Re: [PATCH v3 2/4] soc: mediatek: pwrap: add arbiter capability

[Matthias Brugger <matthias.bgg@xxxxxxxxx>]

On 21/09/2020 13:03, Hsin-Hsiung Wang wrote:
> Add arbiter capability for pwrap driver.

Can you provide a bit more verbose commit message, please.

> This patch is preparing for adding mt6873/8192 pwrap support.
>
> Signed-off-by: Hsin-Hsiung Wang <hsin-hsiung.wang@xxxxxxxxxxxx>
> ---
>   drivers/soc/mediatek/mtk-pmic-wrap.c | 57 ++++++++++++++++++++++++++++++------
>   1 file changed, 48 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/soc/mediatek/mtk-pmic-wrap.c b/drivers/soc/mediatek/mtk-pmic-wrap.c
> index c897205..149bf02 100644
> --- a/drivers/soc/mediatek/mtk-pmic-wrap.c
> +++ b/drivers/soc/mediatek/mtk-pmic-wrap.c
> @@ -25,10 +25,12 @@
>   
>   /* macro for wrapper status */
>   #define PWRAP_GET_WACS_RDATA(x)		(((x) >> 0) & 0x0000ffff)
> +#define PWRAP_GET_WACS_ARB_FSM(x)	(((x) >> 1) & 0x00000007)
>   #define PWRAP_GET_WACS_FSM(x)		(((x) >> 16) & 0x00000007)
>   #define PWRAP_GET_WACS_REQ(x)		(((x) >> 19) & 0x00000001)
>   #define PWRAP_STATE_SYNC_IDLE0		BIT(20)
>   #define PWRAP_STATE_INIT_DONE0		BIT(21)
> +#define PWRAP_STATE_INIT_DONE1		BIT(15)
>   
>   /* macro for WACS FSM */
>   #define PWRAP_WACS_FSM_IDLE		0x00
> @@ -74,6 +76,7 @@
>   #define PWRAP_CAP_DCM		BIT(2)
>   #define PWRAP_CAP_INT1_EN	BIT(3)
>   #define PWRAP_CAP_WDT_SRC1	BIT(4)
> +#define PWRAP_CAP_ARB		BIT(5)
>   
>   /* defines for slave device wrapper registers */
>   enum dew_regs {
> @@ -340,6 +343,8 @@ enum pwrap_regs {
>   	PWRAP_DCM_DBC_PRD,
>   	PWRAP_EINT_STA0_ADR,
>   	PWRAP_EINT_STA1_ADR,
> +	PWRAP_SWINF_2_WDATA_31_0,
> +	PWRAP_SWINF_2_RDATA_31_0,
>   
>   	/* MT2701 only regs */
>   	PWRAP_ADC_CMD_ADDR,
> @@ -1108,14 +1113,22 @@ static void pwrap_writel(struct pmic_wrapper *wrp, u32 val, enum pwrap_regs reg)
>   
>   static bool pwrap_is_fsm_idle(struct pmic_wrapper *wrp)
>   {
> -	u32 val = pwrap_readl(wrp, PWRAP_WACS2_RDATA);
> +	u32 val;
> +
> +	val = pwrap_readl(wrp, PWRAP_WACS2_RDATA);
> +	if (HAS_CAP(wrp->master->caps, PWRAP_CAP_ARB))
> +		return PWRAP_GET_WACS_ARB_FSM(val) == PWRAP_WACS_FSM_IDLE;
>   
>   	return PWRAP_GET_WACS_FSM(val) == PWRAP_WACS_FSM_IDLE;
>   }
>   
>   static bool pwrap_is_fsm_vldclr(struct pmic_wrapper *wrp)
>   {
> -	u32 val = pwrap_readl(wrp, PWRAP_WACS2_RDATA);
> +	u32 val;
> +
> +	val = pwrap_readl(wrp, PWRAP_WACS2_RDATA);
> +	if (HAS_CAP(wrp->master->caps, PWRAP_CAP_ARB))
> +		return PWRAP_GET_WACS_ARB_FSM(val) == PWRAP_WACS_FSM_WFVLDCLR;
>   
>   	return PWRAP_GET_WACS_FSM(val) == PWRAP_WACS_FSM_WFVLDCLR;
>   }
> @@ -1165,6 +1178,7 @@ static int pwrap_wait_for_state(struct pmic_wrapper *wrp,
>   static int pwrap_read16(struct pmic_wrapper *wrp, u32 adr, u32 *rdata)
>   {
>   	int ret;
> +	u32 val;
>   
>   	ret = pwrap_wait_for_state(wrp, pwrap_is_fsm_idle);
>   	if (ret) {
> @@ -1172,13 +1186,21 @@ static int pwrap_read16(struct pmic_wrapper *wrp, u32 adr, u32 *rdata)
>   		return ret;
>   	}
>   
> -	pwrap_writel(wrp, (adr >> 1) << 16, PWRAP_WACS2_CMD);
> +	if (HAS_CAP(wrp->master->caps, PWRAP_CAP_ARB))
> +		val = adr;
> +	else
> +		val = (adr >> 1) << 16;
> +	pwrap_writel(wrp, val, PWRAP_WACS2_CMD);
>   
>   	ret = pwrap_wait_for_state(wrp, pwrap_is_fsm_vldclr);
>   	if (ret)
>   		return ret;
>   
> -	*rdata = PWRAP_GET_WACS_RDATA(pwrap_readl(wrp, PWRAP_WACS2_RDATA));
> +	if (HAS_CAP(wrp->master->caps, PWRAP_CAP_ARB))
> +		val = pwrap_readl(wrp, PWRAP_SWINF_2_RDATA_31_0);
> +	else
> +		val = pwrap_readl(wrp, PWRAP_WACS2_RDATA);
> +	*rdata = PWRAP_GET_WACS_RDATA(val);
>   
>   	pwrap_writel(wrp, 1, PWRAP_WACS2_VLDCLR);
>   
> @@ -1228,8 +1250,13 @@ static int pwrap_write16(struct pmic_wrapper *wrp, u32 adr, u32 wdata)
>   		return ret;
>   	}
>   
> -	pwrap_writel(wrp, (1 << 31) | ((adr >> 1) << 16) | wdata,
> -		     PWRAP_WACS2_CMD);
> +	if (!HAS_CAP(wrp->master->caps, PWRAP_CAP_ARB)) {

