[qemu.git] / hw / ssi-sd.c

/*
 * SSI to SD card adapter.
 *
 * Copyright (c) 2007 CodeSourcery.
 * Written by Paul Brook
 *
 * This code is licenced under the GPL.
 */

#include "hw.h"
#include "sd.h"

//#define DEBUG_SSI_SD 1

#ifdef DEBUG_SSI_SD
#define DPRINTF(fmt, args...) \
do { printf("ssi_sd: " fmt , ##args); } while (0)
#define BADF(fmt, args...) \
do { fprintf(stderr, "ssi_sd: error: " fmt , ##args); exit(1);} while (0)
#else
#define DPRINTF(fmt, args...) do {} while(0)
#define BADF(fmt, args...) \
do { fprintf(stderr, "ssi_sd: error: " fmt , ##args);} while (0)
#endif

typedef enum {
    SSI_SD_CMD,
    SSI_SD_CMDARG,
    SSI_SD_RESPONSE,
    SSI_SD_DATA_START,
    SSI_SD_DATA_READ,
} ssi_sd_mode;

typedef struct {
    ssi_sd_mode mode;
    int cmd;
    uint8_t cmdarg[4];
    uint8_t response[5];
    int arglen;
    int response_pos;
    int stopping;
    SDState *sd;
} ssi_sd_state;

/* State word bits.  */
#define SSI_SDR_LOCKED          0x0001
#define SSI_SDR_WP_ERASE        0x0002
#define SSI_SDR_ERROR           0x0004
#define SSI_SDR_CC_ERROR        0x0008
#define SSI_SDR_ECC_FAILED      0x0010
#define SSI_SDR_WP_VIOLATION    0x0020
#define SSI_SDR_ERASE_PARAM     0x0040
#define SSI_SDR_OUT_OF_RANGE    0x0080
#define SSI_SDR_IDLE            0x0100
#define SSI_SDR_ERASE_RESET     0x0200
#define SSI_SDR_ILLEGAL_COMMAND 0x0400
#define SSI_SDR_COM_CRC_ERROR   0x0800
#define SSI_SDR_ERASE_SEQ_ERROR 0x1000
#define SSI_SDR_ADDRESS_ERROR   0x2000
#define SSI_SDR_PARAMETER_ERROR 0x4000

int ssi_sd_xfer(void *opaque, int val)
{
    ssi_sd_state *s = (ssi_sd_state *)opaque;

    /* Special case: allow CMD12 (STOP TRANSMISSION) while reading data.  */
    if (s->mode == SSI_SD_DATA_READ && val == 0x4d) {
        s->mode = SSI_SD_CMD;
        /* There must be at least one byte delay before the card responds.  */
        s->stopping = 1;
    }

