Jon Loeliger | debb735 | 2006-04-26 17:58:56 -0500 | [diff] [blame] | 1 | /* |
| 2 | * (C) Copyright 2000-2002 |
| 3 | * Wolfgang Denk, DENX Software Engineering, wd@denx.de. |
| 4 | * |
| 5 | * (C) Copyright 2002 (440 port) |
| 6 | * Scott McNutt, Artesyn Communication Producs, smcnutt@artsyncp.com |
| 7 | * |
| 8 | * (C) Copyright 2003 Motorola Inc. (MPC85xx port) |
| 9 | * Xianghua Xiao (X.Xiao@motorola.com) |
| 10 | * |
| 11 | * (C) Copyright 2004 Freescale Semiconductor. (MPC86xx Port) |
Jon Loeliger | c934f65 | 2006-05-31 13:55:35 -0500 | [diff] [blame] | 12 | * Jeff Brown |
Jon Loeliger | debb735 | 2006-04-26 17:58:56 -0500 | [diff] [blame] | 13 | * Srikanth Srinivasan (srikanth.srinivasan@freescale.com) |
| 14 | * |
| 15 | * See file CREDITS for list of people who contributed to this |
| 16 | * project. |
| 17 | * |
| 18 | * This program is free software; you can redistribute it and/or |
| 19 | * modify it under the terms of the GNU General Public License as |
| 20 | * published by the Free Software Foundation; either version 2 of |
| 21 | * the License, or (at your option) any later version. |
| 22 | * |
| 23 | * This program is distributed in the hope that it will be useful, |
| 24 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 25 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 26 | * GNU General Public License for more details. |
| 27 | * |
| 28 | * You should have received a copy of the GNU General Public License |
| 29 | * along with this program; if not, write to the Free Software |
| 30 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, |
| 31 | * MA 02111-1307 USA |
| 32 | */ |
| 33 | |
| 34 | #include <common.h> |
| 35 | #include <mpc86xx.h> |
| 36 | #include <command.h> |
| 37 | #include <asm/processor.h> |
| 38 | #include <ppc_asm.tmpl> |
| 39 | |
Jon Loeliger | c934f65 | 2006-05-31 13:55:35 -0500 | [diff] [blame] | 40 | unsigned long decrementer_count; /* count value for 1e6/HZ microseconds */ |
Jon Loeliger | debb735 | 2006-04-26 17:58:56 -0500 | [diff] [blame] | 41 | unsigned long timestamp; |
| 42 | |
Jon Loeliger | c934f65 | 2006-05-31 13:55:35 -0500 | [diff] [blame] | 43 | |
Jon Loeliger | debb735 | 2006-04-26 17:58:56 -0500 | [diff] [blame] | 44 | static __inline__ unsigned long get_msr (void) |
| 45 | { |
| 46 | unsigned long msr; |
| 47 | |
| 48 | asm volatile ("mfmsr %0":"=r" (msr):); |
| 49 | |
| 50 | return msr; |
| 51 | } |
| 52 | |
| 53 | static __inline__ void set_msr (unsigned long msr) |
| 54 | { |
| 55 | asm volatile ("mtmsr %0"::"r" (msr)); |
| 56 | } |
| 57 | |
| 58 | static __inline__ unsigned long get_dec (void) |
| 59 | { |
| 60 | unsigned long val; |
| 61 | |
| 62 | asm volatile ("mfdec %0":"=r" (val):); |
| 63 | |
| 64 | return val; |
| 65 | } |
| 66 | |
| 67 | |
| 68 | static __inline__ void set_dec (unsigned long val) |
| 69 | { |
| 70 | if (val) |
| 71 | asm volatile ("mtdec %0"::"r" (val)); |
| 72 | } |
| 73 | |
| 74 | /* interrupt is not supported yet */ |
| 75 | int interrupt_init_cpu (unsigned *decrementer_count) |
