From patchwork Fri Dec 23 09:00:49 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Binbin Zhou X-Patchwork-Id: 636460 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 2BAB8C3DA7A for ; Fri, 23 Dec 2022 09:00:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235035AbiLWJAi (ORCPT ); Fri, 23 Dec 2022 04:00:38 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41706 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229658AbiLWJAh (ORCPT ); Fri, 23 Dec 2022 04:00:37 -0500 Received: from loongson.cn (mail.loongson.cn [114.242.206.163]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 15D6E36C49; Fri, 23 Dec 2022 01:00:34 -0800 (PST) Received: from loongson.cn (unknown [112.20.108.31]) by gateway (Coremail) with SMTP id _____8CxrusybqVjLQ0IAA--.18354S3; Fri, 23 Dec 2022 17:00:34 +0800 (CST) Received: from localhost.localdomain (unknown [112.20.108.31]) by localhost.localdomain (Coremail) with SMTP id AQAAf8Bxzr4ubqVjuz0JAA--.14684S3; Fri, 23 Dec 2022 17:00:33 +0800 (CST) From: Binbin Zhou To: Wolfram Sang , Wolfram Sang , Andy Shevchenko , Mika Westerberg , linux-i2c@vger.kernel.org Cc: loongarch@lists.linux.dev, devicetree@vger.kernel.org, Huacai Chen , WANG Xuerui , Andy Shevchenko , Arnd Bergmann , Rob Herring , Krzysztof Kozlowski , Jianmin Lv , Binbin Zhou Subject: [PATCH V8 1/4] i2c: gpio: Add support on ACPI-based system Date: Fri, 23 Dec 2022 17:00:49 +0800 Message-Id: X-Mailer: git-send-email 2.31.1 In-Reply-To: References: MIME-Version: 1.0 X-CM-TRANSID: AQAAf8Bxzr4ubqVjuz0JAA--.14684S3 X-CM-SenderInfo: p2kr3uplqex0o6or00hjvr0hdfq/ X-Coremail-Antispam: 1Uk129KBjvJXoWxZFWxXry8AFyxXr48ZFWDurg_yoW5Zr13pF WY9FZxtFWjgF42grnrXw1kZw1Skwn2q3yIgw47G3sY9w4qqrn8XFy8tFyI9F15ZFW8Gw13 tw1UtFW3CFsrZaUanT9S1TB71UUUUjDqnTZGkaVYY2UrUUUUj1kv1TuYvTs0mT0YCTnIWj qI5I8CrVACY4xI64kE6c02F40Ex7xfYxn0WfASr-VFAUDa7-sFnT9fnUUIcSsGvfJTRUUU bfAYFVCjjxCrM7AC8VAFwI0_Jr0_Gr1l1xkIjI8I6I8E6xAIw20EY4v20xvaj40_Wr0E3s 1l1IIY67AEw4v_Jrv_JF1l8cAvFVAK0II2c7xJM28CjxkF64kEwVA0rcxSw2x7M28EF7xv wVC0I7IYx2IY67AKxVW7JVWDJwA2z4x0Y4vE2Ix0cI8IcVCY1x0267AKxVW8JVWxJwA2z4 x0Y4vEx4A2jsIE14v26F4UJVW0owA2z4x0Y4vEx4A2jsIEc7CjxVAFwI0_Cr1j6rxdM2kK e7AKxVWUAVWUtwAS0I0E0xvYzxvE52x082IY62kv0487Mc804VCY07AIYIkI8VC2zVCFFI 0UMc02F40EFcxC0VAKzVAqx4xG6I80ewAv7VC0I7IYx2IY67AKxVWUtVWrXwAv7VC2z280 aVAFwI0_Gr0_Cr1lOx8S6xCaFVCjc4AY6r1j6r4UM4x0Y48IcxkI7VAKI48JMxkF7I0En4 kS14v26r1q6r43MxAIw28IcxkI7VAKI48JMxC20s026xCaFVCjc4AY6r1j6r4UMxCIbckI 1I0E14v26r126r1DMI8I3I0E5I8CrVAFwI0_Jr0_Jr4lx2IqxVCjr7xvwVAFwI0_JrI_Jr Wlx4CE17CEb7AF67AKxVWUtVW8ZwCIc40Y0x0EwIxGrwCI42IY6xIIjxv20xvE14v26r4j 6ryUMIIF0xvE2Ix0cI8IcVCY1x0267AKxVW8JVWxJwCI42IY6xAIw20EY4v20xvaj40_Jr 0_JF4lIxAIcVC2z280aVAFwI0_Gr0_Cr1lIxAIcVC2z280aVCY1x0267AKxVW8JVW8JrUv cSsGvfC2KfnxnUUI43ZEXa7IU8XTm3UUUUU== Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org Add support for the ACPI-based device registration, so that the driver can be also enabled through ACPI table. Reviewed-by: Andy Shevchenko Signed-off-by: Binbin Zhou --- drivers/i2c/busses/i2c-gpio.c | 28 ++++++++++++++++++---------- 1 file changed, 18 insertions(+), 10 deletions(-) diff --git a/drivers/i2c/busses/i2c-gpio.c b/drivers/i2c/busses/i2c-gpio.c index 0e4385a9bcf7..680936234ef8 100644 --- a/drivers/i2c/busses/i2c-gpio.c +++ b/drivers/i2c/busses/i2c-gpio.c @@ -13,9 +13,9 @@ #include #include #include -#include #include #include +#include #include struct