Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * 6522 Versatile Interface Adapter (VIA) |
| 3 | * |
Simon Arlott | 0c79cf6 | 2007-10-20 01:20:32 +0200 | [diff] [blame] | 4 | * There are two of these on the Mac II. Some IRQs are vectored |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5 | * via them as are assorted bits and bobs - eg RTC, ADB. |
| 6 | * |
| 7 | * CSA: Motorola seems to have removed documentation on the 6522 from |
| 8 | * their web site; try |
| 9 | * http://nerini.drf.com/vectrex/other/text/chips/6522/ |
| 10 | * http://www.zymurgy.net/classic/vic20/vicdet1.htm |
| 11 | * and |
| 12 | * http://193.23.168.87/mikro_laborversuche/via_iobaustein/via6522_1.html |
| 13 | * for info. A full-text web search on 6522 AND VIA will probably also |
| 14 | * net some usefulness. <cananian@alumni.princeton.edu> 20apr1999 |
| 15 | * |
Finn Thain | 67dfb15 | 2007-05-01 22:32:56 +0200 | [diff] [blame] | 16 | * Additional data is here (the SY6522 was used in the Mac II etc): |
| 17 | * http://www.6502.org/documents/datasheets/synertek/synertek_sy6522.pdf |
| 18 | * http://www.6502.org/documents/datasheets/synertek/synertek_sy6522_programming_reference.pdf |
| 19 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | * PRAM/RTC access algorithms are from the NetBSD RTC toolkit version 1.08b |
| 21 | * by Erik Vogan and adapted to Linux by Joshua M. Thompson (funaho@jurai.org) |
| 22 | * |
| 23 | */ |
| 24 | |
| 25 | #include <linux/types.h> |
| 26 | #include <linux/kernel.h> |
| 27 | #include <linux/mm.h> |
| 28 | #include <linux/delay.h> |
| 29 | #include <linux/init.h> |
| 30 | #include <linux/ide.h> |
Adrian Bunk | deea777 | 2008-02-04 22:30:24 -0800 | [diff] [blame] | 31 | #include <linux/module.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | #include <asm/bootinfo.h> |
| 34 | #include <asm/macintosh.h> |
| 35 | #include <asm/macints.h> |
| 36 | #include <asm/machw.h> |
| 37 | #include <asm/mac_via.h> |
| 38 | #include <asm/mac_psc.h> |
| 39 | |
| 40 | volatile __u8 *via1, *via2; |
| 41 | #if 0 |
| 42 | /* See note in mac_via.h about how this is possibly not useful */ |
| 43 | volatile long *via_memory_bogon=(long *)&via_memory_bogon; |
| 44 | #endif |
Adrian Bunk | deea777 | 2008-02-04 22:30:24 -0800 | [diff] [blame] | 45 | int rbv_present; |
| 46 | int via_alt_mapping; |
| 47 | EXPORT_SYMBOL(via_alt_mapping); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | __u8 rbv_clear; |
| 49 | |
| 50 | /* |
| 51 | * Globals for accessing the VIA chip registers without having to |
| 52 | * check if we're hitting a real VIA or an RBV. Normally you could |
| 53 | * just hit the combined register (ie, vIER|rIER) but that seems to |
| 54 | * break on AV Macs...probably because they actually decode more than |
| 55 | * eight address bits. Why can't Apple engineers at least be |
| 56 | * _consistently_ lazy? - 1999-05-21 (jmt) |
| 57 | */ |
| 58 | |
| 59 | static int gIER,gIFR,gBufA,gBufB; |
| 60 | |
| 61 | /* |
| 62 | * Timer defs. |
| 63 | */ |
| 64 | |
| 65 | #define TICK_SIZE 10000 |
| 66 | #define MAC_CLOCK_TICK (783300/HZ) /* ticks per HZ */ |
| 67 | #define MAC_CLOCK_LOW (MAC_CLOCK_TICK&0xFF) |
| 68 | #define MAC_CLOCK_HIGH (MAC_CLOCK_TICK>>8) |
| 69 | |
Finn Thain | cd713dd | 2007-05-01 22:32:57 +0200 | [diff] [blame] | 70 | /* To disable a NuBus slot on Quadras we make the slot IRQ lines outputs, set |
| 71 | * high. On RBV we just use the slot interrupt enable register. On Macs with |
| 72 | * genuine VIA chips we must use nubus_disabled to keep track of disabled slot |
| 73 | * interrupts. When any slot IRQ is disabled we mask the (edge triggered) CA1 |
