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banners=-,-,- X-VirusChecked: Checked Received: (qmail 21640 invoked from network); 23 Jul 2019 15:32:56 -0000 Received: from owa.digi.com (HELO MCL-VMS-XCH01.digi.com) (66.77.174.16) by server-30.tower-325.messagelabs.com with ECDHE-RSA-AES256-SHA384 encrypted SMTP; 23 Jul 2019 15:32:56 -0000 Received: from MTK-SMS-XCH04.digi.com (10.10.8.198) by MCL-VMS-XCH01.digi.com (10.5.8.49) with Microsoft SMTP Server (TLS) id 14.3.468.0; Tue, 23 Jul 2019 10:32:55 -0500 Received: from DOR-SMS-XCH01.digi.com (10.49.8.99) by MTK-SMS-XCH04.digi.com (10.10.8.198) with Microsoft SMTP Server (TLS) id 14.3.468.0; Tue, 23 Jul 2019 10:32:54 -0500 Received: from localhost.localdomain (10.101.2.92) by dor-sms-xch01.digi.com (10.49.8.99) with Microsoft SMTP Server (TLS) id 14.3.468.0; Tue, 23 Jul 2019 17:32:52 +0200 From: Jose Diaz de Grenu To: Subject: [PATCH 2/2] nvmem: imx-ocotp: allow reads with arbitrary size and offset Date: Tue, 23 Jul 2019 17:32:43 +0200 Message-ID: <1563895963-19526-3-git-send-email-Jose.DiazdeGrenu@digi.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1563895963-19526-1-git-send-email-Jose.DiazdeGrenu@digi.com> References: <1563895963-19526-1-git-send-email-Jose.DiazdeGrenu@digi.com> MIME-Version: 1.0 X-Originating-IP: [10.101.2.92] X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190723_083258_494343_86B11154 X-CRM114-Status: GOOD ( 12.79 ) 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: festevam@gmail.com, s.hauer@pengutronix.de, linux-kernel@vger.kernel.org, srinivas.kandagatla@linaro.org, linux-imx@nxp.com, kernel@pengutronix.de, shawnguo@kernel.org, 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 Currently the driver only allows to read 32 aligned 32-bit chunks. This is inconvenient when defining nvmem-cells, as they are rarely a multiple of 32 bits in size, and that makes the nvmem-consumer hardcode offsets and masks to extract the real value. Remove the limitation but keep reading in 32-bit chunks from the hardware to ensure there is no change in the behaviour. Signed-off-by: Jose Diaz de Grenu --- drivers/nvmem/imx-ocotp.c | 27 ++++++++++++--------------- 1 file changed, 12 insertions(+), 15 deletions(-) diff --git a/drivers/nvmem/imx-ocotp.c b/drivers/nvmem/imx-ocotp.c index dc86d863563a..9590eeab85d8 100644 --- a/drivers/nvmem/imx-ocotp.c +++ b/drivers/nvmem/imx-ocotp.c @@ -121,16 +121,8 @@ static int imx_ocotp_read(void *context, unsigned int offset, void *val, size_t bytes) { struct ocotp_priv *priv = context; - unsigned int count; - u32 *buf = val; + u8 *buf = val; int i, ret; - u32 index; - - index = offset >> 2; - count = bytes >> 2; - - if (count > (priv->params->nregs - index)) - count = priv->params->nregs - index; mutex_lock(&ocotp_mutex); @@ -147,9 +139,9 @@ static int imx_ocotp_read(void *context, unsigned int offset, goto read_end; } - for (i = index; i < (index + count); i++) { - *buf++ = readl(priv->base + IMX_OCOTP_OFFSET_B0W0 + - i * IMX_OCOTP_OFFSET_PER_WORD); + for (i = offset; i < (bytes + offset); i++) { + u32 word_val = readl(priv->base + IMX_OCOTP_OFFSET_B0W0 + + (i >> 2) * IMX_OCOTP_OFFSET_PER_WORD); /* 47.3.1.2 * For "read locked" registers 0xBADABADA will be returned and @@ -157,9 +149,14 @@ static int imx_ocotp_read(void *context, unsigned int offset, * software before any new write, read or reload access can be * issued */ - if (*(buf - 1) == IMX_OCOTP_READ_LOCKED_VAL) + if (word_val == IMX_OCOTP_READ_LOCKED_VAL) imx_ocotp_clr_err_if_set(priv->base); + + word_val >>= (i % 4) * 8; + + *buf++ = (u8) (word_val & 0xFF); } + ret = 0; read_end: @@ -415,8 +412,8 @@ static int imx_ocotp_write(void *context, unsigned int offset, void *val, static struct nvmem_config imx_ocotp_nvmem_config = { .name = "imx-ocotp", .read_only = false, - .word_size = 4, - .stride = 4, + .word_size = 1, + .stride = 1, .reg_read = imx_ocotp_read, .reg_write = imx_ocotp_write, }; _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel