diff options
Diffstat (limited to 'arch/powerpc/platforms/cell')
| -rw-r--r-- | arch/powerpc/platforms/cell/Makefile | 3 | ||||
| -rw-r--r-- | arch/powerpc/platforms/cell/io-workarounds.c | 358 | ||||
| -rw-r--r-- | arch/powerpc/platforms/cell/io-workarounds.h | 49 | ||||
| -rw-r--r-- | arch/powerpc/platforms/cell/setup.c | 43 | ||||
| -rw-r--r-- | arch/powerpc/platforms/cell/spider-pci.c | 184 |
5 files changed, 376 insertions, 261 deletions
diff --git a/arch/powerpc/platforms/cell/Makefile b/arch/powerpc/platforms/cell/Makefile index c89964c..20966b7 100644 --- a/arch/powerpc/platforms/cell/Makefile +++ b/arch/powerpc/platforms/cell/Makefile @@ -1,6 +1,7 @@ obj-$(CONFIG_PPC_CELL_NATIVE) += interrupt.o iommu.o setup.o \ cbe_regs.o spider-pic.o \ - pervasive.o pmu.o io-workarounds.o + pervasive.o pmu.o io-workarounds.o \ + spider-pci.o obj-$(CONFIG_CBE_RAS) += ras.o obj-$(CONFIG_CBE_THERM) += cbe_thermal.o diff --git a/arch/powerpc/platforms/cell/io-workarounds.c b/arch/powerpc/platforms/cell/io-workarounds.c index 979d4b6..3b84e8b 100644 --- a/arch/powerpc/platforms/cell/io-workarounds.c +++ b/arch/powerpc/platforms/cell/io-workarounds.c @@ -1,6 +1,9 @@ /* + * Support PCI IO workaround + * * Copyright (C) 2006 Benjamin Herrenschmidt <benh@kernel.crashing.org> * IBM, Corp. + * (C) Copyright 2007-2008 TOSHIBA CORPORATION * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as @@ -9,335 +12,174 @@ #undef DEBUG #include <linux/kernel.h> -#include <linux/mm.h> -#include <linux/pci.h> + #include <asm/io.h> #include <asm/machdep.h> -#include <asm/pci-bridge.h> +#include <asm/pgtable.h> #include <asm/ppc-pci.h> +#include "io-workarounds.h" -#define SPIDER_PCI_REG_BASE 0xd000 -#define SPIDER_PCI_VCI_CNTL_STAT 0x0110 -#define SPIDER_PCI_DUMMY_READ 0x0810 -#define SPIDER_PCI_DUMMY_READ_BASE 0x0814 +#define IOWA_MAX_BUS 8 -/* Undefine that to re-enable bogus prefetch - * - * Without that workaround, the chip will do bogus prefetch past - * page boundary from system memory. This setting will disable that, - * though the documentation is unclear as to the consequences of doing - * so, either purely performances, or possible misbehaviour... It's not - * clear wether the chip can handle unaligned accesses at all without - * prefetching enabled. - * - * For now, things appear to be behaving properly with that prefetching - * disabled and IDE, possibly because IDE isn't doing any unaligned - * access. - */ -#define SPIDER_DISABLE_PREFETCH +static struct iowa_bus iowa_busses[IOWA_MAX_BUS]; +static unsigned int iowa_bus_count; -#define MAX_SPIDERS 3 +static struct iowa_bus *iowa_pci_find(unsigned long vaddr, unsigned long paddr) +{ + int i, j; + struct resource *res; + unsigned long vstart, vend; -static struct spider_pci_bus { - void __iomem *regs; - unsigned long mmio_start; - unsigned long mmio_end; - unsigned long pio_vstart; - unsigned long pio_vend; -} spider_pci_busses[MAX_SPIDERS]; -static int spider_pci_count; + for (i = 0; i < iowa_bus_count; i++) { + struct iowa_bus *bus = &iowa_busses[i]; + struct pci_controller *phb = bus->phb; -static struct spider_pci_bus *spider_pci_find(unsigned long vaddr, - unsigned long paddr) -{ - int i; - - for (i = 0; i < spider_pci_count; i++) { - struct spider_pci_bus *bus = &spider_pci_busses[i]; - if (paddr && paddr >= bus->mmio_start && paddr < bus->mmio_end) - return bus; - if (vaddr && vaddr >= bus->pio_vstart && vaddr < bus->pio_vend) - return bus; + if (vaddr) { + vstart = (unsigned long)phb->io_base_virt; + vend = vstart + phb->pci_io_size - 1; + if ((vaddr >= vstart) && (vaddr <= vend)) + return bus; + } + + if (paddr) + for (j = 0; j < 3; j++) { + res = &phb->mem_resources[j]; + if (paddr >= res->start && paddr <= res->end) + return bus; + } } + return NULL; } -static void spider_io_flush(const volatile void __iomem *addr) +struct iowa_bus *iowa_mem_find_bus(const PCI_IO_ADDR addr) { - struct spider_pci_bus *bus; + struct iowa_bus *bus; int token; - /* Get platform token (set by ioremap) from address */ token = PCI_GET_ADDR_TOKEN(addr); - /* Fast path if we have a non-0 token, it indicates which bus we - * are on. - * - * If the token is 0, that means either that the ioremap was done - * before we initialized this layer, or it's a PIO operation. We - * fallback to a low path in this case. Hopefully, internal devices - * which are ioremap'ed early should use in_XX/out_XX functions - * instead of the PCI ones and thus not suffer from the slowdown. - * - * Also note that currently, the workaround will not work for areas - * that are not mapped with PTEs (bolted in the hash table). This - * is the case for ioremaps done very early at boot (before - * mem_init_done) and includes the mapping of the ISA IO space. - * - * Fortunately, none of the affected devices is expected to do DMA - * and thus there should be no problem in practice. - * - * In order to improve performances, we only do the PTE search for - * addresses falling in the PHB IO space area. That means it will - * not work for hotplug'ed PHBs but those don't exist with Spider. - */ - if (token && token <= spider_pci_count) - bus = &spider_pci_busses[token - 1]; + if (token && token <= iowa_bus_count) + bus = &iowa_busses[token - 1]; else { unsigned long vaddr, paddr; pte_t *ptep; - /* Fixup physical address */ vaddr = (unsigned long)PCI_FIX_ADDR(addr); + if (vaddr < PHB_IO_BASE || vaddr >= PHB_IO_END) + return NULL; - /* Check if it's in allowed range for PIO */ - if (vaddr < PHB_IO_BASE || vaddr > PHB_IO_END) - return; - - /* Try to find a PTE. If not, clear the paddr, we'll do - * a vaddr only lookup (PIO only) - */ ptep = find_linux_pte(init_mm.pgd, vaddr); if (ptep == NULL) paddr = 0; else paddr = pte_pfn(*ptep) << PAGE_SHIFT; + bus = iowa_pci_find(vaddr, paddr); - bus = spider_pci_find(vaddr, paddr); if (bus == NULL) - return; + return NULL; } - /* Now do the workaround - */ - (void)in_be32(bus->regs + SPIDER_PCI_DUMMY_READ); + return bus; } -static u8 spider_readb(const volatile void __iomem *addr) +struct iowa_bus *iowa_pio_find_bus(unsigned long port) { - u8 val = __do_readb(addr); - spider_io_flush(addr); - return val; + unsigned long vaddr = (unsigned long)pci_io_base + port; + return