From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mail-pg0-x244.google.com ([2607:f8b0:400e:c05::244]) by bombadil.infradead.org with esmtps (Exim 4.85_2 #1 (Red Hat Linux)) id 1cDug0-0005TM-GN for barebox@lists.infradead.org; Mon, 05 Dec 2016 14:55:35 +0000 Received: by mail-pg0-x244.google.com with SMTP id 3so16684737pgd.0 for ; Mon, 05 Dec 2016 06:55:12 -0800 (PST) From: Andrey Smirnov Date: Mon, 5 Dec 2016 06:54:33 -0800 Message-Id: <1480949684-18520-6-git-send-email-andrew.smirnov@gmail.com> In-Reply-To: <1480949684-18520-1-git-send-email-andrew.smirnov@gmail.com> References: <1480949684-18520-1-git-send-email-andrew.smirnov@gmail.com> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "barebox" Errors-To: barebox-bounces+u.kleine-koenig=pengutronix.de@lists.infradead.org Subject: [PATCH 05/16] i.MX: clk: Add IMX_PLLV3_SYS_VF610 subtype To: barebox@lists.infradead.org Cc: Andrey Smirnov Add IMX_PLLV3_SYS_VF610 subtype to pllv3 code to be able to control and re-clock PLL1 and PLL2 on Vybrid SoC. This commit also introduces imx_clk_pllv3_locked which allows the user to create PLLv3 and specify how it should be polled for "locked" status (used in .set_rate callback) Signed-off-by: Andrey Smirnov --- drivers/clk/imx/clk-pllv3.c | 108 ++++++++++++++++++++++++++++++++++++++++++++ drivers/clk/imx/clk.h | 5 ++ 2 files changed, 113 insertions(+) diff --git a/drivers/clk/imx/clk-pllv3.c b/drivers/clk/imx/clk-pllv3.c index 29c0f1c..dd924a4 100644 --- a/drivers/clk/imx/clk-pllv3.c +++ b/drivers/clk/imx/clk-pllv3.c @@ -26,6 +26,8 @@ #define PLL_NUM_OFFSET 0x10 #define PLL_DENOM_OFFSET 0x20 +#define SYS_VF610_PLL_OFFSET 0x10 + #define BM_PLL_POWER (0x1 << 12) #define BM_PLL_ENABLE (0x1 << 13) #define BM_PLL_BYPASS (0x1 << 16) @@ -38,6 +40,8 @@ struct clk_pllv3 { u32 div_mask; u32 div_shift; const char *parent; + void __iomem *lock_reg; + u32 lock_mask; }; #define to_clk_pllv3(_clk) container_of(_clk, struct clk_pllv3, clk) @@ -279,6 +283,88 @@ static const struct clk_ops clk_pllv3_mlb_ops = { .disable = clk_pllv3_disable, }; +static unsigned long clk_pllv3_sys_vf610_recalc_rate(struct clk *clk, + unsigned long parent_rate) +{ + struct clk_pllv3 *pll = to_clk_pllv3(clk); + + u32 mfn = readl(pll->base + SYS_VF610_PLL_OFFSET + PLL_NUM_OFFSET); + u32 mfd = readl(pll->base + SYS_VF610_PLL_OFFSET + PLL_DENOM_OFFSET); + u32 div = (readl(pll->base) & pll->div_mask) ? 22 : 20; + + return (parent_rate * div) + ((parent_rate / mfd) * mfn); +} + +static long clk_pllv3_sys_vf610_round_rate(struct clk *clk, unsigned long rate, + unsigned long *prate) +{ + unsigned long parent_rate = *prate; + unsigned long min_rate = parent_rate * 20; + unsigned long max_rate = 528000000; + u32 mfn, mfd = 1000000; + u64 temp64; + + if (rate >= max_rate) + return max_rate; + else if (rate < min_rate) + rate = min_rate; + + temp64 = (u64) (rate - 20 * parent_rate); + temp64 *= mfd; + do_div(temp64, parent_rate); + mfn = temp64; + + return parent_rate * 20 + parent_rate / mfd * mfn; +} + +static int