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-rw-r--r--arch/frv/mb93090-mb00/pci-vdk.c467
1 files changed, 467 insertions, 0 deletions
diff --git a/arch/frv/mb93090-mb00/pci-vdk.c b/arch/frv/mb93090-mb00/pci-vdk.c
new file mode 100644
index 00000000000..c8817f7b860
--- /dev/null
+++ b/arch/frv/mb93090-mb00/pci-vdk.c
@@ -0,0 +1,467 @@
+/* pci-vdk.c: MB93090-MB00 (VDK) PCI support
+ *
+ * Copyright (C) 2003, 2004 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * 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.
+ */
+
+#include <linux/config.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/pci.h>
+#include <linux/init.h>
+#include <linux/ioport.h>
+#include <linux/delay.h>
+#include <linux/slab.h>
+
+#include <asm/segment.h>
+#include <asm/io.h>
+#include <asm/mb-regs.h>
+#include <asm/mb86943a.h>
+#include "pci-frv.h"
+
+unsigned int __nongpreldata pci_probe = 1;
+
+int __nongpreldata pcibios_last_bus = -1;
+struct pci_bus *__nongpreldata pci_root_bus;
+struct pci_ops *__nongpreldata pci_root_ops;
+
+/*
+ * Functions for accessing PCI configuration space
+ */
+
+#define CONFIG_CMD(bus, dev, where) \
+ (0x80000000 | (bus->number << 16) | (devfn << 8) | (where & ~3))
+
+#define __set_PciCfgAddr(A) writel((A), (volatile void __iomem *) __region_CS1 + 0x80)
+
+#define __get_PciCfgDataB(A) readb((volatile void __iomem *) __region_CS1 + 0x88 + ((A) & 3))
+#define __get_PciCfgDataW(A) readw((volatile void __iomem *) __region_CS1 + 0x88 + ((A) & 2))
+#define __get_PciCfgDataL(A) readl((volatile void __iomem *) __region_CS1 + 0x88)
+
+#define __set_PciCfgDataB(A,V) \
+ writeb((V), (volatile void __iomem *) __region_CS1 + 0x88 + (3 - ((A) & 3)))
+
+#define __set_PciCfgDataW(A,V) \
+ writew((V), (volatile void __iomem *) __region_CS1 + 0x88 + (2 - ((A) & 2)))
+
+#define __set_PciCfgDataL(A,V) \
+ writel((V), (volatile void __iomem *) __region_CS1 + 0x88)
+
+#define __get_PciBridgeDataB(A) readb((volatile void __iomem *) __region_CS1 + 0x800 + (A))
+#define __get_PciBridgeDataW(A) readw((volatile void __iomem *) __region_CS1 + 0x800 + (A))
+#define __get_PciBridgeDataL(A) readl((volatile void __iomem *) __region_CS1 + 0x800 + (A))
+
+#define __set_PciBridgeDataB(A,V) writeb((V), (volatile void __iomem *) __region_CS1 + 0x800 + (A))
+#define __set_PciBridgeDataW(A,V) writew((V), (volatile void __iomem *) __region_CS1 + 0x800 + (A))
+#define __set_PciBridgeDataL(A,V) writel((V), (volatile void __iomem *) __region_CS1 + 0x800 + (A))
+
+static inline int __query(const struct pci_dev *dev)
+{
+// return dev->bus->number==0 && (dev->devfn==PCI_DEVFN(0,0));
+// return dev->bus->number==1;
+// return dev->bus->number==0 &&
+// (dev->devfn==PCI_DEVFN(2,0) || dev->devfn==PCI_DEVFN(3,0));
+ return 0;
+}
+
+/*****************************************************************************/
+/*
+ *
+ */
+static int pci_frv_read_config(struct pci_bus *bus, unsigned int devfn, int where, int size,
+ u32 *val)
+{
+ u32 _value;
+
+ if (bus->number == 0 && devfn == PCI_DEVFN(0, 0)) {
+ _value = __get_PciBridgeDataL(where & ~3);
+ }
+ else {
+ __set_PciCfgAddr(CONFIG_CMD(bus, devfn, where));
+ _value = __get_PciCfgDataL(where & ~3);
+ }
+
+ switch (size) {
+ case 1:
+ _value = _value >> ((where & 3) * 8);
+ break;
+
+ case 2:
+ _value = _value >> ((where & 2) * 8);
+ break;
+
+ case 4:
+ break;
+
+ default:
+ BUG();
+ }
+
+ *val = _value;
+ return PCIBIOS_SUCCESSFUL;
+}
+
+static int pci_frv_write_config(struct pci_bus *bus, unsigned int devfn, int where, int size,
+ u32 value)
+{
+ switch (size) {
+ case 1:
