arch/arm/mach-s3c64xx/include/mach/pm-core.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Copyright 2008 Openmoko, Inc.
   4  * Copyright 2008 Simtec Electronics
   5  *      Ben Dooks <ben@simtec.co.uk>
   6  *      http://armlinux.simtec.co.uk/
   7  *
   8  * S3C64XX - PM core support for arch/arm/plat-s3c/pm.c
   9  */
  10
  11 #ifndef __MACH_S3C64XX_PM_CORE_H
  12 #define __MACH_S3C64XX_PM_CORE_H __FILE__
  13
  14 #include <linux/serial_s3c.h>
  15 #include <linux/delay.h>
  16
  17 #include <mach/regs-gpio.h>
  18 #include <mach/regs-clock.h>
  19 #include <mach/map.h>
  20
  21 static inline void s3c_pm_debug_init_uart(void)
  22 {
  23         u32 tmp = __raw_readl(S3C_PCLK_GATE);
  24
  25         /* As a note, since the S3C64XX UARTs generally have multiple
  26          * clock sources, we simply enable PCLK at the moment and hope
  27          * that the resume settings for the UART are suitable for the
  28          * use with PCLK.
  29          */
  30
  31         tmp |= S3C_CLKCON_PCLK_UART0;
  32         tmp |= S3C_CLKCON_PCLK_UART1;
  33         tmp |= S3C_CLKCON_PCLK_UART2;
  34         tmp |= S3C_CLKCON_PCLK_UART3;
  35
  36         __raw_writel(tmp, S3C_PCLK_GATE);
  37         udelay(10);
  38 }
  39
  40 static inline void s3c_pm_arch_prepare_irqs(void)
  41 {
  42         /* VIC should have already been taken care of */
  43
  44         /* clear any pending EINT0 interrupts */
  45         __raw_writel(__raw_readl(S3C64XX_EINT0PEND), S3C64XX_EINT0PEND);
  46 }
  47
  48 static inline void s3c_pm_arch_stop_clocks(void)
  49 {
  50 }
  51
  52 static inline void s3c_pm_arch_show_resume_irqs(void)
  53 {
  54 }
  55
  56 /* make these defines, we currently do not have any need to change
  57  * the IRQ wake controls depending on the CPU we are running on */
  58 #ifdef CONFIG_PM_SLEEP
  59 #define s3c_irqwake_eintallow   ((1 << 28) - 1)
  60 #define s3c_irqwake_intallow    (~0)
  61 #else
  62 #define s3c_irqwake_eintallow 0
  63 #define s3c_irqwake_intallow  0
  64 #endif
  65
  66 static inline void s3c_pm_arch_update_uart(void __iomem *regs,
  67                                            struct pm_uart_save *save)
  68 {
  69         u32 ucon = __raw_readl(regs + S3C2410_UCON);
  70         u32 ucon_clk = ucon & S3C6400_UCON_CLKMASK;
  71         u32 save_clk = save->ucon & S3C6400_UCON_CLKMASK;
  72         u32 new_ucon;
  73         u32 delta;
  74
  75         /* S3C64XX UART blocks only support level interrupts, so ensure that
  76          * when we restore unused UART blocks we force the level interrupt
  77          * settigs. */
  78         save->ucon |= S3C2410_UCON_TXILEVEL | S3C2410_UCON_RXILEVEL;
  79
  80         /* We have a constraint on changing the clock type of the UART
  81          * between UCLKx and PCLK, so ensure that when we restore UCON
  82          * that the CLK field is correctly modified if the bootloader
  83          * has changed anything.
  84          */
  85         if (ucon_clk != save_clk) {
  86                 new_ucon = save->ucon;
  87                 delta = ucon_clk ^ save_clk;
  88
  89                 /* change from UCLKx => wrong PCLK,
  90                  * either UCLK can be tested for by a bit-test
  91                  * with UCLK0 */
  92                 if (ucon_clk & S3C6400_UCON_UCLK0 &&
  93                     !(save_clk & S3C6400_UCON_UCLK0) &&
  94                     delta & S3C6400_UCON_PCLK2) {
  95                         new_ucon &= ~S3C6400_UCON_UCLK0;
  96                 } else if (delta == S3C6400_UCON_PCLK2) {
  97                         /* as an precaution, don't change from
  98                          * PCLK2 => PCLK or vice-versa */
  99                         new_ucon ^= S3C6400_UCON_PCLK2;
 100                 }
 101
 102                 S3C_PMDBG("ucon change %04x => %04x (save=%04x)\n",
 103                           ucon, new_ucon, save->ucon);
 104                 save->ucon = new_ucon;
 105         }
 106 }
 107
 108 static inline void s3c_pm_restored_gpios(void)
 109 {
 110         /* ensure sleep mode has been cleared from the system */
 111
 112         __raw_writel(0, S3C64XX_SLPEN);
 113 }
 114
 115 static inline void samsung_pm_saved_gpios(void)
 116 {
 117         /* turn on the sleep mode and keep it there, as it seems that during
 118          * suspend the xCON registers get re-set and thus you can end up with
 119          * problems between going to sleep and resuming.
 120          */
 121
 122         __raw_writel(S3C64XX_SLPEN_USE_xSLP, S3C64XX_SLPEN);
 123 }
 124 #endif /* __MACH_S3C64XX_PM_CORE_H */