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/config.h>
  22 #include <linux/stddef.h>
  23 #include <linux/kernel.h>
  24 #include <linux/pci.h>
  25 #include <linux/kdev_t.h>
  26 #include <linux/console.h>
  27 #include <linux/delay.h>
  28 #include <linux/irq.h>
  29 #include <linux/ide.h>
  30 #include <linux/seq_file.h>
  31 #include <linux/root_dev.h>
  32 #include <linux/serial.h>
  33 #include <linux/tty.h>
  34 #include <linux/serial_core.h>
  35
  36 #include <asm/system.h>
  37 #include <asm/time.h>
  38 #include <asm/machdep.h>
  39 #include <asm/prom.h>
  40 #include <asm/udbg.h>
  41 #include <asm/tsi108.h>
  42 #include <asm/pci-bridge.h>
  43 #include <asm/reg.h>
  44 #include <mm/mmu_decl.h>
  45 #include "mpc7448_hpc2.h"
  46 #include <asm/tsi108_irq.h>
  47 #include <asm/mpic.h>
  48
  49 #undef DEBUG
  50 #ifdef DEBUG
  51 #define DBG(fmt...) do { printk(fmt); } while(0)
  52 #else
  53 #define DBG(fmt...) do { } while(0)
  54 #endif
  55
  56 #ifndef CONFIG_PCI
  57 isa_io_base = MPC7448_HPC2_ISA_IO_BASE;
  58 isa_mem_base = MPC7448_HPC2_ISA_MEM_BASE;
  59 pci_dram_offset = MPC7448_HPC2_PCI_MEM_OFFSET;
  60 #endif
  61
  62 extern int tsi108_setup_pci(struct device_node *dev);
  63 extern void _nmask_and_or_msr(unsigned long nmask, unsigned long or_val);
  64 extern void tsi108_pci_int_init(void);
  65 extern void tsi108_irq_cascade(unsigned int irq, struct irq_desc *desc,
  66                             struct pt_regs *regs);
  67
  68 int mpc7448_hpc2_exclude_device(u_char bus, u_char devfn)
  69 {
  70         if (bus == 0 && PCI_SLOT(devfn) == 0)
  71                 return PCIBIOS_DEVICE_NOT_FOUND;
  72         else
  73                 return PCIBIOS_SUCCESSFUL;
  74 }
  75
  76 /*
  77  * find pci slot by devfn in interrupt map of OF tree
  78  */
  79 u8 find_slot_by_devfn(unsigned int *interrupt_map, unsigned int devfn)
  80 {
  81         int i;
  82         unsigned int tmp;
  83         for (i = 0; i < 4; i++){
  84                 tmp = interrupt_map[i*4*7];
  85                 if ((tmp >> 11) == (devfn >> 3))
  86                         return i;
  87         }
  88         return i;
  89 }
  90
  91 /*
  92  * Scans the interrupt map for pci device
  93  */
  94 void mpc7448_hpc2_fixup_irq(struct pci_dev *dev)
  95 {
  96         struct pci_controller *hose;
  97         struct device_node *node;
  98         const unsigned int *interrupt;
  99         int busnr;
 100         int len;
 101         u8 slot;
 102         u8 pin;
 103
 104         /* Lookup the hose */
 105         busnr = dev->bus->number;
 106         hose = pci_bus_to_hose(busnr);
 107         if (!hose)
 108                 printk(KERN_ERR "No pci hose found\n");
 109
 110         /* Check it has an OF node associated */
 111         node = (struct device_node *) hose->arch_data;
 112         if (!node)
 113                 printk(KERN_ERR "No pci node found\n");
 114
 115         interrupt = get_property(node, "interrupt-map", &len);
 116         slot = find_slot_by_devfn(interrupt, dev->devfn);
 117         pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
 118         if (pin == 0 || pin > 4)
 119                 pin = 1;
 120         pin--;
 121         dev->irq  = interrupt[slot*4*7 + pin*7 + 5];
 122         DBG("TSI_PCI: dev->irq = 0x%x\n", dev->irq);
