1 files changed, 223 insertions, 0 deletions

diff --git a/drivers/pci/hotplug/cpcihp_generic.c b/drivers/pci/hotplug/cpcihp_generic.c
new file mode 100644
index 000000000000..a62a4345b466
--- /dev/null
+++ b/drivers/pci/hotplug/cpcihp_generic.c
@@ -0,0 +1,223 @@
+/*
+ * cpcihp_generic.c
+ *
+ * Generic port I/O CompactPCI driver
+ *
+ * Copyright 2002 SOMA Networks, Inc.
+ * Copyright 2001 Intel San Luis Obispo
+ * Copyright 2000,2001 MontaVista Software Inc.
+ *
+ * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
+ * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY 
+ * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL 
+ * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ * This generic CompactPCI hotplug driver should allow using the PCI hotplug
+ * mechanism on any CompactPCI board that exposes the #ENUM signal as a bit
+ * in a system register that can be read through standard port I/O.
+ *
+ * Send feedback to <scottm@somanetworks.com>
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/errno.h>
+#include <linux/pci.h>
+#include "cpci_hotplug.h"
+
+#define DRIVER_VERSION  "0.1"
+#define DRIVER_AUTHOR   "Scott Murray <scottm@somanetworks.com>"
+#define DRIVER_DESC     "Generic port I/O CompactPCI Hot Plug Driver"
+
+#if !defined(MODULE)
+#define MY_NAME "cpcihp_generic"
+#else
+#define MY_NAME THIS_MODULE->name
+#endif
+
+#define dbg(format, arg...)                                     \
+        do {                                                    \
+                if(debug)                                       \
+                        printk (KERN_DEBUG "%s: " format "\n",  \
+                                MY_NAME , ## arg);              \
+        } while(0)
+#define err(format, arg...) printk(KERN_ERR "%s: " format "\n", MY_NAME , ## arg)
+#define info(format, arg...) printk(KERN_INFO "%s: " format "\n", MY_NAME , ## arg)
+#define warn(format, arg...) printk(KERN_WARNING "%s: " format "\n", MY_NAME , ## arg)
+
+/* local variables */
+static int debug;
+static char *bridge;
+static u8 bridge_busnr;
+static u8 bridge_slot;
+static struct pci_bus *bus;
+static u8 first_slot;
+static u8 last_slot;
+static u16 port;
+static unsigned int enum_bit;
+static u8 enum_mask;
+
+static struct cpci_hp_controller_ops generic_hpc_ops;
+static struct cpci_hp_controller generic_hpc;
+
+static int __init validate_parameters(void)
+{
+        char* str;
+        char* p;
+        unsigned long tmp;
+
+        if(!bridge) {
+                info("not configured, disabling.");
+                return 1;
+        }
+        str = bridge;
+        if(!*str)
+                return -EINVAL;
+
+        tmp = simple_strtoul(str, &p, 16);
+        if(p == str || tmp > 0xff) {
+                err("Invalid hotplug bus bridge device bus number");
+                return -EINVAL;
+        }
+        bridge_busnr = (u8) tmp;
+        dbg("bridge_busnr = 0x%02x", bridge_busnr);
+        if(*p != ':') {
+                err("Invalid hotplug bus bridge device");
+                return -EINVAL;
+        }
+        str = p + 1;
+        tmp = simple_strtoul(str, &p, 16);
+        if(p == str || tmp > 0x1f) {
+                err("Invalid hotplug bus bridge device slot number");
+                return -EINVAL;
+        }
+        bridge_slot = (u8) tmp;
+        dbg("bridge_slot = 0x%02x", bridge_slot);
+
+        dbg("first_slot = 0x%02x", first_slot);
+        dbg("last_slot = 0x%02x", last_slot);
+        if(!(first_slot && last_slot)) {
+                err("Need to specify first_slot and last_slot");
+                return -EINVAL;
+        }
+        if(last_slot < first_slot) {
+                err("first_slot must be less than last_slot");
+                return -EINVAL;
+        }
+
+        dbg("port = 0x%04x", port);
+        dbg("enum_bit = 0x%02x", enum_bit);
+        if(enum_bit > 7) {
+                err("Invalid #ENUM bit");
+                return -EINVAL;
+        }
+        enum_mask = 1 << enum_bit;
+        return 0;
+}
+
+static int query_enum(void)
+{
+        u8 value;
+
+        value = inb_p(port);
+        return ((value & enum_mask) == enum_mask);
+}
+
+static int __init cpcihp_generic_init(void)
+{
+        int status;
+        struct resource* r;
+        struct pci_dev* dev;
+
+        info(DRIVER_DESC " version: " DRIVER_VERSION);
+        status = validate_parameters();
+        if(status != 0)
+                return status;
+
+        r = request_region(port, 1, "#ENUM hotswap signal register");
+        if(!r)
+                return -EBUSY;
+
+        dev = pci_find_slot(bridge_busnr, PCI_DEVFN(bridge_slot, 0));
+        if(!dev || dev->hdr_type != PCI_HEADER_TYPE_BRIDGE) {
+                err("Invalid bridge device %s", bridge);
+                return -EINVAL;
+        }
+        bus = dev->subordinate;
+
+        memset(&generic_hpc, 0, sizeof (struct cpci_hp_controller));
+        generic_hpc_ops.query_enum = query_enum;
+        generic_hpc.ops = &generic_hpc_ops;
+
+        status = cpci_hp_register_controller(&generic_hpc);
+        if(status != 0) {
+                err("Could not register cPCI hotplug controller");
+                return -ENODEV;
+        }
+        dbg("registered controller");
+
+        status = cpci_hp_register_bus(bus, first_slot, last_slot);
+        if(status != 0) {
+                err("Could not register cPCI hotplug bus");
+                goto init_bus_register_error;
+        }
+        dbg("registered bus");
+
+        status = cpci_hp_start();
+        if(status != 0) {
+                err("Could not started cPCI hotplug system");
+                goto init_start_error;
+        }
+        dbg("started cpci hp system");
+        return 0;
+init_start_error:
+        cpci_hp_unregister_bus(bus);
+init_bus_register_error:
+        cpci_hp_unregister_controller(&generic_hpc);
+        err("status = %d", status);
+        return status;
+
+}
+
+static void __exit cpcihp_generic_exit(void)
+{
+        cpci_hp_stop();
+        cpci_hp_unregister_bus(bus);
+        cpci_hp_unregister_controller(&generic_hpc);
+        release_region(port, 1);
+}
+
+module_init(cpcihp_generic_init);
+module_exit(cpcihp_generic_exit);
+
+MODULE_AUTHOR(DRIVER_AUTHOR);
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_LICENSE("GPL");
+module_param(debug, bool, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(debug, "Debugging mode enabled or not");
+module_param(bridge, charp, 0);
+MODULE_PARM_DESC(bridge, "Hotswap bus bridge device, <bus>:<slot> (bus and slot are in hexadecimal)");
+module_param(first_slot, byte, 0);
+MODULE_PARM_DESC(first_slot, "Hotswap bus first slot number");
+module_param(last_slot, byte, 0);
+MODULE_PARM_DESC(last_slot, "Hotswap bus last slot number");
+module_param(port, ushort, 0);
+MODULE_PARM_DESC(port, "#ENUM signal I/O port");
+module_param(enum_bit, uint, 0);
+MODULE_PARM_DESC(enum_bit, "#ENUM signal bit (0-7)");