| 74 | * or "SLOTS" interrupt. When no slot is disabled, we unmask the CA1 interrupt. |
| 75 | * So, on genuine VIAs, having more than one NuBus IRQ can mean trouble, |
| 76 | * because closing one of those drivers can mask all of the NuBus interrupts. |
| 77 | * Also, since we can't mask the unregistered slot IRQs on genuine VIAs, it's |
| 78 | * possible to get interrupts from cards that MacOS or the ROM has configured |
| 79 | * but we have not. FWIW, "Designing Cards and Drivers for Macintosh II and |
| 80 | * Macintosh SE", page 9-8, says, a slot IRQ with no driver would crash MacOS. |
| 81 | */ |
| 82 | static u8 nubus_disabled; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | |
| 84 | void via_debug_dump(void); |
Al Viro | 2850bc2 | 2006-10-07 14:16:45 +0100 | [diff] [blame] | 85 | irqreturn_t via1_irq(int, void *); |
| 86 | irqreturn_t via2_irq(int, void *); |
| 87 | irqreturn_t via_nubus_irq(int, void *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | void via_irq_enable(int irq); |
| 89 | void via_irq_disable(int irq); |
| 90 | void via_irq_clear(int irq); |
| 91 | |
Al Viro | 2850bc2 | 2006-10-07 14:16:45 +0100 | [diff] [blame] | 92 | extern irqreturn_t mac_scc_dispatch(int, void *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | extern int oss_present; |
| 94 | |
| 95 | /* |
| 96 | * Initialize the VIAs |
| 97 | * |
| 98 | * First we figure out where they actually _are_ as well as what type of |
| 99 | * VIA we have for VIA2 (it could be a real VIA or an RBV or even an OSS.) |
| 100 | * Then we pretty much clear them out and disable all IRQ sources. |
| 101 | * |
| 102 | * Note: the OSS is actually "detected" here and not in oss_init(). It just |
| 103 | * seems more logical to do it here since via_init() needs to know |
| 104 | * these things anyways. |
| 105 | */ |
| 106 | |
| 107 | void __init via_init(void) |
| 108 | { |
| 109 | switch(macintosh_config->via_type) { |
| 110 | |
| 111 | /* IIci, IIsi, IIvx, IIvi (P6xx), LC series */ |
| 112 | |
| 113 | case MAC_VIA_IIci: |
| 114 | via1 = (void *) VIA1_BASE; |
| 115 | if (macintosh_config->ident == MAC_MODEL_IIFX) { |
| 116 | via2 = NULL; |
| 117 | rbv_present = 0; |
| 118 | oss_present = 1; |
| 119 | } else { |
| 120 | via2 = (void *) RBV_BASE; |
| 121 | rbv_present = 1; |
| 122 | oss_present = 0; |
| 123 | } |
| 124 | if (macintosh_config->ident == MAC_MODEL_LCIII) { |
| 125 | rbv_clear = 0x00; |
| 126 | } else { |
| 127 | /* on most RBVs (& unlike the VIAs), you */ |
| 128 | /* need to set bit 7 when you write to IFR */ |
| 129 | /* in order for your clear to occur. */ |
| 130 | rbv_clear = 0x80; |
| 131 | } |
| 132 | gIER = rIER; |
| 133 | gIFR = rIFR; |
| 134 | gBufA = rSIFR; |
| 135 | gBufB = rBufB; |
| 136 | break; |
| 137 | |
| 138 | /* Quadra and early MacIIs agree on the VIA locations */ |
| 139 | |
| 140 | case MAC_VIA_QUADRA: |
| 141 | case MAC_VIA_II: |
| 142 | via1 = (void *) VIA1_BASE; |
| 143 | via2 = (void *) VIA2_BASE; |
| 144 | rbv_present = 0; |
| 145 | oss_present = 0; |
| 146 | rbv_clear = 0x00; |
| 147 | gIER = vIER; |
| 148 | gIFR = vIFR; |
| 149 | gBufA = vBufA; |
| 150 | gBufB = vBufB; |
| 151 | break; |
| 152 | default: |
| 153 | panic("UNKNOWN VIA TYPE"); |
| 154 | } |
| 155 | |
| 156 | printk(KERN_INFO "VIA1 at %p is a 6522 or clone\n", via1); |
| 157 | |
| 158 | printk(KERN_INFO "VIA2 at %p is ", via2); |
| 159 | if (rbv_present) { |
Finn Thain | 67dfb15 | 2007-05-01 22:32:56 +0200 | [diff] [blame] | 160 | printk("an RBV\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 161 | } else if (oss_present) { |