i2c_gpio_private_data { @@ -300,22 +300,23 @@ static inline void i2c_gpio_fault_injector_init(struct platform_device *pdev) {} static inline void i2c_gpio_fault_injector_exit(struct platform_device *pdev) {} #endif /* CONFIG_I2C_GPIO_FAULT_INJECTOR*/ -static void of_i2c_gpio_get_props(struct device_node *np, - struct i2c_gpio_platform_data *pdata) +/* Get i2c-gpio properties from DT or ACPI table */ +static void i2c_gpio_get_properties(struct device *dev, + struct i2c_gpio_platform_data *pdata) { u32 reg; - of_property_read_u32(np, "i2c-gpio,delay-us", &pdata->udelay); + device_property_read_u32(dev, "i2c-gpio,delay-us", &pdata->udelay); - if (!of_property_read_u32(np, "i2c-gpio,timeout-ms", ®)) + if (!device_property_read_u32(dev, "i2c-gpio,timeout-ms", ®)) pdata->timeout = msecs_to_jiffies(reg); pdata->sda_is_open_drain = - of_property_read_bool(np, "i2c-gpio,sda-open-drain"); + device_property_read_bool(dev, "i2c-gpio,sda-open-drain"); pdata->scl_is_open_drain = - of_property_read_bool(np, "i2c-gpio,scl-open-drain"); + device_property_read_bool(dev, "i2c-gpio,scl-open-drain"); pdata->scl_is_output_only = - of_property_read_bool(np, "i2c-gpio,scl-output-only"); + device_property_read_bool(dev, "i2c-gpio,scl-output-only"); } static struct gpio_desc *i2c_gpio_get_desc(struct device *dev, @@ -373,8 +374,8 @@ static int i2c_gpio_probe(struct platform_device *pdev) bit_data = &priv->bit_data; pdata = &priv->pdata; - if (np) { - of_i2c_gpio_get_props(np, pdata); + if (dev_fwnode(dev)) { + i2c_gpio_get_properties(dev, pdata); } else { /* * If all platform data settings are zero it is OK @@ -489,10 +490,17 @@ static const struct of_device_id i2c_gpio_dt_ids[] = { MODULE_DEVICE_TABLE(of, i2c_gpio_dt_ids); +static const struct acpi_device_id i2c_gpio_acpi_match[] = { + { "LOON0005" }, /* LoongArch */ + { } +}; +MODULE_DEVICE_TABLE(acpi, i2c_gpio_acpi_match); + static struct platform_driver i2c_gpio_driver = { .driver = { .name = "i2c-gpio", .of_match_table = i2c_gpio_dt_ids, + .acpi_match_table = i2c_gpio_acpi_match, }, .probe = i2c_gpio_probe, .remove = i2c_gpio_remove, From patchwork Fri Dec 23 09:00:50 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Binbin Zhou X-Patchwork-Id: 636773 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 75697C3DA6E for ; Fri, 23 Dec 2022 09:00:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235501AbiLWJAk (ORCPT ); Fri, 23 Dec 2022 04:00:40 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41712 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235474AbiLWJAi (ORCPT ); Fri, 23 Dec 2022 04:00:38 -0500 Received: from loongson.cn (mail.loongson.cn [114.242.206.163]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id EB0642A26B; Fri, 23 Dec 2022 01:00:36 -0800 (PST) Received: from loongson.cn (unknown [112.20.108.31]) by gateway (Coremail) with SMTP id _____8AxRPA0bqVjNQ0IAA--.18393S3; Fri, 23 Dec 2022 17:00:36 +0800 (CST) Received: from localhost.localdomain (unknown [112.20.108.31]) by localhost.localdomain (Coremail) with SMTP id AQAAf8Bxzr4ubqVjuz0JAA--.14684S4; Fri, 23 Dec 2022 17:00:34 +0800 (CST) From: Binbin Zhou To: Wolfram Sang , Wolfram Sang , Andy Shevchenko , Mika Westerberg , linux-i2c@vger.kernel.org Cc: loongarch@lists.linux.dev, devicetree@vger.kernel.org, Huacai Chen , WANG Xuerui , Andy Shevchenko , Arnd Bergmann , Rob Herring , Krzysztof Kozlowski , Jianmin Lv , Binbin Zhou , Krzysztof Kozlowski Subject: [PATCH V8 2/4] dt-bindings: i2c: add Loongson LS2X I2C controller Date: Fri, 23 Dec 2022 17:00:50 +0800 Message-Id: X-Mailer: git-send-email 2.31.1 In-Reply-To: References: MIME-Version: 1.0 X-CM-TRANSID: AQAAf8Bxzr4ubqVjuz0JAA--.14684S4 X-CM-SenderInfo: p2kr3uplqex0o6or00hjvr0hdfq/ X-Coremail-Antispam: 1Uk129KBjvJXoW7Ww1fGw1fAFW8XFW8GrWktFb_yoW8Arykp3 ZrCasrGr40vF17u398KFy8CF15Zwn3A3ZrWFZFyw1UKFWDG3WYvw1akrn8Z3WfWry0qFW7 XFZ2gr4jkas7Ar7anT9S1TB71UUUUjDqnTZGkaVYY2UrUUUUj1kv1TuYvTs0mT0YCTnIWj qI5I8CrVACY4xI64kE6c02F40Ex7xfYxn0WfASr-VFAUDa7-sFnT9fnUUIcSsGvfJTRUUU bS8YFVCjjxCrM7AC8VAFwI0_Jr0_Gr1l1xkIjI8I6I8E6xAIw20EY4v20xvaj40_Wr0E3s 1l1IIY67AEw4v_Jrv_JF1l8cAvFVAK0II2c7xJM28CjxkF64kEwVA0rcxSw2x7M28EF7xv wVC0I7IYx2IY67AKxVW7JVWDJwA2z4x0Y4vE2Ix0cI8IcVCY1x0267AKxVWxJVW8Jr1l84 ACjcxK6I8E87Iv67AKxVWxJr0_GcWl84ACjcxK6I8E87Iv6xkF7I0E14v26F4UJVW0owAa w2AFwI0_JF0_Jw1le2I262IYc4CY6c8Ij28IcVAaY2xG8wAqjxCEc2xF0cIa020Ex4CE44 I27wAqx4xG64xvF2IEw4CE5I8CrVC2j2WlYx0E2Ix0cI8IcVAFwI0_Jw0_WrylYx0Ex4A2 jsIE14v26r4j6F4UMcvjeVCFs4IE7xkEbVWUJVW8JwACjcxG0xvY0x0EwIxGrwCY1x0262 kKe7AKxVWUtVW8ZwCF04k20xvY0x0EwIxGrwCFx2IqxVCFs4IE7xkEbVWUJVW8JwCFI7km 07C267AKxVWUAVWUtwC20s026c02F40E14v26r1j6r18MI8I3I0E7480Y4vE14v26r106r 1rMI8E67AF67kF1VAFwI0_GFv_WrylIxkGc2Ij64vIr41lIxAIcVC0I7IYx2IY67AKxVW5 JVW7JwCI42IY6xIIjxv20xvEc7CjxVAFwI0_Gr0_Cr1lIxAIcVCF04k26cxKx2IYs7xG6r 1j6r1xMIIF0xvEx4A2jsIE14v26r4j6F4UMIIF0xvEx4A2jsIEc7CjxVAFwI0_Gr0_Gr1U YxBIdaVFxhVjvjDU0xZFpf9x07jr9NsUUUUU= Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org Add Loongson LS2X I2C controller binding with DT schema format using json-schema. Reviewed-by: Krzysztof Kozlowski Signed-off-by: Binbin Zhou --- .../bindings/i2c/loongson,ls2x-i2c.yaml | 51 +++++++++++++++++++ 1 file changed, 51 insertions(+) create mode 100644 Documentation/devicetree/bindings/i2c/loongson,ls2x-i2c.yaml diff --git a/Documentation/devicetree/bindings/i2c/loongson,ls2x-i2c.yaml b/Documentation/devicetree/bindings/i2c/loongson,ls2x-i2c.yaml new file mode 100644 index 000000000000..67882ec6e06a --- /dev/null +++ b/Documentation/devicetree/bindings/i2c/loongson,ls2x-i2c.yaml @@ -0,0 +1,51 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/i2c/loongson,ls2x-i2c.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Loongson LS2X I2C Controller + +maintainers: + - Binbin Zhou + +allOf: + - $ref: /schemas/i2c/i2c-controller.yaml# + +properties: + compatible: + enum: + - loongson,ls2k-i2c + - loongson,ls7a-i2c + + reg: + maxItems: 1 + + interrupts: + maxItems: 1 + +required: + - compatible + - reg + - interrupts + +unevaluatedProperties: false + +examples: + - | + #include + + i2c0: i2c@1fe21000 { + compatible = "loongson,ls2k-i2c"; + reg = <0x1fe21000 0x8>; + interrupt-parent = <&extioiic>; + interrupts = <22 IRQ_TYPE_LEVEL_LOW>; + #address-cells = <1>; + #size-cells = <0>; + + eeprom@57 { + compatible = "atmel,24c16"; + reg = <0x57>; + pagesize = <16>; + }; + }; From patchwork Fri Dec 23 09:00:51 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Binbin Zhou X-Patchwork-Id: 636459 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 59351C41535 for ; Fri, 23 Dec 2022 09:00:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235712AbiLWJAm (ORCPT ); Fri, 23 Dec 2022 04:00:42 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41728 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235673AbiLWJAk (ORCPT ); Fri, 23 Dec 2022 04:00:40 -0500 Received: from loongson.cn (mail.loongson.cn [114.242.206.163]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 5626E357B4; Fri, 23 Dec 2022 01:00:38 -0800 (PST) Received: from loongson.cn (unknown [112.20.108.31]) by gateway (Coremail) with SMTP id _____8Cx6+o1bqVjPg0IAA--.18225S3; Fri, 23 Dec 2022 17:00:37 +0800 (CST) Received: from localhost.localdomain (unknown [112.20.108.31]) by localhost.localdomain (Coremail) with SMTP id AQAAf8Bxzr4ubqVjuz0JAA--.14684S5; Fri, 23 Dec 2022 17:00:36 +0800 (CST) From: Binbin Zhou To: Wolfram Sang , Wolfram Sang , Andy Shevchenko , Mika Westerberg , linux-i2c@vger.kernel.org Cc: loongarch@lists.linux.dev, devicetree@vger.kernel.org, Huacai Chen , WANG Xuerui , Andy Shevchenko , Arnd Bergmann , Rob Herring , Krzysztof Kozlowski , Jianmin Lv , Binbin Zhou Subject: [PATCH V8 3/4] i2c: ls2x: Add driver for Loongson-2K/LS7A I2C controller Date: Fri, 23 Dec 2022 17:00:51 +0800 Message-Id: <9d3e4997519fd9ecebae6fd241148cc22d3fe04f.1671688961.git.zhoubinbin@loongson.cn> X-Mailer: git-send-email 2.31.1 In-Reply-To: References: MIME-Version: 1.0 X-CM-TRANSID: AQAAf8Bxzr4ubqVjuz0JAA--.14684S5 X-CM-SenderInfo: p2kr3uplqex0o6or00hjvr0hdfq/ X-Coremail-Antispam: 1Uk129KBjvJXoWfGrW5uF15ur1UKr1DGw4DArb_yoWktryxpF 45C345Gr4UXr1Sgrs7J3Z09F13W393XFyktFWfXwsxZrs2yr1DZws7tryFyF1kGFykWrW3 JayDCF45CFZFqFUanT9S1TB71UUUUjDqnTZGkaVYY2UrUUUUj1kv1TuYvTs0mT0YCTnIWj qI5I8CrVACY4xI64kE6c02F40Ex7xfYxn0WfASr-VFAUDa7-sFnT9fnUUIcSsGvfJTRUUU bS8YFVCjjxCrM7AC8VAFwI0_Jr0_Gr1l1xkIjI8I6I8E6xAIw20EY4v20xvaj40_Wr0E3s 1l1IIY67AEw4v_Jrv_JF1l8cAvFVAK0II2c7xJM28CjxkF64kEwVA0rcxSw2x7M28EF7xv wVC0I7IYx2IY67AKxVW7JVWDJwA2z4x0Y4vE2Ix0cI8IcVCY1x0267AKxVWxJVW8Jr1l84 ACjcxK6I8E87Iv67AKxVWxJr0_GcWl84ACjcxK6I8E87Iv6xkF7I0E14v26F4UJVW0owAa w2AFwI0_JF0_Jw1le2I262IYc4CY6c8Ij28IcVAaY2xG8wAqjxCEc2xF0cIa020Ex4CE44 I27wAqx4xG64xvF2IEw4CE5I8CrVC2j2WlYx0E2Ix0cI8IcVAFwI0_Jw0_WrylYx0Ex4A2 jsIE14v26r4j6F4UMcvjeVCFs4IE7xkEbVWUJVW8JwACjcxG0xvY0x0EwIxGrwCY1x0262 kKe7AKxVWUtVW8ZwCF04k20xvY0x0EwIxGrwCFx2IqxVCFs4IE7xkEbVWUJVW8JwCFI7km 07C267AKxVWUAVWUtwC20s026c02F40E14v26r1j6r18MI8I3I0E7480Y4vE14v26r106r 1rMI8E67AF67kF1VAFwI0_Jw0_GFylIxkGc2Ij64vIr41lIxAIcVC0I7IYx2IY67AKxVW5 JVW7JwCI42IY6xIIjxv20xvEc7CjxVAFwI0_Gr0_Cr1lIxAIcVCF04k26cxKx2IYs7xG6r 1j6r1xMIIF0xvEx4A2jsIE14v26r4j6F4UMIIF0xvEx4A2jsIEc7CjxVAFwI0_Gr0_Gr1U YxBIdaVFxhVjvjDU0xZFpf9x07jr9NsUUUUU= Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org This I2C module is integrated into the Loongson-2K SoCs and Loongson LS7A bridge chip. Signed-off-by: Binbin Zhou --- drivers/i2c/busses/Kconfig | 11 + drivers/i2c/busses/Makefile | 1 + drivers/i2c/busses/i2c-ls2x.c | 366 ++++++++++++++++++++++++++++++++++ 3 files changed, 378 insertions(+) create mode 100644 drivers/i2c/busses/i2c-ls2x.c diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig index e50f9603d189..d80c938142f5 100644 --- a/drivers/i2c/busses/Kconfig +++ b/drivers/i2c/busses/Kconfig @@ -761,6 +761,17 @@ config I2C_LPC2K This driver can also be built as a module. If so, the module will be called i2c-lpc2k. +config I2C_LS2X + tristate "Loongson LS2X I2C adapter" + depends on MACH_LOONGSON64 || COMPILE_TEST + help + If you say yes to this option, support will be included for the + I2C interface on the Loongson-2K SoCs and Loongson LS7A bridge + chip. + + This driver can also be built