Re: [PATCH v6 4/7] ARM: rockchip: add suspend and resume for RK3288

[Kevin Hilman]

Chris Zhong <zyw@xxxxxxxxxxxxxx> writes:

> It's a basic version of suspend and resume for rockchip,
> it only support RK3288 now.
>
> Signed-off-by: Tony Xie <xxx@xxxxxxxxxxxxxx>
> Signed-off-by: Chris Zhong <zyw@xxxxxxxxxxxxxx>
> Tested-by: Doug Anderson <dianders@xxxxxxxxxxxx>
> Reviewed-by: Doug Anderson <dianders@xxxxxxxxxxxx>
>
> ---
>
> Changes in v6:
> - get rid of the save/restore of SRAM
> - doing the copy of resume code once at init time
> - remove ROCKCHIP_ARM_OFF_LOGIC_DEEP from rk3288_fill_in_bootram
> - add of_platform_populate in rockchip_dt_init
>
> Changes in v5:
> - use rk3288_bootram_sz for memcpy size
> - fixed error of sram save and restore
>
> Changes in v4:
> - remove grf regmap
>
> Changes in v3:
> - move the pinmux of gpio6_c6 save and restore to pinctrl-rockchip
>
> Changes in v2:
> - add the regulator calls in prepare and finish.
> - add the pinmux of gpio6_c6 save and restore
>
>  arch/arm/mach-rockchip/Makefile   |    1 +
>  arch/arm/mach-rockchip/pm.c       |  278 +++++++++++++++++++++++++++++++++++++
>  arch/arm/mach-rockchip/pm.h       |  103 ++++++++++++++
>  arch/arm/mach-rockchip/rockchip.c |    8 ++
>  arch/arm/mach-rockchip/sleep.S    |   90 ++++++++++++
>  5 files changed, 480 insertions(+)
>  create mode 100644 arch/arm/mach-rockchip/pm.c
>  create mode 100644 arch/arm/mach-rockchip/pm.h
>  create mode 100644 arch/arm/mach-rockchip/sleep.S
>
> diff --git a/arch/arm/mach-rockchip/Makefile b/arch/arm/mach-rockchip/Makefile
> index b29d8ea..5c3a9b2 100644
> --- a/arch/arm/mach-rockchip/Makefile
> +++ b/arch/arm/mach-rockchip/Makefile
> @@ -1,4 +1,5 @@
>  CFLAGS_platsmp.o := -march=armv7-a
>  
>  obj-$(CONFIG_ARCH_ROCKCHIP) += rockchip.o
> +obj-$(CONFIG_PM_SLEEP) += pm.o sleep.o
>  obj-$(CONFIG_SMP) += headsmp.o platsmp.o
> diff --git a/arch/arm/mach-rockchip/pm.c b/arch/arm/mach-rockchip/pm.c
> new file mode 100644
> index 0000000..0cf3128
> --- /dev/null
> +++ b/arch/arm/mach-rockchip/pm.c
> @@ -0,0 +1,278 @@
> +/*
> + * Copyright (c) 2014, Fuzhou Rockchip Electronics Co., Ltd
> + * Author: Tony Xie <tony.xie@xxxxxxxxxxxxxx>
> + *
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms and conditions of the GNU General Public License,
> + * version 2, as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope it will be useful, but WITHOUT
> + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
> + * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
> + * more details.
> + *
> + */
> +
> +#include <linux/init.h>
> +#include <linux/io.h>
> +#include <linux/kernel.h>
> +#include <linux/of.h>
> +#include <linux/of_address.h>
> +#include <linux/regmap.h>
> +#include <linux/suspend.h>
> +#include <linux/mfd/syscon.h>
> +#include <linux/regulator/machine.h>
> +
> +#include <asm/cacheflush.h>
> +#include <asm/tlbflush.h>
> +#include <asm/suspend.h>
> +
> +#include "pm.h"
> +
> +struct rockchip_pm_device_id {
> +	const char *compatible;
> +	const struct platform_suspend_ops *ops;
> +	int (*init)(void);
> +};
> +
> +static void __iomem *rk3288_bootram_base;
> +static phys_addr_t rk3288_bootram_phy;
> +
> +static struct regmap *pmu_regmap;
> +static struct regmap *sgrf_regmap;
> +
> +static inline u32 rk3288_l2_config(void)
> +{
> +	u32 l2ctlr;
> +
> +	asm("mrc p15, 1, %0, c9, c0, 2" : "=r" (l2ctlr));
> +	return l2ctlr;
> +}
> +

> +static void rk3288_fill_in_bootram(u32 level)

This function name no longer reflects what it does...

