From patchwork Fri Jan 8 08:31:33 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lauri Kasanen X-Patchwork-Id: 12006051 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=-10.8 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 1E1F8C433DB for ; Fri, 8 Jan 2021 08:31:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E4B4923435 for ; Fri, 8 Jan 2021 08:31:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725816AbhAHIb3 (ORCPT ); Fri, 8 Jan 2021 03:31:29 -0500 Received: from mout.gmx.net ([212.227.15.18]:38153 "EHLO mout.gmx.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727146AbhAHIb3 (ORCPT ); Fri, 8 Jan 2021 03:31:29 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=gmx.net; s=badeba3b8450; t=1610094595; bh=m9byucVO091/LdU9ukZICn2KjnI3jZ5sfSXN6yCzgyc=; h=X-UI-Sender-Class:Date:From:To:Cc:Subject; b=W1Ci09gXXNFuI9kgupgCsa256Xi+0gLyanL0L0KSOkICSWWzHnrxm7KCpenyM0N16 tnP4uPE+rS1LS4OMmEXEoGvx8YsX0zfOHGGUhHAh3OnwZ06pxiF5H6dW/PfKvLy1TP BEqJB5qBB6BX0pSbQoeBrJj9ecu33RKqheqliL+0= 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 1McH5a-1kNcze3I5c-00cdm4; Fri, 08 Jan 2021 09:29:54 +0100 Date: Fri, 8 Jan 2021 10:31:33 +0200 From: Lauri Kasanen To: linux-mips@vger.kernel.org Cc: tsbogend@alpha.franken.de Subject: [PATCH 2/6 v2] mips: Add N64 machine type Message-Id: <20210108103133.fcb577c891c56d009d5737a6@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:KdBDsdgXJUJkwfhXDoWyOoqO+4Mck9toWLVGHhz0iW26KFhuR3g 1gyKAlpNEll/IjLKYZURwssBPmBpCN5I2MGbyTjk0ckC6VRw/0oZQstyloQX7WoEL4XVq9l 21w9zgAYI3rr55skXEt7Gbk/YDxD4mqcY4zItqRTLshF0B8iOZpkWQPIt/zLVYWCYqyBinx iopHTCgO3Doptih70YhAQ== X-UI-Out-Filterresults: notjunk:1;V03:K0:L5bT5vXcSxs=:+sJVoNYCTCf0jySDtIAwR4 8rBqlL1cZxvxYX0NVM3rkEm8dJ0zzpVm60A5J8yCMjLTQeQnKDF9mQFBBMikxuQsDk9tm+3dk O8m9Tm47i85fzVTPSKZo/K/CQbQ8vbEbHUH9noWo6NeQHJzudwpzYMjNxcceC9RZ9/bFGaOmv rSenBCvbj7Yeu4cLKavSS1FgjR6WYE7AkYCkxuw6P89gvl0+9+ZvGSJ8jX9ZcK7EcWYFVP6CB svBb/aUMXviXwWN9N+mDXp1jO++RVXd93NzWx2s7L+8YmZIP9w0pWdk03zixi10Fb56Di+jS0 igcHynA66/5vM5GGVCzVq1On7m7A7ctYl29lwDo/Ts6yUrkxTIDkxvEGNUPagT3CGp0g5gM/u X81MlNlLtzJiUagAzdNtJfJcGzdnnQFBjJzrLrk9WjaulCjzklgDnED0Woq42ZK52yosYo6H8 StSIwz51wCUPeKHpodcTOd2b+jTNwG+5pFanK1+Uf8QrcH+EjFDKRd8Ugw5azi6a6pNqWA7LN f4QY/e0nnTzAg+00NEeTIsAH/0SEX7gJnYdxoFl2r0AGPs5S+93DZnz5Mb9mk9eYiDU5o2Up0 YAj+TzBZ6pugEGH3eCys5BnFgfA//x9jx6IGqNdb9vJ+WWPuTwYtnzIHRK8v7dst55jYc5NQX RhXamYJqxu2wxJm/SQLxIL4E+Y2tspHgsnxhPPEvRKHj4qfhUjDFG0MW+HglVhSW6uAPPItIw lOzO58Tch+GKhC85nxbejf84rEqrjW5ro0UpWnYTVdXMPMy4glM5B8rn3STdKqt3czVjlTgc7 Nx5V84RUS61FXgK+4rGHoCnb2KI7wZbss34HUHlhQvC+y8GK85iL77qCwvVSg5fSAxkjpn4KX N33DS9ZY10YiZIMsKFfg== Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org Signed-off-by: Lauri Kasanen --- v2: smaller kmalloc align irq header cleanup no cpp comments remove prom_free_prom_memory