Finn Thain | 67dfb15 | 2007-05-01 22:32:56 +0200 | [diff] [blame] | 162 | printk("an OSS\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 163 | } else { |
Finn Thain | 67dfb15 | 2007-05-01 22:32:56 +0200 | [diff] [blame] | 164 | printk("a 6522 or clone\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 165 | } |
| 166 | |
| 167 | #ifdef DEBUG_VIA |
| 168 | via_debug_dump(); |
| 169 | #endif |
| 170 | |
| 171 | /* |
| 172 | * Shut down all IRQ sources, reset the timers, and |
| 173 | * kill the timer latch on VIA1. |
| 174 | */ |
| 175 | |
| 176 | via1[vIER] = 0x7F; |
| 177 | via1[vIFR] = 0x7F; |
| 178 | via1[vT1LL] = 0; |
| 179 | via1[vT1LH] = 0; |
| 180 | via1[vT1CL] = 0; |
| 181 | via1[vT1CH] = 0; |
| 182 | via1[vT2CL] = 0; |
| 183 | via1[vT2CH] = 0; |
| 184 | via1[vACR] &= 0x3F; |
Finn Thain | 67dfb15 | 2007-05-01 22:32:56 +0200 | [diff] [blame] | 185 | via1[vACR] &= ~0x03; /* disable port A & B latches */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 186 | |
| 187 | /* |
| 188 | * SE/30: disable video IRQ |
| 189 | * XXX: testing for SE/30 VBL |
| 190 | */ |
| 191 | |
| 192 | if (macintosh_config->ident == MAC_MODEL_SE30) { |
| 193 | via1[vDirB] |= 0x40; |
| 194 | via1[vBufB] |= 0x40; |
| 195 | } |
| 196 | |
| 197 | /* |
| 198 | * Set the RTC bits to a known state: all lines to outputs and |
| 199 | * RTC disabled (yes that's 0 to enable and 1 to disable). |
| 200 | */ |
| 201 | |
| 202 | via1[vDirB] |= (VIA1B_vRTCEnb | VIA1B_vRTCClk | VIA1B_vRTCData); |
| 203 | via1[vBufB] |= (VIA1B_vRTCEnb | VIA1B_vRTCClk); |
| 204 | |
| 205 | /* Everything below this point is VIA2/RBV only... */ |
| 206 | |
| 207 | if (oss_present) return; |
| 208 | |
| 209 | #if 1 |
| 210 | /* Some machines support an alternate IRQ mapping that spreads */ |
| 211 | /* Ethernet and Sound out to their own autolevel IRQs and moves */ |
| 212 | /* VIA1 to level 6. A/UX uses this mapping and we do too. Note */ |
| 213 | /* that the IIfx emulates this alternate mapping using the OSS. */ |
| 214 | |
| 215 | switch(macintosh_config->ident) { |
Finn Thain | e10e5c4 | 2007-05-01 22:32:52 +0200 | [diff] [blame] | 216 | case MAC_MODEL_P475: |
| 217 | case MAC_MODEL_P475F: |
| 218 | case MAC_MODEL_P575: |
| 219 | case MAC_MODEL_Q605: |
| 220 | case MAC_MODEL_Q605_ACC: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 221 | case MAC_MODEL_C610: |
| 222 | case MAC_MODEL_Q610: |
Finn Thain | e10e5c4 | 2007-05-01 22:32:52 +0200 | [diff] [blame] | 223 | case MAC_MODEL_Q630: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 224 | case MAC_MODEL_C650: |
| 225 | case MAC_MODEL_Q650: |
| 226 | case MAC_MODEL_Q700: |
| 227 | case MAC_MODEL_Q800: |
| 228 | case MAC_MODEL_Q900: |
| 229 | case MAC_MODEL_Q950: |
| 230 | via_alt_mapping = 1; |
| 231 | via1[vDirB] |= 0x40; |
| 232 | via1[vBufB] &= ~0x40; |
| 233 | break; |
| 234 | default: |
| 235 | via_alt_mapping = 0; |
| 236 | break; |
| 237 | } |
| 238 | #else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 239 | via_alt_mapping = 0; |
| 240 | #endif |
| 241 | |
| 242 | /* |
| 243 | * Now initialize VIA2. For RBV we just kill all interrupts; |
| 244 | * for a regular VIA we also reset the timers and stuff. |
| 245 | */ |
| 246 | |
| 247 | via2[gIER] = 0x7F; |
| 248 | via2[gIFR] = 0x7F | rbv_clear; |
| 249 | if (!rbv_present) { |
| 250 | via2[vT1LL] = 0; |
| 251 | via2[vT1LH] = 0; |
| 252 | via2[vT1CL] = 0; |
| 253 | via2[vT1CH] = 0; |
| 254 | via2[vT2CL] = 0; |
| 255 | via2[vT2CH] = 0; |
| 256 | via2[vACR] &= 0x3F; |
Finn Thain | 67dfb15 | 2007-05-01 22:32:56 +0200 | [diff] [blame] | 257 | via2[vACR] &= ~0x03; /* disable port A & B latches */ |
