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Wed, 28 Aug 2019 03:02:54 +0000 Received: from AM0PR04MB4481.eurprd04.prod.outlook.com ([fe80::5d98:e1f4:aa72:16b4]) by AM0PR04MB4481.eurprd04.prod.outlook.com ([fe80::5d98:e1f4:aa72:16b4%4]) with mapi id 15.20.2178.023; Wed, 28 Aug 2019 03:02:54 +0000 From: Peng Fan To: "robh+dt@kernel.org" , "mark.rutland@arm.com" , "jassisinghbrar@gmail.com" , "sudeep.holla@arm.com" , "andre.przywara@arm.com" , "f.fainelli@gmail.com" Subject: [PATCH v5 0/2] mailbox: arm: introduce smc triggered mailbox Thread-Topic: [PATCH v5 0/2] mailbox: arm: introduce smc triggered mailbox Thread-Index: AQHVXU0W/OQqpHrw2UaiSQygGBIz9Q== Date: Wed, 28 Aug 2019 03:02:54 +0000 Message-ID: <1567004515-3567-1-git-send-email-peng.fan@nxp.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-mailer: git-send-email 2.7.4 x-clientproxiedby: HK2PR02CA0163.apcprd02.prod.outlook.com (2603:1096:201:1f::23) To AM0PR04MB4481.eurprd04.prod.outlook.com (2603:10a6:208:70::15) authentication-results: spf=none (sender IP is ) smtp.mailfrom=peng.fan@nxp.com; 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DIR:OUT; SFP:1101; SCL:1; SRVR:AM0PR04MB6033; H:AM0PR04MB4481.eurprd04.prod.outlook.com; FPR:; SPF:None; LANG:en; PTR:InfoNoRecords; MX:1; A:1; received-spf: None (protection.outlook.com: nxp.com does not designate permitted sender hosts) x-ms-exchange-senderadcheck: 1 x-microsoft-antispam-message-info: MOuufvugdaLsoY3W1ukB+WMdtSjLlDAhRv4fupLXYl4+qBwd21C+Xsx/yG8oKpjo0m6mGTrqqSP2D5pZQtRu/hmWqV+T16C8ACN9VEpDV6H7zQELZtFF1OuR+2uKoZpt9tLLA429lCq69V1HwrefQScHlgDCJ+qjSp7UaCPMBzuucP/LlD95h7eQ1b2/XSfmgPlSTZ0Yoxy1jNHJbvj4NqbyrckPtV6+Bkjx25DS+KRztmM7mA5nTG0hw879dHkLAI3oVu+LLud4UQoZ2+Ha3nkGGuid7wkSBx45RvJRJZ5c1rYS89DvefBKagdAtNEO+mF0KVCpVOgbMyozexjlNCiSACAkH/9S0F8/DIx0K/65yDWsCRAAfTn0Z4OJiJ+23J1/RKnyg+8ETA7KUi9x9AkSD9gSLWxP1/MxHZSRn7A= MIME-Version: 1.0 X-OriginatorOrg: nxp.com X-MS-Exchange-CrossTenant-Network-Message-Id: d15ec50a-bf93-4ec6-b435-08d72b6438a6 X-MS-Exchange-CrossTenant-originalarrivaltime: 28 Aug 2019 03:02:54.6176 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 686ea1d3-bc2b-4c6f-a92c-d99c5c301635 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: PccFo1di8NM2BGM+WAIsfvLonKL6dpxc1RSN4xI+NEC34U7K9gWo4q6qi14B8XIJUx3VxO5oSz/sKDslHVrzvA== X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM0PR04MB6033 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190827_200302_235296_AC26E1C0 X-CRM114-Status: GOOD ( 14.44 ) X-Spam-Score: -0.2 (/) X-Spam-Report: SpamAssassin version 3.4.2 on bombadil.infradead.org summary: Content analysis details: (-0.2 points) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at https://www.dnswl.org/, no trust [40.107.3.58 listed in list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record -0.0 SPF_HELO_PASS SPF: HELO matches SPF record -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature -0.1 DKIM_VALID_EF Message has a valid DKIM or DK signature from envelope-from domain X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "devicetree@vger.kernel.org" , Peng Fan , "linux-kernel@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" , dl-linux-imx Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org From: Peng Fan V5: yaml fix V4: yaml fix for num-chans in patch 1/2. https://patchwork.kernel.org/cover/11116521/ V3: Drop interrupt Introduce transports for mem/reg usage Add chan-id for mem usage Convert to yaml format https://patchwork.kernel.org/cover/11043541/ V2: This is a modified version from Andre Przywara's patch series https://lore.kernel.org/patchwork/cover/812997/. The modification are mostly: Introduce arm,num-chans Introduce arm_smccc_mbox_cmd txdone_poll and txdone_irq are both set to false arm,func-ids are kept, but as an optional property. Rewords SCPI to SCMI, because I am trying SCMI over SMC, not SCPI. Introduce interrupts notification. [1] is a draft implementation of i.MX8MM SCMI ATF implementation that use smc as mailbox, power/clk is included, but only part of clk has been implemented to work with hardware, power domain only supports get name for now. The traditional Linux mailbox mechanism uses some kind of dedicated hardware IP to signal a condition to some other processing unit, typically a dedicated management processor. This mailbox feature is used for instance by the SCMI protocol to signal a request for some action to be taken by the management processor. However some SoCs does not have a dedicated management core to provide those services. In order to service TEE and to avoid linux shutdown power and clock that used by TEE, need let firmware to handle power and clock, the firmware here is ARM Trusted Firmware that could also run SCMI service. The existing SCMI implementation uses a rather flexible shared memory region to communicate commands and their parameters, it still requires a mailbox to actually trigger the action. This patch series provides a Linux mailbox compatible service which uses smc calls to invoke firmware code, for instance taking care of SCMI requests. The actual requests are still communicated using the standard SCMI way of shared memory regions, but a dedicated mailbox hardware IP can be replaced via this new driver. This simple driver uses the architected SMC calling convention to trigger firmware services, also allows for using "HVC" calls to call into hypervisors or firmware layers running in the EL2 exception level. Patch 1 contains the device tree binding documentation, patch 2 introduces the actual mailbox driver. Please note that this driver just provides a generic mailbox mechanism, It could support synchronous TX/RX, or synchronous TX with asynchronous RX. And while providing SCMI services was the reason for this exercise, this driver is in no way bound to this use case, but can be used generically where the OS wants to signal a mailbox condition to firmware or a hypervisor. Also the driver is in no way meant to replace any existing firmware interface, but actually to complement existing interfaces. [1] https://github.com/MrVan/arm-trusted-firmware/tree/scmi Peng Fan (2): dt-bindings: mailbox: add binding doc for the ARM SMC/HVC mailbox mailbox: introduce ARM SMC based mailbox .../devicetree/bindings/mailbox/arm-smc.yaml | 125 ++++++++++++ drivers/mailbox/Kconfig | 7 + drivers/mailbox/Makefile | 2 + drivers/mailbox/arm-smc-mailbox.c | 215 +++++++++++++++++++++ 4 files changed, 349 insertions(+) create mode 100644 Documentation/devicetree/bindings/mailbox/arm-smc.yaml create mode 100644 drivers/mailbox/arm-smc-mailbox.c