arch/mips/Kbuild.platforms | 1 + arch/mips/Kconfig | 12 ++++ arch/mips/include/asm/mach-n64/irq.h | 22 ++++++ arch/mips/include/asm/mach-n64/kmalloc.h | 8 +++ arch/mips/n64/Makefile | 6 ++ arch/mips/n64/Platform | 7 ++ arch/mips/n64/init.c | 115 +++++++++++++++++++++++++++++++ arch/mips/n64/irq.c | 16 +++++ 8 files changed, 187 insertions(+) create mode 100644 arch/mips/include/asm/mach-n64/irq.h create mode 100644 arch/mips/include/asm/mach-n64/kmalloc.h create mode 100644 arch/mips/n64/Makefile create mode 100644 arch/mips/n64/Platform create mode 100644 arch/mips/n64/init.c create mode 100644 arch/mips/n64/irq.c -- 2.6.2 diff --git a/arch/mips/Kbuild.platforms b/arch/mips/Kbuild.platforms index 5483e38..e4f6e49 100644 --- a/arch/mips/Kbuild.platforms +++ b/arch/mips/Kbuild.platforms @@ -18,6 +18,7 @@ platform-$(CONFIG_MACH_LOONGSON2EF) += loongson2ef/ platform-$(CONFIG_MACH_LOONGSON32) += loongson32/ platform-$(CONFIG_MACH_LOONGSON64) += loongson64/ platform-$(CONFIG_MIPS_MALTA) += mti-malta/ +platform-$(CONFIG_MACH_NINTENDO64) += n64/ platform-$(CONFIG_NLM_COMMON) += netlogic/ platform-$(CONFIG_PIC32MZDA) += pic32/ platform-$(CONFIG_MACH_PISTACHIO) += pistachio/ diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig index 4b52588..1b0aae0 100644 --- a/arch/mips/Kconfig +++ b/arch/mips/Kconfig @@ -605,6 +605,18 @@ config MACH_VR41XX select SYS_SUPPORTS_MIPS16 select GPIOLIB +config MACH_NINTENDO64 + bool "Nintendo 64 console" + select CEVT_R4K + select CSRC_R4K + select SYS_HAS_CPU_R4300 + select SYS_SUPPORTS_BIG_ENDIAN + select SYS_SUPPORTS_ZBOOT + select SYS_SUPPORTS_32BIT_KERNEL + select SYS_SUPPORTS_64BIT_KERNEL + select DMA_NONCOHERENT + select IRQ_MIPS_CPU + config RALINK bool "Ralink based machines" select CEVT_R4K diff --git a/arch/mips/include/asm/mach-n64/irq.h b/arch/mips/include/asm/mach-n64/irq.h new file mode 100644 index 0000000..125e301 --- /dev/null +++ b/arch/mips/include/asm/mach-n64/irq.h @@ -0,0 +1,22 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef __ASM_MACH_N64_IRQ_H +#define __ASM_MACH_N64_IRQ_H + +#define NR_IRQS 8 + +/* + * System-specifc irq names for clarity + */ +#define MIPS_CPU_IRQ(x) (MIPS_CPU_IRQ_BASE + (x)) +#define MIPS_SOFTINT0_IRQ MIPS_CPU_IRQ(0) +#define MIPS_SOFTINT1_IRQ MIPS_CPU_IRQ(1) +#define RCP_IRQ MIPS_CPU_IRQ(2) +#define CART_IRQ MIPS_CPU_IRQ(3) +#define PRENMI_IRQ MIPS_CPU_IRQ(4) +#define RDBR_IRQ MIPS_CPU_IRQ(5) +#define RDBW_IRQ MIPS_CPU_IRQ(6) +#define TIMER_IRQ MIPS_CPU_IRQ(7) + +#include + +#endif /* __ASM_MACH_N64_IRQ_H */ diff --git a/arch/mips/include/asm/mach-n64/kmalloc.h b/arch/mips/include/asm/mach-n64/kmalloc.h new file mode 100644 index 0000000..e8b8d0b --- /dev/null +++ b/arch/mips/include/asm/mach-n64/kmalloc.h @@ -0,0 +1,8 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef __ASM_MACH_N64_KMALLOC_H +#define __ASM_MACH_N64_KMALLOC_H + +/* The default of 128 bytes wastes too much, use 32 (the largest cacheline, I) */ +#define ARCH_DMA_MINALIGN L1_CACHE_BYTES + +#endif /* __ASM_MACH_N64_KMALLOC_H */ diff --git a/arch/mips/n64/Makefile b/arch/mips/n64/Makefile new file mode 100644 index 0000000..b64a05a --- /dev/null +++ b/arch/mips/n64/Makefile @@ -0,0 +1,6 @@ +# SPDX-License-Identifier: GPL-2.0 +# +# Nintendo 64 +# + +obj-y := init.o irq.o diff --git a/arch/mips/n64/Platform b/arch/mips/n64/Platform new file mode 100644 index 0000000..2464783 --- /dev/null +++ b/arch/mips/n64/Platform @@ -0,0 +1,7 @@ +# SPDX-License-Identifier: GPL-2.0 +# +# Nintendo 64 +# + +cflags-$(CONFIG_MACH_NINTENDO64) += -I$(srctree)/arch/mips/include/asm/mach-n64 +load-$(CONFIG_MACH_NINTENDO64) += 0xffffffff80101000 diff --git a/arch/mips/n64/init.c b/arch/mips/n64/init.c new file mode 100644 index 0000000..8861ac3d --- /dev/null +++ b/arch/mips/n64/init.c @@ -0,0 +1,115 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Nintendo 64 init. + * + * Copyright (C) 2020 Lauri Kasanen + */ +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include + +#define IO_MEM_RESOURCE_START 0UL +#define IO_MEM_RESOURCE_END 0x1fffffffUL + +static void __init iomem_resource_init(void) +{ + iomem_resource.start = IO_MEM_RESOURCE_START; + iomem_resource.end = IO_MEM_RESOURCE_END; +} + +const char *get_system_type(void) +{ + return "Nintendo 64"; +} + +void __init prom_init(void) +{ + fw_init_cmdline(); +} + +#define W 320 +#define H 240 +#define REG_BASE ((u32 *) CKSEG1ADDR(0x4400000)) + +static void __init n64rdp_write_reg(const u8 reg, const u32 value) +{ + __raw_writel(value, REG_BASE + reg); +} + +#undef REG_BASE + +static const u32 ntsc_320[] __initconst = { + 0x00013212, 0x00000000, 0x00000140, 0x00000200, + 0x00000000, 0x03e52239, 0x0000020d, 0x00000c15, + 0x0c150c15, 0x006c02ec, 0x002501ff, 0x000e0204, + 0x00000200, 0x00000400 +}; + +static int __init n64_platform_init(void) +{ + static const char simplefb_resname[] = "FB"; + static const struct simplefb_platform_data mode = { + .width = W, + .height = H, + .stride = W * 2, + .format = "r5g5b5a1" + }; + struct resource res; + void *orig; + unsigned long phys; + unsigned i; + + platform_device_register_simple("n64audio", -1, NULL, 0); + + /* The framebuffer needs 64-byte alignment */ + orig = kzalloc(W * H * 2 + 63, GFP_DMA | GFP_KERNEL); + if (!orig) + return -ENOMEM; + phys = virt_to_phys(orig); + phys += 63; + phys &= ~63; + + for (i = 0; i < ARRAY_SIZE(ntsc_320); i++) { + if (i == 1) + n64rdp_write_reg(i, phys); + else + n64rdp_write_reg(i, ntsc_320[i]); + } + + /* setup IORESOURCE_MEM as framebuffer memory */ + memset(&res, 0, sizeof(res)); + res.flags = IORESOURCE_MEM; + res.name = simplefb_resname; + res.start = phys; + res.end = phys + W * H * 2 - 1; + + platform_device_register_resndata(NULL, "simple-framebuffer", 0, + &res, 1, &mode, sizeof(mode)); + + return 0; +} + +#undef W +#undef H + +arch_initcall(n64_platform_init); + +void __init plat_mem_setup(void) +{ + iomem_resource_init(); + memblock_add(0x0, 8 * 1024 * 1024); /* Bootloader blocks the 4mb config */ +} + +void __init plat_time_init(void) +{ + /* 93.75 MHz cpu, count register runs at half rate */ + mips_hpt_frequency = 93750000 / 2; +} diff --git a/arch/mips/n64/irq.c b/arch/mips/n64/irq.c new file mode 100644 index 0000000..9f833cb --- /dev/null +++ b/arch/mips/n64/irq.c @@ -0,0 +1,16 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * N64 IRQ + * + * Copyright (C) 2020 Lauri Kasanen + */ +#include +#include +#include + +#include + +void __init arch_init_irq(void) +{ + mips_cpu_irq_init(); +} From patchwork Fri Jan 8 08:35:13 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lauri Kasanen X-Patchwork-Id: 12006057 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 01F10C433E0 for ; Fri, 8 Jan 2021 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[212.227.17.184]) with ESMTPSA (Nemesis) id 1MsYv3-1k5oyk43n1-00u1xZ; Fri, 08 Jan 2021 09:33:34 +0100 Date: Fri, 8 Jan 2021 10:35:13 +0200 From: Lauri Kasanen To: linux-mips@vger.kernel.org Cc: tsbogend@alpha.franken.de, perex@perex.cz, tiwai@suse.com Subject: [PATCH 5/6 v2] sound: Add n64 driver Message-Id: <20210108103513.336e6eb9ad323feff6758e20@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:ir/VQEHLQL8e4kk4zo8sIb2H2Fcr/zN8086s8cDPYhMcXT9SgcG LP/bbnlgXSaYv9y3c5VXgxgwnmY81OVQcth2fGjmdLL1DKKtUx+wrmBaGiGIsbE+2Jr26g3 Xnqwzl3+tj+kxXkimUjB/BhJycVjdkYcOyAxB5P/TP1yevVKMhnw42OTzUjvjiaM6K8Y6UI otvxtLTCed3G4CaqlpQbg== X-UI-Out-Filterresults: notjunk:1;V03:K0:pTWOIgYn3Vc=:FDuFmagHMZ5iEIxBsWVzFe 6tXxZnhO8MiQiUgsHsxUDPeRA8ziitJSoGEpRE7/zMQ6Fc2UwWH/vJXP/MfKL7KgtBy65XzD5 pdpWzIhzpFmqWpGCN64dVYlO4yclrXHSLPaZz773PSYlwTMcHbmHIeNVFrrmBhZM1SS09wZRR fQ/Q434B6YpA8uoO7i0OE0T/olygRDLXbbRUrLnYMV69beRZo0PJAxJKGYzwoHwFRp6Xzx10u N6wAp0CmtTKCTUdJOskc7yj8yVXX7PTodUyPpvvtryPjfgpXpV04LobrDlEHjzPdlDDzmp7I+ GEHY8xy0W6Tsb6EYpUZSXC3+QSFqOsOmJP27a9BJUvn6n3/3FZ5V/ivNpj5DeDXujWYWp3F/7 0KYZzrQlGCM6pvyYocLxNzmQxrnONU+sS0+PWK9YYs2cRWsRj4/Br4tCs9JA2RHQfDS+wweNb x9Vzja6w5b4haGGx7HGM3rKGbQKdBMJosMK4M9IFvJ8uMgfW2fzH87ojsSP21/hvLfJngJHgK E1Zb1vsLglZpHXbGnwrWzYlHy3EarRoe8/mq9Ued62wvElBSZxr7UN5u3W9CchdBb7iiGvngy J1+Ter6uBAUTmRLcX0OiliHcJROR3oq/+hpjRtcQpbiZSF091x6vkjMMqFAJ49LE0y+fkuJ+Z dwZYfZfKKrX34ooR5DcOd23Ta+FBdTCS//GEkYrrR3LwkoJ+U+urwmkVfnX1fJflQ7XmN5wRn /wsU5RhimP6N9XAlwH1gKmGdTQFP7GasxXDf6BA2bReDzdyjYe8lNxYfhJyXwLyUI69V7iCzc ePOFeIes85JhtCXXcOc5fdUyvNTUPbjdMrFVPS2A71iAoxvnfMNhTblJQzkAcNO03cph3ojjB 