From patchwork Wed Mar 8 02:59:08 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yinbo Zhu X-Patchwork-Id: 662674 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 B8F19C6FA99 for ; Wed, 8 Mar 2023 02:59:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229886AbjCHC7V (ORCPT ); Tue, 7 Mar 2023 21:59:21 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55856 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229480AbjCHC7T (ORCPT ); Tue, 7 Mar 2023 21:59:19 -0500 Received: from loongson.cn (mail.loongson.cn [114.242.206.163]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id F332DA3367; Tue, 7 Mar 2023 18:59:16 -0800 (PST) Received: from loongson.cn (unknown [10.20.42.35]) by gateway (Coremail) with SMTP id _____8AxbdoD+gdkO7IJAA--.12474S3; Wed, 08 Mar 2023 10:59:15 +0800 (CST) Received: from user-pc.202.106.0.20 (unknown [10.20.42.35]) by localhost.localdomain (Coremail) with SMTP id AQAAf8Bxyub9+QdkGeNOAA--.37836S4; Wed, 08 Mar 2023 10:59:15 +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 Subject: [PATCH v1 2/2] spi: loongson: add bus driver for the loongson spi controller Date: Wed, 8 Mar 2023 10:59:08 +0800 Message-Id: <20230308025908.21491-3-zhuyinbo@loongson.cn> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20230308025908.21491-1-zhuyinbo@loongson.cn> References: <20230308025908.21491-1-zhuyinbo@loongson.cn> MIME-Version: 1.0 X-CM-TRANSID: AQAAf8Bxyub9+QdkGeNOAA--.37836S4 X-CM-SenderInfo: 52kx5xhqerqz5rrqw2lrqou0/ X-Coremail-Antispam: 1Uk129KBjvAXoW3tr1fJr15JrWDJFyrGr18AFb_yoW8WFWUKo WxZas8Xr48ur18GFy0qr1Fqry7Xa45WrWqyrn3A3WkJws8tFyDJr9xJrW7CF18u3W3JFy7 ArySgFW8KF4IgFWkn29KB7ZKAUJUUUUr529EdanIXcx71UUUUU7KY7ZEXasCq-sGcSsGvf J3Ic02F40EFcxC0VAKzVAqx4xG6I80ebIjqfuFe4nvWSU5nxnvy29KBjDU0xBIdaVrnRJU UU9j1xkIjI8I6I8E6xAIw20EY4v20xvaj40_Wr0E3s1l1IIY67AEw4v_Jrv_JF1l8cAvFV AK0II2c7xJM28CjxkF64kEwVA0rcxSw2x7M28EF7xvwVC0I7IYx2IY67AKxVW5JVW7JwA2 z4x0Y4vE2Ix0cI8IcVCY1x0267AKxVW8JVWxJwA2z4x0Y4vEx4A2jsIE14v26r4UJVWxJr 1l84ACjcxK6I8E87Iv6xkF7I0E14v26r4UJVWxJr1ln4kS14v26r1Y6r17M2AIxVAIcxkE cVAq07x20xvEncxIr21l57IF6xkI12xvs2x26I8E6xACxx1l5I8CrVACY4xI64kE6c02F4 0Ex7xfMcIj6xIIjxv20xvE14v26r1q6rW5McIj6I8E87Iv67AKxVW8JVWxJwAm72CE4IkC 6x0Yz7v_Jr0_Gr1lF7xvr2IYc2Ij64vIr41l42xK82IYc2Ij64vIr41l42xK82IY6x8Erc xFaVAv8VWrMxC20s026xCaFVCjc4AY6r1j6r4UMxCIbckI1I0E14v26r1Y6r17MI8I3I0E 5I8CrVAFwI0_Jr0_Jr4lx2IqxVCjr7xvwVAFwI0_JrI_JrWlx4CE17CEb7AF67AKxVWUtV W8ZwCIc40Y0x0EwIxGrwCI42IY6xIIjxv20xvE14v26r4j6ryUMIIF0xvE2Ix0cI8IcVCY 1x0267AKxVW8JVWxJwCI42IY6xAIw20EY4v20xvaj40_Jr0_JF4lIxAIcVC2z280aVAFwI 0_Gr0_Cr1lIxAIcVC2z280aVCY1x0267AKxVW8JVW8JrUvcSsGvfC2KfnxnUUI43ZEXa7I U8QzVUUUUUU== 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 --- MAINTAINERS | 1 + drivers/spi/Kconfig | 10 + drivers/spi/Makefile | 1 + drivers/spi/spi-loongson.c | 502 +++++++++++++++++++++++++++++++++++++ 4 files changed, 514 insertions(+) create mode 100644 drivers/spi/spi-loongson.c diff --git a/MAINTAINERS b/MAINTAINERS index 0efb739e793f..2fd7a00ab120 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -12161,6 +12161,7 @@ M: Yinbo Zhu L: linux-spi@vger.kernel.org S: Maintained F: Documentation/devicetree/bindings/spi/loongson,ls-spi.yaml +F: drivers/spi/spi-loongson.c LSILOGIC MPT FUSION DRIVERS (FC/SAS/SPI) M: Sathya Prakash diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig index 36a18c215163..ad90b531ff96 100644 --- a/drivers/spi/Kconfig +++ b/drivers/spi/Kconfig @@ -509,6 +509,16 @@ config SPI_LM70_LLP which interfaces to an LM70 temperature sensor using a parallel port. +config SPI_LOONGSON + tristate "Loongson SPI Controller Support" + depends on LOONGARCH && OF && PCI + help + 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. + 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 d87cf75bee6a..cab3ff6d1814 100644 --- a/drivers/spi/Makefile +++ b/drivers/spi/Makefile @@ -70,6 +70,7 @@ 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-$(CONFIG_SPI_LOONGSON) += spi-loongson.o obj-$(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.c b/drivers/spi/spi-loongson.c new file mode 100644 index 000000000000..26316e873965 --- /dev/null +++ b/drivers/spi/spi-loongson.c @@ -0,0 +1,502 @@ +// 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 + +#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_SPSR_SPIF BIT(7) +#define LOONGSON_SPI_SPSR_WCOL BIT(6) +#define LOONGSON_SPI_SPCR_SPE BIT(6) + +struct loongson_spi { + struct work_struct work; + spinlock_t lock; + struct list_head msg_queue; + struct spi_master *master; + 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; + struct workqueue_struct *wq; + unsigned int mode; + u64 clk_rate; +}; + +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 inline int loongson_spi_set_cs(struct loongson_spi *loongson_spi, + struct spi_device *spi, int val) +{ + int cs; + + if (spi->mode & SPI_CS_HIGH) + val = !val; + + if (loongson_spi->mode & SPI_NO_CS) + loongson_spi_write_reg(loongson_spi, LOONGSON_SPI_SFCS_REG, 0); + else { + cs = loongson_spi_read_reg(loongson_spi, LOONGSON_SPI_SFCS_REG) + & ~(0x11 << spi->chip_select); + loongson_spi_write_reg(loongson_spi, + LOONGSON_SPI_SFCS_REG, + (val ? (0x11 << spi->chip_select) : + (0x1 << spi->chip_select)) | cs); + } + + return 0; +} + +static int loongson_spi_update_state(struct loongson_spi *loongson_spi, + struct spi_device *spi, struct spi_transfer *t) +{ + unsigned int hz; + unsigned int div, div_tmp; + unsigned int bit; + unsigned char val; + const char rdiv[12] = {0, 1, 4, 2, 3, 5, 6, 7, 8, 9, 10, 11}; + + hz = t ? t->speed_hz : spi->max_speed_hz; + + if (!hz) + hz = spi->max_speed_hz; + + if ((hz && loongson_spi->hz != hz) || + ((spi->mode ^ loongson_spi->mode) & (SPI_CPOL | SPI_CPHA))) { + div = DIV_ROUND_UP(loongson_spi->clk_rate, hz); + if (div < 2) + div = 2; + if (div > 4096) + div = 4096; + + bit = fls(div) - 1; + if ((1<dev, "clk_rate = %llu hz = %d div_tmp = %d bit = %d\n", + loongson_spi->clk_rate, hz, div_tmp, bit); + + loongson_spi->hz = hz; + loongson_spi->spcr = div_tmp & 3; + loongson_spi->sper = (div_tmp >> 2) & 3; + val = loongson_spi_read_reg(loongson_spi, LOONGSON_SPI_SPCR_REG); + val &= ~0xc; + if (spi->mode & SPI_CPOL) + val |= 8; + if (spi->mode & SPI_CPHA) + val |= 4; + + 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->mode &= SPI_NO_CS; + loongson_spi->mode |= spi->mode; + } + + return 0; +} + +static int loongson_spi_setup(struct spi_device *spi) +{ + struct loongson_spi *loongson_spi; + + loongson_spi = spi_master_get_devdata(spi->master); + if (spi->bits_per_word % 8) + return -EINVAL; + + if (spi->chip_select >= spi->master->num_chipselect) + return -EINVAL; + + loongson_spi_update_state(loongson_spi, spi, NULL); + loongson_spi_set_cs(loongson_spi, 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) +{ + struct loongson_spi *loongson_spi = spi_master_get_devdata(spi->master); + + if (tx_buf && *tx_buf) { + loongson_spi_write_reg(loongson_spi, LOONGSON_SPI_FIFO_REG, *((*tx_buf)++)); + while ((loongson_spi_read_reg(loongson_spi, LOONGSON_SPI_SPSR_REG) & 0x1) == 1) + ; + } else { + loongson_spi_write_reg(loongson_spi, LOONGSON_SPI_FIFO_REG, 0); + while ((loongson_spi_read_reg(loongson_spi, LOONGSON_SPI_SPSR_REG) & 0x1) == 1) + ; + } + + 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 0; +} + +static unsigned int loongson_spi_write_read(struct spi_device *spi, struct spi_transfer *xfer) +{ + unsigned int count; + const u8 *tx = xfer->tx_buf; + u8 *rx = xfer->rx_buf; + + count = xfer->len; + + do { + if (loongson_spi_write_read_8bit(spi, &tx, &rx, count) < 0) + goto out; + count--; + } while (count); + +out: + return xfer->len - count; +} + +static void loongson_spi_work(struct work_struct *work) +{ + int param; + struct spi_message *m; + struct spi_device *spi; + struct spi_transfer *t = NULL; + struct loongson_spi *loongson_spi = container_of(work, struct loongson_spi, work); + + spin_lock(&loongson_spi->lock); + param = loongson_spi_read_reg(loongson_spi, LOONGSON_SPI_PARA_REG); + loongson_spi_write_reg(loongson_spi, LOONGSON_SPI_PARA_REG, param&~1); + while (!list_empty(&loongson_spi->msg_queue)) { + m = container_of(loongson_spi->msg_queue.next, struct spi_message, queue); + + list_del_init(&m->queue); + spin_unlock(&loongson_spi->lock); + spi = m->spi; + loongson_spi_set_cs(loongson_spi, spi, 0); + + list_for_each_entry(t, &m->transfers, transfer_list) { + loongson_spi_update_state(loongson_spi, spi, t); + if (t->len) + m->actual_length += loongson_spi_write_read(spi, t); + } + + loongson_spi_set_cs(loongson_spi, spi, 1); + m->complete(m->context); + spin_lock(&loongson_spi->lock); + } + + loongson_spi_write_reg(loongson_spi, LOONGSON_SPI_PARA_REG, param); + spin_unlock(&loongson_spi->lock); +} + +static int loongson_spi_transfer(struct spi_device *spi, struct spi_message *m) +{ + struct loongson_spi *loongson_spi; + struct spi_transfer *t = NULL; + + m->status = 0; + m->actual_length = 0; + + if (list_empty(&m->transfers) || !m->complete) + return -EINVAL; + + loongson_spi = spi_master_get_devdata(spi->master); + + list_for_each_entry(t, &m->transfers, transfer_list) { + + if (t->tx_buf == NULL && t->rx_buf == NULL && t->len) { + dev_err(&spi->dev, "invalid transfer data buffers\n"); + goto msg_rejected; + } + } + + spin_lock(&loongson_spi->lock); + list_add_tail(&m->queue, &loongson_spi->msg_queue); + queue_work(loongson_spi->wq, &loongson_spi->work); + spin_unlock(&loongson_spi->lock); + + return 0; +msg_rejected: + m->status = -EINVAL; + + if (m->complete) + m->complete(m->context); + + return -EINVAL; +} + +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); +} + +static int loongson_spi_init_master(struct device *dev, struct resource *res) +{ + struct spi_master *master; + struct loongson_spi *spi; + struct clk *clk; + int ret; + + master = spi_alloc_master(dev, sizeof(struct loongson_spi)); + if (master == NULL) { + dev_dbg(dev, "master allocation failed\n"); + return -ENOMEM; + } + + master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH; + master->setup = loongson_spi_setup; + master->transfer = loongson_spi_transfer; + master->num_chipselect = 4; + master->dev.of_node = of_node_get(dev->of_node); + dev_set_drvdata(dev, master); + + spi = spi_master_get_devdata(master); + + spi->master = master; + + spi->wq = create_singlethread_workqueue("loongson-spi"); + + spi->base = devm_ioremap(dev, res->start, resource_size(res)); + if (spi->base == NULL) { + dev_err(dev, "cannot map io\n"); + ret = -ENXIO; + goto free_master; + } + + clk = devm_clk_get(dev, NULL); + if (!IS_ERR(clk)) + spi->clk_rate = clk_get_rate(clk); + + loongson_spi_reginit(spi); + + spi->mode = 0; + if (of_get_property(dev->of_node, "spi-nocs", NULL)) + spi->mode |= SPI_NO_CS; + + INIT_WORK(&spi->work, loongson_spi_work); + + spin_lock_init(&spi->lock); + INIT_LIST_HEAD(&spi->msg_queue); + + ret = spi_register_master(master); + if (ret < 0) + goto free_master; + + return ret; + +free_master: + kfree(master); + spi_master_put(master); + + return ret; +} + +static int loongson_spi_platform_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct resource *res; + int ret; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (res == NULL) { + dev_err(dev, "cannot get io resource memory\n"); + return -ENOENT; + } + + ret = loongson_spi_init_master(dev, res); + if (ret) + dev_err(dev, "failed to initialize master\n"); + + return ret; +} + +static int __maybe_unused loongson_spi_suspend(struct device *dev) +{ + struct loongson_spi *loongson_spi; + struct spi_master *master; + + master = dev_get_drvdata(dev); + loongson_spi = spi_master_get_devdata(master); + + 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_master *master; + + master = dev_get_drvdata(dev); + loongson_spi = spi_master_get_devdata(master); + + 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); + + return 0; +} + +static const struct dev_pm_ops loongson_spi_dev_pm_ops = { + .suspend = loongson_spi_suspend, + .resume = loongson_spi_resume, +}; + +static const struct of_device_id loongson_spi_id_table[] = { + { .compatible = "loongson,ls2k-spi", }, + { } +}; +MODULE_DEVICE_TABLE(of, loongson_spi_id_table); + +static struct platform_driver loongson_spi_driver = { + .probe = loongson_spi_platform_probe, + .driver = { + .name = "loongson-spi", + .owner = THIS_MODULE, + .bus = &platform_bus_type, + .pm = &loongson_spi_dev_pm_ops, + .of_match_table = loongson_spi_id_table, + }, +}; + +static int loongson_spi_pci_register(struct pci_dev *pdev, + const struct pci_device_id *ent) +{ + int ret; + unsigned char v8; + struct resource res[2]; + struct device *dev = &pdev->dev; + + ret = pci_enable_device(pdev); + if (ret < 0) { + dev_err(dev, "cannot enable pci device\n"); + goto err_out; + } + + ret = pci_request_region(pdev, 0, "loongson-spi io"); + if (ret < 0) { + dev_err(dev, "cannot request region 0.\n"); + goto err_out; + } + + res[0].start = pci_resource_start(pdev, 0); + res[0].end = pci_resource_end(pdev, 0); + ret = pci_read_config_byte(pdev, PCI_INTERRUPT_LINE, &v8); + + if (ret == PCIBIOS_SUCCESSFUL) { + res[1].start = v8; + res[1].end = v8; + } + + ret = loongson_spi_init_master(dev, res); + if (ret) + dev_err(dev, "failed to initialize master\n"); + +err_out: + return ret; +} + +static void loongson_spi_pci_unregister(struct pci_dev *pdev) +{ + pci_release_region(pdev, 0); +} + +static struct pci_device_id loongson_spi_devices[] = { + {PCI_DEVICE(0x14, 0x7a0b)}, + {PCI_DEVICE(0x14, 0x7a1b)}, + {0, 0, 0, 0, 0, 0, 0} +}; +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, + .remove = loongson_spi_pci_unregister, +}; + +static int __init loongson_spi_init(void) +{ + int ret; + + ret = platform_driver_register(&loongson_spi_driver); + if (ret) + return ret; + + ret = pci_register_driver(&loongson_spi_pci_driver); + if (ret) { + platform_driver_unregister(&loongson_spi_driver); + return ret; + } + + return 0; +} + +static void __exit loongson_spi_exit(void) +{ + platform_driver_unregister(&loongson_spi_driver); + pci_unregister_driver(&loongson_spi_pci_driver); +} + +subsys_initcall(loongson_spi_init); +module_exit(loongson_spi_exit); + +MODULE_DESCRIPTION("Loongson spi driver"); +MODULE_LICENSE("GPL");