From patchwork Thu Nov 2 07:49:14 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Viacheslav X-Patchwork-Id: 740548 Received: from lindbergh.monkeyblade.net (lindbergh.monkeyblade.net [23.128.96.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 2DA3763DE for ; Thu, 2 Nov 2023 07:49:35 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=lexina.in header.i=@lexina.in header.b="M+uw87Mk" Received: from mx.msync.work (mx.msync.work [62.182.159.68]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D6E6D128; Thu, 2 Nov 2023 00:49:26 -0700 (PDT) Received: from [127.0.0.1] (localhost [127.0.0.1]) by localhost (Mailerdaemon) with ESMTPSA id BBE92147B81; Thu, 2 Nov 2023 07:49:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=lexina.in; s=dkim; t=1698911364; h=from:subject:date:message-id:to:mime-version: content-transfer-encoding:in-reply-to:references; bh=7g9Pd3xFizPczsPF4psnwonGnJy6OcmmDqrxbFQxHFA=; b=M+uw87MkkWBDPTm4zcqCcvkJd1HPT1Mp+O3c6qIgnCLra9izQxIQo39ejYoKlNdR9sdnwU TDxY8sJRRkQeTJYXryyBrXgbOZuZwHGbbWSMFa9cA6S4mRdGXIQbtwUr58eEuO32ceqwkY MS2gNiBWZ9r1RVH/1URcfdsseaU0QvUNGL+Vx6Z1rGAVuue3J8oetuCMprR+f2lOnrCrcb vp0GgTtcpBBLxiEQ4w0kLqOeYEMJnYEopdtGWIeoEQg7YFRbV4hITOZGCZDlQvZz/aLaHR 70WDEDufucemByUhdBL/q4Y3uZd3NCq1h/8EY+s402mHOB253Tfa6EIBCXt4Zg== From: Viacheslav Bocharov To: Neil Armstrong , Kevin Hilman , Martin Blumenstingl , linux-amlogic@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org Subject: [PATCH 2/4] firmware: meson_sm: Add chipid number sysfs entry Date: Thu, 2 Nov 2023 10:49:14 +0300 Message-Id: <20231102074916.3280809-3-adeep@lexina.in> In-Reply-To: <20231102074916.3280809-1-adeep@lexina.in> References: <20231102074916.3280809-1-adeep@lexina.in> Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Last-TLS-Session-Version: TLSv1.3 The Amlogic Meson SoC Secure Monitor implements a call to retrieve an unique CHIP ID with CPU ID (128 bits length) starting from the GX Family and all new families. The chipid string is simply exposed as a sysfs entry under the firmware sysfs directory. Signed-off-by: Viacheslav Bocharov --- drivers/firmware/meson/meson_sm.c | 54 ++++++++++++++++++++++++++++++- 1 file changed, 53 insertions(+), 1 deletion(-) diff --git a/drivers/firmware/meson/meson_sm.c b/drivers/firmware/meson/meson_sm.c index c1c694b485ee..2820f4ac871b 100644 --- a/drivers/firmware/meson/meson_sm.c +++ b/drivers/firmware/meson/meson_sm.c @@ -240,9 +240,10 @@ struct meson_sm_firmware *meson_sm_get(struct device_node *sm_node) } EXPORT_SYMBOL_GPL(meson_sm_get); -#define SM_CHIP_ID_LENGTH 119 +#define SM_CHIP_ID_LENGTH 128 #define SM_CHIP_ID_OFFSET 4 #define SM_CHIP_ID_SIZE 12 +#define SM_CHIP_IDv2_SIZE 16 static ssize_t serial_show(struct device *dev, struct device_attribute *attr, char *buf) @@ -274,8 +275,59 @@ static ssize_t serial_show(struct device *dev, struct device_attribute *attr, static DEVICE_ATTR_RO(serial); +static ssize_t chipid_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct platform_device *pdev = to_platform_device(dev); + struct meson_sm_firmware *fw; + uint8_t *id_buf; + int ret; + + fw = platform_get_drvdata(pdev); + + id_buf = kmalloc(SM_CHIP_ID_LENGTH, GFP_KERNEL); + if (!id_buf) + return -ENOMEM; + + ret = meson_sm_call_read(fw, id_buf, SM_CHIP_ID_LENGTH, SM_GET_CHIP_ID, + 2, 0, 0, 0, 0); + if (ret < 0) { + kfree(id_buf); + return ret; + } + + int version = *((unsigned int *)id_buf); + + if (version == 2) + ret = scnprintf(buf, PAGE_SIZE, "%16phN\n", &id_buf[SM_CHIP_ID_OFFSET]); + else { + /** + * Legacy 12-byte chip ID read out, transform data + * to expected order format. + */ + uint8_t *buff; + + buff = kmalloc(SM_CHIP_ID_LENGTH, GFP_KERNEL); + if (!buff) + return -ENOMEM; + ((uint32_t *)buff)[0] = 0; // CPU_ID is empty + /* Transform into expected order for display */ + ch = (uint8_t *)(id_buf + 4); + for (i = 0; i < 12; i++) + buff[i + 4] = ch[11 - i]; + ret = scnprintf(buf, PAGE_SIZE, "%16phN\n", &buff); + kfree(buff); + } + + kfree(id_buf); + return ret; +} + +static DEVICE_ATTR_RO(chipid); + static struct attribute *meson_sm_sysfs_attributes[] = { &dev_attr_serial.attr, + &dev_attr_chipid.attr, NULL, };