1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * IO workarounds for PCI on Celleb/Cell platform
5 * (C) Copyright 2006-2007 TOSHIBA CORPORATION
10 #include <linux/kernel.h>
11 #include <linux/of_platform.h>
12 #include <linux/slab.h>
15 #include <asm/ppc-pci.h>
16 #include <asm/pci-bridge.h>
17 #include <asm/io-workarounds.h>
19 #define SPIDER_PCI_DISABLE_PREFETCH
21 struct spiderpci_iowa_private {
25 static void spiderpci_io_flush(struct iowa_bus *bus)
27 struct spiderpci_iowa_private *priv;
31 val = in_be32(priv->regs + SPIDER_PCI_DUMMY_READ);
35 #define SPIDER_PCI_MMIO_READ(name, ret) \
36 static ret spiderpci_##name(const PCI_IO_ADDR addr) \
38 ret val = __do_##name(addr); \
39 spiderpci_io_flush(iowa_mem_find_bus(addr)); \
43 #define SPIDER_PCI_MMIO_READ_STR(name) \
44 static void spiderpci_##name(const PCI_IO_ADDR addr, void *buf, \
45 unsigned long count) \
47 __do_##name(addr, buf, count); \
48 spiderpci_io_flush(iowa_mem_find_bus(addr)); \
51 SPIDER_PCI_MMIO_READ(readb, u8)
52 SPIDER_PCI_MMIO_READ(readw, u16)
53 SPIDER_PCI_MMIO_READ(readl, u32)
54 SPIDER_PCI_MMIO_READ(readq, u64)
55 SPIDER_PCI_MMIO_READ(readw_be, u16)
56 SPIDER_PCI_MMIO_READ(readl_be, u32)
57 SPIDER_PCI_MMIO_READ(readq_be, u64)
58 SPIDER_PCI_MMIO_READ_STR(readsb)
59 SPIDER_PCI_MMIO_READ_STR(readsw)
60 SPIDER_PCI_MMIO_READ_STR(readsl)
62 static void spiderpci_memcpy_fromio(void *dest, const PCI_IO_ADDR src,
65 __do_memcpy_fromio(dest, src, n);
66 spiderpci_io_flush(iowa_mem_find_bus(src));
69 static int __init spiderpci_pci_setup_chip(struct pci_controller *phb,
73 dma_addr_t dummy_page_da;
75 #ifdef SPIDER_PCI_DISABLE_PREFETCH
76 u32 val = in_be32(regs + SPIDER_PCI_VCI_CNTL_STAT);
77 pr_debug("SPIDER_IOWA:PVCI_Control_Status was 0x%08x\n", val);
78 out_be32(regs + SPIDER_PCI_VCI_CNTL_STAT, val | 0x8);
79 #endif /* SPIDER_PCI_DISABLE_PREFETCH */
81 /* setup dummy read */
83 * On CellBlade, we can't know that which XDR memory is used by
84 * kmalloc() to allocate dummy_page_va.
85 * In order to imporve the performance, the XDR which is used to
86 * allocate dummy_page_va is the nearest the spider-pci.
87 * We have to select the CBE which is the nearest the spider-pci
88 * to allocate memory from the best XDR, but I don't know that
91 * Celleb does not have this problem, because it has only one XDR.
93 dummy_page_va = kmalloc(PAGE_SIZE, GFP_KERNEL);
95 pr_err("SPIDERPCI-IOWA:Alloc dummy_page_va failed.\n");
99 dummy_page_da = dma_map_single(phb->parent, dummy_page_va,
100 PAGE_SIZE, DMA_FROM_DEVICE);
101 if (dma_mapping_error(phb->parent, dummy_page_da)) {
102 pr_err("SPIDER-IOWA:Map dummy page filed.\n");
103 kfree(dummy_page_va);
107 out_be32(regs + SPIDER_PCI_DUMMY_READ_BASE, dummy_page_da);
112 int __init spiderpci_iowa_init(struct iowa_bus *bus, void *data)
114 void __iomem *regs = NULL;
115 struct spiderpci_iowa_private *priv;
116 struct device_node *np = bus->phb->dn;
118 unsigned long offset = (unsigned long)data;
120 pr_debug("SPIDERPCI-IOWA:Bus initialize for spider(%pOF)\n",
123 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
125 pr_err("SPIDERPCI-IOWA:"
126 "Can't allocate struct spiderpci_iowa_private");
130 if (of_address_to_resource(np, 0, &r)) {
131 pr_err("SPIDERPCI-IOWA:Can't get resource.\n");
135 regs = ioremap(r.start + offset, SPIDER_PCI_REG_SIZE);
137 pr_err("SPIDERPCI-IOWA:ioremap failed.\n");
143 if (spiderpci_pci_setup_chip(bus->phb, regs))
158 struct ppc_pci_io spiderpci_ops = {
159 .readb = spiderpci_readb,
160 .readw = spiderpci_readw,
161 .readl = spiderpci_readl,
162 .readq = spiderpci_readq,
163 .readw_be = spiderpci_readw_be,
164 .readl_be = spiderpci_readl_be,
165 .readq_be = spiderpci_readq_be,
166 .readsb = spiderpci_readsb,
167 .readsw = spiderpci_readsw,
168 .readsl = spiderpci_readsl,
169 .memcpy_fromio = spiderpci_memcpy_fromio,