[PATCH v6 08/15] ARM: mxs: Add iomux support
Shawn Guo
shawn.guo at freescale.com
Mon Dec 13 07:55:02 EST 2010
MXS-based SoCs implements iomux functions in block PINCTRL.
Signed-off-by: Shawn Guo <shawn.guo at freescale.com>
Changes for v6:
- Use __mxs_setl() and __mxs_clrl() for bit set/clear
Changes for v5:
- Change iomux_cfg_t from u64 to u16
- Add namespace MXS_ to shift, mask, and pad definitions
- Use SET/CLR register for 1 bit setting
- Get "if" and "{" at the same line
- Remove space in middle of tabs
- Change "setups" to "configures" in comments
Changes for v3:
- Change iomux_cfg_t to u64 to facilitate adding platform specific
pad_ctrl settings to an existing pad definition
- Change inclusion of hardware.h to mxs.h
- Get iomux_base a hard-assignment in mxs_iomux_setup_pad(), since
mx23 and mx28 share the common pinctrl base adress and it's only
used in mxs_iomux_setup_pad().
- Remove EXPORT_SYMBOL and the static of mxs_iomux_setup_pad()
Changes for v2:
- Define iomux_cfg_t as u64
- Turn mxs_iomux_setup_pad() into a static function
- Fix a bug in mxs_iomux_setup_pad(), muxsel starts at offset 0x100 than 0 of pinctrl block.
---
arch/arm/mach-mxs/include/mach/iomux-mx23.h | 29 +++++++
arch/arm/mach-mxs/include/mach/iomux-mx28.h | 44 ++++++++++
arch/arm/mach-mxs/include/mach/iomux.h | 116 +++++++++++++++++++++++++++
arch/arm/mach-mxs/iomux.c | 99 +++++++++++++++++++++++
4 files changed, 288 insertions(+), 0 deletions(-)
create mode 100644 arch/arm/mach-mxs/include/mach/iomux-mx23.h
create mode 100644 arch/arm/mach-mxs/include/mach/iomux-mx28.h
create mode 100644 arch/arm/mach-mxs/include/mach/iomux.h
create mode 100644 arch/arm/mach-mxs/iomux.c
diff --git a/arch/arm/mach-mxs/include/mach/iomux-mx23.h b/arch/arm/mach-mxs/include/mach/iomux-mx23.h
new file mode 100644
index 0000000..5a316f4
--- /dev/null
+++ b/arch/arm/mach-mxs/include/mach/iomux-mx23.h
@@ -0,0 +1,29 @@
+/*
+ * Copyright (C) 2009-2010 Amit Kucheria <amit.kucheria at canonical.com>
+ * Copyright (C) 2010 Freescale Semiconductor, Inc.
+ *
+ * The code contained herein is licensed under the GNU General Public
+ * License. You may obtain a copy of the GNU General Public License
+ * Version 2 or later at the following locations:
+ *
+ * http://www.opensource.org/licenses/gpl-license.html
+ * http://www.gnu.org/copyleft/gpl.html
+ */
+
+#ifndef __MACH_IOMUX_MX23_H__
+#define __MACH_IOMUX_MX23_H__
+
+#include <mach/iomux.h>
+
+/*
+ * The naming convention for the pad modes is MX23_PAD_<padname>__<padmode>
+ * If <padname> or <padmode> refers to a GPIO, it is named GPIO_<unit>_<num>
+ * See also iomux.h
+ *
+ * BANK PIN MUX VOL MA PULL
+ */
+/* DUART */
+#define MX23_PAD_PWM0__DUART_RX MXS_IOMUX_PAD(1, 26, PAD_MUXSEL_2, PAD_VOL_NONE, PAD_4MA, PAD_NOPULL)
+#define MX23_PAD_PWM1__DUART_TX MXS_IOMUX_PAD(1, 27, PAD_MUXSEL_2, PAD_VOL_NONE, PAD_4MA, PAD_NOPULL)
+
+#endif /* __MACH_IOMUX_MX23_H__ */
diff --git a/arch/arm/mach-mxs/include/mach/iomux-mx28.h b/arch/arm/mach-mxs/include/mach/iomux-mx28.h
new file mode 100644
index 0000000..be8ad2d
--- /dev/null
+++ b/arch/arm/mach-mxs/include/mach/iomux-mx28.h
@@ -0,0 +1,44 @@
+/*
+ * Copyright (C) 2009-2010 Amit Kucheria <amit.kucheria at canonical.com>
+ * Copyright (C) 2010 Freescale Semiconductor, Inc.
