arch/powerpc/platforms/maple/setup.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  Maple (970 eval board) setup code
   4  *
   5  *  (c) Copyright 2004 Benjamin Herrenschmidt (benh@kernel.crashing.org),
   6  *                     IBM Corp.
   7  */
   8
   9 #undef DEBUG
  10
  11 #include <linux/init.h>
  12 #include <linux/errno.h>
  13 #include <linux/sched.h>
  14 #include <linux/kernel.h>
  15 #include <linux/export.h>
  16 #include <linux/mm.h>
  17 #include <linux/stddef.h>
  18 #include <linux/unistd.h>
  19 #include <linux/ptrace.h>
  20 #include <linux/user.h>
  21 #include <linux/tty.h>
  22 #include <linux/string.h>
  23 #include <linux/delay.h>
  24 #include <linux/ioport.h>
  25 #include <linux/major.h>
  26 #include <linux/initrd.h>
  27 #include <linux/vt_kern.h>
  28 #include <linux/console.h>
  29 #include <linux/pci.h>
  30 #include <linux/adb.h>
  31 #include <linux/cuda.h>
  32 #include <linux/pmu.h>
  33 #include <linux/irq.h>
  34 #include <linux/seq_file.h>
  35 #include <linux/root_dev.h>
  36 #include <linux/serial.h>
  37 #include <linux/smp.h>
  38 #include <linux/bitops.h>
  39 #include <linux/of_device.h>
  40 #include <linux/memblock.h>
  41
  42 #include <asm/processor.h>
  43 #include <asm/sections.h>
  44 #include <asm/prom.h>
  45 #include <asm/pgtable.h>
  46 #include <asm/io.h>
  47 #include <asm/pci-bridge.h>
  48 #include <asm/iommu.h>
  49 #include <asm/machdep.h>
  50 #include <asm/dma.h>
  51 #include <asm/cputable.h>
  52 #include <asm/time.h>
  53 #include <asm/mpic.h>
  54 #include <asm/rtas.h>
  55 #include <asm/udbg.h>
  56 #include <asm/nvram.h>
  57
  58 #include "maple.h"
  59
  60 #ifdef DEBUG
  61 #define DBG(fmt...) udbg_printf(fmt)
  62 #else
  63 #define DBG(fmt...)
  64 #endif
  65
  66 static unsigned long maple_find_nvram_base(void)
  67 {
  68         struct device_node *rtcs;
  69         unsigned long result = 0;
  70
  71         /* find NVRAM device */
  72         rtcs = of_find_compatible_node(NULL, "nvram", "AMD8111");
  73         if (rtcs) {
  74                 struct resource r;
  75                 if (of_address_to_resource(rtcs, 0, &r)) {
  76                         printk(KERN_EMERG "Maple: Unable to translate NVRAM"
  77                                " address\n");
  78                         goto bail;
  79                 }
  80                 if (!(r.flags & IORESOURCE_IO)) {
  81                         printk(KERN_EMERG "Maple: NVRAM address isn't PIO!\n");
  82                         goto bail;
  83                 }
  84                 result = r.start;
  85         } else
  86                 printk(KERN_EMERG "Maple: Unable to find NVRAM\n");
  87  bail:
  88         of_node_put(rtcs);
  89         return result;
  90 }
  91
  92 static void __noreturn maple_restart(char *cmd)
  93 {
  94         unsigned int maple_nvram_base;
  95         const unsigned int *maple_nvram_offset, *maple_nvram_command;
  96         struct device_node *sp;
  97
  98         maple_nvram_base = maple_find_nvram_base();
  99         if (maple_nvram_base == 0)
 100                 goto fail;
 101
 102         /* find service processor device */
 103         sp = of_find_node_by_name(NULL, "service-processor");
 104         if (!sp) {
 105                 printk(KERN_EMERG "Maple: Unable to find Service Processor\n");
 106                 goto fail;
 107         }
 108         maple_nvram_offset = of_get_property(sp, "restart-addr", NULL);
 109         maple_nvram_command = of_get_property(sp, "restart-value", NULL);
 110         of_node_put(sp);
 111
 112         /* send command */
 113         outb_p(*maple_nvram_command, maple_nvram_base + *maple_nvram_offset);
 114         for (;;) ;
 115  fail:
 116         printk(KERN_EMERG "Maple: Manual Restart Required\n");
 117         for (;;) ;
 118 }
 119
 120 static void __noreturn maple_power_off(void)
 121 {
 122         unsigned int maple_nvram_base;
 123         const unsigned int *maple_nvram_offset, *maple_nvram_command;
 124         struct device_node *sp;
 125
 126         maple_nvram_base = maple_find_nvram_base();
 127         if (maple_nvram_base == 0)
 128                 goto fail;
 129
 130         /* find service processor device */
 131         sp = of_find_node_by_name(NULL, "service-processor");
 132         if (!sp) {
