xref: /openbmc/linux/arch/alpha/kernel/core_tsunami.c (revision 22246614) 
1 /*
2  *	linux/arch/alpha/kernel/core_tsunami.c
3  *
4  * Based on code written by David A. Rusling (david.rusling@reo.mts.dec.com).
5  *
6  * Code common to all TSUNAMI core logic chips.
7  */
8 
9 #define __EXTERN_INLINE inline
10 #include <asm/io.h>
11 #include <asm/core_tsunami.h>
12 #undef __EXTERN_INLINE
13 
14 #include <linux/types.h>
15 #include <linux/pci.h>
16 #include <linux/sched.h>
17 #include <linux/init.h>
18 #include <linux/bootmem.h>
19 
20 #include <asm/ptrace.h>
21 #include <asm/smp.h>
22 #include <asm/vga.h>
23 
24 #include "proto.h"
25 #include "pci_impl.h"
26 
27 /* Save Tsunami configuration data as the console had it set up.  */
28 
29 struct
30 {
31 	unsigned long wsba[4];
32 	unsigned long wsm[4];
33 	unsigned long tba[4];
34 } saved_config[2] __attribute__((common));
35 
36 /*
37  * NOTE: Herein lie back-to-back mb instructions.  They are magic.
38  * One plausible explanation is that the I/O controller does not properly
39  * handle the system transaction.  Another involves timing.  Ho hum.
40  */
41 
42 /*
43  * BIOS32-style PCI interface:
44  */
45 
46 #define DEBUG_CONFIG 0
47 
48 #if DEBUG_CONFIG
49 # define DBG_CFG(args)	printk args
50 #else
51 # define DBG_CFG(args)
52 #endif
53 
54 
55 /*
56  * Given a bus, device, and function number, compute resulting
57  * configuration space address
58  * accordingly.  It is therefore not safe to have concurrent
59  * invocations to configuration space access routines, but there
60  * really shouldn't be any need for this.
61  *
62  * Note that all config space accesses use Type 1 address format.
63  *
64  * Note also that type 1 is determined by non-zero bus number.
65  *
66  * Type 1:
67  *
68  *  3 3|3 3 2 2|2 2 2 2|2 2 2 2|1 1 1 1|1 1 1 1|1 1
69  *  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
70  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
71  * | | | | | | | | | | |B|B|B|B|B|B|B|B|D|D|D|D|D|F|F|F|R|R|R|R|R|R|0|1|
72  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
73  *
74  *	31:24	reserved
75  *	23:16	bus number (8 bits = 128 possible buses)
76  *	15:11	Device number (5 bits)
77  *	10:8	function number
78  *	 7:2	register number
79  *
80  * Notes:
81  *	The function number selects which function of a multi-function device
82  *	(e.g., SCSI and Ethernet).
83  *
84  *	The register selects a DWORD (32 bit) register offset.  Hence it
85  *	doesn't get shifted by 2 bits as we want to "drop" the bottom two
86  *	bits.
