2 * linux/arch/alpha/kernel/core_t2.c
4 * Written by Jay A Estabrook (jestabro@amt.tay1.dec.com).
7 * based on CIA code by David A Rusling (david.rusling@reo.mts.dec.com)
9 * Code common to all T2 core logic chips.
12 #define __EXTERN_INLINE
14 #include <asm/core_t2.h>
15 #undef __EXTERN_INLINE
17 #include <linux/types.h>
18 #include <linux/pci.h>
19 #include <linux/sched.h>
20 #include <linux/init.h>
22 #include <asm/ptrace.h>
23 #include <asm/delay.h>
28 /* For dumping initial DMA window settings. */
29 #define DEBUG_PRINT_INITIAL_SETTINGS 0
31 /* For dumping final DMA window settings. */
32 #define DEBUG_PRINT_FINAL_SETTINGS 0
35 * By default, we direct-map starting at 2GB, in order to allow the
36 * maximum size direct-map window (2GB) to match the maximum amount of
37 * memory (2GB) that can be present on SABLEs. But that limits the
38 * floppy to DMA only via the scatter/gather window set up for 8MB
39 * ISA DMA, since the maximum ISA DMA address is 2GB-1.
41 * For now, this seems a reasonable trade-off: even though most SABLEs
42 * have less than 1GB of memory, floppy usage/performance will not
43 * really be affected by forcing it to go via scatter/gather...
45 #define T2_DIRECTMAP_2G 1
48 # define T2_DIRECTMAP_START 0x80000000UL
49 # define T2_DIRECTMAP_LENGTH 0x80000000UL
51 # define T2_DIRECTMAP_START 0x40000000UL
52 # define T2_DIRECTMAP_LENGTH 0x40000000UL
55 /* The ISA scatter/gather window settings. */
56 #define T2_ISA_SG_START 0x00800000UL
57 #define T2_ISA_SG_LENGTH 0x00800000UL
60 * NOTE: Herein lie back-to-back mb instructions. They are magic.
61 * One plausible explanation is that the i/o controller does not properly
62 * handle the system transaction. Another involves timing. Ho hum.
66 * BIOS32-style PCI interface:
69 #define DEBUG_CONFIG 0
72 # define DBG(args) printk args
77 static volatile unsigned int t2_mcheck_any_expected;
78 static volatile unsigned int t2_mcheck_last_taken;
80 /* Place to save the DMA Window registers as set up by SRM
81 for restoration during shutdown. */
94 } t2_saved_config __attribute((common));
97 * Given a bus, device, and function number, compute resulting
98 * configuration space address and setup the T2_HAXR2 register
99 * accordingly. It is therefore not safe to have concurrent
100 * invocations to configuration space access routines, but there
101 * really shouldn't be any need for this.
105 * 3 3|3 3 2 2|2 2 2 2|2 2 2 2|1 1 1 1|1 1 1 1|1 1
106 * 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
107 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
108 * | | |D|D|D|D|D|D|D|D|D|D|D|D|D|D|D|D|D|D|D|D|D|F|F|F|R|R|R|R|R|R|0|0|
109 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
111 * 31:11 Device select bit.
112 * 10:8 Function number
113 * 7:2 Register number
117 * 3 3|3 3 2 2|2 2 2 2|2 2 2 2|1 1 1 1|1 1 1 1|1 1
118 * 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
119 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
120 * | | | | | | | | | | |B|B|B|B|B|B|B|B|D|D|D|D|D|F|F|F|R|R|R|R|R|R|0|1|
121 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
124 * 23:16 bus number (8 bits = 128 possible buses)
125 * 15:11 Device number (5 bits)
126 * 10:8 function number
127 * 7:2 register number
130 * The function number selects which function of a multi-function device
131 * (e.g., SCSI and Ethernet).
