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

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * 8250_moxa.c - MOXA Smartio/Industio MUE multiport serial driver.
   4  *
   5  * Author: Mathieu OTHACEHE <m.othacehe@gmail.com>
   6  */
   7
   8 #include <linux/module.h>
   9 #include <linux/pci.h>
  10
  11 #include "8250.h"
  12
  13 #define PCI_DEVICE_ID_MOXA_CP102E       0x1024
  14 #define PCI_DEVICE_ID_MOXA_CP102EL      0x1025
  15 #define PCI_DEVICE_ID_MOXA_CP104EL_A    0x1045
  16 #define PCI_DEVICE_ID_MOXA_CP114EL      0x1144
  17 #define PCI_DEVICE_ID_MOXA_CP116E_A_A   0x1160
  18 #define PCI_DEVICE_ID_MOXA_CP116E_A_B   0x1161
  19 #define PCI_DEVICE_ID_MOXA_CP118EL_A    0x1182
  20 #define PCI_DEVICE_ID_MOXA_CP118E_A_I   0x1183
  21 #define PCI_DEVICE_ID_MOXA_CP132EL      0x1322
  22 #define PCI_DEVICE_ID_MOXA_CP134EL_A    0x1342
  23 #define PCI_DEVICE_ID_MOXA_CP138E_A     0x1381
  24 #define PCI_DEVICE_ID_MOXA_CP168EL_A    0x1683
  25
  26 #define MOXA_BASE_BAUD 921600
  27 #define MOXA_UART_OFFSET 0x200
  28 #define MOXA_BASE_BAR 1
  29
  30 struct moxa8250_board {
  31         unsigned int num_ports;
  32         int line[0];
  33 };
  34
  35 enum {
  36         moxa8250_2p = 0,
  37         moxa8250_4p,
  38         moxa8250_8p
  39 };
  40
  41 static struct moxa8250_board moxa8250_boards[] = {
  42         [moxa8250_2p] = { .num_ports = 2},
  43         [moxa8250_4p] = { .num_ports = 4},
  44         [moxa8250_8p] = { .num_ports = 8},
  45 };
  46
  47 static int moxa8250_probe(struct pci_dev *pdev, const struct pci_device_id *id)
  48 {
  49         struct uart_8250_port uart;
  50         struct moxa8250_board *brd;
  51         void __iomem *ioaddr;
  52         resource_size_t baseaddr;
  53         unsigned int i, nr_ports;
  54         unsigned int offset;
  55         int ret;
  56
  57         brd = &moxa8250_boards[id->driver_data];
  58         nr_ports = brd->num_ports;
  59
  60         ret = pcim_enable_device(pdev);
  61         if (ret)
  62                 return ret;
  63
  64         brd = devm_kzalloc(&pdev->dev, sizeof(struct moxa8250_board) +
  65                            sizeof(unsigned int) * nr_ports, GFP_KERNEL);
  66         if (!brd)
  67                 return -ENOMEM;
  68         brd->num_ports = nr_ports;
  69
  70         memset(&uart, 0, sizeof(struct uart_8250_port));
  71
  72         uart.port.dev = &pdev->dev;
  73         uart.port.irq = pdev->irq;
  74         uart.port.uartclk = MOXA_BASE_BAUD * 16;
  75         uart.port.flags = UPF_SKIP_TEST | UPF_BOOT_AUTOCONF | UPF_SHARE_IRQ;
  76
  77         baseaddr = pci_resource_start(pdev, MOXA_BASE_BAR);
  78         ioaddr = pcim_iomap(pdev, MOXA_BASE_BAR, 0);
  79         if (!ioaddr)
  80                 return -ENOMEM;
  81
  82         for (i = 0; i < nr_ports; i++) {
  83
  84                 /*
  85                  * MOXA Smartio MUE boards with 4 ports have
  86                  * a different offset for port #3
  87                  */
  88                 if (nr_ports == 4 && i == 3)
  89                         offset = 7 * MOXA_UART_OFFSET;
  90                 else
  91                         offset = i * MOXA_UART_OFFSET;
  92
  93                 uart.port.iotype = UPIO_MEM;
  94                 uart.port.iobase = 0;
  95                 uart.port.mapbase = baseaddr + offset;
  96                 uart.port.membase = ioaddr + offset;
  97                 uart.port.regshift = 0;
  98
  99                 dev_dbg(&pdev->dev, "Setup PCI port: port %lx, irq %d, type %d\n",
 100                         uart.port.iobase, uart.port.irq, uart.port.iotype);
 101
 102                 brd->line[i] = serial8250_register_8250_port(&uart);
 103                 if (brd->line[i] < 0) {
 104                         dev_err(&pdev->dev,
 105                                 "Couldn't register serial port %lx, irq %d, type %d, error %d\n",
 106                                 uart.port.iobase, uart.port.irq,
 107                                 uart.port.iotype, brd->line[i]);
 108                         break;
 109                 }
 110         }
 111
 112         pci_set_drvdata(pdev, brd);
 113         return 0;
 114 }
 115
 116 static void moxa8250_remove(struct pci_dev *pdev)
 117 {
 118         struct moxa8250_board *brd = pci_get_drvdata(pdev);
 119         unsigned int i;
 120
 121         for (i = 0; i < brd->num_ports; i++)
 122                 serial8250_unregister_port(brd->line[i]);
 123 }
 124
 125 #define MOXA_DEVICE(id, data) { PCI_VDEVICE(MOXA, id), (kernel_ulong_t)data }
 126
 127 static const struct pci_device_id pci_ids[] = {
 128         MOXA_DEVICE(PCI_DEVICE_ID_MOXA_CP102E, moxa8250_2p),
 129         MOXA_DEVICE(PCI_DEVICE_ID_MOXA_CP102EL, moxa8250_2p),
 130         MOXA_DEVICE(PCI_DEVICE_ID_MOXA_CP104EL_A, moxa8250_4p),
 131         MOXA_DEVICE(PCI_DEVICE_ID_MOXA_CP114EL, moxa8250_4p),
 132         MOXA_DEVICE(PCI_DEVICE_ID_MOXA_CP116E_A_A, moxa8250_8p),
 133         MOXA_DEVICE(PCI_DEVICE_ID_MOXA_CP116E_A_B, moxa8250_8p),
 134         MOXA_DEVICE(PCI_DEVICE_ID_MOXA_CP118EL_A, moxa8250_8p),
 135         MOXA_DEVICE(PCI_DEVICE_ID_MOXA_CP118E_A_I, moxa8250_8p),
 136         MOXA_DEVICE(PCI_DEVICE_ID_MOXA_CP132EL, moxa8250_2p),
 137         MOXA_DEVICE(PCI_DEVICE_ID_MOXA_CP134EL_A, moxa8250_4p),
 138         MOXA_DEVICE(PCI_DEVICE_ID_MOXA_CP138E_A, moxa8250_8p),
 139         MOXA_DEVICE(PCI_DEVICE_ID_MOXA_CP168EL_A, moxa8250_8p),
 140         {0}
 141 };
 142 MODULE_DEVICE_TABLE(pci, pci_ids);
 143
 144 static struct pci_driver moxa8250_pci_driver = {
 145         .name           = "8250_moxa",
 146         .id_table       = pci_ids,
 147         .probe          = moxa8250_probe,
 148         .remove         = moxa8250_remove,
 149 };
 150
 151 module_pci_driver(moxa8250_pci_driver);
 152
 153 MODULE_AUTHOR("Mathieu OTHACEHE");
 154 MODULE_DESCRIPTION("MOXA SmartIO MUE driver");
 155 MODULE_LICENSE("GPL v2");