--- /dev/null
+/*
+ * IO workarounds for PCI on Celleb/Cell platform
+ *
+ * (C) Copyright 2006-2007 TOSHIBA CORPORATION
+ *
+ * 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/kernel.h>
+#include <linux/of_platform.h>
+#include <linux/slab.h>
+#include <linux/io.h>
+
+#include <asm/ppc-pci.h>
+#include <asm/pci-bridge.h>
+#include <asm/io-workarounds.h>
+
+#define SPIDER_PCI_DISABLE_PREFETCH
+
+struct spiderpci_iowa_private {
+ void __iomem *regs;
+};
+
+static void spiderpci_io_flush(struct iowa_bus *bus)
+{
+ struct spiderpci_iowa_private *priv;
+ u32 val;
+
+ priv = bus->private;
+ val = in_be32(priv->regs + SPIDER_PCI_DUMMY_READ);
+ iosync();
+}
+
+#define SPIDER_PCI_MMIO_READ(name, ret) \
+static ret spiderpci_##name(const PCI_IO_ADDR addr) \
+{ \
+ ret val = __do_##name(addr); \
+ spiderpci_io_flush(iowa_mem_find_bus(addr)); \
+ return val; \
+}
+
+#define SPIDER_PCI_MMIO_READ_STR(name) \
+static void spiderpci_##name(const PCI_IO_ADDR addr, void *buf, \
+ unsigned long count) \
+{ \
+ __do_##name(addr, buf, count); \
+ spiderpci_io_flush(iowa_mem_find_bus(addr)); \
+}
+
+SPIDER_PCI_MMIO_READ(readb, u8)
+SPIDER_PCI_MMIO_READ(readw, u16)
+SPIDER_PCI_MMIO_READ(readl, u32)
+SPIDER_PCI_MMIO_READ(readq, u64)
+SPIDER_PCI_MMIO_READ(readw_be, u16)
+SPIDER_PCI_MMIO_READ(readl_be, u32)
+SPIDER_PCI_MMIO_READ(readq_be, u64)
+SPIDER_PCI_MMIO_READ_STR(readsb)
+SPIDER_PCI_MMIO_READ_STR(readsw)
+SPIDER_PCI_MMIO_READ_STR(readsl)
+
+static void spiderpci_memcpy_fromio(void *dest, const PCI_IO_ADDR src,
+ unsigned long n)
+{
+ __do_memcpy_fromio(dest, src, n);
+ spiderpci_io_flush(iowa_mem_find_bus(src));
+}
+
+static int __init spiderpci_pci_setup_chip(struct pci_controller *phb,
+ void __iomem *regs)
+{
+ void *dummy_page_va;
+ dma_addr_t dummy_page_da;
+
+#ifdef SPIDER_PCI_DISABLE_PREFETCH
+ u32 val = in_be32(regs + SPIDER_PCI_VCI_CNTL_STAT);
+ pr_debug("SPIDER_IOWA:PVCI_Control_Status was 0x%08x\n", val);
+ out_be32(regs + SPIDER_PCI_VCI_CNTL_STAT, val | 0x8);
+#endif /* SPIDER_PCI_DISABLE_PREFETCH */
+
+ /* setup dummy read */
+ /*
+ * On CellBlade, we can't know that which XDR memory is used by
+ * kmalloc() to allocate dummy_page_va.
+ * In order to imporve the performance, the XDR which is used to
+ * allocate dummy_page_va is the nearest the spider-pci.
+ * We have to select the CBE which is the nearest the spider-pci
+ * to allocate memory from the best XDR, but I don't know that
+ * how to do.
+ *
+ * Celleb does not have this problem, because it has only one XDR.
+ */
+ dummy_page_va = kmalloc(PAGE_SIZE, GFP_KERNEL);
+ if (!dummy_page_va) {
+ pr_err("SPIDERPCI-IOWA:Alloc dummy_page_va failed.\n");
+ return -1;
+ }
+
+ dummy_page_da = dma_map_single(phb->parent, dummy_page_va,
+ PAGE_SIZE, DMA_FROM_DEVICE);
+ if (dma_mapping_error(phb->parent, dummy_page_da)) {
+ pr_err("SPIDER-IOWA:Map dummy page filed.\n");
+ kfree(dummy_page_va);
+ return -1;
+ }
+
+ out_be32(regs + SPIDER_PCI_DUMMY_READ_BASE, dummy_page_da);
+
+ return 0;
+}
+
+int __init spiderpci_iowa_init(struct iowa_bus *bus, void *data)
+{
+ void __iomem *regs = NULL;
+ struct spiderpci_iowa_private *priv;
+ struct device_node *np = bus->phb->dn;
+ struct resource r;
+ unsigned long offset = (unsigned long)data;
+
+ pr_debug("SPIDERPCI-IOWA:Bus initialize for spider(%s)\n",
+ np->full_name);
+
+ priv = kzalloc(sizeof(struct spiderpci_iowa_private), GFP_KERNEL);
+ if (!priv) {
+ pr_err("SPIDERPCI-IOWA:"
+ "Can't allocate struct spiderpci_iowa_private");
+ return -1;
+ }
+
+ if (of_address_to_resource(np, 0, &r)) {
+ pr_err("SPIDERPCI-IOWA:Can't get resource.\n");
+ goto error;
+ }
+
+ regs = ioremap(r.start + offset, SPIDER_PCI_REG_SIZE);
+ if (!regs) {
+ pr_err("SPIDERPCI-IOWA:ioremap failed.\n");
+ goto error;
+ }
+ priv->regs = regs;
+ bus->private = priv;
+
+ if (spiderpci_pci_setup_chip(bus->phb, regs))
+ goto error;
+
+ return 0;
+
+error:
+ kfree(priv);
+ bus->private = NULL;
+
+ if (regs)
+ iounmap(regs);
+
+ return -1;
+}
+
+struct ppc_pci_io spiderpci_ops = {
+ .readb = spiderpci_readb,
+ .readw = spiderpci_readw,
+ .readl = spiderpci_readl,
+ .readq = spiderpci_readq,
+ .readw_be = spiderpci_readw_be,
+ .readl_be = spiderpci_readl_be,
+ .readq_be = spiderpci_readq_be,
+ .readsb = spiderpci_readsb,
+ .readsw = spiderpci_readsw,
+ .readsl = spiderpci_readsl,
+ .memcpy_fromio = spiderpci_memcpy_fromio,
+};
+
Code Review / kvmfornfv.git / blobdiff