[PATCH] CRIS update: pci

Patches to make it possible to add PCI support.

Signed-off-by: Mikael Starvik <starvik@axis.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

include/asm-cris/dma-mapping.h

@@ -1,125 +1,179 @@
+/* DMA mapping. Nothing tricky here, just virt_to_phys */
+
 #ifndef _ASM_CRIS_DMA_MAPPING_H
 #define _ASM_CRIS_DMA_MAPPING_H
 
-#include "scatterlist.h"
+#include <linux/mm.h>
+#include <linux/kernel.h>
 
-static inline int
+#include <asm/cache.h>
-dma_supported(struct device *dev, u64 mask)
+#include <asm/io.h>
-{
+#include <asm/scatterlist.h>
-	BUG();
-	return 0;
-}
 
-static inline int
+#define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
-dma_set_mask(struct device *dev, u64 dma_mask)
+#define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
-{
-	BUG();
-	return 1;
-}
 
+#ifdef CONFIG_PCI
+void *dma_alloc_coherent(struct device *dev, size_t size,
+			   dma_addr_t *dma_handle, int flag);
+
+void dma_free_coherent(struct device *dev, size_t size,
+			 void *vaddr, dma_addr_t dma_handle);
+#else
 static inline void *
 dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle,
-		   int flag)
+                   int flag)
 {
-	BUG();
+        BUG();
-	return NULL;
+        return NULL;
 }
 
 static inline void
 dma_free_coherent(struct device *dev, size_t size, void *cpu_addr,
-		    dma_addr_t dma_handle)
+                    dma_addr_t dma_handle)
 {
-	BUG();
+        BUG();
 }
-
+#endif
 static inline dma_addr_t
-dma_map_single(struct device *dev, void *cpu_addr, size_t size,
+dma_map_single(struct device *dev, void *ptr, size_t size,
 	       enum dma_data_direction direction)
 {
-	BUG();
+	BUG_ON(direction == DMA_NONE);
-	return 0;
+	return virt_to_phys(ptr);
 }
 
 static inline void
 dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
 		 enum dma_data_direction direction)
 {
-	BUG();
+	BUG_ON(direction == DMA_NONE);
-}
-
-static inline dma_addr_t
-dma_map_page(struct device *dev, struct page *page,
-	     unsigned long offset, size_t size,
-	     enum dma_data_direction direction)
-{
-	BUG();
-	return 0;
-}
-
-static inline void
-dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size,
-	       enum dma_data_direction direction)
-{
-	BUG();
 }
 
 static inline int
 dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
 	   enum dma_data_direction direction)
 {
-	BUG();
+	printk("Map sg\n");
-	return 1;
+	return nents;
 }
 
+static inline dma_addr_t
+dma_map_page(struct device *dev, struct page *page, unsigned long offset,
+	     size_t size, enum dma_data_direction direction)
+{
+	BUG_ON(direction == DMA_NONE);
+	return page_to_phys(page) + offset;
+}
+
+static inline void
+dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size,
+	       enum dma_data_direction direction)
+{
+	BUG_ON(direction == DMA_NONE);
+}
+
+
 static inline void
 dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries,
 	     enum dma_data_direction direction)
 {
-	BUG();
+	BUG_ON(direction == DMA_NONE);
 }
 
 static inline void
-dma_sync_single(struct device *dev, dma_addr_t dma_handle, size_t size,
+dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, size_t size,
-		enum dma_data_direction direction)
+			enum dma_data_direction direction)
 {
-	BUG();
 }
 
 static inline void
-dma_sync_sg(struct device *dev, struct scatterlist *sg, int nelems,
+dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle, size_t size,
-	    enum dma_data_direction direction)
+			enum dma_data_direction direction)
 {
-	BUG();
 }
 
-/* Now for the API extensions over the pci_ one */
+static inline void
+dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle,
+			      unsigned long offset, size_t size,
+			      enum dma_data_direction direction)
+{
+}
 
