From patchwork Fri Jan 15 11:34:08 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lauri Kasanen X-Patchwork-Id: 12022315 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=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 CDE82C433E0 for ; Fri, 15 Jan 2021 11:38:03 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9CC792371F for ; Fri, 15 Jan 2021 11:38:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725831AbhAOLht (ORCPT ); Fri, 15 Jan 2021 06:37:49 -0500 Received: from mout.gmx.net ([212.227.17.22]:40015 "EHLO mout.gmx.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727111AbhAOLhs (ORCPT ); Fri, 15 Jan 2021 06:37:48 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=gmx.net; s=badeba3b8450; t=1610710574; bh=55sDbgjHyH8OG315mZEvs58fDlVnogA73v0CgNMYFNU=; h=X-UI-Sender-Class:Date:From:To:Cc:Subject; b=SNvAfgWmxCiyojhT+hjadMxkr5i7oPwicB0MQFYxFpZuRU7VWHEigl2cZwL2nRJoR gEncibaLyvJhERY+TQX6GBu7EWT2TyP4itGeh2zDDW1xwVBaSuPeUF45OdfaNmXnm3 WYGI7ukwQkEvSZGCYcjFBo6wslNHbPwNaCclWbhM= X-UI-Sender-Class: 01bb95c1-4bf8-414a-932a-4f6e2808ef9c Received: from Valinor ([82.203.161.65]) by mail.gmx.com (mrgmx104 [212.227.17.174]) with ESMTPSA (Nemesis) id 1MuDbx-1luFu43eDV-00uYfW; Fri, 15 Jan 2021 12:36:14 +0100 Date: Fri, 15 Jan 2021 13:34:08 +0200 From: Lauri Kasanen To: linux-mips@vger.kernel.org Cc: tsbogend@alpha.franken.de, dmitry.torokhov@gmail.com, linux-input@vger.kernel.org Subject: [PATCH 1/3 v7] input: Add N64 controller driver Message-Id: <20210115133408.0acd70163b582b77ad0a029b@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:K1:2n5fsYMnt8EyAwDKwstxuW4GQI57ALAzkmwEeLoWaBC7fzxp0vr mzcBhHKta9cl+D6d2deCaCQAesq44gRBmqy8SxX/YV+n5eWUt23HJPoj+eo4eyjkzoBq3gq ZS/r/of18Jj2CP0U5HpYavhLtKUoDHysMu75/df4Q8egolBXy/AVd3BaFm660cZFWph5Rf/ /WeLCP8xLAQcgrVAs3Svg== X-UI-Out-Filterresults: notjunk:1;V03:K0:rjOUcP5Zqec=:NA2JNUhrip5ykat5DRdpzm zi9U+BPGy7uCU5n3X0PcWJaCseMzfjWvw5MgX6jAqLfqePcuFFurpDDqD7eNQ22Uz+xDPGVta ci7XnWBz/JcAJ8M9r7NtOeGvpbXonR0iiBPT/Xizo9Se1i42c5Bzamz2J6GomiXg3t5kMSRiF h+tIBOtqnP4CXrNwLRyIC9ryrUTPZE1MnhpydT2t15mKBXWCjwJGHKLI80nDR5DKPy79XYj2N 8v20yUZQDv0maLV90eym6N9CV8jSM125vuTBxl9Bb1LSTswPYhU2IRFSrIjvff+wEsLE4epeu 1CU8z+DxLstTzycLzVqZiFZewyEPz159v0+Lwu4H1DyjIivMfbKrCZv7RtITCPdnEOcUhvx7S IydN49nfPcgAt+KhXm8DsEuAfWPP2t5mf+ztoSrGpcrZYe820ktq5yw5ECBUekWJfKE3f12Ph ttG6ZorkyJ2D9Ywknqwp1XWcf0e1ykQvZ/zqaPGoObD37xkfR0qB3e2khVJtWjuUpZazImig0 l/yHQQJUOjbgwf6WPhuLUYO+lK2lYdxZPaGZfX7suVu0H14WZe1sPj1qMhCHhu0nfMC59okL+ 2FXeJ5V/D7LcazThX35VQFO1tiK+yUOqezsBliBSMh6Bf0GWXd+Zcdm/+7yCA1n1K2uGDrtY0 uQbGqDN/wbk4PBLt94qehaftF9BV88FIlKogNzUCtcMZq2iNM9rRtd6pjTCAxEwRlGRc70Oi6 rXpE0c7+deTmOT4KaCPO4uAev49tlvDcuEcb4wUfQf/g+S30R9FwPFBvPdMDQnmd4pqZDubXS IW43PFpDND2llg4uWIhsa4RAfQKRqv/KG1hg0rETcDV13QiVzhh996ZGgLPW8UaCRn2V+ADRi iR/Gw8FEXXfqH1HC+aXg== Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org This adds support for the four built-in controller ports on the Nintendo 64 console. The N64 controller includes an analog stick, a d-pad, and several buttons. No module support as the target has only 8mb ram. Signed-off-by: Lauri Kasanen --- v7: use devm_platform_ioremap_resource drivers/input/joystick/Kconfig | 6 + drivers/input/joystick/Makefile | 2 +- drivers/input/joystick/n64joy.c | 343 ++++++++++++++++++++++++++++++++++++++++ 3 files changed, 350 insertions(+), 1 deletion(-) create mode 100644 drivers/input/joystick/n64joy.c -- 2.6.2 diff --git a/drivers/input/joystick/Kconfig b/drivers/input/joystick/Kconfig index b080f0c..e1a8128 100644 --- a/drivers/input/joystick/Kconfig +++ b/drivers/input/joystick/Kconfig @@ -382,4 +382,10 @@ config JOYSTICK_FSIA6B To compile this driver as a module, choose M here: the module will be called fsia6b. +config JOYSTICK_N64 + bool "N64 controller" + depends on MACH_NINTENDO64 + help + Support for the four N64 controllers. + endif diff --git a/drivers/input/joystick/Makefile b/drivers/input/joystick/Makefile index 58232b3..31d720c 100644 --- a/drivers/input/joystick/Makefile +++ b/drivers/input/joystick/Makefile @@ -24,6 +24,7 @@ obj-$(CONFIG_JOYSTICK_INTERACT) += interact.o obj-$(CONFIG_JOYSTICK_JOYDUMP) += joydump.o obj-$(CONFIG_JOYSTICK_MAGELLAN) += magellan.o obj-$(CONFIG_JOYSTICK_MAPLE) += maplecontrol.o +obj-$(CONFIG_JOYSTICK_N64) += n64joy.o obj-$(CONFIG_JOYSTICK_PSXPAD_SPI) += psxpad-spi.o obj-$(CONFIG_JOYSTICK_PXRC) += pxrc.o obj-$(CONFIG_JOYSTICK_SIDEWINDER) += sidewinder.o @@ -37,4 +38,3 @@ obj-$(CONFIG_JOYSTICK_WARRIOR) += warrior.o obj-$(CONFIG_JOYSTICK_WALKERA0701) += walkera0701.o obj-$(CONFIG_JOYSTICK_XPAD) += xpad.o obj-$(CONFIG_JOYSTICK_ZHENHUA) += zhenhua.o - diff --git a/drivers/input/joystick/n64joy.c b/drivers/input/joystick/n64joy.c new file mode 100644 index 0000000..a4bb247 --- /dev/null +++ b/drivers/input/joystick/n64joy.c @@ -0,0 +1,343 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Support for the four N64 controllers. + * + * Copyright (c) 2021 Lauri Kasanen + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +MODULE_AUTHOR("Lauri Kasanen "); +MODULE_DESCRIPTION("Driver for N64 controllers"); +MODULE_LICENSE("GPL"); + +#define PIF_RAM 0x1fc007c0 + +#define SI_DRAM_REG 0 +#define SI_READ_REG 1 +#define SI_WRITE_REG 4 +#define SI_STATUS_REG 6 + +#define SI_STATUS_DMA_BUSY BIT(0) +#define SI_STATUS_IO_BUSY BIT(1) + +#define N64_CONTROLLER_ID 0x0500 + +#define MAX_CONTROLLERS 4 + +static const char *n64joy_phys[MAX_CONTROLLERS] = { + "n64joy/port0", + "n64joy/port1", + "n64joy/port2", + "n64joy/port3", +}; + +struct n64joy_priv { + u64 si_buf[8] ____cacheline_aligned; + struct timer_list timer; + struct mutex n64joy_mutex; + struct input_dev *n64joy_dev[MAX_CONTROLLERS]; + u32 __iomem *reg_base; + u8 n64joy_opened; +}; + +struct joydata { + unsigned: 16; // unused + unsigned err: 2; + unsigned: 14; // unused + + union { + u32 data; + + struct { + unsigned a: 1; + unsigned b: 1; + unsigned z: 1; + unsigned start: 1; + unsigned up: 1; + unsigned down: 1; + unsigned left: 1; + unsigned right: 1; + unsigned: 2; // unused + unsigned l: 1; + unsigned r: 1; + unsigned c_up: 1; + unsigned c_down: 1; + unsigned c_left: 1; + unsigned c_right: 1; + signed x: 8; + signed y: 8; + }; + }; +}; + +static void n64joy_write_reg(u32 __iomem *reg_base, const u8 reg, const u32 value) +{ + writel(value, reg_base + reg); +} + +static u32 n64joy_read_reg(u32 __iomem *reg_base, const u8 reg) +{ + return readl(reg_base + reg); +} + +static void n64joy_wait_si_dma(u32 __iomem *reg_base) +{ + while (n64joy_read_reg(reg_base, SI_STATUS_REG) & + (SI_STATUS_DMA_BUSY | SI_STATUS_IO_BUSY)) + cpu_relax(); +} + +static void n64joy_exec_pif(struct n64joy_priv *priv, const u64 in[8]) +{ + unsigned long flags; + + dma_cache_wback_inv((unsigned long) in, 8 * 8); + dma_cache_inv((unsigned long) priv->si_buf, 8 * 8); + + local_irq_save(flags); + + n64joy_wait_si_dma(priv->reg_base); + + barrier(); + n64joy_write_reg(priv->reg_base, SI_DRAM_REG, virt_to_phys(in)); + barrier(); + n64joy_write_reg(priv->reg_base, SI_WRITE_REG, PIF_RAM); + barrier(); + + n64joy_wait_si_dma(priv->reg_base); + + barrier(); + n64joy_write_reg(priv->reg_base, SI_DRAM_REG, virt_to_phys(priv->si_buf)); + barrier(); + n64joy_write_reg(priv->reg_base, SI_READ_REG, PIF_RAM); + barrier(); + + n64joy_wait_si_dma(priv->reg_base); + + local_irq_restore(flags); +} + +static