> +{
> +	rkpm_bootdata_cpusp = rk3288_bootram_phy + (SZ_4K - 8);
> +	rkpm_bootdata_cpu_code = virt_to_phys(cpu_resume);
> +
> +	rkpm_bootdata_l2ctlr_f  = 1;
> +	rkpm_bootdata_l2ctlr = rk3288_l2_config();
> +
> +	rkpm_bootdata_ddr_code = 0;

Already initialized to 0 in the resume code.

> +}

In addition, you're no longer copying the resume code to SRAM, but this
function writes values into the version of resume code that's in memory.
IOW, this function is being called for every suspend cycle, but has no
effect since the resume code has already been copied to SRAM.

Seems to me like this whole 'fill_in_bootram()' needs to go away, and be
replaced by a single setup at init time.

> +static u32 rk3288_pmu_pwr_mode_con;
> +static u32 rk3288_sgrf_soc_con0;

Minor nit, and it's up to Heiko's preference here, but it's generally
preferred to have global variables like  this at the top of the file,
not interspersed with the code.

Also, I'm not sure if you expect the number of registers that need
saving to grow here, but regmap provides a regcache facility for keeping
copies of things that may be useful.  Probably not worth the over head
for a single register in each of these regmaps, but worth exploring if
this is going to grow.

> +static void rk3288_slp_mode_set(int level)
> +{
> +	u32 mode_set, mode_set1;
> +
> +	regmap_read(sgrf_regmap, RK3288_SGRF_SOC_CON0, &rk3288_sgrf_soc_con0);
> +
> +	regmap_read(pmu_regmap, RK3288_PMU_PWRMODE_CON,
> +		    &rk3288_pmu_pwr_mode_con);
> +
> +	/* set bit 8 so that system will resume to FAST_BOOT_ADDR */
> +	regmap_write(sgrf_regmap, RK3288_SGRF_SOC_CON0,
> +		     BIT(SGRF_FAST_BOOT_EN) | BIT(SGRF_FAST_BOOT_EN + 16));

Comment says "bit 8", but code says bit 8 and bit 24, and if bit 24 is
needed, it should probably get its own #define in the header.

> +
> +	/* booting address of resuming system is from this register value */
> +	regmap_write(sgrf_regmap, RK3288_SGRF_FAST_BOOT_ADDR,
> +		     rk3288_bootram_phy);
> +
> +	regmap_write(pmu_regmap, RK3288_PMU_WAKEUP_CFG1,
> +		     PMU_ARMINT_WAKEUP_EN);
> +
> +	mode_set = BIT(PMU_GLOBAL_INT_DISABLE) | BIT(PMU_L2FLUSH_EN) |
> +		   BIT(PMU_SREF0_ENTER_EN) | BIT(PMU_SREF1_ENTER_EN) |
> +		   BIT(PMU_DDR0_GATING_EN) | BIT(PMU_DDR1_GATING_EN) |
> +		   BIT(PMU_PWR_MODE_EN) | BIT(PMU_CHIP_PD_EN) |
> +		   BIT(PMU_SCU_EN);
> +
> +	mode_set1 = BIT(PMU_CLR_CORE) | BIT(PMU_CLR_CPUP);
> +
> +	if (level == ROCKCHIP_ARM_OFF_LOGIC_DEEP) {
> +		/* arm off, logic deep sleep */
> +		mode_set |= BIT(PMU_BUS_PD_EN) |
> +			    BIT(PMU_DDR1IO_RET_EN) | BIT(PMU_DDR0IO_RET_EN) |
> +			    BIT(PMU_OSC_24M_DIS) | BIT(PMU_PMU_USE_LF) |
> +			    BIT(PMU_ALIVE_USE_LF) | BIT(PMU_PLL_PD_EN);
> +
> +		mode_set1 |= BIT(PMU_CLR_ALIVE) | BIT(PMU_CLR_BUS) |
> +			     BIT(PMU_CLR_PERI) | BIT(PMU_CLR_DMA);
> +
> +	} else {
> +		/*
> +		 * arm off, logic normal
> +		 * if pmu_clk_core_src_gate_en is not set,
> +		 * wakeup will be error
> +		 */
> +		mode_set |= BIT(PMU_CLK_CORE_SRC_GATE_EN);
> +	}
> +
> +	regmap_write(pmu_regmap, RK3288_PMU_PWRMODE_CON, mode_set);
> +

