1 /* Copyright (c) 2010, Code Aurora Forum. All rights reserved.
2 *
3 * This program is free software; you can redistribute it and/or modify
4 * it under the terms of the GNU General Public License version 2 and
5 * only version 2 as published by the Free Software Foundation.
6 *
7 * This program is distributed in the hope that it will be useful,
8 * but WITHOUT ANY WARRANTY; without even the implied warranty of
9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
10 * GNU General Public License for more details.
11 *
12 * You should have received a copy of the GNU General Public License
13 * along with this program; if not, write to the Free Software
14 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
15 * 02110-1301, USA.
16 */
17 #include <linux/module.h>
18 #include <linux/spinlock.h>
19 #include "gpiomux.h"
20 #include "proc_comm.h"
21
22 static DEFINE_SPINLOCK(gpiomux_lock);
23
__msm_gpiomux_write(unsigned gpio,gpiomux_config_t val)24 static void __msm_gpiomux_write(unsigned gpio, gpiomux_config_t val)
25 {
26 unsigned tlmm_config = (val & ~GPIOMUX_CTL_MASK) |
27 ((gpio & 0x3ff) << 4);
28 unsigned tlmm_disable = 0;
29 int rc;
30
31 rc = msm_proc_comm(PCOM_RPC_GPIO_TLMM_CONFIG_EX,
32 &tlmm_config, &tlmm_disable);
33 if (rc)
34 pr_err("%s: unexpected proc_comm failure %d: %08x %08x\n",
35 __func__, rc, tlmm_config, tlmm_disable);
36 }
37
msm_gpiomux_write(unsigned gpio,gpiomux_config_t active,gpiomux_config_t suspended)38 int msm_gpiomux_write(unsigned gpio,
39 gpiomux_config_t active,
40 gpiomux_config_t suspended)
41 {
42 struct msm_gpiomux_config *cfg = msm_gpiomux_configs + gpio;
43 unsigned long irq_flags;
44 gpiomux_config_t setting;
45
46 if (gpio >= GPIOMUX_NGPIOS)
47 return -EINVAL;
48
49 spin_lock_irqsave(&gpiomux_lock, irq_flags);
50
51 if (active & GPIOMUX_VALID)
52 cfg->active = active;
53
54 if (suspended & GPIOMUX_VALID)
55 cfg->suspended = suspended;
56
57 setting = cfg->ref ? active : suspended;
58 if (setting & GPIOMUX_VALID)
59 __msm_gpiomux_write(gpio, setting);
60
61 spin_unlock_irqrestore(&gpiomux_lock, irq_flags);
62 return 0;
63 }
64 EXPORT_SYMBOL(msm_gpiomux_write);
65
msm_gpiomux_get(unsigned gpio)66 int msm_gpiomux_get(unsigned gpio)
67 {
68 struct msm_gpiomux_config *cfg = msm_gpiomux_configs + gpio;
69 unsigned long irq_flags;
70
71 if (gpio >= GPIOMUX_NGPIOS)
72 return -EINVAL;
73
74 spin_lock_irqsave(&gpiomux_lock, irq_flags);
75 if (cfg->ref++ == 0 && cfg->active & GPIOMUX_VALID)
76 __msm_gpiomux_write(gpio, cfg->active);
77 spin_unlock_irqrestore(&gpiomux_lock, irq_flags);
78 return 0;
79 }
80 EXPORT_SYMBOL(msm_gpiomux_get);
81
msm_gpiomux_put(unsigned gpio)82 int msm_gpiomux_put(unsigned gpio)
83 {
84 struct msm_gpiomux_config *cfg = msm_gpiomux_configs + gpio;
85 unsigned long irq_flags;
86
87 if (gpio >= GPIOMUX_NGPIOS)
88 return -EINVAL;
89
90 spin_lock_irqsave(&gpiomux_lock, irq_flags);
91 BUG_ON(cfg->ref == 0);
92 if (--cfg->ref == 0 && cfg->suspended & GPIOMUX_VALID)
93 __msm_gpiomux_write(gpio, cfg->suspended);
94 spin_unlock_irqrestore(&gpiomux_lock, irq_flags);
95 return 0;
96 }
97 EXPORT_SYMBOL(msm_gpiomux_put);
98
gpiomux_init(void)99 static int __init gpiomux_init(void)
100 {
101 unsigned n;
102
103 for (n = 0; n < GPIOMUX_NGPIOS; ++n) {
104 msm_gpiomux_configs[n].ref = 0;
105 if (!(msm_gpiomux_configs[n].suspended & GPIOMUX_VALID))
106 continue;
107 __msm_gpiomux_write(n, msm_gpiomux_configs[n].suspended);
108 }
109 return 0;
110 }
111 postcore_initcall(gpiomux_init);
112