+ if (bus->number == 0 && devfn == PCI_DEVFN(0, 0)) {
+ __set_PciBridgeDataB(where, value);
+ }
+ else {
+ __set_PciCfgAddr(CONFIG_CMD(bus, devfn, where));
+ __set_PciCfgDataB(where, value);
+ }
+ break;
+
+ case 2:
+ if (bus->number == 0 && devfn == PCI_DEVFN(0, 0)) {
+ __set_PciBridgeDataW(where, value);
+ }
+ else {
+ __set_PciCfgAddr(CONFIG_CMD(bus, devfn, where));
+ __set_PciCfgDataW(where, value);
+ }
+ break;
+
+ case 4:
+ if (bus->number == 0 && devfn == PCI_DEVFN(0, 0)) {
+ __set_PciBridgeDataL(where, value);
+ }
+ else {
+ __set_PciCfgAddr(CONFIG_CMD(bus, devfn, where));
+ __set_PciCfgDataL(where, value);
+ }
+ break;
+
+ default:
+ BUG();
+ }
+
+ return PCIBIOS_SUCCESSFUL;
+}
+
+static struct pci_ops pci_direct_frv = {
+ pci_frv_read_config,
+ pci_frv_write_config,
+};
+
+/*
+ * Before we decide to use direct hardware access mechanisms, we try to do some
+ * trivial checks to ensure it at least _seems_ to be working -- we just test
+ * whether bus 00 contains a host bridge (this is similar to checking
+ * techniques used in XFree86, but ours should be more reliable since we
+ * attempt to make use of direct access hints provided by the PCI BIOS).
+ *
+ * This should be close to trivial, but it isn't, because there are buggy
+ * chipsets (yes, you guessed it, by Intel and Compaq) that have no class ID.
+ */
+static int __init pci_sanity_check(struct pci_ops *o)
+{
+ struct pci_bus bus; /* Fake bus and device */
+ u32 id;
+
+ bus.number = 0;
+
+ if (o->read(&bus, 0, PCI_VENDOR_ID, 4, &id) == PCIBIOS_SUCCESSFUL) {
+ printk("PCI: VDK Bridge device:vendor: %08x\n", id);
+ if (id == 0x200e10cf)
+ return 1;
+ }
+
+ printk("PCI: VDK Bridge: Sanity check failed\n");
+ return 0;
+}
+
+static struct pci_ops * __init pci_check_direct(void)
+{
+ unsigned long flags;
+
+ local_irq_save(flags);
+
+ /* check if access works */
+ if (pci_sanity_check(&pci_direct_frv)) {
+ local_irq_restore(flags);
+ printk("PCI: Using configuration frv\n");
+// request_mem_region(0xBE040000, 256, "FRV bridge");
+// request_mem_region(0xBFFFFFF4, 12, "PCI frv");
+ return &pci_direct_frv;
+ }
+
+ local_irq_restore(flags);
+ return NULL;
+}
+
+/*
+ * Several buggy motherboards address only 16 devices and mirror
+ * them to next 16 IDs. We try to detect this `feature' on all
+ * primary buses (those containing host bridges as they are
+ * expected to be unique) and remove the ghost devices.
+ */
+
+static void __init pcibios_fixup_ghosts(struct pci_bus *b)
+{
+ struct list_head *ln, *mn;
+ struct pci_dev *d, *e;
+ int mirror = PCI_DEVFN(16,0);
+ int seen_host_bridge = 0;
+ int i;
+
+ for (ln=b->devices.next; ln != &b->devices; ln=ln->next) {
+ d = pci_dev_b(ln);
+ if ((d->class >> 8) == PCI_CLASS_BRIDGE_HOST)
+ seen_host_bridge++;
+ for (mn=ln->next; mn != &b->devices; mn=mn->next) {
+ e = pci_dev_b(mn);
+ if (e->devfn != d->devfn + mirror ||
+ e->vendor != d->vendor ||
+ e->device != d->device ||
+ e->class != d->class)
+ continue;
+ for(i=0; i<PCI_NUM_RESOURCES; i++)
+ if (e->resource[i].start != d->resource[i].start ||
+ e->resource[i].end != d->resource[i].end ||
+ e->resource[i].flags != d->resource[i].flags)
+ continue;
+ break;
+ }
+ if (mn == &b->devices)
+ return;
+ }
+ if (!seen_host_bridge)
+ return;
+ printk("PCI: Ignoring ghost devices on bus %02x\n", b->number);
+
+ ln = &b->devices;
+ while (ln->next != &b->devices) {
+ d = pci_dev_b(ln->next);
+ if (d->devfn >= mirror) {
+ list_del(&d->global_list);
+ list_del(&d->bus_list);
+ kfree(d);
+ } else
+ ln = ln->next;
+ }
+}
+
+/*
+ * Discover remaining PCI buses in case there are peer host bridges.
