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scsi: ufs: ufs-mediatek: Support multiple VCC sources

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Support multiple VCC sources in MediaTek UFS platforms.

Two options are provided and distinguished by specific device tree
attributes as below examples,

[Option 1: By numbering]
mediatek,ufs-vcc-by-num;
vcc-opt1-supply = <&mt6373_vbuck4_ufs>;
vcc-opt2-supply = <&mt6363_vemc>;

[Option 2: By UFS version]
mediatek,ufs-vcc-by-ver;
vcc-ufs3-supply = <&mt6373_vbuck4_ufs>;

Link: https://lore.kernel.org/r/20220616053725.5681-11-stanley.chu@mediatek.com
Signed-off-by: Alice Chao <alice.chao@mediatek.com>
Signed-off-by: Peter Wang <peter.wang@mediatek.com>
Signed-off-by: Stanley Chu <stanley.chu@mediatek.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Stanley Chu 2022-06-16 13:37:24 +08:00 committed by Martin K. Petersen
parent 1d6f9decb6
commit ece418d029
2 changed files with 59 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

46
drivers/ufs/host/ufs-mediatek.c
View File

@ -669,6 +669,49 @@ static u32 ufs_mtk_get_ufs_hci_version(struct ufs_hba *hba)
return hba->ufs_version;
}
#define MAX_VCC_NAME 30
static int ufs_mtk_vreg_fix_vcc(struct ufs_hba *hba)
{
struct ufs_vreg_info *info = &hba->vreg_info;
struct device_node *np = hba->dev->of_node;
struct device *dev = hba->dev;
char vcc_name[MAX_VCC_NAME];
struct arm_smccc_res res;
int err, ver;
if (hba->vreg_info.vcc)
return 0;
if (of_property_read_bool(np, "mediatek,ufs-vcc-by-num")) {
ufs_mtk_get_vcc_num(res);
if (res.a1 > UFS_VCC_NONE && res.a1 < UFS_VCC_MAX)
snprintf(vcc_name, MAX_VCC_NAME, "vcc-opt%u", res.a1);
else
return -ENODEV;
} else if (of_property_read_bool(np, "mediatek,ufs-vcc-by-ver")) {
ver = (hba->dev_info.wspecversion & 0xF00) >> 8;
snprintf(vcc_name, MAX_VCC_NAME, "vcc-ufs%u", ver);
} else {
return 0;
}
err = ufshcd_populate_vreg(dev, vcc_name, &info->vcc);
if (err)
return err;
err = ufshcd_get_vreg(dev, info->vcc);
if (err)
return err;
err = regulator_enable(info->vcc->reg);
if (!err) {
info->vcc->enabled = true;
dev_info(dev, "%s: %s enabled\n", __func__, vcc_name);
}
return err;
}
/**
* ufs_mtk_init - find other essential mmio bases
* @hba: host controller instance
@ -1179,7 +1222,6 @@ static int ufs_mtk_apply_dev_quirks(struct ufs_hba *hba)
else
ufs_mtk_setup_ref_clk_wait_us(hba,
REFCLK_DEFAULT_WAIT_US);
return 0;
}
@ -1197,6 +1239,8 @@ static void ufs_mtk_fixup_dev_quirks(struct ufs_hba *hba)
hba->dev_quirks &= ~(UFS_DEVICE_QUIRK_DELAY_BEFORE_LPM |
UFS_DEVICE_QUIRK_DELAY_AFTER_LPM);
}
ufs_mtk_vreg_fix_vcc(hba);
}
static void ufs_mtk_event_notify(struct ufs_hba *hba,

14
drivers/ufs/host/ufs-mediatek.h
View File

@ -83,6 +83,7 @@ enum {
#define UFS_MTK_SIP_DEVICE_RESET BIT(1)
#define UFS_MTK_SIP_CRYPTO_CTRL BIT(2)
#define UFS_MTK_SIP_REF_CLK_NOTIFICATION BIT(3)
#define UFS_MTK_SIP_GET_VCC_NUM BIT(6)
#define UFS_MTK_SIP_DEVICE_PWR_CTRL BIT(7)
/*
@ -144,6 +145,16 @@ struct ufs_mtk_host {
u32 ip_ver;
};
/*
* Multi-VCC by Numbering
*/
enum ufs_mtk_vcc_num {
UFS_VCC_NONE = 0,
UFS_VCC_1,
UFS_VCC_2,
UFS_VCC_MAX
};
/*
* SMC call wrapper function
*/
@ -183,6 +194,9 @@ static void _ufs_mtk_smc(struct ufs_mtk_smc_arg s)
#define ufs_mtk_device_reset_ctrl(high, res) \
ufs_mtk_smc(UFS_MTK_SIP_DEVICE_RESET, &(res), high)
#define ufs_mtk_get_vcc_num(res) \
ufs_mtk_smc(UFS_MTK_SIP_GET_VCC_NUM, &(res))
#define ufs_mtk_device_pwr_ctrl(on, ufs_ver, res) \
ufs_mtk_smc(UFS_MTK_SIP_DEVICE_PWR_CTRL, &(res), on, ufs_ver)