diff mbox series

[V4,2/4] clk: qcom: branch: Add mem ops support for branch2 clocks

Message ID 20231117095558.3313877-3-quic_imrashai@quicinc.com
State Superseded
Headers show
Series Add support for Qualcomm ECPRI clock controller | expand

Commit Message

Imran Shaik Nov. 17, 2023, 9:55 a.m. UTC 
From: Taniya Das <quic_tdas@quicinc.com>

Add the support for mem ops implementation to handle the sequence of
enable/disable of the memories in ethernet PHY, prior to enable/disable
of the respective clocks, which helps retain the respecive block's
register contents.

Signed-off-by: Taniya Das <quic_tdas@quicinc.com>
Signed-off-by: Imran Shaik <quic_imrashai@quicinc.com>
---
 drivers/clk/qcom/clk-branch.c | 39 +++++++++++++++++++++++++++++++++++
 drivers/clk/qcom/clk-branch.h | 21 +++++++++++++++++++
 2 files changed, 60 insertions(+)

Comments

Imran Shaik Nov. 23, 2023, 6:20 a.m. UTC | #1 
On 11/23/2023 1:39 AM, Konrad Dybcio wrote:
> 
> 
> On 11/17/23 10:55, Imran Shaik wrote:
>> From: Taniya Das <quic_tdas@quicinc.com>
>>
>> Add the support for mem ops implementation to handle the sequence of
>> enable/disable of the memories in ethernet PHY, prior to enable/disable
>> of the respective clocks, which helps retain the respecive block's
>> register contents.
>>
>> Signed-off-by: Taniya Das <quic_tdas@quicinc.com>
>> Signed-off-by: Imran Shaik <quic_imrashai@quicinc.com>
>> ---
>>   drivers/clk/qcom/clk-branch.c | 39 +++++++++++++++++++++++++++++++++++
>>   drivers/clk/qcom/clk-branch.h | 21 +++++++++++++++++++
>>   2 files changed, 60 insertions(+)
>>
>> diff --git a/drivers/clk/qcom/clk-branch.c 
>> b/drivers/clk/qcom/clk-branch.c
>> index fc4735f74f0f..61bdd2147bed 100644
>> --- a/drivers/clk/qcom/clk-branch.c
>> +++ b/drivers/clk/qcom/clk-branch.c
>> @@ -1,6 +1,7 @@
>>   // SPDX-License-Identifier: GPL-2.0
>>   /*
>>    * Copyright (c) 2013, The Linux Foundation. All rights reserved.
>> + * Copyright (c) 2023, Qualcomm Innovation Center, Inc. All rights 
>> reserved.
>>    */
>>   #include <linux/kernel.h>
>> @@ -134,6 +135,44 @@ static void clk_branch2_disable(struct clk_hw *hw)
>>       clk_branch_toggle(hw, false, clk_branch2_check_halt);
>>   }
>> +static int clk_branch2_mem_enable(struct clk_hw *hw)
>> +{
>> +    struct clk_mem_branch *mem_br = to_clk_mem_branch(hw);
>> +    struct clk_branch branch = mem_br->branch;
>> +    const char *name = clk_hw_get_name(&branch.clkr.hw);
> Bit of a microoptimization, but adding this implicitly in the WARN
> would only execute clk_hw_get_name when necessary
> 

Sure, will remove this line and use the clk_hw_get_name implicitly in WARN.

>> +    u32 val;
>> +    int ret;
>> +
>> +    regmap_update_bits(branch.clkr.regmap, mem_br->mem_enable_reg,
>> +            mem_br->mem_enable_ack_mask, mem_br->mem_enable_ack_mask);
> It's quite a nit from me, but it would be nice to have the next line 
> aligned
> with the opening brace (with a tab size of 8)
> 
> Konrad

Sure, will align the lines and post another series.