Please switch if's so that we take the else branch on the arbiter not present 
case. Or the other way round, just make it uniform, where possible, of course.

> +		pwrap_writel(wrp, BIT(31) | ((adr >> 1) << 16) | wdata,
> +			     PWRAP_WACS2_CMD);
> +	} else {
> +		pwrap_writel(wrp, wdata, PWRAP_SWINF_2_WDATA_31_0);
> +		pwrap_writel(wrp, BIT(29) | adr, PWRAP_WACS2_CMD);
> +	}
>   
>   	return 0;
>   }
> @@ -2022,6 +2049,7 @@ MODULE_DEVICE_TABLE(of, of_pwrap_match_tbl);
>   static int pwrap_probe(struct platform_device *pdev)
>   {
>   	int ret, irq;
> +	u32 mask_done;
>   	struct pmic_wrapper *wrp;
>   	struct device_node *np = pdev->dev.of_node;
>   	const struct of_device_id *of_slave_id = NULL;
> @@ -2116,14 +2144,21 @@ static int pwrap_probe(struct platform_device *pdev)
>   		}
>   	}
>   
> -	if (!(pwrap_readl(wrp, PWRAP_WACS2_RDATA) & PWRAP_STATE_INIT_DONE0)) {
> +	if (HAS_CAP(wrp->master->caps, PWRAP_CAP_ARB))
> +		mask_done = PWRAP_STATE_INIT_DONE1;
> +	else
> +		mask_done = PWRAP_STATE_INIT_DONE0;
> +
> +	if (!(pwrap_readl(wrp, PWRAP_WACS2_RDATA) & mask_done)) {
>   		dev_dbg(wrp->dev, "initialization isn't finished\n");
>   		ret = -ENODEV;
>   		goto err_out2;
>   	}
>   
>   	/* Initialize watchdog, may not be done by the bootloader */
> -	pwrap_writel(wrp, 0xf, PWRAP_WDT_UNIT);
> +	if (!HAS_CAP(wrp->master->caps, PWRAP_CAP_ARB))
> +		pwrap_writel(wrp, 0xf, PWRAP_WDT_UNIT);
> +

Whats the connection between an arbiter being present and the watchdog?

Regards,
Matthias