xref: /openbmc/linux/arch/alpha/kernel/core_tsunami.c (revision 9f380456) 
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/module.h>
15 #include <linux/types.h>
16 #include <linux/pci.h>
17 #include <linux/sched.h>
18 #include <linux/init.h>
19 #include <linux/bootmem.h>
20 
21 #include <asm/ptrace.h>
22 #include <asm/smp.h>
23 #include <asm/vga.h>
24 
25 #include "proto.h"
26 #include "pci_impl.h"
27 
28 /* Save Tsunami configuration data as the console had it set up.  */
29 
30 struct
31 {
32 	unsigned long wsba[4];
33 	unsigned long wsm[4];
34 	unsigned long tba[4];
35 } saved_config[2] __attribute__((common));
36 
37 /*
38  * NOTE: Herein lie back-to-back mb instructions.  They are magic.
39  * One plausible explanation is that the I/O controller does not properly
40  * handle the system transaction.  Another involves timing.  Ho hum.
41  */
42 
43 /*
44  * BIOS32-style PCI interface:
45  */
46 
47 #define DEBUG_CONFIG 0
48 
49 #if DEBUG_CONFIG
50 # define DBG_CFG(args)	printk args
51 #else
52 # define DBG_CFG(args)
53 #endif
54 
55 
56 /*
57  * Given a bus, device, and function number, compute resulting
58  * configuration space address
59  * accordingly.  It is therefore not safe to have concurrent
60  * invocations to configuration space access routines, but there
61  * really shouldn't be any need for this.
62  *
63  * Note that all config space accesses use Type 1 address format.
64  *
65  * Note also that type 1 is determined by non-zero bus number.
66  *
67  * Type 1:
68  *
69  *  3 3|3 3 2 2|2 2 2 2|2 2 2 2|1 1 1 1|1 1 1 1|1 1
70  *  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
71  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
72  * | | | | | | | | | | |B|B|B|B|B|B|B|B|D|D|D|D|D|F|F|F|R|R|R|R|R|R|0|1|
73  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
74  *
75  *	31:24	reserved
76  *	23:16	bus number (8 bits = 128 possible buses)
77  *	15:11	Device number (5 bits)
78  *	10:8	function number
79  *	 7:2	register number
80  *
81  * Notes:
82  *	The function number selects which function of a multi-function device
83  *	(e.g., SCSI and Ethernet).
84  *
85  *	The register selects a DWORD (32 bit) register offset.  Hence it
86  *	doesn't get shifted by 2 bits as we want to "drop" the bottom two
87  *	bits.
88  */
89 
90 static int
91 mk_conf_addr(struct pci_bus *pbus, unsigned int device_fn, int where,
92 	     unsigned long *pci_addr, unsigned char *type1)
93 {
94 	struct pci_controller *hose = pbus->sysdata;
95 	unsigned long addr;
96 	u8 bus = pbus->number;
97 
98 	DBG_CFG(("mk_conf_addr(bus=%d ,device_fn=0x%x, where=0x%x, "
99 		 "pci_addr=0x%p, type1=0x%p)\n",
100 		 bus, device_fn, where, pci_addr, type1));
101 
102 	if (!pbus->parent) /* No parent means peer PCI bus. */
103 		bus = 0;
104 	*type1 = (bus != 0);
105 
106 	addr = (bus << 16) | (device_fn << 8) | where;
107 	addr |= hose->config_space_base;
108 
109 	*pci_addr = addr;
110 	DBG_CFG(("mk_conf_addr: returning pci_addr 0x%lx\n", addr));
111 	return 0;
112 }
113 
114 static int
115 tsunami_read_config(struct pci_bus *bus, unsigned int devfn, int where,
