powerpc: Add PCI support for 8540 ADS to powerpc tree

Add PCI support for setting PCI from flat device tree on 85xx specifically for
MPC8540 ADS.

Signed-off-by: Andy Fleming <afleming@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

5 files changed, 166 insertions, 25 deletions

diff --git a/arch/powerpc/platforms/85xx/Makefile b/arch/powerpc/platforms/85xx/Makefile
index 70e1190809f8..ffc4139cb214 100644
--- a/arch/powerpc/platforms/85xx/Makefile
+++ b/arch/powerpc/platforms/85xx/Makefile
@@ -1,4 +1,5 @@
 #
 # Makefile for the PowerPC 85xx linux kernel.
 #
-obj-$(CONFIG_PPC_85xx)  += misc.o mpc85xx_ads.o
+obj-$(CONFIG_PPC_85xx)  += misc.o pci.o
+obj-$(CONFIG_MPC8540_ADS) += mpc85xx_ads.o
diff --git a/arch/powerpc/platforms/85xx/mpc8540_ads.h b/arch/powerpc/platforms/85xx/mpc8540_ads.h
index b3ec88caad11..f770cadb2080 100644
--- a/arch/powerpc/platforms/85xx/mpc8540_ads.h
+++ b/arch/powerpc/platforms/85xx/mpc8540_ads.h
@@ -30,30 +30,6 @@
 #define PIRQC           MPC85xx_IRQ_EXT3
 #define PIRQD           MPC85xx_IRQ_EXT4
 
-#define MPC85XX_PCI1_LOWER_IO   0x00000000
-#define MPC85XX_PCI1_UPPER_IO   0x00ffffff
-
-#define MPC85XX_PCI1_LOWER_MEM  0x80000000
-#define MPC85XX_PCI1_UPPER_MEM  0x9fffffff
-
-#define MPC85XX_PCI1_IO_BASE    0xe2000000
-#define MPC85XX_PCI1_MEM_OFFSET 0x00000000
-
-#define MPC85XX_PCI1_IO_SIZE    0x01000000
-
-/* PCI config */
-#define PCI1_CFG_ADDR_OFFSET    (0x8000)
-#define PCI1_CFG_DATA_OFFSET    (0x8004)
-
-#define PCI2_CFG_ADDR_OFFSET    (0x9000)
-#define PCI2_CFG_DATA_OFFSET    (0x9004)
-
-/* Additional register for PCI-X configuration */
-#define PCIX_NEXT_CAP   0x60
-#define PCIX_CAP_ID     0x61
-#define PCIX_COMMAND    0x62
-#define PCIX_STATUS     0x64
-
 /* Offset of CPM register space */
 #define CPM_MAP_ADDR    (CCSRBAR + MPC85xx_CPM_OFFSET)
 
diff --git a/arch/powerpc/platforms/85xx/mpc85xx.h b/arch/powerpc/platforms/85xx/mpc85xx.h
index be75abb2a283..b44db6268f3d 100644
--- a/arch/powerpc/platforms/85xx/mpc85xx.h
+++ b/arch/powerpc/platforms/85xx/mpc85xx.h
@@ -15,3 +15,4 @@
  */
 
 extern void mpc85xx_restart(char *);
+extern int add_bridge(struct device_node *dev);
diff --git a/arch/powerpc/platforms/85xx/mpc85xx_ads.c b/arch/powerpc/platforms/85xx/mpc85xx_ads.c
index ba6798d47654..b7821dbae00d 100644
--- a/arch/powerpc/platforms/85xx/mpc85xx_ads.c
+++ b/arch/powerpc/platforms/85xx/mpc85xx_ads.c
@@ -67,6 +67,62 @@ static u_char mpc85xx_ads_openpic_initsenses[] __initdata = {
         0x0,                    /* External 11: */
 };
 
+#ifdef CONFIG_PCI
+/*
+ * interrupt routing
+ */
+
+int
+mpc85xx_map_irq(struct pci_dev *dev, unsigned char idsel, unsigned char pin)
+{
+        static char pci_irq_table[][4] =
+            /*
+             * This is little evil, but works around the fact
+             * that revA boards have IDSEL starting at 18
+             * and others boards (older) start at 12
+             *
+             *      PCI IDSEL/INTPIN->INTLINE
+             *       A      B      C      D
+             */
+        {
+                {PIRQA, PIRQB, PIRQC, PIRQD},   /* IDSEL 2 */
+                {PIRQD, PIRQA, PIRQB, PIRQC},
+                {PIRQC, PIRQD, PIRQA, PIRQB},
+                {PIRQB, PIRQC, PIRQD, PIRQA},   /* IDSEL 5 */
+                {0, 0, 0, 0},   /* -- */
+                {0, 0, 0, 0},   /* -- */
+                {0, 0, 0, 0},   /* -- */
+                {0, 0, 0, 0},   /* -- */
+                {0, 0, 0, 0},   /* -- */
+                {0, 0, 0, 0},   /* -- */
+                {PIRQA, PIRQB, PIRQC, PIRQD},   /* IDSEL 12 */
+                {PIRQD, PIRQA, PIRQB, PIRQC},
+                {PIRQC, PIRQD, PIRQA, PIRQB},
+                {PIRQB, PIRQC, PIRQD, PIRQA},   /* IDSEL 15 */
+                {0, 0, 0, 0},   /* -- */
+                {0, 0, 0, 0},   /* -- */
+                {PIRQA, PIRQB, PIRQC, PIRQD},   /* IDSEL 18 */
+                {PIRQD, PIRQA, PIRQB, PIRQC},
+                {PIRQC, PIRQD, PIRQA, PIRQB},
+                {PIRQB, PIRQC, PIRQD, PIRQA},   /* IDSEL 21 */
+        };
+
+        const long min_idsel = 2, max_idsel = 21, irqs_per_slot = 4;
+        return PCI_IRQ_TABLE_LOOKUP;
+}
+
+int
+mpc85xx_exclude_device(u_char bus, u_char devfn)
+{
+        if (bus == 0 && PCI_SLOT(devfn) == 0)
+                return PCIBIOS_DEVICE_NOT_FOUND;
+        else
+                return PCIBIOS_SUCCESSFUL;
+}
+
+#endif /* CONFIG_PCI */
+
+
 void __init mpc85xx_ads_pic_init(void)
 {
         struct mpic *mpic1;
@@ -110,6 +166,7 @@ void __init mpc85xx_ads_pic_init(void)
 static void __init mpc85xx_ads_setup_arch(void)
 {
         struct device_node *cpu;
+        struct device_node *np;
 
