[SPARC64]: Fix sabre pci controllers with new probing scheme.

The SIMBA APB bridge is strange, it is a PCI bridge but it lacks
some standard OF properties, in particular it lacks a 'ranges'
property.

What you have to do is read the IO and MEM range registers in
the APB bridge to determine the ranges handled by each bridge.
So fill in the bus resources by doing that.

Since we now handle this quirk in the generic PCI and OF device
probing layers, we can flat out eliminate all of that code from
the sabre pci controller driver.

In fact we can thus eliminate completely another quirk of the sabre
driver.  It tried to make the two APB bridges look like PBMs but that
makes zero sense now (and it's questionable whether it ever made sense).
So now just use pbm_A and probe the whole PCI hierarchy using that as
the root.

This simplification allows many future cleanups to occur.

Also, I've found yet another quirk that needs to be worked around
while testing this.  You can't use the 'class-code' OF firmware
property, especially for IDE controllers.  We have to read the value
out of PCI config space or else we'll see the value the device was
showing before it was programmed into native mode.

I'm starting to think it might be wise to just read all of the values
out of PCI config space instead of using the OF properties. :-/

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 62 insertions, 278 deletions

diff --git a/arch/sparc64/kernel/pci_sabre.c b/arch/sparc64/kernel/pci_sabre.c
index bbf624517508..f4e346092a53 100644
--- a/arch/sparc64/kernel/pci_sabre.c
+++ b/arch/sparc64/kernel/pci_sabre.c
@@ -254,9 +254,6 @@ static int __sabre_out_of_range(struct pci_pbm_info *pbm,
                 return 0;
 
         return ((pbm->parent == 0) ||
-                ((pbm == &pbm->parent->pbm_B) &&
-                 (bus == pbm->pci_first_busno) &&
-                 PCI_SLOT(devfn) > 8) ||
                 ((pbm == &pbm->parent->pbm_A) &&
                  (bus == pbm->pci_first_busno) &&
                  PCI_SLOT(devfn) > 8));
@@ -800,12 +797,10 @@ static irqreturn_t sabre_pcierr_intr(int irq, void *dev_id)
         if (error_bits & (SABRE_PIOAFSR_PTA | SABRE_PIOAFSR_STA)) {
                 sabre_check_iommu_error(p, afsr, afar);
                 pci_scan_for_target_abort(p, &p->pbm_A, p->pbm_A.pci_bus);
-                pci_scan_for_target_abort(p, &p->pbm_B, p->pbm_B.pci_bus);
         }
-        if (error_bits & (SABRE_PIOAFSR_PMA | SABRE_PIOAFSR_SMA)) {
+        if (error_bits & (SABRE_PIOAFSR_PMA | SABRE_PIOAFSR_SMA))
                 pci_scan_for_master_abort(p, &p->pbm_A, p->pbm_A.pci_bus);
-                pci_scan_for_master_abort(p, &p->pbm_B, p->pbm_B.pci_bus);
-        }
+
         /* For excessive retries, SABRE/PBM will abort the device
          * and there is no way to specifically check for excessive
          * retries in the config space status registers.  So what
@@ -813,10 +808,8 @@ static irqreturn_t sabre_pcierr_intr(int irq, void *dev_id)
          * abort events.
          */
 
-        if (error_bits & (SABRE_PIOAFSR_PPERR | SABRE_PIOAFSR_SPERR)) {
+        if (error_bits & (SABRE_PIOAFSR_PPERR | SABRE_PIOAFSR_SPERR))
                 pci_scan_for_parity_error(p, &p->pbm_A, p->pbm_A.pci_bus);
-                pci_scan_for_parity_error(p, &p->pbm_B, p->pbm_B.pci_bus);
-        }
 
         return IRQ_HANDLED;
 }
@@ -935,44 +928,33 @@ static void apb_init(struct pci_controller_info *p, struct pci_bus *sabre_bus)
         struct pci_dev *pdev;
 
         list_for_each_entry(pdev, &sabre_bus->devices, bus_list) {
-
                 if (pdev->vendor == PCI_VENDOR_ID_SUN &&
                     pdev->device == PCI_DEVICE_ID_SUN_SIMBA) {
-                        u32 word32;
                         u16 word16;
 
-                        sabre_read_pci_cfg(pdev->bus, pdev->devfn,
-                                           PCI_COMMAND, 2, &word32);
-                        word16 = (u16) word32;
+                        pci_read_config_word(pdev, PCI_COMMAND, &word16);
                         word16 |= PCI_COMMAND_SERR | PCI_COMMAND_PARITY |
                                 PCI_COMMAND_MASTER | PCI_COMMAND_MEMORY |
                                 PCI_COMMAND_IO;
-                        word32 = (u32) word16;
-                        sabre_write_pci_cfg(pdev->bus, pdev->devfn,
-                                            PCI_COMMAND, 2, word32);
+                        pci_write_config_word(pdev, PCI_COMMAND, word16);
 
