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-rw-r--r--drivers/dio/dio.c286
1 files changed, 286 insertions, 0 deletions
diff --git a/drivers/dio/dio.c b/drivers/dio/dio.c
new file mode 100644
index 000000000..1414a1c81
--- /dev/null
+++ b/drivers/dio/dio.c
@@ -0,0 +1,286 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Code to support devices on the DIO and DIO-II bus
+ * Copyright (C) 05/1998 Peter Maydell <pmaydell@chiark.greenend.org.uk>
+ * Copyright (C) 2004 Jochen Friedrich <jochen@scram.de>
+ *
+ * This code has basically these routines at the moment:
+ * int dio_find(u_int deviceid)
+ * Search the list of DIO devices and return the select code
+ * of the next unconfigured device found that matches the given device ID.
+ * Note that the deviceid parameter should be the encoded ID.
+ * This means that framebuffers should pass it as
+ * DIO_ENCODE_ID(DIO_ID_FBUFFER,DIO_ID2_TOPCAT)
+ * (or whatever); everybody else just uses DIO_ID_FOOBAR.
+ * unsigned long dio_scodetophysaddr(int scode)
+ * Return the physical address corresponding to the given select code.
+ * int dio_scodetoipl(int scode)
+ * Every DIO card has a fixed interrupt priority level. This function
+ * returns it, whatever it is.
+ * const char *dio_scodetoname(int scode)
+ * Return a character string describing this board [might be "" if
+ * not CONFIG_DIO_CONSTANTS]
+ * void dio_config_board(int scode) mark board as configured in the list
+ * void dio_unconfig_board(int scode) mark board as no longer configured
+ *
+ * This file is based on the way the Amiga port handles Zorro II cards,
+ * although we aren't so complicated...
+ */
+#include <linux/module.h>
+#include <linux/string.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/dio.h>
+#include <linux/slab.h> /* kmalloc() */
+#include <linux/uaccess.h>
+#include <asm/io.h> /* readb() */
+
+struct dio_bus dio_bus = {
+ .resources = {
+ /* DIO range */
+ { .name = "DIO mem", .start = 0x00600000, .end = 0x007fffff },
+ /* DIO-II range */
+ { .name = "DIO-II mem", .start = 0x01000000, .end = 0x1fffffff }
+ },
+ .name = "DIO bus"
+};
+
+/* not a real config option yet! */
+#define CONFIG_DIO_CONSTANTS
+
+#ifdef CONFIG_DIO_CONSTANTS
+/* We associate each numeric ID with an appropriate descriptive string
+ * using a constant array of these structs.
+ * FIXME: we should be able to arrange to throw away most of the strings
+ * using the initdata stuff. Then we wouldn't need to worry about
+ * carrying them around...
+ * I think we do this by copying them into newly kmalloc()ed memory and
+ * marking the names[] array as .initdata ?
+ */
+struct dioname
+{
+ int id;
+ const char *name;
+};
+
+/* useful macro */
+#define DIONAME(x) { DIO_ID_##x, DIO_DESC_##x }
+#define DIOFBNAME(x) { DIO_ENCODE_ID( DIO_ID_FBUFFER, DIO_ID2_##x), DIO_DESC2_##x }
+
+static struct dioname names[] =
+{
+ DIONAME(DCA0), DIONAME(DCA0REM), DIONAME(DCA1), DIONAME(DCA1REM),
+ DIONAME(DCM), DIONAME(DCMREM),
+ DIONAME(LAN),
+ DIONAME(FHPIB), DIONAME(NHPIB),
+ DIONAME(SCSI0), DIONAME(SCSI1), DIONAME(SCSI2), DIONAME(SCSI3),
+ DIONAME(FBUFFER),
+ DIONAME(PARALLEL), DIONAME(VME), DIONAME(DCL), DIONAME(DCLREM),
+ DIONAME(MISC0), DIONAME(MISC1), DIONAME(MISC2), DIONAME(MISC3),
+ DIONAME(MISC4), DIONAME(MISC5), DIONAME(MISC6), DIONAME(MISC7),
+ DIONAME(MISC8), DIONAME(MISC9), DIONAME(MISC10), DIONAME(MISC11),
+ DIONAME(MISC12), DIONAME(MISC13),
+ DIOFBNAME(GATORBOX), DIOFBNAME(TOPCAT), DIOFBNAME(RENAISSANCE),
+ DIOFBNAME(LRCATSEYE), DIOFBNAME(HRCCATSEYE), DIOFBNAME(HRMCATSEYE),
+ DIOFBNAME(DAVINCI), DIOFBNAME(XXXCATSEYE), DIOFBNAME(HYPERION),
+ DIOFBNAME(XGENESIS), DIOFBNAME(TIGER), DIOFBNAME(YGENESIS)
+};
+
+#undef DIONAME
+#undef DIOFBNAME
+
+static const char unknowndioname[]
+ = "unknown DIO board, please email linux-m68k@lists.linux-m68k.org";
+
+static const char *dio_getname(int id)
+{
+ /* return pointer to a constant string describing the board with given ID */
+ unsigned int i;
+ for (i = 0; i < ARRAY_SIZE(names); i++)
+ if (names[i].id == id)
+ return names[i].name;
+
+ return unknowndioname;
+}
+
+#else
+
+static char dio_no_name[] = { 0 };
+#define dio_getname(_id) (dio_no_name)
+
+#endif /* CONFIG_DIO_CONSTANTS */
+
+static void dio_dev_release(struct device *dev)
+{
+ struct dio_dev *ddev = container_of(dev, typeof(struct dio_dev), dev);
+ kfree(ddev);
+}
+
+int __init dio_find(int deviceid)
+{
+ /* Called to find a DIO device before the full bus scan has run.
