linux-kernel - [PATCH v8 11/14] soc: mediatek: Add extra sram control

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Date:   Mon, 28 Oct 2019 10:48:15 +0800
From:   Weiyi Lu <weiyi.lu@...iatek.com>
To:     Nicolas Boichat <drinkcat@...omium.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Rob Herring <robh@...nel.org>
CC:     James Liao <jamesjj.liao@...iatek.com>,
        Fan Chen <fan.chen@...iatek.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-mediatek@...ts.infradead.org>,
        <srv_heupstream@...iatek.com>, Weiyi Lu <weiyi.lu@...iatek.com>,
        Yong Wu <yong.wu@...iatek.com>
Subject: [PATCH v8 11/14] soc: mediatek: Add extra sram control

For some power domains like vpu_core on MT8183 whose sram need to
do clock and internal isolation while power on/off sram.
We add a flag "sram_iso_ctrl" in scp_domain_data to judge if we
need to do the extra sram isolation control or not.

Signed-off-by: Weiyi Lu <weiyi.lu@...iatek.com>
---
 drivers/soc/mediatek/mtk-scpsys.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/drivers/soc/mediatek/mtk-scpsys.c b/drivers/soc/mediatek/mtk-scpsys.c
index 0b5055c..992e5b3 100644
--- a/drivers/soc/mediatek/mtk-scpsys.c
+++ b/drivers/soc/mediatek/mtk-scpsys.c
@@ -57,6 +57,8 @@
 #define PWR_ON_BIT			BIT(2)
 #define PWR_ON_2ND_BIT			BIT(3)
 #define PWR_CLK_DIS_BIT			BIT(4)
+#define PWR_SRAM_CLKISO_BIT		BIT(5)
+#define PWR_SRAM_ISOINT_B_BIT		BIT(6)
 
 #define PWR_STATUS_CONN			BIT(1)
 #define PWR_STATUS_DISP			BIT(3)
@@ -115,6 +117,8 @@ enum clk_id {
  * @name: The domain name.
  * @sta_mask: The mask for power on/off status bit.
  * @ctl_offs: The offset for main power control register.
+ * @sram_iso_ctrl: The flag to judge if the power domain need to do
+ *                 the extra sram isolation control.
  * @sram_pdn_bits: The mask for sram power control bits.
  * @sram_pdn_ack_bits: The mask for sram power control acked bits.
  * @bus_prot_mask: The mask for single step bus protection.
@@ -130,6 +134,7 @@ struct scp_domain_data {
 	const char *name;
 	u32 sta_mask;
 	int ctl_offs;
+	bool sram_iso_ctrl;
 	u32 sram_pdn_bits;
 	u32 sram_pdn_ack_bits;
 	u32 bus_prot_mask;
@@ -268,6 +273,14 @@ static int scpsys_sram_enable(struct scp_domain *scpd, void __iomem *ctl_addr)
 			return ret;
 	}
 
+	if (scpd->data->sram_iso_ctrl)	{
+		val = readl(ctl_addr) | PWR_SRAM_ISOINT_B_BIT;
+		writel(val, ctl_addr);
+		udelay(1);
+		val &= ~PWR_SRAM_CLKISO_BIT;
+		writel(val, ctl_addr);
+	}
+
 	return 0;
 }
 
@@ -277,6 +290,15 @@ static int scpsys_sram_disable(struct scp_domain *scpd, void __iomem *ctl_addr)
 	u32 pdn_ack = scpd->data->sram_pdn_ack_bits;
 	int tmp;
 
+	if (scpd->data->sram_iso_ctrl)	{
+		val = readl(ctl_addr);
+		val |= PWR_SRAM_CLKISO_BIT;
+		writel(val, ctl_addr);
+		val &= ~PWR_SRAM_ISOINT_B_BIT;
+		writel(val, ctl_addr);
+		udelay(1);
+	}
+
 	val = readl(ctl_addr) | scpd->data->sram_pdn_bits;
 	writel(val, ctl_addr);
 
-- 
1.8.1.1.dirty