                         /* Status register bits are "write 1 to clear". */
-                        sabre_write_pci_cfg(pdev->bus, pdev->devfn,
-                                            PCI_STATUS, 2, 0xffff);
-                        sabre_write_pci_cfg(pdev->bus, pdev->devfn,
-                                            PCI_SEC_STATUS, 2, 0xffff);
+                        pci_write_config_word(pdev, PCI_STATUS, 0xffff);
+                        pci_write_config_word(pdev, PCI_SEC_STATUS, 0xffff);
 
                         /* Use a primary/seconday latency timer value
                          * of 64.
                          */
-                        sabre_write_pci_cfg(pdev->bus, pdev->devfn,
-                                            PCI_LATENCY_TIMER, 1, 64);
-                        sabre_write_pci_cfg(pdev->bus, pdev->devfn,
-                                            PCI_SEC_LATENCY_TIMER, 1, 64);
+                        pci_write_config_byte(pdev, PCI_LATENCY_TIMER, 64);
+                        pci_write_config_byte(pdev, PCI_SEC_LATENCY_TIMER, 64);
 
                         /* Enable reporting/forwarding of master aborts,
                          * parity, and SERR.
                          */
-                        sabre_write_pci_cfg(pdev->bus, pdev->devfn,
-                                            PCI_BRIDGE_CONTROL, 1,
-                                            (PCI_BRIDGE_CTL_PARITY |
-                                             PCI_BRIDGE_CTL_SERR |
-                                             PCI_BRIDGE_CTL_MASTER_ABORT));
+                        pci_write_config_byte(pdev, PCI_BRIDGE_CONTROL,
+                                              (PCI_BRIDGE_CTL_PARITY |
+                                               PCI_BRIDGE_CTL_SERR |
+                                               PCI_BRIDGE_CTL_MASTER_ABORT));
                 }
         }
 }
@@ -980,16 +962,13 @@ static void apb_init(struct pci_controller_info *p, struct pci_bus *sabre_bus)
 static void sabre_scan_bus(struct pci_controller_info *p)
 {
         static int once;
-        struct pci_bus *sabre_bus, *pbus;
-        struct pci_pbm_info *pbm;
-        int sabres_scanned;
+        struct pci_bus *pbus;
 
         /* The APB bridge speaks to the Sabre host PCI bridge
          * at 66Mhz, but the front side of APB runs at 33Mhz
          * for both segments.
          */
         p->pbm_A.is_66mhz_capable = 0;
-        p->pbm_B.is_66mhz_capable = 0;
 
         /* This driver has not been verified to handle
          * multiple SABREs yet, so trap this.
@@ -1003,36 +982,13 @@ static void sabre_scan_bus(struct pci_controller_info *p)
         }
         once++;
 
-        sabre_bus = pci_scan_one_pbm(&p->pbm_A);
-        if (!sabre_bus)
+        pbus = pci_scan_one_pbm(&p->pbm_A);
+        if (!pbus)
                 return;
 
-        sabre_root_bus = sabre_bus;
-
-        apb_init(p, sabre_bus);
-
-        sabres_scanned = 0;
+        sabre_root_bus = pbus;
 
-        list_for_each_entry(pbus, &sabre_bus->children, node) {
-
-                if (pbus->number == p->pbm_A.pci_first_busno) {
-                        pbm = &p->pbm_A;
-                } else if (pbus->number == p->pbm_B.pci_first_busno) {
-                        pbm = &p->pbm_B;
-                } else
-                        continue;
-
-                sabres_scanned++;
-                pbus->sysdata = pbm;
-                pbm->pci_bus = pbus;
-        }
-
-        if (!sabres_scanned) {
-                /* Hummingbird, no APBs. */
-                pbm = &p->pbm_A;
-                sabre_bus->sysdata = pbm;
-                pbm->pci_bus = sabre_bus;
-        }
+        apb_init(p, pbus);
 
         sabre_register_error_handlers(p);
 }
@@ -1089,213 +1045,54 @@ static void sabre_iommu_init(struct pci_controller_info *p,
         sabre_write(p->pbm_A.controller_regs + SABRE_IOMMU_CONTROL, control);
 }
 
