clk: qcom: clk-alpha-pll: Add support for Stromer PLLs

Add programming sequence support for managing the Stromer
PLLs.

Reviewed-by: Stephen Boyd <sboyd@kernel.org>
Co-developed-by: Sricharan R <quic_srichara@quicinc.com>
Signed-off-by: Sricharan R <quic_srichara@quicinc.com>
Signed-off-by: Varadarajan Narayanan <quic_varada@quicinc.com>
Signed-off-by: Kathiravan T <quic_kathirav@quicinc.com>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230307062232.4889-2-quic_kathirav@quicinc.com

diff --git a/drivers/clk/qcom/clk-alpha-pll.c b/drivers/clk/qcom/clk-alpha-pll.c
index e266379..14f9436 100644 (file)
--- a/drivers/clk/qcom/clk-alpha-pll.c
+++ b/drivers/clk/qcom/clk-alpha-pll.c
@@ -1,7 +1,7 @@
 // SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright (c) 2015, 2018, The Linux Foundation. All rights reserved.
- * Copyright (c) 2021, Qualcomm Innovation Center, Inc. All rights reserved.
+ * Copyright (c) 2021, 2023, Qualcomm Innovation Center, Inc. All rights reserved.
  */
 
 #include <linux/kernel.h>
@@ -204,6 +204,18 @@ const u8 clk_alpha_pll_regs[][PLL_OFF_MAX_REGS] = {
                [PLL_OFF_CONFIG_CTL] = 0x1C,
                [PLL_OFF_STATUS] = 0x20,
        },
+       [CLK_ALPHA_PLL_TYPE_STROMER] = {
+               [PLL_OFF_L_VAL] = 0x08,
+               [PLL_OFF_ALPHA_VAL] = 0x10,
+               [PLL_OFF_ALPHA_VAL_U] = 0x14,
+               [PLL_OFF_USER_CTL] = 0x18,
+               [PLL_OFF_USER_CTL_U] = 0x1c,
+               [PLL_OFF_CONFIG_CTL] = 0x20,
+               [PLL_OFF_CONFIG_CTL_U] = 0xff,
+               [PLL_OFF_TEST_CTL] = 0x30,
+               [PLL_OFF_TEST_CTL_U] = 0x34,
+               [PLL_OFF_STATUS] = 0x28,
+       },
 };
 EXPORT_SYMBOL_GPL(clk_alpha_pll_regs);
 
@@ -215,6 +227,8 @@ EXPORT_SYMBOL_GPL(clk_alpha_pll_regs);
 #define ALPHA_BITWIDTH         32U
 #define ALPHA_SHIFT(w)         min(w, ALPHA_BITWIDTH)
 
+#define        ALPHA_PLL_STATUS_REG_SHIFT      8
+
 #define PLL_HUAYRA_M_WIDTH             8
 #define PLL_HUAYRA_M_SHIFT             8
 #define PLL_HUAYRA_M_MASK              0xff
@@ -2329,3 +2343,115 @@ const struct clk_ops clk_alpha_pll_rivian_evo_ops = {
        .round_rate = clk_rivian_evo_pll_round_rate,
 };
 EXPORT_SYMBOL_GPL(clk_alpha_pll_rivian_evo_ops);
+
+void clk_stromer_pll_configure(struct clk_alpha_pll *pll, struct regmap *regmap,
+                              const struct alpha_pll_config *config)
+{
+       u32 val, val_u, mask, mask_u;
+
+       regmap_write(regmap, PLL_L_VAL(pll), config->l);
+       regmap_write(regmap, PLL_ALPHA_VAL(pll), config->alpha);
+       regmap_write(regmap, PLL_CONFIG_CTL(pll), config->config_ctl_val);
+
+       if (pll_has_64bit_config(pll))
+               regmap_write(regmap, PLL_CONFIG_CTL_U(pll),
+                            config->config_ctl_hi_val);
+
+       if (pll_alpha_width(pll) > 32)
+               regmap_write(regmap, PLL_ALPHA_VAL_U(pll), config->alpha_hi);
+
+       val = config->main_output_mask;
+       val |= config->aux_output_mask;
+       val |= config->aux2_output_mask;
+       val |= config->early_output_mask;
+       val |= config->pre_div_val;
+       val |= config->post_div_val;
+       val |= config->vco_val;
+       val |= config->alpha_en_mask;
+       val |= config->alpha_mode_mask;
+
+       mask = config->main_output_mask;
+       mask |= config->aux_output_mask;
+       mask |= config->aux2_output_mask;
+       mask |= config->early_output_mask;
+       mask |= config->pre_div_mask;
+       mask |= config->post_div_mask;
+       mask |= config->vco_mask;
+       mask |= config->alpha_en_mask;
+       mask |= config->alpha_mode_mask;
+
+       regmap_update_bits(regmap, PLL_USER_CTL(pll), mask, val);
+
+       /* Stromer APSS PLL does not enable LOCK_DET by default, so enable it */
+       val_u = config->status_val << ALPHA_PLL_STATUS_REG_SHIFT;
+       val_u |= config->lock_det;
+
+       mask_u = config->status_mask;
+       mask_u |= config->lock_det;
+
+       regmap_update_bits(regmap, PLL_USER_CTL_U(pll), mask_u, val_u);
+       regmap_write(regmap, PLL_TEST_CTL(pll), config->test_ctl_val);
+       regmap_write(regmap, PLL_TEST_CTL_U(pll), config->test_ctl_hi_val);
+
+       if (pll->flags & SUPPORTS_FSM_MODE)
+               qcom_pll_set_fsm_mode(regmap, PLL_MODE(pll), 6, 0);
+}
+EXPORT_SYMBOL_GPL(clk_stromer_pll_configure);
+
+static int clk_alpha_pll_stromer_determine_rate(struct clk_hw *hw,
+                                               struct clk_rate_request *req)
+{
+       u32 l;
+       u64 a;
+
+       req->rate = alpha_pll_round_rate(req->rate, req->best_parent_rate,
+                                        &l, &a, ALPHA_REG_BITWIDTH);
+
+       return 0;
+}
+
+static int clk_alpha_pll_stromer_set_rate(struct clk_hw *hw, unsigned long rate,
+                                         unsigned long prate)
+{
+       struct clk_alpha_pll *pll = to_clk_alpha_pll(hw);
+       int ret;
+       u32 l;
+       u64 a;
+
+       rate = alpha_pll_round_rate(rate, prate, &l, &a, ALPHA_REG_BITWIDTH);
+
+       regmap_write(pll->clkr.regmap, PLL_L_VAL(pll), l);
+       regmap_write(pll->clkr.regmap, PLL_ALPHA_VAL(pll), a);
+       regmap_write(pll->clkr.regmap, PLL_ALPHA_VAL_U(pll),
+                    a >> ALPHA_BITWIDTH);
+
+       regmap_update_bits(pll->clkr.regmap, PLL_USER_CTL(pll),
+                          PLL_ALPHA_EN, PLL_ALPHA_EN);
+
+       if (!clk_hw_is_enabled(hw))
+               return 0;
+
+       /*
+        * Stromer PLL supports Dynamic programming.
+        * It allows the PLL frequency to be changed on-the-fly without first
+        * execution of a shutdown procedure followed by a bring up procedure.
+        */
+       regmap_update_bits(pll->clkr.regmap, PLL_MODE(pll), PLL_UPDATE,
+                          PLL_UPDATE);
+
+       ret = wait_for_pll_update(pll);
+       if (ret)
+               return ret;
+
+       return wait_for_pll_enable_lock(pll);
+}
+
+const struct clk_ops clk_alpha_pll_stromer_ops = {
+       .enable = clk_alpha_pll_enable,
+       .disable = clk_alpha_pll_disable,
+       .is_enabled = clk_alpha_pll_is_enabled,
+       .recalc_rate = clk_alpha_pll_recalc_rate,
+       .determine_rate = clk_alpha_pll_stromer_determine_rate,
+       .set_rate = clk_alpha_pll_stromer_set_rate,
+};
+EXPORT_SYMBOL_GPL(clk_alpha_pll_stromer_ops);

