phy: sun4i-usb: Rework HCI PHY (aka "pmu_unk1") handling

As Icenowy pointed out, newer manuals (starting with H6) actually
document the register block at offset 0x800 as "HCI controller and PHY
interface", also describe the bits in our "PMU_UNK1" register.
Let's put proper names to those "unknown" variables and symbols.

While we are at it, generalise the existing code by allowing a bitmap
of bits to clear and set, to cover newer SoCs: The A100 and H616 use a
different bit for the SIDDQ control.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Signed-off-by: Samuel Holland <samuel@sholland.org>
Link: https://lore.kernel.org/r/20220203013558.11490-3-samuel@sholland.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>

diff --git a/drivers/phy/allwinner/phy-sun4i-usb.c b/drivers/phy/allwinner/phy-sun4i-usb.c
index 624950fd48ba969277c3cecde2db4081c15db1e0..6675dad174154f287c647fa14ec2b8c00149caff 100644 (file)
--- a/drivers/phy/allwinner/phy-sun4i-usb.c
+++ b/drivers/phy/allwinner/phy-sun4i-usb.c
@@ -43,7 +43,7 @@
 #define REG_PHYCTL_A33                 0x10
 #define REG_PHY_OTGCTL                 0x20
 
-#define REG_PMU_UNK1                   0x10
+#define REG_HCI_PHY_CTL                        0x10
 
 #define PHYCTL_DATA                    BIT(7)
 
@@ -82,6 +82,7 @@
 /* A83T specific control bits for PHY0 */
 #define PHY_CTL_VBUSVLDEXT             BIT(5)
 #define PHY_CTL_SIDDQ                  BIT(3)
+#define PHY_CTL_H3_SIDDQ               BIT(1)
 
 /* A83T specific control bits for PHY2 HSIC */
 #define SUNXI_EHCI_HS_FORCE            BIT(20)
@@ -115,9 +116,9 @@ struct sun4i_usb_phy_cfg {
        int hsic_index;
        enum sun4i_usb_phy_type type;
        u32 disc_thresh;
+       u32 hci_phy_ctl_clear;
        u8 phyctl_offset;
        bool dedicated_clocks;
-       bool enable_pmu_unk1;
        bool phy0_dual_route;
        int missing_phys;
 };
@@ -288,6 +289,12 @@ static int sun4i_usb_phy_init(struct phy *_phy)
                return ret;
        }
 
+       if (phy->pmu && data->cfg->hci_phy_ctl_clear) {
+               val = readl(phy->pmu + REG_HCI_PHY_CTL);
+               val &= ~data->cfg->hci_phy_ctl_clear;
+               writel(val, phy->pmu + REG_HCI_PHY_CTL);
+       }
+
        if (data->cfg->type == sun8i_a83t_phy ||
            data->cfg->type == sun50i_h6_phy) {
                if (phy->index == 0) {
@@ -297,11 +304,6 @@ static int sun4i_usb_phy_init(struct phy *_phy)
                        writel(val, data->base + data->cfg->phyctl_offset);
                }
        } else {
-               if (phy->pmu && data->cfg->enable_pmu_unk1) {
-                       val = readl(phy->pmu + REG_PMU_UNK1);
-                       writel(val & ~2, phy->pmu + REG_PMU_UNK1);
-               }
-
                /* Enable USB 45 Ohm resistor calibration */
                if (phy->index == 0)
                        sun4i_usb_phy_write(phy, PHY_RES45_CAL_EN, 0x01, 1);
@@ -863,7 +865,6 @@ static const struct sun4i_usb_phy_cfg sun4i_a10_cfg = {
        .disc_thresh = 3,
        .phyctl_offset = REG_PHYCTL_A10,
        .dedicated_clocks = false,
-       .enable_pmu_unk1 = false,
 };
 
 static const struct sun4i_usb_phy_cfg sun5i_a13_cfg = {
@@ -872,7 +873,6 @@ static const struct sun4i_usb_phy_cfg sun5i_a13_cfg = {
        .disc_thresh = 2,
        .phyctl_offset = REG_PHYCTL_A10,
        .dedicated_clocks = false,
-       .enable_pmu_unk1 = false,
 };
 
 static const struct sun4i_usb_phy_cfg sun6i_a31_cfg = {
@@ -881,7 +881,6 @@ static const struct sun4i_usb_phy_cfg sun6i_a31_cfg = {
        .disc_thresh = 3,
        .phyctl_offset = REG_PHYCTL_A10,
        .dedicated_clocks = true,
-       .enable_pmu_unk1 = false,
 };
 
 static const struct sun4i_usb_phy_cfg sun7i_a20_cfg = {
@@ -890,7 +889,6 @@ static const struct sun4i_usb_phy_cfg sun7i_a20_cfg = {
        .disc_thresh = 2,
        .phyctl_offset = REG_PHYCTL_A10,
        .dedicated_clocks = false,
-       .enable_pmu_unk1 = false,
 };
 
 static const struct sun4i_usb_phy_cfg sun8i_a23_cfg = {
@@ -899,7 +897,6 @@ static const struct sun4i_usb_phy_cfg sun8i_a23_cfg = {
        .disc_thresh = 3,
        .phyctl_offset = REG_PHYCTL_A10,
        .dedicated_clocks = true,
-       .enable_pmu_unk1 = false,
 };
 
 static const struct sun4i_usb_phy_cfg sun8i_a33_cfg = {
@@ -908,7 +905,6 @@ static const struct sun4i_usb_phy_cfg sun8i_a33_cfg = {
        .disc_thresh = 3,
        .phyctl_offset = REG_PHYCTL_A33,
        .dedicated_clocks = true,
-       .enable_pmu_unk1 = false,
 };
 
 static const struct sun4i_usb_phy_cfg sun8i_a83t_cfg = {
@@ -925,7 +921,7 @@ static const struct sun4i_usb_phy_cfg sun8i_h3_cfg = {
        .disc_thresh = 3,
        .phyctl_offset = REG_PHYCTL_A33,
        .dedicated_clocks = true,
-       .enable_pmu_unk1 = true,
+       .hci_phy_ctl_clear = PHY_CTL_H3_SIDDQ,
        .phy0_dual_route = true,
 };
 
@@ -935,7 +931,7 @@ static const struct sun4i_usb_phy_cfg sun8i_r40_cfg = {
        .disc_thresh = 3,
        .phyctl_offset = REG_PHYCTL_A33,
        .dedicated_clocks = true,
-       .enable_pmu_unk1 = true,
+       .hci_phy_ctl_clear = PHY_CTL_H3_SIDDQ,
        .phy0_dual_route = true,
 };
 
@@ -945,7 +941,7 @@ static const struct sun4i_usb_phy_cfg sun8i_v3s_cfg = {
        .disc_thresh = 3,
        .phyctl_offset = REG_PHYCTL_A33,
        .dedicated_clocks = true,
-       .enable_pmu_unk1 = true,
+       .hci_phy_ctl_clear = PHY_CTL_H3_SIDDQ,
        .phy0_dual_route = true,
 };
 
@@ -955,7 +951,7 @@ static const struct sun4i_usb_phy_cfg sun50i_a64_cfg = {
        .disc_thresh = 3,
        .phyctl_offset = REG_PHYCTL_A33,
        .dedicated_clocks = true,
-       .enable_pmu_unk1 = true,
+       .hci_phy_ctl_clear = PHY_CTL_H3_SIDDQ,
        .phy0_dual_route = true,
 };