From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 29EBB1DE3A6; Mon, 10 Mar 2025 22:08:00 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741644481; cv=none; b=cp056+zor/iAmni80ttam+sbVpR1f4tBDIIC0bPeLNwoloMOJH0DmCKeidhKFadA3ISgmnS7+Uv6HdpY7nloONBZYnyPHF7xKFZOPOtuSZ5UgR+437glYRTt2v6Ylq4W9zm5ip1KR56hzsi1CGmbN/8jYze7W6aFFhXYsrqfjjc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741644481; c=relaxed/simple; bh=EFBQsxI8pshryAs5welcgFtVvdljjCYlYHIliRUCN0g=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=My+BBF9vlJEQlC73WE+03zMRNfEvwZ/toUPBKtu1pxiu5in5ksI+f6Lt0qicY6mQLdiX7h2Foau+9LdZ0hg67aKMfJRsNbDgCISHHUgZyCJZ8kVz0h4xf2RyTnAsZeC3MMDIJAa/M6GidDmQ9VXVR4KbPzJlKY4s3gXOsMV0MIg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=T7AxrnWw; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="T7AxrnWw" Received: by smtp.kernel.org (Postfix) with ESMTPS id AC7D9C4CEF1; Mon, 10 Mar 2025 22:08:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1741644480; bh=EFBQsxI8pshryAs5welcgFtVvdljjCYlYHIliRUCN0g=; h=From:Date:Subject:References:In-Reply-To:To:Cc:Reply-To:From; b=T7AxrnWwl+KG9BRTWXFgPs8c7bNcD6ugwJ7L7zXXPj7CSquyNeqGGQbCX/MNLfRtX wHoz1eF5I81ki5wNClxExGV2mi4+jKgIdg5OfGbnCt2RXhROucB2l9L0Ki+p9bzibN /x8/2LEjufteu5eKp3NVuPOHPG9u48DEgIodSCBHRY8jGc92FWq41JIBVLwCtIzXNr /caFsQAIOJkVhCNYhgB0oH4axWYMx34tw8YJt94lVgLpiXmSWDRLmq/fGg2PnK0d2s nMhkN7ikvbI3YTfUofOcjAJJ9UtTuIxU1FSvXwCM9ig5m6pzg5bx5Q5AvUyeaQNP4/ gdDteA+i1ijbQ== Received: from aws-us-west-2-korg-lkml-1.web.codeaurora.org (localhost.localdomain [127.0.0.1]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9CF95C35FF1; Mon, 10 Mar 2025 22:08:00 +0000 (UTC) From: Sasha Finkelstein via B4 Relay Date: Mon, 10 Mar 2025 23:07:59 +0100 Subject: [PATCH v3 2/3] spmi: add a spmi driver for Apple SoC Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20250310-spmi-v3-2-92a82e7d9f0d@gmail.com> References: <20250310-spmi-v3-0-92a82e7d9f0d@gmail.com> In-Reply-To: <20250310-spmi-v3-0-92a82e7d9f0d@gmail.com> To: Sven Peter , Janne Grunau , Alyssa Rosenzweig , Stephen Boyd , Rob Herring , Krzysztof Kozlowski , Conor Dooley Cc: asahi@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, Sasha Finkelstein , Jean-Francois Bortolotti X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=ed25519-sha256; t=1741644479; l=6952; i=fnkl.kernel@gmail.com; s=20241124; h=from:subject:message-id; bh=HWm9h1XrGTkFNhxBV+c5Dt9QP4ibWUbEVLcXuEk4LbU=; b=N+ISCvI9qhC6f+C9ojUGAgFxxaKOPvbTTvcggQkVCXYZk51zqzExrkC4aqa+udqMBxTAfogRa 2gmdYbUGcXYD+A60msfHJh2jUH9rksdMuFFA9XuVbHShR1hNQBHS9nS X-Developer-Key: i=fnkl.kernel@gmail.com; a=ed25519; pk=aSkp1PdZ+eF4jpMO6oLvz/YfT5XkBUneWwyhQrOgmsU= X-Endpoint-Received: by B4 Relay for fnkl.kernel@gmail.com/20241124 with auth_id=283 X-Original-From: Sasha Finkelstein Reply-To: fnkl.kernel@gmail.com From: Jean-Francois Bortolotti The connected PMU contains several useful nvmem cells such as RTC offset, boot failure counters, reboot/shutdown selector, and a few others. In addition M3+ machines have their USB-PD controller connected via SPMI. Signed-off-by: Jean-Francois Bortolotti Reviewed-by: Sven Peter Co-developed-by: Sasha Finkelstein Signed-off-by: Sasha Finkelstein --- MAINTAINERS | 1 + drivers/spmi/Kconfig | 8 ++ drivers/spmi/Makefile | 1 + drivers/spmi/spmi-apple-controller.c | 168 +++++++++++++++++++++++++++++++++++ 4 files changed, 178 insertions(+) diff --git a/MAINTAINERS b/MAINTAINERS index 271ff8110df83c2d4fe7fbbfffc0a72259460bc5..9006695261d29fbc1e15659c2b43d7afeee0b656 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -2254,6 +2254,7 @@ F: drivers/nvmem/apple-efuses.c F: drivers/pinctrl/pinctrl-apple-gpio.c F: drivers/pwm/pwm-apple.c F: drivers/soc/apple/* +F: drivers/spmi/spmi-apple-controller.c F: drivers/watchdog/apple_wdt.c F: include/dt-bindings/interrupt-controller/apple-aic.h F: include/dt-bindings/pinctrl/apple.h diff --git a/drivers/spmi/Kconfig b/drivers/spmi/Kconfig index 73780204631463631cabcbad5bf83e8dbbee94ce..9005fa91d9f4e541403ccc7bf84e0592402ac41e 100644 --- a/drivers/spmi/Kconfig +++ b/drivers/spmi/Kconfig @@ -11,6 +11,14 @@ menuconfig SPMI if SPMI +config SPMI_APPLE + tristate "Apple SoC SPMI Controller platform driver" + depends on ARCH_APPLE || COMPILE_TEST + help + If you say yes to this option, support will be included for the + SPMI controller present on many Apple SoCs, including the + t8103 (M1) and t600x (M1 Pro/Max). + config SPMI_HISI3670 tristate "Hisilicon 3670 SPMI Controller" select IRQ_DOMAIN_HIERARCHY diff --git a/drivers/spmi/Makefile b/drivers/spmi/Makefile index 7f152167bb05b2c24a0f9669f60278152898eebb..38ac635645ba65aa46cb5e8a50072ed9771e229b 100644 --- a/drivers/spmi/Makefile +++ b/drivers/spmi/Makefile @@ -4,6 +4,7 @@ # obj-$(CONFIG_SPMI) += spmi.o spmi-devres.o +obj-$(CONFIG_SPMI_APPLE) += spmi-apple-controller.o obj-$(CONFIG_SPMI_HISI3670) += hisi-spmi-controller.o obj-$(CONFIG_SPMI_MSM_PMIC_ARB) += spmi-pmic-arb.o obj-$(CONFIG_SPMI_MTK_PMIF) += spmi-mtk-pmif.o diff --git a/drivers/spmi/spmi-apple-controller.c b/drivers/spmi/spmi-apple-controller.c new file mode 100644 index 0000000000000000000000000000000000000000..697b3e8bb023566f17911fc222666d84f5e14c91 --- /dev/null +++ b/drivers/spmi/spmi-apple-controller.c @@ -0,0 +1,168 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Apple SoC SPMI device driver + * + * Copyright The Asahi Linux Contributors + * + * Inspired by: + * OpenBSD support Copyright (c) 2021 Mark Kettenis + * Correllium support Copyright (C) 2021 Corellium LLC + * hisi-spmi-controller.c + * spmi-pmic-arb.c Copyright (c) 2021, The Linux Foundation. + */ + +#include +#include +#include +#include +#include +#include + +/* SPMI Controller Registers */ +#define SPMI_STATUS_REG 0 +#define SPMI_CMD_REG 0x4 +#define SPMI_RSP_REG 0x8 + +#define SPMI_RX_FIFO_EMPTY BIT(24) + +#define REG_POLL_INTERVAL_US 10000 +#define REG_POLL_TIMEOUT_US (REG_POLL_INTERVAL_US * 5) + +struct apple_spmi { + void __iomem *regs; +}; + +#define poll_reg(spmi, reg, val, cond) \ + readl_poll_timeout((spmi)->regs + (reg), (val), (cond), \ + REG_POLL_INTERVAL_US, REG_POLL_TIMEOUT_US) + +static inline u32 apple_spmi_pack_cmd(u8 opc, u8 sid, u16 saddr, size_t len) +{ + return opc | sid << 8 | saddr << 16 | (len - 1) | (1 << 15); +} + +/* Wait for Rx FIFO to have something */ +static int apple_spmi_wait_rx_not_empty(struct spmi_controller *ctrl) +{ + struct apple_spmi *spmi = spmi_controller_get_drvdata(ctrl); + int ret; + u32 status; + + ret = poll_reg(spmi, SPMI_STATUS_REG, status, !