From mboxrd@z Thu Jan 1 00:00:00 1970 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=-8.0 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,UNWANTED_LANGUAGE_BODY, URIBL_BLOCKED autolearn=ham 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 72F4AC433E0 for ; Mon, 4 Jan 2021 13:50:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 42D3021BE5 for ; Mon, 4 Jan 2021 13:50:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726258AbhADNu1 (ORCPT ); Mon, 4 Jan 2021 08:50:27 -0500 Received: from mout.gmx.net ([212.227.15.19]:58265 "EHLO mout.gmx.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725889AbhADNu0 (ORCPT ); Mon, 4 Jan 2021 08:50:26 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=gmx.net; s=badeba3b8450; t=1609768133; bh=4s4uHfoiw+kWXyg9AYWxLbRJd1TFBbZadA4Yeaxj6iA=; h=X-UI-Sender-Class:Date:From:To:Cc:Subject; b=i/2+z7R0RjvEYQ1RyfNp7BpQe01j4DWu+JRhDcPUtQ0AfnmL5Qyc7AEbW1QzPmk3M 9+4GF4+/rlaO+a4Nc0k3EmaPsSQAUvmkxSbHSyOrd8ZioSoW2U6J3DgoLMlZ+HhYrH lDwSi4u57E1on2q5gt7uXKdDd7+TpIuhvX5eUUnk= X-UI-Sender-Class: 01bb95c1-4bf8-414a-932a-4f6e2808ef9c Received: from Valinor ([82.128.181.212]) by mail.gmx.com (mrgmx004 [212.227.17.184]) with ESMTPSA (Nemesis) id 1Mkpf3-1kH3sI1Np1-00mJ2c; Mon, 04 Jan 2021 14:48:53 +0100 Date: Mon, 4 Jan 2021 15:50:31 +0200 From: Lauri Kasanen To: linux-mips@vger.kernel.org Cc: tsbogend@alpha.franken.de, axboe@kernel.dk, linux-block@vger.kernel.org Subject: [PATCH 6/6] block: Add n64 cart driver Message-Id: <20210104155031.9b4e39ff48a6d7accc93461d@gmx.com> X-Mailer: Sylpheed 3.5.0 (GTK+ 2.18.6; x86_64-unknown-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: quoted-printable X-Provags-ID: V03:K1:IwAitH4acIw64klRva/iFd2DgcCsW2pnIO7gEBlpGVEOOPMOA9F UVx15Y7sO0vsgdfAizzo4vDgdrblImylr6iaJW1UHvs+UO4pd5QjaooYnBC8J8vHj/c7QaB 0uu4mNV7CFJG6luWlSlTXfJRJBzXqNPGxU0LvjpQR/kIUw6r2cVks+urK8Gmegg+Ilr6sdu Ndk4yd9UAEtwuZW3A1ifA== X-UI-Out-Filterresults: notjunk:1;V03:K0:x0dBXb01Dho=:+onAcGopx1Ta6Hcld4k2// t9IAF0Z1TJIlLmFpQonmnEI1M3Q2mKVD9TtwfQhC9GBBEQ7r+gKw5QACTFwxTEEj97OA8xczH a+GgXeNxniQ9J7bGKTfKCkiEGUvWCb3D4mWbdRo5UJe83wezodIIcLOH7wlF0S1F3N/aJdiYZ yYStlYjkoJVvqD7KY+6JAIM5n04b8dWTWdOWYElwmOux4qwuXhnT2CMqkyKZyd4DAKerv1Xmy l1Jk1flaJB3J5nTKlGPPqpLNhIm1Gwx+yplGUoEDnetnP6BrcW+JGWdV+qNXHhR2Uun3gekun na6/66Ll7/WjiVYH9TxCVjN7YqprHkH2eAPjxvEuznaJ1kGUhlekipCqTfU+VrW2vGcRPLvTF WMyuH9fb2YtbG9EI8ijQzEGsYXoN76RP5IL7Bgc/pQKt9TTufHI9XaHh+QO3DJSFI8sqhn5CH dQldn3T+A4e02ZqinKAh2TUpeGjdg1QDWB/HZYnCRzKeIp3YJwKcJIfFTJCOlpU8LH4FbIkiA byNriO+YmfovMMtzGnRwrdQxQQR31zujElHu5C3l9Bbgpt76GgUjzDFRB66xUICdXlQA2nS2W oVaOWNJs/hESG8mqTMeG7xcWYhFaficGry5Q/EqG5ldv3/XWDyjIRkvnnI8kwkDo9XGrrVipP Xvo5OcVJ5+Tv01dnlkpkKaCFR9bRC/hiTdlu2B1TkbFhGi4MC68FZrnvzue+f9o06uqXUe4YK B7VFg6oreRqVPvqBfpHI8SA9/x0S1DtswNPaYrJTX68Mv3f6lI0csOKRwuZZ0Ol3jRsfg8fiH w5Hch7M/Kx5bzJHpYvBxxVRRLNolAGT46/zHsq3c6QRQBVDn41hLSGMqtz9EHQCilwtm4OXQz /EIjS4PvUCSRTAogF7ow== Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org Signed-off-by: Lauri Kasanen =2D-- drivers/block/Kconfig | 6 ++ drivers/block/Makefile | 1 + drivers/block/n64cart.c | 203 +++++++++++++++++++++++++++++++++++++++++++= +++++ 3 files changed, 210 insertions(+) create mode 100644 drivers/block/n64cart.c block folks: rest of the series is on linux-mips. Being a mips-specific dr= iver, not sure which tree it should go to. diff --git a/drivers/block/Kconfig b/drivers/block/Kconfig index ecceaaa..924d768 100644 =2D-- a/drivers/block/Kconfig +++ b/drivers/block/Kconfig @@ -72,6 +72,12 @@ config AMIGA_Z2RAM To compile this driver as a module, choose M here: the module will be called z2ram. +config N64CART + bool "N64 cart support" + depends on MACH_NINTENDO64 + help + Support for the N64 cart. + config CDROM tristate select BLK_SCSI_REQUEST diff --git a/drivers/block/Makefile b/drivers/block/Makefile index e1f6311..b9642cf 100644 =2D-- a/drivers/block/Makefile +++ b/drivers/block/Makefile @@ -17,6 +17,7 @@ obj-$(CONFIG_PS3_DISK) +=3D ps3disk.o obj-$(CONFIG_PS3_VRAM) +=3D ps3vram.o obj-$(CONFIG_ATARI_FLOPPY) +=3D ataflop.o obj-$(CONFIG_AMIGA_Z2RAM) +=3D z2ram.o +obj-$(CONFIG_N64CART) +=3D n64cart.o obj-$(CONFIG_BLK_DEV_RAM) +=3D brd.o obj-$(CONFIG_BLK_DEV_LOOP) +=3D loop.o obj-$(CONFIG_XILINX_SYSACE) +=3D xsysace.o diff --git a/drivers/block/n64cart.c b/drivers/block/n64cart.c new file mode 100644 index 0000000..ae2ad4f =2D-- /dev/null +++ b/drivers/block/n64cart.c @@ -0,0 +1,203 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Support for the N64 cart. + * + * Copyright (c) 2020 Lauri Kasanen + */ + +#include +#include +#include +#include +#include +#include +#include + +#include +#include + +MODULE_AUTHOR("Lauri Kasanen "); +MODULE_DESCRIPTION("Driver for the N64 cart"); +MODULE_LICENSE("GPL"); + +#define BUFSIZE (64 * 1024) + +static unsigned int start, size; +static int major; +static struct request_queue *queue; +static struct blk_mq_tag_set tag_set; +static struct gendisk *disk; + +static void *buf; +static dma_addr_t dma_addr; + +static DEFINE_SPINLOCK(n64cart_lock); + +#define REG_BASE ((u32 *) TO_UNCAC(0x4600000)) + +#define PI_DRAM_REG 0 +#define PI_CART_REG 1 +#define PI_READ_REG 2 +#define PI_WRITE_REG 3 +#define PI_STATUS_REG 4 + +#define PI_STATUS_DMA_BUSY (1 << 0) +#define PI_STATUS_IO_BUSY (1 << 1) + +static void n64cart_write_reg(const u8 reg, const u32 value) +{ + __raw_writel(value, REG_BASE + reg); +} + +static u32 n64cart_read_reg(const u8 reg) +{ + return __raw_readl(REG_BASE + reg); +} + +static void n64cart_wait_dma(void) +{ + while (n64cart_read_reg(PI_STATUS_REG) & + (PI_STATUS_DMA_BUSY | PI_STATUS_IO_BUSY)) + ; +} + +static blk_status_t get_seg(struct request *req) +{ + u32 bstart =3D blk_rq_pos(req) * 512; + u32 len =3D blk_rq_cur_bytes(req); + void *dst =3D bio_data(req->bio); + + if (bstart + len > size || rq_data_dir(req) =3D=3D WRITE) + return BLK_STS_IOERR; + + bstart +=3D start; + + while (len) { + const u32 curlen =3D len < BUFSIZE ? len : BUFSIZE; + + dma_cache_inv((unsigned long) buf, curlen); + + n64cart_wait_dma(); + + barrier(); + n64cart_write_reg(PI_DRAM_REG, dma_addr); + barrier(); + n64cart_write_reg(PI_CART_REG, (bstart | 0x10000000) & 0x1FFFFFFF); + barrier(); + n64cart_write_reg(PI_WRITE_REG, curlen - 1); + barrier(); + + n64cart_wait_dma(); + + memcpy(dst, buf, curlen); + + len -=3D curlen; + dst +=3D curlen; + bstart +=3D curlen; + } + + return BLK_STS_OK; +} + +static blk_status_t n64cart_queue_rq(struct blk_mq_hw_ctx *hctx, + const struct blk_mq_queue_data *bd) +{ + unsigned long flags; + struct request *req =3D bd->rq; + blk_status_t err; + + blk_mq_start_request(req); + + spin_lock_irqsave(&n64cart_lock, flags); + + do { + err =3D get_seg(req); + } while (blk_update_request(req, err, blk_rq_cur_bytes(req))); + + spin_unlock_irqrestore(&n64cart_lock, flags); + blk_mq_end_request(req, BLK_STS_OK); + return BLK_STS_OK; +} + +static const struct blk_mq_ops n64cart_mq_ops =3D { + .queue_rq =3D n64cart_queue_rq, +}; + +static const struct block_device_operations n64cart_fops =3D { + .owner =3D THIS_MODULE, +}; + +static int __init n64cart_init(void) +{ + int err; + + if (!start || !size) { + pr_err("n64cart: start and size not specified\n"); + return -ENODEV; + } + + if (size & 4095) { + pr_err("n64cart: size must be a multiple of 4K\n"); + return -ENODEV; + } + + major =3D register_blkdev(0, "n64cart"); + if (major <=3D 0) { + pr_err("n64cart: unable to get major number\n"); + return -EBUSY; + } + + queue =3D blk_mq_init_sq_queue(&tag_set, &n64cart_mq_ops, 16, + BLK_MQ_F_SHOULD_MERGE); + if (IS_ERR(queue)) { + err =3D PTR_ERR(queue); + goto fail_reg; + } + + buf =3D kmalloc(BUFSIZE, GFP_DMA | GFP_KERNEL); + if (!buf) { + err =3D -ENOMEM; + goto fail_queue; + } + dma_addr =3D virt_to_phys(buf); + + disk =3D alloc_disk(1); + if (!disk) { + err =3D -ENOMEM; + goto fail_dma; + } + + disk->major =3D major; + disk->first_minor =3D 0; + disk->queue =3D queue; + disk->flags =3D GENHD_FL_NO_PART_SCAN; + disk->fops =3D &n64cart_fops; + strcpy(disk->disk_name, "n64cart"); + + set_capacity(disk, size / 512); + + blk_queue_flag_set(QUEUE_FLAG_NONROT, queue); + blk_queue_physical_block_size(queue, 4096); + blk_queue_logical_block_size(queue, 4096); + + add_disk(disk); + + pr_info("n64cart: %u kb disk\n", size / 1024); + + return 0; +fail_dma: + kfree(buf); +fail_queue: + blk_cleanup_queue(queue); +fail_reg: + unregister_blkdev(major, "n64cart"); + return err; +} + +module_param(start, uint, 0); +MODULE_PARM_DESC(start, "Start address of the cart block data"); + +module_param(size, uint, 0); +MODULE_PARM_DESC(size, "Size of the cart block data, in bytes"); + +module_init(n64cart_init); =2D- 2.6.2