1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Driver for the 98626/98644/internal serial interface on hp300/hp400 4 * (based on the National Semiconductor INS8250/NS16550AF/WD16C552 UARTs) 5 * 6 * Ported from 2.2 and modified to use the normal 8250 driver 7 * by Kars de Jong <jongk@linux-m68k.org>, May 2004. 8 */ 9 #include <linux/module.h> 10 #include <linux/init.h> 11 #include <linux/string.h> 12 #include <linux/kernel.h> 13 #include <linux/serial.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) && !defined(CONFIG_COMPILE_TEST) 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 struct hp300_port *next; /* next port */ 30 int line; /* line (tty) number */ 31 }; 32 33 static struct hp300_port *hp300_ports; 34 #endif 35 36 #ifdef CONFIG_HPDCA 37 38 static int hpdca_init_one(struct dio_dev *d, 39 const struct dio_device_id *ent); 40 static void hpdca_remove_one(struct dio_dev *d); 41 42 static struct dio_device_id hpdca_dio_tbl[] = { 43 { DIO_ID_DCA0 }, 44 { DIO_ID_DCA0REM }, 45 { DIO_ID_DCA1 }, 46 { DIO_ID_DCA1REM }, 47 { 0 } 48 }; 49 50 static struct dio_driver hpdca_driver = { 51 .name = "hpdca", 52 .id_table = hpdca_dio_tbl, 53 .probe = hpdca_init_one, 54 .remove = hpdca_remove_one, 55 }; 56 57 #endif 58 59 static unsigned int num_ports; 60 61 extern int hp300_uart_scode; 62 63 /* Offset to UART registers from base of DCA */ 64 #define UART_OFFSET 17 65 66 #define DCA_ID 0x01 /* ID (read), reset (write) */ 67 #define DCA_IC 0x03 /* Interrupt control */ 68 69 /* Interrupt control */ 70 #define DCA_IC_IE 0x80 /* Master interrupt enable */ 71 72 #define HPDCA_BAUD_BASE 153600 73 74 /* Base address of the Frodo part */ 75 #define FRODO_BASE (0x41c000) 76 77 /* 78 * Where we find the 8250-like APCI ports, and how far apart they are. 79 */ 80 #define FRODO_APCIBASE 0x0 81 #define FRODO_APCISPACE 0x20 82 #define FRODO_APCI_OFFSET(x) (FRODO_APCIBASE + ((x) * FRODO_APCISPACE)) 83 84 #define HPAPCI_BAUD_BASE 500400 85 86 #ifdef CONFIG_SERIAL_8250_CONSOLE 87 /* 88 * Parse the bootinfo to find descriptions for headless console and 89 * debug serial ports and register them with the 8250 driver. 90 */ hp300_setup_serial_console(void)91 int __init hp300_setup_serial_console(void) 92 { 93 int scode; 94 struct uart_port port; 95 96 memset(&port, 0, sizeof(port)); 97 98 if (hp300_uart_scode < 0 || hp300_uart_scode > DIO_SCMAX) 99 return 0; 100 101 if (DIO_SCINHOLE(hp300_uart_scode)) 102 return 0; 103 104 scode = hp300_uart_scode; 105 106 /* Memory mapped I/O */ 107 port.iotype = UPIO_MEM; 108 port.flags = UPF_SKIP_TEST | UPF_SHARE_IRQ | UPF_BOOT_AUTOCONF; 109 port.type = PORT_UNKNOWN; 110 111 /* Check for APCI console */ 112 if (scode == 256) { 113 #ifdef CONFIG_HPAPCI 114 pr_info("Serial console is HP APCI 1\n"); 115 116 port.uartclk = HPAPCI_BAUD_BASE * 16; 117 port.mapbase = (FRODO_BASE + FRODO_APCI_OFFSET(1)); 118 port.membase = (char *)(port.mapbase + DIO_VIRADDRBASE); 119 port.regshift = 2; 120 add_preferred_console("ttyS", port.line, "9600n8"); 121 #else 122 pr_warn("Serial console is APCI but support is disabled (CONFIG_HPAPCI)!