116 		    int size, u32 *value)
117 {
118 	unsigned long addr;
119 	unsigned char type1;
120 
121 	if (mk_conf_addr(bus, devfn, where, &addr, &type1))
122 		return PCIBIOS_DEVICE_NOT_FOUND;
123 
124 	switch (size) {
125 	case 1:
126 		*value = __kernel_ldbu(*(vucp)addr);
127 		break;
128 	case 2:
129 		*value = __kernel_ldwu(*(vusp)addr);
130 		break;
131 	case 4:
132 		*value = *(vuip)addr;
133 		break;
134 	}
135 
136 	return PCIBIOS_SUCCESSFUL;
137 }
138 
139 static int
140 tsunami_write_config(struct pci_bus *bus, unsigned int devfn, int where,
141 		     int size, u32 value)
142 {
143 	unsigned long addr;
144 	unsigned char type1;
145 
146 	if (mk_conf_addr(bus, devfn, where, &addr, &type1))
147 		return PCIBIOS_DEVICE_NOT_FOUND;
148 
149 	switch (size) {
150 	case 1:
151 		__kernel_stb(value, *(vucp)addr);
152 		mb();
153 		__kernel_ldbu(*(vucp)addr);
154 		break;
155 	case 2:
156 		__kernel_stw(value, *(vusp)addr);
157 		mb();
158 		__kernel_ldwu(*(vusp)addr);
159 		break;
160 	case 4:
161 		*(vuip)addr = value;
162 		mb();
163 		*(vuip)addr;
164 		break;
165 	}
166 
167 	return PCIBIOS_SUCCESSFUL;
168 }
169 
170 struct pci_ops tsunami_pci_ops =
171 {
172 	.read =		tsunami_read_config,
173 	.write = 	tsunami_write_config,
174 };
175 
176 void
177 tsunami_pci_tbi(struct pci_controller *hose, dma_addr_t start, dma_addr_t end)
178 {
179 	tsunami_pchip *pchip = hose->index ? TSUNAMI_pchip1 : TSUNAMI_pchip0;
180 	volatile unsigned long *csr;
181 	unsigned long value;
182 
183 	/* We can invalidate up to 8 tlb entries in a go.  The flush
184 	   matches against <31:16> in the pci address.  */
185 	csr = &pchip->tlbia.csr;
186 	if (((start ^ end) & 0xffff0000) == 0)
187 		csr = &pchip->tlbiv.csr;
188 
189 	/* For TBIA, it doesn't matter what value we write.  For TBI,
190 	   it's the shifted tag bits.  */
191 	value = (start & 0xffff0000) >> 12;
192 
193 	*csr = value;
194 	mb();
195 	*csr;
196 }
197 
198 #ifdef NXM_MACHINE_CHECKS_ON_TSUNAMI
199 static long __init
200 tsunami_probe_read(volatile unsigned long *vaddr)
201 {
202 	long dont_care, probe_result;
203 	int cpu = smp_processor_id();
204 	int s = swpipl(IPL_MCHECK - 1);
205 
206 	mcheck_taken(cpu) = 0;
207 	mcheck_expected(cpu) = 1;
208 	mb();
209 	dont_care = *vaddr;
210 	draina();
211 	mcheck_expected(cpu) = 0;
212 	probe_result = !mcheck_taken(cpu);
213 	mcheck_taken(cpu) = 0;
214 	setipl(s);
215 
216 	printk("dont_care == 0x%lx\n", dont_care);
217 
218 	return probe_result;
219 }
220 
221 static long __init
222 tsunami_probe_write(volatile unsigned long *vaddr)
223 {
224 	long true_contents, probe_result = 1;
225 
226 	TSUNAMI_cchip->misc.csr |= (1L << 28); /* clear NXM... */
227 	true_contents = *vaddr;
228 	*vaddr = 0;
229 	draina();
230 	if (TSUNAMI_cchip->misc.csr & (1L << 28)) {
231 		int source = (TSUNAMI_cchip->misc.csr >> 29) & 7;
232 		TSUNAMI_cchip->misc.csr |= (1L << 28); /* ...and unlock NXS. */
233 		probe_result = 0;
234 		printk("tsunami_probe_write: unit %d at 0x%016lx\n", source,
235 		       (unsigned long)vaddr);
236 	}
