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 <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 */ 42 int 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 mxs_register_32 *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 mxs_register_32 *)(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 mxs_register_32 *)(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 95 int 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 } 110