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u-boot/drivers/mmc/davinci_mmc.c
Walter Lozano e3e2470fdd drivers: rename drivers to match compatible string 
When using OF_PLATDATA, the bind process between devices and drivers
is performed trying to match compatible string with driver names.
However driver names are not strictly defined, and also there are different
names used when declaring a driver with U_BOOT_DRIVER, the name of the
symbol used in the linker list and the used in the struct driver_info.

In order to make things a bit more clear, rename the drivers names. This
will also help for further OF_PLATDATA improvements, such as checking
for valid driver names.

Signed-off-by: Walter Lozano <walter.lozano@collabora.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Add a fix for sandbox of-platdata to avoid using an invalid ANSI colour:
Signed-off-by: Simon Glass <sjg@chromium.org>
2020-07-09 18:57:22 -06:00

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// SPDX-License-Identifier: GPL-2.0+
/*
* Davinci MMC Controller Driver
*
* Copyright (C) 2010 Texas Instruments Incorporated
*/
#include <config.h>
#include <common.h>
#include <dm.h>
#include <errno.h>
#include <mmc.h>
#include <command.h>
#include <part.h>
#include <malloc.h>
#include <asm/io.h>
#include <asm/arch/sdmmc_defs.h>
#include <asm-generic/gpio.h>
#include <linux/delay.h>
#define WATCHDOG_COUNT (100000)
#define get_val(addr) REG(addr)
#define set_val(addr, val) REG(addr) = (val)
#define set_bit(addr, val) set_val((addr), (get_val(addr) | (val)))
#define clear_bit(addr, val) set_val((addr), (get_val(addr) & ~(val)))
#ifdef CONFIG_DM_MMC
/* Davinci MMC board definitions */
struct davinci_mmc_priv {
struct davinci_mmc_regs *reg_base; /* Register base address */
uint input_clk; /* Input clock to MMC controller */
struct gpio_desc cd_gpio; /* Card Detect GPIO */
struct gpio_desc wp_gpio; /* Write Protect GPIO */
};
#endif
/* Set davinci clock prescalar value based on the required clock in HZ */
#if !CONFIG_IS_ENABLED(DM_MMC)
static void dmmc_set_clock(struct mmc *mmc, uint clock)
{
struct davinci_mmc *host = mmc->priv;
#else
static void davinci_mmc_set_clock(struct udevice *dev, uint clock)
{
struct davinci_mmc_priv *host = dev_get_priv(dev);
struct mmc *mmc = mmc_get_mmc_dev(dev);
#endif
struct davinci_mmc_regs *regs = host->reg_base;
uint clkrt, sysclk2, act_clock;
if (clock < mmc->cfg->f_min)
clock = mmc->cfg->f_min;
if (clock > mmc->cfg->f_max)
clock = mmc->cfg->f_max;
set_val(&regs->mmcclk, 0);
sysclk2 = host->input_clk;
clkrt = (sysclk2 / (2 * clock)) - 1;
/* Calculate the actual clock for the divider used */
act_clock = (sysclk2 / (2 * (clkrt + 1)));
/* Adjust divider if actual clock exceeds the required clock */
if (act_clock > clock)
clkrt++;
/* check clock divider boundary and correct it */
if (clkrt > 0xFF)
clkrt = 0xFF;
set_val(&regs->mmcclk, (clkrt | MMCCLK_CLKEN));
}
/* Status bit wait loop for MMCST1 */
static int
dmmc_wait_fifo_status(volatile struct davinci_mmc_regs *regs, uint status)
