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>
22 #include <asm/ptrace.h>
23 #include <asm/processor.h>
24 #include <asm/system.h>
26 #include <asm/vaddrs.h>
27 #include <asm/timer.h>
28 #include <asm/openprom.h>
29 #include <asm/oplib.h>
30 #include <asm/traps.h>
33 #include <asm/sun4paddr.h>
34 #include <asm/idprom.h>
35 #include <asm/machines.h>
39 static struct resource sun4c_timer_eb = { "sun4c_timer" };
40 static struct resource sun4c_intr_eb = { "sun4c_intr" };
43 /* Pointer to the interrupt enable byte
45 * Dave Redman (djhr@tadpole.co.uk)
46 * What you may not be aware of is that entry.S requires this variable.
48 * --- linux_trap_nmi_sun4c --
50 * so don't go making it static, like I tried. sigh.
52 unsigned char *interrupt_enable = NULL;
54 static int sun4c_pil_map[] = { 0, 1, 2, 3, 5, 7, 8, 9 };
56 unsigned int sun4c_sbint_to_irq(struct sbus_dev *sdev, unsigned int sbint)
58 if (sbint >= sizeof(sun4c_pil_map)) {
59 printk(KERN_ERR "%s: bogus SBINT %d\n", sdev->prom_name, sbint);
62 return sun4c_pil_map[sbint];
65 static void sun4c_disable_irq(unsigned int irq_nr)
68 unsigned char current_mask, new_mask;
70 local_irq_save(flags);
71 irq_nr &= (NR_IRQS - 1);
72 current_mask = *interrupt_enable;
75 new_mask = ((current_mask) & (~(SUN4C_INT_E1)));
78 new_mask = ((current_mask) & (~(SUN4C_INT_E8)));
81 new_mask = ((current_mask) & (~(SUN4C_INT_E10)));
84 new_mask = ((current_mask) & (~(SUN4C_INT_E14)));
87 local_irq_restore(flags);
90 *interrupt_enable = new_mask;
91 local_irq_restore(flags);
94 static void sun4c_enable_irq(unsigned int irq_nr)
97 unsigned char current_mask, new_mask;
99 local_irq_save(flags);
100 irq_nr &= (NR_IRQS - 1);
101 current_mask = *interrupt_enable;
104 new_mask = ((current_mask) | SUN4C_INT_E1);
107 new_mask = ((current_mask) | SUN4C_INT_E8);
110 new_mask = ((current_mask) | SUN4C_INT_E10);
113 new_mask = ((current_mask) | SUN4C_INT_E14);
116 local_irq_restore(flags);
119 *interrupt_enable = new_mask;
120 local_irq_restore(flags);
123 #define TIMER_IRQ 10 /* Also at level 14, but we ignore that one. */
124 #define PROFILE_IRQ 14 /* Level14 ticker.. used by OBP for polling */
126 volatile struct sun4c_timer_info *sun4c_timers;
129 /* This is an ugly hack to work around the
130 current timer code, and make it work with
131 the sun4/260 intersil
133 volatile struct sun4c_timer_info sun4_timer;
136 static void sun4c_clear_clock_irq(void)
138 volatile unsigned int clear_intr;
140 if (idprom->id_machtype == (SM_SUN4 | SM_4_260))
141 clear_intr = sun4_timer.timer_limit10;
144 clear_intr = sun4c_timers->timer_limit10;
147 static void sun4c_clear_profile_irq(int cpu)
149 /* Errm.. not sure how to do this.. */
152 static void sun4c_load_profile_irq(int cpu, unsigned int limit)
154 /* Errm.. not sure how to do this.. */
157 static void __init sun4c_init_timers(irq_handler_t counter_fn)
161 /* Map the Timer chip, this is implemented in hardware inside
162 * the cache chip on the sun4c.
165 if (idprom->id_machtype == (SM_SUN4 | SM_4_260))
166 sun4c_timers = &sun4_timer;
169 sun4c_timers = ioremap(SUN_TIMER_PHYSADDR,
170 sizeof(struct sun4c_timer_info));
172 /* Have the level 10 timer tick at 100HZ. We don't touch the
173 * level 14 timer limit since we are letting the prom handle
174 * them until we have a real console driver so L1-A works.
176 sun4c_timers->timer_limit10 = (((1000000/HZ) + 1) << 10);
177 master_l10_counter = &sun4c_timers->cur_count10;
178 master_l10_limit = &sun4c_timers->timer_limit10;
180 irq = request_irq(TIMER_IRQ,
182 (IRQF_DISABLED | SA_STATIC_ALLOC),
185 prom_printf("time_init: unable to attach IRQ%d\n",TIMER_IRQ);
190 /* This does not work on 4/330 */
191 sun4c_enable_irq(10);
193 claim_ticker14(NULL, PROFILE_IRQ, 0);
197 static void sun4c_nop(void) {}
200 void __init sun4c_init_IRQ(void)
202 struct linux_prom_registers int_regs[2];
206 interrupt_enable = (char *)
207 ioremap(sun4_ie_physaddr, PAGE_SIZE);
209 struct resource phyres;
211 ie_node = prom_searchsiblings (prom_getchild(prom_root_node),
214 panic("Cannot find /interrupt-enable node");
216 /* Depending on the "address" property is bad news... */
217 interrupt_enable = NULL;
218 if (prom_getproperty(ie_node, "reg", (char *) int_regs,
219 sizeof(int_regs)) != -1) {
220 memset(&phyres, 0, sizeof(struct resource));
221 phyres.flags = int_regs[0].which_io;
222 phyres.start = int_regs[0].phys_addr;
223 interrupt_enable = (char *) sbus_ioremap(&phyres, 0,
224 int_regs[0].reg_size, "sun4c_intr");
227 if (!interrupt_enable)
228 panic("Cannot map interrupt_enable");
230 BTFIXUPSET_CALL(sbint_to_irq, sun4c_sbint_to_irq, BTFIXUPCALL_NORM);
231 BTFIXUPSET_CALL(enable_irq, sun4c_enable_irq, BTFIXUPCALL_NORM);
232 BTFIXUPSET_CALL(disable_irq, sun4c_disable_irq, BTFIXUPCALL_NORM);
233 BTFIXUPSET_CALL(enable_pil_irq, sun4c_enable_irq, BTFIXUPCALL_NORM);
234 BTFIXUPSET_CALL(disable_pil_irq, sun4c_disable_irq, BTFIXUPCALL_NORM);
235 BTFIXUPSET_CALL(clear_clock_irq, sun4c_clear_clock_irq, BTFIXUPCALL_NORM);
236 BTFIXUPSET_CALL(clear_profile_irq, sun4c_clear_profile_irq, BTFIXUPCALL_NOP);
237 BTFIXUPSET_CALL(load_profile_irq, sun4c_load_profile_irq, BTFIXUPCALL_NOP);
238 sparc_init_timers = sun4c_init_timers;
240 BTFIXUPSET_CALL(set_cpu_int, sun4c_nop, BTFIXUPCALL_NOP);
241 BTFIXUPSET_CALL(clear_cpu_int, sun4c_nop, BTFIXUPCALL_NOP);
242 BTFIXUPSET_CALL(set_irq_udt, sun4c_nop, BTFIXUPCALL_NOP);
244 *interrupt_enable = (SUN4C_INT_ENABLE);
245 /* Cannot enable interrupts until OBP ticker is disabled. */