- added n64 block driver

- fix for ubsan warnings
 - fix for bcm63xx platform
 - update of linux-mips mailinglist
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Merge tag 'mips_5.12_1' of git://git.kernel.org/pub/scm/linux/kernel/git/mips/linux

Pull more MIPS updates from Thomas Bogendoerfer:

 - added n64 block driver

 - fix for ubsan warnings

 - fix for bcm63xx platform

 - update of linux-mips mailinglist

* tag 'mips_5.12_1' of git://git.kernel.org/pub/scm/linux/kernel/git/mips/linux:
  arch: mips: update references to current linux-mips list
  mips: bmips: init clocks earlier
  vmlinux.lds.h: catch even more instrumentation symbols into .data
  n64: store dev instance into disk private data
  n64: cleanup n64cart_probe()
  n64: cosmetics changes
  n64: remove curly brackets
  n64: use sector SECTOR_SHIFT instead 512
  n64: use enums for reg
  n64: move module param at the top
  n64: move module info at the end
  n64: use pr_fmt to avoid duplicate string
  block: Add n64 cart driver

arch/mips/bmips/setup.c

@@ -196,4 +196,4 @@ static int __init plat_dev_init(void)
 	return 0;
 }
 
-device_initcall(plat_dev_init);
+arch_initcall(plat_dev_init);

arch/mips/kernel/r4k-bugs64.c

@@ -18,7 +18,7 @@
 static char bug64hit[] __initdata =
 	"reliable operation impossible!\n%s";
 static char nowar[] __initdata =
-	"Please report to <linux-mips@linux-mips.org>.";
+	"Please report to <linux-mips@vger.kernel.org>.";
 static char r4kwar[] __initdata =
 	"Enable CPU_R4000_WORKAROUNDS to rectify.";
 static char daddiwar[] __initdata =

arch/mips/lib/iomap-pci.c

@@ -32,7 +32,7 @@ void __iomem *__pci_ioport_map(struct pci_dev *dev,
 		sprintf(name, "%04x:%02x", pci_domain_nr(bus), bus->number);
 		printk(KERN_WARNING "io_map_base of root PCI bus %s unset.  "
 		       "Trying to continue but you better\nfix this issue or "
-		       "report it to linux-mips@linux-mips.org or your "
+		       "report it to linux-mips@vger.kernel.org or your "
 		       "vendor.\n", name);
 #ifdef CONFIG_PCI_DOMAINS
 		panic("To avoid data corruption io_map_base MUST be set with "

arch/mips/sgi-ip32/ip32-irq.c

@@ -343,7 +343,7 @@ static void ip32_unknown_interrupt(void)
 	printk("Register dump:\n");
 	show_regs(get_irq_regs());
 
-	printk("Please mail this report to linux-mips@linux-mips.org\n");
+	printk("Please mail this report to linux-mips@vger.kernel.org\n");
 	printk("Spinning...");
 	while(1) ;
 }

