powerpc: Merge 32-bit CHRP support.
SMP still needs more work but UP gets as far as starting userspace
at least. This uses the 64-bit-style code for spinning up the cpus.
Signed-off-by: Paul Mackerras <paulus@samba.org>
diff --git a/arch/powerpc/platforms/chrp/pci.c b/arch/powerpc/platforms/chrp/pci.c
new file mode 100644
index 0000000..82c429d
--- /dev/null
+++ b/arch/powerpc/platforms/chrp/pci.c
@@ -0,0 +1,310 @@
+/*
+ * CHRP pci routines.
+ */
+
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/pci.h>
+#include <linux/delay.h>
+#include <linux/string.h>
+#include <linux/init.h>
+#include <linux/ide.h>
+
+#include <asm/io.h>
+#include <asm/pgtable.h>
+#include <asm/irq.h>
+#include <asm/hydra.h>
+#include <asm/prom.h>
+#include <asm/gg2.h>
+#include <asm/machdep.h>
+#include <asm/sections.h>
+#include <asm/pci-bridge.h>
+#include <asm/open_pic.h>
+#include <asm/grackle.h>
+#include <asm/rtas.h>
+
+/* LongTrail */
+void __iomem *gg2_pci_config_base;
+
+/*
+ * The VLSI Golden Gate II has only 512K of PCI configuration space, so we
+ * limit the bus number to 3 bits
+ */
+
+int gg2_read_config(struct pci_bus *bus, unsigned int devfn, int off,
+ int len, u32 *val)
+{
+ volatile void __iomem *cfg_data;
+ struct pci_controller *hose = bus->sysdata;
+
+ if (bus->number > 7)
+ return PCIBIOS_DEVICE_NOT_FOUND;
+ /*
+ * Note: the caller has already checked that off is
+ * suitably aligned and that len is 1, 2 or 4.
+ */
+ cfg_data = hose->cfg_data + ((bus->number<<16) | (devfn<<8) | off);
+ switch (len) {
+ case 1:
+ *val = in_8(cfg_data);
+ break;
+ case 2:
+ *val = in_le16(cfg_data);
+ break;
+ default:
+ *val = in_le32(cfg_data);
+ break;
+ }
+ return PCIBIOS_SUCCESSFUL;
+}
+
+int gg2_write_config(struct pci_bus *bus, unsigned int devfn, int off,
+ int len, u32 val)
+{
+ volatile void __iomem *cfg_data;
+ struct pci_controller *hose = bus->sysdata;
+
+ if (bus->number > 7)
+ return PCIBIOS_DEVICE_NOT_FOUND;
+ /*
+ * Note: the caller has already checked that off is
+ * suitably aligned and that len is 1, 2 or 4.
+ */
+ cfg_data = hose->cfg_data + ((bus->number<<16) | (devfn<<8) | off);
+ switch (len) {
+ case 1:
+ out_8(cfg_data, val);
+ break;
+ case 2:
+ out_le16(cfg_data, val);
+ break;
+ default:
+ out_le32(cfg_data, val);
+ break;
+ }
+ return PCIBIOS_SUCCESSFUL;
+}
+
+static struct pci_ops gg2_pci_ops =
+{
+ gg2_read_config,
+ gg2_write_config
+};
+
+/*
+ * Access functions for PCI config space using RTAS calls.