+ *
+ * The code contained herein is licensed under the GNU General Public
+ * License. You may obtain a copy of the GNU General Public License
+ * Version 2 or later at the following locations:
+ *
+ * http://www.opensource.org/licenses/gpl-license.html
+ * http://www.gnu.org/copyleft/gpl.html
+ */
+
+#ifndef __MACH_IOMUX_MX28_H__
+#define __MACH_IOMUX_MX28_H__
+
+#include <mach/iomux.h>
+
+/*
+ * The naming convention for the pad modes is MX28_PAD_<padname>__<padmode>
+ * If <padname> or <padmode> refers to a GPIO, it is named GPIO_<unit>_<num>
+ * See also iomux.h
+ *
+ * BANK PIN MUX VOL MA PULL
+ */
+/* DUART */
+#define MX28_PAD_PWM0__DUART_RX MXS_IOMUX_PAD(3, 16, PAD_MUXSEL_2, PAD_3V3, PAD_4MA, PAD_NOPULL)
+#define MX28_PAD_PWM1__DUART_TX MXS_IOMUX_PAD(3, 17, PAD_MUXSEL_2, PAD_3V3, PAD_4MA, PAD_NOPULL)
+
+/* FEC */
+#define MX28_PAD_ENET0_MDC__ENET0_MDC MXS_IOMUX_PAD(4, 0, PAD_MUXSEL_0, PAD_3V3, PAD_8MA, PAD_PULLUP)
+#define MX28_PAD_ENET0_MDIO__ENET0_MDIO MXS_IOMUX_PAD(4, 1, PAD_MUXSEL_0, PAD_3V3, PAD_8MA, PAD_PULLUP)
+#define MX28_PAD_ENET0_RX_EN__ENET0_RX_EN MXS_IOMUX_PAD(4, 2, PAD_MUXSEL_0, PAD_3V3, PAD_8MA, PAD_PULLUP)
+#define MX28_PAD_ENET0_RXD0__ENET0_RXD0 MXS_IOMUX_PAD(4, 3, PAD_MUXSEL_0, PAD_3V3, PAD_8MA, PAD_PULLUP)
+#define MX28_PAD_ENET0_RXD1__ENET0_RXD1 MXS_IOMUX_PAD(4, 4, PAD_MUXSEL_0, PAD_3V3, PAD_8MA, PAD_PULLUP)
+#define MX28_PAD_ENET0_TX_EN__ENET0_TX_EN MXS_IOMUX_PAD(4, 6, PAD_MUXSEL_0, PAD_3V3, PAD_8MA, PAD_PULLUP)
+#define MX28_PAD_ENET0_TXD0__ENET0_TXD0 MXS_IOMUX_PAD(4, 7, PAD_MUXSEL_0, PAD_3V3, PAD_8MA, PAD_PULLUP)
+#define MX28_PAD_ENET0_TXD1__ENET0_TXD1 MXS_IOMUX_PAD(4, 8, PAD_MUXSEL_0, PAD_3V3, PAD_8MA, PAD_PULLUP)
+#define MX28_PAD_ENET_CLK__ENET_CLK MXS_IOMUX_PAD(4, 16, PAD_MUXSEL_0, PAD_3V3, PAD_8MA, PAD_PULLUP)
+
+/* GPIO */
+#define MX28_PAD_SSP1_DATA3__GPIO_2_15 MXS_IOMUX_PAD(2, 15, PAD_MUXSEL_GPIO, PAD_3V3, PAD_4MA, PAD_NOPULL)
+#define MX28_PAD_ENET0_RX_CLK__GPIO_4_13 MXS_IOMUX_PAD(4, 13, PAD_MUXSEL_GPIO, PAD_3V3, PAD_4MA, PAD_NOPULL)
+
+#endif /* __MACH_IOMUX_MX28_H__ */
diff --git a/arch/arm/mach-mxs/include/mach/iomux.h b/arch/arm/mach-mxs/include/mach/iomux.h
new file mode 100644
index 0000000..765b361
--- /dev/null
+++ b/arch/arm/mach-mxs/include/mach/iomux.h
@@ -0,0 +1,116 @@
+/*
+ * Copyright (C) 2009 by Jan Weitzel Phytec Messtechnik GmbH,
+ * <armlinux at phytec.de>
+ * Copyright (C) 2010 Freescale Semiconductor, Inc. All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301, USA.
