u-boot/drivers/mmc/tegra_mmc.c

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/*
* (C) Copyright 2009 SAMSUNG Electronics
* Minkyu Kang <mk7.kang@samsung.com>
* Jaehoon Chung <jh80.chung@samsung.com>
* Portions Copyright 2011-2012 NVIDIA Corporation
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <bouncebuf.h>
#include <common.h>
#include <asm/gpio.h>
#include <asm/io.h>
#include <asm/arch/clock.h>
#include <asm/arch-tegra/clk_rst.h>
#include <asm/arch-tegra/tegra_mmc.h>
#include <mmc.h>
/* support 4 mmc hosts */
struct mmc mmc_dev[4];
struct mmc_host mmc_host[4];
/**
* Get the host address and peripheral ID for a device. Devices are numbered
* from 0 to 3.
*
* @param host Structure to fill in (base, reg, mmc_id)
* @param dev_index Device index (0-3)
*/
static void tegra_get_setup(struct mmc_host *host, int dev_index)
{
debug("tegra_get_setup: dev_index = %d\n", dev_index);
switch (dev_index) {
case 1:
host->base = TEGRA_SDMMC3_BASE;
host->mmc_id = PERIPH_ID_SDMMC3;
break;
case 2:
host->base = TEGRA_SDMMC2_BASE;
host->mmc_id = PERIPH_ID_SDMMC2;
break;
case 3:
host->base = TEGRA_SDMMC1_BASE;
host->mmc_id = PERIPH_ID_SDMMC1;
break;
case 0:
default:
host->base = TEGRA_SDMMC4_BASE;
host->mmc_id = PERIPH_ID_SDMMC4;
break;
}
host->reg = (struct tegra_mmc *)host->base;
}
static void mmc_prepare_data(struct mmc_host *host, struct mmc_data *data,
struct bounce_buffer *bbstate)
{
unsigned char ctrl;
debug("buf: %p (%p), data->blocks: %u, data->blocksize: %u\n",
bbstate->bounce_buffer, bbstate->user_buffer, data->blocks,
data->blocksize);
writel((u32)bbstate->bounce_buffer, &host->reg->sysad);
/*
* DMASEL[4:3]
* 00 = Selects SDMA
* 01 = Reserved
* 10 = Selects 32-bit Address ADMA2
* 11 = Selects 64-bit Address ADMA2
*/
ctrl = readb(&host->reg->hostctl);
ctrl &= ~TEGRA_MMC_HOSTCTL_DMASEL_MASK;
ctrl |= TEGRA_MMC_HOSTCTL_DMASEL_SDMA;
writeb(ctrl, &host->reg->hostctl);
/* We do not handle DMA boundaries, so set it to max (512 KiB) */
writew((7 << 12) | (data->blocksize & 0xFFF), &host->reg->blksize);
writew(data->blocks, &host->reg->blkcnt);
}
static void mmc_set_transfer_mode(struct mmc_host *host, struct mmc_data *data)
{
unsigned short mode;
debug(" mmc_set_transfer_mode called\n");
/*
* TRNMOD
* MUL1SIN0[5] : Multi/Single Block Select
* RD1WT0[4] : Data Transfer Direction Select
* 1 = read
* 0 = write
* ENACMD12[2] : Auto CMD12 Enable
* ENBLKCNT[1] : Block Count Enable
* ENDMA[0] : DMA Enable
*/
mode = (TEGRA_MMC_TRNMOD_DMA_ENABLE |
TEGRA_MMC_TRNMOD_BLOCK_COUNT_ENABLE);
if (data->blocks > 1)
mode |= TEGRA_MMC_TRNMOD_MULTI_BLOCK_SELECT;
if (data->flags & MMC_DATA_READ)
mode |= TEGRA_MMC_TRNMOD_DATA_XFER_DIR_SEL_READ;
