2 * arch/sparc/kernel/sun4c_irq.c:
4 * djhr: Hacked out of irq.c into a CPU dependent version.
6 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
7 * Copyright (C) 1995 Miguel de Icaza (miguel@nuclecu.unam.mx)
8 * Copyright (C) 1995 Pete A. Zaitcev (zaitcev@yahoo.com)
9 * Copyright (C) 1996 Dave Redman (djhr@tadpole.co.uk)
12 #include <linux/errno.h>
13 #include <linux/linkage.h>
14 #include <linux/kernel_stat.h>
15 #include <linux/signal.h>
16 #include <linux/sched.h>
17 #include <linux/ptrace.h>
18 #include <linux/interrupt.h>
19 #include <linux/slab.h>
20 #include <linux/init.h>
23 #include <asm/ptrace.h>
24 #include <asm/processor.h>
25 #include <asm/system.h>
27 #include <asm/vaddrs.h>
28 #include <asm/timer.h>
29 #include <asm/openprom.h>
30 #include <asm/oplib.h>
31 #include <asm/traps.h>
34 #include <asm/sun4paddr.h>
35 #include <asm/idprom.h>
36 #include <asm/machines.h>
40 static struct resource sun4c_timer_eb = { "sun4c_timer" };
41 static struct resource sun4c_intr_eb = { "sun4c_intr" };
45 * Bit field defines for the interrupt registers on various
49 /* The sun4c interrupt register. */
50 #define SUN4C_INT_ENABLE 0x01 /* Allow interrupts. */
51 #define SUN4C_INT_E14 0x80 /* Enable level 14 IRQ. */
52 #define SUN4C_INT_E10 0x20 /* Enable level 10 IRQ. */
53 #define SUN4C_INT_E8 0x10 /* Enable level 8 IRQ. */
54 #define SUN4C_INT_E6 0x08 /* Enable level 6 IRQ. */
55 #define SUN4C_INT_E4 0x04 /* Enable level 4 IRQ. */
56 #define SUN4C_INT_E1 0x02 /* Enable level 1 IRQ. */
58 /* Pointer to the interrupt enable byte
60 * Dave Redman (djhr@tadpole.co.uk)
61 * What you may not be aware of is that entry.S requires this variable.
63 * --- linux_trap_nmi_sun4c --
65 * so don't go making it static, like I tried. sigh.
67 unsigned char *interrupt_enable = NULL;
69 static int sun4c_pil_map[] = { 0, 1, 2, 3, 5, 7, 8, 9 };
71 static unsigned int sun4c_sbint_to_irq(struct sbus_dev *sdev,
74 if (sbint >= sizeof(sun4c_pil_map)) {
75 printk(KERN_ERR "%s: bogus SBINT %d\n", sdev->prom_name, sbint);
78 return sun4c_pil_map[sbint];
81 static void sun4c_disable_irq(unsigned int irq_nr)
84 unsigned char current_mask, new_mask;
86 local_irq_save(flags);
87 irq_nr &= (NR_IRQS - 1);
88 current_mask = *interrupt_enable;
91 new_mask = ((current_mask) & (~(SUN4C_INT_E1)));
94 new_mask = ((current_mask) & (~(SUN4C_INT_E8)));
97 new_mask = ((current_mask) & (~(SUN4C_INT_E10)));
100 new_mask = ((current_mask) & (~(SUN4C_INT_E14)));
103 local_irq_restore(flags);
106 *interrupt_enable = new_mask;
107 local_irq_restore(flags);
110 static void sun4c_enable_irq(unsigned int irq_nr)
113 unsigned char current_mask, new_mask;
115 local_irq_save(flags);
116 irq_nr &= (NR_IRQS - 1);
117 current_mask = *interrupt_enable;
120 new_mask = ((current_mask) | SUN4C_INT_E1);
123 new_mask = ((current_mask) | SUN4C_INT_E8);
126 new_mask = ((current_mask) | SUN4C_INT_E10);
129 new_mask = ((current_mask) | SUN4C_INT_E14);
132 local_irq_restore(flags);
135 *interrupt_enable = new_mask;
136 local_irq_restore(flags);
139 #define TIMER_IRQ 10 /* Also at level 14, but we ignore that one. */
140 #define PROFILE_IRQ 14 /* Level14 ticker.. used by OBP for polling */
142 volatile struct sun4c_timer_info *sun4c_timers;
145 /* This is an ugly hack to work around the
146 current timer code, and make it work with
147 the sun4/260 intersil
149 volatile struct sun4c_timer_info sun4_timer;
152 static void sun4c_clear_clock_irq(void)
154 volatile unsigned int clear_intr;
156 if (idprom->id_machtype == (SM_SUN4 | SM_4_260))
157 clear_intr = sun4_timer.timer_limit10;
160 clear_intr = sun4c_timers->timer_limit10;
163 static void sun4c_clear_profile_irq(int cpu)
165 /* Errm.. not sure how to do this.. */
168 static void sun4c_load_profile_irq(int cpu, unsigned int limit)
170 /* Errm.. not sure how to do this.. */
173 static void __init sun4c_init_timers(irq_handler_t counter_fn)
177 /* Map the Timer chip, this is implemented in hardware inside
178 * the cache chip on the sun4c.