Thanks,
Imran
diff mbox series

Patch

diff --git a/drivers/clk/qcom/clk-branch.c b/drivers/clk/qcom/clk-branch.c
index fc4735f74f0f..61bdd2147bed 100644
--- a/drivers/clk/qcom/clk-branch.c
+++ b/drivers/clk/qcom/clk-branch.c
@@ -1,6 +1,7 @@ 
 // SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright (c) 2013, The Linux Foundation. All rights reserved.
+ * Copyright (c) 2023, Qualcomm Innovation Center, Inc. All rights reserved.
  */
 
 #include <linux/kernel.h>
@@ -134,6 +135,44 @@  static void clk_branch2_disable(struct clk_hw *hw)
 	clk_branch_toggle(hw, false, clk_branch2_check_halt);
 }
 
+static int clk_branch2_mem_enable(struct clk_hw *hw)
+{
+	struct clk_mem_branch *mem_br = to_clk_mem_branch(hw);
+	struct clk_branch branch = mem_br->branch;
+	const char *name = clk_hw_get_name(&branch.clkr.hw);
+	u32 val;
+	int ret;
+
+	regmap_update_bits(branch.clkr.regmap, mem_br->mem_enable_reg,
+			mem_br->mem_enable_ack_mask, mem_br->mem_enable_ack_mask);
+
+	ret = regmap_read_poll_timeout(branch.clkr.regmap, mem_br->mem_ack_reg,
+			val, val & mem_br->mem_enable_ack_mask, 0, 200);
+	if (ret) {
+		WARN(1, "%s mem enable failed\n", name);
+		return ret;
+	}
+
+	return clk_branch2_enable(hw);
+}
+
+static void clk_branch2_mem_disable(struct clk_hw *hw)
+{
+	struct clk_mem_branch *mem_br = to_clk_mem_branch(hw);
+
+	regmap_update_bits(mem_br->branch.clkr.regmap, mem_br->mem_enable_reg,
+						mem_br->mem_enable_ack_mask, 0);
+
+	return clk_branch2_disable(hw);
+}
+
+const struct clk_ops clk_branch2_mem_ops = {
+	.enable = clk_branch2_mem_enable,
+	.disable = clk_branch2_mem_disable,
+	.is_enabled = clk_is_enabled_regmap,
+};
+EXPORT_SYMBOL_GPL(clk_branch2_mem_ops);
+
 const struct clk_ops clk_branch2_ops = {
 	.enable = clk_branch2_enable,
 	.disable = clk_branch2_disable,
diff --git a/drivers/clk/qcom/clk-branch.h b/drivers/clk/qcom/clk-branch.h
index 0cf800b9d08d..8ffed603c050 100644
--- a/drivers/clk/qcom/clk-branch.h
+++ b/drivers/clk/qcom/clk-branch.h
@@ -38,6 +38,23 @@  struct clk_branch {
 	struct clk_regmap clkr;
 };
 
+/**
+ * struct clk_mem_branch - gating clock which are associated with memories
+ *
+ * @mem_enable_reg: branch clock memory gating register
+ * @mem_ack_reg: branch clock memory ack register
+ * @mem_enable_ack_mask: branch clock memory enable and ack field in @mem_ack_reg
+ * @branch: branch clock gating handle
+ *
+ * Clock which can gate its memories.
+ */
+struct clk_mem_branch {
+	u32	mem_enable_reg;
+	u32	mem_ack_reg;
+	u32	mem_enable_ack_mask;
+	struct clk_branch branch;
+};
+
 /* Branch clock common bits for HLOS-owned clocks */
 #define CBCR_CLK_OFF			BIT(31)
 #define CBCR_NOC_FSM_STATUS		GENMASK(30, 28)
@@ -85,8 +102,12 @@  extern const struct clk_ops clk_branch_ops;
 extern const struct clk_ops clk_branch2_ops;
 extern const struct clk_ops clk_branch_simple_ops;
 extern const struct clk_ops clk_branch2_aon_ops;
+extern const struct clk_ops clk_branch2_mem_ops;
 
 #define to_clk_branch(_hw) \
 	container_of(to_clk_regmap(_hw), struct clk_branch, clkr)
 
+#define to_clk_mem_branch(_hw) \
+	container_of(to_clk_branch(_hw), struct clk_mem_branch, branch)
+
 #endif