base + MSDC_PATCH_BIT);
sdr_set_field(host->base + MSDC_PATCH_BIT, MSDC_CKGEN_MSDC_DLY_SEL, 1);
writel(0xffff0089, host->base + MSDC_PATCH_BIT1);
sdr_set_bits(host->base + EMMC50_CFG0, EMMC50_CFG_CFCSTS_SEL);
/* Configure to enable SDIO mode.
* it's must otherwise sdio cmd5 failed
*/
sdr_set_bits(host->base + SDC_CFG, SDC_CFG_SDIO);
/* disable detect SDIO device interrupt function */
sdr_clr_bits(host->base + SDC_CFG, SDC_CFG_SDIOIDE);
/* Configure to default data timeout */
sdr_set_field(host->base + SDC_CFG, SDC_CFG_DTOC, 3);
host->def_tune_para.iocon = readl(host->base + MSDC_IOCON);
host->def_tune_para.pad_tune = readl(host->base + MSDC_PAD_TUNE);
dev_dbg(host->dev, "init hardware done!");
}
static void msdc_deinit_hw(struct msdc_host *host)
{
u32 val;
/* Disable and clear all interrupts */
writel(0, host->base + MSDC_INTEN);
val = readl(host->base + MSDC_INT);
writel(val, host->base + MSDC_INT);
}
/* init gpd and bd list in msdc_drv_probe */
static void msdc_init_gpd_bd(struct msdc_host *host, struct msdc_dma *dma)
{
struct mt_gpdma_desc *gpd = dma->gpd;
struct mt_bdma_desc *bd = dma->bd;
int i;
memset(gpd, 0, sizeof(struct mt_gpdma_desc) * 2);
gpd->gpd_info = GPDMA_DESC_BDP; /* hwo, cs, bd pointer */
gpd->ptr = (u32)dma->bd_addr; /* physical address */
/* gpd->next is must set for desc DMA
* That's why must alloc 2 gpd structure.
*/
gpd->next = (u32)dma->gpd_addr + sizeof(struct mt_gpdma_desc);
memset(bd, 0, sizeof(struct mt_bdma_desc) * MAX_BD_NUM);
for (i = 0; i < (MAX_BD_NUM - 1); i++)
bd[i].next = (u32)dma->bd_addr + sizeof(*bd) * (i + 1);
}
static void msdc_ops_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
{
struct msdc_host *host = mmc_priv(mmc);
int ret;
msdc_set_buswidth(host, ios->bus_width);
/* Suspend/Resume will do power off/on */
switch (ios->power_mode) {
case MMC_POWER_UP:
if (!IS_ERR(mmc->supply.vmmc)) {
msdc_init_hw(host);
ret = mmc_regulator_set_ocr(mmc, mmc->supply.vmmc,
ios->vdd);
if (ret) {
dev_err(host->dev, "Failed to set vmmc power!\n");
return;
}
}
break;
case MMC_POWER_ON:
if (!IS_ERR(mmc->supply.vqmmc) && !host->vqmmc_enabled) {
ret = regulator_enable(mmc->supply.vqmmc);
if (ret)
dev_err(host->dev, "Failed to set vqmmc power!\n");
else
host->vqmmc_enabled = true;
}
break;
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;
default:
break;
}
if (host->mclk != ios->clock || host->timing != ios->timing)
msdc_set_mclk(host, ios->timing, ios->clock);
}
static u32 test_delay_bit(u32 delay, u32 bit)
{
bit %= PAD_DELAY_MAX;
return delay & (1 << bit);
}
static int get_delay_len(u32 delay, u32 start_bit)
{
int i;
for (i = 0; i < (PAD_DELAY_MAX - start_bit); i++) {
if (test_delay_bit(delay, start_bit + i) == 0)
return i;
}
return PAD_DELAY_MAX - start_bit;
}
static struct msdc_delay_phase get_best_delay(struct msdc_host *host, u32 delay)
{
int start = 0, len = 0;
int start_final = 0, len_final = 0;
u8 final_phase = 0xff;
struct msdc_delay_phase delay_phase = { 0, };
if (delay == 0) {