writew(mode, &host->reg->trnmod);
}
static int mmc_wait_inhibit(struct mmc_host *host,
struct mmc_cmd *cmd,
struct mmc_data *data,
unsigned int timeout)
{
/*
* PRNSTS
* CMDINHDAT[1] : Command Inhibit (DAT)
* CMDINHCMD[0] : Command Inhibit (CMD)
*/
unsigned int mask = TEGRA_MMC_PRNSTS_CMD_INHIBIT_CMD;
/*
* We shouldn't wait for data inhibit for stop commands, even
* though they might use busy signaling
*/
if ((data == NULL) && (cmd->resp_type & MMC_RSP_BUSY))
mask |= TEGRA_MMC_PRNSTS_CMD_INHIBIT_DAT;
while (readl(&host->reg->prnsts) & mask) {
if (timeout == 0) {
printf("%s: timeout error\n", __func__);
return -1;
}
timeout--;
udelay(1000);
}
return 0;
}
static int mmc_send_cmd_bounced(struct mmc *mmc, struct mmc_cmd *cmd,
struct mmc_data *data, struct bounce_buffer *bbstate)
{
struct mmc_host *host = (struct mmc_host *)mmc->priv;
int flags, i;
int result;
unsigned int mask = 0;
unsigned int retry = 0x100000;
debug(" mmc_send_cmd called\n");
result = mmc_wait_inhibit(host, cmd, data, 10 /* ms */);
if (result < 0)
return result;
if (data)
mmc_prepare_data(host, data, bbstate);
debug("cmd->arg: %08x\n", cmd->cmdarg);
writel(cmd->cmdarg, &host->reg->argument);
if (data)
mmc_set_transfer_mode(host, data);
if ((cmd->resp_type & MMC_RSP_136) && (cmd->resp_type & MMC_RSP_BUSY))
return -1;
/*
* CMDREG
* CMDIDX[13:8] : Command index
* DATAPRNT[5] : Data Present Select
* ENCMDIDX[4] : Command Index Check Enable
* ENCMDCRC[3] : Command CRC Check Enable
* RSPTYP[1:0]
* 00 = No Response
* 01 = Length 136
* 10 = Length 48
* 11 = Length 48 Check busy after response
*/
if (!(cmd->resp_type & MMC_RSP_PRESENT))
flags = TEGRA_MMC_CMDREG_RESP_TYPE_SELECT_NO_RESPONSE;
else if (cmd->resp_type & MMC_RSP_136)
flags = TEGRA_MMC_CMDREG_RESP_TYPE_SELECT_LENGTH_136;
else if (cmd->resp_type & MMC_RSP_BUSY)
flags = TEGRA_MMC_CMDREG_RESP_TYPE_SELECT_LENGTH_48_BUSY;
else
flags = TEGRA_MMC_CMDREG_RESP_TYPE_SELECT_LENGTH_48;
if (cmd->resp_type & MMC_RSP_CRC)
flags |= TEGRA_MMC_TRNMOD_CMD_CRC_CHECK;
if (cmd->resp_type & MMC_RSP_OPCODE)
flags |= TEGRA_MMC_TRNMOD_CMD_INDEX_CHECK;
if (data)
flags |= TEGRA_MMC_TRNMOD_DATA_PRESENT_SELECT_DATA_TRANSFER;
debug("cmd: %d\n", cmd->cmdidx);
writew((cmd->cmdidx << 8) | flags, &host->reg->cmdreg);
for (i = 0; i < retry; i++) {
mask = readl(&host->reg->norintsts);
/* Command Complete */
if (mask & TEGRA_MMC_NORINTSTS_CMD_COMPLETE) {
if (!data)
writel(mask, &host->reg->norintsts);
break;
}
}
if (i == retry) {
printf("%s: waiting for status update\n", __func__);
writel(mask, &host->reg->norintsts);
return TIMEOUT;
}
if (mask & TEGRA_MMC_NORINTSTS_CMD_TIMEOUT) {
/* Timeout Error */
debug("timeout: %08x cmd %d\n", mask, cmd->cmdidx);
