phy: allwinner: phy-sun6i-mipi-dphy: Add the A100 DPHY variant

A100 features an updated DPHY, which moves PLL control inside the DPHY
register space (previously the PLL was controlled from the CCU). It also
requires a modified analog power-on sequence. This "combo PHY" can also
be used as an LVDS PHY, but that is not yet supported by the driver.

Signed-off-by: Samuel Holland <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Vinod Koul <[email protected]>

Author: smaeul

drivers/phy/allwinner/phy-sun6i-mipi-dphy.c

@@ -70,11 +70,19 @@
 
 #define SUN6I_DPHY_ANA0_REG		0x4c
 #define SUN6I_DPHY_ANA0_REG_PWS			BIT(31)
+#define SUN6I_DPHY_ANA0_REG_PWEND		BIT(30)
+#define SUN6I_DPHY_ANA0_REG_PWENC		BIT(29)
 #define SUN6I_DPHY_ANA0_REG_DMPC		BIT(28)
 #define SUN6I_DPHY_ANA0_REG_DMPD(n)		(((n) & 0xf) << 24)
+#define SUN6I_DPHY_ANA0_REG_SRXDT(n)		(((n) & 0xf) << 20)
+#define SUN6I_DPHY_ANA0_REG_SRXCK(n)		(((n) & 0xf) << 16)
+#define SUN6I_DPHY_ANA0_REG_SDIV2		BIT(15)
 #define SUN6I_DPHY_ANA0_REG_SLV(n)		(((n) & 7) << 12)
 #define SUN6I_DPHY_ANA0_REG_DEN(n)		(((n) & 0xf) << 8)
+#define SUN6I_DPHY_ANA0_REG_PLR(n)		(((n) & 0xf) << 4)
 #define SUN6I_DPHY_ANA0_REG_SFB(n)		(((n) & 3) << 2)
+#define SUN6I_DPHY_ANA0_REG_RSD			BIT(1)
+#define SUN6I_DPHY_ANA0_REG_SELSCK		BIT(0)
 
 #define SUN6I_DPHY_ANA1_REG		0x50
 #define SUN6I_DPHY_ANA1_REG_VTTMODE		BIT(31)
@@ -97,8 +105,13 @@
 #define SUN6I_DPHY_ANA3_EN_LDOR			BIT(18)
 
 #define SUN6I_DPHY_ANA4_REG		0x5c
+#define SUN6I_DPHY_ANA4_REG_EN_MIPI		BIT(31)
+#define SUN6I_DPHY_ANA4_REG_EN_COMTEST		BIT(30)
+#define SUN6I_DPHY_ANA4_REG_COMTEST(n)		(((n) & 3) << 28)
+#define SUN6I_DPHY_ANA4_REG_IB(n)		(((n) & 3) << 25)
 #define SUN6I_DPHY_ANA4_REG_DMPLVC		BIT(24)
 #define SUN6I_DPHY_ANA4_REG_DMPLVD(n)		(((n) & 0xf) << 20)
+#define SUN6I_DPHY_ANA4_REG_VTT_SET(n)		(((n) & 0x7) << 17)
 #define SUN6I_DPHY_ANA4_REG_CKDV(n)		(((n) & 0x1f) << 12)
 #define SUN6I_DPHY_ANA4_REG_TMSC(n)		(((n) & 3) << 10)
 #define SUN6I_DPHY_ANA4_REG_TMSD(n)		(((n) & 3) << 8)
@@ -109,6 +122,56 @@
 