diff --git a/drivers/clk/qcom/clk-alpha-pll.h b/drivers/clk/qcom/clk-alpha-pll.h
index c67cfda..ff25c7f 100644 (file)
--- a/drivers/clk/qcom/clk-alpha-pll.h
+++ b/drivers/clk/qcom/clk-alpha-pll.h
@@ -1,5 +1,9 @@
 /* SPDX-License-Identifier: GPL-2.0 */
-/* Copyright (c) 2015, 2018, The Linux Foundation. All rights reserved. */
+/*
+ * Copyright (c) 2015, 2018, 2021 The Linux Foundation. All rights reserved.
+ * Copyright (c) 2023 Qualcomm Innovation Center, Inc. All rights reserved.
+ */
+
 
 #ifndef __QCOM_CLK_ALPHA_PLL_H__
 #define __QCOM_CLK_ALPHA_PLL_H__
@@ -22,6 +26,7 @@ enum {
        CLK_ALPHA_PLL_TYPE_RIVIAN_EVO,
        CLK_ALPHA_PLL_TYPE_DEFAULT_EVO,
        CLK_ALPHA_PLL_TYPE_BRAMMO_EVO,
+       CLK_ALPHA_PLL_TYPE_STROMER,
        CLK_ALPHA_PLL_TYPE_MAX,
 };
 
@@ -131,6 +136,9 @@ struct alpha_pll_config {
        u32 post_div_mask;
        u32 vco_val;
        u32 vco_mask;
+       u32 status_val;
+       u32 status_mask;
+       u32 lock_det;
 };
 
 extern const struct clk_ops clk_alpha_pll_ops;
@@ -139,6 +147,7 @@ extern const struct clk_ops clk_alpha_pll_hwfsm_ops;
 extern const struct clk_ops clk_alpha_pll_postdiv_ops;
 extern const struct clk_ops clk_alpha_pll_huayra_ops;
 extern const struct clk_ops clk_alpha_pll_postdiv_ro_ops;
+extern const struct clk_ops clk_alpha_pll_stromer_ops;
 
 extern const struct clk_ops clk_alpha_pll_fabia_ops;
 extern const struct clk_ops clk_alpha_pll_fixed_fabia_ops;
@@ -188,5 +197,7 @@ void clk_lucid_evo_pll_configure(struct clk_alpha_pll *pll, struct regmap *regma
                                 const struct alpha_pll_config *config);
 void clk_rivian_evo_pll_configure(struct clk_alpha_pll *pll, struct regmap *regmap,
                                  const struct alpha_pll_config *config);
+void clk_stromer_pll_configure(struct clk_alpha_pll *pll, struct regmap *regmap,
+                              const struct alpha_pll_config *config);
 
 #endif