1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (C) 2006-2007 PA Semi, Inc
4 *
5 * Authors: Kip Walker, PA Semi
6 * Olof Johansson, PA Semi
7 *
8 * Maintained by: Olof Johansson <olof@lixom.net>
9 *
10 * Based on arch/powerpc/platforms/maple/setup.c
11 */
12
13 #include <linux/errno.h>
14 #include <linux/kernel.h>
15 #include <linux/delay.h>
16 #include <linux/console.h>
17 #include <linux/export.h>
18 #include <linux/pci.h>
19 #include <linux/of.h>
20 #include <linux/of_platform.h>
21 #include <linux/platform_device.h>
22 #include <linux/gfp.h>
23 #include <linux/irqdomain.h>
24
25 #include <asm/iommu.h>
26 #include <asm/machdep.h>
27 #include <asm/i8259.h>
28 #include <asm/mpic.h>
29 #include <asm/smp.h>
30 #include <asm/time.h>
31 #include <asm/mmu.h>
32 #include <asm/debug.h>
33
34 #include <pcmcia/ss.h>
35 #include <pcmcia/cistpl.h>
36 #include <pcmcia/ds.h>
37
38 #include "pasemi.h"
39
40 /* SDC reset register, must be pre-mapped at reset time */
41 static void __iomem *reset_reg;
42
43 /* Various error status registers, must be pre-mapped at MCE time */
44
45 #define MAX_MCE_REGS 32
46 struct mce_regs {
47 char *name;
48 void __iomem *addr;
49 };
50
51 static struct mce_regs mce_regs[MAX_MCE_REGS];
52 static int num_mce_regs;
53 static int nmi_virq = 0;
54
55
pas_restart(char * cmd)56 static void __noreturn pas_restart(char *cmd)
57 {
58 /* Need to put others cpu in hold loop so they're not sleeping */
59 smp_send_stop();
60 udelay(10000);
61 printk("Restarting...\n");
62 while (1)
63 out_le32(reset_reg, 0x6000000);
64 }
65
66 #ifdef CONFIG_PPC_PASEMI_NEMO
pas_shutdown(void)67 static void pas_shutdown(void)
68 {
69 /* Set the PLD bit that makes the SB600 think the power button is being pressed */
70 void __iomem *pld_map = ioremap(0xf5000000,4096);
71 while (1)
72 out_8(pld_map+7,0x01);
73 }
74
75 /* RTC platform device structure as is not in device tree */
76 static struct resource rtc_resource[] = {{
77 .name = "rtc",
78 .start = 0x70,
79 .end = 0x71,
80 .flags = IORESOURCE_IO,
81 }, {
82 .name = "rtc",
83 .start = 8,
84 .end = 8,
85 .flags = IORESOURCE_IRQ,
86 }};
87
nemo_init_rtc(void)88 static inline void nemo_init_rtc(void)
89 {
90 platform_device_register_simple("rtc_cmos", -1, rtc_resource, 2);
91 }
92
93 #else
94
nemo_init_rtc(void)95 static inline void nemo_init_rtc(void)
96 {
97 }
98 #endif
99
100 #ifdef CONFIG_SMP
101 static arch_spinlock_t timebase_lock;
102 static unsigned long timebase;
103
pas_give_timebase(void)104 static void pas_give_timebase(void)
105 {
106 unsigned long flags;
107
108 local_irq_save(flags);
109 hard_irq_disable();
110 arch_spin_lock(&timebase_lock);
111 mtspr(SPRN_TBCTL, TBCTL_FREEZE);
112 isync();
113 timebase = get_tb();
114 arch_spin_unlock(&timebase_lock);
115
116 while (timebase)
117 barrier();
118 mtspr(SPRN_TBCTL, TBCTL_RESTART);
119 local_irq_restore(flags);
120 }
121
pas_take_timebase(void)122 static void pas_take_timebase(void)
123 {
124 while (!timebase)
125 smp_rmb();
126
127 arch_spin_lock(&timebase_lock);
128 set_tb(timebase >> 32, timebase & 0xffffffff);
129 timebase = 0;
