/*
* cpcihp_zt5550.c
*
* Intel/Ziatech ZT5550 CompactPCI Host Controller 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.
*
* Send feedback to <scottm@somanetworks.com>
*/
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/pci.h>
#include <linux/interrupt.h>
#include <linux/signal.h> /* IRQF_SHARED */
#include "cpci_hotplug.h"
#include "cpcihp_zt5550.h"
#define DRIVER_VERSION "0.2"
#define DRIVER_AUTHOR "Scott Murray <scottm@somanetworks.com>"
#define DRIVER_DESC "ZT5550 CompactPCI Hot Plug Driver"
#define MY_NAME "cpcihp_zt5550"
#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 bool debug;
static bool poll;
static struct cpci_hp_controller_ops zt5550_hpc_ops;
static struct cpci_hp_controller zt5550_hpc;
/* Primary cPCI bus bridge device */
static struct pci_dev *bus0_dev;
static struct pci_bus *bus0;
/* Host controller device */
static struct pci_dev *hc_dev;
/* Host controller register addresses */
static void __iomem *hc_registers;
static void __iomem *csr_hc_index;
static void __iomem *csr_hc_data;
static void __iomem *csr_int_status;
static void __iomem *csr_int_mask;
static int zt5550_hc_config(struct pci_dev *pdev)
{
int ret;
/* Since we know that no boards exist with two HC chips, treat it as an error */
if(hc_dev) {
err("too many host controller devices?");
return -EBUSY;
}
ret = pci_enable_device(pdev);
if(ret) {
err("cannot enable %s\n", pci_name(pdev));
return ret;
}
hc_dev = pdev;
dbg("hc_dev = %p", hc_dev);
dbg("pci resource start %llx", (unsigned long long)pci_resource_start(hc_dev, 1));
dbg("pci resource len %llx", (unsigned long long)pci_resource_len(hc_dev, 1));
if(!request_mem_region(pci_resource_start(hc_dev, 1),
pci_resource_len(hc_dev, 1), MY_NAME)) {
err("cannot reserve MMIO region");
ret = -ENOMEM;
goto exit_disable_device;
}
hc_registers =
ioremap(pci_resource_start(hc_dev, 1), pci_resource_len(hc_dev, 1));
if(!hc_registers) {
err("cannot remap MMIO region %llx @ %llx",
(unsigned long long)pci_resource_len(hc_dev, 1),
(unsigned long long)pci_resource_start(hc_dev, 1));
ret = -ENODEV;
goto exit_release_region;
}
csr_hc_index = hc_registers + CSR_HCINDEX;
csr_hc_data = hc_registers + CSR_HCDATA;
csr_int_status = hc_registers + CSR_INTSTAT;
csr_int_mask = hc_registers + CSR_INTMASK;
/*
* Disable host control, fault and serial interrupts
*/
dbg("disabling host control, fault and serial interrupts");
writeb((u8) HC_INT_MASK_REG, csr_hc_index);
writeb((u8) ALL_INDEXED_INTS_MASK, csr_hc_data);
dbg("disabled host control, fault and serial interrupts");
/*
* Disable timer0, timer1 and ENUM interrupts
*/
dbg("disabling timer0, timer1 and ENUM interrupts");
writeb((u8) ALL_DIRECT_INTS_MASK, csr_int_mask);
dbg("disabled timer0, timer1 and ENUM interrupts");
return 0;
exit_release_region:
release_mem_region(pci_resource_start(hc_dev, 1),
pci_resource_len(hc_dev, 1));
exit_disable_device:
pci_disable_device(hc_dev);
return ret;
}
static int zt5550_hc_cleanup(void)
{
if(!hc_dev)
return -ENODEV;
iounmap(hc_registers);
release_mem_region(pci_resource_start(hc_dev, 1),
pci_resource_len(hc_dev, 1));
pci_disable_device(hc_dev);
return 0;
}
static int zt5550_hc_query_enum(void)
{
u8 value;
value = inb_p(ENUM_PORT);
return ((value & ENUM_MASK) == ENUM_MASK);
}
static int zt5550_hc_check_irq(void *dev_id)
{
int ret;
u8 reg;
ret = 0;
if(dev_id == zt5550_hpc.dev_id) {
reg = readb(csr_int_status);
if(reg)
ret = 1;
}
return ret;
}
static int zt5550_hc_enable_irq(void)
{
u8 reg;
if(hc_dev == NULL) {
return -ENODEV;
}
reg = readb(csr_int_mask);
reg = reg & ~ENUM_INT_MASK;
writeb(reg, csr_int_mask);
return 0;
}
static int zt5550_hc_disable_irq(void)
{
u8 reg;
if(hc_dev == NULL) {
return -ENODEV;
}
reg = readb(csr_int_mask);
reg = reg | ENUM_INT_MASK;
writeb(reg, csr_int_mask);
return 0;
}
static int zt5550_hc_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
{
int status;
status = zt5550_hc_config(pdev);
if(status != 0) {
return status;
}
dbg("returned from zt5550_hc_config");
memset(&zt5550_hpc, 0, sizeof (struct cpci_hp_controller));
zt5550_hpc_ops.query_enum = zt5550_hc_query_enum;
zt5550_hpc.ops = &zt5550_hpc_ops;
if(!poll) {
zt5550_hpc.irq = hc_dev->irq;
zt5550_hpc.irq_flags = IRQF_SHARED;
zt5550_hpc.dev_id = hc_dev;
zt5550_hpc_ops.enable_irq = zt5550_hc_enable_irq;
zt5550_hpc_ops.disable_irq = zt5550_hc_disable_irq;
zt5550_hpc_ops.check_irq = zt5550_hc_check_irq;
} else {
info("using ENUM# polling mode");
}
status = cpci_hp_register_controller(&zt5550_hpc);
if(status != 0) {
err("could not register cPCI hotplug controller");
goto init_hc_error;
}
dbg("registered controller");
/* Look for first device matching cPCI bus's bridge vendor and device IDs */
if(!(bus0_dev = pci_get_device(PCI_VENDOR_ID_DEC,
PCI_DEVICE_ID_DEC_21154, NULL))) {
status = -ENODEV;
goto init_register_error;
}
bus0 = bus0_dev->subordinate;
pci_dev_put(bus0_dev);
status = cpci_hp_register_bus(bus0, 0x0a, 0x0f);
if(status != 0) {
err("could not register cPCI hotplug bus");
goto init_register_error;
}
dbg("registered bus");
status = cpci_hp_start();
if(status != 0) {
err("could not started cPCI hotplug system");
cpci_hp_unregister_bus(bus0);
goto init_register_error;
}
dbg("started cpci hp system");
return 0;
init_register_error:
cpci_hp_unregister_controller(&zt5550_hpc);
init_hc_error:
err("status = %d", status);
zt5550_hc_cleanup();
return status;
}
static void zt5550_hc_remove_one(struct pci_dev *pdev)
{
cpci_hp_stop();
cpci_hp_unregister_bus(bus0);
cpci_hp_unregister_controller(&zt5550_hpc);
zt5550_hc_cleanup();
}
static struct pci_device_id zt5550_hc_pci_tbl[] = {
{ PCI_VENDOR_ID_ZIATECH, PCI_DEVICE_ID_ZIATECH_5550_HC, PCI_ANY_ID, PCI_ANY_ID, },
{ 0, }
};
MODULE_DEVICE_TABLE(pci, zt5550_hc_pci_tbl);
static struct pci_driver zt5550_hc_driver = {
.name = "zt5550_hc",
.id_table = zt5550_hc_pci_tbl,
.probe = zt5550_hc_init_one,
.remove = zt5550_hc_remove_one,
};
static int __init zt5550_init(void)
{
struct resource* r;
int rc;
info(DRIVER_DESC " version: " DRIVER_VERSION);
r = request_region(ENUM_PORT, 1, "#ENUM hotswap signal register");
if(!r)
return -EBUSY;
rc = pci_register_driver(&zt5550_hc_driver);
if(rc < 0)
release_region(ENUM_PORT, 1);
return rc;
}
static void __exit
zt5550_exit(void)
{
pci_unregister_driver(&zt5550_hc_driver);
release_region(ENUM_PORT, 1);
}
module_init(zt5550_init);
module_exit(zt5550_exit);
MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");
module_param(debug, bool, 0644);
MODULE_PARM_DESC(debug, "Debugging mode enabled or not");
module_param(poll, bool, 0644);
MODULE_PARM_DESC(poll, "#ENUM polling mode enabled or not");
