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/tty.h>
27 #include <linux/string.h>
28 #include <linux/delay.h>
29 #include <linux/ioport.h>
30 #include <linux/major.h>
31 #include <linux/initrd.h>
32 #include <linux/vt_kern.h>
33 #include <linux/console.h>
34 #include <linux/pci.h>
35 #include <linux/adb.h>
36 #include <linux/cuda.h>
37 #include <linux/pmu.h>
38 #include <linux/irq.h>
39 #include <linux/seq_file.h>
40 #include <linux/root_dev.h>
41 #include <linux/serial.h>
42 #include <linux/smp.h>
43 #include <linux/bitops.h>
44 #include <linux/of_device.h>
45 #include <linux/lmb.h>
47 #include <asm/processor.h>
48 #include <asm/sections.h>
50 #include <asm/system.h>
51 #include <asm/pgtable.h>
53 #include <asm/pci-bridge.h>
54 #include <asm/iommu.h>
55 #include <asm/machdep.h>
57 #include <asm/cputable.h>
62 #include <asm/nvram.h>
67 #define DBG(fmt...) udbg_printf(fmt)
72 static unsigned long maple_find_nvram_base(void)
74 struct device_node *rtcs;
75 unsigned long result = 0;
77 /* find NVRAM device */
78 rtcs = of_find_compatible_node(NULL, "nvram", "AMD8111");
81 if (of_address_to_resource(rtcs, 0, &r)) {
82 printk(KERN_EMERG "Maple: Unable to translate NVRAM"
86 if (!(r.flags & IORESOURCE_IO)) {
87 printk(KERN_EMERG "Maple: NVRAM address isn't PIO!\n");
92 printk(KERN_EMERG "Maple: Unable to find NVRAM\n");
98 static void maple_restart(char *cmd)
100 unsigned int maple_nvram_base;
101 const unsigned int *maple_nvram_offset, *maple_nvram_command;
102 struct device_node *sp;
104 maple_nvram_base = maple_find_nvram_base();
105 if (maple_nvram_base == 0)
108 /* find service processor device */
109 sp = of_find_node_by_name(NULL, "service-processor");
111 printk(KERN_EMERG "Maple: Unable to find Service Processor\n");
114 maple_nvram_offset = of_get_property(sp, "restart-addr", NULL);
115 maple_nvram_command = of_get_property(sp, "restart-value", NULL);
119 outb_p(*maple_nvram_command, maple_nvram_base + *maple_nvram_offset);
122 printk(KERN_EMERG "Maple: Manual Restart Required\n");
125 static void maple_power_off(void)
127 unsigned int maple_nvram_base;
128 const unsigned int *maple_nvram_offset, *maple_nvram_command;
129 struct device_node *sp;
131 maple_nvram_base = maple_find_nvram_base();
132 if (maple_nvram_base == 0)
135 /* find service processor device */
136 sp = of_find_node_by_name(NULL, "service-processor");
138 printk(KERN_EMERG "Maple: Unable to find Service Processor\n");
141 maple_nvram_offset = of_get_property(sp, "power-off-addr", NULL);
142 maple_nvram_command = of_get_property(sp, "power-off-value", NULL);
146 outb_p(*maple_nvram_command, maple_nvram_base + *maple_nvram_offset);
149 printk(KERN_EMERG "Maple: Manual Power-Down Required\n");
152 static void maple_halt(void)
158 struct smp_ops_t maple_smp_ops = {
159 .probe = smp_mpic_probe,
160 .message_pass = smp_mpic_message_pass,
161 .kick_cpu = smp_generic_kick_cpu,
162 .setup_cpu = smp_mpic_setup_cpu,
163 .give_timebase = smp_generic_give_timebase,
164 .take_timebase = smp_generic_take_timebase,
166 #endif /* CONFIG_SMP */
168 static void __init maple_use_rtas_reboot_and_halt_if_present(void)
170 if (rtas_service_present("system-reboot") &&
171 rtas_service_present("power-off")) {
172 ppc_md.restart = rtas_restart;
173 ppc_md.power_off = rtas_power_off;
174 ppc_md.halt = rtas_halt;
178 void __init maple_setup_arch(void)
180 /* init to some ~sane value until calibrate_delay() runs */
181 loops_per_jiffy = 50000000;
183 /* Setup SMP callback */
185 smp_ops = &maple_smp_ops;
187 /* Lookup PCI hosts */
190 #ifdef CONFIG_DUMMY_CONSOLE
191 conswitchp = &dummy_con;
193 maple_use_rtas_reboot_and_halt_if_present();
195 printk(KERN_DEBUG "Using native/NAP idle loop\n");
201 * Early initialization.