133 * The register selects a DWORD (32 bit) register offset. Hence it
134 * doesn't get shifted by 2 bits as we want to "drop" the bottom two
139 mk_conf_addr(struct pci_bus *pbus, unsigned int device_fn, int where,
140 unsigned long *pci_addr, unsigned char *type1)
143 u8 bus = pbus->number;
145 DBG(("mk_conf_addr(bus=%d, dfn=0x%x, where=0x%x,"
146 " addr=0x%lx, type1=0x%x)\n",
147 bus, device_fn, where, pci_addr, type1));
150 int device = device_fn >> 3;
152 /* Type 0 configuration cycle. */
155 DBG(("mk_conf_addr: device (%d)>20, returning -1\n",
161 addr = (0x0800L << device) | ((device_fn & 7) << 8) | (where);
163 /* Type 1 configuration cycle. */
165 addr = (bus << 16) | (device_fn << 8) | (where);
168 DBG(("mk_conf_addr: returning pci_addr 0x%lx\n", addr));
173 * NOTE: both conf_read() and conf_write() may set HAE_3 when needing
174 * to do type1 access. This is protected by the use of spinlock IRQ
175 * primitives in the wrapper functions pci_{read,write}_config_*()
176 * defined in drivers/pci/pci.c.
179 conf_read(unsigned long addr, unsigned char type1)
181 unsigned int value, cpu, taken;
182 unsigned long t2_cfg = 0;
184 cpu = smp_processor_id();
186 DBG(("conf_read(addr=0x%lx, type1=%d)\n", addr, type1));
188 /* If Type1 access, must set T2 CFG. */
190 t2_cfg = *(vulp)T2_HAE_3 & ~0xc0000000UL;
191 *(vulp)T2_HAE_3 = 0x40000000UL | t2_cfg;
197 mcheck_expected(cpu) = 1;
198 mcheck_taken(cpu) = 0;
199 t2_mcheck_any_expected |= (1 << cpu);
202 /* Access configuration space. */
207 /* Wait for possible mcheck. Also, this lets other CPUs clear
208 their mchecks as well, as they can reliably tell when
209 another CPU is in the midst of handling a real mcheck via
210 the "taken" function. */
213 if ((taken = mcheck_taken(cpu))) {
214 mcheck_taken(cpu) = 0;
215 t2_mcheck_last_taken |= (1 << cpu);
219 mcheck_expected(cpu) = 0;
220 t2_mcheck_any_expected = 0;
223 /* If Type1 access, must reset T2 CFG so normal IO space ops work. */
225 *(vulp)T2_HAE_3 = t2_cfg;
233 conf_write(unsigned long addr, unsigned int value, unsigned char type1)
235 unsigned int cpu, taken;
236 unsigned long t2_cfg = 0;
238 cpu = smp_processor_id();
240 /* If Type1 access, must set T2 CFG. */
242 t2_cfg = *(vulp)T2_HAE_3 & ~0xc0000000UL;
243 *(vulp)T2_HAE_3 = t2_cfg | 0x40000000UL;
249 mcheck_expected(cpu) = 1;
250 mcheck_taken(cpu) = 0;
251 t2_mcheck_any_expected |= (1 << cpu);
254 /* Access configuration space. */
259 /* Wait for possible mcheck. Also, this lets other CPUs clear
260 their mchecks as well, as they can reliably tell when
261 this CPU is in the midst of handling a real mcheck via
262 the "taken" function. */
265 if ((taken = mcheck_taken(cpu))) {
266 mcheck_taken(cpu) = 0;
267 t2_mcheck_last_taken |= (1 << cpu);
270 mcheck_expected(cpu) = 0;
271 t2_mcheck_any_expected = 0;
