329 lines
8.4 KiB
C
329 lines
8.4 KiB
C
/*
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* cpcihp_zt5550.c
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*
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* Intel/Ziatech ZT5550 CompactPCI Host Controller driver
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*
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* Copyright 2002 SOMA Networks, Inc.
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* Copyright 2001 Intel San Luis Obispo
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* Copyright 2000,2001 MontaVista Software Inc.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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* THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* Send feedback to <scottm@somanetworks.com>
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*/
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/init.h>
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#include <linux/errno.h>
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#include <linux/pci.h>
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#include <linux/interrupt.h>
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#include <linux/signal.h> /* IRQF_SHARED */
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#include "cpci_hotplug.h"
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#include "cpcihp_zt5550.h"
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#define DRIVER_VERSION "0.2"
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#define DRIVER_AUTHOR "Scott Murray <scottm@somanetworks.com>"
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#define DRIVER_DESC "ZT5550 CompactPCI Hot Plug Driver"
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#define MY_NAME "cpcihp_zt5550"
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#define dbg(format, arg...) \
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do { \
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if(debug) \
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printk (KERN_DEBUG "%s: " format "\n", \
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MY_NAME , ## arg); \
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} while(0)
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#define err(format, arg...) printk(KERN_ERR "%s: " format "\n", MY_NAME , ## arg)
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#define info(format, arg...) printk(KERN_INFO "%s: " format "\n", MY_NAME , ## arg)
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#define warn(format, arg...) printk(KERN_WARNING "%s: " format "\n", MY_NAME , ## arg)
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/* local variables */
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static bool debug;
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static bool poll;
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static struct cpci_hp_controller_ops zt5550_hpc_ops;
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static struct cpci_hp_controller zt5550_hpc;
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/* Primary cPCI bus bridge device */
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static struct pci_dev *bus0_dev;
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static struct pci_bus *bus0;
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/* Host controller device */
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static struct pci_dev *hc_dev;
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/* Host controller register addresses */
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static void __iomem *hc_registers;
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static void __iomem *csr_hc_index;
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static void __iomem *csr_hc_data;
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static void __iomem *csr_int_status;
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static void __iomem *csr_int_mask;
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static int zt5550_hc_config(struct pci_dev *pdev)
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{
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int ret;
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/* Since we know that no boards exist with two HC chips, treat it as an error */
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if(hc_dev) {
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err("too many host controller devices?");
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return -EBUSY;
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}
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ret = pci_enable_device(pdev);
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if(ret) {
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err("cannot enable %s\n", pci_name(pdev));
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return ret;
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}
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hc_dev = pdev;
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dbg("hc_dev = %p", hc_dev);
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dbg("pci resource start %llx", (unsigned long long)pci_resource_start(hc_dev, 1));
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dbg("pci resource len %llx", (unsigned long long)pci_resource_len(hc_dev, 1));
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if(!request_mem_region(pci_resource_start(hc_dev, 1),
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pci_resource_len(hc_dev, 1), MY_NAME)) {
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err("cannot reserve MMIO region");
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ret = -ENOMEM;
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goto exit_disable_device;
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}
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hc_registers =
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ioremap(pci_resource_start(hc_dev, 1), pci_resource_len(hc_dev, 1));
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if(!hc_registers) {
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err("cannot remap MMIO region %llx @ %llx",
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(unsigned long long)pci_resource_len(hc_dev, 1),
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(unsigned long long)pci_resource_start(hc_dev, 1));
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ret = -ENODEV;
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goto exit_release_region;
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}
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csr_hc_index = hc_registers + CSR_HCINDEX;
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csr_hc_data = hc_registers + CSR_HCDATA;
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csr_int_status = hc_registers + CSR_INTSTAT;
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csr_int_mask = hc_registers + CSR_INTMASK;
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/*
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* Disable host control, fault and serial interrupts
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*/
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dbg("disabling host control, fault and serial interrupts");
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writeb((u8) HC_INT_MASK_REG, csr_hc_index);
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writeb((u8) ALL_INDEXED_INTS_MASK, csr_hc_data);
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dbg("disabled host control, fault and serial interrupts");
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/*
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* Disable timer0, timer1 and ENUM interrupts
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*/
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dbg("disabling timer0, timer1 and ENUM interrupts");
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writeb((u8) ALL_DIRECT_INTS_MASK, csr_int_mask);
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dbg("disabled timer0, timer1 and ENUM interrupts");
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return 0;
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exit_release_region:
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release_mem_region(pci_resource_start(hc_dev, 1),
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pci_resource_len(hc_dev, 1));
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exit_disable_device:
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pci_disable_device(hc_dev);
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return ret;
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}
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static int zt5550_hc_cleanup(void)
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{
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if(!hc_dev)
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return -ENODEV;
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iounmap(hc_registers);
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release_mem_region(pci_resource_start(hc_dev, 1),
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pci_resource_len(hc_dev, 1));
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pci_disable_device(hc_dev);
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return 0;
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}
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static int zt5550_hc_query_enum(void)
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{
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u8 value;
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value = inb_p(ENUM_PORT);
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return ((value & ENUM_MASK) == ENUM_MASK);
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}
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static int zt5550_hc_check_irq(void *dev_id)
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{
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int ret;
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u8 reg;
