u-boot/drivers/mmc/mxsmmc.c
Marek Vasut 4e6d81d1a4 MMC: MXS: Convert MXS MMC driver to generic bounce buffer
Implement necessary code to use the generic bounce buffer routines
inside this driver. This replaces the MMC bounce buffer, which is
to be removed.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Fabio Estevam <festevam@gmail.com>
Cc: Andy Fleming <afleming@freescale.com>
Signed-off-by: Andy Fleming <afleming@freescale.com>
2012-10-22 02:53:35 -05:00

450 lines
12 KiB
C

/*
* Freescale i.MX28 SSP MMC driver
*
* Copyright (C) 2011 Marek Vasut <marek.vasut@gmail.com>
* on behalf of DENX Software Engineering GmbH
*
* Based on code from LTIB:
* (C) Copyright 2008-2010 Freescale Semiconductor, Inc.
* Terry Lv
*
* Copyright 2007, Freescale Semiconductor, Inc
* Andy Fleming
*
* Based vaguely on the pxa mmc code:
* (C) Copyright 2003
* Kyle Harris, Nexus Technologies, Inc. kharris@nexus-tech.net
*
* See file CREDITS for list of people who contributed to this
* project.
*
* 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 <common.h>
#include <malloc.h>
#include <mmc.h>
#include <asm/errno.h>
#include <asm/io.h>
#include <asm/arch/clock.h>
#include <asm/arch/imx-regs.h>
#include <asm/arch/sys_proto.h>
#include <asm/arch/dma.h>
#include <bouncebuf.h>
struct mxsmmc_priv {
int id;
struct mxs_ssp_regs *regs;
uint32_t clkseq_bypass;
uint32_t *clkctrl_ssp;
uint32_t buswidth;
int (*mmc_is_wp)(int);
struct mxs_dma_desc *desc;
};
#define MXSMMC_MAX_TIMEOUT 10000
#define MXSMMC_SMALL_TRANSFER 512
static int mxsmmc_send_cmd_pio(struct mxsmmc_priv *priv, struct mmc_data *data)
{
struct mxs_ssp_regs *ssp_regs = priv->regs;
uint32_t *data_ptr;
int timeout = MXSMMC_MAX_TIMEOUT;
uint32_t reg;
uint32_t data_count = data->blocksize * data->blocks;
if (data->flags & MMC_DATA_READ) {
data_ptr = (uint32_t *)data->dest;
while (data_count && --timeout) {
reg = readl(&ssp_regs->hw_ssp_status);
if (!(reg & SSP_STATUS_FIFO_EMPTY)) {
*data_ptr++ = readl(&ssp_regs->hw_ssp_data);
data_count -= 4;
timeout = MXSMMC_MAX_TIMEOUT;
} else
udelay(1000);
}
} else {
data_ptr = (uint32_t *)data->src;
timeout *= 100;
while (data_count && --timeout) {
reg = readl(&ssp_regs->hw_ssp_status);
if (!(reg & SSP_STATUS_FIFO_FULL)) {
writel(*data_ptr++, &ssp_regs->hw_ssp_data);
data_count -= 4;
timeout = MXSMMC_MAX_TIMEOUT;
} else
udelay(1000);
}
}
return timeout ? 0 : COMM_ERR;
}
static int mxsmmc_send_cmd_dma(struct mxsmmc_priv *priv, struct mmc_data *data)
{
uint32_t data_count = data->blocksize * data->blocks;
uint32_t cache_data_count = roundup(data_count, ARCH_DMA_MINALIGN);
int dmach;
struct mxs_dma_desc *desc = priv->desc;
void *addr, *backup;
uint8_t flags;
memset(desc, 0, sizeof(struct mxs_dma_desc));
desc->address = (dma_addr_t)desc;
if (data->flags & MMC_DATA_READ) {
priv->desc->cmd.data = MXS_DMA_DESC_COMMAND_DMA_WRITE;
addr = data->dest;
flags = GEN_BB_WRITE;
} else {
priv->desc->cmd.data = MXS_DMA_DESC_COMMAND_DMA_READ;
addr = (void *)data->src;
flags = GEN_BB_READ;
}
bounce_buffer_start(&addr, data_count, &backup, flags);
priv->desc->cmd.address = (dma_addr_t)addr;
if (data->flags & MMC_DATA_WRITE) {
/* Flush data to DRAM so DMA can pick them up */
flush_dcache_range((uint32_t)addr,
(uint32_t)(addr) + cache_data_count);
}
/* Invalidate the area, so no writeback into the RAM races with DMA */
invalidate_dcache_range((uint32_t)priv->desc->cmd.address,
(uint32_t)(priv->desc->cmd.address + cache_data_count));
priv->desc->cmd.data |= MXS_DMA_DESC_IRQ | MXS_DMA_DESC_DEC_SEM |
(data_count << MXS_DMA_DESC_BYTES_OFFSET);
dmach = MXS_DMA_CHANNEL_AHB_APBH_SSP0 + priv->id;
mxs_dma_desc_append(dmach, priv->desc);
if (mxs_dma_go(dmach)) {
bounce_buffer_stop(&addr, data_count, &backup, flags);
return COMM_ERR;
}
/* The data arrived into DRAM, invalidate cache over them */
if (data->flags & MMC_DATA_READ) {
invalidate_dcache_range((uint32_t)addr,
(uint32_t)(addr) + cache_data_count);
}
bounce_buffer_stop(&addr, data_count, &backup, flags);
return 0;
}
/*
* Sends a command out on the bus. Takes the mmc pointer,
* a command pointer, and an optional data pointer.