dev_err(host->dev, "phase error: [map:%x]\n", delay);
delay_phase.final_phase = final_phase;
return delay_phase;
}
while (start < PAD_DELAY_MAX) {
len = get_delay_len(delay, start);
if (len_final < len) {
start_final = start;
len_final = len;
}
start += len ? len : 1;
if (len >= 8 && start_final < 4)
break;
}
/* The rule is that to find the smallest delay cell */
if (start_final == 0)
final_phase = (start_final + len_final / 3) % PAD_DELAY_MAX;
else
final_phase = (start_final + len_final / 2) % PAD_DELAY_MAX;
dev_info(host->dev, "phase: [map:%x] [maxlen:%d] [final:%d]\n",
delay, len_final, final_phase);
delay_phase.maxlen = len_final;
delay_phase.start = start_final;
delay_phase.final_phase = final_phase;
return delay_phase;
}
static int msdc_tune_response(struct mmc_host *mmc, u32 opcode)
{
struct msdc_host *host = mmc_priv(mmc);
u32 rise_delay = 0, fall_delay = 0;
struct msdc_delay_phase final_rise_delay, final_fall_delay = { 0,};
u8 final_delay, final_maxlen;
int cmd_err;
int i;
sdr_clr_bits(host->base + MSDC_IOCON, MSDC_IOCON_RSPL);
for (i = 0 ; i < PAD_DELAY_MAX; i++) {
sdr_set_field(host->base + MSDC_PAD_TUNE,
MSDC_PAD_TUNE_CMDRDLY, i);
mmc_send_tuning(mmc, opcode, &cmd_err);
if (!cmd_err)
rise_delay |= (1 << i);
}
final_rise_delay = get_best_delay(host, rise_delay);
/* if rising edge has enough margin, then do not scan falling edge */
if (final_rise_delay.maxlen >= 10 ||
(final_rise_delay.start == 0 && final_rise_delay.maxlen >= 4))
goto skip_fall;
sdr_set_bits(host->base + MSDC_IOCON, MSDC_IOCON_RSPL);
for (i = 0; i < PAD_DELAY_MAX; i++) {
sdr_set_field(host->base + MSDC_PAD_TUNE,
MSDC_PAD_TUNE_CMDRDLY, i);
mmc_send_tuning(mmc, opcode, &cmd_err);
if (!cmd_err)
fall_delay |= (1 << i);
}
final_fall_delay = get_best_delay(host, fall_delay);
skip_fall:
final_maxlen = max(final_rise_delay.maxlen, final_fall_delay.maxlen);
if (final_maxlen == final_rise_delay.maxlen) {
sdr_clr_bits(host->base + MSDC_IOCON, MSDC_IOCON_RSPL);
sdr_set_field(host->base + MSDC_PAD_TUNE, MSDC_PAD_TUNE_CMDRDLY,
final_rise_delay.final_phase);
final_delay = final_rise_delay.final_phase;
} else {
sdr_set_bits(host->base + MSDC_IOCON, MSDC_IOCON_RSPL);
sdr_set_field(host->base + MSDC_PAD_TUNE, MSDC_PAD_TUNE_CMDRDLY,
final_fall_delay.final_phase);
final_delay = final_fall_delay.final_phase;
}
return final_delay == 0xff ? -EIO : 0;
}
static int msdc_tune_data(struct mmc_host *mmc, u32 opcode)
{
struct msdc_host *host = mmc_priv(mmc);
u32 rise_delay = 0, fall_delay = 0;
struct msdc_delay_phase final_rise_delay, final_fall_delay = { 0,};
u8 final_delay, final_maxlen;
int i, ret;
sdr_clr_bits(host->base + MSDC_IOCON, MSDC_IOCON_DSPL);
sdr_clr_bits(host->base + MSDC_IOCON, MSDC_IOCON_W_DSPL);
for (i = 0 ; i < PAD_DELAY_MAX; i++) {
sdr_set_field(host->base + MSDC_PAD_TUNE,
MSDC_PAD_TUNE_DATRRDLY, i);
ret = mmc_send_tuning(mmc, opcode, NULL);
if (!ret)
rise_delay |= (1 << i);
}
final_rise_delay = get_best_delay(host, rise_delay);