-static void pbm_register_toplevel_resources(struct pci_controller_info *p,
-                                            struct pci_pbm_info *pbm)
+static void sabre_pbm_init(struct pci_controller_info *p, struct device_node *dp, u32 dma_start, u32 dma_end)
 {
-        char *name = pbm->name;
-        unsigned long ibase = p->pbm_A.controller_regs + SABRE_IOSPACE;
-        unsigned long mbase = p->pbm_A.controller_regs + SABRE_MEMSPACE;
-        unsigned int devfn;
-        unsigned long first, last, i;
-        u8 *addr, map;
-
-        sprintf(name, "SABRE%d PBM%c",
-                p->index,
-                (pbm == &p->pbm_A ? 'A' : 'B'));
-        pbm->io_space.name = pbm->mem_space.name = name;
-
-        devfn = PCI_DEVFN(1, (pbm == &p->pbm_A) ? 0 : 1);
-        addr = sabre_pci_config_mkaddr(pbm, 0, devfn, APB_IO_ADDRESS_MAP);
-        map = 0;
-        pci_config_read8(addr, &map);
-
-        first = 8;
-        last = 0;
-        for (i = 0; i < 8; i++) {
-                if ((map & (1 << i)) != 0) {
-                        if (first > i)
-                                first = i;
-                        if (last < i)
-                                last = i;
-                }
-        }
-        pbm->io_space.start = ibase + (first << 21UL);
-        pbm->io_space.end   = ibase + (last << 21UL) + ((1 << 21UL) - 1);
+        struct pci_pbm_info *pbm;
+        struct resource *rp;
+
+        pbm = &p->pbm_A;
+        pbm->name = dp->full_name;
+        printk("%s: SABRE PCI Bus Module\n", pbm->name);
+
+        pbm->chip_type = PBM_CHIP_TYPE_SABRE;
+        pbm->parent = p;
+        pbm->prom_node = dp;
+        pbm->pci_first_slot = 1;
+        pbm->pci_first_busno = p->pci_first_busno;
+        pbm->pci_last_busno = p->pci_last_busno;
+
+        pbm->io_space.name = pbm->mem_space.name = pbm->name;
+
+        pbm->io_space.start = p->pbm_A.controller_regs + SABRE_IOSPACE;
+        pbm->io_space.end   = pbm->io_space.start + (1UL << 24) - 1UL;
         pbm->io_space.flags = IORESOURCE_IO;
 
-        addr = sabre_pci_config_mkaddr(pbm, 0, devfn, APB_MEM_ADDRESS_MAP);
-        map = 0;
-        pci_config_read8(addr, &map);
-
-        first = 8;
-        last = 0;
-        for (i = 0; i < 8; i++) {
-                if ((map & (1 << i)) != 0) {
-                        if (first > i)
-                                first = i;
-                        if (last < i)
-                                last = i;
-                }
-        }
-        pbm->mem_space.start = mbase + (first << 29UL);
-        pbm->mem_space.end   = mbase + (last << 29UL) + ((1 << 29UL) - 1);
+        pbm->mem_space.start = (p->pbm_A.controller_regs + SABRE_MEMSPACE);
+        pbm->mem_space.end = (pbm->mem_space.start + ((1UL << 32UL) - 1UL));
         pbm->mem_space.flags = IORESOURCE_MEM;
 
         if (request_resource(&ioport_resource, &pbm->io_space) < 0) {
-                prom_printf("Cannot register PBM-%c's IO space.\n",
-                            (pbm == &p->pbm_A ? 'A' : 'B'));
+                prom_printf("Cannot register Sabre's IO space.\n");
                 prom_halt();
         }
         if (request_resource(&iomem_resource, &pbm->mem_space) < 0) {
-                prom_printf("Cannot register PBM-%c's MEM space.\n",
-                            (pbm == &p->pbm_A ? 'A' : 'B'));
+                prom_printf("Cannot register Sabre's MEM space.\n");
                 prom_halt();
         }
 