-#define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
+static inline void
-#define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
+dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle,
-#define dma_is_consistent(d)	(1)
+				 unsigned long offset, size_t size,
+				 enum dma_data_direction direction)
+{
+}
+
+static inline void
+dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems,
+		    enum dma_data_direction direction)
+{
+}
+
+static inline void
+dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems,
+		    enum dma_data_direction direction)
+{
+}
+
+static inline int
+dma_mapping_error(dma_addr_t dma_addr)
+{
+	return 0;
+}
+
+static inline int
+dma_supported(struct device *dev, u64 mask)
+{
+        /*
+         * we fall back to GFP_DMA when the mask isn't all 1s,
+         * so we can't guarantee allocations that must be
+         * within a tighter range than GFP_DMA..
+         */
+        if(mask < 0x00ffffff)
+                return 0;
+
+	return 1;
+}
+
+static inline int
+dma_set_mask(struct device *dev, u64 mask)
+{
+	if(!dev->dma_mask || !dma_supported(dev, mask))
+		return -EIO;
+
+	*dev->dma_mask = mask;
+
+	return 0;
+}
 
 static inline int
 dma_get_cache_alignment(void)
 {
-	/* no easy way to get cache size on all processors, so return
-	 * the maximum possible, to be safe */
 	return (1 << L1_CACHE_SHIFT_MAX);
 }
 
-static inline void
+#define dma_is_consistent(d)	(1)
-dma_sync_single_range(struct device *dev, dma_addr_t dma_handle,
-		      unsigned long offset, size_t size,
-		      enum dma_data_direction direction)
-{
-	BUG();
-}
 
 static inline void
 dma_cache_sync(void *vaddr, size_t size,
 	       enum dma_data_direction direction)
 {
-	BUG();
 }
 
-#endif
+#define ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
+extern int
+dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
+			    dma_addr_t device_addr, size_t size, int flags);
 
+extern void
+dma_release_declared_memory(struct device *dev);
+
+extern void *
+dma_mark_declared_memory_occupied(struct device *dev,
+				  dma_addr_t device_addr, size_t size);
+
+#endif

include/asm-cris/dma.h

@@ -10,4 +10,12 @@
 
 #define MAX_DMA_ADDRESS PAGE_OFFSET
 
+/* From PCI */
+
+#ifdef CONFIG_PCI
+extern int isa_dma_bridge_buggy;
+#else
+#define isa_dma_bridge_buggy 	(0)
+#endif
+
 #endif /* _ASM_DMA_H */

include/asm-cris/io.h

@@ -3,6 +3,21 @@
 
 #include <asm/page.h>   /* for __va, __pa */
 #include <asm/arch/io.h>
+#include <linux/kernel.h>
+
+struct cris_io_operations
+{
+	u32 (*read_mem)(void *addr, int size);
+	void (*write_mem)(u32 val, int size, void *addr);
+	u32 (*read_io)(u32 port, void *addr, int size, int count);
+	void (*write_io)(u32 port, void *addr, int size, int count);
+};
+
+#ifdef CONFIG_PCI
+extern struct cris_io_operations *cris_iops;
+#else
+#define cris_iops ((struct cris_io_operations*)NULL)
+#endif
 
 /*
  * Change virtual addresses to physical addresses and vv.
@@ -18,14 +33,17 @@ extern inline void * phys_to_virt(unsigned long address)
 	return __va(address);
 }
 
-extern void * __ioremap(unsigned long offset, unsigned long size, unsigned long flags);
+extern void __iomem * __ioremap(unsigned long offset, unsigned long size, unsigned long flags);
+extern void __iomem * __ioremap_prot(unsigned long phys_addr, unsigned long size, pgprot_t prot);
 
-extern inline void * ioremap (unsigned long offset, unsigned long size)
+extern inline void __iomem * ioremap (unsigned long offset, unsigned long size)
 {
 	return __ioremap(offset, size, 0);
 }
 
-extern void iounmap(void *addr);
+extern void iounmap(volatile void * __iomem addr);
+
+extern void __iomem * ioremap_nocache(unsigned long offset, unsigned long size);
 
