[PATCH v2 03/11] net: stmmac: dwmac-stm32: rework glue to simplify management

[Christophe Roullier <christophe.roullier@foss.st.com>]

Change glue to be more generic and manage easily next stm32 products.
The goal of this commit is to have one stm32mp1_set_mode function which
can manage different STM32 SOC. SOC can have different SYSCFG register
bitfields. so in pmcsetr we defined the bitfields corresponding to the SOC.

Signed-off-by: Christophe Roullier <christophe.roullier@foss.st.com>
---
 .../net/ethernet/stmicro/stmmac/dwmac-stm32.c | 76 +++++++++++++------
 1 file changed, 51 insertions(+), 25 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c
index c92dfc4ecf57..68a02de25ac7 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c
@@ -23,10 +23,6 @@
 
 #define SYSCFG_MCU_ETH_MASK		BIT(23)
 #define SYSCFG_MP1_ETH_MASK		GENMASK(23, 16)
-#define SYSCFG_PMCCLRR_OFFSET		0x40
-
-#define SYSCFG_PMCR_ETH_CLK_SEL		BIT(16)
-#define SYSCFG_PMCR_ETH_REF_CLK_SEL	BIT(17)
 
 /* CLOCK feed to PHY*/
 #define ETH_CK_F_25M	25000000
@@ -46,9 +42,6 @@
  * RMII  |   1	 |   0	  |   0	   |  n/a  |
  *------------------------------------------
  */
-#define SYSCFG_PMCR_ETH_SEL_MII		BIT(20)
-#define SYSCFG_PMCR_ETH_SEL_RGMII	BIT(21)
-#define SYSCFG_PMCR_ETH_SEL_RMII	BIT(23)
 #define SYSCFG_PMCR_ETH_SEL_GMII	0
 #define SYSCFG_MCU_ETH_SEL_MII		0
 #define SYSCFG_MCU_ETH_SEL_RMII		1
@@ -90,19 +83,33 @@ struct stm32_dwmac {
 	int eth_ref_clk_sel_reg;
 	int irq_pwr_wakeup;
 	u32 mode_reg;		 /* MAC glue-logic mode register */
+	u32 mode_mask;
 	struct regmap *regmap;
 	u32 speed;
 	const struct stm32_ops *ops;
 	struct device *dev;
 };
 
+struct stm32_syscfg_pmcsetr {
+	u32 eth1_clk_sel;
+	u32 eth1_ref_clk_sel;
+	u32 eth1_selmii;
+	u32 eth1_sel_rgmii;
+	u32 eth1_sel_rmii;
+	u32 eth2_clk_sel;
+	u32 eth2_ref_clk_sel;
+	u32 eth2_sel_rgmii;
+	u32 eth2_sel_rmii;
+};
+
 struct stm32_ops {
 	int (*set_mode)(struct plat_stmmacenet_data *plat_dat);
 	int (*suspend)(struct stm32_dwmac *dwmac);
 	void (*resume)(struct stm32_dwmac *dwmac);
 	int (*parse_data)(struct stm32_dwmac *dwmac,
 			  struct device *dev);
-	u32 syscfg_eth_mask;
+	u32 syscfg_clr_off;
+	struct stm32_syscfg_pmcsetr pmcsetr;
 	bool clk_rx_enable_in_suspend;
 };
 
@@ -161,7 +168,7 @@ static int stm32mp1_set_mode(struct plat_stmmacenet_data *plat_dat)
 {
 	struct stm32_dwmac *dwmac = plat_dat->bsp_priv;
 	u32 reg = dwmac->mode_reg, clk_rate;
-	int val;
+	int val = 0;
 
 	clk_rate = clk_get_rate(dwmac->clk_eth_ck);
 	dwmac->enable_eth_ck = false;
@@ -169,7 +176,7 @@ static int stm32mp1_set_mode(struct plat_stmmacenet_data *plat_dat)
 	case PHY_INTERFACE_MODE_MII:
 		if (clk_rate == ETH_CK_F_25M && dwmac->ext_phyclk)
 			dwmac->enable_eth_ck = true;
-		val = SYSCFG_PMCR_ETH_SEL_MII;
+		val = dwmac->ops->pmcsetr.eth1_selmii;
 		pr_debug("SYSCFG init : PHY_INTERFACE_MODE_MII\n");
 		break;
 	case PHY_INTERFACE_MODE_GMII:
@@ -177,16 +184,17 @@ static int stm32mp1_set_mode(struct plat_stmmacenet_data *plat_dat)
 		if (clk_rate == ETH_CK_F_25M &&
 		    (dwmac->eth_clk_sel_reg || dwmac->ext_phyclk)) {
 			dwmac->enable_eth_ck = true;
-			val |= SYSCFG_PMCR_ETH_CLK_SEL;
+			val |= dwmac->ops->pmcsetr.eth1_clk_sel;
 		}
 		pr_debug("SYSCFG init : PHY_INTERFACE_MODE_GMII\n");
 		break;
 	case PHY_INTERFACE_MODE_RMII:
-		val = SYSCFG_PMCR_ETH_SEL_RMII;
+		val = dwmac->ops->pmcsetr.eth1_sel_rmii | dwmac->ops->pmcsetr.eth2_sel_rmii;
 		if ((clk_rate == ETH_CK_F_25M || clk_rate == ETH_CK_F_50M) &&
 		    (dwmac->eth_ref_clk_sel_reg || dwmac->ext_phyclk)) {
 			dwmac->enable_eth_ck = true;
-			val |= SYSCFG_PMCR_ETH_REF_CLK_SEL;
+			val |= dwmac->ops->pmcsetr.eth1_ref_clk_sel;
+			val |= dwmac->ops->pmcsetr.eth2_ref_clk_sel;
 		}
 		pr_debug("SYSCFG init : PHY_INTERFACE_MODE_RMII\n");
 		break;
@@ -194,11 +202,12 @@ static int stm32mp1_set_mode(struct plat_stmmacenet_data *plat_dat)
 	case PHY_INTERFACE_MODE_RGMII_ID:
 	case PHY_INTERFACE_MODE_RGMII_RXID:
 	case PHY_INTERFACE_MODE_RGMII_TXID:
-		val = SYSCFG_PMCR_ETH_SEL_RGMII;
+		val = dwmac->ops->pmcsetr.eth1_sel_rgmii | dwmac->ops->pmcsetr.eth2_sel_rgmii;
 		if ((clk_rate == ETH_CK_F_25M || clk_rate == ETH_CK_F_125M) &&
 		    (dwmac->eth_clk_sel_reg || dwmac->ext_phyclk)) {
 			dwmac->enable_eth_ck = true;
-			val |= SYSCFG_PMCR_ETH_CLK_SEL;
+			val |= dwmac->ops->pmcsetr.eth1_clk_sel;
+			val |= dwmac->ops->pmcsetr.eth2_clk_sel;
 		}
 		pr_debug("SYSCFG init : PHY_INTERFACE_MODE_RGMII\n");
 		break;
@@ -210,12 +219,12 @@ static int stm32mp1_set_mode(struct plat_stmmacenet_data *plat_dat)
 	}
 
