[PATCH] ppc64: Split out generic rtas code from pSeries_pci.c.

BPA is using rtas for PCI but should not be confused by
pSeries code. This also avoids some #ifdefs. Other
platforms that want to use rtas_pci.c could create
their own platform_pci.c with platform specific fixups.

Signed-off-by: Arnd Bergmann <arndb@de.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 495 insertions, 0 deletions

diff --git a/arch/ppc64/kernel/rtas_pci.c b/arch/ppc64/kernel/rtas_pci.c
new file mode 100644
index 000000000000..1048817befb8
--- /dev/null
+++ b/arch/ppc64/kernel/rtas_pci.c
@@ -0,0 +1,495 @@
+/*
+ * arch/ppc64/kernel/rtas_pci.c
+ *
+ * Copyright (C) 2001 Dave Engebretsen, IBM Corporation
+ * Copyright (C) 2003 Anton Blanchard <anton@au.ibm.com>, IBM
+ *
+ * RTAS specific routines for PCI.
+ * 
+ * Based on code from pci.c, chrp_pci.c and pSeries_pci.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., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
+ */
+
+#include <linux/kernel.h>
+#include <linux/threads.h>
+#include <linux/pci.h>
+#include <linux/string.h>
+#include <linux/init.h>
+#include <linux/bootmem.h>
+
+#include <asm/io.h>
+#include <asm/pgtable.h>
+#include <asm/irq.h>
+#include <asm/prom.h>
+#include <asm/machdep.h>
+#include <asm/pci-bridge.h>
+#include <asm/iommu.h>
+#include <asm/rtas.h>
+
+#include "mpic.h"
+#include "pci.h"
+
+/* RTAS tokens */
+static int read_pci_config;
+static int write_pci_config;
+static int ibm_read_pci_config;
+static int ibm_write_pci_config;
+
+static int config_access_valid(struct device_node *dn, int where)
+{
+        if (where < 256)
+                return 1;
+        if (where < 4096 && dn->pci_ext_config_space)
+                return 1;
+
+        return 0;
+}
+
+static int rtas_read_config(struct device_node *dn, int where, int size, u32 *val)
+{
+        int returnval = -1;
+        unsigned long buid, addr;
+        int ret;
+
+        if (!dn)
+                return PCIBIOS_DEVICE_NOT_FOUND;
+        if (!config_access_valid(dn, where))
+                return PCIBIOS_BAD_REGISTER_NUMBER;
+
+        addr = ((where & 0xf00) << 20) | (dn->busno << 16) |
+                (dn->devfn << 8) | (where & 0xff);
+        buid = dn->phb->buid;
+        if (buid) {
+                ret = rtas_call(ibm_read_pci_config, 4, 2, &returnval,
+                                addr, buid >> 32, buid & 0xffffffff, size);
+        } else {
+                ret = rtas_call(read_pci_config, 2, 2, &returnval, addr, size);
+        }
+        *val = returnval;
+
+        if (ret)
+                return PCIBIOS_DEVICE_NOT_FOUND;
+
+        if (returnval == EEH_IO_ERROR_VALUE(size)
+            && eeh_dn_check_failure (dn, NULL))
+                return PCIBIOS_DEVICE_NOT_FOUND;
+
+        return PCIBIOS_SUCCESSFUL;
+}
+
+static int rtas_pci_read_config(struct pci_bus *bus,
+                                unsigned int devfn,
+                                int where, int size, u32 *val)
+{
+        struct device_node *busdn, *dn;
+
+        if (bus->self)
+                busdn = pci_device_to_OF_node(bus->self);
+        else
+                busdn = bus->sysdata;   /* must be a phb */
+
+        /* Search only direct children of the bus */
+        for (dn = busdn->child; dn; dn = dn->sibling)
+                if (dn->devfn == devfn)
+                        return rtas_read_config(dn, where, size, val);
+        return PCIBIOS_DEVICE_NOT_FOUND;
+}
+
+static int rtas_write_config(struct device_node *dn, int where, int size, u32 val)
+{
+        unsigned long buid, addr;
+        int ret;
+
+        if (!dn)
+                return PCIBIOS_DEVICE_NOT_FOUND;
+        if (!config_access_valid(dn, where))
+                return PCIBIOS_BAD_REGISTER_NUMBER;
+
+        addr = ((where & 0xf00) << 20) | (dn->busno << 16) |
+                (dn->devfn << 8) | (where & 0xff);
+        buid = dn->phb->buid;
+        if (buid) {
+                ret = rtas_call(ibm_write_pci_config, 5, 1, NULL, addr, buid >> 32, buid & 0xffffffff, size, (ulong) val);
+        } else {
+                ret = rtas_call(write_pci_config, 3, 1, NULL, addr, size, (ulong)val);
+        }
+
+        if (ret)
+                return PCIBIOS_DEVICE_NOT_FOUND;
