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Diffstat (limited to 'arch/sparc/kernel/pci_common.c')
-rw-r--r--arch/sparc/kernel/pci_common.c545
1 files changed, 545 insertions, 0 deletions
diff --git a/arch/sparc/kernel/pci_common.c b/arch/sparc/kernel/pci_common.c
new file mode 100644
index 00000000000..23b88082d0b
--- /dev/null
+++ b/arch/sparc/kernel/pci_common.c
@@ -0,0 +1,545 @@
+/* pci_common.c: PCI controller common support.
+ *
+ * Copyright (C) 1999, 2007 David S. Miller (davem@davemloft.net)
+ */
+
+#include <linux/string.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/pci.h>
+#include <linux/device.h>
+#include <linux/of_device.h>
+
+#include <asm/prom.h>
+#include <asm/oplib.h>
+
+#include "pci_impl.h"
+#include "pci_sun4v.h"
+
+static int config_out_of_range(struct pci_pbm_info *pbm,
+ unsigned long bus,
+ unsigned long devfn,
+ unsigned long reg)
+{
+ if (bus < pbm->pci_first_busno ||
+ bus > pbm->pci_last_busno)
+ return 1;
+ return 0;
+}
+
+static void *sun4u_config_mkaddr(struct pci_pbm_info *pbm,
+ unsigned long bus,
+ unsigned long devfn,
+ unsigned long reg)
+{
+ unsigned long rbits = pbm->config_space_reg_bits;
+
+ if (config_out_of_range(pbm, bus, devfn, reg))
+ return NULL;
+
+ reg = (reg & ((1 << rbits) - 1));
+ devfn <<= rbits;
+ bus <<= rbits + 8;
+
+ return (void *) (pbm->config_space | bus | devfn | reg);
+}
+
+/* At least on Sabre, it is necessary to access all PCI host controller
+ * registers at their natural size, otherwise zeros are returned.
+ * Strange but true, and I see no language in the UltraSPARC-IIi
+ * programmer's manual that mentions this even indirectly.
+ */
+static int sun4u_read_pci_cfg_host(struct pci_pbm_info *pbm,
+ unsigned char bus, unsigned int devfn,
+ int where, int size, u32 *value)
+{
+ u32 tmp32, *addr;
+ u16 tmp16;
+ u8 tmp8;
+
+ addr = sun4u_config_mkaddr(pbm, bus, devfn, where);
+ if (!addr)
+ return PCIBIOS_SUCCESSFUL;
+
+ switch (size) {
+ case 1:
+ if (where < 8) {
+ unsigned long align = (unsigned long) addr;
+
+ align &= ~1;
+ pci_config_read16((u16 *)align, &tmp16);
+ if (where & 1)
+ *value = tmp16 >> 8;
+ else
+ *value = tmp16 & 0xff;
+ } else {
+ pci_config_read8((u8 *)addr, &tmp8);
+ *value = (u32) tmp8;
+ }
+ break;
+
+ case 2:
+ if (where < 8) {
+ pci_config_read16((u16 *)addr, &tmp16);
+ *value = (u32) tmp16;
+ } else {
+ pci_config_read8((u8 *)addr, &tmp8);
+ *value = (u32) tmp8;
+ pci_config_read8(((u8 *)addr) + 1, &tmp8);
+ *value |= ((u32) tmp8) << 8;
+ }
+ break;
+
+ case 4:
+ tmp32 = 0xffffffff;
+ sun4u_read_pci_cfg_host(pbm, bus, devfn,
+ where, 2, &tmp32);
+ *value = tmp32;
+
+ tmp32 = 0xffffffff;
+ sun4u_read_pci_cfg_host(pbm, bus, devfn,
+ where + 2, 2, &tmp32);
+ *value |= tmp32 << 16;
+ break;
+ }
+ return PCIBIOS_SUCCESSFUL;
+}
+
+static int sun4u_read_pci_cfg(struct pci_bus *bus_dev, unsigned int devfn,
+ int where, int size, u32 *value)
+{
+ struct pci_pbm_info *pbm = bus_dev->sysdata;
+ unsigned char bus = bus_dev->number;
+ u32 *addr;
+ u16 tmp16;
+ u8 tmp8;
+
+ switch (size) {
+ case 1:
+ *value = 0xff;
+ break;
+ case 2:
+ *value = 0xffff;
+ break;
+ case 4:
+ *value = 0xffffffff;
+ break;
+ }
+
+ if (!bus_dev->number && !PCI_SLOT(devfn))