*/
static int
mxsmmc_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd, struct mmc_data *data)
{
struct mxsmmc_priv *priv = (struct mxsmmc_priv *)mmc->priv;
struct mxs_ssp_regs *ssp_regs = priv->regs;
uint32_t reg;
int timeout;
uint32_t ctrl0;
int ret;
debug("MMC%d: CMD%d\n", mmc->block_dev.dev, cmd->cmdidx);
/* Check bus busy */
timeout = MXSMMC_MAX_TIMEOUT;
while (--timeout) {
udelay(1000);
reg = readl(&ssp_regs->hw_ssp_status);
if (!(reg &
(SSP_STATUS_BUSY | SSP_STATUS_DATA_BUSY |
SSP_STATUS_CMD_BUSY))) {
break;
}
}
if (!timeout) {
printf("MMC%d: Bus busy timeout!\n", mmc->block_dev.dev);
return TIMEOUT;
}
/* See if card is present */
if (readl(&ssp_regs->hw_ssp_status) & SSP_STATUS_CARD_DETECT) {
printf("MMC%d: No card detected!\n", mmc->block_dev.dev);
return NO_CARD_ERR;
}
/* Start building CTRL0 contents */
ctrl0 = priv->buswidth;
/* Set up command */
if (!(cmd->resp_type & MMC_RSP_CRC))
ctrl0 |= SSP_CTRL0_IGNORE_CRC;
if (cmd->resp_type & MMC_RSP_PRESENT) /* Need to get response */
ctrl0 |= SSP_CTRL0_GET_RESP;
if (cmd->resp_type & MMC_RSP_136) /* It's a 136 bits response */
ctrl0 |= SSP_CTRL0_LONG_RESP;
if (data && (data->blocksize * data->blocks < MXSMMC_SMALL_TRANSFER))
writel(SSP_CTRL1_DMA_ENABLE, &ssp_regs->hw_ssp_ctrl1_clr);
else
writel(SSP_CTRL1_DMA_ENABLE, &ssp_regs->hw_ssp_ctrl1_set);
/* Command index */
reg = readl(&ssp_regs->hw_ssp_cmd0);
reg &= ~(SSP_CMD0_CMD_MASK | SSP_CMD0_APPEND_8CYC);
reg |= cmd->cmdidx << SSP_CMD0_CMD_OFFSET;
if (cmd->cmdidx == MMC_CMD_STOP_TRANSMISSION)
reg |= SSP_CMD0_APPEND_8CYC;
writel(reg, &ssp_regs->hw_ssp_cmd0);
/* Command argument */
writel(cmd->cmdarg, &ssp_regs->hw_ssp_cmd1);
/* Set up data */
if (data) {
/* READ or WRITE */
if (data->flags & MMC_DATA_READ) {
ctrl0 |= SSP_CTRL0_READ;
} else if (priv->mmc_is_wp &&
priv->mmc_is_wp(mmc->block_dev.dev)) {
printf("MMC%d: Can not write a locked card!\n",
mmc->block_dev.dev);
return UNUSABLE_ERR;
}
ctrl0 |= SSP_CTRL0_DATA_XFER;
reg = ((data->blocks - 1) <<
SSP_BLOCK_SIZE_BLOCK_COUNT_OFFSET) |
((ffs(data->blocksize) - 1) <<
SSP_BLOCK_SIZE_BLOCK_SIZE_OFFSET);
writel(reg, &ssp_regs->hw_ssp_block_size);
reg = data->blocksize * data->blocks;
writel(reg, &ssp_regs->hw_ssp_xfer_size);
}
/* Kick off the command */
ctrl0 |= SSP_CTRL0_WAIT_FOR_IRQ | SSP_CTRL0_ENABLE | SSP_CTRL0_RUN;
writel(ctrl0, &ssp_regs->hw_ssp_ctrl0);
/* Wait for the command to complete */
timeout = MXSMMC_MAX_TIMEOUT;
while (--timeout) {