as a module. If so, the module + will be called i2c-ls2x. + config I2C_MLXBF tristate "Mellanox BlueField I2C controller" depends on MELLANOX_PLATFORM && ARM64 diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile index e73cdb1d2b5a..0584fe160824 100644 --- a/drivers/i2c/busses/Makefile +++ b/drivers/i2c/busses/Makefile @@ -77,6 +77,7 @@ obj-$(CONFIG_I2C_IOP3XX) += i2c-iop3xx.o obj-$(CONFIG_I2C_JZ4780) += i2c-jz4780.o obj-$(CONFIG_I2C_KEMPLD) += i2c-kempld.o obj-$(CONFIG_I2C_LPC2K) += i2c-lpc2k.o +obj-$(CONFIG_I2C_LS2X) += i2c-ls2x.o obj-$(CONFIG_I2C_MESON) += i2c-meson.o obj-$(CONFIG_I2C_MICROCHIP_CORE) += i2c-microchip-corei2c.o obj-$(CONFIG_I2C_MPC) += i2c-mpc.o diff --git a/drivers/i2c/busses/i2c-ls2x.c b/drivers/i2c/busses/i2c-ls2x.c new file mode 100644 index 000000000000..665faa009c7c --- /dev/null +++ b/drivers/i2c/busses/i2c-ls2x.c @@ -0,0 +1,366 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Loongson-2K/Loongson LS7A I2C master mode driver + * + * Copyright (C) 2013 Loongson Technology Corporation Limited. + * Copyright (C) 2014-2017 Lemote, Inc. + * Copyright (C) 2018-2022 Loongson Technology Corporation Limited. + * + * Originally written by liushaozong + * Rewritten for mainline by Binbin Zhou + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +/* I2C Registers */ +#define I2C_LS2X_PRER 0x0 /* Freq Division Register(16 bits) */ +#define I2C_LS2X_CTR 0x2 /* Control Register */ +#define I2C_LS2X_TXR 0x3 /* Transport Data Register */ +#define I2C_LS2X_RXR 0x3 /* Receive Data Register */ +#define I2C_LS2X_CR 0x4 /* Command Control Register */ +#define I2C_LS2X_SR 0x4 /* State Register */ + +/* Command Control Register Bit */ +#define LS2X_CR_START BIT(7) /* Start signal */ +#define LS2X_CR_STOP BIT(6) /* Stop signal */ +#define LS2X_CR_READ BIT(5) /* Read signal */ +#define LS2X_CR_WRITE BIT(4) /* Write signal */ +#define LS2X_CR_ACK BIT(3) /* Response signal */ +#define LS2X_CR_IACK BIT(0) /* Interrupt response signal */ + +/* State Register Bit */ +#define LS2X_SR_NOACK BIT(7) /* Receive NACK */ +#define LS2X_SR_BUSY BIT(6) /* Bus busy state */ +#define LS2X_SR_AL BIT(5) /* Arbitration lost */ +#define LS2X_SR_TIP BIT(1) /* Transmission state */ +#define LS2X_SR_IF BIT(0) /* Interrupt flag */ + +/* Control Register Bit */ +#define LS2X_CTR_EN BIT(7) /* 0: I2c frequency setting 1: Normal */ +#define LS2X_CTR_IEN BIT(6) /* Enable i2c interrupt */ +#define LS2X_CTR_MST BIT(5) /* 0: Slave mode 1: Master mode */ +#define CTR_FREQ_MASK GENMASK(7, 6) +#define CTR_READY_MASK GENMASK(7, 5) + +/* The PCLK frequency from LPB */ +#define LS2X_I2C_PCLK_FREQ (50 * HZ_PER_MHZ) + +/* The default bus frequency, which is an empirical value */ +#define LS2X_I2C_FREQ_STD (33 * HZ_PER_KHZ) + +struct ls2x_i2c_priv { + struct i2c_adapter adapter; + void __iomem *base; + struct i2c_timings i2c_t; + struct completion cmd_complete; +}; + +/* + * Interrupt service routine. + * This gets called whenever an I2C interrupt occurs. + */ +static irqreturn_t ls2x_i2c_isr(int this_irq, void *dev_id) +{ + struct ls2x_i2c_priv *priv = dev_id; + + if (!