/arch/mips/sgi-ip22/ip22-int.c

https://bitbucket.org/thekraven/iscream_thunderc-2.6.35 · C · 341 lines · 243 code · 45 blank · 53 comment · 43 complexity · 4bd366442b62b32bc84d511c79073055 MD5 · raw file 

    

  1. /*
    2. 

  2.  * ip22-int.c: Routines for generic manipulation of the INT[23] ASIC
    3. 

  3.  *             found on INDY and Indigo2 workstations.
    4. 

  4.  *
    5. 

  5.  * Copyright (C) 1996 David S. Miller (dm@engr.sgi.com)
    6. 

  6.  * Copyright (C) 1997, 1998 Ralf Baechle (ralf@gnu.org)
    7. 

  7.  * Copyright (C) 1999 Andrew R. Baker (andrewb@uab.edu)
    8. 

  8.  *                    - Indigo2 changes
    9. 

  9.  *                    - Interrupt handling fixes
    10. 

  10.  * Copyright (C) 2001, 2003 Ladislav Michl (ladis@linux-mips.org)
    11. 

  11.  */
    12. 

  12. #include <linux/types.h>
    13. 

  13. #include <linux/init.h>
    14. 

  14. #include <linux/kernel_stat.h>
    15. 

  15. #include <linux/interrupt.h>
    16. 

  16. #include <linux/ftrace.h>
    17. 

  17. 

  18. #include <asm/irq_cpu.h>
    19. 

  19. #include <asm/sgi/hpc3.h>
    20. 

  20. #include <asm/sgi/ip22.h>
    21. 

  21. 

  22. /* So far nothing hangs here */
    23. 

  23. #undef USE_LIO3_IRQ
    24. 

  24. 

  25. struct sgint_regs *sgint;
    26. 

  26. 

  27. static char lc0msk_to_irqnr[256];
    28. 

  28. static char lc1msk_to_irqnr[256];
    29. 

  29. static char lc2msk_to_irqnr[256];
    30. 

  30. static char lc3msk_to_irqnr[256];
    31. 

  31. 

  32. extern int ip22_eisa_init(void);
    33. 

  33. 

  34. static void enable_local0_irq(unsigned int irq)
    35. 

  35. {
    36. 

  36. 	/* don't allow mappable interrupt to be enabled from setup_irq,
    37. 

  37. 	 * we have our own way to do so */
    38. 

  38. 	if (irq != SGI_MAP_0_IRQ)
    39. 

  39. 		sgint->imask0 |= (1 << (irq - SGINT_LOCAL0));
    40. 

  40. }
    41. 

  41. 

  42. static void disable_local0_irq(unsigned int irq)
    43. 

  43. {
    44. 

  44. 	sgint->imask0 &= ~(1 << (irq - SGINT_LOCAL0));
    45. 

  45. }
    46. 

  46. 

  47. static struct irq_chip ip22_local0_irq_type = {
    48. 

  48. 	.name		= "IP22 local 0",
    49. 

  49. 	.ack		= disable_local0_irq,
    50. 

  50. 	.mask		= disable_local0_irq,
    51. 

  51. 	.mask_ack	= disable_local0_irq,
    52. 

  52. 	.unmask		= enable_local0_irq,
    53. 

  53. };
    54. 

  54. 

  55. static void enable_local1_irq(unsigned int irq)
    56. 

  56. {
    57. 

  57. 	/* don't allow mappable interrupt to be enabled from setup_irq,
    58. 

  58. 	 * we have our own way to do so */
    59. 

  59. 	if (irq != SGI_MAP_1_IRQ)
    60. 

  60. 		sgint->imask1 |= (1 << (irq - SGINT_LOCAL1));
    61. 

  61. }
    62. 

  62. 

  63. static void disable_local1_irq(unsigned int irq)
    64. 

  64. {
    65. 

  65. 	sgint->imask1 &= ~(1 << (irq - SGINT_LOCAL1));
    66. 

  66. }
    67. 

  67. 

  68. static struct irq_chip ip22_local1_irq_type = {
    69. 

  69. 	.name		= "IP22 local 1",
    70. 

  70. 	.ack		= disable_local1_irq,
    71. 

  71. 	.mask		= disable_local1_irq,
    72. 

  72. 	.mask_ack	= disable_local1_irq,
    73. 

  73. 	.unmask		= enable_local1_irq,
    74. 

  74. };
    75. 

  75. 

  76. static void enable_local2_irq(unsigned int irq)
    77. 

  77. {
    78. 

