1 /*
2 * Maple (970 eval board) setup code
3 *
4 * (c) Copyright 2004 Benjamin Herrenschmidt (benh@kernel.crashing.org),
5 * IBM Corp.
6 *
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.
11 *
12 */
13
14 #undef DEBUG
15
16 #include <linux/init.h>
17 #include <linux/errno.h>
18 #include <linux/sched.h>
19 #include <linux/kernel.h>
20 #include <linux/mm.h>
21 #include <linux/stddef.h>
22 #include <linux/unistd.h>
23 #include <linux/ptrace.h>
24 #include <linux/user.h>
25 #include <linux/tty.h>
26 #include <linux/string.h>
27 #include <linux/delay.h>
28 #include <linux/ioport.h>
29 #include <linux/major.h>
30 #include <linux/initrd.h>
31 #include <linux/vt_kern.h>
32 #include <linux/console.h>
33 #include <linux/pci.h>
34 #include <linux/adb.h>
35 #include <linux/cuda.h>
36 #include <linux/pmu.h>
37 #include <linux/irq.h>
38 #include <linux/seq_file.h>
39 #include <linux/root_dev.h>
40 #include <linux/serial.h>
41 #include <linux/smp.h>
42 #include <linux/bitops.h>
43 #include <linux/of_device.h>
44 #include <linux/memblock.h>
45
46 #include <asm/processor.h>
47 #include <asm/sections.h>
48 #include <asm/prom.h>
49 #include <asm/system.h>
50 #include <asm/pgtable.h>
51 #include <asm/io.h>
52 #include <asm/pci-bridge.h>
53 #include <asm/iommu.h>
54 #include <asm/machdep.h>
55 #include <asm/dma.h>
56 #include <asm/cputable.h>
57 #include <asm/time.h>
58 #include <asm/mpic.h>
59 #include <asm/rtas.h>
60 #include <asm/udbg.h>
61 #include <asm/nvram.h>
62
63 #include "maple.h"
64
65 #ifdef DEBUG
66 #define DBG(fmt...) udbg_printf(fmt)
67 #else
68 #define DBG(fmt...)
69 #endif
70
maple_find_nvram_base(void)71 static unsigned long maple_find_nvram_base(void)
72 {
73 struct device_node *rtcs;
74 unsigned long result = 0;
75
76 /* find NVRAM device */
77 rtcs = of_find_compatible_node(NULL, "nvram", "AMD8111");
78 if (rtcs) {
79 struct resource r;
80 if (of_address_to_resource(rtcs, 0, &r)) {
81 printk(KERN_EMERG "Maple: Unable to translate NVRAM"
82 " address\n");
83 goto bail;
84 }
85 if (!(r.flags & IORESOURCE_IO)) {
86 printk(KERN_EMERG "Maple: NVRAM address isn't PIO!\n");
87 goto bail;
88 }
89 result = r.start;
90 } else
91 printk(KERN_EMERG "Maple: Unable to find NVRAM\n");
92 bail:
93 of_node_put(rtcs);
94 return result;
95 }
96
maple_restart(char * cmd)97 static void maple_restart(char *cmd)
98 {
99 unsigned int maple_nvram_base;
100 const unsigned int *maple_nvram_offset, *maple_nvram_command;
101 struct device_node *sp;
102
103 maple_nvram_base = maple_find_nvram_base();
104 if (maple_nvram_base == 0)
105 goto fail;
106
107 /* find service processor device */
108 sp = of_find_node_by_name(NULL, "service-processor");
109 if (!sp) {
110 printk(KERN_EMERG "Maple: Unable to find Service Processor\n");
111 goto fail;
112 }
113 maple_nvram_offset = of_get_property(sp, "restart-addr", NULL);
114 maple_nvram_command = of_get_property(sp, "restart-value", NULL);
115 of_node_put(sp);
116
117 /* send command */
118 outb_p(*maple_nvram_command, maple_nvram_base + *maple_nvram_offset);
119 for (;;) ;
120 fail:
121 printk(KERN_EMERG "Maple: Manual Restart Required\n");
122 }
123
maple_power_off(void)124 static void maple_power_off(void)
125 {
126 unsigned int maple_nvram_base;
127 const unsigned int *maple_nvram_offset, *maple_nvram_command;
128 struct device_node *sp;
129
130 maple_nvram_base = maple_find_nvram_base();
131 if (maple_nvram_base == 0)
132 goto fail;
133
134 /* find service processor device */
135 sp = of_find_node_by_name(NULL, "service-processor");
136 if (!sp) {
137 printk(KERN_EMERG "Maple: Unable to find Service Processor\n");
138 goto fail;
139 }
140 maple_nvram_offset = of_get_property(sp, "power-off-addr", NULL);
