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c02060d8 PW |
1 | /* |
2 | * OMAP IP block custom reset and preprogramming stubs | |
3 | * | |
4 | * Copyright (C) 2012 Texas Instruments, Inc. | |
5 | * Paul Walmsley | |
6 | * | |
7 | * A small number of IP blocks need custom reset and preprogramming | |
8 | * functions. The stubs in this file provide a standard way for the | |
9 | * hwmod code to call these functions, which are to be located under | |
10 | * drivers/. | |
11 | * | |
12 | * This program is free software; you can redistribute it and/or | |
13 | * modify it under the terms of the GNU General Public License as | |
14 | * published by the Free Software Foundation version 2. | |
15 | * | |
16 | * This program is distributed "as is" WITHOUT ANY WARRANTY of any | |
17 | * kind, whether express or implied; without even the implied warranty | |
18 | * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 | * GNU General Public License for more details. | |
20 | * | |
21 | * You should have received a copy of the GNU General Public License | |
22 | * along with this program; if not, write to the Free Software | |
23 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA | |
24 | * 02110-1301 USA | |
25 | */ | |
26 | #include <linux/kernel.h> | |
55ccb1a8 | 27 | #include <linux/errno.h> |
c02060d8 PW |
28 | |
29 | #include <sound/aess.h> | |
30 | ||
31 | #include "omap_hwmod.h" | |
461932df LV |
32 | #include "common.h" |
33 | ||
34 | #define OMAP_RTC_STATUS_REG 0x44 | |
35 | #define OMAP_RTC_KICK0_REG 0x6c | |
36 | #define OMAP_RTC_KICK1_REG 0x70 | |
37 | ||
38 | #define OMAP_RTC_KICK0_VALUE 0x83E70B13 | |
39 | #define OMAP_RTC_KICK1_VALUE 0x95A4F1E0 | |
40 | #define OMAP_RTC_STATUS_BUSY BIT(0) | |
41 | #define OMAP_RTC_MAX_READY_TIME 50 | |
c02060d8 PW |
42 | |
43 | /** | |
44 | * omap_hwmod_aess_preprogram - enable AESS internal autogating | |
45 | * @oh: struct omap_hwmod * | |
46 | * | |
47 | * The AESS will not IdleAck to the PRCM until its internal autogating | |
48 | * is enabled. Since internal autogating is disabled by default after | |
49 | * AESS reset, we must enable autogating after the hwmod code resets | |
50 | * the AESS. Returns 0. | |
51 | */ | |
52 | int omap_hwmod_aess_preprogram(struct omap_hwmod *oh) | |
53 | { | |
54 | void __iomem *va; | |
55 | ||
56 | va = omap_hwmod_get_mpu_rt_va(oh); | |
57 | if (!va) | |
58 | return -EINVAL; | |
59 | ||
60 | aess_enable_autogating(va); | |
61 | ||
62 | return 0; | |
63 | } | |
461932df LV |
64 | |
65 | /** | |
66 | * omap_rtc_wait_not_busy - Wait for the RTC BUSY flag | |
67 | * @oh: struct omap_hwmod * | |
68 | * | |
69 | * For updating certain RTC registers, the MPU must wait | |
70 | * for the BUSY status in OMAP_RTC_STATUS_REG to become zero. | |
71 | * Once the BUSY status is zero, there is a 15 microseconds access | |
72 | * period in which the MPU can program. | |
73 | */ | |
74 | static void omap_rtc_wait_not_busy(struct omap_hwmod *oh) | |
75 | { | |
76 | int i; | |
77 | ||
78 | /* BUSY may stay active for 1/32768 second (~30 usec) */ | |
79 | omap_test_timeout(omap_hwmod_read(oh, OMAP_RTC_STATUS_REG) | |
80 | & OMAP_RTC_STATUS_BUSY, OMAP_RTC_MAX_READY_TIME, i); | |
81 | /* now we have ~15 microseconds to read/write various registers */ | |
82 | } | |
83 | ||
84 | /** | |
85 | * omap_hwmod_rtc_unlock - Unlock the Kicker mechanism. | |
86 | * @oh: struct omap_hwmod * | |
87 | * | |
88 | * RTC IP have kicker feature. This prevents spurious writes to its registers. | |
89 | * In order to write into any of the RTC registers, KICK values has te be | |
90 | * written in respective KICK registers. This is needed for hwmod to write into | |
91 | * sysconfig register. | |
92 | */ | |
93 | void omap_hwmod_rtc_unlock(struct omap_hwmod *oh) | |
94 | { | |
95 | local_irq_disable(); | |
96 | omap_rtc_wait_not_busy(oh); | |
97 | omap_hwmod_write(OMAP_RTC_KICK0_VALUE, oh, OMAP_RTC_KICK0_REG); | |
98 | omap_hwmod_write(OMAP_RTC_KICK1_VALUE, oh, OMAP_RTC_KICK1_REG); | |
99 | local_irq_enable(); | |
100 | } | |
101 | ||
102 | /** | |
103 | * omap_hwmod_rtc_lock - Lock the Kicker mechanism. | |
104 | * @oh: struct omap_hwmod * | |
105 | * | |
106 | * RTC IP have kicker feature. This prevents spurious writes to its registers. | |
107 | * Once the RTC registers are written, KICK mechanism needs to be locked, | |
108 | * in order to prevent any spurious writes. This function locks back the RTC | |
109 | * registers once hwmod completes its write into sysconfig register. | |
110 | */ | |
111 | void omap_hwmod_rtc_lock(struct omap_hwmod *oh) | |
112 | { | |
113 | local_irq_disable(); | |
114 | omap_rtc_wait_not_busy(oh); | |
115 | omap_hwmod_write(0x0, oh, OMAP_RTC_KICK0_REG); | |
116 | omap_hwmod_write(0x0, oh, OMAP_RTC_KICK1_REG); | |
117 | local_irq_enable(); | |
118 | } |