[Qemu-devel] [PATCH 2/4] powerpc: Make the decr interrupt type overridable

["Edgar E. Iglesias" <edgar.iglesias@gmail.com>]

Make it possible for boards to override the kind of interrupt
to be signaled when the decr timer hits. The 405's signal PIT
interrupts while the 440's signal DECR.

Signed-off-by: Edgar E. Iglesias <edgar.iglesias@gmail.com>
---
 hw/ppc.c |   22 ++++++++++++++++++++--
 hw/ppc.h |    2 ++
 2 files changed, 22 insertions(+), 2 deletions(-)

diff --git a/hw/ppc.c b/hw/ppc.c
index 55e3808..3df7801 100644
--- a/hw/ppc.c
+++ b/hw/ppc.c
@@ -769,6 +769,9 @@ struct ppcemb_timer_t {
     struct QEMUTimer *fit_timer;
     uint64_t wdt_next;    /* Tick for next WDT interrupt  */
     struct QEMUTimer *wdt_timer;
+
+    /* 405 have the PIT, 440 have a DECR.  */
+    unsigned int decr_excp;
 };
 
 /* Fixed interval timer */
@@ -851,7 +854,7 @@ static void cpu_4xx_pit_cb (void *opaque)
     ppcemb_timer = tb_env->opaque;
     env->spr[SPR_40x_TSR] |= 1 << 27;
     if ((env->spr[SPR_40x_TCR] >> 26) & 0x1)
-        ppc_set_irq(env, PPC_INTERRUPT_PIT, 1);
+        ppc_set_irq(env, ppcemb_timer->decr_excp, 1);
     start_stop_pit(env, tb_env, 1);
     LOG_TB("%s: ar %d ir %d TCR " TARGET_FMT_lx " TSR " TARGET_FMT_lx " "
            "%016" PRIx64 "\n", __func__,
@@ -948,10 +951,15 @@ target_ulong load_40x_pit (CPUState *env)
 
 void store_booke_tsr (CPUState *env, target_ulong val)
 {
+    ppc_tb_t *tb_env = env->tb_env;
+    ppcemb_timer_t *ppcemb_timer;
+
+    ppcemb_timer = tb_env->opaque;
+
     LOG_TB("%s: val " TARGET_FMT_lx "\n", __func__, val);
     env->spr[SPR_40x_TSR] &= ~(val & 0xFC000000);
     if (val & 0x80000000)
-        ppc_set_irq(env, PPC_INTERRUPT_PIT, 0);
+        ppc_set_irq(env, ppcemb_timer->decr_excp, 0);
 }
 
 void store_booke_tcr (CPUState *env, target_ulong val)
@@ -977,6 +985,15 @@ static void ppc_emb_set_tb_clk (void *opaque, uint32_t freq)
     /* XXX: we should also update all timers */
 }
 
+void ppc_emb_timers_set_decr_excp(CPUState *env, unsigned int excp)
+{
+    ppc_tb_t *tb_env = env->tb_env;
+    ppcemb_timer_t *ppcemb_timer;
+
+    ppcemb_timer = tb_env->opaque;
+    ppcemb_timer->decr_excp = excp;
+}
+
 clk_setup_cb ppc_emb_timers_init (CPUState *env, uint32_t freq)
 {
     ppc_tb_t *tb_env;
@@ -996,6 +1013,7 @@ clk_setup_cb ppc_emb_timers_init (CPUState *env, uint32_t freq)
             qemu_new_timer(vm_clock, &cpu_4xx_fit_cb, env);
         ppcemb_timer->wdt_timer =
             qemu_new_timer(vm_clock, &cpu_4xx_wdt_cb, env);
+        ppcemb_timer->decr_excp = PPC_INTERRUPT_PIT;
     }
 
     return &ppc_emb_set_tb_clk;
diff --git a/hw/ppc.h b/hw/ppc.h
index 1251932..a0fc651 100644
--- a/hw/ppc.h
+++ b/hw/ppc.h
@@ -20,6 +20,8 @@ int ppc_dcr_init (CPUState *env, int (*dcr_read_error)(int dcrn),
 int ppc_dcr_register (CPUState *env, int dcrn, void *opaque,
                       dcr_read_cb drc_read, dcr_write_cb dcr_write);
 clk_setup_cb ppc_emb_timers_init (CPUState *env, uint32_t freq);
+void ppc_emb_timers_set_decr_excp(CPUState *env, unsigned int excp);
+
 /* Embedded PowerPC reset */
 void ppc40x_core_reset (CPUState *env);
 void ppc40x_chip_reset (CPUState *env);
-- 
1.7.1