+ return sun4u_read_pci_cfg_host(pbm, bus, devfn, where,
+ size, value);
+
+ addr = sun4u_config_mkaddr(pbm, bus, devfn, where);
+ if (!addr)
+ return PCIBIOS_SUCCESSFUL;
+
+ switch (size) {
+ case 1:
+ pci_config_read8((u8 *)addr, &tmp8);
+ *value = (u32) tmp8;
+ break;
+
+ case 2:
+ if (where & 0x01) {
+ printk("pci_read_config_word: misaligned reg [%x]\n",
+ where);
+ return PCIBIOS_SUCCESSFUL;
+ }
+ pci_config_read16((u16 *)addr, &tmp16);
+ *value = (u32) tmp16;
+ break;
+
+ case 4:
+ if (where & 0x03) {
+ printk("pci_read_config_dword: misaligned reg [%x]\n",
+ where);
+ return PCIBIOS_SUCCESSFUL;
+ }
+ pci_config_read32(addr, value);
+ break;
+ }
+ return PCIBIOS_SUCCESSFUL;
+}
+
+static int sun4u_write_pci_cfg_host(struct pci_pbm_info *pbm,
+ unsigned char bus, unsigned int devfn,
+ int where, int size, u32 value)
+{
+ u32 *addr;
+
+ addr = sun4u_config_mkaddr(pbm, bus, devfn, where);
+ if (!addr)
+ return PCIBIOS_SUCCESSFUL;
+
+ switch (size) {
+ case 1:
+ if (where < 8) {
+ unsigned long align = (unsigned long) addr;
+ u16 tmp16;
+
+ align &= ~1;
+ pci_config_read16((u16 *)align, &tmp16);
+ if (where & 1) {
+ tmp16 &= 0x00ff;
+ tmp16 |= value << 8;
+ } else {
+ tmp16 &= 0xff00;
+ tmp16 |= value;
+ }
+ pci_config_write16((u16 *)align, tmp16);
+ } else
+ pci_config_write8((u8 *)addr, value);
+ break;
+ case 2:
+ if (where < 8) {
+ pci_config_write16((u16 *)addr, value);
+ } else {
+ pci_config_write8((u8 *)addr, value & 0xff);
+ pci_config_write8(((u8 *)addr) + 1, value >> 8);
+ }
+ break;
+ case 4:
+ sun4u_write_pci_cfg_host(pbm, bus, devfn,
+ where, 2, value & 0xffff);
+ sun4u_write_pci_cfg_host(pbm, bus, devfn,
+ where + 2, 2, value >> 16);
+ break;
+ }
+ return PCIBIOS_SUCCESSFUL;
+}
+
+static int sun4u_write_pci_cfg(struct pci_bus *bus_dev, unsigned int devfn,
+ int where, int size, u32 value)
+{
+ struct pci_pbm_info *pbm = bus_dev->sysdata;
+ unsigned char bus = bus_dev->number;
+ u32 *addr;
+
+ if (!bus_dev->number && !PCI_SLOT(devfn))
+ return sun4u_write_pci_cfg_host(pbm, bus, devfn, where,
+ size, value);
+
+ addr = sun4u_config_mkaddr(pbm, bus, devfn, where);
+ if (!addr)
+ return PCIBIOS_SUCCESSFUL;
+
+ switch (size) {
+ case 1:
+ pci_config_write8((u8 *)addr, value);
+ break;
+
+ case 2:
+ if (where & 0x01) {
+ printk("pci_write_config_word: misaligned reg [%x]\n",
+ where);
+ return PCIBIOS_SUCCESSFUL;
+ }
+ pci_config_write16((u16 *)addr, value);
+ break;
+
+ case 4:
+ if (where & 0x03) {
+ printk("pci_write_config_dword: misaligned reg [%x]\n",
+ where);
+ return PCIBIOS_SUCCESSFUL;
+ }
+ pci_config_write32(addr, value);
+ }
+ return PCIBIOS_SUCCESSFUL;
+}
+
+struct pci_ops sun4u_pci_ops = {
+ .read = sun4u_read_pci_cfg,
+ .write = sun4u_write_pci_cfg,
+};
+
+static int sun4v_read_pci_cfg(struct pci_bus *bus_dev, unsigned int devfn,
+ int where, int size, u32 *value)
+{
+ struct pci_pbm_info *pbm = bus_dev->sysdata;
+ u32 devhandle = pbm->devhandle;
+ unsigned int bus = bus_dev->number;
+ unsigned int device = PCI_SLOT(devfn);
+ unsigned int func = PCI_FUNC(devfn);
+ unsigned long ret;
+
+ if (config_out_of_range(pbm, bus, devfn, where)) {
+ ret = ~0UL;
+ } else {
+ ret = pci_sun4v_config_get(devhandle,
+ HV_PCI_DEVICE_BUILD(bus, device, func),
+ where, size);
