2 * linux/arch/$(ARCH)/platform/$(PLATFORM)/ints.c
4 * This file is subject to the terms and conditions of the GNU General Public
5 * License. See the file COPYING in the main directory of this archive
8 * Copyright (c) 2000 Michael Leslie <mleslie@lineo.com>
9 * Copyright (c) 1996 Roman Zippel
10 * Copyright (c) 1999 D. Jeff Dionne <jeff@uclinux.org>
13 #include <linux/config.h>
14 #include <linux/module.h>
15 #include <linux/types.h>
16 #include <linux/kernel.h>
17 #include <linux/sched.h>
18 #include <linux/kernel_stat.h>
19 #include <linux/errno.h>
21 #include <asm/system.h>
23 #include <asm/irqnode.h>
24 #include <asm/traps.h>
26 #include <asm/machdep.h>
27 #include <asm/setup.h>
28 #include <asm/m68360.h>
30 /* from quicc/commproc.c: */
32 extern void cpm_interrupt_init(void);
34 #define INTERNAL_IRQS (96)
36 /* assembler routines */
37 asmlinkage void system_call(void);
38 asmlinkage void buserr(void);
39 asmlinkage void trap(void);
40 asmlinkage irqreturn_t bad_interrupt(void);
41 asmlinkage irqreturn_t inthandler(void);
43 extern void *_ramvec[];
45 /* The number of spurious interrupts */
46 volatile unsigned int num_spurious;
47 unsigned int local_irq_count[NR_CPUS];
49 /* irq node variables for the 32 (potential) on chip sources */
50 static irq_node_t int_irq_list[INTERNAL_IRQS];
52 static short int_irq_ablecount[INTERNAL_IRQS];
55 * This function should be called during kernel startup to initialize
56 * IRQ handling routines.
62 int vba = (CPM_VECTOR_BASE<<4);
64 /* set up the vectors */
80 _ramvec[32] = system_call;
86 /* set up CICR for vector base address and irq level */
87 /* irl = 4, hp = 1f - see MC68360UM p 7-377 */
88 pquicc->intr_cicr = 0x00e49f00 | vba;
90 /* CPM interrupt vectors: (p 7-376) */
91 _ramvec[vba+CPMVEC_ERROR] = bad_interrupt; /* Error */
92 _ramvec[vba+CPMVEC_PIO_PC11] = inthandler; /* pio - pc11 */
93 _ramvec[vba+CPMVEC_PIO_PC10] = inthandler; /* pio - pc10 */
94 _ramvec[vba+CPMVEC_SMC2] = inthandler; /* smc2/pip */
95 _ramvec[vba+CPMVEC_SMC1] = inthandler; /* smc1 */
96 _ramvec[vba+CPMVEC_SPI] = inthandler; /* spi */
97 _ramvec[vba+CPMVEC_PIO_PC9] = inthandler; /* pio - pc9 */
98 _ramvec[vba+CPMVEC_TIMER4] = inthandler; /* timer 4 */
99 _ramvec[vba+CPMVEC_RESERVED1] = inthandler; /* reserved */
100 _ramvec[vba+CPMVEC_PIO_PC8] = inthandler; /* pio - pc8 */
101 _ramvec[vba+CPMVEC_PIO_PC7] = inthandler; /* pio - pc7 */
102 _ramvec[vba+CPMVEC_PIO_PC6] = inthandler; /* pio - pc6 */
103 _ramvec[vba+CPMVEC_TIMER3] = inthandler; /* timer 3 */
104 _ramvec[vba+CPMVEC_RISCTIMER] = inthandler; /* reserved */
105 _ramvec[vba+CPMVEC_PIO_PC5] = inthandler; /* pio - pc5 */
106 _ramvec[vba+CPMVEC_PIO_PC4] = inthandler; /* pio - pc4 */
107 _ramvec[vba+CPMVEC_RESERVED2] = inthandler; /* reserved */
108 _ramvec[vba+CPMVEC_RISCTIMER] = inthandler; /* timer table */
109 _ramvec[vba+CPMVEC_TIMER2] = inthandler; /* timer 2 */
110 _ramvec[vba+CPMVEC_RESERVED3] = inthandler; /* reserved */
111 _ramvec[vba+CPMVEC_IDMA2] = inthandler; /* idma 2 */
112 _ramvec[vba+CPMVEC_IDMA1] = inthandler; /* idma 1 */