const u64 polldata[] ____cacheline_aligned = { + 0xff010401ffffffff, + 0xff010401ffffffff, + 0xff010401ffffffff, + 0xff010401ffffffff, + 0xfe00000000000000, + 0, + 0, + 1 +}; + +static void n64joy_poll(struct timer_list *t) +{ + const struct joydata *data; + struct n64joy_priv *priv = container_of(t, struct n64joy_priv, timer); + struct input_dev *dev; + u32 i; + + n64joy_exec_pif(priv, polldata); + + data = (struct joydata *) priv->si_buf; + + for (i = 0; i < MAX_CONTROLLERS; i++) { + if (!priv->n64joy_dev[i]) + continue; + + dev = priv->n64joy_dev[i]; + + // d-pad + input_report_key(dev, BTN_DPAD_UP, data[i].up); + input_report_key(dev, BTN_DPAD_DOWN, data[i].down); + input_report_key(dev, BTN_DPAD_LEFT, data[i].left); + input_report_key(dev, BTN_DPAD_RIGHT, data[i].right); + + // c buttons + input_report_key(dev, BTN_FORWARD, data[i].c_up); + input_report_key(dev, BTN_BACK, data[i].c_down); + input_report_key(dev, BTN_LEFT, data[i].c_left); + input_report_key(dev, BTN_RIGHT, data[i].c_right); + + // matching buttons + input_report_key(dev, BTN_START, data[i].start); + input_report_key(dev, BTN_Z, data[i].z); + + // remaining ones: a, b, l, r + input_report_key(dev, BTN_0, data[i].a); + input_report_key(dev, BTN_1, data[i].b); + input_report_key(dev, BTN_2, data[i].l); + input_report_key(dev, BTN_3, data[i].r); + + input_report_abs(dev, ABS_X, data[i].x); + input_report_abs(dev, ABS_Y, data[i].y); + + input_sync(dev); + } + + mod_timer(&priv->timer, jiffies + msecs_to_jiffies(16)); +} + +static int n64joy_open(struct input_dev *dev) +{ + struct n64joy_priv *priv = input_get_drvdata(dev); + int err; + + err = mutex_lock_interruptible(&priv->n64joy_mutex); + if (err) + return err; + + if (!priv->n64joy_opened) { + // Could use the vblank irq, but it's not important if the poll + // point slightly changes. + timer_setup(&priv->timer, n64joy_poll, 0); + mod_timer(&priv->timer, jiffies + msecs_to_jiffies(16)); + } + + priv->n64joy_opened++; + + mutex_unlock(&priv->n64joy_mutex); + return err; +} + +static void n64joy_close(struct input_dev *dev) +{ + struct n64joy_priv *priv = input_get_drvdata(dev); + + mutex_lock(&priv->n64joy_mutex); + if (!--priv->n64joy_opened) + del_timer_sync(&priv->timer); + mutex_unlock(&priv->n64joy_mutex); +} + +static const u64 __initconst scandata[] ____cacheline_aligned = { + 0xff010300ffffffff, + 0xff010300ffffffff, + 0xff010300ffffffff, + 0xff010300ffffffff, + 0xfe00000000000000, + 0, + 0, + 1 +}; + +/* + * 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 n64joy_probe(struct platform_device *pdev) +{ + const struct joydata *data; + struct n64joy_priv *priv; + struct input_dev *dev; + int err = 0; + u32 i, j, found = 0; + + priv = kzalloc(sizeof(struct n64joy_priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + mutex_init(&priv->n64joy_mutex); + + priv->reg_base = devm_platform_ioremap_resource(pdev, 0); + if (!priv->reg_base) { + err = -EINVAL; + goto fail; + } + + // The controllers are not hotpluggable, so we can scan in init + n64joy_exec_pif(priv, scandata); + + data = (struct joydata *) priv->si_buf; + + for (i = 0; i < MAX_CONTROLLERS; i++) { + if (!data[i].err && data[i].data >> 16 == N64_CONTROLLER_ID) { + found++; + + dev = priv->n64joy_dev[i] = input_allocate_device(); + if (!priv->n64joy_dev[i]) { + err = -ENOMEM; + goto fail; + } + + input_set_drvdata(dev, priv); + + dev->name = "N64 controller"; + dev->phys = n64joy_phys[i]; + dev->id.bustype = BUS_HOST; + dev->id.vendor = 0; + dev->id.product = data[i].data >> 16; + dev->id.version = 0; + + dev->open = n64joy_open; + dev->close = n64joy_close; + + // d-pad + input_set_capability(dev, EV_KEY, BTN_DPAD_UP); + input_set_capability(dev, EV_KEY, BTN_DPAD_DOWN); + input_set_capability(dev, EV_KEY, BTN_DPAD_LEFT); + input_set_capability(dev, EV_KEY, BTN_DPAD_RIGHT); + // c buttons + input_set_capability(dev, EV_KEY, BTN_LEFT); + input_set_capability(dev, EV_KEY, BTN_RIGHT); + input_set_capability(dev, EV_KEY, BTN_FORWARD); + input_set_capability(dev, EV_KEY, BTN_BACK); + // matching buttons + input_set_capability(dev, EV_KEY, BTN_START); + input_set_capability(dev, EV_KEY, BTN_Z); + // remaining ones: a, b, l, r + input_set_capability(dev, EV_KEY, BTN_0); + input_set_capability(dev, EV_KEY, BTN_1); + input_set_capability(dev, EV_KEY, BTN_2); + input_set_capability(dev, EV_KEY, BTN_3); + + for (j = 0; j < 2; j++) { + input_set_abs_params(dev, ABS_X + j, + S8_MIN, S8_MAX, 0, 0); + } + + err = input_register_device(dev); + if (err) { + input_free_device(dev); + goto fail; + } + } + } + + pr_info("%u controller(s) connected\n", found); + + if (!found) + return -ENODEV; + + return 0; +fail: + for (i = 0; i < MAX_CONTROLLERS; i++) { + if (!priv->n64joy_dev[i]) + continue; + input_unregister_device(priv->n64joy_dev[i]); + } + return err; +} + +static struct platform_driver n64joy_driver = { + .driver = { + .name = "n64joy", + }, +}; + +static int __init n64joy_init(void) +{ + return platform_driver_probe(&n64joy_driver, n64joy_probe); +} + +module_init(n64joy_init); From patchwork Fri Jan 15 11:35:00 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lauri Kasanen X-Patchwork-Id: 12022319 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=-7.9 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 51127C433DB for ; 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Fri, 15 Jan 2021 12:36:15 +0100 Date: Fri, 15 Jan 2021 13:35:00 +0200 From: Lauri Kasanen To: linux-mips@vger.kernel.org Cc: tsbogend@alpha.franken.de, Takashi Iwai , perex@perex.cz Subject: [PATCH 2/3 v7] sound: Add n64 driver Message-Id: <20210115133500.c5affc0131313e1165acb2a1@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:jGSx8WMqNwe6NCIIDXiaMlbJUFrsm3D5a41pIIy09riqPaBJcIU JsJx5fRe5kteFAu1UFJbgZCQ3gAOFMabl5/o+v5TK92GvvAVyosPOHlNYOsS8OM165LIaxC 9Wsenju29GPnUgUriAIsKxSb2mCT31COjuSOMdAXEu78EunCqKHczEdQhD1+DL1TpCu/FgZ 7WzVfi0hsT40CmdDq0S0Q== X-UI-Out-Filterresults: notjunk:1;V03:K0:GTcLADRFUXg=:Ksc5PQPgBYcHriQawRhtL9 A6SBiA0zoifUGfVLw02L7Nt3lGveRPKPmij910+R6CDRDGaILH+k/OBJLcsUpd6ztQmM2ObH3 EWNfV2eP/hTrcFc3LxUdHajdh89583hzGGMv0pSMEwNifGRb5kh1p2oqAhIkN+0LFZaWrV8Hq DbsI7AYHRXKC5a0QcQneLwvSmPYkIuuQWaF7JtG6WQLo6Gwyiv0O2EpkNYy7SWMAq24qZxibt 4PW1OkAgGneA//KFFwSUpTIPUzojTflQfJQg2EAfu7DiCashA+k9GEg7AVywqbsvrNeg4QSFN 4VDvXZN3UQgpj83bDm7w2qaZXNCMzjllhAGgb7XYP1Sf8Vn5yErPTq1dER0a9e+T4iay4zhkY LvWwY/UBO1aODYLmsLw+rzKNLDJszGX6aoQvLyl5UOFWTY63fo0mHdE92bC10uHq9iwqikmB+ 5sp2xIYZ87hD7Fhb9Rao4R8sJoQ3O2Fi50WGC5klijoCneqH9S5rap2+cv781QXy02kbrdvkv ZAPD3EOoipiZfzy77EQmXXqwzTSsAQqVAXshJeLptSkmUQAUxVgvgEGGeuahAd0TNNZ7UoLGM y5PPDNnVwRaD6Zx8iqLu5F/QT5w+nyvUEpDyCd+CgXtPRUzJneFNcUWkrOVcj1boVoq5B7Ynt lKAKtsUYfnM59JeAP36npiTblDKB3cakbr309FSsqG7he6CQrXyaIYB1TA0XAKTb00ZtFziXv bZguaGYwu0zKpt64Mk/6GePCMWF8Id6gnsPv2bThquFCwpEFgQmXtYRbE/mBdf9gMlm+nUUCT /5ItJb2sjMvo6mvi/Fqgs2CfadQP2KXWpOzCdY4W4m+XBdyGag6R2IThy1XBDBoCgF6IqtfbY co7kHFvJvhLcvqsR8DBA== Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org This adds support for the Nintendo 64 console's sound. Signed-off-by: Lauri Kasanen