Ben Dooks | a21765a | 2007-02-11 18:31:01 +0100 | [diff] [blame] | 1 | /* linux/arch/arm/plat-s3c24xx/pm.c |
| 2 | * |
Ben Dooks | ccae941 | 2009-11-13 22:54:14 +0000 | [diff] [blame] | 3 | * Copyright (c) 2004-2006 Simtec Electronics |
Ben Dooks | a21765a | 2007-02-11 18:31:01 +0100 | [diff] [blame] | 4 | * Ben Dooks <ben@simtec.co.uk> |
| 5 | * |
| 6 | * S3C24XX Power Manager (Suspend-To-RAM) support |
| 7 | * |
| 8 | * See Documentation/arm/Samsung-S3C24XX/Suspend.txt for more information |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or modify |
| 11 | * it under the terms of the GNU General Public License as published by |
| 12 | * the Free Software Foundation; either version 2 of the License, or |
| 13 | * (at your option) any later version. |
| 14 | * |
| 15 | * This program is distributed in the hope that it will be useful, |
| 16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 18 | * GNU General Public License for more details. |
| 19 | * |
| 20 | * You should have received a copy of the GNU General Public License |
| 21 | * along with this program; if not, write to the Free Software |
| 22 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 23 | * |
| 24 | * Parts based on arch/arm/mach-pxa/pm.c |
| 25 | * |
| 26 | * Thanks to Dimitry Andric for debugging |
| 27 | */ |
| 28 | |
| 29 | #include <linux/init.h> |
| 30 | #include <linux/suspend.h> |
| 31 | #include <linux/errno.h> |
| 32 | #include <linux/time.h> |
Ben Dooks | ec976d6 | 2009-05-13 22:52:24 +0100 | [diff] [blame] | 33 | #include <linux/gpio.h> |
Ben Dooks | a21765a | 2007-02-11 18:31:01 +0100 | [diff] [blame] | 34 | #include <linux/interrupt.h> |
Ben Dooks | a21765a | 2007-02-11 18:31:01 +0100 | [diff] [blame] | 35 | #include <linux/serial_core.h> |
Tushar Behera | 334a1c7 | 2014-02-14 10:32:45 +0900 | [diff] [blame] | 36 | #include <linux/serial_s3c.h> |
Russell King | fced80c | 2008-09-06 12:10:45 +0100 | [diff] [blame] | 37 | #include <linux/io.h> |
Ben Dooks | a21765a | 2007-02-11 18:31:01 +0100 | [diff] [blame] | 38 | |
Russell King | a09e64f | 2008-08-05 16:14:15 +0100 | [diff] [blame] | 39 | #include <mach/regs-clock.h> |
| 40 | #include <mach/regs-gpio.h> |
Russell King | a09e64f | 2008-08-05 16:14:15 +0100 | [diff] [blame] | 41 | #include <mach/regs-irq.h> |
Linus Walleij | b0161ca | 2014-01-14 14:24:24 +0100 | [diff] [blame] | 42 | #include <mach/gpio-samsung.h> |
Ben Dooks | a21765a | 2007-02-11 18:31:01 +0100 | [diff] [blame] | 43 | |
| 44 | #include <asm/mach/time.h> |
| 45 | |
Ben Dooks | 40b956f | 2010-05-04 14:38:49 +0900 | [diff] [blame] | 46 | #include <plat/gpio-cfg.h> |
Ben Dooks | a2b7ba9 | 2008-10-07 22:26:09 +0100 | [diff] [blame] | 47 | #include <plat/pm.h> |
Ben Dooks | a21765a | 2007-02-11 18:31:01 +0100 | [diff] [blame] | 48 | |
Kukjin Kim | 37c3adc | 2013-02-03 17:00:11 -0800 | [diff] [blame] | 49 | #include "regs-mem.h" |
| 50 | |
Ben Dooks | a21765a | 2007-02-11 18:31:01 +0100 | [diff] [blame] | 51 | #define PFX "s3c24xx-pm: " |
| 52 | |
| 53 | static struct sleep_save core_save[] = { |
Ben Dooks | a21765a | 2007-02-11 18:31:01 +0100 | [diff] [blame] | 54 | /* we restore the timings here, with the proviso that the board |
| 55 | * brings the system up in an slower, or equal frequency setting |
| 56 | * to the original system. |
| 57 | * |
| 58 | * if we cannot guarantee this, then things are going to go very |
| 59 | * wrong here, as we modify the refresh and both pll settings. |
| 60 | */ |
| 61 | |
| 62 | SAVE_ITEM(S3C2410_BWSCON), |
| 63 | SAVE_ITEM(S3C2410_BANKCON0), |
| 64 | SAVE_ITEM(S3C2410_BANKCON1), |
| 65 | SAVE_ITEM(S3C2410_BANKCON2), |
| 66 | SAVE_ITEM(S3C2410_BANKCON3), |
| 67 | SAVE_ITEM(S3C2410_BANKCON4), |
| 68 | SAVE_ITEM(S3C2410_BANKCON5), |
Ben Dooks | a21765a | 2007-02-11 18:31:01 +0100 | [diff] [blame] | 69 | }; |
| 70 | |
Ben Dooks | 549c7e3 | 2008-12-12 00:24:07 +0000 | [diff] [blame] | 71 | /* s3c_pm_check_resume_pin |
Ben Dooks | a21765a | 2007-02-11 18:31:01 +0100 | [diff] [blame] | 72 | * |
