[ARM] 4348/4: iop3xx: Give Linux control over PCI initialization

Currently the iop3xx platform support code assumes that RedBoot is the
bootloader and has already initialized the ATU.  Linux should handle this
initialization for three reasons:

1/ The memory map that RedBoot sets up is not optimal (page_to_dma and
virt_to_phys return different addresses).  The effect of this is that using
the dma mapping API for the internal bus dma units generates pci bus
addresses that are incorrect for the internal bus.

2/ Not all iop platforms use RedBoot

3/ If the ATU is already initialized it indicates that the iop is an add-in
card in another host, it does not own the PCI bus, and should not be
re-initialized.

Changelog:
* rather than change nr_controllers to zero, simply do not call
  pci_common_init

Cc: Lennert Buytenhek <kernel@wantstofly.org>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

5 files changed, 41 insertions, 8 deletions

diff --git a/include/asm-arm/arch-iop32x/iop32x.h b/include/asm-arm/arch-iop32x/iop32x.h
index 2e9469047eb1..0d8af57221a1 100644
--- a/include/asm-arm/arch-iop32x/iop32x.h
+++ b/include/asm-arm/arch-iop32x/iop32x.h
@@ -24,5 +24,14 @@
 
 #include <asm/hardware/iop3xx.h>
 
+/* ATU Parameters
+ * set up a 1:1 bus to physical ram relationship
+ * w/ physical ram on top of pci in the memory map
+ */
+#define IOP32X_MAX_RAM_SIZE            0x40000000UL
+#define IOP3XX_MAX_RAM_SIZE            IOP32X_MAX_RAM_SIZE
+#define IOP3XX_PCI_LOWER_MEM_BA        0x80000000
+#define IOP32X_PCI_MEM_WINDOW_SIZE     0x04000000
+#define IOP3XX_PCI_MEM_WINDOW_SIZE     IOP32X_PCI_MEM_WINDOW_SIZE
 
 #endif
diff --git a/include/asm-arm/arch-iop32x/memory.h b/include/asm-arm/arch-iop32x/memory.h
index 764cd3f0d416..c51072af214e 100644
--- a/include/asm-arm/arch-iop32x/memory.h
+++ b/include/asm-arm/arch-iop32x/memory.h
@@ -19,8 +19,8 @@
  * bus_to_virt: Used to convert an address for DMA operations
  *              to an address that the kernel can use.
  */
-#define __virt_to_bus(x)        (((__virt_to_phys(x)) & ~(*IOP3XX_IATVR2)) | ((*IOP3XX_IABAR2) & 0xfffffff0))
-#define __bus_to_virt(x)        (__phys_to_virt(((x) & ~(*IOP3XX_IALR2)) | ( *IOP3XX_IATVR2)))
+#define __virt_to_bus(x)        (__virt_to_phys(x))
+#define __bus_to_virt(x)        (__phys_to_virt(x))
 
 
 #endif
diff --git a/include/asm-arm/arch-iop33x/iop33x.h b/include/asm-arm/arch-iop33x/iop33x.h
index 7ac6e93db5ff..766985b9a723 100644
--- a/include/asm-arm/arch-iop33x/iop33x.h
+++ b/include/asm-arm/arch-iop33x/iop33x.h
@@ -29,5 +29,15 @@
 #define IOP33X_UART1_PHYS       (IOP3XX_PERIPHERAL_PHYS_BASE + 0x1740)
 #define IOP33X_UART1_VIRT       (IOP3XX_PERIPHERAL_VIRT_BASE + 0x1740)
 
+/* ATU Parameters
+ * set up a 1:1 bus to physical ram relationship
+ * w/ pci on top of physical ram in memory map
+ */
+#define IOP33X_MAX_RAM_SIZE             0x80000000UL
+#define IOP3XX_MAX_RAM_SIZE             IOP33X_MAX_RAM_SIZE
+#define IOP3XX_PCI_LOWER_MEM_BA (PHYS_OFFSET + IOP33X_MAX_RAM_SIZE)
+#define IOP33X_PCI_MEM_WINDOW_SIZE      0x08000000
+#define IOP3XX_PCI_MEM_WINDOW_SIZE      IOP33X_PCI_MEM_WINDOW_SIZE
+
 
