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Date:   Thu, 21 May 2020 17:06:19 +0800
From:   Weiyi Lu <weiyi.lu@...iatek.com>
To:     Enric Balletbo Serra <eballetbo@...il.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Nicolas Boichat <drinkcat@...omium.org>,
        Rob Herring <robh@...nel.org>,
        Sascha Hauer <kernel@...gutronix.de>
CC:     James Liao <jamesjj.liao@...iatek.com>,
        Fan Chen <fan.chen@...iatek.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-mediatek@...ts.infradead.org>,
        <srv_heupstream@...iatek.com>, Weiyi Lu <weiyi.lu@...iatek.com>
Subject: [PATCH v15 06/11] soc: mediatek: Add subsys clock control for bus protection

For the bus protection operations, some subsys clocks need to be enabled
before releasing the protection, and vice versa.
But those subsys clocks could only be controlled once its corresponding
power domain is turned on first.
In this patch, we add the subsys clock control into its relevant steps.

Signed-off-by: Weiyi Lu <weiyi.lu@...iatek.com>
---
 drivers/soc/mediatek/mtk-scpsys.c | 62 +++++++++++++++++++++++++++++++++++++--
 1 file changed, 60 insertions(+), 2 deletions(-)

diff --git a/drivers/soc/mediatek/mtk-scpsys.c b/drivers/soc/mediatek/mtk-scpsys.c
index 59a525a..ef2c668 100644
--- a/drivers/soc/mediatek/mtk-scpsys.c
+++ b/drivers/soc/mediatek/mtk-scpsys.c
@@ -97,6 +97,7 @@
 #define MT8173_TOP_AXI_PROT_EN_MFG_SNOOP_OUT	BIT(23)
 
 #define MAX_CLKS	3
+#define MAX_SUBSYS_CLKS 10
 
 #define MAX_STEPS	4
 
@@ -145,6 +146,8 @@ struct bus_prot {
  * @sram_pdn_bits: The mask for sram power control bits.
  * @sram_pdn_ack_bits: The mask for sram power control acked bits.
  * @basic_clk_name: The basic clocks required by this power domain.
+ * @subsys_clk_prefix: The prefix name of the clocks need to be enabled
+ *                     before releasing bus protection.
  * @caps: The flag for active wake-up action.
  * @bp_table: The mask table for multiple step bus protection.
  */
@@ -155,6 +158,7 @@ struct scp_domain_data {
 	u32 sram_pdn_bits;
 	u32 sram_pdn_ack_bits;
 	const char *basic_clk_name[MAX_CLKS];
+	const char *subsys_clk_prefix;
 	u8 caps;
 	struct bus_prot bp_table[MAX_STEPS];
 };
@@ -165,6 +169,7 @@ struct scp_domain {
 	struct generic_pm_domain genpd;
 	struct scp *scp;
 	struct clk *clk[MAX_CLKS];
+	struct clk *subsys_clk[MAX_SUBSYS_CLKS];
 	const struct scp_domain_data *data;
 	struct regulator *supply;
 };
@@ -425,16 +430,22 @@ static int scpsys_power_on(struct generic_pm_domain *genpd)
 	val |= PWR_RST_B_BIT;
 	writel(val, ctl_addr);
 
-	ret = scpsys_sram_enable(scpd, ctl_addr);
+	ret = scpsys_clk_enable(scpd->subsys_clk, MAX_SUBSYS_CLKS);
 	if (ret < 0)
 		goto err_pwr_ack;
 
+	ret = scpsys_sram_enable(scpd, ctl_addr);
+	if (ret < 0)
+		goto err_sram;
+
 	ret = scpsys_bus_protect_disable(scpd);
 	if (ret < 0)
-		goto err_pwr_ack;
+		goto err_sram;
 
 	return 0;
 
+err_sram:
+	scpsys_clk_disable(scpd->subsys_clk, MAX_SUBSYS_CLKS);
 err_pwr_ack:
 	scpsys_clk_disable(scpd->clk, MAX_CLKS);
 err_clk:
@@ -461,6 +472,8 @@ static int scpsys_power_off(struct generic_pm_domain *genpd)
 	if (ret < 0)
 		goto out;
 
+	scpsys_clk_disable(scpd->subsys_clk, MAX_SUBSYS_CLKS);
+
 	/* subsys power off */
 	val = readl(ctl_addr);
 	val |= PWR_ISO_BIT;
@@ -498,6 +511,39 @@ static int scpsys_power_off(struct generic_pm_domain *genpd)
 	return ret;
 }
 
+static int init_subsys_clks(struct platform_device *pdev,
+		const char *prefix, struct clk **clk)
+{
+	struct device_node *node = pdev->dev.of_node;
+	u32 prefix_len, sub_clk_cnt = 0;
+	struct property *prop;
+	const char *clk_name;
+
+	prefix_len = strlen(prefix);
+
+	of_property_for_each_string(node, "clock-names", prop, clk_name) {
+		if (!strncmp(clk_name, prefix, prefix_len) &&
+				(clk_name[prefix_len] == '-')) {
+			if (sub_clk_cnt >= MAX_SUBSYS_CLKS) {
+				dev_err(&pdev->dev,
+					"subsys clk out of range %d\n",
+					sub_clk_cnt);
+				return -EINVAL;
+			}
+
+			clk[sub_clk_cnt] = devm_clk_get(&pdev->dev,
+						clk_name);
+
+			if (IS_ERR(clk[sub_clk_cnt]))
+				return PTR_ERR(clk[sub_clk_cnt]);
+
+			sub_clk_cnt++;
+		}
+	}
+
+	return sub_clk_cnt;
+}
+
 static int init_basic_clks(struct platform_device *pdev, struct clk **clk,
 			const char * const *name)
 {
@@ -596,6 +642,18 @@ static struct scp *init_scp(struct platform_device *pdev,
 		if (ret)
 			return ERR_PTR(ret);
 
+		if (data->subsys_clk_prefix) {
+			ret = init_subsys_clks(pdev,
+					data->subsys_clk_prefix,
+					scpd->subsys_clk);
+			if (ret < 0) {
+				dev_err(&pdev->dev,
+					"%s: subsys clk unavailable\n",
+					data->name);
+				return ERR_PTR(ret);
+			}
+		}
+
 		genpd->name = data->name;
 		genpd->power_off = scpsys_power_off;
 		genpd->power_on = scpsys_power_on;
-- 
1.8.1.1.dirty

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