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u-boot/drivers/mmc/mxsmmc.c
Tom Rini 83d290c56f SPDX: Convert all of our single license tags to Linux Kernel style 
When U-Boot started using SPDX tags we were among the early adopters and
there weren't a lot of other examples to borrow from.  So we picked the
area of the file that usually had a full license text and replaced it
with an appropriate SPDX-License-Identifier: entry.  Since then, the
Linux Kernel has adopted SPDX tags and they place it as the very first
line in a file (except where shebangs are used, then it's second line)
and with slightly different comment styles than us.

In part due to community overlap, in part due to better tag visibility
and in part for other minor reasons, switch over to that style.

This commit changes all instances where we have a single declared
license in the tag as both the before and after are identical in tag
contents.  There's also a few places where I found we did not have a tag
and have introduced one.

Signed-off-by: Tom Rini <trini@konsulko.com>
2018-05-07 09:34:12 -04:00

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// SPDX-License-Identifier: GPL-2.0+
/*
* 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
*/
#include <common.h>
#include <malloc.h>
#include <mmc.h>
#include <linux/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/mach-imx/dma.h>
#include <bouncebuf.h>
struct mxsmmc_priv {
int id;
struct mxs_ssp_regs *regs;
uint32_t buswidth;
int (*mmc_is_wp)(int);
int (*mmc_cd)(int);
struct mxs_dma_desc *desc;
struct mmc_config cfg; /* mmc configuration */
};
#define MXSMMC_MAX_TIMEOUT 10000
#define MXSMMC_SMALL_TRANSFER 512
static int mxsmmc_cd(struct mxsmmc_priv *priv)
{
struct mxs_ssp_regs *ssp_regs = priv->regs;
if (priv->mmc_cd)
return priv->mmc_cd(priv->id);
return !(readl(&ssp_regs->hw_ssp_status) & SSP_STATUS_CARD_DETECT);
}
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 : -ECOMM;
}
static int mxsmmc_send_cmd_dma(struct mxsmmc_priv *priv, struct mmc_data *data)
{
uint32_t data_count = data->blocksize * data->blocks;
int dmach;
struct mxs_dma_desc *desc = priv->desc;
void *addr;
unsigned int flags;
struct bounce_buffer bbstate;
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(&bbstate, addr, data_count, flags);
priv->desc->cmd.address = (dma_addr_t)bbstate.bounce_buffer;
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(&bbstate);
return -ECOMM;
}
bounce_buffer_stop(&bbstate);
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 = 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.devnum, 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.devnum);
return -ETIMEDOUT;
}
/* See if card is present */
if (!mxsmmc_cd(priv)) {
printf("MMC%d: No card detected!\n", mmc->block_dev.devnum);
return -ENOMEDIUM;
}
/* 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.devnum)) {
printf("MMC%d: Can not write a locked card!\n",
mmc->block_dev.devnum);
return -EOPNOTSUPP;
}
ctrl0 |= SSP_CTRL0_DATA_XFER;
reg = data->blocksize * data->blocks;
#if defined(CONFIG_MX23)
ctrl0 |= reg & SSP_CTRL0_XFER_COUNT_MASK;
clrsetbits_le32(&ssp_regs->hw_ssp_cmd0,
SSP_CMD0_BLOCK_SIZE_MASK | SSP_CMD0_BLOCK_COUNT_MASK,
((data->blocks - 1) << SSP_CMD0_BLOCK_COUNT_OFFSET) |
((ffs(data->blocksize) - 1) <<
SSP_CMD0_BLOCK_SIZE_OFFSET));
#elif defined(CONFIG_MX28)
writel(reg, &ssp_regs->hw_ssp_xfer_size);
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);
#endif
}
/* 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.devnum, cmd->cmdidx);
return -ETIMEDOUT;
}
/* Check command timeout */
if (reg & SSP_STATUS_RESP_TIMEOUT) {
printf("MMC%d: Command %d timeout (status 0x%08x)\n",
mmc->block_dev.devnum, cmd->cmdidx, reg);
return -ETIMEDOUT;
}
/* 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.devnum, cmd->cmdidx, reg);
return -ECOMM;
}
/* 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.devnum, 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.devnum);
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.devnum, cmd->cmdidx, reg);
return -ECOMM;
}
return 0;
}
static int mxsmmc_set_ios(struct mmc *mmc)
{
struct mxsmmc_priv *priv = mmc->priv;
struct mxs_ssp_regs *ssp_regs = priv->regs;
/* Set the clock speed */
if (mmc->clock)
mxs_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.devnum, mmc->bus_width);
return 0;
}
static int mxsmmc_init(struct mmc *mmc)
{
struct mxsmmc_priv *priv = mmc->priv;
struct mxs_ssp_regs *ssp_regs = priv->regs;
/* Reset SSP */
mxs_reset_block(&ssp_regs->hw_ssp_ctrl0_reg);
/* Reconfigure the SSP block for MMC operation */
writel(SSP_CTRL1_SSP_MODE_SD_MMC |
SSP_CTRL1_WORD_LENGTH_EIGHT_BITS |
SSP_CTRL1_DMA_ENABLE |
SSP_CTRL1_POLARITY |
SSP_CTRL1_RECV_TIMEOUT_IRQ_EN |
SSP_CTRL1_DATA_CRC_IRQ_EN |
SSP_CTRL1_DATA_TIMEOUT_IRQ_EN |
SSP_CTRL1_RESP_TIMEOUT_IRQ_EN |
SSP_CTRL1_RESP_ERR_IRQ_EN,
&ssp_regs->hw_ssp_ctrl1_set);
/* Set initial bit clock 400 KHz */
mxs_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;
}
static const struct mmc_ops mxsmmc_ops = {
.send_cmd = mxsmmc_send_cmd,
.set_ios = mxsmmc_set_ios,
.init = mxsmmc_init,
};
int mxsmmc_initialize(bd_t *bis, int id, int (*wp)(int), int (*cd)(int))
{
struct mmc *mmc = NULL;
struct mxsmmc_priv *priv = NULL;
int ret;
const unsigned int mxsmmc_clk_id = mxs_ssp_clock_by_bus(id);
if (!mxs_ssp_bus_id_valid(id))
return -ENODEV;
priv = malloc(sizeof(struct mxsmmc_priv));
if (!priv)
return -ENOMEM;
priv->desc = mxs_dma_desc_alloc();
if (!priv->desc) {
free(priv);
return -ENOMEM;
}
ret = mxs_dma_init_channel(MXS_DMA_CHANNEL_AHB_APBH_SSP0 + id);
if (ret)
return ret;
priv->mmc_is_wp = wp;
priv->mmc_cd = cd;
priv->id = id;
priv->regs = mxs_ssp_regs_by_bus(id);
priv->cfg.name = "MXS MMC";
priv->cfg.ops = &mxsmmc_ops;
priv->cfg.voltages = MMC_VDD_32_33 | MMC_VDD_33_34;
priv->cfg.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.
*/
priv->cfg.f_min = 400000;
priv->cfg.f_max = mxc_get_clock(MXC_SSP0_CLK + mxsmmc_clk_id) * 1000 / 2;
priv->cfg.b_max = 0x20;
mmc = mmc_create(&priv->cfg, priv);
if (mmc == NULL) {
mxs_dma_desc_free(priv->desc);
free(priv);
return -ENOMEM;
}
return 0;
}
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