platforms/maple/setup.c

0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /*
0003  *  Maple (970 eval board) setup code
0004  *
0005  *  (c) Copyright 2004 Benjamin Herrenschmidt (benh@kernel.crashing.org),
0006  *                     IBM Corp.
0007  */
0008
0009 #undef DEBUG
0010
0011 #include <linux/init.h>
0012 #include <linux/errno.h>
0013 #include <linux/sched.h>
0014 #include <linux/kernel.h>
0015 #include <linux/export.h>
0016 #include <linux/mm.h>
0017 #include <linux/stddef.h>
0018 #include <linux/unistd.h>
0019 #include <linux/ptrace.h>
0020 #include <linux/user.h>
0021 #include <linux/tty.h>
0022 #include <linux/string.h>
0023 #include <linux/delay.h>
0024 #include <linux/ioport.h>
0025 #include <linux/major.h>
0026 #include <linux/initrd.h>
0027 #include <linux/vt_kern.h>
0028 #include <linux/console.h>
0029 #include <linux/pci.h>
0030 #include <linux/adb.h>
0031 #include <linux/cuda.h>
0032 #include <linux/pmu.h>
0033 #include <linux/irq.h>
0034 #include <linux/seq_file.h>
0035 #include <linux/root_dev.h>
0036 #include <linux/serial.h>
0037 #include <linux/smp.h>
0038 #include <linux/bitops.h>
0039 #include <linux/of_address.h>
0040 #include <linux/of_device.h>
0041 #include <linux/memblock.h>
0042
0043 #include <asm/processor.h>
0044 #include <asm/sections.h>
0045 #include <asm/io.h>
0046 #include <asm/pci-bridge.h>
0047 #include <asm/iommu.h>
0048 #include <asm/machdep.h>
0049 #include <asm/dma.h>
0050 #include <asm/cputable.h>
0051 #include <asm/time.h>
0052 #include <asm/mpic.h>
0053 #include <asm/rtas.h>
0054 #include <asm/udbg.h>
0055 #include <asm/nvram.h>
0056
0057 #include "maple.h"
0058
0059 #ifdef DEBUG
0060 #define DBG(fmt...) udbg_printf(fmt)
0061 #else
0062 #define DBG(fmt...)
0063 #endif
0064
0065 static unsigned long maple_find_nvram_base(void)
0066 {
0067     struct device_node *rtcs;
0068     unsigned long result = 0;
0069
0070     /* find NVRAM device */
0071     rtcs = of_find_compatible_node(NULL, "nvram", "AMD8111");
0072     if (rtcs) {
0073         struct resource r;
0074         if (of_address_to_resource(rtcs, 0, &r)) {
0075             printk(KERN_EMERG "Maple: Unable to translate NVRAM"
0076                    " address\n");
0077             goto bail;
0078         }
0079         if (!(r.flags & IORESOURCE_IO)) {
0080             printk(KERN_EMERG "Maple: NVRAM address isn't PIO!\n");
0081             goto bail;
0082         }
0083         result = r.start;
0084     } else
0085         printk(KERN_EMERG "Maple: Unable to find NVRAM\n");
0086  bail:
0087     of_node_put(rtcs);
0088     return result;
0089 }
0090
0091 static void __noreturn maple_restart(char *cmd)
0092 {
0093     unsigned int maple_nvram_base;
0094     const unsigned int *maple_nvram_offset, *maple_nvram_command;
0095     struct device_node *sp;
0096
0097     maple_nvram_base = maple_find_nvram_base();
0098     if (maple_nvram_base == 0)
0099         goto fail;
0100
0101     /* find service processor device */
0102     sp = of_find_node_by_name(NULL, "service-processor");
0103     if (!sp) {
0104         printk(KERN_EMERG "Maple: Unable to find Service Processor\n");
0105         goto fail;
0106     }
0107     maple_nvram_offset = of_get_property(sp, "restart-addr", NULL);
0108     maple_nvram_command = of_get_property(sp, "restart-value", NULL);
0109     of_node_put(sp);
0110
0111     /* send command */
0112     outb_p(*maple_nvram_command, maple_nvram_base + *maple_nvram_offset);
0113     for (;;) ;
0114  fail:
0115     printk(KERN_EMERG "Maple: Manual Restart Required\n");
0116     for (;;) ;
0117 }
0118
0119 static void __noreturn maple_power_off(void)
0120 {
0121     unsigned int maple_nvram_base;
0122     const unsigned int *maple_nvram_offset, *maple_nvram_command;
0123     struct device_node *sp;
0124
0125     maple_nvram_base = maple_find_nvram_base();
0126     if (maple_nvram_base == 0)
0127         goto fail;
0128