+ * We use the number of last PCI bus provided by the PCI BIOS.
+ */
+static void __init pcibios_fixup_peer_bridges(void)
+{
+ struct pci_bus bus;
+ struct pci_dev dev;
+ int n;
+ u16 l;
+
+ if (pcibios_last_bus <= 0 || pcibios_last_bus >= 0xff)
+ return;
+ printk("PCI: Peer bridge fixup\n");
+ for (n=0; n <= pcibios_last_bus; n++) {
+ if (pci_find_bus(0, n))
+ continue;
+ bus.number = n;
+ bus.ops = pci_root_ops;
+ dev.bus = &bus;
+ for(dev.devfn=0; dev.devfn<256; dev.devfn += 8)
+ if (!pci_read_config_word(&dev, PCI_VENDOR_ID, &l) &&
+ l != 0x0000 && l != 0xffff) {
+ printk("Found device at %02x:%02x [%04x]\n", n, dev.devfn, l);
+ printk("PCI: Discovered peer bus %02x\n", n);
+ pci_scan_bus(n, pci_root_ops, NULL);
+ break;
+ }
+ }
+}
+
+/*
+ * Exceptions for specific devices. Usually work-arounds for fatal design flaws.
+ */
+
+static void __init pci_fixup_umc_ide(struct pci_dev *d)
+{
+ /*
+ * UM8886BF IDE controller sets region type bits incorrectly,
+ * therefore they look like memory despite of them being I/O.
+ */
+ int i;
+
+ printk("PCI: Fixing base address flags for device %s\n", pci_name(d));
+ for(i=0; i<4; i++)
+ d->resource[i].flags |= PCI_BASE_ADDRESS_SPACE_IO;
+}
+
+static void __init pci_fixup_ide_bases(struct pci_dev *d)
+{
+ int i;
+
+ /*
+ * PCI IDE controllers use non-standard I/O port decoding, respect it.
+ */
+ if ((d->class >> 8) != PCI_CLASS_STORAGE_IDE)
+ return;
+ printk("PCI: IDE base address fixup for %s\n", pci_name(d));
+ for(i=0; i<4; i++) {
+ struct resource *r = &d->resource[i];
+ if ((r->start & ~0x80) == 0x374) {
+ r->start |= 2;
+ r->end = r->start;
+ }
+ }
+}
+
+static void __init pci_fixup_ide_trash(struct pci_dev *d)
+{
+ int i;
+
+ /*
+ * There exist PCI IDE controllers which have utter garbage
+ * in first four base registers. Ignore that.
+ */
+ printk("PCI: IDE base address trash cleared for %s\n", pci_name(d));
+ for(i=0; i<4; i++)
+ d->resource[i].start = d->resource[i].end = d->resource[i].flags = 0;
+}
+
+static void __devinit pci_fixup_latency(struct pci_dev *d)
+{
+ /*
+ * SiS 5597 and 5598 chipsets require latency timer set to
+ * at most 32 to avoid lockups.
+ */
+ DBG("PCI: Setting max latency to 32\n");
+ pcibios_max_latency = 32;
+}
+
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_UMC, PCI_DEVICE_ID_UMC_UM8886BF, pci_fixup_umc_ide);
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_SI, PCI_DEVICE_ID_SI_5513, pci_fixup_ide_trash);
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_SI, PCI_DEVICE_ID_SI_5597, pci_fixup_latency);
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_SI, PCI_DEVICE_ID_SI_5598, pci_fixup_latency);
+DECLARE_PCI_FIXUP_HEADER(PCI_ANY_ID, PCI_ANY_ID, pci_fixup_ide_bases);
+
+/*
+ * Called after each bus is probed, but before its children
+ * are examined.