+
+        return PCIBIOS_SUCCESSFUL;
+}
+
+static int rtas_pci_write_config(struct pci_bus *bus,
+                                 unsigned int devfn,
+                                 int where, int size, u32 val)
+{
+        struct device_node *busdn, *dn;
+
+        if (bus->self)
+                busdn = pci_device_to_OF_node(bus->self);
+        else
+                busdn = bus->sysdata;   /* must be a phb */
+
+        /* Search only direct children of the bus */
+        for (dn = busdn->child; dn; dn = dn->sibling)
+                if (dn->devfn == devfn)
+                        return rtas_write_config(dn, where, size, val);
+        return PCIBIOS_DEVICE_NOT_FOUND;
+}
+
+struct pci_ops rtas_pci_ops = {
+        rtas_pci_read_config,
+        rtas_pci_write_config
+};
+
+int is_python(struct device_node *dev)
+{
+        char *model = (char *)get_property(dev, "model", NULL);
+
+        if (model && strstr(model, "Python"))
+                return 1;
+
+        return 0;
+}
+
+static int get_phb_reg_prop(struct device_node *dev,
+                            unsigned int addr_size_words,
+                            struct reg_property64 *reg)
+{
+        unsigned int *ui_ptr = NULL, len;
+
+        /* Found a PHB, now figure out where his registers are mapped. */
+        ui_ptr = (unsigned int *)get_property(dev, "reg", &len);
+        if (ui_ptr == NULL)
+                return 1;
+
+        if (addr_size_words == 1) {
+                reg->address = ((struct reg_property32 *)ui_ptr)->address;
+                reg->size    = ((struct reg_property32 *)ui_ptr)->size;
+        } else {
+                *reg = *((struct reg_property64 *)ui_ptr);
+        }
+
+        return 0;
+}
+
+static void python_countermeasures(struct device_node *dev,
+                                   unsigned int addr_size_words)
+{
+        struct reg_property64 reg_struct;
+        void __iomem *chip_regs;
+        volatile u32 val;
+
+        if (get_phb_reg_prop(dev, addr_size_words, &reg_struct))
+                return;
+
+        /* Python's register file is 1 MB in size. */
+        chip_regs = ioremap(reg_struct.address & ~(0xfffffUL), 0x100000);
+
+        /* 
+         * Firmware doesn't always clear this bit which is critical
+         * for good performance - Anton
+         */
+
+#define PRG_CL_RESET_VALID 0x00010000
+
+        val = in_be32(chip_regs + 0xf6030);
+        if (val & PRG_CL_RESET_VALID) {
+                printk(KERN_INFO "Python workaround: ");
+                val &= ~PRG_CL_RESET_VALID;
+                out_be32(chip_regs + 0xf6030, val);
+                /*
+                 * We must read it back for changes to
+                 * take effect
+                 */
+                val = in_be32(chip_regs + 0xf6030);
+                printk("reg0: %x\n", val);
+        }
+
+        iounmap(chip_regs);
+}
+
+void __init init_pci_config_tokens (void)
+{
+        read_pci_config = rtas_token("read-pci-config");
+        write_pci_config = rtas_token("write-pci-config");
+        ibm_read_pci_config = rtas_token("ibm,read-pci-config");
+        ibm_write_pci_config = rtas_token("ibm,write-pci-config");
+}
+
+unsigned long __devinit get_phb_buid (struct device_node *phb)
+{
+        int addr_cells;
+        unsigned int *buid_vals;
+        unsigned int len;
+        unsigned long buid;
+
+        if (ibm_read_pci_config == -1) return 0;
+
+        /* PHB's will always be children of the root node,
+         * or so it is promised by the current firmware. */
+        if (phb->parent == NULL)
+                return 0;
+        if (phb->parent->parent)
+                return 0;
+
+        buid_vals = (unsigned int *) get_property(phb, "reg", &len);
+        if (buid_vals == NULL)
+                return 0;
+
+        addr_cells = prom_n_addr_cells(phb);
+        if (addr_cells == 1) {
+                buid = (unsigned long) buid_vals[0];
+        } else {
+                buid = (((unsigned long)buid_vals[0]) << 32UL) |
+                        (((unsigned long)buid_vals[1]) & 0xffffffff);
+        }
+        return buid;
+}
+
+static int phb_set_bus_ranges(struct device_node *dev,
+                              struct pci_controller *phb)
+{
+        int *bus_range;
+        unsigned int len;
+
+        bus_range = (int *) get_property(dev, "bus-range", &len);
+        if (bus_range == NULL || len < 2 * sizeof(int)) {
+                return 1;
+        }
+ 
+        phb->first_busno =  bus_range[0];
+        phb->last_busno  =  bus_range[1];
+
+        return 0;
+}
+
+static int __devinit setup_phb(struct device_node *dev,
+                               struct pci_controller *phb,
+                               unsigned int addr_size_words)
+{
+        pci_setup_pci_controller(phb);
+
+        if (is_python(dev))
+                python_countermeasures(dev, addr_size_words);
+
+        if (phb_set_bus_ranges(dev, phb))
+                return 1;
+
+        phb->arch_data = dev;
+        phb->ops = &rtas_pci_ops;
+        phb->buid = get_phb_buid(dev);
+
+        return 0;
+}
+
+static void __devinit add_linux_pci_domain(struct device_node *dev,
+                                           struct pci_controller *phb,
+                                           struct property *of_prop)
+{
+        memset(of_prop, 0, sizeof(struct property));
+        of_prop->name = "linux,pci-domain";
+        of_prop->length = sizeof(phb->global_number);
+        of_prop->value = (unsigned char *)&of_prop[1];
+        memcpy(of_prop->value, &phb->global_number, sizeof(phb->global_number));
+        prom_add_property(dev, of_prop);
+}
+
+static struct pci_controller * __init alloc_phb(struct device_node *dev,
+                                                unsigned int addr_size_words)
+{
+        struct pci_controller *phb;
+        struct property *of_prop;
+
+        phb = alloc_bootmem(sizeof(struct pci_controller));
+        if (phb == NULL)
+                return NULL;
+
+        of_prop = alloc_bootmem(sizeof(struct property) +
+                                sizeof(phb->global_number));
+        if (!of_prop)
+                return NULL;
+
+        if (setup_phb(dev, phb, addr_size_words))
+                return NULL;
+
+        add_linux_pci_domain(dev, phb, of_prop);
+
+        return phb;
+}
+
+static struct pci_controller * __devinit alloc_phb_dynamic(struct device_node *dev, unsigned int addr_size_words)
+{
+        struct pci_controller *phb;
+
+        phb = (struct pci_controller *)kmalloc(sizeof(struct pci_controller),
+                                               GFP_KERNEL);
+        if (phb == NULL)
+                return NULL;
+
+        if (setup_phb(dev, phb, addr_size_words))
+                return NULL;
+
+        phb->is_dynamic = 1;
+
+        /* TODO: linux,pci-domain? */
+
+        return phb;
+}
+
+unsigned long __init find_and_init_phbs(void)
+{
+        struct device_node *node;
+        struct pci_controller *phb;
+        unsigned int root_size_cells = 0;
+        unsigned int index;
+        unsigned int *opprop = NULL;
+        struct device_node *root = of_find_node_by_path("/");
+
+        if (ppc64_interrupt_controller == IC_OPEN_PIC) {
+                opprop = (unsigned int *)get_property(root,
+                                "platform-open-pic", NULL);
+        }
+
+        root_size_cells = prom_n_size_cells(root);
+
+        index = 0;
+
+        for (node = of_get_next_child(root, NULL);
+             node != NULL;
+             node = of_get_next_child(root, node)) {
+                if (node->type == NULL || strcmp(node->type, "pci") != 0)
+                        continue;
+
+                phb = alloc_phb(node, root_size_cells);
+                if (!phb)
+                        continue;
+
+                pci_process_bridge_OF_ranges(phb, node);
+                pci_setup_phb_io(phb, index == 0);
+#ifdef CONFIG_PPC_PSERIES
+                if (ppc64_interrupt_controller == IC_OPEN_PIC && pSeries_mpic) {
+                        int addr = root_size_cells * (index + 2) - 1;
+                        mpic_assign_isu(pSeries_mpic, index, opprop[addr]);
+                }
+#endif
+                index++;
+        }
+
+        of_node_put(root);
+        pci_devs_phb_init();
+
+        /*
+         * pci_probe_only and pci_assign_all_buses can be set via properties
+         * in chosen.
