From patchwork Mon Apr 25 05:28:06 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Drew Fustini X-Patchwork-Id: 565896 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id C2BEDC433EF for ; Mon, 25 Apr 2022 05:29:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241263AbiDYFc4 (ORCPT ); Mon, 25 Apr 2022 01:32:56 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33276 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S241267AbiDYFcu (ORCPT ); Mon, 25 Apr 2022 01:32:50 -0400 Received: from mail-pl1-x636.google.com (mail-pl1-x636.google.com [IPv6:2607:f8b0:4864:20::636]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 65F16271B for ; Sun, 24 Apr 2022 22:29:47 -0700 (PDT) Received: by mail-pl1-x636.google.com with SMTP id k4so12963740plk.7 for ; Sun, 24 Apr 2022 22:29:47 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=baylibre-com.20210112.gappssmtp.com; s=20210112; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=v1IWN4lWqJqpX40fNSh2eZLPh8Lvp6Dl9ZDbsdmWTqI=; b=lqHFsAoZlHZXSRJq/RtFfRz7RuAYIFhplhSopMyESsbG1CCQ2/HAj2vLem1B3OSkIY qOygmK6oO8Fl/xykv5I16G6EGVGEaJxVE/cwnBzkqEcJRgRopF0XnkretFmwyouqqGR5 MyOKj62fq/NDJlFm4qCIE/aUwgpK1fHD8DBRaPkSABgHfKC1MdzNyg58TZhoK8dyh+pG Ubwt4TkCt23sLGssZCuJyIQXHjap473rgIeIaSYRVFTqUI34UsvAtT+KloG6AAtssaie gGC/zodhM7V3jmHsF7vn6n4f3VetBBzxc2e4fOUfwZOANMgiCkV4UTATud1ZS0TLdUja e+ZQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=v1IWN4lWqJqpX40fNSh2eZLPh8Lvp6Dl9ZDbsdmWTqI=; b=vdBXZvhZXI62tXr6waaq3+Rbw5vaohIkBnWMzvlEFRnGGFG02SKIDkwlTmXRgz+vmH 65lZyAcZ/f5bGp0bmGBwd7X/xSIe9nsz0nXnDo5J2ymL/qeIcwhLERyky6ljN0cc3vRi 9kRPWVQvkizVtnpg5VhykgFLPQOTYE4B56TEsCsp710ee0jPdSsIErth4K49dJqf/l6B iuLa7KYx82qCtt/iIlv9fq+iJnCKAanvsUV5YX5q7jQnx/Gn8vVicvOENPYJ2Rh8H6EC sXm9K47RJNiMS14bB1gGIEWHzQoo21Nzy5lE31xaDAJjHO6Ugayu7KN0aU8EV9KFU3N9 hsaw== X-Gm-Message-State: AOAM5310VtHiIuKB0cixpcAqHsL817XZKVLOx5U+fUM3SHJ9Hb2bwuQY y+Nbb6v0pIPqEf8trbpe1wSiAg== X-Google-Smtp-Source: ABdhPJzCMZt/PZweE/sFV+76M0SKokRPHoabxIY+QlCFkDB5u/f2fHWjyZhEU0e2mGMEdzYMyX8Tmw== X-Received: by 2002:a17:90b:4a41:b0:1d2:a83c:e480 with SMTP id lb1-20020a17090b4a4100b001d2a83ce480mr29202756pjb.18.1650864586885; Sun, 24 Apr 2022 22:29:46 -0700 (PDT) Received: from x1.hsd1.or.comcast.net ([2601:1c2:1001:7090:237c:3672:1f2:b81c]) by smtp.gmail.com with ESMTPSA id 5-20020a631045000000b0039d942d18f0sm8282017pgq.48.2022.04.24.22.29.46 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 24 Apr 2022 22:29:46 -0700 (PDT) From: Drew Fustini To: Rob Herring , Krzysztof Kozlowski , Nishanth Menon , Santosh Shilimkar , Dave Gerlach , Tony Lindgren Cc: devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Drew Fustini , Keerthy Subject: [PATCH 2/2] soc: ti: wkup_m3_ipc: Add support for i2c voltage scaling Date: Sun, 24 Apr 2022 22:28:06 -0700 Message-Id: <20220425052806.484590-3-dfustini@baylibre.com> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20220425052806.484590-1-dfustini@baylibre.com> References: <20220425052806.484590-1-dfustini@baylibre.