181 if (idprom->id_machtype == (SM_SUN4 | SM_4_260))
182 sun4c_timers = &sun4_timer;
185 sun4c_timers = ioremap(SUN_TIMER_PHYSADDR,
186 sizeof(struct sun4c_timer_info));
188 /* Have the level 10 timer tick at 100HZ. We don't touch the
189 * level 14 timer limit since we are letting the prom handle
190 * them until we have a real console driver so L1-A works.
192 sun4c_timers->timer_limit10 = (((1000000/HZ) + 1) << 10);
193 master_l10_counter = &sun4c_timers->cur_count10;
194 master_l10_limit = &sun4c_timers->timer_limit10;
196 irq = request_irq(TIMER_IRQ,
198 (IRQF_DISABLED | SA_STATIC_ALLOC),
201 prom_printf("time_init: unable to attach IRQ%d\n",TIMER_IRQ);
206 /* This does not work on 4/330 */
207 sun4c_enable_irq(10);
209 claim_ticker14(NULL, PROFILE_IRQ, 0);
213 static void sun4c_nop(void) {}
216 void __init sun4c_init_IRQ(void)
218 struct linux_prom_registers int_regs[2];
222 interrupt_enable = (char *)
223 ioremap(sun4_ie_physaddr, PAGE_SIZE);
225 struct resource phyres;
227 ie_node = prom_searchsiblings (prom_getchild(prom_root_node),
230 panic("Cannot find /interrupt-enable node");
232 /* Depending on the "address" property is bad news... */
233 interrupt_enable = NULL;
234 if (prom_getproperty(ie_node, "reg", (char *) int_regs,
235 sizeof(int_regs)) != -1) {
236 memset(&phyres, 0, sizeof(struct resource));
237 phyres.flags = int_regs[0].which_io;
238 phyres.start = int_regs[0].phys_addr;
239 interrupt_enable = (char *) sbus_ioremap(&phyres, 0,
240 int_regs[0].reg_size, "sun4c_intr");
243 if (!interrupt_enable)
244 panic("Cannot map interrupt_enable");
246 BTFIXUPSET_CALL(sbint_to_irq, sun4c_sbint_to_irq, BTFIXUPCALL_NORM);
247 BTFIXUPSET_CALL(enable_irq, sun4c_enable_irq, BTFIXUPCALL_NORM);
248 BTFIXUPSET_CALL(disable_irq, sun4c_disable_irq, BTFIXUPCALL_NORM);
249 BTFIXUPSET_CALL(enable_pil_irq, sun4c_enable_irq, BTFIXUPCALL_NORM);
250 BTFIXUPSET_CALL(disable_pil_irq, sun4c_disable_irq, BTFIXUPCALL_NORM);
251 BTFIXUPSET_CALL(clear_clock_irq, sun4c_clear_clock_irq, BTFIXUPCALL_NORM);
252 BTFIXUPSET_CALL(clear_profile_irq, sun4c_clear_profile_irq, BTFIXUPCALL_NOP);
253 BTFIXUPSET_CALL(load_profile_irq, sun4c_load_profile_irq, BTFIXUPCALL_NOP);
254 sparc_init_timers = sun4c_init_timers;
256 BTFIXUPSET_CALL(set_cpu_int, sun4c_nop, BTFIXUPCALL_NOP);
257 BTFIXUPSET_CALL(clear_cpu_int, sun4c_nop, BTFIXUPCALL_NOP);
258 BTFIXUPSET_CALL(set_irq_udt, sun4c_nop, BTFIXUPCALL_NOP);
260 *interrupt_enable = (SUN4C_INT_ENABLE);
261 /* Cannot enable interrupts until OBP ticker is disabled. */