From patchwork Fri Jan 22 09:00:43 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lauri Kasanen X-Patchwork-Id: 12039359 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=-10.7 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,URIBL_BLOCKED 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 0F4FEC43333 for ; Fri, 22 Jan 2021 12:36:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D523B23444 for ; Fri, 22 Jan 2021 12:36:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726277AbhAVJYV (ORCPT ); Fri, 22 Jan 2021 04:24:21 -0500 Received: from mout.gmx.net ([212.227.17.22]:36543 "EHLO mout.gmx.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727231AbhAVJBb (ORCPT ); Fri, 22 Jan 2021 04:01:31 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=gmx.net; s=badeba3b8450; t=1611305943; bh=Jn2HLHgy7puBmLIYHyrR5S1r1N524W2YQYjGL8NAK0E=; h=X-UI-Sender-Class:Date:From:To:Cc:Subject; b=cxHj4W+38X8u8hsBE6tizkzhEHxpcF/PW1LLfnZEpV8pYL8SJsnfULEtUs0gMrnSj I8SwCWH9nvOgemekv+VtS13qHAUXZD2Py5bA5IGdBu+77L6/HTlXWpXGI/n5dx0sQb XmTAyvlTHIRP4hEqreHJ38t8GxpJ2H8XfutpVBzE= X-UI-Sender-Class: 01bb95c1-4bf8-414a-932a-4f6e2808ef9c Received: from Valinor ([82.203.161.65]) by mail.gmx.net (mrgmx105 [212.227.17.174]) with ESMTPSA (Nemesis) id 1MAOJP-1l9Ese1FKV-00BpNE; Fri, 22 Jan 2021 09:59:03 +0100 Date: Fri, 22 Jan 2021 11:00:43 +0200 From: Lauri Kasanen To: linux-mips@vger.kernel.org Cc: tsbogend@alpha.franken.de, axboe@kernel.dk, linux-block@vger.kernel.org, Keith Busch , Christoph Hellwig Subject: [PATCH v9] block: Add n64 cart driver Message-Id: <20210122110043.f36cd22df1233754753518c1@gmx.com> X-Mailer: Sylpheed 3.5.0 (GTK+ 2.18.6; x86_64-unknown-linux-gnu) Mime-Version: 1.0 X-Provags-ID: V03:K1:NShdB10bvAc9MjnIXCvw9SU23hsu0sEyJJCNrbCFyNVrDIT9FkX ftzea1D8BuKdngBMFma42AG8PJr0svrxRpYDDNfdRTwXayJ0KcNJYcF1PScn1aZG9spa/+8 LmnvP2ypPs4Cqw2InR8669DlAK2yrbAHS49T8r8CCPFrozF7lAAat0R4Hmp16xvx2z3gdYU BDxuichlt48TycnPfW1SA== X-UI-Out-Filterresults: notjunk:1;V03:K0:Jx6YBZsP/oo=:EBn6HxMMX5j24rDZBL3JbG ZztGtS11zcpeYpHew31aTDjSYwYwdmpTUTUXmwJWC4Gi4fNWVv74KSCP3BAEBcgdqkrKrz/Gg mdGUlH6VHNQrgZNRhKG+iuUw8Z4FrM6AEf1InQU9xelbJHoQ3lNN6plEXbKg3ogZvLC9jog3b 0UTGn3BFxAKO6Vk+yoRiM5FuzZXUoX0b1p2nKltRBmgo5w0SZajHhAL7z/euduOdF1coJAhkm 2sz/yem6gugo254G4RFCVScX7KkgDxL0dA7F6dqORCB//74KX24z0oJADpcOqdirCtQq8v7Do HAHhkboE6+orcoaEhLhqVEVt6z4rGjNZYjP/1MXD6HgQ8EjAiVu5QAhNG66LviCNxIQRpwaYL hh6LQFwEDGj/JdBTPmUJG30cOSQGsHzpaR4n0MJFVLpF1LWhdoeUUuvgAd2clvwYjbf44dYog QyegBe6WzlcY7ae788S1Q2gSjM5C405pphcyv6XBcACEbRYOXdzdyQ7q+y23bXfVXfZlhP4RI OrILjZ5j/zRrrVokzzE2FkJItrWOSGpgdsVDPyPaJ7xEcHy6ai/BmktGeHsGgq3jnbG64lHrA 0TTesba+5J9vh1F0fRFw1SKI4dfFc9UKmy0c327Bf8ymAUDg+McG4kz9nh+/tW+ozwezxrU8x 5wYEcPHUKW4b/R7otmiPKCC0vjWh5ZfBjdSnIMfypK71BFKGhsx1/MgdbS4PKYrge/KiwXrUV r/MlYHzsi0P2A7YPxvBlbbTy+PZayqO/FAwYBxozVbq10rDn2J6Nnwlq3Xnk7d1aeYky4fZDA 3UMyQBZYDnwPHahU9WNClEkkrWvRxrRhMkkZWwMBv9BDF3HRcUyR0P88yQY7JEojQqUFHPYTj V/G0uFJCgxdR6qILmpyQ== Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org This adds support for the Nintendo 64 console's carts. Carts are a read-only media ranging from 8mb to 64mb. Only one cart can be connected at once, and switching it requires a reboot. No module support to save RAM, as the target has 8mb RAM. Signed-off-by: Lauri Kasanen --- drivers/block/Kconfig | 6 ++ drivers/block/Makefile | 1 + drivers/block/n64cart.c | 211 ++++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 218 insertions(+) create mode 100644 drivers/block/n64cart.c v9: cosmetics min_t v8: SZ_64K remove barriers add defines for block domain constants __blk_mq_end_request remove register_blkdev via GENHD_FL_EXT_DEVT dma_alloc_noncoherent, sync -- 2.6.2 diff --git a/drivers/block/Kconfig b/drivers/block/Kconfig index ecceaaa..924d768 100644 --- 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 --- a/drivers/block/Makefile +++ b/drivers/block/Makefile @@ -17,6 +17,7 @@ obj-$(CONFIG_PS3_DISK) += ps3disk.o obj-$(CONFIG_PS3_VRAM) += ps3vram.o