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/*
* Copyright 2011-2013 Freescale Semiconductor, Inc.
* Copyright 2011 Linaro Ltd.
*
* The code contained herein is licensed under the GNU General Public
* License. You may obtain a copy of the GNU General Public License
* Version 2 or later at the following locations:
*
* http://www.opensource.org/licenses/gpl-license.html
* http://www.gnu.org/copyleft/gpl.html
*/
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/mfd/syscon.h>
#include <linux/mfd/syscon/imx6q-iomuxc-gpr.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/regmap.h>
#include <linux/suspend.h>
#include <asm/cacheflush.h>
#include <asm/proc-fns.h>
#include <asm/suspend.h>
#include <asm/hardware/cache-l2x0.h>
#include "common.h"
#include "hardware.h"
#define CCR 0x0
#define BM_CCR_WB_COUNT (0x7 << 16)
#define BM_CCR_RBC_BYPASS_COUNT (0x3f << 21)
#define BM_CCR_RBC_EN (0x1 << 27)
#define CLPCR 0x54
#define BP_CLPCR_LPM 0
#define BM_CLPCR_LPM (0x3 << 0)
#define BM_CLPCR_BYPASS_PMIC_READY (0x1 << 2)
#define BM_CLPCR_ARM_CLK_DIS_ON_LPM (0x1 << 5)
#define BM_CLPCR_SBYOS (0x1 << 6)
#define BM_CLPCR_DIS_REF_OSC (0x1 << 7)
#define BM_CLPCR_VSTBY (0x1 << 8)
#define BP_CLPCR_STBY_COUNT 9
#define BM_CLPCR_STBY_COUNT (0x3 << 9)
#define BM_CLPCR_COSC_PWRDOWN (0x1 << 11)
#define BM_CLPCR_WB_PER_AT_LPM (0x1 << 16)
#define BM_CLPCR_WB_CORE_AT_LPM (0x1 << 17)
#define BM_CLPCR_BYP_MMDC_CH0_LPM_HS (0x1 << 19)
#define BM_CLPCR_BYP_MMDC_CH1_LPM_HS (0x1 << 21)
#define BM_CLPCR_MASK_CORE0_WFI (0x1 << 22)
#define BM_CLPCR_MASK_CORE1_WFI (0x1 << 23)
#define BM_CLPCR_MASK_CORE2_WFI (0x1 << 24)
#define BM_CLPCR_MASK_CORE3_WFI (0x1 << 25)
#define BM_CLPCR_MASK_SCU_IDLE (0x1 << 26)
#define BM_CLPCR_MASK_L2CC_IDLE (0x1 << 27)
#define CGPR 0x64
#define BM_CGPR_CHICKEN_BIT (0x1 << 17)
static void __iomem *ccm_base;
void imx6q_set_chicken_bit(void)
{
u32 val = readl_relaxed(ccm_base + CGPR);
val |= BM_CGPR_CHICKEN_BIT;
writel_relaxed(val, ccm_base + CGPR);
}
static void imx6q_enable_rbc(bool enable)
{
u32 val;
/*
* need to mask all interrupts in GPC before
* operating RBC configurations
*/
imx_gpc_mask_all();
/* configure RBC enable bit */
val = readl_relaxed(ccm_base + CCR);
val &= ~BM_CCR_RBC_EN;
val |= enable ? BM_CCR_RBC_EN : 0;
writel_relaxed(val, ccm_base + CCR);
/* configure RBC count */
val = readl_relaxed(ccm_base + CCR);
val &= ~BM_CCR_RBC_BYPASS_COUNT;
val |= enable ? BM_CCR_RBC_BYPASS_COUNT : 0;
writel(val, ccm_base + CCR);
/*
* need to delay at least 2 cycles of CKIL(32K)
* due to hardware design requirement, which is
* ~61us, here we use 65us for safe
*/
udelay(65);
/* restore GPC interrupt mask settings */
imx_gpc_restore_all();
}
static void imx6q_enable_wb(bool enable)
{
u32 val;
/* configure well bias enable bit */
val = readl_relaxed(ccm_base + CLPCR);
val &= ~BM_CLPCR_WB_PER_AT_LPM;
val |= enable ? BM_CLPCR_WB_PER_AT_LPM : 0;
writel_relaxed(val, ccm_base + CLPCR);
/* configure well bias count */