+ }
+ switch (size) {
+ case 1:
+ *value = ret & 0xff;
+ break;
+ case 2:
+ *value = ret & 0xffff;
+ break;
+ case 4:
+ *value = ret & 0xffffffff;
+ break;
+ };
+
+
+ return PCIBIOS_SUCCESSFUL;
+}
+
+static int sun4v_write_pci_cfg(struct pci_bus *bus_dev, unsigned int devfn,
+ int where, int size, u32 value)
+{
+ struct pci_pbm_info *pbm = bus_dev->sysdata;
+ u32 devhandle = pbm->devhandle;
+ unsigned int bus = bus_dev->number;
+ unsigned int device = PCI_SLOT(devfn);
+ unsigned int func = PCI_FUNC(devfn);
+ unsigned long ret;
+
+ if (config_out_of_range(pbm, bus, devfn, where)) {
+ /* Do nothing. */
+ } else {
+ ret = pci_sun4v_config_put(devhandle,
+ HV_PCI_DEVICE_BUILD(bus, device, func),
+ where, size, value);
+ }
+ return PCIBIOS_SUCCESSFUL;
+}
+
+struct pci_ops sun4v_pci_ops = {
+ .read = sun4v_read_pci_cfg,
+ .write = sun4v_write_pci_cfg,
+};
+
+void pci_get_pbm_props(struct pci_pbm_info *pbm)
+{
+ const u32 *val = of_get_property(pbm->op->node, "bus-range", NULL);
+
+ pbm->pci_first_busno = val[0];
+ pbm->pci_last_busno = val[1];
+
+ val = of_get_property(pbm->op->node, "ino-bitmap", NULL);
+ if (val) {
+ pbm->ino_bitmap = (((u64)val[1] << 32UL) |
+ ((u64)val[0] << 0UL));
+ }
+}
+
+static void pci_register_legacy_regions(struct resource *io_res,
+ struct resource *mem_res)
+{
+ struct resource *p;
+
+ /* VGA Video RAM. */
+ p = kzalloc(sizeof(*p), GFP_KERNEL);
+ if (!p)
+ return;
+
+ p->name = "Video RAM area";
+ p->start = mem_res->start + 0xa0000UL;
+ p->end = p->start + 0x1ffffUL;
+ p->flags = IORESOURCE_BUSY;
+ request_resource(mem_res, p);
+
+ p = kzalloc(sizeof(*p), GFP_KERNEL);
+ if (!p)
+ return;
+
+ p->name = "System ROM";
+ p->start = mem_res->start + 0xf0000UL;
+ p->end = p->start + 0xffffUL;
+ p->flags = IORESOURCE_BUSY;
+ request_resource(mem_res, p);
+
+ p = kzalloc(sizeof(*p), GFP_KERNEL);
+ if (!p)
+ return;
+
+ p->name = "Video ROM";
+ p->start = mem_res->start + 0xc0000UL;
+ p->end = p->start + 0x7fffUL;
+ p->flags = IORESOURCE_BUSY;
+ request_resource(mem_res, p);
+}
+
+static void pci_register_iommu_region(struct pci_pbm_info *pbm)
+{
+ const u32 *vdma = of_get_property(pbm->op->node, "virtual-dma", NULL);
+
+ if (vdma) {
+ struct resource *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) vdma[0];
+ rp->end = rp->start + (unsigned long) vdma[1] - 1UL;
+ rp->flags = IORESOURCE_BUSY;
+ request_resource(&pbm->mem_space, rp);
+ }
+}
+
+void pci_determine_mem_io_space(struct pci_pbm_info *pbm)
+{
+ const struct linux_prom_pci_ranges *pbm_ranges;
+ int i, saw_mem, saw_io;
+ int num_pbm_ranges;
+
+ saw_mem = saw_io = 0;
+ pbm_ranges = of_get_property(pbm->op->node, "ranges", &i);
+ if (!pbm_ranges) {
+ prom_printf("PCI: Fatal error, missing PBM ranges property "
+ " for %s\n",
+ pbm->name);
+ prom_halt();
+ }
+
+ num_pbm_ranges = i / sizeof(*pbm_ranges);
+
+ for (i = 0; i < num_pbm_ranges; i++) {
+ const struct linux_prom_pci_ranges *pr = &pbm_ranges[i];
+ unsigned long a, size;
+ u32 parent_phys_hi, parent_phys_lo;
+ u32 size_hi, size_lo;
+ int type;
+
+ parent_phys_hi = pr->parent_phys_hi;
+ parent_phys_lo = pr->parent_phys_lo;
+ if (tlb_type == hypervisor)
+ parent_phys_hi &= 0x0fffffff;
+
+ size_hi = pr->size_hi;
+ size_lo = pr->size_lo;