| 73 | * check to see if the pin is configured correctly for sleep mode, and |
| 74 | * make any necessary adjustments if it is not |
| 75 | */ |
| 76 | |
Ben Dooks | 549c7e3 | 2008-12-12 00:24:07 +0000 | [diff] [blame] | 77 | static void s3c_pm_check_resume_pin(unsigned int pin, unsigned int irqoffs) |
Ben Dooks | a21765a | 2007-02-11 18:31:01 +0100 | [diff] [blame] | 78 | { |
| 79 | unsigned long irqstate; |
| 80 | unsigned long pinstate; |
Ben Dooks | 5690a62 | 2010-05-04 17:14:10 +0900 | [diff] [blame] | 81 | int irq = gpio_to_irq(pin); |
Ben Dooks | a21765a | 2007-02-11 18:31:01 +0100 | [diff] [blame] | 82 | |
| 83 | if (irqoffs < 4) |
| 84 | irqstate = s3c_irqwake_intmask & (1L<<irqoffs); |
| 85 | else |
| 86 | irqstate = s3c_irqwake_eintmask & (1L<<irqoffs); |
| 87 | |
Ben Dooks | 9933847 | 2010-05-06 10:50:42 +0900 | [diff] [blame] | 88 | pinstate = s3c_gpio_getcfg(pin); |
Ben Dooks | a21765a | 2007-02-11 18:31:01 +0100 | [diff] [blame] | 89 | |
| 90 | if (!irqstate) { |
| 91 | if (pinstate == S3C2410_GPIO_IRQ) |
Ben Dooks | 9933847 | 2010-05-06 10:50:42 +0900 | [diff] [blame] | 92 | S3C_PMDBG("Leaving IRQ %d (pin %d) as is\n", irq, pin); |
Ben Dooks | a21765a | 2007-02-11 18:31:01 +0100 | [diff] [blame] | 93 | } else { |
| 94 | if (pinstate == S3C2410_GPIO_IRQ) { |
Ben Dooks | 6419711 | 2008-12-12 00:24:06 +0000 | [diff] [blame] | 95 | S3C_PMDBG("Disabling IRQ %d (pin %d)\n", irq, pin); |
Ben Dooks | 40b956f | 2010-05-04 14:38:49 +0900 | [diff] [blame] | 96 | s3c_gpio_cfgpin(pin, S3C2410_GPIO_INPUT); |
Ben Dooks | a21765a | 2007-02-11 18:31:01 +0100 | [diff] [blame] | 97 | } |
| 98 | } |
| 99 | } |
| 100 | |
Ben Dooks | 2261e0e | 2008-12-12 00:24:08 +0000 | [diff] [blame] | 101 | /* s3c_pm_configure_extint |
Ben Dooks | a21765a | 2007-02-11 18:31:01 +0100 | [diff] [blame] | 102 | * |
| 103 | * configure all external interrupt pins |
| 104 | */ |
| 105 | |
Ben Dooks | 2261e0e | 2008-12-12 00:24:08 +0000 | [diff] [blame] | 106 | void s3c_pm_configure_extint(void) |
Ben Dooks | a21765a | 2007-02-11 18:31:01 +0100 | [diff] [blame] | 107 | { |
| 108 | int pin; |
| 109 | |
| 110 | /* for each of the external interrupts (EINT0..EINT15) we |
Adam Buchbinder | 48fc7f7 | 2012-09-19 21:48:00 -0400 | [diff] [blame] | 111 | * need to check whether it is an external interrupt source, |
Ben Dooks | a21765a | 2007-02-11 18:31:01 +0100 | [diff] [blame] | 112 | * and then configure it as an input if it is not |
| 113 | */ |
| 114 | |
Ben Dooks | 070276d | 2009-05-17 22:32:23 +0100 | [diff] [blame] | 115 | for (pin = S3C2410_GPF(0); pin <= S3C2410_GPF(7); pin++) { |
| 116 | s3c_pm_check_resume_pin(pin, pin - S3C2410_GPF(0)); |
Ben Dooks | a21765a | 2007-02-11 18:31:01 +0100 | [diff] [blame] | 117 | } |
| 118 | |
Ben Dooks | 070276d | 2009-05-17 22:32:23 +0100 | [diff] [blame] | 119 | for (pin = S3C2410_GPG(0); pin <= S3C2410_GPG(7); pin++) { |
| 120 | s3c_pm_check_resume_pin(pin, (pin - S3C2410_GPG(0))+8); |
Ben Dooks | a21765a | 2007-02-11 18:31:01 +0100 | [diff] [blame] | 121 | } |
| 122 | } |
| 123 | |
Ben Dooks | 62feee6 | 2008-01-28 13:01:24 +0100 | [diff] [blame] | 124 | |
Ben Dooks | 2261e0e | 2008-12-12 00:24:08 +0000 | [diff] [blame] | 125 | void s3c_pm_restore_core(void) |
Ben Dooks | a21765a | 2007-02-11 18:31:01 +0100 | [diff] [blame] | 126 | { |
Ben Dooks | 6419711 | 2008-12-12 00:24:06 +0000 | [diff] [blame] | 127 | s3c_pm_do_restore_core(core_save, ARRAY_SIZE(core_save)); |
Ben Dooks | a21765a | 2007-02-11 18:31:01 +0100 | [diff] [blame] | 128 | } |
| 129 | |
Ben Dooks | 2261e0e | 2008-12-12 00:24:08 +0000 | [diff] [blame] | 130 | void s3c_pm_save_core(void) |
Ben Dooks | a21765a | 2007-02-11 18:31:01 +0100 | [diff] [blame] | 131 | { |
Ben Dooks | 2261e0e | 2008-12-12 00:24:08 +0000 | [diff] [blame] | 132 | s3c_pm_do_save(core_save, ARRAY_SIZE(core_save)); |
Ben Dooks | a21765a | 2007-02-11 18:31:01 +0100 | [diff] [blame] | 133 | } |
Ben Dooks | 2261e0e | 2008-12-12 00:24:08 +0000 | [diff] [blame] | 134 | |