| 258 | } |
| 259 | |
| 260 | /* |
| 261 | * Set vPCR for SCSI interrupts (but not on RBV) |
| 262 | */ |
| 263 | if (!rbv_present) { |
| 264 | if (macintosh_config->scsi_type == MAC_SCSI_OLD) { |
| 265 | /* CB2 (IRQ) indep. input, positive edge */ |
| 266 | /* CA2 (DRQ) indep. input, positive edge */ |
| 267 | via2[vPCR] = 0x66; |
| 268 | } else { |
| 269 | /* CB2 (IRQ) indep. input, negative edge */ |
| 270 | /* CA2 (DRQ) indep. input, negative edge */ |
| 271 | via2[vPCR] = 0x22; |
| 272 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 273 | } |
| 274 | } |
| 275 | |
| 276 | /* |
| 277 | * Start the 100 Hz clock |
| 278 | */ |
| 279 | |
David Howells | 40220c1 | 2006-10-09 12:19:47 +0100 | [diff] [blame] | 280 | void __init via_init_clock(irq_handler_t func) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 281 | { |
| 282 | via1[vACR] |= 0x40; |
| 283 | via1[vT1LL] = MAC_CLOCK_LOW; |
| 284 | via1[vT1LH] = MAC_CLOCK_HIGH; |
| 285 | via1[vT1CL] = MAC_CLOCK_LOW; |
| 286 | via1[vT1CH] = MAC_CLOCK_HIGH; |
| 287 | |
| 288 | request_irq(IRQ_MAC_TIMER_1, func, IRQ_FLG_LOCK, "timer", func); |
| 289 | } |
| 290 | |
| 291 | /* |
| 292 | * Register the interrupt dispatchers for VIA or RBV machines only. |
| 293 | */ |
| 294 | |
| 295 | void __init via_register_interrupts(void) |
| 296 | { |
| 297 | if (via_alt_mapping) { |
Roman Zippel | 9c5f4af | 2006-06-25 05:47:04 -0700 | [diff] [blame] | 298 | request_irq(IRQ_AUTO_1, via1_irq, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 299 | IRQ_FLG_LOCK|IRQ_FLG_FAST, "software", |
| 300 | (void *) via1); |
Roman Zippel | 9c5f4af | 2006-06-25 05:47:04 -0700 | [diff] [blame] | 301 | request_irq(IRQ_AUTO_6, via1_irq, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 302 | IRQ_FLG_LOCK|IRQ_FLG_FAST, "via1", |
| 303 | (void *) via1); |
| 304 | } else { |
Roman Zippel | 9c5f4af | 2006-06-25 05:47:04 -0700 | [diff] [blame] | 305 | request_irq(IRQ_AUTO_1, via1_irq, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 306 | IRQ_FLG_LOCK|IRQ_FLG_FAST, "via1", |
| 307 | (void *) via1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 308 | } |
Roman Zippel | 9c5f4af | 2006-06-25 05:47:04 -0700 | [diff] [blame] | 309 | request_irq(IRQ_AUTO_2, via2_irq, IRQ_FLG_LOCK|IRQ_FLG_FAST, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 310 | "via2", (void *) via2); |
| 311 | if (!psc_present) { |
Roman Zippel | 9c5f4af | 2006-06-25 05:47:04 -0700 | [diff] [blame] | 312 | request_irq(IRQ_AUTO_4, mac_scc_dispatch, IRQ_FLG_LOCK, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 313 | "scc", mac_scc_dispatch); |
| 314 | } |
| 315 | request_irq(IRQ_MAC_NUBUS, via_nubus_irq, IRQ_FLG_LOCK|IRQ_FLG_FAST, |
| 316 | "nubus", (void *) via2); |
| 317 | } |
| 318 | |
| 319 | /* |
| 320 | * Debugging dump, used in various places to see what's going on. |
| 321 | */ |
| 322 | |
| 323 | void via_debug_dump(void) |
| 324 | { |
| 325 | printk(KERN_DEBUG "VIA1: DDRA = 0x%02X DDRB = 0x%02X ACR = 0x%02X\n", |
| 326 | (uint) via1[vDirA], (uint) via1[vDirB], (uint) via1[vACR]); |
| 327 | printk(KERN_DEBUG " PCR = 0x%02X IFR = 0x%02X IER = 0x%02X\n", |
| 328 | (uint) via1[vPCR], (uint) via1[vIFR], (uint) via1[vIER]); |
| 329 | if (oss_present) { |
| 330 | printk(KERN_DEBUG "VIA2: <OSS>\n"); |
| 331 | } else if (rbv_present) { |
| 332 | printk(KERN_DEBUG "VIA2: IFR = 0x%02X IER = 0x%02X\n", |
| 333 | (uint) via2[rIFR], (uint) via2[rIER]); |
| 334 | printk(KERN_DEBUG " SIFR = 0x%02X SIER = 0x%02X\n", |
| 335 | (uint) via2[rSIFR], (uint) via2[rSIER]); |
| 336 | } else { |
