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From:   Chunfeng Yun <chunfeng.yun@mediatek.com>
To:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Rob Herring <robh+dt@kernel.org>,
        Mathias Nyman <mathias.nyman@intel.com>
CC:     Chunfeng Yun <chunfeng.yun@mediatek.com>,
        Matthias Brugger <matthias.bgg@gmail.com>,
        <linux-usb@vger.kernel.org>,
        <linux-arm-kernel@lists.infradead.org>,
        <linux-mediatek@lists.infradead.org>, <devicetree@vger.kernel.org>,
        <linux-kernel@vger.kernel.org>,
        Sergei Shtylyov <sergei.shtylyov@gmail.com>,
        Eddie Hung <eddie.hung@mediatek.com>,
        Nicolas Boichat <drinkcat@chromium.org>
Subject: [PATCH v2 06/13] usb: xhci-mtk: support ip-sleep wakeup for MT8183
Date:   Tue, 23 Mar 2021 15:02:48 +0800
Message-ID: <1616482975-17841-6-git-send-email-chunfeng.yun@mediatek.com>
In-Reply-To: <1616482975-17841-1-git-send-email-chunfeng.yun@mediatek.com>
References: <1616482975-17841-1-git-send-email-chunfeng.yun@mediatek.com>
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Precedence: bulk

Add support ip-sleep wakeup for MT8183, it's similar to MT8173,
and it's also a specific one, but not following IPM rule.
Due to the index 2 already used by many DTS, it's better to keep
it unchanged for backward compatibility, treat specific ones without
following IPM rule as revision 1.x, meanwhile reserve 3~10 for
later revision that follows the IPM rule.

Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
---
v2:
   1. fix typo suggested by Sergei
   2. fix build warning - Woverflow
   3. modify revision format
---
 drivers/usb/host/xhci-mtk.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/drivers/usb/host/xhci-mtk.c b/drivers/usb/host/xhci-mtk.c
index 09f2ddbfe8b9..ef2c74281ab4 100644
--- a/drivers/usb/host/xhci-mtk.c
+++ b/drivers/usb/host/xhci-mtk.c
@@ -57,12 +57,19 @@
 #define CTRL_U2_FORCE_PLL_STB	BIT(28)
 
 /* usb remote wakeup registers in syscon */
+
 /* mt8173 etc */
 #define PERI_WK_CTRL1	0x4
 #define WC1_IS_C(x)	(((x) & 0xf) << 26)  /* cycle debounce */
 #define WC1_IS_EN	BIT(25)
 #define WC1_IS_P	BIT(6)  /* polarity for ip sleep */
 
+/* mt8183 */
+#define PERI_WK_CTRL0	0x0
+#define WC0_IS_C(x)	((u32)(((x) & 0xf) << 28))  /* cycle debounce */
+#define WC0_IS_P	BIT(12)	/* polarity */
+#define WC0_IS_EN	BIT(6)
+
 /* mt2712 etc */
 #define PERI_SSUSB_SPM_CTRL	0x0
 #define SSC_IP_SLEEP_EN	BIT(4)
@@ -71,6 +78,7 @@
 enum ssusb_uwk_vers {
 	SSUSB_UWK_V1 = 1,
 	SSUSB_UWK_V2,
+	SSUSB_UWK_V1_1 = 101,	/* specific revision 1.01 */
 };
 
 static int xhci_mtk_host_enable(struct xhci_hcd_mtk *mtk)
@@ -300,6 +308,11 @@ static void usb_wakeup_ip_sleep_set(struct xhci_hcd_mtk *mtk, bool enable)
 		msk = WC1_IS_EN | WC1_IS_C(0xf) | WC1_IS_P;
 		val = enable ? (WC1_IS_EN | WC1_IS_C(0x8)) : 0;
 		break;
+	case SSUSB_UWK_V1_1:
+		reg = mtk->uwk_reg_base + PERI_WK_CTRL0;
+		msk = WC0_IS_EN | WC0_IS_C(0xf) | WC0_IS_P;
+		val = enable ? (WC0_IS_EN | WC0_IS_C(0x8)) : 0;
+		break;
 	case SSUSB_UWK_V2:
 		reg = mtk->uwk_reg_base + PERI_SSUSB_SPM_CTRL;
 		msk = SSC_IP_SLEEP_EN | SSC_SPM_INT_EN;
-- 
2.18.0