87  */
88 
89 static int
90 mk_conf_addr(struct pci_bus *pbus, unsigned int device_fn, int where,
91 	     unsigned long *pci_addr, unsigned char *type1)
92 {
93 	struct pci_controller *hose = pbus->sysdata;
94 	unsigned long addr;
95 	u8 bus = pbus->number;
96 
97 	DBG_CFG(("mk_conf_addr(bus=%d ,device_fn=0x%x, where=0x%x, "
98 		 "pci_addr=0x%p, type1=0x%p)\n",
99 		 bus, device_fn, where, pci_addr, type1));
100 
101 	if (!pbus->parent) /* No parent means peer PCI bus. */
102 		bus = 0;
103 	*type1 = (bus != 0);
104 
105 	addr = (bus << 16) | (device_fn << 8) | where;
106 	addr |= hose->config_space_base;
107 
108 	*pci_addr = addr;
109 	DBG_CFG(("mk_conf_addr: returning pci_addr 0x%lx\n", addr));
110 	return 0;
111 }
112 
113 static int
114 tsunami_read_config(struct pci_bus *bus, unsigned int devfn, int where,
115 		    int size, u32 *value)
116 {
117 	unsigned long addr;
118 	unsigned char type1;
119 
120 	if (mk_conf_addr(bus, devfn, where, &addr, &type1))
121 		return PCIBIOS_DEVICE_NOT_FOUND;
122 
123 	switch (size) {
124 	case 1:
125 		*value = __kernel_ldbu(*(vucp)addr);
126 		break;
127 	case 2:
128 		*value = __kernel_ldwu(*(vusp)addr);
129 		break;
130 	case 4:
131 		*value = *(vuip)addr;
132 		break;
133 	}
134 
135 	return PCIBIOS_SUCCESSFUL;
136 }
137 
138 static int
139 tsunami_write_config(struct pci_bus *bus, unsigned int devfn, int where,
140 		     int size, u32 value)
141 {
142 	unsigned long addr;
143 	unsigned char type1;
144 
145 	if (mk_conf_addr(bus, devfn, where, &addr, &type1))
146 		return PCIBIOS_DEVICE_NOT_FOUND;
147 
148 	switch (size) {
149 	case 1:
150 		__kernel_stb(value, *(vucp)addr);
151 		mb();
152 		__kernel_ldbu(*(vucp)addr);
153 		break;
154 	case 2:
155 		__kernel_stw(value, *(vusp)addr);
156 		mb();
157 		__kernel_ldwu(*(vusp)addr);
158 		break;
159 	case 4:
160 		*(vuip)addr = value;
161 		mb();
162 		*(vuip)addr;
163 		break;
164 	}
165 
166 	return PCIBIOS_SUCCESSFUL;
167 }
168 
169 struct pci_ops tsunami_pci_ops =
170 {
171 	.read =		tsunami_read_config,
172 	.write = 	tsunami_write_config,
173 };
174 
175 void
176 tsunami_pci_tbi(struct pci_controller *hose, dma_addr_t start, dma_addr_t end)
177 {
178 	tsunami_pchip *pchip = hose->index ? TSUNAMI_pchip1 : TSUNAMI_pchip0;
179 	volatile unsigned long *csr;
180 	unsigned long value;
181 
182 	/* We can invalidate up to 8 tlb entries in a go.  The flush
183 	   matches against <31:16> in the pci address.  */
184 	csr = &pchip->tlbia.csr;
185 	if (((start ^ end) & 0xffff0000) == 0)
186 		csr = &pchip->tlbiv.csr;
187 
188 	/* For TBIA, it doesn't matter what value we write.  For TBI,
189 	   it's the shifted tag bits.  */
190 	value = (start & 0xffff0000) >> 12;
191 
192 	*csr = value;
193 	mb();
194 	*csr;
195 }
196 
197 #ifdef NXM_MACHINE_CHECKS_ON_TSUNAMI
198 static long __init
199 tsunami_probe_read(volatile unsigned long *vaddr)
200 {
201 	long dont_care, probe_result;
202 	int cpu = smp_processor_id();
203 	int s = swpipl(IPL_MCHECK - 1);
204 
205 	mcheck_taken(cpu) = 0;
206 	mcheck_expected(cpu) = 1;
207 	mb();
208 	dont_care = *vaddr;
209 	draina();
210 	mcheck_expected(cpu) = 0;
211 	probe_result = !mcheck_taken(cpu);
212 	mcheck_taken(cpu) = 0;
213 	setipl(s);
214 
215 	printk("dont_care == 0x%lx\n", dont_care);
216 
217 	return probe_result;
218 }
219 
220 static long __init
221 tsunami_probe_write(volatile unsigned long *vaddr)
222 {
223 	long true_contents, probe_result = 1;
224 
225 	TSUNAMI_cchip->misc.csr |= (1L << 28); /* clear NXM... */
226 	true_contents = *vaddr;
227 	*vaddr = 0;
228 	draina();
229 	if (TSUNAMI_cchip->misc.csr & (1L << 28)) {
230 		int source = (TSUNAMI_cchip->misc.csr >> 29) & 7;
231 		TSUNAMI_cchip->misc.csr |= (1L << 28); /* ...and unlock NXS. */
232 		probe_result = 0;
233 		printk("tsunami_probe_write: unit %d at 0x%016lx\n", source,
234 		       (unsigned long)vaddr);
235 	}
236 	if (probe_result)
237 		*vaddr = true_contents;
238 	return probe_result;
239 }
240 #else
241 #define tsunami_probe_read(ADDR) 1
242 #endif /* NXM_MACHINE_CHECKS_ON_TSUNAMI */
243 
244 static void __init
245 tsunami_init_one_pchip(tsunami_pchip *pchip, int index)
246 {
247 	struct pci_controller *hose;
248 
249 	if (tsunami_probe_read(&pchip->pctl.csr) == 0)
250 		return;
251 
252 	hose = alloc_pci_controller();
253 	if (index == 0)
254 		pci_isa_hose = hose;
255 	hose->io_space = alloc_resource();
256 	hose->mem_space = alloc_resource();
257 
258 	/* This is for userland consumption.  For some reason, the 40-bit
259 	   PIO bias that we use in the kernel through KSEG didn't work for
260 	   the page table based user mappings.  So make sure we get the
261 	   43-bit PIO bias.  */
262 	hose->sparse_mem_base = 0;
263 	hose->sparse_io_base = 0;
264 	hose->dense_mem_base
265 	  = (TSUNAMI_MEM(index) & 0xffffffffffL) | 0x80000000000L;
266 	hose->dense_io_base
267 	  = (TSUNAMI_IO(index) & 0xffffffffffL) | 0x80000000000L;
268 
269 	hose->config_space_base = TSUNAMI_CONF(index);
270 	hose->index = index;
271 
272 	hose->io_space->start = TSUNAMI_IO(index) - TSUNAMI_IO_BIAS;
273 	hose->io_space->end = hose->io_space->start + TSUNAMI_IO_SPACE - 1;
274 	hose->io_space->name = pci_io_names[index];
275 	hose->io_space->flags = IORESOURCE_IO;
276 
277 	hose->mem_space->start = TSUNAMI_MEM(index) - TSUNAMI_MEM_BIAS;
278 	hose->mem_space->end = hose->mem_space->start + 0xffffffff;
279 	hose->mem_space->name = pci_mem_names[index];
280 	hose->mem_space->flags = IORESOURCE_MEM;
281 
282 	if (request_resource(&ioport_resource, hose->io_space) < 0)
283 		printk(KERN_ERR "Failed to request IO on hose %d\n", index);
284 	if (request_resource(&iomem_resource, hose->mem_space) < 0)
285 		printk(KERN_ERR "Failed to request MEM on hose %d\n", index);
286 
287 	/*
288 	 * Save the existing PCI window translations.  SRM will
289 	 * need them when we go to reboot.
290 	 */
291 
292 	saved_config[index].wsba[0] = pchip->wsba[0].csr;
293 	saved_config[index].wsm[0] = pchip->wsm[0].csr;
294 	saved_config[index].tba[0] = pchip->tba[0].csr;
295 
296 	saved_config[index].wsba[1] = pchip->wsba[1].csr;
297 	saved_config[index].wsm[1] = pchip->wsm[1].csr;
298 	saved_config[index].tba[1] = pchip->tba[1].csr;
299 
300 	saved_config[index].wsba[2] = pchip->wsba[2].csr;
301 	saved_config[index].wsm[2] = pchip->wsm[2].csr;
302 	saved_config[index].tba[2] = pchip->tba[2].csr;
303 
304 	saved_config[index].wsba[3] = pchip->wsba[3].csr;
305 	saved_config[index].wsm[3] = pchip->wsm[3].csr;
306 	saved_config[index].tba[3] = pchip->tba[3].csr;
307 
308 	/*
309 	 * Set up the PCI to main memory translation windows.
310 	 *
311 	 * Note: Window 3 is scatter-gather only
312 	 *
313 	 * Window 0 is scatter-gather 8MB at 8MB (for isa)
314 	 * Window 1 is scatter-gather (up to) 1GB at 1GB
315 	 * Window 2 is direct access 2GB at 2GB
316 	 *
317 	 * NOTE: we need the align_entry settings for Acer devices on ES40,
318 	 * specifically floppy and IDE when memory is larger than 2GB.
