1 /***************************************************************************
3 * Open \______ \ ____ ____ | | _\_ |__ _______ ___
4 * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
5 * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
6 * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
10 * Copyright (C) 2007 by Michael Sevakis
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation; either version 2
15 * of the License, or (at your option) any later version.
17 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
18 * KIND, either express or implied.
20 ****************************************************************************/
23 #include "avic-imx31.h"
24 #include "spi-imx31.h"
26 #include "ccm-imx31.h"
27 #include "sdma-imx31.h"
28 #include "dvfs_dptc-imx31.h"
32 static __attribute__((interrupt("IRQ"))) void EPIT1_HANDLER(void)
34 EPITSR1
= EPITSR_OCIF
; /* Clear the pending status */
36 /* Run through the list of tick tasks */
40 void INIT_ATTR
tick_start(unsigned int interval_in_ms
)
42 ccm_module_clock_gating(CG_EPIT1
, CGM_ON_RUN_WAIT
); /* EPIT1 module
43 clock ON - before writing
45 EPITCR1
&= ~(EPITCR_OCIEN
| EPITCR_EN
); /* Disable the counter */
46 CCM_WIMR0
&= ~CCM_WIMR0_IPI_INT_EPIT1
; /* Clear wakeup mask */
48 /* mcu_main_clk = 528MHz = 27MHz * 2 * ((9 + 7/9) / 1)
49 * CLKSRC = ipg_clk = 528MHz / 4 / 2 = 66MHz,
50 * EPIT Output Disconnected,
51 * Enabled in wait mode
52 * Prescale 1/2640 for 25KHz
53 * Reload from modulus register,
54 * Compare interrupt enabled,
55 * Count from load value */
56 EPITCR1
= EPITCR_CLKSRC_IPG_CLK
| EPITCR_WAITEN
| EPITCR_IOVW
|
57 ((2640-1) << EPITCR_PRESCALER_POS
) | EPITCR_RLD
|
58 EPITCR_OCIEN
| EPITCR_ENMOD
;
60 EPITLR1
= interval_in_ms
*25; /* Count down from interval */
61 EPITCMPR1
= 0; /* Event when counter reaches 0 */
62 EPITSR1
= EPITSR_OCIF
; /* Clear any pending interrupt */
63 avic_enable_int(INT_EPIT1
, INT_TYPE_IRQ
, INT_PRIO_DEFAULT
,
65 EPITCR1
|= EPITCR_EN
; /* Enable the counter */
68 void INIT_ATTR
kernel_device_init(void)
74 dvfs_wfi_monitor(true); /* Monitor the WFI signal */
76 dvfs_dptc_start(); /* Should be ok to start even so early */
82 avic_disable_int(INT_EPIT1
); /* Disable insterrupt */
83 EPITCR1
&= ~(EPITCR_OCIEN
| EPITCR_EN
); /* Disable counter */
84 EPITSR1
= EPITSR_OCIF
; /* Clear pending */
85 ccm_module_clock_gating(CG_EPIT1
, CGM_OFF
); /* Turn off module clock */