[PATCH v3 06/15] phy: tegra: xusb: Add Tegra210 lane_iddq operation

JC Kuo
2020-09-09T08:13:43Z

As per Tegra210 TRM, before changing lane assignments, driver should
keep lanes in IDDQ and sleep state; after changing lane assignments,
driver should bring lanes out of IDDQ.
This commit implements the required operations.

Signed-off-by: JC Kuo <jckuo@nvidia.com>
---
v3:
add 'misc_ctl2' data member to UPHY lane for carrying MISC_PAD_PX_CTL2 offset
tegra210_uphy_lane_iddq_[enable/disable]() to access 'misc_ctl2' data member

drivers/phy/tegra/xusb-tegra210.c | 82 ++++++++++++++++++++++++++++---
drivers/phy/tegra/xusb.c | 6 +++
drivers/phy/tegra/xusb.h | 6 +++
3 files changed, 86 insertions(+), 8 deletions(-)

diff --git a/drivers/phy/tegra/xusb-tegra210.c b/drivers/phy/tegra/xusb-tegra210.c
index b3f065ef92e6..ff5dbc4818b0 100644
--- a/drivers/phy/tegra/xusb-tegra210.c
+++ b/drivers/phy/tegra/xusb-tegra210.c
@@ -198,6 +198,18 @@
#define XUSB_PADCTL_UPHY_MISC_PAD_CTL1_AUX_RX_TERM_EN BIT(18)
#define XUSB_PADCTL_UPHY_MISC_PAD_CTL1_AUX_RX_MODE_OVRD BIT(13)

+#define XUSB_PADCTL_UPHY_MISC_PAD_PX_CTL2(x) (0x464 + (x) * 0x40)
+#define XUSB_PADCTL_UPHY_MISC_PAD_CTL2_TX_IDDQ BIT(0)
+#define XUSB_PADCTL_UPHY_MISC_PAD_CTL2_TX_IDDQ_OVRD BIT(1)
+#define XUSB_PADCTL_UPHY_MISC_PAD_CTL2_TX_SLEEP_MASK (0x3 << 4)
+#define XUSB_PADCTL_UPHY_MISC_PAD_CTL2_TX_SLEEP_VAL (0x3 << 4)
+#define XUSB_PADCTL_UPHY_MISC_PAD_CTL2_TX_PWR_OVRD BIT(24)
+#define XUSB_PADCTL_UPHY_MISC_PAD_CTL2_RX_IDDQ BIT(8)
+#define XUSB_PADCTL_UPHY_MISC_PAD_CTL2_RX_IDDQ_OVRD BIT(9)
+#define XUSB_PADCTL_UPHY_MISC_PAD_CTL2_RX_SLEEP_MASK (0x3 << 12)
+#define XUSB_PADCTL_UPHY_MISC_PAD_CTL2_RX_SLEEP_VAL (0x3 << 12)
+#define XUSB_PADCTL_UPHY_MISC_PAD_CTL2_RX_PWR_OVRD BIT(25)
+
#define XUSB_PADCTL_UPHY_PLL_S0_CTL1 0x860

#define XUSB_PADCTL_UPHY_PLL_S0_CTL2 0x864
@@ -209,6 +221,7 @@
#define XUSB_PADCTL_UPHY_PLL_S0_CTL8 0x87c

#define XUSB_PADCTL_UPHY_MISC_PAD_S0_CTL1 0x960
+#define XUSB_PADCTL_UPHY_MISC_PAD_S0_CTL2 0x964

#define XUSB_PADCTL_UPHY_USB3_PADX_ECTL1(x) (0xa60 + (x) * 0x40)
#define XUSB_PADCTL_UPHY_USB3_PAD_ECTL1_TX_TERM_CTRL_SHIFT 16
@@ -1640,6 +1653,55 @@ static const struct tegra_xusb_pad_soc tegra210_hsic_pad = {
.ops = &tegra210_hsic_ops,
};