writel(mask, &host->reg->norintsts);
return TIMEOUT;
} else if (mask & TEGRA_MMC_NORINTSTS_ERR_INTERRUPT) {
/* Error Interrupt */
debug("error: %08x cmd %d\n", mask, cmd->cmdidx);
writel(mask, &host->reg->norintsts);
return -1;
}
if (cmd->resp_type & MMC_RSP_PRESENT) {
if (cmd->resp_type & MMC_RSP_136) {
/* CRC is stripped so we need to do some shifting. */
for (i = 0; i < 4; i++) {
unsigned int offset =
(unsigned int)(&host->reg->rspreg3 - i);
cmd->response[i] = readl(offset) << 8;
if (i != 3) {
cmd->response[i] |=
readb(offset - 1);
}
debug("cmd->resp[%d]: %08x\n",
i, cmd->response[i]);
}
} else if (cmd->resp_type & MMC_RSP_BUSY) {
for (i = 0; i < retry; i++) {
/* PRNTDATA[23:20] : DAT[3:0] Line Signal */
if (readl(&host->reg->prnsts)
& (1 << 20)) /* DAT[0] */
break;
}
if (i == retry) {
printf("%s: card is still busy\n", __func__);
writel(mask, &host->reg->norintsts);
return TIMEOUT;
}
cmd->response[0] = readl(&host->reg->rspreg0);
debug("cmd->resp[0]: %08x\n", cmd->response[0]);
} else {
cmd->response[0] = readl(&host->reg->rspreg0);
debug("cmd->resp[0]: %08x\n", cmd->response[0]);
}
}
if (data) {
unsigned long start = get_timer(0);
while (1) {
mask = readl(&host->reg->norintsts);
if (mask & TEGRA_MMC_NORINTSTS_ERR_INTERRUPT) {
/* Error Interrupt */
writel(mask, &host->reg->norintsts);
printf("%s: error during transfer: 0x%08x\n",
__func__, mask);
return -1;
} else if (mask & TEGRA_MMC_NORINTSTS_DMA_INTERRUPT) {
/*
* DMA Interrupt, restart the transfer where
* it was interrupted.
*/
unsigned int address = readl(&host->reg->sysad);
debug("DMA end\n");
writel(TEGRA_MMC_NORINTSTS_DMA_INTERRUPT,
&host->reg->norintsts);
writel(address, &host->reg->sysad);
} else if (mask & TEGRA_MMC_NORINTSTS_XFER_COMPLETE) {
/* Transfer Complete */
debug("r/w is done\n");
break;
} else if (get_timer(start) > 2000UL) {
writel(mask, &host->reg->norintsts);
printf("%s: MMC Timeout\n"
" Interrupt status 0x%08x\n"
" Interrupt status enable 0x%08x\n"
" Interrupt signal enable 0x%08x\n"
" Present status 0x%08x\n",
__func__, mask,
readl(&host->reg->norintstsen),
readl(&host->reg->norintsigen),
readl(&host->reg->prnsts));
return -1;
}
}
writel(mask, &host->reg->norintsts);
}
udelay(1000);
return 0;
}
static int mmc_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd,
struct mmc_data *data)
{
void *buf;
unsigned int bbflags;
size_t len;
struct bounce_buffer bbstate;
int ret;
if (data) {
if (data->flags & MMC_DATA_READ) {
buf = data->dest;
bbflags = GEN_BB_WRITE;
} else {
buf = (void *)data->src;
bbflags = GEN_BB_READ;
}
len = data->blocks * data->blocksize;
bounce_buffer_start(&bbstate, buf, len, bbflags);
}