  78. 	sgint->imask0 |= (1 << (SGI_MAP_0_IRQ - SGINT_LOCAL0));
    79. 

  79. 	sgint->cmeimask0 |= (1 << (irq - SGINT_LOCAL2));
    80. 

  80. }
    81. 

  81. 

  82. static void disable_local2_irq(unsigned int irq)
    83. 

  83. {
    84. 

  84. 	sgint->cmeimask0 &= ~(1 << (irq - SGINT_LOCAL2));
    85. 

  85. 	if (!sgint->cmeimask0)
    86. 

  86. 		sgint->imask0 &= ~(1 << (SGI_MAP_0_IRQ - SGINT_LOCAL0));
    87. 

  87. }
    88. 

  88. 

  89. static struct irq_chip ip22_local2_irq_type = {
    90. 

  90. 	.name		= "IP22 local 2",
    91. 

  91. 	.ack		= disable_local2_irq,
    92. 

  92. 	.mask		= disable_local2_irq,
    93. 

  93. 	.mask_ack	= disable_local2_irq,
    94. 

  94. 	.unmask		= enable_local2_irq,
    95. 

  95. };
    96. 

  96. 

  97. static void enable_local3_irq(unsigned int irq)
    98. 

  98. {
    99. 

  99. 	sgint->imask1 |= (1 << (SGI_MAP_1_IRQ - SGINT_LOCAL1));
    100. 

  100. 	sgint->cmeimask1 |= (1 << (irq - SGINT_LOCAL3));
    101. 

  101. }
    102. 

  102. 

  103. static void disable_local3_irq(unsigned int irq)
    104. 

  104. {
    105. 

  105. 	sgint->cmeimask1 &= ~(1 << (irq - SGINT_LOCAL3));
    106. 

  106. 	if (!sgint->cmeimask1)
    107. 

  107. 		sgint->imask1 &= ~(1 << (SGI_MAP_1_IRQ - SGINT_LOCAL1));
    108. 

  108. }
    109. 

  109. 

  110. static struct irq_chip ip22_local3_irq_type = {
    111. 

  111. 	.name		= "IP22 local 3",
    112. 

  112. 	.ack		= disable_local3_irq,
    113. 

  113. 	.mask		= disable_local3_irq,
    114. 

  114. 	.mask_ack	= disable_local3_irq,
    115. 

  115. 	.unmask		= enable_local3_irq,
    116. 

  116. };
    117. 

  117. 

  118. static void indy_local0_irqdispatch(void)
    119. 

  119. {
    120. 

  120. 	u8 mask = sgint->istat0 & sgint->imask0;
    121. 

  121. 	u8 mask2;
    122. 

  122. 	int irq;
    123. 

  123. 

  124. 	if (mask & SGINT_ISTAT0_LIO2) {
    125. 

  125. 		mask2 = sgint->vmeistat & sgint->cmeimask0;
    126. 

  126. 		irq = lc2msk_to_irqnr[mask2];
    127. 

  127. 	} else
    128. 

  128. 		irq = lc0msk_to_irqnr[mask];
    129. 

  129. 

  130. 	/* if irq == 0, then the interrupt has already been cleared */
    131. 

  131. 	if (irq)
    132. 

  132. 		do_IRQ(irq);
    133. 

  133. }
    134. 

  134. 

  135. static void indy_local1_irqdispatch(void)
    136. 

  136. {
    137. 

  137. 	u8 mask = sgint->istat1 & sgint->imask1;
    138. 

  138. 	u8 mask2;
    139. 

  139. 	int irq;
    140. 

  140. 

  141. 	if (mask & SGINT_ISTAT1_LIO3) {
    142. 

  142. 		mask2 = sgint->vmeistat & sgint->cmeimask1;
    143. 

  143. 		irq = lc3msk_to_irqnr[mask2];
    144. 

  144. 	} else
    145. 

  145. 		irq = lc1msk_to_irqnr[mask];
    146. 

  146. 

  147. 	/* if irq == 0, then the interrupt has already been cleared */
    148. 

  148. 	if (irq)
    149. 

  149. 		do_IRQ(irq);
    150. 

  150. }
    151. 

  151. 

  152. extern void ip22_be_interrupt(int irq);
    153. 

  153. 

  154. static void __irq_entry indy_buserror_irq(void)
    155. 

  155. {
    156. 

  156. 	int irq = SGI_BUSERR_IRQ;
    157. 

  157. 

  158. 	irq_enter();
    159. 

  159. 	kstat_incr_irqs_this_cpu(irq, irq_to_desc(irq));
    160. 

