Merge tag 'v2.6.38' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6

[mv-sheeva.git] / arch / arm / mach-mxs / iomux.c

diff --git a/arch/arm/mach-mxs/iomux.c b/arch/arm/mach-mxs/iomux.c
new file mode 100644 (file)
index 0000000..0e804e2
--- /dev/null
+++ b/arch/arm/mach-mxs/iomux.c
@@ -0,0 +1,101 @@
+/*
+ * Copyright 2004-2006,2010 Freescale Semiconductor, Inc. All Rights Reserved.
+ * Copyright (C) 2008 by Sascha Hauer <kernel@pengutronix.de>
+ * Copyright (C) 2009 by Jan Weitzel Phytec Messtechnik GmbH,
+ *                       <armlinux@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., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301, USA.
+ */
+
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/string.h>
+#include <linux/gpio.h>
+
+#include <asm/mach/map.h>
+
+#include <mach/mxs.h>
+#include <mach/iomux.h>
+
+/*
+ * configures a single pad in the iomuxer
+ */
+int mxs_iomux_setup_pad(iomux_cfg_t pad)
+{
+       u32 reg, ofs, bp, bm;
+       void __iomem *iomux_base = MXS_IO_ADDRESS(MXS_PINCTRL_BASE_ADDR);
+
+       /* muxsel */
+       ofs = 0x100;
+       ofs += PAD_BANK(pad) * 0x20 + PAD_PIN(pad) / 16 * 0x10;
+       bp = PAD_PIN(pad) % 16 * 2;
+       bm = 0x3 << bp;
+       reg = __raw_readl(iomux_base + ofs);
+       reg &= ~bm;
+       reg |= PAD_MUXSEL(pad) << bp;
+       __raw_writel(reg, iomux_base + ofs);
+
+       /* drive */
+       ofs = cpu_is_mx23() ? 0x200 : 0x300;
+       ofs += PAD_BANK(pad) * 0x40 + PAD_PIN(pad) / 8 * 0x10;
+       /* mA */
+       if (PAD_MA_VALID(pad)) {
+               bp = PAD_PIN(pad) % 8 * 4;
+               bm = 0x3 << bp;
+               reg = __raw_readl(iomux_base + ofs);
+               reg &= ~bm;
+               reg |= PAD_MA(pad) << bp;
+               __raw_writel(reg, iomux_base + ofs);
+       }
+       /* vol */
+       if (PAD_VOL_VALID(pad)) {
+               bp = PAD_PIN(pad) % 8 * 4 + 2;
+               if (PAD_VOL(pad))
+                       __mxs_setl(1 << bp, iomux_base + ofs);
+               else
+                       __mxs_clrl(1 << bp, iomux_base + ofs);
+       }
+
+       /* pull */
+       if (PAD_PULL_VALID(pad)) {
+               ofs = cpu_is_mx23() ? 0x400 : 0x600;
+               ofs += PAD_BANK(pad) * 0x10;
+               bp = PAD_PIN(pad);
+               if (PAD_PULL(pad))
+                       __mxs_setl(1 << bp, iomux_base + ofs);
+               else
+                       __mxs_clrl(1 << bp, iomux_base + ofs);
+       }
+
+       return 0;
+}
+
+int mxs_iomux_setup_multiple_pads(const iomux_cfg_t *pad_list, unsigned count)
+{
+       const iomux_cfg_t *p = pad_list;
+       int i;
+       int ret;
+
+       for (i = 0; i < count; i++) {
+               ret = mxs_iomux_setup_pad(*p);
+               if (ret)
+                       return ret;
+               p++;
+       }
+
+       return 0;
+}