From 9eedbdf1b4216e286bd660322ae5a52f79eee243 Mon Sep 17 00:00:00 2001 From: Sascha Hauer Date: Thu, 29 Oct 2009 17:12:39 +0100 Subject: MXC: Add a digital audio multiplexer driver Signed-off-by: Sascha Hauer --- arch/arm/plat-mxc/audmux-v2.c | 74 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 74 insertions(+) create mode 100644 arch/arm/plat-mxc/audmux-v2.c (limited to 'arch/arm/plat-mxc/audmux-v2.c') diff --git a/arch/arm/plat-mxc/audmux-v2.c b/arch/arm/plat-mxc/audmux-v2.c new file mode 100644 index 0000000..6f21096 --- /dev/null +++ b/arch/arm/plat-mxc/audmux-v2.c @@ -0,0 +1,74 @@ +/* + * Copyright 2009 Pengutronix, Sascha Hauer + * + * 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 +#include +#include +#include +#include +#include + +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); -- cgit v1.1