130 arch_spin_unlock(&timebase_lock);
131 }
132
133 static struct smp_ops_t pas_smp_ops = {
134 .probe = smp_mpic_probe,
135 .message_pass = smp_mpic_message_pass,
136 .kick_cpu = smp_generic_kick_cpu,
137 .setup_cpu = smp_mpic_setup_cpu,
138 .give_timebase = pas_give_timebase,
139 .take_timebase = pas_take_timebase,
140 };
141 #endif /* CONFIG_SMP */
142
pas_setup_arch(void)143 static void __init pas_setup_arch(void)
144 {
145 #ifdef CONFIG_SMP
146 /* Setup SMP callback */
147 smp_ops = &pas_smp_ops;
148 #endif
149
150 /* Remap SDC register for doing reset */
151 /* XXXOJN This should maybe come out of the device tree */
152 reset_reg = ioremap(0xfc101100, 4);
153 }
154
pas_setup_mce_regs(void)155 static int __init pas_setup_mce_regs(void)
156 {
157 struct pci_dev *dev;
158 int reg;
159
160 /* Remap various SoC status registers for use by the MCE handler */
161
162 reg = 0;
163
164 dev = pci_get_device(PCI_VENDOR_ID_PASEMI, 0xa00a, NULL);
165 while (dev && reg < MAX_MCE_REGS) {
166 mce_regs[reg].name = kasprintf(GFP_KERNEL,
167 "mc%d_mcdebug_errsta", reg);
168 mce_regs[reg].addr = pasemi_pci_getcfgaddr(dev, 0x730);
169 dev = pci_get_device(PCI_VENDOR_ID_PASEMI, 0xa00a, dev);
170 reg++;
171 }
172
173 dev = pci_get_device(PCI_VENDOR_ID_PASEMI, 0xa001, NULL);
174 if (dev && reg+4 < MAX_MCE_REGS) {
175 mce_regs[reg].name = "iobdbg_IntStatus1";
176 mce_regs[reg].addr = pasemi_pci_getcfgaddr(dev, 0x438);
177 reg++;
178 mce_regs[reg].name = "iobdbg_IOCTbusIntDbgReg";
179 mce_regs[reg].addr = pasemi_pci_getcfgaddr(dev, 0x454);
180 reg++;
181 mce_regs[reg].name = "iobiom_IntStatus";
182 mce_regs[reg].addr = pasemi_pci_getcfgaddr(dev, 0xc10);
183 reg++;
184 mce_regs[reg].name = "iobiom_IntDbgReg";
185 mce_regs[reg].addr = pasemi_pci_getcfgaddr(dev, 0xc1c);
186 reg++;
187 }
188
189 dev = pci_get_device(PCI_VENDOR_ID_PASEMI, 0xa009, NULL);
190 if (dev && reg+2 < MAX_MCE_REGS) {
191 mce_regs[reg].name = "l2csts_IntStatus";
192 mce_regs[reg].addr = pasemi_pci_getcfgaddr(dev, 0x200);
193 reg++;
194 mce_regs[reg].name = "l2csts_Cnt";
195 mce_regs[reg].addr = pasemi_pci_getcfgaddr(dev, 0x214);
196 reg++;
197 }
198
199 num_mce_regs = reg;
200
201 return 0;
202 }
203 machine_device_initcall(pasemi, pas_setup_mce_regs);
204
205 #ifdef CONFIG_PPC_PASEMI_NEMO
sb600_8259_cascade(struct irq_desc * desc)206 static void sb600_8259_cascade(struct irq_desc *desc)
207 {
208 struct irq_chip *chip = irq_desc_get_chip(desc);
209 unsigned int cascade_irq = i8259_irq();
210
211 if (cascade_irq)
212 generic_handle_irq(cascade_irq);
213
214 chip->irq_eoi(&desc->irq_data);
215 }
216
nemo_init_IRQ(struct mpic * mpic)217 static void __init nemo_init_IRQ(struct mpic *mpic)
218 {
219 struct device_node *np;
220 int gpio_virq;
221 /* Connect the SB600's legacy i8259 controller */
222 np = of_find_node_by_path("/pxp@0,e0000000");
223 i8259_init(np, 0);
224 of_node_put(np);
225
226 gpio_virq = irq_create_mapping(NULL, 3);
227 irq_set_irq_type(gpio_virq, IRQ_TYPE_LEVEL_HIGH);
228 irq_set_chained_handler(gpio_virq, sb600_8259_cascade);
229 mpic_unmask_irq(irq_get_irq_data(gpio_virq));
230
