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/serial_8250.h>
15 #include <linux/delay.h>
16 #include <linux/dio.h>
17 #include <linux/console.h>
22 #if !defined(CONFIG_HPDCA) && !defined(CONFIG_HPAPCI)
23 #warning CONFIG_8250 defined but neither CONFIG_HPDCA nor CONFIG_HPAPCI defined, are you sure?
29 struct hp300_port *next; /* next port */
30 int line; /* line (tty) number */
33 static struct hp300_port *hp300_ports;
38 static int __devinit hpdca_init_one(struct dio_dev *d,
39 const struct dio_device_id *ent);
40 static void __devexit hpdca_remove_one(struct dio_dev *d);
42 static struct dio_device_id hpdca_dio_tbl[] = {
50 static struct dio_driver hpdca_driver = {
52 .id_table = hpdca_dio_tbl,
53 .probe = hpdca_init_one,
54 .remove = __devexit_p(hpdca_remove_one),
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)
78 * Where we find the 8250-like APCI ports, and how far apart they are.
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
88 * Parse the bootinfo to find descriptions for headless console and
89 * debug serial ports and register them with the 8250 driver.
90 * This function should be called before serial_console_init() is called
91 * to make sure the serial console will be available for use. IA-64 kernel
92 * calls this function from setup_arch() after the EFI and ACPI tables have
95 int __init hp300_setup_serial_console(void)
98 struct uart_port port;
100 memset(&port, 0, sizeof(port));
102 if (hp300_uart_scode < 0 || hp300_uart_scode > DIO_SCMAX)
105 if (DIO_SCINHOLE(hp300_uart_scode))
108 scode = hp300_uart_scode;
110 /* Memory mapped I/O */
111 port.iotype = UPIO_MEM;
112 port.flags = UPF_SKIP_TEST | UPF_SHARE_IRQ | UPF_BOOT_AUTOCONF;
113 port.type = PORT_UNKNOWN;
115 /* Check for APCI console */
118 printk(KERN_INFO "Serial console is HP APCI 1\n");
120 port.uartclk = HPAPCI_BAUD_BASE * 16;
121 port.mapbase = (FRODO_BASE + FRODO_APCI_OFFSET(1));
122 port.membase = (char *)(port.mapbase + DIO_VIRADDRBASE);
124 add_preferred_console("ttyS", port.line, "9600n8");
126 printk(KERN_WARNING "Serial console is APCI but support is disabled (CONFIG_HPAPCI)!\n");
131 unsigned long pa = dio_scodetophysaddr(scode);
135 printk(KERN_INFO "Serial console is HP DCA at select code %d\n", scode);
137 port.uartclk = HPDCA_BAUD_BASE * 16;
138 port.mapbase = (pa + UART_OFFSET);
139 port.membase = (char *)(port.mapbase + DIO_VIRADDRBASE);
141 port.irq = DIO_IPL(pa + DIO_VIRADDRBASE);
143 /* Enable board-interrupts */
144 out_8(pa + DIO_VIRADDRBASE + DCA_IC, DCA_IC_IE);
146 if (DIO_ID(pa + DIO_VIRADDRBASE) & 0x80)
147 add_preferred_console("ttyS", port.line, "9600n8");
149 printk(KERN_WARNING "Serial console is DCA but support is disabled (CONFIG_HPDCA)!\n");
154 if (early_serial_setup(&port) < 0)
155 printk(KERN_WARNING "hp300_setup_serial_console(): early_serial_setup() failed.\n");
158 #endif /* CONFIG_SERIAL_8250_CONSOLE */
161 static int __devinit hpdca_init_one(struct dio_dev *d,
162 const struct dio_device_id *ent)
164 struct uart_port port;
167 #ifdef CONFIG_SERIAL_8250_CONSOLE
168 if (hp300_uart_scode == d->scode) {
169 /* Already got it. */
173 memset(&port, 0, sizeof(struct uart_port));
175 /* Memory mapped I/O */
176 port.iotype = UPIO_MEM;
177 port.flags = UPF_SKIP_TEST | UPF_SHARE_IRQ | UPF_BOOT_AUTOCONF;
179 port.uartclk = HPDCA_BAUD_BASE * 16;
180 port.mapbase = (d->resource.start + UART_OFFSET);
181 port.membase = (char *)(port.mapbase + DIO_VIRADDRBASE);
184 line = serial8250_register_port(&port);
187 printk(KERN_NOTICE "8250_hp300: register_serial() DCA scode %d"
188 " irq %d failed\n", d->scode, port.irq);
192 /* Enable board-interrupts */
193 out_8(d->resource.start + DIO_VIRADDRBASE + DCA_IC, DCA_IC_IE);
194 dio_set_drvdata(d, (void *)line);
197 out_8(d->resource.start + DIO_VIRADDRBASE + DCA_ID, 0xff);
206 static int __init hp300_8250_init(void)
212 struct uart_port uport;
213 struct hp300_port *port;
224 dio_register_driver(&hpdca_driver);
227 if (hp300_model < HP_400) {
232 /* These models have the Frodo chip.
233 * Port 0 is reserved for the Apollo Domain keyboard.
234 * Port 1 is either the console or the DCA.
236 for (i = 1; i < 4; i++) {
237 /* Port 1 is the console on a 425e, on other machines it's
240 #ifdef CONFIG_SERIAL_8250_CONSOLE
245 /* Create new serial device */
246 port = kmalloc(sizeof(struct hp300_port), GFP_KERNEL);
250 memset(&uport, 0, sizeof(struct uart_port));
252 base = (FRODO_BASE + FRODO_APCI_OFFSET(i));
254 /* Memory mapped I/O */
255 uport.iotype = UPIO_MEM;
256 uport.flags = UPF_SKIP_TEST | UPF_SHARE_IRQ \
258 /* XXX - no interrupt support yet */
260 uport.uartclk = HPAPCI_BAUD_BASE * 16;
261 uport.mapbase = base;
262 uport.membase = (char *)(base + DIO_VIRADDRBASE);
265 line = serial8250_register_port(&uport);
268 printk(KERN_NOTICE "8250_hp300: register_serial() APCI"
269 " %d irq %d failed\n", i, uport.irq);
275 port->next = hp300_ports;
282 /* Any boards found? */
290 static void __devexit hpdca_remove_one(struct dio_dev *d)
294 line = (int) dio_get_drvdata(d);
295 if (d->resource.start) {
296 /* Disable board-interrupts */
297 out_8(d->resource.start + DIO_VIRADDRBASE + DCA_IC, 0);
299 serial8250_unregister_port(line);
303 static void __exit hp300_8250_exit(void)
306 struct hp300_port *port, *to_free;
308 for (port = hp300_ports; port; ) {
309 serial8250_unregister_port(port->line);
318 dio_unregister_driver(&hpdca_driver);
322 module_init(hp300_8250_init);
323 module_exit(hp300_8250_exit);
324 MODULE_DESCRIPTION("HP DCA/APCI serial driver");
325 MODULE_AUTHOR("Kars de Jong <jongk@linux-m68k.org>");
326 MODULE_LICENSE("GPL");