drivers/mmc/host/tmio_mmc.h

   1 /*
   2  * Driver for the MMC / SD / SDIO cell found in:
   3  *
   4  * TC6393XB TC6391XB TC6387XB T7L66XB ASIC3
   5  *
   6  * Copyright (C) 2015-17 Renesas Electronics Corporation
   7  * Copyright (C) 2016-17 Sang Engineering, Wolfram Sang
   8  * Copyright (C) 2016-17 Horms Solutions, Simon Horman
   9  * Copyright (C) 2007 Ian Molton
  10  * Copyright (C) 2004 Ian Molton
  11  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License version 2 as
  14  * published by the Free Software Foundation.
  15  *
  16  */
  17
  18 #ifndef TMIO_MMC_H
  19 #define TMIO_MMC_H
  20
  21 #include <linux/dmaengine.h>
  22 #include <linux/highmem.h>
  23 #include <linux/mutex.h>
  24 #include <linux/pagemap.h>
  25 #include <linux/scatterlist.h>
  26 #include <linux/spinlock.h>
  27 #include <linux/interrupt.h>
  28
  29 #define CTL_SD_CMD 0x00
  30 #define CTL_ARG_REG 0x04
  31 #define CTL_STOP_INTERNAL_ACTION 0x08
  32 #define CTL_XFER_BLK_COUNT 0xa
  33 #define CTL_RESPONSE 0x0c
  34 /* driver merges STATUS and following STATUS2 */
  35 #define CTL_STATUS 0x1c
  36 /* driver merges IRQ_MASK and following IRQ_MASK2 */
  37 #define CTL_IRQ_MASK 0x20
  38 #define CTL_SD_CARD_CLK_CTL 0x24
  39 #define CTL_SD_XFER_LEN 0x26
  40 #define CTL_SD_MEM_CARD_OPT 0x28
  41 #define CTL_SD_ERROR_DETAIL_STATUS 0x2c
  42 #define CTL_SD_DATA_PORT 0x30
  43 #define CTL_TRANSACTION_CTL 0x34
  44 #define CTL_SDIO_STATUS 0x36
  45 #define CTL_SDIO_IRQ_MASK 0x38
  46 #define CTL_DMA_ENABLE 0xd8
  47 #define CTL_RESET_SD 0xe0
  48 #define CTL_VERSION 0xe2
  49 #define CTL_SDIO_REGS 0x100
  50 #define CTL_CLK_AND_WAIT_CTL 0x138
  51 #define CTL_RESET_SDIO 0x1e0
  52
  53 /* Definitions for values the CTL_STOP_INTERNAL_ACTION register can take */
  54 #define TMIO_STOP_STP           BIT(0)
  55 #define TMIO_STOP_SEC           BIT(8)
  56
  57 /* Definitions for values the CTL_STATUS register can take */
  58 #define TMIO_STAT_CMDRESPEND    BIT(0)
  59 #define TMIO_STAT_DATAEND       BIT(2)
  60 #define TMIO_STAT_CARD_REMOVE   BIT(3)
  61 #define TMIO_STAT_CARD_INSERT   BIT(4)
  62 #define TMIO_STAT_SIGSTATE      BIT(5)
  63 #define TMIO_STAT_WRPROTECT     BIT(7)
  64 #define TMIO_STAT_CARD_REMOVE_A BIT(8)
  65 #define TMIO_STAT_CARD_INSERT_A BIT(9)
  66 #define TMIO_STAT_SIGSTATE_A    BIT(10)
  67
  68 /* These belong technically to CTL_STATUS2, but the driver merges them */
  69 #define TMIO_STAT_CMD_IDX_ERR   BIT(16)
  70 #define TMIO_STAT_CRCFAIL       BIT(17)
  71 #define TMIO_STAT_STOPBIT_ERR   BIT(18)
  72 #define TMIO_STAT_DATATIMEOUT   BIT(19)
  73 #define TMIO_STAT_RXOVERFLOW    BIT(20)
  74 #define TMIO_STAT_TXUNDERRUN    BIT(21)
  75 #define TMIO_STAT_CMDTIMEOUT    BIT(22)
  76 #define TMIO_STAT_DAT0          BIT(23) /* only known on R-Car so far */
  77 #define TMIO_STAT_RXRDY         BIT(24)
  78 #define TMIO_STAT_TXRQ          BIT(25)
  79 #define TMIO_STAT_ILL_FUNC      BIT(29) /* only when !TMIO_MMC_HAS_IDLE_WAIT */
  80 #define TMIO_STAT_SCLKDIVEN     BIT(29) /* only when TMIO_MMC_HAS_IDLE_WAIT */
  81 #define TMIO_STAT_CMD_BUSY      BIT(30)
  82 #define TMIO_STAT_ILL_ACCESS    BIT(31)
  83
  84 #define CLK_CTL_DIV_MASK        0xff
  85 #define CLK_CTL_SCLKEN          BIT(8)
  86
  87 #define CARD_OPT_WIDTH8         BIT(13)
  88 #define CARD_OPT_WIDTH          BIT(15)
  89
  90 #define TMIO_BBS                512             /* Boot block size */
  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 /* Define some IRQ masks */
 101 /* This is the mask used at reset by the chip */
 102 #define TMIO_MASK_ALL           0x837f031d
 103 #define TMIO_MASK_READOP  (TMIO_STAT_RXRDY | TMIO_STAT_DATAEND)
 104 #define TMIO_MASK_WRITEOP (TMIO_STAT_TXRQ | TMIO_STAT_DATAEND)
 105 #define TMIO_MASK_CMD     (TMIO_STAT_CMDRESPEND | TMIO_STAT_CMDTIMEOUT | \