/* if rising edge has enough margin, then do not scan falling edge */
if (final_rise_delay.maxlen >= 10 ||
(final_rise_delay.start == 0 && final_rise_delay.maxlen >= 4))
goto skip_fall;
sdr_set_bits(host->base + MSDC_IOCON, MSDC_IOCON_DSPL);
sdr_set_bits(host->base + MSDC_IOCON, MSDC_IOCON_W_DSPL);
for (i = 0; i < PAD_DELAY_MAX; i++) {
sdr_set_field(host->base + MSDC_PAD_TUNE,
MSDC_PAD_TUNE_DATRRDLY, i);
ret = mmc_send_tuning(mmc, opcode, NULL);
if (!ret)
fall_delay |= (1 << i);
}
final_fall_delay = get_best_delay(host, fall_delay);
skip_fall:
final_maxlen = max(final_rise_delay.maxlen, final_fall_delay.maxlen);
if (final_maxlen == final_rise_delay.maxlen) {
sdr_clr_bits(host->base + MSDC_IOCON, MSDC_IOCON_DSPL);
sdr_clr_bits(host->base + MSDC_IOCON, MSDC_IOCON_W_DSPL);
sdr_set_field(host->base + MSDC_PAD_TUNE,
MSDC_PAD_TUNE_DATRRDLY,
final_rise_delay.final_phase);
final_delay = final_rise_delay.final_phase;
} else {
sdr_set_bits(host->base + MSDC_IOCON, MSDC_IOCON_DSPL);
sdr_set_bits(host->base + MSDC_IOCON, MSDC_IOCON_W_DSPL);
sdr_set_field(host->base + MSDC_PAD_TUNE,
MSDC_PAD_TUNE_DATRRDLY,
final_fall_delay.final_phase);
final_delay = final_fall_delay.final_phase;
}
return final_delay == 0xff ? -EIO : 0;
}
static int msdc_execute_tuning(struct mmc_host *mmc, u32 opcode)
{
struct msdc_host *host = mmc_priv(mmc);
int ret;
ret = msdc_tune_response(mmc, opcode);
if (ret == -EIO) {
dev_err(host->dev, "Tune response fail!\n");
return ret;
}
if (host->hs400_mode == false) {
ret = msdc_tune_data(mmc, opcode);
if (ret == -EIO)
dev_err(host->dev, "Tune data fail!\n");
}
host->saved_tune_para.iocon = readl(host->base + MSDC_IOCON);
host->saved_tune_para.pad_tune = readl(host->base + MSDC_PAD_TUNE);
return ret;
}
static int msdc_prepare_hs400_tuning(struct mmc_host *mmc, struct mmc_ios *ios)
{
struct msdc_host *host = mmc_priv(mmc);
host->hs400_mode = true;
writel(host->hs400_ds_delay, host->base + PAD_DS_TUNE);
return 0;
}
static void msdc_hw_reset(struct mmc_host *mmc)
{
struct msdc_host *host = mmc_priv(mmc);
sdr_set_bits(host->base + EMMC_IOCON, 1);
udelay(10); /* 10us is enough */
sdr_clr_bits(host->base + EMMC_IOCON, 1);
}
static struct mmc_host_ops mt_msdc_ops = {
.post_req = msdc_post_req,
.pre_req = msdc_pre_req,
.request = msdc_ops_request,
.set_ios = msdc_ops_set_ios,
.get_ro = mmc_gpio_get_ro,
.start_signal_voltage_switch = msdc_ops_switch_volt,
.card_busy = msdc_card_busy,
.execute_tuning = msdc_execute_tuning,
.prepare_hs400_tuning = msdc_prepare_hs400_tuning,
.hw_reset = msdc_hw_reset,
};
static int msdc_drv_probe(struct platform_device *pdev)
{
struct mmc_host *mmc;
struct msdc_host *host;
struct resource *res;
int ret;
if (!pdev->dev.of_node) {
dev_err(&pdev->dev, "No DT found\n");
return -EINVAL;
}
/* Allocate MMC host for this device */
mmc = mmc_alloc_host(sizeof(struct msdc_host), &pdev->dev);
if (!mmc)
return -ENOMEM;
host = mmc_priv(mmc);
ret = mmc_of_parse(mmc);
if (ret)
goto host_free;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