319 	 */
320 	hose->sg_isa = iommu_arena_new(hose, 0x00800000, 0x00800000, 0);
321 	/* Initially set for 4 PTEs, but will be overridden to 64K for ISA. */
322         hose->sg_isa->align_entry = 4;
323 
324 	hose->sg_pci = iommu_arena_new(hose, 0x40000000,
325 				       size_for_memory(0x40000000), 0);
326         hose->sg_pci->align_entry = 4; /* Tsunami caches 4 PTEs at a time */
327 
328 	__direct_map_base = 0x80000000;
329 	__direct_map_size = 0x80000000;
330 
331 	pchip->wsba[0].csr = hose->sg_isa->dma_base | 3;
332 	pchip->wsm[0].csr  = (hose->sg_isa->size - 1) & 0xfff00000;
333 	pchip->tba[0].csr  = virt_to_phys(hose->sg_isa->ptes);
334 
335 	pchip->wsba[1].csr = hose->sg_pci->dma_base | 3;
336 	pchip->wsm[1].csr  = (hose->sg_pci->size - 1) & 0xfff00000;
337 	pchip->tba[1].csr  = virt_to_phys(hose->sg_pci->ptes);
338 
339 	pchip->wsba[2].csr = 0x80000000 | 1;
340 	pchip->wsm[2].csr  = (0x80000000 - 1) & 0xfff00000;
341 	pchip->tba[2].csr  = 0;
342 
343 	pchip->wsba[3].csr = 0;
344 
345 	/* Enable the Monster Window to make DAC pci64 possible. */
346 	pchip->pctl.csr |= pctl_m_mwin;
347 
348 	tsunami_pci_tbi(hose, 0, -1);
349 }
350 
351 
352 void __iomem *
353 tsunami_ioportmap(unsigned long addr)
354 {
355 	FIXUP_IOADDR_VGA(addr);
356 	return (void __iomem *)(addr + TSUNAMI_IO_BIAS);
357 }
358 
359 void __iomem *
360 tsunami_ioremap(unsigned long addr, unsigned long size)
361 {
362 	FIXUP_MEMADDR_VGA(addr);
363 	return (void __iomem *)(addr + TSUNAMI_MEM_BIAS);
364 }
365 
366 #ifndef CONFIG_ALPHA_GENERIC
367 EXPORT_SYMBOL(tsunami_ioportmap);
368 EXPORT_SYMBOL(tsunami_ioremap);
369 #endif
370 
371 void __init
372 tsunami_init_arch(void)
373 {
374 #ifdef NXM_MACHINE_CHECKS_ON_TSUNAMI
375 	unsigned long tmp;
376 
377 	/* Ho hum.. init_arch is called before init_IRQ, but we need to be
378 	   able to handle machine checks.  So install the handler now.  */
379 	wrent(entInt, 0);
380 
381 	/* NXMs just don't matter to Tsunami--unless they make it
382 	   choke completely. */
383 	tmp = (unsigned long)(TSUNAMI_cchip - 1);
384 	printk("%s: probing bogus address:  0x%016lx\n", __func__, bogus_addr);
385 	printk("\tprobe %s\n",
386 	       tsunami_probe_write((unsigned long *)bogus_addr)
387 	       ? "succeeded" : "failed");
388 #endif /* NXM_MACHINE_CHECKS_ON_TSUNAMI */
389 
390 #if 0
391 	printk("%s: CChip registers:\n", __func__);
392 	printk("%s: CSR_CSC 0x%lx\n", __func__, TSUNAMI_cchip->csc.csr);
393 	printk("%s: CSR_MTR 0x%lx\n", __func__, TSUNAMI_cchip.mtr.csr);
394 	printk("%s: CSR_MISC 0x%lx\n", __func__, TSUNAMI_cchip->misc.csr);
395 	printk("%s: CSR_DIM0 0x%lx\n", __func__, TSUNAMI_cchip->dim0.csr);
396 	printk("%s: CSR_DIM1 0x%lx\n", __func__, TSUNAMI_cchip->dim1.csr);
