PCI: dwc: Drop enum dw_pcie_as_type in favor of PCIE_ATU_TYPE_MEM/IO

Previously dw_pcie_ep_set_bar() converted the BAR PCI_BASE_ADDRESS_SPACE
bit to the internal dw_pcie_as_type enum (DW_PCIE_AS_MEM, DW_PCIE_AS_IO)
and passed it down to dw_pcie_prog_inbound_atu(), which converted the enum
to the PCIE_ATU_TYPE_MEM/PCIE_ATU_TYPE_IO values needed to program the ATU
registers.

Simplify the code by dropping the dw_pcie_as_type enum and passing
PCIE_ATU_TYPE_MEM or PCIE_ATU_TYPE_IO directly.

Reorder inbound ATU function arguments to match the outbound functions,
with address-related parameters at the end.

[bhelgaas: commit log]
Link: https://lore.kernel.org/r/20220624143947.8991-10-Sergey.Semin@baikalelectronics.ru
Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>

3 files changed, 15 insertions, 50 deletions

diff --git a/drivers/pci/controller/dwc/pcie-designware-ep.c b/drivers/pci/controller/dwc/pcie-designware-ep.c
index ffbd3af6d65a..5a158813f687 100644
--- a/drivers/pci/controller/dwc/pcie-designware-ep.c
+++ b/drivers/pci/controller/dwc/pcie-designware-ep.c
@@ -154,9 +154,8 @@ static int dw_pcie_ep_write_header(struct pci_epc *epc, u8 func_no, u8 vfunc_no,
 	return 0;
 }
 
-static int dw_pcie_ep_inbound_atu(struct dw_pcie_ep *ep, u8 func_no,
-				  enum pci_barno bar, dma_addr_t cpu_addr,
-				  enum dw_pcie_as_type as_type)
+static int dw_pcie_ep_inbound_atu(struct dw_pcie_ep *ep, u8 func_no, int type,
+				  dma_addr_t cpu_addr, enum pci_barno bar)
 {
 	int ret;
 	u32 free_win;
@@ -168,8 +167,8 @@ static int dw_pcie_ep_inbound_atu(struct dw_pcie_ep *ep, u8 func_no,
 		return -EINVAL;
 	}
 
-	ret = dw_pcie_prog_inbound_atu(pci, func_no, free_win, bar, cpu_addr,
-				       as_type);
+	ret = dw_pcie_prog_inbound_atu(pci, func_no, free_win, type,
+				       cpu_addr, bar);
 	if (ret < 0) {
 		dev_err(pci->dev, "Failed to program IB window\n");
 		return ret;
@@ -221,27 +220,25 @@ static void dw_pcie_ep_clear_bar(struct pci_epc *epc, u8 func_no, u8 vfunc_no,
 static int dw_pcie_ep_set_bar(struct pci_epc *epc, u8 func_no, u8 vfunc_no,
 			      struct pci_epf_bar *epf_bar)
 {
-	int ret;
 	struct dw_pcie_ep *ep = epc_get_drvdata(epc);
 	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
 	enum pci_barno bar = epf_bar->barno;
 	size_t size = epf_bar->size;
 	int flags = epf_bar->flags;
-	enum dw_pcie_as_type as_type;
-	u32 reg;
 	unsigned int func_offset = 0;
+	int ret, type;
+	u32 reg;
 
 	func_offset = dw_pcie_ep_func_select(ep, func_no);
 
 	reg = PCI_BASE_ADDRESS_0 + (4 * bar) + func_offset;
 
 	if (!(flags & PCI_BASE_ADDRESS_SPACE))
-		as_type = DW_PCIE_AS_MEM;
+		type = PCIE_ATU_TYPE_MEM;
 	else
-		as_type = DW_PCIE_AS_IO;
+		type = PCIE_ATU_TYPE_IO;
 
-	ret = dw_pcie_ep_inbound_atu(ep, func_no, bar,
-				     epf_bar->phys_addr, as_type);
+	ret = dw_pcie_ep_inbound_atu(ep, func_no, type, epf_bar->phys_addr, bar);
 	if (ret)
 		return ret;
 
diff --git a/drivers/pci/controller/dwc/pcie-designware.c b/drivers/pci/controller/dwc/pcie-designware.c
index bd575ad32bc4..0e846c53dfb5 100644
--- a/drivers/pci/controller/dwc/pcie-designware.c
+++ b/drivers/pci/controller/dwc/pcie-designware.c
@@ -421,10 +421,9 @@ static void dw_pcie_writel_ib_unroll(struct dw_pcie *pci, u32 index, u32 reg,
 }
 
