xref: /openbmc/linux/arch/alpha/kernel/core_tsunami.c (revision c796f021) 
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  *	linux/arch/alpha/kernel/core_tsunami.c
4  *
5  * Based on code written by David A. Rusling (david.rusling@reo.mts.dec.com).
6  *
7  * Code common to all TSUNAMI core logic chips.
8  */
9 
10 #define __EXTERN_INLINE inline
11 #include <asm/io.h>
12 #include <asm/core_tsunami.h>
13 #undef __EXTERN_INLINE
14 
15 #include <linux/module.h>
16 #include <linux/types.h>
17 #include <linux/pci.h>
18 #include <linux/sched.h>
19 #include <linux/init.h>
20 #include <linux/memblock.h>
21 
22 #include <asm/ptrace.h>
23 #include <asm/smp.h>
24 #include <asm/vga.h>
25 
26 #include "proto.h"
27 #include "pci_impl.h"
28 
29 /* Save Tsunami configuration data as the console had it set up.  */
30 
31 struct
32 {
33 	unsigned long wsba[4];
34 	unsigned long wsm[4];
35 	unsigned long tba[4];
36 } saved_config[2] __attribute__((common));
37 
38 /*
39  * NOTE: Herein lie back-to-back mb instructions.  They are magic.
40  * One plausible explanation is that the I/O controller does not properly
41  * handle the system transaction.  Another involves timing.  Ho hum.
42  */
43 
44 /*
45  * BIOS32-style PCI interface:
46  */
47 
48 #define DEBUG_CONFIG 0
49 
50 #if DEBUG_CONFIG
51 # define DBG_CFG(args)	printk args
52 #else
53 # define DBG_CFG(args)
54 #endif
55 
56 
57 /*
58  * Given a bus, device, and function number, compute resulting
59  * configuration space address
60  * accordingly.  It is therefore not safe to have concurrent
61  * invocations to configuration space access routines, but there
62  * really shouldn't be any need for this.
63  *
64  * Note that all config space accesses use Type 1 address format.
65  *
66  * Note also that type 1 is determined by non-zero bus number.
67  *
68  * Type 1:
69  *
70  *  3 3|3 3 2 2|2 2 2 2|2 2 2 2|1 1 1 1|1 1 1 1|1 1
71  *  3 2|1 0 9 8|7 6 5 4|3 2 1 0|9 8 7 6|5 4 3 2|1 0 9 8|7 6 5 4|3 2 1 0
72  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
73  * | | | | | | | | | | |B|B|B|B|B|B|B|B|D|D|D|D|D|F|F|F|R|R|R|R|R|R|0|1|
74  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
75  *
76  *	31:24	reserved
77  *	23:16	bus number (8 bits = 128 possible buses)
78  *	15:11	Device number (5 bits)
79  *	10:8	function number
80  *	 7:2	register number
81  *
82  * Notes:
83  *	The function number selects which function of a multi-function device
84  *	(e.g., SCSI and Ethernet).
85  *
86  *	The register selects a DWORD (32 bit) register offset.  Hence it
87  *	doesn't get shifted by 2 bits as we want to "drop" the bottom two
88  *	bits.