113 _ramvec[vba+CPMVEC_SDMA_CB_ERR] = inthandler; /* sdma channel bus error */
114 _ramvec[vba+CPMVEC_PIO_PC3] = inthandler; /* pio - pc3 */
115 _ramvec[vba+CPMVEC_PIO_PC2] = inthandler; /* pio - pc2 */
116 /* _ramvec[vba+CPMVEC_TIMER1] = cpm_isr_timer1; */ /* timer 1 */
117 _ramvec[vba+CPMVEC_TIMER1] = inthandler; /* timer 1 */
118 _ramvec[vba+CPMVEC_PIO_PC1] = inthandler; /* pio - pc1 */
119 _ramvec[vba+CPMVEC_SCC4] = inthandler; /* scc 4 */
120 _ramvec[vba+CPMVEC_SCC3] = inthandler; /* scc 3 */
121 _ramvec[vba+CPMVEC_SCC2] = inthandler; /* scc 2 */
122 _ramvec[vba+CPMVEC_SCC1] = inthandler; /* scc 1 */
123 _ramvec[vba+CPMVEC_PIO_PC0] = inthandler; /* pio - pc0 */
126 /* turn off all CPM interrupts */
127 pquicc->intr_cimr = 0x00000000;
129 /* initialize handlers */
130 for (i = 0; i < INTERNAL_IRQS; i++) {
131 int_irq_list[i].handler = NULL;
132 int_irq_list[i].flags = IRQ_FLG_STD;
133 int_irq_list[i].dev_id = NULL;
134 int_irq_list[i].devname = NULL;
139 void M68360_insert_irq(irq_node_t **list, irq_node_t *node)
145 printk(KERN_INFO "%s: Warning: dev_id of %s is zero\n",
146 __FUNCTION__, node->devname);
148 local_irq_save(flags);
160 local_irq_restore(flags);
163 void M68360_delete_irq(irq_node_t **list, void *dev_id)
168 local_irq_save(flags);
170 for (node = *list; node; list = &node->next, node = *list) {
171 if (node->dev_id == dev_id) {
173 /* Mark it as free. */
174 node->handler = NULL;
175 local_irq_restore(flags);
179 local_irq_restore(flags);
180 printk (KERN_INFO "%s: tried to remove invalid irq\n", __FUNCTION__);
186 irqreturn_t (*handler)(int, void *, struct pt_regs *),
193 irq += (CPM_VECTOR_BASE<<4);
195 if (irq >= INTERNAL_IRQS) {
196 printk (KERN_ERR "%s: Unknown IRQ %d from %s\n", __FUNCTION__, irq, devname);
200 if (!(int_irq_list[irq].flags & IRQ_FLG_STD)) {
201 if (int_irq_list[irq].flags & IRQ_FLG_LOCK) {
202 printk(KERN_ERR "%s: IRQ %d from %s is not replaceable\n",
203 __FUNCTION__, irq, int_irq_list[irq].devname);
206 if (flags & IRQ_FLG_REPLACE) {
207 printk(KERN_ERR "%s: %s can't replace IRQ %d from %s\n",
208 __FUNCTION__, devname, irq, int_irq_list[irq].devname);
212 int_irq_list[irq].handler = handler;
213 int_irq_list[irq].flags = flags;
214 int_irq_list[irq].dev_id = dev_id;
215 int_irq_list[irq].devname = devname;
217 /* enable in the CIMR */
218 if (!int_irq_ablecount[irq])
219 pquicc->intr_cimr |= mask;
220 /* *(volatile unsigned long *)0xfffff304 &= ~(1<<irq); */
225 EXPORT_SYMBOL(request_irq);
227 void free_irq(unsigned int irq, void *dev_id)
229 if (irq >= INTERNAL_IRQS) {
230 printk (KERN_ERR "%s: Unknown IRQ %d\n", __FUNCTION__, irq);
234 if (int_irq_list[irq].dev_id != dev_id)
235 printk(KERN_INFO "%s: removing probably wrong IRQ %d from %s\n",
236 __FUNCTION__, irq, int_irq_list[irq].devname);
237 int_irq_list[irq].handler = NULL;
238 int_irq_list[irq].flags = IRQ_FLG_STD;
239 int_irq_list[irq].dev_id = NULL;
240 int_irq_list[irq].devname = NULL;
242 *(volatile unsigned long *)0xfffff304 |= 1<<irq;
245 EXPORT_SYMBOL(free_irq);
249 * Enable/disable a particular machine specific interrupt source.