(readb(priv->base + I2C_LS2X_SR) & LS2X_SR_IF)) + return IRQ_NONE; + + writeb(LS2X_CR_IACK, priv->base + I2C_LS2X_CR); + complete(&priv->cmd_complete); + return IRQ_HANDLED; +} + +/* + * The ls2x i2c controller supports standard mode and fast mode, so the + * maximum bus frequency is '400kHz'. + * The bus frequency is set to the empirical value of '33KHz' by default, + * but it can also be taken from ACPI or FDT for compatibility with more + * devices. + */ +static void ls2x_i2c_adjust_bus_speed(struct ls2x_i2c_priv *priv) +{ + struct i2c_timings *t = &priv->i2c_t; + struct device *dev = priv->adapter.dev.parent; + u32 acpi_speed = i2c_acpi_find_bus_speed(dev); + + i2c_parse_fw_timings(dev, t, false); + + if (acpi_speed || t->bus_freq_hz) + t->bus_freq_hz = max(t->bus_freq_hz, acpi_speed); + else + t->bus_freq_hz = LS2X_I2C_FREQ_STD; + + /* Calculate and set i2c frequency */ + writew(LS2X_I2C_PCLK_FREQ / (5 * t->bus_freq_hz) - 1, + priv->base + I2C_LS2X_PRER); +} + +static void ls2x_i2c_init(struct ls2x_i2c_priv *priv) +{ + /* Set i2c frequency setting mode and disable interrupts */ + writeb(readb(priv->base + I2C_LS2X_CTR) & ~CTR_FREQ_MASK, + priv->base + I2C_LS2X_CTR); + + ls2x_i2c_adjust_bus_speed(priv); + + /* Set i2c normal operating mode and enable interrupts */ + writeb(readb(priv->base + I2C_LS2X_CTR) | CTR_READY_MASK, + priv->base + I2C_LS2X_CTR); +} + +static int ls2x_i2c_xfer_byte(struct ls2x_i2c_priv *priv, u8 txdata, u8 *rxdatap) +{ + u8 rxdata; + unsigned long time_left; + + writeb(txdata, priv->base + I2C_LS2X_CR); + + time_left = wait_for_completion_timeout(&priv->cmd_complete, + priv->adapter.timeout); + if (!time_left) + return -ETIMEDOUT; + + rxdata = readb(priv->base + I2C_LS2X_SR); + if (rxdatap) + *rxdatap = rxdata; + + return 0; +} + +static int ls2x_i2c_send_byte(struct ls2x_i2c_priv *priv, u8 txdata) +{ + int ret; + u8 rxdata; + + ret = ls2x_i2c_xfer_byte(priv, txdata, &rxdata); + if (ret) + return ret; + + if (rxdata & LS2X_SR_AL) + return -EAGAIN; + + if (rxdata & LS2X_SR_NOACK) + return -ENXIO; + + return 0; +} + +static int ls2x_i2c_stop(struct ls2x_i2c_priv *priv) +{ + u8 value; + + writeb(LS2X_CR_STOP, priv->base + I2C_LS2X_CR); + return readb_poll_timeout(priv->base + I2C_LS2X_SR, value, + !(value & LS2X_SR_BUSY), 100, + jiffies_to_usecs(priv->adapter.timeout)); +} + +static int ls2x_i2c_start(struct ls2x_i2c_priv *priv, struct i2c_msg *msgs) +{ + reinit_completion(&priv->cmd_complete); + + writeb(i2c_8bit_addr_from_msg(msgs), priv->base + I2C_LS2X_TXR); + return ls2x_i2c_send_byte(priv, LS2X_CR_START | LS2X_CR_WRITE); +} + +static int ls2x_i2c_rx(struct ls2x_i2c_priv *priv, u8 *buf, u16 len) +{ + int ret; + u8 rxdata; + + while (len--) { + ret = ls2x_i2c_xfer_byte(priv, + LS2X_CR_READ | (len ? 0 : LS2X_CR_ACK), + &rxdata); + if (ret) + return ret; + + *buf++ = readb(priv->base + I2C_LS2X_RXR); + } + + return 0; +} + +static int ls2x_i2c_tx(struct ls2x_i2c_priv *priv, u8 *buf, u16 len) +{ + int ret; + + while (len--) { + writeb(*buf++, priv->base + I2C_LS2X_TXR); + + ret = ls2x_i2c_send_byte(priv, LS2X_CR_WRITE); + if (ret) + return ret; + } + + return 0; +} + +static int ls2x_i2c_xfer_one(struct ls2x_i2c_priv *priv, + struct i2c_msg *msg, bool stop) +{ + int ret; + bool is_read = msg->flags & I2C_M_RD; + + /* Contains steps to send start condition and address */ + ret = ls2x_i2c_start(priv, msg); + if (!ret) { + if (is_read) + ret = ls2x_i2c_rx(priv, msg->buf, msg->len); + else + ret = ls2x_i2c_tx(priv, msg->buf, msg->len); + + if (!ret && stop) + ret = ls2x_i2c_stop(priv); + } + + if (ret == -ENXIO) + ls2x_i2c_stop(priv); + else if (ret < 0) + ls2x_i2c_init(priv); + + return