From patchwork Thu Jun 8 07:28:18 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yinbo Zhu X-Patchwork-Id: 690827 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 6AA85C7EE25 for ; Thu, 8 Jun 2023 07:28:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235362AbjFHH2i (ORCPT ); Thu, 8 Jun 2023 03:28:38 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33318 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235356AbjFHH2i (ORCPT ); Thu, 8 Jun 2023 03:28:38 -0400 Received: from mail.loongson.cn (mail.loongson.cn [114.242.206.163]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 8C3191FDA; Thu, 8 Jun 2023 00:28:29 -0700 (PDT) Received: from loongson.cn (unknown [10.20.42.35]) by gateway (Coremail) with SMTP id _____8CxPuscg4Fk6XMAAA--.1813S3; Thu, 08 Jun 2023 15:28:28 +0800 (CST) Received: from user-pc.202.106.0.20 (unknown [10.20.42.35]) by localhost.localdomain (Coremail) with SMTP id AQAAf8BxC8oVg4Fka+EGAA--.13745S3; Thu, 08 Jun 2023 15:28:26 +0800 (CST) From: Yinbo Zhu To: Mark Brown , Rob Herring , Krzysztof Kozlowski , linux-spi@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Jianmin Lv , wanghongliang@loongson.cn, Liu Peibao , loongson-kernel@lists.loongnix.cn, Yinbo Zhu , Krzysztof Kozlowski Subject: [PATCH v12 1/2] spi: add loongson spi bindings Date: Thu, 8 Jun 2023 15:28:18 +0800 Message-Id: <20230608072819.25930-2-zhuyinbo@loongson.cn> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20230608072819.25930-1-zhuyinbo@loongson.cn> References: <20230608072819.25930-1-zhuyinbo@loongson.cn> MIME-Version: 1.0 X-CM-TRANSID: AQAAf8BxC8oVg4Fka+EGAA--.13745S3 X-CM-SenderInfo: 52kx5xhqerqz5rrqw2lrqou0/ X-Coremail-Antispam: 1Uk129KBjDUn29KB7ZKAUJUUUUU529EdanIXcx71UUUUU7KY7 ZEXasCq-sGcSsGvfJ3UbIjqfuFe4nvWSU5nxnvy29KBjDU0xBIdaVrnUUvcSsGvfC2Kfnx nUUI43ZEXa7xR_UUUUUUUUU== Precedence: bulk List-ID: X-Mailing-List: linux-spi@vger.kernel.org Add the Loongson platform spi binding with DT schema format using json-schema. Signed-off-by: Yinbo Zhu Reviewed-by: Krzysztof Kozlowski --- .../bindings/spi/loongson,ls2k-spi.yaml | 41 +++++++++++++++++++ MAINTAINERS | 6 +++ 2 files changed, 47 insertions(+) create mode 100644 Documentation/devicetree/bindings/spi/loongson,ls2k-spi.yaml diff --git a/Documentation/devicetree/bindings/spi/loongson,ls2k-spi.yaml b/Documentation/devicetree/bindings/spi/loongson,ls2k-spi.yaml new file mode 100644 index 000000000000..423ee851edd5 --- /dev/null +++ b/Documentation/devicetree/bindings/spi/loongson,ls2k-spi.yaml @@ -0,0 +1,41 @@ +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/spi/loongson,ls2k-spi.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Loongson SPI controller + +maintainers: + - Yinbo Zhu + +allOf: + - $ref: /schemas/spi/spi-controller.yaml# + +properties: + compatible: + enum: + - loongson,ls2k1000-spi + + reg: + maxItems: 1 + + clocks: + maxItems: 1 + +required: + - compatible + - reg + - clocks + +unevaluatedProperties: false + +examples: + - | + spi0: spi@1fff0220{ + compatible = "loongson,ls2k1000-spi"; + reg = <0x1fff0220 0x10>; + clocks = <&clk 17>; + #address-cells = <1>; + #size-cells = <0>; + }; diff --git a/MAINTAINERS b/MAINTAINERS