+ */
+int rtas_read_config(struct pci_bus *bus, unsigned int devfn, int offset,
+ int len, u32 *val)
+{
+ struct pci_controller *hose = bus->sysdata;
+ unsigned long addr = (offset & 0xff) | ((devfn & 0xff) << 8)
+ | (((bus->number - hose->first_busno) & 0xff) << 16)
+ | (hose->index << 24);
+ int ret = -1;
+ int rval;
+
+ rval = rtas_call(rtas_token("read-pci-config"), 2, 2, &ret, addr, len);
+ *val = ret;
+ return rval? PCIBIOS_DEVICE_NOT_FOUND: PCIBIOS_SUCCESSFUL;
+}
+
+int rtas_write_config(struct pci_bus *bus, unsigned int devfn, int offset,
+ int len, u32 val)
+{
+ struct pci_controller *hose = bus->sysdata;
+ unsigned long addr = (offset & 0xff) | ((devfn & 0xff) << 8)
+ | (((bus->number - hose->first_busno) & 0xff) << 16)
+ | (hose->index << 24);
+ int rval;
+
+ rval = rtas_call(rtas_token("write-pci-config"), 3, 1, NULL,
+ addr, len, val);
+ return rval? PCIBIOS_DEVICE_NOT_FOUND: PCIBIOS_SUCCESSFUL;
+}
+
+static struct pci_ops rtas_pci_ops =
+{
+ rtas_read_config,
+ rtas_write_config
+};
+
+volatile struct Hydra __iomem *Hydra = NULL;
+
+int __init
+hydra_init(void)
+{
+ struct device_node *np;
+
+ np = find_devices("mac-io");
+ if (np == NULL || np->n_addrs == 0)
+ return 0;
+ Hydra = ioremap(np->addrs[0].address, np->addrs[0].size);
+ printk("Hydra Mac I/O at %lx\n", np->addrs[0].address);
+ printk("Hydra Feature_Control was %x",
+ in_le32(&Hydra->Feature_Control));
+ out_le32(&Hydra->Feature_Control, (HYDRA_FC_SCC_CELL_EN |
+ HYDRA_FC_SCSI_CELL_EN |
+ HYDRA_FC_SCCA_ENABLE |
+ HYDRA_FC_SCCB_ENABLE |
+ HYDRA_FC_ARB_BYPASS |
+ HYDRA_FC_MPIC_ENABLE |
+ HYDRA_FC_SLOW_SCC_PCLK |
+ HYDRA_FC_MPIC_IS_MASTER));
+ printk(", now %x\n", in_le32(&Hydra->Feature_Control));
+ return 1;
+}
+
+void __init
+chrp_pcibios_fixup(void)
+{
+ struct pci_dev *dev = NULL;
+ struct device_node *np;
+
+ /* PCI interrupts are controlled by the OpenPIC */
+ for_each_pci_dev(dev) {
+ np = pci_device_to_OF_node(dev);
+ if ((np != 0) && (np->n_intrs > 0) && (np->intrs[0].line != 0))
+ dev->irq = np->intrs[0].line;
+ pci_write_config_byte(dev, PCI_INTERRUPT_LINE, dev->irq);
+ }
+}
+
+#define PRG_CL_RESET_VALID 0x00010000
+
+static void __init
+setup_python(struct pci_controller *hose, struct device_node *dev)
+{
+ u32 __iomem *reg;
+ u32 val;
+ unsigned long addr = dev->addrs[0].address;
+
+ setup_indirect_pci(hose, addr + 0xf8000, addr + 0xf8010);
+
+ /* Clear the magic go-slow bit */
+ reg = ioremap(dev->addrs[0].address + 0xf6000, 0x40);
+ val = in_be32(®[12]);
+ if (val & PRG_CL_RESET_VALID) {
+ out_be32(®[12], val & ~PRG_CL_RESET_VALID);
+ in_be32(®[12]);
+ }
+ iounmap(reg);
+}
+
+/* Marvell Discovery II based Pegasos 2 */
+static void __init setup_peg2(struct pci_controller *hose, struct device_node *dev)
+{
+ struct device_node *root = find_path_device("/");
+ struct device_node *rtas;
+
+ rtas = of_find_node_by_name (root, "rtas");
+ if (rtas) {
+ hose->ops = &rtas_pci_ops;
+ } else {
+ printk ("RTAS supporting Pegasos OF not found, please upgrade"
+ " your firmware\n");
+ }
+ pci_assign_all_buses = 1;
+}
+
+void __init
+chrp_find_bridges(void)
+{
+ struct device_node *dev;
+ int *bus_range;
+ int len, index = -1;
+ struct pci_controller *hose;
+ unsigned int *dma;
+ char *model, *machine;
+ int is_longtrail = 0, is_mot = 0, is_pegasos = 0;
+ struct device_node *root = find_path_device("/");
+
+ /*
+ * The PCI host bridge nodes on some machines don't have
+ * properties to adequately identify them, so we have to
+ * look at what sort of machine this is as well.
