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_platform.h>
20 #include <linux/gfp.h>
21
22 #include <asm/prom.h>
23 #include <asm/iommu.h>
24 #include <asm/machdep.h>
25 #include <asm/i8259.h>
26 #include <asm/mpic.h>
27 #include <asm/smp.h>
28 #include <asm/time.h>
29 #include <asm/mmu.h>
30 #include <asm/debug.h>
31
32 #include <pcmcia/ss.h>
33 #include <pcmcia/cistpl.h>
34 #include <pcmcia/ds.h>
35
36 #include "pasemi.h"
37
38 /* SDC reset register, must be pre-mapped at reset time */
39 static void __iomem *reset_reg;
40
41 /* Various error status registers, must be pre-mapped at MCE time */
42
43 #define MAX_MCE_REGS 32
44 struct mce_regs {
45 char *name;
46 void __iomem *addr;
47 };
48
49 static struct mce_regs mce_regs[MAX_MCE_REGS];
50 static int num_mce_regs;
51 static int nmi_virq = 0;
52
53
pas_restart(char * cmd)54 static void __noreturn pas_restart(char *cmd)
55 {
56 /* Need to put others cpu in hold loop so they're not sleeping */
57 smp_send_stop();
58 udelay(10000);
59 printk("Restarting...\n");
60 while (1)
61 out_le32(reset_reg, 0x6000000);
62 }
63
64 #ifdef CONFIG_PPC_PASEMI_NEMO
pas_shutdown(void)65 void pas_shutdown(void)
66 {
67 /* Set the PLD bit that makes the SB600 think the power button is being pressed */
68 void __iomem *pld_map = ioremap(0xf5000000,4096);
69 while (1)
70 out_8(pld_map+7,0x01);
71 }
72
73 /* RTC platform device structure as is not in device tree */
74 static struct resource rtc_resource[] = {{
75 .name = "rtc",
76 .start = 0x70,
77 .end = 0x71,
78 .flags = IORESOURCE_IO,
79 }, {
80 .name = "rtc",
81 .start = 8,
82 .end = 8,
83 .flags = IORESOURCE_IRQ,
84 }};
85
nemo_init_rtc(void)86 static inline void nemo_init_rtc(void)
87 {
88 platform_device_register_simple("rtc_cmos", -1, rtc_resource, 2);
89 }
90
91 #else
92
nemo_init_rtc(void)93 static inline void nemo_init_rtc(void)
94 {
95 }
96 #endif
97
98 #ifdef CONFIG_SMP
99 static arch_spinlock_t timebase_lock;
100 static unsigned long timebase;
101
pas_give_timebase(void)102 static void pas_give_timebase(void)
103 {
104 unsigned long flags;
105
106 local_irq_save(flags);
107 hard_irq_disable();
108 arch_spin_lock(&timebase_lock);
109 mtspr(SPRN_TBCTL, TBCTL_FREEZE);
110 isync();
111 timebase = get_tb();
112 arch_spin_unlock(&timebase_lock);
113
114 while (timebase)
115 barrier();
116 mtspr(SPRN_TBCTL, TBCTL_RESTART);
117 local_irq_restore(flags);
118 }
119
pas_take_timebase(void)120 static void pas_take_timebase(void)
121 {
122 while (!timebase)
123 smp_rmb();
124
125 arch_spin_lock(&timebase_lock);
126 set_tb(timebase >> 32, timebase & 0xffffffff);
127 timebase = 0;
128 arch_spin_unlock(&timebase_lock);
129 }
130
131 static struct smp_ops_t pas_smp_ops = {
132 .probe = smp_mpic_probe,
133 .message_pass = smp_mpic_message_pass,
134 .kick_cpu = smp_generic_kick_cpu,
135 .setup_cpu = smp_mpic_setup_cpu,
136 .give_timebase = pas_give_timebase,
137 .take_timebase = pas_take_timebase,
138 };
139 #endif /* CONFIG_SMP */
140
pas_setup_arch(void)141 static void __init pas_setup_arch(void)
