mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
147 lines
3.4 KiB
147 lines
3.4 KiB
// SPDX-License-Identifier: GPL-2.0-only |
|
/* |
|
* uio_aec.c -- simple driver for Adrienne Electronics Corp time code PCI device |
|
* |
|
* Copyright (C) 2008 Brandon Philips <[email protected]> |
|
*/ |
|
|
|
#include <linux/kernel.h> |
|
#include <linux/module.h> |
|
#include <linux/pci.h> |
|
#include <linux/init.h> |
|
#include <linux/interrupt.h> |
|
#include <linux/cdev.h> |
|
#include <linux/fs.h> |
|
#include <linux/io.h> |
|
#include <linux/uaccess.h> |
|
#include <linux/uio_driver.h> |
|
#include <linux/slab.h> |
|
|
|
#define PCI_VENDOR_ID_AEC 0xaecb |
|
#define PCI_DEVICE_ID_AEC_VITCLTC 0x6250 |
|
|
|
#define INT_ENABLE_ADDR 0xFC |
|
#define INT_ENABLE 0x10 |
|
#define INT_DISABLE 0x0 |
|
|
|
#define INT_MASK_ADDR 0x2E |
|
#define INT_MASK_ALL 0x3F |
|
|
|
#define INTA_DRVR_ADDR 0xFE |
|
#define INTA_ENABLED_FLAG 0x08 |
|
#define INTA_FLAG 0x01 |
|
|
|
#define MAILBOX 0x0F |
|
|
|
static struct pci_device_id ids[] = { |
|
{ PCI_DEVICE(PCI_VENDOR_ID_AEC, PCI_DEVICE_ID_AEC_VITCLTC), }, |
|
{ 0, } |
|
}; |
|
MODULE_DEVICE_TABLE(pci, ids); |
|
|
|
static irqreturn_t aectc_irq(int irq, struct uio_info *dev_info) |
|
{ |
|
void __iomem *int_flag = dev_info->priv + INTA_DRVR_ADDR; |
|
unsigned char status = ioread8(int_flag); |
|
|
|
|
|
if ((status & INTA_ENABLED_FLAG) && (status & INTA_FLAG)) { |
|
/* application writes 0x00 to 0x2F to get next interrupt */ |
|
status = ioread8(dev_info->priv + MAILBOX); |
|
return IRQ_HANDLED; |
|
} |
|
|
|
return IRQ_NONE; |
|
} |
|
|
|
static void print_board_data(struct pci_dev *pdev, struct uio_info *i) |
|
{ |
|
dev_info(&pdev->dev, "PCI-TC board vendor: %x%x number: %x%x" |
|
" revision: %c%c\n", |
|
ioread8(i->priv + 0x01), |
|
ioread8(i->priv + 0x00), |
|
ioread8(i->priv + 0x03), |
|
ioread8(i->priv + 0x02), |
|
ioread8(i->priv + 0x06), |
|
ioread8(i->priv + 0x07)); |
|
} |
|
|
|
static int probe(struct pci_dev *pdev, const struct pci_device_id *id) |
|
{ |
|
struct uio_info *info; |
|
int ret; |
|
|
|
info = devm_kzalloc(&pdev->dev, sizeof(struct uio_info), GFP_KERNEL); |
|
if (!info) |
|
return -ENOMEM; |
|
|
|
if (pci_enable_device(pdev)) |
|
return -ENODEV; |
|
|
|
if (pci_request_regions(pdev, "aectc")) |
|
goto out_disable; |
|
|
|
info->name = "aectc"; |
|
info->port[0].start = pci_resource_start(pdev, 0); |
|
if (!info->port[0].start) |
|
goto out_release; |
|
info->priv = pci_iomap(pdev, 0, 0); |
|
if (!info->priv) |
|
goto out_release; |
|
info->port[0].size = pci_resource_len(pdev, 0); |
|
info->port[0].porttype = UIO_PORT_GPIO; |
|
|
|
info->version = "0.0.1"; |
|
info->irq = pdev->irq; |
|
info->irq_flags = IRQF_SHARED; |
|
info->handler = aectc_irq; |
|
|
|
print_board_data(pdev, info); |
|
ret = uio_register_device(&pdev->dev, info); |
|
if (ret) |
|
goto out_unmap; |
|
|
|
iowrite32(INT_ENABLE, info->priv + INT_ENABLE_ADDR); |
|
iowrite8(INT_MASK_ALL, info->priv + INT_MASK_ADDR); |
|
if (!(ioread8(info->priv + INTA_DRVR_ADDR) |
|
& INTA_ENABLED_FLAG)) |
|
dev_err(&pdev->dev, "aectc: interrupts not enabled\n"); |
|
|
|
pci_set_drvdata(pdev, info); |
|
|
|
return 0; |
|
|
|
out_unmap: |
|
pci_iounmap(pdev, info->priv); |
|
out_release: |
|
pci_release_regions(pdev); |
|
out_disable: |
|
pci_disable_device(pdev); |
|
return -ENODEV; |
|
} |
|
|
|
static void remove(struct pci_dev *pdev) |
|
{ |
|
struct uio_info *info = pci_get_drvdata(pdev); |
|
|
|
/* disable interrupts */ |
|
iowrite8(INT_DISABLE, info->priv + INT_MASK_ADDR); |
|
iowrite32(INT_DISABLE, info->priv + INT_ENABLE_ADDR); |
|
/* read mailbox to ensure board drops irq */ |
|
ioread8(info->priv + MAILBOX); |
|
|
|
uio_unregister_device(info); |
|
pci_release_regions(pdev); |
|
pci_disable_device(pdev); |
|
iounmap(info->priv); |
|
} |
|
|
|
static struct pci_driver pci_driver = { |
|
.name = "aectc", |
|
.id_table = ids, |
|
.probe = probe, |
|
.remove = remove, |
|
}; |
|
|
|
module_pci_driver(pci_driver); |
|
MODULE_LICENSE("GPL");
|
|
|