+ */
+ machine = get_property(root, "model", NULL);
+ if (machine != NULL) {
+ is_longtrail = strncmp(machine, "IBM,LongTrail", 13) == 0;
+ is_mot = strncmp(machine, "MOT", 3) == 0;
+ if (strncmp(machine, "Pegasos2", 8) == 0)
+ is_pegasos = 2;
+ else if (strncmp(machine, "Pegasos", 7) == 0)
+ is_pegasos = 1;
+ }
+ for (dev = root->child; dev != NULL; dev = dev->sibling) {
+ if (dev->type == NULL || strcmp(dev->type, "pci") != 0)
+ continue;
+ ++index;
+ /* The GG2 bridge on the LongTrail doesn't have an address */
+ if (dev->n_addrs < 1 && !is_longtrail) {
+ printk(KERN_WARNING "Can't use %s: no address\n",
+ dev->full_name);
+ continue;
+ }
+ bus_range = (int *) get_property(dev, "bus-range", &len);
+ if (bus_range == NULL || len < 2 * sizeof(int)) {
+ printk(KERN_WARNING "Can't get bus-range for %s\n",
+ dev->full_name);
+ continue;
+ }
+ if (bus_range[1] == bus_range[0])
+ printk(KERN_INFO "PCI bus %d", bus_range[0]);
+ else
+ printk(KERN_INFO "PCI buses %d..%d",
+ bus_range[0], bus_range[1]);
+ printk(" controlled by %s", dev->type);
+ if (dev->n_addrs > 0)
+ printk(" at %lx", dev->addrs[0].address);
+ printk("\n");
+
+ hose = pcibios_alloc_controller();
+ if (!hose) {
+ printk("Can't allocate PCI controller structure for %s\n",
+ dev->full_name);
+ continue;
+ }
+ hose->arch_data = dev;
+ hose->first_busno = bus_range[0];
+ hose->last_busno = bus_range[1];
+
+ model = get_property(dev, "model", NULL);
+ if (model == NULL)
+ model = "<none>";
+ if (device_is_compatible(dev, "IBM,python")) {
+ setup_python(hose, dev);
+ } else if (is_mot
+ || strncmp(model, "Motorola, Grackle", 17) == 0) {
+ setup_grackle(hose);
+ } else if (is_longtrail) {
+ void __iomem *p = ioremap(GG2_PCI_CONFIG_BASE, 0x80000);
+ hose->ops = &gg2_pci_ops;
+ hose->cfg_data = p;
+ gg2_pci_config_base = p;
+ } else if (is_pegasos == 1) {
+ setup_indirect_pci(hose, 0xfec00cf8, 0xfee00cfc);
+ } else if (is_pegasos == 2) {
+ setup_peg2(hose, dev);
+ } else {
+ printk("No methods for %s (model %s), using RTAS\n",
+ dev->full_name, model);
+ hose->ops = &rtas_pci_ops;
+ }
+
+ pci_process_bridge_OF_ranges(hose, dev, index == 0);
+
+ /* check the first bridge for a property that we can
+ use to set pci_dram_offset */
+ dma = (unsigned int *)
+ get_property(dev, "ibm,dma-ranges", &len);
+ if (index == 0 && dma != NULL && len >= 6 * sizeof(*dma)) {
+ pci_dram_offset = dma[2] - dma[3];
+ printk("pci_dram_offset = %lx\n", pci_dram_offset);
+ }
+ }
+
+ /* Do not fixup interrupts from OF tree on pegasos */
+ if (is_pegasos == 0)
+ ppc_md.pcibios_fixup = chrp_pcibios_fixup;
+}