274 /* If Type1 access, must reset T2 CFG so normal IO space ops work. */
276 *(vulp)T2_HAE_3 = t2_cfg;
282 t2_read_config(struct pci_bus *bus, unsigned int devfn, int where,
283 int size, u32 *value)
285 unsigned long addr, pci_addr;
290 if (mk_conf_addr(bus, devfn, where, &pci_addr, &type1))
291 return PCIBIOS_DEVICE_NOT_FOUND;
293 mask = (size - 1) * 8;
294 shift = (where & 3) * 8;
295 addr = (pci_addr << 5) + mask + T2_CONF;
296 *value = conf_read(addr, type1) >> (shift);
297 return PCIBIOS_SUCCESSFUL;
301 t2_write_config(struct pci_bus *bus, unsigned int devfn, int where, int size,
304 unsigned long addr, pci_addr;
308 if (mk_conf_addr(bus, devfn, where, &pci_addr, &type1))
309 return PCIBIOS_DEVICE_NOT_FOUND;
311 mask = (size - 1) * 8;
312 addr = (pci_addr << 5) + mask + T2_CONF;
313 conf_write(addr, value << ((where & 3) * 8), type1);
314 return PCIBIOS_SUCCESSFUL;
317 struct pci_ops t2_pci_ops =
319 .read = t2_read_config,
320 .write = t2_write_config,
324 t2_direct_map_window1(unsigned long base, unsigned long length)
328 __direct_map_base = base;
329 __direct_map_size = length;
331 temp = (base & 0xfff00000UL) | ((base + length - 1) >> 20);
332 *(vulp)T2_WBASE1 = temp | 0x80000UL; /* OR in ENABLE bit */
333 temp = (length - 1) & 0xfff00000UL;
334 *(vulp)T2_WMASK1 = temp;
335 *(vulp)T2_TBASE1 = 0;
337 #if DEBUG_PRINT_FINAL_SETTINGS
338 printk("%s: setting WBASE1=0x%lx WMASK1=0x%lx TBASE1=0x%lx\n",
347 t2_sg_map_window2(struct pci_controller *hose,
349 unsigned long length)
353 /* Note we can only do 1 SG window, as the other is for direct, so
354 do an ISA SG area, especially for the floppy. */
355 hose->sg_isa = iommu_arena_new(hose, base, length, 0);
358 temp = (base & 0xfff00000UL) | ((base + length - 1) >> 20);
359 *(vulp)T2_WBASE2 = temp | 0xc0000UL; /* OR in ENABLE/SG bits */
360 temp = (length - 1) & 0xfff00000UL;
361 *(vulp)T2_WMASK2 = temp;
362 *(vulp)T2_TBASE2 = virt_to_phys(hose->sg_isa->ptes) >> 1;
365 t2_pci_tbi(hose, 0, -1); /* flush TLB all */
367 #if DEBUG_PRINT_FINAL_SETTINGS
368 printk("%s: setting WBASE2=0x%lx WMASK2=0x%lx TBASE2=0x%lx\n",
377 t2_save_configuration(void)
379 #if DEBUG_PRINT_INITIAL_SETTINGS
380 printk("%s: HAE_1 was 0x%lx\n", __FUNCTION__, srm_hae); /* HW is 0 */
381 printk("%s: HAE_2 was 0x%lx\n", __FUNCTION__, *(vulp)T2_HAE_2);
382 printk("%s: HAE_3 was 0x%lx\n", __FUNCTION__, *(vulp)T2_HAE_3);
383 printk("%s: HAE_4 was 0x%lx\n", __FUNCTION__, *(vulp)T2_HAE_4);
384 printk("%s: HBASE was 0x%lx\n", __FUNCTION__, *(vulp)T2_HBASE);
386 printk("%s: WBASE1=0x%lx WMASK1=0x%lx TBASE1=0x%lx\n", __FUNCTION__,
387 *(vulp)T2_WBASE1, *(vulp)T2_WMASK1, *(vulp)T2_TBASE1);
388 printk("%s: WBASE2=0x%lx WMASK2=0x%lx TBASE2=0x%lx\n", __FUNCTION__,
389 *(vulp)T2_WBASE2, *(vulp)T2_WMASK2, *(vulp)T2_TBASE2);
393 * Save the DMA Window registers.
