[PATCH] RapidIO support: core base

Adds a RapidIO subsystem to the kernel.  RIO is a switched fabric interconnect
used in higher-end embedded applications.  The curious can look at the specs
over at http://www.rapidio.org

The core code implements enumeration/discovery, management of
devices/resources, and interfaces for RIO drivers.

There's a lot more to do to take advantages of all the hardware features.
However, this should provide a good base for folks with RIO hardware to start
contributing.

Signed-off-by: Matt Porter <mporter@kernel.crashing.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 230 insertions, 0 deletions

diff --git a/drivers/rapidio/rio-sysfs.c b/drivers/rapidio/rio-sysfs.c
new file mode 100644
index 000000000000..73218a37506d
--- /dev/null
+++ b/drivers/rapidio/rio-sysfs.c
@@ -0,0 +1,230 @@
+/*
+ * RapidIO sysfs attributes and support
+ *
+ * Copyright 2005 MontaVista Software, Inc.
+ * Matt Porter <mporter@kernel.crashing.org>
+ *
+ * This program is free software; you can redistribute  it and/or modify it
+ * under  the terms of  the GNU General  Public License as published by the
+ * Free Software Foundation;  either version 2 of the  License, or (at your
+ * option) any later version.
+ */
+
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/rio.h>
+#include <linux/rio_drv.h>
+#include <linux/stat.h>
+
+#include "rio.h"
+
+/* Sysfs support */
+#define rio_config_attr(field, format_string)                                   \
+static ssize_t                                                          \
+        field##_show(struct device *dev, char *buf)                     \
+{                                                                       \
+        struct rio_dev *rdev = to_rio_dev(dev);                         \
+                                                                        \
+        return sprintf(buf, format_string, rdev->field);                \
+}                                                                       \
+
+rio_config_attr(did, "0x%04x\n");
+rio_config_attr(vid, "0x%04x\n");
+rio_config_attr(device_rev, "0x%08x\n");
+rio_config_attr(asm_did, "0x%04x\n");
+rio_config_attr(asm_vid, "0x%04x\n");
+rio_config_attr(asm_rev, "0x%04x\n");
+
+static ssize_t routes_show(struct device *dev, char *buf)
+{
+        struct rio_dev *rdev = to_rio_dev(dev);
+        char *str = buf;
+        int i;
+
+        if (!rdev->rswitch)
+                goto out;
+
+        for (i = 0; i < RIO_MAX_ROUTE_ENTRIES; i++) {
+                if (rdev->rswitch->route_table[i] == RIO_INVALID_ROUTE)
+                        continue;
+                str +=
+                    sprintf(str, "%04x %02x\n", i,
+                            rdev->rswitch->route_table[i]);
+        }
+
+      out:
+        return (str - buf);
+}
+
+struct device_attribute rio_dev_attrs[] = {
+        __ATTR_RO(did),
+        __ATTR_RO(vid),
+        __ATTR_RO(device_rev),
+        __ATTR_RO(asm_did),
+        __ATTR_RO(asm_vid),
+        __ATTR_RO(asm_rev),
+        __ATTR_RO(routes),
+        __ATTR_NULL,
+};
+
+static ssize_t
+rio_read_config(struct kobject *kobj, char *buf, loff_t off, size_t count)
+{
+        struct rio_dev *dev =
+            to_rio_dev(container_of(kobj, struct device, kobj));
+        unsigned int size = 0x100;
+        loff_t init_off = off;
+        u8 *data = (u8 *) buf;
+
+        /* Several chips lock up trying to read undefined config space */
+        if (capable(CAP_SYS_ADMIN))
+                size = 0x200000;
+
+        if (off > size)
+                return 0;
+        if (off + count > size) {
+                size -= off;
+                count = size;
+        } else {
+                size = count;
+        }
+
+        if ((off & 1) && size) {
+                u8 val;
+                rio_read_config_8(dev, off, &val);
+                data[off - init_off] = val;
+                off++;
+                size--;
