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mmc: loongson2: Add Loongson-2K0300 SD/SDIO/eMMC controller driver

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This patch describes the two MMC controllers of the Loongson-2K0300 SoC,
one providing an eMMC interface and the other exporting an SD/SDIO
interface.

Its hardware design is similar to that of the Loongson-2K2000, but it
suffers from hardware defects such as missing CMD48 interrupts.

Signed-off-by: Binbin Zhou <zhoubinbin@loongson.cn>
Reviewed-by: Huacai Chen <chenhuacai@loongson.cn>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Binbin Zhou 2026-03-03 19:27:40 +08:00 committed by Ulf Hansson
parent 1d1519bc58
commit bdc1eb80b9
1 changed files with 27 additions and 0 deletions
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27
drivers/mmc/host/loongson2-mmc.c
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@ -189,6 +189,12 @@
#define LOONGSON2_MMC_DLLVAL_TIMEOUT_US 4000
#define LOONGSON2_MMC_TXFULL_TIMEOUT_US 500
/*
* Due to a hardware design flaw, the Loongson-2K0300 may fail to recognize the
* CMD48 (SD_READ_EXTR_SINGLE) interrupt.
*/
#define LOONGSON2_MMC_CMD48_QUIRK BIT(0)
/* Loongson-2K1000 SDIO2 DMA routing register */
#define LS2K1000_SDIO_DMA_MASK GENMASK(17, 15)
#define LS2K1000_DMA0_CONF 0x0
@ -245,6 +251,7 @@ struct loongson2_mmc_host {
};
struct loongson2_mmc_pdata {
u32 flags;
const struct regmap_config *regmap_config;
void (*reorder_cmd_data)(struct loongson2_mmc_host *host, struct mmc_command *cmd);
void (*fix_data_timeout)(struct loongson2_mmc_host *host, struct mmc_command *cmd);
@ -568,6 +575,12 @@ static void loongson2_mmc_request(struct mmc_host *mmc, struct mmc_request *mrq)
{
struct loongson2_mmc_host *host = mmc_priv(mmc);
if ((host->pdata->flags & LOONGSON2_MMC_CMD48_QUIRK) &&
mrq->cmd->opcode == SD_READ_EXTR_SINGLE) {
mmc_request_done(mmc, mrq);
return;
}
host->cmd_is_stop = 0;
host->mrq = mrq;
loongson2_mmc_send_request(mmc);
@ -839,7 +852,18 @@ static void loongson2_mmc_release_internal_dma(struct loongson2_mmc_host *host,
dma_free_coherent(dev, PAGE_SIZE, host->sg_cpu, host->sg_dma);
}
static struct loongson2_mmc_pdata ls2k0300_mmc_pdata = {
.flags = LOONGSON2_MMC_CMD48_QUIRK,
.regmap_config = &ls2k2000_mmc_regmap_config,
.reorder_cmd_data = ls2k2000_mmc_reorder_cmd_data,
.fix_data_timeout = ls2k2000_mmc_fix_data_timeout,
.setting_dma = ls2k2000_mmc_set_internal_dma,
.prepare_dma = loongson2_mmc_prepare_internal_dma,
.release_dma = loongson2_mmc_release_internal_dma,
};
static struct loongson2_mmc_pdata ls2k0500_mmc_pdata = {
.flags = 0,
.regmap_config = &ls2k0500_mmc_regmap_config,
.reorder_cmd_data = ls2k0500_mmc_reorder_cmd_data,
.setting_dma = ls2k0500_mmc_set_external_dma,
@ -848,6 +872,7 @@ static struct loongson2_mmc_pdata ls2k0500_mmc_pdata = {
};
static struct loongson2_mmc_pdata ls2k1000_mmc_pdata = {
.flags = 0,
.regmap_config = &ls2k0500_mmc_regmap_config,
.reorder_cmd_data = ls2k0500_mmc_reorder_cmd_data,
.setting_dma = ls2k1000_mmc_set_external_dma,
@ -856,6 +881,7 @@ static struct loongson2_mmc_pdata ls2k1000_mmc_pdata = {
};
static struct loongson2_mmc_pdata ls2k2000_mmc_pdata = {
.flags = 0,
.regmap_config = &ls2k2000_mmc_regmap_config,
.reorder_cmd_data = ls2k2000_mmc_reorder_cmd_data,
.fix_data_timeout = ls2k2000_mmc_fix_data_timeout,
@ -984,6 +1010,7 @@ static void loongson2_mmc_remove(struct platform_device *pdev)
}
static const struct of_device_id loongson2_mmc_of_ids[] = {
{ .compatible = "loongson,ls2k0300-mmc", .data = &ls2k0300_mmc_pdata },
{ .compatible = "loongson,ls2k0500-mmc", .data = &ls2k0500_mmc_pdata },
{ .compatible = "loongson,ls2k1000-mmc", .data = &ls2k1000_mmc_pdata },
{ .compatible = "loongson,ls2k2000-mmc", .data = &ls2k2000_mmc_pdata },