395 t2_saved_config.window[0].wbase = *(vulp)T2_WBASE1;
396 t2_saved_config.window[0].wmask = *(vulp)T2_WMASK1;
397 t2_saved_config.window[0].tbase = *(vulp)T2_TBASE1;
398 t2_saved_config.window[1].wbase = *(vulp)T2_WBASE2;
399 t2_saved_config.window[1].wmask = *(vulp)T2_WMASK2;
400 t2_saved_config.window[1].tbase = *(vulp)T2_TBASE2;
402 t2_saved_config.hae_1 = srm_hae; /* HW is already set to 0 */
403 t2_saved_config.hae_2 = *(vulp)T2_HAE_2;
404 t2_saved_config.hae_3 = *(vulp)T2_HAE_3;
405 t2_saved_config.hae_4 = *(vulp)T2_HAE_4;
406 t2_saved_config.hbase = *(vulp)T2_HBASE;
412 struct pci_controller *hose;
416 for (i = 0; i < NR_CPUS; i++) {
417 mcheck_expected(i) = 0;
420 t2_mcheck_any_expected = 0;
421 t2_mcheck_last_taken = 0;
423 /* Enable scatter/gather TLB use. */
424 temp = *(vulp)T2_IOCSR;
425 if (!(temp & (0x1UL << 26))) {
426 printk("t2_init_arch: enabling SG TLB, IOCSR was 0x%lx\n",
428 *(vulp)T2_IOCSR = temp | (0x1UL << 26);
430 *(vulp)T2_IOCSR; /* read it back to make sure */
433 t2_save_configuration();
436 * Create our single hose.
438 pci_isa_hose = hose = alloc_pci_controller();
439 hose->io_space = &ioport_resource;
440 hose->mem_space = &iomem_resource;
443 hose->sparse_mem_base = T2_SPARSE_MEM - IDENT_ADDR;
444 hose->dense_mem_base = T2_DENSE_MEM - IDENT_ADDR;
445 hose->sparse_io_base = T2_IO - IDENT_ADDR;
446 hose->dense_io_base = 0;
449 * Set up the PCI->physical memory translation windows.
451 * Window 1 is direct mapped.
452 * Window 2 is scatter/gather (for ISA).
455 t2_direct_map_window1(T2_DIRECTMAP_START, T2_DIRECTMAP_LENGTH);
457 /* Always make an ISA DMA window. */
458 t2_sg_map_window2(hose, T2_ISA_SG_START, T2_ISA_SG_LENGTH);
460 *(vulp)T2_HBASE = 0x0; /* Disable HOLES. */
463 *(vulp)T2_HAE_1 = 0; mb(); /* Sparse MEM HAE */
464 *(vulp)T2_HAE_2 = 0; mb(); /* Sparse I/O HAE */
465 *(vulp)T2_HAE_3 = 0; mb(); /* Config Space HAE */
468 * We also now zero out HAE_4, the dense memory HAE, so that
469 * we need not account for its "offset" when accessing dense
470 * memory resources which we allocated in our normal way. This
471 * HAE would need to stay untouched were we to keep the SRM
474 * Thus we can now run standard X servers on SABLE/LYNX. :-)
476 *(vulp)T2_HAE_4 = 0; mb();
480 t2_kill_arch(int mode)
483 * Restore the DMA Window registers.
