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gerrit.cesnet.cz / github / trini / u-boot / 2cc1aa2e0010249fe671e38eb412d0cbefb0bf73 / . / arch / arm / cpu / arm926ejs / mxs / iomux.c
blob: 2e6be06fd4862489609ad86307b2a084fd70a4bf [file] [log] [blame]
Marek Vasutd91a6722011-11-08 23:18:11 +0000[diff] [blame]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 *
Wolfgang Denk1a459662013-07-08 09:37:19 +0200[diff] [blame]7 * SPDX-License-Identifier: GPL-2.0+
Marek Vasutd91a6722011-11-08 23:18:11 +0000[diff] [blame]8 */
9
10#include <common.h>
11#include <asm/errno.h>
12#include <asm/io.h>
13#include <asm/arch/clock.h>
14#include <asm/arch/iomux.h>
15#include <asm/arch/imx-regs.h>
16
17#if defined(CONFIG_MX23)
18#define DRIVE_OFFSET 0x200
19#define PULL_OFFSET 0x400
20#elif defined(CONFIG_MX28)
21#define DRIVE_OFFSET 0x300
22#define PULL_OFFSET 0x600
23#else
24#error "Please select CONFIG_MX23 or CONFIG_MX28"
25#endif
26
27/*
28 * configures a single pad in the iomuxer
29 */
30int mxs_iomux_setup_pad(iomux_cfg_t pad)
31{
32 u32 reg, ofs, bp, bm;
33 void *iomux_base = (void *)MXS_PINCTRL_BASE;
Otavio Salvadorddcf13b2012-08-05 09:05:30 +0000[diff] [blame]34 struct mxs_register_32 *mxs_reg;
Marek Vasutd91a6722011-11-08 23:18:11 +0000[diff] [blame]35
36 /* muxsel */
37 ofs = 0x100;
38 ofs += PAD_BANK(pad) * 0x20 + PAD_PIN(pad) / 16 * 0x10;
39 bp = PAD_PIN(pad) % 16 * 2;
40 bm = 0x3 << bp;
41 reg = readl(iomux_base + ofs);
42 reg &= ~bm;
43 reg |= PAD_MUXSEL(pad) << bp;
44 writel(reg, iomux_base + ofs);
45
46 /* drive */
47 ofs = DRIVE_OFFSET;
48 ofs += PAD_BANK(pad) * 0x40 + PAD_PIN(pad) / 8 * 0x10;
49 /* mA */
50 if (PAD_MA_VALID(pad)) {
51 bp = PAD_PIN(pad) % 8 * 4;
52 bm = 0x3 << bp;
53 reg = readl(iomux_base + ofs);
54 reg &= ~bm;
55 reg |= PAD_MA(pad) << bp;
56 writel(reg, iomux_base + ofs);
57 }
58 /* vol */
59 if (PAD_VOL_VALID(pad)) {
60 bp = PAD_PIN(pad) % 8 * 4 + 2;
Otavio Salvadorddcf13b2012-08-05 09:05:30 +0000[diff] [blame]61 mxs_reg = (struct mxs_register_32 *)(iomux_base + ofs);
Marek Vasutd91a6722011-11-08 23:18:11 +0000[diff] [blame]62 if (PAD_VOL(pad))
63 writel(1 << bp, &mxs_reg->reg_set);
64 else
65 writel(1 << bp, &mxs_reg->reg_clr);
66 }
67
68 /* pull */
69 if (PAD_PULL_VALID(pad)) {
70 ofs = PULL_OFFSET;
71 ofs += PAD_BANK(pad) * 0x10;
72 bp = PAD_PIN(pad);
Otavio Salvadorddcf13b2012-08-05 09:05:30 +0000[diff] [blame]73 mxs_reg = (struct mxs_register_32 *)(iomux_base + ofs);
Marek Vasutd91a6722011-11-08 23:18:11 +0000[diff] [blame]74 if (PAD_PULL(pad))
75 writel(1 << bp, &mxs_reg->reg_set);
76 else
77 writel(1 << bp, &mxs_reg->reg_clr);
78 }
79
80 return 0;
81}
82
83int mxs_iomux_setup_multiple_pads(const iomux_cfg_t *pad_list, unsigned count)
84{
85 const iomux_cfg_t *p = pad_list;
86 int i;
87 int ret;
88
89 for (i = 0; i < count; i++) {
90 ret = mxs_iomux_setup_pad(*p);
91 if (ret)
92 return ret;
93 p++;
94 }
95
96 return 0;
97}