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org From: Dave Gerlach Allow loading of a binary containing i2c scaling sequences to be provided to the wkup_m3 firmware in order to properly scale voltage rails on the PMIC during low power modes like DeepSleep0. Proper binary format is determined by the FW in use. Code expects firmware to have 0x0C57 present as the first two bytes followed by one byte defining offset to sleep sequence followed by one byte defining offset to wake sequence and then lastly both sequences. Each sequence is a series of I2C transfers in the form: u8 length | u8 chip address | u8 byte0/reg address | u8 byte1 | u8 byteN .. The length indicates the number of bytes to transfer, including the register address. The length of each transfer is limited by the I2C buffer size of 32 bytes. Based on previous work by Russ Dill. Signed-off-by: Dave Gerlach Signed-off-by: Keerthy [dfustini: add NULL argument to rproc_da_to_va() call] [dfustini: replace FW_ACTION_HOTPLUG with FW_ACTION_UEVENT] Signed-off-by: Drew Fustini --- drivers/soc/ti/wkup_m3_ipc.c | 93 +++++++++++++++++++++++++++++++++++- include/linux/wkup_m3_ipc.h | 9 ++++ 2 files changed, 101 insertions(+), 1 deletion(-) diff --git a/drivers/soc/ti/wkup_m3_ipc.c b/drivers/soc/ti/wkup_m3_ipc.c index 988162dd153a..007daf9af8b5 100644 --- a/drivers/soc/ti/wkup_m3_ipc.c +++ b/drivers/soc/ti/wkup_m3_ipc.c @@ -8,6 +8,7 @@ */ #include +#include #include #include #include @@ -55,6 +56,12 @@ #define M3_STATE_MSG_FOR_LP 3 #define M3_STATE_MSG_FOR_RESET 4 +#define WKUP_M3_SD_FW_MAGIC 0x570C + +#define WKUP_M3_DMEM_START 0x80000 +#define WKUP_M3_AUXDATA_OFFSET 0x1000 +#define WKUP_M3_AUXDATA_SIZE 0xFF + static struct wkup_m3_ipc *m3_ipc_state; static const struct wkup_m3_wakeup_src wakeups[] = { @@ -75,6 +82,81 @@ static const struct wkup_m3_wakeup_src wakeups[] = { {.irq_nr = 0, .src = "Unknown"}, }; +/** + * wkup_m3_copy_aux_data - Copy auxiliary data to special region of m3 dmem + * @data - pointer to data + * @sz - size of data to copy (limit 256 bytes) + * + * Copies any additional blob of data to the wkup_m3 dmem to be used by the + * firmware + */ +static unsigned long wkup_m3_copy_aux_data(struct wkup_m3_ipc *m3_ipc, + const void *data, int sz) +{ + unsigned long aux_data_dev_addr; + void *aux_data_addr; + + aux_data_dev_addr = WKUP_M3_DMEM_START + WKUP_M3_AUXDATA_OFFSET; + aux_data_addr = rproc_da_to_va(m3_ipc->rproc, + aux_data_dev_addr, + WKUP_M3_AUXDATA_SIZE, + NULL); + memcpy(aux_data_addr, data, sz); + + return WKUP_M3_AUXDATA_OFFSET; +} + +static void wkup_m3_scale_data_fw_cb(const struct firmware *fw, void *context) +{ + unsigned long val, aux_base; + struct wkup_m3_scale_data_header hdr; + struct wkup_m3_ipc *m3_ipc = context; + struct device *dev = m3_ipc->dev; + + if (!fw) { + dev_err(dev, "Voltage scale fw name given but file missing.\n"); + return; + } + + memcpy(&hdr, fw->data, sizeof(hdr)); + + if (hdr.magic != WKUP_M3_SD_FW_MAGIC) { + dev_err(dev, "PM: Voltage Scale Data binary does not appear valid.