141 maple_nvram_command = of_get_property(sp, "power-off-value", NULL);
142 of_node_put(sp);
143
144 /* send command */
145 outb_p(*maple_nvram_command, maple_nvram_base + *maple_nvram_offset);
146 for (;;) ;
147 fail:
148 printk(KERN_EMERG "Maple: Manual Power-Down Required\n");
149 }
150
maple_halt(void)151 static void maple_halt(void)
152 {
153 maple_power_off();
154 }
155
156 #ifdef CONFIG_SMP
157 struct smp_ops_t maple_smp_ops = {
158 .probe = smp_mpic_probe,
159 .message_pass = smp_mpic_message_pass,
160 .kick_cpu = smp_generic_kick_cpu,
161 .setup_cpu = smp_mpic_setup_cpu,
162 .give_timebase = smp_generic_give_timebase,
163 .take_timebase = smp_generic_take_timebase,
164 };
165 #endif /* CONFIG_SMP */
166
maple_use_rtas_reboot_and_halt_if_present(void)167 static void __init maple_use_rtas_reboot_and_halt_if_present(void)
168 {
169 if (rtas_service_present("system-reboot") &&
170 rtas_service_present("power-off")) {
171 ppc_md.restart = rtas_restart;
172 ppc_md.power_off = rtas_power_off;
173 ppc_md.halt = rtas_halt;
174 }
175 }
176
maple_setup_arch(void)177 void __init maple_setup_arch(void)
178 {
179 /* init to some ~sane value until calibrate_delay() runs */
180 loops_per_jiffy = 50000000;
181
182 /* Setup SMP callback */
183 #ifdef CONFIG_SMP
184 smp_ops = &maple_smp_ops;
185 #endif
186 /* Lookup PCI hosts */
187 maple_pci_init();
188
189 #ifdef CONFIG_DUMMY_CONSOLE
190 conswitchp = &dummy_con;
191 #endif
192 maple_use_rtas_reboot_and_halt_if_present();
193
194 printk(KERN_DEBUG "Using native/NAP idle loop\n");
195
196 mmio_nvram_init();
197 }
198
199 /*
200 * Early initialization.
201 */
maple_init_early(void)202 static void __init maple_init_early(void)
203 {
204 DBG(" -> maple_init_early\n");
205
206 iommu_init_early_dart();
207
208 DBG(" <- maple_init_early\n");
209 }
210
211 /*
212 * This is almost identical to pSeries and CHRP. We need to make that
213 * code generic at one point, with appropriate bits in the device-tree to
214 * identify the presence of an HT APIC
215 */
maple_init_IRQ(void)216 static void __init maple_init_IRQ(void)
217 {
218 struct device_node *root, *np, *mpic_node = NULL;
219 const unsigned int *opprop;
220 unsigned long openpic_addr = 0;
221 int naddr, n, i, opplen, has_isus = 0;
222 struct mpic *mpic;
223 unsigned int flags = MPIC_PRIMARY;
224
225 /* Locate MPIC in the device-tree. Note that there is a bug
226 * in Maple device-tree where the type of the controller is
227 * open-pic and not interrupt-controller
228 */
229
230 for_each_node_by_type(np, "interrupt-controller")
231 if (of_device_is_compatible(np, "open-pic")) {
232 mpic_node = np;
233 break;
234 }
235 if (mpic_node == NULL)
236 for_each_node_by_type(np, "open-pic") {
237 mpic_node = np;
238 break;
239 }
240 if (mpic_node == NULL) {
241 printk(KERN_ERR
242 "Failed to locate the MPIC interrupt controller\n");
243 return;
244 }
245
246 /* Find address list in /platform-open-pic */
247 root = of_find_node_by_path("/");
248 naddr = of_n_addr_cells(root);
249 opprop = of_get_property(root, "platform-open-pic", &opplen);
250 if (opprop != 0) {
251 openpic_addr = of_read_number(opprop, naddr);
252 has_isus = (opplen > naddr);
253 printk(KERN_DEBUG "OpenPIC addr: %lx, has ISUs: %d\n",
254 openpic_addr, has_isus);
255 }
256
257 BUG_ON(openpic_addr == 0);
258
259 /* Check for a big endian MPIC */
260 if (of_get_property(np, "big-endian", NULL) != NULL)
261 flags |= MPIC_BIG_ENDIAN;
262
263 /* XXX Maple specific bits */
264 flags |= MPIC_U3_HT_IRQS | MPIC_WANTS_RESET;
265 /* All U3/U4 are big-endian, older SLOF firmware doesn't encode this */
266 flags |= MPIC_BIG_ENDIAN;
267
