USB: serial: option: reimplement interface masking
[linux/fpc-iii.git] / arch / arm / mach-omap2 / omap_hwmod_reset.c
blobb68f9c0aff0b594d97af0c004c2525a7072197f0
1 /*
2 * OMAP IP block custom reset and preprogramming stubs
4 * Copyright (C) 2012 Texas Instruments, Inc.
5 * Paul Walmsley
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/.
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.
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.
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
26 #include <linux/kernel.h>
27 #include <linux/errno.h>
29 #include <sound/aess.h>
31 #include "omap_hwmod.h"
32 #include "common.h"
34 #define OMAP_RTC_STATUS_REG 0x44
35 #define OMAP_RTC_KICK0_REG 0x6c
36 #define OMAP_RTC_KICK1_REG 0x70
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
43 /**
44 * omap_hwmod_aess_preprogram - enable AESS internal autogating
45 * @oh: struct omap_hwmod *
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.
52 int omap_hwmod_aess_preprogram(struct omap_hwmod *oh)
54 void __iomem *va;
56 va = omap_hwmod_get_mpu_rt_va(oh);
57 if (!va)
58 return -EINVAL;
60 aess_enable_autogating(va);
62 return 0;
65 /**
66 * omap_rtc_wait_not_busy - Wait for the RTC BUSY flag
67 * @oh: struct omap_hwmod *
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.
74 static void omap_rtc_wait_not_busy(struct omap_hwmod *oh)
76 int i;
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 */
84 /**
85 * omap_hwmod_rtc_unlock - Unlock the Kicker mechanism.
86 * @oh: struct omap_hwmod *
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.
93 void omap_hwmod_rtc_unlock(struct omap_hwmod *oh)
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();
103 * omap_hwmod_rtc_lock - Lock the Kicker mechanism.
104 * @oh: struct omap_hwmod *
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.
111 void omap_hwmod_rtc_lock(struct omap_hwmod *oh)
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();