237 	if (probe_result)
238 		*vaddr = true_contents;
239 	return probe_result;
240 }
241 #else
242 #define tsunami_probe_read(ADDR) 1
243 #endif /* NXM_MACHINE_CHECKS_ON_TSUNAMI */
244 
245 static void __init
246 tsunami_init_one_pchip(tsunami_pchip *pchip, int index)
247 {
248 	struct pci_controller *hose;
249 
250 	if (tsunami_probe_read(&pchip->pctl.csr) == 0)
251 		return;
252 
253 	hose = alloc_pci_controller();
254 	if (index == 0)
255 		pci_isa_hose = hose;
256 	hose->io_space = alloc_resource();
257 	hose->mem_space = alloc_resource();
258 
259 	/* This is for userland consumption.  For some reason, the 40-bit
260 	   PIO bias that we use in the kernel through KSEG didn't work for
261 	   the page table based user mappings.  So make sure we get the
262 	   43-bit PIO bias.  */
263 	hose->sparse_mem_base = 0;
264 	hose->sparse_io_base = 0;
265 	hose->dense_mem_base
266 	  = (TSUNAMI_MEM(index) & 0xffffffffffL) | 0x80000000000L;
267 	hose->dense_io_base
268 	  = (TSUNAMI_IO(index) & 0xffffffffffL) | 0x80000000000L;
269 
270 	hose->config_space_base = TSUNAMI_CONF(index);
271 	hose->index = index;
272 
273 	hose->io_space->start = TSUNAMI_IO(index) - TSUNAMI_IO_BIAS;
274 	hose->io_space->end = hose->io_space->start + TSUNAMI_IO_SPACE - 1;
275 	hose->io_space->name = pci_io_names[index];
276 	hose->io_space->flags = IORESOURCE_IO;
277 
278 	hose->mem_space->start = TSUNAMI_MEM(index) - TSUNAMI_MEM_BIAS;
279 	hose->mem_space->end = hose->mem_space->start + 0xffffffff;
280 	hose->mem_space->name = pci_mem_names[index];
281 	hose->mem_space->flags = IORESOURCE_MEM;
282 
283 	if (request_resource(&ioport_resource, hose->io_space) < 0)
284 		printk(KERN_ERR "Failed to request IO on hose %d\n", index);
285 	if (request_resource(&iomem_resource, hose->mem_space) < 0)
286 		printk(KERN_ERR "Failed to request MEM on hose %d\n", index);
287 
288 	/*
289 	 * Save the existing PCI window translations.  SRM will
290 	 * need them when we go to reboot.
291 	 */
292 
293 	saved_config[index].wsba[0] = pchip->wsba[0].csr;
294 	saved_config[index].wsm[0] = pchip->wsm[0].csr;
295 	saved_config[index].tba[0] = pchip->tba[0].csr;
296 
297 	saved_config[index].wsba[1] = pchip->wsba[1].csr;
298 	saved_config[index].wsm[1] = pchip->wsm[1].csr;
299 	saved_config[index].tba[1] = pchip->tba[1].csr;
300 
301 	saved_config[index].wsba[2] = pchip->wsba[2].csr;
302 	saved_config[index].wsm[2] = pchip->wsm[2].csr;
303 	saved_config[index].tba[2] = pchip->tba[2].csr;
304 
305 	saved_config[index].wsba[3] = pchip->wsba[3].csr;
306 	saved_config[index].wsm[3] = pchip->wsm[3].csr;
307 	saved_config[index].tba[3] = pchip->tba[3].csr;
308 
309 	/*
310 	 * Set up the PCI to main memory translation windows.
311 	 *
312 	 * Note: Window 3 is scatter-gather only
313 	 *
314 	 * Window 0 is scatter-gather 8MB at 8MB (for isa)
315 	 * Window 1 is scatter-gather (up to) 1GB at 1GB
316 	 * Window 2 is direct access 2GB at 2GB
317 	 *
318 	 * NOTE: we need the align_entry settings for Acer devices on ES40,
319 	 * specifically floppy and IDE when memory is larger than 2GB.