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ret = 0;
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if(dev_id == zt5550_hpc.dev_id) {
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reg = readb(csr_int_status);
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if(reg)
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ret = 1;
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}
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return ret;
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}
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static int zt5550_hc_enable_irq(void)
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{
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u8 reg;
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if(hc_dev == NULL) {
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return -ENODEV;
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}
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reg = readb(csr_int_mask);
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reg = reg & ~ENUM_INT_MASK;
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writeb(reg, csr_int_mask);
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return 0;
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}
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static int zt5550_hc_disable_irq(void)
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{
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u8 reg;
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if(hc_dev == NULL) {
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return -ENODEV;
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}
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reg = readb(csr_int_mask);
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reg = reg | ENUM_INT_MASK;
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writeb(reg, csr_int_mask);
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return 0;
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}
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static int zt5550_hc_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
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{
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int status;
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status = zt5550_hc_config(pdev);
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if(status != 0) {
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return status;
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}
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dbg("returned from zt5550_hc_config");
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memset(&zt5550_hpc, 0, sizeof (struct cpci_hp_controller));
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zt5550_hpc_ops.query_enum = zt5550_hc_query_enum;
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zt5550_hpc.ops = &zt5550_hpc_ops;
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if(!poll) {
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zt5550_hpc.irq = hc_dev->irq;
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zt5550_hpc.irq_flags = IRQF_SHARED;
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zt5550_hpc.dev_id = hc_dev;
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zt5550_hpc_ops.enable_irq = zt5550_hc_enable_irq;
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zt5550_hpc_ops.disable_irq = zt5550_hc_disable_irq;
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zt5550_hpc_ops.check_irq = zt5550_hc_check_irq;
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} else {
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info("using ENUM# polling mode");
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}
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status = cpci_hp_register_controller(&zt5550_hpc);
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if(status != 0) {
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err("could not register cPCI hotplug controller");
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goto init_hc_error;
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}
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dbg("registered controller");
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/* Look for first device matching cPCI bus's bridge vendor and device IDs */
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if(!(bus0_dev = pci_get_device(PCI_VENDOR_ID_DEC,
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PCI_DEVICE_ID_DEC_21154, NULL))) {
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status = -ENODEV;
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goto init_register_error;
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}
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bus0 = bus0_dev->subordinate;
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pci_dev_put(bus0_dev);
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status = cpci_hp_register_bus(bus0, 0x0a, 0x0f);
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if(status != 0) {
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err("could not register cPCI hotplug bus");
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goto init_register_error;
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}
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dbg("registered bus");
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status = cpci_hp_start();
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if(status != 0) {
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err("could not started cPCI hotplug system");
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cpci_hp_unregister_bus(bus0);
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goto init_register_error;
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}
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dbg("started cpci hp system");
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return 0;
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init_register_error:
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cpci_hp_unregister_controller(&zt5550_hpc);
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init_hc_error:
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err("status = %d", status);
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zt5550_hc_cleanup();
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return status;
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}
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static void __devexit zt5550_hc_remove_one(struct pci_dev *pdev)
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{
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cpci_hp_stop();
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cpci_hp_unregister_bus(bus0);
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cpci_hp_unregister_controller(&zt5550_hpc);
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zt5550_hc_cleanup();
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}
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static struct pci_device_id zt5550_hc_pci_tbl[] = {
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{ PCI_VENDOR_ID_ZIATECH, PCI_DEVICE_ID_ZIATECH_5550_HC, PCI_ANY_ID, PCI_ANY_ID, },
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{ 0, }
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};
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MODULE_DEVICE_TABLE(pci, zt5550_hc_pci_tbl);
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static struct pci_driver zt5550_hc_driver = {
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.name = "zt5550_hc",
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.id_table = zt5550_hc_pci_tbl,
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.probe = zt5550_hc_init_one,
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.remove = __devexit_p(zt5550_hc_remove_one),
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};
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static int __init zt5550_init(void)
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{
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struct resource* r;
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int rc;
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info(DRIVER_DESC " version: " DRIVER_VERSION);
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r = request_region(ENUM_PORT, 1, "#ENUM hotswap signal register");
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if(!r)
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return -EBUSY;
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rc = pci_register_driver(&zt5550_hc_driver);
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if(rc < 0)
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release_region(ENUM_PORT, 1);
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return rc;
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}
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static void __exit
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zt5550_exit(void)
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{
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pci_unregister_driver(&zt5550_hc_driver);
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release_region(ENUM_PORT, 1);
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}
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module_init(zt5550_init);
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module_exit(zt5550_exit);
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MODULE_AUTHOR(DRIVER_AUTHOR);
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MODULE_DESCRIPTION(DRIVER_DESC);
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MODULE_LICENSE("GPL");
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module_param(debug, bool, 0644);
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MODULE_PARM_DESC(debug, "Debugging mode enabled or not");
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module_param(poll, bool, 0644);
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MODULE_PARM_DESC(poll, "#ENUM polling mode enabled or not");
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