| 76 | { |
Jon Loeliger | c934f65 | 2006-05-31 13:55:35 -0500 | [diff] [blame] | 77 | return 0; |
Jon Loeliger | debb735 | 2006-04-26 17:58:56 -0500 | [diff] [blame] | 78 | } |
| 79 | |
| 80 | |
| 81 | int interrupt_init (void) |
| 82 | { |
| 83 | int ret; |
| 84 | |
| 85 | /* call cpu specific function from $(CPU)/interrupts.c */ |
| 86 | ret = interrupt_init_cpu (&decrementer_count); |
| 87 | |
| 88 | if (ret) |
| 89 | return ret; |
| 90 | |
Jon Loeliger | c934f65 | 2006-05-31 13:55:35 -0500 | [diff] [blame] | 91 | decrementer_count = get_tbclk()/CFG_HZ; |
| 92 | debug("interrupt init: tbclk() = %d MHz, decrementer_count = %d\n", (get_tbclk()/1000000), decrementer_count); |
Jon Loeliger | 5c9efb3 | 2006-04-27 10:15:16 -0500 | [diff] [blame] | 93 | |
Jon Loeliger | c934f65 | 2006-05-31 13:55:35 -0500 | [diff] [blame] | 94 | set_dec (decrementer_count); |
Jon Loeliger | debb735 | 2006-04-26 17:58:56 -0500 | [diff] [blame] | 95 | |
| 96 | set_msr (get_msr () | MSR_EE); |
| 97 | |
Jon Loeliger | c934f65 | 2006-05-31 13:55:35 -0500 | [diff] [blame] | 98 | debug("MSR = 0x%08lx, Decrementer reg = 0x%08lx\n", get_msr(), get_dec()); |
Jon Loeliger | 5c9efb3 | 2006-04-27 10:15:16 -0500 | [diff] [blame] | 99 | |
| 100 | return 0; |
Jon Loeliger | debb735 | 2006-04-26 17:58:56 -0500 | [diff] [blame] | 101 | } |
| 102 | |
| 103 | |
| 104 | void enable_interrupts (void) |
| 105 | { |
| 106 | set_msr (get_msr () | MSR_EE); |
| 107 | } |
| 108 | |
| 109 | /* returns flag if MSR_EE was set before */ |
| 110 | int disable_interrupts (void) |
| 111 | { |
| 112 | ulong msr = get_msr (); |
| 113 | |
| 114 | set_msr (msr & ~MSR_EE); |
Jon Loeliger | 5c9efb3 | 2006-04-27 10:15:16 -0500 | [diff] [blame] | 115 | return (msr & MSR_EE) != 0; |
Jon Loeliger | debb735 | 2006-04-26 17:58:56 -0500 | [diff] [blame] | 116 | } |
| 117 | |
| 118 | |
| 119 | void increment_timestamp(void) |
| 120 | { |
Jon Loeliger | c934f65 | 2006-05-31 13:55:35 -0500 | [diff] [blame] | 121 | timestamp++; |
Jon Loeliger | debb735 | 2006-04-26 17:58:56 -0500 | [diff] [blame] | 122 | } |
| 123 | |
| 124 | /* |
| 125 | * timer_interrupt - gets called when the decrementer overflows, |
| 126 | * with interrupts disabled. |
| 127 | * Trivial implementation - no need to be really accurate. |
| 128 | */ |
| 129 | void |
| 130 | timer_interrupt_cpu (struct pt_regs *regs) |
| 131 | { |
| 132 | /* nothing to do here */ |
Jon Loeliger | debb735 | 2006-04-26 17:58:56 -0500 | [diff] [blame] | 133 | } |
| 134 | |
| 135 | |
| 136 | void timer_interrupt (struct pt_regs *regs) |
| 137 | { |
Jon Loeliger | c934f65 | 2006-05-31 13:55:35 -0500 | [diff] [blame] | 138 | /* call cpu specific function from $(CPU)/interrupts.c */ |
| 139 | timer_interrupt_cpu (regs); |
Jon Loeliger | 5c9efb3 | 2006-04-27 10:15:16 -0500 | [diff] [blame] | 140 | |
Jon Loeliger | c934f65 | 2006-05-31 13:55:35 -0500 | [diff] [blame] | 141 | timestamp++; |
Jon Loeliger | debb735 | 2006-04-26 17:58:56 -0500 | [diff] [blame] | 142 | |