| 337 | printk(KERN_DEBUG "VIA2: DDRA = 0x%02X DDRB = 0x%02X ACR = 0x%02X\n", |
| 338 | (uint) via2[vDirA], (uint) via2[vDirB], |
| 339 | (uint) via2[vACR]); |
| 340 | printk(KERN_DEBUG " PCR = 0x%02X IFR = 0x%02X IER = 0x%02X\n", |
| 341 | (uint) via2[vPCR], |
| 342 | (uint) via2[vIFR], (uint) via2[vIER]); |
| 343 | } |
| 344 | } |
| 345 | |
| 346 | /* |
| 347 | * This is always executed with interrupts disabled. |
| 348 | * |
| 349 | * TBI: get time offset between scheduling timer ticks |
| 350 | */ |
| 351 | |
| 352 | unsigned long mac_gettimeoffset (void) |
| 353 | { |
| 354 | unsigned long ticks, offset = 0; |
| 355 | |
| 356 | /* read VIA1 timer 2 current value */ |
| 357 | ticks = via1[vT1CL] | (via1[vT1CH] << 8); |
| 358 | /* The probability of underflow is less than 2% */ |
| 359 | if (ticks > MAC_CLOCK_TICK - MAC_CLOCK_TICK / 50) |
| 360 | /* Check for pending timer interrupt in VIA1 IFR */ |
| 361 | if (via1[vIFR] & 0x40) offset = TICK_SIZE; |
| 362 | |
| 363 | ticks = MAC_CLOCK_TICK - ticks; |
| 364 | ticks = ticks * 10000L / MAC_CLOCK_TICK; |
| 365 | |
| 366 | return ticks + offset; |
| 367 | } |
| 368 | |
| 369 | /* |
| 370 | * Flush the L2 cache on Macs that have it by flipping |
| 371 | * the system into 24-bit mode for an instant. |
| 372 | */ |
| 373 | |
| 374 | void via_flush_cache(void) |
| 375 | { |
| 376 | via2[gBufB] &= ~VIA2B_vMode32; |
| 377 | via2[gBufB] |= VIA2B_vMode32; |
| 378 | } |
| 379 | |
| 380 | /* |
| 381 | * Return the status of the L2 cache on a IIci |
| 382 | */ |
| 383 | |
| 384 | int via_get_cache_disable(void) |
| 385 | { |
| 386 | /* Safeguard against being called accidentally */ |
| 387 | if (!via2) { |
| 388 | printk(KERN_ERR "via_get_cache_disable called on a non-VIA machine!\n"); |
| 389 | return 1; |
| 390 | } |
| 391 | |
| 392 | return (int) via2[gBufB] & VIA2B_vCDis; |
| 393 | } |
| 394 | |
| 395 | /* |
| 396 | * Initialize VIA2 for Nubus access |
| 397 | */ |
| 398 | |
| 399 | void __init via_nubus_init(void) |
| 400 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 401 | /* unlock nubus transactions */ |
| 402 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 403 | if ((macintosh_config->adb_type != MAC_ADB_PB1) && |
| 404 | (macintosh_config->adb_type != MAC_ADB_PB2)) { |
Finn Thain | 67dfb15 | 2007-05-01 22:32:56 +0200 | [diff] [blame] | 405 | /* set the line to be an output on non-RBV machines */ |
| 406 | if (!rbv_present) |
| 407 | via2[vDirB] |= 0x02; |
| 408 | |
| 409 | /* this seems to be an ADB bit on PMU machines */ |
| 410 | /* according to MkLinux. -- jmt */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 411 | via2[gBufB] |= 0x02; |
| 412 | } |
| 413 | |
Finn Thain | cd713dd | 2007-05-01 22:32:57 +0200 | [diff] [blame] | 414 | /* Disable all the slot interrupts (where possible). */ |
| 415 | |
| 416 | switch (macintosh_config->via_type) { |
| 417 | case MAC_VIA_II: |
| 418 | /* Just make the port A lines inputs. */ |
| 419 | switch(macintosh_config->ident) { |
| 420 | case MAC_MODEL_II: |
| 421 | case MAC_MODEL_IIX: |
| 422 | case MAC_MODEL_IICX: |
| 423 | case MAC_MODEL_SE30: |
| 424 | /* The top two bits are RAM size outputs. */ |
| 425 | via2[vDirA] &= 0xC0; |
| 426 | break; |
| 427 | default: |
| 428 | via2[vDirA] &= 0x80; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 429 | } |
Finn Thain | cd713dd | 2007-05-01 22:32:57 +0200 | [diff] [blame] | 430 | break; |
| 431 | case MAC_VIA_IIci: |
| 432 | /* RBV. Disable all the slot interrupts. SIER works like IER. */ |
| 433 | via2[rSIER] = 0x7F; |
| 434 | break; |
| 435 | case MAC_VIA_QUADRA: |