320 	 */
321 	hose->sg_isa = iommu_arena_new(hose, 0x00800000, 0x00800000, 0);
322 	/* Initially set for 4 PTEs, but will be overridden to 64K for ISA. */
323         hose->sg_isa->align_entry = 4;
324 
325 	hose->sg_pci = iommu_arena_new(hose, 0x40000000,
326 				       size_for_memory(0x40000000), 0);
327         hose->sg_pci->align_entry = 4; /* Tsunami caches 4 PTEs at a time */
328 
329 	__direct_map_base = 0x80000000;
330 	__direct_map_size = 0x80000000;
331 
332 	pchip->wsba[0].csr = hose->sg_isa->dma_base | 3;
333 	pchip->wsm[0].csr  = (hose->sg_isa->size - 1) & 0xfff00000;
334 	pchip->tba[0].csr  = virt_to_phys(hose->sg_isa->ptes);
335 
336 	pchip->wsba[1].csr = hose->sg_pci->dma_base | 3;
337 	pchip->wsm[1].csr  = (hose->sg_pci->size - 1) & 0xfff00000;
338 	pchip->tba[1].csr  = virt_to_phys(hose->sg_pci->ptes);
339 
340 	pchip->wsba[2].csr = 0x80000000 | 1;
341 	pchip->wsm[2].csr  = (0x80000000 - 1) & 0xfff00000;
342 	pchip->tba[2].csr  = 0;
343 
344 	pchip->wsba[3].csr = 0;
345 
346 	/* Enable the Monster Window to make DAC pci64 possible. */
347 	pchip->pctl.csr |= pctl_m_mwin;
348 
349 	tsunami_pci_tbi(hose, 0, -1);
350 }
351 
352 
353 void __iomem *
354 tsunami_ioportmap(unsigned long addr)
355 {
356 	FIXUP_IOADDR_VGA(addr);
357 	return (void __iomem *)(addr + TSUNAMI_IO_BIAS);
358 }
359 
360 void __iomem *
361 tsunami_ioremap(unsigned long addr, unsigned long size)
362 {
363 	FIXUP_MEMADDR_VGA(addr);
364 	return (void __iomem *)(addr + TSUNAMI_MEM_BIAS);
365 }
366 
367 #ifndef CONFIG_ALPHA_GENERIC
368 EXPORT_SYMBOL(tsunami_ioportmap);
369 EXPORT_SYMBOL(tsunami_ioremap);
370 #endif
371 
372 void __init
373 tsunami_init_arch(void)
374 {
375 #ifdef NXM_MACHINE_CHECKS_ON_TSUNAMI
376 	unsigned long tmp;
377 
378 	/* Ho hum.. init_arch is called before init_IRQ, but we need to be
379 	   able to handle machine checks.  So install the handler now.  */
380 	wrent(entInt, 0);
381 
382 	/* NXMs just don't matter to Tsunami--unless they make it
383 	   choke completely. */
384 	tmp = (unsigned long)(TSUNAMI_cchip - 1);
385 	printk("%s: probing bogus address:  0x%016lx\n", __func__, bogus_addr);
386 	printk("\tprobe %s\n",
387 	       tsunami_probe_write((unsigned long *)bogus_addr)
388 	       ? "succeeded" : "failed");
389 #endif /* NXM_MACHINE_CHECKS_ON_TSUNAMI */
390 
391 #if 0
392 	printk("%s: CChip registers:\n", __func__);
393 	printk("%s: CSR_CSC 0x%lx\n", __func__, TSUNAMI_cchip->csc.csr);
394 	printk("%s: CSR_MTR 0x%lx\n", __func__, TSUNAMI_cchip.mtr.csr);
395 	printk("%s: CSR_MISC 0x%lx\n", __func__, TSUNAMI_cchip->misc.csr);
396 	printk("%s: CSR_DIM0 0x%lx\n", __func__, TSUNAMI_cchip->dim0.csr);
397 	printk("%s: CSR_DIM1 0x%lx\n", __func__, TSUNAMI_cchip->dim1.csr);