\n"); + goto release_sd_fw; + } + + aux_base = wkup_m3_copy_aux_data(m3_ipc, fw->data + sizeof(hdr), + fw->size - sizeof(hdr)); + + val = (aux_base + hdr.sleep_offset); + val |= ((aux_base + hdr.wake_offset) << 16); + + m3_ipc->volt_scale_offsets = val; + +release_sd_fw: + release_firmware(fw); +}; + +static int wkup_m3_init_scale_data(struct wkup_m3_ipc *m3_ipc, + struct device *dev) +{ + int ret = 0; + + /* + * If no name is provided, user has already been warned, pm will + * still work so return 0 + */ + + if (!m3_ipc->sd_fw_name) + return ret; + + ret = request_firmware_nowait(THIS_MODULE, FW_ACTION_UEVENT, + m3_ipc->sd_fw_name, dev, GFP_ATOMIC, + m3_ipc, wkup_m3_scale_data_fw_cb); + + return ret; +} + static void am33xx_txev_eoi(struct wkup_m3_ipc *m3_ipc) { writel(AM33XX_M3_TXEV_ACK, @@ -139,6 +221,7 @@ static irqreturn_t wkup_m3_txev_handler(int irq, void *ipc_data) } m3_ipc->state = M3_STATE_INITED; + wkup_m3_init_scale_data(m3_ipc, dev); complete(&m3_ipc->sync_complete); break; case M3_STATE_MSG_FOR_RESET: @@ -300,12 +383,15 @@ static int wkup_m3_prepare_low_power(struct wkup_m3_ipc *m3_ipc, int state) switch (state) { case WKUP_M3_DEEPSLEEP: m3_power_state = IPC_CMD_DS0; + wkup_m3_ctrl_ipc_write(m3_ipc, m3_ipc->volt_scale_offsets, 5); break; case WKUP_M3_STANDBY: m3_power_state = IPC_CMD_STANDBY; + wkup_m3_ctrl_ipc_write(m3_ipc, DS_IPC_DEFAULT, 5); break; case WKUP_M3_IDLE: m3_power_state = IPC_CMD_IDLE; + wkup_m3_ctrl_ipc_write(m3_ipc, DS_IPC_DEFAULT, 5); break; default: return 1; @@ -319,7 +405,6 @@ static int wkup_m3_prepare_low_power(struct wkup_m3_ipc *m3_ipc, int state) m3_ipc->isolation_conf, 4); wkup_m3_ctrl_ipc_write(m3_ipc, DS_IPC_DEFAULT, 2); wkup_m3_ctrl_ipc_write(m3_ipc, DS_IPC_DEFAULT, 3); - wkup_m3_ctrl_ipc_write(m3_ipc, DS_IPC_DEFAULT, 5); wkup_m3_ctrl_ipc_write(m3_ipc, DS_IPC_DEFAULT, 6); wkup_m3_ctrl_ipc_write(m3_ipc, DS_IPC_DEFAULT, 7); @@ -528,6 +613,12 @@ static int wkup_m3_ipc_probe(struct platform_device *pdev) if (of_find_property(np, "ti,set-io-isolation", NULL)) wkup_m3_set_io_isolation(m3_ipc); + ret = of_property_read_string(np, "ti,scale-data-fw", + &m3_ipc->sd_fw_name); + if (ret) { + dev_dbg(dev, "Voltage scaling data blob not provided from DT.\n"); + }; + /* * Wait for firmware loading completion in a thread so we * can boot the wkup_m3 as soon as it's ready without holding diff --git a/include/linux/wkup_m3_ipc.h b/include/linux/wkup_m3_ipc.h index b706eac58f92..fef0fac60f8c 100644 --- a/include/linux/wkup_m3_ipc.h +++ b/include/linux/wkup_m3_ipc.h @@ -37,6 +37,9 @@ struct wkup_m3_ipc { int isolation_conf; int state; + unsigned long volt_scale_offsets; + const char *sd_fw_name; + struct completion sync_complete; struct mbox_client mbox_client; struct mbox_chan *mbox; @@ -50,6 +53,12 @@ struct wkup_m3_wakeup_src { char src[10]; }; +struct wkup_m3_scale_data_header { + u16 magic; + u8 sleep_offset; + u8 wake_offset; +} __packed; + struct wkup_m3_ipc_ops { void (*set_mem_type)(struct wkup_m3_ipc *m3_ipc, int mem_type); void (*set_resume_address)(struct wkup_m3_ipc *m3_ipc, void *addr);