+ */
+
+#ifndef __MACH_MXS_IOMUX_H__
+#define __MACH_MXS_IOMUX_H__
+
+/*
+ * IOMUX/PAD Bit field definitions
+ *
+ * PAD_BANK: 0..2 (3)
+ * PAD_PIN: 3..7 (5)
+ * PAD_MUXSEL: 8..9 (2)
+ * PAD_MA: 10..12 (3)
+ * PAD_VOL: 13..14 (2)
+ * PAD_PULL: 15 (1)
+ */
+typedef u16 iomux_cfg_t;
+
+#define MXS_PAD_BANK_SHIFT 0
+#define MXS_PAD_BANK_MASK ((iomux_cfg_t)0x7 << MXS_PAD_BANK_SHIFT)
+#define MXS_PAD_PIN_SHIFT 3
+#define MXS_PAD_PIN_MASK ((iomux_cfg_t)0x1f << MXS_PAD_PIN_SHIFT)
+#define MXS_PAD_MUXSEL_SHIFT 8
+#define MXS_PAD_MUXSEL_MASK ((iomux_cfg_t)0x3 << MXS_PAD_MUXSEL_SHIFT)
+#define MXS_PAD_MA_SHIFT 10
+#define MXS_PAD_MA_MASK ((iomux_cfg_t)0x7 << MXS_PAD_MA_SHIFT)
+#define MXS_PAD_VOL_SHIFT 13
+#define MXS_PAD_VOL_MASK ((iomux_cfg_t)0x3 << MXS_PAD_VOL_SHIFT)
+#define MXS_PAD_PULL_SHIFT 15
+#define MXS_PAD_PULL_MASK ((iomux_cfg_t)0x1 << MXS_PAD_PULL_SHIFT)
+
+#define MXS_IOMUX_PAD(_bank, _pin, _muxsel, _vol, _ma, _pull) \
+ (((iomux_cfg_t)(_bank) << MXS_PAD_BANK_SHIFT) | \
+ ((iomux_cfg_t)(_pin) << MXS_PAD_PIN_SHIFT) | \
+ ((iomux_cfg_t)(_muxsel) << MXS_PAD_MUXSEL_SHIFT) | \
+ ((iomux_cfg_t)(_vol) << MXS_PAD_VOL_SHIFT) | \
+ ((iomux_cfg_t)(_ma) << MXS_PAD_MA_SHIFT) | \
+ ((iomux_cfg_t)(_pull) << MXS_PAD_PULL_SHIFT))
+
+#define PAD_MUXSEL_0 0
+#define PAD_MUXSEL_1 1
+#define PAD_MUXSEL_2 2
+#define PAD_MUXSEL_GPIO 3
+
+#define PAD_1V8 0
+#define PAD_3V3 1
+#define PAD_VOL_NONE 2
+
+#define PAD_4MA 0
+#define PAD_8MA 1
+#define PAD_12MA 2
+#define PAD_16MA 3
+#define PAD_MA_NONE 4
+
+#define PAD_NOPULL 0
+#define PAD_PULLUP 1
+
+static inline unsigned int PAD_BANK(iomux_cfg_t pad)
+{
+ return (pad & MXS_PAD_BANK_MASK) >> MXS_PAD_BANK_SHIFT;
+}
+
+static inline unsigned int PAD_PIN(iomux_cfg_t pad)
+{
+ return (pad & MXS_PAD_PIN_MASK) >> MXS_PAD_PIN_SHIFT;
+}
+
+static inline unsigned int PAD_MUXSEL(iomux_cfg_t pad)
+{
+ return (pad & MXS_PAD_MUXSEL_MASK) >> MXS_PAD_MUXSEL_SHIFT;
+}
+
+static inline unsigned int PAD_MA(iomux_cfg_t pad)
+{
+ return (pad & MXS_PAD_MA_MASK) >> MXS_PAD_MA_SHIFT;
+}
+
+static inline unsigned int PAD_VOL(iomux_cfg_t pad)
+{
+ return (pad & MXS_PAD_VOL_MASK) >> MXS_PAD_VOL_SHIFT;
+}
+
+static inline unsigned int PAD_PULL(iomux_cfg_t pad)
+{
+ return (pad & MXS_PAD_PULL_MASK) >> MXS_PAD_PULL_SHIFT;
+}
+
+/*
+ * configures a single pad in the iomuxer
+ */
+int mxs_iomux_setup_pad(iomux_cfg_t pad);
+
+/*
+ * configures multiple pads
+ * convenient way to call the above function with tables
+ */
+int mxs_iomux_setup_multiple_pads(const iomux_cfg_t *pad_list, unsigned count);
+
+#endif /* __MACH_MXS_IOMUX_H__*/
diff --git a/arch/arm/mach-mxs/iomux.c b/arch/arm/mach-mxs/iomux.c
new file mode 100644
index 0000000..131908c
--- /dev/null
+++ b/arch/arm/mach-mxs/iomux.c
@@ -0,0 +1,99 @@
+/*
+ * Copyright 2004-2006,2010 Freescale Semiconductor, Inc. All Rights Reserved.
