forked from Minki/linux
e55d7f737d
There are two separate flags controlling whether or not the MPIC is reset during initialization, which is completely unnecessary, and only one of them can be specified in the device tree. Also, most platforms in-tree right now do actually want to reset the MPIC during initialization anyways, which means lots of duplicate code passing the MPIC_WANTS_RESET flag. Fix all of the callers which currently do not pass the MPIC_WANTS_RESET flag to pass the MPIC_NO_RESET flag, then remove the MPIC_WANTS_RESET flag and make the code reset the MPIC by default. Signed-off-by: Kyle Moffett <Kyle.D.Moffett@boeing.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
209 lines
5.2 KiB
C
209 lines
5.2 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/module.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 <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 <asm/tsi108_pci.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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#define MPC7448HPC2_PCI_CFG_PHYS 0xfb000000
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int mpc7448_hpc2_exclude_device(struct pci_controller *hose,
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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 __init mpc7448_hpc2_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("mpc7448_hpc2_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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#ifdef CONFIG_PCI
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for_each_compatible_node(np, "pci", "tsi108-pci")
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tsi108_setup_pci(np, MPC7448HPC2_PCI_CFG_PHYS, 0);
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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. Interrupts 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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#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("%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("%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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DBG("%s: tsi108 cascade_pci_irq = 0x%x\n", __func__,
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(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 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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}
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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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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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.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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