iowa_pci_find(vaddr, 0); } -static u16 spider_readw(const volatile void __iomem *addr) -{ - u16 val = __do_readw(addr); - spider_io_flush(addr); - return val; -} -static u32 spider_readl(const volatile void __iomem *addr) -{ - u32 val = __do_readl(addr); - spider_io_flush(addr); - return val; +#define DEF_PCI_AC_RET(name, ret, at, al, space, aa) \ +static ret iowa_##name at \ +{ \ + struct iowa_bus *bus; \ + bus = iowa_##space##_find_bus(aa); \ + if (bus && bus->ops && bus->ops->name) \ + return bus->ops->name al; \ + return __do_##name al; \ } -static u64 spider_readq(const volatile void __iomem *addr) -{ - u64 val = __do_readq(addr); - spider_io_flush(addr); - return val; +#define DEF_PCI_AC_NORET(name, at, al, space, aa) \ +static void iowa_##name at \ +{ \ + struct iowa_bus *bus; \ + bus = iowa_##space##_find_bus(aa); \ + if (bus && bus->ops && bus->ops->name) { \ + bus->ops->name al; \ + return; \ + } \ + __do_##name al; \ } -static u16 spider_readw_be(const volatile void __iomem *addr) -{ - u16 val = __do_readw_be(addr); - spider_io_flush(addr); - return val; -} +#include <asm/io-defs.h> -static u32 spider_readl_be(const volatile void __iomem *addr) -{ - u32 val = __do_readl_be(addr); - spider_io_flush(addr); - return val; -} +#undef DEF_PCI_AC_RET +#undef DEF_PCI_AC_NORET -static u64 spider_readq_be(const volatile void __iomem *addr) -{ - u64 val = __do_readq_be(addr); - spider_io_flush(addr); - return val; -} +static struct ppc_pci_io __initdata iowa_pci_io = { -static void spider_readsb(const volatile void __iomem *addr, void *buf, - unsigned long count) -{ - __do_readsb(addr, buf, count); - spider_io_flush(addr); -} +#define DEF_PCI_AC_RET(name, ret, at, al, space, aa) .name = iowa_##name, +#define DEF_PCI_AC_NORET(name, at, al, space, aa) .name = iowa_##name, -static void spider_readsw(const volatile void __iomem *addr, void *buf, - unsigned long count) -{ - __do_readsw(addr, buf, count); - spider_io_flush(addr); -} +#include <asm/io-defs.h> -static void spider_readsl(const volatile void __iomem *addr, void *buf, - unsigned long count) -{ - __do_readsl(addr, buf, count); - spider_io_flush(addr); -} - -static void spider_memcpy_fromio(void *dest, const volatile void __iomem *src, - unsigned long n) -{ - __do_memcpy_fromio(dest, src, n); - spider_io_flush(src); -} +#undef DEF_PCI_AC_RET +#undef DEF_PCI_AC_NORET +}; -static void __iomem * spider_ioremap(unsigned long addr, unsigned long size, - unsigned long flags) +static void __iomem *iowa_ioremap(unsigned long addr, unsigned long size, + unsigned long flags) { - struct spider_pci_bus *bus; + struct iowa_bus *bus; void __iomem *res = __ioremap(addr, size, flags); int busno; - pr_debug("spider_ioremap(0x%lx, 0x%lx, 0x%lx) -> 0x%p\n", - addr, size, flags, res); - - bus = spider_pci_find(0, addr); + bus = iowa_pci_find(0, addr); if (bus != NULL) { - busno = bus - spider_pci_busses; - pr_debug(" found bus %d, setting token\n", busno); + busno = bus - iowa_busses; PCI_SET_ADDR_TOKEN(res, busno + 1); } - pr_debug(" result=0x%p\n", res); - return res; } -static void __init spider_pci_setup_chip(struct