+static void tegra210_uphy_lane_iddq_enable(struct tegra_xusb_lane *lane)
+{
+ struct tegra_xusb_padctl *padctl = lane->pad->padctl;
+ u32 value;
+
+ value = padctl_readl(padctl, lane->soc->regs.misc_ctl2);
+ value |= XUSB_PADCTL_UPHY_MISC_PAD_CTL2_TX_IDDQ_OVRD;
+ value |= XUSB_PADCTL_UPHY_MISC_PAD_CTL2_RX_IDDQ_OVRD;
+ value |= XUSB_PADCTL_UPHY_MISC_PAD_CTL2_TX_PWR_OVRD;
+ value |= XUSB_PADCTL_UPHY_MISC_PAD_CTL2_RX_PWR_OVRD;
+ value |= XUSB_PADCTL_UPHY_MISC_PAD_CTL2_TX_IDDQ;
+ value &= ~XUSB_PADCTL_UPHY_MISC_PAD_CTL2_TX_SLEEP_MASK;
+ value |= XUSB_PADCTL_UPHY_MISC_PAD_CTL2_TX_SLEEP_VAL;
+ value |= XUSB_PADCTL_UPHY_MISC_PAD_CTL2_RX_IDDQ;
+ value &= ~XUSB_PADCTL_UPHY_MISC_PAD_CTL2_RX_SLEEP_MASK;
+ value |= XUSB_PADCTL_UPHY_MISC_PAD_CTL2_RX_SLEEP_VAL;
+ padctl_writel(padctl, value, lane->soc->regs.misc_ctl2);
+}
+
+static void tegra210_uphy_lane_iddq_disable(struct tegra_xusb_lane *lane)
+{
+ struct tegra_xusb_padctl *padctl = lane->pad->padctl;
+ u32 value;
+
+ value = padctl_readl(padctl, lane->soc->regs.misc_ctl2);
+ value &= ~XUSB_PADCTL_UPHY_MISC_PAD_CTL2_TX_IDDQ_OVRD;
+ value &= ~XUSB_PADCTL_UPHY_MISC_PAD_CTL2_RX_IDDQ_OVRD;
+ value &= ~XUSB_PADCTL_UPHY_MISC_PAD_CTL2_TX_PWR_OVRD;
+ value &= ~XUSB_PADCTL_UPHY_MISC_PAD_CTL2_RX_PWR_OVRD;
+ value |= XUSB_PADCTL_UPHY_MISC_PAD_CTL2_TX_IDDQ;
+ value &= ~XUSB_PADCTL_UPHY_MISC_PAD_CTL2_TX_SLEEP_MASK;
+ value |= XUSB_PADCTL_UPHY_MISC_PAD_CTL2_TX_SLEEP_VAL;
+ value |= XUSB_PADCTL_UPHY_MISC_PAD_CTL2_RX_IDDQ;
+ value &= ~XUSB_PADCTL_UPHY_MISC_PAD_CTL2_RX_SLEEP_MASK;
+ value |= XUSB_PADCTL_UPHY_MISC_PAD_CTL2_RX_SLEEP_VAL;
+ padctl_writel(padctl, value, lane->soc->regs.misc_ctl2);
+}
+
+#define TEGRA210_UPHY_LANE(_name, _offset, _shift, _mask, _type, _misc) \
+ { \
+ .name = _name, \
+ .offset = _offset, \
+ .shift = _shift, \
+ .mask = _mask, \
+ .num_funcs = ARRAY_SIZE(tegra210_##_type##_functions), \
+ .funcs = tegra210_##_type##_functions, \
+ .regs.misc_ctl2 = _misc, \
+ }
+
static const char *tegra210_pcie_functions[] = {
"pcie-x1",
"usb3-ss",
@@ -1648,13 +1710,13 @@ static const char *tegra210_pcie_functions[] = {
};

static const struct tegra_xusb_lane_soc tegra210_pcie_lanes[] = {
- TEGRA210_LANE("pcie-0", 0x028, 12, 0x3, pcie),
- TEGRA210_LANE("pcie-1", 0x028, 14, 0x3, pcie),
- TEGRA210_LANE("pcie-2", 0x028, 16, 0x3, pcie),
- TEGRA210_LANE("pcie-3", 0x028, 18, 0x3, pcie),
- TEGRA210_LANE("pcie-4", 0x028, 20, 0x3, pcie),
- TEGRA210_LANE("pcie-5", 0x028, 22, 0x3, pcie),
- TEGRA210_LANE("pcie-6", 0x028, 24, 0x3, pcie),
+ TEGRA210_UPHY_LANE("pcie-0", 0x028, 12, 0x3, pcie, XUSB_PADCTL_UPHY_MISC_PAD_PX_CTL2(0)),
+ TEGRA210_UPHY_LANE("pcie-1", 0x028, 14, 0x3, pcie, XUSB_PADCTL_UPHY_MISC_PAD_PX_CTL2(1)),
+ TEGRA210_UPHY_LANE("pcie-2", 0x028, 16, 0x3, pcie, XUSB_PADCTL_UPHY_MISC_PAD_PX_CTL2(2)),
+ TEGRA210_UPHY_LANE("pcie-3", 0x028, 18, 0x3, pcie, XUSB_PADCTL_UPHY_MISC_PAD_PX_CTL2(3)),
+ TEGRA210_UPHY_LANE("pcie-4", 0x028, 20, 0x3, pcie, XUSB_PADCTL_UPHY_MISC_PAD_PX_CTL2(4)),
+ TEGRA210_UPHY_LANE("pcie-5", 0x028, 22, 0x3, pcie, XUSB_PADCTL_UPHY_MISC_PAD_PX_CTL2(5)),
+ TEGRA210_UPHY_LANE("pcie-6", 0x028, 24, 0x3, pcie, XUSB_PADCTL_UPHY_MISC_PAD_PX_CTL2(6)),
};

