Daniel Hellstrom | 207e695 | 2008-03-28 10:00:33 +0100 | [diff] [blame] | 1 | /* |
| 2 | * (C) Copyright 2007 |
| 3 | * Daniel Hellstrom, Gaisler Research, daniel@gaisler.com |
| 4 | * |
| 5 | * (C) Copyright 2006 |
| 6 | * Detlev Zundel, DENX Software Engineering, dzu@denx.de |
| 7 | * |
| 8 | * (C) Copyright -2003 |
| 9 | * Wolfgang Denk, DENX Software Engineering, wd@denx.de. |
| 10 | * |
| 11 | * (C) Copyright 2001 |
| 12 | * Josh Huber <huber@mclx.com>, Mission Critical Linux, Inc. |
| 13 | * |
| 14 | * See file CREDITS for list of people who contributed to this |
| 15 | * project. |
| 16 | * |
| 17 | * This program is free software; you can redistribute it and/or |
| 18 | * modify it under the terms of the GNU General Public License as |
| 19 | * published by the Free Software Foundation; either version 2 of |
| 20 | * the License, or (at your option) any later version. |
| 21 | * |
| 22 | * This program is distributed in the hope that it will be useful, |
| 23 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 24 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 25 | * GNU General Public License for more details. |
| 26 | * |
| 27 | * You should have received a copy of the GNU General Public License |
| 28 | * along with this program; if not, write to the Free Software |
| 29 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, |
| 30 | * MA 02111-1307 USA |
| 31 | */ |
| 32 | |
| 33 | #include <asm/stack.h> |
| 34 | #include <common.h> |
| 35 | #include <asm/io.h> |
| 36 | #include <asm/processor.h> |
| 37 | #include <command.h> |
| 38 | #include <asm/irq.h> |
| 39 | |
| 40 | #include <asm/leon.h> |
| 41 | |
| 42 | /* 15 normal irqs and a non maskable interrupt */ |
| 43 | #define NR_IRQS 15 |
| 44 | |
| 45 | struct irq_action { |
| 46 | interrupt_handler_t *handler; |
| 47 | void *arg; |
| 48 | unsigned int count; |
| 49 | }; |
| 50 | |
| 51 | static struct irq_action irq_handlers[NR_IRQS] = { {0}, }; |
| 52 | static int spurious_irq_cnt = 0; |
| 53 | static int spurious_irq = 0; |
| 54 | |
| 55 | static inline unsigned int leon2_get_irqmask(unsigned int irq) |
| 56 | { |
| 57 | if ((irq < 0) || (irq >= NR_IRQS)) { |
| 58 | return 0; |
| 59 | } else { |
| 60 | return (1 << irq); |
| 61 | } |
| 62 | } |
| 63 | |
| 64 | static void leon2_ic_disable(unsigned int irq) |
| 65 | { |
| 66 | unsigned int mask, pil; |
| 67 | LEON2_regs *leon2 = (LEON2_regs *) LEON2_PREGS; |
| 68 | |
| 69 | pil = intLock(); |
| 70 | |
| 71 | /* get mask of interrupt */ |
| 72 | mask = leon2_get_irqmask(irq); |
| 73 | |
| 74 | /* set int level */ |
| 75 | leon2->Interrupt_Mask = |
| 76 | SPARC_NOCACHE_READ(&leon2->Interrupt_Mask) & (~mask); |
| 77 | |
| 78 | intUnlock(pil); |
| 79 | } |
| 80 | |
| 81 | static void leon2_ic_enable(unsigned int irq) |
| 82 | { |
| 83 | unsigned int mask, pil; |
| 84 | LEON2_regs *leon2 = (LEON2_regs *) LEON2_PREGS; |
| 85 | |
| 86 | pil = intLock(); |
| 87 | |
| 88 | /* get mask of interrupt */ |
| 89 | mask = leon2_get_irqmask(irq); |
| 90 | |
| 91 | /* set int level */ |
| 92 | leon2->Interrupt_Mask = |
| 93 | SPARC_NOCACHE_READ(&leon2->Interrupt_Mask) | mask; |
| 94 | |
| 95 | intUnlock(pil); |
| 96 | } |
| 97 | |
| 98 | void handler_irq(int irq, struct pt_regs *regs) |
| 99 | { |
| 100 | if (irq_handlers[irq].handler) { |
Jean-Christophe PLAGNIOL-VILLARD | 0383694 | 2008-10-16 15:01:15 +0200 | [diff] [blame] | 101 | if (((unsigned int)irq_handlers[irq].handler > CONFIG_SYS_RAM_END) || |
| 102 | ((unsigned int)irq_handlers[irq].handler < CONFIG_SYS_RAM_BASE) |
Daniel Hellstrom | 207e695 | 2008-03-28 10:00:33 +0100 | [diff] [blame] | 103 | ) { |
| 104 | printf("handler_irq: bad handler: %x, irq number %d\n", |
| 105 | (unsigned int)irq_handlers[irq].handler, irq); |
| 106 | return; |
