[PATCH 2/2] mmc: mtk-sd: add support for AN7581 MMC Host

Christian Marangi
2025-01-15T07:30:55Z

Add support for AN7581 MMC Host. The MMC Host controller is based on
mt7622 with the difference of not having regulator supply and state_uhs
pins and hclk clock.

Some minor fixes are applied to check if the state_uhs pins are defined
and make hclk optional for the new airoha compatible.

Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
---
drivers/mmc/host/mtk-sd.c | 55 ++++++++++++++++++++++++++++++++-------
1 file changed, 46 insertions(+), 9 deletions(-)

diff --git a/drivers/mmc/host/mtk-sd.c b/drivers/mmc/host/mtk-sd.c
index efb0d2d5716b..9d6868883c91 100644
--- a/drivers/mmc/host/mtk-sd.c
+++ b/drivers/mmc/host/mtk-sd.c
@@ -666,6 +666,20 @@ static const struct mtk_mmc_compatible mt8196_compat = {
.support_new_rx = true,
};

+static const struct mtk_mmc_compatible an7581_compat = {
+ .clk_div_bits = 12,
+ .recheck_sdio_irq = true,
+ .hs400_tune = false,
+ .pad_tune_reg = MSDC_PAD_TUNE0,
+ .async_fifo = true,
+ .data_tune = true,
+ .busy_check = true,
+ .stop_clk_fix = true,
+ .stop_dly_sel = 3,
+ .enhance_rx = true,
+ .support_64g = false,
+};
+
static const struct of_device_id msdc_of_ids[] = {
{ .compatible = "mediatek,mt2701-mmc", .data = &mt2701_compat},
{ .compatible = "mediatek,mt2712-mmc", .data = &mt2712_compat},
@@ -680,7 +694,7 @@ static const struct of_device_id msdc_of_ids[] = {
{ .compatible = "mediatek,mt8183-mmc", .data = &mt8183_compat},
{ .compatible = "mediatek,mt8196-mmc", .data = &mt8196_compat},
{ .compatible = "mediatek,mt8516-mmc", .data = &mt8516_compat},
-
+ { .compatible = "airoha,an7581-mmc", .data = &an7581_compat},
{}
};
MODULE_DEVICE_TABLE(of, msdc_of_ids);
@@ -1600,6 +1614,10 @@ static int msdc_ops_switch_volt(struct mmc_host *mmc, struct mmc_ios *ios)
struct msdc_host *host = mmc_priv(mmc);
int ret;

+ /* Skip setting supply if not supported */
+ if (!mmc->supply.vqmmc)
+ return 0;
+
if (!IS_ERR(mmc->supply.vqmmc)) {
if (ios->signal_voltage != MMC_SIGNAL_VOLTAGE_330 &&
ios->signal_voltage != MMC_SIGNAL_VOLTAGE_180) {
@@ -1699,7 +1717,9 @@ static void msdc_enable_sdio_irq(struct mmc_host *mmc, int enb)
dev_dbg(host->dev, "SDIO eint irq: %d!\n", host->eint_irq);
}

- pinctrl_select_state(host->pinctrl, host->pins_uhs);
+ /* Skip setting uhs pins if not supported */
+ if (host->pins_uhs)
+ pinctrl_select_state(host->pinctrl, host->pins_uhs);
} else {
dev_pm_clear_wake_irq(host->dev);
}
@@ -2036,6 +2056,10 @@ static void msdc_ops_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)

msdc_set_buswidth(host, ios->bus_width);

+ /* Skip regulator if not supported */
+ if (!mmc->supply.vmmc)
+ goto skip_regulator;
+
/* Suspend/Resume will do power off/on */
switch (ios->power_mode) {
case MMC_POWER_UP:
@@ -2071,6 +2095,7 @@ static void msdc_ops_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
break;
}

+skip_regulator:
if (host->mclk != ios->clock || host->timing != ios->timing)
msdc_set_mclk(host, ios->timing, ios->clock);
}
@@ -2816,9 +2841,12 @@ static int msdc_of_clock_parse(struct platform_device *pdev,
if (IS_ERR(host->src_clk))
return PTR_ERR(host->src_clk);

- host->h_clk = devm_clk_get(&pdev->dev, "hclk");
- if (IS_ERR(host->h_clk))
- return PTR_ERR(host->h_clk);
+ /* AN7581 SoC doesn't have hclk */
+ if (!device_is_compatible(&pdev->dev, "airoha,an7581-mmc")) {
+ host->h_clk = devm_clk_get(&pdev->dev, "hclk");
+ if (IS_ERR(host->h_clk))
+ return PTR_ERR(host->h_clk);
+ }

host->bus_clk = devm_clk_get_optional(&pdev->dev, "bus_clk");
if (IS_ERR(host->bus_clk))
@@ -2926,10 +2954,13 @@ static int msdc_drv_probe(struct platform_device *pdev)
return PTR_ERR(host->pins_default);
}

- host->pins_uhs = pinctrl_lookup_state(host->pinctrl, "state_uhs");
- if (IS_ERR(host->pins_uhs)) {
- dev_err(&pdev->dev, "Cannot find pinctrl uhs!\n");
- return PTR_ERR(host->pins_uhs);
+ /* AN7581 doesn't have state_uhs pins */
+ if (!device_is_compatible(&pdev->dev, "airoha,an7581-mmc")) {
+ host->pins_uhs = pinctrl_lookup_state(host->pinctrl, "state_uhs");
+ if (IS_ERR(host->pins_uhs)) {
+ dev_err(&pdev->dev, "Cannot find pinctrl uhs!\n");
+ return PTR_ERR(host->pins_uhs);
+ }
}

/* Support for SDIO eint irq ? */
@@ -3010,6 +3041,12 @@ static int msdc_drv_probe(struct platform_device *pdev)
dev_err(&pdev->dev, "Cannot ungate clocks!\n");
goto release_clk;
}
+
+ /* AN7581 without regulator require tune to OCR values */
+ if (device_is_compatible(&pdev->dev, "airoha,an7581-mmc") &&
+ !mmc->ocr_avail)
+ mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
+
msdc_init_hw(host);

if (mmc->caps2 & MMC_CAP2_CQE) {
--
2.45.2