+ * Copyright (C) 2008 by Sascha Hauer <kernel at pengutronix.de>
+ * Copyright (C) 2009 by Jan Weitzel Phytec Messtechnik GmbH,
+ * <armlinux at phytec.de>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301, USA.
+ */
+
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/string.h>
+#include <linux/gpio.h>
+
+#include <asm/mach/map.h>
+
+#include <mach/mxs.h>
+#include <mach/iomux.h>
+
+/*
+ * configures a single pad in the iomuxer
+ */
+int mxs_iomux_setup_pad(iomux_cfg_t pad)
+{
+ u32 reg, ofs, bp, bm;
+ void __iomem *iomux_base = MXS_IO_ADDRESS(MXS_PINCTRL_BASE_ADDR);
+
+ /* muxsel */
+ ofs = 0x100;
+ ofs += PAD_BANK(pad) * 0x20 + PAD_PIN(pad) / 16 * 0x10;
+ bp = PAD_PIN(pad) % 16 * 2;
+ bm = 0x3 << bp;
+ reg = __raw_readl(iomux_base + ofs);
+ reg &= ~bm;
+ reg |= PAD_MUXSEL(pad) << bp;
+ __raw_writel(reg, iomux_base + ofs);
+
+ /* drive */
+ ofs = cpu_is_mx23() ? 0x200 : 0x300;
+ ofs += PAD_BANK(pad) * 0x40 + PAD_PIN(pad) / 8 * 0x10;
+ /* mA */
+ if (PAD_MA(pad) != PAD_MA_NONE) {
+ bp = PAD_PIN(pad) % 8 * 4;
+ bm = 0x3 << bp;
+ reg = __raw_readl(iomux_base + ofs);
+ reg &= ~bm;
+ reg |= PAD_MA(pad) << bp;
+ __raw_writel(reg, iomux_base + ofs);
+ }
+ /* vol */
+ if (PAD_VOL(pad) != PAD_VOL_NONE) {
+ bp = PAD_PIN(pad) % 8 * 4 + 2;
+ if (PAD_VOL(pad))
+ __mxs_setl(1 << bp, iomux_base + ofs);
+ else
+ __mxs_clrl(1 << bp, iomux_base + ofs);
+ }
+
+ /* pull */
+ ofs = cpu_is_mx23() ? 0x400 : 0x600;
+ ofs += PAD_BANK(pad) * 0x10;
+ bp = PAD_PIN(pad);
+ if (PAD_PULL(pad))
+ __mxs_setl(1 << bp, iomux_base + ofs);
+ else
+ __mxs_clrl(1 << bp, iomux_base + ofs);
+
+ return 0;
+}
+
+int mxs_iomux_setup_multiple_pads(const iomux_cfg_t *pad_list, unsigned count)
+{
+ const iomux_cfg_t *p = pad_list;
+ int i;
+ int ret;
+
+ for (i = 0; i < count; i++) {
+ ret = mxs_iomux_setup_pad(*p);
+ if (ret)
+ return ret;
+ p++;
+ }
+
+ return 0;
+}
--
1.7.1
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