397 	printk("%s: CSR_DIR0 0x%lx\n", __func__, TSUNAMI_cchip->dir0.csr);
398 	printk("%s: CSR_DIR1 0x%lx\n", __func__, TSUNAMI_cchip->dir1.csr);
399 	printk("%s: CSR_DRIR 0x%lx\n", __func__, TSUNAMI_cchip->drir.csr);
400 
401 	printk("%s: DChip registers:\n");
402 	printk("%s: CSR_DSC 0x%lx\n", __func__, TSUNAMI_dchip->dsc.csr);
403 	printk("%s: CSR_STR 0x%lx\n", __func__, TSUNAMI_dchip->str.csr);
404 	printk("%s: CSR_DREV 0x%lx\n", __func__, TSUNAMI_dchip->drev.csr);
405 #endif
406 	/* With multiple PCI busses, we play with I/O as physical addrs.  */
407 	ioport_resource.end = ~0UL;
408 
409 	/* Find how many hoses we have, and initialize them.  TSUNAMI
410 	   and TYPHOON can have 2, but might only have 1 (DS10).  */
411 
412 	tsunami_init_one_pchip(TSUNAMI_pchip0, 0);
413 	if (TSUNAMI_cchip->csc.csr & 1L<<14)
414 		tsunami_init_one_pchip(TSUNAMI_pchip1, 1);
415 
416 	/* Check for graphic console location (if any).  */
417 	find_console_vga_hose();
418 }
419 
420 static void
421 tsunami_kill_one_pchip(tsunami_pchip *pchip, int index)
422 {
423 	pchip->wsba[0].csr = saved_config[index].wsba[0];
424 	pchip->wsm[0].csr = saved_config[index].wsm[0];
425 	pchip->tba[0].csr = saved_config[index].tba[0];
426 
427 	pchip->wsba[1].csr = saved_config[index].wsba[1];
428 	pchip->wsm[1].csr = saved_config[index].wsm[1];
429 	pchip->tba[1].csr = saved_config[index].tba[1];
430 
431 	pchip->wsba[2].csr = saved_config[index].wsba[2];
432 	pchip->wsm[2].csr = saved_config[index].wsm[2];
433 	pchip->tba[2].csr = saved_config[index].tba[2];
434 
435 	pchip->wsba[3].csr = saved_config[index].wsba[3];
436 	pchip->wsm[3].csr = saved_config[index].wsm[3];
437 	pchip->tba[3].csr = saved_config[index].tba[3];
438 }
439 
440 void
441 tsunami_kill_arch(int mode)
442 {
443 	tsunami_kill_one_pchip(TSUNAMI_pchip0, 0);
444 	if (TSUNAMI_cchip->csc.csr & 1L<<14)
445 		tsunami_kill_one_pchip(TSUNAMI_pchip1, 1);
446 }
447 
448 static inline void
449 tsunami_pci_clr_err_1(tsunami_pchip *pchip)
450 {
451 	pchip->perror.csr;
452 	pchip->perror.csr = 0x040;
453 	mb();
454 	pchip->perror.csr;
455 }
456 
457 static inline void
458 tsunami_pci_clr_err(void)
459 {
460 	tsunami_pci_clr_err_1(TSUNAMI_pchip0);
461 
462 	/* TSUNAMI and TYPHOON can have 2, but might only have 1 (DS10) */
463 	if (TSUNAMI_cchip->csc.csr & 1L<<14)
464 		tsunami_pci_clr_err_1(TSUNAMI_pchip1);
465 }
466 
467 void
468 tsunami_machine_check(unsigned long vector, unsigned long la_ptr)
469 {
470 	/* Clear error before any reporting.  */
471 	mb();
472 	mb();  /* magic */
473 	draina();
474 	tsunami_pci_clr_err();
475 	wrmces(0x7);
476 	mb();
477 
478 	process_mcheck_info(vector, la_ptr, "TSUNAMI",
479 			    mcheck_expected(smp_processor_id()));
480 }
481