 123 }
 124 /* temporary pci irq map fixup*/
 125
 126 void __init mpc7448_hpc2_pcibios_fixup(void)
 127 {
 128         struct pci_dev *dev = NULL;
 129         for_each_pci_dev(dev) {
 130                 mpc7448_hpc2_fixup_irq(dev);
 131                 pci_write_config_byte(dev, PCI_INTERRUPT_LINE, dev->irq);
 132         }
 133 }
 134
 135 static void __init mpc7448_hpc2_setup_arch(void)
 136 {
 137         struct device_node *cpu;
 138         struct device_node *np;
 139         if (ppc_md.progress)
 140                 ppc_md.progress("mpc7448_hpc2_setup_arch():set_bridge", 0);
 141
 142         cpu = of_find_node_by_type(NULL, "cpu");
 143         if (cpu != 0) {
 144                 const unsigned int *fp;
 145
 146                 fp = get_property(cpu, "clock-frequency", NULL);
 147                 if (fp != 0)
 148                         loops_per_jiffy = *fp / HZ;
 149                 else
 150                         loops_per_jiffy = 50000000 / HZ;
 151                 of_node_put(cpu);
 152         }
 153         tsi108_csr_vir_base = get_vir_csrbase();
 154
 155 #ifdef  CONFIG_ROOT_NFS
 156         ROOT_DEV = Root_NFS;
 157 #else
 158         ROOT_DEV = Root_HDA1;
 159 #endif
 160
 161 #ifdef CONFIG_BLK_DEV_INITRD
 162         ROOT_DEV = Root_RAM0;
 163 #endif
 164
 165         /* setup PCI host bridge */
 166 #ifdef CONFIG_PCI
 167         for (np = NULL; (np = of_find_node_by_type(np, "pci")) != NULL;)
 168                 tsi108_setup_pci(np);
 169
 170         ppc_md.pci_exclude_device = mpc7448_hpc2_exclude_device;
 171         if (ppc_md.progress)
 172                 ppc_md.progress("tsi108: resources set", 0x100);
 173 #endif
 174
 175         printk(KERN_INFO "MPC7448HPC2 (TAIGA) Platform\n");
 176         printk(KERN_INFO
 177                "Jointly ported by Freescale and Tundra Semiconductor\n");
 178         printk(KERN_INFO
 179                "Enabling L2 cache then enabling the HID0 prefetch engine.\n");
 180 }
 181
 182 /*
 183  * Interrupt setup and service.  Interrrupts on the mpc7448_hpc2 come
 184  * from the four external INT pins, PCI interrupts are routed via
 185  * PCI interrupt control registers, it generates internal IRQ23
 186  *
 187  * Interrupt routing on the Taiga Board:
 188  * TSI108:PB_INT[0] -> CPU0:INT#
 189  * TSI108:PB_INT[1] -> CPU0:MCP#
 190  * TSI108:PB_INT[2] -> N/C
 191  * TSI108:PB_INT[3] -> N/C
 192  */
 193 static void __init mpc7448_hpc2_init_IRQ(void)
 194 {
 195         struct mpic *mpic;
 196         phys_addr_t mpic_paddr = 0;
 197         unsigned int cascade_pci_irq;
 198         struct device_node *tsi_pci;
 199         struct device_node *tsi_pic;
 200
 201         tsi_pic = of_find_node_by_type(NULL, "open-pic");
 202         if (tsi_pic) {
 203                 unsigned int size;
 204                 void *prop = get_property(tsi_pic, "reg", &size);
 205                 mpic_paddr = of_translate_address(tsi_pic, prop);
 206         }
 207
 208         if (mpic_paddr == 0) {
 209                 printk("%s: No tsi108 PIC found !\n", __FUNCTION__);
 210                 return;
 211         }
 212
 213         DBG("%s: tsi108pic phys_addr = 0x%x\n", __FUNCTION__,
 214             (u32) mpic_paddr);
 215
 216         mpic = mpic_alloc(tsi_pic, mpic_paddr,