 /*
  * IO bus memory addresses are also 1:1 with the physical address
@@ -39,9 +57,32 @@ extern void iounmap(void *addr);
  * differently. On the CRIS architecture, we just read/write the
  * memory location directly.
  */
-#define readb(addr) (*(volatile unsigned char *) (addr))
+#ifdef CONFIG_PCI
-#define readw(addr) (*(volatile unsigned short *) (addr))
+#define PCI_SPACE(x) ((((unsigned)(x)) & 0x10000000) == 0x10000000)
-#define readl(addr) (*(volatile unsigned int *) (addr))
+#else
+#define PCI_SPACE(x) 0
+#endif
+static inline unsigned char readb(const volatile void __iomem *addr)
+{
+	if (PCI_SPACE(addr) && cris_iops)
+		return cris_iops->read_mem((void*)addr, 1);
+	else
+		return *(volatile unsigned char __force *) addr;
+}
+static inline unsigned short readw(const volatile void __iomem *addr)
+{
+	if (PCI_SPACE(addr) && cris_iops)
+		return cris_iops->read_mem((void*)addr, 2);
+	else
+		return *(volatile unsigned short __force *) addr;
+}
+static inline unsigned int readl(const volatile void __iomem *addr)
+{
+	if (PCI_SPACE(addr) && cris_iops)
+		return cris_iops->read_mem((void*)addr, 4);
+	else
+		return *(volatile unsigned int __force *) addr;
+}
 #define readb_relaxed(addr) readb(addr)
 #define readw_relaxed(addr) readw(addr)
 #define readl_relaxed(addr) readl(addr)
@@ -49,9 +90,27 @@ extern void iounmap(void *addr);
 #define __raw_readw readw
 #define __raw_readl readl
 
-#define writeb(b,addr) ((*(volatile unsigned char *) (addr)) = (b))
+static inline void writeb(unsigned char b, volatile void __iomem *addr)
-#define writew(b,addr) ((*(volatile unsigned short *) (addr)) = (b))
+{
-#define writel(b,addr) ((*(volatile unsigned int *) (addr)) = (b))
+	if (PCI_SPACE(addr) && cris_iops)
+		cris_iops->write_mem(b, 1, (void*)addr);
+	else
+		*(volatile unsigned char __force *) addr = b;
+}
+static inline void writew(unsigned short b, volatile void __iomem *addr)
+{
+	if (PCI_SPACE(addr) && cris_iops)
+		cris_iops->write_mem(b, 2, (void*)addr);
+	else
+		*(volatile unsigned short __force *) addr = b;
+}
+static inline void writel(unsigned int b, volatile void __iomem *addr)
+{
+	if (PCI_SPACE(addr) && cris_iops)
+		cris_iops->write_mem(b, 4, (void*)addr);
+	else
+		*(volatile unsigned int __force *) addr = b;
+}
 #define __raw_writeb writeb
 #define __raw_writew writew
 #define __raw_writel writel
@@ -66,25 +125,25 @@ extern void iounmap(void *addr);
  * Again, CRIS does not require mem IO specific function.
  */
 
-#define eth_io_copy_and_sum(a,b,c,d)	eth_copy_and_sum((a),(void *)(b),(c),(d))
+#define eth_io_copy_and_sum(a,b,c,d)	eth_copy_and_sum((a),(void __force *)(b),(c),(d))
 
 /* The following is junk needed for the arch-independent code but which
  * we never use in the CRIS port
  */
 
 #define IO_SPACE_LIMIT 0xffff
-#define inb(x) (0)
+#define inb(port) (cris_iops ? cris_iops->read_io(port,NULL,1,1) : 0)
-#define inw(x) (0)
+#define inw(port) (cris_iops ? cris_iops->read_io(port,NULL,2,1) : 0)
-#define inl(x) (0)
+#define inl(port) (cris_iops ? cris_iops->read_io(port,NULL,4,1) : 0)
-#define outb(x,y)
+#define insb(port,addr,count) (cris_iops ? cris_iops->read_io(port,addr,1,count) : 0)
-#define outw(x,y)
+#define insw(port,addr,count) (cris_iops ? cris_iops->read_io(port,addr,2,count) : 0)
-#define outl(x,y)
+#define insl(port,addr,count) (cris_iops ? cris_iops->read_io(port,addr,4,count) : 0)
-#define insb(x,y,z)
+#define outb(data,port) if (cris_iops) cris_iops->write_io(port,(void*)(unsigned)data,1,1)
-#define insw(x,y,z)
+#define outw(data,port) if (cris_iops) cris_iops->write_io(port,(void*)(unsigned)data,2,1)
-#define insl(x,y,z)
+#define outl(data,port) if (cris_iops) cris_iops->write_io(port,(void*)(unsigned)data,4,1)
-#define outsb(x,y,z)
+#define outsb(port,addr,count) if(cris_iops) cris_iops->write_io(port,(void*)addr,1,count)
-#define outsw(x,y,z)
+#define outsw(port,addr,count) if(cris_iops) cris_iops->write_io(port,(void*)addr,2,count)
-#define outsl(x,y,z)
+#define outsl(port,addr,count) if(cris_iops) cris_iops->write_io(port,(void*)addr,3,count)
 
