soc: mediatek: pwrap: add arbiter capability

Add arbiter capability for pwrap driver.
The arbiter capability uses new design to judge the priority and latency
for multi-channel.
The design with arbiter support cannot change the watchdog timer.
This patch is preparing for adding mt6873/8192 pwrap support.
Signed-off-by: Hsin-Hsiung Wang <hsin-hsiung.wang@mediatek.com>
Link: https://lore.kernel.org/r/1615563286-22126-3-git-send-email-hsin-hsiung.wang@mediatek.comSigned-off-by: Matthias Brugger <matthias.bgg@gmail.com>

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,
@@ -1106,18 +1111,25 @@ static void pwrap_writel(struct pmic_wrapper *wrp, u32 val, enum pwrap_regs reg)
 	writel(val, wrp->base + wrp->master->regs[reg]);
 }
 
-static bool pwrap_is_fsm_idle(struct pmic_wrapper *wrp)
+static u32 pwrap_get_fsm_state(struct pmic_wrapper *wrp)
 {
-	u32 val = pwrap_readl(wrp, PWRAP_WACS2_RDATA);
+	u32 val;
 
-	return PWRAP_GET_WACS_FSM(val) == PWRAP_WACS_FSM_IDLE;
+	val = pwrap_readl(wrp, PWRAP_WACS2_RDATA);
+	if (HAS_CAP(wrp->master->caps, PWRAP_CAP_ARB))
+		return PWRAP_GET_WACS_ARB_FSM(val);
+	else
+		return PWRAP_GET_WACS_FSM(val);
 }
 
-static bool pwrap_is_fsm_vldclr(struct pmic_wrapper *wrp)
+static bool pwrap_is_fsm_idle(struct pmic_wrapper *wrp)
 {
-	u32 val = pwrap_readl(wrp, PWRAP_WACS2_RDATA);
+	return pwrap_get_fsm_state(wrp) == PWRAP_WACS_FSM_IDLE;
+}
 
-	return PWRAP_GET_WACS_FSM(val) == PWRAP_WACS_FSM_WFVLDCLR;
+static bool pwrap_is_fsm_vldclr(struct pmic_wrapper *wrp)
+{
+	return pwrap_get_fsm_state(wrp) == PWRAP_WACS_FSM_WFVLDCLR;
 }
 
 /*
@@ -1165,6 +1177,7 @@ 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 +1185,21 @@ 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 +1249,13 @@ 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)) {
+		pwrap_writel(wrp, wdata, PWRAP_SWINF_2_WDATA_31_0);
+		pwrap_writel(wrp, BIT(29) | adr, PWRAP_WACS2_CMD);
+	} else {
+		pwrap_writel(wrp, BIT(31) | ((adr >> 1) << 16) | wdata,
+			     PWRAP_WACS2_CMD);
+	}
 
 	return 0;
 }
@@ -2022,6 +2048,7 @@ 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 +2143,21 @@ 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);
+
 	/*
 	 * Since STAUPD was not used on mt8173 platform,
 	 * so STAUPD of WDT_SRC which should be turned off
@@ -2132,7 +2166,11 @@ static int pwrap_probe(struct platform_device *pdev)
 	if (HAS_CAP(wrp->master->caps, PWRAP_CAP_WDT_SRC1))
 		pwrap_writel(wrp, wrp->master->wdt_src, PWRAP_WDT_SRC_EN_1);
 
-	pwrap_writel(wrp, 0x1, PWRAP_TIMER_EN);
+	if (HAS_CAP(wrp->master->caps, PWRAP_CAP_ARB))
+		pwrap_writel(wrp, 0x3, PWRAP_TIMER_EN);
+	else
+		pwrap_writel(wrp, 0x1, PWRAP_TIMER_EN);
+
 	pwrap_writel(wrp, wrp->master->int_en_all, PWRAP_INT_EN);
 	/*
 	 * We add INT1 interrupt to handle starvation and request exception