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 <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
  27 struct hp300_port
  28 {
  29         struct hp300_port *next;        /* next port */
  30         int line;                       /* line (tty) number */
  31 };
  32
  33 static struct hp300_port *hp300_ports;
  34 #endif
  35
  36 #ifdef CONFIG_HPDCA
  37
  38 static int __devinit hpdca_init_one(struct dio_dev *d,
  39                                 const struct dio_device_id *ent);
  40 static void __devexit hpdca_remove_one(struct dio_dev *d);
  41
  42 static 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
  50 static 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
  59 static unsigned int num_ports;
  60
  61 extern 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  */
  95 int __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         }
 130         else {
 131 #ifdef CONFIG_HPDCA
 132                 unsigned long pa = dio_scodetophysaddr(scode);
 133                 if (!pa) {
 134                         return 0;
 135                 }
 136
 137                 printk(KERN_INFO "Serial console is HP DCA at select code %d\n", scode);
 138
 139                 port.uartclk = HPDCA_BAUD_BASE * 16;
 140                 port.mapbase = (pa + UART_OFFSET);
 141                 port.membase = (char *)(port.mapbase + DIO_VIRADDRBASE);
 142                 port.regshift = 1;
 143                 port.irq = DIO_IPL(pa + DIO_VIRADDRBASE);
 144
 145                 /* Enable board-interrupts */
 146                 out_8(pa + DIO_VIRADDRBASE + DCA_IC, DCA_IC_IE);
 147
 148                 if (DIO_ID(pa + DIO_VIRADDRBASE) & 0x80) {
 149                         add_preferred_console("ttyS", port.line, "9600n8");
 150                 }
 151 #else
 152                 printk(KERN_WARNING "Serial console is DCA but support is disabled (CONFIG_HPDCA)!\n");
 153                 return 0;
 154 #endif
 155         }
 156
 157         if (early_serial_setup(&port) < 0) {
 158                 printk(KERN_WARNING "hp300_setup_serial_console(): early_serial_setup() failed.\n");
 159         }
 160
 161         return 0;
 162 }
 163 #endif /* CONFIG_SERIAL_8250_CONSOLE */
 164
 165 #ifdef CONFIG_HPDCA
 166 static int __devinit hpdca_init_one(struct dio_dev *d,
 167                                 const struct dio_device_id *ent)
 168 {
 169         struct uart_port port;
 170         int line;
 171
 172 #ifdef CONFIG_SERIAL_8250_CONSOLE
 173         if (hp300_uart_scode == d->scode) {
 174                 /* Already got it. */
 175                 return 0;
 176         }
 177 #endif
 178         memset(&port, 0, sizeof(struct uart_port));
 179
 180         /* Memory mapped I/O */
 181         port.iotype = UPIO_MEM;
 182         port.flags = UPF_SKIP_TEST | UPF_SHARE_IRQ | UPF_BOOT_AUTOCONF;
 183         port.irq = d->ipl;
 184         port.uartclk = HPDCA_BAUD_BASE * 16;
 185         port.mapbase = (d->resource.start + UART_OFFSET);
 186         port.membase = (char *)(port.mapbase + DIO_VIRADDRBASE);
 187         port.regshift = 1;
 188         port.dev = &d->dev;
 189         line = serial8250_register_port(&port);
 190
 191         if (line < 0) {
 192                 printk(KERN_NOTICE "8250_hp300: register_serial() DCA scode %d"
 193                        " irq %d failed\n", d->scode, port.irq);
 194                 return -ENOMEM;
 195         }
 196
 197         /* Enable board-interrupts */
 198         out_8(d->resource.start + DIO_VIRADDRBASE + DCA_IC, DCA_IC_IE);
 199         dio_set_drvdata(d, (void *)line);
 200
 201         /* Reset the DCA */
 202         out_8(d->resource.start + DIO_VIRADDRBASE + DCA_ID, 0xff);
 203         udelay(100);
 204
 205         num_ports++;
 206
 207         return 0;
 208 }
 209 #endif
 210
 211 static int __init hp300_8250_init(void)
 212 {
 213         static int called = 0;
 214 #ifdef CONFIG_HPAPCI
 215         int line;
 216         unsigned long base;
 217         struct uart_port uport;
 218         struct hp300_port *port;
 219         int i;
 220 #endif
 221         if (called)
 222                 return -ENODEV;
 223         called = 1;
 224
 225         if (!MACH_IS_HP300)
 226                 return -ENODEV;
 227
 228 #ifdef CONFIG_HPDCA
 229         dio_register_driver(&hpdca_driver);
 230 #endif
 231 #ifdef CONFIG_HPAPCI
 232         if (hp300_model < HP_400) {
 233                 if (!num_ports)
 234                         return -ENODEV;
 235                 return 0;
 236         }
 237         /* These models have the Frodo chip.
