[PATCH v4 2/6] clk: qcom: Add LUCID_EVO PLL type for SDX65

quic_vamslank
2021-11-16T07:48:02Z

From: Vamsi Krishna Lanka <quic_vamslank@quicinc.com>

Add a LUCID_EVO PLL type for SDX65 SoC from Qualcomm.

Signed-off-by: Vamsi Krishna Lanka <quic_vamslank@quicinc.com>
---
drivers/clk/qcom/clk-alpha-pll.c | 171 +++++++++++++++++++++++++++++++
drivers/clk/qcom/clk-alpha-pll.h | 3 +
2 files changed, 174 insertions(+)

diff --git a/drivers/clk/qcom/clk-alpha-pll.c b/drivers/clk/qcom/clk-alpha-pll.c
index eaedcceb766f..b2dbb8d56773 100644
--- a/drivers/clk/qcom/clk-alpha-pll.c
+++ b/drivers/clk/qcom/clk-alpha-pll.c
@@ -1,5 +1,6 @@
// SPDX-License-Identifier: GPL-2.0
/*
+ * Copyright (c) 2021, Qualcomm Innovation Center, Inc. All rights reserved.
* Copyright (c) 2015, 2018, The Linux Foundation. All rights reserved.
*/

@@ -139,6 +140,20 @@ const u8 clk_alpha_pll_regs[][PLL_OFF_MAX_REGS] = {
[PLL_OFF_OPMODE] = 0x28,
[PLL_OFF_STATUS] = 0x38,
},
+ [CLK_ALPHA_PLL_TYPE_LUCID_EVO] = {
+ [PLL_OFF_OPMODE] = 0x04,
+ [PLL_OFF_STATUS] = 0x0c,
+ [PLL_OFF_L_VAL] = 0x10,
+ [PLL_OFF_ALPHA_VAL] = 0x14,
+ [PLL_OFF_USER_CTL] = 0x18,
+ [PLL_OFF_USER_CTL_U] = 0x1c,
+ [PLL_OFF_CONFIG_CTL] = 0x20,
+ [PLL_OFF_CONFIG_CTL_U] = 0x24,
+ [PLL_OFF_CONFIG_CTL_U1] = 0x28,
+ [PLL_OFF_TEST_CTL] = 0x2c,
+ [PLL_OFF_TEST_CTL_U] = 0x30,
+ [PLL_OFF_TEST_CTL_U1] = 0x34,
+ },
};
EXPORT_SYMBOL_GPL(clk_alpha_pll_regs);

@@ -175,6 +190,10 @@ EXPORT_SYMBOL_GPL(clk_alpha_pll_regs);
#define LUCID_5LPE_PLL_LATCH_INPUT BIT(14)
#define LUCID_5LPE_ENABLE_VOTE_RUN BIT(21)

