linux-kernel - Re: [PATCH v4 2/2] memory: ti-emif-sram: introduce relocatable suspend/resume handlers

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Date:   Tue, 3 Oct 2017 10:14:23 -0500
From:   Dave Gerlach <d-gerlach@...com>
To:     Russell King - ARM Linux <linux@...linux.org.uk>
CC:     Tony Lindgren <tony@...mide.com>,
        Santosh Shilimkar <ssantosh@...nel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-omap@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <devicetree@...r.kernel.org>, Rob Herring <robh+dt@...nel.org>,
        Keerthy J <j-keerthy@...com>, Johan Hovold <johan@...nel.org>
Subject: Re: [PATCH v4 2/2] memory: ti-emif-sram: introduce relocatable
 suspend/resume handlers

On 10/02/2017 10:34 AM, Dave Gerlach wrote:
> Russell,
> On 09/28/2017 03:38 AM, Russell King - ARM Linux wrote:
>> On Tue, Sep 26, 2017 at 07:03:55PM -0500, Dave Gerlach wrote:
>>> diff --git a/drivers/memory/emif-asm-offsets.c b/drivers/memory/emif-asm-offsets.c
>>> new file mode 100644
>>> index 000000000000..bdb153c9e948
>>> --- /dev/null
>>> +++ b/drivers/memory/emif-asm-offsets.c
>>> @@ -0,0 +1,22 @@
>>> +/*
>>> + * TI AM33XX EMIF PM Assembly Offsets
>>> + *
>>> + * Copyright (C) 2016-2017 Texas Instruments 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 version 2.
>>> + *
>>> + * This program is distributed "as is" WITHOUT ANY WARRANTY of any
>>> + * kind, whether express or implied; without even the implied warranty
>>> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
>>> + * GNU General Public License for more details.
>>> + */
>>> +#include <linux/ti-emif-sram.h>
>>> +
>>> +int main(void)
>>> +{
>>> +	ti_emif_offsets();
>>> +
>>> +	return 0;
>>> +}
>>
>> ...
>>
>>> +#if defined(CONFIG_SOC_AM33XX) || defined(CONFIG_SOC_AM43XX)
>>> +static inline void ti_emif_offsets(void)
>>> +{
>>> +	DEFINE(EMIF_SDCFG_VAL_OFFSET,
>>> +	       offsetof(struct emif_regs_amx3, emif_sdcfg_val));
>>> +	DEFINE(EMIF_TIMING1_VAL_OFFSET,
>>> +	       offsetof(struct emif_regs_amx3, emif_timing1_val));
>>> +	DEFINE(EMIF_TIMING2_VAL_OFFSET,
>>> +	       offsetof(struct emif_regs_amx3, emif_timing2_val));
>>> +	DEFINE(EMIF_TIMING3_VAL_OFFSET,
>>> +	       offsetof(struct emif_regs_amx3, emif_timing3_val));
>>> +	DEFINE(EMIF_REF_CTRL_VAL_OFFSET,
>>> +	       offsetof(struct emif_regs_amx3, emif_ref_ctrl_val));
>>> +	DEFINE(EMIF_ZQCFG_VAL_OFFSET,
>>> +	       offsetof(struct emif_regs_amx3, emif_zqcfg_val));
>>> +	DEFINE(EMIF_PMCR_VAL_OFFSET,
>>> +	       offsetof(struct emif_regs_amx3, emif_pmcr_val));
>>> +	DEFINE(EMIF_PMCR_SHDW_VAL_OFFSET,
>>> +	       offsetof(struct emif_regs_amx3, emif_pmcr_shdw_val));
>>> +	DEFINE(EMIF_RD_WR_LEVEL_RAMP_CTRL_OFFSET,
>>> +	       offsetof(struct emif_regs_amx3, emif_rd_wr_level_ramp_ctrl));
>>> +	DEFINE(EMIF_RD_WR_EXEC_THRESH_OFFSET,
>>> +	       offsetof(struct emif_regs_amx3, emif_rd_wr_exec_thresh));
>>> +	DEFINE(EMIF_COS_CONFIG_OFFSET,
>>> +	       offsetof(struct emif_regs_amx3, emif_cos_config));
>>> +	DEFINE(EMIF_PRIORITY_TO_COS_MAPPING_OFFSET,
>>> +	       offsetof(struct emif_regs_amx3, emif_priority_to_cos_mapping));
>>> +	DEFINE(EMIF_CONNECT_ID_SERV_1_MAP_OFFSET,
>>> +	       offsetof(struct emif_regs_amx3, emif_connect_id_serv_1_map));
>>> +	DEFINE(EMIF_CONNECT_ID_SERV_2_MAP_OFFSET,
>>> +	       offsetof(struct emif_regs_amx3, emif_connect_id_serv_2_map));
>>> +	DEFINE(EMIF_OCP_CONFIG_VAL_OFFSET,
>>> +	       offsetof(struct emif_regs_amx3, emif_ocp_config_val));
>>> +	DEFINE(EMIF_LPDDR2_NVM_TIM_OFFSET,
