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 28struct hp300_port 29{ 30 struct hp300_port *next; /* next port */ 31 int line; /* line (tty) number */ 32}; 33 34static struct hp300_port *hp300_ports; 35#endif 36 37#ifdef CONFIG_HPDCA 38 39static int __devinit hpdca_init_one(struct dio_dev *d, 40 const struct dio_device_id *ent); 41static void __devexit hpdca_remove_one(struct dio_dev *d); 42 43static 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 51static 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 60static unsigned int num_ports; 61 62extern 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 */ 96int __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 162static 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 207static 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 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 290static 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 303static 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 322module_init(hp300_8250_init); 323module_exit(hp300_8250_exit); 324MODULE_DESCRIPTION("HP DCA/APCI serial driver"); 325MODULE_AUTHOR("Kars de Jong <jongk@linux-m68k.org>"); 326MODULE_LICENSE("GPL"); 327