[PATCH 3/4] powerpc: pm: add EPU FSM configuration for deep sleep
scottwood at freescale.com
Sat Aug 1 10:41:51 AEST 2015
On Fri, 2015-07-31 at 20:53 +0800, Chenhui Zhao wrote:
> In the last stage of deep sleep, software will trigger a Finite
> State Machine (FSM) to control the hardware precedure, such as
> board isolation, killing PLLs, removing power, and so on.
> When the system is waked up by an interrupt, the FSM controls the
> hardware to complete the early resume precedure.
> This patch configure the EPU FSM preparing for deep sleep.
> Signed-off-by: Chenhui Zhao <chenhui.zhao at freescale.com>
> arch/powerpc/platforms/85xx/Makefile | 2 +-
> arch/powerpc/platforms/85xx/sleep_fsm.c | 256
> arch/powerpc/platforms/85xx/sleep_fsm.h | 104 +++++++++++++
> 3 files changed, 361 insertions(+), 1 deletion(-)
> create mode 100644 arch/powerpc/platforms/85xx/sleep_fsm.c
> create mode 100644 arch/powerpc/platforms/85xx/sleep_fsm.h
When I asked why this was in drivers/platform, you said it was to share
with LS1, and that the values used were the same -- so why did you move it to
 Note that other proposed patches create a drivers/soc/fsl instead of
drivers/platform/fsl... We need one of them, not both.
> +void fsl_fsm_setup(void __iomem *base, struct fsm_reg_vals *val)
> + struct fsm_reg_vals *data = val;
> + BUG_ON(!base || !data);
This BUG_ON is useless. If one of those is NULL you'll get an oops anyway.
> diff --git a/arch/powerpc/platforms/85xx/sleep_fsm.h
> new file mode 100644
> index 0000000..2c60b40
> --- /dev/null
> +++ b/arch/powerpc/platforms/85xx/sleep_fsm.h
> @@ -0,0 +1,104 @@
> + * Freescale deep sleep FSM (finite-state machine) configuration
> + *
> + * Copyright 2015 Freescale Semiconductor Inc.
> + *
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms of the GNU General Public License as published by the
> + * Free Software Foundation; either version 2 of the License, or (at your
> + * option) any later version.
> + */
> +#ifndef _FSL_SLEEP_FSM_H
> +#define _FSL_SLEEP_FSM_H
> +#define FSL_STRIDE_4B 4
> +#define FSL_STRIDE_8B 8
Why not just use 4/8 directly?
> +/* Block offsets */
> +#define RCPM_BLOCK_OFFSET 0x00022000
> +#define EPU_BLOCK_OFFSET 0x00000000
> +#define NPC_BLOCK_OFFSET 0x00001000
I thought you said OK to not putting these offsets in the kernel source...
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