Re: [PATCH v5 2/3] scsi: ufs: spacemit: k3: Add UFS Host Controller driver

[Aurelien Jarno <aurelien@aurel32.net>]

Hi Yixun,

On 2026-09-16 02:59, Yixun Lan wrote:
> SpacemiT K3 SoC consist of UFS (Universal Flash Storage) Host Controller
> which has features compatible with JEDEC UFS 2.2, MIPI UniPro v1.61 and
> M-PHY v3.0 standard.
> 
> Tested-by: Aurelien Jarno <aurelien@aurel32.net>
> Tested-by: Anirudh Srinivasan <asrinivasan@oss.tenstorrent.com>
> Signed-off-by: Yixun Lan <dlan@kernel.org>
> ---
>  drivers/ufs/host/Kconfig        |  12 +
>  drivers/ufs/host/Makefile       |   1 +
>  drivers/ufs/host/ufs-spacemit.c | 688 ++++++++++++++++++++++++++++++++++++++++
>  drivers/ufs/host/ufs-spacemit.h |  79 +++++
>  4 files changed, 780 insertions(+)
> 
> diff --git a/drivers/ufs/host/Kconfig b/drivers/ufs/host/Kconfig
> index ff170c0b6da0..6146872fcecc 100644
> --- a/drivers/ufs/host/Kconfig
> +++ b/drivers/ufs/host/Kconfig
> @@ -132,6 +132,18 @@ config SCSI_UFS_VARIABLE_SG_ENTRY_SIZE
>  	bool
>  	default y if SCSI_UFS_EXYNOS && SCSI_UFS_CRYPTO
>  
> +config SCSI_UFS_SPACEMIT
> +	tristate "SpacemiT UFS controller driver"
> +	depends on SCSI_UFSHCD_PLATFORM && (ARCH_SPACEMIT || COMPILE_TEST)
> +	help
> +	  This selects the SpacemiT specific additions to UFSHCD platform driver.
> +	  UFS host on SpacemiT needs some vendor specific configuration before
> +	  accessing the hardware which includes PHY configuration and vendor
> +	  specific registers.
> +
> +	  Select this if you have UFS controller on SpacemiT chipset.
> +	  If unsure, say N.
> +
>  config SCSI_UFS_SPRD
>  	tristate "Unisoc specific hooks to UFS controller platform driver"
>  	depends on SCSI_UFSHCD_PLATFORM && (ARCH_SPRD || COMPILE_TEST)
> diff --git a/drivers/ufs/host/Makefile b/drivers/ufs/host/Makefile
> index 7d8db67eb23c..a3c447b8fc21 100644
> --- a/drivers/ufs/host/Makefile
> +++ b/drivers/ufs/host/Makefile
> @@ -13,6 +13,7 @@ obj-$(CONFIG_SCSI_UFS_HISI) += ufs-hisi.o
>  obj-$(CONFIG_SCSI_UFS_MEDIATEK) += ufs-mediatek.o
>  obj-$(CONFIG_SCSI_UFS_RENESAS) += ufs-renesas.o
>  obj-$(CONFIG_SCSI_UFS_ROCKCHIP) += ufs-rockchip.o
> +obj-$(CONFIG_SCSI_UFS_SPACEMIT) += ufs-spacemit.o
>  obj-$(CONFIG_SCSI_UFS_SPRD) += ufs-sprd.o
>  obj-$(CONFIG_SCSI_UFS_TI_J721E) += ti-j721e-ufs.o
>  obj-$(CONFIG_SCSI_UFS_AMD_VERSAL2) += ufs-amd-versal2.o ufshcd-dwc.o
> diff --git a/drivers/ufs/host/ufs-spacemit.c b/drivers/ufs/host/ufs-spacemit.c
> new file mode 100644
> index 000000000000..179e6edb2ac2
> --- /dev/null
> +++ b/drivers/ufs/host/ufs-spacemit.c
> @@ -0,0 +1,688 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * Copyright (c) 2026 SpacemiT (Hangzhou) Technology Co. Ltd
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/delay.h>
> +#include <linux/io.h>
> +#include <linux/iopoll.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/platform_device.h>
> +#include <linux/reset.h>
> +#include <linux/slab.h>
> +
> +#include <ufs/ufshcd.h>
> +#include <ufs/ufshci.h>
> +#include <ufs/ufs_quirks.h>
> +#include <ufs/unipro.h>
> +
> +#include "ufshcd-pltfrm.h"
> +#include "ufs-spacemit.h"
> +
> +/* PA Layer Gettable and settable M-PHY Specific Attributes */
> +#define PA_TXHSG1SYNCLENGTH		0x1552
> +#define PA_TXHSG1PREPARELENGTH		0x1553
> +#define PA_TXHSG2SYNCLENGTH		0x1554
> +#define PA_TXHSG2PREPARELENGTH		0x1555
> +#define PA_TXHSG3SYNCLENGTH		0x1556
> +#define PA_TXHSG3PREPARELENGTH		0x1557
> +#define PA_TXMK2EXTENSION		0x155A
> +#define PA_PEERSCRAMBLING		0x155B
> +#define PA_TXSKIP			0x155C
> +#define PA_TXSKIPPERIOD			0x155D
> +#define PA_PEER_TX_LCC_ENABLE		0x155F
> +
> +#define PA_SCRAMBLING			0x1585
> +#define PA_MK2EXTENSIONGUARDBAND	0x15AB
> +
> +/* Special TX/RX Configuration Attributes */
> +#define RX_LS_PRE_LEN_CAP		0x008D
> +#define RX_LANE_HB8_BKDOOR_ATTR		0x00F4
> +#define RX_PWRM_CLOSURE_LEN_CAP		0x008E
> +#define RX_MIN_STALL_CAP		0x0088
> +#define RX_LANE_SOF_BKDOOR_ATT		0x00F2
> +#define RX_GARBAGE_COUNT_OFFSET		0x00F2
> +
> +/* Special analog register */
> +#define ANA_EQ_CTRL_REG_ATTR		0x00CD
> +#define ANA_HSGEAR_CTRL_ATTR		0x00C1
> +
> +/*
> + * Keep UFS ACLK at a lower parent rate (409.6MHz) for stable init.
> + * This mirrors the "ufs-low-aclk-freq" change from the other environment.
> + */
> +#define UFS_ACLK_LOW_FREQ_HZ		409600000UL