Reviewed-by: Takashi Iwai --- v7: use devm_* sound/mips/Kconfig | 7 + sound/mips/Makefile | 1 + sound/mips/snd-n64.c | 372 +++++++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 380 insertions(+) create mode 100644 sound/mips/snd-n64.c -- 2.6.2 diff --git a/sound/mips/Kconfig b/sound/mips/Kconfig index b497b80..c484b1e 100644 --- a/sound/mips/Kconfig +++ b/sound/mips/Kconfig @@ -24,5 +24,12 @@ config SND_SGI_HAL2 help Sound support for the SGI Indy and Indigo2 Workstation. +config SND_N64 + bool "N64 Audio" + depends on MACH_NINTENDO64 && SND=y + select SND_PCM + help + Sound support for the N64. + endif # SND_MIPS diff --git a/sound/mips/Makefile b/sound/mips/Makefile index ccc364e..7c86268 100644 --- a/sound/mips/Makefile +++ b/sound/mips/Makefile @@ -9,3 +9,4 @@ snd-sgi-hal2-objs := hal2.o # Toplevel Module Dependency obj-$(CONFIG_SND_SGI_O2) += snd-sgi-o2.o obj-$(CONFIG_SND_SGI_HAL2) += snd-sgi-hal2.o +obj-$(CONFIG_SND_N64) += snd-n64.o diff --git a/sound/mips/snd-n64.c b/sound/mips/snd-n64.c new file mode 100644 index 0000000..ca6b4b9 --- /dev/null +++ b/sound/mips/snd-n64.c @@ -0,0 +1,372 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Sound driver for Nintendo 64. + * + * Copyright 2021 Lauri Kasanen + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include +#include + +MODULE_AUTHOR("Lauri Kasanen "); +MODULE_DESCRIPTION("N64 Audio"); +MODULE_LICENSE("GPL"); + +#define AI_NTSC_DACRATE 48681812 +#define AI_STATUS_BUSY (1 << 30) +#define AI_STATUS_FULL (1 << 31) + +#define AI_ADDR_REG 0 +#define AI_LEN_REG 1 +#define AI_CONTROL_REG 2 +#define AI_STATUS_REG 3 +#define AI_RATE_REG 4 +#define AI_BITCLOCK_REG 5 + +#define MI_INTR_REG 2 +#define MI_MASK_REG 3 + +#define MI_INTR_AI 0x04 + +#define MI_MASK_CLR_AI 0x0010 +#define MI_MASK_SET_AI 0x0020 + + +struct n64audio { + u32 __iomem *ai_reg_base; + u32 __iomem *mi_reg_base; + + void *ring_base; + dma_addr_t ring_base_dma; + + struct snd_card *card; + + struct { + struct snd_pcm_substream *substream; + int pos, nextpos; + u32 writesize; + u32 bufsize; + spinlock_t lock; + } chan; +}; + +static void n64audio_write_reg(struct n64audio *priv, const u8 reg, const u32 value) +{ + writel(value, priv->ai_reg_base + reg); +} + +static void n64mi_write_reg(struct n64audio *priv, const u8 reg, const u32 value) +{ + writel(value, priv->mi_reg_base + reg); +} + +static u32 n64mi_read_reg(struct n64audio *priv, const u8 reg) +{ + return readl(priv->mi_reg_base + reg); +} + +static void n64audio_push(struct n64audio *priv) +{ + struct snd_pcm_runtime *runtime = priv->chan.substream->runtime; + unsigned long flags; + u32 count; + + spin_lock_irqsave(&priv->chan.lock, flags); + + count = priv->chan.writesize; + + memcpy(priv->ring_base + priv->chan.nextpos, + runtime->dma_area + priv->chan.nextpos, count); + + /* + * The hw registers are double-buffered, and the IRQ fires essentially + * one period behind. The core only allows one period's distance, so we + * keep a private DMA buffer to afford two. + */ + n64audio_write_reg(priv, AI_ADDR_REG, priv->ring_base_dma + priv->chan.nextpos); + barrier(); + n64audio_write_reg(priv, AI_LEN_REG, count); + + priv->chan.nextpos += count; + priv->chan.nextpos %= priv->chan.bufsize; + + runtime->delay = runtime->period_size; + + spin_unlock_irqrestore(&priv->chan.lock, flags); +} + +static irqreturn_t n64audio_isr(int irq, void *dev_id) +{ + struct n64audio *priv = dev_id; + const u32 intrs = n64mi_read_reg(priv, MI_INTR_REG); + unsigned long flags; + + // Check it's ours + if (!