1 // SPDX-License-Identifier: GPL-2.0
3 * linux/arch/alpha/kernel/sys_sio.c
5 * Copyright (C) 1995 David A Rusling
6 * Copyright (C) 1996 Jay A Estabrook
7 * Copyright (C) 1998, 1999 Richard Henderson
9 * Code for all boards that route the PCI interrupts through the SIO
10 * PCI/ISA bridge. This includes Noname (AXPpci33), Multia (UDB),
11 * Kenetics's Platform 2000, Avanti (AlphaStation), XL, and AlphaBook1.
14 #include <linux/kernel.h>
15 #include <linux/types.h>
17 #include <linux/sched.h>
18 #include <linux/pci.h>
19 #include <linux/init.h>
20 #include <linux/screen_info.h>
22 #include <asm/compiler.h>
23 #include <asm/ptrace.h>
26 #include <asm/mmu_context.h>
28 #include <asm/core_apecs.h>
29 #include <asm/core_lca.h>
30 #include <asm/tlbflush.h>
35 #include "machvec_impl.h"
38 #if defined(ALPHA_RESTORE_SRM_SETUP)
39 /* Save LCA configuration data as the console had it set up. */
42 unsigned int orig_route_tab; /* for SAVE/RESTORE */
43 } saved_config __attribute((common));
51 alpha_mv.device_interrupt = srm_device_interrupt;
54 common_init_isa_dma();
57 static inline void __init
58 alphabook1_init_arch(void)
60 #ifdef CONFIG_VGA_CONSOLE
61 /* The AlphaBook1 has LCD video fixed at 800x600,
62 37 rows and 100 cols. */
63 vgacon_screen_info.orig_y = 37;
64 vgacon_screen_info.orig_video_cols = 100;
65 vgacon_screen_info.orig_video_lines = 37;
73 * sio_route_tab selects irq routing in PCI/ISA bridge so that:
79 * This probably ought to be configurable via MILO. For
80 * example, sound boards seem to like using IRQ 9.
82 * This is NOT how we should do it. PIRQ0-X should have
83 * their own IRQs, the way intel uses the IO-APIC IRQs.
89 unsigned int orig_route_tab;
91 /* First, ALWAYS read and print the original setting. */
92 pci_bus_read_config_dword(pci_isa_hose->bus, PCI_DEVFN(7, 0), 0x60,
94 printk("%s: PIRQ original 0x%x new 0x%x\n", __func__,
95 orig_route_tab, alpha_mv.sys.sio.route_tab);
97 #if defined(ALPHA_RESTORE_SRM_SETUP)
98 saved_config.orig_route_tab = orig_route_tab;
101 /* Now override with desired setting. */
102 pci_bus_write_config_dword(pci_isa_hose->bus, PCI_DEVFN(7, 0), 0x60,
103 alpha_mv.sys.sio.route_tab);
106 static bool sio_pci_dev_irq_needs_level(const struct pci_dev *dev)
108 if ((dev->class >> 16 == PCI_BASE_CLASS_BRIDGE) &&
109 (dev->class >> 8 != PCI_CLASS_BRIDGE_PCMCIA))
115 static unsigned int __init
116 sio_collect_irq_levels(void)
118 unsigned int level_bits = 0;
119 struct pci_dev *dev = NULL;
121 /* Iterate through the devices, collecting IRQ levels. */
122 for_each_pci_dev(dev) {
123 if (!sio_pci_dev_irq_needs_level(dev))
127 level_bits |= (1 << dev->irq);
132 static void __sio_fixup_irq_levels(unsigned int level_bits, bool reset)
134 unsigned int old_level_bits;
137 * Now, make all PCI interrupts level sensitive. Notice:
138 * these registers must be accessed byte-wise. inw()/outw()
141 * Make sure to turn off any level bits set for IRQs 9,10,11,15,
142 * so that the only bits getting set are for devices actually found.
