u-boot-brain/drivers/mmc/fsl_esdhc.c
Haijun.Zhang f7e27cc5ee esdhc: Workaround for card can't be detected on T4240QDS
Card detection pin is ineffective on T4240QDS Rev1.0.
There are two cards can be connected to board.
1. eMMC card is built-in board, can not be removed. so
   For eMMC card it is always there.
2. Card detecting pin is functional for SDHC card in Rev2.0.

This workaround force sdhc driver scan and initialize the card
regardless of whether the card is inserted or not in case Rev1.0.

Signed-off-by: Haijun Zhang <Haijun.Zhang@freescale.com>
Acked-by: Pantelis Antoniou <panto@antoniou-consulting.com>
Reviewed-by: York Sun <yorksun@freescale.com>
2014-01-22 08:56:15 -08:00

638 lines
16 KiB
C

/*
* Copyright 2007, 2010-2011 Freescale Semiconductor, Inc
* Andy Fleming
*
* Based vaguely on the pxa mmc code:
* (C) Copyright 2003
* Kyle Harris, Nexus Technologies, Inc. kharris@nexus-tech.net
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <config.h>
#include <common.h>
#include <command.h>
#include <hwconfig.h>
#include <mmc.h>
#include <part.h>
#include <malloc.h>
#include <mmc.h>
#include <fsl_esdhc.h>
#include <fdt_support.h>
#include <asm/io.h>
DECLARE_GLOBAL_DATA_PTR;
struct fsl_esdhc {
uint dsaddr; /* SDMA system address register */
uint blkattr; /* Block attributes register */
uint cmdarg; /* Command argument register */
uint xfertyp; /* Transfer type register */
uint cmdrsp0; /* Command response 0 register */
uint cmdrsp1; /* Command response 1 register */
uint cmdrsp2; /* Command response 2 register */
uint cmdrsp3; /* Command response 3 register */
uint datport; /* Buffer data port register */
uint prsstat; /* Present state register */
uint proctl; /* Protocol control register */
uint sysctl; /* System Control Register */
uint irqstat; /* Interrupt status register */
uint irqstaten; /* Interrupt status enable register */
uint irqsigen; /* Interrupt signal enable register */
uint autoc12err; /* Auto CMD error status register */
uint hostcapblt; /* Host controller capabilities register */
uint wml; /* Watermark level register */
uint mixctrl; /* For USDHC */
char reserved1[4]; /* reserved */
uint fevt; /* Force event register */
uint admaes; /* ADMA error status register */
uint adsaddr; /* ADMA system address register */
char reserved2[160]; /* reserved */
uint hostver; /* Host controller version register */
char reserved3[4]; /* reserved */
uint dmaerraddr; /* DMA error address register */
char reserved4[4]; /* reserved */
uint dmaerrattr; /* DMA error attribute register */
char reserved5[4]; /* reserved */
uint hostcapblt2; /* Host controller capabilities register 2 */
char reserved6[8]; /* reserved */
uint tcr; /* Tuning control register */
char reserved7[28]; /* reserved */
uint sddirctl; /* SD direction control register */
char reserved8[712]; /* reserved */
uint scr; /* eSDHC control register */
};
/* Return the XFERTYP flags for a given command and data packet */
static uint esdhc_xfertyp(struct mmc_cmd *cmd, struct mmc_data *data)
{
uint xfertyp = 0;
if (data) {
xfertyp |= XFERTYP_DPSEL;
#ifndef CONFIG_SYS_FSL_ESDHC_USE_PIO
xfertyp |= XFERTYP_DMAEN;
#endif
if (data->blocks > 1) {
xfertyp |= XFERTYP_MSBSEL;
xfertyp |= XFERTYP_BCEN;
#ifdef CONFIG_SYS_FSL_ERRATUM_ESDHC111
xfertyp |= XFERTYP_AC12EN;
#endif
}
if (data->flags & MMC_DATA_READ)
xfertyp |= XFERTYP_DTDSEL;
}
if (cmd->resp_type & MMC_RSP_CRC)
xfertyp |= XFERTYP_CCCEN;
if (cmd->resp_type & MMC_RSP_OPCODE)
xfertyp |= XFERTYP_CICEN;
if (cmd->resp_type & MMC_RSP_136)
xfertyp |= XFERTYP_RSPTYP_136;
else if (cmd->resp_type & MMC_RSP_BUSY)
xfertyp |= XFERTYP_RSPTYP_48_BUSY;
else if (cmd->resp_type & MMC_RSP_PRESENT)
xfertyp |= XFERTYP_RSPTYP_48;
#if defined(CONFIG_MX53) || defined(CONFIG_T4240QDS)
if (cmd->cmdidx == MMC_CMD_STOP_TRANSMISSION)
xfertyp |= XFERTYP_CMDTYP_ABORT;
#endif
return XFERTYP_CMD(cmd->cmdidx) | xfertyp;
}
#ifdef CONFIG_SYS_FSL_ESDHC_USE_PIO
/*
* PIO Read/Write Mode reduce the performace as DMA is not used in this mode.
