1/*
  2 * 8250_moxa.c - MOXA Smartio/Industio MUE multiport serial driver.
  3 *
  4 * Author: Mathieu OTHACEHE <m.othacehe@gmail.com>
  5 *
  6 * This program is free software; you can redistribute it and/or modify
  7 * it under the terms of the GNU General Public License version 2 as
  8 * published by the Free Software Foundation.
  9 */
 10
 11#include <linux/module.h>
 12#include <linux/pci.h>
 13
 14#include "8250.h"
 15
 16#define	PCI_DEVICE_ID_MOXA_CP102E	0x1024
 17#define	PCI_DEVICE_ID_MOXA_CP102EL	0x1025
 18#define	PCI_DEVICE_ID_MOXA_CP104EL_A	0x1045
 19#define	PCI_DEVICE_ID_MOXA_CP114EL	0x1144
 20#define	PCI_DEVICE_ID_MOXA_CP116E_A_A	0x1160
 21#define	PCI_DEVICE_ID_MOXA_CP116E_A_B	0x1161
 22#define	PCI_DEVICE_ID_MOXA_CP118EL_A	0x1182
 23#define	PCI_DEVICE_ID_MOXA_CP118E_A_I	0x1183
 24#define	PCI_DEVICE_ID_MOXA_CP132EL	0x1322
 25#define	PCI_DEVICE_ID_MOXA_CP134EL_A	0x1342
 26#define	PCI_DEVICE_ID_MOXA_CP138E_A	0x1381
 27#define	PCI_DEVICE_ID_MOXA_CP168EL_A	0x1683
 28
 29#define MOXA_BASE_BAUD 921600
 30#define MOXA_UART_OFFSET 0x200
 31#define MOXA_BASE_BAR 1
 32
 33struct moxa8250_board {
 34	unsigned int num_ports;
 35	int line[0];
 36};
 37
 38enum {
 39	moxa8250_2p = 0,
 40	moxa8250_4p,
 41	moxa8250_8p
 42};
 43
 44static struct moxa8250_board moxa8250_boards[] = {
 45	[moxa8250_2p] = { .num_ports = 2},
 46	[moxa8250_4p] = { .num_ports = 4},
 47	[moxa8250_8p] = { .num_ports = 8},
 48};
 49
 50static int moxa8250_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 51{
 52	struct uart_8250_port uart;
 53	struct moxa8250_board *brd;
 54	void __iomem *ioaddr;
 55	resource_size_t baseaddr;
 56	unsigned int i, nr_ports;
 57	unsigned int offset;
 58	int ret;
 59
 60	brd = &moxa8250_boards[id->driver_data];
 61	nr_ports = brd->num_ports;
 62
 63	ret = pcim_enable_device(pdev);
 64	if (ret)
 65		return ret;
 66
 67	brd = devm_kzalloc(&pdev->dev, sizeof(struct moxa8250_board) +
 68			   sizeof(unsigned int) * nr_ports, GFP_KERNEL);
 69	if (!brd)
 70		return -ENOMEM;
 71
 72	memset(&uart, 0, sizeof(struct uart_8250_port));
 73
 74	uart.port.dev = &pdev->dev;
 75	uart.port.irq = pdev->irq;
 76	uart.port.uartclk = MOXA_BASE_BAUD * 16;
 77	uart.port.flags = UPF_SKIP_TEST | UPF_BOOT_AUTOCONF | UPF_SHARE_IRQ;
 78
 79	baseaddr = pci_resource_start(pdev, MOXA_BASE_BAR);
 80	ioaddr = pcim_iomap(pdev, MOXA_BASE_BAR, 0);
 81	if (!ioaddr)
 82		return -ENOMEM;
 83
 84	for (i = 0; i < nr_ports; i++) {
 85
 86		/*
 87		 * MOXA Smartio MUE boards with 4 ports have
 88		 * a different offset for port #3
 89		 */
 90		if (nr_ports == 4 && i == 3)
 91			offset = 7 * MOXA_UART_OFFSET;
 92		else
 93			offset = i * MOXA_UART_OFFSET;
 94
 95		uart.port.iotype = UPIO_MEM;
 96		uart.port.iobase = 0;
 97		uart.port.mapbase = baseaddr + offset;
 98		uart.port.membase = ioaddr + offset;
 99		uart.port.regshift = 0;
100
101		dev_dbg(&pdev->dev, "Setup PCI port: port %lx, irq %d, type %d\n",
102			uart.port.iobase, uart.port.irq, uart.port.iotype);
103
104		brd->line[i] = serial8250_register_8250_port(&uart);
105		if (brd->line[i] < 0) {
106			dev_err(&pdev->dev,
107				"Couldn't register serial port %lx, irq %d, type %d, error %d\n",
108				uart.port.iobase, uart.port.irq,
109				uart.port.iotype, brd->line[i]);
110			break;
111		}
112	}
113
114	pci_set_drvdata(pdev, brd);
115	return 0;
116}
117
118static void moxa8250_remove(struct pci_dev *pdev)
119{
120	struct moxa8250_board *brd = pci_get_drvdata(pdev);
121	unsigned int i;
122
123	for (i = 0; i < brd->num_ports; i++)
124		serial8250_unregister_port(brd->line[i]);
125}
126
127#define MOXA_DEVICE(id, data) { PCI_VDEVICE(MOXA, id), (kernel_ulong_t)data }
128
129static const struct pci_device_id pci_ids[] = {
130	MOXA_DEVICE(PCI_DEVICE_ID_MOXA_CP102E, moxa8250_2p),
131	MOXA_DEVICE(PCI_DEVICE_ID_MOXA_CP102EL, moxa8250_2p),
132	MOXA_DEVICE(PCI_DEVICE_ID_MOXA_CP104EL_A, moxa8250_4p),
133	MOXA_DEVICE(PCI_DEVICE_ID_MOXA_CP114EL, moxa8250_4p),
134	MOXA_DEVICE(PCI_DEVICE_ID_MOXA_CP116E_A_A, moxa8250_8p),
135	MOXA_DEVICE(PCI_DEVICE_ID_MOXA_CP116E_A_B, moxa8250_8p),
136	MOXA_DEVICE(PCI_DEVICE_ID_MOXA_CP118EL_A, moxa8250_8p),
137	MOXA_DEVICE(PCI_DEVICE_ID_MOXA_CP118E_A_I, moxa8250_8p),
138	MOXA_DEVICE(PCI_DEVICE_ID_MOXA_CP132EL, moxa8250_2p),
139	MOXA_DEVICE(PCI_DEVICE_ID_MOXA_CP134EL_A, moxa8250_4p),
140	MOXA_DEVICE(PCI_DEVICE_ID_MOXA_CP138E_A, moxa8250_8p),
141	MOXA_DEVICE(PCI_DEVICE_ID_MOXA_CP168EL_A, moxa8250_8p),
142	{0}
143};
144MODULE_DEVICE_TABLE(pci, pci_ids);
145
146static struct pci_driver moxa8250_pci_driver = {
147	.name           = "8250_moxa",
148	.id_table       = pci_ids,
149	.probe          = moxa8250_probe,
150	.remove         = moxa8250_remove,
151};
152
153module_pci_driver(moxa8250_pci_driver);
154
155MODULE_AUTHOR("Mathieu OTHACEHE");
156MODULE_DESCRIPTION("MOXA SmartIO MUE driver");
157MODULE_LICENSE("GPL v2");