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         } 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
 161 static 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
 206 static 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
 290 static 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
 303 static 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
 322 module_init(hp300_8250_init);
 323 module_exit(hp300_8250_exit);
 324 MODULE_DESCRIPTION("HP DCA/APCI serial driver");
 325 MODULE_AUTHOR("Kars de Jong <jongk@linux-m68k.org>");
 326 MODULE_LICENSE("GPL");