Defined register offsets and device configurations in structs to allow more flexibility. This change will allow to support multiple instances of a driver using a different bus. This is needed for the BeagleBone Black. Change-Id: I24e16faeea338c9a847941a846e6d4e49432525e
156 lines
4.5 KiB
C
156 lines
4.5 KiB
C
|
|
#define SUBPARTITION_PER_PARTITION 4 /* 4 sub partitions per partition */
|
|
#define PARTITONS_PER_DISK 4 /* 4 partitions per disk */
|
|
#define MINOR_PER_DISK 1 /* one additional minor to point to */
|
|
|
|
/**
|
|
* We can have multiple MMC host controller present on the hardware. The MINIX
|
|
* approach to handle this is to run a driver for each instance. Every driver
|
|
* will therefore be stated with an "instance" id and the rest of the code here
|
|
* will assume a single host controller to be present.
|
|
*
|
|
* The SD specification allows multiple cards to be attached to a single host
|
|
* controller using the same lines. I recommend reading SD Specifications Part 1
|
|
* Physical layer Simplified Specification chapter 3 about SD Memory Card system
|
|
* concepts if you want to get a better understanding of this.
|
|
*
|
|
* In practice an MMC host will usually have a single slot attached to it and that
|
|
* Slot may or may not contain a card. On sudden card removal we might want to
|
|
* keep track of the last inserted card and we might therefore at later stage
|
|
* add an additional "last_card" attribute to the card.
|
|
*
|
|
* The following diagram shows the structure that will be used to modulate the
|
|
* hardware written in umlwiki syntax.
|
|
*
|
|
* [/host/
|
|
* +instance:int] 1 --- 0..4 [ /slot/
|
|
* +card_detect:func ] 1 --- 0..1 [ /card/ ]
|
|
* `
|
|
*/
|
|
|
|
#define MAX_SD_SLOTS 4
|
|
|
|
struct mmc_host;
|
|
|
|
//TODO Add more modes like INACTIVE STATE and such
|
|
#define SD_MODE_UNINITIALIZED 0
|
|
#define SD_MODE_CARD_IDENTIFICATION 1
|
|
#define SD_MODE_DATA_TRANSFER_MODE 2
|
|
|
|
struct sd_card_regs
|
|
{
|
|
uint32_t cid[4]; /* Card Identification */
|
|
uint32_t rca; /* Relative card address */
|
|
uint32_t dsr; /* Driver stage register */
|
|
uint32_t csd[4]; /* Card specific data */
|
|
uint32_t scr[2]; /* SD configuration */
|
|
uint32_t ocr; /* Operation conditions */
|
|
uint32_t ssr[5]; /* SD Status */
|
|
uint32_t csr; /* Card status */
|
|
};
|
|
|
|
#define RESP_LEN_48_CHK_BUSY (3<<0)
|
|
#define RESP_LEN_48 (2<<0)
|
|
#define RESP_LEN_136 (1<<0)
|
|
#define RESP_NO_RESPONSE (0<<0)
|
|
|
|
#define DATA_NONE (0)
|
|
#define DATA_READ (1)
|
|
#define DATA_WRITE (2)
|
|
|
|
/* struct representing an mmc command */
|
|
struct mmc_command
|
|
{
|
|
uint32_t cmd;
|
|
uint32_t args;
|
|
uint32_t resp_type;
|
|
uint32_t data_type;
|
|
uint32_t resp[4];
|
|
unsigned char *data;
|
|
uint32_t data_len;
|
|
};
|
|
|
|
/* structure representing an SD card */
|
|
struct sd_card
|
|
{
|
|
/* pointer back to the SD slot for convenience */
|
|
struct sd_slot *slot;
|
|
|
|
struct sd_card_regs regs;
|
|
|
|
/* some helpers (data comming from the csd) */
|
|
uint32_t blk_size;
|
|
uint32_t blk_count;
|
|
|
|
/* drive state: deaf, initialized, dead */
|
|
unsigned state;
|
|
|
|
/* MINIX/block driver related things */
|
|
int open_ct; /* in-use count */
|
|
|
|
/* 1 disks + 4 partitions and 16 possible sub partitions */
|
|
struct device part[MINOR_PER_DISK + PARTITONS_PER_DISK];
|
|
struct device subpart[PARTITONS_PER_DISK * SUBPARTITION_PER_PARTITION];
|
|
};
|
|
|
|
/* structure representing an SD slot */
|
|
struct sd_slot
|
|
{
|
|
/* pointer back to the host for convenience */
|
|
struct mmc_host *host;
|
|
|
|
unsigned state;
|
|
struct sd_card card;
|
|
};
|
|
|
|
/* structure for the host controller */
|
|
struct mmc_host
|
|
{
|
|
/* MMC host configuration */
|
|
int (*host_set_instance) (struct mmc_host * host, int instance);
|
|
/* MMC host configuration */
|
|
int (*host_init) (struct mmc_host * host);
|
|
/* Set log level */
|
|
void (*set_log_level) (int level);
|
|
/* Host controller reset */
|
|
int (*host_reset) (struct mmc_host * host);
|
|
/* Card detection (binary yes/no) */
|
|
int (*card_detect) (struct sd_slot * slot);
|
|
/* Perform card detection e.g. card type */
|
|
struct sd_card *(*card_initialize) (struct sd_slot * slot);
|
|
/* Release the card */
|
|
int (*card_release) (struct sd_card * card);
|
|
|
|
/* Additional hardware interrupts */
|
|
void (*hw_intr) (unsigned int irqs);
|
|
|
|
/* read count blocks into existing buf */
|
|
int (*read) (struct sd_card * card,
|
|
uint32_t blknr, uint32_t count, unsigned char *buf);
|
|
|
|
/* write count blocks */
|
|
int (*write) (struct sd_card * card,
|
|
uint32_t blknr, uint32_t count, unsigned char *buf);
|
|
|
|
/* up to 4 slots with 4 SD cards */
|
|
struct sd_slot slot[MAX_SD_SLOTS];
|
|
};
|
|
|
|
#if 0
|
|
/* Command execution */
|
|
int (*send_cmd) (struct sd_card * card, struct mmc_command *);
|
|
|
|
/* struct representing an mmc command */
|
|
struct mmc_command
|
|
{
|
|
uint32_t cmd;
|
|
uint32_t args;
|
|
uint32_t resp[4];
|
|
unsigned char *data;
|
|
uint32_t data_len;
|
|
};
|
|
#endif
|
|
|
|
/* Hack done for driver registration */
|
|
void host_initialize_host_structure_mmchs(struct mmc_host *host);
|
|
void host_initialize_host_structure_dummy(struct mmc_host *host);
|