LXR linux/drivers/serial/8250

   1/*
   2 * Driver for the 98626/98644/internal serial interface on hp300/hp400
   3 * (based on the National Semiconductor INS8250/NS16550AF/WD16C552 UARTs)
   4 *
   5 * Ported from 2.2 and modified to use the normal 8250 driver
   6 * by Kars de Jong <jongk@linux-m68k.org>, May 2004.
   7 */
   8#include <linux/module.h>
   9#include <linux/init.h>
  10#include <linux/string.h>
  11#include <linux/kernel.h>
  12#include <linux/serial.h>
  13#include <linux/serial_core.h>
  14#include <linux/serial_8250.h>
  15#include <linux/delay.h>
  16#include <linux/dio.h>
  17#include <linux/console.h>
  18#include <asm/io.h>
  19
  20#include "8250.h"
  21
  22#if !defined(CONFIG_HPDCA) && !defined(CONFIG_HPAPCI)
  23#warning CONFIG_8250 defined but neither CONFIG_HPDCA nor CONFIG_HPAPCI defined, are you sure?
  24#endif
  25
  26#ifdef CONFIG_HPAPCI
  27struct hp300_port
  28{
  29        struct hp300_port *next;        /* next port */
  30        int line;                       /* line (tty) number */
  31};
  32
  33static struct hp300_port *hp300_ports;
  34#endif
  35
  36#ifdef CONFIG_HPDCA
  37
  38static int __devinit hpdca_init_one(struct dio_dev *d,
  39                                        const struct dio_device_id *ent);
  40static void __devexit hpdca_remove_one(struct dio_dev *d);
  41
  42static struct dio_device_id hpdca_dio_tbl[] = {
  43        { DIO_ID_DCA0 },
  44        { DIO_ID_DCA0REM },
  45        { DIO_ID_DCA1 },
  46        { DIO_ID_DCA1REM },
  47        { 0 }
  48};
  49
  50static struct dio_driver hpdca_driver = {
  51        .name      = "hpdca",
  52        .id_table  = hpdca_dio_tbl,
  53        .probe     = hpdca_init_one,
  54        .remove    = __devexit_p(hpdca_remove_one),
  55};
  56
  57#endif
  58
  59static unsigned int num_ports;
  60
  61extern int hp300_uart_scode;
  62
  63/* Offset to UART registers from base of DCA */
  64#define UART_OFFSET     17
  65
  66#define DCA_ID          0x01    /* ID (read), reset (write) */
  67#define DCA_IC          0x03    /* Interrupt control        */
  68
  69/* Interrupt control */
  70#define DCA_IC_IE       0x80    /* Master interrupt enable  */
  71
  72#define HPDCA_BAUD_BASE 153600
  73
  74/* Base address of the Frodo part */
  75#define FRODO_BASE      (0x41c000)
  76
  77/*
  78 * Where we find the 8250-like APCI ports, and how far apart they are.
  79 */
  80#define FRODO_APCIBASE          0x0
  81#define FRODO_APCISPACE         0x20
  82#define FRODO_APCI_OFFSET(x)    (FRODO_APCIBASE + ((x) * FRODO_APCISPACE))
  83
  84#define HPAPCI_BAUD_BASE 500400
  85
  86#ifdef CONFIG_SERIAL_8250_CONSOLE
  87/*
  88 * Parse the bootinfo to find descriptions for headless console and
  89 * debug serial ports and register them with the 8250 driver.
  90 * This function should be called before serial_console_init() is called
  91 * to make sure the serial console will be available for use. IA-64 kernel
  92 * calls this function from setup_arch() after the EFI and ACPI tables have
  93 * been parsed.