(intrs & MI_INTR_AI)) + return IRQ_NONE; + + n64audio_write_reg(priv, AI_STATUS_REG, 1); + + if (priv->chan.substream && snd_pcm_running(priv->chan.substream)) { + spin_lock_irqsave(&priv->chan.lock, flags); + + priv->chan.pos = priv->chan.nextpos; + + spin_unlock_irqrestore(&priv->chan.lock, flags); + + snd_pcm_period_elapsed(priv->chan.substream); + if (priv->chan.substream && snd_pcm_running(priv->chan.substream)) + n64audio_push(priv); + } + + return IRQ_HANDLED; +} + +static const struct snd_pcm_hardware n64audio_pcm_hw = { + .info = (SNDRV_PCM_INFO_MMAP | + SNDRV_PCM_INFO_MMAP_VALID | + SNDRV_PCM_INFO_INTERLEAVED | + SNDRV_PCM_INFO_BLOCK_TRANSFER), + .formats = SNDRV_PCM_FMTBIT_S16_BE, + .rates = SNDRV_PCM_RATE_8000_48000, + .rate_min = 8000, + .rate_max = 48000, + .channels_min = 2, + .channels_max = 2, + .buffer_bytes_max = 32768, + .period_bytes_min = 1024, + .period_bytes_max = 32768, + .periods_min = 3, + // 3 periods lets the double-buffering hw read one buffer behind safely + .periods_max = 128, +}; + +static int hw_rule_period_size(struct snd_pcm_hw_params *params, + struct snd_pcm_hw_rule *rule) +{ + struct snd_interval *c = hw_param_interval(params, + SNDRV_PCM_HW_PARAM_PERIOD_SIZE); + int changed = 0; + + /* + * The DMA unit has errata on (start + len) & 0x3fff == 0x2000. + * This constraint makes sure that the period size is not a power of two, + * which combined with dma_alloc_coherent aligning the buffer to the largest + * PoT <= size guarantees it won't be hit. + */ + + if (is_power_of_2(c->min)) { + c->min += 2; + changed = 1; + } + if (is_power_of_2(c->max)) { + c->max -= 2; + changed = 1; + } + if (snd_interval_checkempty(c)) { + c->empty = 1; + return -EINVAL; + } + + return changed; +} + +static int n64audio_pcm_open(struct snd_pcm_substream *substream) +{ + struct snd_pcm_runtime *runtime = substream->runtime; + int err; + + runtime->hw = n64audio_pcm_hw; + err = snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS); + if (err < 0) + return err; + + err = snd_pcm_hw_constraint_step(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2); + if (err < 0) + return err; + + err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, + hw_rule_period_size, NULL, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); + if (err < 0) + return err; + + return 0; +} + +static int n64audio_pcm_prepare(struct snd_pcm_substream *substream) +{ + struct snd_pcm_runtime *runtime = substream->runtime; + struct n64audio *priv = substream->pcm->private_data; + u32 rate; + + rate = ((2 * AI_NTSC_DACRATE / runtime->rate) + 1) / 2 - 1; + + n64audio_write_reg(priv, AI_RATE_REG, rate); + + rate /= 66; + if (rate > 16) + rate = 16; + n64audio_write_reg(priv, AI_BITCLOCK_REG, rate - 1); + + spin_lock_irq(&priv->chan.lock); + + /* Setup the pseudo-dma transfer pointers. */ + priv->chan.pos = 0; + priv->chan.nextpos = 0; + priv->chan.substream = substream; + priv->chan.writesize = snd_pcm_lib_period_bytes(substream); + priv->chan.bufsize = snd_pcm_lib_buffer_bytes(substream); + + spin_unlock_irq(&priv->chan.lock); + return 0; +} + +static int n64audio_pcm_trigger(struct snd_pcm_substream *substream, + int cmd) +{ + struct n64audio *priv = substream->pcm->private_data; + + switch (cmd) { + case SNDRV_PCM_TRIGGER_START: + n64audio_push(substream->pcm->private_data); + n64audio_write_reg(priv, AI_CONTROL_REG, 1); + n64mi_write_reg(priv, MI_MASK_REG, MI_MASK_SET_AI); + break; + case SNDRV_PCM_TRIGGER_STOP: + n64audio_write_reg(priv, AI_CONTROL_REG, 0); + n64mi_write_reg(priv, MI_MASK_REG, MI_MASK_CLR_AI); + break; + default: + return -EINVAL; + } + return 0; +} + +static