forked from Minki/linux
f90bb153b1
This patch reworks the way IRQs are fixed up on PCI for arch powerpc. It makes pci_read_irq_line() called by default in the PCI code for devices that are probed, and add an optional per-device fixup in ppc_md for platforms that really need to correct what they obtain from pci_read_irq_line(). It also removes ppc_md.irq_bus_setup which was only used by pSeries and should not be needed anymore. I've also removed the pSeries s7a workaround as it can't work with the current interrupt code anyway. I'm trying to get one of these machines working so I can test a proper fix for that problem. I also haven't updated the old-style fixup code from 85xx_cds.c because it's actually buggy :) It assigns pci_dev->irq hard coded numbers which is no good with the new IRQ mapping code. It should at least use irq_create_mapping(NULL, hard_coded_number); and possibly also set_irq_type() to set them as level low. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
303 lines
7.3 KiB
C
303 lines
7.3 KiB
C
/*
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* mpc7448_hpc2.c
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*
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* Board setup routines for the Freescale mpc7448hpc2(taiga) platform
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*
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* Author: Jacob Pan
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* jacob.pan@freescale.com
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* Author: Xianghua Xiao
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* x.xiao@freescale.com
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* Maintainer: Roy Zang <tie-fei.zang@freescale.com>
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* Add Flat Device Tree support fot mpc7448hpc2 board
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*
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* Copyright 2004-2006 Freescale Semiconductor, Inc.
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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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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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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/ide.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 <asm/system.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 "mpc7448_hpc2.h"
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#include <asm/tsi108_irq.h>
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#include <asm/mpic.h>
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#undef DEBUG
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#ifdef DEBUG
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#define DBG(fmt...) do { printk(fmt); } while(0)
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#else
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#define DBG(fmt...) do { } while(0)
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#endif
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#ifndef CONFIG_PCI
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isa_io_base = MPC7448_HPC2_ISA_IO_BASE;
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isa_mem_base = MPC7448_HPC2_ISA_MEM_BASE;
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pci_dram_offset = MPC7448_HPC2_PCI_MEM_OFFSET;
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#endif
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extern int tsi108_setup_pci(struct device_node *dev);
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extern void _nmask_and_or_msr(unsigned long nmask, unsigned long or_val);
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extern void tsi108_pci_int_init(void);
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extern void tsi108_irq_cascade(unsigned int irq, struct irq_desc *desc);
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int mpc7448_hpc2_exclude_device(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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/*
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* find pci slot by devfn in interrupt map of OF tree
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*/
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u8 find_slot_by_devfn(unsigned int *interrupt_map, unsigned int devfn)
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{
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int i;
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unsigned int tmp;
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for (i = 0; i < 4; i++){
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tmp = interrupt_map[i*4*7];
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if ((tmp >> 11) == (devfn >> 3))
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return i;
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}
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return i;
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}
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/*
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* Scans the interrupt map for pci device
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*/
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void __devinit mpc7448_hpc2_fixup_irq(struct pci_dev *dev)
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{
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struct pci_controller *hose;
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struct device_node *node;
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const unsigned int *interrupt;
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int busnr;
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int len;
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u8 slot;
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u8 pin;
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/* Lookup the hose */
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busnr = dev->bus->number;
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hose = pci_bus_to_hose(busnr);
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if (!hose)
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printk(KERN_ERR "No pci hose found\n");
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/* Check it has an OF node associated */
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node = (struct device_node *) hose->arch_data;
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if (!node)
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printk(KERN_ERR "No pci node found\n");
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interrupt = get_property(node, "interrupt-map", &len);
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slot = find_slot_by_devfn(interrupt, dev->devfn);
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pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
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if (pin == 0 || pin > 4)
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pin = 1;
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pin--;
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dev->irq = interrupt[slot*4*7 + pin*7 + 5];
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pci_write_config_byte(dev, PCI_INTERRUPT_LINE, dev->irq);
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DBG("TSI_PCI: dev->irq = 0x%x\n", dev->irq);
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}
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/* temporary pci irq map fixup*/
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static void __init mpc7448_hpc2_setup_arch(void)
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{
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struct device_node *cpu;
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struct device_node *np;
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if (ppc_md.progress)
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ppc_md.progress("mpc7448_hpc2_setup_arch():set_bridge", 0);
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cpu = of_find_node_by_type(NULL, "cpu");
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if (cpu != 0) {
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const unsigned int *fp;
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fp = get_property(cpu, "clock-frequency", NULL);
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if (fp != 0)
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loops_per_jiffy = *fp / HZ;
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else
