bd117bd161
Add the initial support for the S3C64XX based systems to use suspend-to-RAM to sleep. Includes basic debugging for use with the SMDK6410 usign the LEDs on the baseboard. Signed-off-by: Ben Dooks <ben-linux@fluff.org>
98 lines
2.8 KiB
C
98 lines
2.8 KiB
C
/* linux/arch/arm/plat-s3c64xx/include/plat/pm-core.h
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*
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* Copyright 2008 Openmoko, Inc.
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* Copyright 2008 Simtec Electronics
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* Ben Dooks <ben@simtec.co.uk>
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* http://armlinux.simtec.co.uk/
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*
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* S3C64XX - PM core support for arch/arm/plat-s3c/pm.c
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <plat/regs-gpio.h>
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static inline void s3c_pm_debug_init_uart(void)
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{
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u32 tmp = __raw_readl(S3C_PCLK_GATE);
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/* As a note, since the S3C64XX UARTs generally have multiple
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* clock sources, we simply enable PCLK at the moment and hope
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* that the resume settings for the UART are suitable for the
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* use with PCLK.
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*/
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tmp |= S3C_CLKCON_PCLK_UART0;
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tmp |= S3C_CLKCON_PCLK_UART1;
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tmp |= S3C_CLKCON_PCLK_UART2;
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tmp |= S3C_CLKCON_PCLK_UART3;
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__raw_writel(tmp, S3C_PCLK_GATE);
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udelay(10);
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}
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static inline void s3c_pm_arch_prepare_irqs(void)
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{
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/* VIC should have already been taken care of */
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/* clear any pending EINT0 interrupts */
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__raw_writel(__raw_readl(S3C64XX_EINT0PEND), S3C64XX_EINT0PEND);
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}
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static inline void s3c_pm_arch_stop_clocks(void)
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{
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}
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static inline void s3c_pm_arch_show_resume_irqs(void)
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{
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}
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/* make these defines, we currently do not have any need to change
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* the IRQ wake controls depending on the CPU we are running on */
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#define s3c_irqwake_eintallow ((1 << 28) - 1)
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#define s3c_irqwake_intallow (0)
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static inline void s3c_pm_arch_update_uart(void __iomem *regs,
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struct pm_uart_save *save)
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{
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u32 ucon = __raw_readl(regs + S3C2410_UCON);
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u32 ucon_clk = ucon & S3C6400_UCON_CLKMASK;
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u32 save_clk = save->ucon & S3C6400_UCON_CLKMASK;
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u32 new_ucon;
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u32 delta;
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/* S3C64XX UART blocks only support level interrupts, so ensure that
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* when we restore unused UART blocks we force the level interrupt
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* settigs. */
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save->ucon |= S3C2410_UCON_TXILEVEL | S3C2410_UCON_RXILEVEL;
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/* We have a constraint on changing the clock type of the UART
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* between UCLKx and PCLK, so ensure that when we restore UCON
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* that the CLK field is correctly modified if the bootloader
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* has changed anything.
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*/
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if (ucon_clk != save_clk) {
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new_ucon = save->ucon;
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delta = ucon_clk ^ save_clk;
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/* change from UCLKx => wrong PCLK,
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* either UCLK can be tested for by a bit-test
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* with UCLK0 */
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if (ucon_clk & S3C6400_UCON_UCLK0 &&
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!(save_clk & S3C6400_UCON_UCLK0) &&
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delta & S3C6400_UCON_PCLK2) {
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new_ucon &= ~S3C6400_UCON_UCLK0;
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} else if (delta == S3C6400_UCON_PCLK2) {
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/* as an precaution, don't change from
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* PCLK2 => PCLK or vice-versa */
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new_ucon ^= S3C6400_UCON_PCLK2;
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}
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S3C_PMDBG("ucon change %04x => %04x (save=%04x)\n",
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ucon, new_ucon, save->ucon);
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save->ucon = new_ucon;
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}
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}
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