+ * Only used by the console driver.
+ */
+ int scode, id;
+ u_char prid, secid, i;
+
+ for (scode = 0; scode < DIO_SCMAX; scode++) {
+ void *va;
+ unsigned long pa;
+
+ if (DIO_SCINHOLE(scode))
+ continue;
+
+ pa = dio_scodetophysaddr(scode);
+
+ if (!pa)
+ continue;
+
+ if (scode < DIOII_SCBASE)
+ va = (void *)(pa + DIO_VIRADDRBASE);
+ else
+ va = ioremap(pa, PAGE_SIZE);
+
+ if (copy_from_kernel_nofault(&i,
+ (unsigned char *)va + DIO_IDOFF, 1)) {
+ if (scode >= DIOII_SCBASE)
+ iounmap(va);
+ continue; /* no board present at that select code */
+ }
+
+ prid = DIO_ID(va);
+
+ if (DIO_NEEDSSECID(prid)) {
+ secid = DIO_SECID(va);
+ id = DIO_ENCODE_ID(prid, secid);
+ } else
+ id = prid;
+
+ if (id == deviceid) {
+ if (scode >= DIOII_SCBASE)
+ iounmap(va);
+ return scode;
+ }
+ }
+
+ return -1;
+}
+
+/* This is the function that scans the DIO space and works out what
+ * hardware is actually present.
+ */
+static int __init dio_init(void)
+{
+ int scode;
+ int i;
+ struct dio_dev *dev;
+ int error;
+
+ if (!MACH_IS_HP300)
+ return 0;
+
+ printk(KERN_INFO "Scanning for DIO devices...\n");
+
+ /* Initialize the DIO bus */
+ INIT_LIST_HEAD(&dio_bus.devices);
+ dev_set_name(&dio_bus.dev, "dio");
+ error = device_register(&dio_bus.dev);
+ if (error) {
+ pr_err("DIO: Error registering dio_bus\n");
+ return error;
+ }
+
+ /* Request all resources */
+ dio_bus.num_resources = (hp300_model == HP_320 ? 1 : 2);
+ for (i = 0; i < dio_bus.num_resources; i++)
+ request_resource(&iomem_resource, &dio_bus.resources[i]);
+
+ /* Register all devices */
+ for (scode = 0; scode < DIO_SCMAX; ++scode)
+ {
+ u_char prid, secid = 0; /* primary, secondary ID bytes */
+ u_char *va;
+ unsigned long pa;
+
+ if (DIO_SCINHOLE(scode))
+ continue;
+
+ pa = dio_scodetophysaddr(scode);
+
+ if (!pa)
+ continue;
+
+ if (scode < DIOII_SCBASE)
+ va = (void *)(pa + DIO_VIRADDRBASE);
+ else
+ va = ioremap(pa, PAGE_SIZE);
+
+ if (copy_from_kernel_nofault(&i,
+ (unsigned char *)va + DIO_IDOFF, 1)) {
+ if (scode >= DIOII_SCBASE)
+ iounmap(va);
+ continue; /* no board present at that select code */
+ }
+
+ /* Found a board, allocate it an entry in the list */
+ dev = kzalloc(sizeof(struct dio_dev), GFP_KERNEL);
+ if (!dev)
+ return 0;
+
+ dev->bus = &dio_bus;
+ dev->dev.parent = &dio_bus.dev;
+ dev->dev.bus = &dio_bus_type;
+ dev->dev.release = dio_dev_release;
+ dev->scode = scode;
+ dev->resource.start = pa;
+ dev->resource.end = pa + DIO_SIZE(scode, va);
+ dev_set_name(&dev->dev, "%02x", scode);
+
+ /* read the ID byte(s) and encode if necessary. */
+ prid = DIO_ID(va);
+
+ if (DIO_NEEDSSECID(prid)) {
+ secid = DIO_SECID(va);
+ dev->id = DIO_ENCODE_ID(prid, secid);
+ } else
+ dev->id = prid;
+
+ dev->ipl = DIO_IPL(va);
+ strcpy(dev->name,dio_getname(dev->id));
+ printk(KERN_INFO "select code %3d: ipl %d: ID %02X", dev->scode, dev->ipl, prid);
+ if (DIO_NEEDSSECID(prid))
+ printk(":%02X", secid);
+ printk(": %s\n", dev->name);
+
+ if (scode >= DIOII_SCBASE)
+ iounmap(va);
+ error = device_register(&dev->dev);
+ if (error) {
+ pr_err("DIO: Error registering device %s\n",
+ dev->name);
+ put_device(&dev->dev);
+ continue;
+ }
+ error = dio_create_sysfs_dev_files(dev);
+ if (error)
+ dev_err(&dev->dev, "Error creating sysfs files\n");
+ }
+ return 0;
+}
+
+subsys_initcall(dio_init);
+
+/* Bear in mind that this is called in the very early stages of initialisation
+ * in order to get the address of the serial port for the console...
+ */
+unsigned long dio_scodetophysaddr(int scode)
+{
+ if (scode >= DIOII_SCBASE) {
+ return (DIOII_BASE + (scode - 132) * DIOII_DEVSIZE);
+ } else if (scode > DIO_SCMAX || scode < 0)
+ return 0;
+ else if (DIO_SCINHOLE(scode))
+ return 0;
+
+ return (DIO_BASE + scode * DIO_DEVSIZE);
+}
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