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