-        /* Register legacy regions if this PBM covers that area. */
-        if (pbm->io_space.start == ibase &&
-            pbm->mem_space.start == mbase)
-                pci_register_legacy_regions(&pbm->io_space,
-                                            &pbm->mem_space);
-}
-
-static void sabre_pbm_init(struct pci_controller_info *p, struct device_node *dp, u32 dma_start, u32 dma_end)
-{
-        struct pci_pbm_info *pbm;
-        struct device_node *node;
-        struct property *prop;
-        u32 *busrange;
-        int len, simbas_found;
-
-        simbas_found = 0;
-        node = dp->child;
-        while (node != NULL) {
-                if (strcmp(node->name, "pci"))
-                        goto next_pci;
-
-                prop = of_find_property(node, "model", NULL);
-                if (!prop || strncmp(prop->value, "SUNW,simba", prop->length))
-                        goto next_pci;
-
-                simbas_found++;
-
-                prop = of_find_property(node, "bus-range", NULL);
-                busrange = prop->value;
-                if (busrange[0] == 1)
-                        pbm = &p->pbm_B;
-                else
-                        pbm = &p->pbm_A;
-
-                pbm->name = node->full_name;
-                printk("%s: SABRE PCI Bus Module\n", pbm->name);
-
-                pbm->chip_type = PBM_CHIP_TYPE_SABRE;
-                pbm->parent = p;
-                pbm->prom_node = node;
-                pbm->pci_first_slot = 1;
-                pbm->pci_first_busno = busrange[0];
-                pbm->pci_last_busno = busrange[1];
-
-                prop = of_find_property(node, "ranges", &len);
-                if (prop) {
-                        pbm->pbm_ranges = prop->value;
-                        pbm->num_pbm_ranges =
-                                (len / sizeof(struct linux_prom_pci_ranges));
-                } else {
-                        pbm->num_pbm_ranges = 0;
-                }
-
-                prop = of_find_property(node, "interrupt-map", &len);
-                if (prop) {
-                        pbm->pbm_intmap = prop->value;
-                        pbm->num_pbm_intmap =
-                                (len / sizeof(struct linux_prom_pci_intmap));
-
-                        prop = of_find_property(node, "interrupt-map-mask",
-                                                NULL);
-                        pbm->pbm_intmask = prop->value;
-                } else {
-                        pbm->num_pbm_intmap = 0;
-                }
-
-                pbm_register_toplevel_resources(p, pbm);
-
-        next_pci:
-                node = node->sibling;
-        }
-        if (simbas_found == 0) {
-                struct resource *rp;
-
-                /* No APBs underneath, probably this is a hummingbird
-                 * system.
-                 */
-                pbm = &p->pbm_A;
-                pbm->parent = p;
-                pbm->prom_node = dp;
-                pbm->pci_first_busno = p->pci_first_busno;
-                pbm->pci_last_busno = p->pci_last_busno;
-
-                prop = of_find_property(dp, "ranges", &len);
-                if (prop) {
-                        pbm->pbm_ranges = prop->value;
-                        pbm->num_pbm_ranges =
-                                (len / sizeof(struct linux_prom_pci_ranges));
-                } else {
-                        pbm->num_pbm_ranges = 0;
-                }
-
-                prop = of_find_property(dp, "interrupt-map", &len);
-                if (prop) {
-                        pbm->pbm_intmap = prop->value;
-                        pbm->num_pbm_intmap =
-                                (len / sizeof(struct linux_prom_pci_intmap));
-
-                        prop = of_find_property(dp, "interrupt-map-mask",
-                                                NULL);
-                        pbm->pbm_intmask = prop->value;
-                } else {
-                        pbm->num_pbm_intmap = 0;
-                }
-
-                pbm->name = dp->full_name;
-                printk("%s: SABRE PCI Bus Module\n", pbm->name);
-
-                pbm->io_space.name = pbm->mem_space.name = pbm->name;
-
-                /* Hack up top-level resources. */
-                pbm->io_space.start = p->pbm_A.controller_regs + SABRE_IOSPACE;
-                pbm->io_space.end   = pbm->io_space.start + (1UL << 24) - 1UL;
-                pbm->io_space.flags = IORESOURCE_IO;
-
-                pbm->mem_space.start =
-                        (p->pbm_A.controller_regs + SABRE_MEMSPACE);
-                pbm->mem_space.end =
-                        (pbm->mem_space.start + ((1UL << 32UL) - 1UL));
-                pbm->mem_space.flags = IORESOURCE_MEM;
-
-                if (request_resource(&ioport_resource, &pbm->io_space) < 0) {
-                        prom_printf("Cannot register Hummingbird's IO space.\n");
-                        prom_halt();
-                }
-                if (request_resource(&iomem_resource, &pbm->mem_space) < 0) {
-                        prom_printf("Cannot register Hummingbird's MEM space.\n");
-                        prom_halt();
-                }
-
-                rp = kmalloc(sizeof(*rp), GFP_KERNEL);
-                if (!rp) {
-                        prom_printf("Cannot allocate IOMMU resource.\n");
-                        prom_halt();
-                }
-                rp->name = "IOMMU";
-                rp->start = pbm->mem_space.start + (unsigned long) dma_start;
-                rp->end = pbm->mem_space.start + (unsigned long) dma_end - 1UL;
-                rp->flags = IORESOURCE_BUSY;
-                request_resource(&pbm->mem_space, rp);
-
-                pci_register_legacy_regions(&pbm->io_space,
-                                            &pbm->mem_space);
+        rp = kmalloc(sizeof(*rp), GFP_KERNEL);
+        if (!rp) {
+                prom_printf("Cannot allocate IOMMU resource.\n");
+                prom_halt();
         }
+        rp->name = "IOMMU";
+        rp->start = pbm->mem_space.start + (unsigned long) dma_start;
+        rp->end = pbm->mem_space.start + (unsigned long) dma_end - 1UL;
+        rp->flags = IORESOURCE_BUSY;
+        request_resource(&pbm->mem_space, rp);
+
+        pci_register_legacy_regions(&pbm->io_space,
+                                    &pbm->mem_space);
 }
 