*/
static void
esdhc_pio_read_write(struct mmc *mmc, struct mmc_data *data)
{
struct fsl_esdhc_cfg *cfg = mmc->priv;
struct fsl_esdhc *regs = (struct fsl_esdhc *)cfg->esdhc_base;
uint blocks;
char *buffer;
uint databuf;
uint size;
uint irqstat;
uint timeout;
if (data->flags & MMC_DATA_READ) {
blocks = data->blocks;
buffer = data->dest;
while (blocks) {
timeout = PIO_TIMEOUT;
size = data->blocksize;
irqstat = esdhc_read32(&regs->irqstat);
while (!(esdhc_read32(&regs->prsstat) & PRSSTAT_BREN)
&& --timeout);
if (timeout <= 0) {
printf("\nData Read Failed in PIO Mode.");
return;
}
while (size && (!(irqstat & IRQSTAT_TC))) {
udelay(100); /* Wait before last byte transfer complete */
irqstat = esdhc_read32(&regs->irqstat);
databuf = in_le32(&regs->datport);
*((uint *)buffer) = databuf;
buffer += 4;
size -= 4;
}
blocks--;
}
} else {
blocks = data->blocks;
buffer = (char *)data->src;
while (blocks) {
timeout = PIO_TIMEOUT;
size = data->blocksize;
irqstat = esdhc_read32(&regs->irqstat);
while (!(esdhc_read32(&regs->prsstat) & PRSSTAT_BWEN)
&& --timeout);
if (timeout <= 0) {
printf("\nData Write Failed in PIO Mode.");
return;
}
while (size && (!(irqstat & IRQSTAT_TC))) {
udelay(100); /* Wait before last byte transfer complete */
databuf = *((uint *)buffer);
buffer += 4;
size -= 4;
irqstat = esdhc_read32(&regs->irqstat);
out_le32(&regs->datport, databuf);
}
blocks--;
}
}
}
#endif
static int esdhc_setup_data(struct mmc *mmc, struct mmc_data *data)
{
int timeout;
struct fsl_esdhc_cfg *cfg = (struct fsl_esdhc_cfg *)mmc->priv;
struct fsl_esdhc *regs = (struct fsl_esdhc *)cfg->esdhc_base;
#ifndef CONFIG_SYS_FSL_ESDHC_USE_PIO
uint wml_value;
wml_value = data->blocksize/4;
if (data->flags & MMC_DATA_READ) {
if (wml_value > WML_RD_WML_MAX)
wml_value = WML_RD_WML_MAX_VAL;
esdhc_clrsetbits32(&regs->wml, WML_RD_WML_MASK, wml_value);
esdhc_write32(&regs->dsaddr, (u32)data->dest);
} else {
flush_dcache_range((ulong)data->src,
(ulong)data->src+data->blocks
*data->blocksize);
if (wml_value > WML_WR_WML_MAX)
wml_value = WML_WR_WML_MAX_VAL;
if ((esdhc_read32(&regs->prsstat) & PRSSTAT_WPSPL) == 0) {
printf("\nThe SD card is locked. Can not write to a locked card.\n\n");
return TIMEOUT;
}
esdhc_clrsetbits32(&regs->wml, WML_WR_WML_MASK,
wml_value << 16);
esdhc_write32(&regs->dsaddr, (u32)data->src);
}
#else /* CONFIG_SYS_FSL_ESDHC_USE_PIO */
if (!(data->flags & MMC_DATA_READ)) {
if ((esdhc_read32(&regs->prsstat) & PRSSTAT_WPSPL) == 0) {
printf("\nThe SD card is locked. "
"Can not write to a locked card.\n\n");