0129     /* find service processor device */
0130     sp = of_find_node_by_name(NULL, "service-processor");
0131     if (!sp) {
0132         printk(KERN_EMERG "Maple: Unable to find Service Processor\n");
0133         goto fail;
0134     }
0135     maple_nvram_offset = of_get_property(sp, "power-off-addr", NULL);
0136     maple_nvram_command = of_get_property(sp, "power-off-value", NULL);
0137     of_node_put(sp);
0138
0139     /* send command */
0140     outb_p(*maple_nvram_command, maple_nvram_base + *maple_nvram_offset);
0141     for (;;) ;
0142  fail:
0143     printk(KERN_EMERG "Maple: Manual Power-Down Required\n");
0144     for (;;) ;
0145 }
0146
0147 static void __noreturn maple_halt(void)
0148 {
0149     maple_power_off();
0150 }
0151
0152 #ifdef CONFIG_SMP
0153 static struct smp_ops_t maple_smp_ops = {
0154     .probe      = smp_mpic_probe,
0155     .message_pass   = smp_mpic_message_pass,
0156     .kick_cpu   = smp_generic_kick_cpu,
0157     .setup_cpu  = smp_mpic_setup_cpu,
0158     .give_timebase  = smp_generic_give_timebase,
0159     .take_timebase  = smp_generic_take_timebase,
0160 };
0161 #endif /* CONFIG_SMP */
0162
0163 static void __init maple_use_rtas_reboot_and_halt_if_present(void)
0164 {
0165     if (rtas_service_present("system-reboot") &&
0166         rtas_service_present("power-off")) {
0167         ppc_md.restart = rtas_restart;
0168         pm_power_off = rtas_power_off;
0169         ppc_md.halt = rtas_halt;
0170     }
0171 }
0172
0173 static void __init maple_setup_arch(void)
0174 {
0175     /* init to some ~sane value until calibrate_delay() runs */
0176     loops_per_jiffy = 50000000;
0177
0178     /* Setup SMP callback */
0179 #ifdef CONFIG_SMP
0180     smp_ops = &maple_smp_ops;
0181 #endif
0182     maple_use_rtas_reboot_and_halt_if_present();
0183
0184     printk(KERN_DEBUG "Using native/NAP idle loop\n");
0185
0186     mmio_nvram_init();
0187 }
0188
0189 /*
0190  * This is almost identical to pSeries and CHRP. We need to make that
0191  * code generic at one point, with appropriate bits in the device-tree to
0192  * identify the presence of an HT APIC
0193  */
0194 static void __init maple_init_IRQ(void)
0195 {
0196     struct device_node *root, *np, *mpic_node = NULL;
0197     const unsigned int *opprop;
0198     unsigned long openpic_addr = 0;
0199     int naddr, n, i, opplen, has_isus = 0;
0200     struct mpic *mpic;
0201     unsigned int flags = 0;
0202
0203     /* Locate MPIC in the device-tree. Note that there is a bug
0204      * in Maple device-tree where the type of the controller is
0205      * open-pic and not interrupt-controller
0206      */
0207
0208     for_each_node_by_type(np, "interrupt-controller")
0209         if (of_device_is_compatible(np, "open-pic")) {
0210             mpic_node = np;
0211             break;
0212         }
0213     if (mpic_node == NULL)
0214         for_each_node_by_type(np, "open-pic") {
0215             mpic_node = np;
0216             break;
0217         }
0218     if (mpic_node == NULL) {
0219         printk(KERN_ERR
0220                "Failed to locate the MPIC interrupt controller\n");
0221         return;
0222     }
0223
0224     /* Find address list in /platform-open-pic */
0225     root = of_find_node_by_path("/");
0226     naddr = of_n_addr_cells(root);
0227     opprop = of_get_property(root, "platform-open-pic", &opplen);
0228     if (opprop) {
0229         openpic_addr = of_read_number(opprop, naddr);
0230         has_isus = (opplen > naddr);
0231         printk(KERN_DEBUG "OpenPIC addr: %lx, has ISUs: %d\n",
0232                openpic_addr, has_isus);
0233     }
0234
0235     BUG_ON(openpic_addr == 0);
0236
0237     /* Check for a big endian MPIC */
0238     if (of_get_property(np, "big-endian", NULL) != NULL)
0239         flags |= MPIC_BIG_ENDIAN;
0240
0241     /* XXX Maple specific bits */
0242     flags |= MPIC_U3_HT_IRQS;