| 436 | /* Disable the inactive slot interrupts by making those lines outputs. */ |
| 437 | if ((macintosh_config->adb_type != MAC_ADB_PB1) && |
| 438 | (macintosh_config->adb_type != MAC_ADB_PB2)) { |
| 439 | via2[vBufA] |= 0x7F; |
| 440 | via2[vDirA] |= 0x7F; |
| 441 | } |
| 442 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 443 | } |
| 444 | } |
| 445 | |
| 446 | /* |
| 447 | * The generic VIA interrupt routines (shamelessly stolen from Alan Cox's |
| 448 | * via6522.c :-), disable/pending masks added. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 449 | */ |
| 450 | |
Al Viro | 2850bc2 | 2006-10-07 14:16:45 +0100 | [diff] [blame] | 451 | irqreturn_t via1_irq(int irq, void *dev_id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 452 | { |
Finn Thain | 67dfb15 | 2007-05-01 22:32:56 +0200 | [diff] [blame] | 453 | int irq_num; |
| 454 | unsigned char irq_bit, events; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 455 | |
Finn Thain | 67dfb15 | 2007-05-01 22:32:56 +0200 | [diff] [blame] | 456 | events = via1[vIFR] & via1[vIER] & 0x7F; |
| 457 | if (!events) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 458 | return IRQ_NONE; |
| 459 | |
Finn Thain | 67dfb15 | 2007-05-01 22:32:56 +0200 | [diff] [blame] | 460 | irq_num = VIA1_SOURCE_BASE; |
| 461 | irq_bit = 1; |
| 462 | do { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 463 | if (events & irq_bit) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 464 | via1[vIFR] = irq_bit; |
Finn Thain | 67dfb15 | 2007-05-01 22:32:56 +0200 | [diff] [blame] | 465 | m68k_handle_int(irq_num); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 466 | } |
Finn Thain | 67dfb15 | 2007-05-01 22:32:56 +0200 | [diff] [blame] | 467 | ++irq_num; |
| 468 | irq_bit <<= 1; |
| 469 | } while (events >= irq_bit); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 470 | |
| 471 | #if 0 /* freakin' pmu is doing weird stuff */ |
| 472 | if (!oss_present) { |
| 473 | /* This (still) seems to be necessary to get IDE |
| 474 | working. However, if you enable VBL interrupts, |
| 475 | you're screwed... */ |
| 476 | /* FIXME: should we check the SLOTIRQ bit before |
| 477 | pulling this stunt? */ |
| 478 | /* No, it won't be set. that's why we're doing this. */ |
| 479 | via_irq_disable(IRQ_MAC_NUBUS); |
| 480 | via_irq_clear(IRQ_MAC_NUBUS); |
Al Viro | 2850bc2 | 2006-10-07 14:16:45 +0100 | [diff] [blame] | 481 | m68k_handle_int(IRQ_MAC_NUBUS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 482 | via_irq_enable(IRQ_MAC_NUBUS); |
| 483 | } |
| 484 | #endif |
| 485 | return IRQ_HANDLED; |
| 486 | } |
| 487 | |
Al Viro | 2850bc2 | 2006-10-07 14:16:45 +0100 | [diff] [blame] | 488 | irqreturn_t via2_irq(int irq, void *dev_id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 489 | { |
Finn Thain | 67dfb15 | 2007-05-01 22:32:56 +0200 | [diff] [blame] | 490 | int irq_num; |
| 491 | unsigned char irq_bit, events; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 492 | |
Finn Thain | 67dfb15 | 2007-05-01 22:32:56 +0200 | [diff] [blame] | 493 | events = via2[gIFR] & via2[gIER] & 0x7F; |
| 494 | if (!events) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 495 | return IRQ_NONE; |
| 496 | |
Finn Thain | 67dfb15 | 2007-05-01 22:32:56 +0200 | [diff] [blame] | 497 | irq_num = VIA2_SOURCE_BASE; |
| 498 | irq_bit = 1; |
| 499 | do { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 500 | if (events & irq_bit) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 501 | via2[gIFR] = irq_bit | rbv_clear; |
Finn Thain | 67dfb15 | 2007-05-01 22:32:56 +0200 | [diff] [blame] | 502 | m68k_handle_int(irq_num); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 503 | } |
