arch/powerpc/platforms/embedded6xx/holly.c

   1 /*
   2  * Board setup routines for the IBM 750GX/CL platform w/ TSI10x bridge
   3  *
   4  * Copyright 2007 IBM Corporation
   5  *
   6  * Stephen Winiecki <stevewin@us.ibm.com>
   7  * Josh Boyer <jwboyer@linux.vnet.ibm.com>
   8  *
   9  * Based on code from mpc7448_hpc2.c
  10  *
  11  * This program is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU General Public License
  13  * version 2 as published by the Free Software Foundation.
  14  */
  15
  16 #include <linux/stddef.h>
  17 #include <linux/kernel.h>
  18 #include <linux/pci.h>
  19 #include <linux/kdev_t.h>
  20 #include <linux/console.h>
  21 #include <linux/delay.h>
  22 #include <linux/irq.h>
  23 #include <linux/seq_file.h>
  24 #include <linux/root_dev.h>
  25 #include <linux/serial.h>
  26 #include <linux/tty.h>
  27 #include <linux/serial_core.h>
  28 #include <linux/of_platform.h>
  29 #include <linux/module.h>
  30
  31 #include <asm/system.h>
  32 #include <asm/time.h>
  33 #include <asm/machdep.h>
  34 #include <asm/prom.h>
  35 #include <asm/udbg.h>
  36 #include <asm/tsi108.h>
  37 #include <asm/pci-bridge.h>
  38 #include <asm/reg.h>
  39 #include <mm/mmu_decl.h>
  40 #include <asm/tsi108_irq.h>
  41 #include <asm/tsi108_pci.h>
  42 #include <asm/mpic.h>
  43
  44 #undef DEBUG
  45
  46 #define HOLLY_PCI_CFG_PHYS 0x7c000000
  47
  48 int holly_exclude_device(struct pci_controller *hose, u_char bus, u_char devfn)
  49 {
  50         if (bus == 0 && PCI_SLOT(devfn) == 0)
  51                 return PCIBIOS_DEVICE_NOT_FOUND;
  52         else
  53                 return PCIBIOS_SUCCESSFUL;
  54 }
  55
  56 static void holly_remap_bridge(void)
  57 {
  58         u32 lut_val, lut_addr;
  59         int i;
  60
  61         printk(KERN_INFO "Remapping PCI bridge\n");
  62
  63         /* Re-init the PCI bridge and LUT registers to have mappings that don't
  64          * rely on PIBS
  65          */
  66         lut_addr = 0x900;
  67         for (i = 0; i < 31; i++) {
  68                 tsi108_write_reg(TSI108_PB_OFFSET + lut_addr, 0x00000201);
  69                 lut_addr += 4;
  70                 tsi108_write_reg(TSI108_PB_OFFSET + lut_addr, 0x0);
  71                 lut_addr += 4;
  72         }
  73
  74         /* Reserve the last LUT entry for PCI I/O space */
  75         tsi108_write_reg(TSI108_PB_OFFSET + lut_addr, 0x00000241);
  76         lut_addr += 4;
  77         tsi108_write_reg(TSI108_PB_OFFSET + lut_addr, 0x0);
  78
  79         /* Map PCI I/O space */
  80         tsi108_write_reg(TSI108_PCI_PFAB_IO_UPPER, 0x0);
  81         tsi108_write_reg(TSI108_PCI_PFAB_IO, 0x1);
  82
  83         /* Map PCI CFG space */
  84         tsi108_write_reg(TSI108_PCI_PFAB_BAR0_UPPER, 0x0);
  85         tsi108_write_reg(TSI108_PCI_PFAB_BAR0, 0x7c000000 | 0x01);
  86
  87         /* We don't need MEM32 and PRM remapping so disable them */
  88         tsi108_write_reg(TSI108_PCI_PFAB_MEM32, 0x0);
  89         tsi108_write_reg(TSI108_PCI_PFAB_PFM3, 0x0);
  90         tsi108_write_reg(TSI108_PCI_PFAB_PFM4, 0x0);
  91
  92         /* Set P2O_BAR0 */
  93         tsi108_write_reg(TSI108_PCI_P2O_BAR0_UPPER, 0x0);
  94         tsi108_write_reg(TSI108_PCI_P2O_BAR0, 0xc0000000);
  95
  96         /* Init the PCI LUTs to do no remapping */
  97         lut_addr = 0x500;
