From: Vikas Sajjan <vikas.saj...@linaro.org>
This patch adds set_rate and round_rate clk_ops for PLL36xx
Reviewed-by: Tomasz Figa <t.f...@samsung.com>
Reviewed-by: Doug Anderson <diand...@chromium.org>
Signed-off-by: Vikas Sajjan <vikas.saj...@linaro.org>
---
drivers/clk/samsung/clk-pll.c | 79 ++++++++++++++++++++++++++++++++++++++++-
1 files changed, 78 insertions(+), 1 deletions(-)
diff --git a/drivers/clk/samsung/clk-pll.c b/drivers/clk/samsung/clk-pll.c
index b5c8b15..66cb1cb 100644
--- a/drivers/clk/samsung/clk-pll.c
+++ b/drivers/clk/samsung/clk-pll.c
@@ -160,6 +160,8 @@ static const struct clk_ops samsung_pll35xx_clk_min_ops = {
/*
* PLL36xx Clock Type
*/
+/* Maximum lock time can be 3000 * PDIV cycles */
+#define PLL36XX_LOCK_FACTOR (3000)
#define PLL36XX_KDIV_MASK (0xFFFF)
#define PLL36XX_MDIV_MASK (0x1FF)
@@ -168,6 +170,8 @@ static const struct clk_ops samsung_pll35xx_clk_min_ops = {
#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)
@@ -190,8 +194,78 @@ static unsigned long samsung_pll36xx_recalc_rate(struct
clk_hw *hw,
return (unsigned long)fvco;
}
+static inline bool samsung_pll36xx_mpk_change(
+ const struct samsung_pll_rate_table *rate, u32 pll_con0, u32 pll_con1)
+{
+ u32 old_mdiv, old_pdiv, old_kdiv;
+
+ old_mdiv = (pll_con0 >> PLL36XX_MDIV_SHIFT) & PLL36XX_MDIV_MASK;
+ old_pdiv = (pll_con0 >> PLL36XX_PDIV_SHIFT) & PLL36XX_PDIV_MASK;
+ old_kdiv = (pll_con1 >> PLL36XX_KDIV_SHIFT) & PLL36XX_KDIV_MASK;
+
+ return (rate->mdiv != old_mdiv || rate->pdiv != old_pdiv ||
+ rate->kdiv != old_kdiv);
+}
+
+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 = __raw_readl(pll->con_reg);
+ pll_con1 = __raw_readl(pll->con_reg + 4);
+
+ if (!(samsung_pll36xx_mpk_change(rate, pll_con0, pll_con1))) {
+ /* If only s change, change just s value only*/
+ pll_con0 &= ~(PLL36XX_SDIV_MASK << PLL36XX_SDIV_SHIFT);
+ pll_con0 |= (rate->sdiv << PLL36XX_SDIV_SHIFT);
+ __raw_writel(pll_con0, pll->con_reg);
+
+ return 0;
+ }
+
+ /* Set PLL lock time. */
+ __raw_writel(rate->pdiv * PLL36XX_LOCK_FACTOR, pll->lock_reg);
+
+ /* 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);
+ __raw_writel(pll_con0, pll->con_reg);
+
+ pll_con1 &= ~(PLL36XX_KDIV_MASK << PLL36XX_KDIV_SHIFT);
+ pll_con1 |= rate->kdiv << PLL36XX_KDIV_SHIFT;
+ __raw_writel(pll_con1, pll->con_reg + 4);
+
+ /* wait_lock_time */
+ do {
+ cpu_relax();
+ tmp = __raw_readl(pll->con_reg);
+ } 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,
};
/*
@@ -492,7 +566,10 @@ static void __init _samsung_clk_register_pll(struct
samsung_pll_clock *pll_clk,
/* clk_ops for 36xx and 2650 are similar */
case pll_36xx:
case pll_2650:
- init.ops = &samsung_pll36xx_clk_ops;
+ if (!pll->rate_table)
+ init.ops = &samsung_pll36xx_clk_min_ops;
+ else
+ init.ops = &samsung_pll36xx_clk_ops;
break;
default:
pr_warn("%s: Unknown pll type for pll clk %s\n",
--
1.7.0.4
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