drivers/serial/8250_hp300.c

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