ataints.c 10.0 KB

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  1. /*
  2. * arch/m68k/atari/ataints.c -- Atari Linux interrupt handling code
  3. *
  4. * 5/2/94 Roman Hodek:
  5. * Added support for TT interrupts; setup for TT SCU (may someone has
  6. * twiddled there and we won't get the right interrupts :-()
  7. *
  8. * Major change: The device-independent code in m68k/ints.c didn't know
  9. * about non-autovec ints yet. It hardcoded the number of possible ints to
  10. * 7 (IRQ1...IRQ7). But the Atari has lots of non-autovec ints! I made the
  11. * number of possible ints a constant defined in interrupt.h, which is
  12. * 47 for the Atari. So we can call request_irq() for all Atari interrupts
  13. * just the normal way. Additionally, all vectors >= 48 are initialized to
  14. * call trap() instead of inthandler(). This must be changed here, too.
  15. *
  16. * 1995-07-16 Lars Brinkhoff <f93labr@dd.chalmers.se>:
  17. * Corrected a bug in atari_add_isr() which rejected all SCC
  18. * interrupt sources if there were no TT MFP!
  19. *
  20. * 12/13/95: New interface functions atari_level_triggered_int() and
  21. * atari_register_vme_int() as support for level triggered VME interrupts.
  22. *
  23. * 02/12/96: (Roman)
  24. * Total rewrite of Atari interrupt handling, for new scheme see comments
  25. * below.
  26. *
  27. * 1996-09-03 lars brinkhoff <f93labr@dd.chalmers.se>:
  28. * Added new function atari_unregister_vme_int(), and
  29. * modified atari_register_vme_int() as well as IS_VALID_INTNO()
  30. * to work with it.
  31. *
  32. * This file is subject to the terms and conditions of the GNU General Public
  33. * License. See the file COPYING in the main directory of this archive
  34. * for more details.
  35. *
  36. */
  37. #include <linux/types.h>
  38. #include <linux/kernel.h>
  39. #include <linux/kernel_stat.h>
  40. #include <linux/init.h>
  41. #include <linux/seq_file.h>
  42. #include <linux/module.h>
  43. #include <linux/irq.h>
  44. #include <asm/traps.h>
  45. #include <asm/atarihw.h>
  46. #include <asm/atariints.h>
  47. #include <asm/atari_stdma.h>
  48. #include <asm/irq.h>
  49. #include <asm/entry.h>
  50. #include <asm/io.h>
  51. /*
  52. * Atari interrupt handling scheme:
  53. * --------------------------------
  54. *
  55. * All interrupt source have an internal number (defined in
  56. * <asm/atariints.h>): Autovector interrupts are 1..7, then follow ST-MFP,
  57. * TT-MFP, SCC, and finally VME interrupts. Vector numbers for the latter can
  58. * be allocated by atari_register_vme_int().
  59. */
  60. /*
  61. * Bitmap for free interrupt vector numbers
  62. * (new vectors starting from 0x70 can be allocated by
  63. * atari_register_vme_int())
  64. */
  65. static int free_vme_vec_bitmap;
  66. /* GK:
  67. * HBL IRQ handler for Falcon. Nobody needs it :-)
  68. * ++andreas: raise ipl to disable further HBLANK interrupts.
  69. */
  70. asmlinkage void falcon_hblhandler(void);
  71. asm(".text\n"
  72. __ALIGN_STR "\n\t"
  73. "falcon_hblhandler:\n\t"
  74. "orw #0x200,%sp@\n\t" /* set saved ipl to 2 */
  75. "rte");
  76. extern void atari_microwire_cmd(int cmd);
  77. static unsigned int atari_irq_startup(struct irq_data *data)
  78. {
  79. unsigned int irq = data->irq;
  80. m68k_irq_startup(data);
  81. atari_turnon_irq(irq);
  82. atari_enable_irq(irq);
  83. return 0;
  84. }
  85. static void atari_irq_shutdown(struct irq_data *data)
  86. {
  87. unsigned int irq = data->irq;
  88. atari_disable_irq(irq);
  89. atari_turnoff_irq(irq);
  90. m68k_irq_shutdown(data);
  91. if (irq == IRQ_AUTO_4)
  92. vectors[VEC_INT4] = falcon_hblhandler;
  93. }
  94. static void atari_irq_enable(struct irq_data *data)
  95. {
  96. atari_enable_irq(data->irq);
  97. }
  98. static void atari_irq_disable(struct irq_data *data)
  99. {
  100. atari_disable_irq(data->irq);
  101. }
  102. static struct irq_chip atari_irq_chip = {
  103. .name = "atari",
  104. .irq_startup = atari_irq_startup,
  105. .irq_shutdown = atari_irq_shutdown,
  106. .irq_enable = atari_irq_enable,
  107. .irq_disable = atari_irq_disable,
  108. };
  109. /*
  110. * ST-MFP timer D chained interrupts - each driver gets its own timer
  111. * interrupt instance.
