2 * Maple (970 eval board) setup code
4 * (c) Copyright 2004 Benjamin Herrenschmidt (benh@kernel.crashing.org),
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version
10 * 2 of the License, or (at your option) any later version.
16 #include <linux/init.h>
17 #include <linux/errno.h>
18 #include <linux/sched.h>
19 #include <linux/kernel.h>
21 #include <linux/stddef.h>
22 #include <linux/unistd.h>
23 #include <linux/ptrace.h>
24 #include <linux/slab.h>
25 #include <linux/user.h>
26 #include <linux/a.out.h>
27 #include <linux/tty.h>
28 #include <linux/string.h>
29 #include <linux/delay.h>
30 #include <linux/ioport.h>
31 #include <linux/major.h>
32 #include <linux/initrd.h>
33 #include <linux/vt_kern.h>
34 #include <linux/console.h>
35 #include <linux/pci.h>
36 #include <linux/adb.h>
37 #include <linux/cuda.h>
38 #include <linux/pmu.h>
39 #include <linux/irq.h>
40 #include <linux/seq_file.h>
41 #include <linux/root_dev.h>
42 #include <linux/serial.h>
43 #include <linux/smp.h>
45 #include <asm/processor.h>
46 #include <asm/sections.h>
48 #include <asm/system.h>
49 #include <asm/pgtable.h>
50 #include <asm/bitops.h>
52 #include <asm/kexec.h>
53 #include <asm/pci-bridge.h>
54 #include <asm/iommu.h>
55 #include <asm/machdep.h>
57 #include <asm/cputable.h>
59 #include <asm/of_device.h>
64 #include <asm/nvram.h>
69 #define DBG(fmt...) udbg_printf(fmt)
74 static unsigned long maple_find_nvram_base(void)
76 struct device_node *rtcs;
77 unsigned long result = 0;
79 /* find NVRAM device */
80 rtcs = of_find_compatible_node(NULL, "nvram", "AMD8111");
83 if (of_address_to_resource(rtcs, 0, &r)) {
84 printk(KERN_EMERG "Maple: Unable to translate NVRAM"
88 if (!(r.flags & IORESOURCE_IO)) {
89 printk(KERN_EMERG "Maple: NVRAM address isn't PIO!\n");
94 printk(KERN_EMERG "Maple: Unable to find NVRAM\n");
100 static void maple_restart(char *cmd)
102 unsigned int maple_nvram_base;
103 const unsigned int *maple_nvram_offset, *maple_nvram_command;
104 struct device_node *sp;
106 maple_nvram_base = maple_find_nvram_base();
107 if (maple_nvram_base == 0)
110 /* find service processor device */
111 sp = of_find_node_by_name(NULL, "service-processor");
113 printk(KERN_EMERG "Maple: Unable to find Service Processor\n");
116 maple_nvram_offset = of_get_property(sp, "restart-addr", NULL);
117 maple_nvram_command = of_get_property(sp, "restart-value", NULL);
121 outb_p(*maple_nvram_command, maple_nvram_base + *maple_nvram_offset);
124 printk(KERN_EMERG "Maple: Manual Restart Required\n");
127 static void maple_power_off(void)
129 unsigned int maple_nvram_base;
130 const unsigned int *maple_nvram_offset, *maple_nvram_command;
131 struct device_node *sp;
133 maple_nvram_base = maple_find_nvram_base();
134 if (maple_nvram_base == 0)
137 /* find service processor device */
138 sp = of_find_node_by_name(NULL, "service-processor");
140 printk(KERN_EMERG "Maple: Unable to find Service Processor\n");
143 maple_nvram_offset = of_get_property(sp, "power-off-addr", NULL);
144 maple_nvram_command = of_get_property(sp, "power-off-value", NULL);
148 outb_p(*maple_nvram_command, maple_nvram_base + *maple_nvram_offset);
151 printk(KERN_EMERG "Maple: Manual Power-Down Required\n");
154 static void maple_halt(void)
160 struct smp_ops_t maple_smp_ops = {
161 .probe = smp_mpic_probe,
162 .message_pass = smp_mpic_message_pass,
163 .kick_cpu = smp_generic_kick_cpu,
164 .setup_cpu = smp_mpic_setup_cpu,
165 .give_timebase = smp_generic_give_timebase,
166 .take_timebase = smp_generic_take_timebase,
168 #endif /* CONFIG_SMP */
170 static void __init maple_use_rtas_reboot_and_halt_if_present(void)
172 if (rtas_service_present("system-reboot") &&
173 rtas_service_present("power-off")) {
174 ppc_md.restart = rtas_restart;
175 ppc_md.power_off = rtas_power_off;
176 ppc_md.halt = rtas_halt;
180 void __init maple_setup_arch(void)
182 /* init to some ~sane value until calibrate_delay() runs */
183 loops_per_jiffy = 50000000;
185 /* Setup SMP callback */
187 smp_ops = &maple_smp_ops;
189 /* Lookup PCI hosts */
192 #ifdef CONFIG_DUMMY_CONSOLE
193 conswitchp = &dummy_con;
195 maple_use_rtas_reboot_and_halt_if_present();
197 printk(KERN_DEBUG "Using native/NAP idle loop\n");
203 * Early initialization.