 void sabre_init(struct device_node *dp, char *model_name)
@@ -1303,7 +1100,6 @@ void sabre_init(struct device_node *dp, char *model_name)
         struct linux_prom64_registers *pr_regs;
         struct pci_controller_info *p;
         struct pci_iommu *iommu;
-        struct property *prop;
         int tsbsize;
         u32 *busrange;
         u32 *vdma;
@@ -1314,13 +1110,9 @@ void sabre_init(struct device_node *dp, char *model_name)
         if (!strcmp(model_name, "pci108e,a001"))
                 hummingbird_p = 1;
         else if (!strcmp(model_name, "SUNW,sabre")) {
-                prop = of_find_property(dp, "compatible", NULL);
-                if (prop) {
-                        const char *compat = prop->value;
-
-                        if (!strcmp(compat, "pci108e,a001"))
-                                hummingbird_p = 1;
-                }
+                const char *compat = of_get_property(dp, "compatible", NULL);
+                if (compat && !strcmp(compat, "pci108e,a001"))
+                        hummingbird_p = 1;
                 if (!hummingbird_p) {
                         struct device_node *dp;
 
@@ -1344,18 +1136,14 @@ void sabre_init(struct device_node *dp, char *model_name)
                 prom_printf("SABRE: Error, kmalloc(pci_iommu) failed.\n");
                 prom_halt();
         }
-        p->pbm_A.iommu = p->pbm_B.iommu = iommu;
+        p->pbm_A.iommu = iommu;
 
-        upa_portid = 0xff;
-        prop = of_find_property(dp, "upa-portid", NULL);
-        if (prop)
-                upa_portid = *(u32 *) prop->value;
+        upa_portid = of_getintprop_default(dp, "upa-portid", 0xff);
 
         p->next = pci_controller_root;
         pci_controller_root = p;
 
         p->pbm_A.portid = upa_portid;
-        p->pbm_B.portid = upa_portid;
         p->index = pci_num_controllers++;
         p->pbms_same_domain = 1;
         p->scan_bus = sabre_scan_bus;
@@ -1367,14 +1155,12 @@ void sabre_init(struct device_node *dp, char *model_name)
          * Map in SABRE register set and report the presence of this SABRE.
          */
         
-        prop = of_find_property(dp, "reg", NULL);
-        pr_regs = prop->value;
+        pr_regs = of_get_property(dp, "reg", NULL);
 
         /*
          * First REG in property is base of entire SABRE register space.
          */
         p->pbm_A.controller_regs = pr_regs[0].phys_addr;
-        p->pbm_B.controller_regs = pr_regs[0].phys_addr;
 
         /* Clear interrupts */
 
@@ -1392,11 +1178,10 @@ void sabre_init(struct device_node *dp, char *model_name)
                      SABRE_PCICTRL_ARBPARK | SABRE_PCICTRL_AEN));
 
         /* Now map in PCI config space for entire SABRE. */
-        p->pbm_A.config_space = p->pbm_B.config_space =
+        p->pbm_A.config_space =
                 (p->pbm_A.controller_regs + SABRE_CONFIGSPACE);
 
-        prop = of_find_property(dp, "virtual-dma", NULL);
-        vdma = prop->value;
+        vdma = of_get_property(dp, "virtual-dma", NULL);
 
         dma_mask = vdma[0];
         switch(vdma[1]) {
@@ -1420,8 +1205,7 @@ void sabre_init(struct device_node *dp, char *model_name)
 
         sabre_iommu_init(p, tsbsize, vdma[0], dma_mask);
 
-        prop = of_find_property(dp, "bus-range", NULL);
-        busrange = prop->value;
+        busrange = of_get_property(dp, "bus-range", NULL);
         p->pci_first_busno = busrange[0];
         p->pci_last_busno = busrange[1];