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