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/tty.h>
  13 #include <linux/serial.h>
  14 #include <linux/serialP.h>
  15 #include <linux/serial_core.h>
  16 #include <linux/delay.h>
  17 #include <linux/dio.h>
  18 #include <linux/console.h>
  19 #include <asm/io.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 extern int hp300_uart_scode;
  59
  60 /* Offset to UART registers from base of DCA */
  61 #define UART_OFFSET     17
  62
  63 #define DCA_ID          0x01    /* ID (read), reset (write) */
  64 #define DCA_IC          0x03    /* Interrupt control        */
  65
  66 /* Interrupt control */
  67 #define DCA_IC_IE       0x80    /* Master interrupt enable  */
  68
  69 #define HPDCA_BAUD_BASE 153600
  70
  71 /* Base address of the Frodo part */
  72 #define FRODO_BASE      (0x41c000)
  73
  74 /*
  75  * Where we find the 8250-like APCI ports, and how far apart they are.
  76  */
  77 #define FRODO_APCIBASE          0x0
  78 #define FRODO_APCISPACE         0x20
  79 #define FRODO_APCI_OFFSET(x)    (FRODO_APCIBASE + ((x) * FRODO_APCISPACE))
  80
  81 #define HPAPCI_BAUD_BASE 500400
  82
  83 #ifdef CONFIG_SERIAL_8250_CONSOLE
  84 /*
  85  * Parse the bootinfo to find descriptions for headless console and
  86  * debug serial ports and register them with the 8250 driver.
  87  * This function should be called before serial_console_init() is called
  88  * to make sure the serial console will be available for use. IA-64 kernel
  89  * calls this function from setup_arch() after the EFI and ACPI tables have
  90  * been parsed.
  91  */
  92 int __init hp300_setup_serial_console(void)
  93 {
  94         int scode;
  95         struct uart_port port;
  96
  97         memset(&port, 0, sizeof(port));
  98
  99         if (hp300_uart_scode < 0 || hp300_uart_scode > DIO_SCMAX)
 100                 return 0;
 101
 102         if (DIO_SCINHOLE(hp300_uart_scode))
 103                 return 0;
 104
 105         scode = hp300_uart_scode;
 106
 107         /* Memory mapped I/O */
 108         port.iotype = UPIO_MEM;
 109         port.flags = UPF_SKIP_TEST | UPF_SHARE_IRQ | UPF_BOOT_AUTOCONF;
 110         port.type = PORT_UNKNOWN;
 111
 112         /* Check for APCI console */
 113         if (scode == 256) {
 114 #ifdef CONFIG_HPAPCI
 115                 printk(KERN_INFO "Serial console is HP APCI 1\n");
 116
 117                 port.uartclk = HPAPCI_BAUD_BASE * 16;
 118                 port.mapbase = (FRODO_BASE + FRODO_APCI_OFFSET(1));
 119                 port.membase = (char *)(port.mapbase + DIO_VIRADDRBASE);
 120                 port.regshift = 2;
 121                 add_preferred_console("ttyS", port.line, "9600n8");
 122 #else
 123                 printk(KERN_WARNING "Serial console is APCI but support is disabled (CONFIG_HPAPCI)!\n");
 124                 return 0;
 125 #endif
 126         }
 127         else {
 128 #ifdef CONFIG_HPDCA
 129                 unsigned long pa = dio_scodetophysaddr(scode);
 130                 if (!pa) {
 131                         return 0;
 132                 }
 133
 134                 printk(KERN_INFO "Serial console is HP DCA at select code %d\n", scode);
 135
 136                 port.uartclk = HPDCA_BAUD_BASE * 16;
 137                 port.mapbase = (pa + UART_OFFSET);
 138                 port.membase = (char *)(port.mapbase + DIO_VIRADDRBASE);
 139                 port.regshift = 1;
 140                 port.irq = DIO_IPL(pa + DIO_VIRADDRBASE);
 141
 142                 /* Enable board-interrupts */
 143                 out_8(pa + DIO_VIRADDRBASE + DCA_IC, DCA_IC_IE);
 144
 145                 if (DIO_ID(pa + DIO_VIRADDRBASE) & 0x80) {
 146                         add_preferred_console("ttyS", port.line, "9600n8");
 147                 }
 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         }
 157
 158         return 0;
 159 }
 160 #endif /* CONFIG_SERIAL_8250_CONSOLE */
 161
 162 #ifdef CONFIG_HPDCA
 163 static int __devinit hpdca_init_one(struct dio_dev *d,
 164                                 const struct dio_device_id *ent)
 165 {
 166         struct serial_struct serial_req;
 167         int line;
 168
 169 #ifdef CONFIG_SERIAL_8250_CONSOLE
 170         if (hp300_uart_scode == d->scode) {
 171                 /* Already got it. */
 172                 return 0;
 173         }
 174 #endif
 175         memset(&serial_req, 0, sizeof(struct serial_struct));
 176
 177         /* Memory mapped I/O */
 178         serial_req.io_type = SERIAL_IO_MEM;
 179         serial_req.flags = UPF_SKIP_TEST | UPF_SHARE_IRQ | UPF_BOOT_AUTOCONF;