return TIMEOUT;
}
esdhc_write32(&regs->dsaddr, (u32)data->src);
} else
esdhc_write32(&regs->dsaddr, (u32)data->dest);
#endif /* CONFIG_SYS_FSL_ESDHC_USE_PIO */
esdhc_write32(&regs->blkattr, data->blocks << 16 | data->blocksize);
/* Calculate the timeout period for data transactions */
/*
* 1)Timeout period = (2^(timeout+13)) SD Clock cycles
* 2)Timeout period should be minimum 0.250sec as per SD Card spec
* So, Number of SD Clock cycles for 0.25sec should be minimum
* (SD Clock/sec * 0.25 sec) SD Clock cycles
* = (mmc->tran_speed * 1/4) SD Clock cycles
* As 1) >= 2)
* => (2^(timeout+13)) >= mmc->tran_speed * 1/4
* Taking log2 both the sides
* => timeout + 13 >= log2(mmc->tran_speed/4)
* Rounding up to next power of 2
* => timeout + 13 = log2(mmc->tran_speed/4) + 1
* => timeout + 13 = fls(mmc->tran_speed/4)
*/
timeout = fls(mmc->tran_speed/4);
timeout -= 13;
if (timeout > 14)
timeout = 14;
if (timeout < 0)
timeout = 0;
#ifdef CONFIG_SYS_FSL_ERRATUM_ESDHC_A001
if ((timeout == 4) || (timeout == 8) || (timeout == 12))
timeout++;
#endif
esdhc_clrsetbits32(&regs->sysctl, SYSCTL_TIMEOUT_MASK, timeout << 16);
return 0;
}
static void check_and_invalidate_dcache_range
(struct mmc_cmd *cmd,
struct mmc_data *data) {
unsigned start = (unsigned)data->dest ;
unsigned size = roundup(ARCH_DMA_MINALIGN,
data->blocks*data->blocksize);
unsigned end = start+size ;
invalidate_dcache_range(start, end);
}
/*
* Sends a command out on the bus. Takes the mmc pointer,
* a command pointer, and an optional data pointer.
*/
static int
esdhc_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd, struct mmc_data *data)
{
uint xfertyp;
uint irqstat;
struct fsl_esdhc_cfg *cfg = (struct fsl_esdhc_cfg *)mmc->priv;
volatile struct fsl_esdhc *regs = (struct fsl_esdhc *)cfg->esdhc_base;
#ifdef CONFIG_SYS_FSL_ERRATUM_ESDHC111
if (cmd->cmdidx == MMC_CMD_STOP_TRANSMISSION)
return 0;
#endif
esdhc_write32(&regs->irqstat, -1);
sync();
/* Wait for the bus to be idle */
while ((esdhc_read32(&regs->prsstat) & PRSSTAT_CICHB) ||
(esdhc_read32(&regs->prsstat) & PRSSTAT_CIDHB))
;
while (esdhc_read32(&regs->prsstat) & PRSSTAT_DLA)
;
/* Wait at least 8 SD clock cycles before the next command */
/*
* Note: This is way more than 8 cycles, but 1ms seems to
* resolve timing issues with some cards
*/
udelay(1000);
/* Set up for a data transfer if we have one */
if (data) {
int err;
err = esdhc_setup_data(mmc, data);
if(err)
return err;
}
/* Figure out the transfer arguments */
xfertyp = esdhc_xfertyp(cmd, data);
/* Mask all irqs */