142 {
143 #ifdef CONFIG_SMP
144 /* Setup SMP callback */
145 smp_ops = &pas_smp_ops;
146 #endif
147 /* Lookup PCI hosts */
148 pas_pci_init();
149
150 #ifdef CONFIG_DUMMY_CONSOLE
151 conswitchp = &dummy_con;
152 #endif
153
154 /* Remap SDC register for doing reset */
155 /* XXXOJN This should maybe come out of the device tree */
156 reset_reg = ioremap(0xfc101100, 4);
157 }
158
pas_setup_mce_regs(void)159 static int __init pas_setup_mce_regs(void)
160 {
161 struct pci_dev *dev;
162 int reg;
163
164 /* Remap various SoC status registers for use by the MCE handler */
165
166 reg = 0;
167
168 dev = pci_get_device(PCI_VENDOR_ID_PASEMI, 0xa00a, NULL);
169 while (dev && reg < MAX_MCE_REGS) {
170 mce_regs[reg].name = kasprintf(GFP_KERNEL,
171 "mc%d_mcdebug_errsta", reg);
172 mce_regs[reg].addr = pasemi_pci_getcfgaddr(dev, 0x730);
173 dev = pci_get_device(PCI_VENDOR_ID_PASEMI, 0xa00a, dev);
174 reg++;
175 }
176
177 dev = pci_get_device(PCI_VENDOR_ID_PASEMI, 0xa001, NULL);
178 if (dev && reg+4 < MAX_MCE_REGS) {
179 mce_regs[reg].name = "iobdbg_IntStatus1";
180 mce_regs[reg].addr = pasemi_pci_getcfgaddr(dev, 0x438);
181 reg++;
182 mce_regs[reg].name = "iobdbg_IOCTbusIntDbgReg";
183 mce_regs[reg].addr = pasemi_pci_getcfgaddr(dev, 0x454);
184 reg++;
185 mce_regs[reg].name = "iobiom_IntStatus";
186 mce_regs[reg].addr = pasemi_pci_getcfgaddr(dev, 0xc10);
187 reg++;
188 mce_regs[reg].name = "iobiom_IntDbgReg";
189 mce_regs[reg].addr = pasemi_pci_getcfgaddr(dev, 0xc1c);
190 reg++;
191 }
192
193 dev = pci_get_device(PCI_VENDOR_ID_PASEMI, 0xa009, NULL);
194 if (dev && reg+2 < MAX_MCE_REGS) {
195 mce_regs[reg].name = "l2csts_IntStatus";
196 mce_regs[reg].addr = pasemi_pci_getcfgaddr(dev, 0x200);
197 reg++;
198 mce_regs[reg].name = "l2csts_Cnt";
199 mce_regs[reg].addr = pasemi_pci_getcfgaddr(dev, 0x214);
200 reg++;
201 }
202
203 num_mce_regs = reg;
204
205 return 0;
206 }
207 machine_device_initcall(pasemi, pas_setup_mce_regs);
208
209 #ifdef CONFIG_PPC_PASEMI_NEMO
sb600_8259_cascade(struct irq_desc * desc)210 static void sb600_8259_cascade(struct irq_desc *desc)
211 {
212 struct irq_chip *chip = irq_desc_get_chip(desc);
213 unsigned int cascade_irq = i8259_irq();
214
215 if (cascade_irq)
216 generic_handle_irq(cascade_irq);
217
218 chip->irq_eoi(&desc->irq_data);
219 }
220
nemo_init_IRQ(struct mpic * mpic)221 static void nemo_init_IRQ(struct mpic *mpic)
222 {
223 struct device_node *np;
224 int gpio_virq;
225 /* Connect the SB600's legacy i8259 controller */
226 np = of_find_node_by_path("/pxp@0,e0000000");
227 i8259_init(np, 0);
228 of_node_put(np);
229
230 gpio_virq = irq_create_mapping(NULL, 3);
231 irq_set_irq_type(gpio_virq, IRQ_TYPE_LEVEL_HIGH);
232 irq_set_chained_handler(gpio_virq, sb600_8259_cascade);
233 mpic_unmask_irq(irq_get_irq_data(gpio_virq));
234
235 irq_set_default_host(mpic->irqhost);
236 }
237
238 #else
239
nemo_init_IRQ(struct mpic * mpic)240 static inline void nemo_init_IRQ(struct mpic *mpic)
241 {
242 }
243 #endif
244