{
uint wdog = WATCHDOG_COUNT;
while (--wdog && ((get_val(&regs->mmcst1) & status) != status))
udelay(10);
if (!(get_val(&regs->mmcctl) & MMCCTL_WIDTH_4_BIT))
udelay(100);
if (wdog == 0)
return -ECOMM;
return 0;
}
/* Busy bit wait loop for MMCST1 */
static int dmmc_busy_wait(volatile struct davinci_mmc_regs *regs)
{
uint wdog = WATCHDOG_COUNT;
while (--wdog && (get_val(&regs->mmcst1) & MMCST1_BUSY))
udelay(10);
if (wdog == 0)
return -ECOMM;
return 0;
}
/* Status bit wait loop for MMCST0 - Checks for error bits as well */
static int dmmc_check_status(volatile struct davinci_mmc_regs *regs,
uint *cur_st, uint st_ready, uint st_error)
{
uint wdog = WATCHDOG_COUNT;
uint mmcstatus = *cur_st;
while (wdog--) {
if (mmcstatus & st_ready) {
*cur_st = mmcstatus;
mmcstatus = get_val(&regs->mmcst1);
return 0;
} else if (mmcstatus & st_error) {
if (mmcstatus & MMCST0_TOUTRS)
return -ETIMEDOUT;
printf("[ ST0 ERROR %x]\n", mmcstatus);
/*
* Ignore CRC errors as some MMC cards fail to
* initialize on DM365-EVM on the SD1 slot
*/
if (mmcstatus & MMCST0_CRCRS)
return 0;
return -ECOMM;
}
udelay(10);
mmcstatus = get_val(&regs->mmcst0);
}
printf("Status %x Timeout ST0:%x ST1:%x\n", st_ready, mmcstatus,
get_val(&regs->mmcst1));
return -ECOMM;
}
/*
* Sends a command out on the bus. Takes the device pointer,
* a command pointer, and an optional data pointer.
*/
#if !CONFIG_IS_ENABLED(DM_MMC)
static int dmmc_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd, struct mmc_data *data)
{
struct davinci_mmc *host = mmc->priv;
#else
static int
davinci_mmc_send_cmd(struct udevice *dev, struct mmc_cmd *cmd, struct mmc_data *data)
{
struct davinci_mmc_priv *host = dev_get_priv(dev);
#endif
volatile struct davinci_mmc_regs *regs = host->reg_base;
uint mmcstatus, status_rdy, status_err;
uint i, cmddata, bytes_left = 0;
int fifo_words, fifo_bytes, err;
char *data_buf = NULL;
/* Clear status registers */
mmcstatus = get_val(&regs->mmcst0);
fifo_words = 16;
fifo_bytes = fifo_words << 2;
/* Wait for any previous busy signal to be cleared */
dmmc_busy_wait(regs);
cmddata = cmd->cmdidx;
cmddata |= MMCCMD_PPLEN;
/* Send init clock for CMD0 */
if (cmd->cmdidx == MMC_CMD_GO_IDLE_STATE)
cmddata |= MMCCMD_INITCK;
switch (cmd->resp_type) {
case MMC_RSP_R1b:
cmddata |= MMCCMD_BSYEXP;
/* Fall-through */
case MMC_RSP_R1: /* R1, R1b, R5, R6, R7 */
cmddata |= MMCCMD_RSPFMT_R1567;
break;
case MMC_RSP_R2:
cmddata |= MMCCMD_RSPFMT_R2;
break;
case MMC_RSP_R3: /* R3, R4 */
cmddata |= MMCCMD_RSPFMT_R3;
break;
}
set_val(&regs->mmcim, 0);
if (data) {
/* clear previous data transfer if any and set new one */
bytes_left = (data->blocksize * data->blocks);
/* Reset FIFO - Always use 32 byte fifo threshold */
set_val(&regs->mmcfifoctl,
(MMCFIFOCTL_FIFOLEV | MMCFIFOCTL_FIFORST));
cmddata |= MMCCMD_DMATRIG;
cmddata |= MMCCMD_WDATX;
if (data->flags == MMC_DATA_READ) {
set_val(&regs->mmcfifoctl, MMCFIFOCTL_FIFOLEV);
} else if (data->flags == MMC_DATA_WRITE) {
set_val(&regs->mmcfifoctl,
(MMCFIFOCTL_FIFOLEV |