89  */
90 
91 static int
92 mk_conf_addr(struct pci_bus *pbus, unsigned int device_fn, int where,
93 	     unsigned long *pci_addr, unsigned char *type1)
94 {
95 	struct pci_controller *hose = pbus->sysdata;
96 	unsigned long addr;
97 	u8 bus = pbus->number;
98 
99 	DBG_CFG(("mk_conf_addr(bus=%d ,device_fn=0x%x, where=0x%x, "
100 		 "pci_addr=0x%p, type1=0x%p)\n",
101 		 bus, device_fn, where, pci_addr, type1));
102 
103 	if (!pbus->parent) /* No parent means peer PCI bus. */
104 		bus = 0;
105 	*type1 = (bus != 0);
106 
107 	addr = (bus << 16) | (device_fn << 8) | where;
108 	addr |= hose->config_space_base;
109 
110 	*pci_addr = addr;
111 	DBG_CFG(("mk_conf_addr: returning pci_addr 0x%lx\n", addr));
112 	return 0;
113 }
114 
115 static int
116 tsunami_read_config(struct pci_bus *bus, unsigned int devfn, int where,
117 		    int size, u32 *value)
118 {
119 	unsigned long addr;
120 	unsigned char type1;
121 
122 	if (mk_conf_addr(bus, devfn, where, &addr, &type1))
123 		return PCIBIOS_DEVICE_NOT_FOUND;
124 
125 	switch (size) {
126 	case 1:
127 		*value = __kernel_ldbu(*(vucp)addr);
128 		break;
129 	case 2:
130 		*value = __kernel_ldwu(*(vusp)addr);
131 		break;
132 	case 4:
133 		*value = *(vuip)addr;
134 		break;
135 	}
136 
137 	return PCIBIOS_SUCCESSFUL;
138 }
139 
140 static int
141 tsunami_write_config(struct pci_bus *bus, unsigned int devfn, int where,
142 		     int size, u32 value)
143 {
144 	unsigned long addr;
145 	unsigned char type1;
146 
147 	if (mk_conf_addr(bus, devfn, where, &addr, &type1))
148 		return PCIBIOS_DEVICE_NOT_FOUND;
149 
150 	switch (size) {
151 	case 1:
152 		__kernel_stb(value, *(vucp)addr);
153 		mb();
154 		__kernel_ldbu(*(vucp)addr);
155 		break;
156 	case 2:
157 		__kernel_stw(value, *(vusp)addr);
158 		mb();
159 		__kernel_ldwu(*(vusp)addr);
160 		break;
161 	case 4:
162 		*(vuip)addr = value;
163 		mb();
164 		*(vuip)addr;
165 		break;
166 	}
167 
168 	return PCIBIOS_SUCCESSFUL;
169 }
170 
171 struct pci_ops tsunami_pci_ops =
172 {
173 	.read =		tsunami_read_config,
174 	.write = 	tsunami_write_config,
175 };
176 
177 void
178 tsunami_pci_tbi(struct pci_controller *hose, dma_addr_t start, dma_addr_t end)
179 {
180 	tsunami_pchip *pchip = hose->index ? TSUNAMI_pchip1 : TSUNAMI_pchip0;
181 	volatile unsigned long *csr;
182 	unsigned long value;
183 
184 	/* We can invalidate up to 8 tlb entries in a go.  The flush
185 	   matches against <31:16> in the pci address.  */
186 	csr = &pchip->tlbia.csr;
187 	if (((start ^ end) & 0xffff0000) == 0)
188 		csr = &pchip->tlbiv.csr;
189 
190 	/* For TBIA, it doesn't matter what value we write.  For TBI,
191 	   it's the shifted tag bits.  */
192 	value = (start & 0xffff0000) >> 12;
193 
194 	*csr = value;
195 	mb();
196 	*csr;
197 }
198 
199 #ifdef NXM_MACHINE_CHECKS_ON_TSUNAMI
200 static long __init
201 tsunami_probe_read(volatile unsigned long *vaddr)
202 {
203 	long dont_care, probe_result;
204 	int cpu = smp_processor_id();
205 	int s = swpipl(IPL_MCHECK - 1);
206 
207 	mcheck_taken(cpu) = 0;
208 	mcheck_expected(cpu) = 1;
209 	mb();
210 	dont_care = *vaddr;
211 	draina();
212 	mcheck_expected(cpu) = 0;
213 	probe_result = !mcheck_taken(cpu);
214 	mcheck_taken(cpu) = 0;
215 	setipl(s);
216 
217 	printk("dont_care == 0x%lx\n", dont_care);
218 
219 	return probe_result;
220 }
221 
222 static long __init
223 tsunami_probe_write(volatile unsigned long *vaddr)
224 {
225 	long true_contents, probe_result = 1;
226 
227 	TSUNAMI_cchip->misc.csr |= (1L << 28); /* clear NXM... */