    switch (s->mode) {
    case SSI_SD_CMD:
        if (val == 0xff) {
            DPRINTF("NULL command\n");
            return 0xff;
        }
        s->cmd = val & 0x3f;
        s->mode = SSI_SD_CMDARG;
        s->arglen = 0;
        return 0xff;
    case SSI_SD_CMDARG:
        if (s->arglen == 4) {
            struct sd_request_s request;
            uint8_t longresp[16];
            /* FIXME: Check CRC.  */
            request.cmd = s->cmd;
            request.arg = (s->cmdarg[0] << 24) | (s->cmdarg[1] << 16)
                           | (s->cmdarg[2] << 8) | s->cmdarg[3];
            DPRINTF("CMD%d arg 0x%08x\n", s->cmd, request.arg);
            s->arglen = sd_do_command(s->sd, &request, longresp);
            if (s->arglen <= 0) {
                s->arglen = 1;
                s->response[0] = 4;
                DPRINTF("SD command failed\n");
            } else if (s->cmd == 58) {
                /* CMD58 returns R3 response (OCR)  */
                DPRINTF("Returned OCR\n");
                s->arglen = 5;
                s->response[0] = 1;
                memcpy(&s->response[1], longresp, 4);
            } else if (s->arglen != 4) {
                BADF("Unexpected response to cmd %d\n", s->cmd);
                /* Illegal command is about as near as we can get.  */
                s->arglen = 1;
                s->response[0] = 4;
            } else {
                /* All other commands return status.  */
                uint32_t cardstatus;
                uint16_t status;
                /* CMD13 returns a 2-byte statuse work. Other commands
                   only return the first byte.  */
                s->arglen = (s->cmd == 13) ? 2 : 1;
                cardstatus = (longresp[0] << 24) | (longresp[1] << 16)
                             | (longresp[2] << 8) | longresp[3];
                status = 0;
                if (((cardstatus >> 9) & 0xf) < 4)
                    status |= SSI_SDR_IDLE;
                if (cardstatus & ERASE_RESET)
                    status |= SSI_SDR_ERASE_RESET;
                if (cardstatus & ILLEGAL_COMMAND)
                    status |= SSI_SDR_ILLEGAL_COMMAND;
                if (cardstatus & COM_CRC_ERROR)
                    status |= SSI_SDR_COM_CRC_ERROR;
                if (cardstatus & ERASE_SEQ_ERROR)
                    status |= SSI_SDR_ERASE_SEQ_ERROR;
                if (cardstatus & ADDRESS_ERROR)
                    status |= SSI_SDR_ADDRESS_ERROR;
                if (cardstatus & CARD_IS_LOCKED)
                    status |= SSI_SDR_LOCKED;
                if (cardstatus & (LOCK_UNLOCK_FAILED | WP_ERASE_SKIP))
                    status |= SSI_SDR_WP_ERASE;
                if (cardstatus & SD_ERROR)
                    status |= SSI_SDR_ERROR;
                if (cardstatus & CC_ERROR)
                    status |= SSI_SDR_CC_ERROR;
                if (cardstatus & CARD_ECC_FAILED)
                    status |= SSI_SDR_ECC_FAILED;
                if (cardstatus & WP_VIOLATION)
                    status |= SSI_SDR_WP_VIOLATION;
                if (cardstatus & ERASE_PARAM)
                    status |= SSI_SDR_ERASE_PARAM;
                if (cardstatus & (OUT_OF_RANGE | CID_CSD_OVERWRITE))
                    status |= SSI_SDR_OUT_OF_RANGE;
                /* ??? Don't know what Parameter Error really means, so
                   assume it's set if the second byte is nonzero.  */
                if (status & 0xff)
                    status |= SSI_SDR_PARAMETER_ERROR;
                s->response[0] = status >> 8;
                s->response[1] = status;
                DPRINTF("Card status 0x%02x\n", status);
            }
            s->mode = SSI_SD_RESPONSE;
            s->response_pos = 0;
        } else {
            s->cmdarg[s->arglen++] = val;
        }
        return 0xff;
    case SSI_SD_RESPONSE:
        if (s->stopping) {
            s->stopping = 0;
            return 0xff;
        }
        if (s->response_pos < s->arglen) {
            DPRINTF("Response 0x%02x\n", s->response[s->response_pos]);
            return s->response[s->response_pos++];
        }
        if (sd_data_ready(s->sd)) {
            DPRINTF("Data read\n");
            s->mode = SSI_SD_DATA_START;
        } else {
            DPRINTF("End of command\n");
            s->mode = SSI_SD_CMD;
        }
        return 0xff;
    case SSI_SD_DATA_START:
        DPRINTF("Start read block\n");
        s->mode = SSI_SD_DATA_READ;
        return 0xfe;
    case SSI_SD_DATA_READ:
        val = sd_read_data(s->sd);
        if (!sd_data_ready(s->sd)) {
            DPRINTF("Data read end\n");
            s->mode = SSI_SD_CMD;
        }
        return val;
    }
    /* Should never happen.  */
    return 0xff;
}

void *ssi_sd_init(BlockDriverState *bs)
{
    ssi_sd_state *s;

