1 /*
2  * Copyright (C) 2006-2007 PA Semi, Inc
3  *
4  * Authors: Kip Walker, PA Semi
5  *	    Olof Johansson, PA Semi
6  *
7  * Maintained by: Olof Johansson <olof@lixom.net>
8  *
9  * Based on arch/powerpc/platforms/maple/setup.c
10  *
11  * This program is free software; you can redistribute it and/or modify
12  * it under the terms of the GNU General Public License version 2 as
13  * published by the Free Software Foundation.
14  *
15  * This program is distributed in the hope that it will be useful,
16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
18  * GNU General Public License for more details.
19  *
20  * You should have received a copy of the GNU General Public License
21  * along with this program; if not, write to the Free Software
22  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
23  */
24 
25 #include <linux/errno.h>
26 #include <linux/kernel.h>
27 #include <linux/delay.h>
28 #include <linux/console.h>
29 #include <linux/export.h>
30 #include <linux/pci.h>
31 #include <linux/of_platform.h>
32 #include <linux/gfp.h>
33 
34 #include <asm/prom.h>
35 #include <asm/iommu.h>
36 #include <asm/machdep.h>
37 #include <asm/mpic.h>
38 #include <asm/smp.h>
39 #include <asm/time.h>
40 #include <asm/mmu.h>
41 #include <asm/debug.h>
42 
43 #include <pcmcia/ss.h>
44 #include <pcmcia/cistpl.h>
45 #include <pcmcia/ds.h>
46 
47 #include "pasemi.h"
48 
49 /* SDC reset register, must be pre-mapped at reset time */
50 static void __iomem *reset_reg;
51 
52 /* Various error status registers, must be pre-mapped at MCE time */
53 
54 #define MAX_MCE_REGS	32
55 struct mce_regs {
56 	char *name;
57 	void __iomem *addr;
58 };
59 
60 static struct mce_regs mce_regs[MAX_MCE_REGS];
61 static int num_mce_regs;
62 static int nmi_virq = 0;
63 
64 
65 static void __noreturn pas_restart(char *cmd)
66 {
67 	/* Need to put others cpu in hold loop so they're not sleeping */
68 	smp_send_stop();
69 	udelay(10000);
70 	printk("Restarting...\n");
71 	while (1)
72 		out_le32(reset_reg, 0x6000000);
73 }
74 
75 #ifdef CONFIG_SMP
76 static arch_spinlock_t timebase_lock;
77 static unsigned long timebase;
78 
79 static void pas_give_timebase(void)
80 {
81 	unsigned long flags;
82 
83 	local_irq_save(flags);
84 	hard_irq_disable();
85 	arch_spin_lock(&timebase_lock);
86 	mtspr(SPRN_TBCTL, TBCTL_FREEZE);
87 	isync();
88 	timebase = get_tb();
89 	arch_spin_unlock(&timebase_lock);
90 
91 	while (timebase)
92 		barrier();
93 	mtspr(SPRN_TBCTL, TBCTL_RESTART);
94 	local_irq_restore(flags);
95 }
96 
97 static void pas_take_timebase(void)
98 {
99 	while (!timebase)
100 		smp_rmb();
101 
102 	arch_spin_lock(&timebase_lock);
103 	set_tb(timebase >> 32, timebase & 0xffffffff);
104 	timebase = 0;
105 	arch_spin_unlock(&timebase_lock);
106 }
107 
108 static struct smp_ops_t pas_smp_ops = {
109 	.probe		= smp_mpic_probe,
110 	.message_pass	= smp_mpic_message_pass,
111 	.kick_cpu	= smp_generic_kick_cpu,
112 	.setup_cpu	= smp_mpic_setup_cpu,
113 	.give_timebase	= pas_give_timebase,
114 	.take_timebase	= pas_take_timebase,
115 };
116 #endif /* CONFIG_SMP */
117 