231 irq_set_default_host(mpic->irqhost);
232 }
233
234 #else
235
nemo_init_IRQ(struct mpic * mpic)236 static inline void nemo_init_IRQ(struct mpic *mpic)
237 {
238 }
239 #endif
240
pas_init_IRQ(void)241 static __init void pas_init_IRQ(void)
242 {
243 struct device_node *np;
244 struct device_node *root, *mpic_node;
245 unsigned long openpic_addr;
246 const unsigned int *opprop;
247 int naddr, opplen;
248 int mpic_flags;
249 const unsigned int *nmiprop;
250 struct mpic *mpic;
251
252 mpic_node = NULL;
253
254 for_each_node_by_type(np, "interrupt-controller")
255 if (of_device_is_compatible(np, "open-pic")) {
256 mpic_node = np;
257 break;
258 }
259 if (!mpic_node)
260 for_each_node_by_type(np, "open-pic") {
261 mpic_node = np;
262 break;
263 }
264 if (!mpic_node) {
265 pr_err("Failed to locate the MPIC interrupt controller\n");
266 return;
267 }
268
269 /* Find address list in /platform-open-pic */
270 root = of_find_node_by_path("/");
271 naddr = of_n_addr_cells(root);
272 opprop = of_get_property(root, "platform-open-pic", &opplen);
273 if (!opprop) {
274 pr_err("No platform-open-pic property.\n");
275 of_node_put(root);
276 return;
277 }
278 openpic_addr = of_read_number(opprop, naddr);
279 pr_debug("OpenPIC addr: %lx\n", openpic_addr);
280
281 mpic_flags = MPIC_LARGE_VECTORS | MPIC_NO_BIAS | MPIC_NO_RESET;
282
283 nmiprop = of_get_property(mpic_node, "nmi-source", NULL);
284 if (nmiprop)
285 mpic_flags |= MPIC_ENABLE_MCK;
286
287 mpic = mpic_alloc(mpic_node, openpic_addr,
288 mpic_flags, 0, 0, "PASEMI-OPIC");
289 BUG_ON(!mpic);
290
291 mpic_assign_isu(mpic, 0, mpic->paddr + 0x10000);
292 mpic_init(mpic);
293 /* The NMI/MCK source needs to be prio 15 */
294 if (nmiprop) {
295 nmi_virq = irq_create_mapping(NULL, *nmiprop);
296 mpic_irq_set_priority(nmi_virq, 15);
297 irq_set_irq_type(nmi_virq, IRQ_TYPE_EDGE_RISING);
298 mpic_unmask_irq(irq_get_irq_data(nmi_virq));
299 }
300
301 nemo_init_IRQ(mpic);
302
303 of_node_put(mpic_node);
304 of_node_put(root);
305 }
306
pas_progress(char * s,unsigned short hex)307 static void __init pas_progress(char *s, unsigned short hex)
308 {
309 printk("[%04x] : %s\n", hex, s ? s : "");
310 }
311
312
pas_machine_check_handler(struct pt_regs * regs)313 static int pas_machine_check_handler(struct pt_regs *regs)
314 {
315 int cpu = smp_processor_id();
316 unsigned long srr0, srr1, dsisr;
317 int dump_slb = 0;
318 int i;
319
320 srr0 = regs->nip;
321 srr1 = regs->msr;
322
323 if (nmi_virq && mpic_get_mcirq() == nmi_virq) {
324 pr_err("NMI delivered\n");
325 debugger(regs);
326 mpic_end_irq(irq_get_irq_data(nmi_virq));
327 goto out;
328 }
329
330 dsisr = mfspr(SPRN_DSISR);
331 pr_err("Machine Check on CPU %d\n", cpu);
332 pr_err("SRR0 0x%016lx SRR1 0x%016lx\n", srr0, srr1);
333 pr_err("DSISR 0x%016lx DAR 0x%016lx\n", dsisr, regs->dar);
334 pr_err("BER 0x%016lx MER 0x%016lx\n", mfspr(SPRN_PA6T_BER),
335 mfspr(SPRN_PA6T_MER));
336 pr_err("IER 0x%016lx DER 0x%016lx\n", mfspr(SPRN_PA6T_IER),
337 mfspr(SPRN_PA6T_DER));
338 pr_err("Cause:\n");
339
340 if (srr1 & 0x200000)
341 pr_err("Signalled by SDC\n");
342
343 if (srr1 & 0x100000) {
