1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Copyright 2004-2006,2010 Freescale Semiconductor, Inc. All Rights Reserved. 4 * Copyright (C) 2008 by Sascha Hauer <kernel (at) pengutronix.de> 5 * Copyright (C) 2009 by Jan Weitzel Phytec Messtechnik GmbH, 6 * <armlinux (at) phytec.de> 7 */ 8 9 #include <common.h> 10 #include <linux/errno.h> 11 #include <asm/io.h> 12 #include <asm/arch/clock.h> 13 #include <asm/arch/iomux.h> 14 #include <asm/arch/imx-regs.h> 15 16 #if defined(CONFIG_MX23) 17 #define DRIVE_OFFSET 0x200 18 #define PULL_OFFSET 0x400 19 #elif defined(CONFIG_MX28) 20 #define DRIVE_OFFSET 0x300 21 #define PULL_OFFSET 0x600 22 #else 23 #error "Please select CONFIG_MX23 or CONFIG_MX28" 24 #endif 25 26 /* 27 * configures a single pad in the iomuxer 28 */ 29 int mxs_iomux_setup_pad(iomux_cfg_t pad) 30 { 31 u32 reg, ofs, bp, bm; 32 void *iomux_base = (void *)MXS_PINCTRL_BASE; 33 struct mxs_register_32 *mxs_reg; 34 35 /* muxsel */ 36 ofs = 0x100; 37 ofs += PAD_BANK(pad) * 0x20 + PAD_PIN(pad) / 16 * 0x10; 38 bp = PAD_PIN(pad) % 16 * 2; 39 bm = 0x3 << bp; 40 reg = readl(iomux_base + ofs); 41 reg &= ~bm; 42 reg |= PAD_MUXSEL(pad) << bp; 43 writel(reg, iomux_base + ofs); 44 45 /* drive */ 46 ofs = DRIVE_OFFSET; 47 ofs += PAD_BANK(pad) * 0x40 + PAD_PIN(pad) / 8 * 0x10; 48 /* mA */ 49 if (PAD_MA_VALID(pad)) { 50 bp = PAD_PIN(pad) % 8 * 4; 51 bm = 0x3 << bp; 52 reg = readl(iomux_base + ofs); 53 reg &= ~bm; 54 reg |= PAD_MA(pad) << bp; 55 writel(reg, iomux_base + ofs); 56 } 57 /* vol */ 58 if (PAD_VOL_VALID(pad)) { 59 bp = PAD_PIN(pad) % 8 * 4 + 2; 60 mxs_reg = (struct mxs_register_32 *)(iomux_base + ofs); 61 if (PAD_VOL(pad)) 62 writel(1 << bp, &mxs_reg->reg_set); 63 else 64 writel(1 << bp, &mxs_reg->reg_clr); 65 } 66 67 /* pull */ 68 if (PAD_PULL_VALID(pad)) { 69 ofs = PULL_OFFSET; 70 ofs += PAD_BANK(pad) * 0x10; 71 bp = PAD_PIN(pad); 72 mxs_reg = (struct mxs_register_32 *)(iomux_base + ofs); 73 if (PAD_PULL(pad)) 74 writel(1 << bp, &mxs_reg->reg_set); 75 else 76 writel(1 << bp, &mxs_reg->reg_clr); 77 } 78 79 return 0; 80 } 81 82 int mxs_iomux_setup_multiple_pads(const iomux_cfg_t *pad_list, unsigned count) 83 { 84 const iomux_cfg_t *p = pad_list; 85 int i; 86 int ret; 87 88 for (i = 0; i < count; i++) { 89 ret = mxs_iomux_setup_pad(*p); 90 if (ret) 91 return ret; 92 p++; 93 } 94 95 return 0; 96 } 97
