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/ide.h>
36 #include <linux/pci.h>
37 #include <linux/adb.h>
38 #include <linux/cuda.h>
39 #include <linux/pmu.h>
40 #include <linux/irq.h>
41 #include <linux/seq_file.h>
42 #include <linux/root_dev.h>
43 #include <linux/serial.h>
44 #include <linux/smp.h>
46 #include <asm/processor.h>
47 #include <asm/sections.h>
49 #include <asm/system.h>
50 #include <asm/pgtable.h>
51 #include <asm/bitops.h>
53 #include <asm/kexec.h>
54 #include <asm/pci-bridge.h>
55 #include <asm/iommu.h>
56 #include <asm/machdep.h>
58 #include <asm/cputable.h>
60 #include <asm/of_device.h>
68 #define DBG(fmt...) udbg_printf(fmt)
73 static unsigned long maple_find_nvram_base(void)
75 struct device_node *rtcs;
76 unsigned long result = 0;
78 /* find NVRAM device */
79 rtcs = of_find_compatible_node(NULL, "nvram", "AMD8111");
82 if (of_address_to_resource(rtcs, 0, &r)) {
83 printk(KERN_EMERG "Maple: Unable to translate NVRAM"
87 if (!(r.flags & IORESOURCE_IO)) {
88 printk(KERN_EMERG "Maple: NVRAM address isn't PIO!\n");
93 printk(KERN_EMERG "Maple: Unable to find NVRAM\n");
99 static void maple_restart(char *cmd)
101 unsigned int maple_nvram_base;
102 const unsigned int *maple_nvram_offset, *maple_nvram_command;
103 struct device_node *sp;
105 maple_nvram_base = maple_find_nvram_base();
106 if (maple_nvram_base == 0)
109 /* find service processor device */
110 sp = of_find_node_by_name(NULL, "service-processor");
112 printk(KERN_EMERG "Maple: Unable to find Service Processor\n");
115 maple_nvram_offset = get_property(sp, "restart-addr", NULL);
116 maple_nvram_command = get_property(sp, "restart-value", NULL);
120 outb_p(*maple_nvram_command, maple_nvram_base + *maple_nvram_offset);
123 printk(KERN_EMERG "Maple: Manual Restart Required\n");
126 static void maple_power_off(void)
128 unsigned int maple_nvram_base;
129 const unsigned int *maple_nvram_offset, *maple_nvram_command;
130 struct device_node *sp;
132 maple_nvram_base = maple_find_nvram_base();
133 if (maple_nvram_base == 0)
136 /* find service processor device */
137 sp = of_find_node_by_name(NULL, "service-processor");
139 printk(KERN_EMERG "Maple: Unable to find Service Processor\n");
142 maple_nvram_offset = get_property(sp, "power-off-addr", NULL);
143 maple_nvram_command = get_property(sp, "power-off-value", NULL);
147 outb_p(*maple_nvram_command, maple_nvram_base + *maple_nvram_offset);
150 printk(KERN_EMERG "Maple: Manual Power-Down Required\n");
153 static void maple_halt(void)
159 struct smp_ops_t maple_smp_ops = {
160 .probe = smp_mpic_probe,
161 .message_pass = smp_mpic_message_pass,
162 .kick_cpu = smp_generic_kick_cpu,
163 .setup_cpu = smp_mpic_setup_cpu,
164 .give_timebase = smp_generic_give_timebase,
165 .take_timebase = smp_generic_take_timebase,
167 #endif /* CONFIG_SMP */
169 void __init maple_setup_arch(void)
171 /* init to some ~sane value until calibrate_delay() runs */
172 loops_per_jiffy = 50000000;
174 /* Setup SMP callback */
176 smp_ops = &maple_smp_ops;
178 /* Lookup PCI hosts */
181 #ifdef CONFIG_DUMMY_CONSOLE
182 conswitchp = &dummy_con;
185 printk(KERN_DEBUG "Using native/NAP idle loop\n");
189 * Early initialization.