 static int dw_pcie_prog_inbound_atu_unroll(struct dw_pcie *pci, u8 func_no,
-					   int index, int bar, u64 cpu_addr,
-					   enum dw_pcie_as_type as_type)
+					   int index, int type,
+					   u64 cpu_addr, u8 bar)
 {
-	int type;
 	u32 retries, val;
 
 	dw_pcie_writel_ib_unroll(pci, index, PCIE_ATU_UNR_LOWER_TARGET,
@@ -432,17 +431,6 @@ static int dw_pcie_prog_inbound_atu_unroll(struct dw_pcie *pci, u8 func_no,
 	dw_pcie_writel_ib_unroll(pci, index, PCIE_ATU_UNR_UPPER_TARGET,
 				 upper_32_bits(cpu_addr));
 
-	switch (as_type) {
-	case DW_PCIE_AS_MEM:
-		type = PCIE_ATU_TYPE_MEM;
-		break;
-	case DW_PCIE_AS_IO:
-		type = PCIE_ATU_TYPE_IO;
-		break;
-	default:
-		return -EINVAL;
-	}
-
 	dw_pcie_writel_ib_unroll(pci, index, PCIE_ATU_UNR_REGION_CTRL1, type |
 				 PCIE_ATU_FUNC_NUM(func_no));
 	dw_pcie_writel_ib_unroll(pci, index, PCIE_ATU_UNR_REGION_CTRL2,
@@ -468,32 +456,19 @@ static int dw_pcie_prog_inbound_atu_unroll(struct dw_pcie *pci, u8 func_no,
 }
 
 int dw_pcie_prog_inbound_atu(struct dw_pcie *pci, u8 func_no, int index,
-			     int bar, u64 cpu_addr,
-			     enum dw_pcie_as_type as_type)
+			     int type, u64 cpu_addr, u8 bar)
 {
-	int type;
 	u32 retries, val;
 
 	if (pci->iatu_unroll_enabled)
-		return dw_pcie_prog_inbound_atu_unroll(pci, func_no, index, bar,
-						       cpu_addr, as_type);
+		return dw_pcie_prog_inbound_atu_unroll(pci, func_no, index,
+						       type, cpu_addr, bar);
 
 	dw_pcie_writel_dbi(pci, PCIE_ATU_VIEWPORT, PCIE_ATU_REGION_INBOUND |
 			   index);
 	dw_pcie_writel_dbi(pci, PCIE_ATU_LOWER_TARGET, lower_32_bits(cpu_addr));
 	dw_pcie_writel_dbi(pci, PCIE_ATU_UPPER_TARGET, upper_32_bits(cpu_addr));
 
-	switch (as_type) {
-	case DW_PCIE_AS_MEM:
-		type = PCIE_ATU_TYPE_MEM;
-		break;
-	case DW_PCIE_AS_IO:
-		type = PCIE_ATU_TYPE_IO;
-		break;
-	default:
-		return -EINVAL;
-	}
-
 	dw_pcie_writel_dbi(pci, PCIE_ATU_CR1, type |
 			   PCIE_ATU_FUNC_NUM(func_no));
 	dw_pcie_writel_dbi(pci, PCIE_ATU_CR2, PCIE_ATU_ENABLE |
diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h
index 7f1c00fa084d..c63ace3c3f25 100644
--- a/drivers/pci/controller/dwc/pcie-designware.h
+++ b/drivers/pci/controller/dwc/pcie-designware.h
@@ -228,12 +228,6 @@ struct dw_pcie_rp {
 	DECLARE_BITMAP(msi_irq_in_use, MAX_MSI_IRQS);
 };
 
-enum dw_pcie_as_type {
-	DW_PCIE_AS_UNKNOWN,
-	DW_PCIE_AS_MEM,
-	DW_PCIE_AS_IO,
-};
-
 struct dw_pcie_ep_ops {
 	void	(*ep_init)(struct dw_pcie_ep *ep);
 	int	(*raise_irq)(struct dw_pcie_ep *ep, u8 func_no,
@@ -331,8 +325,7 @@ void dw_pcie_prog_ep_outbound_atu(struct dw_pcie *pci, u8 func_no, int index,
 				  int type, u64 cpu_addr, u64 pci_addr,
 				  u64 size);
 int dw_pcie_prog_inbound_atu(struct dw_pcie *pci, u8 func_no, int index,
-			     int bar, u64 cpu_addr,
-			     enum dw_pcie_as_type as_type);
+			     int type, u64 cpu_addr, u8 bar);
 void dw_pcie_disable_atu(struct dw_pcie *pci, int index,
 			 enum dw_pcie_region_type type);
 void dw_pcie_setup(struct dw_pcie *pci);