extra blank line not needed

> +	regmap_write(pmu_regmap, RK3288_PMU_PWRMODE_CON1, mode_set1);
> +}
> +
> +static void rk3288_slp_mode_set_resume(void)
> +{
> +	regmap_write(pmu_regmap, RK3288_PMU_PWRMODE_CON,
> +		     rk3288_pmu_pwr_mode_con);

extra blank line

> +	regmap_write(sgrf_regmap, RK3288_SGRF_SOC_CON0,
> +		     rk3288_sgrf_soc_con0 | BIT(SGRF_FAST_BOOT_EN + 16));

here is magic bit 24 again.

> +}
> +
> +/*
> + * level: used to control the level of sleep mode.
> + * ROCKCHIP_ARM_OFF_LOGIC_NORMAL : arm is off and logic is in normal
> + * sleep mode.
> + * ROCKCHIP_ARM_OFF_LOGIC_DEEP : arm is off and logic is in deep sleep mode

IMO, these descriptions don't add any value over the already descriptive
names of the #defines

> + */
> +static void rk3288_save_settings(u32 level)
> +{
> +	rk3288_fill_in_bootram(level);
> +
> +	rk3288_slp_mode_set(level);
> +}
> +
> +static void rk3288_restore_settings(void)
> +{
> +	rk3288_slp_mode_set_resume();
> +}

These 'save' and 'restore' functions seem like unnecessary levels of
redirection, especially if 'fill_in_bootram' goes away.  

IMO, probably best to just move the calls into _suspend_enter().