228 	true_contents = *vaddr;
229 	*vaddr = 0;
230 	draina();
231 	if (TSUNAMI_cchip->misc.csr & (1L << 28)) {
232 		int source = (TSUNAMI_cchip->misc.csr >> 29) & 7;
233 		TSUNAMI_cchip->misc.csr |= (1L << 28); /* ...and unlock NXS. */
234 		probe_result = 0;
235 		printk("tsunami_probe_write: unit %d at 0x%016lx\n", source,
236 		       (unsigned long)vaddr);
237 	}
238 	if (probe_result)
239 		*vaddr = true_contents;
240 	return probe_result;
241 }
242 #else
243 #define tsunami_probe_read(ADDR) 1
244 #endif /* NXM_MACHINE_CHECKS_ON_TSUNAMI */
245 
246 static void __init
247 tsunami_init_one_pchip(tsunami_pchip *pchip, int index)
248 {
249 	struct pci_controller *hose;
250 
251 	if (tsunami_probe_read(&pchip->pctl.csr) == 0)
252 		return;
253 
254 	hose = alloc_pci_controller();
255 	if (index == 0)
256 		pci_isa_hose = hose;
257 	hose->io_space = alloc_resource();
258 	hose->mem_space = alloc_resource();
259 
260 	/* This is for userland consumption.  For some reason, the 40-bit
261 	   PIO bias that we use in the kernel through KSEG didn't work for
262 	   the page table based user mappings.  So make sure we get the
263 	   43-bit PIO bias.  */
264 	hose->sparse_mem_base = 0;
265 	hose->sparse_io_base = 0;
266 	hose->dense_mem_base
267 	  = (TSUNAMI_MEM(index) & 0xffffffffffL) | 0x80000000000L;
268 	hose->dense_io_base
269 	  = (TSUNAMI_IO(index) & 0xffffffffffL) | 0x80000000000L;
270 
271 	hose->config_space_base = TSUNAMI_CONF(index);
272 	hose->index = index;
273 
274 	hose->io_space->start = TSUNAMI_IO(index) - TSUNAMI_IO_BIAS;
275 	hose->io_space->end = hose->io_space->start + TSUNAMI_IO_SPACE - 1;
276 	hose->io_space->name = pci_io_names[index];
277 	hose->io_space->flags = IORESOURCE_IO;
278 
279 	hose->mem_space->start = TSUNAMI_MEM(index) - TSUNAMI_MEM_BIAS;
280 	hose->mem_space->end = hose->mem_space->start + 0xffffffff;
281 	hose->mem_space->name = pci_mem_names[index];
282 	hose->mem_space->flags = IORESOURCE_MEM;
283 
284 	if (request_resource(&ioport_resource, hose->io_space) < 0)
285 		printk(KERN_ERR "Failed to request IO on hose %d\n", index);
286 	if (request_resource(&iomem_resource, hose->mem_space) < 0)
287 		printk(KERN_ERR "Failed to request MEM on hose %d\n", index);
288 
289 	/*
290 	 * Save the existing PCI window translations.  SRM will
291 	 * need them when we go to reboot.
292 	 */
293 
294 	saved_config[index].wsba[0] = pchip->wsba[0].csr;
295 	saved_config[index].wsm[0] = pchip->wsm[0].csr;
296 	saved_config[index].tba[0] = pchip->tba[0].csr;
297 
298 	saved_config[index].wsba[1] = pchip->wsba[1].csr;
299 	saved_config[index].wsm[1] = pchip->wsm[1].csr;
300 	saved_config[index].tba[1] = pchip->tba[1].csr;
301 
302 	saved_config[index].wsba[2] = pchip->wsba[2].csr;
303 	saved_config[index].wsm[2] = pchip->wsm[2].csr;
304 	saved_config[index].tba[2] = pchip->tba[2].csr;
305 
306 	saved_config[index].wsba[3] = pchip->wsba[3].csr;
307 	saved_config[index].wsm[3] = pchip->wsm[3].csr;
308 	saved_config[index].tba[3] = pchip->tba[3].csr;
309 
310 	/*
311 	 * Set up the PCI to main memory translation windows.
312 	 *
313 	 * Note: Window 3 is scatter-gather only
314 	 *
315 	 * Window 0 is scatter-gather 8MB at 8MB (for isa)
316 	 * Window 1 is scatter-gather (up to) 1GB at 1GB
317 	 * Window 2 is direct access 2GB at 2GB
318 	 *
319 	 * NOTE: we need the align_entry settings for Acer devices on ES40,
320 	 * specifically floppy and IDE when memory is larger than 2GB.