esdhc_write32(&regs->irqsigen, 0);
/* Send the command */
esdhc_write32(&regs->cmdarg, cmd->cmdarg);
#if defined(CONFIG_FSL_USDHC)
esdhc_write32(&regs->mixctrl,
(esdhc_read32(&regs->mixctrl) & 0xFFFFFF80) | (xfertyp & 0x7F));
esdhc_write32(&regs->xfertyp, xfertyp & 0xFFFF0000);
#else
esdhc_write32(&regs->xfertyp, xfertyp);
#endif
/* Wait for the command to complete */
while (!(esdhc_read32(&regs->irqstat) & (IRQSTAT_CC | IRQSTAT_CTOE)))
;
irqstat = esdhc_read32(&regs->irqstat);
/* Reset CMD and DATA portions on error */
if (irqstat & (CMD_ERR | IRQSTAT_CTOE)) {
esdhc_write32(&regs->sysctl, esdhc_read32(&regs->sysctl) |
SYSCTL_RSTC);
while (esdhc_read32(&regs->sysctl) & SYSCTL_RSTC)
;
if (data) {
esdhc_write32(&regs->sysctl,
esdhc_read32(&regs->sysctl) |
SYSCTL_RSTD);
while ((esdhc_read32(&regs->sysctl) & SYSCTL_RSTD))
;
}
}
if (irqstat & CMD_ERR)
return COMM_ERR;
if (irqstat & IRQSTAT_CTOE)
return TIMEOUT;
/* Workaround for ESDHC errata ENGcm03648 */
if (!data && (cmd->resp_type & MMC_RSP_BUSY)) {
int timeout = 2500;
/* Poll on DATA0 line for cmd with busy signal for 250 ms */
while (timeout > 0 && !(esdhc_read32(&regs->prsstat) &
PRSSTAT_DAT0)) {
udelay(100);
timeout--;
}
if (timeout <= 0) {
printf("Timeout waiting for DAT0 to go high!\n");
return TIMEOUT;
}
}
/* Copy the response to the response buffer */
if (cmd->resp_type & MMC_RSP_136) {
u32 cmdrsp3, cmdrsp2, cmdrsp1, cmdrsp0;
cmdrsp3 = esdhc_read32(&regs->cmdrsp3);
cmdrsp2 = esdhc_read32(&regs->cmdrsp2);
cmdrsp1 = esdhc_read32(&regs->cmdrsp1);
cmdrsp0 = esdhc_read32(&regs->cmdrsp0);
cmd->response[0] = (cmdrsp3 << 8) | (cmdrsp2 >> 24);
cmd->response[1] = (cmdrsp2 << 8) | (cmdrsp1 >> 24);
cmd->response[2] = (cmdrsp1 << 8) | (cmdrsp0 >> 24);
cmd->response[3] = (cmdrsp0 << 8);
} else
cmd->response[0] = esdhc_read32(&regs->cmdrsp0);
/* Wait until all of the blocks are transferred */
if (data) {
#ifdef CONFIG_SYS_FSL_ESDHC_USE_PIO
esdhc_pio_read_write(mmc, data);
#else
do {
irqstat = esdhc_read32(&regs->irqstat);
if (irqstat & IRQSTAT_DTOE)
return TIMEOUT;
if (irqstat & DATA_ERR)
return COMM_ERR;
} while ((irqstat & DATA_COMPLETE) != DATA_COMPLETE);
#endif
if (data->flags & MMC_DATA_READ)
check_and_invalidate_dcache_range(cmd, data);
}
esdhc_write32(&regs->irqstat, -1);
return 0;
}
static void set_sysctl(struct mmc *mmc, uint clock)
{
int div, pre_div;
struct fsl_esdhc_cfg *cfg = (struct fsl_esdhc_cfg *)mmc->priv;
volatile struct fsl_esdhc *regs = (struct fsl_esdhc *)cfg->esdhc_base;
int sdhc_clk = cfg->sdhc_clk;
uint clk;
if (clock < mmc->f_min)
