hw/m68k/mcf5208: add support for reset

Add reset support for mcf5208.

Signed-off-by: Angelo Dureghello <angelo@kernel-space.org>
Reviewed-by: Thomas Huth <huth@tuxfamily.org>
Message-ID: <20240309093459.984565-1-angelo@kernel-space.org>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>

1 files changed, 42 insertions, 2 deletions

diff --git a/hw/m68k/mcf5208.c b/hw/m68k/mcf5208.c
index 0cfb806..ec14096 100644
--- a/hw/m68k/mcf5208.c
+++ b/hw/m68k/mcf5208.c
@@ -40,6 +40,8 @@
 #define PCSR_PRE_SHIFT  8
 #define PCSR_PRE_MASK   0x0f00
 
+#define RCR_SOFTRST     0x80
+
 typedef struct {
     MemoryRegion iomem;
     qemu_irq irq;
@@ -185,12 +187,50 @@ static const MemoryRegionOps m5208_sys_ops = {
     .endianness = DEVICE_NATIVE_ENDIAN,
 };
 
-static void mcf5208_sys_init(MemoryRegion *address_space, qemu_irq *pic)
+static uint64_t m5208_rcm_read(void *opaque, hwaddr addr,
+                               unsigned size)
+{
+    return 0;
+}
+
+static void m5208_rcm_write(void *opaque, hwaddr addr,
+                            uint64_t value, unsigned size)
+{
+    M68kCPU *cpu = opaque;
+    CPUState *cs = CPU(cpu);
+    switch (addr) {
+    case 0x0: /* RCR */
+        if (value & RCR_SOFTRST) {
+            cpu_reset(cs);
+            cpu->env.aregs[7] = ldl_phys(cs->as, 0);
+            cpu->env.pc = ldl_phys(cs->as, 4);
+        }
+        break;
+    default:
+        qemu_log_mask(LOG_GUEST_ERROR, "%s: Bad offset 0x%" HWADDR_PRIX "\n",
+                      __func__, addr);
+        break;
+    }
+}
+
+static const MemoryRegionOps m5208_rcm_ops = {
+    .read = m5208_rcm_read,
+    .write = m5208_rcm_write,
+    .endianness = DEVICE_NATIVE_ENDIAN,
+};
+
+static void mcf5208_sys_init(MemoryRegion *address_space, qemu_irq *pic,
+                             M68kCPU *cpu)
 {
     MemoryRegion *iomem = g_new(MemoryRegion, 1);
+    MemoryRegion *iomem_rcm = g_new(MemoryRegion, 1);
     m5208_timer_state *s;
     int i;
 
+    /* RCM */
+    memory_region_init_io(iomem_rcm, NULL, &m5208_rcm_ops, cpu,
+                          "m5208-rcm", 0x00000080);
+    memory_region_add_subregion(address_space, 0xfc0a0000, iomem_rcm);
     /* SDRAMC.  */
     memory_region_init_io(iomem, NULL, &m5208_sys_ops, NULL, "m5208-sys", 0x00004000);
     memory_region_add_subregion(address_space, 0xfc0a8000, iomem);
@@ -265,7 +305,7 @@ static void mcf5208evb_init(MachineState *machine)
     mcf_uart_create_mmap(0xfc064000, pic[27], serial_hd(1));
     mcf_uart_create_mmap(0xfc068000, pic[28], serial_hd(2));
 
-    mcf5208_sys_init(address_space_mem, pic);
+    mcf5208_sys_init(address_space_mem, pic, cpu);
 
     mcf_fec_init(address_space_mem, 0xfc030000, pic + 36);