From patchwork Mon Dec 7 19:21:03 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sergio Paracuellos X-Patchwork-Id: 339311 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 97DE2C4167B for ; Mon, 7 Dec 2020 19:22:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 60F88238D7 for ; Mon, 7 Dec 2020 19:22:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726441AbgLGTVw (ORCPT ); Mon, 7 Dec 2020 14:21:52 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57578 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725804AbgLGTVw (ORCPT ); Mon, 7 Dec 2020 14:21:52 -0500 Received: from mail-wr1-x443.google.com (mail-wr1-x443.google.com [IPv6:2a00:1450:4864:20::443]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8B004C06179C; Mon, 7 Dec 2020 11:21:11 -0800 (PST) Received: by mail-wr1-x443.google.com with SMTP id k14so13906424wrn.1; Mon, 07 Dec 2020 11:21:11 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=P1iFkHt+7TtGxb8D/KYeMkWqwQly0/lTayfSVKIjyQo=; b=nnUZxFkeOW8MHlbzsKkRwp+V9o+95kstKPqRD4N+OImUxQOqufZJfG74iduN/KnrjG nyNodJljTHvf0vLhUzw3AV1HdHLYAWzDOw/TeLzb+SRzds2mE7twgy4kN/Sb3YDPkP+l BOD6T1rITFuKS8VI2OM3x2CzpnAQfyP+H3ETAXEY3x2Vcsv851NLl8i5S+I2aP0nMsHL Zb/RXzTBRb65rhNBjQcCWuyMQWgLr0ZYsIoBVu7O6XwVvtdEvZPl89Zl/KegbJa1a9cs JKcvDUPyhj9rhb9jWA4ef8wNnXIM8gh2BKf4erUULTGJYF39W7e7ieHp/0TGbgbZEejz pS0g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=P1iFkHt+7TtGxb8D/KYeMkWqwQly0/lTayfSVKIjyQo=; b=JQRwLvNFTH0K0Gdmqfk9yOcRLAFju86W86WBYKaANGSoVmf4JhlP1c2DqbdRVAlUI9 dJeRi1yy5dJauLhYbbvqk6yUZ/BCe85cHqNPW0RMapPsWOBueZ+Q/ltxT+n8MbPVpZbo YAndWvcz5LMzR9M76/C8H6nCHjqSL2Hq3BkimgOdnGbWBWWKTBVt+YwQ9KmY0nDV6O5G roFLOiION+IpZmeSNKr/8QEJS9c4xL6NW5IOjixMzoiWGlui2o1wtgpYDhM0x2598vZb uC5WmfaGuWhTI/x4HiKCDKAxrkkESZWyeyQpgZEtPuJb4WvTPAy5u3spmzh7zOkUgJhB Rrpw== X-Gm-Message-State: AOAM533RS3JtI74YAhSkKLak63fF7VQS3i4gegRcgbZujyZnnVA6crdJ HgCaXX8+Hqmf0VopBtqLoEY= X-Google-Smtp-Source: ABdhPJz6fafIN4t7K2lWMsg4PdtnHK1mMHL5M5wW1LKY0kCEgvKZKKSRXjGUCd7bxsIA3kU5kiD6kA== X-Received: by 2002:a5d:4001:: with SMTP id n1mr21327684wrp.243.1607368870247; Mon, 07 Dec 2020 11:21:10 -0800 (PST) Received: from localhost.localdomain (188.red-81-44-87.dynamicip.rima-tde.net. [81.44.87.188]) by smtp.gmail.com with ESMTPSA id 20sm276978wmk.16.2020.12.07.11.21.09 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Mon, 07 Dec 2020 11:21:09 -0800 (PST) From: Sergio Paracuellos To: linus.walleij@linaro.org Cc: robh+dt@kernel.org, gregkh@linuxfoundation.org, yanaijie@huawei.com, linux-gpio@vger.kernel.org, devicetree@vger.kernel.org, devel@driverdev.osuosl.org Subject: [PATCH 2/3] pinctrl: ralink: add a pinctrl driver for the rt2880 family Date: Mon, 7 Dec 2020 20:21:03 +0100 Message-Id: <20201207192104.6046-3-sergio.paracuellos@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20201207192104.6046-1-sergio.paracuellos@gmail.com> References: <20201207192104.6046-1-sergio.paracuellos@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org These Socs have 1-3 banks of 8-32 gpios. Rather then setting the muxing of each pin individually, these socs have mux groups that when set will effect 1-N pins. Pin groups have a 2, 4 or 8 different muxes. Signed-off-by: Sergio Paracuellos Acked-by: Linus Walleij --- drivers/pinctrl/Kconfig | 6 + drivers/pinctrl/Makefile | 1 + drivers/pinctrl/pinctrl-rt2880.c | 370 +++++++++++++++++++++++++++++++ 3 files changed, 377 insertions(+) create mode 100644 drivers/pinctrl/pinctrl-rt2880.c diff --git a/drivers/pinctrl/Kconfig b/drivers/pinctrl/Kconfig index 815095326e2d..e97970ec1210 100644 --- a/drivers/pinctrl/Kconfig +++ b/drivers/pinctrl/Kconfig @@ -215,6 +215,12 @@ config PINCTRL_ROCKCHIP select MFD_SYSCON select OF_GPIO +config PINCTRL_RT2880 + bool "RT2880 pinctrl driver for RALINK/Mediatek SOCs" + depends on RALINK + select PINMUX + select GENERIC_PINCONF + config PINCTRL_SINGLE tristate "One-register-per-pin type device tree based pinctrl driver" depends on OF diff --git a/drivers/pinctrl/Makefile b/drivers/pinctrl/Makefile index f53933b2ff02..0ebc24dad259 100644 --- a/drivers/pinctrl/Makefile +++ b/drivers/pinctrl/Makefile @@ -45,6 +45,7 @@ obj-$(CONFIG_PINCTRL_STMFX) += pinctrl-stmfx.o obj-$(CONFIG_PINCTRL_ZYNQ) += pinctrl-zynq.o obj-$(CONFIG_PINCTRL_INGENIC) += pinctrl-ingenic.o obj-$(CONFIG_PINCTRL_RK805) += pinctrl-rk805.o +obj-$(CONFIG_PINCTRL_RT2880) += pinctrl-rt2880.o obj-$(CONFIG_PINCTRL_OCELOT) += pinctrl-ocelot.o obj-$(CONFIG_PINCTRL_EQUILIBRIUM) += pinctrl-equilibrium.o diff --git a/drivers/pinctrl/pinctrl-rt2880.c b/drivers/pinctrl/pinctrl-rt2880.c new file mode 100644 index 000000000000..e61dbe186bc9 --- /dev/null +++ b/drivers/pinctrl/pinctrl-rt2880.c @@ -0,0 +1,370 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2013 John Crispin + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include + +#include "core.h" +#include "pinctrl-utils.h" + +#define SYSC_REG_GPIO_MODE 0x60 +#define SYSC_REG_GPIO_MODE2 0x64 + +struct rt2880_priv { + struct device *dev; + + struct pinctrl_pin_desc *pads; + struct pinctrl_desc *desc; + + struct rt2880_pmx_func **func; + int func_count; + + struct rt2880_pmx_group *groups; + const char **group_names; + int group_count; + + u8 *gpio; + int max_pins; +}; + +static int rt2880_get_group_count(struct pinctrl_dev *pctrldev) +{ + struct rt2880_priv *p = pinctrl_dev_get_drvdata(pctrldev); + + return p->group_count; +} + +static const char *rt2880_get_group_name(struct pinctrl_dev *pctrldev, + unsigned int group) +{ + struct rt2880_priv *p = pinctrl_dev_get_drvdata(pctrldev); + + return (group >= p->group_count) ? NULL : p->group_names[group]; +} + +static int rt2880_get_group_pins(struct pinctrl_dev *pctrldev, + unsigned int group, + const unsigned int **pins, + unsigned int *num_pins) +{ + struct rt2880_priv *p = pinctrl_dev_get_drvdata(pctrldev); + + if (group >= p->group_count) + return -EINVAL; + + *pins = p->groups[group].func[0].pins; + *num_pins = p->groups[group].func[0].pin_count; + + return 0; +} + +static const struct pinctrl_ops rt2880_pctrl_ops = { + .get_groups_count = rt2880_get_group_count, + .get_group_name = rt2880_get_group_name, + .get_group_pins = rt2880_get_group_pins, + .dt_node_to_map = pinconf_generic_dt_node_to_map_all, + .dt_free_map = pinconf_generic_dt_free_map, +}; + +static int rt2880_pmx_func_count(struct pinctrl_dev *pctrldev) +{ + struct rt2880_priv *p = pinctrl_dev_get_drvdata(pctrldev); + + return p->func_count; +} + +static const char *rt2880_pmx_func_name(struct pinctrl_dev *pctrldev, + unsigned int func) +{ + struct rt2880_priv *p = pinctrl_dev_get_drvdata(pctrldev); + + return p->func[func]->name; +} + +static int rt2880_pmx_group_get_groups(struct pinctrl_dev *pctrldev, + unsigned int func, + const char * const **groups, + unsigned int * const num_groups) +{ + struct rt2880_priv *p = pinctrl_dev_get_drvdata(pctrldev); + + if (p->func[func]->group_count == 1) + *groups = &p->group_names[p->func[func]->groups[0]]; + else + *groups = p->group_names; + + *num_groups = p->func[func]->group_count; + + return 0; +} + +static int rt2880_pmx_group_enable(struct pinctrl_dev *pctrldev, + unsigned int func, unsigned int group) +{ + struct rt2880_priv *p = pinctrl_dev_get_drvdata(pctrldev); + u32 mode = 0; + u32 reg = SYSC_REG_GPIO_MODE; + int i; + int shift; + + /* dont allow double use */ + if (p->groups[group].enabled) { + dev_err(p->dev, "%s is already enabled\n", + p->groups[group].name); + return -EBUSY; + } + + p->groups[group].enabled = 1; + p->func[func]->enabled = 1; + + shift = p->groups[group].shift; + if (shift >= 32) { + shift -= 32; + reg = SYSC_REG_GPIO_MODE2; + } + mode = rt_sysc_r32(reg); + mode &= ~(p->groups[group].mask << shift); + + /* mark the pins as gpio */ + for (i = 0; i < p->groups[group].func[0].pin_count; i++) + p->gpio[p->groups[group].func[0].pins[i]] = 1; + + /* function 0 is gpio and needs special handling */ + if (func == 0) { + mode |= p->groups[group].gpio << shift; + } else { + for (i = 0; i < p->func[func]->pin_count; i++) + p->gpio[p->func[func]->pins[i]] = 0; + mode |= p->func[func]->value << shift; + } + rt_sysc_w32(mode, reg); + + return 0; +} + +static int rt2880_pmx_group_gpio_request_enable(struct pinctrl_dev *pctrldev, + struct pinctrl_gpio_range *range, + unsigned int pin) +{ + struct rt2880_priv *p = pinctrl_dev_get_drvdata(pctrldev); + + if (!p->gpio[pin]) { + dev_err(p->dev, "pin %d is not set to gpio mux\n", pin); + return -EINVAL; + } + + return 0; +} + +static const struct pinmux_ops rt2880_pmx_group_ops = { + .get_functions_count = rt2880_pmx_func_count, + .get_function_name = rt2880_pmx_func_name, + .get_function_groups = rt2880_pmx_group_get_groups, + .set_mux = rt2880_pmx_group_enable, + .gpio_request_enable = rt2880_pmx_group_gpio_request_enable, +}; + +static struct pinctrl_desc rt2880_pctrl_desc = { + .owner = THIS_MODULE, + .name = "rt2880-pinmux", + .pctlops = &rt2880_pctrl_ops, + .pmxops = &rt2880_pmx_group_ops, +}; + +static struct rt2880_pmx_func gpio_func = { + .name = "gpio", +}; + +static int rt2880_pinmux_index(struct rt2880_priv *p) +{ + struct rt2880_pmx_func **f; + struct rt2880_pmx_group *mux = p->groups; + int i, j, c = 0; + + /* count the mux functions */ + while (mux->name) { + p->group_count++; + mux++; + } + + /* allocate the group names array needed by the gpio function */ + p->group_names = devm_kcalloc(p->dev, p->group_count, + sizeof(char *), GFP_KERNEL); + if (!p->group_names) + return -1; + + for (i = 0; i < p->group_count; i++) { + p->group_names[i] = p->groups[i].name; + p->func_count += p->groups[i].func_count; + } + + /* we have a dummy function[0] for gpio */ + p->func_count++; + + /* allocate our function and group mapping index buffers */ + f = p->func = devm_kcalloc(p->dev, + p->func_count, + sizeof(*p->func), + GFP_KERNEL); + gpio_func.groups = devm_kcalloc(p->dev, p->group_count, sizeof(int), + GFP_KERNEL); + if (!f || !gpio_func.groups) + return -1; + + /* add a backpointer to the function so it knows its group */ + gpio_func.group_count = p->group_count; + for (i = 0; i < gpio_func.group_count; i++) + gpio_func.groups[i] = i; + + f[c] = &gpio_func; + c++; + + /* add remaining functions */ + for (i = 0; i < p->group_count; i++) { + for (j = 0; j < p->groups[i].func_count; j++) { + f[c] = &p->groups[i].func[j]; + f[c]->groups = devm_kzalloc(p->dev, sizeof(int), + GFP_KERNEL); + f[c]->groups[0] = i; + f[c]->group_count = 1; + c++; + } + } + return 0; +} + +static int rt2880_pinmux_pins(struct rt2880_priv *p) +{ + int i, j; + + /* + * loop over the functions and initialize the pins array. + * also work out the highest pin used. + */ + for (i = 0; i < p->func_count; i++) { + int pin; + + if (!p->func[i]->pin_count) + continue; + + p->func[i]->pins = devm_kcalloc(p->dev, + p->func[i]->pin_count, + sizeof(int), + GFP_KERNEL); + for (j = 0; j < p->func[i]->pin_count; j++) + p->func[i]->pins[j] = p->func[i]->pin_first + j; + + pin = p->func[i]->pin_first + p->func[i]->pin_count; + if (pin > p->max_pins) + p->max_pins = pin; + } + + /* the buffer that tells us which pins are gpio */ + p->gpio = devm_kcalloc(p->dev, p->max_pins, sizeof(u8), GFP_KERNEL); + /* the pads needed to tell pinctrl about our pins */ + p->pads = devm_kcalloc(p->dev, p->max_pins, + sizeof(struct pinctrl_pin_desc), GFP_KERNEL); + if (!p->pads || !p->gpio) { + dev_err(p->dev, "Failed to allocate gpio data\n"); + return -ENOMEM; + } + + memset(p->gpio, 1, sizeof(u8) * p->max_pins); + for (i = 0; i < p->func_count; i++) { + if (!p->func[i]->pin_count) + continue; + + for (j = 0; j < p->func[i]->pin_count; j++) + p->gpio[p->func[i]->pins[j]] = 0; + } + + /* pin 0 is always a gpio */ + p->gpio[0] = 1; + + /* set the pads */ + for (i = 0; i < p->max_pins; i++) { + /* strlen("ioXY") + 1 = 5 */ + char *name = devm_kzalloc(p->dev, 5, GFP_KERNEL); + + if (!name) + return -ENOMEM; + snprintf(name, 5, "io%d", i); + p->pads[i].number = i; + p->pads[i].name = name; + } + p->desc->pins = p->pads; + p->desc->npins = p->max_pins; + + return 0; +} + +static int rt2880_pinmux_probe(struct platform_device *pdev) +{ + struct rt2880_priv *p; + struct pinctrl_dev *dev; + + if (!rt2880_pinmux_data) + return -ENOTSUPP; + + /* setup the private data */ + p = devm_kzalloc(&pdev->dev, sizeof(struct rt2880_priv), GFP_KERNEL); + if (!p) + return -ENOMEM; + + p->dev = &pdev->dev; + p->desc = &rt2880_pctrl_desc; + p->groups = rt2880_pinmux_data; + platform_set_drvdata(pdev, p); + + /* init the device */ + if (rt2880_pinmux_index(p)) { + dev_err(&pdev->dev, "failed to load index\n"); + return -EINVAL; + } + if (rt2880_pinmux_pins(p)) { + dev_err(&pdev->dev, "failed to load pins\n"); + return -EINVAL; + } + dev = pinctrl_register(p->desc, &pdev->dev, p); + if (IS_ERR(dev)) + return PTR_ERR(dev); + + return 0; +} + +static const struct of_device_id rt2880_pinmux_match[] = { + { .compatible = "ralink,rt2880-pinmux" }, + {}, +}; +MODULE_DEVICE_TABLE(of, rt2880_pinmux_match); + +static struct platform_driver rt2880_pinmux_driver = { + .probe = rt2880_pinmux_probe, + .driver = { + .name = "rt2880-pinmux", + .of_match_table = rt2880_pinmux_match, + }, +}; + +int __init rt2880_pinmux_init(void) +{ + return platform_driver_register(&rt2880_pinmux_driver); +} + +core_initcall_sync(rt2880_pinmux_init);