MMCFIFOCTL_FIFODIR));
cmddata |= MMCCMD_DTRW;
}
set_val(&regs->mmctod, 0xFFFF);
set_val(&regs->mmcnblk, (data->blocks & MMCNBLK_NBLK_MASK));
set_val(&regs->mmcblen, (data->blocksize & MMCBLEN_BLEN_MASK));
if (data->flags == MMC_DATA_WRITE) {
uint val;
data_buf = (char *)data->src;
/* For write, fill FIFO with data before issue of CMD */
for (i = 0; (i < fifo_words) && bytes_left; i++) {
memcpy((char *)&val, data_buf, 4);
set_val(&regs->mmcdxr, val);
data_buf += 4;
bytes_left -= 4;
}
}
} else {
set_val(&regs->mmcblen, 0);
set_val(&regs->mmcnblk, 0);
}
set_val(&regs->mmctor, 0x1FFF);
/* Send the command */
set_val(&regs->mmcarghl, cmd->cmdarg);
set_val(&regs->mmccmd, cmddata);
status_rdy = MMCST0_RSPDNE;
status_err = (MMCST0_TOUTRS | MMCST0_TOUTRD |
MMCST0_CRCWR | MMCST0_CRCRD);
if (cmd->resp_type & MMC_RSP_CRC)
status_err |= MMCST0_CRCRS;
mmcstatus = get_val(&regs->mmcst0);
err = dmmc_check_status(regs, &mmcstatus, status_rdy, status_err);
if (err)
return err;
/* For R1b wait for busy done */
if (cmd->resp_type == MMC_RSP_R1b)
dmmc_busy_wait(regs);
/* Collect response from controller for specific commands */
if (mmcstatus & MMCST0_RSPDNE) {
/* Copy the response to the response buffer */
if (cmd->resp_type & MMC_RSP_136) {
cmd->response[0] = get_val(&regs->mmcrsp67);
cmd->response[1] = get_val(&regs->mmcrsp45);
cmd->response[2] = get_val(&regs->mmcrsp23);
cmd->response[3] = get_val(&regs->mmcrsp01);
} else if (cmd->resp_type & MMC_RSP_PRESENT) {
cmd->response[0] = get_val(&regs->mmcrsp67);
}
}
if (data == NULL)
return 0;
if (data->flags == MMC_DATA_READ) {
/* check for DATDNE along with DRRDY as the controller might
* set the DATDNE without DRRDY for smaller transfers with
* less than FIFO threshold bytes
*/
status_rdy = MMCST0_DRRDY | MMCST0_DATDNE;
status_err = MMCST0_TOUTRD | MMCST0_CRCRD;
data_buf = data->dest;
} else {
status_rdy = MMCST0_DXRDY | MMCST0_DATDNE;
status_err = MMCST0_CRCWR;
}
/* Wait until all of the blocks are transferred */
while (bytes_left) {
err = dmmc_check_status(regs, &mmcstatus, status_rdy,
status_err);
if (err)
return err;
if (data->flags == MMC_DATA_READ) {
/*
* MMC controller sets the Data receive ready bit
* (DRRDY) in MMCST0 even before the entire FIFO is
* full. This results in erratic behavior if we start
* reading the FIFO soon after DRRDY. Wait for the
* FIFO full bit in MMCST1 for proper FIFO clearing.
*/
if (bytes_left > fifo_bytes)
dmmc_wait_fifo_status(regs, 0x4a);
else if (bytes_left == fifo_bytes) {
dmmc_wait_fifo_status(regs, 0x40);
if (cmd->cmdidx == MMC_CMD_SEND_EXT_CSD)
udelay(600);
}
for (i = 0; bytes_left && (i < fifo_words); i++) {
cmddata = get_val(&regs->mmcdrr);
memcpy(data_buf, (char *)&cmddata, 4);
data_buf += 4;
bytes_left -= 4;
}
} else {
/*
* MMC controller sets the Data transmit ready bit
* (DXRDY) in MMCST0 even before the entire FIFO is
* empty. This results in erratic behavior if we start
* writing the FIFO soon after DXRDY. Wait for the
* FIFO empty bit in MMCST1 for proper FIFO clearing.