Jon Loeliger | c934f65 | 2006-05-31 13:55:35 -0500 | [diff] [blame] | 143 | ppcDcbf(×tamp); |
Jon Loeliger | 5c9efb3 | 2006-04-27 10:15:16 -0500 | [diff] [blame] | 144 | |
Jon Loeliger | c934f65 | 2006-05-31 13:55:35 -0500 | [diff] [blame] | 145 | /* Restore Decrementer Count */ |
| 146 | set_dec (decrementer_count); |
Jon Loeliger | 5c9efb3 | 2006-04-27 10:15:16 -0500 | [diff] [blame] | 147 | |
Jon Loeliger | debb735 | 2006-04-26 17:58:56 -0500 | [diff] [blame] | 148 | #if defined(CONFIG_WATCHDOG) || defined (CONFIG_HW_WATCHDOG) |
| 149 | if ((timestamp % (CFG_WATCHDOG_FREQ)) == 0) |
| 150 | WATCHDOG_RESET (); |
| 151 | #endif /* CONFIG_WATCHDOG || CONFIG_HW_WATCHDOG */ |
| 152 | |
| 153 | #ifdef CONFIG_STATUS_LED |
| 154 | status_led_tick (timestamp); |
| 155 | #endif /* CONFIG_STATUS_LED */ |
| 156 | |
| 157 | #ifdef CONFIG_SHOW_ACTIVITY |
| 158 | board_show_activity (timestamp); |
| 159 | #endif /* CONFIG_SHOW_ACTIVITY */ |
| 160 | |
| 161 | |
| 162 | } |
| 163 | |
| 164 | void reset_timer (void) |
| 165 | { |
Jon Loeliger | c934f65 | 2006-05-31 13:55:35 -0500 | [diff] [blame] | 166 | timestamp = 0; |
Jon Loeliger | debb735 | 2006-04-26 17:58:56 -0500 | [diff] [blame] | 167 | } |
| 168 | |
| 169 | ulong get_timer (ulong base) |
Jon Loeliger | 5c9efb3 | 2006-04-27 10:15:16 -0500 | [diff] [blame] | 170 | { |
Jon Loeliger | c934f65 | 2006-05-31 13:55:35 -0500 | [diff] [blame] | 171 | return timestamp - base; |
Jon Loeliger | debb735 | 2006-04-26 17:58:56 -0500 | [diff] [blame] | 172 | } |
| 173 | |
| 174 | void set_timer (ulong t) |
| 175 | { |
Jon Loeliger | c934f65 | 2006-05-31 13:55:35 -0500 | [diff] [blame] | 176 | timestamp = t; |
Jon Loeliger | debb735 | 2006-04-26 17:58:56 -0500 | [diff] [blame] | 177 | } |
| 178 | |
| 179 | /* |
| 180 | * Install and free a interrupt handler. Not implemented yet. |
| 181 | */ |
| 182 | |
| 183 | void |
| 184 | irq_install_handler(int vec, interrupt_handler_t *handler, void *arg) |
| 185 | { |
Jon Loeliger | debb735 | 2006-04-26 17:58:56 -0500 | [diff] [blame] | 186 | } |
| 187 | |
| 188 | void |
| 189 | irq_free_handler(int vec) |
| 190 | { |
Jon Loeliger | debb735 | 2006-04-26 17:58:56 -0500 | [diff] [blame] | 191 | } |
| 192 | |
| 193 | |
Jon Loeliger | c934f65 | 2006-05-31 13:55:35 -0500 | [diff] [blame] | 194 | /* |
Jon Loeliger | debb735 | 2006-04-26 17:58:56 -0500 | [diff] [blame] | 195 | * irqinfo - print information about PCI devices,not implemented. |
Jon Loeliger | debb735 | 2006-04-26 17:58:56 -0500 | [diff] [blame] | 196 | */ |
| 197 | int |
| 198 | do_irqinfo(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]) |
| 199 | { |
| 200 | printf ("\nInterrupt-unsupported:\n"); |
| 201 | |
| 202 | return 0; |
| 203 | } |
| 204 | |
| 205 | /* |
| 206 | * Handle external interrupts |
| 207 | */ |
| 208 | void |
| 209 | external_interrupt(struct pt_regs *regs) |
| 210 | { |
| 211 | puts("external_interrupt (oops!)\n"); |
| 212 | } |
| 213 | |
| 214 | |
| 215 | |
| 216 | |
| 217 | |
| 218 | |