Adding upstream version 5.10.209.upstream/5.10.209upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 160 insertions, 0 deletions

diff --git a/drivers/mtd/maps/sun_uflash.c b/drivers/mtd/maps/sun_uflash.c
new file mode 100644
index 000000000..eb7258293
--- /dev/null
+++ b/drivers/mtd/maps/sun_uflash.c
@@ -0,0 +1,160 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/* sun_uflash.c - Driver for user-programmable flash on
+ *                Sun Microsystems SME boardsets.
+ *
+ * This driver does NOT provide access to the OBP-flash for
+ * safety reasons-- use <linux>/drivers/sbus/char/flash.c instead.
+ *
+ * Copyright (c) 2001 Eric Brower (ebrower@usa.net)
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/errno.h>
+#include <linux/ioport.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/slab.h>
+#include <asm/prom.h>
+#include <linux/uaccess.h>
+#include <asm/io.h>
+
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/map.h>
+
+#define UFLASH_OBPNAME	"flashprom"
+#define DRIVER_NAME	"sun_uflash"
+#define PFX		DRIVER_NAME ": "
+
+#define UFLASH_WINDOW_SIZE	0x200000
+#define UFLASH_BUSWIDTH		1			/* EBus is 8-bit */
+
+MODULE_AUTHOR("Eric Brower <ebrower@usa.net>");
+MODULE_DESCRIPTION("User-programmable flash device on Sun Microsystems boardsets");
+MODULE_SUPPORTED_DEVICE(DRIVER_NAME);
+MODULE_LICENSE("GPL");
+MODULE_VERSION("2.1");
+
+struct uflash_dev {
+	const char		*name;	/* device name */
+	struct map_info 	map;	/* mtd map info */
+	struct mtd_info		*mtd;	/* mtd info */
+};
+
+struct map_info uflash_map_templ = {
+	.name =		"SUNW,???-????",
+	.size =		UFLASH_WINDOW_SIZE,
+	.bankwidth =	UFLASH_BUSWIDTH,
+};
+
+int uflash_devinit(struct platform_device *op, struct device_node *dp)
+{
+	struct uflash_dev *up;
+
+	if (op->resource[1].flags) {
+		/* Non-CFI userflash device-- once I find one we
+		 * can work on supporting it.
+		 */
+		printk(KERN_ERR PFX "Unsupported device at %pOF, 0x%llx\n",
+		       dp, (unsigned long long)op->resource[0].start);
+
+		return -ENODEV;
+	}
+
+	up = kzalloc(sizeof(struct uflash_dev), GFP_KERNEL);
+	if (!up) {
+		printk(KERN_ERR PFX "Cannot allocate struct uflash_dev\n");
+		return -ENOMEM;
+	}
+
+	/* copy defaults and tweak parameters */
+	memcpy(&up->map, &uflash_map_templ, sizeof(uflash_map_templ));
+
+	up->map.size = resource_size(&op->resource[0]);
+
+	up->name = of_get_property(dp, "model", NULL);
+	if (up->name && 0 < strlen(up->name))
+		up->map.name = up->name;
+
+	up->map.phys = op->resource[0].start;
+
+	up->map.virt = of_ioremap(&op->resource[0], 0, up->map.size,
+				  DRIVER_NAME);
+	if (!up->map.virt) {
+		printk(KERN_ERR PFX "Failed to map device.\n");
+		kfree(up);
+
+		return -EINVAL;
+	}
+
+	simple_map_init(&up->map);
+
+	/* MTD registration */
+	up->mtd = do_map_probe("cfi_probe", &up->map);
+	if (!up->mtd) {
+		of_iounmap(&op->resource[0], up->map.virt, up->map.size);
+		kfree(up);
+
+		return -ENXIO;
+	}
+
+	up->mtd->owner = THIS_MODULE;
+
+	mtd_device_register(up->mtd, NULL, 0);
+
+	dev_set_drvdata(&op->dev, up);
+
+	return 0;
+}
+
+static int uflash_probe(struct platform_device *op)
+{
+	struct device_node *dp = op->dev.of_node;
+
+	/* Flashprom must have the "user" property in order to
+	 * be used by this driver.
+	 */
+	if (!of_find_property(dp, "user", NULL))
+		return -ENODEV;
+
+	return uflash_devinit(op, dp);
+}
+
+static int uflash_remove(struct platform_device *op)
+{
+	struct uflash_dev *up = dev_get_drvdata(&op->dev);
+
+	if (up->mtd) {
+		mtd_device_unregister(up->mtd);
+		map_destroy(up->mtd);
+	}
+	if (up->map.virt) {
+		of_iounmap(&op->resource[0], up->map.virt, up->map.size);
+		up->map.virt = NULL;
+	}
+
+	kfree(up);
+
+	return 0;
+}
+
+static const struct of_device_id uflash_match[] = {
+	{
+		.name = UFLASH_OBPNAME,
+	},
+	{},
+};
+
+MODULE_DEVICE_TABLE(of, uflash_match);
+
+static struct platform_driver uflash_driver = {
+	.driver = {
+		.name = DRIVER_NAME,
+		.of_match_table = uflash_match,
+	},
+	.probe		= uflash_probe,
+	.remove		= uflash_remove,
+};
+
+module_platform_driver(uflash_driver);