  112. */
  113. struct mfptimerbase {
  114. volatile struct MFP *mfp;
  115. unsigned char mfp_mask, mfp_data;
  116. unsigned short int_mask;
  117. int handler_irq, mfptimer_irq, server_irq;
  118. char *name;
  119. } stmfp_base = {
  120. .mfp = &st_mfp,
  121. .int_mask = 0x0,
  122. .handler_irq = IRQ_MFP_TIMD,
  123. .mfptimer_irq = IRQ_MFP_TIMER1,
  124. .name = "MFP Timer D"
  125. };
  126. static irqreturn_t mfp_timer_d_handler(int irq, void *dev_id)
  127. {
  128. struct mfptimerbase *base = dev_id;
  129. int mach_irq;
  130. unsigned char ints;
  131. mach_irq = base->mfptimer_irq;
  132. ints = base->int_mask;
  133. for (; ints; mach_irq++, ints >>= 1) {
  134. if (ints & 1)
  135. generic_handle_irq(mach_irq);
  136. }
  137. return IRQ_HANDLED;
  138. }
  139. static void atari_mfptimer_enable(struct irq_data *data)
  140. {
  141. int mfp_num = data->irq - IRQ_MFP_TIMER1;
  142. stmfp_base.int_mask |= 1 << mfp_num;
  143. atari_enable_irq(IRQ_MFP_TIMD);
  144. }
  145. static void atari_mfptimer_disable(struct irq_data *data)
  146. {
  147. int mfp_num = data->irq - IRQ_MFP_TIMER1;
  148. stmfp_base.int_mask &= ~(1 << mfp_num);
  149. if (!stmfp_base.int_mask)
  150. atari_disable_irq(IRQ_MFP_TIMD);
  151. }
  152. static struct irq_chip atari_mfptimer_chip = {
  153. .name = "timer_d",
  154. .irq_enable = atari_mfptimer_enable,
  155. .irq_disable = atari_mfptimer_disable,
  156. };
  157. /*
  158. * EtherNAT CPLD interrupt handling
  159. * CPLD interrupt register is at phys. 0x80000023
  160. * Need this mapped in at interrupt startup time
  161. * Possibly need this mapped on demand anyway -
  162. * EtherNAT USB driver needs to disable IRQ before
  163. * startup!
  164. */
  165. static unsigned char *enat_cpld;
  166. static unsigned int atari_ethernat_startup(struct irq_data *data)
  167. {
  168. int enat_num = 140 - data->irq + 1;
  169. m68k_irq_startup(data);
  170. /*
  171. * map CPLD interrupt register
  172. */
  173. if (!enat_cpld)
  174. enat_cpld = (unsigned char *)ioremap((ATARI_ETHERNAT_PHYS_ADDR+0x23), 0x2);
  175. /*
  176. * do _not_ enable the USB chip interrupt here - causes interrupt storm
  177. * and triggers dead interrupt watchdog
  178. * Need to reset the USB chip to a sane state in early startup before
  179. * removing this hack
  180. */
  181. if (enat_num == 1)
  182. *enat_cpld |= 1 << enat_num;
  183. return 0;
  184. }
  185. static void atari_ethernat_enable(struct irq_data *data)
  186. {
  187. int enat_num = 140 - data->irq + 1;
  188. /*
  189. * map CPLD interrupt register
  190. */
  191. if (!enat_cpld)
  192. enat_cpld = (unsigned char *)ioremap((ATARI_ETHERNAT_PHYS_ADDR+0x23), 0x2);
  193. *enat_cpld |= 1 << enat_num;
  194. }
  195. static void atari_ethernat_disable(struct irq_data *data)
  196. {
  197. int enat_num = 140 - data->irq + 1;
  198. /*
  199. * map CPLD interrupt register
  200. */
  201. if (!enat_cpld)
  202. enat_cpld = (unsigned char *)ioremap((ATARI_ETHERNAT_PHYS_ADDR+0x23), 0x2);
  203. *enat_cpld &= ~(1 << enat_num);
  204. }
  205. static void atari_ethernat_shutdown(struct irq_data *data)
  206. {
  207. int enat_num = 140 - data->irq + 1;
  208. if (enat_cpld) {
  209. *enat_cpld &= ~(1 << enat_num);
  210. iounmap(enat_cpld);
  211. enat_cpld = NULL;
  212. }
  213. }
  214. static struct irq_chip atari_ethernat_chip = {
  215. .name = "ethernat",
  216. .irq_startup = atari_ethernat_startup,
  217. .irq_shutdown = atari_ethernat_shutdown,
  218. .irq_enable = atari_ethernat_enable,
  219. .irq_disable = atari_ethernat_disable,
  220. };
  221. /*
  222. * void atari_init_IRQ (void)
  223. *
  224. * Parameters: None
  225. *
  226. * Returns: Nothing
  227. *
  228. * This function should be called during kernel startup to initialize
  229. * the atari IRQ handling routines.
