MXC: Add a digital audio multiplexer driver

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

1 files changed, 74 insertions, 0 deletions

diff --git a/arch/arm/plat-mxc/audmux-v2.c b/arch/arm/plat-mxc/audmux-v2.c
new file mode 100644
index 000000000000..6f21096086fd
--- /dev/null
+++ b/arch/arm/plat-mxc/audmux-v2.c
@@ -0,0 +1,74 @@
+/*
+ * Copyright 2009 Pengutronix, Sascha Hauer <s.hauer@pengutronix.de>
+ *
+ * Initial development of this code was funded by
+ * Phytec Messtechnik GmbH, http://www.phytec.de
+ *
+ * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/module.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/clk.h>
+#include <mach/audmux.h>
+#include <mach/hardware.h>
+
+static struct clk *audmux_clk;
+static void __iomem *audmux_base;
+
+#define MXC_AUDMUX_V2_PTCR(x)           ((x) * 8)
+#define MXC_AUDMUX_V2_PDCR(x)           ((x) * 8 + 4)
+
+int mxc_audmux_v2_configure_port(unsigned int port, unsigned int ptcr,
+                unsigned int pdcr)
+{
+        if (!audmux_base)
+                return -ENOSYS;
+
+        if (audmux_clk)
+                clk_enable(audmux_clk);
+
+        writel(ptcr, audmux_base + MXC_AUDMUX_V2_PTCR(port));
+        writel(pdcr, audmux_base + MXC_AUDMUX_V2_PDCR(port));
+
+        if (audmux_clk)
+                clk_disable(audmux_clk);
+
+        return 0;
+}
+EXPORT_SYMBOL_GPL(mxc_audmux_v2_configure_port);
+
+static int mxc_audmux_v2_init(void)
+{
+        int ret;
+
+        if (cpu_is_mx35()) {
+                audmux_clk = clk_get(NULL, "audmux");
+                if (IS_ERR(audmux_clk)) {
+                        ret = PTR_ERR(audmux_clk);
+                        printk(KERN_ERR "%s: cannot get clock: %d\n", __func__,
+                                        ret);
+                        return ret;
+                }
+        }
+
+        if (cpu_is_mx31() || cpu_is_mx35())
+                audmux_base = IO_ADDRESS(AUDMUX_BASE_ADDR);
+
+        return 0;
+}
+
+postcore_initcall(mxc_audmux_v2_init);