drivers/mtd/nand/raw/r852.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Copyright © 2009 - Maxim Levitsky
   4  * driver for Ricoh xD readers
   5  */
   6
   7 #include <linux/pci.h>
   8 #include <linux/completion.h>
   9 #include <linux/workqueue.h>
  10 #include <linux/mtd/rawnand.h>
  11 #include <linux/spinlock.h>
  12
  13
  14 /* nand interface + ecc
  15    byte write/read does one cycle on nand data lines.
  16    dword write/read does 4 cycles
  17    if R852_CTL_ECC_ACCESS is set in R852_CTL, then dword read reads
  18    results of ecc correction, if DMA read was done before.
  19    If write was done two dword reads read generated ecc checksums
  20 */
  21 #define R852_DATALINE           0x00
  22
  23 /* control register */
  24 #define R852_CTL                0x04
  25 #define R852_CTL_COMMAND        0x01    /* send command (#CLE)*/
  26 #define R852_CTL_DATA           0x02    /* read/write data (#ALE)*/
  27 #define R852_CTL_ON             0x04    /* only seem to controls the hd led, */
  28                                         /* but has to be set on start...*/
  29 #define R852_CTL_RESET          0x08    /* unknown, set only on start once*/
  30 #define R852_CTL_CARDENABLE     0x10    /* probably (#CE) - always set*/
  31 #define R852_CTL_ECC_ENABLE     0x20    /* enable ecc engine */
  32 #define R852_CTL_ECC_ACCESS     0x40    /* read/write ecc via reg #0*/
  33 #define R852_CTL_WRITE          0x80    /* set when performing writes (#WP) */
  34
  35 /* card detection status */
  36 #define R852_CARD_STA           0x05
  37
  38 #define R852_CARD_STA_CD        0x01    /* state of #CD line, same as 0x04 */
  39 #define R852_CARD_STA_RO        0x02    /* card is readonly */
  40 #define R852_CARD_STA_PRESENT   0x04    /* card is present (#CD) */
  41 #define R852_CARD_STA_ABSENT    0x08    /* card is absent */
  42 #define R852_CARD_STA_BUSY      0x80    /* card is busy - (#R/B) */
  43
  44 /* card detection irq status & enable*/
  45 #define R852_CARD_IRQ_STA       0x06    /* IRQ status */
  46 #define R852_CARD_IRQ_ENABLE    0x07    /* IRQ enable */
  47
  48 #define R852_CARD_IRQ_CD        0x01    /* fire when #CD lights, same as 0x04*/
  49 #define R852_CARD_IRQ_REMOVE    0x04    /* detect card removal */
  50 #define R852_CARD_IRQ_INSERT    0x08    /* detect card insert */
  51 #define R852_CARD_IRQ_UNK1      0x10    /* unknown */
  52 #define R852_CARD_IRQ_GENABLE   0x80    /* general enable */
  53 #define R852_CARD_IRQ_MASK      0x1D
  54
  55
  56
  57 /* hardware enable */
  58 #define R852_HW                 0x08
  59 #define R852_HW_ENABLED         0x01    /* hw enabled */
  60 #define R852_HW_UNKNOWN         0x80
  61
  62
  63 /* dma capabilities */
  64 #define R852_DMA_CAP            0x09
  65 #define R852_SMBIT              0x20    /* if set with bit #6 or bit #7, then */
  66                                         /* hw is smartmedia */
  67 #define R852_DMA1               0x40    /* if set w/bit #7, dma is supported */
  68 #define R852_DMA2               0x80    /* if set w/bit #6, dma is supported */
  69
  70
  71 /* physical DMA address - 32 bit value*/
  72 #define R852_DMA_ADDR           0x0C
  73
  74
  75 /* dma settings */
  76 #define R852_DMA_SETTINGS       0x10
  77 #define R852_DMA_MEMORY         0x01    /* (memory <-> internal hw buffer) */
  78 #define R852_DMA_READ           0x02    /* 0 = write, 1 = read */
  79 #define R852_DMA_INTERNAL       0x04    /* (internal hw buffer <-> card) */
  80
  81 /* dma IRQ status */
  82 #define R852_DMA_IRQ_STA                0x14
  83
  84 /* dma IRQ enable */
  85 #define R852_DMA_IRQ_ENABLE     0x18
  86
  87 #define R852_DMA_IRQ_MEMORY     0x01    /* (memory <-> internal hw buffer) */
  88 #define R852_DMA_IRQ_ERROR      0x02    /* error did happen */
  89 #define R852_DMA_IRQ_INTERNAL   0x04    /* (internal hw buffer <-> card) */
  90 #define R852_DMA_IRQ_MASK       0x07    /* mask of all IRQ bits */
  91
  92
  93 /* ECC syndrome format - read from reg #0 will return two copies of these for
  94    each half of the page.
  95    first byte is error byte location, and second, bit location + flags */
  96 #define R852_ECC_ERR_BIT_MSK    0x07    /* error bit location */
  97 #define R852_ECC_CORRECT                0x10    /* no errors - (guessed) */
  98 #define R852_ECC_CORRECTABLE    0x20    /* correctable error exist */
  99 #define R852_ECC_FAIL           0x40    /* non correctable error detected */
 100
 101 #define R852_DMA_LEN            512
 102
 103 #define DMA_INTERNAL    0
 104 #define DMA_MEMORY      1
 105
 106 struct r852_device {
 107         void __iomem *mmio;             /* mmio */
 108         struct nand_chip *chip;         /* nand chip backpointer */
 109         struct pci_dev *pci_dev;        /* pci backpointer */
 110
 111         /* dma area */
 112         dma_addr_t phys_dma_addr;       /* bus address of buffer*/
 113         struct completion dma_done;     /* data transfer done */
 114
 115         dma_addr_t phys_bounce_buffer;  /* bus address of bounce buffer */
 116         uint8_t *bounce_buffer;         /* virtual address of bounce buffer */
 117
 118         int dma_dir;                    /* 1 = read, 0 = write */
 119         int dma_stage;                  /* 0 - idle, 1 - first step,
 120                                            2 - second step */
 121
 122         int dma_state;                  /* 0 = internal, 1 = memory */
 123         int dma_error;                  /* dma errors */
 124         int dma_usable;                 /* is it possible to use dma */
 125
 126         /* card status area */
 127         struct delayed_work card_detect_work;
 128         struct workqueue_struct *card_workqueue;
 129         int card_registered;            /* card registered with mtd */
 130         int card_detected;              /* card detected in slot */
 131         int card_unstable;              /* whenever the card is inserted,
 132                                            is not known yet */
 133         int readonly;                   /* card is readonly */
 134         int sm;                         /* Is card smartmedia */
 135
 136         /* interrupt handling */
 137         spinlock_t irqlock;             /* IRQ protecting lock */
 138         int irq;                        /* irq num */
 139         /* misc */
 140         void *tmp_buffer;               /* temporary buffer */
 141         uint8_t ctlreg;                 /* cached contents of control reg */
 142 };
 143
 144 #define dbg(format, ...) \
 145         if (debug) \
 146                 pr_debug(format "\n", ## __VA_ARGS__)
 147
 148 #define dbg_verbose(format, ...) \
 149         if (debug > 1) \
 150                 pr_debug(format "\n", ## __VA_ARGS__)
 151
 152
 153 #define message(format, ...) \
 154         pr_info(format "\n", ## __VA_ARGS__)