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 * SPDX-License-Identifier: GPL-2.0+ 8 */ 9 10 #include <common.h> 11 #include <linux/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 */ 30 int mxs_iomux_setup_pad(iomux_cfg_t pad) 31 { 32 u32 reg, ofs, bp, bm; 33 void *iomux_base = (void *)MXS_PINCTRL_BASE; 34 struct mxs_register_32 *mxs_reg; 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; 61 mxs_reg = (struct mxs_register_32 *)(iomux_base + ofs); 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); 73 mxs_reg = (struct mxs_register_32 *)(iomux_base + ofs); 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 83 int 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 } 98