udelay(1000);
reg = readl(&ssp_regs->hw_ssp_status);
if (!(reg & SSP_STATUS_CMD_BUSY))
break;
}
if (!timeout) {
printf("MMC%d: Command %d busy\n",
mmc->block_dev.dev, cmd->cmdidx);
return TIMEOUT;
}
/* Check command timeout */
if (reg & SSP_STATUS_RESP_TIMEOUT) {
printf("MMC%d: Command %d timeout (status 0x%08x)\n",
mmc->block_dev.dev, cmd->cmdidx, reg);
return TIMEOUT;
}
/* Check command errors */
if (reg & (SSP_STATUS_RESP_CRC_ERR | SSP_STATUS_RESP_ERR)) {
printf("MMC%d: Command %d error (status 0x%08x)!\n",
mmc->block_dev.dev, cmd->cmdidx, reg);
return COMM_ERR;
}
/* Copy response to response buffer */
if (cmd->resp_type & MMC_RSP_136) {
cmd->response[3] = readl(&ssp_regs->hw_ssp_sdresp0);
cmd->response[2] = readl(&ssp_regs->hw_ssp_sdresp1);
cmd->response[1] = readl(&ssp_regs->hw_ssp_sdresp2);
cmd->response[0] = readl(&ssp_regs->hw_ssp_sdresp3);
} else
cmd->response[0] = readl(&ssp_regs->hw_ssp_sdresp0);
/* Return if no data to process */
if (!data)
return 0;
if (data->blocksize * data->blocks < MXSMMC_SMALL_TRANSFER) {
ret = mxsmmc_send_cmd_pio(priv, data);
if (ret) {
printf("MMC%d: Data timeout with command %d "
"(status 0x%08x)!\n",
mmc->block_dev.dev, cmd->cmdidx, reg);
return ret;
}
} else {
ret = mxsmmc_send_cmd_dma(priv, data);
if (ret) {
printf("MMC%d: DMA transfer failed\n",
mmc->block_dev.dev);
return ret;
}
}
/* Check data errors */
reg = readl(&ssp_regs->hw_ssp_status);
if (reg &
(SSP_STATUS_TIMEOUT | SSP_STATUS_DATA_CRC_ERR |
SSP_STATUS_FIFO_OVRFLW | SSP_STATUS_FIFO_UNDRFLW)) {
printf("MMC%d: Data error with command %d (status 0x%08x)!\n",
mmc->block_dev.dev, cmd->cmdidx, reg);
return COMM_ERR;
}
return 0;
}
static void mxsmmc_set_ios(struct mmc *mmc)
{
struct mxsmmc_priv *priv = (struct mxsmmc_priv *)mmc->priv;
struct mxs_ssp_regs *ssp_regs = priv->regs;
/* Set the clock speed */
if (mmc->clock)
mx28_set_ssp_busclock(priv->id, mmc->clock / 1000);
switch (mmc->bus_width) {
case 1:
priv->buswidth = SSP_CTRL0_BUS_WIDTH_ONE_BIT;
break;
case 4:
priv->buswidth = SSP_CTRL0_BUS_WIDTH_FOUR_BIT;
break;
case 8:
priv->buswidth = SSP_CTRL0_BUS_WIDTH_EIGHT_BIT;
break;
}
/* Set the bus width */
clrsetbits_le32(&ssp_regs->hw_ssp_ctrl0,
SSP_CTRL0_BUS_WIDTH_MASK, priv->buswidth);
debug("MMC%d: Set %d bits bus width\n",
mmc->block_dev.dev, mmc->bus_width);
}
static int mxsmmc_init(struct mmc *mmc)
{
struct mxsmmc_priv *priv = (struct mxsmmc_priv *)mmc->priv;
struct mxs_ssp_regs *ssp_regs = priv->regs;