 133                 printk(KERN_EMERG "Maple: Unable to find Service Processor\n");
 134                 goto fail;
 135         }
 136         maple_nvram_offset = of_get_property(sp, "power-off-addr", NULL);
 137         maple_nvram_command = of_get_property(sp, "power-off-value", NULL);
 138         of_node_put(sp);
 139
 140         /* send command */
 141         outb_p(*maple_nvram_command, maple_nvram_base + *maple_nvram_offset);
 142         for (;;) ;
 143  fail:
 144         printk(KERN_EMERG "Maple: Manual Power-Down Required\n");
 145         for (;;) ;
 146 }
 147
 148 static void __noreturn maple_halt(void)
 149 {
 150         maple_power_off();
 151 }
 152
 153 #ifdef CONFIG_SMP
 154 static struct smp_ops_t maple_smp_ops = {
 155         .probe          = smp_mpic_probe,
 156         .message_pass   = smp_mpic_message_pass,
 157         .kick_cpu       = smp_generic_kick_cpu,
 158         .setup_cpu      = smp_mpic_setup_cpu,
 159         .give_timebase  = smp_generic_give_timebase,
 160         .take_timebase  = smp_generic_take_timebase,
 161 };
 162 #endif /* CONFIG_SMP */
 163
 164 static void __init maple_use_rtas_reboot_and_halt_if_present(void)
 165 {
 166         if (rtas_service_present("system-reboot") &&
 167             rtas_service_present("power-off")) {
 168                 ppc_md.restart = rtas_restart;
 169                 pm_power_off = rtas_power_off;
 170                 ppc_md.halt = rtas_halt;
 171         }
 172 }
 173
 174 static void __init maple_setup_arch(void)
 175 {
 176         /* init to some ~sane value until calibrate_delay() runs */
 177         loops_per_jiffy = 50000000;
 178
 179         /* Setup SMP callback */
 180 #ifdef CONFIG_SMP
 181         smp_ops = &maple_smp_ops;
 182 #endif
 183         /* Lookup PCI hosts */
 184         maple_pci_init();
 185
 186 #ifdef CONFIG_DUMMY_CONSOLE
 187         conswitchp = &dummy_con;
 188 #endif
 189         maple_use_rtas_reboot_and_halt_if_present();
 190
 191         printk(KERN_DEBUG "Using native/NAP idle loop\n");
 192
 193         mmio_nvram_init();
 194 }
 195
 196 /*
 197  * This is almost identical to pSeries and CHRP. We need to make that
 198  * code generic at one point, with appropriate bits in the device-tree to
 199  * identify the presence of an HT APIC
 200  */
 201 static void __init maple_init_IRQ(void)
 202 {
 203         struct device_node *root, *np, *mpic_node = NULL;
 204         const unsigned int *opprop;
 205         unsigned long openpic_addr = 0;
 206         int naddr, n, i, opplen, has_isus = 0;
 207         struct mpic *mpic;
 208         unsigned int flags = 0;
 209
 210         /* Locate MPIC in the device-tree. Note that there is a bug
 211          * in Maple device-tree where the type of the controller is
 212          * open-pic and not interrupt-controller
 213          */
 214
 215         for_each_node_by_type(np, "interrupt-controller")
 216                 if (of_device_is_compatible(np, "open-pic")) {
 217                         mpic_node = np;
 218                         break;
 219                 }
 220         if (mpic_node == NULL)
 221                 for_each_node_by_type(np, "open-pic") {
 222                         mpic_node = np;
 223                         break;
 224                 }
 225         if (mpic_node == NULL) {
 226                 printk(KERN_ERR
 227                        "Failed to locate the MPIC interrupt controller\n");
 228                 return;
 229         }
 230
 231         /* Find address list in /platform-open-pic */
 232         root = of_find_node_by_path("/");
 233         naddr = of_n_addr_cells(root);
 234         opprop = of_get_property(root, "platform-open-pic", &opplen);
 235         if (opprop != 0) {
 236                 openpic_addr = of_read_number(opprop, naddr);
 237                 has_isus = (opplen > naddr);
 238                 printk(KERN_DEBUG "OpenPIC addr: %lx, has ISUs: %d\n",
 239                        openpic_addr, has_isus);
 240         }
 241
 242         BUG_ON(openpic_addr == 0);
 243
 244         /* Check for a big endian MPIC */
 245         if (of_get_property(np, "big-endian", NULL) != NULL)
 246                 flags |= MPIC_BIG_ENDIAN;
 247
 248         /* XXX Maple specific bits */
 249         flags |= MPIC_U3_HT_IRQS;