val = readl_relaxed(ccm_base + CCR);
val &= ~BM_CCR_WB_COUNT;
val |= enable ? BM_CCR_WB_COUNT : 0;
writel_relaxed(val, ccm_base + CCR);
}
int imx6q_set_lpm(enum mxc_cpu_pwr_mode mode)
{
struct irq_desc *iomuxc_irq_desc;
u32 val = readl_relaxed(ccm_base + CLPCR);
val &= ~BM_CLPCR_LPM;
switch (mode) {
case WAIT_CLOCKED:
break;
case WAIT_UNCLOCKED:
val |= 0x1 << BP_CLPCR_LPM;
val |= BM_CLPCR_ARM_CLK_DIS_ON_LPM;
break;
case STOP_POWER_ON:
val |= 0x2 << BP_CLPCR_LPM;
break;
case WAIT_UNCLOCKED_POWER_OFF:
val |= 0x1 << BP_CLPCR_LPM;
val &= ~BM_CLPCR_VSTBY;
val &= ~BM_CLPCR_SBYOS;
break;
case STOP_POWER_OFF:
val |= 0x2 << BP_CLPCR_LPM;
val |= 0x3 << BP_CLPCR_STBY_COUNT;
val |= BM_CLPCR_VSTBY;
val |= BM_CLPCR_SBYOS;
if (cpu_is_imx6sl()) {
val |= BM_CLPCR_BYPASS_PMIC_READY;
val |= BM_CLPCR_BYP_MMDC_CH0_LPM_HS;
} else {
val |= BM_CLPCR_BYP_MMDC_CH1_LPM_HS;
}
break;
default:
return -EINVAL;
}
/*
* ERR007265: CCM: When improper low-power sequence is used,
* the SoC enters low power mode before the ARM core executes WFI.
*
* Software workaround:
* 1) Software should trigger IRQ #32 (IOMUX) to be always pending
* by setting IOMUX_GPR1_GINT.
* 2) Software should then unmask IRQ #32 in GPC before setting CCM
* Low-Power mode.
* 3) Software should mask IRQ #32 right after CCM Low-Power mode
* is set (set bits 0-1 of CCM_CLPCR).
*/
iomuxc_irq_desc = irq_to_desc(32);
imx_gpc_irq_unmask(&iomuxc_irq_desc->irq_data);
writel_relaxed(val, ccm_base + CLPCR);
imx_gpc_irq_mask(&iomuxc_irq_desc->irq_data);
return 0;
}
static int imx6q_suspend_finish(unsigned long val)
{
cpu_do_idle();
return 0;
}
static int imx6q_pm_enter(suspend_state_t state)
{
switch (state) {
case PM_SUSPEND_MEM:
imx6q_set_lpm(STOP_POWER_OFF);
imx6q_enable_wb(true);
imx6q_enable_rbc(true);
imx_gpc_pre_suspend();
imx_anatop_pre_suspend();
imx_set_cpu_jump(0, v7_cpu_resume);
/* Zzz ... */
cpu_suspend(0, imx6q_suspend_finish);
if (cpu_is_imx6q() || cpu_is_imx6dl())
imx_smp_prepare();
imx_anatop_post_resume();
imx_gpc_post_resume();
imx6q_enable_rbc(false);
imx6q_enable_wb(false);
imx6q_set_lpm(WAIT_CLOCKED);
break;
default:
return -EINVAL;
}
return 0;
}
static const struct platform_suspend_ops imx6q_pm_ops = {
.enter = imx6q_pm_enter,
.valid = suspend_valid_only_mem,
};
void __init imx6q_pm_set_ccm_base(void __iomem *base)
{
ccm_base = base;
}
void __init imx6q_pm_init(void)
{
struct regmap *gpr;
WARN_ON(!ccm_base);
/*
* This is for SW workaround step #1 of ERR007265, see comments
* in imx6q_set_lpm for details of this errata.
* Force IOMUXC irq pending, so that the interrupt to GPC can be
* used to deassert dsm_request signal when the signal gets
* asserted unexpectedly.
*/
gpr = syscon_regmap_lookup_by_compatible("fsl,imx6q-iomuxc-gpr");
if (!IS_ERR(gpr))
regmap_update_bits(gpr, IOMUXC_GPR1, IMX6Q_GPR1_GINT,
IMX6Q_GPR1_GINT);
/* Set initial power mode */
imx6q_set_lpm(WAIT_CLOCKED);
suspend_set_ops(&imx6q_pm_ops);
}
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