+/* LUCID EVO PLL specific settings and offsets */
+#define LUCID_EVO_ENABLE_VOTE_RUN BIT(25)
+#define LUCID_EVO_PLL_L_VAL_MASK GENMASK(15, 0)
+
/* ZONDA PLL specific */
#define ZONDA_PLL_OUT_MASK 0xf
#define ZONDA_STAY_IN_CFA BIT(16)
@@ -1951,3 +1970,155 @@ const struct clk_ops clk_alpha_pll_zonda_ops = {
.set_rate = clk_zonda_pll_set_rate,
};
EXPORT_SYMBOL(clk_alpha_pll_zonda_ops);
+
+static int alpha_pll_lucid_evo_enable(struct clk_hw *hw)
+{
+ struct clk_alpha_pll *pll = to_clk_alpha_pll(hw);
+ struct regmap *regmap = pll->clkr.regmap;
+ u32 val;
+ int ret;
+
+ ret = regmap_read(regmap, PLL_USER_CTL(pll), &val);
+ if (ret)
+ return ret;
+
+ /* If in FSM mode, just vote for it */
+ if (val & LUCID_EVO_ENABLE_VOTE_RUN) {
+ ret = clk_enable_regmap(hw);
+ if (ret)
+ return ret;
+ return wait_for_pll_enable_lock(pll);
+ }
+
+ /* Check if PLL is already enabled */
+ ret = trion_pll_is_enabled(pll, regmap);
+ if (ret < 0)
+ return ret;
+ else if (ret) {
+ pr_warn("%s PLL is already enabled\n",
+ clk_hw_get_name(&pll->clkr.hw));
+ return 0;
+ }
+
+ ret = regmap_update_bits(regmap, PLL_MODE(pll), PLL_RESET_N, PLL_RESET_N);
+ if (ret)
+ return ret;
+
+ /* Set operation mode to RUN */
+ regmap_write(regmap, PLL_OPMODE(pll), PLL_RUN);
+
+ ret = wait_for_pll_enable_lock(pll);
+ if (ret)
+ return ret;
+
+ /* Enable the PLL outputs */
+ ret = regmap_update_bits(regmap, PLL_USER_CTL(pll), PLL_OUT_MASK, PLL_OUT_MASK);
+ if (ret)
+ return ret;
+
+ /* Enable the global PLL outputs */
+ ret = regmap_update_bits(regmap, PLL_MODE(pll), PLL_OUTCTRL, PLL_OUTCTRL);
+ if (ret)
+ return ret;
+
+ /* Ensure that the write above goes through before returning. */
+ mb();
+ return ret;
+}
+
+static void alpha_pll_lucid_evo_disable(struct clk_hw *hw)
+{
+ struct clk_alpha_pll *pll = to_clk_alpha_pll(hw);
+ struct regmap *regmap = pll->clkr.regmap;
+ u32 val;
+ int ret;
+
+ ret = regmap_read(regmap, PLL_USER_CTL(pll), &val);
+ if (ret)
+ return;
+
+ /* If in FSM mode, just unvote it */
+ if (val & LUCID_EVO_ENABLE_VOTE_RUN) {
+ clk_disable_regmap(hw);
+ return;
+ }
+
+ /* Disable the global PLL output */
+ ret = regmap_update_bits(regmap, PLL_MODE(pll), PLL_OUTCTRL, 0);
+ if (ret)
+ return;
+
+ /* Disable the PLL outputs */
+ ret = regmap_update_bits(regmap, PLL_USER_CTL(pll), PLL_OUT_MASK, 0);
+ if (ret)
+ return;
+
+ /* Place the PLL mode in STANDBY */
+ regmap_write(regmap, PLL_OPMODE(pll), PLL_STANDBY);
+}
+
+static unsigned long alpha_pll_lucid_evo_recalc_rate(struct clk_hw *hw,
+ unsigned long parent_rate)
+{
+ struct clk_alpha_pll *pll = to_clk_alpha_pll(hw);
+ struct regmap *regmap = pll->clkr.regmap;
+ u32 l, frac;
+
+ regmap_read(regmap, PLL_L_VAL(pll), &l);
+ l &= LUCID_EVO_PLL_L_VAL_MASK;
+ regmap_read(regmap, PLL_ALPHA_VAL(pll), &frac);
+
+ return alpha_pll_calc_rate(parent_rate, l, frac, pll_alpha_width(pll));
+}
+
+static int clk_lucid_evo_pll_postdiv_set_rate(struct clk_hw *hw,
+ unsigned long rate, unsigned long parent_rate)
+{
+ struct clk_alpha_pll_postdiv *pll = to_clk_alpha_pll_postdiv(hw);
+ struct regmap *regmap = pll->clkr.regmap;
+ int i, val, div, ret;
+
+ /*
+ * If the PLL is in FSM mode, then treat set_rate callback as a
+ * no-operation.
+ */
+ ret = regmap_read(regmap, PLL_USER_CTL(pll), &val);
+ if (ret)
+ return ret;
+
+ if (val & LUCID_EVO_ENABLE_VOTE_RUN)
+ return 0;
+
+ if (!pll->post_div_table) {
+ pr_err("Missing the post_div_table for the PLL\n");
+ return -EINVAL;
+ }
+
+ div = DIV_ROUND_UP_ULL((u64)parent_rate, rate);
+ for (i = 0; i < pll->num_post_div; i++) {
+ if (pll->post_div_table[i].div == div) {
+ val = pll->post_div_table[i].val;
+ break;
+ }
+ }
+
+ return regmap_update_bits(regmap, PLL_USER_CTL(pll),
+ (BIT(pll->width) - 1) << pll->post_div_shift,
+ val << pll->post_div_shift);
+}
+
+const struct clk_ops clk_alpha_pll_fixed_lucid_evo_ops = {
+ .enable = alpha_pll_lucid_evo_enable,
+ .disable = alpha_pll_lucid_evo_disable,
+ .is_enabled = clk_trion_pll_is_enabled,
+ .recalc_rate = alpha_pll_lucid_evo_recalc_rate,
+ .round_rate = clk_alpha_pll_round_rate,
+};
+EXPORT_SYMBOL_GPL(clk_alpha_pll_fixed_lucid_evo_ops);
+
+const struct clk_ops clk_alpha_pll_postdiv_lucid_evo_ops = {
+ .recalc_rate = clk_alpha_pll_postdiv_fabia_recalc_rate,
+ .round_rate = clk_alpha_pll_postdiv_fabia_round_rate,
+ .set_rate = clk_lucid_evo_pll_postdiv_set_rate,
+};
+EXPORT_SYMBOL_GPL(clk_alpha_pll_postdiv_lucid_evo_ops);
diff --git a/drivers/clk/qcom/clk-alpha-pll.h b/drivers/clk/qcom/clk-alpha-pll.h
index 55e4fa47912f..6e9907deaf30 100644
--- a/drivers/clk/qcom/clk-alpha-pll.h
+++ b/drivers/clk/qcom/clk-alpha-pll.h
@@ -17,6 +17,7 @@ enum {
CLK_ALPHA_PLL_TYPE_LUCID = CLK_ALPHA_PLL_TYPE_TRION,
CLK_ALPHA_PLL_TYPE_AGERA,
CLK_ALPHA_PLL_TYPE_ZONDA,
+ CLK_ALPHA_PLL_TYPE_LUCID_EVO,
CLK_ALPHA_PLL_TYPE_MAX,
};

@@ -151,6 +152,8 @@ extern const struct clk_ops clk_alpha_pll_postdiv_lucid_5lpe_ops;

extern const struct clk_ops clk_alpha_pll_zonda_ops;
#define clk_alpha_pll_postdiv_zonda_ops clk_alpha_pll_postdiv_fabia_ops
+extern const struct clk_ops clk_alpha_pll_fixed_lucid_evo_ops;
+extern const struct clk_ops clk_alpha_pll_postdiv_lucid_evo_ops;

void clk_alpha_pll_configure(struct clk_alpha_pll *pll, struct regmap *regmap,
const struct alpha_pll_config *config);
--
2.33.1