    s = (ssi_sd_state *)qemu_mallocz(sizeof(ssi_sd_state));
    s->mode = SSI_SD_CMD;
    s->sd = sd_init(bs, 1);
    return s;
}
Commit	Line	Data
775616c3 PB	1	/*
	2	* SSI to SD card adapter.
	3	*
	4	* Copyright (c) 2007 CodeSourcery.
	5	* Written by Paul Brook
	6	*
	7	* This code is licenced under the GPL.
	8	*/
	9
	10	#include "hw.h"
	11	#include "sd.h"
	12
	13	//#define DEBUG_SSI_SD 1
	14
	15	#ifdef DEBUG_SSI_SD
	16	#define DPRINTF(fmt, args...) \
	17	do { printf("ssi_sd: " fmt , ##args); } while (0)
	18	#define BADF(fmt, args...) \
	19	do { fprintf(stderr, "ssi_sd: error: " fmt , ##args); exit(1);} while (0)
	20	#else
	21	#define DPRINTF(fmt, args...) do {} while(0)
	22	#define BADF(fmt, args...) \
	23	do { fprintf(stderr, "ssi_sd: error: " fmt , ##args);} while (0)
	24	#endif
	25
	26	typedef enum {
	27	SSI_SD_CMD,
	28	SSI_SD_CMDARG,
	29	SSI_SD_RESPONSE,
	30	SSI_SD_DATA_START,
	31	SSI_SD_DATA_READ,
	32	} ssi_sd_mode;
	33
	34	typedef struct {
	35	ssi_sd_mode mode;
	36	int cmd;
	37	uint8_t cmdarg[4];
	38	uint8_t response[5];
	39	int arglen;
	40	int response_pos;
	41	int stopping;
	42	SDState *sd;
	43	} ssi_sd_state;
	44
	45	/* State word bits. */
	46	#define SSI_SDR_LOCKED 0x0001
	47	#define SSI_SDR_WP_ERASE 0x0002
	48	#define SSI_SDR_ERROR 0x0004
	49	#define SSI_SDR_CC_ERROR 0x0008
	50	#define SSI_SDR_ECC_FAILED 0x0010
	51	#define SSI_SDR_WP_VIOLATION 0x0020
	52	#define SSI_SDR_ERASE_PARAM 0x0040
	53	#define SSI_SDR_OUT_OF_RANGE 0x0080
	54	#define SSI_SDR_IDLE 0x0100
	55	#define SSI_SDR_ERASE_RESET 0x0200
	56	#define SSI_SDR_ILLEGAL_COMMAND 0x0400
	57	#define SSI_SDR_COM_CRC_ERROR 0x0800
	58	#define SSI_SDR_ERASE_SEQ_ERROR 0x1000
	59	#define SSI_SDR_ADDRESS_ERROR 0x2000
	60	#define SSI_SDR_PARAMETER_ERROR 0x4000
	61
	62	int ssi_sd_xfer(void *opaque, int val)
	63	{
	64	ssi_sd_state s = (ssi_sd_state )opaque;
65
66	/* Special case: allow CMD12 (STOP TRANSMISSION) while reading data. */
67	if (s->mode == SSI_SD_DATA_READ && val == 0x4d) {
68	s->mode = SSI_SD_CMD;
69	/* There must be at least one byte delay before the card responds. */
70	s->stopping = 1;
71	}
72
73	switch (s->mode) {
74	case SSI_SD_CMD:
75	if (val == 0xff) {
76	DPRINTF("NULL command\n");
77	return 0xff;
78	}
79	s->cmd = val & 0x3f;
80	s->mode = SSI_SD_CMDARG;
81	s->arglen = 0;
82	return 0xff;
83	case SSI_SD_CMDARG:
84	if (s->arglen == 4) {
85	struct sd_request_s request;
86	uint8_t longresp[16];
87	/* FIXME: Check CRC. */
88	request.cmd = s->cmd;
89	request.arg = (s->cmdarg[0] << 24) \| (s->cmdarg[1] << 16)
90	\| (s->cmdarg[2] << 8) \| s->cmdarg[3];
91	DPRINTF("CMD%d arg 0x%08x\n", s->cmd, request.arg);
92	s->arglen = sd_do_command(s->sd, &request, longresp);
93	if (s->arglen <= 0) {
94	s->arglen = 1;
95	s->response[0] = 4;
96	DPRINTF("SD command failed\n");
97	} else if (s->cmd == 58) {
98	/* CMD58 returns R3 response (OCR) */
99	DPRINTF("Returned OCR\n");
100	s->arglen = 5;
101	s->response[0] = 1;
102	memcpy(&s->response[1], longresp, 4);