143 * Note that we do preserve the remainder of the bits, which we hope
144 * will be set correctly by ARC/SRM.
146 * Note: we at least preserve any level-set bits on AlphaBook1
148 old_level_bits = inb(0x4d0) | (inb(0x4d1) << 8);
151 old_level_bits &= 0x71ff;
153 level_bits |= old_level_bits;
155 outb((level_bits >> 0) & 0xff, 0x4d0);
156 outb((level_bits >> 8) & 0xff, 0x4d1);
160 sio_fixup_irq_levels(unsigned int level_bits)
162 __sio_fixup_irq_levels(level_bits, true);
166 noname_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
169 * The Noname board has 5 PCI slots with each of the 4
170 * interrupt pins routed to different pins on the PCI/ISA
171 * bridge (PIRQ0-PIRQ3). The table below is based on
172 * information available at:
174 * http://ftp.digital.com/pub/DEC/axppci/ref_interrupts.txt
176 * I have no information on the Avanti interrupt routing, but
177 * the routing seems to be identical to the Noname except
178 * that the Avanti has an additional slot whose routing I'm
181 * pirq_tab[0] is a fake entry to deal with old PCI boards
182 * that have the interrupt pin number hardwired to 0 (meaning
183 * that they use the default INTA line, if they are interrupt
186 static char irq_tab[][5] = {
188 { 3, 3, 3, 3, 3}, /* idsel 6 (53c810) */
189 {-1, -1, -1, -1, -1}, /* idsel 7 (SIO: PCI/ISA bridge) */
190 { 2, 2, -1, -1, -1}, /* idsel 8 (Hack: slot closest ISA) */
191 {-1, -1, -1, -1, -1}, /* idsel 9 (unused) */
192 {-1, -1, -1, -1, -1}, /* idsel 10 (unused) */
193 { 0, 0, 2, 1, 0}, /* idsel 11 KN25_PCI_SLOT0 */
194 { 1, 1, 0, 2, 1}, /* idsel 12 KN25_PCI_SLOT1 */
195 { 2, 2, 1, 0, 2}, /* idsel 13 KN25_PCI_SLOT2 */
196 { 0, 0, 0, 0, 0}, /* idsel 14 AS255 TULIP */
198 const long min_idsel = 6, max_idsel = 14, irqs_per_slot = 5;
199 int irq = COMMON_TABLE_LOOKUP, tmp;
200 tmp = __kernel_extbl(alpha_mv.sys.sio.route_tab, irq);
202 irq = irq >= 0 ? tmp : -1;
204 /* Fixup IRQ level if an actual IRQ mapping is detected */
205 if (sio_pci_dev_irq_needs_level(dev) && irq >= 0)
206 __sio_fixup_irq_levels(1 << irq, false);
212 p2k_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
214 static char irq_tab[][5] = {
216 { 0, 0, -1, -1, -1}, /* idsel 6 (53c810) */
217 {-1, -1, -1, -1, -1}, /* idsel 7 (SIO: PCI/ISA bridge) */
218 { 1, 1, 2, 3, 0}, /* idsel 8 (slot A) */
219 { 2, 2, 3, 0, 1}, /* idsel 9 (slot B) */
220 {-1, -1, -1, -1, -1}, /* idsel 10 (unused) */
221 {-1, -1, -1, -1, -1}, /* idsel 11 (unused) */
222 { 3, 3, -1, -1, -1}, /* idsel 12 (CMD0646) */
224 const long min_idsel = 6, max_idsel = 12, irqs_per_slot = 5;
225 int irq = COMMON_TABLE_LOOKUP, tmp;
226 tmp = __kernel_extbl(alpha_mv.sys.sio.route_tab, irq);
227 return irq >= 0 ? tmp : -1;
230 static inline void __init
231 noname_init_pci(void)
235 sio_fixup_irq_levels(sio_collect_irq_levels());
237 if (pc873xx_probe() == -1) {
238 printk(KERN_ERR "Probing for PC873xx Super IO chip failed.\n");
240 printk(KERN_INFO "Found %s Super IO chip at 0x%x\n",
241 pc873xx_get_model(), pc873xx_get_base());
243 /* Enabling things in the Super IO chip doesn't actually
244 * configure and enable things, the legacy drivers still
245 * need to do the actual configuration and enabling.