> +static int rockchip_lpmode_enter(unsigned long arg)
> +{
> +	flush_cache_all();
> +
> +	cpu_do_idle();
> +
> +	pr_info("Failed to suspend the system\n");
> +
> +	return 1;
> +}
> +
> +static int rk3288_suspend_enter(suspend_state_t state)
> +{
> +	local_fiq_disable();
> +
> +	rk3288_save_settings(ROCKCHIP_ARM_OFF_LOGIC_NORMAL);
> +
> +	cpu_suspend(0, rockchip_lpmode_enter);
> +
> +	rk3288_restore_settings();
> +
> +	local_fiq_enable();
> +
> +	return 0;
> +}
> +
> +static int rk3288_suspend_prepare(void)
> +{
> +	return regulator_suspend_prepare(PM_SUSPEND_MEM);
> +}
> +
> +static void rk3288_suspend_finish(void)
> +{
> +	if (regulator_suspend_finish())
> +		pr_warn("suspend finish failed\n");
> +}
> +
> +static int rk3288_suspend_iomap(void)
> +{
> +	struct device_node *node;
> +	struct resource res;
> +
> +	node = of_find_compatible_node(NULL, NULL, "rockchip,rk3288-pmu-sram");
> +	if (!node) {
> +		pr_err("%s: could not find bootram dt node\n", __func__);
> +		return -1;
> +	}
> +
> +	rk3288_bootram_base = of_iomap(node, 0);
> +	if (!rk3288_bootram_base) {
> +		pr_err("%s: could not map bootram base\n", __func__);
> +		return -1;
> +	}
> +
> +	if (of_address_to_resource(node, 0, &res)) {
> +		pr_err("%s: could not get bootram phy addr\n", __func__);
> +		return -1;
> +	}
> +
> +	rk3288_bootram_phy = res.start;
> +
> +	/* copy resume code and data to bootsram */
> +	memcpy(rk3288_bootram_base, rockchip_slp_cpu_resume,
> +	       rk3288_bootram_sz);
> +
> +	return 0;
> +}
> +
> +static int rk3288_suspend_init(void)
> +{
> +	int ret;
> +
> +	pmu_regmap = syscon_regmap_lookup_by_compatible(
> +				"rockchip,rk3288-pmu");
> +
> +	if (IS_ERR(pmu_regmap)) {
> +		pr_err("%s: could not find pmu regmap\n", __func__);
> +		return -1;
> +	}
> +
> +	sgrf_regmap = syscon_regmap_lookup_by_compatible(
> +				"rockchip,rk3288-sgrf");
> +
> +	if (IS_ERR(sgrf_regmap)) {
> +		pr_err("%s: could not find sgrf regmap\n", __func__);
> +		return -1;
> +	}
> +
> +	ret = rk3288_suspend_iomap();
> +
> +	return ret;
> +}
> +
> +static const struct platform_suspend_ops rk3288_suspend_ops = {
> +	.enter   = rk3288_suspend_enter,
> +	.valid   = suspend_valid_only_mem,
> +	.prepare = rk3288_suspend_prepare,
> +	.finish  = rk3288_suspend_finish,
> +};
> +
> +static const struct rockchip_pm_device_id rockchip_pm_dt_match[] __initconst = {
> +	{
> +		.compatible = "rockchip,rk3288",
> +		.ops = &rk3288_suspend_ops,
> +		.init = rk3288_suspend_init,
> +	},
> +	{ /* sentinel */ },
> +};
> +
> +void __init rockchip_suspend_init(void)
> +{
> +	const struct rockchip_pm_device_id *matches =
> +		rockchip_pm_dt_match;
> +
> +	while (matches->compatible && matches->ops) {
> +		if (of_machine_is_compatible(matches->compatible))
> +			break;
> +		matches++;
> +	}
> +
> +	if (!matches->compatible || !matches->ops) {
> +		pr_err("%s:there is not a machine matched\n", __func__);
> +		return;
> +	}
> +
> +	if (matches->init) {
> +		if (matches->init()) {
> +			pr_err("%s: matches init error\n", __func__);
> +			return;
> +		}
> +	}
> +
> +	suspend_set_ops(matches->ops);
> +}
> diff --git a/arch/arm/mach-rockchip/pm.h b/arch/arm/mach-rockchip/pm.h
> new file mode 100644
> index 0000000..781ea9d
> --- /dev/null
> +++ b/arch/arm/mach-rockchip/pm.h
> @@ -0,0 +1,103 @@
> +/*
> + * Copyright (c) 2014, Fuzhou Rockchip Electronics Co., Ltd
> + * Author: Tony Xie <tony.xie@xxxxxxxxxxxxxx>
> + *
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms and conditions of the GNU General Public License,
> + * version 2, as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope it will be useful, but WITHOUT
> + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
> + * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
> + * more details.
> + */
> +
> +#ifndef __MACH_ROCKCHIP_PM_H
> +#define __MACH_ROCKCHIP_PM_H
> +
> +extern unsigned long rkpm_bootdata_cpusp;
> +extern unsigned long rkpm_bootdata_cpu_code;
> +extern unsigned long rkpm_bootdata_l2ctlr_f;
> +extern unsigned long rkpm_bootdata_l2ctlr;
> +extern unsigned long rkpm_bootdata_ddr_code;
> +extern unsigned long rkpm_bootdata_ddr_data;
> +extern unsigned long rk3288_bootram_sz;
> +/* The function selction of low power mode */
> +/* arm is off and logic is in normal sleep mode */
> +#define ROCKCHIP_ARM_OFF_LOGIC_NORMAL (0)
> +/* arm is off and logic is in deep sleep mode */
> +#define ROCKCHIP_ARM_OFF_LOGIC_DEEP (1)

These defines only seem to be used inside pm.c, so should be moved there
(and maybe turned into an enum?)