*/
dmmc_wait_fifo_status(regs, MMCST1_FIFOEMP);
for (i = 0; bytes_left && (i < fifo_words); i++) {
memcpy((char *)&cmddata, data_buf, 4);
set_val(&regs->mmcdxr, cmddata);
data_buf += 4;
bytes_left -= 4;
}
dmmc_busy_wait(regs);
}
}
err = dmmc_check_status(regs, &mmcstatus, MMCST0_DATDNE, status_err);
if (err)
return err;
return 0;
}
/* Initialize Davinci MMC controller */
#if !CONFIG_IS_ENABLED(DM_MMC)
static int dmmc_init(struct mmc *mmc)
{
struct davinci_mmc *host = mmc->priv;
#else
static int davinci_dm_mmc_init(struct udevice *dev)
{
struct davinci_mmc_priv *host = dev_get_priv(dev);
#endif
struct davinci_mmc_regs *regs = host->reg_base;
/* Clear status registers explicitly - soft reset doesn't clear it
* If Uboot is invoked from UBL with SDMMC Support, the status
* registers can have uncleared bits
*/
get_val(&regs->mmcst0);
get_val(&regs->mmcst1);
/* Hold software reset */
set_bit(&regs->mmcctl, MMCCTL_DATRST);
set_bit(&regs->mmcctl, MMCCTL_CMDRST);
udelay(10);
set_val(&regs->mmcclk, 0x0);
set_val(&regs->mmctor, 0x1FFF);
set_val(&regs->mmctod, 0xFFFF);
/* Clear software reset */
clear_bit(&regs->mmcctl, MMCCTL_DATRST);
clear_bit(&regs->mmcctl, MMCCTL_CMDRST);
udelay(10);
/* Reset FIFO - Always use the maximum fifo threshold */
set_val(&regs->mmcfifoctl, (MMCFIFOCTL_FIFOLEV | MMCFIFOCTL_FIFORST));
set_val(&regs->mmcfifoctl, MMCFIFOCTL_FIFOLEV);
return 0;
}
/* Set buswidth or clock as indicated by the MMC framework */
#if !CONFIG_IS_ENABLED(DM_MMC)
static int dmmc_set_ios(struct mmc *mmc)
{
struct davinci_mmc *host = mmc->priv;
struct davinci_mmc_regs *regs = host->reg_base;
#else
static int davinci_mmc_set_ios(struct udevice *dev)
{
struct mmc *mmc = mmc_get_mmc_dev(dev);
struct davinci_mmc_priv *host = dev_get_priv(dev);
struct davinci_mmc_regs *regs = host->reg_base;
#endif
/* Set the bus width */
if (mmc->bus_width == 4)
set_bit(&regs->mmcctl, MMCCTL_WIDTH_4_BIT);
else
clear_bit(&regs->mmcctl, MMCCTL_WIDTH_4_BIT);
/* Set clock speed */
if (mmc->clock) {
#if !CONFIG_IS_ENABLED(DM_MMC)
dmmc_set_clock(mmc, mmc->clock);
#else
davinci_mmc_set_clock(dev, mmc->clock);
#endif
}
return 0;
}
#if !CONFIG_IS_ENABLED(DM_MMC)
static const struct mmc_ops dmmc_ops = {
.send_cmd = dmmc_send_cmd,
.set_ios = dmmc_set_ios,
.init = dmmc_init,
};
#else
static int davinci_mmc_getcd(struct udevice *dev)
{
int value = -1;
#if CONFIG_IS_ENABLED(DM_GPIO)
struct davinci_mmc_priv *priv = dev_get_priv(dev);
value = dm_gpio_get_value(&priv->cd_gpio);
#endif
/* if no CD return as 1 */
if (value < 0)
return 1;
return value;
}
static int davinci_mmc_getwp(struct udevice *dev)
{
int value = -1;
#if CONFIG_IS_ENABLED(DM_GPIO)
struct davinci_mmc_priv *priv = dev_get_priv(dev);