+
+ type = (pr->child_phys_hi >> 24) & 0x3;
+ a = (((unsigned long)parent_phys_hi << 32UL) |
+ ((unsigned long)parent_phys_lo << 0UL));
+ size = (((unsigned long)size_hi << 32UL) |
+ ((unsigned long)size_lo << 0UL));
+
+ switch (type) {
+ case 0:
+ /* PCI config space, 16MB */
+ pbm->config_space = a;
+ break;
+
+ case 1:
+ /* 16-bit IO space, 16MB */
+ pbm->io_space.start = a;
+ pbm->io_space.end = a + size - 1UL;
+ pbm->io_space.flags = IORESOURCE_IO;
+ saw_io = 1;
+ break;
+
+ case 2:
+ /* 32-bit MEM space, 2GB */
+ pbm->mem_space.start = a;
+ pbm->mem_space.end = a + size - 1UL;
+ pbm->mem_space.flags = IORESOURCE_MEM;
+ saw_mem = 1;
+ break;
+
+ case 3:
+ /* XXX 64-bit MEM handling XXX */
+
+ default:
+ break;
+ };
+ }
+
+ if (!saw_io || !saw_mem) {
+ prom_printf("%s: Fatal error, missing %s PBM range.\n",
+ pbm->name,
+ (!saw_io ? "IO" : "MEM"));
+ prom_halt();
+ }
+
+ printk("%s: PCI IO[%lx] MEM[%lx]\n",
+ pbm->name,
+ pbm->io_space.start,
+ pbm->mem_space.start);
+
+ pbm->io_space.name = pbm->mem_space.name = pbm->name;
+
+ request_resource(&ioport_resource, &pbm->io_space);
+ request_resource(&iomem_resource, &pbm->mem_space);
+
+ pci_register_legacy_regions(&pbm->io_space,
+ &pbm->mem_space);
+ pci_register_iommu_region(pbm);
+}
+
+/* Generic helper routines for PCI error reporting. */
+void pci_scan_for_target_abort(struct pci_pbm_info *pbm,
+ struct pci_bus *pbus)
+{
+ struct pci_dev *pdev;
+ struct pci_bus *bus;
+
+ list_for_each_entry(pdev, &pbus->devices, bus_list) {
+ u16 status, error_bits;
+
+ pci_read_config_word(pdev, PCI_STATUS, &status);
+ error_bits =
+ (status & (PCI_STATUS_SIG_TARGET_ABORT |
+ PCI_STATUS_REC_TARGET_ABORT));
+ if (error_bits) {
+ pci_write_config_word(pdev, PCI_STATUS, error_bits);
+ printk("%s: Device %s saw Target Abort [%016x]\n",
+ pbm->name, pci_name(pdev), status);
+ }
+ }
+
+ list_for_each_entry(bus, &pbus->children, node)
+ pci_scan_for_target_abort(pbm, bus);
+}
+
+void pci_scan_for_master_abort(struct pci_pbm_info *pbm,
+ struct pci_bus *pbus)
+{
+ struct pci_dev *pdev;
+ struct pci_bus *bus;
+
+ list_for_each_entry(pdev, &pbus->devices, bus_list) {
+ u16 status, error_bits;
+
+ pci_read_config_word(pdev, PCI_STATUS, &status);
+ error_bits =
+ (status & (PCI_STATUS_REC_MASTER_ABORT));
+ if (error_bits) {
+ pci_write_config_word(pdev, PCI_STATUS, error_bits);
+ printk("%s: Device %s received Master Abort [%016x]\n",
+ pbm->name, pci_name(pdev), status);
+ }
+ }
+
+ list_for_each_entry(bus, &pbus->children, node)
+ pci_scan_for_master_abort(pbm, bus);
+}
+
+void pci_scan_for_parity_error(struct pci_pbm_info *pbm,
+ struct pci_bus *pbus)
+{
+ struct pci_dev *pdev;
+ struct pci_bus *bus;
+
+ list_for_each_entry(pdev, &pbus->devices, bus_list) {
+ u16 status, error_bits;
+
+ pci_read_config_word(pdev, PCI_STATUS, &status);
+ error_bits =
+ (status & (PCI_STATUS_PARITY |
+ PCI_STATUS_DETECTED_PARITY));
+ if (error_bits) {
+ pci_write_config_word(pdev, PCI_STATUS, error_bits);
+ printk("%s: Device %s saw Parity Error [%016x]\n",
+ pbm->name, pci_name(pdev), status);
+ }
+ }
+
+ list_for_each_entry(bus, &pbus->children, node)
+ pci_scan_for_parity_error(pbm, bus);
+}
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