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
71static 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
97static 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
124static 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
151static void maple_halt(void)
152{
153	maple_power_off();
154}
155
156#ifdef CONFIG_SMP
157struct 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
167static 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		pm_power_off = rtas_power_off;
173		ppc_md.halt = rtas_halt;
174	}
175}
176
177void __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 */
202static void __init maple_init_early(void)
203{
204	DBG(" -> maple_init_early\n");
205
206	iommu_init_early_dart(&maple_pci_controller_ops);
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 */
216static 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
290static 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 */
299static 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	pm_power_off = maple_power_off;
316
317	return 1;
318}
319
320define_machine(maple) {
321	.name			= "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	.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 */
343static 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}
392machine_device_initcall(maple, maple_cpc925_edac_setup);
393#endif
394