Finn Thain | 67dfb15 | 2007-05-01 22:32:56 +0200 | [diff] [blame] | 504 | ++irq_num; |
| 505 | irq_bit <<= 1; |
| 506 | } while (events >= irq_bit); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 507 | return IRQ_HANDLED; |
| 508 | } |
| 509 | |
| 510 | /* |
| 511 | * Dispatch Nubus interrupts. We are called as a secondary dispatch by the |
| 512 | * VIA2 dispatcher as a fast interrupt handler. |
| 513 | */ |
| 514 | |
Al Viro | 2850bc2 | 2006-10-07 14:16:45 +0100 | [diff] [blame] | 515 | irqreturn_t via_nubus_irq(int irq, void *dev_id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 516 | { |
Finn Thain | 67dfb15 | 2007-05-01 22:32:56 +0200 | [diff] [blame] | 517 | int slot_irq; |
| 518 | unsigned char slot_bit, events; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 519 | |
Finn Thain | 67dfb15 | 2007-05-01 22:32:56 +0200 | [diff] [blame] | 520 | events = ~via2[gBufA] & 0x7F; |
| 521 | if (rbv_present) |
| 522 | events &= via2[rSIER]; |
| 523 | else |
Finn Thain | cd713dd | 2007-05-01 22:32:57 +0200 | [diff] [blame] | 524 | events &= ~via2[vDirA]; |
Finn Thain | 67dfb15 | 2007-05-01 22:32:56 +0200 | [diff] [blame] | 525 | if (!events) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 526 | return IRQ_NONE; |
| 527 | |
Finn Thain | 67dfb15 | 2007-05-01 22:32:56 +0200 | [diff] [blame] | 528 | do { |
| 529 | slot_irq = IRQ_NUBUS_F; |
| 530 | slot_bit = 0x40; |
| 531 | do { |
| 532 | if (events & slot_bit) { |
| 533 | events &= ~slot_bit; |
| 534 | m68k_handle_int(slot_irq); |
| 535 | } |
| 536 | --slot_irq; |
| 537 | slot_bit >>= 1; |
| 538 | } while (events); |
| 539 | |
| 540 | /* clear the CA1 interrupt and make certain there's no more. */ |
| 541 | via2[gIFR] = 0x02 | rbv_clear; |
| 542 | events = ~via2[gBufA] & 0x7F; |
| 543 | if (rbv_present) |
| 544 | events &= via2[rSIER]; |
| 545 | else |
Finn Thain | cd713dd | 2007-05-01 22:32:57 +0200 | [diff] [blame] | 546 | events &= ~via2[vDirA]; |
Finn Thain | 67dfb15 | 2007-05-01 22:32:56 +0200 | [diff] [blame] | 547 | } while (events); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 548 | return IRQ_HANDLED; |
| 549 | } |
| 550 | |
| 551 | void via_irq_enable(int irq) { |
| 552 | int irq_src = IRQ_SRC(irq); |
| 553 | int irq_idx = IRQ_IDX(irq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 554 | |
| 555 | #ifdef DEBUG_IRQUSE |
| 556 | printk(KERN_DEBUG "via_irq_enable(%d)\n", irq); |
| 557 | #endif |
| 558 | |
| 559 | if (irq_src == 1) { |
Finn Thain | cd713dd | 2007-05-01 22:32:57 +0200 | [diff] [blame] | 560 | via1[vIER] = IER_SET_BIT(irq_idx); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 561 | } else if (irq_src == 2) { |
Finn Thain | cd713dd | 2007-05-01 22:32:57 +0200 | [diff] [blame] | 562 | if (irq != IRQ_MAC_NUBUS || nubus_disabled == 0) |
| 563 | via2[gIER] = IER_SET_BIT(irq_idx); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 564 | } else if (irq_src == 7) { |
Finn Thain | cd713dd | 2007-05-01 22:32:57 +0200 | [diff] [blame] | 565 | switch (macintosh_config->via_type) { |
| 566 | case MAC_VIA_II: |
| 567 | nubus_disabled &= ~(1 << irq_idx); |
| 568 | /* Enable the CA1 interrupt when no slot is disabled. */ |
| 569 | if (!nubus_disabled) |
| 570 | via2[gIER] = IER_SET_BIT(1); |
| 571 | break; |
| 572 | case MAC_VIA_IIci: |
| 573 | /* On RBV, enable the slot interrupt. |
| 574 | * SIER works like IER. |
| 575 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 576 | via2[rSIER] = IER_SET_BIT(irq_idx); |
Finn Thain | cd713dd | 2007-05-01 22:32:57 +0200 | [diff] [blame] | 577 | break; |