  230. */
  231. void __init atari_init_IRQ(void)
  232. {
  233. m68k_setup_user_interrupt(VEC_USER, NUM_ATARI_SOURCES - IRQ_USER);
  234. m68k_setup_irq_controller(&atari_irq_chip, handle_simple_irq, 1,
  235. NUM_ATARI_SOURCES - 1);
  236. /* Initialize the MFP(s) */
  237. #ifdef ATARI_USE_SOFTWARE_EOI
  238. st_mfp.vec_adr = 0x48; /* Software EOI-Mode */
  239. #else
  240. st_mfp.vec_adr = 0x40; /* Automatic EOI-Mode */
  241. #endif
  242. st_mfp.int_en_a = 0x00; /* turn off MFP-Ints */
  243. st_mfp.int_en_b = 0x00;
  244. st_mfp.int_mk_a = 0xff; /* no Masking */
  245. st_mfp.int_mk_b = 0xff;
  246. if (ATARIHW_PRESENT(TT_MFP)) {
  247. #ifdef ATARI_USE_SOFTWARE_EOI
  248. tt_mfp.vec_adr = 0x58; /* Software EOI-Mode */
  249. #else
  250. tt_mfp.vec_adr = 0x50; /* Automatic EOI-Mode */
  251. #endif
  252. tt_mfp.int_en_a = 0x00; /* turn off MFP-Ints */
  253. tt_mfp.int_en_b = 0x00;
  254. tt_mfp.int_mk_a = 0xff; /* no Masking */
  255. tt_mfp.int_mk_b = 0xff;
  256. }
  257. if (ATARIHW_PRESENT(SCC) && !atari_SCC_reset_done) {
  258. atari_scc.cha_a_ctrl = 9;
  259. MFPDELAY();
  260. atari_scc.cha_a_ctrl = (char) 0xc0; /* hardware reset */
  261. }
  262. if (ATARIHW_PRESENT(SCU)) {
  263. /* init the SCU if present */
  264. tt_scu.sys_mask = 0x10; /* enable VBL (for the cursor) and
  265. * disable HSYNC interrupts (who
  266. * needs them?) MFP and SCC are
  267. * enabled in VME mask
  268. */
  269. tt_scu.vme_mask = 0x60; /* enable MFP and SCC ints */
  270. } else {
  271. /* If no SCU and no Hades, the HSYNC interrupt needs to be
  272. * disabled this way. (Else _inthandler in kernel/sys_call.S
  273. * gets overruns)
  274. */
  275. vectors[VEC_INT2] = falcon_hblhandler;
  276. vectors[VEC_INT4] = falcon_hblhandler;
  277. }
  278. if (ATARIHW_PRESENT(PCM_8BIT) && ATARIHW_PRESENT(MICROWIRE)) {
  279. /* Initialize the LM1992 Sound Controller to enable
  280. the PSG sound. This is misplaced here, it should
  281. be in an atasound_init(), that doesn't exist yet. */
  282. atari_microwire_cmd(MW_LM1992_PSG_HIGH);
  283. }
  284. stdma_init();
  285. /* Initialize the PSG: all sounds off, both ports output */
  286. sound_ym.rd_data_reg_sel = 7;
  287. sound_ym.wd_data = 0xff;
  288. m68k_setup_irq_controller(&atari_mfptimer_chip, handle_simple_irq,
  289. IRQ_MFP_TIMER1, 8);
  290. irq_set_status_flags(IRQ_MFP_TIMER1, IRQ_IS_POLLED);
  291. irq_set_status_flags(IRQ_MFP_TIMER2, IRQ_IS_POLLED);
  292. /* prepare timer D data for use as poll interrupt */
  293. /* set Timer D data Register - needs to be > 0 */
  294. st_mfp.tim_dt_d = 254; /* < 100 Hz */
  295. /* start timer D, div = 1:100 */
  296. st_mfp.tim_ct_cd = (st_mfp.tim_ct_cd & 0xf0) | 0x6;
  297. /* request timer D dispatch handler */
  298. if (request_irq(IRQ_MFP_TIMD, mfp_timer_d_handler, IRQF_SHARED,
  299. stmfp_base.name, &stmfp_base))
  300. pr_err("Couldn't register %s interrupt\n", stmfp_base.name);
  301. /*
  302. * EtherNAT ethernet / USB interrupt handlers
  303. */
  304. m68k_setup_irq_controller(&atari_ethernat_chip, handle_simple_irq,
  305. 139, 2);
  306. }
  307. /*
  308. * atari_register_vme_int() returns the number of a free interrupt vector for
  309. * hardware with a programmable int vector (probably a VME board).
  310. */
  311. unsigned int atari_register_vme_int(void)
  312. {
  313. int i;
  314. for (i = 0; i < 32; i++)
  315. if ((free_vme_vec_bitmap & (1 << i)) == 0)
  316. break;
  317. if (i == 16)
  318. return 0;
  319. free_vme_vec_bitmap |= 1 << i;
  320. return VME_SOURCE_BASE + i;
  321. }
  322. EXPORT_SYMBOL(atari_register_vme_int);
  323. void atari_unregister_vme_int(unsigned int irq)
  324. {
  325. if (irq >= VME_SOURCE_BASE && irq < VME_SOURCE_BASE + VME_MAX_SOURCES) {
  326. irq -= VME_SOURCE_BASE;
  327. free_vme_vec_bitmap &= ~(1 << irq);
  328. }
  329. }
  330. EXPORT_SYMBOL(atari_unregister_vme_int);