Commit 7eb42da6 authored by Liming Sun's avatar Liming Sun Committed by Ulf Hansson
Browse files

mmc: sdhci-of-dwcmshc: Add hw_reset() support for BlueField-3 SoC 



The eMMC RST_N register is implemented as secure register on
the BlueField-3 SoC and controlled by TF-A. This commit adds the
hw_reset() support which sends an SMC call to TF-A for the eMMC
HW reset.

Reviewed-by: default avatarDavid Thompson <davthompson@nvidia.com>
Signed-off-by: default avatarLiming Sun <limings@nvidia.com>
Link: https://lore.kernel.org/r/20240827164016.237617-1-limings@nvidia.com


Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
parent f5e1638b

drivers/mmc/host/sdhci-of-dwcmshc.c

+28 −1
Original line number Diff line number Diff line
@@ -8,6 +8,7 @@ 
 */



#include <linux/acpi.h>

#include <linux/arm-smccc.h>

#include <linux/bitfield.h>

#include <linux/clk.h>

#include <linux/dma-mapping.h>
@@ -201,6 +202,9 @@ 
					 SDHCI_TRNS_BLK_CNT_EN | \

					 SDHCI_TRNS_DMA)



/* SMC call for BlueField-3 eMMC RST_N */

#define BLUEFIELD_SMC_SET_EMMC_RST_N	0x82000007



enum dwcmshc_rk_type {

	DWCMSHC_RK3568,

	DWCMSHC_RK3588,
@@ -1111,6 +1115,29 @@ static const struct sdhci_ops sdhci_dwcmshc_ops = { 
	.irq			= dwcmshc_cqe_irq_handler,

};



#ifdef CONFIG_ACPI

static void dwcmshc_bf3_hw_reset(struct sdhci_host *host)

{

	struct arm_smccc_res res = { 0 };



	arm_smccc_smc(BLUEFIELD_SMC_SET_EMMC_RST_N, 0, 0, 0, 0, 0, 0, 0, &res);



	if (res.a0)

		pr_err("%s: RST_N failed.\n", mmc_hostname(host->mmc));

}



static const struct sdhci_ops sdhci_dwcmshc_bf3_ops = {

	.set_clock		= sdhci_set_clock,

	.set_bus_width		= sdhci_set_bus_width,

	.set_uhs_signaling	= dwcmshc_set_uhs_signaling,

	.get_max_clock		= dwcmshc_get_max_clock,

	.reset			= sdhci_reset,

	.adma_write_desc	= dwcmshc_adma_write_desc,

	.irq			= dwcmshc_cqe_irq_handler,

	.hw_reset		= dwcmshc_bf3_hw_reset,

};

#endif



static const struct sdhci_ops sdhci_dwcmshc_rk35xx_ops = {

	.set_clock		= dwcmshc_rk3568_set_clock,

	.set_bus_width		= sdhci_set_bus_width,
@@ -1163,7 +1190,7 @@ static const struct dwcmshc_pltfm_data sdhci_dwcmshc_pdata = { 
#ifdef CONFIG_ACPI

static const struct dwcmshc_pltfm_data sdhci_dwcmshc_bf3_pdata = {

	.pdata = {

		.ops = &sdhci_dwcmshc_ops,

		.ops = &sdhci_dwcmshc_bf3_ops,

		.quirks = SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN,

		.quirks2 = SDHCI_QUIRK2_PRESET_VALUE_BROKEN |

			   SDHCI_QUIRK2_ACMD23_BROKEN,