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/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(PowerPCCPU *cpu)
  75 {
  76     CPUPPCState *env = &cpu->env;
  77
  78     ppc_set_irq(cpu, PPC_INTERRUPT_DECR,
  79                 (env->spr[SPR_BOOKE_TSR] & TSR_DIS
  80                  && env->spr[SPR_BOOKE_TCR] & TCR_DIE));
  81
  82     ppc_set_irq(cpu, PPC_INTERRUPT_WDT,
  83                 (env->spr[SPR_BOOKE_TSR] & TSR_WIS
  84                  && env->spr[SPR_BOOKE_TCR] & TCR_WIE));
  85
  86     ppc_set_irq(cpu, PPC_INTERRUPT_FIT,
  87                 (env->spr[SPR_BOOKE_TSR] & TSR_FIS
  88                  && env->spr[SPR_BOOKE_TCR] & TCR_FIE));
  89 }
  90
  91 /* Return the location of the bit of time base at which the FIT will raise an
  92    interrupt */
  93 static uint8_t booke_get_fit_target(CPUPPCState *env, ppc_tb_t *tb_env)
  94 {
  95     uint8_t fp = (env->spr[SPR_BOOKE_TCR] & TCR_FP_MASK) >> TCR_FP_SHIFT;
  96
  97     if (tb_env->flags & PPC_TIMER_E500) {
  98         /* e500 Fixed-interval timer period extension */
  99         uint32_t fpext = (env->spr[SPR_BOOKE_TCR] & TCR_E500_FPEXT_MASK)
 100             >> TCR_E500_FPEXT_SHIFT;
 101         fp = 63 - (fp | fpext << 2);
 102     } else {
 103         fp = env->fit_period[fp];
 104     }
 105
 106     return fp;
 107 }
 108
 109 /* Return the location of the bit of time base at which the WDT will raise an
 110    interrupt */
 111 static uint8_t booke_get_wdt_target(CPUPPCState *env, ppc_tb_t *tb_env)
 112 {
 113     uint8_t wp = (env->spr[SPR_BOOKE_TCR] & TCR_WP_MASK) >> TCR_WP_SHIFT;
 114
 115     if (tb_env->flags & PPC_TIMER_E500) {
 116         /* e500 Watchdog timer period extension */
 117         uint32_t wpext = (env->spr[SPR_BOOKE_TCR] & TCR_E500_WPEXT_MASK)
 118             >> TCR_E500_WPEXT_SHIFT;
 119         wp = 63 - (wp | wpext << 2);
 120     } else {
 121         wp = env->wdt_period[wp];
 122     }
 123
 124     return wp;
 125 }
 126
 127 static void booke_update_fixed_timer(CPUPPCState         *env,
 128                                      uint8_t           target_bit,
 129                                      uint64_t          *next,
 130                                      struct QEMUTimer *timer)
 131 {
 132     ppc_tb_t *tb_env = env->tb_env;
 133     uint64_t lapse;
 134     uint64_t tb;
 135     uint64_t period = 1 << (target_bit + 1);
 136     uint64_t now;
 137
 138     now = qemu_get_clock_ns(vm_clock);
 139     tb  = cpu_ppc_get_tb(tb_env, now, tb_env->tb_offset);
 140
 141     lapse = period - ((tb - (1 << target_bit)) & (period - 1));
 142
 143     *next = now + muldiv64(lapse, get_ticks_per_sec(), tb_env->tb_freq);
 144
 145     /* XXX: If expire time is now. We can't run the callback because we don't
 146      * have access to it. So we just set the timer one nanosecond later.
