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treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / arch / alpha / kernel / sys_marvel.c
blob8d34cf6e002a057cd4571eb4e6257fcca695a8e9
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * linux/arch/alpha/kernel/sys_marvel.c
4 *
5 * Marvel / IO7 support
6 */
7
8 #include <linux/kernel.h>
9 #include <linux/types.h>
10 #include <linux/mm.h>
11 #include <linux/sched.h>
12 #include <linux/pci.h>
13 #include <linux/init.h>
14 #include <linux/bitops.h>
15
16 #include <asm/ptrace.h>
17 #include <asm/dma.h>
18 #include <asm/irq.h>
19 #include <asm/mmu_context.h>
20 #include <asm/io.h>
21 #include <asm/pgtable.h>
22 #include <asm/core_marvel.h>
23 #include <asm/hwrpb.h>
24 #include <asm/tlbflush.h>
25 #include <asm/vga.h>
26
27 #include "proto.h"
28 #include "err_impl.h"
29 #include "irq_impl.h"
30 #include "pci_impl.h"
31 #include "machvec_impl.h"
32
33 #if NR_IRQS < MARVEL_NR_IRQS
34 # error NR_IRQS < MARVEL_NR_IRQS !!!
35 #endif
36
37 \f
38 /*
39 * Interrupt handling.
40 */
41 static void
42 io7_device_interrupt(unsigned long vector)
43 {
44 unsigned int pid;
45 unsigned int irq;
46
47 /*
48 * Vector is 0x800 + (interrupt)
49 *
50 * where (interrupt) is:
51 *
52 * ...16|15 14|13 4|3 0
53 * -----+-----+--------+---
54 * PE | 0 | irq | 0
55 *
56 * where (irq) is
57 *
58 * 0x0800 - 0x0ff0 - 0x0800 + (LSI id << 4)
59 * 0x1000 - 0x2ff0 - 0x1000 + (MSI_DAT<8:0> << 4)
60 */
61 pid = vector >> 16;
62 irq = ((vector & 0xffff) - 0x800) >> 4;
63
64 irq += 16; /* offset for legacy */
65 irq &= MARVEL_IRQ_VEC_IRQ_MASK; /* not too many bits */
66 irq |= pid << MARVEL_IRQ_VEC_PE_SHIFT; /* merge the pid */
67
68 handle_irq(irq);
69 }
70
71 static volatile unsigned long *
72 io7_get_irq_ctl(unsigned int irq, struct io7 **pio7)
73 {
74 volatile unsigned long *ctl;
75 unsigned int pid;
76 struct io7 *io7;
77
78 pid = irq >> MARVEL_IRQ_VEC_PE_SHIFT;
79
80 if (!(io7 = marvel_find_io7(pid))) {
81 printk(KERN_ERR
82 "%s for nonexistent io7 -- vec %x, pid %d\n",
83 __func__, irq, pid);
84 return NULL;
85 }
86
87 irq &= MARVEL_IRQ_VEC_IRQ_MASK; /* isolate the vector */
88 irq -= 16; /* subtract legacy bias */
89
90 if (irq >= 0x180) {
91 printk(KERN_ERR
92 "%s for invalid irq -- pid %d adjusted irq %x\n",
93 __func__, pid, irq);
94 return NULL;
95 }
96
97 ctl = &io7->csrs->PO7_LSI_CTL[irq & 0xff].csr; /* assume LSI */
98 if (irq >= 0x80) /* MSI */
99 ctl = &io7->csrs->PO7_MSI_CTL[((irq - 0x80) >> 5) & 0x0f].csr;
100
101 if (pio7) *pio7 = io7;
102 return ctl;
103 }
104
105 static void
106 io7_enable_irq(struct irq_data *d)
107 {
108 volatile unsigned long *ctl;
109 unsigned int irq = d->irq;
110 struct io7 *io7;
111
112 ctl = io7_get_irq_ctl(irq, &io7);
113 if (!ctl || !io7) {
114 printk(KERN_ERR "%s: get_ctl failed for irq %x\n",
115 __func__, irq);
116 return;
117 }
118
119 raw_spin_lock(&io7->irq_lock);
120 *ctl |= 1UL << 24;
121 mb();
122 *ctl;
123 raw_spin_unlock(&io7->irq_lock);
124 }
125
126 static void
127 io7_disable_irq(struct irq_data *d)
128 {
129 volatile unsigned long *ctl;
130 unsigned int irq = d->irq;
131 struct io7 *io7;
132
133 ctl = io7_get_irq_ctl(irq, &io7);
134 if (!ctl || !io7) {
135 printk(KERN_ERR "%s: get_ctl failed for irq %x\n",
