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_SERIAL_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 */ 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 } else { 127 #ifdef CONFIG_HPDCA 128 unsigned long pa = dio_scodetophysaddr(scode); 129 if (!pa) 130 return 0; 131 132 printk(KERN_INFO "Serial console is HP DCA at select code %d\n", scode); 133 134 port.uartclk = HPDCA_BAUD_BASE * 16; 135 port.mapbase = (pa + UART_OFFSET); 136 port.membase = (char *)(port.mapbase + DIO_VIRADDRBASE); 137 port.regshift = 1; 138 port.irq = DIO_IPL(pa + DIO_VIRADDRBASE); 139 140 /* Enable board-interrupts */ 141 out_8(pa + DIO_VIRADDRBASE + DCA_IC, DCA_IC_IE); 142 143 if (DIO_ID(pa + DIO_VIRADDRBASE) & 0x80) 144 add_preferred_console("ttyS", port.line, "9600n8"); 145 #else 146 printk(KERN_WARNING "Serial console is DCA but support is disabled (CONFIG_HPDCA)!\n"); 147 return 0; 148 #endif 149 } 150 151 if (early_serial_setup(&port) < 0) 152 printk(KERN_WARNING "hp300_setup_serial_console(): early_serial_setup() failed.\n"); 153 return 0; 154 } 155 #endif /* CONFIG_SERIAL_8250_CONSOLE */ 156 157 #ifdef CONFIG_HPDCA 158 static int hpdca_init_one(struct dio_dev *d, 159 const struct dio_device_id *ent) 160 { 161 struct uart_8250_port uart; 162 int line; 163 164 #ifdef CONFIG_SERIAL_8250_CONSOLE 165 if (hp300_uart_scode == d->scode) { 166 /* Already got it. */ 167 return 0; 168 } 169 #endif 170 memset(&uart, 0, sizeof(uart)); 171 172 /* Memory mapped I/O */ 173 uart.port.iotype = UPIO_MEM; 174 uart.port.flags = UPF_SKIP_TEST | UPF_SHARE_IRQ | UPF_BOOT_AUTOCONF; 175 uart.port.irq = d->ipl; 176 uart.port.uartclk = HPDCA_BAUD_BASE * 16; 177 uart.port.mapbase = (d->resource.start + UART_OFFSET); 178 uart.port.membase = (char *)(uart.port.mapbase + DIO_VIRADDRBASE); 179 uart.port.regshift = 1; 180 uart.port.dev = &d->dev; 181 line = serial8250_register_8250_port(&uart); 182 183 if (line < 0) { 184 printk(KERN_NOTICE "8250_hp300: register_serial() DCA scode %d" 185 " irq %d failed\n", d->scode, uart.port.irq); 186 return -ENOMEM; 187 } 188 189 /* Enable board-interrupts */ 190 out_8(d->resource.start + DIO_VIRADDRBASE + DCA_IC, DCA_IC_IE); 191 dio_set_drvdata(d, (void *)line); 192 193 /* Reset the DCA */ 194 out_8(d->resource.start + DIO_VIRADDRBASE + DCA_ID, 0xff); 195 udelay(100); 196 197 num_ports++; 198 199 return 0; 200 } 201 #endif 202 203 static int __init hp300_8250_init(void) 204 { 205 static int called; 206 #ifdef CONFIG_HPAPCI 207 int line; 208 unsigned long base; 209 struct uart_8250_port uart; 210 struct hp300_port *port; 211 int i; 212 #endif 213 if (called) 214 return -ENODEV; 215 called = 1; 216 217 if (!MACH_IS_HP300) 218 return -ENODEV; 219 220 #ifdef CONFIG_HPDCA 221 dio_register_driver(&hpdca_driver); 222 #endif 223 #ifdef CONFIG_HPAPCI 224 if (hp300_model < HP_400) { 225 if (!num_ports) 226 return -ENODEV; 227 return 0; 228 } 229 /* These models have the Frodo chip. 230 * Port 0 is reserved for the Apollo Domain keyboard. 231 * Port 1 is either the console or the DCA. 232 */ 233 for (i = 1; i < 4; i++) { 234 /* Port 1 is the console on a 425e, on other machines it's 235 * mapped to DCA. 236 */ 237 #ifdef CONFIG_SERIAL_8250_CONSOLE 238 if (i == 1) 239 continue; 240 #endif 241 242 /* Create new serial device */ 243 port = kmalloc(sizeof(struct hp300_port), GFP_KERNEL); 244 if (!port) 245 return -ENOMEM; 246 247 memset(&uart, 0, sizeof(uart)); 248 249 base = (FRODO_BASE + FRODO_APCI_OFFSET(i)); 250 251 /* Memory mapped I/O */ 252 uart.port.iotype = UPIO_MEM; 253 uart.port.flags = UPF_SKIP_TEST | UPF_SHARE_IRQ \ 254 | UPF_BOOT_AUTOCONF; 255 /* XXX - no interrupt support yet */ 256 uart.port.irq = 0; 257 uart.port.uartclk = HPAPCI_BAUD_BASE * 16; 258 uart.port.mapbase = base; 259 uart.port.membase = (char *)(base + DIO_VIRADDRBASE); 260 uart.port.regshift = 2; 261 262 line = serial8250_register_8250_port(&uart); 263 264 if (line < 0) { 265 printk(KERN_NOTICE "8250_hp300: register_serial() APCI" 266 " %d irq %d failed\n", i, uart.port.irq); 267 kfree(port); 268 continue; 269 } 270 271 port->line = line; 272 port->next = hp300_ports; 273 hp300_ports = port; 274 275 num_ports++; 276 } 277 #endif 278 279 /* Any boards found? */ 280 if (!num_ports) 281 return -ENODEV; 282 283 return 0; 284 } 285 286 #ifdef CONFIG_HPDCA 287 static void hpdca_remove_one(struct dio_dev *d) 288 { 289 int line; 290 291 line = (int) dio_get_drvdata(d); 292 if (d->resource.start) { 293 /* Disable board-interrupts */ 294 out_8(d->resource.start + DIO_VIRADDRBASE + DCA_IC, 0); 295 } 296 serial8250_unregister_port(line); 297 } 298 #endif 299 300 static void __exit hp300_8250_exit(void) 301 { 302 #ifdef CONFIG_HPAPCI 303 struct hp300_port *port, *to_free; 304 305 for (port = hp300_ports; port; ) { 306 serial8250_unregister_port(port->line); 307 to_free = port; 308 port = port->next; 309 kfree(to_free); 310 } 311 312 hp300_ports = NULL; 313 #endif 314 #ifdef CONFIG_HPDCA 315 dio_unregister_driver(&hpdca_driver); 316 #endif 317 } 318 319 module_init(hp300_8250_init); 320 module_exit(hp300_8250_exit); 321 MODULE_DESCRIPTION("HP DCA/APCI serial driver"); 322 MODULE_AUTHOR("Kars de Jong <jongk@linux-m68k.org>"); 323 MODULE_LICENSE("GPL"); 324