snd_pcm_uframes_t n64audio_pcm_pointer(struct snd_pcm_substream *substream) +{ + struct n64audio *priv = substream->pcm->private_data; + + return bytes_to_frames(substream->runtime, + priv->chan.pos); +} + +static int n64audio_pcm_close(struct snd_pcm_substream *substream) +{ + struct n64audio *priv = substream->pcm->private_data; + + priv->chan.substream = NULL; + + return 0; +} + +static const struct snd_pcm_ops n64audio_pcm_ops = { + .open = n64audio_pcm_open, + .prepare = n64audio_pcm_prepare, + .trigger = n64audio_pcm_trigger, + .pointer = n64audio_pcm_pointer, + .close = n64audio_pcm_close, +}; + +/* + * 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 n64audio_probe(struct platform_device *pdev) +{ + struct snd_card *card; + struct snd_pcm *pcm; + struct n64audio *priv; + struct resource *res; + int err; + + err = snd_card_new(&pdev->dev, SNDRV_DEFAULT_IDX1, + SNDRV_DEFAULT_STR1, + THIS_MODULE, sizeof(*priv), &card); + if (err < 0) + return err; + + priv = card->private_data; + + spin_lock_init(&priv->chan.lock); + + priv->card = card; + + priv->ring_base = dma_alloc_coherent(card->dev, 32 * 1024, &priv->ring_base_dma, + GFP_DMA|GFP_KERNEL); + if (!priv->ring_base) { + err = -ENOMEM; + goto fail_card; + } + + priv->mi_reg_base = devm_platform_ioremap_resource(pdev, 0); + if (!priv->mi_reg_base) { + err = -EINVAL; + goto fail_dma_alloc; + } + + priv->ai_reg_base = devm_platform_ioremap_resource(pdev, 1); + if (!priv->ai_reg_base) { + err = -EINVAL; + goto fail_dma_alloc; + } + + err = snd_pcm_new(card, "N64 Audio", 0, 1, 0, &pcm); + if (err < 0) + goto fail_dma_alloc; + + pcm->private_data = priv; + strcpy(pcm->name, "N64 Audio"); + + snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &n64audio_pcm_ops); + snd_pcm_set_managed_buffer_all(pcm, SNDRV_DMA_TYPE_VMALLOC, card->dev, 0, 0); + + strcpy(card->driver, "N64 Audio"); + strcpy(card->shortname, "N64 Audio"); + strcpy(card->longname, "N64 Audio"); + + res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); + if (devm_request_irq(&pdev->dev, res->start, n64audio_isr, + IRQF_SHARED, "N64 Audio", priv)) { + err = -EBUSY; + goto fail_dma_alloc; + } + + err = snd_card_register(card); + if (err < 0) + goto fail_dma_alloc; + + return 0; + +fail_dma_alloc: + dma_free_coherent(card->dev, 32 * 1024, priv->ring_base, priv->ring_base_dma); + +fail_card: + snd_card_free(card); + return err; +} + +static struct platform_driver n64audio_driver = { + .driver = { + .name = "n64audio", + }, +}; + +static int __init n64audio_init(void) +{ + return platform_driver_probe(&n64audio_driver, n64audio_probe); +} + +module_init(n64audio_init); From patchwork Fri Jan 15 11:35:59 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lauri Kasanen X-Patchwork-Id: 12022317 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=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 32EFDC43381 for ; Fri, 15 Jan 2021 11:38:04 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0814323730 for ; Fri, 15 Jan 2021 11:38:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727111AbhAOLhz (ORCPT ); Fri, 15 Jan 2021 06:37:55 -0500 Received: from mout.gmx.net ([212.227.17.20]:46213 "EHLO mout.gmx.