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 28 struct hp300_port 29 { 30 struct hp300_port *next; /* next port */ 31 int line; /* line (tty) number */ 32 }; 33 34 static struct hp300_port *hp300_ports; 35 #endif 36 37 #ifdef CONFIG_HPDCA 38 39 static int hpdca_init_one(struct dio_dev *d, 40 const struct dio_device_id *ent); 41 static void hpdca_remove_one(struct dio_dev *d); 42 43 static 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 51 static struct dio_driver hpdca_driver = { 52 .name = "hpdca", 53 .id_table = hpdca_dio_tbl, 54 .probe = hpdca_init_one, 55 .remove = hpdca_remove_one, 56 }; 57 58 #endif 59 60 static unsigned int num_ports; 61 62 extern 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 */ 96 int __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 162 static int hpdca_init_one(struct dio_dev *d, 163 const struct dio_device_id *ent) 164 { 165 struct uart_8250_port uart; 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(&uart, 0, sizeof(uart)); 175 176 /* Memory mapped I/O */ 177 uart.port.iotype = UPIO_MEM; 178 uart.port.flags = UPF_SKIP_TEST | UPF_SHARE_IRQ | UPF_BOOT_AUTOCONF; 179 uart.port.irq = d->ipl; 180 uart.port.uartclk = HPDCA_BAUD_BASE * 16; 181 uart.port.mapbase = (d->resource.start + UART_OFFSET); 182 uart.port.membase = (char *)(uart.port.mapbase + DIO_VIRADDRBASE); 183 uart.port.regshift = 1; 184 uart.port.dev = &d->dev; 185 line = serial8250_register_8250_port(&uart); 186 187 if (line < 0) { 188 printk(KERN_NOTICE "8250_hp300: register_serial() DCA scode %d" 189 " irq %d failed\n", d->scode, uart.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 206 207 static 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_8250_port uart; 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(&uart, 0, sizeof(uart)); 252 253 base = (FRODO_BASE + FRODO_APCI_OFFSET(i)); 254 255 /* Memory mapped I/O */ 256 uart.port.iotype = UPIO_MEM; 257 uart.port.flags = UPF_SKIP_TEST | UPF_SHARE_IRQ \ 258 | UPF_BOOT_AUTOCONF; 259 /* XXX - no interrupt support yet */ 260 uart.port.irq = 0; 261 uart.port.uartclk = HPAPCI_BAUD_BASE * 16; 262 uart.port.mapbase = base; 263 uart.port.membase = (char *)(base + DIO_VIRADDRBASE); 264 uart.port.regshift = 2; 265 266 line = serial8250_register_8250_port(&uart); 267 268 if (line < 0) { 269 printk(KERN_NOTICE "8250_hp300: register_serial() APCI" 270 " %d irq %d failed\n", i, uart.port.irq); 271 kfree(port); 272 continue; 273 } 274 275 port->line = line; 276 port->next = hp300_ports; 277 hp300_ports = port; 278 279 num_ports++; 280 } 281 #endif 282 283 /* Any boards found? */ 284 if (!num_ports) 285 return -ENODEV; 286 287 return 0; 288 } 289 290 #ifdef CONFIG_HPDCA 291 static void hpdca_remove_one(struct dio_dev *d) 292 { 293 int line; 294 295 line = (int) dio_get_drvdata(d); 296 if (d->resource.start) { 297 /* Disable board-interrupts */ 298 out_8(d->resource.start + DIO_VIRADDRBASE + DCA_IC, 0); 299 } 300 serial8250_unregister_port(line); 301 } 302 #endif 303 304 static void __exit hp300_8250_exit(void) 305 { 306 #ifdef CONFIG_HPAPCI 307 struct hp300_port *port, *to_free; 308 309 for (port = hp300_ports; port; ) { 310 serial8250_unregister_port(port->line); 311 to_free = port; 312 port = port->next; 313 kfree(to_free); 314 } 315 316 hp300_ports = NULL; 317 #endif 318 #ifdef CONFIG_HPDCA 319 dio_unregister_driver(&hpdca_driver); 320 #endif 321 } 322 323 module_init(hp300_8250_init); 324 module_exit(hp300_8250_exit); 325 MODULE_DESCRIPTION("HP DCA/APCI serial driver"); 326 MODULE_AUTHOR("Kars de Jong <jongk@linux-m68k.org>"); 327 MODULE_LICENSE("GPL"); 328