  160. 	ip22_be_interrupt(irq);
    161. 

  161. 	irq_exit();
    162. 

  162. }
    163. 

  163. 

  164. static struct irqaction local0_cascade = {
    165. 

  165. 	.handler	= no_action,
    166. 

  166. 	.flags		= IRQF_DISABLED,
    167. 

  167. 	.name		= "local0 cascade",
    168. 

  168. };
    169. 

  169. 

  170. static struct irqaction local1_cascade = {
    171. 

  171. 	.handler	= no_action,
    172. 

  172. 	.flags		= IRQF_DISABLED,
    173. 

  173. 	.name		= "local1 cascade",
    174. 

  174. };
    175. 

  175. 

  176. static struct irqaction buserr = {
    177. 

  177. 	.handler	= no_action,
    178. 

  178. 	.flags		= IRQF_DISABLED,
    179. 

  179. 	.name		= "Bus Error",
    180. 

  180. };
    181. 

  181. 

  182. static struct irqaction map0_cascade = {
    183. 

  183. 	.handler	= no_action,
    184. 

  184. 	.flags		= IRQF_DISABLED,
    185. 

  185. 	.name		= "mapable0 cascade",
    186. 

  186. };
    187. 

  187. 

  188. #ifdef USE_LIO3_IRQ
    189. 

  189. static struct irqaction map1_cascade = {
    190. 

  190. 	.handler	= no_action,
    191. 

  191. 	.flags		= IRQF_DISABLED,
    192. 

  192. 	.name		= "mapable1 cascade",
    193. 

  193. };
    194. 

  194. #define SGI_INTERRUPTS	SGINT_END
    195. 

  195. #else
    196. 

  196. #define SGI_INTERRUPTS	SGINT_LOCAL3
    197. 

  197. #endif
    198. 

  198. 

  199. extern void indy_8254timer_irq(void);
    200. 

  200. 

  201. /*
    202. 

  202.  * IRQs on the INDY look basically (barring software IRQs which we don't use
    203. 

  203.  * at all) like:
    204. 

  204.  *
    205. 

  205.  *	MIPS IRQ	Source
    206. 

  206.  *      --------        ------
    207. 

  207.  *             0	Software (ignored)
    208. 

  208.  *             1        Software (ignored)
    209. 

  209.  *             2        Local IRQ level zero
    210. 

  210.  *             3        Local IRQ level one
    211. 

  211.  *             4        8254 Timer zero
    212. 

  212.  *             5        8254 Timer one
    213. 

  213.  *             6        Bus Error
    214. 

  214.  *             7        R4k timer (what we use)
    215. 

  215.  *
    216. 

  216.  * We handle the IRQ according to _our_ priority which is:
    217. 

  217.  *
    218. 

  218.  * Highest ----     R4k Timer
    219. 

  219.  *                  Local IRQ zero
    220. 

  220.  *                  Local IRQ one
    221. 

  221.  *                  Bus Error
    222. 

  222.  *                  8254 Timer zero
    223. 

  223.  * Lowest  ----     8254 Timer one
    224. 

  224.  *
    225. 

  225.  * then we just return, if multiple IRQs are pending then we will just take
    226. 

  226.  * another exception, big deal.
    227. 

  227.  */
    228. 

  228. 

  229. asmlinkage void plat_irq_dispatch(void)
    230. 

  230. {
    231. 

  231. 	unsigned int pending = read_c0_status() & read_c0_cause();
    232. 

  232. 

  233. 	/*
    234. 

  234. 	 * First we check for r4k counter/timer IRQ.
    235. 

  235. 	 */
    236. 

  236. 	if (pending & CAUSEF_IP7)
    237. 

  237. 		do_IRQ(SGI_TIMER_IRQ);
    238. 

  238. 	else if (pending & CAUSEF_IP2)
    239. 

  239. 		indy_local0_irqdispatch();
    240. 

  240. 	else if (pending & CAUSEF_IP3)
    241. 

  241. 		indy_local1_irqdispatch();
    242. 

  242. 	else if (pending & CAUSEF_IP6)
    243. 

  243. 		indy_buserror_irq();
    244. 

  244. 	else if (pending & (CAUSEF_IP4 | CAUSEF_IP5))
    245. 

  245. 		indy_8254timer_irq();
    246. 

  246. }
    247. 

  247. 

  248. void __init arch_init_irq(void)
    249. 

  249. {
    250. 

  250. 	int i;
    251. 

  251. 

  252. 	/* Init local mask --> irq tables. */
    253. 

  253. 	for (i = 0; i < 256; i++) {
    254. 