321 	 */
322 	hose->sg_isa = iommu_arena_new(hose, 0x00800000, 0x00800000,
323 				       SMP_CACHE_BYTES);
324 	/* Initially set for 4 PTEs, but will be overridden to 64K for ISA. */
325         hose->sg_isa->align_entry = 4;
326 
327 	hose->sg_pci = iommu_arena_new(hose, 0x40000000,
328 				       size_for_memory(0x40000000),
329 				       SMP_CACHE_BYTES);
330         hose->sg_pci->align_entry = 4; /* Tsunami caches 4 PTEs at a time */
331 
332 	__direct_map_base = 0x80000000;
333 	__direct_map_size = 0x80000000;
334 
335 	pchip->wsba[0].csr = hose->sg_isa->dma_base | 3;
336 	pchip->wsm[0].csr  = (hose->sg_isa->size - 1) & 0xfff00000;
337 	pchip->tba[0].csr  = virt_to_phys(hose->sg_isa->ptes);
338 
339 	pchip->wsba[1].csr = hose->sg_pci->dma_base | 3;
340 	pchip->wsm[1].csr  = (hose->sg_pci->size - 1) & 0xfff00000;
341 	pchip->tba[1].csr  = virt_to_phys(hose->sg_pci->ptes);
342 
343 	pchip->wsba[2].csr = 0x80000000 | 1;
344 	pchip->wsm[2].csr  = (0x80000000 - 1) & 0xfff00000;
345 	pchip->tba[2].csr  = 0;
346 
347 	pchip->wsba[3].csr = 0;
348 
349 	/* Enable the Monster Window to make DAC pci64 possible. */
350 	pchip->pctl.csr |= pctl_m_mwin;
351 
352 	tsunami_pci_tbi(hose, 0, -1);
353 }
354 
355 
356 void __iomem *
357 tsunami_ioportmap(unsigned long addr)
358 {
359 	FIXUP_IOADDR_VGA(addr);
360 	return (void __iomem *)(addr + TSUNAMI_IO_BIAS);
361 }
362 
363 void __iomem *
364 tsunami_ioremap(unsigned long addr, unsigned long size)
365 {
366 	FIXUP_MEMADDR_VGA(addr);
367 	return (void __iomem *)(addr + TSUNAMI_MEM_BIAS);
368 }
369 
370 #ifndef CONFIG_ALPHA_GENERIC
371 EXPORT_SYMBOL(tsunami_ioportmap);
372 EXPORT_SYMBOL(tsunami_ioremap);
373 #endif
374 
375 void __init
376 tsunami_init_arch(void)
377 {
378 #ifdef NXM_MACHINE_CHECKS_ON_TSUNAMI
379 	unsigned long tmp;
380 
381 	/* Ho hum.. init_arch is called before init_IRQ, but we need to be
382 	   able to handle machine checks.  So install the handler now.  */
383 	wrent(entInt, 0);
384 
385 	/* NXMs just don't matter to Tsunami--unless they make it
386 	   choke completely. */
387 	tmp = (unsigned long)(TSUNAMI_cchip - 1);
388 	printk("%s: probing bogus address:  0x%016lx\n", __func__, bogus_addr);
389 	printk("\tprobe %s\n",
390 	       tsunami_probe_write((unsigned long *)bogus_addr)
391 	       ? "succeeded" : "failed");
392 #endif /* NXM_MACHINE_CHECKS_ON_TSUNAMI */
393 
394 #if 0
395 	printk("%s: CChip registers:\n", __func__);
396 	printk("%s: CSR_CSC 0x%lx\n", __func__, TSUNAMI_cchip->csc.csr);
397 	printk("%s: CSR_MTR 0x%lx\n", __func__, TSUNAMI_cchip.mtr.csr);
398 	printk("%s: CSR_MISC 0x%lx\n", __func__, TSUNAMI_cchip->misc.csr);
399 	printk("%s: CSR_DIM0 0x%lx\n", __func__, TSUNAMI_cchip->dim0.csr);
400 	printk("%s: CSR_DIM1 0x%lx\n", __func__, TSUNAMI_cchip->dim1.csr);
