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linux/drivers/media/pci/ddbridge/ddbridge-main.c
Su Hui 09b4195021 media: ddbridge: fix an error code problem in ddb_probe 
Error code is assigned to 'stat', return 'stat' rather than '-1'.

Signed-off-by: Su Hui <suhui@nfschina.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
2023-12-13 11:04:46 +01:00

314 lines
7.4 KiB
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// SPDX-License-Identifier: GPL-2.0
/*
* ddbridge.c: Digital Devices PCIe bridge driver
*
* Copyright (C) 2010-2017 Digital Devices GmbH
* Ralph Metzler <rjkm@metzlerbros.de>
* Marcus Metzler <mocm@metzlerbros.de>
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/module.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/poll.h>
#include <linux/io.h>
#include <linux/pci.h>
#include <linux/pci_ids.h>
#include <linux/timer.h>
#include <linux/i2c.h>
#include <linux/swab.h>
#include <linux/vmalloc.h>
#include "ddbridge.h"
#include "ddbridge-i2c.h"
#include "ddbridge-regs.h"
#include "ddbridge-hw.h"
#include "ddbridge-io.h"
/****************************************************************************/
/* module parameters */
#ifdef CONFIG_PCI_MSI
#ifdef CONFIG_DVB_DDBRIDGE_MSIENABLE
static int msi = 1;
#else
static int msi;
#endif
module_param(msi, int, 0444);
#ifdef CONFIG_DVB_DDBRIDGE_MSIENABLE
MODULE_PARM_DESC(msi, "Control MSI interrupts: 0-disable, 1-enable (default)");
#else
MODULE_PARM_DESC(msi, "Control MSI interrupts: 0-disable (default), 1-enable");
#endif
#endif
/****************************************************************************/
/****************************************************************************/
/****************************************************************************/
static void ddb_irq_disable(struct ddb *dev)
{
ddbwritel(dev, 0, INTERRUPT_ENABLE);
ddbwritel(dev, 0, MSI1_ENABLE);
}
static void ddb_msi_exit(struct ddb *dev)
{
#ifdef CONFIG_PCI_MSI
if (dev->msi)
pci_free_irq_vectors(dev->pdev);
#endif
}
static void ddb_irq_exit(struct ddb *dev)
{
ddb_irq_disable(dev);
if (dev->msi == 2)
free_irq(pci_irq_vector(dev->pdev, 1), dev);
free_irq(pci_irq_vector(dev->pdev, 0), dev);
}
static void ddb_remove(struct pci_dev *pdev)
{
struct ddb *dev = (struct ddb *)pci_get_drvdata(pdev);
ddb_device_destroy(dev);
ddb_ports_detach(dev);
ddb_i2c_release(dev);
ddb_irq_exit(dev);
ddb_msi_exit(dev);
ddb_ports_release(dev);
ddb_buffers_free(dev);
ddb_unmap(dev);
pci_set_drvdata(pdev, NULL);
pci_disable_device(pdev);
}
#ifdef CONFIG_PCI_MSI
static void ddb_irq_msi(struct ddb *dev, int nr)
{
int stat;
if (msi && pci_msi_enabled()) {
stat = pci_alloc_irq_vectors(dev->pdev, 1, nr,
PCI_IRQ_MSI | PCI_IRQ_MSIX);
if (stat >= 1) {
dev->msi = stat;
dev_info(dev->dev, "using %d MSI interrupt(s)\n",
dev->msi);
} else {
dev_info(dev->dev, "MSI not available.\n");
}
}
}
#endif
static int ddb_irq_init(struct ddb *dev)
{
int stat;
int irq_flag = IRQF_SHARED;
ddbwritel(dev, 0x00000000, INTERRUPT_ENABLE);
ddbwritel(dev, 0x00000000, MSI1_ENABLE);
ddbwritel(dev, 0x00000000, MSI2_ENABLE);
ddbwritel(dev, 0x00000000, MSI3_ENABLE);
ddbwritel(dev, 0x00000000, MSI4_ENABLE);
ddbwritel(dev, 0x00000000, MSI5_ENABLE);
ddbwritel(dev, 0x00000000, MSI6_ENABLE);
ddbwritel(dev, 0x00000000, MSI7_ENABLE);
#ifdef CONFIG_PCI_MSI
ddb_irq_msi(dev, 2);
if (dev->msi)
irq_flag = 0;
if (dev->msi == 2) {
stat = request_irq(pci_irq_vector(dev->pdev, 0),
ddb_irq_handler0, irq_flag, "ddbridge",
(void *)dev);
if (stat < 0)
return stat;
stat = request_irq(pci_irq_vector(dev->pdev, 1),
ddb_irq_handler1, irq_flag, "ddbridge",
(void *)dev);
if (stat < 0) {
free_irq(pci_irq_vector(dev->pdev, 0), dev);
return stat;
}
} else
#endif
{
stat = request_irq(pci_irq_vector(dev->pdev, 0),
ddb_irq_handler, irq_flag, "ddbridge",
(void *)dev);
if (stat < 0)