  254. 		if (i & 0x80) {
    255. 

  255. 			lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 7;
    256. 

  256. 			lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 7;
    257. 

  257. 			lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 7;
    258. 

  258. 			lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 7;
    259. 

  259. 		} else if (i & 0x40) {
    260. 

  260. 			lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 6;
    261. 

  261. 			lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 6;
    262. 

  262. 			lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 6;
    263. 

  263. 			lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 6;
    264. 

  264. 		} else if (i & 0x20) {
    265. 

  265. 			lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 5;
    266. 

  266. 			lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 5;
    267. 

  267. 			lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 5;
    268. 

  268. 			lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 5;
    269. 

  269. 		} else if (i & 0x10) {
    270. 

  270. 			lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 4;
    271. 

  271. 			lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 4;
    272. 

  272. 			lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 4;
    273. 

  273. 			lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 4;
    274. 

  274. 		} else if (i & 0x08) {
    275. 

  275. 			lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 3;
    276. 

  276. 			lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 3;
    277. 

  277. 			lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 3;
    278. 

  278. 			lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 3;
    279. 

  279. 		} else if (i & 0x04) {
    280. 

  280. 			lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 2;
    281. 

  281. 			lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 2;
    282. 

  282. 			lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 2;
    283. 

  283. 			lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 2;
    284. 

  284. 		} else if (i & 0x02) {
    285. 

  285. 			lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 1;
    286. 

  286. 			lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 1;
    287. 

  287. 			lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 1;
    288. 

  288. 			lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 1;
    289. 

  289. 		} else if (i & 0x01) {
    290. 

  290. 			lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 0;
    291. 

  291. 			lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 0;
    292. 

  292. 			lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 0;
    293. 

  293. 			lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 0;
    294. 

  294. 		} else {
    295. 

  295. 			lc0msk_to_irqnr[i] = 0;
    296. 

  296. 			lc1msk_to_irqnr[i] = 0;
    297. 

  297. 			lc2msk_to_irqnr[i] = 0;
    298. 

  298. 			lc3msk_to_irqnr[i] = 0;
    299. 

  299. 		}
    300. 

  300. 	}
    301. 

  301. 

  302. 	/* Mask out all interrupts. */
    303. 

  303. 	sgint->imask0 = 0;
    304. 

  304. 	sgint->imask1 = 0;
    305. 

  305. 	sgint->cmeimask0 = 0;
    306. 

  306. 	sgint->cmeimask1 = 0;
    307. 

  307. 

  308. 	/* init CPU irqs */
    309. 

  309. 	mips_cpu_irq_init();
    310. 

  310. 

  311. 	for (i = SGINT_LOCAL0; i < SGI_INTERRUPTS; i++) {
    312. 

  312. 		struct irq_chip *handler;
    313. 

  313. 

  314. 		if (i < SGINT_LOCAL1)
    315. 

  315. 			handler		= &ip22_local0_irq_type;
    316. 

  316. 		else if (i < SGINT_LOCAL2)
    317. 

  317. 			handler		= &ip22_local1_irq_type;
    318. 

  318. 		else if (i < SGINT_LOCAL3)
    319. 

  319. 			handler		= &ip22_local2_irq_type;
    320. 

  320. 		else
    321. 

  321. 			handler		= &ip22_local3_irq_type;
    322. 

  322. 

  323. 		set_irq_chip_and_handler(i, handler, handle_level_irq);
    324. 

  324. 	}
    325. 

  325. 

  326. 	/* vector handler. this register the IRQ as non-sharable */
    327. 

  327. 	setup_irq(SGI_LOCAL_0_IRQ, &local0_cascade);
    328. 

  328. 	setup_irq(SGI_LOCAL_1_IRQ, &local1_cascade);
    329. 

  329. 	setup_irq(SGI_BUSERR_IRQ, &buserr);
    330. 

  330. 

  331. 	/* cascade in cascade. i love Indy ;-) */
    332. 

  332. 	setup_irq(SGI_MAP_0_IRQ, &map0_cascade);
    333. 

  333. #ifdef USE_LIO3_IRQ
    334. 

  334. 	setup_irq(SGI_MAP_1_IRQ, &map1_cascade);
    335. 

  335. #endif
    336. 

  336. 

  337. #ifdef CONFIG_EISA
    338. 

  338. 	if (ip22_is_fullhouse())	/* Only Indigo-2 has EISA stuff */
    339. 

  339. 		ip22_eisa_init();
    340. 

  340. #endif
    341. 

  341. }
    342.