ret; +} + +static int ls2x_i2c_master_xfer(struct i2c_adapter *adap, + struct i2c_msg *msgs, int num) +{ + int ret; + struct i2c_msg *msg, *emsg = msgs + num; + struct ls2x_i2c_priv *priv = i2c_get_adapdata(adap); + + for (msg = msgs; msg < emsg; msg++) { + ret = ls2x_i2c_xfer_one(priv, msg, msg == emsg - 1); + if (ret) + return ret; + } + + return num; +} + +static unsigned int ls2x_i2c_func(struct i2c_adapter *adap) +{ + return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL; +} + +static const struct i2c_algorithm ls2x_i2c_algo = { + .master_xfer = ls2x_i2c_master_xfer, + .functionality = ls2x_i2c_func, +}; + +static int ls2x_i2c_probe(struct platform_device *pdev) +{ + int ret, irq; + struct i2c_adapter *adap; + struct ls2x_i2c_priv *priv; + struct device *dev = &pdev->dev; + + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + /* Map hardware registers */ + priv->base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(priv->base)) + return PTR_ERR(priv->base); + + irq = platform_get_irq(pdev, 0); + if (irq < 0) + return irq; + + /* Add the i2c adapter */ + adap = &priv->adapter; + adap->nr = pdev->id; + adap->owner = THIS_MODULE; + adap->retries = 5; + adap->algo = &ls2x_i2c_algo; + adap->dev.parent = dev; + device_set_node(&adap->dev, dev_fwnode(dev)); + i2c_set_adapdata(adap, priv); + strscpy(adap->name, pdev->name, sizeof(adap->name)); + init_completion(&priv->cmd_complete); + platform_set_drvdata(pdev, priv); + + ls2x_i2c_init(priv); + + ret = devm_request_irq(dev, irq, ls2x_i2c_isr, IRQF_SHARED, "ls2x-i2c", + priv); + if (ret < 0) + return dev_err_probe(dev, ret, "Unable to request irq %d\n", irq); + + return devm_i2c_add_adapter(dev, adap); +} + +static int ls2x_i2c_suspend(struct device *dev) +{ + struct ls2x_i2c_priv *priv = dev_get_drvdata(dev); + + /* Disable interrupts */ + writeb(readb(priv->base + I2C_LS2X_CTR) & ~LS2X_CTR_IEN, + priv->base + I2C_LS2X_CTR); + + return 0; +} + +static int ls2x_i2c_resume(struct device *dev) +{ + ls2x_i2c_init(dev_get_drvdata(dev)); + return 0; +} + +static DEFINE_RUNTIME_DEV_PM_OPS(ls2x_i2c_pm_ops, + ls2x_i2c_suspend, ls2x_i2c_resume, NULL); + +static const struct of_device_id ls2x_i2c_id_table[] = { + { .compatible = "loongson,ls2k-i2c" }, + { .compatible = "loongson,ls7a-i2c" }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, ls2x_i2c_id_table); + +static const struct acpi_device_id ls2x_i2c_acpi_match[] = { + { "LOON0004" }, /* Loongson LS7A */ + { } +}; +MODULE_DEVICE_TABLE(acpi, ls2x_i2c_acpi_match); + +static struct platform_driver ls2x_i2c_driver = { + .probe = ls2x_i2c_probe, + .driver = { + .name = "ls2x-i2c", + .pm = pm_sleep_ptr(&ls2x_i2c_pm_ops), + .of_match_table = ls2x_i2c_id_table, + .acpi_match_table = ls2x_i2c_acpi_match, + }, +}; + +/* The DC subsystem depends on it, we should initialize it earlier */ +static int __init ls2x_i2c_init_driver(void) +{ + return platform_driver_register(&ls2x_i2c_driver); +} +subsys_initcall(ls2x_i2c_init_driver); + +static void __exit ls2x_i2c_exit_driver(void) +{ + platform_driver_unregister(&ls2x_i2c_driver); +} +module_exit(ls2x_i2c_exit_driver); + +MODULE_DESCRIPTION("Loongson LS2X I2C Bus driver"); +MODULE_AUTHOR("Loongson Technology Corporation Limited"); +MODULE_LICENSE("GPL"); From patchwork Fri Dec 23 09:01:15 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Binbin Zhou X-Patchwork-Id: 636772 