drivers/block/Kconfig

@@ -66,6 +66,12 @@ 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

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

drivers/block/n64cart.c

@@ -0,0 +1,178 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Support for the N64 cart.
+ *
+ * Copyright (c) 2021 Lauri Kasanen
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+#include <linux/bitops.h>
+#include <linux/blkdev.h>
+#include <linux/dma-mapping.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+
+enum {
+	PI_DRAM_REG = 0,
+	PI_CART_REG,
+	PI_READ_REG,
+	PI_WRITE_REG,
+	PI_STATUS_REG,
+};
+
+#define PI_STATUS_DMA_BUSY	(1 << 0)
+#define PI_STATUS_IO_BUSY	(1 << 1)
+
+#define CART_DOMAIN		0x10000000
+#define CART_MAX		0x1FFFFFFF
+
+#define MIN_ALIGNMENT		8
+
+static u32 __iomem *reg_base;
+
+static unsigned int start;
+module_param(start, uint, 0);
+MODULE_PARM_DESC(start, "Start address of the cart block data");
+
+static unsigned int size;
+module_param(size, uint, 0);
+MODULE_PARM_DESC(size, "Size of the cart block data, in bytes");
+
+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();
+}
+
+/*
+ * Process a single bvec of a bio.
+ */
+static bool n64cart_do_bvec(struct device *dev, struct bio_vec *bv, u32 pos)
+{
+	dma_addr_t dma_addr;
+	const u32 bstart = pos + start;
+
+	/* Alignment check */
+	WARN_ON_ONCE((bv->bv_offset & (MIN_ALIGNMENT - 1)) ||
+		     (bv->bv_len & (MIN_ALIGNMENT - 1)));
+
+	dma_addr = dma_map_bvec(dev, bv, DMA_FROM_DEVICE, 0);
+	if (dma_mapping_error(dev, dma_addr))
+		return false;
+
+	n64cart_wait_dma();
+
+	n64cart_write_reg(PI_DRAM_REG, dma_addr + bv->bv_offset);
+	n64cart_write_reg(PI_CART_REG, (bstart | CART_DOMAIN) & CART_MAX);
+	n64cart_write_reg(PI_WRITE_REG, bv->bv_len - 1);
+
+	n64cart_wait_dma();
+
+	dma_unmap_page(dev, dma_addr, bv->bv_len, DMA_FROM_DEVICE);
+	return true;
+}
+
+static blk_qc_t n64cart_submit_bio(struct bio *bio)
+{
+	struct bio_vec bvec;
+	struct bvec_iter iter;
+	struct device *dev = bio->bi_disk->private_data;
+	u32 pos = bio->bi_iter.bi_sector << SECTOR_SHIFT;
+
+	bio_for_each_segment(bvec, bio, iter) {
+		if (!n64cart_do_bvec(dev, &bvec, pos))
+			goto io_error;
+		pos += bvec.bv_len;
+	}
+
+	bio_endio(bio);
+	return BLK_QC_T_NONE;
+io_error:
+	bio_io_error(bio);
+	return BLK_QC_T_NONE;
+}
+
+static const struct block_device_operations n64cart_fops = {
+	.owner		= THIS_MODULE,
+	.submit_bio	= n64cart_submit_bio,
+};
+
+/*
+ * 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)
+{
+	struct gendisk *disk;
+
+	if (!start || !size) {
+		pr_err("start or size not specified\n");
+		return -ENODEV;
+	}
+
+	if (size & 4095) {
+		pr_err("size must be a multiple of 4K\n");
+		return -ENODEV;
+	}
+
+	reg_base = devm_platform_ioremap_resource(pdev, 0);
+	if (!reg_base)
+		return -EINVAL;
+
+	disk = alloc_disk(0);
+	if (!disk)
+		return -ENOMEM;
+
+	disk->queue = blk_alloc_queue(NUMA_NO_NODE);
+	if (!disk->queue)
+		return -ENOMEM;
+
+	disk->first_minor = 0;
+	disk->flags = GENHD_FL_NO_PART_SCAN | GENHD_FL_EXT_DEVT;
+	disk->fops = &n64cart_fops;
+	disk->private_data = &pdev->dev;
+	strcpy(disk->disk_name, "n64cart");
+
+	set_capacity(disk, size >> SECTOR_SHIFT);
+	set_disk_ro(disk, 1);
+
+	blk_queue_flag_set(QUEUE_FLAG_NONROT, disk->queue);
+	blk_queue_physical_block_size(disk->queue, 4096);
+	blk_queue_logical_block_size(disk->queue, 4096);
+
+	add_disk(disk);
+
+	pr_info("n64cart: %u kb disk\n", size / 1024);
+
+	return 0;
+}
+
+static struct platform_driver n64cart_driver = {
+	.driver = {
+		.name = "n64cart",
+	},
+};
+
+static int __init n64cart_init(void)
+{
+	return platform_driver_probe(&n64cart_driver, n64cart_probe);
+}
+
+module_init(n64cart_init);
+
+MODULE_AUTHOR("Lauri Kasanen <cand@gmx.com>");
+MODULE_DESCRIPTION("Driver for the N64 cart");
+MODULE_LICENSE("GPL");

include/asm-generic/vmlinux.lds.h

@@ -98,7 +98,7 @@
  */
 #if defined(CONFIG_LD_DEAD_CODE_DATA_ELIMINATION) || defined(CONFIG_LTO_CLANG)
 #define TEXT_MAIN .text .text.[0-9a-zA-Z_]*
-#define DATA_MAIN .data .data.[0-9a-zA-Z_]* .data..L* .data..compoundliteral* .data.$__unnamed_* .data.$Lubsan_*
+#define DATA_MAIN .data .data.[0-9a-zA-Z_]* .data..L* .data..compoundliteral* .data.$__unnamed_* .data.$L*
 #define SDATA_MAIN .sdata .sdata.[0-9a-zA-Z_]*
 #define RODATA_MAIN .rodata .rodata.[0-9a-zA-Z_]* .rodata..L*
 #define BSS_MAIN .bss .bss.[0-9a-zA-Z_]* .bss..compoundliteral*