\n"); 123 return 0; 124 #endif 125 } else { 126 #ifdef CONFIG_HPDCA 127 unsigned long pa = dio_scodetophysaddr(scode); 128 if (!pa) 129 return 0; 130 131 pr_info("Serial console is HP DCA at select code %d\n", scode); 132 133 port.uartclk = HPDCA_BAUD_BASE * 16; 134 port.mapbase = (pa + UART_OFFSET); 135 port.membase = (char *)(port.mapbase + DIO_VIRADDRBASE); 136 port.regshift = 1; 137 port.irq = DIO_IPL(pa + DIO_VIRADDRBASE); 138 139 /* Enable board-interrupts */ 140 out_8(pa + DIO_VIRADDRBASE + DCA_IC, DCA_IC_IE); 141 142 if (DIO_ID(pa + DIO_VIRADDRBASE) & 0x80) 143 add_preferred_console("ttyS", port.line, "9600n8"); 144 #else 145 pr_warn("Serial console is DCA but support is disabled (CONFIG_HPDCA)!\n"); 146 return 0; 147 #endif 148 } 149 150 if (early_serial_setup(&port) < 0) 151 pr_warn("%s: early_serial_setup() failed.\n", __func__); 152 return 0; 153 } 154 #endif /* CONFIG_SERIAL_8250_CONSOLE */ 155 156 #ifdef CONFIG_HPDCA hpdca_init_one(struct dio_dev * d,const struct dio_device_id * ent)157 static int hpdca_init_one(struct dio_dev *d, 158 const struct dio_device_id *ent) 159 { 160 struct uart_8250_port uart; 161 int line; 162 163 #ifdef CONFIG_SERIAL_8250_CONSOLE 164 if (hp300_uart_scode == d->scode) { 165 /* Already got it. */ 166 return 0; 167 } 168 #endif 169 memset(&uart, 0, sizeof(uart)); 170 171 /* Memory mapped I/O */ 172 uart.port.iotype = UPIO_MEM; 173 uart.port.flags = UPF_SKIP_TEST | UPF_SHARE_IRQ | UPF_BOOT_AUTOCONF; 174 uart.port.irq = d->ipl; 175 uart.port.uartclk = HPDCA_BAUD_BASE * 16; 176 uart.port.mapbase = (d->resource.start + UART_OFFSET); 177 uart.port.membase = (char *)(uart.port.mapbase + DIO_VIRADDRBASE); 178 uart.port.regshift = 1; 179 uart.port.dev = &d->dev; 180 line = serial8250_register_8250_port(&uart); 181 182 if (line < 0) { 183 dev_notice(&d->dev, 184 "8250_hp300: register_serial() DCA scode %d irq %d failed\n", 185 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 hp300_8250_init(void)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 dev_notice(uart.port.dev, 266 "8250_hp300: register_serial() APCI %d irq %d failed\n", 267 i, uart.port.irq); 268 kfree(port); 269 continue; 270 } 271 272 port->line = line; 273 port->next = hp300_ports; 274 hp300_ports = port; 275 276 num_ports++; 277 } 278 #endif 279 280 /* Any boards found? */ 281 if (!num_ports) 282 return -ENODEV; 283 284 return 0; 285 } 286 287 #ifdef CONFIG_HPDCA hpdca_remove_one(struct dio_dev * d)288 static void hpdca_remove_one(struct dio_dev *d) 289 { 290 int line; 291 292 line = (int) dio_get_drvdata(d); 293 if (d->resource.start) { 294 /* Disable board-interrupts */ 295 out_8(d->resource.start + DIO_VIRADDRBASE + DCA_IC, 0); 296 } 297 serial8250_unregister_port(line); 298 } 299 #endif 300 hp300_8250_exit(void)301 static void __exit hp300_8250_exit(void) 302 { 303 #ifdef CONFIG_HPAPCI 304 struct hp300_port *port, *to_free; 305 306 for (port = hp300_ports; port; ) { 307 serial8250_unregister_port(port->line); 308 to_free = port; 309 port = port->next; 310 kfree(to_free); 311 } 312 313 hp300_ports = NULL; 314 #endif 315 #ifdef CONFIG_HPDCA 316 dio_unregister_driver(&hpdca_driver); 317 #endif 318 } 319 320 module_init(hp300_8250_init); 321 module_exit(hp300_8250_exit); 322 MODULE_DESCRIPTION("HP DCA/APCI serial driver"); 323 MODULE_AUTHOR("Kars de Jong <jongk@linux-m68k.org>"); 324 MODULE_LICENSE("GPL"); 325