 147      */
 148
 149     if (*next == now) {
 150         (*next)++;
 151     }
 152
 153     qemu_mod_timer(timer, *next);
 154 }
 155
 156 static void booke_decr_cb(void *opaque)
 157 {
 158     PowerPCCPU *cpu = opaque;
 159     CPUPPCState *env = &cpu->env;
 160
 161     env->spr[SPR_BOOKE_TSR] |= TSR_DIS;
 162     booke_update_irq(cpu);
 163
 164     if (env->spr[SPR_BOOKE_TCR] & TCR_ARE) {
 165         /* Auto Reload */
 166         cpu_ppc_store_decr(env, env->spr[SPR_BOOKE_DECAR]);
 167     }
 168 }
 169
 170 static void booke_fit_cb(void *opaque)
 171 {
 172     PowerPCCPU *cpu = opaque;
 173     CPUPPCState *env = &cpu->env;
 174     ppc_tb_t *tb_env;
 175     booke_timer_t *booke_timer;
 176
 177     tb_env = env->tb_env;
 178     booke_timer = tb_env->opaque;
 179     env->spr[SPR_BOOKE_TSR] |= TSR_FIS;
 180
 181     booke_update_irq(cpu);
 182
 183     booke_update_fixed_timer(env,
 184                              booke_get_fit_target(env, tb_env),
 185                              &booke_timer->fit_next,
 186                              booke_timer->fit_timer);
 187 }
 188
 189 static void booke_wdt_cb(void *opaque)
 190 {
 191     PowerPCCPU *cpu = opaque;
 192     CPUPPCState *env = &cpu->env;
 193     ppc_tb_t *tb_env;
 194     booke_timer_t *booke_timer;
 195
 196     tb_env = env->tb_env;
 197     booke_timer = tb_env->opaque;
 198
 199     /* TODO: There's lots of complicated stuff to do here */
 200
 201     booke_update_irq(cpu);
 202
 203     booke_update_fixed_timer(env,
 204                              booke_get_wdt_target(env, tb_env),
 205                              &booke_timer->wdt_next,
 206                              booke_timer->wdt_timer);
 207 }
 208
 209 void store_booke_tsr(CPUPPCState *env, target_ulong val)
 210 {
 211     PowerPCCPU *cpu = ppc_env_get_cpu(env);
 212
 213     env->spr[SPR_BOOKE_TSR] &= ~val;
 214     booke_update_irq(cpu);
 215 }
 216
 217 void store_booke_tcr(CPUPPCState *env, target_ulong val)
 218 {
 219     PowerPCCPU *cpu = ppc_env_get_cpu(env);
 220     ppc_tb_t *tb_env = env->tb_env;
 221     booke_timer_t *booke_timer = tb_env->opaque;
 222
 223     tb_env = env->tb_env;
 224     env->spr[SPR_BOOKE_TCR] = val;
 225
 226     booke_update_irq(cpu);
 227
 228     booke_update_fixed_timer(env,
 229                              booke_get_fit_target(env, tb_env),
 230                              &booke_timer->fit_next,
 231                              booke_timer->fit_timer);
 232
 233     booke_update_fixed_timer(env,
 234                              booke_get_wdt_target(env, tb_env),
 235                              &booke_timer->wdt_next,
 236                              booke_timer->wdt_timer);
 237
 238 }
 239
 240 void ppc_booke_timers_init(PowerPCCPU *cpu, uint32_t freq, uint32_t flags)
 241 {
 242     ppc_tb_t *tb_env;
 243     booke_timer_t *booke_timer;
 244
 245     tb_env      = g_malloc0(sizeof(ppc_tb_t));
 246     booke_timer = g_malloc0(sizeof(booke_timer_t));
 247
 248     cpu->env.tb_env = tb_env;
 249     tb_env->flags = flags | PPC_TIMER_BOOKE | PPC_DECR_ZERO_TRIGGERED;
 250
 251     tb_env->tb_freq    = freq;
 252     tb_env->decr_freq  = freq;
 253     tb_env->opaque     = booke_timer;
 254     tb_env->decr_timer = qemu_new_timer_ns(vm_clock, &booke_decr_cb, cpu);
 255
 256     booke_timer->fit_timer =
 257         qemu_new_timer_ns(vm_clock, &booke_fit_cb, cpu);
 258     booke_timer->wdt_timer =
 259         qemu_new_timer_ns(vm_clock, &booke_wdt_cb, cpu);
 260 }