 /*
  * Convert a physical pointer to a virtual kernel pointer for /dev/mem

include/asm-cris/pci.h

@@ -1,13 +1,105 @@
 #ifndef __ASM_CRIS_PCI_H
 #define __ASM_CRIS_PCI_H
 
+#include <linux/config.h>
+
+#ifdef __KERNEL__
+#include <linux/mm.h>		/* for struct page */
+
+/* Can be used to override the logic in pci_scan_bus for skipping
+   already-configured bus numbers - to be used for buggy BIOSes
+   or architectures with incomplete PCI setup by the loader */
+
+#define pcibios_assign_all_busses(void) 1
+
+extern unsigned long pci_mem_start;
+#define PCIBIOS_MIN_IO		0x1000
+#define PCIBIOS_MIN_MEM		0x10000000
+
+#define PCIBIOS_MIN_CARDBUS_IO	0x4000
+
+void pcibios_config_init(void);
+struct pci_bus * pcibios_scan_root(int bus);
+int pcibios_assign_resources(void);
+
+void pcibios_set_master(struct pci_dev *dev);
+void pcibios_penalize_isa_irq(int irq);
+struct irq_routing_table *pcibios_get_irq_routing_table(void);
+int pcibios_set_irq_routing(struct pci_dev *dev, int pin, int irq);
+
+/* Dynamic DMA mapping stuff.
+ * i386 has everything mapped statically.
+ */
+
+#include <linux/types.h>
+#include <linux/slab.h>
 #include <asm/scatterlist.h>
+#include <linux/string.h>
+#include <asm/io.h>
+
+struct pci_dev;
+
+/* The PCI address space does equal the physical memory
+ * address space.  The networking and block device layers use
+ * this boolean for bounce buffer decisions.
+ */
+#define PCI_DMA_BUS_IS_PHYS	(1)
+
+/* pci_unmap_{page,single} is a nop so... */
+#define DECLARE_PCI_UNMAP_ADDR(ADDR_NAME)
+#define DECLARE_PCI_UNMAP_LEN(LEN_NAME)
+#define pci_unmap_addr(PTR, ADDR_NAME)		(0)
+#define pci_unmap_addr_set(PTR, ADDR_NAME, VAL)	do { } while (0)
+#define pci_unmap_len(PTR, LEN_NAME)		(0)
+#define pci_unmap_len_set(PTR, LEN_NAME, VAL)	do { } while (0)
+
+/* This is always fine. */
+#define pci_dac_dma_supported(pci_dev, mask)	(1)
+
+static inline dma64_addr_t
+pci_dac_page_to_dma(struct pci_dev *pdev, struct page *page, unsigned long offset, int direction)
+{
+	return ((dma64_addr_t) page_to_phys(page) +
+		(dma64_addr_t) offset);
+}
+
+static inline struct page *
+pci_dac_dma_to_page(struct pci_dev *pdev, dma64_addr_t dma_addr)
+{
+	return pfn_to_page(dma_addr >> PAGE_SHIFT);
+}
+
+static inline unsigned long
+pci_dac_dma_to_offset(struct pci_dev *pdev, dma64_addr_t dma_addr)
+{
+	return (dma_addr & ~PAGE_MASK);
+}
+
+static inline void
+pci_dac_dma_sync_single_for_cpu(struct pci_dev *pdev, dma64_addr_t dma_addr, size_t len, int direction)
+{
+}
+
+static inline void
+pci_dac_dma_sync_single_for_device(struct pci_dev *pdev, dma64_addr_t dma_addr, size_t len, int direction)
+{
+}
+
+#define HAVE_PCI_MMAP
+extern int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
+			       enum pci_mmap_state mmap_state, int write_combine);
+
+
+static inline void pcibios_add_platform_entries(struct pci_dev *dev)
+{
+}
+
+#endif /* __KERNEL__ */
+
+/* implement the pci_ DMA API in terms of the generic device dma_ one */
 #include <asm-generic/pci-dma-compat.h>
 
-/* ETRAX chips don't have a PCI bus. This file is just here because some stupid .c code
+/* generic pci stuff */
- * includes it even if CONFIG_PCI is not set.
+#include <asm-generic/pci.h>
- */
-#define PCI_DMA_BUS_IS_PHYS       (1)
 
 #endif /* __ASM_CRIS_PCI_H */
-