static struct tegra_xusb_usb3_port *
@@ -1815,6 +1877,8 @@ static void tegra210_pcie_lane_remove(struct tegra_xusb_lane *lane)
static const struct tegra_xusb_lane_ops tegra210_pcie_lane_ops = {
.probe = tegra210_pcie_lane_probe,
.remove = tegra210_pcie_lane_remove,
+ .iddq_enable = tegra210_uphy_lane_iddq_enable,
+ .iddq_disable = tegra210_uphy_lane_iddq_disable,
};

static int tegra210_pcie_phy_init(struct phy *phy)
@@ -1939,7 +2003,7 @@ static const struct tegra_xusb_pad_soc tegra210_pcie_pad = {
};

static const struct tegra_xusb_lane_soc tegra210_sata_lanes[] = {
- TEGRA210_LANE("sata-0", 0x028, 30, 0x3, pcie),
+ TEGRA210_UPHY_LANE("sata-0", 0x028, 30, 0x3, pcie, XUSB_PADCTL_UPHY_MISC_PAD_S0_CTL2),
};

static struct tegra_xusb_lane *
@@ -1978,6 +2042,8 @@ static void tegra210_sata_lane_remove(struct tegra_xusb_lane *lane)
static const struct tegra_xusb_lane_ops tegra210_sata_lane_ops = {
.probe = tegra210_sata_lane_probe,
.remove = tegra210_sata_lane_remove,
+ .iddq_enable = tegra210_uphy_lane_iddq_enable,
+ .iddq_disable = tegra210_uphy_lane_iddq_disable,
};

static int tegra210_sata_phy_init(struct phy *phy)
diff --git a/drivers/phy/tegra/xusb.c b/drivers/phy/tegra/xusb.c
index b48b590aa0c1..b92478a350df 100644
--- a/drivers/phy/tegra/xusb.c
+++ b/drivers/phy/tegra/xusb.c
@@ -321,11 +321,17 @@ static void tegra_xusb_lane_program(struct tegra_xusb_lane *lane)
if (soc->num_funcs < 2)
return;

+ if (lane->pad->ops->iddq_enable)
+ lane->pad->ops->iddq_enable(lane);
+
/* choose function */
value = padctl_readl(padctl, soc->offset);
value &= ~(soc->mask << soc->shift);
value |= lane->function << soc->shift;
padctl_writel(padctl, value, soc->offset);
+
+ if (lane->pad->ops->iddq_disable)
+ lane->pad->ops->iddq_disable(lane);
}

static void tegra_xusb_pad_program(struct tegra_xusb_pad *pad)
diff --git a/drivers/phy/tegra/xusb.h b/drivers/phy/tegra/xusb.h
index 0c828694cf2d..9463bc74729e 100644
--- a/drivers/phy/tegra/xusb.h
+++ b/drivers/phy/tegra/xusb.h
@@ -35,6 +35,10 @@ struct tegra_xusb_lane_soc {

const char * const *funcs;
unsigned int num_funcs;
+
+ struct {
+ unsigned int misc_ctl2;
+ } regs;
};

struct tegra_xusb_lane {
@@ -126,6 +130,8 @@ struct tegra_xusb_lane_ops {
struct device_node *np,
unsigned int index);
void (*remove)(struct tegra_xusb_lane *lane);
+ void (*iddq_enable)(struct tegra_xusb_lane *lane);
+ void (*iddq_disable)(struct tegra_xusb_lane *lane);
};

bool tegra_xusb_lane_check(struct tegra_xusb_lane *lane, const char *function);
--
2.25.1