203 static void __init maple_init_early(void)
205 DBG(" -> maple_init_early\n");
207 iommu_init_early_dart();
209 DBG(" <- maple_init_early\n");
213 * This is almost identical to pSeries and CHRP. We need to make that
214 * code generic at one point, with appropriate bits in the device-tree to
215 * identify the presence of an HT APIC
217 static void __init maple_init_IRQ(void)
219 struct device_node *root, *np, *mpic_node = NULL;
220 const unsigned int *opprop;
221 unsigned long openpic_addr = 0;
222 int naddr, n, i, opplen, has_isus = 0;
224 unsigned int flags = MPIC_PRIMARY;
226 /* Locate MPIC in the device-tree. Note that there is a bug
227 * in Maple device-tree where the type of the controller is
228 * open-pic and not interrupt-controller
231 for_each_node_by_type(np, "interrupt-controller")
232 if (of_device_is_compatible(np, "open-pic")) {
236 if (mpic_node == NULL)
237 for_each_node_by_type(np, "open-pic") {
241 if (mpic_node == NULL) {
243 "Failed to locate the MPIC interrupt controller\n");
247 /* Find address list in /platform-open-pic */
248 root = of_find_node_by_path("/");
249 naddr = of_n_addr_cells(root);
250 opprop = of_get_property(root, "platform-open-pic", &opplen);
252 openpic_addr = of_read_number(opprop, naddr);
253 has_isus = (opplen > naddr);
254 printk(KERN_DEBUG "OpenPIC addr: %lx, has ISUs: %d\n",
255 openpic_addr, has_isus);
258 BUG_ON(openpic_addr == 0);
260 /* Check for a big endian MPIC */
261 if (of_get_property(np, "big-endian", NULL) != NULL)
262 flags |= MPIC_BIG_ENDIAN;
264 /* XXX Maple specific bits */
265 flags |= MPIC_U3_HT_IRQS | MPIC_WANTS_RESET;
266 /* All U3/U4 are big-endian, older SLOF firmware doesn't encode this */
267 flags |= MPIC_BIG_ENDIAN;
269 /* Setup the openpic driver. More device-tree junks, we hard code no
270 * ISUs for now. I'll have to revisit some stuffs with the folks doing
271 * the firmware for those
273 mpic = mpic_alloc(mpic_node, openpic_addr, flags,
274 /*has_isus ? 16 :*/ 0, 0, " MPIC ");
275 BUG_ON(mpic == NULL);
278 opplen /= sizeof(u32);
279 for (n = 0, i = naddr; i < opplen; i += naddr, n++) {
280 unsigned long isuaddr = of_read_number(opprop + i, naddr);
281 mpic_assign_isu(mpic, n, isuaddr);
284 /* All ISUs are setup, complete initialization */
286 ppc_md.get_irq = mpic_get_irq;
287 of_node_put(mpic_node);
291 static void __init maple_progress(char *s, unsigned short hex)
293 printk("*** %04x : %s\n", hex, s ? s : "");
298 * Called very early, MMU is off, device-tree isn't unflattened
300 static int __init maple_probe(void)
302 unsigned long root = of_get_flat_dt_root();
304 if (!of_flat_dt_is_compatible(root, "Momentum,Maple") &&
305 !of_flat_dt_is_compatible(root, "Momentum,Apache"))
308 * On U3, the DART (iommu) must be allocated now since it
309 * has an impact on htab_initialize (due to the large page it
310 * occupies having to be broken up so the DART itself is not
311 * part of the cacheable linar mapping
320 define_machine(maple) {
322 .probe = maple_probe,
323 .setup_arch = maple_setup_arch,
324 .init_early = maple_init_early,
325 .init_IRQ = maple_init_IRQ,
326 .pci_irq_fixup = maple_pci_irq_fixup,
327 .pci_get_legacy_ide_irq = maple_pci_get_legacy_ide_irq,
328 .restart = maple_restart,
329 .power_off = maple_power_off,
331 .get_boot_time = maple_get_boot_time,
332 .set_rtc_time = maple_set_rtc_time,
333 .get_rtc_time = maple_get_rtc_time,
334 .calibrate_decr = generic_calibrate_decr,
335 .progress = maple_progress,
336 .power_save = power4_idle,