246 * This only unblocks them.
249 #if !defined(CONFIG_ALPHA_AVANTI)
250 /* Don't bother on the Avanti family.
251 * None of them had on-board IDE.
253 pc873xx_enable_ide();
255 pc873xx_enable_epp19();
259 static inline void __init
260 alphabook1_init_pci(void)
263 unsigned char orig, config;
269 * On the AlphaBook1, the PCMCIA chip (Cirrus 6729)
270 * is sensitive to PCI bus bursts, so we must DISABLE
271 * burst mode for the NCR 8xx SCSI... :-(
273 * Note that the NCR810 SCSI driver must preserve the
274 * setting of the bit in order for this to work. At the
275 * moment (2.0.29), ncr53c8xx.c does NOT do this, but
280 while ((dev = pci_get_device(PCI_VENDOR_ID_NCR, PCI_ANY_ID, dev))) {
281 if (dev->device == PCI_DEVICE_ID_NCR_53C810
282 || dev->device == PCI_DEVICE_ID_NCR_53C815
283 || dev->device == PCI_DEVICE_ID_NCR_53C820
284 || dev->device == PCI_DEVICE_ID_NCR_53C825) {
285 unsigned long io_port;
286 unsigned char ctest4;
288 io_port = dev->resource[0].start;
289 ctest4 = inb(io_port+0x21);
290 if (!(ctest4 & 0x80)) {
291 printk("AlphaBook1 NCR init: setting"
293 outb(ctest4 | 0x80, io_port+0x21);
298 /* Do not set *ANY* level triggers for AlphaBook1. */
299 sio_fixup_irq_levels(0);
301 /* Make sure that register PR1 indicates 1Mb mem */
302 outb(0x0f, 0x3ce); orig = inb(0x3cf); /* read PR5 */
303 outb(0x0f, 0x3ce); outb(0x05, 0x3cf); /* unlock PR0-4 */
304 outb(0x0b, 0x3ce); config = inb(0x3cf); /* read PR1 */
305 if ((config & 0xc0) != 0xc0) {
306 printk("AlphaBook1 VGA init: setting 1Mb memory\n");
308 outb(0x0b, 0x3ce); outb(config, 0x3cf); /* write PR1 */
310 outb(0x0f, 0x3ce); outb(orig, 0x3cf); /* (re)lock PR0-4 */
314 sio_kill_arch(int mode)
316 #if defined(ALPHA_RESTORE_SRM_SETUP)
317 /* Since we cannot read the PCI DMA Window CSRs, we
318 * cannot restore them here.
