x86: pci: Drop the first parameter in pci_x86_r/w_config()

This parameter is needed by the PCI driver-mode interface but is always
NULL on x86. There are a number of calls to this function so it makes
sense to minimise the parameters.

Adjust the x86 function to omit the first parameter, and introduce stub
functions to handle the conversion.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
[bmeng: rebase the patch against u-boot-x86/next to get it applied cleanly]
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>

arch/x86/cpu/broadwell/cpu.c

@@ -103,11 +103,8 @@ int print_cpuinfo(void)
 
 void board_debug_uart_init(void)
 {
-	struct udevice *bus = NULL;
-
 	/* com1 / com2 decode range */
-	pci_x86_write_config(bus, PCH_DEV_LPC, LPC_IO_DEC, 1 << 4, PCI_SIZE_16);
+	pci_x86_write_config(PCH_DEV_LPC, LPC_IO_DEC, 1 << 4, PCI_SIZE_16);
 
-	pci_x86_write_config(bus, PCH_DEV_LPC, LPC_EN, COMA_LPC_EN,
-			     PCI_SIZE_16);
+	pci_x86_write_config(PCH_DEV_LPC, LPC_EN, COMA_LPC_EN, PCI_SIZE_16);
 }

arch/x86/cpu/ivybridge/cpu.c

@@ -199,6 +199,5 @@ int print_cpuinfo(void)
 void board_debug_uart_init(void)
 {
 	/* This enables the debug UART */
-	pci_x86_write_config(NULL, PCH_LPC_DEV, LPC_EN, COMA_LPC_EN,
-			     PCI_SIZE_16);
+	pci_x86_write_config(PCH_LPC_DEV, LPC_EN, COMA_LPC_EN, PCI_SIZE_16);
 }

arch/x86/cpu/pci.c

@@ -16,12 +16,8 @@
 #include <asm/io.h>
 #include <asm/pci.h>
 
-/*
- * TODO(sjg@chromium.org): Drop the first parameter from each of these
- * functions since it is not used.
- */
-int pci_x86_read_config(struct udevice *bus, pci_dev_t bdf, uint offset,
-			ulong *valuep, enum pci_size_t size)
+int pci_x86_read_config(pci_dev_t bdf, uint offset, ulong *valuep,
+			enum pci_size_t size)
 {
 	outl(bdf | (offset & 0xfc) | PCI_CFG_EN, PCI_REG_ADDR);
 	switch (size) {
@@ -39,8 +35,8 @@ int pci_x86_read_config(struct udevice *bus, pci_dev_t bdf, uint offset,
 	return 0;
 }
 
-int pci_x86_write_config(struct udevice *bus, pci_dev_t bdf, uint offset,
-			 ulong value, enum pci_size_t size)
+int pci_x86_write_config(pci_dev_t bdf, uint offset, ulong value,
+			 enum pci_size_t size)
 {
 	outl(bdf | (offset & 0xfc) | PCI_CFG_EN, PCI_REG_ADDR);
 	switch (size) {
@@ -58,19 +54,19 @@ int pci_x86_write_config(struct udevice *bus, pci_dev_t bdf, uint offset,
 	return 0;
 }
 
-int pci_x86_clrset_config(struct udevice *bus, pci_dev_t bdf, uint offset,
-			  ulong clr, ulong set, enum pci_size_t size)
+int pci_x86_clrset_config(pci_dev_t bdf, uint offset, ulong clr, ulong set,
+			  enum pci_size_t size)
 {
 	ulong value;
 	int ret;
 
-	ret = pci_x86_read_config(bus, bdf, offset, &value, size);
+	ret = pci_x86_read_config(bdf, offset, &value, size);
 	if (ret)
 		return ret;
 	value &= ~clr;
 	value |= set;
 
-	return pci_x86_write_config(bus, bdf, offset, value, size);
+	return pci_x86_write_config(bdf, offset, value, size);
 }
 
 void pci_assign_irqs(int bus, int device, u8 irq[4])

arch/x86/include/asm/pci.h

@@ -22,30 +22,28 @@
  *
  * This function can be called before PCI is set up in driver model.
  *
- * @bus:	Bus to read from (ignored, can be NULL)
  * @bdf:	PCI device address: bus, device and function -see PCI_BDF()
  * @offset:	Register offset to read
  * @valuep:	Place to put the returned value
  * @size:	Access size
  * @return 0 if OK, -ve on error
  */
-int pci_x86_read_config(struct udevice *bus, pci_dev_t bdf, uint offset,
-			ulong *valuep, enum pci_size_t size);
+int pci_x86_read_config(pci_dev_t bdf, uint offset, ulong *valuep,
+			enum pci_size_t size);
 
 /**
  * pci_bus_write_config() - Write a configuration value to a device
  *
  * This function can be called before PCI is set up in driver model.
  *
- * @bus:	Bus to read from (ignored, can be NULL)
  * @bdf:	PCI device address: bus, device and function -see PCI_BDF()
  * @offset:	Register offset to write
  * @value:	Value to write
  * @size:	Access size
  * @return 0 if OK, -ve on error
  */
-int pci_x86_write_config(struct udevice *bus, pci_dev_t bdf, uint offset,
-			 ulong value, enum pci_size_t size);
+int pci_x86_write_config(pci_dev_t bdf, uint offset, ulong value,
+			 enum pci_size_t size);
 
 /**
  * pci_bus_clrset_config32() - Update a configuration value for a device
@@ -53,15 +51,14 @@ int pci_x86_write_config(struct udevice *bus, pci_dev_t bdf, uint offset,
  * The register at @offset is updated to (oldvalue & ~clr) | set. This function
  * can be called before PCI is set up in driver model.
  *
- * @bus:	Bus to read from (ignored, can be NULL)
  * @bdf:	PCI device address: bus, device and function -see PCI_BDF()
  * @offset:	Register offset to update
  * @clr:	Bits to clear
  * @set:	Bits to set
  * @return 0 if OK, -ve on error
  */
-int pci_x86_clrset_config(struct udevice *bus, pci_dev_t bdf, uint offset,
-			  ulong clr, ulong set, enum pci_size_t size);
+int pci_x86_clrset_config(pci_dev_t bdf, uint offset, ulong clr, ulong set,
+			  enum pci_size_t size);
 
 /**
  * Assign IRQ number to a PCI device

drivers/pci/pci_x86.c

@@ -8,9 +8,21 @@
 #include <pci.h>
 #include <asm/pci.h>
 
+static int _pci_x86_read_config(struct udevice *bus, pci_dev_t bdf, uint offset,
+				ulong *valuep, enum pci_size_t size)
+{
+	return pci_x86_read_config(bdf, offset, valuep, size);
+}
+
+static int _pci_x86_write_config(struct udevice *bus, pci_dev_t bdf,
+				 uint offset, ulong value, enum pci_size_t size)
+{
+	return pci_x86_write_config(bdf, offset, value, size);
+}
+
 static const struct dm_pci_ops pci_x86_ops = {
-	.read_config	= pci_x86_read_config,
-	.write_config	= pci_x86_write_config,
+	.read_config	= _pci_x86_read_config,
+	.write_config	= _pci_x86_write_config,
 };
 
 static const struct udevice_id pci_x86_ids[] = {