drivers/tty/serial/8250/8250_moxa.c

   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
  33 struct moxa8250_board {
  34         unsigned int num_ports;
  35         int line[0];
  36 };
  37
  38 enum {
  39         moxa8250_2p = 0,
  40         moxa8250_4p,
  41         moxa8250_8p
  42 };
  43
  44 static 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
  50 static 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
 118 static 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
 129 static 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 };
 144 MODULE_DEVICE_TABLE(pci, pci_ids);
 145
 146 static 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
 153 module_pci_driver(moxa8250_pci_driver);
 154
 155 MODULE_AUTHOR("Mathieu OTHACEHE");
 156 MODULE_DESCRIPTION("MOXA SmartIO MUE driver");
 157 MODULE_LICENSE("GPL v2");