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#ifndef thing_H #define thing_H #define DEVICE_NAME "thing" #define DRIVER_NAME "thing" struct context { uint card; // cards probed struct pci_dev *pdev; // pci dev void *buf1; // DMA download data dma_addr_t buf1_dma_handle; // physical address of the DMA download region struct cdev cdev; // char dev uint opens; // XXX do I really need to know this? uint32_t pci_mem_start; // pci config space uint32_t pci_mem_length; // pci config space void __iomem *bar0_base_addr; // the BARs were mapped here int irq; // our IRQ }; static int thing_probe(struct pci_dev *, const struct pci_device_id *); static void thing_remove(struct pci_dev *); static int fops_open (struct inode *, struct file *); static ssize_t fops_read(struct file *, char __user *, size_t, loff_t *); static ssize_t fops_write(struct file *, const char __user *, size_t, loff_t *); static irqreturn_t thing_isr(int, void *); static int fops_release (struct inode *, struct file *); #endif //thing_H |
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#include <linux/cma.h> #include <linux/device.h> #include <linux/dma-mapping.h> #include <linux/fs.h> #include <linux/gfp.h> #include <linux/init.h> #include <linux/kernel.h> /* Needed for KERN_INFO */ #include <linux/mm.h> #include <linux/module.h> /* Needed by all modules */ #include <linux/pci.h> #include <stddef.h> #include <linux/cdev.h> #include <linux/uaccess.h> #include <linux/delay.h> #include "thing.h" #define DEVICE_NAME "thing" #define DRIVER_NAME "thing" MODULE_LICENSE("GPL"); // The license type -- this affects available functionality MODULE_AUTHOR("Tim Allen"); // The author -- visible when you use modinfo MODULE_DESCRIPTION("thing accelerator Driver"); MODULE_VERSION("0.1"); // A version number to inform users static const size_t dbsize = 16 * 1024; static struct class *class; static struct device *device_file; static struct context *ctxs[8]; //up to 8 cards // define which file operations are supported struct file_operations fops = { .owner = THIS_MODULE, .llseek = NULL, .read = fops_read, .write = fops_write, .poll = NULL, .unlocked_ioctl = NULL, .mmap = NULL, //mmap .open = fops_open, //open .flush = NULL, .release = fops_release, //close .fsync = NULL, .fasync = NULL, .lock = NULL, }; static const struct pci_device_id pci_device_ids[] = { {PCI_DEVICE(0x1002, 0x6610)}, // some GPU card I'm using for dev {PCI_DEVICE(0x1234, 0x000a)}, // hsp card {PCI_DEVICE(0x1234, 0x000b)}, // our card {0, /* end of list */}, }; static struct pci_driver thing_driver = { .name = DRIVER_NAME, .id_table = pci_device_ids, .probe = thing_probe, .remove = thing_remove, }; /** init is the entry point for the module * */ static int __init thing_init(void) { class = class_create(THIS_MODULE, "thing"); if(!class) { printk (KERN_ERR "[%s:init] unable to create class device", DRIVER_NAME); return -EIO; } if (pci_register_driver(&thing_driver) < 0) { printk(KERN_ERR "[%s:init] unable to register", DRIVER_NAME); return -EIO; } printk(KERN_INFO "[%s:init] driver registered", DRIVER_NAME); return 0; // A non 0 return means init_module failed; module can't be loaded. } module_init(thing_init); // this macro registers the module entry point /** a card has been inserted, time to set it up * */ static int thing_probe(struct pci_dev *pdev, const struct pci_device_id *id) { int err; uint8_t byte = 0; uint16_t word = 0; uint32_t dword = 0; char devfilename[255]; struct context *ctx; static int cards = 0; //begin filling out the context struct ctx = kmalloc(sizeof (struct context), GFP_KERNEL); memset(ctx, 0, sizeof (struct context)); ctxs[cards] = ctx; // store *ctx indexed by card probe order pci_set_drvdata(pdev, (void*)ctx); // store *ctx indexed by pdev ctx->card = cards++; // card number in arbitrary order ctx->pdev = pdev; err = pci_enable_device(pdev); if (err) { printk(KERN_ERR "[%s:probe] pci_enable_device returned %d", DRIVER_NAME, err); return -ENODEV; } err = pci_request_region(pdev, 0, DRIVER_NAME); if (err) { printk(KERN_ERR "[%s:probe] request_region returned %d", DRIVER_NAME, err); return -ENODEV; } // say some useless stuff about the card pci_read_config_word(pdev, PCI_VENDOR_ID, &word); printk(KERN_INFO "[%s:probe] PCI_VENDOR_ID: %4.4x", DRIVER_NAME, word); pci_read_config_word(pdev, PCI_DEVICE_ID, &word); printk(KERN_INFO "[%s:probe] PCI_DEVICE_ID: %4.4x", DRIVER_NAME, word); pci_read_config_word(pdev, PCI_COMMAND, &word); printk(KERN_INFO "[%s:probe] PCI_COMMAND: %4.4x", DRIVER_NAME, word); pci_read_config_word(pdev, PCI_STATUS, &word); printk(KERN_INFO "[%s:probe] PCI_STATUS: %4.4x", DRIVER_NAME, word); pci_read_config_byte(pdev, PCI_REVISION_ID, &byte); printk(KERN_INFO "[%s:probe] PCI_REVISION_ID: %2.2x", DRIVER_NAME, byte); pci_read_config_byte(pdev, PCI_INTERRUPT_LINE, &byte); printk(KERN_INFO "[%s:probe] PCI_INTERRUPT_LINE: %2.2x", DRIVER_NAME, byte); pci_read_config_byte(pdev, PCI_INTERRUPT_PIN, &byte); printk(KERN_INFO "[%s:probe] PCI_INTERRUPT_PIN: %2.2x", DRIVER_NAME, byte); ctx->pci_mem_start = pci_resource_start(pdev, 0); ctx->pci_mem_length = pci_resource_len(pdev, 0); pci_read_config_dword(pdev, ctx->pci_mem_start, &dword); printk(KERN_INFO "[%s:probe] device_info: %8.8x", DRIVER_NAME, dword); pci_read_config_dword(pdev, ctx->pci_mem_start + 0x3c, &dword); printk(KERN_INFO "[%s:probe] revision_number: %8.8x", DRIVER_NAME, dword); ctx->bar0_base_addr = pci_iomap(pdev, 0, ctx->pci_mem_length); // map the BARs printk(KERN_INFO "[%s:probe] bar0_base_addr: %p", DRIVER_NAME, ctx->bar0_base_addr); // create the device file entry (/dev/thing) snprintf(devfilename, sizeof devfilename, "thing%d", ctx->card); device_file = device_create(class, NULL, MKDEV(810, ctx->card), 0, devfilename); if(!device_file) { printk (KERN_ERR "[%s:init] unable to create device class device", DRIVER_NAME); return -EIO; } else { printk(KERN_INFO "[%s:probe] device %s created.", DRIVER_NAME, devfilename); } // set-up file ops cdev_init(&ctx->cdev, &fops); ctx->cdev.owner = THIS_MODULE; ctx->cdev.ops = &fops; err = cdev_add(&ctx->cdev, MKDEV(810, ctx->card), 1); if (err) { printk(KERN_INFO "[%s:probe] cdev_add failed with %d", DRIVER_NAME, err); return -EIO; } // set-up the DMA buffers err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32)); if (err) { printk(KERN_INFO "[%s:probe] dma_set_mask returned: %d", DRIVER_NAME, err); return -EIO; } ctx->buf1 = dma_alloc_coherent(&pdev->dev, dbsize, &ctx->buf1_dma_handle, GFP_KERNEL); if (!ctx->buf1) { printk(KERN_ALERT "[%s:probe] failed to allocate coherent buffer", DRIVER_NAME); return -EIO; } printk(KERN_INFO "[%s:probe] buf1 = %p buf1_dma_handle = %16.16llx ", DRIVER_NAME, ctx->buf1, ctx->buf1_dma_handle); iowrite32(ctx->buf1_dma_handle, ctx->bar0_base_addr + 0x140); // tell card where to DMA from // set-up IRQs err = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_MSI); printk(KERN_INFO "[%s:probe] pci_alloc_irq_vectors returns %d", DRIVER_NAME, err); ctx->irq = pci_irq_vector(pdev, 0); printk(KERN_INFO "[%s:probe] pci_irq_vector returns %d", DRIVER_NAME, ctx->irq); err = request_irq(ctx->irq, &thing_isr, IRQF_SHARED, DRIVER_NAME, ctx); printk(KERN_INFO "[%s:probe] request_irq returns %d", DRIVER_NAME, err); // config done dword = ioread32(ctx->bar0_base_addr + 0x00); dword |= 0x10000000; // config_done iowrite32(dword, ctx->bar0_base_addr + 0x00); return 0; // A non 0 return means init_module failed; module can't be loaded. } /** open function - called when the device file is opened * */ static int fops_open (struct inode *inode, struct file *filp) { int major, minor; int card; struct context *ctx; major = imajor(inode); card = minor = iminor(inode); ctx = ctxs[card]; printk(KERN_INFO "[%s:open] major = %d", DRIVER_NAME, major); printk(KERN_INFO "[%s:open] minor = %d", DRIVER_NAME, minor); ctx->opens++; return 0; } /** read function - called when the device file is written to * */ static ssize_t fops_read(struct file *filp, char __user *ubuf, size_t count, loff_t *offp) { char kbuf[512]; uint c = 0; //position