  98         lut_val = 0x00000002;
  99
 100         for (i = 0; i < 32; i++) {
 101                 tsi108_write_reg(TSI108_PCI_OFFSET + lut_addr, lut_val);
 102                 lut_addr += 4;
 103                 tsi108_write_reg(TSI108_PCI_OFFSET + lut_addr, 0x40000000);
 104                 lut_addr += 4;
 105                 lut_val += 0x02000000;
 106         }
 107         tsi108_write_reg(TSI108_PCI_P2O_PAGE_SIZES, 0x00007900);
 108
 109         /* Set 64-bit PCI bus address for system memory */
 110         tsi108_write_reg(TSI108_PCI_P2O_BAR2_UPPER, 0x0);
 111         tsi108_write_reg(TSI108_PCI_P2O_BAR2, 0x0);
 112 }
 113
 114 static void __init holly_setup_arch(void)
 115 {
 116         struct device_node *np;
 117
 118         if (ppc_md.progress)
 119                 ppc_md.progress("holly_setup_arch():set_bridge", 0);
 120
 121         tsi108_csr_vir_base = get_vir_csrbase();
 122
 123         /* setup PCI host bridge */
 124         holly_remap_bridge();
 125
 126         np = of_find_node_by_type(NULL, "pci");
 127         if (np)
 128                 tsi108_setup_pci(np, HOLLY_PCI_CFG_PHYS, 1);
 129
 130         ppc_md.pci_exclude_device = holly_exclude_device;
 131         if (ppc_md.progress)
 132                 ppc_md.progress("tsi108: resources set", 0x100);
 133
 134         printk(KERN_INFO "PPC750GX/CL Platform\n");
 135 }
 136
 137 /*
 138  * Interrupt setup and service.  Interrupts on the holly come
 139  * from the four external INT pins, PCI interrupts are routed via
 140  * PCI interrupt control registers, it generates internal IRQ23
 141  *
 142  * Interrupt routing on the Holly Board:
 143  * TSI108:PB_INT[0] -> CPU0:INT#
 144  * TSI108:PB_INT[1] -> CPU0:MCP#
 145  * TSI108:PB_INT[2] -> N/C
 146  * TSI108:PB_INT[3] -> N/C
 147  */
 148 static void __init holly_init_IRQ(void)
 149 {
 150         struct mpic *mpic;
 151 #ifdef CONFIG_PCI
 152         unsigned int cascade_pci_irq;
 153         struct device_node *tsi_pci;
 154         struct device_node *cascade_node = NULL;
 155 #endif
 156
 157         mpic = mpic_alloc(NULL, 0,
 158                         MPIC_BIG_ENDIAN | MPIC_WANTS_RESET |
 159                         MPIC_SPV_EOI | MPIC_NO_PTHROU_DIS | MPIC_REGSET_TSI108,
 160                         24,
 161                         NR_IRQS-4, /* num_sources used */
 162                         "Tsi108_PIC");
 163
 164         BUG_ON(mpic == NULL);
 165
 166         mpic_assign_isu(mpic, 0, mpic->paddr + 0x100);
 167
 168         mpic_init(mpic);
 169
 170 #ifdef CONFIG_PCI
 171         tsi_pci = of_find_node_by_type(NULL, "pci");
 172         if (tsi_pci == NULL) {
 173                 printk(KERN_ERR "%s: No tsi108 pci node found !\n", __func__);
 174                 return;
 175         }
 176
 177         cascade_node = of_find_node_by_type(NULL, "pic-router");
 178         if (cascade_node == NULL) {
 179                 printk(KERN_ERR "%s: No tsi108 pci cascade node found !\n", __func__);
 180                 return;
 181         }
 182
 183         cascade_pci_irq = irq_of_parse_and_map(tsi_pci, 0);
 184         pr_debug("%s: tsi108 cascade_pci_irq = 0x%x\n", __func__, (u32) cascade_pci_irq);
 185         tsi108_pci_int_init(cascade_node);
 186         irq_set_handler_data(cascade_pci_irq, mpic);
 187         irq_set_chained_handler(cascade_pci_irq, tsi108_irq_cascade);
 188 #endif