118 static void __init pas_setup_arch(void)
119 {
120 #ifdef CONFIG_SMP
121 	/* Setup SMP callback */
122 	smp_ops = &pas_smp_ops;
123 #endif
124 	/* Lookup PCI hosts */
125 	pas_pci_init();
126 
127 #ifdef CONFIG_DUMMY_CONSOLE
128 	conswitchp = &dummy_con;
129 #endif
130 
131 	/* Remap SDC register for doing reset */
132 	/* XXXOJN This should maybe come out of the device tree */
133 	reset_reg = ioremap(0xfc101100, 4);
134 }
135 
136 static int __init pas_setup_mce_regs(void)
137 {
138 	struct pci_dev *dev;
139 	int reg;
140 
141 	/* Remap various SoC status registers for use by the MCE handler */
142 
143 	reg = 0;
144 
145 	dev = pci_get_device(PCI_VENDOR_ID_PASEMI, 0xa00a, NULL);
146 	while (dev && reg < MAX_MCE_REGS) {
147 		mce_regs[reg].name = kasprintf(GFP_KERNEL,
148 						"mc%d_mcdebug_errsta", reg);
149 		mce_regs[reg].addr = pasemi_pci_getcfgaddr(dev, 0x730);
150 		dev = pci_get_device(PCI_VENDOR_ID_PASEMI, 0xa00a, dev);
151 		reg++;
152 	}
153 
154 	dev = pci_get_device(PCI_VENDOR_ID_PASEMI, 0xa001, NULL);
155 	if (dev && reg+4 < MAX_MCE_REGS) {
156 		mce_regs[reg].name = "iobdbg_IntStatus1";
157 		mce_regs[reg].addr = pasemi_pci_getcfgaddr(dev, 0x438);
158 		reg++;
159 		mce_regs[reg].name = "iobdbg_IOCTbusIntDbgReg";
160 		mce_regs[reg].addr = pasemi_pci_getcfgaddr(dev, 0x454);
161 		reg++;
162 		mce_regs[reg].name = "iobiom_IntStatus";
163 		mce_regs[reg].addr = pasemi_pci_getcfgaddr(dev, 0xc10);
164 		reg++;
165 		mce_regs[reg].name = "iobiom_IntDbgReg";
166 		mce_regs[reg].addr = pasemi_pci_getcfgaddr(dev, 0xc1c);
167 		reg++;
168 	}
169 
170 	dev = pci_get_device(PCI_VENDOR_ID_PASEMI, 0xa009, NULL);
171 	if (dev && reg+2 < MAX_MCE_REGS) {
172 		mce_regs[reg].name = "l2csts_IntStatus";
173 		mce_regs[reg].addr = pasemi_pci_getcfgaddr(dev, 0x200);
174 		reg++;
175 		mce_regs[reg].name = "l2csts_Cnt";
176 		mce_regs[reg].addr = pasemi_pci_getcfgaddr(dev, 0x214);
177 		reg++;
178 	}
179 
180 	num_mce_regs = reg;
181 
182 	return 0;
183 }
184 machine_device_initcall(pasemi, pas_setup_mce_regs);
185 
186 static __init void pas_init_IRQ(void)
187 {
188 	struct device_node *np;
189 	struct device_node *root, *mpic_node;
190 	unsigned long openpic_addr;
191 	const unsigned int *opprop;
192 	int naddr, opplen;
193 	int mpic_flags;
194 	const unsigned int *nmiprop;
195 	struct mpic *mpic;
196 
197 	mpic_node = NULL;
198 
199 	for_each_node_by_type(np, "interrupt-controller")
200 		if (of_device_is_compatible(np, "open-pic")) {
201 			mpic_node = np;
202 			break;
203 		}
204 	if (!mpic_node)
205 		for_each_node_by_type(np, "open-pic") {
206 			mpic_node = np;
207 			break;
208 		}
209 	if (!mpic_node) {
210 		printk(KERN_ERR
211 			"Failed to locate the MPIC interrupt controller\n");
212 		return;
213 	}
214 
215 	/* Find address list in /platform-open-pic */
216 	root = of_find_node_by_path("/");
217 	naddr = of_n_addr_cells(root);
218 	opprop = of_get_property(root, "platform-open-pic", &opplen);
219 	if (!opprop) {
220 		printk(KERN_ERR "No platform-open-pic property.\n");
221 		of_node_put(root);
222 		return;
223 	}