 #define SUN6I_DPHY_DBG5_REG		0xf4
 
+#define SUN50I_DPHY_TX_SLEW_REG0	0xf8
+#define SUN50I_DPHY_TX_SLEW_REG1	0xfc
+#define SUN50I_DPHY_TX_SLEW_REG2	0x100
+
+#define SUN50I_DPHY_PLL_REG0		0x104
+#define SUN50I_DPHY_PLL_REG0_CP36_EN		BIT(23)
+#define SUN50I_DPHY_PLL_REG0_LDO_EN		BIT(22)
+#define SUN50I_DPHY_PLL_REG0_EN_LVS		BIT(21)
+#define SUN50I_DPHY_PLL_REG0_PLL_EN		BIT(20)
+#define SUN50I_DPHY_PLL_REG0_P(n)		(((n) & 0xf) << 16)
+#define SUN50I_DPHY_PLL_REG0_N(n)		(((n) & 0xff) << 8)
+#define SUN50I_DPHY_PLL_REG0_NDET		BIT(7)
+#define SUN50I_DPHY_PLL_REG0_TDIV		BIT(6)
+#define SUN50I_DPHY_PLL_REG0_M0(n)		(((n) & 3) << 4)
+#define SUN50I_DPHY_PLL_REG0_M1(n)		((n) & 0xf)
+
+#define SUN50I_DPHY_PLL_REG1		0x108
+#define SUN50I_DPHY_PLL_REG1_UNLOCK_MDSEL(n)	(((n) & 3) << 14)
+#define SUN50I_DPHY_PLL_REG1_LOCKMDSEL		BIT(13)
+#define SUN50I_DPHY_PLL_REG1_LOCKDET_EN		BIT(12)
+#define SUN50I_DPHY_PLL_REG1_VSETA(n)		(((n) & 0x7) << 9)
+#define SUN50I_DPHY_PLL_REG1_VSETD(n)		(((n) & 0x7) << 6)
+#define SUN50I_DPHY_PLL_REG1_LPF_SW		BIT(5)
+#define SUN50I_DPHY_PLL_REG1_ICP_SEL(n)		(((n) & 3) << 3)
+#define SUN50I_DPHY_PLL_REG1_ATEST_SEL(n)	(((n) & 3) << 1)
+#define SUN50I_DPHY_PLL_REG1_TEST_EN		BIT(0)
+
+#define SUN50I_DPHY_PLL_REG2		0x10c
+#define SUN50I_DPHY_PLL_REG2_SDM_EN		BIT(31)
+#define SUN50I_DPHY_PLL_REG2_FF_EN		BIT(30)
+#define SUN50I_DPHY_PLL_REG2_SS_EN		BIT(29)
+#define SUN50I_DPHY_PLL_REG2_SS_FRAC(n)		(((n) & 0x1ff) << 20)
+#define SUN50I_DPHY_PLL_REG2_SS_INT(n)		(((n) & 0xff) << 12)
+#define SUN50I_DPHY_PLL_REG2_FRAC(n)		((n) & 0xfff)
+
+#define SUN50I_COMBO_PHY_REG0		0x110
+#define SUN50I_COMBO_PHY_REG0_EN_TEST_COMBOLDO	BIT(5)
+#define SUN50I_COMBO_PHY_REG0_EN_TEST_0P8	BIT(4)
+#define SUN50I_COMBO_PHY_REG0_EN_MIPI		BIT(3)
+#define SUN50I_COMBO_PHY_REG0_EN_LVDS		BIT(2)
+#define SUN50I_COMBO_PHY_REG0_EN_COMBOLDO	BIT(1)
+#define SUN50I_COMBO_PHY_REG0_EN_CP		BIT(0)
+
+#define SUN50I_COMBO_PHY_REG1		0x114
+#define SUN50I_COMBO_PHY_REG2_REG_VREF1P6(n)	(((n) & 0x7) << 4)
+#define SUN50I_COMBO_PHY_REG2_REG_VREF0P8(n)	((n) & 0x7)
+
+#define SUN50I_COMBO_PHY_REG2		0x118
+#define SUN50I_COMBO_PHY_REG2_HS_STOP_DLY(n)	((n) & 0xff)
+
 enum sun6i_dphy_direction {
 	SUN6I_DPHY_DIRECTION_TX,
 	SUN6I_DPHY_DIRECTION_RX,
@@ -196,6 +259,76 @@ static void sun6i_a31_mipi_dphy_tx_power_on(struct sun6i_dphy *dphy)
 	udelay(1);
 }
 
