284 lines
7.1 KiB
C
284 lines
7.1 KiB
C
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/*
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* Board setup routines for the IBM 750GX/CL platform w/ TSI10x bridge
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*
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* Copyright 2007 IBM Corporation
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*
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* Stephen Winiecki <stevewin@us.ibm.com>
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* Josh Boyer <jwboyer@linux.vnet.ibm.com>
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*
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* Based on code from mpc7448_hpc2.c
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*/
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#include <linux/stddef.h>
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#include <linux/kernel.h>
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#include <linux/pci.h>
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#include <linux/kdev_t.h>
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#include <linux/console.h>
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#include <linux/delay.h>
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#include <linux/irq.h>
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#include <linux/seq_file.h>
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#include <linux/root_dev.h>
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#include <linux/serial.h>
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#include <linux/tty.h>
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#include <linux/serial_core.h>
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#include <linux/of_platform.h>
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#include <linux/extable.h>
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#include <asm/time.h>
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#include <asm/machdep.h>
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#include <asm/prom.h>
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#include <asm/udbg.h>
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#include <asm/tsi108.h>
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#include <asm/pci-bridge.h>
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#include <asm/reg.h>
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#include <mm/mmu_decl.h>
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#include <asm/tsi108_irq.h>
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#include <asm/tsi108_pci.h>
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#include <asm/mpic.h>
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#undef DEBUG
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#define HOLLY_PCI_CFG_PHYS 0x7c000000
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int holly_exclude_device(struct pci_controller *hose, u_char bus, u_char devfn)
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{
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if (bus == 0 && PCI_SLOT(devfn) == 0)
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return PCIBIOS_DEVICE_NOT_FOUND;
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else
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return PCIBIOS_SUCCESSFUL;
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}
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static void holly_remap_bridge(void)
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{
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u32 lut_val, lut_addr;
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int i;
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printk(KERN_INFO "Remapping PCI bridge\n");
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/* Re-init the PCI bridge and LUT registers to have mappings that don't
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* rely on PIBS
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*/
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lut_addr = 0x900;
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for (i = 0; i < 31; i++) {
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tsi108_write_reg(TSI108_PB_OFFSET + lut_addr, 0x00000201);
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lut_addr += 4;
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tsi108_write_reg(TSI108_PB_OFFSET + lut_addr, 0x0);
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lut_addr += 4;
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}
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/* Reserve the last LUT entry for PCI I/O space */
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tsi108_write_reg(TSI108_PB_OFFSET + lut_addr, 0x00000241);
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lut_addr += 4;
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tsi108_write_reg(TSI108_PB_OFFSET + lut_addr, 0x0);
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/* Map PCI I/O space */
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tsi108_write_reg(TSI108_PCI_PFAB_IO_UPPER, 0x0);
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tsi108_write_reg(TSI108_PCI_PFAB_IO, 0x1);
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/* Map PCI CFG space */
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tsi108_write_reg(TSI108_PCI_PFAB_BAR0_UPPER, 0x0);
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tsi108_write_reg(TSI108_PCI_PFAB_BAR0, 0x7c000000 | 0x01);
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/* We don't need MEM32 and PRM remapping so disable them */
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tsi108_write_reg(TSI108_PCI_PFAB_MEM32, 0x0);
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tsi108_write_reg(TSI108_PCI_PFAB_PFM3, 0x0);
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tsi108_write_reg(TSI108_PCI_PFAB_PFM4, 0x0);
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/* Set P2O_BAR0 */
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tsi108_write_reg(TSI108_PCI_P2O_BAR0_UPPER, 0x0);
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tsi108_write_reg(TSI108_PCI_P2O_BAR0, 0xc0000000);
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/* Init the PCI LUTs to do no remapping */
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lut_addr = 0x500;
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lut_val = 0x00000002;
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for (i = 0; i < 32; i++) {
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tsi108_write_reg(TSI108_PCI_OFFSET + lut_addr, lut_val);
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lut_addr += 4;
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tsi108_write_reg(TSI108_PCI_OFFSET + lut_addr, 0x40000000);
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lut_addr += 4;
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lut_val += 0x02000000;
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}
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tsi108_write_reg(TSI108_PCI_P2O_PAGE_SIZES, 0x00007900);
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/* Set 64-bit PCI bus address for system memory */
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tsi108_write_reg(TSI108_PCI_P2O_BAR2_UPPER, 0x0);
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tsi108_write_reg(TSI108_PCI_P2O_BAR2, 0x0);
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}
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static void __init holly_setup_arch(void)
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{
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struct device_node *np;
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if (ppc_md.progress)
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ppc_md.progress("holly_setup_arch():set_bridge", 0);
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tsi108_csr_vir_base = get_vir_csrbase();
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/* setup PCI host bridge */
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holly_remap_bridge();
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np = of_find_node_by_type(NULL, "pci");
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if (np)
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tsi108_setup_pci(np, HOLLY_PCI_CFG_PHYS, 1);
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ppc_md.pci_exclude_device = holly_exclude_device;
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if (ppc_md.progress)
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ppc_md.progress("tsi108: resources set", 0x100);
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printk(KERN_INFO "PPC750GX/CL Platform\n");
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}
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/*
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* Interrupt setup and service. Interrupts on the holly come
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* from the four external INT pins, PCI interrupts are routed via
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* PCI interrupt control registers, it generates internal IRQ23
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*
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* Interrupt routing on the Holly Board:
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* TSI108:PB_INT[0] -> CPU0:INT#
