2 * (C) Copyright 2000-2002 Wolfgang Denk, DENX Software Engineering, wd@denx.de.
3 * (C) Copyright 2003 Martin Winistoerfer, martinwinistoerfer@gmx.ch.
5 * See file CREDITS for list of people who contributed to this
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of
11 * the License, or (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
26 * Discription: Contains interrupt routines needed by U-Boot
33 #include <asm/processor.h>
35 /************************************************************************/
37 unsigned decrementer_count; /* count value for 1e6/HZ microseconds */
39 /************************************************************************/
41 struct interrupt_action {
42 interrupt_handler_t *handler;
46 static struct interrupt_action irq_vecs[NR_IRQS];
49 * Local function prototypes
51 static __inline__ unsigned long get_msr (void)
55 asm volatile ("mfmsr %0":"=r" (msr):);
60 static __inline__ void set_msr (unsigned long msr)
62 asm volatile ("mtmsr %0"::"r" (msr));
65 static __inline__ unsigned long get_dec (void)
69 asm volatile ("mfdec %0":"=r" (val):);
75 static __inline__ void set_dec (unsigned long val)
77 asm volatile ("mtdec %0"::"r" (val));
83 void enable_interrupts (void)
85 set_msr (get_msr () | MSR_EE);
89 * Returns flag if MSR_EE was set before
91 int disable_interrupts (void)
93 ulong msr = get_msr ();
95 set_msr (msr & ~MSR_EE);
96 return ((msr & MSR_EE) != 0);
100 * Initialise interrupts
103 int interrupt_init (void)
105 volatile immap_t *immr = (immap_t *) CFG_IMMR;
107 /* Decrementer used here for status led */
108 decrementer_count = get_tbclk () / CFG_HZ;
110 /* Disable all interrupts */
111 immr->im_siu_conf.sc_simask = 0;
113 set_dec (decrementer_count);
115 set_msr (get_msr () | MSR_EE);
120 * Handle external interrupts
122 void external_interrupt (struct pt_regs *regs)
124 volatile immap_t *immr = (immap_t *) CFG_IMMR;
126 ulong simask, newmask;
130 * read the SIVEC register and shift the bits down
131 * to get the irq number
133 vec = immr->im_siu_conf.sc_sivec;
135 v_bit = 0x80000000UL >> irq;
138 * Read Interrupt Mask Register and Mask Interrupts
140 simask = immr->im_siu_conf.sc_simask;
141 newmask = simask & (~(0xFFFF0000 >> irq));
142 immr->im_siu_conf.sc_simask = newmask;
144 if (!(irq & 0x1)) { /* External Interrupt ? */
148 * Read Interrupt Edge/Level Register
150 siel = immr->im_siu_conf.sc_siel;
152 if (siel & v_bit) { /* edge triggered interrupt ? */
154 * Rewrite SIPEND Register to clear interrupt
156 immr->im_siu_conf.sc_sipend = v_bit;
160 if (irq_vecs[irq].handler != NULL) {
161 irq_vecs[irq].handler (irq_vecs[irq].arg);
163 printf ("\nBogus External Interrupt IRQ %d Vector %ld\n",
165 /* turn off the bogus interrupt to avoid it from now */
169 * Re-Enable old Interrupt Mask
171 immr->im_siu_conf.sc_simask = simask;
175 * Install and free an interrupt handler
177 void irq_install_handler (int vec, interrupt_handler_t * handler,
180 volatile immap_t *immr = (immap_t *) CFG_IMMR;
182 if (irq_vecs[vec].handler != NULL) {
183 printf ("SIU interrupt %d 0x%x\n",
187 irq_vecs[vec].handler = handler;
188 irq_vecs[vec].arg = arg;
189 immr->im_siu_conf.sc_simask |= 1 << (31 - vec);
191 printf ("Install SIU interrupt for vector %d ==> %p\n",
196 void irq_free_handler (int vec)
198 volatile immap_t *immr = (immap_t *) CFG_IMMR;
201 printf ("Free CPM interrupt for vector %d\n",
204 immr->im_siu_conf.sc_simask &= ~(1 << (31 - vec));
205 irq_vecs[vec].handler = NULL;
206 irq_vecs[vec].arg = NULL;
209 volatile ulong timestamp = 0;
212 * Timer interrupt - gets called when bit 0 of DEC changes from
213 * 0. Decrementer is enabled with bit TBE in TBSCR.
215 void timer_interrupt (struct pt_regs *regs)
217 volatile immap_t *immr = (immap_t *) CFG_IMMR;
219 #ifdef CONFIG_STATUS_LED
220 extern void status_led_tick (ulong);
223 printf ("*** Timer Interrupt *** ");
225 /* Reset Timer Status Bit and Timers Interrupt Status */
226 immr->im_clkrstk.cark_plprcrk = KAPWR_KEY;
228 immr->im_clkrst.car_plprcr |= PLPRCR_TEXPS | PLPRCR_TMIST;
230 /* Restore Decrementer Count */
231 set_dec (decrementer_count);
235 #ifdef CONFIG_STATUS_LED
236 status_led_tick (timestamp);
237 #endif /* CONFIG_STATUS_LED */
239 #if defined(CONFIG_WATCHDOG)
241 * The shortest watchdog period of all boards
242 * is approx. 1 sec, thus re-trigger watchdog at least
243 * every 500 ms = CFG_HZ / 2
245 if ((timestamp % (CFG_HZ / 2)) == 0) {
246 reset_5xx_watchdog (immr);
248 #endif /* CONFIG_WATCHDOG */
254 void reset_timer (void)
262 ulong get_timer (ulong base)
264 return (timestamp - base);
270 void set_timer (ulong t)