 180         serial_req.irq = d->ipl;
 181         serial_req.baud_base = HPDCA_BAUD_BASE;
 182         serial_req.iomap_base = (d->resource.start + UART_OFFSET);
 183         serial_req.iomem_base = (char *)(serial_req.iomap_base + DIO_VIRADDRBASE);
 184         serial_req.iomem_reg_shift = 1;
 185         line = register_serial(&serial_req);
 186
 187         if (line < 0) {
 188                 printk(KERN_NOTICE "8250_hp300: register_serial() DCA scode %d"
 189                        " irq %d failed\n", d->scode, serial_req.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         return 0;
 202 }
 203 #endif
 204
 205 static int __init hp300_8250_init(void)
 206 {
 207         static int called = 0;
 208         int num_ports;
 209 #ifdef CONFIG_HPAPCI
 210         int line;
 211         unsigned long base;
 212         struct serial_struct serial_req;
 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         num_ports = 0;
 224
 225 #ifdef CONFIG_HPDCA
 226         if (dio_module_init(&hpdca_driver) == 0)
 227                 num_ports++;
 228 #endif
 229 #ifdef CONFIG_HPAPCI
 230         if (hp300_model < HP_400) {
 231                 if (!num_ports)
 232                         return -ENODEV;
 233                 return 0;
 234         }
 235         /* These models have the Frodo chip.
 236          * Port 0 is reserved for the Apollo Domain keyboard.
 237          * Port 1 is either the console or the DCA.
 238          */
 239         for (i = 1; i < 4; i++) {
 240                 /* Port 1 is the console on a 425e, on other machines it's mapped to
 241                  * DCA.
 242                  */
 243 #ifdef CONFIG_SERIAL_8250_CONSOLE
 244                 if (i == 1) {
 245                         continue;
 246                 }
 247 #endif
 248
 249                 /* Create new serial device */
 250                 port = kmalloc(sizeof(struct hp300_port), GFP_KERNEL);
 251                 if (!port)
 252                         return -ENOMEM;
 253
 254                 memset(&serial_req, 0, sizeof(struct serial_struct));
 255
 256                 base = (FRODO_BASE + FRODO_APCI_OFFSET(i));
 257
 258                 /* Memory mapped I/O */
 259                 serial_req.io_type = SERIAL_IO_MEM;
 260                 serial_req.flags = UPF_SKIP_TEST | UPF_SHARE_IRQ | UPF_BOOT_AUTOCONF;
 261                 /* XXX - no interrupt support yet */
 262                 serial_req.irq = 0;
 263                 serial_req.baud_base = HPAPCI_BAUD_BASE;
 264                 serial_req.iomap_base = base;
 265                 serial_req.iomem_base = (char *)(serial_req.iomap_base + DIO_VIRADDRBASE);
 266                 serial_req.iomem_reg_shift = 2;
 267
 268                 line = register_serial(&serial_req);
 269
 270                 if (line < 0) {
 271                         printk(KERN_NOTICE "8250_hp300: register_serial() APCI %d"
 272                                " irq %d failed\n", i, serial_req.irq);
 273                         kfree(port);
 274                         continue;
 275                 }
 276
 277                 port->line = line;
 278                 port->next = hp300_ports;
 279                 hp300_ports = port;
 280
 281                 num_ports++;
 282         }
 283 #endif
 284
 285         /* Any boards found? */
 286         if (!num_ports)
 287                 return -ENODEV;
 288
 289         return 0;
 290 }
 291
 292 #ifdef CONFIG_HPDCA
 293 static void __devexit hpdca_remove_one(struct dio_dev *d)
 294 {
 295         int line;
 296
 297         line = (int) dio_get_drvdata(d);
 298         if (d->resource.start) {
 299                 /* Disable board-interrupts */
 300                 out_8(d->resource.start + DIO_VIRADDRBASE + DCA_IC, 0);
 301         }
 302         unregister_serial(line);
 303 }
 304 #endif
 305
 306 static void __exit hp300_8250_exit(void)
 307 {
 308 #ifdef CONFIG_HPAPCI
 309         struct hp300_port *port, *to_free;
 310
 311         for (port = hp300_ports; port; ) {
 312                 unregister_serial(port->line);
 313                 to_free = port;
 314                 port = port->next;
 315                 kfree(to_free);
 316         }
 317
 318         hp300_ports = NULL;
 319 #endif
 320 #ifdef CONFIG_HPDCA
 321         dio_unregister_driver(&hpdca_driver);
 322 #endif
 323 }
 324
 325 module_init(hp300_8250_init);
 326 module_exit(hp300_8250_exit);
 327 MODULE_DESCRIPTION("HP DCA/APCI serial driver");
 328 MODULE_AUTHOR("Kars de Jong <jongk@linux-m68k.org>");
 329 MODULE_LICENSE("GPL");