320 * However, we CAN read the PIRQ route register, so restore it
323 pci_bus_write_config_dword(pci_isa_hose->bus, PCI_DEVFN(7, 0), 0x60,
324 saved_config.orig_route_tab);
333 #if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_BOOK1)
334 struct alpha_machine_vector alphabook1_mv __initmv = {
335 .vector_name = "AlphaBook1",
339 .machine_check = lca_machine_check,
340 .max_isa_dma_address = ALPHA_MAX_ISA_DMA_ADDRESS,
341 .min_io_address = DEFAULT_IO_BASE,
342 .min_mem_address = APECS_AND_LCA_DEFAULT_MEM_BASE,
345 .device_interrupt = isa_device_interrupt,
347 .init_arch = alphabook1_init_arch,
348 .init_irq = sio_init_irq,
349 .init_rtc = common_init_rtc,
350 .init_pci = alphabook1_init_pci,
351 .kill_arch = sio_kill_arch,
352 .pci_map_irq = noname_map_irq,
353 .pci_swizzle = common_swizzle,
356 /* NCR810 SCSI is 14, PCMCIA controller is 15. */
357 .route_tab = 0x0e0f0a0a,
363 #if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_AVANTI)
364 struct alpha_machine_vector avanti_mv __initmv = {
365 .vector_name = "Avanti",
369 .machine_check = apecs_machine_check,
370 .max_isa_dma_address = ALPHA_MAX_ISA_DMA_ADDRESS,
371 .min_io_address = DEFAULT_IO_BASE,
372 .min_mem_address = APECS_AND_LCA_DEFAULT_MEM_BASE,
375 .device_interrupt = isa_device_interrupt,
377 .init_arch = apecs_init_arch,
378 .init_irq = sio_init_irq,
379 .init_rtc = common_init_rtc,
380 .init_pci = noname_init_pci,
381 .kill_arch = sio_kill_arch,
382 .pci_map_irq = noname_map_irq,
383 .pci_swizzle = common_swizzle,
386 .route_tab = 0x0b0a050f, /* leave 14 for IDE, 9 for SND */
392 #if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_NONAME)
393 struct alpha_machine_vector noname_mv __initmv = {
394 .vector_name = "Noname",
398 .machine_check = lca_machine_check,
399 .max_isa_dma_address = ALPHA_MAX_ISA_DMA_ADDRESS,
400 .min_io_address = DEFAULT_IO_BASE,
401 .min_mem_address = APECS_AND_LCA_DEFAULT_MEM_BASE,
404 .device_interrupt = srm_device_interrupt,
406 .init_arch = lca_init_arch,
407 .init_irq = sio_init_irq,
408 .init_rtc = common_init_rtc,
409 .init_pci = noname_init_pci,
410 .kill_arch = sio_kill_arch,
411 .pci_map_irq = noname_map_irq,
412 .pci_swizzle = common_swizzle,
415 /* For UDB, the only available PCI slot must not map to IRQ 9,
416 since that's the builtin MSS sound chip. That PCI slot
417 will map to PIRQ1 (for INTA at least), so we give it IRQ 15
420 Unfortunately we have to do this for NONAME as well, since
421 they are co-indicated when the platform type "Noname" is
424 .route_tab = 0x0b0a0f0d,
430 #if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_P2K)
431 struct alpha_machine_vector p2k_mv __initmv = {
432 .vector_name = "Platform2000",
436 .machine_check = lca_machine_check,
437 .max_isa_dma_address = ALPHA_MAX_ISA_DMA_ADDRESS,
438 .min_io_address = DEFAULT_IO_BASE,
439 .min_mem_address = APECS_AND_LCA_DEFAULT_MEM_BASE,
442 .device_interrupt = srm_device_interrupt,
444 .init_arch = lca_init_arch,
445 .init_irq = sio_init_irq,
446 .init_rtc = common_init_rtc,
447 .init_pci = noname_init_pci,
448 .kill_arch = sio_kill_arch,
449 .pci_map_irq = p2k_map_irq,
450 .pci_swizzle = common_swizzle,
453 .route_tab = 0x0b0a090f,
459 #if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_XL)
460 struct alpha_machine_vector xl_mv __initmv = {
465 .machine_check = apecs_machine_check,
466 .max_isa_dma_address = ALPHA_XL_MAX_ISA_DMA_ADDRESS,
467 .min_io_address = DEFAULT_IO_BASE,
468 .min_mem_address = XL_DEFAULT_MEM_BASE,
471 .device_interrupt = isa_device_interrupt,
473 .init_arch = apecs_init_arch,
474 .init_irq = sio_init_irq,
475 .init_rtc = common_init_rtc,
476 .init_pci = noname_init_pci,
477 .kill_arch = sio_kill_arch,
478 .pci_map_irq = noname_map_irq,
479 .pci_swizzle = common_swizzle,
482 .route_tab = 0x0b0a090f,