  94 */
  95int __init hp300_setup_serial_console(void)
  96{
  97        int scode;
  98        struct uart_port port;
  99
 100        memset(&port, 0, sizeof(port));
 101
 102        if (hp300_uart_scode < 0 || hp300_uart_scode > DIO_SCMAX)
 103                return 0;
 104
 105        if (DIO_SCINHOLE(hp300_uart_scode))
 106                return 0;
 107
 108        scode = hp300_uart_scode;
 109
 110        /* Memory mapped I/O */
 111        port.iotype = UPIO_MEM;
 112        port.flags = UPF_SKIP_TEST | UPF_SHARE_IRQ | UPF_BOOT_AUTOCONF;
 113        port.type = PORT_UNKNOWN;
 114
 115        /* Check for APCI console */
 116        if (scode == 256) {
 117#ifdef CONFIG_HPAPCI
 118                printk(KERN_INFO "Serial console is HP APCI 1\n");
 119
 120                port.uartclk = HPAPCI_BAUD_BASE * 16;
 121                port.mapbase = (FRODO_BASE + FRODO_APCI_OFFSET(1));
 122                port.membase = (char *)(port.mapbase + DIO_VIRADDRBASE);
 123                port.regshift = 2;
 124                add_preferred_console("ttyS", port.line, "9600n8");
 125#else
 126                printk(KERN_WARNING "Serial console is APCI but support is disabled (CONFIG_HPAPCI)!\n");
 127                return 0;
 128#endif
 129        } else {
 130#ifdef CONFIG_HPDCA
 131                unsigned long pa = dio_scodetophysaddr(scode);
 132                if (!pa)
 133                        return 0;
 134
 135                printk(KERN_INFO "Serial console is HP DCA at select code %d\n", scode);
 136
 137                port.uartclk = HPDCA_BAUD_BASE * 16;
 138                port.mapbase = (pa + UART_OFFSET);
 139                port.membase = (char *)(port.mapbase + DIO_VIRADDRBASE);
 140                port.regshift = 1;
 141                port.irq = DIO_IPL(pa + DIO_VIRADDRBASE);
 142
 143                /* Enable board-interrupts */
 144                out_8(pa + DIO_VIRADDRBASE + DCA_IC, DCA_IC_IE);
 145
 146                if (DIO_ID(pa + DIO_VIRADDRBASE) & 0x80)
 147                        add_preferred_console("ttyS", port.line, "9600n8");
 148#else
 149                printk(KERN_WARNING "Serial console is DCA but support is disabled (CONFIG_HPDCA)!\n");
 150                return 0;
 151#endif
 152        }
 153
 154        if (early_serial_setup(&port) < 0)
 155                printk(KERN_WARNING "hp300_setup_serial_console(): early_serial_setup() failed.\n");
 156        return 0;
 157}
 158#endif /* CONFIG_SERIAL_8250_CONSOLE */
 159
 160#ifdef CONFIG_HPDCA
 161static int __devinit hpdca_init_one(struct dio_dev *d,
 162                                const struct dio_device_id *ent)
 163{
 164        struct uart_port port;
 165        int line;
 166
 167#ifdef CONFIG_SERIAL_8250_CONSOLE
 168        if (hp300_uart_scode == d->scode) {
 169                /* Already got it. */
 170                return 0;
 171        }
 172#endif
 173        memset(&port, 0, sizeof(struct uart_port));
 174
 175        /* Memory mapped I/O */
 176        port.iotype = UPIO_MEM;
 177        port.flags = UPF_SKIP_TEST | UPF_SHARE_IRQ | UPF_BOOT_AUTOCONF;
 178        port.irq = d->ipl;
 179        port.uartclk = HPDCA_BAUD_BASE * 16;
 180        port.mapbase = (d->resource.start + UART_OFFSET);
 181        port.membase = (char *)(port.mapbase + DIO_VIRADDRBASE);
 182        port.regshift = 1;
 183        port.dev = &d->dev;
 184        line = serial8250_register_port(&port);
 185
 186        if (line < 0) {
 187                printk(KERN_NOTICE "8250_hp300: register_serial() DCA scode %d"
 188                       " irq %d failed\n", d->scode, port.irq);
 189                return -ENOMEM;
 190        }
 191
 192        /* Enable board-interrupts */
 193        out_8(d->resource.start + DIO_VIRADDRBASE + DCA_IC, DCA_IC_IE);
 194        dio_set_drvdata(d, (void *)line);
 195
 196        /* Reset the DCA */
 197        out_8(d->resource.start + DIO_VIRADDRBASE + DCA_ID, 0xff);
 198        udelay(100);
 199
 200        num_ports++;
 201
 202        return 0;
 203}
 204#endif
 205
 206static int __init hp300_8250_init(void)
 207{
 208        static int called;
 209#ifdef CONFIG_HPAPCI
 210        int line;
 211        unsigned long base;
 212        struct uart_port uport;
 213        struct hp300_port *port;
 214        int i;
 215#endif
 216        if (called)
 217                return -ENODEV;
 218        called = 1;
 219
 220        if (!MACH_IS_HP300)
 221                return -ENODEV;
 222
 223#ifdef CONFIG_HPDCA
 224        dio_register_driver(&hpdca_driver);
 225#endif
 226#ifdef CONFIG_HPAPCI
 227        if (hp300_model < HP_400) {
 228                if (!num_ports)
 229                        return -ENODEV;
 230                return 0;
 231        }
 232        /* These models have the Frodo chip.
