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Tue, 29 Oct 2019 03:53:22 -0500 Received: from DFLE115.ent.ti.com (10.64.6.36) by DFLE104.ent.ti.com (10.64.6.25) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1713.5; Tue, 29 Oct 2019 03:53:10 -0500 Received: from fllv0039.itg.ti.com (10.64.41.19) by DFLE115.ent.ti.com (10.64.6.36) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1713.5 via Frontend Transport; Tue, 29 Oct 2019 03:53:10 -0500 Received: from [172.24.190.117] (ileax41-snat.itg.ti.com [10.172.224.153]) by fllv0039.itg.ti.com (8.15.2/8.15.2) with ESMTP id x9T8rIvA090581; Tue, 29 Oct 2019 03:53:18 -0500 Subject: Re: [PATCH v3 02/14] soc: ti: k3: add navss ringacc driver To: Peter Ujfalusi , , , , References: <20191001061704.2399-1-peter.ujfalusi@ti.com> <20191001061704.2399-3-peter.ujfalusi@ti.com> From: Lokesh Vutla Message-ID: Date: Tue, 29 Oct 2019 14:22:14 +0530 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: <20191001061704.2399-3-peter.ujfalusi@ti.com> Content-Language: en-US X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20191029_015333_355126_8CB806B9 X-CRM114-Status: GOOD ( 12.57 ) 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, grygorii.strashko@ti.com, tony@atomide.com, j-keerthy@ti.com, linux-kernel@vger.kernel.org, t-kristo@ti.com, dmaengine@vger.kernel.org, dan.j.williams@intel.com, linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi Grygorii, [...snip..] > + > +static int k3_ringacc_ring_access_io(struct k3_ring *ring, void *elem, > + enum k3_ringacc_access_mode access_mode) > +{ > + void __iomem *ptr; > + > + switch (access_mode) { > + case K3_RINGACC_ACCESS_MODE_PUSH_HEAD: > + case K3_RINGACC_ACCESS_MODE_POP_HEAD: > + ptr = (void __iomem *)&ring->fifos->head_data; > + break; > + case K3_RINGACC_ACCESS_MODE_PUSH_TAIL: > + case K3_RINGACC_ACCESS_MODE_POP_TAIL: > + ptr = (void __iomem *)&ring->fifos->tail_data; > + break; > + default: > + return -EINVAL; > + } > + > + ptr += k3_ringacc_ring_get_fifo_pos(ring); > + > + switch (access_mode) { > + case K3_RINGACC_ACCESS_MODE_POP_HEAD: > + case K3_RINGACC_ACCESS_MODE_POP_TAIL: > + dev_dbg(ring->parent->dev, > + "memcpy_fromio(x): --> ptr(%p), mode:%d\n", ptr, > + access_mode); > + memcpy_fromio(elem, ptr, (4 << ring->elm_size)); Does this work for any elem_size < 64 or any element size not aligned with 64? IIUC, in message mode, ring element should be inserted in a single burst write and there is no doorbell facility. If the above conditions are not met, we are supposed to use proxy. In this driver, I don't see any restrictions on the ring element size for message mode and directly written to io. Am I missing something? Thanks and regards, Lokesh > + ring->occ--; > + break; > + case K3_RINGACC_ACCESS_MODE_PUSH_TAIL: > + case K3_RINGACC_ACCESS_MODE_PUSH_HEAD: > + dev_dbg(ring->parent->dev, > + "memcpy_toio(x): --> ptr(%p), mode:%d\n", ptr, > + access_mode); > + memcpy_toio(ptr, elem, (4 << ring->elm_size)); > + ring->free--; > + break; > + default: > + return -EINVAL; > + } > + > + dev_dbg(ring->parent->dev, "free%d index%d occ%d index%d\n", ring->free, > + ring->windex, ring->occ, ring->rindex); > + return 0; > +} > + > +static int k3_ringacc_ring_push_head_io(struct k3_ring *ring, void *elem) > +{ > + return k3_ringacc_ring_access_io(ring, elem, > + K3_RINGACC_ACCESS_MODE_PUSH_HEAD); > +} > + > +static int k3_ringacc_ring_push_io(struct k3_ring *ring, void *elem) > +{ > + return k3_ringacc_ring_access_io(ring, elem, > + K3_RINGACC_ACCESS_MODE_PUSH_TAIL); > +} > + > +static int k3_ringacc_ring_pop_io(struct k3_ring *ring, void *elem) > +{ > + return k3_ringacc_ring_access_io(ring, elem, > + K3_RINGACC_ACCESS_MODE_POP_HEAD); > +} > + > +static int k3_ringacc_ring_pop_tail_io(struct k3_ring *ring, void *elem) > +{ > + return k3_ringacc_ring_access_io(ring, elem, > + K3_RINGACC_ACCESS_MODE_POP_HEAD); > +} > + _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel