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 
37 int 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 = pci_set_consistent_dma_mask(pdev, 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 */
118 fail3:
119 	dprintk(MANTIS_ERROR, 1, "ERROR: <%d> I/O unmap", ret);
120 	if (mantis->mmio)
121 		iounmap(mantis->mmio);
122 
123 fail2:
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 
128 fail1:
129 	dprintk(MANTIS_ERROR, 1, "ERROR: <%d> disabling device", ret);
130 	pci_disable_device(pdev);
131 
132 fail0:
133 	dprintk(MANTIS_ERROR, 1, "ERROR: <%d> exiting", ret);
134 	return ret;
135 }
136 EXPORT_SYMBOL_GPL(mantis_pci_init);
137 
138 void 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 }
152 EXPORT_SYMBOL_GPL(mantis_pci_exit);
153 
154 MODULE_DESCRIPTION("Mantis PCI DTV bridge driver");
155 MODULE_AUTHOR("Manu Abraham");
156 MODULE_LICENSE("GPL");
157