diff options
author | Sascha Hauer <s.hauer@pengutronix.de> | 2008-07-05 04:02:50 -0400 |
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committer | Robert Schwebel <r.schwebel@pengutronix.de> | 2008-07-05 04:02:50 -0400 |
commit | 90292ea60f1c730efb9fea02b2e12676da89ebef (patch) | |
tree | 514a820eca32b08b79864aeb5382d620d37b5d99 /arch/arm/mach-mx3/iomux.c | |
parent | 07bd1a6cc7cbb3f373fbe49b204c6cde5e9155fc (diff) |
MXC: add io multiplexing functions for mx3
This patch adds functions to use the io multiplexer on mx3 platforms.
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'arch/arm/mach-mx3/iomux.c')
-rw-r--r-- | arch/arm/mach-mx3/iomux.c | 111 |
1 files changed, 111 insertions, 0 deletions
diff --git a/arch/arm/mach-mx3/iomux.c b/arch/arm/mach-mx3/iomux.c new file mode 100644 index 000000000000..adc51feefc1d --- /dev/null +++ b/arch/arm/mach-mx3/iomux.c | |||
@@ -0,0 +1,111 @@ | |||
1 | /* | ||
2 | * Copyright 2004-2006 Freescale Semiconductor, Inc. All Rights Reserved. | ||
3 | * Copyright (C) 2008 by Sascha Hauer <kernel@pengutronix.de> | ||
4 | * | ||
5 | * This program is free software; you can redistribute it and/or | ||
6 | * modify it under the terms of the GNU General Public License | ||
7 | * as published by the Free Software Foundation; either version 2 | ||
8 | * of the License, or (at your option) any later version. | ||
9 | * This program is distributed in the hope that it will be useful, | ||
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
12 | * GNU General Public License for more details. | ||
13 | * | ||
14 | * You should have received a copy of the GNU General Public License | ||
15 | * along with this program; if not, write to the Free Software | ||
16 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, | ||
17 | * MA 02110-1301, USA. | ||
18 | */ | ||
19 | |||
20 | #include <linux/module.h> | ||
21 | #include <linux/spinlock.h> | ||
22 | #include <linux/io.h> | ||
23 | #include <linux/gpio.h> | ||
24 | #include <asm/hardware.h> | ||
25 | #include <asm/arch/gpio.h> | ||
26 | #include <asm/arch/iomux-mx3.h> | ||
27 | |||
28 | /* | ||
29 | * IOMUX register (base) addresses | ||
30 | */ | ||
31 | #define IOMUX_BASE IO_ADDRESS(IOMUXC_BASE_ADDR) | ||
32 | #define IOMUXINT_OBS1 (IOMUX_BASE + 0x000) | ||
33 | #define IOMUXINT_OBS2 (IOMUX_BASE + 0x004) | ||
34 | #define IOMUXGPR (IOMUX_BASE + 0x008) | ||
35 | #define IOMUXSW_MUX_CTL (IOMUX_BASE + 0x00C) | ||
36 | #define IOMUXSW_PAD_CTL (IOMUX_BASE + 0x154) | ||
37 | |||
38 | static DEFINE_SPINLOCK(gpio_mux_lock); | ||
39 | |||
40 | #define IOMUX_REG_MASK (IOMUX_PADNUM_MASK & ~0x3) | ||
41 | /* | ||
42 | * set the mode for a IOMUX pin. | ||
43 | */ | ||
44 | int mxc_iomux_mode(unsigned int pin_mode) | ||
45 | { | ||
46 | u32 reg, field, l, mode, ret = 0; | ||
47 | |||
48 | reg = IOMUXSW_MUX_CTL + (pin_mode & IOMUX_REG_MASK); | ||
49 | field = pin_mode & 0x3; | ||
50 | mode = (pin_mode & IOMUX_MODE_MASK) >> IOMUX_MODE_SHIFT; | ||
51 | |||
52 | pr_debug("%s: reg offset = 0x%x field = %d mode = 0x%02x\n", | ||
53 | __func__, (pin_mode & IOMUX_REG_MASK), field, mode); | ||
54 | |||
55 | spin_lock(&gpio_mux_lock); | ||
56 | |||
57 | l = __raw_readl(reg); | ||
58 | l &= ~(0xff << (field * 8)); | ||
59 | l |= mode << (field * 8); | ||
60 | __raw_writel(l, reg); | ||
61 | |||
62 | spin_unlock(&gpio_mux_lock); | ||
63 | |||
64 | return ret; | ||
65 | } | ||
66 | EXPORT_SYMBOL(mxc_iomux_mode); | ||
67 | |||
68 | /* | ||
69 | * This function configures the pad value for a IOMUX pin. | ||
70 | */ | ||
71 | void mxc_iomux_set_pad(enum iomux_pins pin, u32 config) | ||
72 | { | ||
73 | u32 reg, field, l; | ||
74 | |||
75 | reg = IOMUXSW_PAD_CTL + (pin + 2) / 3; | ||
76 | field = (pin + 2) % 3; | ||
77 | |||
78 | pr_debug("%s: reg offset = 0x%x field = %d\n", | ||
79 | __func__, (pin + 2) / 3, field); | ||
80 | |||
81 | spin_lock(&gpio_mux_lock); | ||
82 | |||
83 | l = __raw_readl(reg); | ||
84 | l &= ~(0x1ff << (field * 9)); | ||
85 | l |= config << (field * 9); | ||
86 | __raw_writel(l, reg); | ||
87 | |||
88 | spin_unlock(&gpio_mux_lock); | ||
89 | } | ||
90 | EXPORT_SYMBOL(mxc_iomux_set_pad); | ||
91 | |||
92 | /* | ||
93 | * This function enables/disables the general purpose function for a particular | ||
94 | * signal. | ||
95 | */ | ||
96 | void mxc_iomux_set_gpr(enum iomux_gp_func gp, bool en) | ||
97 | { | ||
98 | u32 l; | ||
99 | |||
100 | spin_lock(&gpio_mux_lock); | ||
101 | l = __raw_readl(IOMUXGPR); | ||
102 | if (en) | ||
103 | l |= gp; | ||
104 | else | ||
105 | l &= ~gp; | ||
106 | |||
107 | __raw_writel(l, IOMUXGPR); | ||
108 | spin_unlock(&gpio_mux_lock); | ||
109 | } | ||
110 | EXPORT_SYMBOL(mxc_iomux_set_gpr); | ||
111 | |||