linux-kernel - [PATCH v5 1/7] clk: JZ4780: Add function for enable the second core.

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Message-Id: <1581792932-108032-3-git-send-email-zhouyanjie@wanyeetech.com>
Date:   Sun, 16 Feb 2020 02:55:26 +0800
From:   周琰杰 (Zhou Yanjie) 
        <zhouyanjie@...yeetech.com>
To:     linux-mips@...r.kernel.org
Cc:     linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, paul@...pouillou.net,
        mturquette@...libre.com, sboyd@...nel.org, robh+dt@...nel.org,
        mark.rutland@....com, ralf@...ux-mips.org, paulburton@...nel.org,
        jiaxun.yang@...goat.com, chenhc@...ote.com, allison@...utok.net,
        tglx@...utronix.de, daniel.lezcano@...aro.org,
        geert+renesas@...der.be, krzk@...nel.org, keescook@...omium.org,
        ebiederm@...ssion.com, miquel.raynal@...tlin.com,
        paul@...die.org.uk, hns@...delico.com,
        mips-creator-ci20-dev@...glegroups.com
Subject: [PATCH v5 1/7] clk: JZ4780: Add function for enable the second core.

Add "jz4780_core1_enable()" for enable the second core of JZ4780,
prepare for later commits.

Tested-by: H. Nikolaus Schaller <hns@...delico.com>
Tested-by: Paul Boddie <paul@...die.org.uk>
Signed-off-by: 周琰杰 (Zhou Yanjie) <zhouyanjie@...yeetech.com>
Reviewed-by: Jiaxun Yang <jiaxun.yang@...goat.com>
---

Notes:
    v5:
    New patch, split from [1/6] in v4.

 drivers/clk/ingenic/jz4780-cgu.c | 58 ++++++++++++++++++++++++++++++++++++----
 1 file changed, 53 insertions(+), 5 deletions(-)

diff --git a/drivers/clk/ingenic/jz4780-cgu.c b/drivers/clk/ingenic/jz4780-cgu.c
index d07fff1..4f81819 100644
--- a/drivers/clk/ingenic/jz4780-cgu.c
+++ b/drivers/clk/ingenic/jz4780-cgu.c
@@ -16,7 +16,7 @@
 
 /* CGU register offsets */
 #define CGU_REG_CLOCKCONTROL	0x00
-#define CGU_REG_PLLCONTROL	0x0c
+#define CGU_REG_LCR			0x04
 #define CGU_REG_APLL		0x10
 #define CGU_REG_MPLL		0x14
 #define CGU_REG_EPLL		0x18
@@ -46,8 +46,8 @@
 #define CGU_REG_CLOCKSTATUS	0xd4
 
 /* bits within the OPCR register */
-#define OPCR_SPENDN0		(1 << 7)
-#define OPCR_SPENDN1		(1 << 6)
+#define OPCR_SPENDN0		BIT(7)
+#define OPCR_SPENDN1		BIT(6)
 
 /* bits within the USBPCR register */
 #define USBPCR_USB_MODE		BIT(31)
@@ -88,6 +88,13 @@
 #define USBVBFIL_IDDIGFIL_MASK	(0xffff << USBVBFIL_IDDIGFIL_SHIFT)
 #define USBVBFIL_USBVBFIL_MASK	(0xffff)
 
+/* bits within the LCR register */
+#define LCR_PD_SCPU			BIT(31)
+#define LCR_SCPUS			BIT(27)
+
+/* bits within the CLKGR1 register */
+#define CLKGR1_CORE1		BIT(15)
+
 static struct ingenic_cgu *cgu;
 
 static u8 jz4780_otg_phy_get_parent(struct clk_hw *hw)
@@ -205,6 +212,47 @@ static const struct clk_ops jz4780_otg_phy_ops = {
 	.set_rate = jz4780_otg_phy_set_rate,
 };
 
+static int jz4780_core1_enable(struct clk_hw *hw)
+{
+	struct ingenic_clk *ingenic_clk = to_ingenic_clk(hw);
+	struct ingenic_cgu *cgu = ingenic_clk->cgu;
+	const unsigned int timeout = 100;
+	unsigned long flags;
+	unsigned int i;
+	u32 lcr, clkgr1;
+
+	spin_lock_irqsave(&cgu->lock, flags);
+
+	lcr = readl(cgu->base + CGU_REG_LCR);
+	lcr &= ~LCR_PD_SCPU;
+	writel(lcr, cgu->base + CGU_REG_LCR);
+
+	clkgr1 = readl(cgu->base + CGU_REG_CLKGR1);
+	clkgr1 &= ~CLKGR1_CORE1;
+	writel(clkgr1, cgu->base + CGU_REG_CLKGR1);
+
+	spin_unlock_irqrestore(&cgu->lock, flags);
+
+	/* wait for the CPU to be powered up */
+	for (i = 0; i < timeout; i++) {
+		lcr = readl(cgu->base + CGU_REG_LCR);
+		if (!(lcr & LCR_SCPUS))
+			break;
+		mdelay(1);
+	}
+
+	if (i == timeout) {
+		pr_err("%s: Wait for power up core1 timeout\n", __func__);
+		return -EBUSY;
+	}
+
+	return 0;
+}
+
+static const struct clk_ops jz4780_core1_ops = {
+	.enable = jz4780_core1_enable,
+};
+
 static const s8 pll_od_encoding[16] = {
 	0x0, 0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7,
 	0x8, 0x9, 0xa, 0xb, 0xc, 0xd, 0xe, 0xf,
@@ -701,9 +749,9 @@ static const struct ingenic_cgu_clk_info jz4780_cgu_clocks[] = {
 	},
 
 	[JZ4780_CLK_CORE1] = {
-		"core1", CGU_CLK_GATE,
+		"core1", CGU_CLK_CUSTOM,
 		.parents = { JZ4780_CLK_CPU, -1, -1, -1 },
-		.gate = { CGU_REG_CLKGR1, 15 },
+		.custom = { &jz4780_core1_ops },
 	},
 
 };
-- 
2.7.4