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 unsigned int sun4c_sbint_to_irq(struct sbus_dev *sdev, unsigned int sbint)
73 if (sbint >= sizeof(sun4c_pil_map)) {
74 printk(KERN_ERR "%s: bogus SBINT %d\n", sdev->prom_name, sbint);
77 return sun4c_pil_map[sbint];
80 static void sun4c_disable_irq(unsigned int irq_nr)
83 unsigned char current_mask, new_mask;
85 local_irq_save(flags);
86 irq_nr &= (NR_IRQS - 1);
87 current_mask = *interrupt_enable;
90 new_mask = ((current_mask) & (~(SUN4C_INT_E1)));
93 new_mask = ((current_mask) & (~(SUN4C_INT_E8)));
96 new_mask = ((current_mask) & (~(SUN4C_INT_E10)));
99 new_mask = ((current_mask) & (~(SUN4C_INT_E14)));
102 local_irq_restore(flags);
105 *interrupt_enable = new_mask;
106 local_irq_restore(flags);
109 static void sun4c_enable_irq(unsigned int irq_nr)
112 unsigned char current_mask, new_mask;
114 local_irq_save(flags);
115 irq_nr &= (NR_IRQS - 1);
116 current_mask = *interrupt_enable;
119 new_mask = ((current_mask) | SUN4C_INT_E1);
122 new_mask = ((current_mask) | SUN4C_INT_E8);
125 new_mask = ((current_mask) | SUN4C_INT_E10);
128 new_mask = ((current_mask) | SUN4C_INT_E14);
131 local_irq_restore(flags);
134 *interrupt_enable = new_mask;
135 local_irq_restore(flags);
138 #define TIMER_IRQ 10 /* Also at level 14, but we ignore that one. */
139 #define PROFILE_IRQ 14 /* Level14 ticker.. used by OBP for polling */
141 volatile struct sun4c_timer_info *sun4c_timers;
144 /* This is an ugly hack to work around the
145 current timer code, and make it work with
146 the sun4/260 intersil
148 volatile struct sun4c_timer_info sun4_timer;
151 static void sun4c_clear_clock_irq(void)
153 volatile unsigned int clear_intr;
155 if (idprom->id_machtype == (SM_SUN4 | SM_4_260))
156 clear_intr = sun4_timer.timer_limit10;
159 clear_intr = sun4c_timers->timer_limit10;
162 static void sun4c_clear_profile_irq(int cpu)
164 /* Errm.. not sure how to do this.. */
167 static void sun4c_load_profile_irq(int cpu, unsigned int limit)
169 /* Errm.. not sure how to do this.. */
172 static void __init sun4c_init_timers(irq_handler_t counter_fn)
176 /* Map the Timer chip, this is implemented in hardware inside
177 * the cache chip on the sun4c.
180 if (idprom->id_machtype == (SM_SUN4 | SM_4_260))
181 sun4c_timers = &sun4_timer;
184 sun4c_timers = ioremap(SUN_TIMER_PHYSADDR,
185 sizeof(struct sun4c_timer_info));
187 /* Have the level 10 timer tick at 100HZ. We don't touch the
188 * level 14 timer limit since we are letting the prom handle
189 * them until we have a real console driver so L1-A works.
191 sun4c_timers->timer_limit10 = (((1000000/HZ) + 1) << 10);
192 master_l10_counter = &sun4c_timers->cur_count10;
193 master_l10_limit = &sun4c_timers->timer_limit10;
195 irq = request_irq(TIMER_IRQ,
197 (IRQF_DISABLED | SA_STATIC_ALLOC),
200 prom_printf("time_init: unable to attach IRQ%d\n",TIMER_IRQ);
205 /* This does not work on 4/330 */
206 sun4c_enable_irq(10);
208 claim_ticker14(NULL, PROFILE_IRQ, 0);
212 static void sun4c_nop(void) {}
215 void __init sun4c_init_IRQ(void)
217 struct linux_prom_registers int_regs[2];
221 interrupt_enable = (char *)
222 ioremap(sun4_ie_physaddr, PAGE_SIZE);
224 struct resource phyres;
226 ie_node = prom_searchsiblings (prom_getchild(prom_root_node),
229 panic("Cannot find /interrupt-enable node");
231 /* Depending on the "address" property is bad news... */
232 interrupt_enable = NULL;
233 if (prom_getproperty(ie_node, "reg", (char *) int_regs,
234 sizeof(int_regs)) != -1) {
235 memset(&phyres, 0, sizeof(struct resource));
236 phyres.flags = int_regs[0].which_io;
237 phyres.start = int_regs[0].phys_addr;
238 interrupt_enable = (char *) sbus_ioremap(&phyres, 0,
239 int_regs[0].reg_size, "sun4c_intr");
242 if (!interrupt_enable)
243 panic("Cannot map interrupt_enable");
245 BTFIXUPSET_CALL(sbint_to_irq, sun4c_sbint_to_irq, BTFIXUPCALL_NORM);
246 BTFIXUPSET_CALL(enable_irq, sun4c_enable_irq, BTFIXUPCALL_NORM);
247 BTFIXUPSET_CALL(disable_irq, sun4c_disable_irq, BTFIXUPCALL_NORM);
248 BTFIXUPSET_CALL(enable_pil_irq, sun4c_enable_irq, BTFIXUPCALL_NORM);
249 BTFIXUPSET_CALL(disable_pil_irq, sun4c_disable_irq, BTFIXUPCALL_NORM);
250 BTFIXUPSET_CALL(clear_clock_irq, sun4c_clear_clock_irq, BTFIXUPCALL_NORM);
251 BTFIXUPSET_CALL(clear_profile_irq, sun4c_clear_profile_irq, BTFIXUPCALL_NOP);
252 BTFIXUPSET_CALL(load_profile_irq, sun4c_load_profile_irq, BTFIXUPCALL_NOP);
253 sparc_init_timers = sun4c_init_timers;
255 BTFIXUPSET_CALL(set_cpu_int, sun4c_nop, BTFIXUPCALL_NOP);
256 BTFIXUPSET_CALL(clear_cpu_int, sun4c_nop, BTFIXUPCALL_NOP);
257 BTFIXUPSET_CALL(set_irq_udt, sun4c_nop, BTFIXUPCALL_NOP);
259 *interrupt_enable = (SUN4C_INT_ENABLE);
260 /* Cannot enable interrupts until OBP ticker is disabled. */