136 __func__, irq);
137 return;
138 }
139
140 raw_spin_lock(&io7->irq_lock);
141 *ctl &= ~(1UL << 24);
142 mb();
143 *ctl;
144 raw_spin_unlock(&io7->irq_lock);
145 }
146
147 static void
148 marvel_irq_noop(struct irq_data *d)
149 {
150 return;
151 }
152
153 static struct irq_chip marvel_legacy_irq_type = {
154 .name = "LEGACY",
155 .irq_mask = marvel_irq_noop,
156 .irq_unmask = marvel_irq_noop,
157 };
158
159 static struct irq_chip io7_lsi_irq_type = {
160 .name = "LSI",
161 .irq_unmask = io7_enable_irq,
162 .irq_mask = io7_disable_irq,
163 .irq_mask_ack = io7_disable_irq,
164 };
165
166 static struct irq_chip io7_msi_irq_type = {
167 .name = "MSI",
168 .irq_unmask = io7_enable_irq,
169 .irq_mask = io7_disable_irq,
170 .irq_ack = marvel_irq_noop,
171 };
172
173 static void
174 io7_redirect_irq(struct io7 *io7,
175 volatile unsigned long *csr,
176 unsigned int where)
177 {
178 unsigned long val;
179
180 val = *csr;
181 val &= ~(0x1ffUL << 24); /* clear the target pid */
182 val |= ((unsigned long)where << 24); /* set the new target pid */
183
184 *csr = val;
185 mb();
186 *csr;
187 }
188
189 static void
190 io7_redirect_one_lsi(struct io7 *io7, unsigned int which, unsigned int where)
191 {
192 unsigned long val;
193
194 /*
195 * LSI_CTL has target PID @ 14
196 */
197 val = io7->csrs->PO7_LSI_CTL[which].csr;
198 val &= ~(0x1ffUL << 14); /* clear the target pid */
199 val |= ((unsigned long)where << 14); /* set the new target pid */
200
201 io7->csrs->PO7_LSI_CTL[which].csr = val;
202 mb();
203 io7->csrs->PO7_LSI_CTL[which].csr;
204 }
205
206 static void
207 io7_redirect_one_msi(struct io7 *io7, unsigned int which, unsigned int where)
208 {
209 unsigned long val;
210
211 /*
212 * MSI_CTL has target PID @ 14
213 */
214 val = io7->csrs->PO7_MSI_CTL[which].csr;
215 val &= ~(0x1ffUL << 14); /* clear the target pid */
216 val |= ((unsigned long)where << 14); /* set the new target pid */
217
218 io7->csrs->PO7_MSI_CTL[which].csr = val;
219 mb();
220 io7->csrs->PO7_MSI_CTL[which].csr;
221 }
222
223 static void __init
224 init_one_io7_lsi(struct io7 *io7, unsigned int which, unsigned int where)
225 {
226 /*
227 * LSI_CTL has target PID @ 14
228 */
229 io7->csrs->PO7_LSI_CTL[which].csr = ((unsigned long)where << 14);
230 mb();
231 io7->csrs->PO7_LSI_CTL[which].csr;
232 }
233
234 static void __init
235 init_one_io7_msi(struct io7 *io7, unsigned int which, unsigned int where)
236 {
237 /*
238 * MSI_CTL has target PID @ 14
239 */
240 io7->csrs->PO7_MSI_CTL[which].csr = ((unsigned long)where << 14);
241 mb();
242 io7->csrs->PO7_MSI_CTL[which].csr;
243 }
244
245 static void __init
246 init_io7_irqs(struct io7 *io7,
247 struct irq_chip *lsi_ops,
248 struct irq_chip *msi_ops)
249 {
250 long base = (io7->pe << MARVEL_IRQ_VEC_PE_SHIFT) + 16;
251 long i;
252
253 printk("Initializing interrupts for IO7 at PE %u - base %lx\n",
254 io7->pe, base);
255
256 /*
257 * Where should interrupts from this IO7 go?
258 *
259 * They really should be sent to the local CPU to avoid having to
260 * traverse the mesh, but if it's not an SMP kernel, they have to
261 * go to the boot CPU. Send them all to the boot CPU for now,
262 * as each secondary starts, it can redirect it's local device
263 * interrupts.
