hw/ppc_booke.c

   1 /*
   2  * QEMU PowerPC Booke hardware System Emulator
   3  *
   4  * Copyright (c) 2011 AdaCore
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24 #include "hw.h"
  25 #include "ppc.h"
  26 #include "qemu/timer.h"
  27 #include "sysemu.h"
  28 #include "nvram.h"
  29 #include "qemu/log.h"
  30 #include "loader.h"
  31
  32
  33 /* Timer Control Register */
  34
  35 #define TCR_WP_SHIFT  30        /* Watchdog Timer Period */
  36 #define TCR_WP_MASK   (0x3 << TCR_WP_SHIFT)
  37 #define TCR_WRC_SHIFT 28        /* Watchdog Timer Reset Control */
  38 #define TCR_WRC_MASK  (0x3 << TCR_WRC_SHIFT)
  39 #define TCR_WIE       (1 << 27) /* Watchdog Timer Interrupt Enable */
  40 #define TCR_DIE       (1 << 26) /* Decrementer Interrupt Enable */
  41 #define TCR_FP_SHIFT  24        /* Fixed-Interval Timer Period */
  42 #define TCR_FP_MASK   (0x3 << TCR_FP_SHIFT)
  43 #define TCR_FIE       (1 << 23) /* Fixed-Interval Timer Interrupt Enable */
  44 #define TCR_ARE       (1 << 22) /* Auto-Reload Enable */
  45
  46 /* Timer Control Register (e500 specific fields) */
  47
  48 #define TCR_E500_FPEXT_SHIFT 13 /* Fixed-Interval Timer Period Extension */
  49 #define TCR_E500_FPEXT_MASK  (0xf << TCR_E500_FPEXT_SHIFT)
  50 #define TCR_E500_WPEXT_SHIFT 17 /* Watchdog Timer Period Extension */
  51 #define TCR_E500_WPEXT_MASK  (0xf << TCR_E500_WPEXT_SHIFT)
  52
  53 /* Timer Status Register  */
  54
  55 #define TSR_FIS       (1 << 26) /* Fixed-Interval Timer Interrupt Status */
  56 #define TSR_DIS       (1 << 27) /* Decrementer Interrupt Status */
  57 #define TSR_WRS_SHIFT 28        /* Watchdog Timer Reset Status */
  58 #define TSR_WRS_MASK  (0x3 << TSR_WRS_SHIFT)
  59 #define TSR_WIS       (1 << 30) /* Watchdog Timer Interrupt Status */
  60 #define TSR_ENW       (1 << 31) /* Enable Next Watchdog Timer */
  61
  62 typedef struct booke_timer_t booke_timer_t;
  63 struct booke_timer_t {
  64
  65     uint64_t fit_next;
  66     struct QEMUTimer *fit_timer;
  67
  68     uint64_t wdt_next;
  69     struct QEMUTimer *wdt_timer;
  70
  71     uint32_t flags;
  72 };
  73
  74 static void booke_update_irq(CPUPPCState *env)
  75 {
  76     ppc_set_irq(env, PPC_INTERRUPT_DECR,
  77                 (env->spr[SPR_BOOKE_TSR] & TSR_DIS
  78                  && env->spr[SPR_BOOKE_TCR] & TCR_DIE));
  79
  80     ppc_set_irq(env, PPC_INTERRUPT_WDT,
  81                 (env->spr[SPR_BOOKE_TSR] & TSR_WIS
  82                  && env->spr[SPR_BOOKE_TCR] & TCR_WIE));
  83
  84     ppc_set_irq(env, PPC_INTERRUPT_FIT,
  85                 (env->spr[SPR_BOOKE_TSR] & TSR_FIS
  86                  && env->spr[SPR_BOOKE_TCR] & TCR_FIE));
  87 }
  88
  89 /* Return the location of the bit of time base at which the FIT will raise an
  90    interrupt */
  91 static uint8_t booke_get_fit_target(CPUPPCState *env, ppc_tb_t *tb_env)
  92 {
  93     uint8_t fp = (env->spr[SPR_BOOKE_TCR] & TCR_FP_MASK) >> TCR_FP_SHIFT;
  94
  95     if (tb_env->flags & PPC_TIMER_E500) {
  96         /* e500 Fixed-interval timer period extension */
  97         uint32_t fpext = (env->spr[SPR_BOOKE_TCR] & TCR_E500_FPEXT_MASK)
  98             >> TCR_E500_FPEXT_SHIFT;
  99         fp = 63 - (fp | fpext << 2);
 100     } else {
 101         fp = env->fit_period[fp];
 102     }
 103
 104     return fp;
 105 }
 106
 107 /* Return the location of the bit of time base at which the WDT will raise an
 108    interrupt */
 109 static uint8_t booke_get_wdt_target(CPUPPCState *env, ppc_tb_t *tb_env)
 110 {
 111     uint8_t wp = (env->spr[SPR_BOOKE_TCR] & TCR_WP_MASK) >> TCR_WP_SHIFT;
 112
 113     if (tb_env->flags & PPC_TIMER_E500) {
 114         /* e500 Watchdog timer period extension */
 115         uint32_t wpext = (env->spr[SPR_BOOKE_TCR] & TCR_E500_WPEXT_MASK)
 116             >> TCR_E500_WPEXT_SHIFT;
 117         wp = 63 - (wp | wpext << 2);
 118     } else {
 119         wp = env->wdt_period[wp];
 120     }
 121
 122     return wp;
 123 }
 124
 125 static void booke_update_fixed_timer(CPUPPCState         *env,
 126                                      uint8_t           target_bit,
 127                                      uint64_t          *next,
 128                                      struct QEMUTimer *timer)
 129 {
 130     ppc_tb_t *tb_env = env->tb_env;
 131     uint64_t lapse;
 132     uint64_t tb;
 133     uint64_t period = 1 << (target_bit + 1);
 134     uint64_t now;
 135
 136     now = qemu_get_clock_ns(vm_clock);
 137     tb  = cpu_ppc_get_tb(tb_env, now, tb_env->tb_offset);
 138
 139     lapse = period - ((tb - (1 << target_bit)) & (period - 1));
 140
 141     *next = now + muldiv64(lapse, get_ticks_per_sec(), tb_env->tb_freq);
 142
 143     /* XXX: If expire time is now. We can't run the callback because we don't
 144      * have access to it. So we just set the timer one nanosecond later.
