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bf985969 SG |
1 | /* |
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 <linux/errno.h> | |
23 | #include <linux/init.h> | |
24 | #include <linux/kernel.h> | |
25 | #include <linux/module.h> | |
26 | #include <linux/string.h> | |
27 | #include <linux/gpio.h> | |
28 | ||
29 | #include <asm/mach/map.h> | |
30 | ||
31 | #include <mach/mxs.h> | |
32 | #include <mach/iomux.h> | |
33 | ||
34 | /* | |
35 | * configures a single pad in the iomuxer | |
36 | */ | |
37 | int mxs_iomux_setup_pad(iomux_cfg_t pad) | |
38 | { | |
39 | u32 reg, ofs, bp, bm; | |
40 | void __iomem *iomux_base = MXS_IO_ADDRESS(MXS_PINCTRL_BASE_ADDR); | |
41 | ||
42 | /* muxsel */ | |
43 | ofs = 0x100; | |
44 | ofs += PAD_BANK(pad) * 0x20 + PAD_PIN(pad) / 16 * 0x10; | |
45 | bp = PAD_PIN(pad) % 16 * 2; | |
46 | bm = 0x3 << bp; | |
47 | reg = __raw_readl(iomux_base + ofs); | |
48 | reg &= ~bm; | |
49 | reg |= PAD_MUXSEL(pad) << bp; | |
50 | __raw_writel(reg, iomux_base + ofs); | |
51 | ||
52 | /* drive */ | |
53 | ofs = cpu_is_mx23() ? 0x200 : 0x300; | |
54 | ofs += PAD_BANK(pad) * 0x40 + PAD_PIN(pad) / 8 * 0x10; | |
55 | /* mA */ | |
56 | if (PAD_MA_VALID(pad)) { | |
57 | bp = PAD_PIN(pad) % 8 * 4; | |
58 | bm = 0x3 << bp; | |
59 | reg = __raw_readl(iomux_base + ofs); | |
60 | reg &= ~bm; | |
61 | reg |= PAD_MA(pad) << bp; | |
62 | __raw_writel(reg, iomux_base + ofs); | |
63 | } | |
64 | /* vol */ | |
65 | if (PAD_VOL_VALID(pad)) { | |
66 | bp = PAD_PIN(pad) % 8 * 4 + 2; | |
67 | if (PAD_VOL(pad)) | |
68 | __mxs_setl(1 << bp, iomux_base + ofs); | |
69 | else | |
70 | __mxs_clrl(1 << bp, iomux_base + ofs); | |
71 | } | |
72 | ||
73 | /* pull */ | |
74 | if (PAD_PULL_VALID(pad)) { | |
75 | ofs = cpu_is_mx23() ? 0x400 : 0x600; | |
76 | ofs += PAD_BANK(pad) * 0x10; | |
77 | bp = PAD_PIN(pad); | |
78 | if (PAD_PULL(pad)) | |
79 | __mxs_setl(1 << bp, iomux_base + ofs); | |
80 | else | |
81 | __mxs_clrl(1 << bp, iomux_base + ofs); | |
82 | } | |
83 | ||
84 | return 0; | |
85 | } | |
86 | ||
87 | int mxs_iomux_setup_multiple_pads(const iomux_cfg_t *pad_list, unsigned count) | |
88 | { | |
89 | const iomux_cfg_t *p = pad_list; | |
90 | int i; | |
91 | int ret; | |
92 | ||
93 | for (i = 0; i < count; i++) { | |
94 | ret = mxs_iomux_setup_pad(*p); | |
95 | if (ret) | |
96 | return ret; | |
97 | p++; | |
98 | } | |
99 | ||
100 | return 0; | |
101 | } |