268 /* Setup the openpic driver. More device-tree junks, we hard code no
269 * ISUs for now. I'll have to revisit some stuffs with the folks doing
270 * the firmware for those
271 */
272 mpic = mpic_alloc(mpic_node, openpic_addr, flags,
273 /*has_isus ? 16 :*/ 0, 0, " MPIC ");
274 BUG_ON(mpic == NULL);
275
276 /* Add ISUs */
277 opplen /= sizeof(u32);
278 for (n = 0, i = naddr; i < opplen; i += naddr, n++) {
279 unsigned long isuaddr = of_read_number(opprop + i, naddr);
280 mpic_assign_isu(mpic, n, isuaddr);
281 }
282
283 /* All ISUs are setup, complete initialization */
284 mpic_init(mpic);
285 ppc_md.get_irq = mpic_get_irq;
286 of_node_put(mpic_node);
287 of_node_put(root);
288 }
289
maple_progress(char * s,unsigned short hex)290 static void __init maple_progress(char *s, unsigned short hex)
291 {
292 printk("*** %04x : %s\n", hex, s ? s : "");
293 }
294
295
296 /*
297 * Called very early, MMU is off, device-tree isn't unflattened
298 */
maple_probe(void)299 static int __init maple_probe(void)
300 {
301 unsigned long root = of_get_flat_dt_root();
302
303 if (!of_flat_dt_is_compatible(root, "Momentum,Maple") &&
304 !of_flat_dt_is_compatible(root, "Momentum,Apache"))
305 return 0;
306 /*
307 * On U3, the DART (iommu) must be allocated now since it
308 * has an impact on htab_initialize (due to the large page it
309 * occupies having to be broken up so the DART itself is not
310 * part of the cacheable linar mapping
311 */
312 alloc_dart_table();
313
314 hpte_init_native();
315
316 return 1;
317 }
318
define_machine(maple)319 define_machine(maple) {
320 .name = "Maple",
321 .probe = maple_probe,
322 .setup_arch = maple_setup_arch,
323 .init_early = maple_init_early,
324 .init_IRQ = maple_init_IRQ,
325 .pci_irq_fixup = maple_pci_irq_fixup,
326 .pci_get_legacy_ide_irq = maple_pci_get_legacy_ide_irq,
327 .restart = maple_restart,
328 .power_off = maple_power_off,
329 .halt = maple_halt,
330 .get_boot_time = maple_get_boot_time,
331 .set_rtc_time = maple_set_rtc_time,
332 .get_rtc_time = maple_get_rtc_time,
333 .calibrate_decr = generic_calibrate_decr,
334 .progress = maple_progress,
335 .power_save = power4_idle,
336 };
337
338 #ifdef CONFIG_EDAC
339 /*
340 * Register a platform device for CPC925 memory controller on
341 * Motorola ATCA-6101 blade.
342 */
343 #define MAPLE_CPC925_MODEL "Motorola,ATCA-6101"
maple_cpc925_edac_setup(void)344 static int __init maple_cpc925_edac_setup(void)
345 {
346 struct platform_device *pdev;
347 struct device_node *np = NULL;
348 struct resource r;
349 const unsigned char *model;
350 int ret;
351
352 np = of_find_node_by_path("/");
353 if (!np) {
354 printk(KERN_ERR "%s: Unable to get root node\n", __func__);
355 return -ENODEV;
356 }
357
358 model = (const unsigned char *)of_get_property(np, "model", NULL);
359 if (!model) {
360 printk(KERN_ERR "%s: Unabel to get model info\n", __func__);
361 of_node_put(np);
362 return -ENODEV;
363 }
364
365 ret = strcmp(model, MAPLE_CPC925_MODEL);
366 of_node_put(np);
367
368 if (ret != 0)
369 return 0;
370
371 np = of_find_node_by_type(NULL, "memory-controller");
372 if (!np) {
373 printk(KERN_ERR "%s: Unable to find memory-controller node\n",
374 __func__);
375 return -ENODEV;
376 }
377
378 ret = of_address_to_resource(np, 0, &r);
379 of_node_put(np);
380
381 if (ret < 0) {
382 printk(KERN_ERR "%s: Unable to get memory-controller reg\n",
383 __func__);
384 return -ENODEV;
385 }
386
387 pdev = platform_device_register_simple("cpc925_edac", 0, &r, 1);
388 if (IS_ERR(pdev))
389 return PTR_ERR(pdev);
390
391 printk(KERN_INFO "%s: CPC925 platform device created\n", __func__);
392
393 return 0;
394 }
395 machine_device_initcall(maple, maple_cpc925_edac_setup);
396 #endif
397