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>
18 #include <linux/slab.h>
23 #if !defined(CONFIG_HPDCA) && !defined(CONFIG_HPAPCI)
24 #warning CONFIG_8250 defined but neither CONFIG_HPDCA nor CONFIG_HPAPCI defined, are you sure?
30 struct hp300_port *next; /* next port */
31 int line; /* line (tty) number */
34 static struct hp300_port *hp300_ports;
39 static int __devinit hpdca_init_one(struct dio_dev *d,
40 const struct dio_device_id *ent);
41 static void __devexit hpdca_remove_one(struct dio_dev *d);
43 static struct dio_device_id hpdca_dio_tbl[] = {
51 static struct dio_driver hpdca_driver = {
53 .id_table = hpdca_dio_tbl,
54 .probe = hpdca_init_one,
55 .remove = __devexit_p(hpdca_remove_one),
60 static unsigned int num_ports;
62 extern int hp300_uart_scode;
64 /* Offset to UART registers from base of DCA */
65 #define UART_OFFSET 17
67 #define DCA_ID 0x01 /* ID (read), reset (write) */
68 #define DCA_IC 0x03 /* Interrupt control */
70 /* Interrupt control */
71 #define DCA_IC_IE 0x80 /* Master interrupt enable */
73 #define HPDCA_BAUD_BASE 153600
75 /* Base address of the Frodo part */
76 #define FRODO_BASE (0x41c000)
79 * Where we find the 8250-like APCI ports, and how far apart they are.
81 #define FRODO_APCIBASE 0x0
82 #define FRODO_APCISPACE 0x20
83 #define FRODO_APCI_OFFSET(x) (FRODO_APCIBASE + ((x) * FRODO_APCISPACE))
85 #define HPAPCI_BAUD_BASE 500400
87 #ifdef CONFIG_SERIAL_8250_CONSOLE
89 * Parse the bootinfo to find descriptions for headless console and
90 * debug serial ports and register them with the 8250 driver.
91 * This function should be called before serial_console_init() is called
92 * to make sure the serial console will be available for use. IA-64 kernel
93 * calls this function from setup_arch() after the EFI and ACPI tables have
96 int __init hp300_setup_serial_console(void)
99 struct uart_port port;
101 memset(&port, 0, sizeof(port));
103 if (hp300_uart_scode < 0 || hp300_uart_scode > DIO_SCMAX)
106 if (DIO_SCINHOLE(hp300_uart_scode))
109 scode = hp300_uart_scode;
111 /* Memory mapped I/O */
112 port.iotype = UPIO_MEM;
113 port.flags = UPF_SKIP_TEST | UPF_SHARE_IRQ | UPF_BOOT_AUTOCONF;
114 port.type = PORT_UNKNOWN;
116 /* Check for APCI console */
119 printk(KERN_INFO "Serial console is HP APCI 1\n");
121 port.uartclk = HPAPCI_BAUD_BASE * 16;
122 port.mapbase = (FRODO_BASE + FRODO_APCI_OFFSET(1));
123 port.membase = (char *)(port.mapbase + DIO_VIRADDRBASE);
125 add_preferred_console("ttyS", port.line, "9600n8");
127 printk(KERN_WARNING "Serial console is APCI but support is disabled (CONFIG_HPAPCI)!\n");
132 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");
150 printk(KERN_WARNING "Serial console is DCA but support is disabled (CONFIG_HPDCA)!\n");
155 if (early_serial_setup(&port) < 0)
156 printk(KERN_WARNING "hp300_setup_serial_console(): early_serial_setup() failed.\n");
159 #endif /* CONFIG_SERIAL_8250_CONSOLE */
162 static int __devinit hpdca_init_one(struct dio_dev *d,
163 const struct dio_device_id *ent)
165 struct uart_port port;
168 #ifdef CONFIG_SERIAL_8250_CONSOLE
169 if (hp300_uart_scode == d->scode) {
170 /* Already got it. */
174 memset(&uart, 0, sizeof(uart));
176 /* Memory mapped I/O */
177 port.iotype = UPIO_MEM;
178 port.flags = UPF_SKIP_TEST | UPF_SHARE_IRQ | UPF_BOOT_AUTOCONF;
180 port.uartclk = HPDCA_BAUD_BASE * 16;
181 port.mapbase = (d->resource.start + UART_OFFSET);
182 port.membase = (char *)(port.mapbase + DIO_VIRADDRBASE);
185 line = serial8250_register_8250_port(&uart);
188 printk(KERN_NOTICE "8250_hp300: register_serial() DCA scode %d"
189 " irq %d failed\n", d->scode, port.irq);
193 /* Enable board-interrupts */
194 out_8(d->resource.start + DIO_VIRADDRBASE + DCA_IC, DCA_IC_IE);
195 dio_set_drvdata(d, (void *)line);
198 out_8(d->resource.start + DIO_VIRADDRBASE + DCA_ID, 0xff);
207 static int __init hp300_8250_init(void)
213 struct uart_8250_port uart;
214 struct hp300_port *port;
225 dio_register_driver(&hpdca_driver);
228 if (hp300_model < HP_400) {
233 /* These models have the Frodo chip.
234 * Port 0 is reserved for the Apollo Domain keyboard.
235 * Port 1 is either the console or the DCA.
237 for (i = 1; i < 4; i++) {
238 /* Port 1 is the console on a 425e, on other machines it's
241 #ifdef CONFIG_SERIAL_8250_CONSOLE
246 /* Create new serial device */
247 port = kmalloc(sizeof(struct hp300_port), GFP_KERNEL);
251 memset(&uart, 0, sizeof(uart));
253 base = (FRODO_BASE + FRODO_APCI_OFFSET(i));
255 /* Memory mapped I/O */
256 uart.port.iotype = UPIO_MEM;
257 uart.port.flags = UPF_SKIP_TEST | UPF_SHARE_IRQ \
259 /* XXX - no interrupt support yet */
261 uart.port.uartclk = HPAPCI_BAUD_BASE * 16;
262 uart.port.mapbase = base;
263 uart.port.membase = (char *)(base + DIO_VIRADDRBASE);
264 uart.port.regshift = 2;
266 line = serial8250_register_8250_port(&uart);
269 printk(KERN_NOTICE "8250_hp300: register_serial() APCI"
270 " %d irq %d failed\n", i, uart.port.irq);
276 port->next = hp300_ports;
283 /* Any boards found? */
291 static void __devexit hpdca_remove_one(struct dio_dev *d)
295 line = (int) dio_get_drvdata(d);
296 if (d->resource.start) {
297 /* Disable board-interrupts */
298 out_8(d->resource.start + DIO_VIRADDRBASE + DCA_IC, 0);
300 serial8250_unregister_port(line);
304 static void __exit hp300_8250_exit(void)
307 struct hp300_port *port, *to_free;
309 for (port = hp300_ports; port; ) {
310 serial8250_unregister_port(port->line);
319 dio_unregister_driver(&hpdca_driver);
323 module_init(hp300_8250_init);
324 module_exit(hp300_8250_exit);
325 MODULE_DESCRIPTION("HP DCA/APCI serial driver");
326 MODULE_AUTHOR("Kars de Jong <jongk@linux-m68k.org>");
327 MODULE_LICENSE("GPL");