 #endif
diff --git a/include/asm-arm/arch-iop33x/memory.h b/include/asm-arm/arch-iop33x/memory.h
index 0d39139b241e..c8749127d6ab 100644
--- a/include/asm-arm/arch-iop33x/memory.h
+++ b/include/asm-arm/arch-iop33x/memory.h
@@ -19,8 +19,8 @@
  * bus_to_virt: Used to convert an address for DMA operations
  *              to an address that the kernel can use.
  */
-#define __virt_to_bus(x)        (((__virt_to_phys(x)) & ~(*IOP3XX_IATVR2)) | ((*IOP3XX_IABAR2) & 0xfffffff0))
-#define __bus_to_virt(x)        (__phys_to_virt(((x) & ~(*IOP3XX_IALR2)) | ( *IOP3XX_IATVR2)))
+#define __virt_to_bus(x)        (__virt_to_phys(x))
+#define __bus_to_virt(x)        (__phys_to_virt(x))
 
 
 #endif
diff --git a/include/asm-arm/hardware/iop3xx.h b/include/asm-arm/hardware/iop3xx.h
index 15141a9caca8..ebbcd9be3fe5 100644
--- a/include/asm-arm/hardware/iop3xx.h
+++ b/include/asm-arm/hardware/iop3xx.h
@@ -28,6 +28,7 @@
 extern void gpio_line_config(int line, int direction);
 extern int  gpio_line_get(int line);
 extern void gpio_line_set(int line, int value);
+extern int init_atu;
 #endif
 
 
@@ -103,6 +104,21 @@ extern void gpio_line_set(int line, int value);
 #define IOP3XX_PCIXCMD          (volatile u16 *)IOP3XX_REG_ADDR(0x01e2)
 #define IOP3XX_PCIXSR           (volatile u32 *)IOP3XX_REG_ADDR(0x01e4)
 #define IOP3XX_PCIIRSR          (volatile u32 *)IOP3XX_REG_ADDR(0x01ec)
+#define IOP3XX_PCSR_OUT_Q_BUSY (1 << 15)
+#define IOP3XX_PCSR_IN_Q_BUSY   (1 << 14)
+#define IOP3XX_ATUCR_OUT_EN     (1 << 1)
+
+#define IOP3XX_INIT_ATU_DEFAULT 0
+#define IOP3XX_INIT_ATU_DISABLE -1
+#define IOP3XX_INIT_ATU_ENABLE   1
+
+#ifdef CONFIG_IOP3XX_ATU
+#define iop3xx_get_init_atu(x) (init_atu == IOP3XX_INIT_ATU_DEFAULT ?\
+                                IOP3XX_INIT_ATU_ENABLE : init_atu)
+#else
+#define iop3xx_get_init_atu(x) (init_atu == IOP3XX_INIT_ATU_DEFAULT ?\
+                                IOP3XX_INIT_ATU_DISABLE : init_atu)
+#endif
 
 /* Messaging Unit  */
 #define IOP3XX_IMR0             (volatile u32 *)IOP3XX_REG_ADDR(0x0310)
@@ -253,14 +269,12 @@ extern void gpio_line_set(int line, int value);
 /*
  * IOP3XX I/O and Mem space regions for PCI autoconfiguration
  */
-#define IOP3XX_PCI_MEM_WINDOW_SIZE      0x04000000
-#define IOP3XX_PCI_LOWER_MEM_PA         0x80000000
-#define IOP3XX_PCI_LOWER_MEM_BA         (*IOP3XX_OMWTVR0)
+#define IOP3XX_PCI_LOWER_MEM_PA 0x80000000
 
 #define IOP3XX_PCI_IO_WINDOW_SIZE       0x00010000
 #define IOP3XX_PCI_LOWER_IO_PA          0x90000000
 #define IOP3XX_PCI_LOWER_IO_VA          0xfe000000
-#define IOP3XX_PCI_LOWER_IO_BA          (*IOP3XX_OIOWTVR)
+#define IOP3XX_PCI_LOWER_IO_BA          0x90000000
 #define IOP3XX_PCI_UPPER_IO_PA          (IOP3XX_PCI_LOWER_IO_PA +\
                                         IOP3XX_PCI_IO_WINDOW_SIZE - 1)
 #define IOP3XX_PCI_UPPER_IO_VA          (IOP3XX_PCI_LOWER_IO_VA +\