 250         /* All U3/U4 are big-endian, older SLOF firmware doesn't encode this */
 251         flags |= MPIC_BIG_ENDIAN;
 252
 253         /* Setup the openpic driver. More device-tree junks, we hard code no
 254          * ISUs for now. I'll have to revisit some stuffs with the folks doing
 255          * the firmware for those
 256          */
 257         mpic = mpic_alloc(mpic_node, openpic_addr, flags,
 258                           /*has_isus ? 16 :*/ 0, 0, " MPIC     ");
 259         BUG_ON(mpic == NULL);
 260
 261         /* Add ISUs */
 262         opplen /= sizeof(u32);
 263         for (n = 0, i = naddr; i < opplen; i += naddr, n++) {
 264                 unsigned long isuaddr = of_read_number(opprop + i, naddr);
 265                 mpic_assign_isu(mpic, n, isuaddr);
 266         }
 267
 268         /* All ISUs are setup, complete initialization */
 269         mpic_init(mpic);
 270         ppc_md.get_irq = mpic_get_irq;
 271         of_node_put(mpic_node);
 272         of_node_put(root);
 273 }
 274
 275 static void __init maple_progress(char *s, unsigned short hex)
 276 {
 277         printk("*** %04x : %s\n", hex, s ? s : "");
 278 }
 279
 280
 281 /*
 282  * Called very early, MMU is off, device-tree isn't unflattened
 283  */
 284 static int __init maple_probe(void)
 285 {
 286         if (!of_machine_is_compatible("Momentum,Maple") &&
 287             !of_machine_is_compatible("Momentum,Apache"))
 288                 return 0;
 289
 290         pm_power_off = maple_power_off;
 291
 292         iommu_init_early_dart(&maple_pci_controller_ops);
 293
 294         return 1;
 295 }
 296
 297 #ifdef CONFIG_EDAC
 298 /*
 299  * Register a platform device for CPC925 memory controller on
 300  * all boards with U3H (CPC925) bridge.
 301  */
 302 static int __init maple_cpc925_edac_setup(void)
 303 {
 304         struct platform_device *pdev;
 305         struct device_node *np = NULL;
 306         struct resource r;
 307         int ret;
 308         volatile void __iomem *mem;
 309         u32 rev;
 310
 311         np = of_find_node_by_type(NULL, "memory-controller");
 312         if (!np) {
 313                 printk(KERN_ERR "%s: Unable to find memory-controller node\n",
 314                         __func__);
 315                 return -ENODEV;
 316         }
 317
 318         ret = of_address_to_resource(np, 0, &r);
 319         of_node_put(np);
 320
 321         if (ret < 0) {
 322                 printk(KERN_ERR "%s: Unable to get memory-controller reg\n",
 323                         __func__);
 324                 return -ENODEV;
 325         }
 326
 327         mem = ioremap(r.start, resource_size(&r));
 328         if (!mem) {
 329                 printk(KERN_ERR "%s: Unable to map memory-controller memory\n",
 330                                 __func__);
 331                 return -ENOMEM;
 332         }
 333
 334         rev = __raw_readl(mem);
 335         iounmap(mem);
 336
 337         if (rev < 0x34 || rev > 0x3f) { /* U3H */
 338                 printk(KERN_ERR "%s: Non-CPC925(U3H) bridge revision: %02x\n",
 339                         __func__, rev);
 340                 return 0;
 341         }
 342
 343         pdev = platform_device_register_simple("cpc925_edac", 0, &r, 1);
 344         if (IS_ERR(pdev))
 345                 return PTR_ERR(pdev);
 346
 347         printk(KERN_INFO "%s: CPC925 platform device created\n", __func__);
 348
 349         return 0;
 350 }
 351 machine_device_initcall(maple, maple_cpc925_edac_setup);
 352 #endif
 353
 354 define_machine(maple) {
 355         .name                   = "Maple",
 356         .probe                  = maple_probe,
 357         .setup_arch             = maple_setup_arch,
 358         .init_IRQ               = maple_init_IRQ,
 359         .pci_irq_fixup          = maple_pci_irq_fixup,
 360         .pci_get_legacy_ide_irq = maple_pci_get_legacy_ide_irq,
 361         .restart                = maple_restart,
 362         .halt                   = maple_halt,
 363         .get_boot_time          = maple_get_boot_time,
 364         .set_rtc_time           = maple_set_rtc_time,
 365         .get_rtc_time           = maple_get_rtc_time,
 366         .calibrate_decr         = generic_calibrate_decr,
 367         .progress               = maple_progress,
 368         .power_save             = power4_idle,
 369 };