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Mon, 21 Sep 2020 09:48:40 -0700 (PDT) Received: from ziggy.stardust ([213.195.113.201]) by smtp.gmail.com with ESMTPSA id o4sm20889655wru.55.2020.09.21.09.48.39 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 21 Sep 2020 09:48:40 -0700 (PDT) Subject: Re: [PATCH v3 2/4] soc: mediatek: pwrap: add arbiter capability To: Hsin-Hsiung Wang , Rob Herring , Argus Lin , drinkcat@chromium.org References: <1600686235-27979-1-git-send-email-hsin-hsiung.wang@mediatek.com> <1600686235-27979-3-git-send-email-hsin-hsiung.wang@mediatek.com> From: Matthias Brugger Message-ID: <46c0e204-b5e2-4ee3-678b-e09844442aad@gmail.com> Date: Mon, 21 Sep 2020 18:48:39 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.12.0 MIME-Version: 1.0 In-Reply-To: <1600686235-27979-3-git-send-email-hsin-hsiung.wang@mediatek.com> Content-Language: en-US X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200921_124841_727220_BFF07874 X-CRM114-Status: GOOD ( 27.74 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: devicetree@vger.kernel.org, srv_heupstream@mediatek.com, linux-mediatek@lists.infradead.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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 > --- > 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 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel