diff options
Diffstat (limited to 'drivers/pci/hotplug/cpcihp_zt5550.c')
| -rw-r--r-- | drivers/pci/hotplug/cpcihp_zt5550.c | 328 |
1 files changed, 328 insertions, 0 deletions
diff --git a/drivers/pci/hotplug/cpcihp_zt5550.c b/drivers/pci/hotplug/cpcihp_zt5550.c new file mode 100644 index 00000000..6bf8d2ab --- /dev/null +++ b/drivers/pci/hotplug/cpcihp_zt5550.c @@ -0,0 +1,328 @@ +/* + * 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 __devexit 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 = __devexit_p(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"); |