264 */
265 printk(" Interrupts reported to CPU at PE %u\n", boot_cpuid);
266
267 raw_spin_lock(&io7->irq_lock);
268
269 /* set up the error irqs */
270 io7_redirect_irq(io7, &io7->csrs->HLT_CTL.csr, boot_cpuid);
271 io7_redirect_irq(io7, &io7->csrs->HPI_CTL.csr, boot_cpuid);
272 io7_redirect_irq(io7, &io7->csrs->CRD_CTL.csr, boot_cpuid);
273 io7_redirect_irq(io7, &io7->csrs->STV_CTL.csr, boot_cpuid);
274 io7_redirect_irq(io7, &io7->csrs->HEI_CTL.csr, boot_cpuid);
275
276 /* Set up the lsi irqs. */
277 for (i = 0; i < 128; ++i) {
278 irq_set_chip_and_handler(base + i, lsi_ops, handle_level_irq);
279 irq_set_status_flags(i, IRQ_LEVEL);
280 }
281
282 /* Disable the implemented irqs in hardware. */
283 for (i = 0; i < 0x60; ++i)
284 init_one_io7_lsi(io7, i, boot_cpuid);
285
286 init_one_io7_lsi(io7, 0x74, boot_cpuid);
287 init_one_io7_lsi(io7, 0x75, boot_cpuid);
288
289
290 /* Set up the msi irqs. */
291 for (i = 128; i < (128 + 512); ++i) {
292 irq_set_chip_and_handler(base + i, msi_ops, handle_level_irq);
293 irq_set_status_flags(i, IRQ_LEVEL);
294 }
295
296 for (i = 0; i < 16; ++i)
297 init_one_io7_msi(io7, i, boot_cpuid);
298
299 raw_spin_unlock(&io7->irq_lock);
300 }
301
302 static void __init
303 marvel_init_irq(void)
304 {
305 int i;
306 struct io7 *io7 = NULL;
307
308 /* Reserve the legacy irqs. */
309 for (i = 0; i < 16; ++i) {
310 irq_set_chip_and_handler(i, &marvel_legacy_irq_type,
311 handle_level_irq);
312 }
313
314 /* Init the io7 irqs. */
315 for (io7 = NULL; (io7 = marvel_next_io7(io7)) != NULL; )
316 init_io7_irqs(io7, &io7_lsi_irq_type, &io7_msi_irq_type);
317 }
318
319 static int
320 marvel_map_irq(const struct pci_dev *cdev, u8 slot, u8 pin)
321 {
322 struct pci_dev *dev = (struct pci_dev *)cdev;
323 struct pci_controller *hose = dev->sysdata;
324 struct io7_port *io7_port = hose->sysdata;
325 struct io7 *io7 = io7_port->io7;
326 int msi_loc, msi_data_off;
327 u16 msg_ctl;
328 u16 msg_dat;
329 u8 intline;
330 int irq;
331
332 pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &intline);
333 irq = intline;
334
335 msi_loc = dev->msi_cap;
336 msg_ctl = 0;
337 if (msi_loc)
338 pci_read_config_word(dev, msi_loc + PCI_MSI_FLAGS, &msg_ctl);
339
340 if (msg_ctl & PCI_MSI_FLAGS_ENABLE) {
341 msi_data_off = PCI_MSI_DATA_32;
342 if (msg_ctl & PCI_MSI_FLAGS_64BIT)
343 msi_data_off = PCI_MSI_DATA_64;
344 pci_read_config_word(dev, msi_loc + msi_data_off, &msg_dat);
345
346 irq = msg_dat & 0x1ff; /* we use msg_data<8:0> */
347 irq += 0x80; /* offset for lsi */
348
349 #if 1
350 printk("PCI:%d:%d:%d (hose %d) is using MSI\n",
351 dev->bus->number,
352 PCI_SLOT(dev->devfn),
353 PCI_FUNC(dev->devfn),
354 hose->index);
355 printk(" %d message(s) from 0x%04x\n",
356 1 << ((msg_ctl & PCI_MSI_FLAGS_QSIZE) >> 4),
357 msg_dat);
358 printk(" reporting on %d IRQ(s) from %d (0x%x)\n",
359 1 << ((msg_ctl & PCI_MSI_FLAGS_QSIZE) >> 4),
360 (irq + 16) | (io7->pe << MARVEL_IRQ_VEC_PE_SHIFT),
361 (irq + 16) | (io7->pe << MARVEL_IRQ_VEC_PE_SHIFT));
362 #endif