 189         /* Configure MPIC outputs to CPU0 */
 190         tsi108_write_reg(TSI108_MPIC_OFFSET + 0x30c, 0);
 191 }
 192
 193 void holly_show_cpuinfo(struct seq_file *m)
 194 {
 195         seq_printf(m, "vendor\t\t: IBM\n");
 196         seq_printf(m, "machine\t\t: PPC750 GX/CL\n");
 197 }
 198
 199 void holly_restart(char *cmd)
 200 {
 201         __be32 __iomem *ocn_bar1 = NULL;
 202         unsigned long bar;
 203         struct device_node *bridge = NULL;
 204         const void *prop;
 205         int size;
 206         phys_addr_t addr = 0xc0000000;
 207
 208         local_irq_disable();
 209
 210         bridge = of_find_node_by_type(NULL, "tsi-bridge");
 211         if (bridge) {
 212                 prop = of_get_property(bridge, "reg", &size);
 213                 addr = of_translate_address(bridge, prop);
 214         }
 215         addr += (TSI108_PB_OFFSET + 0x414);
 216
 217         ocn_bar1 = ioremap(addr, 0x4);
 218
 219         /* Turn on the BOOT bit so the addresses are correctly
 220          * routed to the HLP interface */
 221         bar = ioread32be(ocn_bar1);
 222         bar |= 2;
 223         iowrite32be(bar, ocn_bar1);
 224         iosync();
 225
 226         /* Set SRR0 to the reset vector and turn on MSR_IP */
 227         mtspr(SPRN_SRR0, 0xfff00100);
 228         mtspr(SPRN_SRR1, MSR_IP);
 229
 230         /* Do an rfi to jump back to firmware.  Somewhat evil,
 231          * but it works
 232          */
 233         __asm__ __volatile__("rfi" : : : "memory");
 234
 235         /* Spin until reset happens.  Shouldn't really get here */
 236         for (;;) ;
 237 }
 238
 239 void holly_power_off(void)
 240 {
 241         local_irq_disable();
 242         /* No way to shut power off with software */
 243         for (;;) ;
 244 }
 245
 246 void holly_halt(void)
 247 {
 248         holly_power_off();
 249 }
 250
 251 /*
 252  * Called very early, device-tree isn't unflattened
 253  */
 254 static int __init holly_probe(void)
 255 {
 256         unsigned long root = of_get_flat_dt_root();
 257
 258         if (!of_flat_dt_is_compatible(root, "ibm,holly"))
 259                 return 0;
 260         return 1;
 261 }
 262
 263 static int ppc750_machine_check_exception(struct pt_regs *regs)
 264 {
 265         const struct exception_table_entry *entry;
 266
 267         /* Are we prepared to handle this fault */
 268         if ((entry = search_exception_tables(regs->nip)) != NULL) {
 269                 tsi108_clear_pci_cfg_error();
 270                 regs->msr |= MSR_RI;
 271                 regs->nip = entry->fixup;
 272                 return 1;
 273         }
 274         return 0;
 275 }
 276
 277 define_machine(holly){
 278         .name                           = "PPC750 GX/CL TSI",
 279         .probe                          = holly_probe,
 280         .setup_arch                     = holly_setup_arch,
 281         .init_IRQ                       = holly_init_IRQ,
 282         .show_cpuinfo                   = holly_show_cpuinfo,
 283         .get_irq                        = mpic_get_irq,
 284         .restart                        = holly_restart,
 285         .calibrate_decr                 = generic_calibrate_decr,
 286         .machine_check_exception        = ppc750_machine_check_exception,
 287         .progress                       = udbg_progress,
 288 };