205 static void __init maple_init_early(void)
207 DBG(" -> maple_init_early\n");
209 iommu_init_early_dart();
211 DBG(" <- maple_init_early\n");
215 * This is almost identical to pSeries and CHRP. We need to make that
216 * code generic at one point, with appropriate bits in the device-tree to
217 * identify the presence of an HT APIC
219 static void __init maple_init_IRQ(void)
221 struct device_node *root, *np, *mpic_node = NULL;
222 const unsigned int *opprop;
223 unsigned long openpic_addr = 0;
224 int naddr, n, i, opplen, has_isus = 0;
226 unsigned int flags = MPIC_PRIMARY;
228 /* Locate MPIC in the device-tree. Note that there is a bug
229 * in Maple device-tree where the type of the controller is
230 * open-pic and not interrupt-controller
233 for_each_node_by_type(np, "interrupt-controller")
234 if (of_device_is_compatible(np, "open-pic")) {
238 if (mpic_node == NULL)
239 for_each_node_by_type(np, "open-pic") {
243 if (mpic_node == NULL) {
245 "Failed to locate the MPIC interrupt controller\n");
249 /* Find address list in /platform-open-pic */
250 root = of_find_node_by_path("/");
251 naddr = of_n_addr_cells(root);
252 opprop = of_get_property(root, "platform-open-pic", &opplen);
254 openpic_addr = of_read_number(opprop, naddr);
255 has_isus = (opplen > naddr);
256 printk(KERN_DEBUG "OpenPIC addr: %lx, has ISUs: %d\n",
257 openpic_addr, has_isus);
260 BUG_ON(openpic_addr == 0);
262 /* Check for a big endian MPIC */
263 if (of_get_property(np, "big-endian", NULL) != NULL)
264 flags |= MPIC_BIG_ENDIAN;
266 /* XXX Maple specific bits */
267 flags |= MPIC_U3_HT_IRQS | MPIC_WANTS_RESET;
268 /* All U3/U4 are big-endian, older SLOF firmware doesn't encode this */
269 flags |= MPIC_BIG_ENDIAN;
271 /* Setup the openpic driver. More device-tree junks, we hard code no
272 * ISUs for now. I'll have to revisit some stuffs with the folks doing
273 * the firmware for those
275 mpic = mpic_alloc(mpic_node, openpic_addr, flags,
276 /*has_isus ? 16 :*/ 0, 0, " MPIC ");
277 BUG_ON(mpic == NULL);
280 opplen /= sizeof(u32);
281 for (n = 0, i = naddr; i < opplen; i += naddr, n++) {
282 unsigned long isuaddr = of_read_number(opprop + i, naddr);
283 mpic_assign_isu(mpic, n, isuaddr);
286 /* All ISUs are setup, complete initialization */
288 ppc_md.get_irq = mpic_get_irq;
289 of_node_put(mpic_node);
293 static void __init maple_progress(char *s, unsigned short hex)
295 printk("*** %04x : %s\n", hex, s ? s : "");
300 * Called very early, MMU is off, device-tree isn't unflattened
302 static int __init maple_probe(void)
304 unsigned long root = of_get_flat_dt_root();
306 if (!of_flat_dt_is_compatible(root, "Momentum,Maple") &&
307 !of_flat_dt_is_compatible(root, "Momentum,Apache"))
310 * On U3, the DART (iommu) must be allocated now since it
311 * has an impact on htab_initialize (due to the large page it
312 * occupies having to be broken up so the DART itself is not
313 * part of the cacheable linar mapping
322 define_machine(maple_md) {
324 .probe = maple_probe,
325 .setup_arch = maple_setup_arch,
326 .init_early = maple_init_early,
327 .init_IRQ = maple_init_IRQ,
328 .pci_irq_fixup = maple_pci_irq_fixup,
329 .pci_get_legacy_ide_irq = maple_pci_get_legacy_ide_irq,
330 .restart = maple_restart,
331 .power_off = maple_power_off,
333 .get_boot_time = maple_get_boot_time,
334 .set_rtc_time = maple_set_rtc_time,
335 .get_rtc_time = maple_get_rtc_time,
336 .calibrate_decr = generic_calibrate_decr,
337 .progress = maple_progress,
338 .power_save = power4_idle,
340 .machine_kexec = default_machine_kexec,
341 .machine_kexec_prepare = default_machine_kexec_prepare,
342 .machine_crash_shutdown = default_machine_crash_shutdown,