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

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Date:   Sun, 16 Feb 2020 11:53:16 -0300
From:   Paul Cercueil <paul@...pouillou.net>
To:     周琰杰 "(Zhou Yanjie)" 
        <zhouyanjie@...yeetech.com>
Cc:     linux-mips@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        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: Re: [PATCH v5 1/7] clk: JZ4780: Add function for enable the second
 core.

Hi Zhou,

Le dim., févr. 16, 2020 at 02:55, 周琰杰 (Zhou Yanjie) 
<zhouyanjie@...yeetech.com> a écrit :
> 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);
> +	}

You can use readl_poll_timeout() from <linux/iopoll.h>.

> +
> +	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
>