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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>

20 #include "8250.h"

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

26 #ifdef CONFIG_HPAPCI

27 struct hp300_port

28 {

29 struct hp300_port *next; /* next port */

30 int line; /* line (tty) number */

31 };

33 static struct hp300_port *hp300_ports;

34 #endif

36 #ifdef CONFIG_HPDCA

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);

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 };

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 };

57 #endif

59 static unsigned int num_ports;

61 extern int hp300_uart_scode;

63 /* Offset to UART registers from base of DCA */

64 #define UART_OFFSET 17

66 #define DCA_ID 0x01 /* ID (read), reset (write) */

67 #define DCA_IC 0x03 /* Interrupt control */

69 /* Interrupt control */

70 #define DCA_IC_IE 0x80 /* Master interrupt enable */

72 #define HPDCA_BAUD_BASE 153600

74 /* Base address of the Frodo part */

75 #define FRODO_BASE (0x41c000)

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))

84 #define HPAPCI_BAUD_BASE 500400

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 */

91 int __init hp300_setup_serial_console(void)

92 {

93 int scode;

94 struct uart_port port;

96 memset(&port, 0, sizeof(port));

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 printk(KERN_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 printk(KERN_WARNING "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 printk(KERN_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 printk(KERN_WARNING "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 printk(KERN_WARNING "hp300_setup_serial_console(): early_serial_setup() failed.\n");

152 return 0;

153 }

154 #endif /* CONFIG_SERIAL_8250_CONSOLE */

155

156 #ifdef CONFIG_HPDCA

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 printk(KERN_NOTICE "8250_hp300: register_serial() DCA scode %d"

184 " irq %d failed\n", 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 printk(KERN_NOTICE "8250_hp300: register_serial() APCI"

265 " %d irq %d failed\n", i, uart.port.irq);

266 kfree(port);

267 continue;

268 }

269

270 port->line = line;

271 port->next = hp300_ports;

272 hp300_ports = port;

273

274 num_ports++;

275 }

276 #endif

277

278 /* Any boards found? */

279 if (!num_ports)

280 return -ENODEV;

281

282 return 0;

283 }

284

285 #ifdef CONFIG_HPDCA

286 static void hpdca_remove_one(struct dio_dev *d)

287 {

288 int line;

289

290 line = (int) dio_get_drvdata(d);

291 if (d->resource.start) {

292 /* Disable board-interrupts */

293 out_8(d->resource.start + DIO_VIRADDRBASE + DCA_IC, 0);

294 }

295 serial8250_unregister_port(line);

296 }

297 #endif

298

299 static void __exit hp300_8250_exit(void)

300 {

301 #ifdef CONFIG_HPAPCI

302 struct hp300_port *port, *to_free;

303

304 for (port = hp300_ports; port; ) {

305 serial8250_unregister_port(port->line);

306 to_free = port;

307 port = port->next;

308 kfree(to_free);

309 }

310

311 hp300_ports = NULL;

312 #endif

313 #ifdef CONFIG_HPDCA

314 dio_unregister_driver(&hpdca_driver);

315 #endif

316 }

317

318 module_init(hp300_8250_init);

319 module_exit(hp300_8250_exit);

320 MODULE_DESCRIPTION("HP DCA/APCI serial driver");

321 MODULE_AUTHOR("Kars de Jong <jongk@linux-m68k.org>");

322 MODULE_LICENSE("GPL");