diff options
Diffstat (limited to 'arch/powerpc/platforms/celleb/io-workarounds.c')
| -rw-r--r-- | arch/powerpc/platforms/celleb/io-workarounds.c | 279 |
1 files changed, 279 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/celleb/io-workarounds.c b/arch/powerpc/platforms/celleb/io-workarounds.c new file mode 100644 index 00000000000..2b912140bcb --- /dev/null +++ b/arch/powerpc/platforms/celleb/io-workarounds.c @@ -0,0 +1,279 @@ +/* + * Support for Celleb io workarounds + * + * (C) Copyright 2006-2007 TOSHIBA CORPORATION + * + * This file is based to arch/powerpc/platform/cell/io-workarounds.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., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + */ + +#undef DEBUG + +#include <linux/of_device.h> +#include <linux/irq.h> + +#include <asm/io.h> +#include <asm/prom.h> +#include <asm/machdep.h> +#include <asm/pci-bridge.h> +#include <asm/ppc-pci.h> + +#include "pci.h" + +#define MAX_CELLEB_PCI_BUS 4 + +void *celleb_dummy_page_va; + +static struct celleb_pci_bus { + struct pci_controller *phb; + void (*dummy_read)(struct pci_controller *); +} celleb_pci_busses[MAX_CELLEB_PCI_BUS]; + +static int celleb_pci_count = 0; + +static struct celleb_pci_bus *celleb_pci_find(unsigned long vaddr, + unsigned long paddr) +{ + int i, j; + struct resource *res; + + for (i = 0; i < celleb_pci_count; i++) { + struct celleb_pci_bus *bus = &celleb_pci_busses[i]; + struct pci_controller *phb = bus->phb; + if (paddr) + for (j = 0; j < 3; j++) { + res = &phb->mem_resources[j]; + if (paddr >= res->start && paddr <= res->end) + return bus; + } + res = &phb->io_resource; + if (vaddr && vaddr >= res->start && vaddr <= res->end) + return bus; + } + return NULL; +} + +static void celleb_io_flush(const PCI_IO_ADDR addr) +{ + struct celleb_pci_bus *bus; + int token; + + token = PCI_GET_ADDR_TOKEN(addr); + + if (token && token <= celleb_pci_count) + bus = &celleb_pci_busses[token - 1]; + else { + unsigned long vaddr, paddr; + pte_t *ptep; + + vaddr = (unsigned long)PCI_FIX_ADDR(addr); + if (vaddr < PHB_IO_BASE || vaddr >= PHB_IO_END) + return; + + ptep = find_linux_pte(init_mm.pgd, vaddr); + if (ptep == NULL) + paddr = 0; + else + paddr = pte_pfn(*ptep) << PAGE_SHIFT; + bus = celleb_pci_find(vaddr, paddr); + + if (bus == NULL) + return; + } + + if (bus->dummy_read) + bus->dummy_read(bus->phb); +} + +static u8 celleb_readb(const PCI_IO_ADDR addr) +{ + u8 val; + val = __do_readb(addr); + celleb_io_flush(addr); + return val; +} + +static u16 celleb_readw(const PCI_IO_ADDR addr) +{ + u16 val; + val = __do_readw(addr); + celleb_io_flush(addr); + return val; +} + +static u32 celleb_readl(const PCI_IO_ADDR addr) +{ + u32 val; + val = __do_readl(addr); + celleb_io_flush(addr); + return val; +} + +static u64 celleb_readq(const PCI_IO_ADDR addr) +{ + u64 val; + val = __do_readq(addr); + celleb_io_flush(addr); + return val; +} + +static u16 celleb_readw_be(const PCI_IO_ADDR addr) +{ + u16 val; + val = __do_readw_be(addr); + celleb_io_flush(addr); + return val; +} + +static u32 celleb_readl_be(const PCI_IO_ADDR addr) +{ + u32 val; + val = __do_readl_be(addr); + celleb_io_flush(addr); + return val; +} + +static u64 celleb_readq_be(const PCI_IO_ADDR addr) +{ + u64 val; + val = __do_readq_be(addr); + celleb_io_flush(addr); + return val; +} + +static void celleb_readsb(const PCI_IO_ADDR addr, + void *buf, unsigned long count) +{ + __do_readsb(addr, buf, count); + celleb_io_flush(addr); +} + +static void celleb_readsw(const PCI_IO_ADDR addr, + void *buf, unsigned long count) +{ + __do_readsw(addr, buf, count); + celleb_io_flush(addr); +} + +static void celleb_readsl(const PCI_IO_ADDR addr, + void *buf, unsigned long count) +{ + __do_readsl(addr, buf, count); + celleb_io_flush(addr); +} + +static void celleb_memcpy_fromio(void *dest, + const PCI_IO_ADDR src, + unsigned long n) +{ + __do_memcpy_fromio(dest, src, n); + celleb_io_flush(src); +} + +static void __iomem *celleb_ioremap(unsigned long addr, + unsigned long size, + unsigned long flags) +{ + struct celleb_pci_bus *bus; + void __iomem *res = __ioremap(addr, size, flags); + int busno; + + bus = celleb_pci_find(0, addr); + if (bus != NULL) { + busno = bus - celleb_pci_busses; + PCI_SET_ADDR_TOKEN(res, busno + 1); + } + return res; +} + +static void celleb_iounmap(volatile void __iomem *addr) +{ + return __iounmap(PCI_FIX_ADDR(addr)); +} + +static struct ppc_pci_io celleb_pci_io __initdata = { + .readb = celleb_readb, + .readw = celleb_readw, + .readl = celleb_readl, + .readq = celleb_readq, + .readw_be = celleb_readw_be, + .readl_be = celleb_readl_be, + .readq_be = celleb_readq_be, + .readsb = celleb_readsb, + .readsw = celleb_readsw, + .readsl = celleb_readsl, + .memcpy_fromio = celleb_memcpy_fromio, +}; + +void __init celleb_pci_add_one(struct pci_controller *phb, + void (*dummy_read)(struct pci_controller *)) +{ + struct celleb_pci_bus *bus = &celleb_pci_busses[celleb_pci_count]; + struct device_node *np = phb->arch_data; + + if (celleb_pci_count >= MAX_CELLEB_PCI_BUS) { + printk(KERN_ERR "Too many pci bridges, workarounds" + " disabled for %s\n", np->full_name); + return; + } + + celleb_pci_count++; + + bus->phb = phb; + bus->dummy_read = dummy_read; +} + +static struct of_device_id celleb_pci_workaround_match[] __initdata = { + { + .name = "pci-pseudo", + .data = fake_pci_workaround_init, + }, { + .name = "epci", + .data = epci_workaround_init, + }, { + }, +}; + +int __init celleb_pci_workaround_init(void) +{ + struct pci_controller *phb; + struct device_node *node; + const struct of_device_id *match; + void (*init_func)(struct pci_controller *); + + celleb_dummy_page_va = kmalloc(PAGE_SIZE, GFP_KERNEL); + if (!celleb_dummy_page_va) { + printk(KERN_ERR "Celleb: dummy read disabled." + "Alloc celleb_dummy_page_va failed\n"); + return 1; + } + + list_for_each_entry(phb, &hose_list, list_node) { + node = phb->arch_data; + match = of_match_node(celleb_pci_workaround_match, node); + + if (match) { + init_func = match->data; + (*init_func)(phb); + } + } + + ppc_pci_io = celleb_pci_io; + ppc_md.ioremap = celleb_ioremap; + ppc_md.iounmap = celleb_iounmap; + + return 0; +} |