in kbuf, start at 0 int card; // the minor tells us which card uint8_t byte = 0; uint16_t word = 0; uint32_t dword =0; struct context *ctx; card = iminor(filp->f_inode); ctx = ctxs[card]; printk(KERN_INFO "[%s:read] minor = %d count = %ld *offp = %lld", DRIVER_NAME, card, count, *offp); if (*offp) return 0; c += snprintf(&kbuf[c], sizeof kbuf, "read from card\t%d\n", card); pci_read_config_word(ctx->pdev, PCI_VENDOR_ID, &word); c += snprintf(&kbuf[c], sizeof kbuf, "PCI_VENDOR_ID:\t%4.4x\n", word); pci_read_config_word(ctx->pdev, PCI_DEVICE_ID, &word); c += snprintf(&kbuf[c], sizeof kbuf, "PCI_DEVICE_ID:\t%4.4x\n", word); pci_read_config_word(ctx->pdev, PCI_COMMAND, &word); c += snprintf(&kbuf[c], sizeof kbuf, "PCI_COMMAND:\t%4.4x\n", word); pci_read_config_word(ctx->pdev, PCI_STATUS, &word); c += snprintf(&kbuf[c], sizeof kbuf, "PCI_STATUS:\t%4.4x\n", word); pci_read_config_byte(ctx->pdev, PCI_REVISION_ID, &byte); c += snprintf(&kbuf[c], sizeof kbuf, "PCI_REV_ID:\t%2.2x\n", byte); dword = ioread32(ctx->bar0_base_addr + 0x00); c += snprintf(&kbuf[c], sizeof kbuf, "DEV NFO:\t%8.8x\n", dword); dword = ioread32(ctx->bar0_base_addr + 0x04); c += snprintf(&kbuf[c], sizeof kbuf, "IRQ PND:\t%8.8x\n", dword); dword = ioread32(ctx->bar0_base_addr + 0x08); c += snprintf(&kbuf[c], sizeof kbuf, "IRQ ACK:\t%8.8x\n", dword); dword = ioread32(ctx->bar0_base_addr + 0x200); c += snprintf(&kbuf[c], sizeof kbuf, "FPGA Status:\t%8.8x\n", dword); copy_to_user(ubuf, kbuf, c); *offp += c; return c; } /** write function - called when the device file is written to * */ static ssize_t fops_write(struct file *filp, const char __user *buffer, size_t length, loff_t * offset) { int card; // the minor tells us which card struct context *ctx; card = iminor(filp->f_inode); ctx = ctxs[card]; if (length%32) printk(KERN_INFO "[%s:write] WARNING: not a mutiple of 32, sending anyway", DRIVER_NAME); if (length > 16*32) { printk(KERN_INFO "[%s:write] ERROR: maximum of 16", DRIVER_NAME); return -EIO; } printk(KERN_INFO "[%s:write] sent %ld of 'em", DRIVER_NAME, length / 32); memset(ctx->buf1, 0, dbsize); copy_from_user(ctx->buf1, buffer, length); iowrite32(length / 32, ctx->bar0_base_addr + 0x24); //number of 32B (256b) words to be downloaded to the card iowrite32(0x80000000, ctx->bar0_base_addr + 0x20); //Data0 Buffer and trigger ndelay(250); iowrite32(0x00000000, ctx->bar0_base_addr + 0x20); //Data0 Buffer and trigger return length; } /** Interrupt Service Routine * */ static irqreturn_t thing_isr(int irq, void *lp) { int irq_pending; //XXX ctxs, uh no, need em sorted by irq irq_pending = ioread32(ctxs[0]->bar0_base_addr + 0x04); printk(KERN_INFO "[%s:isr] RXd IRQ %d, irq_pending = %2.2x\n", DRIVER_NAME, irq, irq_pending); iowrite32(irq_pending, ctxs[0]->bar0_base_addr + 0x08); return IRQ_HANDLED; } /** close function - called when the device file is closed * */ static int fops_release (struct inode *inode, struct file *filp) { int major, minor; int card; struct context *ctx; major = imajor(inode); card = minor = iminor(inode); ctx = ctxs[card]; printk(KERN_INFO "[%s:release] major = %d", DRIVER_NAME, major); printk(KERN_INFO "[%s:release] minor = %d", DRIVER_NAME, minor); ctx->opens--; return 0; } /** remove a card * */ static void thing_remove(struct pci_dev *pdev) { struct context *ctx; ctx = (struct context*) pci_get_drvdata(pdev); printk(KERN_INFO "[%s:remove] free coherent buffer", DRIVER_NAME); if (ctx->buf1) dma_free_coherent(&pdev->dev, dbsize, ctx->buf1, ctx->buf1_dma_handle); free_irq(ctx->irq, ctx); pci_free_irq_vectors(pdev); device_destroy(class, MKDEV(810, ctx->card)); cdev_del(&ctx->cdev); pci_release_region(pdev, 0); pci_disable_device(pdev); kfree(ctx); } /** prepare to be gone * */ static void __exit thing_exit(void) { pci_unregister_driver(&thing_driver); printk(KERN_INFO "[%s:exit] driver unregistered", DRIVER_NAME); class_unregister(class); printk(KERN_INFO "[%s:exit] Goodbye world", DRIVER_NAME); } module_exit(thing_exit); // this macro registers the module exit point |