obj-$(CONFIG_ATARI_FLOPPY) += ataflop.o obj-$(CONFIG_AMIGA_Z2RAM) += z2ram.o +obj-$(CONFIG_N64CART) += n64cart.o obj-$(CONFIG_BLK_DEV_RAM) += brd.o obj-$(CONFIG_BLK_DEV_LOOP) += loop.o obj-$(CONFIG_XILINX_SYSACE) += xsysace.o diff --git a/drivers/block/n64cart.c b/drivers/block/n64cart.c new file mode 100644 index 0000000..01dd008 --- /dev/null +++ b/drivers/block/n64cart.c @@ -0,0 +1,211 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Support for the N64 cart. + * + * Copyright (c) 2021 Lauri Kasanen + */ + +#include +#include +#include +#include +#include +#include + +MODULE_AUTHOR("Lauri Kasanen "); +MODULE_DESCRIPTION("Driver for the N64 cart"); +MODULE_LICENSE("GPL"); + +#define BUFSIZE SZ_64K + +static unsigned int start, size; +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 u32 __iomem *reg_base; + +#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) + +#define CART_DOMAIN 0x10000000 +#define CART_MAX 0x1FFFFFFF + +static void n64cart_write_reg(const u8 reg, const u32 value) +{ + writel(value, reg_base + reg); +} + +static u32 n64cart_read_reg(const u8 reg) +{ + return 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)) + cpu_relax(); +} + +static blk_status_t n64cart_get_seg(struct request *req) +{ + u32 bstart = blk_rq_pos(req) * 512; + u32 len = blk_rq_cur_bytes(req); + void *dst = bio_data(req->bio); + + if (bstart + len > size) + return BLK_STS_IOERR; + + bstart += start; + + while (len) { + const u32 curlen = min_t(u32, len, BUFSIZE); + + dma_sync_single_for_device(disk_to_dev(disk), dma_addr, + BUFSIZE, DMA_FROM_DEVICE); + + n64cart_wait_dma(); + + n64cart_write_reg(PI_DRAM_REG, dma_addr); + n64cart_write_reg(PI_CART_REG, + (bstart | CART_DOMAIN) & CART_MAX); + n64cart_write_reg(PI_WRITE_REG, curlen - 1); + + n64cart_wait_dma(); + + dma_sync_single_for_cpu(disk_to_dev(disk), dma_addr, + BUFSIZE, DMA_FROM_DEVICE); + + memcpy(dst, buf, curlen); + + len -= curlen; + dst += curlen; + bstart += 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) +{ + struct request *req = bd->rq; + blk_status_t err; + + blk_mq_start_request(req); + + do { + err = n64cart_get_seg(req); + } while (blk_update_request(req, err, blk_rq_cur_bytes(req))); + + __blk_mq_end_request(req, BLK_STS_OK); + return BLK_STS_OK; +} + +static const struct blk_mq_ops n64cart_mq_ops = { + .queue_rq = n64cart_queue_rq, +}; + +static const struct block_device_operations n64cart_fops = { + .owner = THIS_MODULE, +}; + +/* + * The target device is embedded and RAM-constrained. We save RAM + * by initializing in __init code that gets dropped late in boot. + * For the same reason there is no module or unloading support. + */ +static int __init n64cart_probe(struct platform_device *pdev) +{ + 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; + } + + queue = blk_mq_init_sq_queue(&tag_set, &n64cart_mq_ops, 1, + BLK_MQ_F_SHOULD_MERGE | BLK_MQ_F_BLOCKING); + if (IS_ERR(queue)) { + return PTR_ERR(queue); + } + + buf = dma_alloc_noncoherent(&pdev->dev, BUFSIZE, &dma_addr, + DMA_FROM_DEVICE, GFP_KERNEL); + if (!buf) { + err = -ENOMEM; + goto fail_queue; + } + + reg_base = devm_platform_ioremap_resource(pdev, 0); + if (!reg_base) { + err = -EINVAL; + goto fail_dma; + } + + disk = alloc_disk(0); + if (!disk) { + err = -ENOMEM; + goto fail_dma; + } + + disk->first_minor = 0; + disk->queue = queue; + disk->flags = GENHD_FL_NO_PART_SCAN | GENHD_FL_EXT_DEVT; + disk->fops = &n64cart_fops; + strcpy(disk->disk_name, "n64cart"); + + set_capacity(disk, size / 512); + set_disk_ro(disk, 1); + + 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: + dma_free_noncoherent(&pdev->dev, BUFSIZE, buf, dma_addr, + DMA_FROM_DEVICE); +fail_queue: + blk_cleanup_queue(queue); + + return err; +} + +static struct platform_driver n64cart_driver = { + .driver = { + .name = "n64cart", + }, +}; + +static int __init n64cart_init(void) +{ + return platform_driver_probe(&n64cart_driver, n64cart_probe); +} + +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);