arch/powerpc/platforms/embedded6xx/mpc7448_hpc2.c

   1 /*
   2  * mpc7448_hpc2.c
   3  *
   4  * Board setup routines for the Freescale mpc7448hpc2(taiga) platform
   5  *
   6  * Author: Jacob Pan
   7  *       jacob.pan@freescale.com
   8  * Author: Xianghua Xiao
   9  *       x.xiao@freescale.com
  10  * Maintainer: Roy Zang <tie-fei.zang@freescale.com>
  11  *      Add Flat Device Tree support fot mpc7448hpc2 board
  12  *
  13  * Copyright 2004-2006 Freescale Semiconductor, Inc.
  14  *
  15  * This program is free software; you can redistribute it and/or
  16  * modify it under the terms of the GNU General Public License
  17  * as published by the Free Software Foundation; either version
  18  * 2 of the License, or (at your option) any later version.
  19  */
  20
  21 #include <linux/stddef.h>
  22 #include <linux/kernel.h>
  23 #include <linux/pci.h>
  24 #include <linux/kdev_t.h>
  25 #include <linux/console.h>
  26 #include <linux/delay.h>
  27 #include <linux/irq.h>
  28 #include <linux/seq_file.h>
  29 #include <linux/root_dev.h>
  30 #include <linux/serial.h>
  31 #include <linux/tty.h>
  32 #include <linux/serial_core.h>
  33
  34 #include <asm/system.h>
  35 #include <asm/time.h>
  36 #include <asm/machdep.h>
  37 #include <asm/prom.h>
  38 #include <asm/udbg.h>
  39 #include <asm/tsi108.h>
  40 #include <asm/pci-bridge.h>
  41 #include <asm/reg.h>
  42 #include <mm/mmu_decl.h>
  43 #include <asm/tsi108_pci.h>
  44 #include <asm/tsi108_irq.h>
  45 #include <asm/mpic.h>
  46
  47 #undef DEBUG
  48 #ifdef DEBUG
  49 #define DBG(fmt...) do { printk(fmt); } while(0)
  50 #else
  51 #define DBG(fmt...) do { } while(0)
  52 #endif
  53
  54 #define MPC7448HPC2_PCI_CFG_PHYS 0xfb000000
  55
  56 extern void _nmask_and_or_msr(unsigned long nmask, unsigned long or_val);
  57
  58 int mpc7448_hpc2_exclude_device(struct pci_controller *hose,
  59                                 u_char bus, u_char devfn)
  60 {
  61         if (bus == 0 && PCI_SLOT(devfn) == 0)
  62                 return PCIBIOS_DEVICE_NOT_FOUND;
  63         else
  64                 return PCIBIOS_SUCCESSFUL;
  65 }
  66
  67 static void __init mpc7448_hpc2_setup_arch(void)
  68 {
  69         struct device_node *np;
  70         if (ppc_md.progress)
  71                 ppc_md.progress("mpc7448_hpc2_setup_arch():set_bridge", 0);
  72
  73         tsi108_csr_vir_base = get_vir_csrbase();
  74
  75         /* setup PCI host bridge */
  76 #ifdef CONFIG_PCI
  77         for_each_compatible_node(np, "pci", "tsi108-pci")
  78                 tsi108_setup_pci(np, MPC7448HPC2_PCI_CFG_PHYS, 0);
  79
  80         ppc_md.pci_exclude_device = mpc7448_hpc2_exclude_device;
  81         if (ppc_md.progress)
  82                 ppc_md.progress("tsi108: resources set", 0x100);
  83 #endif
  84
  85         printk(KERN_INFO "MPC7448HPC2 (TAIGA) Platform\n");
  86         printk(KERN_INFO
  87                "Jointly ported by Freescale and Tundra Semiconductor\n");
  88         printk(KERN_INFO
  89                "Enabling L2 cache then enabling the HID0 prefetch engine.\n");
  90 }
  91
  92 /*
  93  * Interrupt setup and service.  Interrupts on the mpc7448_hpc2 come
  94  * from the four external INT pins, PCI interrupts are routed via
  95  * PCI interrupt control registers, it generates internal IRQ23
  96  *
  97  * Interrupt routing on the Taiga Board:
  98  * TSI108:PB_INT[0] -> CPU0:INT#
  99  * TSI108:PB_INT[1] -> CPU0:MCP#
 100  * TSI108:PB_INT[2] -> N/C
 101  * TSI108:PB_INT[3] -> N/C
 102  */
 103 static void __init mpc7448_hpc2_init_IRQ(void)
 104 {
 105         struct mpic *mpic;
 106         phys_addr_t mpic_paddr = 0;
 107         struct device_node *tsi_pic;
 108 #ifdef CONFIG_PCI
 109         unsigned int cascade_pci_irq;
 110         struct device_node *tsi_pci;
 111         struct device_node *cascade_node = NULL;
 112 #endif
 113
 114         tsi_pic = of_find_node_by_type(NULL, "open-pic");
 115         if (tsi_pic) {
 116                 unsigned int size;
 117                 const void *prop = of_get_property(tsi_pic, "reg", &size);