4f33IPbyP8BEbyQ6R5ow== Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org This adds support for the Nintendo 64 console's sound. The sound DMA unit has errata on certain alignments, which is why we can't use alsa's DMA buffer directly. Signed-off-by: Lauri Kasanen --- v2: s/to_uncac/ckseg1/ sound/mips/Kconfig | 7 ++ sound/mips/Makefile | 1 + sound/mips/snd-n64.c | 297 +++++++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 305 insertions(+) create mode 100644 sound/mips/snd-n64.c -- 2.6.2 diff --git a/sound/mips/Kconfig b/sound/mips/Kconfig index b497b80..c8b4db5 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 + 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..0317fe2 --- /dev/null +++ b/sound/mips/snd-n64.c @@ -0,0 +1,297 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Sound driver for Nintendo 64. + * + * Copyright 2020 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 REG_BASE ((u32 *) CKSEG1ADDR(0x4500000)) + +#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_REG_BASE ((u32 *) CKSEG1ADDR(0x4300000)) + +#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_t { + struct snd_card *card; + + void *ring_base; + dma_addr_t ring_base_dma; + + struct { + struct snd_pcm_substream *substream; + int pos, nextpos; + u32 writesize; + u32 bufsize; + spinlock_t lock; + } chan; +}; + +static void n64audio_write_reg(const u8 reg, const u32 value) +{ + __raw_writel(value, REG_BASE + reg); +} + +static void n64mi_write_reg(const u8 reg, const u32 value) +{ + __raw_writel(value, MI_REG_BASE + reg); +} + +static u32 n64mi_read_reg(const u8 reg) +{ + return __raw_readl(MI_REG_BASE + reg); +} + +static void n64audio_push(struct n64audio_t *priv, uint8_t irq) +{ + struct snd_pcm_runtime *runtime = priv->chan.substream->runtime; + unsigned long flags; + u32 count; + + count = priv->chan.writesize; + count &= ~7; + + spin_lock_irqsave(&priv->chan.lock, flags); + + memcpy(priv->ring_base, runtime->dma_area + priv->chan.nextpos, count); + + n64audio_write_reg(AI_ADDR_REG, priv->ring_base_dma); + n64audio_write_reg(AI_LEN_REG, count); + + priv->chan.nextpos += count; + priv->chan.nextpos %= priv->chan.bufsize; + if (irq) + priv->chan.pos = priv->chan.nextpos; + + spin_unlock_irqrestore(&priv->chan.lock, flags); +} + +static irqreturn_t n64audio_isr(int irq, void *dev_id) +{ + struct n64audio_t *priv = dev_id; + + // Check it's ours + const u32 intrs = n64mi_read_reg(MI_INTR_REG); + if (!(intrs & MI_INTR_AI)) + return IRQ_NONE; + + n64audio_write_reg(AI_STATUS_REG, 1); + + n64audio_push(priv, 1); + snd_pcm_period_elapsed(priv->chan.substream); + + 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 = 1, + .periods_max = 128, +}; + +static int n64audio_pcm_open(struct snd_pcm_substream *substream) +{ + struct snd_pcm_runtime *runtime = substream->runtime; + + runtime->hw = n64audio_pcm_hw; + return 0; +} + +static int n64audio_pcm_prepare(struct snd_pcm_substream *substream) +{ + struct snd_pcm_runtime *runtime = substream->runtime; + struct n64audio_t *priv = substream->pcm->private_data; + unsigned long flags; + u32 rate; + + rate = ((2 * AI_NTSC_DACRATE / runtime->rate) + 1) / 2 - 1; + + n64audio_write_reg(AI_RATE_REG, rate); + + rate /= 66; + if (rate > 16) + rate = 16; + n64audio_write_reg(AI_BITCLOCK_REG, rate - 1); + + spin_lock_irqsave(&priv->chan.lock, flags); + + /* 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_irqrestore(&priv->chan.lock, flags); + return 0; +} + +static int n64audio_pcm_trigger(struct snd_pcm_substream *substream, + int cmd) +{ + switch (cmd) { + case SNDRV_PCM_TRIGGER_START: + n64audio_push(substream->pcm->private_data, 0); + n64audio_write_reg(AI_CONTROL_REG, 1); + n64mi_write_reg(MI_MASK_REG, MI_MASK_SET_AI); + break; + case SNDRV_PCM_TRIGGER_STOP: + n64audio_write_reg(AI_CONTROL_REG, 0); + n64mi_write_reg(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_t *priv = substream->pcm->private_data; + + return bytes_to_frames(substream->runtime, + priv->chan.pos); +} + +static int n64audio_pcm_close(struct snd_pcm_substream *substream) +{ + return 0; // Nothing to do, but the kernel crashes if close() doesn't exist +} + +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, +}; + +static int __init n64audio_probe(struct platform_device *pdev) +{ + struct snd_card *card; + struct snd_pcm *pcm; + struct n64audio_t *priv; + int err; + + err = snd_card_new(&pdev->dev, SNDRV_DEFAULT_IDX1, + SNDRV_DEFAULT_STR1, + THIS_MODULE, 0, &card); + if (err < 0) + return err; + + priv = kzalloc(sizeof(*priv), GFP_KERNEL); + if (priv == NULL) { + err = -ENOMEM; + goto fail_card; + } + + 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) + goto fail_alloc; + + if (request_irq(RCP_IRQ, n64audio_isr, + IRQF_SHARED, "N64 Audio", priv)) { + err = -EBUSY; + goto fail_alloc; + } + + spin_lock_init(&priv->chan.lock); + + err = snd_pcm_new(card, "N64 Audio", 0, 1, 0, &pcm); + if (err < 0) + goto fail_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, NULL, 0, 0); + + strcpy(card->driver, "N64 Audio"); + strcpy(card->shortname, "N64 Audio"); + strcpy(card->longname, "N64 Audio"); + + err = snd_card_register(card); + if (err < 0) + goto fail_alloc; + + platform_set_drvdata(pdev, priv); + + return 0; + +fail_alloc: + kfree(priv); + +fail_card: + snd_card_free(card); + return err; +} + +static struct platform_driver n64audio_driver = { + .driver = { + .name = "n64audio", + }, +}; + +static int __init n64audio_init(void) +{ + int ret; + + ret = platform_driver_probe(&n64audio_driver, n64audio_probe); + + return ret; +} + +fs_initcall(n64audio_init);