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