344 pr_err("Load/Store detected error:\n");
345 if (dsisr & 0x8000)
346 pr_err("D-cache ECC double-bit error or bus error\n");
347 if (dsisr & 0x4000)
348 pr_err("LSU snoop response error\n");
349 if (dsisr & 0x2000) {
350 pr_err("MMU SLB multi-hit or invalid B field\n");
351 dump_slb = 1;
352 }
353 if (dsisr & 0x1000)
354 pr_err("Recoverable Duptags\n");
355 if (dsisr & 0x800)
356 pr_err("Recoverable D-cache parity error count overflow\n");
357 if (dsisr & 0x400)
358 pr_err("TLB parity error count overflow\n");
359 }
360
361 if (srr1 & 0x80000)
362 pr_err("Bus Error\n");
363
364 if (srr1 & 0x40000) {
365 pr_err("I-side SLB multiple hit\n");
366 dump_slb = 1;
367 }
368
369 if (srr1 & 0x20000)
370 pr_err("I-cache parity error hit\n");
371
372 if (num_mce_regs == 0)
373 pr_err("No MCE registers mapped yet, can't dump\n");
374 else
375 pr_err("SoC debug registers:\n");
376
377 for (i = 0; i < num_mce_regs; i++)
378 pr_err("%s: 0x%08x\n", mce_regs[i].name,
379 in_le32(mce_regs[i].addr));
380
381 if (dump_slb) {
382 unsigned long e, v;
383 int i;
384
385 pr_err("slb contents:\n");
386 for (i = 0; i < mmu_slb_size; i++) {
387 asm volatile("slbmfee %0,%1" : "=r" (e) : "r" (i));
388 asm volatile("slbmfev %0,%1" : "=r" (v) : "r" (i));
389 pr_err("%02d %016lx %016lx\n", i, e, v);
390 }
391 }
392
393 out:
394 /* SRR1[62] is from MSR[62] if recoverable, so pass that back */
395 return !!(srr1 & 0x2);
396 }
397
398 static const struct of_device_id pasemi_bus_ids[] = {
399 /* Unfortunately needed for legacy firmwares */
400 { .type = "localbus", },
401 { .type = "sdc", },
402 /* These are the proper entries, which newer firmware uses */
403 { .compatible = "pasemi,localbus", },
404 { .compatible = "pasemi,sdc", },
405 {},
406 };
407
pasemi_publish_devices(void)408 static int __init pasemi_publish_devices(void)
409 {
410 /* Publish OF platform devices for SDC and other non-PCI devices */
411 of_platform_bus_probe(NULL, pasemi_bus_ids, NULL);
412
413 nemo_init_rtc();
414
415 return 0;
416 }
417 machine_device_initcall(pasemi, pasemi_publish_devices);
418
419
420 /*
421 * Called very early, MMU is off, device-tree isn't unflattened
422 */
pas_probe(void)423 static int __init pas_probe(void)
424 {
425 if (!of_machine_is_compatible("PA6T-1682M") &&
426 !of_machine_is_compatible("pasemi,pwrficient"))
427 return 0;
428
429 #ifdef CONFIG_PPC_PASEMI_NEMO
430 /*
431 * Check for the Nemo motherboard here, if we are running on one
432 * change the machine definition to fit
433 */
434 if (of_machine_is_compatible("pasemi,nemo")) {
435 pm_power_off = pas_shutdown;
436 ppc_md.name = "A-EON Amigaone X1000";
437 }
438 #endif
439
440 iommu_init_early_pasemi();
441
442 return 1;
443 }
444
define_machine(pasemi)445 define_machine(pasemi) {
446 .name = "PA Semi PWRficient",
447 .probe = pas_probe,
448 .setup_arch = pas_setup_arch,
449 .discover_phbs = pas_pci_init,
450 .init_IRQ = pas_init_IRQ,
451 .get_irq = mpic_get_irq,
452 .restart = pas_restart,
453 .get_boot_time = pas_get_boot_time,
454 .progress = pas_progress,
455 .machine_check_exception = pas_machine_check_handler,
456 };
457