drivers/mmc/host/tmio_mmc.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Driver for the MMC / SD / SDIO cell found in:
   4  *
   5  * TC6393XB TC6391XB TC6387XB T7L66XB ASIC3
   6  *
   7  * Copyright (C) 2015-19 Renesas Electronics Corporation
   8  * Copyright (C) 2016-19 Sang Engineering, Wolfram Sang
   9  * Copyright (C) 2016-17 Horms Solutions, Simon Horman
  10  * Copyright (C) 2007 Ian Molton
  11  * Copyright (C) 2004 Ian Molton
  12  */
  13
  14 #ifndef TMIO_MMC_H
  15 #define TMIO_MMC_H
  16
  17 #include <linux/dmaengine.h>
  18 #include <linux/highmem.h>
  19 #include <linux/mutex.h>
  20 #include <linux/pagemap.h>
  21 #include <linux/scatterlist.h>
  22 #include <linux/spinlock.h>
  23 #include <linux/interrupt.h>
  24 #include <linux/workqueue.h>
  25
  26 #define CTL_SD_CMD 0x00
  27 #define CTL_ARG_REG 0x04
  28 #define CTL_STOP_INTERNAL_ACTION 0x08
  29 #define CTL_XFER_BLK_COUNT 0xa
  30 #define CTL_RESPONSE 0x0c
  31 /* driver merges STATUS and following STATUS2 */
  32 #define CTL_STATUS 0x1c
  33 /* driver merges IRQ_MASK and following IRQ_MASK2 */
  34 #define CTL_IRQ_MASK 0x20
  35 #define CTL_SD_CARD_CLK_CTL 0x24
  36 #define CTL_SD_XFER_LEN 0x26
  37 #define CTL_SD_MEM_CARD_OPT 0x28
  38 #define CTL_SD_ERROR_DETAIL_STATUS 0x2c
  39 #define CTL_SD_DATA_PORT 0x30
  40 #define CTL_TRANSACTION_CTL 0x34
  41 #define CTL_SDIO_STATUS 0x36
  42 #define CTL_SDIO_IRQ_MASK 0x38
  43 #define CTL_DMA_ENABLE 0xd8
  44 #define CTL_RESET_SD 0xe0
  45 #define CTL_VERSION 0xe2
  46 #define CTL_SDIF_MODE 0xe6 /* only known on R-Car 2+ */
  47
  48 /* Definitions for values the CTL_STOP_INTERNAL_ACTION register can take */
  49 #define TMIO_STOP_STP           BIT(0)
  50 #define TMIO_STOP_SEC           BIT(8)
  51
  52 /* Definitions for values the CTL_STATUS register can take */
  53 #define TMIO_STAT_CMDRESPEND    BIT(0)
  54 #define TMIO_STAT_DATAEND       BIT(2)
  55 #define TMIO_STAT_CARD_REMOVE   BIT(3)
  56 #define TMIO_STAT_CARD_INSERT   BIT(4)
  57 #define TMIO_STAT_SIGSTATE      BIT(5)
  58 #define TMIO_STAT_WRPROTECT     BIT(7)
  59 #define TMIO_STAT_CARD_REMOVE_A BIT(8)
  60 #define TMIO_STAT_CARD_INSERT_A BIT(9)
  61 #define TMIO_STAT_SIGSTATE_A    BIT(10)
  62
  63 /* These belong technically to CTL_STATUS2, but the driver merges them */
  64 #define TMIO_STAT_CMD_IDX_ERR   BIT(16)
  65 #define TMIO_STAT_CRCFAIL       BIT(17)
  66 #define TMIO_STAT_STOPBIT_ERR   BIT(18)
  67 #define TMIO_STAT_DATATIMEOUT   BIT(19)
  68 #define TMIO_STAT_RXOVERFLOW    BIT(20)
  69 #define TMIO_STAT_TXUNDERRUN    BIT(21)
  70 #define TMIO_STAT_CMDTIMEOUT    BIT(22)
  71 #define TMIO_STAT_DAT0          BIT(23) /* only known on R-Car so far */
  72 #define TMIO_STAT_RXRDY         BIT(24)
  73 #define TMIO_STAT_TXRQ          BIT(25)
  74 #define TMIO_STAT_ALWAYS_SET_27 BIT(27) /* only known on R-Car 2+ so far */
  75 #define TMIO_STAT_ILL_FUNC      BIT(29) /* only when !TMIO_MMC_HAS_IDLE_WAIT */
  76 #define TMIO_STAT_SCLKDIVEN     BIT(29) /* only when TMIO_MMC_HAS_IDLE_WAIT */
  77 #define TMIO_STAT_CMD_BUSY      BIT(30)
  78 #define TMIO_STAT_ILL_ACCESS    BIT(31)
  79
  80 /* Definitions for values the CTL_SD_CARD_CLK_CTL register can take */
  81 #define CLK_CTL_DIV_MASK        0xff
  82 #define CLK_CTL_SCLKEN          BIT(8)
  83
  84 /* Definitions for values the CTL_SD_MEM_CARD_OPT register can take */
  85 #define CARD_OPT_TOP_MASK       0xf0
  86 #define CARD_OPT_TOP_SHIFT      4
  87 #define CARD_OPT_EXTOP          BIT(9) /* first appeared on R-Car Gen3 SDHI */
  88 #define CARD_OPT_WIDTH8         BIT(13)
  89 #define CARD_OPT_ALWAYS1        BIT(14)
  90 #define CARD_OPT_WIDTH          BIT(15)
  91
  92 /* Definitions for values the CTL_SDIO_STATUS register can take */
  93 #define TMIO_SDIO_STAT_IOIRQ    0x0001
  94 #define TMIO_SDIO_STAT_EXPUB52  0x4000