ret = mmc_send_cmd_bounced(mmc, cmd, data, &bbstate);
if (data)
bounce_buffer_stop(&bbstate);
return ret;
}
static void mmc_change_clock(struct mmc_host *host, uint clock)
{
int div;
unsigned short clk;
unsigned long timeout;
debug(" mmc_change_clock called\n");
/*
* Change Tegra SDMMCx clock divisor here. Source is 216MHz,
* PLLP_OUT0
*/
if (clock == 0)
goto out;
clock_adjust_periph_pll_div(host->mmc_id, CLOCK_ID_PERIPH, clock,
&div);
debug("div = %d\n", div);
writew(0, &host->reg->clkcon);
/*
* CLKCON
* SELFREQ[15:8] : base clock divided by value
* ENSDCLK[2] : SD Clock Enable
* STBLINTCLK[1] : Internal Clock Stable
* ENINTCLK[0] : Internal Clock Enable
*/
div >>= 1;
clk = ((div << TEGRA_MMC_CLKCON_SDCLK_FREQ_SEL_SHIFT) |
TEGRA_MMC_CLKCON_INTERNAL_CLOCK_ENABLE);
writew(clk, &host->reg->clkcon);
/* Wait max 10 ms */
timeout = 10;
while (!(readw(&host->reg->clkcon) &
TEGRA_MMC_CLKCON_INTERNAL_CLOCK_STABLE)) {
if (timeout == 0) {
printf("%s: timeout error\n", __func__);
return;
}
timeout--;
udelay(1000);
}
clk |= TEGRA_MMC_CLKCON_SD_CLOCK_ENABLE;
writew(clk, &host->reg->clkcon);
debug("mmc_change_clock: clkcon = %08X\n", clk);
out:
host->clock = clock;
}
static void mmc_set_ios(struct mmc *mmc)
{
struct mmc_host *host = mmc->priv;
unsigned char ctrl;
debug(" mmc_set_ios called\n");
debug("bus_width: %x, clock: %d\n", mmc->bus_width, mmc->clock);
/* Change clock first */
mmc_change_clock(host, mmc->clock);
ctrl = readb(&host->reg->hostctl);
/*
* WIDE8[5]
* 0 = Depend on WIDE4
* 1 = 8-bit mode
* WIDE4[1]
* 1 = 4-bit mode
* 0 = 1-bit mode
*/
if (mmc->bus_width == 8)
ctrl |= (1 << 5);
else if (mmc->bus_width == 4)
ctrl |= (1 << 1);
else
ctrl &= ~(1 << 1);
writeb(ctrl, &host->reg->hostctl);
debug("mmc_set_ios: hostctl = %08X\n", ctrl);
}
static void mmc_reset(struct mmc_host *host)
{
unsigned int timeout;
debug(" mmc_reset called\n");
/*
* RSTALL[0] : Software reset for all
* 1 = reset
* 0 = work
*/
writeb(TEGRA_MMC_SWRST_SW_RESET_FOR_ALL, &host->reg->swrst);
host->clock = 0;
/* Wait max 100 ms */
timeout = 100;
/* hw clears the bit when it's done */
while (readb(&host->reg->swrst) & TEGRA_MMC_SWRST_SW_RESET_FOR_ALL) {
if (timeout == 0) {
printf("%s: timeout error\n", __func__);
return;
}
timeout--;
udelay(1000);
}
}
static int mmc_core_init(struct mmc *mmc)
{
struct mmc_host *host = (struct mmc_host *)mmc->priv;
unsigned int mask;
debug(" mmc_core_init called\n");
mmc_reset(host);
host->version = readw(&host->reg->hcver);
debug("host version = %x\n", host->version);
/* mask all */
writel(0xffffffff, &host->reg->norintstsen);
writel(0xffffffff, &host->reg->norintsigen);
writeb(0xe, &host->reg->timeoutcon); /* TMCLK * 2^27 */
/*