 233         * Port 0 is reserved for the Apollo Domain keyboard.
 234         * Port 1 is either the console or the DCA.
 235         */
 236        for (i = 1; i < 4; i++) {
 237                /* Port 1 is the console on a 425e, on other machines it's
 238                 * mapped to DCA.
 239                 */
 240#ifdef CONFIG_SERIAL_8250_CONSOLE
 241                if (i == 1)
 242                        continue;
 243#endif
 244
 245                /* Create new serial device */
 246                port = kmalloc(sizeof(struct hp300_port), GFP_KERNEL);
 247                if (!port)
 248                        return -ENOMEM;
 249
 250                memset(&uport, 0, sizeof(struct uart_port));
 251
 252                base = (FRODO_BASE + FRODO_APCI_OFFSET(i));
 253
 254                /* Memory mapped I/O */
 255                uport.iotype = UPIO_MEM;
 256                uport.flags = UPF_SKIP_TEST | UPF_SHARE_IRQ \
 257                              | UPF_BOOT_AUTOCONF;
 258                /* XXX - no interrupt support yet */
 259                uport.irq = 0;
 260                uport.uartclk = HPAPCI_BAUD_BASE * 16;
 261                uport.mapbase = base;
 262                uport.membase = (char *)(base + DIO_VIRADDRBASE);
 263                uport.regshift = 2;
 264
 265                line = serial8250_register_port(&uport);
 266
 267                if (line < 0) {
 268                        printk(KERN_NOTICE "8250_hp300: register_serial() APCI"
 269                               " %d irq %d failed\n", i, uport.irq);
 270                        kfree(port);
 271                        continue;
 272                }
 273
 274                port->line = line;
 275                port->next = hp300_ports;
 276                hp300_ports = port;
 277
 278                num_ports++;
 279        }
 280#endif
 281
 282        /* Any boards found? */
 283        if (!num_ports)
 284                return -ENODEV;
 285
 286        return 0;
 287}
 288
 289#ifdef CONFIG_HPDCA
 290static void __devexit hpdca_remove_one(struct dio_dev *d)
 291{
 292        int line;
 293
 294        line = (int) dio_get_drvdata(d);
 295        if (d->resource.start) {
 296                /* Disable board-interrupts */
 297                out_8(d->resource.start + DIO_VIRADDRBASE + DCA_IC, 0);
 298        }
 299        serial8250_unregister_port(line);
 300}
 301#endif
 302
 303static void __exit hp300_8250_exit(void)
 304{
 305#ifdef CONFIG_HPAPCI
 306        struct hp300_port *port, *to_free;
 307
 308        for (port = hp300_ports; port; ) {
 309                serial8250_unregister_port(port->line);
 310                to_free = port;
 311                port = port->next;
 312                kfree(to_free);
 313        }
 314
 315        hp300_ports = NULL;
 316#endif
 317#ifdef CONFIG_HPDCA
 318        dio_unregister_driver(&hpdca_driver);
 319#endif
 320}
 321
 322module_init(hp300_8250_init);
 323module_exit(hp300_8250_exit);
 324MODULE_DESCRIPTION("HP DCA/APCI serial driver");
 325MODULE_AUTHOR("Kars de Jong <jongk@linux-m68k.org>");
 326MODULE_LICENSE("GPL");
 327