MXC: Add a digital audio multiplexer driver

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

5 files changed, 188 insertions, 0 deletions

diff --git a/arch/arm/plat-mxc/Kconfig b/arch/arm/plat-mxc/Kconfig
index e8e92cbd108c..8b0a1ee039fa 100644
--- a/arch/arm/plat-mxc/Kconfig
+++ b/arch/arm/plat-mxc/Kconfig
@@ -78,4 +78,11 @@ config ARCH_HAS_RNGA
 
 config ARCH_MXC_IOMUX_V3
         bool
+
+config ARCH_MXC_AUDMUX_V1
+        bool
+
+config ARCH_MXC_AUDMUX_V2
+        bool
+
 endif
diff --git a/arch/arm/plat-mxc/Makefile b/arch/arm/plat-mxc/Makefile
index 545412f81831..4cbca9da1505 100644
--- a/arch/arm/plat-mxc/Makefile
+++ b/arch/arm/plat-mxc/Makefile
@@ -10,3 +10,5 @@ obj-$(CONFIG_ARCH_MX2) += iomux-mx1-mx2.o dma-mx1-mx2.o
 obj-$(CONFIG_ARCH_MXC_IOMUX_V3) += iomux-v3.o
 obj-$(CONFIG_MXC_PWM)  += pwm.o
 obj-$(CONFIG_MXC_ULPI) += ulpi.o
+obj-$(CONFIG_ARCH_MXC_AUDMUX_V1) += audmux-v1.o
+obj-$(CONFIG_ARCH_MXC_AUDMUX_V2) += audmux-v2.o
diff --git a/arch/arm/plat-mxc/audmux-v1.c b/arch/arm/plat-mxc/audmux-v1.c
new file mode 100644
index 000000000000..70ab5aff2b9e
--- /dev/null
+++ b/arch/arm/plat-mxc/audmux-v1.c
@@ -0,0 +1,53 @@
+/*
+ * 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 void __iomem *audmux_base;
+
+#define MXC_AUDMUX_V1_PCR(x)    ((x) * 4)
+
+int mxc_audmux_v1_configure_port(unsigned int port, unsigned int pcr)
+{
+        if (!audmux_base) {
+                printk("%s: not configured\n", __func__);
+                return -ENOSYS;
+        }
+
+        writel(pcr, audmux_base + MXC_AUDMUX_V1_PCR(port));
+
+        return 0;
+}
+EXPORT_SYMBOL_GPL(mxc_audmux_v1_configure_port);
+
+static int mxc_audmux_v1_init(void)
+{
+        if (cpu_is_mx27() || cpu_is_mx21())
+                audmux_base = IO_ADDRESS(AUDMUX_BASE_ADDR);
+        return 0;
+}
+
+postcore_initcall(mxc_audmux_v1_init);
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);
diff --git a/arch/arm/plat-mxc/include/mach/audmux.h b/arch/arm/plat-mxc/include/mach/audmux.h
new file mode 100644
index 000000000000..5cd6466964af
--- /dev/null
+++ b/arch/arm/plat-mxc/include/mach/audmux.h
@@ -0,0 +1,52 @@
+#ifndef __MACH_AUDMUX_H
+#define __MACH_AUDMUX_H
+
+#define MX27_AUDMUX_HPCR1_SSI0          0
+#define MX27_AUDMUX_HPCR2_SSI1          1
+#define MX27_AUDMUX_HPCR3_SSI_PINS_4    2
+#define MX27_AUDMUX_PPCR1_SSI_PINS_1    3
+#define MX27_AUDMUX_PPCR2_SSI_PINS_2    4
+#define MX27_AUDMUX_PPCR3_SSI_PINS_3    5
+
+#define MX31_AUDMUX_PORT1_SSI0          0
+#define MX31_AUDMUX_PORT2_SSI1          1
+#define MX31_AUDMUX_PORT3_SSI_PINS_3    2
+#define MX31_AUDMUX_PORT4_SSI_PINS_4    3
+#define MX31_AUDMUX_PORT5_SSI_PINS_5    4
+#define MX31_AUDMUX_PORT6_SSI_PINS_6    5
+
+/* Register definitions for the i.MX21/27 Digital Audio Multiplexer */
+#define MXC_AUDMUX_V1_PCR_INMMASK(x)    ((x) & 0xff)
+#define MXC_AUDMUX_V1_PCR_INMEN         (1 << 8)
+#define MXC_AUDMUX_V1_PCR_TXRXEN        (1 << 10)
+#define MXC_AUDMUX_V1_PCR_SYN           (1 << 12)
+#define MXC_AUDMUX_V1_PCR_RXDSEL(x)     (((x) & 0x7) << 13)
+#define MXC_AUDMUX_V1_PCR_RFCSEL(x)     (((x) & 0xf) << 20)
+#define MXC_AUDMUX_V1_PCR_RCLKDIR       (1 << 24)
+#define MXC_AUDMUX_V1_PCR_RFSDIR        (1 << 25)
+#define MXC_AUDMUX_V1_PCR_TFCSEL(x)     (((x) & 0xf) << 26)
+#define MXC_AUDMUX_V1_PCR_TCLKDIR       (1 << 30)
+#define MXC_AUDMUX_V1_PCR_TFSDIR        (1 << 31)
+
+/* Register definitions for the i.MX25/31/35 Digital Audio Multiplexer */
+#define MXC_AUDMUX_V2_PTCR_TFSDIR       (1 << 31)
+#define MXC_AUDMUX_V2_PTCR_TFSEL(x)     (((x) & 0xf) << 27)
+#define MXC_AUDMUX_V2_PTCR_TCLKDIR      (1 << 26)
+#define MXC_AUDMUX_V2_PTCR_TCSEL(x)     (((x) & 0xf) << 22)
+#define MXC_AUDMUX_V2_PTCR_RFSDIR       (1 << 21)
+#define MXC_AUDMUX_V2_PTCR_RFSEL(x)     (((x) & 0xf) << 17)
+#define MXC_AUDMUX_V2_PTCR_RCLKDIR      (1 << 16)
+#define MXC_AUDMUX_V2_PTCR_RCSEL(x)     (((x) & 0xf) << 12)
+#define MXC_AUDMUX_V2_PTCR_SYN          (1 << 11)
+
+#define MXC_AUDMUX_V2_PDCR_RXDSEL(x)    (((x) & 0x7) << 13)
+#define MXC_AUDMUX_V2_PDCR_TXRXEN       (1 << 12)
+#define MXC_AUDMUX_V2_PDCR_MODE(x)      (((x) & 0x3) << 8)
+#define MXC_AUDMUX_V2_PDCR_INMMASK(x)   ((x) & 0xff)
+
+int mxc_audmux_v1_configure_port(unsigned int port, unsigned int pcr);
+
+int mxc_audmux_v2_configure_port(unsigned int port, unsigned int ptcr,
+                unsigned int pdcr);
+
+#endif /* __MACH_AUDMUX_H */