return stat;
}
if (dev->msi == 2) {
ddbwritel(dev, 0x0fffff00, INTERRUPT_ENABLE);
ddbwritel(dev, 0x0000000f, MSI1_ENABLE);
} else {
ddbwritel(dev, 0x0fffff0f, INTERRUPT_ENABLE);
ddbwritel(dev, 0x00000000, MSI1_ENABLE);
}
return stat;
}
static int ddb_probe(struct pci_dev *pdev,
const struct pci_device_id *id)
{
struct ddb *dev;
int stat = 0;
if (pci_enable_device(pdev) < 0)
return -ENODEV;
pci_set_master(pdev);
if (dma_set_mask(&pdev->dev, DMA_BIT_MASK(64)))
if (dma_set_mask(&pdev->dev, DMA_BIT_MASK(32)))
return -ENODEV;
dev = vzalloc(sizeof(*dev));
if (!dev)
return -ENOMEM;
mutex_init(&dev->mutex);
dev->has_dma = 1;
dev->pdev = pdev;
dev->dev = &pdev->dev;
pci_set_drvdata(pdev, dev);
dev->link[0].ids.vendor = id->vendor;
dev->link[0].ids.device = id->device;
dev->link[0].ids.subvendor = id->subvendor;
dev->link[0].ids.subdevice = pdev->subsystem_device;
dev->link[0].ids.devid = (id->device << 16) | id->vendor;
dev->link[0].dev = dev;
dev->link[0].info = get_ddb_info(id->vendor, id->device,
id->subvendor, pdev->subsystem_device);
dev_info(&pdev->dev, "detected %s\n", dev->link[0].info->name);
dev->regs_len = pci_resource_len(dev->pdev, 0);
dev->regs = ioremap(pci_resource_start(dev->pdev, 0),
pci_resource_len(dev->pdev, 0));
if (!dev->regs) {
dev_err(&pdev->dev, "not enough memory for register map\n");
stat = -ENOMEM;
goto fail;
}
if (ddbreadl(dev, 0) == 0xffffffff) {
dev_err(&pdev->dev, "cannot read registers\n");
stat = -ENODEV;
goto fail;
}
dev->link[0].ids.hwid = ddbreadl(dev, 0);
dev->link[0].ids.regmapid = ddbreadl(dev, 4);
dev_info(&pdev->dev, "HW %08x REGMAP %08x\n",
dev->link[0].ids.hwid, dev->link[0].ids.regmapid);
ddbwritel(dev, 0, DMA_BASE_READ);
ddbwritel(dev, 0, DMA_BASE_WRITE);
stat = ddb_irq_init(dev);
if (stat < 0)
goto fail0;
if (ddb_init(dev) == 0)
return 0;
ddb_irq_exit(dev);
fail0:
dev_err(&pdev->dev, "fail0\n");
ddb_msi_exit(dev);
fail:
dev_err(&pdev->dev, "fail\n");
ddb_unmap(dev);
pci_set_drvdata(pdev, NULL);
pci_disable_device(pdev);
return stat;
}
/****************************************************************************/
/****************************************************************************/
/****************************************************************************/
#define DDB_DEVICE_ANY(_device) \
{ PCI_DEVICE_SUB(DDVID, _device, DDVID, PCI_ANY_ID) }
static const struct pci_device_id ddb_id_table[] = {
DDB_DEVICE_ANY(0x0002),
DDB_DEVICE_ANY(0x0003),
DDB_DEVICE_ANY(0x0005),
DDB_DEVICE_ANY(0x0006),
DDB_DEVICE_ANY(0x0007),
DDB_DEVICE_ANY(0x0008),
DDB_DEVICE_ANY(0x0009),
DDB_DEVICE_ANY(0x0011),
DDB_DEVICE_ANY(0x0012),
DDB_DEVICE_ANY(0x0013),
DDB_DEVICE_ANY(0x0201),
DDB_DEVICE_ANY(0x0203),
DDB_DEVICE_ANY(0x0210),
DDB_DEVICE_ANY(0x0220),
DDB_DEVICE_ANY(0x0320),
DDB_DEVICE_ANY(0x0321),
DDB_DEVICE_ANY(0x0322),
DDB_DEVICE_ANY(0x0323),
DDB_DEVICE_ANY(0x0328),
DDB_DEVICE_ANY(0x0329),
{0}
};
MODULE_DEVICE_TABLE(pci, ddb_id_table);
static struct pci_driver ddb_pci_driver = {
.name = "ddbridge",
.id_table = ddb_id_table,
.probe = ddb_probe,
.remove = ddb_remove,
};
static __init int module_init_ddbridge(void)
{
int stat;
pr_info("Digital Devices PCIE bridge driver "
DDBRIDGE_VERSION
", Copyright (C) 2010-17 Digital Devices GmbH\n");
stat = ddb_init_ddbridge();
if (stat < 0)
return stat;
stat = pci_register_driver(&ddb_pci_driver);
if (stat < 0)
ddb_exit_ddbridge(0, stat);
return stat;
}
static __exit void module_exit_ddbridge(void)
{
pci_unregister_driver(&ddb_pci_driver);
ddb_exit_ddbridge(0, 0);
}
module_init(module_init_ddbridge);
module_exit(module_exit_ddbridge);
MODULE_DESCRIPTION("Digital Devices PCIe Bridge");
MODULE_AUTHOR("Ralph and Marcus Metzler, Metzler Brothers Systementwicklung GbR");
MODULE_LICENSE("GPL v2");
MODULE_VERSION(DDBRIDGE_VERSION);
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