host->base = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(host->base)) {
ret = PTR_ERR(host->base);
goto host_free;
}
ret = mmc_regulator_get_supply(mmc);
if (ret == -EPROBE_DEFER)
goto host_free;
host->src_clk = devm_clk_get(&pdev->dev, "source");
if (IS_ERR(host->src_clk)) {
ret = PTR_ERR(host->src_clk);
goto host_free;
}
host->h_clk = devm_clk_get(&pdev->dev, "hclk");
if (IS_ERR(host->h_clk)) {
ret = PTR_ERR(host->h_clk);
goto host_free;
}
host->irq = platform_get_irq(pdev, 0);
if (host->irq < 0) {
ret = -EINVAL;
goto host_free;
}
host->pinctrl = devm_pinctrl_get(&pdev->dev);
if (IS_ERR(host->pinctrl)) {
ret = PTR_ERR(host->pinctrl);
dev_err(&pdev->dev, "Cannot find pinctrl!\n");
goto host_free;
}
host->pins_default = pinctrl_lookup_state(host->pinctrl, "default");
if (IS_ERR(host->pins_default)) {
ret = PTR_ERR(host->pins_default);
dev_err(&pdev->dev, "Cannot find pinctrl default!\n");
goto host_free;
}
host->pins_uhs = pinctrl_lookup_state(host->pinctrl, "state_uhs");
if (IS_ERR(host->pins_uhs)) {
ret = PTR_ERR(host->pins_uhs);
dev_err(&pdev->dev, "Cannot find pinctrl uhs!\n");
goto host_free;
}
if (!of_property_read_u32(pdev->dev.of_node, "hs400-ds-delay",
&host->hs400_ds_delay))
dev_dbg(&pdev->dev, "hs400-ds-delay: %x\n",
host->hs400_ds_delay);
host->dev = &pdev->dev;
host->mmc = mmc;
host->src_clk_freq = clk_get_rate(host->src_clk);
/* Set host parameters to mmc */
mmc->ops = &mt_msdc_ops;
mmc->f_min = host->src_clk_freq / (4 * 255);
mmc->caps |= MMC_CAP_ERASE | MMC_CAP_CMD23;
/* MMC core transfer sizes tunable parameters */
mmc->max_segs = MAX_BD_NUM;
mmc->max_seg_size = BDMA_DESC_BUFLEN;
mmc->max_blk_size = 2048;
mmc->max_req_size = 512 * 1024;
mmc->max_blk_count = mmc->max_req_size / 512;
host->dma_mask = DMA_BIT_MASK(32);
mmc_dev(mmc)->dma_mask = &host->dma_mask;
host->timeout_clks = 3 * 1048576;
host->dma.gpd = dma_alloc_coherent(&pdev->dev,
2 * sizeof(struct mt_gpdma_desc),
&host->dma.gpd_addr, GFP_KERNEL);
host->dma.bd = dma_alloc_coherent(&pdev->dev,
MAX_BD_NUM * sizeof(struct mt_bdma_desc),
&host->dma.bd_addr, GFP_KERNEL);
if (!host->dma.gpd || !host->dma.bd) {
ret = -ENOMEM;
goto release_mem;
}
msdc_init_gpd_bd(host, &host->dma);
INIT_DELAYED_WORK(&host->req_timeout, msdc_request_timeout);
spin_lock_init(&host->lock);
platform_set_drvdata(pdev, mmc);
msdc_ungate_clock(host);
msdc_init_hw(host);
ret = devm_request_irq(&pdev->dev, host->irq, msdc_irq,
IRQF_TRIGGER_LOW | IRQF_ONESHOT, pdev->name, host);
if (ret)
goto release;
pm_runtime_set_active(host->dev);
pm_runtime_set_autosuspend_delay(host->dev, MTK_MMC_AUTOSUSPEND_DELAY);
pm_runtime_use_autosuspend(host->dev);
pm_runtime_enable(host->dev);
ret = mmc_add_host(mmc);
if (ret)
goto end;
return 0;
end:
pm_runtime_disable(host->dev);
release:
platform_set_drvdata(pdev, NULL);
msdc_deinit_hw(host);
msdc_gate_clock(host);
release_mem:
if (host->dma.gpd)
dma_free_coherent(&pdev->dev,
2 * sizeof(struct mt_gpdma_desc),