 118                 mpic_paddr = of_translate_address(tsi_pic, prop);
 119         }
 120
 121         if (mpic_paddr == 0) {
 122                 printk("%s: No tsi108 PIC found !\n", __FUNCTION__);
 123                 return;
 124         }
 125
 126         DBG("%s: tsi108 pic phys_addr = 0x%x\n", __FUNCTION__,
 127             (u32) mpic_paddr);
 128
 129         mpic = mpic_alloc(tsi_pic, mpic_paddr,
 130                         MPIC_PRIMARY | MPIC_BIG_ENDIAN | MPIC_WANTS_RESET |
 131                         MPIC_SPV_EOI | MPIC_NO_PTHROU_DIS | MPIC_REGSET_TSI108,
 132                         24,
 133                         NR_IRQS-4, /* num_sources used */
 134                         "Tsi108_PIC");
 135
 136         BUG_ON(mpic == NULL);
 137
 138         mpic_assign_isu(mpic, 0, mpic_paddr + 0x100);
 139
 140         mpic_init(mpic);
 141
 142 #ifdef CONFIG_PCI
 143         tsi_pci = of_find_node_by_type(NULL, "pci");
 144         if (tsi_pci == NULL) {
 145                 printk("%s: No tsi108 pci node found !\n", __FUNCTION__);
 146                 return;
 147         }
 148         cascade_node = of_find_node_by_type(NULL, "pic-router");
 149         if (cascade_node == NULL) {
 150                 printk("%s: No tsi108 pci cascade node found !\n", __FUNCTION__);
 151                 return;
 152         }
 153
 154         cascade_pci_irq = irq_of_parse_and_map(tsi_pci, 0);
 155         DBG("%s: tsi108 cascade_pci_irq = 0x%x\n", __FUNCTION__,
 156             (u32) cascade_pci_irq);
 157         tsi108_pci_int_init(cascade_node);
 158         set_irq_data(cascade_pci_irq, mpic);
 159         set_irq_chained_handler(cascade_pci_irq, tsi108_irq_cascade);
 160 #endif
 161         /* Configure MPIC outputs to CPU0 */
 162         tsi108_write_reg(TSI108_MPIC_OFFSET + 0x30c, 0);
 163         of_node_put(tsi_pic);
 164 }
 165
 166 void mpc7448_hpc2_show_cpuinfo(struct seq_file *m)
 167 {
 168         seq_printf(m, "vendor\t\t: Freescale Semiconductor\n");
 169         seq_printf(m, "machine\t\t: MPC7448hpc2\n");
 170 }
 171
 172 void mpc7448_hpc2_restart(char *cmd)
 173 {
 174         local_irq_disable();
 175
 176         /* Set exception prefix high - to the firmware */
 177         _nmask_and_or_msr(0, MSR_IP);
 178
 179         for (;;) ;              /* Spin until reset happens */
 180 }
 181
 182 void mpc7448_hpc2_power_off(void)
 183 {
 184         local_irq_disable();
 185         for (;;) ;              /* No way to shut power off with software */
 186 }
 187
 188 void mpc7448_hpc2_halt(void)
 189 {
 190         mpc7448_hpc2_power_off();
 191 }
 192
 193 /*
 194  * Called very early, device-tree isn't unflattened
 195  */
 196 static int __init mpc7448_hpc2_probe(void)
 197 {
 198         unsigned long root = of_get_flat_dt_root();
 199
 200         if (!of_flat_dt_is_compatible(root, "mpc74xx"))
 201                 return 0;
 202         return 1;
 203 }
 204
 205 static int mpc7448_machine_check_exception(struct pt_regs *regs)
 206 {
 207         const struct exception_table_entry *entry;
 208
 209         /* Are we prepared to handle this fault */
 210         if ((entry = search_exception_tables(regs->nip)) != NULL) {
 211                 tsi108_clear_pci_cfg_error();
 212                 regs->msr |= MSR_RI;
 213                 regs->nip = entry->fixup;
 214                 return 1;
 215         }
 216         return 0;
 217 }
 218
 219 define_machine(mpc7448_hpc2){
 220         .name                   = "MPC7448 HPC2",
 221         .probe                  = mpc7448_hpc2_probe,
 222         .setup_arch             = mpc7448_hpc2_setup_arch,
 223         .init_IRQ               = mpc7448_hpc2_init_IRQ,
 224         .show_cpuinfo           = mpc7448_hpc2_show_cpuinfo,
 225         .get_irq                = mpic_get_irq,
 226         .restart                = mpc7448_hpc2_restart,
 227         .calibrate_decr         = generic_calibrate_decr,
 228         .machine_check_exception= mpc7448_machine_check_exception,
 229         .progress               = udbg_progress,
 230 };