  95 #define TMIO_SDIO_STAT_EXWT     0x8000
  96 #define TMIO_SDIO_MASK_ALL      0xc007
  97
  98 #define TMIO_SDIO_SETBITS_MASK  0x0006
  99
 100 /* Definitions for values the CTL_DMA_ENABLE register can take */
 101 #define DMA_ENABLE_DMASDRW      BIT(1)
 102
 103 /* Definitions for values the CTL_SDIF_MODE register can take */
 104 #define SDIF_MODE_HS400         BIT(0) /* only known on R-Car 2+ */
 105
 106 /* Define some IRQ masks */
 107 /* This is the mask used at reset by the chip */
 108 #define TMIO_MASK_ALL           0x837f031d
 109 #define TMIO_MASK_ALL_RCAR2     0x8b7f031d
 110 #define TMIO_MASK_READOP  (TMIO_STAT_RXRDY | TMIO_STAT_DATAEND)
 111 #define TMIO_MASK_WRITEOP (TMIO_STAT_TXRQ | TMIO_STAT_DATAEND)
 112 #define TMIO_MASK_CMD     (TMIO_STAT_CMDRESPEND | TMIO_STAT_CMDTIMEOUT | \
 113                 TMIO_STAT_CARD_REMOVE | TMIO_STAT_CARD_INSERT)
 114 #define TMIO_MASK_IRQ     (TMIO_MASK_READOP | TMIO_MASK_WRITEOP | TMIO_MASK_CMD)
 115
 116 #define TMIO_MAX_BLK_SIZE 512
 117
 118 struct tmio_mmc_data;
 119 struct tmio_mmc_host;
 120
 121 struct tmio_mmc_dma_ops {
 122         void (*start)(struct tmio_mmc_host *host, struct mmc_data *data);
 123         void (*enable)(struct tmio_mmc_host *host, bool enable);
 124         void (*request)(struct tmio_mmc_host *host,
 125                         struct tmio_mmc_data *pdata);
 126         void (*release)(struct tmio_mmc_host *host);
 127         void (*abort)(struct tmio_mmc_host *host);
 128         void (*dataend)(struct tmio_mmc_host *host);
 129
 130         /* optional */
 131         void (*end)(struct tmio_mmc_host *host);        /* held host->lock */
 132         bool (*dma_irq)(struct tmio_mmc_host *host);
 133 };
 134
 135 struct tmio_mmc_host {
 136         void __iomem *ctl;
 137         struct mmc_command      *cmd;
 138         struct mmc_request      *mrq;
 139         struct mmc_data         *data;
 140         struct mmc_host         *mmc;
 141         struct mmc_host_ops     ops;
 142
 143         /* pio related stuff */
 144         struct scatterlist      *sg_ptr;
 145         struct scatterlist      *sg_orig;
 146         unsigned int            sg_len;
 147         unsigned int            sg_off;
 148         unsigned int            bus_shift;
 149
 150         struct platform_device *pdev;
 151         struct tmio_mmc_data *pdata;
 152
 153         /* DMA support */
 154         bool                    dma_on;
 155         struct dma_chan         *chan_rx;
 156         struct dma_chan         *chan_tx;
 157         struct work_struct      dma_issue;
 158         struct scatterlist      bounce_sg;
 159         u8                      *bounce_buf;
 160
 161         /* Track lost interrupts */
 162         struct delayed_work     delayed_reset_work;
 163         struct work_struct      done;
 164
 165         /* Cache */
 166         u32                     sdcard_irq_mask;
 167         u32                     sdio_irq_mask;
 168         unsigned int            clk_cache;
 169         u32                     sdcard_irq_setbit_mask;
 170         u32                     sdcard_irq_mask_all;
 171
 172         spinlock_t              lock;           /* protect host private data */
 173         unsigned long           last_req_ts;
 174         struct mutex            ios_lock;       /* protect set_ios() context */
 175         bool                    native_hotplug;
 176         bool                    sdio_irq_enabled;
 177
 178         /* Mandatory callback */
 179         int (*clk_enable)(struct tmio_mmc_host *host);
 180         void (*set_clock)(struct tmio_mmc_host *host, unsigned int clock);
 181
 182         /* Optional callbacks */
 183         void (*clk_disable)(struct tmio_mmc_host *host);
 184         int (*multi_io_quirk)(struct mmc_card *card,
