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/export.h>
21 #include <linux/mm.h>
22 #include <linux/stddef.h>
23 #include <linux/unistd.h>
24 #include <linux/ptrace.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/memblock.h>
46 
47 #include <asm/processor.h>
48 #include <asm/sections.h>
49 #include <asm/prom.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 
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 
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 
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 
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 
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 
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  */
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  */
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 = 0;
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;
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 
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  */
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 
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  * all boards with U3H (CPC925) bridge.
342  */
343 static int __init maple_cpc925_edac_setup(void)
344 {
345 	struct platform_device *pdev;
346 	struct device_node *np = NULL;
347 	struct resource r;
348 	int ret;
349 	volatile void __iomem *mem;
350 	u32 rev;
351 
352 	np = of_find_node_by_type(NULL, "memory-controller");
353 	if (!np) {
354 		printk(KERN_ERR "%s: Unable to find memory-controller node\n",
355 			__func__);
356 		return -ENODEV;
357 	}
358 
359 	ret = of_address_to_resource(np, 0, &r);
360 	of_node_put(np);
361 
362 	if (ret < 0) {
363 		printk(KERN_ERR "%s: Unable to get memory-controller reg\n",
364 			__func__);
365 		return -ENODEV;
366 	}
367 
368 	mem = ioremap(r.start, resource_size(&r));
369 	if (!mem) {
370 		printk(KERN_ERR "%s: Unable to map memory-controller memory\n",
371 				__func__);
372 		return -ENOMEM;
373 	}
374 
375 	rev = __raw_readl(mem);
376 	iounmap(mem);
377 
378 	if (rev < 0x34 || rev > 0x3f) { /* U3H */
379 		printk(KERN_ERR "%s: Non-CPC925(U3H) bridge revision: %02x\n",
380 			__func__, rev);
381 		return 0;
382 	}
383 
384 	pdev = platform_device_register_simple("cpc925_edac", 0, &r, 1);
385 	if (IS_ERR(pdev))
386 		return PTR_ERR(pdev);
387 
388 	printk(KERN_INFO "%s: CPC925 platform device created\n", __func__);
389 
390 	return 0;
391 }
392 machine_device_initcall(maple, maple_cpc925_edac_setup);
393 #endif
394