tegra: add PCI Express support

Change-Id: Ibd0bcd46895eb88952b9db29e1f68572d39aae01
Signed-off-by: Mike Rapoport <mike@compulab.co.il>
Acked-by: Arnd Bergmann <arnd@arndb.de>
CC: Russell King <linux@arm.linux.org.uk>
CC: Gary King <GKing@nvidia.com>
Signed-off-by: Colin Cross <ccross@android.com>

6 files changed, 936 insertions, 1 deletions

diff --git a/arch/arm/mach-tegra/Kconfig b/arch/arm/mach-tegra/Kconfig
index 8e32d9d7ec8d..acd9552f8ada 100644
--- a/arch/arm/mach-tegra/Kconfig
+++ b/arch/arm/mach-tegra/Kconfig
@@ -16,6 +16,10 @@ config ARCH_TEGRA_2x_SOC
 
 endchoice
 
+config TEGRA_PCI
+        bool "PCI Express support"
+        select PCI
+
 comment "Tegra board type"
 
 config MACH_HARMONY
diff --git a/arch/arm/mach-tegra/Makefile b/arch/arm/mach-tegra/Makefile
index fc069a9e0f6b..b4c07e67a1fb 100644
--- a/arch/arm/mach-tegra/Makefile
+++ b/arch/arm/mach-tegra/Makefile
@@ -14,6 +14,7 @@ obj-$(CONFIG_SMP)                       += platsmp.o localtimer.o headsmp.o
 obj-$(CONFIG_HOTPLUG_CPU)               += hotplug.o
 obj-$(CONFIG_TEGRA_SYSTEM_DMA)          += dma.o
 obj-$(CONFIG_CPU_FREQ)                  += cpu-tegra.o
+obj-$(CONFIG_TEGRA_PCI)                 += pcie.o
 
 obj-${CONFIG_MACH_HARMONY}              += board-harmony.o
 obj-${CONFIG_MACH_HARMONY}              += board-harmony-pinmux.o
diff --git a/arch/arm/mach-tegra/board.h b/arch/arm/mach-tegra/board.h
index 3d06354136f2..0de565ca37c5 100644
--- a/arch/arm/mach-tegra/board.h
+++ b/arch/arm/mach-tegra/board.h
@@ -27,6 +27,7 @@ void __init tegra_common_init(void);
 void __init tegra_map_common_io(void);
 void __init tegra_init_irq(void);
 void __init tegra_init_clock(void);
+int __init tegra_pcie_init(bool init_port0, bool init_port1);
 
 extern struct sys_timer tegra_timer;
 #endif
diff --git a/arch/arm/mach-tegra/include/mach/hardware.h b/arch/arm/mach-tegra/include/mach/hardware.h
index 6014edf60d93..56e43b3a5b97 100644
--- a/arch/arm/mach-tegra/include/mach/hardware.h
+++ b/arch/arm/mach-tegra/include/mach/hardware.h
@@ -21,4 +21,8 @@
 #ifndef __MACH_TEGRA_HARDWARE_H
 #define __MACH_TEGRA_HARDWARE_H
 
+#define PCIBIOS_MIN_IO                  0x1000
+#define PCIBIOS_MIN_MEM                 0
+#define pcibios_assign_all_busses()     1
+
 #endif
diff --git a/arch/arm/mach-tegra/include/mach/io.h b/arch/arm/mach-tegra/include/mach/io.h
index 16f16189b5eb..f0981b1ac59e 100644
--- a/arch/arm/mach-tegra/include/mach/io.h
+++ b/arch/arm/mach-tegra/include/mach/io.h
@@ -21,7 +21,7 @@
 #ifndef __MACH_TEGRA_IO_H
 #define __MACH_TEGRA_IO_H
 
-#define IO_SPACE_LIMIT 0xffffffff
+#define IO_SPACE_LIMIT 0xffff
 
 /* On TEGRA, many peripherals are very closely packed in
  * two 256MB io windows (that actually only use about 64KB
@@ -73,10 +73,20 @@ void tegra_iounmap(volatile void __iomem *addr);
 
 #define IO_ADDRESS(n) ((void __iomem *) IO_TO_VIRT(n))
 