 217                         MPIC_PRIMARY | MPIC_BIG_ENDIAN | MPIC_WANTS_RESET |
 218                         MPIC_SPV_EOI | MPIC_NO_PTHROU_DIS | MPIC_REGSET_TSI108,
 219                         0, /* num_sources used */
 220                         0, /* num_sources used */
 221                         "Tsi108_PIC");
 222
 223         BUG_ON(mpic == NULL); /* XXXX */
 224         mpic_init(mpic);
 225
 226         tsi_pci = of_find_node_by_type(NULL, "pci");
 227         if (tsi_pci == 0) {
 228                 printk("%s: No tsi108 pci node found !\n", __FUNCTION__);
 229                 return;
 230         }
 231
 232         cascade_pci_irq = irq_of_parse_and_map(tsi_pci, 0);
 233         set_irq_data(cascade_pci_irq, mpic);
 234         set_irq_chained_handler(cascade_pci_irq, tsi108_irq_cascade);
 235
 236         tsi108_pci_int_init();
 237
 238         /* Configure MPIC outputs to CPU0 */
 239         tsi108_write_reg(TSI108_MPIC_OFFSET + 0x30c, 0);
 240         of_node_put(tsi_pic);
 241 }
 242
 243 void mpc7448_hpc2_show_cpuinfo(struct seq_file *m)
 244 {
 245         seq_printf(m, "vendor\t\t: Freescale Semiconductor\n");
 246         seq_printf(m, "machine\t\t: MPC7448hpc2\n");
 247 }
 248
 249 void mpc7448_hpc2_restart(char *cmd)
 250 {
 251         local_irq_disable();
 252
 253         /* Set exception prefix high - to the firmware */
 254         _nmask_and_or_msr(0, MSR_IP);
 255
 256         for (;;) ;              /* Spin until reset happens */
 257 }
 258
 259 void mpc7448_hpc2_power_off(void)
 260 {
 261         local_irq_disable();
 262         for (;;) ;              /* No way to shut power off with software */
 263 }
 264
 265 void mpc7448_hpc2_halt(void)
 266 {
 267         mpc7448_hpc2_power_off();
 268 }
 269
 270 /*
 271  * Called very early, device-tree isn't unflattened
 272  */
 273 static int __init mpc7448_hpc2_probe(void)
 274 {
 275         unsigned long root = of_get_flat_dt_root();
 276
 277         if (!of_flat_dt_is_compatible(root, "mpc74xx"))
 278                 return 0;
 279         return 1;
 280 }
 281
 282 static int mpc7448_machine_check_exception(struct pt_regs *regs)
 283 {
 284         extern void tsi108_clear_pci_cfg_error(void);
 285         const struct exception_table_entry *entry;
 286
 287         /* Are we prepared to handle this fault */
 288         if ((entry = search_exception_tables(regs->nip)) != NULL) {
 289                 tsi108_clear_pci_cfg_error();
 290                 regs->msr |= MSR_RI;
 291                 regs->nip = entry->fixup;
 292                 return 1;
 293         }
 294         return 0;
 295
 296 }
 297
 298 define_machine(mpc7448_hpc2){
 299         .name                   = "MPC7448 HPC2",
 300         .probe                  = mpc7448_hpc2_probe,
 301         .setup_arch             = mpc7448_hpc2_setup_arch,
 302         .init_IRQ               = mpc7448_hpc2_init_IRQ,
 303         .show_cpuinfo           = mpc7448_hpc2_show_cpuinfo,
 304         .get_irq                = mpic_get_irq,
 305         .pcibios_fixup          = mpc7448_hpc2_pcibios_fixup,
 306         .restart                = mpc7448_hpc2_restart,
 307         .calibrate_decr         = generic_calibrate_decr,
 308         .machine_check_exception= mpc7448_machine_check_exception,
 309         .progress               = udbg_progress,
 310 };