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Marek Vasutb473ec52011-11-08 23:18:11 +00001/*
2 * Copyright 2004-2006,2010 Freescale Semiconductor, Inc. All Rights Reserved.
3 * Copyright (C) 2008 by Sascha Hauer <kernel@pengutronix.de>
4 * Copyright (C) 2009 by Jan Weitzel Phytec Messtechnik GmbH,
5 * <armlinux@phytec.de>
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version 2
10 * of the License, or (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
19 * MA 02110-1301, USA.
20 */
21
22#include <common.h>
23#include <asm/errno.h>
24#include <asm/io.h>
25#include <asm/arch/clock.h>
26#include <asm/arch/iomux.h>
27#include <asm/arch/imx-regs.h>
28
29#if defined(CONFIG_MX23)
30#define DRIVE_OFFSET 0x200
31#define PULL_OFFSET 0x400
32#elif defined(CONFIG_MX28)
33#define DRIVE_OFFSET 0x300
34#define PULL_OFFSET 0x600
35#else
36#error "Please select CONFIG_MX23 or CONFIG_MX28"
37#endif
38
39/*
40 * configures a single pad in the iomuxer
41 */
42int mxs_iomux_setup_pad(iomux_cfg_t pad)
43{
44 u32 reg, ofs, bp, bm;
45 void *iomux_base = (void *)MXS_PINCTRL_BASE;
46 struct mx28_register *mxs_reg;
47
48 /* muxsel */
49 ofs = 0x100;
50 ofs += PAD_BANK(pad) * 0x20 + PAD_PIN(pad) / 16 * 0x10;
51 bp = PAD_PIN(pad) % 16 * 2;
52 bm = 0x3 << bp;
53 reg = readl(iomux_base + ofs);
54 reg &= ~bm;
55 reg |= PAD_MUXSEL(pad) << bp;
56 writel(reg, iomux_base + ofs);
57
58 /* drive */
59 ofs = DRIVE_OFFSET;
60 ofs += PAD_BANK(pad) * 0x40 + PAD_PIN(pad) / 8 * 0x10;
61 /* mA */
62 if (PAD_MA_VALID(pad)) {
63 bp = PAD_PIN(pad) % 8 * 4;
64 bm = 0x3 << bp;
65 reg = readl(iomux_base + ofs);
66 reg &= ~bm;
67 reg |= PAD_MA(pad) << bp;
68 writel(reg, iomux_base + ofs);
69 }
70 /* vol */
71 if (PAD_VOL_VALID(pad)) {
72 bp = PAD_PIN(pad) % 8 * 4 + 2;
73 mxs_reg = (struct mx28_register *)(iomux_base + ofs);
74 if (PAD_VOL(pad))
75 writel(1 << bp, &mxs_reg->reg_set);
76 else
77 writel(1 << bp, &mxs_reg->reg_clr);
78 }
79
80 /* pull */
81 if (PAD_PULL_VALID(pad)) {
82 ofs = PULL_OFFSET;
83 ofs += PAD_BANK(pad) * 0x10;
84 bp = PAD_PIN(pad);
85 mxs_reg = (struct mx28_register *)(iomux_base + ofs);
86 if (PAD_PULL(pad))
87 writel(1 << bp, &mxs_reg->reg_set);
88 else
89 writel(1 << bp, &mxs_reg->reg_clr);
90 }
91
92 return 0;
93}
94
95int mxs_iomux_setup_multiple_pads(const iomux_cfg_t *pad_list, unsigned count)
96{
97 const iomux_cfg_t *p = pad_list;
98 int i;
99 int ret;
100
101 for (i = 0; i < count; i++) {
102 ret = mxs_iomux_setup_pad(*p);
103 if (ret)
104 return ret;
105 p++;
106 }
107
108 return 0;
109}