0243     /* All U3/U4 are big-endian, older SLOF firmware doesn't encode this */
0244     flags |= MPIC_BIG_ENDIAN;
0245
0246     /* Setup the openpic driver. More device-tree junks, we hard code no
0247      * ISUs for now. I'll have to revisit some stuffs with the folks doing
0248      * the firmware for those
0249      */
0250     mpic = mpic_alloc(mpic_node, openpic_addr, flags,
0251               /*has_isus ? 16 :*/ 0, 0, " MPIC     ");
0252     BUG_ON(mpic == NULL);
0253
0254     /* Add ISUs */
0255     opplen /= sizeof(u32);
0256     for (n = 0, i = naddr; i < opplen; i += naddr, n++) {
0257         unsigned long isuaddr = of_read_number(opprop + i, naddr);
0258         mpic_assign_isu(mpic, n, isuaddr);
0259     }
0260
0261     /* All ISUs are setup, complete initialization */
0262     mpic_init(mpic);
0263     ppc_md.get_irq = mpic_get_irq;
0264     of_node_put(mpic_node);
0265     of_node_put(root);
0266 }
0267
0268 static void __init maple_progress(char *s, unsigned short hex)
0269 {
0270     printk("*** %04x : %s\n", hex, s ? s : "");
0271 }
0272
0273
0274 /*
0275  * Called very early, MMU is off, device-tree isn't unflattened
0276  */
0277 static int __init maple_probe(void)
0278 {
0279     if (!of_machine_is_compatible("Momentum,Maple") &&
0280         !of_machine_is_compatible("Momentum,Apache"))
0281         return 0;
0282
0283     pm_power_off = maple_power_off;
0284
0285     iommu_init_early_dart(&maple_pci_controller_ops);
0286
0287     return 1;
0288 }
0289
0290 #ifdef CONFIG_EDAC
0291 /*
0292  * Register a platform device for CPC925 memory controller on
0293  * all boards with U3H (CPC925) bridge.
0294  */
0295 static int __init maple_cpc925_edac_setup(void)
0296 {
0297     struct platform_device *pdev;
0298     struct device_node *np = NULL;
0299     struct resource r;
0300     int ret;
0301     volatile void __iomem *mem;
0302     u32 rev;
0303
0304     np = of_find_node_by_type(NULL, "memory-controller");
0305     if (!np) {
0306         printk(KERN_ERR "%s: Unable to find memory-controller node\n",
0307             __func__);
0308         return -ENODEV;
0309     }
0310
0311     ret = of_address_to_resource(np, 0, &r);
0312     of_node_put(np);
0313
0314     if (ret < 0) {
0315         printk(KERN_ERR "%s: Unable to get memory-controller reg\n",
0316             __func__);
0317         return -ENODEV;
0318     }
0319
0320     mem = ioremap(r.start, resource_size(&r));
0321     if (!mem) {
0322         printk(KERN_ERR "%s: Unable to map memory-controller memory\n",
0323                 __func__);
0324         return -ENOMEM;
0325     }
0326
0327     rev = __raw_readl(mem);
0328     iounmap(mem);
0329
0330     if (rev < 0x34 || rev > 0x3f) { /* U3H */
0331         printk(KERN_ERR "%s: Non-CPC925(U3H) bridge revision: %02x\n",
0332             __func__, rev);
0333         return 0;
0334     }
0335
0336     pdev = platform_device_register_simple("cpc925_edac", 0, &r, 1);
0337     if (IS_ERR(pdev))
0338         return PTR_ERR(pdev);
0339
0340     printk(KERN_INFO "%s: CPC925 platform device created\n", __func__);
0341
0342     return 0;
0343 }
0344 machine_device_initcall(maple, maple_cpc925_edac_setup);
0345 #endif
0346
0347 define_machine(maple) {
0348     .name           = "Maple",
0349     .probe          = maple_probe,
0350     .setup_arch     = maple_setup_arch,
0351     .discover_phbs      = maple_pci_init,
0352     .init_IRQ       = maple_init_IRQ,
0353     .pci_irq_fixup      = maple_pci_irq_fixup,
0354     .pci_get_legacy_ide_irq = maple_pci_get_legacy_ide_irq,
0355     .restart        = maple_restart,
0356     .halt           = maple_halt,
0357     .get_boot_time      = maple_get_boot_time,
0358     .set_rtc_time       = maple_set_rtc_time,
0359     .get_rtc_time       = maple_get_rtc_time,
0360     .calibrate_decr     = generic_calibrate_decr,
0361     .progress       = maple_progress,
0362     .power_save     = power4_idle,
0363 };