 	/* Need to update PMCCLRR (clear register) */
-	regmap_write(dwmac->regmap, reg + SYSCFG_PMCCLRR_OFFSET,
-		     dwmac->ops->syscfg_eth_mask);
+	regmap_write(dwmac->regmap, reg + dwmac->ops->syscfg_clr_off,
+		     dwmac->mode_mask);
 
 	/* Update PMCSETR (set register) */
 	return regmap_update_bits(dwmac->regmap, reg,
-				 dwmac->ops->syscfg_eth_mask, val);
+				 dwmac->mode_mask, val);
 }
 
 static int stm32mcu_set_mode(struct plat_stmmacenet_data *plat_dat)
@@ -241,7 +250,7 @@ static int stm32mcu_set_mode(struct plat_stmmacenet_data *plat_dat)
 	}
 
 	return regmap_update_bits(dwmac->regmap, reg,
-				 dwmac->ops->syscfg_eth_mask, val << 23);
+				 SYSCFG_MCU_ETH_MASK, val << 23);
 }
 
 static void stm32_dwmac_clk_disable(struct stm32_dwmac *dwmac, bool suspend)
@@ -286,10 +295,17 @@ static int stm32_dwmac_parse_data(struct stm32_dwmac *dwmac,
 		return PTR_ERR(dwmac->regmap);
 
 	err = of_property_read_u32_index(np, "st,syscon", 1, &dwmac->mode_reg);
+	if (err) {
+		dev_err(dev, "Can't get sysconfig register offset (%d)\n", err);
+		return err;
+	}
+
+	dwmac->mode_mask = SYSCFG_MP1_ETH_MASK;
+	err = of_property_read_u32_index(np, "st,syscon", 2, &dwmac->mode_mask);
 	if (err)
-		dev_err(dev, "Can't get sysconfig mode offset (%d)\n", err);
+		pr_debug("Warning sysconfig register mask not set\n");
 
-	return err;
+	return 0;
 }
 
 static int stm32mp1_parse_data(struct stm32_dwmac *dwmac,
@@ -478,8 +494,7 @@ static SIMPLE_DEV_PM_OPS(stm32_dwmac_pm_ops,
 	stm32_dwmac_suspend, stm32_dwmac_resume);
 
 static struct stm32_ops stm32mcu_dwmac_data = {
-	.set_mode = stm32mcu_set_mode,
-	.syscfg_eth_mask = SYSCFG_MCU_ETH_MASK
+	.set_mode = stm32mcu_set_mode
 };
 
 static struct stm32_ops stm32mp1_dwmac_data = {
@@ -487,8 +502,19 @@ static struct stm32_ops stm32mp1_dwmac_data = {
 	.suspend = stm32mp1_suspend,
 	.resume = stm32mp1_resume,
 	.parse_data = stm32mp1_parse_data,
-	.syscfg_eth_mask = SYSCFG_MP1_ETH_MASK,
-	.clk_rx_enable_in_suspend = true
+	.clk_rx_enable_in_suspend = true,
+	.syscfg_clr_off = 0x44,
+	.pmcsetr = {
+		.eth1_clk_sel		= BIT(16),
+		.eth1_ref_clk_sel	= BIT(17),
+		.eth1_selmii		= BIT(20),
+		.eth1_sel_rgmii		= BIT(21),
+		.eth1_sel_rmii		= BIT(23),
+		.eth2_clk_sel		= 0,
+		.eth2_ref_clk_sel	= 0,
+		.eth2_sel_rgmii		= 0,
+		.eth2_sel_rmii		= 0
+	}
 };
 
 static const struct of_device_id stm32_dwmac_match[] = {
-- 
2.25.1