DCMD_MMCSD_VUC_CMD

Arguments to devctl():

Description:

This command executes a vendor-unique command. The MMCSD_VUC_CMD structure is defined as follows:

typedef struct _mmcsd_vuc_cmd {
        int             result;
        uint16_t        opcode;
        uint16_t        rsvd2;
        uint32_t        flags;
        uint32_t        arg;
        uint32_t        resp[4];
        uint32_t        blk_sz;
        paddr_t         data_ptr;
        uint32_t        buf_off;
        uint32_t        data_len;
        uint32_t        timeout;
        uint32_t        postdelay_us;
        uint32_t        rsvd[2];
} MMCSD_VUC_CMD;

The members include:

result

The return code from the VUC; one of:

• MMC_VUC_SUCCESS
• MMC_VUC_FAILED
• MMC_VUC_NOTISSUED
• MMC_VUC_NODEV

opcode

flags

A bitwise OR of the following:

• MMCSD_VUC_END — this is the last command in the array
• MMCSD_VUC_DATA_NONE —
• MMCSD_VUC_DATA_IN —
• MMCSD_VUC_DATA_OUT —
• MMCSD_VUC_DATA_PHYS — the data_ptr member holds the physical address of the data; if this bit isn't set, the device is using PIO mode.
• MMCSD_VUC_RCA — is the relative card address valid in the rca field
• MMCSD_VUC_ACMD — an application-specific command is needed
• MMCSD_VUC_NOAC12 — by default, auto CMD12 is enabled
• MMCSD_VUC_RESP_OFF — bit offset
• MMCSD_VUC_RESP_NONE —
• MMCSD_VUC_RESP_R1 —
• MMCSD_VUC_RESP_R1B —
• MMCSD_VUC_RESP_R2 —
• MMCSD_VUC_RESP_R3 —
• MMCSD_VUC_RESP_R6 —
• MMCSD_VUC_RESP_R7 —

MMCSD_VUC_DATA_MSK is a mask for the bits that indicate whether or not data is present and its direction. MMCSD_VUC_RESP_MSK is a mask for the response type.

/*
 * for performance,
 * we assume that the RESP bits are the same as internal driver defines.
 * If any of the internal defines change (which I doubt), we will need to
 * add parsing code to do the translation.
#define MMC_RSP_PRESENT (1 << 0)
#define MMC_RSP_136             (1 << 1)        // 136 bit response
#define MMC_RSP_CRC             (1 << 2)        // expect valid crc
#define MMC_RSP_BUSY    (1 << 3)        // card may send busy
#define MMC_RSP_OPCODE  (1 << 4)        // response contains opcode
 */

arg

resp[4]

blk_sz

data_ptr

A physical address of a buffer that's provided by client. It's assumed to be noncacheable dma-able (contiguous).

buf_off

For PIO mode (i.e., MMCSD_VUC_DATA_PHYS isn't set), this is the offset of the buffer for this command in the array, starting from the first command structure.

data_len

timeout

The timeout value for the command, in milliseconds. The default is 5 seconds if this member is set to 0.

postdelay_us

The number of microseconds to sleep for after each VUC.

Input:

Output:

See also:

devctl() in the QNX Neutrino C Library Reference