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726918AbhAOLhy (ORCPT ); Fri, 15 Jan 2021 06:37:54 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=gmx.net; s=badeba3b8450; t=1610710578; bh=6/R+MOPQf+TvFBrzGya2wMdpyErzbvc4ip6wJAtA1qk=; h=X-UI-Sender-Class:Date:From:To:Cc:Subject; b=Ry3Gq0ZUaC2BIMgYbKi2Wu0V2xsphgQy9e2gFTr6sZMTrcJYT7KkRDBOahJ8QQjh0 nt+yJyE/TTFOmPJbaz6uI7N1jYfBHvi3PxZ1KBasUtDHjrrcARRyYuud2IlJU4Ls3m npKsWEyOXxRRsQjqpcu02TZICoxShvMcDcCSgWuo= X-UI-Sender-Class: 01bb95c1-4bf8-414a-932a-4f6e2808ef9c Received: from Valinor ([82.203.161.65]) by mail.gmx.com (mrgmx105 [212.227.17.174]) with ESMTPSA (Nemesis) id 1MvsEx-1lsc102ls7-00syWy; Fri, 15 Jan 2021 12:36:17 +0100 Date: Fri, 15 Jan 2021 13:35:59 +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 Subject: [PATCH 3/3 v7] block: Add n64 cart driver Message-Id: <20210115133559.84b2997dc326c277c4d91503@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:ELM/U8DGftx+Y1TkG0B8k2n8mJVB718kbZbQv8COJJrrfjGlRWH z8jq1zAspSi6y2LFh5wWok9/LQCMqRbZsdwyvYtDDBSPT2lJiSW0C8oy3Mqs14gX2u5mTas GP97g4vLDtdotEO2/wqTfhvFgqm6PWGRDIRAcqrSJWpG13VS7QfwDJRSrFUiNhv16zDYGO/ P3EuoZeflondktEkN3YiQ== X-UI-Out-Filterresults: notjunk:1;V03:K0:hTHrhDxLB1Q=:1bYuyTiv30TVB2bgWsBPl6 pYeBndfMcWMf8o+klE3NyXKK1V7eEzuNYVPyGjgGpD4a03rZbtKEZRMW5PY9fsBMvqPfKoqhZ XtzpnxU66KWtdhiN8KfQ+Tym48qEW4mFtmE+DFZVmaHvaaeN/ZCk0TA87J8904rEK3fBHya5a fuVy5Gx/uAWrguEq1vFeFZw3ibGMt2DuCtnrOONER1zB+SseUYSjC8eKcjoiwgskTI04DnZdO 12Qon6lCl1HGESjphykPE7Z3s9P9fW18EV1fwSR9kkNZ99G1wp/koJigtDW2u6tZe3MyaZnlo GP9RnndkLAW8mzrKDUQaGrVX0m3HQ0eXNrWvmFlWZqBxuCUx0N4vT1JAKO/zao3vsMYf5/e34 gOZJRVxrBkgkYpFsGrik0z+FMzCw2Bw2soU78x0/mduKRO6DKhFSyl4VXGUA1pU98Hx4wxc9n 5ubKU3LYzfW++ok68kJJ15Kyl0UC0KYlB6w9KsSApUFiZnP65esUbE42oU1G5I7e2HAmejxz/ bOeIJChXqqKBGfwHuwizVZveIDxmfLrUmRgc8ShheabgC9cPHW4298i4uBrx77n39nEOZJ1G0 Zr3Y+nvCKJojESmxi4biZ/7RK/8EReT1vPS1pMM9r+0UMOkoQ37WV1w/gFGJNzqqMIk4Qq64e xuXa68nlHyf6gWXF9Lkr6/oqi2ASXH2m+eVgq54Pjp9bUYpyquX3NFLRgYhKwL69SIr3yfKHG uempujEpwSYX3kG3T+MwJfT53oGD0ZwbUPYK74GoP92eRzLUfLsEGSHDBHnNgD898bQL5+eCZ avosWcYMVCG33QLXDboy+NiI5h4FVWV2ZeEVSfPQIDZxdY38kmHie0m2I1eg2qslZ5Ez1VahX iYRW/hczU363UvM6MdDQ== 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 --- v7: use devm_platform_ioremap_resource drivers/block/Kconfig | 6 ++ drivers/block/Makefile | 1 + drivers/block/n64cart.c | 217 ++++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 224 insertions(+) create mode 100644 drivers/block/n64cart.c -- 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..a0c1f1e --- /dev/null +++ b/drivers/block/n64cart.c @@ -0,0 +1,217 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Support for the N64 cart. + * + * Copyright (c) 2021 Lauri Kasanen + */ + +#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 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) + +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 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 = 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 -= 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 = 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; + } + + major = register_blkdev(0, "n64cart"); + if (major <= 0) { + pr_err("n64cart: unable to get major number\n"); + return -EBUSY; + } + + 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)) { + err = PTR_ERR(queue); + goto fail_reg; + } + + buf = kmalloc(BUFSIZE, GFP_DMA | GFP_KERNEL); + if (!buf) { + err = -ENOMEM; + goto fail_queue; + } + dma_addr = virt_to_phys(buf); + + reg_base = devm_platform_ioremap_resource(pdev, 0); + if (!reg_base) { + err = -EINVAL; + goto fail_dma; + } + + disk = alloc_disk(1); + if (!disk) { + err = -ENOMEM; + goto fail_dma; + } + + disk->major = major; + disk->first_minor = 0; + disk->queue = queue; + disk->flags = GENHD_FL_NO_PART_SCAN; + 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: + kfree(buf); +fail_queue: + blk_cleanup_queue(queue); +fail_reg: + unregister_blkdev(major, "n64cart"); + 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);