blackfin architecture

This adds support for the Analog Devices Blackfin processor architecture, and
currently supports the BF533, BF532, BF531, BF537, BF536, BF534, and BF561
(Dual Core) devices, with a variety of development platforms including those
avaliable from Analog Devices (BF533-EZKit, BF533-STAMP, BF537-STAMP,
BF561-EZKIT), and Bluetechnix!  Tinyboards.

The Blackfin architecture was jointly developed by Intel and Analog Devices
Inc.  (ADI) as the Micro Signal Architecture (MSA) core and introduced it in
December of 2000.  Since then ADI has put this core into its Blackfin
processor family of devices.  The Blackfin core has the advantages of a clean,
orthogonal,RISC-like microprocessor instruction set.  It combines a dual-MAC
(Multiply/Accumulate), state-of-the-art signal processing engine and
single-instruction, multiple-data (SIMD) multimedia capabilities into a single
instruction-set architecture.

The Blackfin architecture, including the instruction set, is described by the
ADSP-BF53x/BF56x Blackfin Processor Programming Reference
http://blackfin.uclinux.org/gf/download/frsrelease/29/2549/Blackfin_PRM.pdf

The Blackfin processor is already supported by major releases of gcc, and
there are binary and source rpms/tarballs for many architectures at:
http://blackfin.uclinux.org/gf/project/toolchain/frs There is complete
documentation, including "getting started" guides available at:
http://docs.blackfin.uclinux.org/ which provides links to the sources and
patches you will need in order to set up a cross-compiling environment for
bfin-linux-uclibc

This patch, as well as the other patches (toolchain, distribution,
uClibc) are actively supported by Analog Devices Inc, at:
http://blackfin.uclinux.org/

We have tested this on LTP, and our test plan (including pass/fails) can
be found at:
http://docs.blackfin.uclinux.org/doku.php?id=testing_the_linux_kernel

[m.kozlowski@tuxland.pl: balance parenthesis in blackfin header files]
Signed-off-by: Bryan Wu <bryan.wu@analog.com>
Signed-off-by: Mariusz Kozlowski <m.kozlowski@tuxland.pl>
Signed-off-by: Aubrey Li <aubrey.li@analog.com>
Signed-off-by: Jie Zhang <jie.zhang@analog.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 148 insertions, 0 deletions

diff --git a/include/asm-blackfin/pci.h b/include/asm-blackfin/pci.h
new file mode 100644
index 000000000000..61277358c865
--- /dev/null
+++ b/include/asm-blackfin/pci.h
@@ -0,0 +1,148 @@
+/* Changed from asm-m68k version, Lineo Inc.    May 2001        */
+
+#ifndef _ASM_BFIN_PCI_H
+#define _ASM_BFIN_PCI_H
+
+#include <asm/scatterlist.h>
+
+/*
+ *
+ * Written by Wout Klaren.
+ */
+
+/* Added by Chang Junxiao */
+#define PCIBIOS_MIN_IO 0x00001000
+#define PCIBIOS_MIN_MEM 0x10000000
+
+#define PCI_DMA_BUS_IS_PHYS       (1)
+struct pci_ops;
+
+/*
+ * Structure with hardware dependent information and functions of the
+ * PCI bus.
+ */
+struct pci_bus_info {
+
+        /*
+         * Resources of the PCI bus.
+         */
+        struct resource mem_space;
+        struct resource io_space;
+
+        /*
+         * System dependent functions.
+         */
+        struct pci_ops *bfin_pci_ops;
+        void (*fixup) (int pci_modify);
+        void (*conf_device) (unsigned char bus, unsigned char device_fn);
+};
+
+#define pcibios_assign_all_busses()     0
+static inline void pcibios_set_master(struct pci_dev *dev)
+{
+
+        /* No special bus mastering setup handling */
+}
+static inline void pcibios_penalize_isa_irq(int irq)
+{
+
+        /* We don't do dynamic PCI IRQ allocation */
+}
+static inline dma_addr_t pci_map_single(struct pci_dev *hwdev, void *ptr,
+                                        size_t size, int direction)
+{
+        if (direction == PCI_DMA_NONE)
+                BUG();
+
+         /* return virt_to_bus(ptr); */
+        return (dma_addr_t) ptr;
+}
+
+/* Unmap a single streaming mode DMA translation.  The dma_addr and size
+ * must match what was provided for in a previous pci_map_single call.  All
+ * other usages are undefined.
+ *
+ * After this call, reads by the cpu to the buffer are guarenteed to see
+ * whatever the device wrote there.
+ */
+static inline void pci_unmap_single(struct pci_dev *hwdev, dma_addr_t dma_addr,
+                                    size_t size, int direction)
+{
+        if (direction == PCI_DMA_NONE)
+                BUG();
+
+        /* Nothing to do */
+}
+
+/* Map a set of buffers described by scatterlist in streaming
+ * mode for DMA.  This is the scather-gather version of the
+ * above pci_map_single interface.  Here the scatter gather list
+ * elements are each tagged with the appropriate dma address
+ * and length.  They are obtained via sg_dma_{address,length}(SG).
+ *
+ * NOTE: An implementation may be able to use a smaller number of
+ *       DMA address/length pairs than there are SG table elements.
+ *       (for example via virtual mapping capabilities)
+ *       The routine returns the number of addr/length pairs actually
+ *       used, at most nents.
+ *
+ * Device ownership issues as mentioned above for pci_map_single are
+ * the same here.
+ */
+static inline int pci_map_sg(struct pci_dev *hwdev, struct scatterlist *sg,
+                             int nents, int direction)
+{
+        if (direction == PCI_DMA_NONE)
+                BUG();
+        return nents;
+}
+
+/* Unmap a set of streaming mode DMA translations.
+ * Again, cpu read rules concerning calls here are the same as for
+ * pci_unmap_single() above.
+ */
+static inline void pci_unmap_sg(struct pci_dev *hwdev, struct scatterlist *sg,
+                                int nents, int direction)
+{
+        if (direction == PCI_DMA_NONE)
+                BUG();
+
+        /* Nothing to do */
+}
+
+/* Make physical memory consistent for a single
+ * streaming mode DMA translation after a transfer.
+ *
+ * If you perform a pci_map_single() but wish to interrogate the
+ * buffer using the cpu, yet do not wish to teardown the PCI dma
+ * mapping, you must call this function before doing so.  At the
+ * next point you give the PCI dma address back to the card, the
+ * device again owns the buffer.
+ */
+static inline void pci_dma_sync_single(struct pci_dev *hwdev,
+                                       dma_addr_t dma_handle, size_t size,
+                                       int direction)
+{
+        if (direction == PCI_DMA_NONE)
+                BUG();
+
+        /* Nothing to do */
+}
+
+/* Make physical memory consistent for a set of streaming
+ * mode DMA translations after a transfer.
+ *
+ * The same as pci_dma_sync_single but for a scatter-gather list,
+ * same rules and usage.
+ */
+static inline void pci_dma_sync_sg(struct pci_dev *hwdev,
+                                   struct scatterlist *sg, int nelems,
+                                   int direction)
+{
+        if (direction == PCI_DMA_NONE)
+                BUG();
+
+        /* Nothing to do */
+}
+
+#endif                          /* _ASM_BFIN_PCI_H */