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u-boot/drivers/mmc/bfin_sdh.c
Mike Frysinger 6815f540db Blackfin: bfin_sdh: clean up send_cmd 
Simplify the command setup and status checking steps, and add a proper
timeout to the status polling code to avoid possible infinite hangs.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2010-10-02 16:00:37 -04:00

262 lines
6.7 KiB
C
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/*
* Driver for Blackfin on-chip SDH controller
*
* Copyright (c) 2008-2009 Analog Devices Inc.
*
* Licensed under the GPL-2 or later.
*/
#include <common.h>
#include <malloc.h>
#include <part.h>
#include <mmc.h>
#include <asm/io.h>
#include <asm/errno.h>
#include <asm/byteorder.h>
#include <asm/blackfin.h>
#include <asm/portmux.h>
#include <asm/mach-common/bits/sdh.h>
#include <asm/mach-common/bits/dma.h>
#if defined(__ADSPBF51x__)
# define bfin_read_SDH_PWR_CTL bfin_read_RSI_PWR_CONTROL
# define bfin_write_SDH_PWR_CTL bfin_write_RSI_PWR_CONTROL
# define bfin_read_SDH_CLK_CTL bfin_read_RSI_CLK_CONTROL
# define bfin_write_SDH_CLK_CTL bfin_write_RSI_CLK_CONTROL
# define bfin_write_SDH_ARGUMENT bfin_write_RSI_ARGUMENT
# define bfin_write_SDH_COMMAND bfin_write_RSI_COMMAND
# define bfin_read_SDH_RESPONSE0 bfin_read_RSI_RESPONSE0
# define bfin_read_SDH_RESPONSE1 bfin_read_RSI_RESPONSE1
# define bfin_read_SDH_RESPONSE2 bfin_read_RSI_RESPONSE2
# define bfin_read_SDH_RESPONSE3 bfin_read_RSI_RESPONSE3
# define bfin_write_SDH_DATA_TIMER bfin_write_RSI_DATA_TIMER
# define bfin_write_SDH_DATA_LGTH bfin_write_RSI_DATA_LGTH
# define bfin_read_SDH_DATA_CTL bfin_read_RSI_DATA_CONTROL
# define bfin_write_SDH_DATA_CTL bfin_write_RSI_DATA_CONTROL
# define bfin_read_SDH_STATUS bfin_read_RSI_STATUS
# define bfin_write_SDH_STATUS_CLR bfin_write_RSI_STATUSCL
# define bfin_read_SDH_CFG bfin_read_RSI_CONFIG
# define bfin_write_SDH_CFG bfin_write_RSI_CONFIG
# define bfin_write_DMA_START_ADDR bfin_write_DMA4_START_ADDR
# define bfin_write_DMA_X_COUNT bfin_write_DMA4_X_COUNT
# define bfin_write_DMA_X_MODIFY bfin_write_DMA4_X_MODIFY
# define bfin_write_DMA_CONFIG bfin_write_DMA4_CONFIG
# define PORTMUX_PINS \
{ P_RSI_DATA0, P_RSI_DATA1, P_RSI_DATA2, P_RSI_DATA3, P_RSI_CMD, P_RSI_CLK, 0 }
#elif defined(__ADSPBF54x__)
# define bfin_write_DMA_START_ADDR bfin_write_DMA22_START_ADDR
# define bfin_write_DMA_X_COUNT bfin_write_DMA22_X_COUNT
# define bfin_write_DMA_X_MODIFY bfin_write_DMA22_X_MODIFY
# define bfin_write_DMA_CONFIG bfin_write_DMA22_CONFIG
# define PORTMUX_PINS \
{ P_SD_D0, P_SD_D1, P_SD_D2, P_SD_D3, P_SD_CLK, P_SD_CMD, 0 }
#else
# error no support for this proc yet
#endif
static int
sdh_send_cmd(struct mmc *mmc, struct mmc_cmd *mmc_cmd)
{
unsigned int status, timeout;
int cmd = mmc_cmd->cmdidx;
int flags = mmc_cmd->resp_type;
int arg = mmc_cmd->cmdarg;
int ret;
u16 sdh_cmd;
sdh_cmd = cmd | CMD_E;
if (flags & MMC_RSP_PRESENT)
sdh_cmd |= CMD_RSP;
if (flags & MMC_RSP_136)
sdh_cmd |= CMD_L_RSP;
bfin_write_SDH_ARGUMENT(arg);
bfin_write_SDH_COMMAND(sdh_cmd);
/* wait for a while */
timeout = 0;
do {
if (++timeout > 1000000) {
status = CMD_TIME_OUT;
break;
}
udelay(1);
status = bfin_read_SDH_STATUS();
} while (!(status & (CMD_SENT | CMD_RESP_END | CMD_TIME_OUT |
CMD_CRC_FAIL)));
if (flags & MMC_RSP_PRESENT) {
mmc_cmd->response[0] = bfin_read_SDH_RESPONSE0();
if (flags & MMC_RSP_136) {
mmc_cmd->response[1] = bfin_read_SDH_RESPONSE1();
mmc_cmd->response[2] = bfin_read_SDH_RESPONSE2();
mmc_cmd->response[3] = bfin_read_SDH_RESPONSE3();
}
}
if (status & CMD_TIME_OUT)
ret = TIMEOUT;