clock = mmc->f_min;
if (sdhc_clk / 16 > clock) {
for (pre_div = 2; pre_div < 256; pre_div *= 2)
if ((sdhc_clk / pre_div) <= (clock * 16))
break;
} else
pre_div = 2;
for (div = 1; div <= 16; div++)
if ((sdhc_clk / (div * pre_div)) <= clock)
break;
pre_div >>= 1;
div -= 1;
clk = (pre_div << 8) | (div << 4);
esdhc_clrbits32(&regs->sysctl, SYSCTL_CKEN);
esdhc_clrsetbits32(&regs->sysctl, SYSCTL_CLOCK_MASK, clk);
udelay(10000);
clk = SYSCTL_PEREN | SYSCTL_CKEN;
esdhc_setbits32(&regs->sysctl, clk);
}
static void esdhc_set_ios(struct mmc *mmc)
{
struct fsl_esdhc_cfg *cfg = (struct fsl_esdhc_cfg *)mmc->priv;
struct fsl_esdhc *regs = (struct fsl_esdhc *)cfg->esdhc_base;
/* Set the clock speed */
set_sysctl(mmc, mmc->clock);
/* Set the bus width */
esdhc_clrbits32(&regs->proctl, PROCTL_DTW_4 | PROCTL_DTW_8);
if (mmc->bus_width == 4)
esdhc_setbits32(&regs->proctl, PROCTL_DTW_4);
else if (mmc->bus_width == 8)
esdhc_setbits32(&regs->proctl, PROCTL_DTW_8);
}
static int esdhc_init(struct mmc *mmc)
{
struct fsl_esdhc_cfg *cfg = (struct fsl_esdhc_cfg *)mmc->priv;
struct fsl_esdhc *regs = (struct fsl_esdhc *)cfg->esdhc_base;
int timeout = 1000;
/* Reset the entire host controller */
esdhc_setbits32(&regs->sysctl, SYSCTL_RSTA);
/* Wait until the controller is available */
while ((esdhc_read32(&regs->sysctl) & SYSCTL_RSTA) && --timeout)
udelay(1000);
#ifndef ARCH_MXC
/* Enable cache snooping */
esdhc_write32(&regs->scr, 0x00000040);
#endif
esdhc_setbits32(&regs->sysctl, SYSCTL_HCKEN | SYSCTL_IPGEN);
/* Set the initial clock speed */
mmc_set_clock(mmc, 400000);
/* Disable the BRR and BWR bits in IRQSTAT */
esdhc_clrbits32(&regs->irqstaten, IRQSTATEN_BRR | IRQSTATEN_BWR);
/* Put the PROCTL reg back to the default */
esdhc_write32(&regs->proctl, PROCTL_INIT);
/* Set timout to the maximum value */
esdhc_clrsetbits32(&regs->sysctl, SYSCTL_TIMEOUT_MASK, 14 << 16);
return 0;
}
static int esdhc_getcd(struct mmc *mmc)
{
struct fsl_esdhc_cfg *cfg = (struct fsl_esdhc_cfg *)mmc->priv;
struct fsl_esdhc *regs = (struct fsl_esdhc *)cfg->esdhc_base;
int timeout = 1000;
#ifdef CONFIG_ESDHC_DETECT_QUIRK
if (CONFIG_ESDHC_DETECT_QUIRK)
return 1;
#endif
while (!(esdhc_read32(&regs->prsstat) & PRSSTAT_CINS) && --timeout)
udelay(1000);
return timeout > 0;
}
static void esdhc_reset(struct fsl_esdhc *regs)
{
unsigned long timeout = 100; /* wait max 100 ms */
/* reset the controller */
esdhc_setbits32(&regs->sysctl, SYSCTL_RSTA);
/* hardware clears the bit when it is done */
while ((esdhc_read32(&regs->sysctl) & SYSCTL_RSTA) && --timeout)