+        }
+
+        if ((off & 3) && size > 2) {
+                u16 val;
+                rio_read_config_16(dev, off, &val);
+                data[off - init_off] = (val >> 8) & 0xff;
+                data[off - init_off + 1] = val & 0xff;
+                off += 2;
+                size -= 2;
+        }
+
+        while (size > 3) {
+                u32 val;
+                rio_read_config_32(dev, off, &val);
+                data[off - init_off] = (val >> 24) & 0xff;
+                data[off - init_off + 1] = (val >> 16) & 0xff;
+                data[off - init_off + 2] = (val >> 8) & 0xff;
+                data[off - init_off + 3] = val & 0xff;
+                off += 4;
+                size -= 4;
+        }
+
+        if (size >= 2) {
+                u16 val;
+                rio_read_config_16(dev, off, &val);
+                data[off - init_off] = (val >> 8) & 0xff;
+                data[off - init_off + 1] = val & 0xff;
+                off += 2;
+                size -= 2;
+        }
+
+        if (size > 0) {
+                u8 val;
+                rio_read_config_8(dev, off, &val);
+                data[off - init_off] = val;
+                off++;
+                --size;
+        }
+
+        return count;
+}
+
+static ssize_t
+rio_write_config(struct kobject *kobj, char *buf, loff_t off, size_t count)
+{
+        struct rio_dev *dev =
+            to_rio_dev(container_of(kobj, struct device, kobj));
+        unsigned int size = count;
+        loff_t init_off = off;
+        u8 *data = (u8 *) buf;
+
+        if (off > 0x200000)
+                return 0;
+        if (off + count > 0x200000) {
+                size = 0x200000 - off;
+                count = size;
+        }
+
+        if ((off & 1) && size) {
+                rio_write_config_8(dev, off, data[off - init_off]);
+                off++;
+                size--;
+        }
+
+        if ((off & 3) && (size > 2)) {
+                u16 val = data[off - init_off + 1];
+                val |= (u16) data[off - init_off] << 8;
+                rio_write_config_16(dev, off, val);
+                off += 2;
+                size -= 2;
+        }
+
+        while (size > 3) {
+                u32 val = data[off - init_off + 3];
+                val |= (u32) data[off - init_off + 2] << 8;
+                val |= (u32) data[off - init_off + 1] << 16;
+                val |= (u32) data[off - init_off] << 24;
+                rio_write_config_32(dev, off, val);
+                off += 4;
+                size -= 4;
+        }
+
+        if (size >= 2) {
+                u16 val = data[off - init_off + 1];
+                val |= (u16) data[off - init_off] << 8;
+                rio_write_config_16(dev, off, val);
+                off += 2;
+                size -= 2;
+        }
+
+        if (size) {
+                rio_write_config_8(dev, off, data[off - init_off]);
+                off++;
+                --size;
+        }
+
+        return count;
+}
+
+static struct bin_attribute rio_config_attr = {
+        .attr = {
+                 .name = "config",
+                 .mode = S_IRUGO | S_IWUSR,
+                 .owner = THIS_MODULE,
+                 },
+        .size = 0x200000,
+        .read = rio_read_config,
+        .write = rio_write_config,
+};
+
+/**
+ * rio_create_sysfs_dev_files - create RIO specific sysfs files
+ * @rdev: device whose entries should be created
+ *
+ * Create files when @rdev is added to sysfs.
+ */
+int rio_create_sysfs_dev_files(struct rio_dev *rdev)
+{
+        sysfs_create_bin_file(&rdev->dev.kobj, &rio_config_attr);
+
+        return 0;
+}
+
+/**
+ * rio_remove_sysfs_dev_files - cleanup RIO specific sysfs files
+ * @rdev: device whose entries we should free
+ *
+ * Cleanup when @rdev is removed from sysfs.
+ */
+void rio_remove_sysfs_dev_files(struct rio_dev *rdev)
+{
+        sysfs_remove_bin_file(&rdev->dev.kobj, &rio_config_attr);
+}