/* Reset SSP */
mxs_reset_block(&ssp_regs->hw_ssp_ctrl0_reg);
/* 8 bits word length in MMC mode */
clrsetbits_le32(&ssp_regs->hw_ssp_ctrl1,
SSP_CTRL1_SSP_MODE_MASK | SSP_CTRL1_WORD_LENGTH_MASK |
SSP_CTRL1_DMA_ENABLE,
SSP_CTRL1_SSP_MODE_SD_MMC | SSP_CTRL1_WORD_LENGTH_EIGHT_BITS);
/* Set initial bit clock 400 KHz */
mx28_set_ssp_busclock(priv->id, 400);
/* Send initial 74 clock cycles (185 us @ 400 KHz)*/
writel(SSP_CMD0_CONT_CLKING_EN, &ssp_regs->hw_ssp_cmd0_set);
udelay(200);
writel(SSP_CMD0_CONT_CLKING_EN, &ssp_regs->hw_ssp_cmd0_clr);
return 0;
}
int mxsmmc_initialize(bd_t *bis, int id, int (*wp)(int))
{
struct mxs_clkctrl_regs *clkctrl_regs =
(struct mxs_clkctrl_regs *)MXS_CLKCTRL_BASE;
struct mmc *mmc = NULL;
struct mxsmmc_priv *priv = NULL;
int ret;
mmc = malloc(sizeof(struct mmc));
if (!mmc)
return -ENOMEM;
priv = malloc(sizeof(struct mxsmmc_priv));
if (!priv) {
free(mmc);
return -ENOMEM;
}
priv->desc = mxs_dma_desc_alloc();
if (!priv->desc) {
free(priv);
free(mmc);
return -ENOMEM;
}
ret = mxs_dma_init_channel(id);
if (ret)
return ret;
priv->mmc_is_wp = wp;
priv->id = id;
switch (id) {
case 0:
priv->regs = (struct mxs_ssp_regs *)MXS_SSP0_BASE;
priv->clkseq_bypass = CLKCTRL_CLKSEQ_BYPASS_SSP0;
priv->clkctrl_ssp = &clkctrl_regs->hw_clkctrl_ssp0;
break;
case 1:
priv->regs = (struct mxs_ssp_regs *)MXS_SSP1_BASE;
priv->clkseq_bypass = CLKCTRL_CLKSEQ_BYPASS_SSP1;
priv->clkctrl_ssp = &clkctrl_regs->hw_clkctrl_ssp1;
break;
case 2:
priv->regs = (struct mxs_ssp_regs *)MXS_SSP2_BASE;
priv->clkseq_bypass = CLKCTRL_CLKSEQ_BYPASS_SSP2;
priv->clkctrl_ssp = &clkctrl_regs->hw_clkctrl_ssp2;
break;
case 3:
priv->regs = (struct mxs_ssp_regs *)MXS_SSP3_BASE;
priv->clkseq_bypass = CLKCTRL_CLKSEQ_BYPASS_SSP3;
priv->clkctrl_ssp = &clkctrl_regs->hw_clkctrl_ssp3;
break;
}
sprintf(mmc->name, "MXS MMC");
mmc->send_cmd = mxsmmc_send_cmd;
mmc->set_ios = mxsmmc_set_ios;
mmc->init = mxsmmc_init;
mmc->getcd = NULL;
mmc->priv = priv;
mmc->voltages = MMC_VDD_32_33 | MMC_VDD_33_34;
mmc->host_caps = MMC_MODE_4BIT | MMC_MODE_8BIT |
MMC_MODE_HS_52MHz | MMC_MODE_HS;
/*
* SSPCLK = 480 * 18 / 29 / 1 = 297.731 MHz
* SSP bit rate = SSPCLK / (CLOCK_DIVIDE * (1 + CLOCK_RATE)),
* CLOCK_DIVIDE has to be an even value from 2 to 254, and
* CLOCK_RATE could be any integer from 0 to 255.
*/
mmc->f_min = 400000;
mmc->f_max = mxc_get_clock(MXC_SSP0_CLK + id) * 1000 / 2;
mmc->b_max = 0x20;
mmc_register(mmc);
return 0;
}