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loops_per_jiffy = 50000000 / HZ;
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of_node_put(cpu);
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}
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tsi108_csr_vir_base = get_vir_csrbase();
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#ifdef CONFIG_ROOT_NFS
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ROOT_DEV = Root_NFS;
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#else
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ROOT_DEV = Root_HDA1;
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#endif
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#ifdef CONFIG_BLK_DEV_INITRD
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ROOT_DEV = Root_RAM0;
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#endif
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/* setup PCI host bridge */
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#ifdef CONFIG_PCI
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for (np = NULL; (np = of_find_node_by_type(np, "pci")) != NULL;)
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tsi108_setup_pci(np);
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ppc_md.pci_exclude_device = mpc7448_hpc2_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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#endif
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printk(KERN_INFO "MPC7448HPC2 (TAIGA) Platform\n");
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printk(KERN_INFO
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"Jointly ported by Freescale and Tundra Semiconductor\n");
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printk(KERN_INFO
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"Enabling L2 cache then enabling the HID0 prefetch engine.\n");
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}
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/*
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* Interrupt setup and service. Interrrupts on the mpc7448_hpc2 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 Taiga 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 mpc7448_hpc2_init_IRQ(void)
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{
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struct mpic *mpic;
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phys_addr_t mpic_paddr = 0;
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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 *tsi_pic;
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tsi_pic = of_find_node_by_type(NULL, "open-pic");
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if (tsi_pic) {
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unsigned int size;
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const void *prop = get_property(tsi_pic, "reg", &size);
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mpic_paddr = of_translate_address(tsi_pic, prop);
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}
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if (mpic_paddr == 0) {
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printk("%s: No tsi108 PIC found !\n", __FUNCTION__);
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return;
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}
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DBG("%s: tsi108pic phys_addr = 0x%x\n", __FUNCTION__,
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(u32) mpic_paddr);
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mpic = mpic_alloc(tsi_pic, mpic_paddr,
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MPIC_PRIMARY | MPIC_BIG_ENDIAN | MPIC_WANTS_RESET |
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MPIC_SPV_EOI | MPIC_NO_PTHROU_DIS | MPIC_REGSET_TSI108,
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0, /* num_sources used */
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0, /* num_sources used */
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"Tsi108_PIC");
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BUG_ON(mpic == NULL); /* XXXX */
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mpic_init(mpic);
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tsi_pci = of_find_node_by_type(NULL, "pci");
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if (tsi_pci == 0) {
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printk("%s: No tsi108 pci node found !\n", __FUNCTION__);
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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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set_irq_data(cascade_pci_irq, mpic);
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set_irq_chained_handler(cascade_pci_irq, tsi108_irq_cascade);
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tsi108_pci_int_init();
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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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of_node_put(tsi_pic);
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}
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void mpc7448_hpc2_show_cpuinfo(struct seq_file *m)
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{
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seq_printf(m, "vendor\t\t: Freescale Semiconductor\n");
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seq_printf(m, "machine\t\t: MPC7448hpc2\n");
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}
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void mpc7448_hpc2_restart(char *cmd)
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{
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local_irq_disable();
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/* Set exception prefix high - to the firmware */
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_nmask_and_or_msr(0, MSR_IP);
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for (;;) ; /* Spin until reset happens */
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}
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void mpc7448_hpc2_power_off(void)
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{
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local_irq_disable();
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for (;;) ; /* No way to shut power off with software */
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}
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void mpc7448_hpc2_halt(void)
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{
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mpc7448_hpc2_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 mpc7448_hpc2_probe(void)
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{
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unsigned long root = of_get_flat_dt_root();
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if (!of_flat_dt_is_compatible(root, "mpc74xx"))
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return 0;
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return 1;
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}
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static int mpc7448_machine_check_exception(struct pt_regs *regs)
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{
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extern void tsi108_clear_pci_cfg_error(void);
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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(mpc7448_hpc2){
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.name = "MPC7448 HPC2",
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.probe = mpc7448_hpc2_probe,
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.setup_arch = mpc7448_hpc2_setup_arch,
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.init_IRQ = mpc7448_hpc2_init_IRQ,
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.show_cpuinfo = mpc7448_hpc2_show_cpuinfo,
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.get_irq = mpic_get_irq,
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.pci_irq_fixup = mpc7448_hpc2_fixup_irq,
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.restart = mpc7448_hpc2_restart,
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.calibrate_decr = generic_calibrate_decr,
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.machine_check_exception= mpc7448_machine_check_exception,
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.progress = udbg_progress,
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};
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