[PATCH V5] clk: qcom: clk-alpha-pll: Add support for Stromer PLLs
From: Kathiravan Thirumoorthy
Date: Fri Jan 20 2023 - 03:27:04 EST
From: Varadarajan Narayanan <quic_varada@xxxxxxxxxxx>
Add programming sequence support for managing the Stromer
PLLs.
Co-developed-by: Sricharan R <quic_srichara@xxxxxxxxxxx>
Signed-off-by: Sricharan R <quic_srichara@xxxxxxxxxxx>
Signed-off-by: Varadarajan Narayanan <quic_varada@xxxxxxxxxxx>
Signed-off-by: Kathiravan T <quic_kathirav@xxxxxxxxxxx>
---
Changes since V4:
- Introduced a separate function clk_stromer_pll_configure()
instead of making changes in clk_alpha_pll_configure() - Stephen Boyd
- Updated the copyright year to 2023 - Stephen Boyd
- Minor changes - Stephen Boyd
- Renamed the variables 'status_reg_val' and 'status_reg_mask'
to 'status_val' and 'status_mask' respectively
Changes since V3:
- Updated the title with correct patch version
Changes since V2:
- splitted this patch from IPQ5018 series[1]
- Rebased on linux-6.2-rc1
[1]
https://lore.kernel.org/linux-arm-msm/20220621161126.15883-1-quic_srichara@xxxxxxxxxxx/
drivers/clk/qcom/clk-alpha-pll.c | 128 ++++++++++++++++++++++++++++++-
drivers/clk/qcom/clk-alpha-pll.h | 13 +++-
2 files changed, 139 insertions(+), 2 deletions(-)
diff --git a/drivers/clk/qcom/clk-alpha-pll.c b/drivers/clk/qcom/clk-alpha-pll.c
index f9e4cfd7261c..d841ec414072 100644
--- 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
@@ -2324,3 +2338,115 @@ 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 2bdae362c827..33b8badb9fb0 100644
--- 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;
@@ -187,5 +196,7 @@ 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
--
2.17.1