 145      */
 146
 147     if (*next == now) {
 148         (*next)++;
 149     }
 150
 151     qemu_mod_timer(timer, *next);
 152 }
 153
 154 static void booke_decr_cb(void *opaque)
 155 {
 156     CPUPPCState *env = opaque;
 157
 158     env->spr[SPR_BOOKE_TSR] |= TSR_DIS;
 159     booke_update_irq(env);
 160
 161     if (env->spr[SPR_BOOKE_TCR] & TCR_ARE) {
 162         /* Auto Reload */
 163         cpu_ppc_store_decr(env, env->spr[SPR_BOOKE_DECAR]);
 164     }
 165 }
 166
 167 static void booke_fit_cb(void *opaque)
 168 {
 169     CPUPPCState *env;
 170     ppc_tb_t *tb_env;
 171     booke_timer_t *booke_timer;
 172
 173     env = opaque;
 174     tb_env = env->tb_env;
 175     booke_timer = tb_env->opaque;
 176     env->spr[SPR_BOOKE_TSR] |= TSR_FIS;
 177
 178     booke_update_irq(env);
 179
 180     booke_update_fixed_timer(env,
 181                              booke_get_fit_target(env, tb_env),
 182                              &booke_timer->fit_next,
 183                              booke_timer->fit_timer);
 184 }
 185
 186 static void booke_wdt_cb(void *opaque)
 187 {
 188     CPUPPCState *env;
 189     ppc_tb_t *tb_env;
 190     booke_timer_t *booke_timer;
 191
 192     env = opaque;
 193     tb_env = env->tb_env;
 194     booke_timer = tb_env->opaque;
 195
 196     /* TODO: There's lots of complicated stuff to do here */
 197
 198     booke_update_irq(env);
 199
 200     booke_update_fixed_timer(env,
 201                              booke_get_wdt_target(env, tb_env),
 202                              &booke_timer->wdt_next,
 203                              booke_timer->wdt_timer);
 204 }
 205
 206 void store_booke_tsr(CPUPPCState *env, target_ulong val)
 207 {
 208     env->spr[SPR_BOOKE_TSR] &= ~val;
 209     booke_update_irq(env);
 210 }
 211
 212 void store_booke_tcr(CPUPPCState *env, target_ulong val)
 213 {
 214     ppc_tb_t *tb_env = env->tb_env;
 215     booke_timer_t *booke_timer = tb_env->opaque;
 216
 217     tb_env = env->tb_env;
 218     env->spr[SPR_BOOKE_TCR] = val;
 219
 220     booke_update_irq(env);
 221
 222     booke_update_fixed_timer(env,
 223                              booke_get_fit_target(env, tb_env),
 224                              &booke_timer->fit_next,
 225                              booke_timer->fit_timer);
 226
 227     booke_update_fixed_timer(env,
 228                              booke_get_wdt_target(env, tb_env),
 229                              &booke_timer->wdt_next,
 230                              booke_timer->wdt_timer);
 231
 232 }
 233
 234 void ppc_booke_timers_init(CPUPPCState *env, uint32_t freq, uint32_t flags)
 235 {
 236     ppc_tb_t *tb_env;
 237     booke_timer_t *booke_timer;
 238
 239     tb_env      = g_malloc0(sizeof(ppc_tb_t));
 240     booke_timer = g_malloc0(sizeof(booke_timer_t));
 241
 242     env->tb_env = tb_env;
 243     tb_env->flags = flags | PPC_TIMER_BOOKE | PPC_DECR_ZERO_TRIGGERED;
 244
 245     tb_env->tb_freq    = freq;
 246     tb_env->decr_freq  = freq;
 247     tb_env->opaque     = booke_timer;
 248     tb_env->decr_timer = qemu_new_timer_ns(vm_clock, &booke_decr_cb, env);
 249
 250     booke_timer->fit_timer =
 251         qemu_new_timer_ns(vm_clock, &booke_fit_cb, env);
 252     booke_timer->wdt_timer =
 253         qemu_new_timer_ns(vm_clock, &booke_wdt_cb, env);
 254 }