191 static void __init maple_init_early(void)
193 DBG(" -> maple_init_early\n");
195 iommu_init_early_dart();
197 DBG(" <- maple_init_early\n");
201 * This is almost identical to pSeries and CHRP. We need to make that
202 * code generic at one point, with appropriate bits in the device-tree to
203 * identify the presence of an HT APIC
205 static void __init maple_init_IRQ(void)
207 struct device_node *root, *np, *mpic_node = NULL;
208 const unsigned int *opprop;
209 unsigned long openpic_addr = 0;
210 int naddr, n, i, opplen, has_isus = 0;
212 unsigned int flags = MPIC_PRIMARY;
214 /* Locate MPIC in the device-tree. Note that there is a bug
215 * in Maple device-tree where the type of the controller is
216 * open-pic and not interrupt-controller
219 for_each_node_by_type(np, "interrupt-controller")
220 if (device_is_compatible(np, "open-pic")) {
224 if (mpic_node == NULL)
225 for_each_node_by_type(np, "open-pic") {
229 if (mpic_node == NULL) {
231 "Failed to locate the MPIC interrupt controller\n");
235 /* Find address list in /platform-open-pic */
236 root = of_find_node_by_path("/");
237 naddr = prom_n_addr_cells(root);
238 opprop = get_property(root, "platform-open-pic", &opplen);
240 openpic_addr = of_read_number(opprop, naddr);
241 has_isus = (opplen > naddr);
242 printk(KERN_DEBUG "OpenPIC addr: %lx, has ISUs: %d\n",
243 openpic_addr, has_isus);
247 BUG_ON(openpic_addr == 0);
249 /* Check for a big endian MPIC */
250 if (get_property(np, "big-endian", NULL) != NULL)
251 flags |= MPIC_BIG_ENDIAN;
253 /* XXX Maple specific bits */
254 flags |= MPIC_BROKEN_U3 | MPIC_WANTS_RESET;
255 /* All U3/U4 are big-endian, older SLOF firmware doesn't encode this */
256 flags |= MPIC_BIG_ENDIAN;
258 /* Setup the openpic driver. More device-tree junks, we hard code no
259 * ISUs for now. I'll have to revisit some stuffs with the folks doing
260 * the firmware for those
262 mpic = mpic_alloc(mpic_node, openpic_addr, flags,
263 /*has_isus ? 16 :*/ 0, 0, " MPIC ");
264 BUG_ON(mpic == NULL);
267 opplen /= sizeof(u32);
268 for (n = 0, i = naddr; i < opplen; i += naddr, n++) {
269 unsigned long isuaddr = of_read_number(opprop + i, naddr);
270 mpic_assign_isu(mpic, n, isuaddr);
273 /* All ISUs are setup, complete initialization */
275 ppc_md.get_irq = mpic_get_irq;
276 of_node_put(mpic_node);
280 static void __init maple_progress(char *s, unsigned short hex)
282 printk("*** %04x : %s\n", hex, s ? s : "");
287 * Called very early, MMU is off, device-tree isn't unflattened
289 static int __init maple_probe(void)
291 unsigned long root = of_get_flat_dt_root();
293 if (!of_flat_dt_is_compatible(root, "Momentum,Maple") &&
294 !of_flat_dt_is_compatible(root, "Momentum,Apache"))
297 * On U3, the DART (iommu) must be allocated now since it
298 * has an impact on htab_initialize (due to the large page it
299 * occupies having to be broken up so the DART itself is not
300 * part of the cacheable linar mapping
309 define_machine(maple_md) {
311 .probe = maple_probe,
312 .setup_arch = maple_setup_arch,
313 .init_early = maple_init_early,
314 .init_IRQ = maple_init_IRQ,
315 .pcibios_fixup = maple_pcibios_fixup,
316 .pci_get_legacy_ide_irq = maple_pci_get_legacy_ide_irq,
317 .restart = maple_restart,
318 .power_off = maple_power_off,
320 .get_boot_time = maple_get_boot_time,
321 .set_rtc_time = maple_set_rtc_time,
322 .get_rtc_time = maple_get_rtc_time,
323 .calibrate_decr = generic_calibrate_decr,
324 .progress = maple_progress,
325 .power_save = power4_idle,
327 .machine_kexec = default_machine_kexec,
328 .machine_kexec_prepare = default_machine_kexec_prepare,
329 .machine_crash_shutdown = default_machine_crash_shutdown,