mirror of
https://github.com/54shady/kernel_drivers_examples.git
synced 2025-08-11 23:32:00 +00:00
Remove hello pci
This commit is contained in:
zeroway
@ -6,7 +6,6 @@ DEBFLAGS = -O2
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endif
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obj-m := crypto-drv.o
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obj-m := hello-pci-drv.o
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obj-m := virtio_mini.o
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KERNELDIR ?= /usr/src/linux
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CC ?= gcc
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@ -1,168 +0,0 @@
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#include <linux/module.h>
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#include <linux/device.h>
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#include <linux/pci.h>
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#include <linux/interrupt.h>
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#include <asm/io.h>
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#define HELLO_PCI_VENDOR 0x1337
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#define HELLO_PCI_DEVICE 0x0001
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#define HELLO_PCI_MAX_MAPS 1
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#define HELLO_PCI_MAX_PORT_REGIONS 1
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static struct pci_driver hello_pci;
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struct hello_pci_mem {
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const char *name;
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void __iomem *start;
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unsigned long size;
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};
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struct hello_pci_io {
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const char *name;
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unsigned long start;
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unsigned long size;
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};
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struct hello_pci_info {
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struct hello_pci_mem mem[HELLO_PCI_MAX_MAPS];
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struct hello_pci_io port[HELLO_PCI_MAX_PORT_REGIONS];
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u8 irq;
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};
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static irqreturn_t hello_pci_handler(int irq, void *dev_info)
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{
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struct hello_pci_info *info = (struct hello_pci_info *) dev_info;
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pr_alert("IRQ %d handled\n", irq);
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/* is it our device throwing an interrupt ? */
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if (inl(info->port[0].start)) {
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/* deassert it */
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outl(0, info->port[0].start );
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return IRQ_HANDLED;
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} else {
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/* not mine, we have done nothing */
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return IRQ_NONE;
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}
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}
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static int hello_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
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{
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struct hello_pci_info *info;
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info = kzalloc(sizeof(struct hello_pci_info), GFP_KERNEL);
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if (!info)
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return -ENOMEM;
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if (pci_enable_device(dev))
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goto out_free;
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pr_alert("hello_pci enabled device\n");
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if (pci_request_regions(dev, "hello_pci"))
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goto out_disable;
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pr_alert("hello_pci requested regions\n");
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/* BAR 0 has IO */
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info->port[0].name = "hello_pci-io";
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info->port[0].start = pci_resource_start(dev, 0);
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info->port[0].size = pci_resource_len(dev, 0);
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/* BAR 1 has MMIO */
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info->mem[0].name = "hello_pci-mmio";
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info->mem[0].start = pci_ioremap_bar(dev, 1);
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info->mem[0].size = pci_resource_len(dev, 1);
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if (!info->mem[0].start)
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goto out_unrequest;
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pr_alert("remaped addr for kernel uses\n");
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/* get device irq number */
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if (pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &info->irq))
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goto out_iounmap;
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/* request irq */
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if (devm_request_irq(&dev->dev, info->irq, hello_pci_handler, IRQF_SHARED, hello_pci.name, (void *) info))
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goto out_iounmap;
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/*
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* get a mmio reg value and change it
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* access mmio via ioread/iowrite
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*/
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pr_alert("mmio read device id=%x\n", ioread32(info->mem[0].start + 4));
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pr_alert("mmio write device id\n");
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iowrite32(0x4567, info->mem[0].start + 4);
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pr_alert("mmio read modified device id=%x\n", ioread32(info->mem[0].start + 4));
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/*
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* access pio via in/out
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*
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* assert an irq
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*/
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pr_alert("PIO write, assert an interrupt\n");
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outl(1, info->port[0].start);
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/* try dma without iommu */
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outl(1, info->port[0].start + 4);
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pci_set_drvdata(dev, info);
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return 0;
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out_iounmap:
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pr_alert("tic:probe_out:iounmap");
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iounmap(info->mem[0].start);
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out_unrequest:
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pr_alert("tic:probe_out_unrequest\n");
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pci_release_regions(dev);
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out_disable:
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pr_alert("tic:probe_out_disable\n");
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pci_disable_device(dev);
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out_free:
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pr_alert("tic:probe_out_free\n");
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kfree(info);
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return -ENODEV;
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}
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static void hello_pci_remove(struct pci_dev *dev)
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{
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/* we get back the driver data we store in
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* the pci_dev struct */
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struct hello_pci_info *info = pci_get_drvdata(dev);
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/* let's clean a little */
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pci_release_regions(dev);
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pci_disable_device(dev);
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iounmap(info->mem[0].start);
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kfree(info);
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}
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/*
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* vendor and device (+ subdevice and subvendor)
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* identifies a device we support
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*/
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static struct pci_device_id hello_pci_ids[] = {
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{ PCI_DEVICE(HELLO_PCI_VENDOR, HELLO_PCI_DEVICE) },
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{ 0, },
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};
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/* id_table describe the device this driver support
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* probe is called when a device we support exist and
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* when we are chosen to drive it.
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* remove is called when the driver is unloaded or
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* when the device disappears
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*/
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static struct pci_driver hello_pci = {
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.name = "hello_pci",
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.id_table = hello_pci_ids,
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.probe = hello_pci_probe,
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.remove = hello_pci_remove,
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};
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/* register driver in kernel pci framework */
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module_pci_driver(hello_pci);
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MODULE_DEVICE_TABLE(pci, hello_pci_ids);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("hello pci driver demo");
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MODULE_AUTHOR("zeroway");
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