value = dm_gpio_get_value(&priv->wp_gpio);
#endif
/* if no WP return as 0 */
if (value < 0)
return 0;
return value;
}
static const struct dm_mmc_ops davinci_mmc_ops = {
.send_cmd = davinci_mmc_send_cmd,
.set_ios = davinci_mmc_set_ios,
.get_cd = davinci_mmc_getcd,
.get_wp = davinci_mmc_getwp,
};
#endif
#if !CONFIG_IS_ENABLED(DM_MMC)
/* Called from board_mmc_init during startup. Can be called multiple times
* depending on the number of slots available on board and controller
*/
int davinci_mmc_init(bd_t *bis, struct davinci_mmc *host)
{
host->cfg.name = "davinci";
host->cfg.ops = &dmmc_ops;
host->cfg.f_min = 200000;
host->cfg.f_max = 25000000;
host->cfg.voltages = host->voltages;
host->cfg.host_caps = host->host_caps;
host->cfg.b_max = DAVINCI_MAX_BLOCKS;
mmc_create(&host->cfg, host);
return 0;
}
#else
static int davinci_mmc_probe(struct udevice *dev)
{
struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
struct davinci_mmc_plat *plat = dev_get_platdata(dev);
struct davinci_mmc_priv *priv = dev_get_priv(dev);
priv->reg_base = plat->reg_base;
priv->input_clk = clk_get(DAVINCI_MMCSD_CLKID);
#if CONFIG_IS_ENABLED(DM_GPIO)
/* These GPIOs are optional */
gpio_request_by_name(dev, "cd-gpios", 0, &priv->cd_gpio, GPIOD_IS_IN);
gpio_request_by_name(dev, "wp-gpios", 0, &priv->wp_gpio, GPIOD_IS_IN);
#endif
upriv->mmc = &plat->mmc;
return davinci_dm_mmc_init(dev);
}
static int davinci_mmc_bind(struct udevice *dev)
{
struct davinci_mmc_plat *plat = dev_get_platdata(dev);
return mmc_bind(dev, &plat->mmc, &plat->cfg);
}
#if CONFIG_IS_ENABLED(OF_CONTROL)
static int davinci_mmc_ofdata_to_platdata(struct udevice *dev)
{
struct davinci_mmc_plat *plat = dev_get_platdata(dev);
struct mmc_config *cfg = &plat->cfg;
plat->reg_base = (struct davinci_mmc_regs *)dev_read_addr(dev);
cfg->f_min = 200000;
cfg->f_max = 25000000;
cfg->voltages = MMC_VDD_32_33 | MMC_VDD_33_34,
cfg->host_caps = MMC_MODE_4BIT, /* DA850 supports only 4-bit SD/MMC */
cfg->b_max = DAVINCI_MAX_BLOCKS;
cfg->name = "da830-mmc";
return 0;
}
static const struct udevice_id davinci_mmc_ids[] = {
{ .compatible = "ti,da830-mmc" },
{},
};
#endif
U_BOOT_DRIVER(ti_da830_mmc) = {
.name = "davinci_mmc",
.id = UCLASS_MMC,
#if CONFIG_IS_ENABLED(OF_CONTROL)
.of_match = davinci_mmc_ids,
.platdata_auto_alloc_size = sizeof(struct davinci_mmc_plat),
.ofdata_to_platdata = davinci_mmc_ofdata_to_platdata,
#endif
#if CONFIG_BLK
.bind = davinci_mmc_bind,
#endif
.probe = davinci_mmc_probe,
.ops = &davinci_mmc_ops,
.priv_auto_alloc_size = sizeof(struct davinci_mmc_priv),
#if !CONFIG_IS_ENABLED(OF_CONTROL)
.flags = DM_FLAG_PRE_RELOC,
#endif
};
#endif
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