mirrors/qemu
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

hw/sd: ssi-sd: Support multiple block write

Browse Source 
For a multiple block write operation, each block begins with a multi
write start token. Unlike the SD mode that the multiple block write
ends when receiving a STOP_TRAN command (CMD12), a special stop tran
token is used to signal the card.

Emulating this by manually sending a CMD12 to the SD card core, to
bring it out of the receiving data state.

Signed-off-by: Bin Meng <bin.meng@windriver.com>
Tested-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Acked-by: Alistair Francis <alistair.francis@wdc.com>
Message-Id: <20210128063035.15674-7-bmeng.cn@gmail.com>
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
This commit is contained in:
Bin Meng 2021-01-28 14:30:32 +08:00 committed by Philippe Mathieu-Daudé
parent 5020e3cb76
commit d56f3efa28
1 changed files with 31 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

33
hw/sd/ssi-sd.c
View File

@ -4,6 +4,11 @@
* Copyright (c) 2007-2009 CodeSourcery.
* Written by Paul Brook
*
* Copyright (c) 2021 Wind River Systems, Inc.
* Improved by Bin Meng <bin.meng@windriver.com>
*
* Validated with U-Boot v2021.01 and Linux v5.10 mmc_spi driver
*
* This code is licensed under the GNU GPL v2.
*
* Contributions after 2012-01-13 are licensed under the terms of the
@ -82,6 +87,10 @@ OBJECT_DECLARE_SIMPLE_TYPE(ssi_sd_state, SSI_SD)
#define SSI_SDR_ADDRESS_ERROR 0x2000
#define SSI_SDR_PARAMETER_ERROR 0x4000
/* multiple block write */
#define SSI_TOKEN_MULTI_WRITE 0xfc
/* terminate multiple block write */
#define SSI_TOKEN_STOP_TRAN 0xfd
/* single block read/write, multiple block read */
#define SSI_TOKEN_SINGLE 0xfe
@ -94,6 +103,8 @@ OBJECT_DECLARE_SIMPLE_TYPE(ssi_sd_state, SSI_SD)
static uint32_t ssi_sd_transfer(SSIPeripheral *dev, uint32_t val)
{
ssi_sd_state *s = SSI_SD(dev);
SDRequest request;
uint8_t longresp[16];
/*
* Special case: allow CMD12 (STOP TRANSMISSION) while reading data.
@ -125,8 +136,28 @@ static uint32_t ssi_sd_transfer(SSIPeripheral *dev, uint32_t val)
return SSI_DUMMY;
break;
case SSI_TOKEN_SINGLE:
case SSI_TOKEN_MULTI_WRITE:
DPRINTF("Start write block\n");
s->mode = SSI_SD_DATA_WRITE;
return SSI_DUMMY;
case SSI_TOKEN_STOP_TRAN:
DPRINTF("Stop multiple write\n");
/* manually issue cmd12 to stop the transfer */
request.cmd = 12;
request.arg = 0;
s->arglen = sdbus_do_command(&s->sdbus, &request, longresp);
if (s->arglen <= 0) {
s->arglen = 1;
/* a zero value indicates the card is busy */
s->response[0] = 0;
DPRINTF("SD card busy\n");
} else {
s->arglen = 1;
/* a non-zero value indicates the card is ready */
s->response[0] = SSI_DUMMY;
}
return SSI_DUMMY;
}
@ -136,8 +167,6 @@ static uint32_t ssi_sd_transfer(SSIPeripheral *dev, uint32_t val)
return SSI_DUMMY;
case SSI_SD_CMDARG:
if (s->arglen == 4) {
SDRequest request;
uint8_t longresp[16];
/* FIXME: Check CRC. */
request.cmd = s->cmd;
request.arg = ldl_be_p(s->cmdarg);