         if (ppc_md.progress)
                 ppc_md.progress("mpc85xx_ads_setup_arch()", 0);
@@ -125,6 +182,16 @@ static void __init mpc85xx_ads_setup_arch(void)
                         loops_per_jiffy = 50000000 / HZ;
                 of_node_put(cpu);
         }
+
+#ifdef CONFIG_PCI
+        for (np = NULL; (np = of_find_node_by_type(np, "pci")) != NULL;)
+                add_bridge(np);
+
+        ppc_md.pci_swizzle = common_swizzle;
+        ppc_md.pci_map_irq = mpc85xx_map_irq;
+        ppc_md.pci_exclude_device = mpc85xx_exclude_device;
+#endif
+
 #ifdef  CONFIG_ROOT_NFS
         ROOT_DEV = Root_NFS;
 #else
diff --git a/arch/powerpc/platforms/85xx/pci.c b/arch/powerpc/platforms/85xx/pci.c
new file mode 100644
index 000000000000..bad290110ed1
--- /dev/null
+++ b/arch/powerpc/platforms/85xx/pci.c
@@ -0,0 +1,96 @@
+/*
+ * FSL SoC setup code
+ *
+ * Maintained by Kumar Gala (see MAINTAINERS for contact information)
+ *
+ * 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.
+ */
+
+#include <linux/config.h>
+#include <linux/stddef.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/errno.h>
+#include <linux/pci.h>
+#include <linux/delay.h>
+#include <linux/irq.h>
+#include <linux/module.h>
+
+#include <asm/system.h>
+#include <asm/atomic.h>
+#include <asm/io.h>
+#include <asm/pci-bridge.h>
+#include <asm/prom.h>
+#include <sysdev/fsl_soc.h>
+
+#undef DEBUG
+
+#ifdef DEBUG
+#define DBG(x...) printk(x)
+#else
+#define DBG(x...)
+#endif
+
+int mpc85xx_pci2_busno = 0;
+
+#ifdef CONFIG_PCI
+int __init add_bridge(struct device_node *dev)
+{
+        int len;
+        struct pci_controller *hose;
+        struct resource rsrc;
+        int *bus_range;
+        int primary = 1, has_address = 0;
+        phys_addr_t immr = get_immrbase();
+
+        DBG("Adding PCI host bridge %s\n", dev->full_name);
+
+        /* Fetch host bridge registers address */
+        has_address = (of_address_to_resource(dev, 0, &rsrc) == 0);
+
+        /* Get bus range if any */
+        bus_range = (int *) get_property(dev, "bus-range", &len);
+        if (bus_range == NULL || len < 2 * sizeof(int)) {
+                printk(KERN_WARNING "Can't get bus-range for %s, assume"
+                       " bus 0\n", dev->full_name);
+        }
+
+        hose = pcibios_alloc_controller();
+        if (!hose)
+                return -ENOMEM;
+        hose->arch_data = dev;
+        hose->set_cfg_type = 1;
+
+        hose->first_busno = bus_range ? bus_range[0] : 0;
+        hose->last_busno = bus_range ? bus_range[1] : 0xff;
+
+        /* PCI 1 */
+        if ((rsrc.start & 0xfffff) == 0x8000) {
+                setup_indirect_pci(hose, immr + 0x8000, immr + 0x8004);
+        }
+        /* PCI 2 */
+        if ((rsrc.start & 0xfffff) == 0x9000) {
+                setup_indirect_pci(hose, immr + 0x9000, immr + 0x9004);
+                primary = 0;
+                hose->bus_offset = hose->first_busno;
+                mpc85xx_pci2_busno = hose->first_busno;
+        }
+
+        printk(KERN_INFO "Found MPC85xx PCI host bridge at 0x%08lx. "
+               "Firmware bus number: %d->%d\n",
+                rsrc.start, hose->first_busno, hose->last_busno);
+
+        DBG(" ->Hose at 0x%p, cfg_addr=0x%p,cfg_data=0x%p\n",
+                hose, hose->cfg_addr, hose->cfg_data);
+
+        /* Interpret the "ranges" property */
+        /* This also maps the I/O region and sets isa_io/mem_base */
+        pci_process_bridge_OF_ranges(hose, dev, primary);
+
+        return 0;
+}
+
+#endif