PCI: kirin: Use regmap for APB registers

The PHY layer need to access APB registers too, for Kirin 970.  So place
them into a named regmap.

Link: https://lore.kernel.org/r/daf0e4bda5a69a5ac8484e70f09351a959805c8c.1634812676.git.mchehab+huawei@kernel.orgSigned-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Xiaowei Song <songxiaowei@hisilicon.com>

drivers/pci/controller/dwc/pcie-kirin.c

@@ -61,8 +61,8 @@ struct kirin_pcie {
 	enum pcie_kirin_phy_type	type;
 
 	struct dw_pcie	*pci;
+	struct regmap   *apb;
 	struct phy	*phy;
-	void __iomem	*apb_base;
 	void		*phy_priv;	/* only for PCIE_KIRIN_INTERNAL_PHY */
 };
 
@@ -340,25 +340,27 @@ static int hi3660_pcie_phy_init(struct platform_device *pdev,
  * The non-PHY part starts here
  */
 
-/* Registers in PCIeCTRL */
-static inline void kirin_apb_ctrl_writel(struct kirin_pcie *kirin_pcie,
-					 u32 val, u32 reg)
-{
-	writel(val, kirin_pcie->apb_base + reg);
-}
-
-static inline u32 kirin_apb_ctrl_readl(struct kirin_pcie *kirin_pcie, u32 reg)
-{
-	return readl(kirin_pcie->apb_base + reg);
-}
+static const struct regmap_config pcie_kirin_regmap_conf = {
+	.name = "kirin_pcie_apb",
+	.reg_bits = 32,
+	.val_bits = 32,
+	.reg_stride = 4,
+};
 
 static long kirin_pcie_get_resource(struct kirin_pcie *kirin_pcie,
 				    struct platform_device *pdev)
 {
-	kirin_pcie->apb_base =
-		devm_platform_ioremap_resource_byname(pdev, "apb");
-	if (IS_ERR(kirin_pcie->apb_base))
-		return PTR_ERR(kirin_pcie->apb_base);
+	struct device *dev = &pdev->dev;
+	void __iomem *apb_base;
+
+	apb_base = devm_platform_ioremap_resource_byname(pdev, "apb");
+	if (IS_ERR(apb_base))
+		return PTR_ERR(apb_base);
+
+	kirin_pcie->apb = devm_regmap_init_mmio(dev, apb_base,
+						&pcie_kirin_regmap_conf);
+	if (IS_ERR(kirin_pcie->apb))
+		return PTR_ERR(kirin_pcie->apb);
 
 	return 0;
 }
@@ -368,13 +370,13 @@ static void kirin_pcie_sideband_dbi_w_mode(struct kirin_pcie *kirin_pcie,
 {
 	u32 val;
 
-	val = kirin_apb_ctrl_readl(kirin_pcie, SOC_PCIECTRL_CTRL0_ADDR);
+	regmap_read(kirin_pcie->apb, SOC_PCIECTRL_CTRL0_ADDR, &val);
 	if (on)
 		val = val | PCIE_ELBI_SLV_DBI_ENABLE;
 	else
 		val = val & ~PCIE_ELBI_SLV_DBI_ENABLE;
 
-	kirin_apb_ctrl_writel(kirin_pcie, val, SOC_PCIECTRL_CTRL0_ADDR);
+	regmap_write(kirin_pcie->apb, SOC_PCIECTRL_CTRL0_ADDR, val);
 }
 
 static void kirin_pcie_sideband_dbi_r_mode(struct kirin_pcie *kirin_pcie,
@@ -382,13 +384,13 @@ static void kirin_pcie_sideband_dbi_r_mode(struct kirin_pcie *kirin_pcie,
 {
 	u32 val;
 
-	val = kirin_apb_ctrl_readl(kirin_pcie, SOC_PCIECTRL_CTRL1_ADDR);
+	regmap_read(kirin_pcie->apb, SOC_PCIECTRL_CTRL1_ADDR, &val);
 	if (on)
 		val = val | PCIE_ELBI_SLV_DBI_ENABLE;
 	else
 		val = val & ~PCIE_ELBI_SLV_DBI_ENABLE;
 
-	kirin_apb_ctrl_writel(kirin_pcie, val, SOC_PCIECTRL_CTRL1_ADDR);
+	regmap_write(kirin_pcie->apb, SOC_PCIECTRL_CTRL1_ADDR, val);
 }
 
 static int kirin_pcie_rd_own_conf(struct pci_bus *bus, unsigned int devfn,
@@ -448,8 +450,9 @@ static void kirin_pcie_write_dbi(struct dw_pcie *pci, void __iomem *base,
 static int kirin_pcie_link_up(struct dw_pcie *pci)
 {
 	struct kirin_pcie *kirin_pcie = to_kirin_pcie(pci);
-	u32 val = kirin_apb_ctrl_readl(kirin_pcie, PCIE_APB_PHY_STATUS0);
+	u32 val;
 
+	regmap_read(kirin_pcie->apb, PCIE_APB_PHY_STATUS0, &val);
 	if ((val & PCIE_LINKUP_ENABLE) == PCIE_LINKUP_ENABLE)
 		return 1;
 
@@ -461,8 +464,8 @@ static int kirin_pcie_start_link(struct dw_pcie *pci)
 	struct kirin_pcie *kirin_pcie = to_kirin_pcie(pci);
 
 	/* assert LTSSM enable */
-	kirin_apb_ctrl_writel(kirin_pcie, PCIE_LTSSM_ENABLE_BIT,
-			      PCIE_APP_LTSSM_ENABLE);
+	regmap_write(kirin_pcie->apb, PCIE_APP_LTSSM_ENABLE,
+		     PCIE_LTSSM_ENABLE_BIT);
 
 	return 0;
 }