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 #include <asm/io-workarounds.h> 31 32 #define SPIDER_PCI_DISABLE_PREFETCH 33 34 struct spiderpci_iowa_private { 35 void __iomem *regs; 36 }; 37 38 static void spiderpci_io_flush(struct iowa_bus *bus) 39 { 40 struct spiderpci_iowa_private *priv; 41 u32 val; 42 43 priv = bus->private; 44 val = in_be32(priv->regs + SPIDER_PCI_DUMMY_READ); 45 iosync(); 46 } 47 48 #define SPIDER_PCI_MMIO_READ(name, ret) \ 49 static ret spiderpci_##name(const PCI_IO_ADDR addr) \ 50 { \ 51 ret val = __do_##name(addr); \ 52 spiderpci_io_flush(iowa_mem_find_bus(addr)); \ 53 return val; \ 54 } 55 56 #define SPIDER_PCI_MMIO_READ_STR(name) \ 57 static void spiderpci_##name(const PCI_IO_ADDR addr, void *buf, \ 58 unsigned long count) \ 59 { \ 60 __do_##name(addr, buf, count); \ 61 spiderpci_io_flush(iowa_mem_find_bus(addr)); \ 62 } 63 64 SPIDER_PCI_MMIO_READ(readb, u8) 65 SPIDER_PCI_MMIO_READ(readw, u16) 66 SPIDER_PCI_MMIO_READ(readl, u32) 67 SPIDER_PCI_MMIO_READ(readq, u64) 68 SPIDER_PCI_MMIO_READ(readw_be, u16) 69 SPIDER_PCI_MMIO_READ(readl_be, u32) 70 SPIDER_PCI_MMIO_READ(readq_be, u64) 71 SPIDER_PCI_MMIO_READ_STR(readsb) 72 SPIDER_PCI_MMIO_READ_STR(readsw) 73 SPIDER_PCI_MMIO_READ_STR(readsl) 74 75 static void spiderpci_memcpy_fromio(void *dest, const PCI_IO_ADDR src, 76 unsigned long n) 77 { 78 __do_memcpy_fromio(dest, src, n); 79 spiderpci_io_flush(iowa_mem_find_bus(src)); 80 } 81 82 static int __init spiderpci_pci_setup_chip(struct pci_controller *phb, 83 void __iomem *regs) 84 { 85 void *dummy_page_va; 86 dma_addr_t dummy_page_da; 87 88 #ifdef SPIDER_PCI_DISABLE_PREFETCH 89 u32 val = in_be32(regs + SPIDER_PCI_VCI_CNTL_STAT); 90 pr_debug("SPIDER_IOWA:PVCI_Control_Status was 0x%08x\n", val); 91 out_be32(regs + SPIDER_PCI_VCI_CNTL_STAT, val | 0x8); 92 #endif /* SPIDER_PCI_DISABLE_PREFETCH */ 93 94 /* setup dummy read */ 95 /* 96 * On CellBlade, we can't know that which XDR memory is used by 97 * kmalloc() to allocate dummy_page_va. 98 * In order to imporve the performance, the XDR which is used to 99 * allocate dummy_page_va is the nearest the spider-pci. 100 * We have to select the CBE which is the nearest the spider-pci 101 * to allocate memory from the best XDR, but I don't know that 102 * how to do. 103 * 104 * Celleb does not have this problem, because it has only one XDR. 105 */ 106 dummy_page_va = kmalloc(PAGE_SIZE, GFP_KERNEL); 107 if (!dummy_page_va) { 108 pr_err("SPIDERPCI-IOWA:Alloc dummy_page_va failed.\n"); 109 return -1; 110 } 111 112 dummy_page_da = dma_map_single(phb->parent, dummy_page_va, 113 PAGE_SIZE, DMA_FROM_DEVICE); 114 if (dma_mapping_error(phb->parent, dummy_page_da)) { 115 pr_err("SPIDER-IOWA:Map dummy page filed.\n"); 116 kfree(dummy_page_va); 117 return -1; 118 } 119 120 out_be32(regs + SPIDER_PCI_DUMMY_READ_BASE, dummy_page_da); 121 122 return 0; 123 } 124 125 int __init spiderpci_iowa_init(struct iowa_bus *bus, void *data) 126 { 127 void __iomem *regs = NULL; 128 struct spiderpci_iowa_private *priv; 129 struct device_node *np = bus->phb->dn; 130 struct resource r; 131 unsigned long offset = (unsigned long)data; 132 133 pr_debug("SPIDERPCI-IOWA:Bus initialize for spider(%pOF)\n", 134 np); 135 136 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 137 if (!priv) { 138 pr_err("SPIDERPCI-IOWA:" 139 "Can't allocate struct spiderpci_iowa_private"); 140 return -1; 141 } 142 143 if (of_address_to_resource(np, 0, &r)) { 144 pr_err("SPIDERPCI-IOWA:Can't get resource.\n"); 145 goto error; 146 } 147 148 regs = ioremap(r.start + offset, SPIDER_PCI_REG_SIZE); 149 if (!regs) { 150 pr_err("SPIDERPCI-IOWA:ioremap failed.\n"); 151 goto error; 152 } 153 priv->regs = regs; 154 bus->private = priv; 155 156 if (spiderpci_pci_setup_chip(bus->phb, regs)) 157 goto error; 158 159 return 0; 160 161 error: 162 kfree(priv); 163 bus->private = NULL; 164 165 if (regs) 166 iounmap(regs); 167 168 return -1; 169 } 170 171 struct ppc_pci_io spiderpci_ops = { 172 .readb = spiderpci_readb, 173 .readw = spiderpci_readw, 174 .readl = spiderpci_readl, 175 .readq = spiderpci_readq, 176 .readw_be = spiderpci_readw_be, 177 .readl_be = spiderpci_readl_be, 178 .readq_be = spiderpci_readq_be, 179 .readsb = spiderpci_readsb, 180 .readsw = spiderpci_readsw, 181 .readsl = spiderpci_readsl, 182 .memcpy_fromio = spiderpci_memcpy_fromio, 183 }; 184 185