398 	printk("%s: CSR_DIR0 0x%lx\n", __func__, TSUNAMI_cchip->dir0.csr);
399 	printk("%s: CSR_DIR1 0x%lx\n", __func__, TSUNAMI_cchip->dir1.csr);
400 	printk("%s: CSR_DRIR 0x%lx\n", __func__, TSUNAMI_cchip->drir.csr);
401 
402 	printk("%s: DChip registers:\n");
403 	printk("%s: CSR_DSC 0x%lx\n", __func__, TSUNAMI_dchip->dsc.csr);
404 	printk("%s: CSR_STR 0x%lx\n", __func__, TSUNAMI_dchip->str.csr);
405 	printk("%s: CSR_DREV 0x%lx\n", __func__, TSUNAMI_dchip->drev.csr);
406 #endif
407 	/* With multiple PCI busses, we play with I/O as physical addrs.  */
408 	ioport_resource.end = ~0UL;
409 
410 	/* Find how many hoses we have, and initialize them.  TSUNAMI
411 	   and TYPHOON can have 2, but might only have 1 (DS10).  */
412 
413 	tsunami_init_one_pchip(TSUNAMI_pchip0, 0);
414 	if (TSUNAMI_cchip->csc.csr & 1L<<14)
415 		tsunami_init_one_pchip(TSUNAMI_pchip1, 1);
416 
417 	/* Check for graphic console location (if any).  */
418 	find_console_vga_hose();
419 }
420 
421 static void
422 tsunami_kill_one_pchip(tsunami_pchip *pchip, int index)
423 {
424 	pchip->wsba[0].csr = saved_config[index].wsba[0];
425 	pchip->wsm[0].csr = saved_config[index].wsm[0];
426 	pchip->tba[0].csr = saved_config[index].tba[0];
427 
428 	pchip->wsba[1].csr = saved_config[index].wsba[1];
429 	pchip->wsm[1].csr = saved_config[index].wsm[1];
430 	pchip->tba[1].csr = saved_config[index].tba[1];
431 
432 	pchip->wsba[2].csr = saved_config[index].wsba[2];
433 	pchip->wsm[2].csr = saved_config[index].wsm[2];
434 	pchip->tba[2].csr = saved_config[index].tba[2];
435 
436 	pchip->wsba[3].csr = saved_config[index].wsba[3];
437 	pchip->wsm[3].csr = saved_config[index].wsm[3];
438 	pchip->tba[3].csr = saved_config[index].tba[3];
439 }
440 
441 void
442 tsunami_kill_arch(int mode)
443 {
444 	tsunami_kill_one_pchip(TSUNAMI_pchip0, 0);
445 	if (TSUNAMI_cchip->csc.csr & 1L<<14)
446 		tsunami_kill_one_pchip(TSUNAMI_pchip1, 1);
447 }
448 
449 static inline void
450 tsunami_pci_clr_err_1(tsunami_pchip *pchip)
451 {
452 	pchip->perror.csr;
453 	pchip->perror.csr = 0x040;
454 	mb();
455 	pchip->perror.csr;
456 }
457 
458 static inline void
459 tsunami_pci_clr_err(void)
460 {
461 	tsunami_pci_clr_err_1(TSUNAMI_pchip0);
462 
463 	/* TSUNAMI and TYPHOON can have 2, but might only have 1 (DS10) */
464 	if (TSUNAMI_cchip->csc.csr & 1L<<14)
465 		tsunami_pci_clr_err_1(TSUNAMI_pchip1);
466 }
467 
468 void
469 tsunami_machine_check(unsigned long vector, unsigned long la_ptr)
470 {
471 	/* Clear error before any reporting.  */
472 	mb();
473 	mb();  /* magic */
474 	draina();
475 	tsunami_pci_clr_err();
476 	wrmces(0x7);
477 	mb();
478 
479 	process_mcheck_info(vector, la_ptr, "TSUNAMI",
480 			    mcheck_expected(smp_processor_id()));
481 }
482