1/* 2 * IO workarounds for PCI on Celleb/Cell platform 3 * 4 * (C) Copyright 2006-2007 TOSHIBA CORPORATION 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License along 17 * with this program; if not, write to the Free Software Foundation, Inc., 18 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. 19 */ 20 21#undef DEBUG 22 23#include <linux/kernel.h> 24#include <linux/of_platform.h> 25#include <linux/slab.h> 26#include <linux/io.h> 27 28#include <asm/ppc-pci.h> 29#include <asm/pci-bridge.h> 30 31#include "io-workarounds.h" 32 33#define SPIDER_PCI_DISABLE_PREFETCH 34 35struct spiderpci_iowa_private { 36 void __iomem *regs; 37}; 38 39static void spiderpci_io_flush(struct iowa_bus *bus) 40{ 41 struct spiderpci_iowa_private *priv; 42 u32 val; 43 44 priv = bus->private; 45 val = in_be32(priv->regs + SPIDER_PCI_DUMMY_READ); 46 iosync(); 47} 48 49#define SPIDER_PCI_MMIO_READ(name, ret) \ 50static ret spiderpci_##name(const PCI_IO_ADDR addr) \ 51{ \ 52 ret val = __do_##name(addr); \ 53 spiderpci_io_flush(iowa_mem_find_bus(addr)); \ 54 return val; \ 55} 56 57#define SPIDER_PCI_MMIO_READ_STR(name) \ 58static void spiderpci_##name(const PCI_IO_ADDR addr, void *buf, \ 59 unsigned long count) \ 60{ \ 61 __do_##name(addr, buf, count); \ 62 spiderpci_io_flush(iowa_mem_find_bus(addr)); \ 63} 64 65SPIDER_PCI_MMIO_READ(readb, u8) 66SPIDER_PCI_MMIO_READ(readw, u16) 67SPIDER_PCI_MMIO_READ(readl, u32) 68SPIDER_PCI_MMIO_READ(readq, u64) 69SPIDER_PCI_MMIO_READ(readw_be, u16) 70SPIDER_PCI_MMIO_READ(readl_be, u32) 71SPIDER_PCI_MMIO_READ(readq_be, u64) 72SPIDER_PCI_MMIO_READ_STR(readsb) 73SPIDER_PCI_MMIO_READ_STR(readsw) 74SPIDER_PCI_MMIO_READ_STR(readsl) 75 76static void spiderpci_memcpy_fromio(void *dest, const PCI_IO_ADDR src, 77 unsigned long n) 78{ 79 __do_memcpy_fromio(dest, src, n); 80 spiderpci_io_flush(iowa_mem_find_bus(src)); 81} 82 83static int __init spiderpci_pci_setup_chip(struct pci_controller *phb, 84 void __iomem *regs) 85{ 86 void *dummy_page_va; 87 dma_addr_t dummy_page_da; 88 89#ifdef SPIDER_PCI_DISABLE_PREFETCH 90 u32 val = in_be32(regs + SPIDER_PCI_VCI_CNTL_STAT); 91 pr_debug("SPIDER_IOWA:PVCI_Control_Status was 0x%08x\n", val); 92 out_be32(regs + SPIDER_PCI_VCI_CNTL_STAT, val | 0x8); 93#endif /* SPIDER_PCI_DISABLE_PREFETCH */ 94 95 /* setup dummy read */ 96 /* 97 * On CellBlade, we can't know that which XDR memory is used by 98 * kmalloc() to allocate dummy_page_va. 99 * In order to imporve the performance, the XDR which is used to 100 * allocate dummy_page_va is the nearest the spider-pci. 101 * We have to select the CBE which is the nearest the spider-pci 102 * to allocate memory from the best XDR, but I don't know that 103 * how to do. 104 * 105 * Celleb does not have this problem, because it has only one XDR. 106 */ 107 dummy_page_va = kmalloc(PAGE_SIZE, GFP_KERNEL); 108 if (!dummy_page_va) { 109 pr_err("SPIDERPCI-IOWA:Alloc dummy_page_va failed.\n"); 110 return -1; 111 } 112 113 dummy_page_da = dma_map_single(phb->parent, dummy_page_va, 114 PAGE_SIZE, DMA_FROM_DEVICE); 115 if (dma_mapping_error(phb->parent, dummy_page_da)) { 116 pr_err("SPIDER-IOWA:Map dummy page filed.\n"); 117 kfree(dummy_page_va); 118 return -1; 119 } 120 121 out_be32(regs + SPIDER_PCI_DUMMY_READ_BASE, dummy_page_da); 122 123 return 0; 124} 125 126int __init spiderpci_iowa_init(struct iowa_bus *bus, void *data) 127{ 128 void __iomem *regs = NULL; 129 struct spiderpci_iowa_private *priv; 130 struct device_node *np = bus->phb->dn; 131 struct resource r; 132 unsigned long offset = (unsigned long)data; 133 134 pr_debug("SPIDERPCI-IOWA:Bus initialize for spider(%s)\n", 135 np->full_name); 136 137 priv = kzalloc(sizeof(struct spiderpci_iowa_private), GFP_KERNEL); 138 if (!priv) { 139 pr_err("SPIDERPCI-IOWA:" 140 "Can't allocate struct spiderpci_iowa_private"); 141 return -1; 142 } 143 144 if (of_address_to_resource(np, 0, &r)) { 145 pr_err("SPIDERPCI-IOWA:Can't get resource.\n"); 146 goto error; 147 } 148 149 regs = ioremap(r.start + offset, SPIDER_PCI_REG_SIZE); 150 if (!regs) { 151 pr_err("SPIDERPCI-IOWA:ioremap failed.\n"); 152 goto error; 153 } 154 priv->regs = regs; 155 bus->private = priv; 156 157 if (spiderpci_pci_setup_chip(bus->phb, regs)) 158 goto error; 159 160 return 0; 161 162error: 163 kfree(priv); 164 bus->private = NULL; 165 166 if (regs) 167 iounmap(regs); 168 169 return -1; 170} 171 172struct ppc_pci_io spiderpci_ops = { 173 .readb = spiderpci_readb, 174 .readw = spiderpci_readw, 175 .readl = spiderpci_readl, 176 .readq = spiderpci_readq, 177 .readw_be = spiderpci_readw_be, 178 .readl_be = spiderpci_readl_be, 179 .readq_be = spiderpci_readq_be, 180 .readsb = spiderpci_readsb, 181 .readsw = spiderpci_readsw, 182 .readsl = spiderpci_readsl, 183 .memcpy_fromio = spiderpci_memcpy_fromio, 184}; 185