+         */
+        if (of_chosen) {
+                int *prop;
+
+                prop = (int *)get_property(of_chosen, "linux,pci-probe-only",
+                                           NULL);
+                if (prop)
+                        pci_probe_only = *prop;
+
+                prop = (int *)get_property(of_chosen,
+                                           "linux,pci-assign-all-buses", NULL);
+                if (prop)
+                        pci_assign_all_buses = *prop;
+        }
+
+        return 0;
+}
+
+struct pci_controller * __devinit init_phb_dynamic(struct device_node *dn)
+{
+        struct device_node *root = of_find_node_by_path("/");
+        unsigned int root_size_cells = 0;
+        struct pci_controller *phb;
+        struct pci_bus *bus;
+        int primary;
+
+        root_size_cells = prom_n_size_cells(root);
+
+        primary = list_empty(&hose_list);
+        phb = alloc_phb_dynamic(dn, root_size_cells);
+        if (!phb)
+                return NULL;
+
+        pci_process_bridge_OF_ranges(phb, dn);
+
+        pci_setup_phb_io_dynamic(phb, primary);
+        of_node_put(root);
+
+        pci_devs_phb_init_dynamic(phb);
+        phb->last_busno = 0xff;
+        bus = pci_scan_bus(phb->first_busno, phb->ops, phb->arch_data);
+        phb->bus = bus;
+        phb->last_busno = bus->subordinate;
+
+        return phb;
+}
+EXPORT_SYMBOL(init_phb_dynamic);
+
+/* RPA-specific bits for removing PHBs */
+int pcibios_remove_root_bus(struct pci_controller *phb)
+{
+        struct pci_bus *b = phb->bus;
+        struct resource *res;
+        int rc, i;
+
+        res = b->resource[0];
+        if (!res->flags) {
+                printk(KERN_ERR "%s: no IO resource for PHB %s\n", __FUNCTION__,
+                                b->name);
+                return 1;
+        }
+
+        rc = unmap_bus_range(b);
+        if (rc) {
+                printk(KERN_ERR "%s: failed to unmap IO on bus %s\n",
+                        __FUNCTION__, b->name);
+                return 1;
+        }
+
+        if (release_resource(res)) {
+                printk(KERN_ERR "%s: failed to release IO on bus %s\n",
+                                __FUNCTION__, b->name);
+                return 1;
+        }
+
+        for (i = 1; i < 3; ++i) {
+                res = b->resource[i];
+                if (!res->flags && i == 0) {
+                        printk(KERN_ERR "%s: no MEM resource for PHB %s\n",
+                                __FUNCTION__, b->name);
+                        return 1;
+                }
+                if (res->flags && release_resource(res)) {
+                        printk(KERN_ERR
+                               "%s: failed to release IO %d on bus %s\n",
+                                __FUNCTION__, i, b->name);
+                        return 1;
+                }
+        }
+
+        list_del(&phb->list_node);
+        if (phb->is_dynamic)
+                kfree(phb);
+
+        return 0;
+}
+EXPORT_SYMBOL(pcibios_remove_root_bus);