index bc201627c2e0..5e604dddd87b 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -12186,6 +12186,12 @@ F: Documentation/devicetree/bindings/clock/loongson,ls2k-clk.yaml F: drivers/clk/clk-loongson2.c F: include/dt-bindings/clock/loongson,ls2k-clk.h +LOONGSON SPI DRIVER +M: Yinbo Zhu +L: linux-spi@vger.kernel.org +S: Maintained +F: Documentation/devicetree/bindings/spi/loongson,ls2k-spi.yaml + LOONGSON-2 SOC SERIES GUTS DRIVER M: Yinbo Zhu L: loongarch@lists.linux.dev From patchwork Thu Jun 8 07:28:19 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yinbo Zhu X-Patchwork-Id: 690826 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 50A16C7EE45 for ; Thu, 8 Jun 2023 07:28:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234268AbjFHH2k (ORCPT ); Thu, 8 Jun 2023 03:28:40 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33328 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235375AbjFHH2j (ORCPT ); Thu, 8 Jun 2023 03:28:39 -0400 Received: from mail.loongson.cn (mail.loongson.cn [114.242.206.163]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 0F7DC2694; Thu, 8 Jun 2023 00:28:29 -0700 (PDT) Received: from loongson.cn (unknown [10.20.42.35]) by gateway (Coremail) with SMTP id _____8DxDescg4Fk7XMAAA--.1756S3; Thu, 08 Jun 2023 15:28:28 +0800 (CST) Received: from user-pc.202.106.0.20 (unknown [10.20.42.35]) by localhost.localdomain (Coremail) with SMTP id AQAAf8BxC8oVg4Fka+EGAA--.13745S4; Thu, 08 Jun 2023 15:28:28 +0800 (CST) From: Yinbo Zhu To: Mark Brown , Rob Herring , Krzysztof Kozlowski , linux-spi@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Jianmin Lv , wanghongliang@loongson.cn, Liu Peibao , loongson-kernel@lists.loongnix.cn, Yinbo Zhu , Andy Shevchenko Subject: [PATCH v12 2/2] spi: loongson: add bus driver for the loongson spi controller Date: Thu, 8 Jun 2023 15:28:19 +0800 Message-Id: <20230608072819.25930-3-zhuyinbo@loongson.cn> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20230608072819.25930-1-zhuyinbo@loongson.cn> References: <20230608072819.25930-1-zhuyinbo@loongson.cn> MIME-Version: 1.0 X-CM-TRANSID: AQAAf8BxC8oVg4Fka+EGAA--.13745S4 X-CM-SenderInfo: 52kx5xhqerqz5rrqw2lrqou0/ X-Coremail-Antispam: 1Uk129KBjDUn29KB7ZKAUJUUUUU529EdanIXcx71UUUUU7KY7 ZEXasCq-sGcSsGvfJ3UbIjqfuFe4nvWSU5nxnvy29KBjDU0xBIdaVrnUUvcSsGvfC2Kfnx nUUI43ZEXa7xR_UUUUUUUUU== Precedence: bulk List-ID: X-Mailing-List: linux-spi@vger.kernel.org This bus driver supports the Loongson SPI hardware controller in the Loongson platforms and supports to use DTS and PCI framework to register SPI device resources. Signed-off-by: Yinbo Zhu Cc: Andy Shevchenko Cc: Mark Brown Reviewed-by: Andy Shevchenko --- MAINTAINERS | 4 + drivers/spi/Kconfig | 26 +++ drivers/spi/Makefile | 3 + drivers/spi/spi-loongson-core.c | 275 ++++++++++++++++++++++++++++++++ drivers/spi/spi-loongson-pci.c | 55 +++++++ drivers/spi/spi-loongson-plat.c | 47 ++++++ drivers/spi/spi-loongson.h | 49 ++++++ 7 files changed, 459 insertions(+) create mode 100644 drivers/spi/spi-loongson-core.c create mode 100644 drivers/spi/spi-loongson-pci.c create mode 100644 drivers/spi/spi-loongson-plat.c create mode 100644 drivers/spi/spi-loongson.h