linux-kernel - [PATCH 03/12] clk: mmp: add init callback for clk-frac

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Tue, 10 Jun 2014 09:27:39 +0800
From:	Chao Xie <chao.xie@...vell.com>
To:	<haojian.zhuang@...il.com>, <mturquette@...aro.org>,
	<chao.xie@...vell.com>, <xiechao_mail@....com>,
	<linux-arm-kernel@...ts.infradead.org>,
	<devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH 03/12] clk: mmp: add init callback for clk-frac

From: Chao Xie <chao.xie@...vell.com>

For the clk-frac, if it has table, we need to make
sure that the initial clock rate is one item of the
table.
If it is not, we use the first item in the table by default.

Signed-off-by: Chao Xie <chao.xie@...vell.com>
---
 drivers/clk/mmp/clk-frac.c | 40 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 40 insertions(+)

diff --git a/drivers/clk/mmp/clk-frac.c b/drivers/clk/mmp/clk-frac.c
index e29d006..1876d2c 100644
--- a/drivers/clk/mmp/clk-frac.c
+++ b/drivers/clk/mmp/clk-frac.c
@@ -118,10 +118,50 @@ static int clk_factor_set_rate(struct clk_hw *hw, unsigned long drate,
 	return 0;
 }
 
+void clk_factor_init(struct clk_hw *hw)
+{
+	struct mmp_clk_factor *factor = to_clk_factor(hw);
+	struct mmp_clk_factor_masks *masks = factor->masks;
+	u32 val, num, den;
+	int i;
+	unsigned long flags = 0;
+
+	if (factor->lock)
+		spin_lock_irqsave(factor->lock, flags);
+
+	val = readl(factor->base);
+
+	/* calculate numerator */
+	num = (val >> masks->num_shift) & masks->num_mask;
+
+	/* calculate denominator */
+	den = (val >> masks->den_shift) & masks->den_mask;
+
+	for (i = 0; i < factor->ftbl_cnt; i++)
+		if (den == factor->ftbl[i].den && num == factor->ftbl[i].num)
+			break;
+
+	if (i >= factor->ftbl_cnt) {
+		val &= ~(masks->num_mask << masks->num_shift);
+		val |= (factor->ftbl[0].num & masks->num_mask) <<
+			masks->num_shift;
+
+		val &= ~(masks->den_mask << masks->den_shift);
+		val |= (factor->ftbl[0].den & masks->den_mask) <<
+			masks->den_shift;
+
+		writel(val, factor->base);
+	}
+
+	if (factor->lock)
+		spin_unlock_irqrestore(factor->lock, flags);
+}
+
 static struct clk_ops clk_factor_ops = {
 	.recalc_rate = clk_factor_recalc_rate,
 	.round_rate = clk_factor_round_rate,
 	.set_rate = clk_factor_set_rate,
+	.init = clk_factor_init,
 };
 
 struct clk *mmp_clk_register_factor(const char *name, const char *parent_name,
-- 
1.8.3.2

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/