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_8250.h> 14 #include <linux/delay.h> 15 #include <linux/dio.h> 16 #include <linux/console.h> 17 #include <linux/slab.h> 18 #include <asm/io.h> 19 20 #include "8250.h" 21 22 #if !defined(CONFIG_HPDCA) && !defined(CONFIG_HPAPCI) 23 #warning CONFIG_SERIAL_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 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 hpdca_init_one(struct dio_dev *d, 38 const struct dio_device_id *ent); 39 static void 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 = hpdca_remove_one, 54 }; 55 56 #endif 57 58 static unsigned int num_ports; 59 60 extern int hp300_uart_scode; 61 62 /* Offset to UART registers from base of DCA */ 63 #define UART_OFFSET 17 64 65 #define DCA_ID 0x01 /* ID (read), reset (write) */ 66 #define DCA_IC 0x03 /* Interrupt control */ 67 68 /* Interrupt control */ 69 #define DCA_IC_IE 0x80 /* Master interrupt enable */ 70 71 #define HPDCA_BAUD_BASE 153600 72 73 /* Base address of the Frodo part */ 74 #define FRODO_BASE (0x41c000) 75 76 /* 77 * Where we find the 8250-like APCI ports, and how far apart they are. 78 */ 79 #define FRODO_APCIBASE 0x0 80 #define FRODO_APCISPACE 0x20 81 #define FRODO_APCI_OFFSET(x) (FRODO_APCIBASE + ((x) * FRODO_APCISPACE)) 82 83 #define HPAPCI_BAUD_BASE 500400 84 85 #ifdef CONFIG_SERIAL_8250_CONSOLE 86 /* 87 * Parse the bootinfo to find descriptions for headless console and 88 * debug serial ports and register them with the 8250 driver. 89 */ 90 int __init hp300_setup_serial_console(void) 91 { 92 int scode; 93 struct uart_port port; 94 95 memset(&port, 0, sizeof(port)); 96 97 if (hp300_uart_scode < 0 || hp300_uart_scode > DIO_SCMAX) 98 return 0; 99 100 if (DIO_SCINHOLE(hp300_uart_scode)) 101 return 0; 102 103 scode = hp300_uart_scode; 104 105 /* Memory mapped I/O */ 106 port.iotype = UPIO_MEM; 107 port.flags = UPF_SKIP_TEST | UPF_SHARE_IRQ | UPF_BOOT_AUTOCONF; 108 port.type = PORT_UNKNOWN; 109 110 /* Check for APCI console */ 111 if (scode == 256) { 112 #ifdef CONFIG_HPAPCI 113 pr_info("Serial console is HP APCI 1\n"); 114 115 port.uartclk = HPAPCI_BAUD_BASE * 16; 116 port.mapbase = (FRODO_BASE + FRODO_APCI_OFFSET(1)); 117 port.membase = (char *)(port.mapbase + DIO_VIRADDRBASE); 118 port.regshift = 2; 119 add_preferred_console("ttyS", port.line, "9600n8"); 120 #else 121 pr_warn("Serial console is APCI but support is disabled (CONFIG_HPAPCI)!\n"); 122 return 0; 123 #endif 124 } else { 125 #ifdef CONFIG_HPDCA 126 unsigned long pa = dio_scodetophysaddr(scode); 127 if (!pa) 128 return 0; 129 130 pr_info("Serial console is HP DCA at select code %d\n", scode); 131 132 port.uartclk = HPDCA_BAUD_BASE * 16; 133 port.mapbase = (pa + UART_OFFSET); 134 port.membase = (char *)(port.mapbase + DIO_VIRADDRBASE); 135 port.regshift = 1; 136 port.irq = DIO_IPL(pa + DIO_VIRADDRBASE); 137 138 /* Enable board-interrupts */ 139 out_8(pa + DIO_VIRADDRBASE + DCA_IC, DCA_IC_IE); 140 141 if (DIO_ID(pa + DIO_VIRADDRBASE) & 0x80) 142 add_preferred_console("ttyS", port.line, "9600n8"); 143 #else 144 pr_warn("Serial console is DCA but support is disabled (CONFIG_HPDCA)!