| Shawn Guo | bf98596 | 2010-12-20 22:57:43 +0800 | [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 | * |
| 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 | } |