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/config.h>
13 #include <linux/errno.h>
14 #include <linux/linkage.h>
15 #include <linux/kernel_stat.h>
16 #include <linux/signal.h>
17 #include <linux/sched.h>
18 #include <linux/ptrace.h>
19 #include <linux/interrupt.h>
20 #include <linux/slab.h>
21 #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" };
44 /* Pointer to the interrupt enable byte
46 * Dave Redman (djhr@tadpole.co.uk)
47 * What you may not be aware of is that entry.S requires this variable.
49 * --- linux_trap_nmi_sun4c --
51 * so don't go making it static, like I tried. sigh.
53 unsigned char *interrupt_enable = NULL;
55 static int sun4c_pil_map[] = { 0, 1, 2, 3, 5, 7, 8, 9 };
57 unsigned int sun4c_sbint_to_irq(struct sbus_dev *sdev, unsigned int sbint)
59 if (sbint >= sizeof(sun4c_pil_map)) {
60 printk(KERN_ERR "%s: bogus SBINT %d\n", sdev->prom_name, sbint);
63 return sun4c_pil_map[sbint];
66 static void sun4c_disable_irq(unsigned int irq_nr)
69 unsigned char current_mask, new_mask;
71 local_irq_save(flags);
72 irq_nr &= (NR_IRQS - 1);
73 current_mask = *interrupt_enable;
76 new_mask = ((current_mask) & (~(SUN4C_INT_E1)));
79 new_mask = ((current_mask) & (~(SUN4C_INT_E8)));
82 new_mask = ((current_mask) & (~(SUN4C_INT_E10)));
85 new_mask = ((current_mask) & (~(SUN4C_INT_E14)));
88 local_irq_restore(flags);
91 *interrupt_enable = new_mask;
92 local_irq_restore(flags);
95 static void sun4c_enable_irq(unsigned int irq_nr)
98 unsigned char current_mask, new_mask;
100 local_irq_save(flags);
101 irq_nr &= (NR_IRQS - 1);
102 current_mask = *interrupt_enable;
105 new_mask = ((current_mask) | SUN4C_INT_E1);
108 new_mask = ((current_mask) | SUN4C_INT_E8);
111 new_mask = ((current_mask) | SUN4C_INT_E10);
114 new_mask = ((current_mask) | SUN4C_INT_E14);
117 local_irq_restore(flags);
120 *interrupt_enable = new_mask;
121 local_irq_restore(flags);
124 #define TIMER_IRQ 10 /* Also at level 14, but we ignore that one. */
125 #define PROFILE_IRQ 14 /* Level14 ticker.. used by OBP for polling */
127 volatile struct sun4c_timer_info *sun4c_timers;
130 /* This is an ugly hack to work around the
131 current timer code, and make it work with
132 the sun4/260 intersil
134 volatile struct sun4c_timer_info sun4_timer;
137 static void sun4c_clear_clock_irq(void)
139 volatile unsigned int clear_intr;
141 if (idprom->id_machtype == (SM_SUN4 | SM_4_260))
142 clear_intr = sun4_timer.timer_limit10;
145 clear_intr = sun4c_timers->timer_limit10;
148 static void sun4c_clear_profile_irq(int cpu)
150 /* Errm.. not sure how to do this.. */
153 static void sun4c_load_profile_irq(int cpu, unsigned int limit)
155 /* Errm.. not sure how to do this.. */
158 static void __init sun4c_init_timers(irqreturn_t (*counter_fn)(int, void *, struct pt_regs *))
162 /* Map the Timer chip, this is implemented in hardware inside
163 * the cache chip on the sun4c.
166 if (idprom->id_machtype == (SM_SUN4 | SM_4_260))
167 sun4c_timers = &sun4_timer;
170 sun4c_timers = ioremap(SUN_TIMER_PHYSADDR,
171 sizeof(struct sun4c_timer_info));
173 /* Have the level 10 timer tick at 100HZ. We don't touch the
174 * level 14 timer limit since we are letting the prom handle
175 * them until we have a real console driver so L1-A works.
177 sun4c_timers->timer_limit10 = (((1000000/HZ) + 1) << 10);
178 master_l10_counter = &sun4c_timers->cur_count10;
179 master_l10_limit = &sun4c_timers->timer_limit10;
181 irq = request_irq(TIMER_IRQ,
183 (SA_INTERRUPT | SA_STATIC_ALLOC),
186 prom_printf("time_init: unable to attach IRQ%d\n",TIMER_IRQ);
191 /* This does not work on 4/330 */
192 sun4c_enable_irq(10);
194 claim_ticker14(NULL, PROFILE_IRQ, 0);
198 static void sun4c_nop(void) {}
201 extern char *sun4m_irq_itoa(unsigned int irq);
203 void __init sun4c_init_IRQ(void)
205 struct linux_prom_registers int_regs[2];
209 interrupt_enable = (char *)
210 ioremap(sun4_ie_physaddr, PAGE_SIZE);
212 struct resource phyres;
214 ie_node = prom_searchsiblings (prom_getchild(prom_root_node),
217 panic("Cannot find /interrupt-enable node");
219 /* Depending on the "address" property is bad news... */
220 interrupt_enable = NULL;
221 if (prom_getproperty(ie_node, "reg", (char *) int_regs,
222 sizeof(int_regs)) != -1) {
223 memset(&phyres, 0, sizeof(struct resource));
224 phyres.flags = int_regs[0].which_io;
225 phyres.start = int_regs[0].phys_addr;
226 interrupt_enable = (char *) sbus_ioremap(&phyres, 0,
227 int_regs[0].reg_size, "sun4c_intr");
230 if (!interrupt_enable)
231 panic("Cannot map interrupt_enable");
233 BTFIXUPSET_CALL(sbint_to_irq, sun4c_sbint_to_irq, BTFIXUPCALL_NORM);
234 BTFIXUPSET_CALL(enable_irq, sun4c_enable_irq, BTFIXUPCALL_NORM);
235 BTFIXUPSET_CALL(disable_irq, sun4c_disable_irq, BTFIXUPCALL_NORM);
236 BTFIXUPSET_CALL(enable_pil_irq, sun4c_enable_irq, BTFIXUPCALL_NORM);
237 BTFIXUPSET_CALL(disable_pil_irq, sun4c_disable_irq, BTFIXUPCALL_NORM);
238 BTFIXUPSET_CALL(clear_clock_irq, sun4c_clear_clock_irq, BTFIXUPCALL_NORM);
239 BTFIXUPSET_CALL(clear_profile_irq, sun4c_clear_profile_irq, BTFIXUPCALL_NOP);
240 BTFIXUPSET_CALL(load_profile_irq, sun4c_load_profile_irq, BTFIXUPCALL_NOP);
241 BTFIXUPSET_CALL(__irq_itoa, sun4m_irq_itoa, BTFIXUPCALL_NORM);
242 sparc_init_timers = sun4c_init_timers;
244 BTFIXUPSET_CALL(set_cpu_int, sun4c_nop, BTFIXUPCALL_NOP);
245 BTFIXUPSET_CALL(clear_cpu_int, sun4c_nop, BTFIXUPCALL_NOP);
246 BTFIXUPSET_CALL(set_irq_udt, sun4c_nop, BTFIXUPCALL_NOP);
248 *interrupt_enable = (SUN4C_INT_ENABLE);
249 /* Cannot enable interrupts until OBP ticker is disabled. */