\n"); 145 return 0; 146 #endif 147 } 148 149 if (early_serial_setup(&port) < 0) 150 pr_warn("%s: early_serial_setup() failed.\n", __func__); 151 return 0; 152 } 153 #endif /* CONFIG_SERIAL_8250_CONSOLE */ 154 155 #ifdef CONFIG_HPDCA 156 static int hpdca_init_one(struct dio_dev *d, 157 const struct dio_device_id *ent) 158 { 159 struct uart_8250_port uart; 160 int line; 161 162 #ifdef CONFIG_SERIAL_8250_CONSOLE 163 if (hp300_uart_scode == d->scode) { 164 /* Already got it. */ 165 return 0; 166 } 167 #endif 168 memset(&uart, 0, sizeof(uart)); 169 170 /* Memory mapped I/O */ 171 uart.port.iotype = UPIO_MEM; 172 uart.port.flags = UPF_SKIP_TEST | UPF_SHARE_IRQ | UPF_BOOT_AUTOCONF; 173 uart.port.irq = d->ipl; 174 uart.port.uartclk = HPDCA_BAUD_BASE * 16; 175 uart.port.mapbase = (d->resource.start + UART_OFFSET); 176 uart.port.membase = (char *)(uart.port.mapbase + DIO_VIRADDRBASE); 177 uart.port.regshift = 1; 178 uart.port.dev = &d->dev; 179 line = serial8250_register_8250_port(&uart); 180 181 if (line < 0) { 182 dev_notice(&d->dev, 183 "8250_hp300: register_serial() DCA scode %d irq %d failed\n", 184 d->scode, uart.port.irq); 185 return -ENOMEM; 186 } 187 188 /* Enable board-interrupts */ 189 out_8(d->resource.start + DIO_VIRADDRBASE + DCA_IC, DCA_IC_IE); 190 dio_set_drvdata(d, (void *)line); 191 192 /* Reset the DCA */ 193 out_8(d->resource.start + DIO_VIRADDRBASE + DCA_ID, 0xff); 194 udelay(100); 195 196 num_ports++; 197 198 return 0; 199 } 200 #endif 201 202 static int __init hp300_8250_init(void) 203 { 204 static int called; 205 #ifdef CONFIG_HPAPCI 206 int line; 207 unsigned long base; 208 struct uart_8250_port uart; 209 struct hp300_port *port; 210 int i; 211 #endif 212 if (called) 213 return -ENODEV; 214 called = 1; 215 216 if (!MACH_IS_HP300) 217 return -ENODEV; 218 219 #ifdef CONFIG_HPDCA 220 dio_register_driver(&hpdca_driver); 221 #endif 222 #ifdef CONFIG_HPAPCI 223 if (hp300_model < HP_400) { 224 if (!num_ports) 225 return -ENODEV; 226 return 0; 227 } 228 /* These models have the Frodo chip. 229 * Port 0 is reserved for the Apollo Domain keyboard. 230 * Port 1 is either the console or the DCA. 231 */ 232 for (i = 1; i < 4; i++) { 233 /* Port 1 is the console on a 425e, on other machines it's 234 * mapped to DCA. 235 */ 236 #ifdef CONFIG_SERIAL_8250_CONSOLE 237 if (i == 1) 238 continue; 239 #endif 240 241 /* Create new serial device */ 242 port = kmalloc(sizeof(struct hp300_port), GFP_KERNEL); 243 if (!port) 244 return -ENOMEM; 245 246 memset(&uart, 0, sizeof(uart)); 247 248 base = (FRODO_BASE + FRODO_APCI_OFFSET(i)); 249 250 /* Memory mapped I/O */ 251 uart.port.iotype = UPIO_MEM; 252 uart.port.flags = UPF_SKIP_TEST | UPF_SHARE_IRQ 253 | UPF_BOOT_AUTOCONF; 254 /* XXX - no interrupt support yet */ 255 uart.port.irq = 0; 256 uart.port.uartclk = HPAPCI_BAUD_BASE * 16; 257 uart.port.mapbase = base; 258 uart.port.membase = (char *)(base + DIO_VIRADDRBASE); 259 uart.port.regshift = 2; 260 261 line = serial8250_register_8250_port(&uart); 262 263 if (line < 0) { 264 dev_notice(uart.port.dev, 265 "8250_hp300: register_serial() APCI %d irq %d failed\n", 266 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