| 107 | } |
| 108 | irq_handlers[irq].handler(irq_handlers[irq].arg); |
| 109 | irq_handlers[irq].count++; |
| 110 | } else { |
| 111 | spurious_irq_cnt++; |
| 112 | spurious_irq = irq; |
| 113 | } |
| 114 | } |
| 115 | |
| 116 | void leon2_force_int(int irq) |
| 117 | { |
| 118 | LEON2_regs *leon2 = (LEON2_regs *) LEON2_PREGS; |
| 119 | |
| 120 | if ((irq >= NR_IRQS) || (irq < 0)) |
| 121 | return; |
| 122 | printf("Forcing interrupt %d\n", irq); |
| 123 | |
| 124 | leon2->Interrupt_Force = |
| 125 | SPARC_NOCACHE_READ(&leon2->Interrupt_Force) | (1 << irq); |
| 126 | } |
| 127 | |
| 128 | /****************************************************************************/ |
| 129 | |
| 130 | int interrupt_init_cpu(void) |
| 131 | { |
| 132 | return (0); |
| 133 | } |
| 134 | |
| 135 | /****************************************************************************/ |
| 136 | |
| 137 | /* Handle Timer 0 IRQ */ |
| 138 | void timer_interrupt_cpu(void *arg) |
| 139 | { |
| 140 | LEON2_regs *leon2 = (LEON2_regs *) LEON2_PREGS; |
| 141 | |
| 142 | leon2->Timer_Control_1 = |
| 143 | (LEON2_TIMER_CTRL_EN | LEON2_TIMER_CTRL_RS | LEON2_TIMER_CTRL_LD); |
| 144 | |
| 145 | /* nothing to do here */ |
| 146 | return; |
| 147 | } |
| 148 | |
| 149 | /****************************************************************************/ |
| 150 | |
| 151 | /* |
| 152 | * Install and free a interrupt handler. |
| 153 | */ |
| 154 | |
| 155 | void irq_install_handler(int irq, interrupt_handler_t * handler, void *arg) |
| 156 | { |
| 157 | if (irq < 0 || irq >= NR_IRQS) { |
| 158 | printf("irq_install_handler: bad irq number %d\n", irq); |
| 159 | return; |
| 160 | } |
| 161 | |
| 162 | if (irq_handlers[irq].handler != NULL) |
| 163 | printf("irq_install_handler: 0x%08lx replacing 0x%08lx\n", |
| 164 | (ulong) handler, (ulong) irq_handlers[irq].handler); |
| 165 | |
Jean-Christophe PLAGNIOL-VILLARD | 0383694 | 2008-10-16 15:01:15 +0200 | [diff] [blame] | 166 | if (((unsigned int)handler > CONFIG_SYS_RAM_END) || |
| 167 | ((unsigned int)handler < CONFIG_SYS_RAM_BASE) |
Daniel Hellstrom | 207e695 | 2008-03-28 10:00:33 +0100 | [diff] [blame] | 168 | ) { |
| 169 | printf("irq_install_handler: bad handler: %x, irq number %d\n", |
| 170 | (unsigned int)handler, irq); |
| 171 | return; |
| 172 | } |
| 173 | irq_handlers[irq].handler = handler; |
| 174 | irq_handlers[irq].arg = arg; |
| 175 | |
| 176 | /* enable irq on LEON2 hardware */ |
| 177 | leon2_ic_enable(irq); |
| 178 | |
| 179 | } |
| 180 | |
| 181 | void irq_free_handler(int irq) |
| 182 | { |
| 183 | if (irq < 0 || irq >= NR_IRQS) { |
| 184 | printf("irq_free_handler: bad irq number %d\n", irq); |
| 185 | return; |
| 186 | } |
| 187 | |
| 188 | /* disable irq on LEON2 hardware */ |
| 189 | leon2_ic_disable(irq); |
| 190 | |
| 191 | irq_handlers[irq].handler = NULL; |
| 192 | irq_handlers[irq].arg = NULL; |
| 193 | } |
| 194 | |
| 195 | /****************************************************************************/ |
| 196 | |
| 197 | #if defined(CONFIG_CMD_IRQ) |
| 198 | void do_irqinfo(cmd_tbl_t * cmdtp, bd_t * bd, int flag, int argc, char *argv[]) |
| 199 | { |
| 200 | int irq; |
| 201 | unsigned int pil = get_pil(); |
| 202 | printf("PIL level: %u\n\r", pil); |
| 203 | printf("Spurious IRQ: %u, last unknown IRQ: %d\n", |
| 204 | spurious_irq_cnt, spurious_irq); |
| 205 | |
| 206 | puts("\nInterrupt-Information:\n" "Nr Routine Arg Count\n"); |
| 207 | |
| 208 | for (irq = 0; irq < NR_IRQS; irq++) { |
| 209 | if (irq_handlers[irq].handler != NULL) { |
| 210 | printf("%02d %08lx %08lx %ld\n", irq, |
| 211 | (unsigned int)irq_handlers[irq].handler, |
| 212 | (unsigned int)irq_handlers[irq].arg, |
| 213 | irq_handlers[irq].count); |
| 214 | } |
| 215 | } |
| 216 | } |
| 217 | #endif |