485 *(vulp)T2_WBASE1 = t2_saved_config.window[0].wbase;
486 *(vulp)T2_WMASK1 = t2_saved_config.window[0].wmask;
487 *(vulp)T2_TBASE1 = t2_saved_config.window[0].tbase;
488 *(vulp)T2_WBASE2 = t2_saved_config.window[1].wbase;
489 *(vulp)T2_WMASK2 = t2_saved_config.window[1].wmask;
490 *(vulp)T2_TBASE2 = t2_saved_config.window[1].tbase;
493 *(vulp)T2_HAE_1 = srm_hae;
494 *(vulp)T2_HAE_2 = t2_saved_config.hae_2;
495 *(vulp)T2_HAE_3 = t2_saved_config.hae_3;
496 *(vulp)T2_HAE_4 = t2_saved_config.hae_4;
497 *(vulp)T2_HBASE = t2_saved_config.hbase;
499 *(vulp)T2_HBASE; /* READ it back to ensure WRITE occurred. */
503 t2_pci_tbi(struct pci_controller *hose, dma_addr_t start, dma_addr_t end)
505 unsigned long t2_iocsr;
507 t2_iocsr = *(vulp)T2_IOCSR;
509 /* set the TLB Clear bit */
510 *(vulp)T2_IOCSR = t2_iocsr | (0x1UL << 28);
512 *(vulp)T2_IOCSR; /* read it back to make sure */
514 /* clear the TLB Clear bit */
515 *(vulp)T2_IOCSR = t2_iocsr & ~(0x1UL << 28);
517 *(vulp)T2_IOCSR; /* read it back to make sure */
520 #define SIC_SEIC (1UL << 33) /* System Event Clear */
523 t2_clear_errors(int cpu)
525 struct sable_cpu_csr *cpu_regs;
527 cpu_regs = (struct sable_cpu_csr *)T2_CPUn_BASE(cpu);
529 cpu_regs->sic &= ~SIC_SEIC;
531 /* Clear CPU errors. */
532 cpu_regs->bcce |= cpu_regs->bcce;
533 cpu_regs->cbe |= cpu_regs->cbe;
534 cpu_regs->bcue |= cpu_regs->bcue;
535 cpu_regs->dter |= cpu_regs->dter;
537 *(vulp)T2_CERR1 |= *(vulp)T2_CERR1;
538 *(vulp)T2_PERR1 |= *(vulp)T2_PERR1;
545 * SABLE seems to have a "broadcast" style machine check, in that all
546 * CPUs receive it. And, the issuing CPU, in the case of PCI Config
547 * space read/write faults, will also receive a second mcheck, upon
548 * lowering IPL during completion processing in pci_read_config_byte()
551 * Hence all the taken/expected/any_expected/last_taken stuff...
554 t2_machine_check(unsigned long vector, unsigned long la_ptr)
556 int cpu = smp_processor_id();
557 #ifdef CONFIG_VERBOSE_MCHECK
558 struct el_common *mchk_header = (struct el_common *)la_ptr;
561 /* Clear the error before any reporting. */
565 t2_clear_errors(cpu);
567 /* This should not actually be done until the logout frame is
568 examined, but, since we don't do that, go on and do this... */
572 /* Now, do testing for the anomalous conditions. */
573 if (!mcheck_expected(cpu) && t2_mcheck_any_expected) {
575 * FUNKY: Received mcheck on a CPU and not
576 * expecting it, but another CPU is expecting one.
578 * Just dismiss it for now on this CPU...
580 #ifdef CONFIG_VERBOSE_MCHECK
581 if (alpha_verbose_mcheck > 1) {
582 printk("t2_machine_check(cpu%d): any_expected 0x%x -"
583 " (assumed) spurious -"
584 " code 0x%x\n", cpu, t2_mcheck_any_expected,
585 (unsigned int)mchk_header->code);
591 if (!mcheck_expected(cpu) && !t2_mcheck_any_expected) {
592 if (t2_mcheck_last_taken & (1 << cpu)) {
593 #ifdef CONFIG_VERBOSE_MCHECK
594 if (alpha_verbose_mcheck > 1) {
595 printk("t2_machine_check(cpu%d): last_taken 0x%x - "
596 "unexpected mcheck - code 0x%x\n",
597 cpu, t2_mcheck_last_taken,
598 (unsigned int)mchk_header->code);
601 t2_mcheck_last_taken = 0;
605 t2_mcheck_last_taken = 0;
610 #ifdef CONFIG_VERBOSE_MCHECK
611 if (alpha_verbose_mcheck > 1) {
612 printk("%s t2_mcheck(cpu%d): last_taken 0x%x - "
613 "any_expected 0x%x - code 0x%x\n",
614 (mcheck_expected(cpu) ? "EX" : "UN"), cpu,
615 t2_mcheck_last_taken, t2_mcheck_any_expected,
616 (unsigned int)mchk_header->code);
620 process_mcheck_info(vector, la_ptr, "T2", mcheck_expected(cpu));