+#ifdef CONFIG_TEGRA_PCI
+extern void __iomem *tegra_pcie_io_base;
+
+static inline void __iomem *__io(unsigned long addr)
+{
+        return tegra_pcie_io_base + (addr & IO_SPACE_LIMIT);
+}
+#else
 static inline void __iomem *__io(unsigned long addr)
 {
         return (void __iomem *)addr;
 }
+#endif
+
 #define __io(a)         __io(a)
 #define __mem_pci(a)    (a)
 
diff --git a/arch/arm/mach-tegra/pcie.c b/arch/arm/mach-tegra/pcie.c
new file mode 100644
index 000000000000..53f5fa37014a
--- /dev/null
+++ b/arch/arm/mach-tegra/pcie.c
@@ -0,0 +1,915 @@
+/*
+ * arch/arm/mach-tegra/pci.c
+ *
+ * PCIe host controller driver for TEGRA(2) SOCs
+ *
+ * Copyright (c) 2010, CompuLab, Ltd.
+ * Author: Mike Rapoport <mike@compulab.co.il>
+ *
+ * Based on NVIDIA PCIe driver
+ * Copyright (c) 2008-2009, NVIDIA Corporation.
+ *
+ * Bits taken from arch/arm/mach-dove/pcie.c
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+
+#include <linux/kernel.h>
+#include <linux/pci.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/clk.h>
+#include <linux/delay.h>
+
+#include <asm/sizes.h>
+#include <asm/mach/pci.h>
+
+#include <mach/pinmux.h>
+#include <mach/iomap.h>
+#include <mach/clk.h>
+
+/* register definitions */
+#define AFI_OFFSET      0x3800
+#define PADS_OFFSET     0x3000
+#define RP0_OFFSET      0x0000
+#define RP1_OFFSET      0x1000
+
+#define AFI_AXI_BAR0_SZ 0x00
+#define AFI_AXI_BAR1_SZ 0x04
+#define AFI_AXI_BAR2_SZ 0x08
+#define AFI_AXI_BAR3_SZ 0x0c
+#define AFI_AXI_BAR4_SZ 0x10
+#define AFI_AXI_BAR5_SZ 0x14
+
+#define AFI_AXI_BAR0_START      0x18
+#define AFI_AXI_BAR1_START      0x1c
+#define AFI_AXI_BAR2_START      0x20
+#define AFI_AXI_BAR3_START      0x24
+#define AFI_AXI_BAR4_START      0x28
+#define AFI_AXI_BAR5_START      0x2c
+
+#define AFI_FPCI_BAR0   0x30
+#define AFI_FPCI_BAR1   0x34
+#define AFI_FPCI_BAR2   0x38
+#define AFI_FPCI_BAR3   0x3c
+#define AFI_FPCI_BAR4   0x40
+#define AFI_FPCI_BAR5   0x44
+
+#define AFI_CACHE_BAR0_SZ       0x48
+#define AFI_CACHE_BAR0_ST       0x4c
+#define AFI_CACHE_BAR1_SZ       0x50
+#define AFI_CACHE_BAR1_ST       0x54
+
+#define AFI_MSI_BAR_SZ          0x60
+#define AFI_MSI_FPCI_BAR_ST     0x64
+#define AFI_MSI_AXI_BAR_ST      0x68
+
+#define AFI_CONFIGURATION               0xac
+#define  AFI_CONFIGURATION_EN_FPCI      (1 << 0)
+
+#define AFI_FPCI_ERROR_MASKS    0xb0
+
+#define AFI_INTR_MASK           0xb4
+#define  AFI_INTR_MASK_INT_MASK (1 << 0)
+#define  AFI_INTR_MASK_MSI_MASK (1 << 8)
+
+#define AFI_INTR_CODE           0xb8
+#define  AFI_INTR_CODE_MASK     0xf
+#define  AFI_INTR_MASTER_ABORT  4
+#define  AFI_INTR_LEGACY        6
+
+#define AFI_INTR_SIGNATURE      0xbc
+#define AFI_SM_INTR_ENABLE      0xc4
+
+#define AFI_AFI_INTR_ENABLE             0xc8
+#define  AFI_