+ */
+
+void __init pcibios_fixup_bus(struct pci_bus *bus)
+{
+#if 0
+ printk("### PCIBIOS_FIXUP_BUS(%d)\n",bus->number);
+#endif
+ pcibios_fixup_ghosts(bus);
+ pci_read_bridge_bases(bus);
+
+ if (bus->number == 0) {
+ struct list_head *ln;
+ struct pci_dev *dev;
+ for (ln=bus->devices.next; ln != &bus->devices; ln=ln->next) {
+ dev = pci_dev_b(ln);
+ if (dev->devfn == 0) {
+ dev->resource[0].start = 0;
+ dev->resource[0].end = 0;
+ }
+ }
+ }
+}
+
+/*
+ * Initialization. Try all known PCI access methods. Note that we support
+ * using both PCI BIOS and direct access: in such cases, we use I/O ports
+ * to access config space, but we still keep BIOS order of cards to be
+ * compatible with 2.0.X. This should go away some day.
+ */
+
+int __init pcibios_init(void)
+{
+ struct pci_ops *dir = NULL;
+
+ if (!mb93090_mb00_detected)
+ return -ENXIO;
+
+ __reg_MB86943_sl_ctl |= MB86943_SL_CTL_DRCT_MASTER_SWAP | MB86943_SL_CTL_DRCT_SLAVE_SWAP;
+
+ __reg_MB86943_ecs_base(1) = ((__region_CS2 + 0x01000000) >> 9) | 0x08000000;
+ __reg_MB86943_ecs_base(2) = ((__region_CS2 + 0x00000000) >> 9) | 0x08000000;
+
+ *(volatile uint32_t *) (__region_CS1 + 0x848) = 0xe0000000;
+ *(volatile uint32_t *) (__region_CS1 + 0x8b8) = 0x00000000;
+
+ __reg_MB86943_sl_pci_io_base = (__region_CS2 + 0x04000000) >> 9;
+ __reg_MB86943_sl_pci_mem_base = (__region_CS2 + 0x08000000) >> 9;
+ __reg_MB86943_pci_sl_io_base = __region_CS2 + 0x04000000;
+ __reg_MB86943_pci_sl_mem_base = __region_CS2 + 0x08000000;
+ mb();
+
+ *(volatile unsigned long *)(__region_CS2+0x01300014) == 1;
+
+ ioport_resource.start = (__reg_MB86943_sl_pci_io_base << 9) & 0xfffffc00;
+ ioport_resource.end = (__reg_MB86943_sl_pci_io_range << 9) | 0x3ff;
+ ioport_resource.end += ioport_resource.start;
+
+ printk("PCI IO window: %08lx-%08lx\n", ioport_resource.start, ioport_resource.end);
+
+ iomem_resource.start = (__reg_MB86943_sl_pci_mem_base << 9) & 0xfffffc00;
+
+ /* Reserve somewhere to write to flush posted writes. */
+ iomem_resource.start += 0x400;
+
+ iomem_resource.end = (__reg_MB86943_sl_pci_mem_range << 9) | 0x3ff;
+ iomem_resource.end += iomem_resource.start;
+
+ printk("PCI MEM window: %08lx-%08lx\n", iomem_resource.start, iomem_resource.end);
+ printk("PCI DMA memory: %08lx-%08lx\n", dma_coherent_mem_start, dma_coherent_mem_end);
+
+ if (!pci_probe)
+ return -ENXIO;
+
+ dir = pci_check_direct();
+ if (dir)
+ pci_root_ops = dir;
+ else {
+ printk("PCI: No PCI bus detected\n");
+ return -ENXIO;
+ }
+
+ printk("PCI: Probing PCI hardware\n");
+ pci_root_bus = pci_scan_bus(0, pci_root_ops, NULL);
+
+ pcibios_irq_init();
+ pcibios_fixup_peer_bridges();
+ pcibios_fixup_irqs();
+ pcibios_resource_survey();
+
+ return 0;
+}
+
+arch_initcall(pcibios_init);
+
+char * __init pcibios_setup(char *str)
+{
+ if (!strcmp(str, "off")) {
+ pci_probe = 0;
+ return NULL;
+ } else if (!strncmp(str, "lastbus=", 8)) {
+ pcibios_last_bus = simple_strtol(str+8, NULL, 0);
+ return NULL;
+ }
+ return str;
+}
+
+int pcibios_enable_device(struct pci_dev *dev, int mask)
+{
+ int err;
+
+ if ((err = pcibios_enable_resources(dev, mask)) < 0)
+ return err;
+ pcibios_enable_irq(dev);
+ return 0;
+}
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