host->dma.gpd, host->dma.gpd_addr);
if (host->dma.bd)
dma_free_coherent(&pdev->dev,
MAX_BD_NUM * sizeof(struct mt_bdma_desc),
host->dma.bd, host->dma.bd_addr);
host_free:
mmc_free_host(mmc);
return ret;
}
static int msdc_drv_remove(struct platform_device *pdev)
{
struct mmc_host *mmc;
struct msdc_host *host;
mmc = platform_get_drvdata(pdev);
host = mmc_priv(mmc);
pm_runtime_get_sync(host->dev);
platform_set_drvdata(pdev, NULL);
mmc_remove_host(host->mmc);
msdc_deinit_hw(host);
msdc_gate_clock(host);
pm_runtime_disable(host->dev);
pm_runtime_put_noidle(host->dev);
dma_free_coherent(&pdev->dev,
sizeof(struct mt_gpdma_desc),
host->dma.gpd, host->dma.gpd_addr);
dma_free_coherent(&pdev->dev, MAX_BD_NUM * sizeof(struct mt_bdma_desc),
host->dma.bd, host->dma.bd_addr);
mmc_free_host(host->mmc);
return 0;
}
#ifdef CONFIG_PM
static void msdc_save_reg(struct msdc_host *host)
{
host->save_para.msdc_cfg = readl(host->base + MSDC_CFG);
host->save_para.iocon = readl(host->base + MSDC_IOCON);
host->save_para.sdc_cfg = readl(host->base + SDC_CFG);
host->save_para.pad_tune = readl(host->base + MSDC_PAD_TUNE);
host->save_para.patch_bit0 = readl(host->base + MSDC_PATCH_BIT);
host->save_para.patch_bit1 = readl(host->base + MSDC_PATCH_BIT1);
host->save_para.pad_ds_tune = readl(host->base + PAD_DS_TUNE);
host->save_para.emmc50_cfg0 = readl(host->base + EMMC50_CFG0);
}
static void msdc_restore_reg(struct msdc_host *host)
{
writel(host->save_para.msdc_cfg, host->base + MSDC_CFG);
writel(host->save_para.iocon, host->base + MSDC_IOCON);
writel(host->save_para.sdc_cfg, host->base + SDC_CFG);
writel(host->save_para.pad_tune, host->base + MSDC_PAD_TUNE);
writel(host->save_para.patch_bit0, host->base + MSDC_PATCH_BIT);
writel(host->save_para.patch_bit1, host->base + MSDC_PATCH_BIT1);
writel(host->save_para.pad_ds_tune, host->base + PAD_DS_TUNE);
writel(host->save_para.emmc50_cfg0, host->base + EMMC50_CFG0);
}
static int msdc_runtime_suspend(struct device *dev)
{
struct mmc_host *mmc = dev_get_drvdata(dev);
struct msdc_host *host = mmc_priv(mmc);
msdc_save_reg(host);
msdc_gate_clock(host);
return 0;
}
static int msdc_runtime_resume(struct device *dev)
{
struct mmc_host *mmc = dev_get_drvdata(dev);
struct msdc_host *host = mmc_priv(mmc);
msdc_ungate_clock(host);
msdc_restore_reg(host);
return 0;
}
#endif
static const struct dev_pm_ops msdc_dev_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
pm_runtime_force_resume)
SET_RUNTIME_PM_OPS(msdc_runtime_suspend, msdc_runtime_resume, NULL)
};
static const struct of_device_id msdc_of_ids[] = {
{ .compatible = "mediatek,mt8135-mmc", },
{}
};
static struct platform_driver mt_msdc_driver = {
.probe = msdc_drv_probe,
.remove = msdc_drv_remove,
.driver = {
.name = "mtk-msdc",
.of_match_table = msdc_of_ids,
.pm = &msdc_dev_pm_ops,
},
};
module_platform_driver(mt_msdc_driver);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("MediaTek SD/MMC Card Driver");
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