kernel: isa: Add pcspkr support

Signed-off-by: Ian Moffett <ian@osmora.org>

1 files changed, 68 insertions, 0 deletions

diff --git a/sys/arch/amd64/isa/spkr.c b/sys/arch/amd64/isa/spkr.c
new file mode 100644
index 0000000..109054e
--- /dev/null
+++ b/sys/arch/amd64/isa/spkr.c
@@ -0,0 +1,68 @@
+/*
+ * Copyright (c) 2023-2024 Ian Marco Moffett and the Osmora Team.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of Hyra nor the names of its
+ *    contributors may be used to endorse or promote products derived from
+ *    this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+#include <sys/timer.h>
+#include <sys/errno.h>
+#include <machine/isa/spkr.h>
+#include <machine/isa/i8254.h>
+#include <machine/io.h>
+
+#define DIVIDEND 1193180
+#define CTRL_PORT 0x61
+
+int
+pcspkr_tone(uint16_t freq, uint32_t msec)
+{
+    uint32_t divisor;
+    uint8_t tmp;
+    struct timer tmr;
+
+    if (req_timer(TIMER_GP, &tmr) != TMRR_SUCCESS)
+        return -ENOTSUP;
+    if (__unlikely(tmr.msleep == NULL))
+        return -ENOTSUP;
+
+    divisor = DIVIDEND / freq;
+    outb(i8254_COMMAND, 0xB6);
+    outb(i8254_CHANNEL_2, divisor & 0xFF);
+    outb(i8254_CHANNEL_2, (divisor >> 8) & 0xFF);
+
+    /* Oscillate the speaker */
+    tmp = inb(CTRL_PORT);
+    if (!__TEST(tmp, 3)) {
+        tmp |= 3;
+        outb(CTRL_PORT, tmp);
+    }
+
+    /* Sleep then turn off the speaker */
+    tmr.msleep(msec);
+    outb(CTRL_PORT, tmp & ~3);
+    return 0;
+}