>>> +	       offsetof(struct emif_regs_amx3, emif_lpddr2_nvm_tim));
>>> +	DEFINE(EMIF_LPDDR2_NVM_TIM_SHDW_OFFSET,
>>> +	       offsetof(struct emif_regs_amx3, emif_lpddr2_nvm_tim_shdw));
>>> +	DEFINE(EMIF_DLL_CALIB_CTRL_VAL_OFFSET,
>>> +	       offsetof(struct emif_regs_amx3, emif_dll_calib_ctrl_val));
>>> +	DEFINE(EMIF_DLL_CALIB_CTRL_VAL_SHDW_OFFSET,
>>> +	       offsetof(struct emif_regs_amx3, emif_dll_calib_ctrl_val_shdw));
>>> +	DEFINE(EMIF_DDR_PHY_CTLR_1_OFFSET,
>>> +	       offsetof(struct emif_regs_amx3, emif_ddr_phy_ctlr_1));
>>> +	DEFINE(EMIF_EXT_PHY_CTRL_VALS_OFFSET,
>>> +	       offsetof(struct emif_regs_amx3, emif_ext_phy_ctrl_vals));
>>> +	DEFINE(EMIF_REGS_AMX3_SIZE, sizeof(struct emif_regs_amx3));
>>> +
>>> +	BLANK();
>>> +
>>> +	DEFINE(EMIF_PM_BASE_ADDR_VIRT_OFFSET,
>>> +	       offsetof(struct ti_emif_pm_data, ti_emif_base_addr_virt));
>>> +	DEFINE(EMIF_PM_BASE_ADDR_PHYS_OFFSET,
>>> +	       offsetof(struct ti_emif_pm_data, ti_emif_base_addr_phys));
>>> +	DEFINE(EMIF_PM_CONFIG_OFFSET,
>>> +	       offsetof(struct ti_emif_pm_data, ti_emif_sram_config));
>>> +	DEFINE(EMIF_PM_REGS_VIRT_OFFSET,
>>> +	       offsetof(struct ti_emif_pm_data, regs_virt));
>>> +	DEFINE(EMIF_PM_REGS_PHYS_OFFSET,
>>> +	       offsetof(struct ti_emif_pm_data, regs_phys));
>>> +	DEFINE(EMIF_PM_DATA_SIZE, sizeof(struct ti_emif_pm_data));
>>> +
>>> +	BLANK();
>>> +
>>> +	DEFINE(EMIF_PM_SAVE_CONTEXT_OFFSET,
>>> +	       offsetof(struct ti_emif_pm_functions, save_context));
>>> +	DEFINE(EMIF_PM_RESTORE_CONTEXT_OFFSET,
>>> +	       offsetof(struct ti_emif_pm_functions, restore_context));
>>> +	DEFINE(EMIF_PM_ENTER_SR_OFFSET,
>>> +	       offsetof(struct ti_emif_pm_functions, enter_sr));
>>> +	DEFINE(EMIF_PM_EXIT_SR_OFFSET,
>>> +	       offsetof(struct ti_emif_pm_functions, exit_sr));
>>> +	DEFINE(EMIF_PM_ABORT_SR_OFFSET,
>>> +	       offsetof(struct ti_emif_pm_functions, abort_sr));
>>> +	DEFINE(EMIF_PM_FUNCTIONS_SIZE, sizeof(struct ti_emif_pm_functions));
>>> +}
>>> +#else
>>> +static inline void ti_emif_offsets(void) {}
>>> +#endif
>>
>> Any reason the above can't be part of emif-asm-offsets.c ?
>>
> 
> Yes that's a good point. I was focused on moving the macros and didn't think
> about why I hid everything away in the header in the first place, to avoid
> cluttering the global asm-offsets.c. Now that we have our own file there's no
> reason for this, I will fix this and the kbuild robot issue and send v5. I can
> simplify the makefile more which will avoid that build error.

On second thought, perhaps it is best we keep these offsets in the header so
that they can be easily included for generation in the pm-asm-offsets header.

Before, everything was generated in the top-level asm-offsets.h so I could
easily access all macros from ti-emif-sram-pm.S and also the sleep33xx.S found
here [1]. Now I can generate emif-asm-offsets.h and pm-asm-offsets.h as separate
files but the sleep33xx.S code requires the macros from both, and because
emif-asm-offsets.h is generated at build it is hard to describe the build
dependency from the arch/arm/mach-omap2/Makefile to a generated header in
drivers/memory.

The cleanest solution I have found is to include the emif macros in
pm-asm-offsets.h directly by placing ti_emif_offsets() in the c file used to
generate the PM macros. Next version I send will do it this way unless there is
an objection.

Regards,
Dave

[1] https://www.spinics.net/lists/arm-kernel/msg595934.html

> 
> Regards,
> Dave
>