pas_init_IRQ(void)245 static __init void pas_init_IRQ(void)
246 {
247 struct device_node *np;
248 struct device_node *root, *mpic_node;
249 unsigned long openpic_addr;
250 const unsigned int *opprop;
251 int naddr, opplen;
252 int mpic_flags;
253 const unsigned int *nmiprop;
254 struct mpic *mpic;
255
256 mpic_node = NULL;
257
258 for_each_node_by_type(np, "interrupt-controller")
259 if (of_device_is_compatible(np, "open-pic")) {
260 mpic_node = np;
261 break;
262 }
263 if (!mpic_node)
264 for_each_node_by_type(np, "open-pic") {
265 mpic_node = np;
266 break;
267 }
268 if (!mpic_node) {
269 pr_err("Failed to locate the MPIC interrupt controller\n");
270 return;
271 }
272
273 /* Find address list in /platform-open-pic */
274 root = of_find_node_by_path("/");
275 naddr = of_n_addr_cells(root);
276 opprop = of_get_property(root, "platform-open-pic", &opplen);
277 if (!opprop) {
278 pr_err("No platform-open-pic property.\n");
279 of_node_put(root);
280 return;
281 }
282 openpic_addr = of_read_number(opprop, naddr);
283 pr_debug("OpenPIC addr: %lx\n", openpic_addr);
284
285 mpic_flags = MPIC_LARGE_VECTORS | MPIC_NO_BIAS | MPIC_NO_RESET;
286
287 nmiprop = of_get_property(mpic_node, "nmi-source", NULL);
288 if (nmiprop)
289 mpic_flags |= MPIC_ENABLE_MCK;
290
291 mpic = mpic_alloc(mpic_node, openpic_addr,
292 mpic_flags, 0, 0, "PASEMI-OPIC");
293 BUG_ON(!mpic);
294
295 mpic_assign_isu(mpic, 0, mpic->paddr + 0x10000);
296 mpic_init(mpic);
297 /* The NMI/MCK source needs to be prio 15 */
298 if (nmiprop) {
299 nmi_virq = irq_create_mapping(NULL, *nmiprop);
300 mpic_irq_set_priority(nmi_virq, 15);
301 irq_set_irq_type(nmi_virq, IRQ_TYPE_EDGE_RISING);
302 mpic_unmask_irq(irq_get_irq_data(nmi_virq));
303 }
304
305 nemo_init_IRQ(mpic);
306
307 of_node_put(mpic_node);
308 of_node_put(root);
309 }
310
pas_progress(char * s,unsigned short hex)311 static void __init pas_progress(char *s, unsigned short hex)
312 {
313 printk("[%04x] : %s\n", hex, s ? s : "");
314 }
315
316
pas_machine_check_handler(struct pt_regs * regs)317 static int pas_machine_check_handler(struct pt_regs *regs)
318 {
319 int cpu = smp_processor_id();
320 unsigned long srr0, srr1, dsisr;
321 int dump_slb = 0;
322 int i;
323
324 srr0 = regs->nip;
325 srr1 = regs->msr;
326
327 if (nmi_virq && mpic_get_mcirq() == nmi_virq) {
328 pr_err("NMI delivered\n");
329 debugger(regs);
330 mpic_end_irq(irq_get_irq_data(nmi_virq));
331 goto out;
332 }
333
334 dsisr = mfspr(SPRN_DSISR);
335 pr_err("Machine Check on CPU %d\n", cpu);
336 pr_err("SRR0 0x%016lx SRR1 0x%016lx\n", srr0, srr1);
337 pr_err("DSISR 0x%016lx DAR 0x%016lx\n", dsisr, regs->dar);
338 pr_err("BER 0x%016lx MER 0x%016lx\n", mfspr(SPRN_PA6T_BER),
339 mfspr(SPRN_PA6T_MER));
340 pr_err("IER 0x%016lx DER 0x%016lx\n", mfspr(SPRN_PA6T_IER),
341 mfspr(SPRN_PA6T_DER));
342 pr_err("Cause:\n");
343
344 if (srr1 & 0x200000)
345 pr_err("Signalled by SDC\n");
346
347 if (srr1 & 0x100000) {
348 pr_err("Load/Store detected error:\n");
349 if (dsisr & 0x8000)
350 pr_err("D-cache ECC double-bit error or bus error\n");
