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0adf882b68
Implement code for MX51 that allows the SoC to enter WFI when arch_idle is called. This patch is also necessary for correctly suspending the system. Signed-off-by: Dinh Nguyen <Dinh.Nguyen@freescale.com> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
85 lines
2.5 KiB
C
85 lines
2.5 KiB
C
/*
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* Copyright (C) 2011 Freescale Semiconductor, Inc. All Rights Reserved.
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*/
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/*
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* The code contained herein is licensed under the GNU General Public
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* License. You may obtain a copy of the GNU General Public License
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* Version 2 or later at the following locations:
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*
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* http://www.opensource.org/licenses/gpl-license.html
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* http://www.gnu.org/copyleft/gpl.html
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*/
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#include <linux/platform_device.h>
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#include <linux/io.h>
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#include <mach/hardware.h>
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#include "crm_regs.h"
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/* set cpu low power mode before WFI instruction. This function is called
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* mx5 because it can be used for mx50, mx51, and mx53.*/
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void mx5_cpu_lp_set(enum mxc_cpu_pwr_mode mode)
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{
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u32 plat_lpc, arm_srpgcr, ccm_clpcr;
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u32 empgc0, empgc1;
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int stop_mode = 0;
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/* always allow platform to issue a deep sleep mode request */
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plat_lpc = __raw_readl(MXC_CORTEXA8_PLAT_LPC) &
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~(MXC_CORTEXA8_PLAT_LPC_DSM);
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ccm_clpcr = __raw_readl(MXC_CCM_CLPCR) & ~(MXC_CCM_CLPCR_LPM_MASK);
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arm_srpgcr = __raw_readl(MXC_SRPG_ARM_SRPGCR) & ~(MXC_SRPGCR_PCR);
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empgc0 = __raw_readl(MXC_SRPG_EMPGC0_SRPGCR) & ~(MXC_SRPGCR_PCR);
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empgc1 = __raw_readl(MXC_SRPG_EMPGC1_SRPGCR) & ~(MXC_SRPGCR_PCR);
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switch (mode) {
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case WAIT_CLOCKED:
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break;
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case WAIT_UNCLOCKED:
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ccm_clpcr |= 0x1 << MXC_CCM_CLPCR_LPM_OFFSET;
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break;
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case WAIT_UNCLOCKED_POWER_OFF:
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case STOP_POWER_OFF:
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plat_lpc |= MXC_CORTEXA8_PLAT_LPC_DSM
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| MXC_CORTEXA8_PLAT_LPC_DBG_DSM;
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if (mode == WAIT_UNCLOCKED_POWER_OFF) {
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ccm_clpcr |= 0x1 << MXC_CCM_CLPCR_LPM_OFFSET;
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ccm_clpcr &= ~MXC_CCM_CLPCR_VSTBY;
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ccm_clpcr &= ~MXC_CCM_CLPCR_SBYOS;
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stop_mode = 0;
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} else {
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ccm_clpcr |= 0x2 << MXC_CCM_CLPCR_LPM_OFFSET;
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ccm_clpcr |= 0x3 << MXC_CCM_CLPCR_STBY_COUNT_OFFSET;
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ccm_clpcr |= MXC_CCM_CLPCR_VSTBY;
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ccm_clpcr |= MXC_CCM_CLPCR_SBYOS;
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stop_mode = 1;
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}
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arm_srpgcr |= MXC_SRPGCR_PCR;
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if (tzic_enable_wake(1) != 0)
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return;
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break;
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case STOP_POWER_ON:
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ccm_clpcr |= 0x2 << MXC_CCM_CLPCR_LPM_OFFSET;
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break;
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default:
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printk(KERN_WARNING "UNKNOWN cpu power mode: %d\n", mode);
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return;
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}
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__raw_writel(plat_lpc, MXC_CORTEXA8_PLAT_LPC);
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__raw_writel(ccm_clpcr, MXC_CCM_CLPCR);
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__raw_writel(arm_srpgcr, MXC_SRPG_ARM_SRPGCR);
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/* Enable NEON SRPG for all but MX50TO1.0. */
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if (mx50_revision() != IMX_CHIP_REVISION_1_0)
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__raw_writel(arm_srpgcr, MXC_SRPG_NEON_SRPGCR);
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if (stop_mode) {
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empgc0 |= MXC_SRPGCR_PCR;
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empgc1 |= MXC_SRPGCR_PCR;
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__raw_writel(empgc0, MXC_SRPG_EMPGC0_SRPGCR);
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__raw_writel(empgc1, MXC_SRPG_EMPGC1_SRPGCR);
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}
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}
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