(status & SPMI_RX_FIFO_EMPTY)); + if (ret) { + dev_err(&ctrl->dev, + "failed to wait for RX FIFO not empty\n"); + return ret; + } + + return 0; +} + +static int spmi_read_cmd(struct spmi_controller *ctrl, u8 opc, u8 sid, + u16 saddr, u8 *buf, size_t len) +{ + struct apple_spmi *spmi = spmi_controller_get_drvdata(ctrl); + u32 spmi_cmd = apple_spmi_pack_cmd(opc, sid, saddr, len); + u32 rsp; + size_t len_read = 0; + u8 i; + int ret; + + writel(spmi_cmd, spmi->regs + SPMI_CMD_REG); + + ret = apple_spmi_wait_rx_not_empty(ctrl); + if (ret) + return ret; + + /* Discard SPMI reply status */ + readl(spmi->regs + SPMI_RSP_REG); + + /* Read SPMI data reply */ + while (len_read < len) { + rsp = readl(spmi->regs + SPMI_RSP_REG); + i = 0; + while ((len_read < len) && (i < 4)) { + buf[len_read++] = ((0xff << (8 * i)) & rsp) >> (8 * i); + i += 1; + } + } + + return 0; +} + +static int spmi_write_cmd(struct spmi_controller *ctrl, u8 opc, u8 sid, + u16 saddr, const u8 *buf, size_t len) +{ + struct apple_spmi *spmi = spmi_controller_get_drvdata(ctrl); + u32 spmi_cmd = apple_spmi_pack_cmd(opc, sid, saddr, len); + size_t i = 0, j; + int ret; + + writel(spmi_cmd, spmi->regs + SPMI_CMD_REG); + + while (i < len) { + j = 0; + spmi_cmd = 0; + while ((j < 4) & (i < len)) + spmi_cmd |= buf[i++] << (j++ * 8); + + writel(spmi_cmd, spmi->regs + SPMI_CMD_REG); + } + + ret = apple_spmi_wait_rx_not_empty(ctrl); + if (ret) + return ret; + + /* Discard */ + readl(spmi->regs + SPMI_RSP_REG); + + return 0; +} + +static int apple_spmi_probe(struct platform_device *pdev) +{ + struct apple_spmi *spmi; + struct spmi_controller *ctrl; + int ret; + + ctrl = devm_spmi_controller_alloc(&pdev->dev, sizeof(*spmi)); + if (IS_ERR(ctrl)) + return -ENOMEM; + + spmi = spmi_controller_get_drvdata(ctrl); + + spmi->regs = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(spmi->regs)) + return PTR_ERR(spmi->regs); + + ctrl->dev.of_node = pdev->dev.of_node; + + ctrl->read_cmd = spmi_read_cmd; + ctrl->write_cmd = spmi_write_cmd; + + ret = devm_spmi_controller_add(&pdev->dev, ctrl); + if (ret) + return dev_err_probe(&pdev->dev, ret, + "spmi_controller_add failed\n"); + + return 0; +} + +static const struct of_device_id apple_spmi_match_table[] = { + { .compatible = "apple,spmi", }, + {} +}; +MODULE_DEVICE_TABLE(of, apple_spmi_match_table); + +static struct platform_driver apple_spmi_driver = { + .probe = apple_spmi_probe, + .driver = { + .name = "apple-spmi", + .of_match_table = apple_spmi_match_table, + }, +}; +module_platform_driver(apple_spmi_driver); + +MODULE_AUTHOR("Jean-Francois Bortolotti "); +MODULE_DESCRIPTION("Apple SoC SPMI driver"); +MODULE_LICENSE("GPL"); -- 2.48.1