103	} else if (s->arglen != 4) {
104	BADF("Unexpected response to cmd %d\n", s->cmd);
105	/* Illegal command is about as near as we can get. */
106	s->arglen = 1;
107	s->response[0] = 4;
108	} else {
109	/* All other commands return status. */
110	uint32_t cardstatus;
111	uint16_t status;
112	/* CMD13 returns a 2-byte statuse work. Other commands
113	only return the first byte. */
114	s->arglen = (s->cmd == 13) ? 2 : 1;
115	cardstatus = (longresp[0] << 24) \| (longresp[1] << 16)
116	\| (longresp[2] << 8) \| longresp[3];
117	status = 0;
118	if (((cardstatus >> 9) & 0xf) < 4)
119	status \|= SSI_SDR_IDLE;
120	if (cardstatus & ERASE_RESET)
121	status \|= SSI_SDR_ERASE_RESET;
122	if (cardstatus & ILLEGAL_COMMAND)
123	status \|= SSI_SDR_ILLEGAL_COMMAND;
124	if (cardstatus & COM_CRC_ERROR)
125	status \|= SSI_SDR_COM_CRC_ERROR;
126	if (cardstatus & ERASE_SEQ_ERROR)
127	status \|= SSI_SDR_ERASE_SEQ_ERROR;
128	if (cardstatus & ADDRESS_ERROR)
129	status \|= SSI_SDR_ADDRESS_ERROR;
130	if (cardstatus & CARD_IS_LOCKED)
131	status \|= SSI_SDR_LOCKED;
132	if (cardstatus & (LOCK_UNLOCK_FAILED \| WP_ERASE_SKIP))
133	status \|= SSI_SDR_WP_ERASE;
134	if (cardstatus & SD_ERROR)
135	status \|= SSI_SDR_ERROR;
136	if (cardstatus & CC_ERROR)
137	status \|= SSI_SDR_CC_ERROR;
138	if (cardstatus & CARD_ECC_FAILED)
139	status \|= SSI_SDR_ECC_FAILED;
140	if (cardstatus & WP_VIOLATION)
141	status \|= SSI_SDR_WP_VIOLATION;
142	if (cardstatus & ERASE_PARAM)
143	status \|= SSI_SDR_ERASE_PARAM;
144	if (cardstatus & (OUT_OF_RANGE \| CID_CSD_OVERWRITE))
145	status \|= SSI_SDR_OUT_OF_RANGE;
146	/* ??? Don't know what Parameter Error really means, so
147	assume it's set if the second byte is nonzero. */
148	if (status & 0xff)
149	status \|= SSI_SDR_PARAMETER_ERROR;
150	s->response[0] = status >> 8;
151	s->response[1] = status;
152	DPRINTF("Card status 0x%02x\n", status);
153	}
154	s->mode = SSI_SD_RESPONSE;
155	s->response_pos = 0;
156	} else {
157	s->cmdarg[s->arglen++] = val;
158	}
159	return 0xff;
160	case SSI_SD_RESPONSE:
161	if (s->stopping) {
162	s->stopping = 0;
163	return 0xff;
164	}
165	if (s->response_pos < s->arglen) {
166	DPRINTF("Response 0x%02x\n", s->response[s->response_pos]);
167	return s->response[s->response_pos++];
168	}
169	if (sd_data_ready(s->sd)) {
170	DPRINTF("Data read\n");
171	s->mode = SSI_SD_DATA_START;
172	} else {
173	DPRINTF("End of command\n");
174	s->mode = SSI_SD_CMD;
175	}
176	return 0xff;
177	case SSI_SD_DATA_START:
178	DPRINTF("Start read block\n");
179	s->mode = SSI_SD_DATA_READ;
180	return 0xfe;
181	case SSI_SD_DATA_READ:
182	val = sd_read_data(s->sd);
183	if (!sd_data_ready(s->sd)) {
184	DPRINTF("Data read end\n");
185	s->mode = SSI_SD_CMD;
186	}
187	return val;
188	}
189	/* Should never happen. */
190	return 0xff;
191	}
192
193	void ssi_sd_init(BlockDriverState bs)
194	{
195	ssi_sd_state *s;
196
197	s = (ssi_sd_state *)qemu_mallocz(sizeof(ssi_sd_state));
198	s->mode = SSI_SD_CMD;
199	s->sd = sd_init(bs, 1);
200	return s;
201	}
202