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-rw-r--r--cpu/at32ap/device.c126
1 files changed, 126 insertions, 0 deletions
diff --git a/cpu/at32ap/device.c b/cpu/at32ap/device.c
new file mode 100644
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--- /dev/null
+++ b/cpu/at32ap/device.c
@@ -0,0 +1,126 @@
+/*
+ * Copyright (C) 2006 Atmel Corporation
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * 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 of
+ * the License, or (at your option) any later version.
+ *
+ * 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, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+#include <common.h>
+
+#include <asm/arch/platform.h>
+
+#include "sm.h"
+
+struct device_state {
+ int refcount;
+};
+
+static struct device_state device_state[NR_DEVICES];
+
+static int claim_resource(const struct resource *res)
+{
+ int ret = 0;
+
+ switch (res->type) {
+ case RESOURCE_GPIO:
+ ret = gpio_set_func(res->u.gpio.gpio_dev,
+ res->u.gpio.start,
+ res->u.gpio.nr_pins,
+ res->u.gpio.func);
+ break;
+ case RESOURCE_CLOCK:
+ ret = pm_enable_clock(res->u.clock.id, res->u.clock.index);
+ break;
+ }
+
+ return ret;
+}
+
+static void free_resource(const struct resource *res)
+{
+ switch (res->type) {
+ case RESOURCE_GPIO:
+ gpio_free(res->u.gpio.gpio_dev, res->u.gpio.start,
+ res->u.gpio.nr_pins);
+ break;
+ case RESOURCE_CLOCK:
+ pm_disable_clock(res->u.clock.id, res->u.clock.index);
+ break;
+ }
+}
+
+static int init_dev(const struct device *dev)
+{
+ unsigned int i;
+ int ret = 0;
+
+ for (i = 0; i < dev->nr_resources; i++) {
+ ret = claim_resource(&dev->resource[i]);
+ if (ret)
+ goto cleanup;
+ }
+
+ return 0;
+
+cleanup:
+ while (i--)
+ free_resource(&dev->resource[i]);
+
+ return ret;
+}
+
+const struct device *get_device(enum device_id devid)
+{
+ struct device_state *devstate;
+ const struct device *dev;
+ unsigned long flags;
+ int initialized = 0;
+ int ret = 0;
+
+ devstate = &device_state[devid];
+ dev = &chip_device[devid];
+
+ flags = disable_interrupts();
+ if (devstate->refcount++)
+ initialized = 1;
+ if (flags)
+ enable_interrupts();
+
+ if (!initialized)
+ ret = init_dev(dev);
+
+ return ret ? NULL : dev;
+}
+
+void put_device(const struct device *dev)
+{
+ struct device_state *devstate;
+ unsigned long devid, flags;
+
+ devid = (unsigned long)(dev - chip_device) / sizeof(struct device);
+ devstate = &device_state[devid];
+
+ flags = disable_interrupts();
+ devstate--;
+ if (!devstate) {
+ unsigned int i;
+ for (i = 0; i < dev->nr_resources; i++)
+ free_resource(&dev->resource[i]);
+ }
+ if (flags)
+ enable_interrupts();
+}