udelay(1000);
if (!timeout)
printf("MMC/SD: Reset never completed.\n");
}
int fsl_esdhc_initialize(bd_t *bis, struct fsl_esdhc_cfg *cfg)
{
struct fsl_esdhc *regs;
struct mmc *mmc;
u32 caps, voltage_caps;
if (!cfg)
return -1;
mmc = malloc(sizeof(struct mmc));
if (!mmc)
return -ENOMEM;
memset(mmc, 0, sizeof(struct mmc));
sprintf(mmc->name, "FSL_SDHC");
regs = (struct fsl_esdhc *)cfg->esdhc_base;
/* First reset the eSDHC controller */
esdhc_reset(regs);
esdhc_setbits32(&regs->sysctl, SYSCTL_PEREN | SYSCTL_HCKEN
| SYSCTL_IPGEN | SYSCTL_CKEN);
mmc->priv = cfg;
mmc->send_cmd = esdhc_send_cmd;
mmc->set_ios = esdhc_set_ios;
mmc->init = esdhc_init;
mmc->getcd = esdhc_getcd;
mmc->getwp = NULL;
voltage_caps = 0;
caps = regs->hostcapblt;
#ifdef CONFIG_SYS_FSL_ERRATUM_ESDHC135
caps = caps & ~(ESDHC_HOSTCAPBLT_SRS |
ESDHC_HOSTCAPBLT_VS18 | ESDHC_HOSTCAPBLT_VS30);
#endif
/* T4240 host controller capabilities register should have VS33 bit */
#ifdef CONFIG_SYS_FSL_MMC_HAS_CAPBLT_VS33
caps = caps | ESDHC_HOSTCAPBLT_VS33;
#endif
if (caps & ESDHC_HOSTCAPBLT_VS18)
voltage_caps |= MMC_VDD_165_195;
if (caps & ESDHC_HOSTCAPBLT_VS30)
voltage_caps |= MMC_VDD_29_30 | MMC_VDD_30_31;
if (caps & ESDHC_HOSTCAPBLT_VS33)
voltage_caps |= MMC_VDD_32_33 | MMC_VDD_33_34;
#ifdef CONFIG_SYS_SD_VOLTAGE
mmc->voltages = CONFIG_SYS_SD_VOLTAGE;
#else
mmc->voltages = MMC_VDD_32_33 | MMC_VDD_33_34;
#endif
if ((mmc->voltages & voltage_caps) == 0) {
printf("voltage not supported by controller\n");
return -1;
}
mmc->host_caps = MMC_MODE_4BIT | MMC_MODE_8BIT | MMC_MODE_HC;
if (cfg->max_bus_width > 0) {
if (cfg->max_bus_width < 8)
mmc->host_caps &= ~MMC_MODE_8BIT;
if (cfg->max_bus_width < 4)
mmc->host_caps &= ~MMC_MODE_4BIT;
}
if (caps & ESDHC_HOSTCAPBLT_HSS)
mmc->host_caps |= MMC_MODE_HS_52MHz | MMC_MODE_HS;
mmc->f_min = 400000;
mmc->f_max = MIN(gd->arch.sdhc_clk, 52000000);
mmc->b_max = 0;
mmc_register(mmc);
return 0;
}
int fsl_esdhc_mmc_init(bd_t *bis)
{
struct fsl_esdhc_cfg *cfg;
cfg = calloc(sizeof(struct fsl_esdhc_cfg), 1);
cfg->esdhc_base = CONFIG_SYS_FSL_ESDHC_ADDR;
cfg->sdhc_clk = gd->arch.sdhc_clk;
return fsl_esdhc_initialize(bis, cfg);
}
#ifdef CONFIG_OF_LIBFDT
void fdt_fixup_esdhc(void *blob, bd_t *bd)
{
const char *compat = "fsl,esdhc";
#ifdef CONFIG_FSL_ESDHC_PIN_MUX
if (!hwconfig("esdhc")) {
do_fixup_by_compat(blob, compat, "status", "disabled",
8 + 1, 1);
return;
}
#endif
do_fixup_by_compat_u32(blob, compat, "clock-frequency",
gd->arch.sdhc_clk, 1);
do_fixup_by_compat(blob, compat, "status", "okay",
4 + 1, 1);
}
#endif