+static void sun50i_a100_mipi_dphy_tx_power_on(struct sun6i_dphy *dphy)
+{
+	unsigned long mipi_symbol_rate = dphy->config.hs_clk_rate;
+	unsigned int div, n;
+
+	regmap_write(dphy->regs, SUN6I_DPHY_ANA4_REG,
+		     SUN6I_DPHY_ANA4_REG_IB(2) |
+		     SUN6I_DPHY_ANA4_REG_DMPLVD(4) |
+		     SUN6I_DPHY_ANA4_REG_VTT_SET(3) |
+		     SUN6I_DPHY_ANA4_REG_CKDV(3) |
+		     SUN6I_DPHY_ANA4_REG_TMSD(1) |
+		     SUN6I_DPHY_ANA4_REG_TMSC(1) |
+		     SUN6I_DPHY_ANA4_REG_TXPUSD(2) |
+		     SUN6I_DPHY_ANA4_REG_TXPUSC(3) |
+		     SUN6I_DPHY_ANA4_REG_TXDNSD(2) |
+		     SUN6I_DPHY_ANA4_REG_TXDNSC(3));
+
+	regmap_update_bits(dphy->regs, SUN6I_DPHY_ANA2_REG,
+			   SUN6I_DPHY_ANA2_EN_CK_CPU,
+			   SUN6I_DPHY_ANA2_EN_CK_CPU);
+
+	regmap_update_bits(dphy->regs, SUN6I_DPHY_ANA2_REG,
+			   SUN6I_DPHY_ANA2_REG_ENIB,
+			   SUN6I_DPHY_ANA2_REG_ENIB);
+
+	regmap_write(dphy->regs, SUN6I_DPHY_ANA3_REG,
+		     SUN6I_DPHY_ANA3_EN_LDOR |
+		     SUN6I_DPHY_ANA3_EN_LDOC |
+		     SUN6I_DPHY_ANA3_EN_LDOD);
+
+	regmap_write(dphy->regs, SUN6I_DPHY_ANA0_REG,
+		     SUN6I_DPHY_ANA0_REG_PLR(4) |
+		     SUN6I_DPHY_ANA0_REG_SFB(1));
+
+	regmap_write(dphy->regs, SUN50I_COMBO_PHY_REG0,
+		     SUN50I_COMBO_PHY_REG0_EN_CP);
+
+	/* Choose a divider to limit the VCO frequency to around 2 GHz. */
+	div = 16 >> order_base_2(DIV_ROUND_UP(mipi_symbol_rate, 264000000));
+	n = mipi_symbol_rate * div / 24000000;
+
+	regmap_write(dphy->regs, SUN50I_DPHY_PLL_REG0,
+		     SUN50I_DPHY_PLL_REG0_CP36_EN |
+		     SUN50I_DPHY_PLL_REG0_LDO_EN |
+		     SUN50I_DPHY_PLL_REG0_EN_LVS |
+		     SUN50I_DPHY_PLL_REG0_PLL_EN |
+		     SUN50I_DPHY_PLL_REG0_NDET |
+		     SUN50I_DPHY_PLL_REG0_P((div - 1) % 8) |
+		     SUN50I_DPHY_PLL_REG0_N(n) |
+		     SUN50I_DPHY_PLL_REG0_M0((div - 1) / 8) |
+		     SUN50I_DPHY_PLL_REG0_M1(2));
+
+	/* Disable sigma-delta modulation. */
+	regmap_write(dphy->regs, SUN50I_DPHY_PLL_REG2, 0);
+
+	regmap_update_bits(dphy->regs, SUN6I_DPHY_ANA4_REG,
+			   SUN6I_DPHY_ANA4_REG_EN_MIPI,
+			   SUN6I_DPHY_ANA4_REG_EN_MIPI);
+
+	regmap_update_bits(dphy->regs, SUN50I_COMBO_PHY_REG0,
+			   SUN50I_COMBO_PHY_REG0_EN_MIPI |
+			   SUN50I_COMBO_PHY_REG0_EN_COMBOLDO,
+			   SUN50I_COMBO_PHY_REG0_EN_MIPI |
+			   SUN50I_COMBO_PHY_REG0_EN_COMBOLDO);
+
+	regmap_write(dphy->regs, SUN50I_COMBO_PHY_REG2,
+		     SUN50I_COMBO_PHY_REG2_HS_STOP_DLY(20));
+	udelay(1);
+}
+
 static int sun6i_dphy_tx_power_on(struct sun6i_dphy *dphy)
 {
 	u8 lanes_mask = GENMASK(dphy->config.lanes - 1, 0);
@@ -408,7 +541,7 @@ static const struct regmap_config sun6i_dphy_regmap_config = {
 	.reg_bits	= 32,
 	.val_bits	= 32,
 	.reg_stride	= 4,
-	.max_register	= SUN6I_DPHY_DBG5_REG,
+	.max_register	= SUN50I_COMBO_PHY_REG2,
 	.name		= "mipi-dphy",
 };
 
@@ -484,11 +617,19 @@ static const struct sun6i_dphy_variant sun6i_a31_mipi_dphy_variant = {
 	.rx_supported	= true,
 };
 
+static const struct sun6i_dphy_variant sun50i_a100_mipi_dphy_variant = {
+	.tx_power_on	= sun50i_a100_mipi_dphy_tx_power_on,
+};
+
 static const struct of_device_id sun6i_dphy_of_table[] = {
 	{
 		.compatible	= "allwinner,sun6i-a31-mipi-dphy",
 		.data		= &sun6i_a31_mipi_dphy_variant,
 	},
+	{
+		.compatible	= "allwinner,sun50i-a100-mipi-dphy",
+		.data		= &sun50i_a100_mipi_dphy_variant,
+	},
 	{ }
 };
 MODULE_DEVICE_TABLE(of, sun6i_dphy_of_table);