else if (status & CMD_CRC_FAIL && flags & MMC_RSP_CRC)
ret = COMM_ERR;
else
ret = 0;
bfin_write_SDH_STATUS_CLR(CMD_SENT_STAT | CMD_RESP_END_STAT |
CMD_TIMEOUT_STAT | CMD_CRC_FAIL_STAT);
return ret;
}
/* set data for single block transfer */
static int sdh_setup_data(struct mmc *mmc, struct mmc_data *data)
{
u16 data_ctl = 0;
u16 dma_cfg = 0;
int ret = 0;
/* Don't support write yet. */
if (data->flags & MMC_DATA_WRITE)
return UNUSABLE_ERR;
data_ctl |= ((ffs(data->blocksize) - 1) << 4);
data_ctl |= DTX_DIR;
bfin_write_SDH_DATA_CTL(data_ctl);
dma_cfg = WDSIZE_32 | RESTART | WNR | DMAEN;
bfin_write_SDH_DATA_TIMER(0xFFFF);
blackfin_dcache_flush_invalidate_range(data->dest,
data->dest + data->blocksize);
/* configure DMA */
bfin_write_DMA_START_ADDR(data->dest);
bfin_write_DMA_X_COUNT(data->blocksize / 4);
bfin_write_DMA_X_MODIFY(4);
bfin_write_DMA_CONFIG(dma_cfg);
bfin_write_SDH_DATA_LGTH(data->blocksize);
/* kick off transfer */
bfin_write_SDH_DATA_CTL(bfin_read_SDH_DATA_CTL() | DTX_DMA_E | DTX_E);
return ret;
}
static int bfin_sdh_request(struct mmc *mmc, struct mmc_cmd *cmd,
struct mmc_data *data)
{
u32 status;
int ret = 0;
ret = sdh_send_cmd(mmc, cmd);
if (ret) {
printf("sending CMD%d failed\n", cmd->cmdidx);
return ret;
}
if (data) {
ret = sdh_setup_data(mmc, data);
do {
udelay(1);
status = bfin_read_SDH_STATUS();
} while (!(status & (DAT_BLK_END | DAT_END | DAT_TIME_OUT | DAT_CRC_FAIL | RX_OVERRUN)));
if (status & DAT_TIME_OUT) {
bfin_write_SDH_STATUS_CLR(DAT_TIMEOUT_STAT);
ret |= TIMEOUT;
} else if (status & (DAT_CRC_FAIL | RX_OVERRUN)) {
bfin_write_SDH_STATUS_CLR(DAT_CRC_FAIL_STAT | RX_OVERRUN_STAT);
ret |= COMM_ERR;
} else
bfin_write_SDH_STATUS_CLR(DAT_BLK_END_STAT | DAT_END_STAT);
if (ret) {
printf("tranfering data failed\n");
return ret;
}
}
return 0;
}
static void sdh_set_clk(unsigned long clk)
{
unsigned long sys_clk;
unsigned long clk_div;
u16 clk_ctl = 0;
clk_ctl = bfin_read_SDH_CLK_CTL();
if (clk) {
/* setting SD_CLK */
sys_clk = get_sclk();
bfin_write_SDH_CLK_CTL(clk_ctl & ~CLK_E);
if (sys_clk % (2 * clk) == 0)
clk_div = sys_clk / (2 * clk) - 1;
else
clk_div = sys_clk / (2 * clk);
if (clk_div > 0xff)
clk_div = 0xff;
clk_ctl |= (clk_div & 0xff);
clk_ctl |= CLK_E;
bfin_write_SDH_CLK_CTL(clk_ctl);
} else
bfin_write_SDH_CLK_CTL(clk_ctl & ~CLK_E);
}
static void bfin_sdh_set_ios(struct mmc *mmc)
{
u16 cfg = 0;
u16 clk_ctl = 0;
if (mmc->bus_width == 4) {
cfg = bfin_read_SDH_CFG();
cfg &= ~0x80;
cfg |= 0x40;
bfin_write_SDH_CFG(cfg);
clk_ctl |= WIDE_BUS;
}
bfin_write_SDH_CLK_CTL(clk_ctl);
sdh_set_clk(mmc->clock);
}
static int bfin_sdh_init(struct mmc *mmc)
{
const unsigned short pins[] = PORTMUX_PINS;
u16 pwr_ctl = 0;
/* Initialize sdh controller */
peripheral_request_list(pins, "bfin_sdh");
#if defined(__ADSPBF54x__)
bfin_write_DMAC1_PERIMUX(bfin_read_DMAC1_PERIMUX() | 0x1);
#endif
bfin_write_SDH_CFG(bfin_read_SDH_CFG() | CLKS_EN);
/* Disable card detect pin */
bfin_write_SDH_CFG((bfin_read_SDH_CFG() & 0x1F) | 0x60);
pwr_ctl |= ROD_CTL;
pwr_ctl |= PWR_ON;
bfin_write_SDH_PWR_CTL(pwr_ctl);
return 0;
}
int bfin_mmc_init(bd_t *bis)
{
struct mmc *mmc = NULL;
mmc = malloc(sizeof(struct mmc));
if (!mmc)
return -ENOMEM;
sprintf(mmc->name, "Blackfin SDH");
mmc->send_cmd = bfin_sdh_request;
mmc->set_ios = bfin_sdh_set_ios;
mmc->init = bfin_sdh_init;
mmc->host_caps = MMC_MODE_4BIT;
mmc->voltages = MMC_VDD_32_33 | MMC_VDD_33_34;
mmc->f_max = get_sclk();
mmc->f_min = mmc->f_max >> 9;
mmc->block_dev.part_type = PART_TYPE_DOS;
mmc_register(mmc);
return 0;
}
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