2 * Driver for the 98626/98644/internal serial interface on hp300/hp400
3 * (based on the National Semiconductor INS8250/NS16550AF/WD16C552 UARTs)
5 * Ported from 2.2 and modified to use the normal 8250 driver
6 * by Kars de Jong <jongk@linux-m68k.org>, May 2004.
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/delay.h>
15 #include <linux/dio.h>
16 #include <linux/console.h>
21 #if !defined(CONFIG_HPDCA) && !defined(CONFIG_HPAPCI)
22 #warning CONFIG_8250 defined but neither CONFIG_HPDCA nor CONFIG_HPAPCI defined, are you sure?
28 struct hp300_port *next; /* next port */
29 int line; /* line (tty) number */
32 static struct hp300_port *hp300_ports;
37 static int __devinit hpdca_init_one(struct dio_dev *d,
38 const struct dio_device_id *ent);
39 static void __devexit hpdca_remove_one(struct dio_dev *d);
41 static struct dio_device_id hpdca_dio_tbl[] = {
49 static struct dio_driver hpdca_driver = {
51 .id_table = hpdca_dio_tbl,
52 .probe = hpdca_init_one,
53 .remove = __devexit_p(hpdca_remove_one),
58 static unsigned int num_ports;
60 extern int hp300_uart_scode;
62 /* Offset to UART registers from base of DCA */
63 #define UART_OFFSET 17
65 #define DCA_ID 0x01 /* ID (read), reset (write) */
66 #define DCA_IC 0x03 /* Interrupt control */
68 /* Interrupt control */
69 #define DCA_IC_IE 0x80 /* Master interrupt enable */
71 #define HPDCA_BAUD_BASE 153600
73 /* Base address of the Frodo part */
74 #define FRODO_BASE (0x41c000)
77 * Where we find the 8250-like APCI ports, and how far apart they are.
79 #define FRODO_APCIBASE 0x0
80 #define FRODO_APCISPACE 0x20
81 #define FRODO_APCI_OFFSET(x) (FRODO_APCIBASE + ((x) * FRODO_APCISPACE))
83 #define HPAPCI_BAUD_BASE 500400
85 #ifdef CONFIG_SERIAL_8250_CONSOLE
87 * Parse the bootinfo to find descriptions for headless console and
88 * debug serial ports and register them with the 8250 driver.
89 * This function should be called before serial_console_init() is called
90 * to make sure the serial console will be available for use. IA-64 kernel
91 * calls this function from setup_arch() after the EFI and ACPI tables have
94 int __init hp300_setup_serial_console(void)
97 struct uart_port port;
99 memset(&port, 0, sizeof(port));
101 if (hp300_uart_scode < 0 || hp300_uart_scode > DIO_SCMAX)
104 if (DIO_SCINHOLE(hp300_uart_scode))
107 scode = hp300_uart_scode;
109 /* Memory mapped I/O */
110 port.iotype = UPIO_MEM;
111 port.flags = UPF_SKIP_TEST | UPF_SHARE_IRQ | UPF_BOOT_AUTOCONF;
112 port.type = PORT_UNKNOWN;
114 /* Check for APCI console */
117 printk(KERN_INFO "Serial console is HP APCI 1\n");
119 port.uartclk = HPAPCI_BAUD_BASE * 16;
120 port.mapbase = (FRODO_BASE + FRODO_APCI_OFFSET(1));
121 port.membase = (char *)(port.mapbase + DIO_VIRADDRBASE);
123 add_preferred_console("ttyS", port.line, "9600n8");
125 printk(KERN_WARNING "Serial console is APCI but support is disabled (CONFIG_HPAPCI)!\n");
131 unsigned long pa = dio_scodetophysaddr(scode);
136 printk(KERN_INFO "Serial console is HP DCA at select code %d\n", scode);
138 port.uartclk = HPDCA_BAUD_BASE * 16;
139 port.mapbase = (pa + UART_OFFSET);
140 port.membase = (char *)(port.mapbase + DIO_VIRADDRBASE);
142 port.irq = DIO_IPL(pa + DIO_VIRADDRBASE);