250 * Note that this may affect other interrupts in case of a shared interrupt.
251 * This function should only be called for a _very_ short time to change some
252 * internal data, that may not be changed by the interrupt at the same time.
253 * int_(enable|disable)_irq calls may also be nested.
255 void M68360_enable_irq(unsigned int irq)
257 if (irq >= INTERNAL_IRQS) {
258 printk(KERN_ERR "%s: Unknown IRQ %d\n", __FUNCTION__, irq);
262 if (--int_irq_ablecount[irq])
265 /* enable the interrupt */
266 *(volatile unsigned long *)0xfffff304 &= ~(1<<irq);
269 void M68360_disable_irq(unsigned int irq)
271 if (irq >= INTERNAL_IRQS) {
272 printk(KERN_ERR "%s: Unknown IRQ %d\n", __FUNCTION__, irq);
276 if (int_irq_ablecount[irq]++)
279 /* disable the interrupt */
280 *(volatile unsigned long *)0xfffff304 |= 1<<irq;
284 int show_interrupts(struct seq_file *p, void *v)
286 int i = *(loff_t *) v;
289 if (int_irq_list[i].devname) {
290 seq_printf(p, "%3d: %10u ", i, kstat_cpu(0).irqs[i]);
291 if (int_irq_list[i].flags & IRQ_FLG_LOCK)
295 seq_printf(p, "%s\n", int_irq_list[i].devname);
299 seq_printf(p, " : %10u spurious\n", num_spurious);
304 /* The 68k family did not have a good way to determine the source
305 * of interrupts until later in the family. The EC000 core does
306 * not provide the vector number on the stack, we vector everything
307 * into one vector and look in the blasted mask register...
308 * This code is designed to be fast, almost constant time, not clean!
310 void process_int(int vec, struct pt_regs *fp)
315 /* unsigned long pend = *(volatile unsigned long *)0xfffff30c; */
317 /* irq = vec + (CPM_VECTOR_BASE<<4); */
320 /* unsigned long pend = *(volatile unsigned long *)pquicc->intr_cipr; */
322 /* Bugger all that weirdness. For the moment, I seem to know where I came from;
323 * vec is passed from a specific ISR, so I'll use it. */
325 if (int_irq_list[irq].handler) {
326 int_irq_list[irq].handler(irq , int_irq_list[irq].dev_id, fp);
327 kstat_cpu(0).irqs[irq]++;
328 pquicc->intr_cisr = (1 << vec); /* indicate that irq has been serviced */
330 printk(KERN_ERR "unregistered interrupt %d!\nTurning it off in the CIMR...\n", irq);
331 /* *(volatile unsigned long *)0xfffff304 |= mask; */
332 pquicc->intr_cimr &= ~(1 << vec);