363
364 #if 0
365 pci_write_config_word(dev, msi_loc + PCI_MSI_FLAGS,
366 msg_ctl & ~PCI_MSI_FLAGS_ENABLE);
367 pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &intline);
368 irq = intline;
369
370 printk(" forcing LSI interrupt on irq %d [0x%x]\n", irq, irq);
371 #endif
372 }
373
374 irq += 16; /* offset for legacy */
375 irq |= io7->pe << MARVEL_IRQ_VEC_PE_SHIFT; /* merge the pid */
376
377 return irq;
378 }
379
380 static void __init
381 marvel_init_pci(void)
382 {
383 struct io7 *io7;
384
385 marvel_register_error_handlers();
386
387 /* Indicate that we trust the console to configure things properly */
388 pci_set_flags(PCI_PROBE_ONLY);
389 common_init_pci();
390 locate_and_init_vga(NULL);
391
392 /* Clear any io7 errors. */
393 for (io7 = NULL; (io7 = marvel_next_io7(io7)) != NULL; )
394 io7_clear_errors(io7);
395 }
396
397 static void __init
398 marvel_init_rtc(void)
399 {
400 init_rtc_irq();
401 }
402
403 static void
404 marvel_smp_callin(void)
405 {
406 int cpuid = hard_smp_processor_id();
407 struct io7 *io7 = marvel_find_io7(cpuid);
408 unsigned int i;
409
410 if (!io7)
411 return;
412
413 /*
414 * There is a local IO7 - redirect all of its interrupts here.
415 */
416 printk("Redirecting IO7 interrupts to local CPU at PE %u\n", cpuid);
417
418 /* Redirect the error IRQS here. */
419 io7_redirect_irq(io7, &io7->csrs->HLT_CTL.csr, cpuid);
420 io7_redirect_irq(io7, &io7->csrs->HPI_CTL.csr, cpuid);
421 io7_redirect_irq(io7, &io7->csrs->CRD_CTL.csr, cpuid);
422 io7_redirect_irq(io7, &io7->csrs->STV_CTL.csr, cpuid);
423 io7_redirect_irq(io7, &io7->csrs->HEI_CTL.csr, cpuid);
424
425 /* Redirect the implemented LSIs here. */
426 for (i = 0; i < 0x60; ++i)
427 io7_redirect_one_lsi(io7, i, cpuid);
428
429 io7_redirect_one_lsi(io7, 0x74, cpuid);
430 io7_redirect_one_lsi(io7, 0x75, cpuid);
431
432 /* Redirect the MSIs here. */
433 for (i = 0; i < 16; ++i)
434 io7_redirect_one_msi(io7, i, cpuid);
435 }
436 \f
437 /*
438 * System Vectors
439 */
440 struct alpha_machine_vector marvel_ev7_mv __initmv = {
441 .vector_name = "MARVEL/EV7",
442 DO_EV7_MMU,
443 .rtc_port = 0x70,
444 .rtc_boot_cpu_only = 1,
445 DO_MARVEL_IO,
446 .machine_check = marvel_machine_check,
447 .max_isa_dma_address = ALPHA_MAX_ISA_DMA_ADDRESS,
448 .min_io_address = DEFAULT_IO_BASE,
449 .min_mem_address = DEFAULT_MEM_BASE,
450 .pci_dac_offset = IO7_DAC_OFFSET,
451
452 .nr_irqs = MARVEL_NR_IRQS,
453 .device_interrupt = io7_device_interrupt,
454
455 .agp_info = marvel_agp_info,
456
457 .smp_callin = marvel_smp_callin,
458 .init_arch = marvel_init_arch,
459 .init_irq = marvel_init_irq,
460 .init_rtc = marvel_init_rtc,
461 .init_pci = marvel_init_pci,
462 .kill_arch = marvel_kill_arch,
463 .pci_map_irq = marvel_map_irq,
464 .pci_swizzle = common_swizzle,
465
466 .pa_to_nid = marvel_pa_to_nid,
467 .cpuid_to_nid = marvel_cpuid_to_nid,
468 .node_mem_start = marvel_node_mem_start,
469 .node_mem_size = marvel_node_mem_size,
470 };
471 ALIAS_MV(marvel_ev7)
Linux with added FPC-III support