401 	printk("%s: CSR_DIR0 0x%lx\n", __func__, TSUNAMI_cchip->dir0.csr);
402 	printk("%s: CSR_DIR1 0x%lx\n", __func__, TSUNAMI_cchip->dir1.csr);
403 	printk("%s: CSR_DRIR 0x%lx\n", __func__, TSUNAMI_cchip->drir.csr);
404 
405 	printk("%s: DChip registers:\n");
406 	printk("%s: CSR_DSC 0x%lx\n", __func__, TSUNAMI_dchip->dsc.csr);
407 	printk("%s: CSR_STR 0x%lx\n", __func__, TSUNAMI_dchip->str.csr);
408 	printk("%s: CSR_DREV 0x%lx\n", __func__, TSUNAMI_dchip->drev.csr);
409 #endif
410 	/* With multiple PCI busses, we play with I/O as physical addrs.  */
411 	ioport_resource.end = ~0UL;
412 
413 	/* Find how many hoses we have, and initialize them.  TSUNAMI
414 	   and TYPHOON can have 2, but might only have 1 (DS10).  */
415 
416 	tsunami_init_one_pchip(TSUNAMI_pchip0, 0);
417 	if (TSUNAMI_cchip->csc.csr & 1L<<14)
418 		tsunami_init_one_pchip(TSUNAMI_pchip1, 1);
419 
420 	/* Check for graphic console location (if any).  */
421 	find_console_vga_hose();
422 }
423 
424 static void
425 tsunami_kill_one_pchip(tsunami_pchip *pchip, int index)
426 {
427 	pchip->wsba[0].csr = saved_config[index].wsba[0];
428 	pchip->wsm[0].csr = saved_config[index].wsm[0];
429 	pchip->tba[0].csr = saved_config[index].tba[0];
430 
431 	pchip->wsba[1].csr = saved_config[index].wsba[1];
432 	pchip->wsm[1].csr = saved_config[index].wsm[1];
433 	pchip->tba[1].csr = saved_config[index].tba[1];
434 
435 	pchip->wsba[2].csr = saved_config[index].wsba[2];
436 	pchip->wsm[2].csr = saved_config[index].wsm[2];
437 	pchip->tba[2].csr = saved_config[index].tba[2];
438 
439 	pchip->wsba[3].csr = saved_config[index].wsba[3];
440 	pchip->wsm[3].csr = saved_config[index].wsm[3];
441 	pchip->tba[3].csr = saved_config[index].tba[3];
442 }
443 
444 void
445 tsunami_kill_arch(int mode)
446 {
447 	tsunami_kill_one_pchip(TSUNAMI_pchip0, 0);
448 	if (TSUNAMI_cchip->csc.csr & 1L<<14)
449 		tsunami_kill_one_pchip(TSUNAMI_pchip1, 1);
450 }
451 
452 static inline void
453 tsunami_pci_clr_err_1(tsunami_pchip *pchip)
454 {
455 	pchip->perror.csr;
456 	pchip->perror.csr = 0x040;
457 	mb();
458 	pchip->perror.csr;
459 }
460 
461 static inline void
462 tsunami_pci_clr_err(void)
463 {
464 	tsunami_pci_clr_err_1(TSUNAMI_pchip0);
465 
466 	/* TSUNAMI and TYPHOON can have 2, but might only have 1 (DS10) */
467 	if (TSUNAMI_cchip->csc.csr & 1L<<14)
468 		tsunami_pci_clr_err_1(TSUNAMI_pchip1);
469 }
470 
471 void
472 tsunami_machine_check(unsigned long vector, unsigned long la_ptr)
473 {
474 	/* Clear error before any reporting.  */
475 	mb();
476 	mb();  /* magic */
477 	draina();
478 	tsunami_pci_clr_err();
479 	wrmces(0x7);
480 	mb();
481 
482 	process_mcheck_info(vector, la_ptr, "TSUNAMI",
483 			    mcheck_expected(smp_processor_id()));
484 }
485