224 	openpic_addr = of_read_number(opprop, naddr);
225 	printk(KERN_DEBUG "OpenPIC addr: %lx\n", openpic_addr);
226 
227 	mpic_flags = MPIC_LARGE_VECTORS | MPIC_NO_BIAS | MPIC_NO_RESET;
228 
229 	nmiprop = of_get_property(mpic_node, "nmi-source", NULL);
230 	if (nmiprop)
231 		mpic_flags |= MPIC_ENABLE_MCK;
232 
233 	mpic = mpic_alloc(mpic_node, openpic_addr,
234 			  mpic_flags, 0, 0, "PASEMI-OPIC");
235 	BUG_ON(!mpic);
236 
237 	mpic_assign_isu(mpic, 0, mpic->paddr + 0x10000);
238 	mpic_init(mpic);
239 	/* The NMI/MCK source needs to be prio 15 */
240 	if (nmiprop) {
241 		nmi_virq = irq_create_mapping(NULL, *nmiprop);
242 		mpic_irq_set_priority(nmi_virq, 15);
243 		irq_set_irq_type(nmi_virq, IRQ_TYPE_EDGE_RISING);
244 		mpic_unmask_irq(irq_get_irq_data(nmi_virq));
245 	}
246 
247 	of_node_put(mpic_node);
248 	of_node_put(root);
249 }
250 
251 static void __init pas_progress(char *s, unsigned short hex)
252 {
253 	printk("[%04x] : %s\n", hex, s ? s : "");
254 }
255 
256 
257 static int pas_machine_check_handler(struct pt_regs *regs)
258 {
259 	int cpu = smp_processor_id();
260 	unsigned long srr0, srr1, dsisr;
261 	int dump_slb = 0;
262 	int i;
263 
264 	srr0 = regs->nip;
265 	srr1 = regs->msr;
266 
267 	if (nmi_virq && mpic_get_mcirq() == nmi_virq) {
268 		printk(KERN_ERR "NMI delivered\n");
269 		debugger(regs);
270 		mpic_end_irq(irq_get_irq_data(nmi_virq));
271 		goto out;
272 	}
273 
274 	dsisr = mfspr(SPRN_DSISR);
275 	printk(KERN_ERR "Machine Check on CPU %d\n", cpu);
276 	printk(KERN_ERR "SRR0  0x%016lx SRR1 0x%016lx\n", srr0, srr1);
277 	printk(KERN_ERR "DSISR 0x%016lx DAR  0x%016lx\n", dsisr, regs->dar);
278 	printk(KERN_ERR "BER   0x%016lx MER  0x%016lx\n", mfspr(SPRN_PA6T_BER),
279 		mfspr(SPRN_PA6T_MER));
280 	printk(KERN_ERR "IER   0x%016lx DER  0x%016lx\n", mfspr(SPRN_PA6T_IER),
281 		mfspr(SPRN_PA6T_DER));
282 	printk(KERN_ERR "Cause:\n");
283 
284 	if (srr1 & 0x200000)
285 		printk(KERN_ERR "Signalled by SDC\n");
286 
287 	if (srr1 & 0x100000) {
288 		printk(KERN_ERR "Load/Store detected error:\n");
289 		if (dsisr & 0x8000)
290 			printk(KERN_ERR "D-cache ECC double-bit error or bus error\n");
291 		if (dsisr & 0x4000)
292 			printk(KERN_ERR "LSU snoop response error\n");
293 		if (dsisr & 0x2000) {
294 			printk(KERN_ERR "MMU SLB multi-hit or invalid B field\n");
295 			dump_slb = 1;
296 		}
297 		if (dsisr & 0x1000)
298 			printk(KERN_ERR "Recoverable Duptags\n");
299 		if (dsisr & 0x800)
300 			printk(KERN_ERR "Recoverable D-cache parity error count overflow\n");
301 		if (dsisr & 0x400)
302 			printk(KERN_ERR "TLB parity error count overflow\n");
303 	}
304 
305 	if (srr1 & 0x80000)
306 		printk(KERN_ERR "Bus Error\n");
307 
308 	if (srr1 & 0x40000) {
309 		printk(KERN_ERR "I-side SLB multiple hit\n");
310 		dump_slb = 1;
311 	}
312 
313 	if (srr1 & 0x20000)
314 		printk(KERN_ERR "I-cache parity error hit\n");
315 
316 	if (num_mce_regs == 0)
317 		printk(KERN_ERR "No MCE registers mapped yet, can't dump\n");
318 	else
319 		printk(KERN_ERR "SoC debug registers:\n");
320 
321 	for (i = 0; i < num_mce_regs; i++)