351 if (dsisr & 0x4000)
352 pr_err("LSU snoop response error\n");
353 if (dsisr & 0x2000) {
354 pr_err("MMU SLB multi-hit or invalid B field\n");
355 dump_slb = 1;
356 }
357 if (dsisr & 0x1000)
358 pr_err("Recoverable Duptags\n");
359 if (dsisr & 0x800)
360 pr_err("Recoverable D-cache parity error count overflow\n");
361 if (dsisr & 0x400)
362 pr_err("TLB parity error count overflow\n");
363 }
364
365 if (srr1 & 0x80000)
366 pr_err("Bus Error\n");
367
368 if (srr1 & 0x40000) {
369 pr_err("I-side SLB multiple hit\n");
370 dump_slb = 1;
371 }
372
373 if (srr1 & 0x20000)
374 pr_err("I-cache parity error hit\n");
375
376 if (num_mce_regs == 0)
377 pr_err("No MCE registers mapped yet, can't dump\n");
378 else
379 pr_err("SoC debug registers:\n");
380
381 for (i = 0; i < num_mce_regs; i++)
382 pr_err("%s: 0x%08x\n", mce_regs[i].name,
383 in_le32(mce_regs[i].addr));
384
385 if (dump_slb) {
386 unsigned long e, v;
387 int i;
388
389 pr_err("slb contents:\n");
390 for (i = 0; i < mmu_slb_size; i++) {
391 asm volatile("slbmfee %0,%1" : "=r" (e) : "r" (i));
392 asm volatile("slbmfev %0,%1" : "=r" (v) : "r" (i));
393 pr_err("%02d %016lx %016lx\n", i, e, v);
394 }
395 }
396
397 out:
398 /* SRR1[62] is from MSR[62] if recoverable, so pass that back */
399 return !!(srr1 & 0x2);
400 }
401
402 static const struct of_device_id pasemi_bus_ids[] = {
403 /* Unfortunately needed for legacy firmwares */
404 { .type = "localbus", },
405 { .type = "sdc", },
406 /* These are the proper entries, which newer firmware uses */
407 { .compatible = "pasemi,localbus", },
408 { .compatible = "pasemi,sdc", },
409 {},
410 };
411
pasemi_publish_devices(void)412 static int __init pasemi_publish_devices(void)
413 {
414 /* Publish OF platform devices for SDC and other non-PCI devices */
415 of_platform_bus_probe(NULL, pasemi_bus_ids, NULL);
416
417 nemo_init_rtc();
418
419 return 0;
420 }
421 machine_device_initcall(pasemi, pasemi_publish_devices);
422
423
424 /*
425 * Called very early, MMU is off, device-tree isn't unflattened
426 */
pas_probe(void)427 static int __init pas_probe(void)
428 {
429 if (!of_machine_is_compatible("PA6T-1682M") &&
430 !of_machine_is_compatible("pasemi,pwrficient"))
431 return 0;
432
433 #ifdef CONFIG_PPC_PASEMI_NEMO
434 /*
435 * Check for the Nemo motherboard here, if we are running on one
436 * change the machine definition to fit
437 */
438 if (of_machine_is_compatible("pasemi,nemo")) {
439 pm_power_off = pas_shutdown;
440 ppc_md.name = "A-EON Amigaone X1000";
441 }
442 #endif
443
444 iommu_init_early_pasemi();
445
446 return 1;
447 }
448
define_machine(pasemi)449 define_machine(pasemi) {
450 .name = "PA Semi PWRficient",
451 .probe = pas_probe,
452 .setup_arch = pas_setup_arch,
453 .init_IRQ = pas_init_IRQ,
454 .get_irq = mpic_get_irq,
455 .restart = pas_restart,
456 .get_boot_time = pas_get_boot_time,
457 .calibrate_decr = generic_calibrate_decr,
458 .progress = pas_progress,
459 .machine_check_exception = pas_machine_check_handler,
460 };
461
