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imx8: add iomux configuration api

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Add iomux configuration api.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
Reviewed-by: Anatolij Gustschin <agust@denx.de>
Cc: Stefano Babic <sbabic@denx.de>
This commit is contained in:
Peng Fan 2018-10-18 14:28:25 +02:00 • committed by Stefano Babic
parent 2fdb1a1df9
commit abeebc19db
3 changed files with 84 additions and 1 deletions
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40
arch/arm/include/asm/arch-imx8/iomux.h Normal file
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/* SPDX-License-Identifier: GPL-2.0+ */
/*
* Copyright 2018 NXP
*/
#ifndef __ASM_ARCH_IMX8_IOMUX_H__
#define __ASM_ARCH_IMX8_IOMUX_H__
/*
* We use 64bits value for iomux settings.
* High 32bits are used for padring register value,
* low 16bits are used for pin index.
*/
typedef u64 iomux_cfg_t;
#define PADRING_IFMUX_EN_SHIFT 31
#define PADRING_IFMUX_EN_MASK BIT(31)
#define PADRING_GP_EN_SHIFT 30
#define PADRING_GP_EN_MASK BIT(30)
#define PADRING_IFMUX_SHIFT 27
#define PADRING_IFMUX_MASK GENMASK(29, 27)
#define PADRING_CONFIG_SHIFT 25
#define PADRING_LPCONFIG_SHIFT 23
#define PADRING_PULL_SHIFT 5
#define PADRING_DSE_SHIFT 0
#define MUX_PAD_CTRL_SHIFT 32
#define MUX_PAD_CTRL_MASK ((iomux_cfg_t)0xFFFFFFFF << MUX_PAD_CTRL_SHIFT)
#define MUX_PAD_CTRL(x) ((iomux_cfg_t)(x) << MUX_PAD_CTRL_SHIFT)
#define MUX_MODE_SHIFT (PADRING_IFMUX_SHIFT + MUX_PAD_CTRL_SHIFT)
#define MUX_MODE_MASK ((iomux_cfg_t)0x7 << MUX_MODE_SHIFT)
#define PIN_ID_MASK ((iomux_cfg_t)0xFFFF)
/* Valid mux alt0 to alt7 */
#define MUX_MODE_ALT(x) (((iomux_cfg_t)(x) << MUX_MODE_SHIFT) & \
MUX_MODE_MASK)
void imx8_iomux_setup_pad(iomux_cfg_t pad);
void imx8_iomux_setup_multiple_pads(iomux_cfg_t const *pad_list, u32 count);
#endif /* __ASM_ARCH_IMX8_IOMUX_H__ */

2
arch/arm/mach-imx/imx8/Makefile
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@ -4,4 +4,4 @@
# SPDX-License-Identifier: GPL-2.0+
#
obj-y += cpu.o
obj-y += cpu.o iomux.o

43
arch/arm/mach-imx/imx8/iomux.c Normal file
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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright 2018 NXP
*/
#include <common.h>
#include <asm/io.h>
#include <asm/arch/iomux.h>
#include <asm/arch/sci/sci.h>
DECLARE_GLOBAL_DATA_PTR;
/*
* configures a single pad in the iomuxer
*/
void imx8_iomux_setup_pad(iomux_cfg_t pad)
{
sc_pad_t pin_id = pad & PIN_ID_MASK;
int ret;
u32 val = (u32)((pad & MUX_PAD_CTRL_MASK) >> MUX_PAD_CTRL_SHIFT);
val |= PADRING_IFMUX_EN_MASK;
val |= PADRING_GP_EN_MASK;
ret = sc_pad_set(-1, pin_id, val);
if (ret)
printf("sc_pad_set failed!, pin: %u, val: 0x%x\n", pin_id, val);
debug("iomux: pin %d, val = 0x%x\n", pin_id, val);
}
/* configures a list of pads within declared with IOMUX_PADS macro */
void imx8_iomux_setup_multiple_pads(iomux_cfg_t const *pad_list, u32 count)
{
iomux_cfg_t const *p = pad_list;
int i;
for (i = 0; i < count; i++) {
imx8_iomux_setup_pad(*p);
p++;
}
}