diff --git a/MAINTAINERS b/MAINTAINERS index 5e604dddd87b..69cb8fb2a0e1 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -12191,6 +12191,10 @@ M: Yinbo Zhu L: linux-spi@vger.kernel.org S: Maintained F: Documentation/devicetree/bindings/spi/loongson,ls2k-spi.yaml +F: drivers/spi/spi-loongson-core.c +F: drivers/spi/spi-loongson-pci.c +F: drivers/spi/spi-loongson-plat.c +F: drivers/spi/spi-loongson.h LOONGSON-2 SOC SERIES GUTS DRIVER M: Yinbo Zhu diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig index 3de2ebe8294a..6b953904792e 100644 --- a/drivers/spi/Kconfig +++ b/drivers/spi/Kconfig @@ -516,6 +516,32 @@ config SPI_LM70_LLP which interfaces to an LM70 temperature sensor using a parallel port. +config SPI_LOONGSON_CORE + tristate + depends on LOONGARCH || COMPILE_TEST + +config SPI_LOONGSON_PCI + tristate "Loongson SPI Controller PCI Driver Support" + select SPI_LOONGSON_CORE + depends on PCI && (LOONGARCH || COMPILE_TEST) + help + This bus driver supports the Loongson SPI hardware controller in + the Loongson platforms and supports to use PCI framework to + register SPI device resources. + Say Y or M here if you want to use the SPI controller on + Loongson platform. + +config SPI_LOONGSON_PLATFORM + tristate "Loongson SPI Controller Platform Driver Support" + select SPI_LOONGSON_CORE + depends on OF && (LOONGARCH || COMPILE_TEST) + help + This bus driver supports the Loongson SPI hardware controller in + the Loongson platforms and supports to use DTS framework to + register SPI device resources. + Say Y or M here if you want to use the SPI controller on + Loongson platform. + config SPI_LP8841_RTC tristate "ICP DAS LP-8841 SPI Controller for RTC" depends on MACH_PXA27X_DT || COMPILE_TEST diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile index 28c4817a8a74..3e933064d237 100644 --- a/drivers/spi/Makefile +++ b/drivers/spi/Makefile @@ -71,6 +71,9 @@ obj-$(CONFIG_SPI_INTEL_PLATFORM) += spi-intel-platform.o obj-$(CONFIG_SPI_LANTIQ_SSC) += spi-lantiq-ssc.o obj-$(CONFIG_SPI_JCORE) += spi-jcore.o obj-$(CONFIG_SPI_LM70_LLP) += spi-lm70llp.o +obj-$(CONFIG_SPI_LOONGSON_CORE) += spi-loongson-core.o +obj-$(CONFIG_SPI_LOONGSON_PCI) += spi-loongson-pci.o +obj-$(CONFIG_SPI_LOONGSON_PLATFORM) += spi-loongson-plat.o obj-$(CONFIG_SPI_LP8841_RTC) += spi-lp8841-rtc.o obj-$(CONFIG_SPI_MESON_SPICC) += spi-meson-spicc.o obj-$(CONFIG_SPI_MESON_SPIFC) += spi-meson-spifc.o diff --git a/drivers/spi/spi-loongson-core.c b/drivers/spi/spi-loongson-core.c new file mode 100644 index 000000000000..403b735bd0cf --- /dev/null +++ b/drivers/spi/spi-loongson-core.c @@ -0,0 +1,275 @@ +// SPDX-License-Identifier: GPL-2.0+ +// Loongson SPI Support +// Copyright (C) 2023 Loongson Technology Corporation Limited + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "spi-loongson.h" + +static inline void loongson_spi_write_reg(struct loongson_spi *spi, unsigned char reg, + unsigned char data) +{ + writeb(data, spi->base + reg); +} + +static inline char loongson_spi_read_reg(struct loongson_spi *spi, unsigned char reg) +{ + return readb(spi->base + reg); +} + +static void loongson_spi_set_cs(struct spi_device *spi, bool val) +{ + int cs; + struct loongson_spi *loongson_spi = spi_controller_get_devdata(spi->controller); + + cs = loongson_spi_read_reg(loongson_spi, LOONGSON_SPI_SFCS_REG) + & ~(0x11 << spi_get_chipselect(spi, 0)); + loongson_spi_write_reg(loongson_spi, LOONGSON_SPI_SFCS_REG, + (val ? (0x11 << spi_get_chipselect(spi, 0)) : + (0x1 << spi_get_chipselect(spi, 0))) | cs); +} + +static void loongson_spi_set_clk(struct loongson_spi *loongson_spi, unsigned int hz) +{ + unsigned char val; + unsigned int div, div_tmp; + static const char rdiv[12] = {0, 1, 4, 2, 3, 5, 6, 7, 8, 9, 10, 11}; + + div = clamp_val(DIV_ROUND_UP_ULL(loongson_spi->clk_rate, hz), 2, 4096); + div_tmp = rdiv[fls(div - 1)]; + loongson_spi->spcr = (div_tmp & GENMASK(1, 0)) >> 0; + loongson_spi->sper = (div_tmp & GENMASK(3, 2)) >> 2; + val = loongson_spi_read_reg(loongson_spi, LOONGSON_SPI_SPCR_REG); + loongson_spi_write_reg(loongson_spi, LOONGSON_SPI_SPCR_REG, (val & ~3) | + loongson_spi->spcr); + val = loongson_spi_read_reg(loongson_spi, LOONGSON_SPI_SPER_REG); + loongson_spi_write_reg(loongson_spi, LOONGSON_SPI_SPER_REG, (val & ~3) | + loongson_spi->sper); + loongson_spi->hz = hz; +} + +static void loongson_spi_set_mode(struct loongson_spi *loongson_spi, + struct spi_device *spi) +{ + unsigned char val; + + val = loongson_spi_read_reg(loongson_spi, LOONGSON_SPI_SPCR_REG); + val &= ~(LOONGSON_SPI_SPCR_CPOL | LOONGSON_SPI_SPCR_CPHA); + if (spi->mode & SPI_CPOL) + val |= LOONGSON_SPI_SPCR_CPOL; + if (spi->mode & SPI_CPHA) + val |= LOONGSON_SPI_SPCR_CPHA; + + loongson_spi_write_reg(loongson_spi, LOONGSON_SPI_SPCR_REG, val); + loongson_spi->mode |= spi->mode; +} + +static int loongson_spi_update_state(struct loongson_spi *loongson_spi, + struct spi_device *spi, struct spi_transfer *t) +{ + if (t && loongson_spi->hz != t->speed_hz) + loongson_spi_set_clk(loongson_spi, t->speed_hz); + + if ((spi->mode ^ loongson_spi->mode) & SPI_MODE_X_MASK) + loongson_spi_set_mode(loongson_spi, spi); + + return 0; +} + +static int loongson_spi_setup(struct spi_device *spi) +{ + struct loongson_spi *loongson_spi; + + loongson_spi = spi_controller_get_devdata(spi->controller); + if (spi->bits_per_word % 8) + return -EINVAL; + + if (spi_get_chipselect(spi, 0) >= spi->controller->num_chipselect) + return -EINVAL; + + loongson_spi->hz = 0; + loongson_spi_set_cs(spi, 1); + + return 0; +} + +static int loongson_spi_write_read_8bit(struct spi_device *spi, const u8 **tx_buf, + u8 **rx_buf, unsigned int num) +{ + int ret; + struct loongson_spi *loongson_spi = spi_controller_get_devdata(spi->controller); + + if (tx_buf && *tx_buf) + loongson_spi_write_reg(loongson_spi, LOONGSON_SPI_FIFO_REG, *((*tx_buf)++)); + else + loongson_spi_write_reg(loongson_spi, LOONGSON_SPI_FIFO_REG, 0); + ret = readb_poll_timeout(loongson_spi->base + LOONGSON_SPI_SPSR_REG, loongson_spi->spsr, + (loongson_spi->spsr & 0x1) != LOONGSON_SPI_SPSR_RFEMPTY, 1, MSEC_PER_SEC); + + if (rx_buf && *rx_buf) + *(*rx_buf)++ = loongson_spi_read_reg(loongson_spi, LOONGSON_SPI_FIFO_REG); + else + loongson_spi_read_reg(loongson_spi, LOONGSON_SPI_FIFO_REG); + + return ret; +} + +static int loongson_spi_write_read(struct spi_device *spi, struct