* NORMAL Interrupt Status Enable Register init
* [5] ENSTABUFRDRDY : Buffer Read Ready Status Enable
* [4] ENSTABUFWTRDY : Buffer write Ready Status Enable
* [3] ENSTADMAINT : DMA boundary interrupt
* [1] ENSTASTANSCMPLT : Transfre Complete Status Enable
* [0] ENSTACMDCMPLT : Command Complete Status Enable
*/
mask = readl(&host->reg->norintstsen);
mask &= ~(0xffff);
mask |= (TEGRA_MMC_NORINTSTSEN_CMD_COMPLETE |
TEGRA_MMC_NORINTSTSEN_XFER_COMPLETE |
TEGRA_MMC_NORINTSTSEN_DMA_INTERRUPT |
TEGRA_MMC_NORINTSTSEN_BUFFER_WRITE_READY |
TEGRA_MMC_NORINTSTSEN_BUFFER_READ_READY);
writel(mask, &host->reg->norintstsen);
/*
* NORMAL Interrupt Signal Enable Register init
* [1] ENSTACMDCMPLT : Transfer Complete Signal Enable
*/
mask = readl(&host->reg->norintsigen);
mask &= ~(0xffff);
mask |= TEGRA_MMC_NORINTSIGEN_XFER_COMPLETE;
writel(mask, &host->reg->norintsigen);
return 0;
}
int tegra_mmc_getcd(struct mmc *mmc)
{
struct mmc_host *host = (struct mmc_host *)mmc->priv;
debug("tegra_mmc_getcd called\n");
if (host->cd_gpio >= 0)
return !gpio_get_value(host->cd_gpio);
return 1;
}
int tegra_mmc_init(int dev_index, int bus_width, int pwr_gpio, int cd_gpio)
{
struct mmc_host *host;
char gpusage[12]; /* "SD/MMCn PWR" or "SD/MMCn CD" */
struct mmc *mmc;
debug(" tegra_mmc_init: index %d, bus width %d "
"pwr_gpio %d cd_gpio %d\n",
dev_index, bus_width, pwr_gpio, cd_gpio);
host = &mmc_host[dev_index];
host->clock = 0;
host->pwr_gpio = pwr_gpio;
host->cd_gpio = cd_gpio;
tegra_get_setup(host, dev_index);
clock_start_periph_pll(host->mmc_id, CLOCK_ID_PERIPH, 20000000);
if (host->pwr_gpio >= 0) {
sprintf(gpusage, "SD/MMC%d PWR", dev_index);
gpio_request(host->pwr_gpio, gpusage);
gpio_direction_output(host->pwr_gpio, 1);
}
if (host->cd_gpio >= 0) {
sprintf(gpusage, "SD/MMC%d CD", dev_index);
gpio_request(host->cd_gpio, gpusage);
gpio_direction_input(host->cd_gpio);
}
mmc = &mmc_dev[dev_index];
sprintf(mmc->name, "Tegra SD/MMC");
mmc->priv = host;
mmc->send_cmd = mmc_send_cmd;
mmc->set_ios = mmc_set_ios;
mmc->init = mmc_core_init;
mmc->getcd = tegra_mmc_getcd;
mmc->voltages = MMC_VDD_32_33 | MMC_VDD_33_34 | MMC_VDD_165_195;
mmc->host_caps = 0;
if (bus_width == 8)
mmc->host_caps |= MMC_MODE_8BIT;
if (bus_width >= 4)
mmc->host_caps |= MMC_MODE_4BIT;
mmc->host_caps |= MMC_MODE_HS_52MHz | MMC_MODE_HS | MMC_MODE_HC;
/*
* min freq is for card identification, and is the highest
* low-speed SDIO card frequency (actually 400KHz)
* max freq is highest HS eMMC clock as per the SD/MMC spec
* (actually 52MHz)
* Both of these are the closest equivalents w/216MHz source
* clock and Tegra SDMMC divisors.
*/
mmc->f_min = 375000;
mmc->f_max = 48000000;
mmc_register(mmc);
return 0;
}