 238          * Port 0 is reserved for the Apollo Domain keyboard.
 239          * Port 1 is either the console or the DCA.
 240          */
 241         for (i = 1; i < 4; i++) {
 242                 /* Port 1 is the console on a 425e, on other machines it's mapped to
 243                  * DCA.
 244                  */
 245 #ifdef CONFIG_SERIAL_8250_CONSOLE
 246                 if (i == 1) {
 247                         continue;
 248                 }
 249 #endif
 250
 251                 /* Create new serial device */
 252                 port = kmalloc(sizeof(struct hp300_port), GFP_KERNEL);
 253                 if (!port)
 254                         return -ENOMEM;
 255
 256                 memset(&uport, 0, sizeof(struct uart_port));
 257
 258                 base = (FRODO_BASE + FRODO_APCI_OFFSET(i));
 259
 260                 /* Memory mapped I/O */
 261                 uport.iotype = UPIO_MEM;
 262                 uport.flags = UPF_SKIP_TEST | UPF_SHARE_IRQ | UPF_BOOT_AUTOCONF;
 263                 /* XXX - no interrupt support yet */
 264                 uport.irq = 0;
 265                 uport.uartclk = HPAPCI_BAUD_BASE * 16;
 266                 uport.mapbase = base;
 267                 uport.membase = (char *)(base + DIO_VIRADDRBASE);
 268                 uport.regshift = 2;
 269
 270                 line = serial8250_register_port(&uport);
 271
 272                 if (line < 0) {
 273                         printk(KERN_NOTICE "8250_hp300: register_serial() APCI %d"
 274                                " irq %d failed\n", i, uport.irq);
 275                         kfree(port);
 276                         continue;
 277                 }
 278
 279                 port->line = line;
 280                 port->next = hp300_ports;
 281                 hp300_ports = port;
 282
 283                 num_ports++;
 284         }
 285 #endif
 286
 287         /* Any boards found? */
 288         if (!num_ports)
 289                 return -ENODEV;
 290
 291         return 0;
 292 }
 293
 294 #ifdef CONFIG_HPDCA
 295 static void __devexit hpdca_remove_one(struct dio_dev *d)
 296 {
 297         int line;
 298
 299         line = (int) dio_get_drvdata(d);
 300         if (d->resource.start) {
 301                 /* Disable board-interrupts */
 302                 out_8(d->resource.start + DIO_VIRADDRBASE + DCA_IC, 0);
 303         }
 304         serial8250_unregister_port(line);
 305 }
 306 #endif
 307
 308 static void __exit hp300_8250_exit(void)
 309 {
 310 #ifdef CONFIG_HPAPCI
 311         struct hp300_port *port, *to_free;
 312
 313         for (port = hp300_ports; port; ) {
 314                 serial8250_unregister_port(port->line);
 315                 to_free = port;
 316                 port = port->next;
 317                 kfree(to_free);
 318         }
 319
 320         hp300_ports = NULL;
 321 #endif
 322 #ifdef CONFIG_HPDCA
 323         dio_unregister_driver(&hpdca_driver);
 324 #endif
 325 }
 326
 327 module_init(hp300_8250_init);
 328 module_exit(hp300_8250_exit);
 329 MODULE_DESCRIPTION("HP DCA/APCI serial driver");
 330 MODULE_AUTHOR("Kars de Jong <jongk@linux-m68k.org>");
 331 MODULE_LICENSE("GPL");