hw/omap2.c : separate synctimer module

Signed-off-by: cmchao <cmchao@gmail.com>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>

1 files changed, 96 insertions, 0 deletions

diff --git a/hw/omap_synctimer.c b/hw/omap_synctimer.c
new file mode 100644
index 0000000000..118668aead
--- /dev/null
+++ b/hw/omap_synctimer.c
@@ -0,0 +1,96 @@
+/*
+ * TI OMAP2 32kHz sync timer emulation.
+ *
+ * Copyright (C) 2007-2008 Nokia Corporation
+ * Written by Andrzej Zaborowski <andrew@openedhand.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 or
+ * (at your option) any later version of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+#include "hw.h"
+#include "qemu-timer.h"
+#include "omap.h"
+struct omap_synctimer_s {
+    uint32_t val;
+    uint16_t readh;
+};
+
+/* 32-kHz Sync Timer of the OMAP2 */
+static uint32_t omap_synctimer_read(struct omap_synctimer_s *s) {
+    return muldiv64(qemu_get_clock(vm_clock), 0x8000, get_ticks_per_sec());
+}
+
+void omap_synctimer_reset(struct omap_synctimer_s *s)
+{
+    s->val = omap_synctimer_read(s);
+}
+
+static uint32_t omap_synctimer_readw(void *opaque, target_phys_addr_t addr)
+{
+    struct omap_synctimer_s *s = (struct omap_synctimer_s *) opaque;
+
+    switch (addr) {
+    case 0x00:	/* 32KSYNCNT_REV */
+        return 0x21;
+
+    case 0x10:	/* CR */
+        return omap_synctimer_read(s) - s->val;
+    }
+
+    OMAP_BAD_REG(addr);
+    return 0;
+}
+
+static uint32_t omap_synctimer_readh(void *opaque, target_phys_addr_t addr)
+{
+    struct omap_synctimer_s *s = (struct omap_synctimer_s *) opaque;
+    uint32_t ret;
+
+    if (addr & 2)
+        return s->readh;
+    else {
+        ret = omap_synctimer_readw(opaque, addr);
+        s->readh = ret >> 16;
+        return ret & 0xffff;
+    }
+}
+
+static CPUReadMemoryFunc * const omap_synctimer_readfn[] = {
+    omap_badwidth_read32,
+    omap_synctimer_readh,
+    omap_synctimer_readw,
+};
+
+static void omap_synctimer_write(void *opaque, target_phys_addr_t addr,
+                uint32_t value)
+{
+    OMAP_BAD_REG(addr);
+}
+
+static CPUWriteMemoryFunc * const omap_synctimer_writefn[] = {
+    omap_badwidth_write32,
+    omap_synctimer_write,
+    omap_synctimer_write,
+};
+
+struct omap_synctimer_s *omap_synctimer_init(struct omap_target_agent_s *ta,
+                struct omap_mpu_state_s *mpu, omap_clk fclk, omap_clk iclk)
+{
+    struct omap_synctimer_s *s = qemu_mallocz(sizeof(*s));
+
+    omap_synctimer_reset(s);
+    omap_l4_attach(ta, 0, l4_register_io_memory(
+                      omap_synctimer_readfn, omap_synctimer_writefn, s));
+
+    return s;
+}