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mmc: tmio: add eMMC support

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We need to add R1 without CRC support, refactor the bus width routine a
little and extend a quirk check. To support "non-removable;" we need a
workaround which will be hopefully removed when reworking PM soon.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Wolfram Sang 2016-09-19 22:57:48 +02:00 committed by Ulf Hansson
parent f7dd5462da
commit 0bc0b6e865
2 changed files with 29 additions and 12 deletions
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3
drivers/mmc/host/tmio_mmc.h
View file

@ -79,6 +79,9 @@
#define CLK_CTL_DIV_MASK 0xff
#define CLK_CTL_SCLKEN BIT(8)
#define CARD_OPT_WIDTH8 BIT(13)
#define CARD_OPT_WIDTH BIT(15)
#define TMIO_BBS 512 /* Boot block size */
/* Definitions for values the CTRL_SDIO_STATUS register can take. */

38
drivers/mmc/host/tmio_mmc_pio.c
View file

@ -336,7 +336,9 @@ static int tmio_mmc_start_command(struct tmio_mmc_host *host, struct mmc_command
switch (mmc_resp_type(cmd)) {
case MMC_RSP_NONE: c |= RESP_NONE; break;
case MMC_RSP_R1: c |= RESP_R1; break;
case MMC_RSP_R1:
case MMC_RSP_R1_NO_CRC:
c |= RESP_R1; break;
case MMC_RSP_R1B: c |= RESP_R1B; break;
case MMC_RSP_R2: c |= RESP_R2; break;
case MMC_RSP_R3: c |= RESP_R3; break;
@ -730,12 +732,13 @@ static int tmio_mmc_start_data(struct tmio_mmc_host *host,
pr_debug("setup data transfer: blocksize %08x nr_blocks %d\n",
data->blksz, data->blocks);
/* Some hardware cannot perform 2 byte requests in 4 bit mode */
if (host->mmc->ios.bus_width == MMC_BUS_WIDTH_4) {
/* Some hardware cannot perform 2 byte requests in 4/8 bit mode */
if (host->mmc->ios.bus_width == MMC_BUS_WIDTH_4 ||
host->mmc->ios.bus_width == MMC_BUS_WIDTH_8) {
int blksz_2bytes = pdata->flags & TMIO_MMC_BLKSZ_2BYTES;
if (data->blksz < 2 || (data->blksz < 4 && !blksz_2bytes)) {
pr_err("%s: %d byte block unsupported in 4 bit mode\n",
pr_err("%s: %d byte block unsupported in 4/8 bit mode\n",
mmc_hostname(host->mmc), data->blksz);
return -EINVAL;
}
@ -857,14 +860,16 @@ static void tmio_mmc_power_off(struct tmio_mmc_host *host)
static void tmio_mmc_set_bus_width(struct tmio_mmc_host *host,
unsigned char bus_width)
{
switch (bus_width) {
case MMC_BUS_WIDTH_1:
sd_ctrl_write16(host, CTL_SD_MEM_CARD_OPT, 0x80e0);
break;
case MMC_BUS_WIDTH_4:
sd_ctrl_write16(host, CTL_SD_MEM_CARD_OPT, 0x00e0);
break;
}
u16 reg = sd_ctrl_read16(host, CTL_SD_MEM_CARD_OPT)
& ~(CARD_OPT_WIDTH | CARD_OPT_WIDTH8);
/* reg now applies to MMC_BUS_WIDTH_4 */
if (bus_width == MMC_BUS_WIDTH_1)
reg |= CARD_OPT_WIDTH;
else if (bus_width == MMC_BUS_WIDTH_8)
reg |= CARD_OPT_WIDTH8;
sd_ctrl_write16(host, CTL_SD_MEM_CARD_OPT, reg);
}
/* Set MMC clock / power.
@ -1082,6 +1087,15 @@ int tmio_mmc_host_probe(struct tmio_mmc_host *_host,
!mmc_card_is_removable(mmc) ||
mmc->slot.cd_irq >= 0);
/*
* On Gen2+, eMMC with NONREMOVABLE currently fails because native
* hotplug gets disabled. It seems RuntimePM related yet we need further
* research. Since we are planning a PM overhaul anyway, let's enforce
* for now the device being active by enabling native hotplug always.
*/
if (pdata->flags & TMIO_MMC_MIN_RCAR2)
_host->native_hotplug = true;
if (tmio_mmc_clk_enable(_host) < 0) {
mmc->f_max = pdata->hclk;
mmc->f_min = mmc->f_max / 512;