> +void rockchip_slp_cpu_resume(void);
> +void __init rockchip_suspend_init(void);
> +
> +/****** following is rk3288 defined **********/
> +#define RK3288_PMU_WAKEUP_CFG0          0x00
> +#define RK3288_PMU_WAKEUP_CFG1          0x04
> +#define RK3288_PMU_PWRMODE_CON          0x18
> +#define RK3288_PMU_OSC_CNT              0x20
> +#define RK3288_PMU_PLL_CNT              0x24
> +#define RK3288_PMU_STABL_CNT            0x28
> +#define RK3288_PMU_DDR0IO_PWRON_CNT     0x2c
> +#define RK3288_PMU_DDR1IO_PWRON_CNT     0x30
> +#define RK3288_PMU_CORE_PWRDWN_CNT      0x34
> +#define RK3288_PMU_CORE_PWRUP_CNT       0x38
> +#define RK3288_PMU_GPU_PWRDWN_CNT       0x3c
> +#define RK3288_PMU_GPU_PWRUP_CNT        0x40
> +#define RK3288_PMU_WAKEUP_RST_CLR_CNT   0x44
> +#define RK3288_PMU_PWRMODE_CON1         0x90
> +
> +#define RK3288_SGRF_SOC_CON0            (0x0000)
> +#define RK3288_SGRF_FAST_BOOT_ADDR      (0x0120)
> +#define SGRF_FAST_BOOT_EN (8)
> +
> +#define RK3288_CRU_MODE_CON (0x50)
> +#define RK3288_CRU_SEL0_CON (0x60)
> +#define RK3288_CRU_SEL1_CON (0x64)
> +#define RK3288_CRU_SEL10_CON (0x88)
> +#define RK3288_CRU_SEL33_CON (0xe4)
> +#define RK3288_CRU_SEL37_CON (0xf4)
> +
> +/* PMU_WAKEUP_CFG1 bits */
> +#define PMU_ARMINT_WAKEUP_EN BIT(0)
> +
> +enum rk3288_pwr_mode_con {
> +	PMU_PWR_MODE_EN = 0,
> +	PMU_CLK_CORE_SRC_GATE_EN,
> +	PMU_GLOBAL_INT_DISABLE,
> +	PMU_L2FLUSH_EN,
> +	PMU_BUS_PD_EN,
> +	PMU_A12_0_PD_EN,
> +	PMU_SCU_EN,
> +	PMU_PLL_PD_EN,
> +	PMU_CHIP_PD_EN, /* POWER OFF PIN ENABLE */
> +	PMU_PWROFF_COMB,
> +	PMU_ALIVE_USE_LF,
> +	PMU_PMU_USE_LF,
> +	PMU_OSC_24M_DIS,
> +	PMU_INPUT_CLAMP_EN,
> +	PMU_WAKEUP_RESET_EN,
> +	PMU_SREF0_ENTER_EN,
> +	PMU_SREF1_ENTER_EN,
> +	PMU_DDR0IO_RET_EN,
> +	PMU_DDR1IO_RET_EN,
> +	PMU_DDR0_GATING_EN,
> +	PMU_DDR1_GATING_EN,
> +	PMU_DDR0IO_RET_DE_REQ,
> +	PMU_DDR1IO_RET_DE_REQ
> +};
> +
> +enum rk3288_pwr_mode_con1 {
> +	PMU_CLR_BUS = 0,
> +	PMU_CLR_CORE,
> +	PMU_CLR_CPUP,
> +	PMU_CLR_ALIVE,
> +	PMU_CLR_DMA,
> +	PMU_CLR_PERI,
> +	PMU_CLR_GPU,
> +	PMU_CLR_VIDEO,
> +	PMU_CLR_HEVC,
> +	PMU_CLR_VIO,
> +};
> +
> +#endif /* __MACH_ROCKCHIP_PM_H */
> diff --git a/arch/arm/mach-rockchip/rockchip.c b/arch/arm/mach-rockchip/rockchip.c
> index 8ab9e0e..03ca842 100644
> --- a/arch/arm/mach-rockchip/rockchip.c
> +++ b/arch/arm/mach-rockchip/rockchip.c
> @@ -23,6 +23,13 @@
>  #include <asm/mach/map.h>
>  #include <asm/hardware/cache-l2x0.h>
>  #include "core.h"
> +#include "pm.h"
> +
> +static void __init rockchip_dt_init(void)
> +{
> +	rockchip_suspend_init();
> +	of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
> +}
>  
>  static const char * const rockchip_board_dt_compat[] = {
>  	"rockchip,rk2928",
> @@ -37,4 +44,5 @@ DT_MACHINE_START(ROCKCHIP_DT, "Rockchip Cortex-A9 (Device Tree)")
>  	.l2c_aux_val	= 0,
>  	.l2c_aux_mask	= ~0,
>  	.dt_compat	= rockchip_board_dt_compat,
> +	.init_machine	= rockchip_dt_init,
>  MACHINE_END
> diff --git a/arch/arm/mach-rockchip/sleep.S b/arch/arm/mach-rockchip/sleep.S
> new file mode 100644
> index 0000000..e1c5b8c
> --- /dev/null
> +++ b/arch/arm/mach-rockchip/sleep.S
> @@ -0,0 +1,90 @@
> +/*
> + * Copyright (c) 2014, Fuzhou Rockchip Electronics Co., Ltd
> + * Author: Tony Xie <tony.xie@xxxxxxxxxxxxxx>
> + *
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms and conditions of the GNU General Public License,
> + * version 2, as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope it will be useful, but WITHOUT
> + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
> + * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
> + * more details.
> + *
> + */
> +
> +#include <linux/linkage.h>
> +#include <asm/assembler.h>
> +#include <asm/memory.h>
> +
> +.data
> +/*
> + * this code will be copied from
> + * ddr to sram for system resumeing.
> + * so it is ".data section".
> + */
> +.align
> +
> +ENTRY(rockchip_slp_cpu_resume)
> +	setmode	PSR_I_BIT | PSR_F_BIT | SVC_MODE, r1  @ set svc, irqs off
> +	mrc	p15, 0, r1, c0, c0, 5
> +	and	r1, r1, #0xf
> +	cmp	r1, #0
> +	/* olny cpu0 can continue to run, the others is halt here */
> +	beq	cpu0run
> +secondary_loop:
> +	wfe
> +	b	secondary_loop
> +cpu0run:
> +	ldr	r3, rkpm_bootdata_l2ctlr_f
> +	cmp	r3, #0
> +	beq	sp_set
> +	ldr	r3, rkpm_bootdata_l2ctlr
> +	mcr	p15, 1, r3, c9, c0, 2
> +sp_set:
> +	ldr	sp, rkpm_bootdata_cpusp
> +
> +	ldr	r1, rkpm_bootdata_ddr_code
> +	cmp	r1, #0
> +	beq	res