You probably want to rename that to AXI, although here it's not that 
important.

> +
> +/* PHY register magic values */
> +#define MPHY_PU_ALL			0x87f
> +#define MPHY_PU_WITH_HB8_RESET		0xb7f
> +#define MPHY_DEVICE_REFCLK_OE		BIT(8)
> +#define MPHY_DEVICE_HW_RESET		BIT(0)
> +
> +#define MPHY_PLL_LOCK_BIT		BIT(31)
> +#define MPHY_PLL_LOCK_TIMEOUT_US	10000
> +
> +/* FSM states */
> +#define FSM_STATE_HIBERN8		0x1
> +#define FSM_STATE_ACTIVE		0x3
> +#define FSM_STATE_LS_BURST		0x5
> +
> +#define VENDOR_DUMP_BUF_SIZE		2048
> +#define VENDOR_MAX_OFFSET		0xE0
> +
> +/* M-PHY FSM states */
> +#define MPHY_RX_FSM_STATE	0xC1
> +#define MPHY_TX_FSM_STATE	0x41
> +
> +static int ufs_spacemit_dme_set(struct ufs_hba *hba,
> +				const struct ufshcd_dme_attr_val *v, int n)
> +{
> +	int ret = 0;
> +	int attr_node = 0;
> +
> +	for (attr_node = 0; attr_node < n; attr_node++) {
> +		ret = ufshcd_dme_set(hba, v[attr_node].attr_sel,
> +				     v[attr_node].mib_val);
> +
> +		if (ret)
> +			return ret;
> +	}
> +
> +	return 0;
> +}
> +
> +static int ufs_spacemit_check_hibern8(struct ufs_hba *hba)
> +{
> +	u32 tx_fsm_val_0 = 0;
> +	u32 tx_fsm_val_1 = 0;
> +	int retries = DIV_ROUND_UP(HBRN8_POLL_TOUT_MS * 1000, 100);
> +	int err = 0;
> +
> +	do {
> +		err = ufshcd_dme_get(hba,
> +				     UIC_ARG_MIB_SEL(MPHY_TX_FSM_STATE,
> +						     UIC_ARG_MPHY_TX_GEN_SEL_INDEX(0)),
> +				     &tx_fsm_val_0);
> +		if (err)
> +			break;
> +
> +		err = ufshcd_dme_get(hba,
> +				     UIC_ARG_MIB_SEL(MPHY_TX_FSM_STATE,
> +						     UIC_ARG_MPHY_TX_GEN_SEL_INDEX(1)),
> +				     &tx_fsm_val_1);
> +		if (err || (tx_fsm_val_0 == TX_FSM_HIBERN8 &&
> +			    tx_fsm_val_1 == TX_FSM_HIBERN8))
> +			break;
> +
> +		usleep_range(100, 200);
> +	} while (--retries > 0);
> +
> +	if (err) {
> +		dev_err(hba->dev, "%s: unable to get TX_FSM_STATE, err %d\n",
> +			__func__, err);
> +	} else if (tx_fsm_val_0 != TX_FSM_HIBERN8 ||
> +		   tx_fsm_val_1 != TX_FSM_HIBERN8) {
> +		err = -ETIMEDOUT;
> +		dev_err(hba->dev,
> +			"%s: invalid TX_FSM_STATE, lane0 = %u, lane1 = %u\n",
> +			__func__, tx_fsm_val_0, tx_fsm_val_1);
> +	}
> +
> +	return err;
> +}
> +
> +static u32 ufs_spacemit_get_sys1clk_1us(struct ufs_hba *hba)
> +{
> +	struct ufs_clk_info *clki, *ufs_aclk = NULL;
> +	struct list_head *head = &hba->clk_list_head;
> +	unsigned long rate_hz = 0;
> +
> +	if (!list_empty(head)) {
> +		list_for_each_entry(clki, head, list) {
> +			if (clki->name && !strcmp(clki->name, "aclk") && clki->clk) {

On the other hand, you definitely want to rename this one to "axi" to 
match the device tree change. Right now the whole patchset just doesn't 
work.

> +				ufs_aclk = clki;
> +				break;
> +			}
> +		}
> +	}
> +
> +	if (ufs_aclk && ufs_aclk->clk)
> +		rate_hz = clk_get_rate(ufs_aclk->clk);
> +
> +	if (!rate_hz)
> +		return 0;
> +
> +	return DIV_ROUND_CLOSEST(rate_hz, 1000000);
> +}

Regards
Aurelien

-- 
Aurelien Jarno                          GPG: 4096R/1DDD8C9B
aurelien@aurel32.net                     http://aurel32.net

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