spider_pci_bus *bus) -{ -#ifdef SPIDER_DISABLE_PREFETCH - u32 val = in_be32(bus->regs + SPIDER_PCI_VCI_CNTL_STAT); - pr_debug(" PVCI_Control_Status was 0x%08x\n", val); - out_be32(bus->regs + SPIDER_PCI_VCI_CNTL_STAT, val | 0x8); -#endif - - /* Configure the dummy address for the workaround */ - out_be32(bus->regs + SPIDER_PCI_DUMMY_READ_BASE, 0x80000000); -} - -static void __init spider_pci_add_one(struct pci_controller *phb) +/* Regist new bus to support workaround */ +void __init iowa_register_bus(struct pci_controller *phb, + struct ppc_pci_io *ops, + int (*initfunc)(struct iowa_bus *, void *), void *data) { - struct spider_pci_bus *bus = &spider_pci_busses[spider_pci_count]; + struct iowa_bus *bus; struct device_node *np = phb->dn; - struct resource rsrc; - void __iomem *regs; - if (spider_pci_count >= MAX_SPIDERS) { - printk(KERN_ERR "Too many spider bridges, workarounds" - " disabled for %s\n", np->full_name); + if (iowa_bus_count >= IOWA_MAX_BUS) { + pr_err("IOWA:Too many pci bridges, " + "workarounds disabled for %s\n", np->full_name); return; } - /* Get the registers for the beast */ - if (of_address_to_resource(np, 0, &rsrc)) { - printk(KERN_ERR "Failed to get registers for spider %s" - " workarounds disabled\n", np->full_name); - return; - } + bus = &iowa_busses[iowa_bus_count]; + bus->phb = phb; + bus->ops = ops; - /* Mask out some useless bits in there to get to the base of the - * spider chip - */ - rsrc.start &= ~0xfffffffful; - - /* Map them */ - regs = ioremap(rsrc.start + SPIDER_PCI_REG_BASE, 0x1000); - if (regs == NULL) { - printk(KERN_ERR "Failed to map registers for spider %s" - " workarounds disabled\n", np->full_name); - return; - } - - spider_pci_count++; - - /* We assume spiders only have one MMIO resource */ - bus->mmio_start = phb->mem_resources[0].start; - bus->mmio_end = phb->mem_resources[0].end + 1; - - bus->pio_vstart = (unsigned long)phb->io_base_virt; - bus->pio_vend = bus->pio_vstart + phb->pci_io_size; - - bus->regs = regs; - - printk(KERN_INFO "PCI: Spider MMIO workaround for %s\n",np->full_name); + if (initfunc) + if ((*initfunc)(bus, data)) + return; - pr_debug(" mmio (P) = 0x%016lx..0x%016lx\n", - bus->mmio_start, bus->mmio_end); - pr_debug(" pio (V) = 0x%016lx..0x%016lx\n", - bus->pio_vstart, bus->pio_vend); - pr_debug(" regs (P) = 0x%016lx (V) = 0x%p\n", - rsrc.start + SPIDER_PCI_REG_BASE, bus->regs); + iowa_bus_count++; - spider_pci_setup_chip(bus); + pr_debug("IOWA:[%d]Add bus, %s.\n", iowa_bus_count-1, np->full_name); } -static struct ppc_pci_io __initdata spider_pci_io = { - .readb = spider_readb, - .readw = spider_readw, - .readl = spider_readl, - .readq = spider_readq, - .readw_be = spider_readw_be, - .readl_be = spider_readl_be, - .readq_be = spider_readq_be, - .readsb = spider_readsb, - .readsw = spider_readsw, - .readsl = spider_readsl, - .memcpy_fromio = spider_memcpy_fromio, -}; - -static int __init spider_pci_workaround_init(void) +/* enable IO workaround */ +void __init io_workaround_init(void) { - struct pci_controller *phb; - - /* Find spider bridges. We assume they have been all probed - * in setup_arch(). If that was to change, we would need to - * update this code to cope with dynamically added busses - */ - list_for_each_entry(phb, &hose_list, list_node) { - struct device_node *np = phb->dn; - const char *model = of_get_property(np, "model", NULL); - - /* If no model property or name isn't exactly "pci", skip */ - if (model == NULL || strcmp(np->name, "pci")) - continue; - /* If model is not "Spider", skip */ - if (strcmp(model, "Spider")) - continue; - spider_pci_add_one(phb); - } - - /* No Spider PCI found, exit */ - if (spider_pci_count == 0) - return 0; + static int io_workaround_inited; - /* Setup IO callbacks. We only setup MMIO reads. PIO reads will - * fallback to MMIO reads (though without a token, thus slower) - */ - ppc_pci_io = spider_pci_io; - - /* Setup ioremap callback */ - ppc_md.ioremap = spider_ioremap; - - return 0; + if (io_workaround_inited) + return; + ppc_pci_io = iowa_pci_io; + ppc_md.ioremap = iowa_ioremap; + io_workaround_inited = 1; } -machine_arch_initcall(cell, spider_pci_workaround_init); diff --git a/arch/powerpc/platforms/cell/io-workarounds.h b/arch/powerpc/platforms/cell/io-workarounds.h new file mode 100644 index 0000000..79d8ed3 --- /dev/null +++ b/arch/powerpc/platforms/cell/io-workarounds.h @@ -0,0 +1,49 @@ +/* + * Support PCI IO workaround + * + * (C) Copyright 2007-2008 TOSHIBA CORPORATION + * + * 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. + */ + +#ifndef _IO_WORKAROUNDS_H +#define _IO_WORKAROUNDS_H + +#include <linux/io.h> +#include <asm/pci-bridge.h> + +/* Bus info */ +struct iowa_bus { + struct pci_controller *phb; + struct ppc_pci_io *ops; + void *private; +}; + +void __init io_workaround_init(void); +void __init iowa_register_bus(struct pci_controller *, struct ppc_pci_io *, + int (*)(struct iowa_bus *, void *), void *); +struct iowa_bus *iowa_mem_find_bus(const PCI_IO_ADDR); +struct iowa_bus *iowa_pio_find_bus(unsigned long); + +extern struct ppc_pci_io spiderpci_ops; +extern int spiderpci_iowa_init(struct iowa_bus *, void *); + +#define SPIDER_PCI_REG_BASE 0xd000 +#define SPIDER_PCI_REG_SIZE 0x1000 +#define SPIDER_PCI_VCI_CNTL_STAT 0x0110 +#define SPIDER_PCI_DUMMY_READ 0x0810 +#define SPIDER_PCI_DUMMY_READ_BASE 0x0814 + +#endif /* _IO_WORKAROUNDS_H */ diff --git a/arch/powerpc/platforms/cell/setup.c b/arch/powerpc/platforms/cell/setup.c index 5c531e8..ab721b5 100644 --- a/arch/powerpc/platforms/cell/setup.c +++ b/arch/powerpc/platforms/cell/setup.c @@ -57,6 +57,7 @@ #include "interrupt.h" #include "pervasive.h" #include "ras.h" +#include "io-workarounds.h" #ifdef DEBUG #define DBG(fmt...) udbg_printf(fmt) @@ -117,13 +118,50 @@ static void cell_fixup_pcie_rootcomplex(struct pci_dev *dev) } DECLARE_PCI_FIXUP_HEADER(PCI_ANY_ID, PCI_ANY_ID, cell_fixup_pcie_rootcomplex); +static int __devinit cell_setup_phb(struct pci_controller *phb) +{ + const char *model; + struct device_node *np; + + int rc = rtas_setup_phb(phb); + if (rc) + return rc; + + np = phb->dn; + model = of_get_property(np, "model", NULL); + if (model == NULL || strcmp(np->name, "pci")) + return 0; + + /* Setup