 106                 TMIO_STAT_CARD_REMOVE | TMIO_STAT_CARD_INSERT)
 107 #define TMIO_MASK_IRQ     (TMIO_MASK_READOP | TMIO_MASK_WRITEOP | TMIO_MASK_CMD)
 108
 109 struct tmio_mmc_data;
 110 struct tmio_mmc_host;
 111
 112 struct tmio_mmc_dma {
 113         enum dma_slave_buswidth dma_buswidth;
 114         bool (*filter)(struct dma_chan *chan, void *arg);
 115         void (*enable)(struct tmio_mmc_host *host, bool enable);
 116 };
 117
 118 struct tmio_mmc_dma_ops {
 119         void (*start)(struct tmio_mmc_host *host, struct mmc_data *data);
 120         void (*enable)(struct tmio_mmc_host *host, bool enable);
 121         void (*request)(struct tmio_mmc_host *host,
 122                         struct tmio_mmc_data *pdata);
 123         void (*release)(struct tmio_mmc_host *host);
 124         void (*abort)(struct tmio_mmc_host *host);
 125 };
 126
 127 struct tmio_mmc_host {
 128         void __iomem *ctl;
 129         struct mmc_command      *cmd;
 130         struct mmc_request      *mrq;
 131         struct mmc_data         *data;
 132         struct mmc_host         *mmc;
 133
 134         /* Callbacks for clock / power control */
 135         void (*set_pwr)(struct platform_device *host, int state);
 136         void (*set_clk_div)(struct platform_device *host, int state);
 137
 138         /* pio related stuff */
 139         struct scatterlist      *sg_ptr;
 140         struct scatterlist      *sg_orig;
 141         unsigned int            sg_len;
 142         unsigned int            sg_off;
 143         unsigned long           bus_shift;
 144
 145         struct platform_device *pdev;
 146         struct tmio_mmc_data *pdata;
 147         struct tmio_mmc_dma     *dma;
 148
 149         /* DMA support */
 150         bool                    force_pio;
 151         struct dma_chan         *chan_rx;
 152         struct dma_chan         *chan_tx;
 153         struct completion       dma_dataend;
 154         struct tasklet_struct   dma_issue;
 155         struct scatterlist      bounce_sg;
 156         u8                      *bounce_buf;
 157
 158         /* Track lost interrupts */
 159         struct delayed_work     delayed_reset_work;
 160         struct work_struct      done;
 161
 162         /* Cache */
 163         u32                     sdcard_irq_mask;
 164         u32                     sdio_irq_mask;
 165         unsigned int            clk_cache;
 166
 167         spinlock_t              lock;           /* protect host private data */
 168         unsigned long           last_req_ts;
 169         struct mutex            ios_lock;       /* protect set_ios() context */
 170         bool                    native_hotplug;
 171         bool                    sdio_irq_enabled;
 172         u32                     scc_tappos;
 173
 174         /* Mandatory callback */
 175         int (*clk_enable)(struct tmio_mmc_host *host);
 176
 177         /* Optional callbacks */
 178         unsigned int (*clk_update)(struct tmio_mmc_host *host,
 179                                    unsigned int new_clock);
 180         void (*clk_disable)(struct tmio_mmc_host *host);
 181         int (*multi_io_quirk)(struct mmc_card *card,
 182                               unsigned int direction, int blk_size);
 183         int (*card_busy)(struct mmc_host *mmc);
 184         int (*start_signal_voltage_switch)(struct mmc_host *mmc,
 185                                            struct mmc_ios *ios);
 186         int (*write16_hook)(struct tmio_mmc_host *host, int addr);
 187         void (*hw_reset)(struct tmio_mmc_host *host);
 188         void (*prepare_tuning)(struct tmio_mmc_host *host, unsigned long tap);
 189         bool (*check_scc_error)(struct tmio_mmc_host *host);
 190
 191         /*
 192          * Mandatory callback for tuning to occur which is optional for SDR50
 193          * and mandatory for SDR104.