spi_transfer *xfer) +{ + int ret; + unsigned int count; + const u8 *tx = xfer->tx_buf; + u8 *rx = xfer->rx_buf; + + count = xfer->len; + + do { + ret = loongson_spi_write_read_8bit(spi, &tx, &rx, count); + if (ret) + break; + } while (--count); + + return ret; +} + +static int loongson_spi_prepare_message(struct spi_controller *ctlr, struct spi_message *m) +{ + struct loongson_spi *loongson_spi = spi_controller_get_devdata(ctlr); + + loongson_spi->para = loongson_spi_read_reg(loongson_spi, LOONGSON_SPI_PARA_REG); + loongson_spi_write_reg(loongson_spi, LOONGSON_SPI_PARA_REG, loongson_spi->para & ~1); + + return 0; +} + +static int loongson_spi_transfer_one(struct spi_controller *ctrl, struct spi_device *spi, + struct spi_transfer *xfer) +{ + struct loongson_spi *loongson_spi = spi_controller_get_devdata(spi->controller); + + loongson_spi_update_state(loongson_spi, spi, xfer); + if (xfer->len) + return loongson_spi_write_read(spi, xfer); + + return 0; +} + +static int loongson_spi_unprepare_message(struct spi_controller *ctrl, struct spi_message *m) +{ + struct loongson_spi *loongson_spi = spi_controller_get_devdata(ctrl); + + loongson_spi_write_reg(loongson_spi, LOONGSON_SPI_PARA_REG, loongson_spi->para); + + return 0; +} + +static void loongson_spi_reginit(struct loongson_spi *loongson_spi_dev) +{ + unsigned char val; + + val = loongson_spi_read_reg(loongson_spi_dev, LOONGSON_SPI_SPCR_REG); + val &= ~LOONGSON_SPI_SPCR_SPE; + loongson_spi_write_reg(loongson_spi_dev, LOONGSON_SPI_SPCR_REG, val); + + loongson_spi_write_reg(loongson_spi_dev, LOONGSON_SPI_SPSR_REG, + (LOONGSON_SPI_SPSR_SPIF | LOONGSON_SPI_SPSR_WCOL)); + + val = loongson_spi_read_reg(loongson_spi_dev, LOONGSON_SPI_SPCR_REG); + val |= LOONGSON_SPI_SPCR_SPE; + loongson_spi_write_reg(loongson_spi_dev, LOONGSON_SPI_SPCR_REG, val); +} + +int loongson_spi_init_controller(struct device *dev, void __iomem *regs) +{ + struct spi_controller *controller; + struct loongson_spi *spi; + struct clk *clk; + + controller = devm_spi_alloc_host(dev, sizeof(struct loongson_spi)); + if (controller == NULL) + return -ENOMEM; + + controller->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH; + controller->setup = loongson_spi_setup; + controller->prepare_message = loongson_spi_prepare_message; + controller->transfer_one = loongson_spi_transfer_one; + controller->unprepare_message = loongson_spi_unprepare_message; + controller->set_cs = loongson_spi_set_cs; + controller->num_chipselect = 4; + device_set_node(&controller->dev, dev_fwnode(dev)); + dev_set_drvdata(dev, controller); + + spi = spi_controller_get_devdata(controller); + spi->base = regs; + spi->controller = controller; + + clk = devm_clk_get_optional(dev, NULL); + if (IS_ERR(clk)) + return dev_err_probe(dev, PTR_ERR(clk), "unable to get clock\n"); + + spi->clk_rate = clk_get_rate(clk); + loongson_spi_reginit(spi); + + spi->mode = 0; + + return devm_spi_register_controller(dev, controller); +} +EXPORT_SYMBOL_NS_GPL(loongson_spi_init_controller, SPI_LOONGSON_CORE); + +static int __maybe_unused loongson_spi_suspend(struct device *dev) +{ + struct loongson_spi *loongson_spi; + struct spi_controller *controller; + + controller = dev_get_drvdata(dev); + spi_controller_suspend(controller); + + loongson_spi = spi_controller_get_devdata(controller); + + loongson_spi->spcr = loongson_spi_read_reg(loongson_spi, LOONGSON_SPI_SPCR_REG); + loongson_spi->sper = loongson_spi_read_reg(loongson_spi, LOONGSON_SPI_SPER_REG); + loongson_spi->spsr = loongson_spi_read_reg(loongson_spi, LOONGSON_SPI_SPSR_REG); + loongson_spi->para = loongson_spi_read_reg(loongson_spi, LOONGSON_SPI_PARA_REG); + loongson_spi->sfcs = loongson_spi_read_reg(loongson_spi, LOONGSON_SPI_SFCS_REG); + loongson_spi->timi = loongson_spi_read_reg(loongson_spi, LOONGSON_SPI_TIMI_REG); + + return 0; +} + +static int __maybe_unused loongson_spi_resume(struct device *dev) +{ + struct loongson_spi *loongson_spi; + struct spi_controller *controller; + + controller = dev_get_drvdata(dev); + loongson_spi = spi_controller_get_devdata(controller); + + loongson_spi_write_reg(loongson_spi, LOONGSON_SPI_SPCR_REG, loongson_spi->spcr); + loongson_spi_write_reg(loongson_spi, LOONGSON_SPI_SPER_REG, loongson_spi->sper); + loongson_spi_write_reg(loongson_spi, LOONGSON_SPI_SPSR_REG, loongson_spi->spsr); + loongson_spi_write_reg(loongson_spi, LOONGSON_SPI_PARA_REG, loongson_spi->para); + loongson_spi_write_reg(loongson_spi, LOONGSON_SPI_SFCS_REG, loongson_spi->sfcs); + loongson_spi_write_reg(loongson_spi, LOONGSON_SPI_TIMI_REG, loongson_spi->timi); + + spi_controller_resume(controller); + + return 0; +} + +const struct dev_pm_ops loongson_spi_dev_pm_ops = { + .suspend = loongson_spi_suspend, + .resume = loongson_spi_resume, +}; +EXPORT_SYMBOL_NS_GPL(loongson_spi_dev_pm_ops, SPI_LOONGSON_CORE); + +MODULE_DESCRIPTION("Loongson SPI core driver"); +MODULE_LICENSE("GPL"); diff --git a/drivers/spi/spi-loongson-pci.c b/drivers/spi/spi-loongson-pci.c new file mode 100644 index 000000000000..134cda0c13a5 --- /dev/null +++ b/drivers/spi/spi-loongson-pci.c @@ -0,0 +1,55 @@ +// SPDX-License-Identifier: GPL-2.0+ +// PCI interface driver for Loongson SPI Support +// Copyright (C) 2023 Loongson Technology Corporation Limited + +#include +#include + +#include "spi-loongson.h" + +static int loongson_spi_pci_register(struct pci_dev *pdev, + const struct pci_device_id *ent) +{ + int ret; + void __iomem *reg_base; + struct device *dev = &pdev->dev; + int pci_bar = 0; + + ret = pcim_enable_device(pdev); + if (ret < 0) + return dev_err_probe(dev, ret, "cannot enable pci device\n"); + + ret = pcim_iomap_regions(pdev, BIT(pci_bar), pci_name(pdev)); + if (ret) + return dev_err_probe(dev, ret, "failed to request and remap memory\n"); + + reg_base = pcim_iomap_table(pdev)[pci_bar]; + + ret = loongson_spi_init_controller(dev, reg_base); + if (ret) + return dev_err_probe(dev, ret, "failed to initialize controller\n"); + + return 0; +} + +static struct pci_device_id loongson_spi_devices[] = { + { PCI_DEVICE(PCI_VENDOR_ID_LOONGSON, 0x7a0b) }, + { PCI_DEVICE(PCI_VENDOR_ID_LOONGSON, 0x7a1b) }, + { } +}; +MODULE_DEVICE_TABLE(pci, loongson_spi_devices); + +static struct pci_driver loongson_spi_pci_driver = { + .name = "loongson-spi-pci", + .id_table = loongson_spi_devices, + .probe = loongson_spi_pci_register, + .driver = { + .bus = &pci_bus_type, + .pm = &loongson_spi_dev_pm_ops, + }, +}; +module_pci_driver(loongson_spi_pci_driver); + +MODULE_DESCRIPTION("Loongson spi pci driver"); +MODULE_LICENSE("GPL"); +MODULE_IMPORT_NS(SPI_LOONGSON_CORE); diff --git a/drivers/spi/spi-loongson-plat.c b/drivers/spi/spi-loongson-plat.c new file mode 100644 index 000000000000..c066e5f5891e --- /dev/null +++ b/drivers/spi/spi-loongson-plat.c @@ -0,0 +1,47 @@ +// SPDX-License-Identifier: GPL-2.0+ +// Platform driver for Loongson SPI Support +// Copyright (C) 2023 Loongson Technology Corporation Limited + +#include +#include +#include + +#include "spi-loongson.h" + +static int loongson_spi_platform_probe(struct platform_device *pdev) +{ + int ret; + void __iomem *reg_base; + struct device *dev = &pdev->dev; + + reg_base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(reg_base)) + return PTR_ERR(reg_base); + + ret = loongson_spi_init_controller(dev, reg_base); + if (ret) + return dev_err_probe(dev, ret, "failed to initialize controller\n"); + + return 0; +} + +static const struct of_device_id loongson_spi_id_table[] = { + { .compatible = "loongson,ls2k1000-spi" }, + { } +}; +MODULE_DEVICE_TABLE(of, loongson_spi_id_table); + +static struct platform_driver loongson_spi_plat_driver = { + .probe = loongson_spi_platform_probe, + .driver = { + .name = "loongson-spi", + .bus = &platform_bus_type, + .pm = &loongson_spi_dev_pm_ops, + .of_match_table = loongson_spi_id_table, + }, +}; +module_platform_driver(loongson_spi_plat_driver); + +MODULE_DESCRIPTION("Loongson spi platform driver"); +MODULE_LICENSE("GPL"); +MODULE_IMPORT_NS(SPI_LOONGSON_CORE); diff --git a/drivers/spi/spi-loongson.h b/drivers/spi/spi-loongson.h new file mode 100644 index 000000000000..35f95b161842 --- /dev/null +++ b/drivers/spi/spi-loongson.h @@ -0,0 +1,49 @@ +/* SPDX-License-Identifier: GPL-2.0+ */ +/* Header File for Loongson SPI Driver. */ +/* Copyright (C) 2023 Loongson Technology Corporation Limited */ + +#ifndef __LINUX_SPI_LOONGSON_H +#define __LINUX_SPI_LOONGSON_H + +#include +#include +#include + +#define LOONGSON_SPI_SPCR_REG 0x00 +#define LOONGSON_SPI_SPSR_REG 0x01 +#define LOONGSON_SPI_FIFO_REG 0x02 +#define LOONGSON_SPI_SPER_REG 0x03 +#define LOONGSON_SPI_PARA_REG 0x04 +#define LOONGSON_SPI_SFCS_REG 0x05 +#define LOONGSON_SPI_TIMI_REG 0x06 + +/* Bits definition for Loongson SPI register */ +#define LOONGSON_SPI_PARA_MEM_EN BIT(0) +#define LOONGSON_SPI_SPCR_CPHA BIT(2) +#define LOONGSON_SPI_SPCR_CPOL BIT(3) +#define LOONGSON_SPI_SPCR_SPE BIT(6) +#define LOONGSON_SPI_SPSR_RFEMPTY BIT(0) +#define LOONGSON_SPI_SPSR_WCOL BIT(6) +#define LOONGSON_SPI_SPSR_SPIF BIT(7) + +struct device; +struct spi_controller; + +struct loongson_spi { + struct spi_controller *controller; + void __iomem *base; + int cs_active; + unsigned int hz; + unsigned char spcr; + unsigned char sper; + unsigned char spsr; + unsigned char para; + unsigned char sfcs; + unsigned char timi; + unsigned int mode; + u64 clk_rate; +}; + +int loongson_spi_init_controller(struct device *dev, void __iomem *reg); +extern const struct dev_pm_ops loongson_spi_dev_pm_ops; +#endif /* __LINUX_SPI_LOONGSON_H */