1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * IO workarounds for PCI on Celleb/Cell platform 4 * 5 * (C) Copyright 2006-2007 TOSHIBA CORPORATION 6 */ 7 8 #undef DEBUG 9 10 #include <linux/kernel.h> 11 #include <linux/of_platform.h> 12 #include <linux/slab.h> 13 #include <linux/io.h> 14 15 #include <asm/ppc-pci.h> 16 #include <asm/pci-bridge.h> 17 #include <asm/io-workarounds.h> 18 19 #define SPIDER_PCI_DISABLE_PREFETCH 20 21 struct spiderpci_iowa_private { 22 void __iomem *regs; 23 }; 24 25 static void spiderpci_io_flush(struct iowa_bus *bus) 26 { 27 struct spiderpci_iowa_private *priv; 28 29 priv = bus->private; 30 in_be32(priv->regs + SPIDER_PCI_DUMMY_READ); 31 iosync(); 32 } 33 34 #define SPIDER_PCI_MMIO_READ(name, ret) \ 35 static ret spiderpci_##name(const PCI_IO_ADDR addr) \ 36 { \ 37 ret val = __do_##name(addr); \ 38 spiderpci_io_flush(iowa_mem_find_bus(addr)); \ 39 return val; \ 40 } 41 42 #define SPIDER_PCI_MMIO_READ_STR(name) \ 43 static void spiderpci_##name(const PCI_IO_ADDR addr, void *buf, \ 44 unsigned long count) \ 45 { \ 46 __do_##name(addr, buf, count); \ 47 spiderpci_io_flush(iowa_mem_find_bus(addr)); \ 48 } 49 50 SPIDER_PCI_MMIO_READ(readb, u8) 51 SPIDER_PCI_MMIO_READ(readw, u16) 52 SPIDER_PCI_MMIO_READ(readl, u32) 53 SPIDER_PCI_MMIO_READ(readq, u64) 54 SPIDER_PCI_MMIO_READ(readw_be, u16) 55 SPIDER_PCI_MMIO_READ(readl_be, u32) 56 SPIDER_PCI_MMIO_READ(readq_be, u64) 57 SPIDER_PCI_MMIO_READ_STR(readsb) 58 SPIDER_PCI_MMIO_READ_STR(readsw) 59 SPIDER_PCI_MMIO_READ_STR(readsl) 60 61 static void spiderpci_memcpy_fromio(void *dest, const PCI_IO_ADDR src, 62 unsigned long n) 63 { 64 __do_memcpy_fromio(dest, src, n); 65 spiderpci_io_flush(iowa_mem_find_bus(src)); 66 } 67 68 static int __init spiderpci_pci_setup_chip(struct pci_controller *phb, 69 void __iomem *regs) 70 { 71 void *dummy_page_va; 72 dma_addr_t dummy_page_da; 73 74 #ifdef SPIDER_PCI_DISABLE_PREFETCH 75 u32 val = in_be32(regs + SPIDER_PCI_VCI_CNTL_STAT); 76 pr_debug("SPIDER_IOWA:PVCI_Control_Status was 0x%08x\n", val); 77 out_be32(regs + SPIDER_PCI_VCI_CNTL_STAT, val | 0x8); 78 #endif /* SPIDER_PCI_DISABLE_PREFETCH */ 79 80 /* setup dummy read */ 81 /* 82 * On CellBlade, we can't know that which XDR memory is used by 83 * kmalloc() to allocate dummy_page_va. 84 * In order to imporve the performance, the XDR which is used to 85 * allocate dummy_page_va is the nearest the spider-pci. 86 * We have to select the CBE which is the nearest the spider-pci 87 * to allocate memory from the best XDR, but I don't know that 88 * how to do. 89 * 90 * Celleb does not have this problem, because it has only one XDR. 91 */ 92 dummy_page_va = kmalloc(PAGE_SIZE, GFP_KERNEL); 93 if (!dummy_page_va) { 94 pr_err("SPIDERPCI-IOWA:Alloc dummy_page_va failed.\n"); 95 return -1; 96 } 97 98 dummy_page_da = dma_map_single(phb->parent, dummy_page_va, 99 PAGE_SIZE, DMA_FROM_DEVICE); 100 if (dma_mapping_error(phb->parent, dummy_page_da)) { 101 pr_err("SPIDER-IOWA:Map dummy page filed.\n"); 102 kfree(dummy_page_va); 103 return -1; 104 } 105 106 out_be32(regs + SPIDER_PCI_DUMMY_READ_BASE, dummy_page_da); 107 108 return 0; 109 } 110 111 int __init spiderpci_iowa_init(struct iowa_bus *bus, void *data) 112 { 113 void __iomem *regs = NULL; 114 struct spiderpci_iowa_private *priv; 115 struct device_node *np = bus->phb->dn; 116 struct resource r; 117 unsigned long offset = (unsigned long)data; 118 119 pr_debug("SPIDERPCI-IOWA:Bus initialize for spider(%pOF)\n", 120 np); 121 122 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 123 if (!priv) { 124 pr_err("SPIDERPCI-IOWA:" 125 "Can't allocate struct spiderpci_iowa_private"); 126 return -1; 127 } 128 129 if (of_address_to_resource(np, 0, &r)) { 130 pr_err("SPIDERPCI-IOWA:Can't get resource.\n"); 131 goto error; 132 } 133 134 regs = ioremap(r.start + offset, SPIDER_PCI_REG_SIZE); 135 if (!regs) { 136 pr_err("SPIDERPCI-IOWA:ioremap failed.\n"); 137 goto error; 138 } 139 priv->regs = regs; 140 bus->private = priv; 141 142 if (spiderpci_pci_setup_chip(bus->phb, regs)) 143 goto error; 144 145 return 0; 146 147 error: 148 kfree(priv); 149 bus->private = NULL; 150 151 if (regs) 152 iounmap(regs); 153 154 return -1; 155 } 156 157 struct ppc_pci_io spiderpci_ops = { 158 .readb = spiderpci_readb, 159 .readw = spiderpci_readw, 160 .readl = spiderpci_readl, 161 .readq = spiderpci_readq, 162 .readw_be = spiderpci_readw_be, 163 .readl_be = spiderpci_readl_be, 164 .readq_be = spiderpci_readq_be, 165 .readsb = spiderpci_readsb, 166 .readsw = spiderpci_readsw, 167 .readsl = spiderpci_readsl, 168 .memcpy_fromio = spiderpci_memcpy_fromio, 169 }; 170 171