144 /* Enable board-interrupts */
145 out_8(pa + DIO_VIRADDRBASE + DCA_IC, DCA_IC_IE);
147 if (DIO_ID(pa + DIO_VIRADDRBASE) & 0x80) {
148 add_preferred_console("ttyS", port.line, "9600n8");
151 printk(KERN_WARNING "Serial console is DCA but support is disabled (CONFIG_HPDCA)!\n");
156 if (early_serial_setup(&port) < 0) {
157 printk(KERN_WARNING "hp300_setup_serial_console(): early_serial_setup() failed.\n");
162 #endif /* CONFIG_SERIAL_8250_CONSOLE */
165 static int __devinit hpdca_init_one(struct dio_dev *d,
166 const struct dio_device_id *ent)
168 struct uart_port port;
171 #ifdef CONFIG_SERIAL_8250_CONSOLE
172 if (hp300_uart_scode == d->scode) {
173 /* Already got it. */
177 memset(&port, 0, sizeof(struct uart_port));
179 /* Memory mapped I/O */
180 port.iotype = UPIO_MEM;
181 port.flags = UPF_SKIP_TEST | UPF_SHARE_IRQ | UPF_BOOT_AUTOCONF;
183 port.uartclk = HPDCA_BAUD_BASE * 16;
184 port.mapbase = (d->resource.start + UART_OFFSET);
185 port.membase = (char *)(port.mapbase + DIO_VIRADDRBASE);
188 line = serial8250_register_port(&port);
191 printk(KERN_NOTICE "8250_hp300: register_serial() DCA scode %d"
192 " irq %d failed\n", d->scode, port.irq);
196 /* Enable board-interrupts */
197 out_8(d->resource.start + DIO_VIRADDRBASE + DCA_IC, DCA_IC_IE);
198 dio_set_drvdata(d, (void *)line);
201 out_8(d->resource.start + DIO_VIRADDRBASE + DCA_ID, 0xff);
210 static int __init hp300_8250_init(void)
212 static int called = 0;
216 struct uart_port uport;
217 struct hp300_port *port;
228 dio_register_driver(&hpdca_driver);
231 if (hp300_model < HP_400) {
236 /* These models have the Frodo chip.
237 * Port 0 is reserved for the Apollo Domain keyboard.
238 * Port 1 is either the console or the DCA.
240 for (i = 1; i < 4; i++) {
241 /* Port 1 is the console on a 425e, on other machines it's mapped to
244 #ifdef CONFIG_SERIAL_8250_CONSOLE
250 /* Create new serial device */
251 port = kmalloc(sizeof(struct hp300_port), GFP_KERNEL);
255 memset(&uport, 0, sizeof(struct uart_port));
257 base = (FRODO_BASE + FRODO_APCI_OFFSET(i));
259 /* Memory mapped I/O */
260 uport.iotype = UPIO_MEM;
261 uport.flags = UPF_SKIP_TEST | UPF_SHARE_IRQ | UPF_BOOT_AUTOCONF;
262 /* XXX - no interrupt support yet */
264 uport.uartclk = HPAPCI_BAUD_BASE * 16;
265 uport.mapbase = base;
266 uport.membase = (char *)(base + DIO_VIRADDRBASE);
269 line = serial8250_register_port(&uport);
272 printk(KERN_NOTICE "8250_hp300: register_serial() APCI %d"
273 " irq %d failed\n", i, uport.irq);
279 port->next = hp300_ports;
286 /* Any boards found? */
294 static void __devexit hpdca_remove_one(struct dio_dev *d)
298 line = (int) dio_get_drvdata(d);
299 if (d->resource.start) {
300 /* Disable board-interrupts */
301 out_8(d->resource.start + DIO_VIRADDRBASE + DCA_IC, 0);
303 serial8250_unregister_port(line);
307 static void __exit hp300_8250_exit(void)
310 struct hp300_port *port, *to_free;
312 for (port = hp300_ports; port; ) {
313 serial8250_unregister_port(port->line);
322 dio_unregister_driver(&hpdca_driver);
326 module_init(hp300_8250_init);
327 module_exit(hp300_8250_exit);
328 MODULE_DESCRIPTION("HP DCA/APCI serial driver");
329 MODULE_AUTHOR("Kars de Jong <jongk@linux-m68k.org>");
330 MODULE_LICENSE("GPL");