dm: sandbox: pci: Add PCI support for sandbox

Add the required header information, device tree nodes and I/O accessor
functions to support PCI on sandbox. All devices are emulated by drivers
which can be added as required for testing or development.

Signed-off-by: Simon Glass <sjg@chromium.org>

arch/sandbox/include/asm/io.h

@@ -22,10 +22,7 @@ void *map_physmem(phys_addr_t paddr, unsigned long len, unsigned long flags);
 /*
  * Take down a mapping set up by map_physmem().
  */
-static inline void unmap_physmem(void *vaddr, unsigned long flags)
-{
-
-}
+void unmap_physmem(const void *vaddr, unsigned long flags);
 
 /* For sandbox, we want addresses to point into our RAM buffer */
 static inline void *map_sysmem(phys_addr_t paddr, unsigned long len)
@@ -33,8 +30,10 @@ static inline void *map_sysmem(phys_addr_t paddr, unsigned long len)
 	return map_physmem(paddr, len, MAP_WRBACK);
 }
 
+/* Remove a previous mapping */
 static inline void unmap_sysmem(const void *vaddr)
 {
+	unmap_physmem(vaddr, MAP_WRBACK);
 }
 
 /* Map from a pointer to our RAM buffer */
@@ -48,6 +47,15 @@ phys_addr_t map_to_sysmem(const void *ptr);
 #define writew(v, addr)
 #define writel(v, addr)
 
+/* I/O access functions */
+int inl(unsigned int addr);
+int inw(unsigned int addr);
+int inb(unsigned int addr);
+
+void outl(unsigned int value, unsigned int addr);
+void outw(unsigned int value, unsigned int addr);
+void outb(unsigned int value, unsigned int addr);
+
 #include <iotrace.h>
 
 #endif

arch/sandbox/include/asm/processor.h

@@ -0,0 +1,12 @@
+/*
+ * Copyright (c) 2014 Google, Inc
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#ifndef _ASM_PROCESSOR_H
+#define _ASM_PROCESSOR_H
+
+/* This file is required for PCI */
+
+#endif

arch/sandbox/include/asm/test.h

@@ -10,7 +10,12 @@
 #define __ASM_TEST_H
 
 /* The sandbox driver always permits an I2C device with this address */
-#define SANDBOX_I2C_TEST_ADDR	0x59
+#define SANDBOX_I2C_TEST_ADDR		0x59
+
+#define SANDBOX_PCI_VENDOR_ID		0x1234
+#define SANDBOX_PCI_DEVICE_ID		0x5678
+#define SANDBOX_PCI_CLASS_CODE		PCI_CLASS_CODE_COMM
+#define SANDBOX_PCI_CLASS_SUB_CODE	PCI_CLASS_SUB_CODE_COMM_SERIAL
 
 enum sandbox_i2c_eeprom_test_mode {
 	SIE_TEST_MODE_NONE,

arch/sandbox/include/asm/u-boot-sandbox.h

@@ -27,4 +27,52 @@ int cleanup_before_linux(void);
 /* drivers/video/sandbox_sdl.c */
 int sandbox_lcd_sdl_early_init(void);
 
+/**
+ * pci_map_physmem() - map a PCI device into memory
+ *
+ * This is used on sandbox to map a device into memory so that it can be
+ * used with normal memory access. After this call, some part of the device's
+ * internal structure becomes visible.
+ *
+ * This function is normally called from sandbox's map_sysmem() automatically.
+ *
+ * @paddr:	Physical memory address, normally corresponding to a PCI BAR
+ * @lenp:	On entry, the size of the area to map, On exit it is updated
+ *		to the size actually mapped, which may be less if the device
+ *		has less space
+ * @devp:	Returns the device which mapped into this space
+ * @ptrp:	Returns a pointer to the mapped address. The device's space
+ *		can be accessed as @lenp bytes starting here
+ * @return 0 if OK, -ve on error
+ */
+int pci_map_physmem(phys_addr_t paddr, unsigned long *lenp,
+		    struct udevice **devp, void **ptrp);
+
+/**
+ * pci_unmap_physmem() - undo a memory mapping
+ *
+ * This must be called after pci_map_physmem() to undo the mapping.
+ *
+ * @paddr:	Physical memory address, as passed to pci_map_physmem()
+ * @len:	Size of area mapped, as returned by pci_map_physmem()
+ * @dev:	Device to unmap, as returned by pci_map_physmem()
+ * @return 0 if OK, -ve on error
+ */
+int pci_unmap_physmem(const void *addr, unsigned long len,
+		      struct udevice *dev);
+
+/**
+ * sandbox_set_enable_pci_map() - Enable / disable PCI address mapping
+ *
+ * Since address mapping involves calling every driver, provide a way to
+ * enable and disable this. It can be handled automatically by the emulator
+ * uclass, which knows if any emulators are currently active.
+ *
+ * If this is disabled, pci_map_physmem() will not be called from
+ * map_sysmem().
+ *
+ * @enable: 0 to disable, 1 to enable
+ */
+void sandbox_set_enable_pci_map(int enable);
+
 #endif	/* _U_BOOT_SANDBOX_H_ */