clk_pllv3_sys_vf610_set_rate(struct clk *clk, unsigned long rate, + unsigned long parent_rate) +{ + struct clk_pllv3 *pll = to_clk_pllv3(clk); + unsigned long min_rate = parent_rate * 20; + unsigned long max_rate = 528000000; + u32 val; + u32 mfn, mfd = 1000000; + u64 temp64; + + if (rate < min_rate || rate > max_rate) + return -EINVAL; + + val = readl(pll->base); + + if (rate == max_rate) { + writel(0, pll->base + SYS_VF610_PLL_OFFSET + PLL_NUM_OFFSET); + val |= pll->div_mask; + writel(val, pll->base); + + return 0; + } else { + val &= ~pll->div_mask; + } + + temp64 = (u64) (rate - 20 * parent_rate); + temp64 *= mfd; + do_div(temp64, parent_rate); + mfn = temp64; + + writel(val, pll->base); + writel(mfn, pll->base + SYS_VF610_PLL_OFFSET + PLL_NUM_OFFSET); + writel(mfd, pll->base + SYS_VF610_PLL_OFFSET + PLL_DENOM_OFFSET); + + while (!(readl(pll->lock_reg) & pll->lock_mask)) + ; + + return 0; +} + +static const struct clk_ops clk_pllv3_sys_vf610_ops = { + .enable = clk_pllv3_enable, + .disable = clk_pllv3_disable, + .recalc_rate = clk_pllv3_sys_vf610_recalc_rate, + .round_rate = clk_pllv3_sys_vf610_round_rate, + .set_rate = clk_pllv3_sys_vf610_set_rate, +}; + struct clk *imx_clk_pllv3(enum imx_pllv3_type type, const char *name, const char *parent, void __iomem *base, u32 div_mask) @@ -290,6 +376,9 @@ struct clk *imx_clk_pllv3(enum imx_pllv3_type type, const char *name, pll = xzalloc(sizeof(*pll)); switch (type) { + case IMX_PLLV3_SYS_VF610: + ops = &clk_pllv3_sys_vf610_ops; + break; case IMX_PLLV3_SYS: ops = &clk_pllv3_sys_ops; break; @@ -327,3 +416,22 @@ struct clk *imx_clk_pllv3(enum imx_pllv3_type type, const char *name, return &pll->clk; } + +struct clk *imx_clk_pllv3_locked(enum imx_pllv3_type type, const char *name, + const char *parent, void __iomem *base, + u32 div_mask, void __iomem *lock_reg, u32 lock_mask) +{ + struct clk *clk; + struct clk_pllv3 *pll; + + clk = imx_clk_pllv3(type, name, parent, base, div_mask); + if (IS_ERR(clk)) + return clk; + + pll = to_clk_pllv3(clk); + + pll->lock_reg = lock_reg; + pll->lock_mask = lock_mask; + + return clk; +} diff --git a/drivers/clk/imx/clk.h b/drivers/clk/imx/clk.h index 970f65c..0b28fb2 100644 --- a/drivers/clk/imx/clk.h +++ b/drivers/clk/imx/clk.h @@ -78,6 +78,7 @@ struct clk *imx_clk_pllv2(const char *name, const char *parent, enum imx_pllv3_type { IMX_PLLV3_GENERIC, IMX_PLLV3_SYS, + IMX_PLLV3_SYS_VF610, IMX_PLLV3_USB, IMX_PLLV3_USB_VF610, IMX_PLLV3_AV, @@ -89,6 +90,10 @@ struct clk *imx_clk_pllv3(enum imx_pllv3_type type, const char *name, const char *parent, void __iomem *base, u32 div_mask); +struct clk *imx_clk_pllv3_locked(enum imx_pllv3_type type, const char *name, + const char *parent, void __iomem *base, + u32 div_mask, void __iomem *lock_reg, u32 lock_mask); + struct clk *imx_clk_pfd(const char *name, const char *parent, void __iomem *reg, u8 idx); -- 2.5.5 _______________________________________________ barebox mailing list barebox@lists.infradead.org http://lists.infradead.org/mailman/listinfo/barebox