1// SPDX-License-Identifier: GPL-2.0-or-later
  2/*
  3	Mantis PCI bridge driver
  4
  5	Copyright (C) Manu Abraham (abraham.manu@gmail.com)
  6
  7*/
  8
  9#include <linux/module.h>
 10#include <linux/moduleparam.h>
 11#include <linux/kernel.h>
 12#include <asm/io.h>
 13#include <asm/page.h>
 14#include <linux/kmod.h>
 15#include <linux/vmalloc.h>
 16#include <linux/init.h>
 17#include <linux/device.h>
 18#include <linux/pci.h>
 19
 20#include <asm/irq.h>
 21#include <linux/signal.h>
 22#include <linux/sched.h>
 23#include <linux/interrupt.h>
 24
 25#include <media/dmxdev.h>
 26#include <media/dvbdev.h>
 27#include <media/dvb_demux.h>
 28#include <media/dvb_frontend.h>
 29#include <media/dvb_net.h>
 30
 31#include "mantis_common.h"
 32#include "mantis_reg.h"
 33#include "mantis_pci.h"
 34
 35#define DRIVER_NAME		"Mantis Core"
 36
 37int mantis_pci_init(struct mantis_pci *mantis)
 38{
 39	u8 latency;
 40	struct mantis_hwconfig *config	= mantis->hwconfig;
 41	struct pci_dev *pdev		= mantis->pdev;
 42	int err, ret = 0;
 43
 44	dprintk(MANTIS_ERROR, 0, "found a %s PCI %s device on (%02x:%02x.%x),\n",
 45		config->model_name,
 46		config->dev_type,
 47		mantis->pdev->bus->number,
 48		PCI_SLOT(mantis->pdev->devfn),
 49		PCI_FUNC(mantis->pdev->devfn));
 50
 51	err = pci_enable_device(pdev);
 52	if (err != 0) {
 53		ret = -ENODEV;
 54		dprintk(MANTIS_ERROR, 1, "ERROR: PCI enable failed <%i>", err);
 55		goto fail0;
 56	}
 57
 58	err = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
 59	if (err != 0) {
 60		dprintk(MANTIS_ERROR, 1, "ERROR: Unable to obtain 32 bit DMA <%i>", err);
 61		ret = -ENOMEM;
 62		goto fail1;
 63	}
 64
 65	pci_set_master(pdev);
 66
 67	if (!request_mem_region(pci_resource_start(pdev, 0),
 68				pci_resource_len(pdev, 0),
 69				DRIVER_NAME)) {
 70
 71		dprintk(MANTIS_ERROR, 1, "ERROR: BAR0 Request failed !");
 72		ret = -ENODEV;
 73		goto fail1;
 74	}
 75
 76	mantis->mmio = ioremap(pci_resource_start(pdev, 0),
 77			       pci_resource_len(pdev, 0));
 78
 79	if (!mantis->mmio) {
 80		dprintk(MANTIS_ERROR, 1, "ERROR: BAR0 remap failed !");
 81		ret = -ENODEV;
 82		goto fail2;
 83	}
 84
 85	pci_read_config_byte(pdev, PCI_LATENCY_TIMER, &latency);
 86	mantis->latency = latency;
 87	mantis->revision = pdev->revision;
 88
 89	dprintk(MANTIS_ERROR, 0, "    Mantis Rev %d [%04x:%04x], ",
 90		mantis->revision,
 91		mantis->pdev->subsystem_vendor,
 92		mantis->pdev->subsystem_device);
 93
 94	dprintk(MANTIS_ERROR, 0,
 95		"irq: %d, latency: %d\n    memory: 0x%lx, mmio: 0x%p\n",
 96		mantis->pdev->irq,
 97		mantis->latency,
 98		mantis->mantis_addr,
 99		mantis->mmio);
100
101	err = request_irq(pdev->irq,
102			  config->irq_handler,
103			  IRQF_SHARED,
104			  DRIVER_NAME,
105			  mantis);
106
107	if (err != 0) {
108
109		dprintk(MANTIS_ERROR, 1, "ERROR: IRQ registration failed ! <%d>", err);
110		ret = -ENODEV;
111		goto fail3;
112	}
113
114	pci_set_drvdata(pdev, mantis);
115	return ret;
116
117	/* Error conditions */
118fail3:
119	dprintk(MANTIS_ERROR, 1, "ERROR: <%d> I/O unmap", ret);
120	if (mantis->mmio)
121		iounmap(mantis->mmio);
122
123fail2:
124	dprintk(MANTIS_ERROR, 1, "ERROR: <%d> releasing regions", ret);
125	release_mem_region(pci_resource_start(pdev, 0),
126			   pci_resource_len(pdev, 0));
127
128fail1:
129	dprintk(MANTIS_ERROR, 1, "ERROR: <%d> disabling device", ret);
130	pci_disable_device(pdev);
131
132fail0:
133	dprintk(MANTIS_ERROR, 1, "ERROR: <%d> exiting", ret);
134	return ret;
135}
136EXPORT_SYMBOL_GPL(mantis_pci_init);
137
138void mantis_pci_exit(struct mantis_pci *mantis)
139{
140	struct pci_dev *pdev = mantis->pdev;
141
142	dprintk(MANTIS_NOTICE, 1, " mem: 0x%p", mantis->mmio);
143	free_irq(pdev->irq, mantis);
144	if (mantis->mmio) {
145		iounmap(mantis->mmio);
146		release_mem_region(pci_resource_start(pdev, 0),
147				   pci_resource_len(pdev, 0));
148	}
149
150	pci_disable_device(pdev);
151}
152EXPORT_SYMBOL_GPL(mantis_pci_exit);
153
154MODULE_DESCRIPTION("Mantis PCI DTV bridge driver");
155MODULE_AUTHOR("Manu Abraham");
156MODULE_LICENSE("GPL");