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* TSI108:PB_INT[1] -> CPU0:MCP#
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* TSI108:PB_INT[2] -> N/C
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* TSI108:PB_INT[3] -> N/C
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*/
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static void __init holly_init_IRQ(void)
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{
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struct mpic *mpic;
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#ifdef CONFIG_PCI
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unsigned int cascade_pci_irq;
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struct device_node *tsi_pci;
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struct device_node *cascade_node = NULL;
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#endif
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mpic = mpic_alloc(NULL, 0, MPIC_BIG_ENDIAN |
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MPIC_SPV_EOI | MPIC_NO_PTHROU_DIS | MPIC_REGSET_TSI108,
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24, 0,
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"Tsi108_PIC");
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BUG_ON(mpic == NULL);
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mpic_assign_isu(mpic, 0, mpic->paddr + 0x100);
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mpic_init(mpic);
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#ifdef CONFIG_PCI
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tsi_pci = of_find_node_by_type(NULL, "pci");
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if (tsi_pci == NULL) {
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printk(KERN_ERR "%s: No tsi108 pci node found !\n", __func__);
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return;
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}
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cascade_node = of_find_node_by_type(NULL, "pic-router");
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if (cascade_node == NULL) {
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printk(KERN_ERR "%s: No tsi108 pci cascade node found !\n", __func__);
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return;
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}
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cascade_pci_irq = irq_of_parse_and_map(tsi_pci, 0);
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pr_debug("%s: tsi108 cascade_pci_irq = 0x%x\n", __func__, (u32) cascade_pci_irq);
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tsi108_pci_int_init(cascade_node);
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irq_set_handler_data(cascade_pci_irq, mpic);
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irq_set_chained_handler(cascade_pci_irq, tsi108_irq_cascade);
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#endif
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/* Configure MPIC outputs to CPU0 */
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tsi108_write_reg(TSI108_MPIC_OFFSET + 0x30c, 0);
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}
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void holly_show_cpuinfo(struct seq_file *m)
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{
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seq_printf(m, "vendor\t\t: IBM\n");
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seq_printf(m, "machine\t\t: PPC750 GX/CL\n");
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}
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void __noreturn holly_restart(char *cmd)
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{
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__be32 __iomem *ocn_bar1 = NULL;
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unsigned long bar;
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struct device_node *bridge = NULL;
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const void *prop;
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int size;
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phys_addr_t addr = 0xc0000000;
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local_irq_disable();
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bridge = of_find_node_by_type(NULL, "tsi-bridge");
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if (bridge) {
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prop = of_get_property(bridge, "reg", &size);
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addr = of_translate_address(bridge, prop);
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}
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addr += (TSI108_PB_OFFSET + 0x414);
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ocn_bar1 = ioremap(addr, 0x4);
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/* Turn on the BOOT bit so the addresses are correctly
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* routed to the HLP interface */
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bar = ioread32be(ocn_bar1);
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bar |= 2;
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iowrite32be(bar, ocn_bar1);
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iosync();
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/* Set SRR0 to the reset vector and turn on MSR_IP */
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mtspr(SPRN_SRR0, 0xfff00100);
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mtspr(SPRN_SRR1, MSR_IP);
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/* Do an rfi to jump back to firmware. Somewhat evil,
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* but it works
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*/
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__asm__ __volatile__("rfi" : : : "memory");
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/* Spin until reset happens. Shouldn't really get here */
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for (;;) ;
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}
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void holly_power_off(void)
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{
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local_irq_disable();
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/* No way to shut power off with software */
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for (;;) ;
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}
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void holly_halt(void)
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{
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holly_power_off();
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}
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/*
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* Called very early, device-tree isn't unflattened
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*/
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static int __init holly_probe(void)
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{
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if (!of_machine_is_compatible("ibm,holly"))
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return 0;
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return 1;
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}
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static int ppc750_machine_check_exception(struct pt_regs *regs)
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{
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const struct exception_table_entry *entry;
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/* Are we prepared to handle this fault */
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if ((entry = search_exception_tables(regs->nip)) != NULL) {
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tsi108_clear_pci_cfg_error();
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regs->msr |= MSR_RI;
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regs->nip = entry->fixup;
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return 1;
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}
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return 0;
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}
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define_machine(holly){
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.name = "PPC750 GX/CL TSI",
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.probe = holly_probe,
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.setup_arch = holly_setup_arch,
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.init_IRQ = holly_init_IRQ,
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.show_cpuinfo = holly_show_cpuinfo,
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.get_irq = mpic_get_irq,
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.restart = holly_restart,
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.calibrate_decr = generic_calibrate_decr,
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.machine_check_exception = ppc750_machine_check_exception,
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.progress = udbg_progress,
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};
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