workarounds for spider */ + if (strcmp(model, "Spider")) + return 0; + + iowa_register_bus(phb, &spiderpci_ops, &spiderpci_iowa_init, + (void *)SPIDER_PCI_REG_BASE); + io_workaround_init(); + + return 0; +} + static int __init cell_publish_devices(void) { + struct device_node *root = of_find_node_by_path("/"); + struct device_node *np; int node; /* Publish OF platform devices for southbridge IOs */ of_platform_bus_probe(NULL, NULL, NULL); + /* On spider based blades, we need to manually create the OF + * platform devices for the PCI host bridges + */ + for_each_child_of_node(root, np) { + if (np->type == NULL || (strcmp(np->type, "pci") != 0 && + strcmp(np->type, "pciex") != 0)) + continue; + of_platform_device_create(np, NULL, NULL); + } + /* There is no device for the MIC memory controller, thus we create * a platform device for it to attach the EDAC driver to. */ @@ -132,6 +170,7 @@ static int __init cell_publish_devices(void) continue; platform_device_register_simple("cbe-mic", node, NULL, 0); } + return 0; } machine_subsys_initcall(cell, cell_publish_devices); @@ -213,7 +252,7 @@ static void __init cell_setup_arch(void) /* Find and initialize PCI host bridges */ init_pci_config_tokens(); - find_and_init_phbs(); + cbe_pervasive_init(); #ifdef CONFIG_DUMMY_CONSOLE conswitchp = &dummy_con; @@ -249,7 +288,7 @@ define_machine(cell) { .calibrate_decr = generic_calibrate_decr, .progress = cell_progress, .init_IRQ = cell_init_irq, - .pci_setup_phb = rtas_setup_phb, + .pci_setup_phb = cell_setup_phb, #ifdef CONFIG_KEXEC .machine_kexec = default_machine_kexec, .machine_kexec_prepare = default_machine_kexec_prepare, diff --git a/arch/powerpc/platforms/cell/spider-pci.c b/arch/powerpc/platforms/cell/spider-pci.c new file mode 100644 index 0000000..418b605 --- /dev/null +++ b/arch/powerpc/platforms/cell/spider-pci.c @@ -0,0 +1,184 @@ +/* + * IO workarounds for PCI on Celleb/Cell platform + * + * (C) Copyright 2006-2007 TOSHIBA CORPORATION + * + * 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. + */ + +#undef DEBUG + +#include <linux/kernel.h> +#include <linux/of_platform.h> +#include <linux/io.h> + +#include <asm/ppc-pci.h> +#include <asm/pci-bridge.h> + +#include "io-workarounds.h" + +#define SPIDER_PCI_DISABLE_PREFETCH + +struct spiderpci_iowa_private { + void __iomem *regs; +}; + +static void spiderpci_io_flush(struct iowa_bus *bus) +{ + struct spiderpci_iowa_private *priv; + u32 val; + + priv = bus->private; + val = in_be32(priv->regs + SPIDER_PCI_DUMMY_READ); + iosync(); +} + +#define SPIDER_PCI_MMIO_READ(name, ret) \ +static ret spiderpci_##name(const PCI_IO_ADDR addr) \ +{ \ + ret val = __do_##name(addr); \ + spiderpci_io_flush(iowa_mem_find_bus(addr)); \ + return val; \ +} + +#define SPIDER_PCI_MMIO_READ_STR(name) \ +static void spiderpci_##name(const PCI_IO_ADDR addr, void *buf, \ + unsigned long count) \ +{ \ + __do_##name(addr, buf, count); \ + spiderpci_io_flush(iowa_mem_find_bus(addr)); \ +} + +SPIDER_PCI_MMIO_READ(readb, u8) +SPIDER_PCI_MMIO_READ(readw, u16) +SPIDER_PCI_MMIO_READ(readl, u32) +SPIDER_PCI_MMIO_READ(readq, u64) +SPIDER_PCI_MMIO_READ(readw_be, u16) +SPIDER_PCI_MMIO_READ(readl_be, u32) +SPIDER_PCI_MMIO_READ(readq_be, u64) +SPIDER_PCI_MMIO_READ_STR(readsb) +SPIDER_PCI_MMIO_READ_STR(readsw) +SPIDER_PCI_MMIO_READ_STR(readsl) + +static void spiderpci_memcpy_fromio(void *dest, const PCI_IO_ADDR src, + unsigned long n) +{ + __do_memcpy_fromio(dest, src, n); + spiderpci_io_flush(iowa_mem_find_bus(src)); +} + +static int __init spiderpci_pci_setup_chip(struct pci_controller *phb, + void __iomem *regs) +{ + void *dummy_page_va; + dma_addr_t dummy_page_da; + +#ifdef SPIDER_PCI_DISABLE_PREFETCH + u32 val = in_be32(regs + SPIDER_PCI_VCI_CNTL_STAT); + pr_debug("SPIDER_IOWA:PVCI_Control_Status was 0x%08x\n", val); + out_be32(regs + SPIDER_PCI_VCI_CNTL_STAT, val | 0x8); +#endif /* SPIDER_PCI_DISABLE_PREFETCH */ + + /* setup dummy read */ + /* + * On CellBlade, we can't know that which XDR memory is used by + * kmalloc() to allocate dummy_page_va. + * In order to imporve the performance, the XDR which is used to + * allocate dummy_page_va is the nearest the spider-pci. + * We have to select the CBE which is the nearest the spider-pci + * to allocate memory from the best XDR, but I don't know that + * how to do. + * + * Celleb does not have this problem, because it has only one XDR. + */ + dummy_page_va = kmalloc(PAGE_SIZE, GFP_KERNEL); + if (!dummy_page_va) { + pr_err("SPIDERPCI-IOWA:Alloc dummy_page_va failed.\n"); + return -1; + } + + dummy_page_da = dma_map_single(phb->parent, dummy_page_va, + PAGE_SIZE, DMA_FROM_DEVICE); + if (dma_mapping_error(dummy_page_da)) { + pr_err("SPIDER-IOWA:Map dummy page filed.\n"); + kfree(dummy_page_va); + return -1; + } + + out_be32(regs + SPIDER_PCI_DUMMY_READ_BASE, dummy_page_da); + + return 0; +} + +int __init spiderpci_iowa_init(struct iowa_bus *bus, void *data) +{ + void __iomem *regs = NULL; + struct spiderpci_iowa_private *priv; + struct device_node *np = bus->phb->dn; + struct resource r; + unsigned long offset = (unsigned long)data; + + pr_debug("SPIDERPCI-IOWA:Bus initialize for spider(%s)\n", + np->full_name); + + priv = kzalloc(sizeof(struct spiderpci_iowa_private), GFP_KERNEL); + if (!priv) { + pr_err("SPIDERPCI-IOWA:" + "Can't allocate struct spiderpci_iowa_private"); + return -1; + } + + if (of_address_to_resource(np, 0, &r)) { + pr_err("SPIDERPCI-IOWA:Can't get resource.\n"); + goto error; + } + + regs = ioremap(r.start + offset, SPIDER_PCI_REG_SIZE); + if (!regs) { + pr_err("SPIDERPCI-IOWA:ioremap failed.\n"); + goto error; + } + priv->regs = regs; + bus->private = priv; + + if (spiderpci_pci_setup_chip(bus->phb, regs)) + goto error; + + return 0; + +error: + kfree(priv); + bus->private = NULL; + + if (regs) + iounmap(regs); + + return -1; +} + +struct ppc_pci_io spiderpci_ops = { + .readb = spiderpci_readb, + .readw = spiderpci_readw, + .readl = spiderpci_readl, + .readq = spiderpci_readq, + .readw_be = spiderpci_readw_be, + .readl_be = spiderpci_readl_be, + .readq_be = spiderpci_readq_be, + .readsb = spiderpci_readsb, + .readsw = spiderpci_readsw, + .readsl = spiderpci_readsl, + .memcpy_fromio = spiderpci_memcpy_fromio, +}; + |