| 578 | case MAC_VIA_QUADRA: |
| 579 | /* Make the port A line an input to enable the slot irq. |
| 580 | * But not on PowerBooks, that's ADB. |
| 581 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 582 | if ((macintosh_config->adb_type != MAC_ADB_PB1) && |
Finn Thain | cd713dd | 2007-05-01 22:32:57 +0200 | [diff] [blame] | 583 | (macintosh_config->adb_type != MAC_ADB_PB2)) |
| 584 | via2[vDirA] &= ~(1 << irq_idx); |
| 585 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 586 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 587 | } |
| 588 | } |
| 589 | |
| 590 | void via_irq_disable(int irq) { |
| 591 | int irq_src = IRQ_SRC(irq); |
| 592 | int irq_idx = IRQ_IDX(irq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 593 | |
| 594 | #ifdef DEBUG_IRQUSE |
| 595 | printk(KERN_DEBUG "via_irq_disable(%d)\n", irq); |
| 596 | #endif |
| 597 | |
| 598 | if (irq_src == 1) { |
Finn Thain | cd713dd | 2007-05-01 22:32:57 +0200 | [diff] [blame] | 599 | via1[vIER] = IER_CLR_BIT(irq_idx); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 600 | } else if (irq_src == 2) { |
Finn Thain | cd713dd | 2007-05-01 22:32:57 +0200 | [diff] [blame] | 601 | via2[gIER] = IER_CLR_BIT(irq_idx); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 602 | } else if (irq_src == 7) { |
Finn Thain | cd713dd | 2007-05-01 22:32:57 +0200 | [diff] [blame] | 603 | switch (macintosh_config->via_type) { |
| 604 | case MAC_VIA_II: |
| 605 | nubus_disabled |= 1 << irq_idx; |
| 606 | if (nubus_disabled) |
| 607 | via2[gIER] = IER_CLR_BIT(1); |
| 608 | break; |
| 609 | case MAC_VIA_IIci: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 610 | via2[rSIER] = IER_CLR_BIT(irq_idx); |
Finn Thain | cd713dd | 2007-05-01 22:32:57 +0200 | [diff] [blame] | 611 | break; |
| 612 | case MAC_VIA_QUADRA: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 613 | if ((macintosh_config->adb_type != MAC_ADB_PB1) && |
Finn Thain | cd713dd | 2007-05-01 22:32:57 +0200 | [diff] [blame] | 614 | (macintosh_config->adb_type != MAC_ADB_PB2)) |
| 615 | via2[vDirA] |= 1 << irq_idx; |
| 616 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 617 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 618 | } |
| 619 | } |
| 620 | |
| 621 | void via_irq_clear(int irq) { |
| 622 | int irq_src = IRQ_SRC(irq); |
| 623 | int irq_idx = IRQ_IDX(irq); |
| 624 | int irq_bit = 1 << irq_idx; |
| 625 | |
| 626 | if (irq_src == 1) { |
| 627 | via1[vIFR] = irq_bit; |
| 628 | } else if (irq_src == 2) { |
| 629 | via2[gIFR] = irq_bit | rbv_clear; |
| 630 | } else if (irq_src == 7) { |
Finn Thain | 67dfb15 | 2007-05-01 22:32:56 +0200 | [diff] [blame] | 631 | /* FIXME: There is no way to clear an individual nubus slot |
| 632 | * IRQ flag, other than getting the device to do it. |
| 633 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 634 | } |
| 635 | } |
| 636 | |
| 637 | /* |
| 638 | * Returns nonzero if an interrupt is pending on the given |
| 639 | * VIA/IRQ combination. |
| 640 | */ |
| 641 | |
| 642 | int via_irq_pending(int irq) |
| 643 | { |
| 644 | int irq_src = IRQ_SRC(irq); |
| 645 | int irq_idx = IRQ_IDX(irq); |
| 646 | int irq_bit = 1 << irq_idx; |
| 647 | |
| 648 | if (irq_src == 1) { |
| 649 | return via1[vIFR] & irq_bit; |
| 650 | } else if (irq_src == 2) { |
| 651 | return via2[gIFR] & irq_bit; |
| 652 | } else if (irq_src == 7) { |
Finn Thain | cd713dd | 2007-05-01 22:32:57 +0200 | [diff] [blame] | 653 | /* Always 0 for MAC_VIA_QUADRA if the slot irq is disabled. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 654 | return ~via2[gBufA] & irq_bit; |
| 655 | } |
| 656 | return 0; |
| 657 | } |