clk: qcom: Add support for SR2 PLLs

Add support for SR2 type pll operations. SR2 is optimized for Time Interval
Error (TIE) or absolute jitter.

Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

diff --git a/drivers/clk/qcom/clk-pll.c b/drivers/clk/qcom/clk-pll.c
index 245d506..017eede 100644 (file)
--- a/drivers/clk/qcom/clk-pll.c
+++ b/drivers/clk/qcom/clk-pll.c
@@ -292,3 +292,78 @@ void clk_pll_configure_sr_hpm_lp(struct clk_pll *pll, struct regmap *regmap,
                clk_pll_set_fsm_mode(pll, regmap, 0);
 }
 EXPORT_SYMBOL_GPL(clk_pll_configure_sr_hpm_lp);
+
+static int clk_pll_sr2_enable(struct clk_hw *hw)
+{
+       struct clk_pll *pll = to_clk_pll(hw);
+       int ret;
+       u32 mode;
+
+       ret = regmap_read(pll->clkr.regmap, pll->mode_reg, &mode);
+       if (ret)
+               return ret;
+
+       /* Disable PLL bypass mode. */
+       ret = regmap_update_bits(pll->clkr.regmap, pll->mode_reg, PLL_BYPASSNL,
+                                PLL_BYPASSNL);
+       if (ret)
+               return ret;
+
+       /*
+        * H/W requires a 5us delay between disabling the bypass and
+        * de-asserting the reset. Delay 10us just to be safe.
+        */
+       udelay(10);
+
+       /* De-assert active-low PLL reset. */
+       ret = regmap_update_bits(pll->clkr.regmap, pll->mode_reg, PLL_RESET_N,
+                                PLL_RESET_N);
+       if (ret)
+               return ret;
+
+       ret = wait_for_pll(pll);
+       if (ret)
+               return ret;
+
+       /* Enable PLL output. */
+       return regmap_update_bits(pll->clkr.regmap, pll->mode_reg, PLL_OUTCTRL,
+                                PLL_OUTCTRL);
+}
+
+static int
+clk_pll_sr2_set_rate(struct clk_hw *hw, unsigned long rate, unsigned long prate)
+{
+       struct clk_pll *pll = to_clk_pll(hw);
+       const struct pll_freq_tbl *f;
+       bool enabled;
+       u32 mode;
+       u32 enable_mask = PLL_OUTCTRL | PLL_BYPASSNL | PLL_RESET_N;
+
+       f = find_freq(pll->freq_tbl, rate);
+       if (!f)
+               return -EINVAL;
+
+       regmap_read(pll->clkr.regmap, pll->mode_reg, &mode);
+       enabled = (mode & enable_mask) == enable_mask;
+
+       if (enabled)
+               clk_pll_disable(hw);
+
+       regmap_update_bits(pll->clkr.regmap, pll->l_reg, 0x3ff, f->l);
+       regmap_update_bits(pll->clkr.regmap, pll->m_reg, 0x7ffff, f->m);
+       regmap_update_bits(pll->clkr.regmap, pll->n_reg, 0x7ffff, f->n);
+
+       if (enabled)
+               clk_pll_sr2_enable(hw);
+
+       return 0;
+}
+
+const struct clk_ops clk_pll_sr2_ops = {
+       .enable = clk_pll_sr2_enable,
+       .disable = clk_pll_disable,
+       .set_rate = clk_pll_sr2_set_rate,
+       .recalc_rate = clk_pll_recalc_rate,
+       .determine_rate = clk_pll_determine_rate,
+};
+EXPORT_SYMBOL_GPL(clk_pll_sr2_ops);

diff --git a/drivers/clk/qcom/clk-pll.h b/drivers/clk/qcom/clk-pll.h
index c9c0cda..ffd0c63 100644 (file)
--- a/drivers/clk/qcom/clk-pll.h
+++ b/drivers/clk/qcom/clk-pll.h
@@ -62,6 +62,7 @@ struct clk_pll {
 
 extern const struct clk_ops clk_pll_ops;
 extern const struct clk_ops clk_pll_vote_ops;
+extern const struct clk_ops clk_pll_sr2_ops;
 
 #define to_clk_pll(_hw) container_of(to_clk_regmap(_hw), struct clk_pll, clkr)