[PATCH v2 4/5] clk: samsung: Add set_rate() clk_ops for PLL36xx

Vikas Sajjan
2013-05-29T13:37:56Z

This patch adds set_rate and round_rate clk_ops for PLL36xx

Signed-off-by: Vikas Sajjan <vikas.sajjan@linaro.org>
---
drivers/clk/samsung/clk-pll.c | 59 +++++++++++++++++++++++++++++++++++++++++
1 file changed, 59 insertions(+)

diff --git a/drivers/clk/samsung/clk-pll.c b/drivers/clk/samsung/clk-pll.c
index 1fba7ef..3872161 100644
--- a/drivers/clk/samsung/clk-pll.c
+++ b/drivers/clk/samsung/clk-pll.c
@@ -210,6 +210,9 @@ struct clk * __init samsung_clk_register_pll35xx(const char *name,
#define PLL36XX_CON0_OFFSET 0x100
#define PLL36XX_CON1_OFFSET 0x104

+/* Maximum lock time can be 3000 * PDIV cycles */
+#define PLL36XX_LOCK_FACTOR 3000
+
#define PLL36XX_KDIV_MASK (0xFFFF)
#define PLL36XX_MDIV_MASK (0x1FF)
#define PLL36XX_PDIV_MASK (0x3F)
@@ -217,6 +220,8 @@ struct clk * __init samsung_clk_register_pll35xx(const char *name,
#define PLL36XX_MDIV_SHIFT (16)
#define PLL36XX_PDIV_SHIFT (8)
#define PLL36XX_SDIV_SHIFT (0)
+#define PLL36XX_KDIV_SHIFT (0)
+#define PLL36XX_LOCK_STAT_SHIFT (29)

static unsigned long samsung_pll36xx_recalc_rate(struct clk_hw *hw,
unsigned long parent_rate)
@@ -239,8 +244,57 @@ static unsigned long samsung_pll36xx_recalc_rate(struct clk_hw *hw,
return (unsigned long)fvco;
}

+static int samsung_pll36xx_set_rate(struct clk_hw *hw, unsigned long drate,
+ unsigned long parent_rate)
+{
+ struct samsung_clk_pll *pll = to_clk_pll(hw);
+ u32 tmp, pll_con0, pll_con1;
+ const struct samsung_pll_rate_table *rate;
+
+ rate = samsung_get_pll_settings(pll, drate);
+ if (!rate) {
+ pr_err("%s: Invalid rate : %lu for pll clk %s\n", __func__,
+ drate, __clk_get_name(hw->clk));
+ return -EINVAL;
+ }
+
+ pll_con0 = pll_readl(pll, PLL36XX_CON0_OFFSET);
+ pll_con1 = pll_readl(pll, PLL36XX_CON1_OFFSET);
+
+ /* Set PLL lock time. */
+ pll_writel(pll, (rate->pdiv * PLL36XX_LOCK_FACTOR),
+ PLL36XX_LOCK_OFFSET);
+
+ /* Change PLL PMS values */
+ pll_con0 &= ~((PLL36XX_MDIV_MASK << PLL36XX_MDIV_SHIFT) |
+ (PLL36XX_PDIV_MASK << PLL36XX_PDIV_SHIFT) |
+ (PLL36XX_SDIV_MASK << PLL36XX_SDIV_SHIFT));
+ pll_con0 |= (rate->mdiv << PLL36XX_MDIV_SHIFT) |
+ (rate->pdiv << PLL36XX_PDIV_SHIFT) |
+ (rate->sdiv << PLL36XX_SDIV_SHIFT);
+ pll_writel(pll, pll_con0, PLL36XX_CON0_OFFSET);
+
+ pll_con1 &= ~(PLL36XX_KDIV_MASK << PLL36XX_KDIV_SHIFT);
+ pll_con1 |= rate->kdiv << PLL36XX_KDIV_SHIFT;
+ pll_writel(pll, pll_con1, PLL36XX_CON1_OFFSET);
+
+ /* wait_lock_time */
+ do {
+ cpu_relax();
+ tmp = pll_readl(pll, PLL36XX_CON0_OFFSET);
+ } while (!(tmp & (1 << PLL36XX_LOCK_STAT_SHIFT)));
+
+ return 0;
+}
+
static const struct clk_ops samsung_pll36xx_clk_ops = {
.recalc_rate = samsung_pll36xx_recalc_rate,
+ .set_rate = samsung_pll36xx_set_rate,
+ .round_rate = samsung_pll_round_rate,
+};
+
+static const struct clk_ops samsung_pll36xx_clk_min_ops = {
+ .recalc_rate = samsung_pll36xx_recalc_rate,
};

struct clk * __init samsung_clk_register_pll36xx(const char *name,
@@ -264,6 +318,11 @@ struct clk * __init samsung_clk_register_pll36xx(const char *name,
init.parent_names = &pname;
init.num_parents = 1;

+ if (rate_table && rate_count)
+ init.ops = &samsung_pll36xx_clk_ops;
+ else
+ init.ops = &samsung_pll36xx_clk_min_ops;
+
pll->hw.init = &init;
pll->base = base;
pll->rate_table = rate_table;
--
1.7.9.5