322 		printk(KERN_ERR "%s: 0x%08x\n", mce_regs[i].name,
323 			in_le32(mce_regs[i].addr));
324 
325 	if (dump_slb) {
326 		unsigned long e, v;
327 		int i;
328 
329 		printk(KERN_ERR "slb contents:\n");
330 		for (i = 0; i < mmu_slb_size; i++) {
331 			asm volatile("slbmfee  %0,%1" : "=r" (e) : "r" (i));
332 			asm volatile("slbmfev  %0,%1" : "=r" (v) : "r" (i));
333 			printk(KERN_ERR "%02d %016lx %016lx\n", i, e, v);
334 		}
335 	}
336 
337 out:
338 	/* SRR1[62] is from MSR[62] if recoverable, so pass that back */
339 	return !!(srr1 & 0x2);
340 }
341 
342 #ifdef CONFIG_PCMCIA
343 static int pcmcia_notify(struct notifier_block *nb, unsigned long action,
344 			 void *data)
345 {
346 	struct device *dev = data;
347 	struct device *parent;
348 	struct pcmcia_device *pdev = to_pcmcia_dev(dev);
349 
350 	/* We are only intereted in device addition */
351 	if (action != BUS_NOTIFY_ADD_DEVICE)
352 		return 0;
353 
354 	parent = pdev->socket->dev.parent;
355 
356 	/* We know electra_cf devices will always have of_node set, since
357 	 * electra_cf is an of_platform driver.
358 	 */
359 	if (!parent->of_node)
360 		return 0;
361 
362 	if (!of_device_is_compatible(parent->of_node, "electra-cf"))
363 		return 0;
364 
365 	/* We use the direct ops for localbus */
366 	dev->dma_ops = &dma_direct_ops;
367 
368 	return 0;
369 }
370 
371 static struct notifier_block pcmcia_notifier = {
372 	.notifier_call = pcmcia_notify,
373 };
374 
375 static inline void pasemi_pcmcia_init(void)
376 {
377 	extern struct bus_type pcmcia_bus_type;
378 
379 	bus_register_notifier(&pcmcia_bus_type, &pcmcia_notifier);
380 }
381 
382 #else
383 
384 static inline void pasemi_pcmcia_init(void)
385 {
386 }
387 
388 #endif
389 
390 
391 static const struct of_device_id pasemi_bus_ids[] = {
392 	/* Unfortunately needed for legacy firmwares */
393 	{ .type = "localbus", },
394 	{ .type = "sdc", },
395 	/* These are the proper entries, which newer firmware uses */
396 	{ .compatible = "pasemi,localbus", },
397 	{ .compatible = "pasemi,sdc", },
398 	{},
399 };
400 
401 static int __init pasemi_publish_devices(void)
402 {
403 	pasemi_pcmcia_init();
404 
405 	/* Publish OF platform devices for SDC and other non-PCI devices */
406 	of_platform_bus_probe(NULL, pasemi_bus_ids, NULL);
407 
408 	return 0;
409 }
410 machine_device_initcall(pasemi, pasemi_publish_devices);
411 
412 
413 /*
414  * Called very early, MMU is off, device-tree isn't unflattened
415  */
416 static int __init pas_probe(void)
417 {
418 	if (!of_machine_is_compatible("PA6T-1682M") &&
419 	    !of_machine_is_compatible("pasemi,pwrficient"))
420 		return 0;
421 
422 	iommu_init_early_pasemi();
423 
424 	return 1;
425 }
426 
427 define_machine(pasemi) {
428 	.name			= "PA Semi PWRficient",
429 	.probe			= pas_probe,
430 	.setup_arch		= pas_setup_arch,
431 	.init_IRQ		= pas_init_IRQ,
432 	.get_irq		= mpic_get_irq,
433 	.restart		= pas_restart,
434 	.get_boot_time		= pas_get_boot_time,
435 	.calibrate_decr		= generic_calibrate_decr,
436 	.progress		= pas_progress,
437 	.machine_check_exception = pas_machine_check_handler,
438 };
439