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 3BE2EC3DA6E for ; Fri, 23 Dec 2022 09:00:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235673AbiLWJA5 (ORCPT ); Fri, 23 Dec 2022 04:00:57 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42128 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235818AbiLWJA4 (ORCPT ); Fri, 23 Dec 2022 04:00:56 -0500 Received: from loongson.cn (mail.loongson.cn [114.242.206.163]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id C6CA8178B5; Fri, 23 Dec 2022 01:00:54 -0800 (PST) Received: from loongson.cn (unknown [112.20.108.31]) by gateway (Coremail) with SMTP id _____8CxKelFbqVjeA0IAA--.14644S3; Fri, 23 Dec 2022 17:00:53 +0800 (CST) Received: from localhost.localdomain (unknown [112.20.108.31]) by localhost.localdomain (Coremail) with SMTP id AQAAf8CxXL5EbqVjET4JAA--.4282S2; Fri, 23 Dec 2022 17:00:52 +0800 (CST) From: Binbin Zhou To: Wolfram Sang , Wolfram Sang , Andy Shevchenko , Mika Westerberg , linux-i2c@vger.kernel.org Cc: loongarch@lists.linux.dev, devicetree@vger.kernel.org, Huacai Chen , WANG Xuerui , Andy Shevchenko , Arnd Bergmann , Rob Herring , Krzysztof Kozlowski , Jianmin Lv , Binbin Zhou Subject: [PATCH V8 4/4] LoongArch: Enable LS2X I2C in loongson3_defconfig Date: Fri, 23 Dec 2022 17:01:15 +0800 Message-Id: <485512df54a8554770b3782665adaa22eff9e036.1671688961.git.zhoubinbin@loongson.cn> X-Mailer: git-send-email 2.31.1 In-Reply-To: References: MIME-Version: 1.0 X-CM-TRANSID: AQAAf8CxXL5EbqVjET4JAA--.4282S2 X-CM-SenderInfo: p2kr3uplqex0o6or00hjvr0hdfq/ X-Coremail-Antispam: 1Uk129KBjvdXoW7Jry5XrWkuF48uF15Ww1fXrb_yoWxKFX_JF y7Kw1kWr48JFZ7W3WIqw4rGw4DA3W7X3WFkr17Zw1xX3Waqr13JrWDAw17C3Z0ga4DWr43 ZaykJF9F9r18tjkaLaAFLSUrUUUUnb8apTn2vfkv8UJUUUU8wcxFpf9Il3svdxBIdaVrn0 xqx4xG64xvF2IEw4CE5I8CrVC2j2Jv73VFW2AGmfu7bjvjm3AaLaJ3UjIYCTnIWjp_UUUY C7kC6x804xWl14x267AKxVWUJVW8JwAFc2x0x2IEx4CE42xK8VAvwI8IcIk0rVWrJVCq3w AFIxvE14AKwVWUXVWUAwA2ocxC64kIII0Yj41l84x0c7CEw4AK67xGY2AK021l84ACjcxK 6xIIjxv20xvE14v26F1j6w1UM28EF7xvwVC0I7IYx2IY6xkF7I0E14v26F4j6r4UJwA2z4 x0Y4vEx4A2jsIE14v26F4UJVW0owA2z4x0Y4vEx4A2jsIEc7CjxVAFwI0_Cr1j6rxdM2kK e7AKxVWUAVWUtwAS0I0E0xvYzxvE52x082IY62kv0487Mc804VCY07AIYIkI8VC2zVCFFI 0UMc02F40EFcxC0VAKzVAqx4xG6I80ewAv7VC0I7IYx2IY67AKxVWrXVW3AwAv7VC2z280 aVAFwI0_Gr0_Cr1lOx8S6xCaFVCjc4AY6r1j6r4UM4x0Y48IcxkI7VAKI48JMxkF7I0En4 kS14v26r1q6r43MxAIw28IcxkI7VAKI48JMxC20s026xCaFVCjc4AY6r1j6r4UMxCIbckI 1I0E14v26r126r1DMI8I3I0E5I8CrVAFwI0_Jr0_Jr4lx2IqxVCjr7xvwVAFwI0_JrI_Jr Wlx4CE17CEb7AF67AKxVWUtVW8ZwCIc40Y0x0EwIxGrwCI42IY6xIIjxv20xvE14v26ryj 6F1UMIIF0xvE2Ix0cI8IcVCY1x0267AKxVWxJVW8Jr1lIxAIcVCF04k26cxKx2IYs7xG6r 1j6r1xMIIF0xvEx4A2jsIE14v26r4j6F4UMIIF0xvEx4A2jsIEc7CjxVAFwI0_Gr0_Gr1U YxBIdaVFxhVjvjDU0xZFpf9x07jfHUhUUUUU= Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org This is now supported, enable for Loongson-3 systems. Other systems are unaffected. Signed-off-by: Binbin Zhou --- arch/loongarch/configs/loongson3_defconfig | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/loongarch/configs/loongson3_defconfig b/arch/loongarch/configs/loongson3_defconfig index cb52774c80e8..5677c4f8576e 100644 --- a/arch/loongarch/configs/loongson3_defconfig +++ b/arch/loongarch/configs/loongson3_defconfig @@ -602,6 +602,7 @@ CONFIG_HW_RANDOM_VIRTIO=m CONFIG_I2C_CHARDEV=y CONFIG_I2C_PIIX4=y CONFIG_I2C_GPIO=y +CONFIG_I2C_LS2X=y CONFIG_SPI=y CONFIG_GPIO_SYSFS=y CONFIG_GPIO_LOONGSON=y