linux-kernel - Re: [PATCH v3 3/8] soc: Mediatek: Add SCPSYS CPU power domain driver

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Message-ID: <20150805085034.GG18700@pengutronix.de>
Date:	Wed, 5 Aug 2015 10:50:34 +0200
From:	Sascha Hauer <s.hauer@...gutronix.de>
To:	Scott Shu <scott.shu@...iatek.com>
Cc:	Matthias Brugger <matthias.bgg@...il.com>,
	Mark Rutland <mark.rutland@....com>,
	devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, linux-mediatek@...ts.infradead.org,
	wsd_upstream@...iatek.com, loda.chou@...iatek.com,
	jades.shih@...iatek.com, Mars.Cheng@...iatek.com,
	scott.shu@...il.com
Subject: Re: [PATCH v3 3/8] soc: Mediatek: Add SCPSYS CPU power domain driver

On Tue, Aug 04, 2015 at 09:54:19PM +0800, Scott Shu wrote:
> This adds a CPU power domain driver for the Mediatek SCPSYS unit on
> MT6580.
> 
> Signed-off-by: Scott Shu <scott.shu@...iatek.com>
> ---
>  drivers/soc/mediatek/mtk-scpsys.c   |  250 +++++++++++++++++++++++++++++++++++
>  include/linux/soc/mediatek/scpsys.h |    9 ++
>  2 files changed, 259 insertions(+)
>  create mode 100644 include/linux/soc/mediatek/scpsys.h
> 
> diff --git a/drivers/soc/mediatek/mtk-scpsys.c b/drivers/soc/mediatek/mtk-scpsys.c
> index 43a79ed..ca0f2dd 100644
> --- a/drivers/soc/mediatek/mtk-scpsys.c
> +++ b/drivers/soc/mediatek/mtk-scpsys.c
> @@ -15,18 +15,30 @@
>  #include <linux/io.h>
>  #include <linux/kernel.h>
>  #include <linux/mfd/syscon.h>
> +#include <linux/of.h>
>  #include <linux/of_device.h>
> +#include <linux/of_address.h>
>  #include <linux/platform_device.h>
>  #include <linux/pm_domain.h>
>  #include <linux/regmap.h>
>  #include <linux/soc/mediatek/infracfg.h>
> +#include <linux/soc/mediatek/scpsys.h>
>  #include <dt-bindings/power/mt8173-power.h>
>  
> +#define SPM_POWERON_CONFIG_SET		0x0000
> +#define SPM_CA7_CPU0_PWR_CON		0x0200
>  #define SPM_VDE_PWR_CON			0x0210
>  #define SPM_MFG_PWR_CON			0x0214
> +#define SPM_CA7_CPU1_PWR_CON		0x0218
> +#define SPM_CA7_CPU2_PWR_CON		0x021c
> +#define SPM_CA7_CPU3_PWR_CON		0x0220
>  #define SPM_VEN_PWR_CON			0x0230
>  #define SPM_ISP_PWR_CON			0x0238
>  #define SPM_DIS_PWR_CON			0x023c
> +#define SPM_CA7_CPU0_L1_PDN		0x025c
> +#define SPM_CA7_CPU1_L1_PDN		0x0264
> +#define SPM_CA7_CPU2_L1_PDN		0x026c
> +#define SPM_CA7_CPU3_L1_PDN		0x0274
>  #define SPM_VEN2_PWR_CON		0x0298
>  #define SPM_AUDIO_PWR_CON		0x029c
>  #define SPM_MFG_2D_PWR_CON		0x02c0
> @@ -34,12 +46,20 @@
>  #define SPM_USB_PWR_CON			0x02cc
>  #define SPM_PWR_STATUS			0x060c
>  #define SPM_PWR_STATUS_2ND		0x0610
> +#define SPM_SLEEP_TIMER_STA		0x0720
>  
> +/* bit definition in SPM_CA7_CPUx_PWR_CON */
>  #define PWR_RST_B_BIT			BIT(0)
>  #define PWR_ISO_BIT			BIT(1)
>  #define PWR_ON_BIT			BIT(2)
>  #define PWR_ON_2ND_BIT			BIT(3)
>  #define PWR_CLK_DIS_BIT			BIT(4)
> +#define SRAM_CKISO_BIT			BIT(5)
> +#define SRAM_ISOINT_B_BIT		BIT(6)
> +
> +/* bit definition in SPM_CA7_CPUx_L1_PDN */
> +#define L1_PDN				BIT(0)
> +#define L1_PDN_ACK			BIT(8)
>  
>  #define PWR_STATUS_DISP			BIT(3)
>  #define PWR_STATUS_MFG			BIT(4)
> @@ -52,6 +72,28 @@
>  #define PWR_STATUS_AUDIO		BIT(24)
>  #define PWR_STATUS_USB			BIT(25)
>  
> +#define MT6580_MAX_CPUS			4
> +
> +#ifdef CONFIG_SMP
> +static DEFINE_SPINLOCK(spm_cpu_lock);
> +
> +static void __iomem *spm_cpu_base;
> +
> +static const u32 spm_cpu_pwr_con[MT6580_MAX_CPUS] = {
> +	SPM_CA7_CPU0_PWR_CON,
> +	SPM_CA7_CPU1_PWR_CON,
> +	SPM_CA7_CPU2_PWR_CON,
> +	SPM_CA7_CPU3_PWR_CON,
> +};
> +
> +static const u32 spm_cpu_l1_pdn[MT6580_MAX_CPUS] = {
> +	SPM_CA7_CPU0_L1_PDN,
> +	SPM_CA7_CPU1_L1_PDN,
> +	SPM_CA7_CPU2_L1_PDN,
> +	SPM_CA7_CPU3_L1_PDN,
> +};
> +#endif
> +
>  enum clk_id {
>  	MT8173_CLK_MM,
>  	MT8173_CLK_MFG,
> @@ -485,3 +527,211 @@ static struct platform_driver scpsys_drv = {
>  };
>  
>  module_platform_driver_probe(scpsys_drv, scpsys_probe);
> +
> +#define SPM_REGWR_EN		BIT(0)
> +#define SPM_PROJECT_CODE	0x0B16
> +
> +#ifdef CONFIG_SMP
> +int spm_cpu_mtcmos_on(int cpu)

The idea was that the code that the current driver has in
scpsys_power_on/scpsys_power_off is shared with this function. If we
don't do this then it indeed doesn't make much sense to put it into the
same file.

>From what I see we would need to change the prototype to something like

static int __scpsys_power_on(struct scp_domain_data *)

(maybe with some additional base addresses and stuff)

struct scp_domain_data would additionally need sram_isoint_b and sram_ckiso
members.

Sascha

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