 194          */
 195         unsigned int (*init_tuning)(struct tmio_mmc_host *host);
 196         int (*select_tuning)(struct tmio_mmc_host *host);
 197
 198         /* Tuning values: 1 for success, 0 for failure */
 199         DECLARE_BITMAP(taps, BITS_PER_BYTE * sizeof(long));
 200         unsigned int tap_num;
 201
 202         const struct tmio_mmc_dma_ops *dma_ops;
 203 };
 204
 205 struct tmio_mmc_host *tmio_mmc_host_alloc(struct platform_device *pdev);
 206 void tmio_mmc_host_free(struct tmio_mmc_host *host);
 207 int tmio_mmc_host_probe(struct tmio_mmc_host *host,
 208                         struct tmio_mmc_data *pdata,
 209                         const struct tmio_mmc_dma_ops *dma_ops);
 210 void tmio_mmc_host_remove(struct tmio_mmc_host *host);
 211 void tmio_mmc_do_data_irq(struct tmio_mmc_host *host);
 212
 213 void tmio_mmc_enable_mmc_irqs(struct tmio_mmc_host *host, u32 i);
 214 void tmio_mmc_disable_mmc_irqs(struct tmio_mmc_host *host, u32 i);
 215 irqreturn_t tmio_mmc_irq(int irq, void *devid);
 216
 217 static inline char *tmio_mmc_kmap_atomic(struct scatterlist *sg,
 218                                          unsigned long *flags)
 219 {
 220         local_irq_save(*flags);
 221         return kmap_atomic(sg_page(sg)) + sg->offset;
 222 }
 223
 224 static inline void tmio_mmc_kunmap_atomic(struct scatterlist *sg,
 225                                           unsigned long *flags, void *virt)
 226 {
 227         kunmap_atomic(virt - sg->offset);
 228         local_irq_restore(*flags);
 229 }
 230
 231 #ifdef CONFIG_PM
 232 int tmio_mmc_host_runtime_suspend(struct device *dev);
 233 int tmio_mmc_host_runtime_resume(struct device *dev);
 234 #endif
 235
 236 static inline u16 sd_ctrl_read16(struct tmio_mmc_host *host, int addr)
 237 {
 238         return readw(host->ctl + (addr << host->bus_shift));
 239 }
 240
 241 static inline void sd_ctrl_read16_rep(struct tmio_mmc_host *host, int addr,
 242                                       u16 *buf, int count)
 243 {
 244         readsw(host->ctl + (addr << host->bus_shift), buf, count);
 245 }
 246
 247 static inline u32 sd_ctrl_read16_and_16_as_32(struct tmio_mmc_host *host,
 248                                               int addr)
 249 {
 250         return readw(host->ctl + (addr << host->bus_shift)) |
 251                readw(host->ctl + ((addr + 2) << host->bus_shift)) << 16;
 252 }
 253
 254 static inline void sd_ctrl_read32_rep(struct tmio_mmc_host *host, int addr,
 255                                       u32 *buf, int count)
 256 {
 257         readsl(host->ctl + (addr << host->bus_shift), buf, count);
 258 }
 259
 260 static inline void sd_ctrl_write16(struct tmio_mmc_host *host, int addr,
 261                                    u16 val)
 262 {
 263         /* If there is a hook and it returns non-zero then there
 264          * is an error and the write should be skipped
 265          */
 266         if (host->write16_hook && host->write16_hook(host, addr))
 267                 return;
 268         writew(val, host->ctl + (addr << host->bus_shift));
 269 }
 270
 271 static inline void sd_ctrl_write16_rep(struct tmio_mmc_host *host, int addr,
 272                                        u16 *buf, int count)
 273 {
 274         writesw(host->ctl + (addr << host->bus_shift), buf, count);
 275 }
 276
 277 static inline void sd_ctrl_write32_as_16_and_16(struct tmio_mmc_host *host,
 278                                                 int addr, u32 val)
 279 {
 280         writew(val & 0xffff, host->ctl + (addr << host->bus_shift));
 281         writew(val >> 16, host->ctl + ((addr + 2) << host->bus_shift));
 282 }
 283
 284 static inline void sd_ctrl_write32_rep(struct tmio_mmc_host *host, int addr,
 285                                        const u32 *buf, int count)
 286 {
 287         writesl(host->ctl + (addr << host->bus_shift), buf, count);
 288 }
 289
 290 #endif