 185                               unsigned int direction, int blk_size);
 186         int (*write16_hook)(struct tmio_mmc_host *host, int addr);
 187         void (*reset)(struct tmio_mmc_host *host, bool preserve);
 188         bool (*check_retune)(struct tmio_mmc_host *host, struct mmc_request *mrq);
 189         void (*fixup_request)(struct tmio_mmc_host *host, struct mmc_request *mrq);
 190         unsigned int (*get_timeout_cycles)(struct tmio_mmc_host *host);
 191
 192         const struct tmio_mmc_dma_ops *dma_ops;
 193 };
 194
 195 struct tmio_mmc_host *tmio_mmc_host_alloc(struct platform_device *pdev,
 196                                           struct tmio_mmc_data *pdata);
 197 void tmio_mmc_host_free(struct tmio_mmc_host *host);
 198 int tmio_mmc_host_probe(struct tmio_mmc_host *host);
 199 void tmio_mmc_host_remove(struct tmio_mmc_host *host);
 200 void tmio_mmc_do_data_irq(struct tmio_mmc_host *host);
 201
 202 void tmio_mmc_enable_mmc_irqs(struct tmio_mmc_host *host, u32 i);
 203 void tmio_mmc_disable_mmc_irqs(struct tmio_mmc_host *host, u32 i);
 204 irqreturn_t tmio_mmc_irq(int irq, void *devid);
 205
 206 #ifdef CONFIG_PM
 207 int tmio_mmc_host_runtime_suspend(struct device *dev);
 208 int tmio_mmc_host_runtime_resume(struct device *dev);
 209 #endif
 210
 211 static inline u16 sd_ctrl_read16(struct tmio_mmc_host *host, int addr)
 212 {
 213         return ioread16(host->ctl + (addr << host->bus_shift));
 214 }
 215
 216 static inline void sd_ctrl_read16_rep(struct tmio_mmc_host *host, int addr,
 217                                       u16 *buf, int count)
 218 {
 219         ioread16_rep(host->ctl + (addr << host->bus_shift), buf, count);
 220 }
 221
 222 static inline u32 sd_ctrl_read16_and_16_as_32(struct tmio_mmc_host *host,
 223                                               int addr)
 224 {
 225         return ioread16(host->ctl + (addr << host->bus_shift)) |
 226                ioread16(host->ctl + ((addr + 2) << host->bus_shift)) << 16;
 227 }
 228
 229 static inline void sd_ctrl_read32_rep(struct tmio_mmc_host *host, int addr,
 230                                       u32 *buf, int count)
 231 {
 232         ioread32_rep(host->ctl + (addr << host->bus_shift), buf, count);
 233 }
 234
 235 static inline void sd_ctrl_write16(struct tmio_mmc_host *host, int addr,
 236                                    u16 val)
 237 {
 238         /* If there is a hook and it returns non-zero then there
 239          * is an error and the write should be skipped
 240          */
 241         if (host->write16_hook && host->write16_hook(host, addr))
 242                 return;
 243         iowrite16(val, host->ctl + (addr << host->bus_shift));
 244 }
 245
 246 static inline void sd_ctrl_write16_rep(struct tmio_mmc_host *host, int addr,
 247                                        u16 *buf, int count)
 248 {
 249         iowrite16_rep(host->ctl + (addr << host->bus_shift), buf, count);
 250 }
 251
 252 static inline void sd_ctrl_write32_as_16_and_16(struct tmio_mmc_host *host,
 253                                                 int addr, u32 val)
 254 {
 255         if (addr == CTL_IRQ_MASK || addr == CTL_STATUS)
 256                 val |= host->sdcard_irq_setbit_mask;
 257
 258         iowrite16(val & 0xffff, host->ctl + (addr << host->bus_shift));
 259         iowrite16(val >> 16, host->ctl + ((addr + 2) << host->bus_shift));
 260 }
 261
 262 static inline void sd_ctrl_write32(struct tmio_mmc_host *host, int addr, u32 val)
 263 {
 264         iowrite32(val, host->ctl + (addr << host->bus_shift));
 265 }
 266
 267 static inline void sd_ctrl_write32_rep(struct tmio_mmc_host *host, int addr,
 268                                        const u32 *buf, int count)
 269 {
 270         iowrite32_rep(host->ctl + (addr << host->bus_shift), buf, count);
 271 }
 272
 273 #endif