In this series, 'ddr_code' is always zero, and othrewise unused.  I'd
suggest leaving it out of this series entirely for simplicity (and
readability) and add it back in a patch/series where it's actually used.

> +	ldr	r0, rkpm_bootdata_ddr_data
> +	blx	r1

And 'ddr_data' is entirely unused.

> +res:
> +	ldr	r1, rkpm_bootdata_cpu_code
> +	bx	r1
> +ENDPROC(rockchip_slp_cpu_resume)
> +
> +/* Parameters filled in by the kernel */
> +
> +/* Code to jump to for DDR resume code, or NULL */
> +	.global rkpm_bootdata_ddr_code
> +rkpm_bootdata_ddr_code:
> +	.long 0
> +
> +/* Data to pass to DDR resume data */
> +	.global rkpm_bootdata_ddr_data
> +rkpm_bootdata_ddr_data:
> +	.long 0
> +
> +/* Flag for whether to restore L2CTLR on resume */
> +	.global rkpm_bootdata_l2ctlr_f
> +rkpm_bootdata_l2ctlr_f:
> +	.long 0
> +
> +/* Saved L2CTLR to restore on resume */
> +	.global rkpm_bootdata_l2ctlr
> +rkpm_bootdata_l2ctlr:
> +	.long 0
> +
> +/* CPU resume SP addr */
> +	.globl rkpm_bootdata_cpusp
> +rkpm_bootdata_cpusp:
> +	.long 0
> +
> +/* CPU resume function (physical address) */
> +	.globl rkpm_bootdata_cpu_code
> +rkpm_bootdata_cpu_code:
> +	.long 0
> +
> +ENTRY(rk3288_bootram_sz)
> +        .word   . - rockchip_slp_cpu_resume

Kevin
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