| /* |
| * Driver for the 98626/98644/internal serial interface on hp300/hp400 |
| * (based on the National Semiconductor INS8250/NS16550AF/WD16C552 UARTs) |
| * |
| * Ported from 2.2 and modified to use the normal 8250 driver |
| * by Kars de Jong <jongk@linux-m68k.org>, May 2004. |
| */ |
| #include <linux/module.h> |
| #include <linux/init.h> |
| #include <linux/string.h> |
| #include <linux/kernel.h> |
| #include <linux/serial.h> |
| #include <linux/serial_core.h> |
| #include <linux/delay.h> |
| #include <linux/dio.h> |
| #include <linux/console.h> |
| #include <asm/io.h> |
| |
| #include "8250.h" |
| |
| #if !defined(CONFIG_HPDCA) && !defined(CONFIG_HPAPCI) |
| #warning CONFIG_8250 defined but neither CONFIG_HPDCA nor CONFIG_HPAPCI defined, are you sure? |
| #endif |
| |
| #ifdef CONFIG_HPAPCI |
| struct hp300_port |
| { |
| struct hp300_port *next; /* next port */ |
| int line; /* line (tty) number */ |
| }; |
| |
| static struct hp300_port *hp300_ports; |
| #endif |
| |
| #ifdef CONFIG_HPDCA |
| |
| static int __devinit hpdca_init_one(struct dio_dev *d, |
| const struct dio_device_id *ent); |
| static void __devexit hpdca_remove_one(struct dio_dev *d); |
| |
| static struct dio_device_id hpdca_dio_tbl[] = { |
| { DIO_ID_DCA0 }, |
| { DIO_ID_DCA0REM }, |
| { DIO_ID_DCA1 }, |
| { DIO_ID_DCA1REM }, |
| { 0 } |
| }; |
| |
| static struct dio_driver hpdca_driver = { |
| .name = "hpdca", |
| .id_table = hpdca_dio_tbl, |
| .probe = hpdca_init_one, |
| .remove = __devexit_p(hpdca_remove_one), |
| }; |
| |
| #endif |
| |
| extern int hp300_uart_scode; |
| |
| /* Offset to UART registers from base of DCA */ |
| #define UART_OFFSET 17 |
| |
| #define DCA_ID 0x01 /* ID (read), reset (write) */ |
| #define DCA_IC 0x03 /* Interrupt control */ |
| |
| /* Interrupt control */ |
| #define DCA_IC_IE 0x80 /* Master interrupt enable */ |
| |
| #define HPDCA_BAUD_BASE 153600 |
| |
| /* Base address of the Frodo part */ |
| #define FRODO_BASE (0x41c000) |
| |
| /* |
| * Where we find the 8250-like APCI ports, and how far apart they are. |
| */ |
| #define FRODO_APCIBASE 0x0 |
| #define FRODO_APCISPACE 0x20 |
| #define FRODO_APCI_OFFSET(x) (FRODO_APCIBASE + ((x) * FRODO_APCISPACE)) |
| |
| #define HPAPCI_BAUD_BASE 500400 |
| |
| #ifdef CONFIG_SERIAL_8250_CONSOLE |
| /* |
| * Parse the bootinfo to find descriptions for headless console and |
| * debug serial ports and register them with the 8250 driver. |
| * This function should be called before serial_console_init() is called |
| * to make sure the serial console will be available for use. IA-64 kernel |
| * calls this function from setup_arch() after the EFI and ACPI tables have |
| * been parsed. |
| */ |
| int __init hp300_setup_serial_console(void) |
| { |
| int scode; |
| struct uart_port port; |
| |
| memset(&port, 0, sizeof(port)); |
| |
| if (hp300_uart_scode < 0 || hp300_uart_scode > DIO_SCMAX) |
| return 0; |
| |
| if (DIO_SCINHOLE(hp300_uart_scode)) |
| return 0; |
| |
| scode = hp300_uart_scode; |
| |
| /* Memory mapped I/O */ |
| port.iotype = UPIO_MEM; |
| port.flags = UPF_SKIP_TEST | UPF_SHARE_IRQ | UPF_BOOT_AUTOCONF; |
| port.type = PORT_UNKNOWN; |
| |
| /* Check for APCI console */ |
| if (scode == 256) { |
| #ifdef CONFIG_HPAPCI |
| printk(KERN_INFO "Serial console is HP APCI 1\n"); |
| |
| port.uartclk = HPAPCI_BAUD_BASE * 16; |
| port.mapbase = (FRODO_BASE + FRODO_APCI_OFFSET(1)); |
| port.membase = (char *)(port.mapbase + DIO_VIRADDRBASE); |
| port.regshift = 2; |
| add_preferred_console("ttyS", port.line, "9600n8"); |
| #else |
| printk(KERN_WARNING "Serial console is APCI but support is disabled (CONFIG_HPAPCI)!\n"); |
| return 0; |
| #endif |
| } |
| else { |
| #ifdef CONFIG_HPDCA |
| unsigned long pa = dio_scodetophysaddr(scode); |
| if (!pa) { |
| return 0; |
| } |
| |
| printk(KERN_INFO "Serial console is HP DCA at select code %d\n", scode); |
| |
| port.uartclk = HPDCA_BAUD_BASE * 16; |
| port.mapbase = (pa + UART_OFFSET); |
| port.membase = (char *)(port.mapbase + DIO_VIRADDRBASE); |
| port.regshift = 1; |
| port.irq = DIO_IPL(pa + DIO_VIRADDRBASE); |
| |
| /* Enable board-interrupts */ |
| out_8(pa + DIO_VIRADDRBASE + DCA_IC, DCA_IC_IE); |
| |
| if (DIO_ID(pa + DIO_VIRADDRBASE) & 0x80) { |
| add_preferred_console("ttyS", port.line, "9600n8"); |
| } |
| #else |
| printk(KERN_WARNING "Serial console is DCA but support is disabled (CONFIG_HPDCA)!\n"); |
| return 0; |
| #endif |
| } |
| |
| if (early_serial_setup(&port) < 0) { |
| printk(KERN_WARNING "hp300_setup_serial_console(): early_serial_setup() failed.\n"); |
| } |
| |
| return 0; |
| } |
| #endif /* CONFIG_SERIAL_8250_CONSOLE */ |
| |
| #ifdef CONFIG_HPDCA |
| static int __devinit hpdca_init_one(struct dio_dev *d, |
| const struct dio_device_id *ent) |
| { |
| struct uart_port port; |
| int line; |
| |
| #ifdef CONFIG_SERIAL_8250_CONSOLE |
| if (hp300_uart_scode == d->scode) { |
| /* Already got it. */ |
| return 0; |
| } |
| #endif |
| memset(&port, 0, sizeof(struct uart_port)); |
| |
| /* Memory mapped I/O */ |
| port.iotype = UPIO_MEM; |
| port.flags = UPF_SKIP_TEST | UPF_SHARE_IRQ | UPF_BOOT_AUTOCONF; |
| port.irq = d->ipl; |
| port.uartclk = HPDCA_BAUD_BASE * 16; |
| port.mapbase = (d->resource.start + UART_OFFSET); |
| port.membase = (char *)(port.mapbase + DIO_VIRADDRBASE); |
| port.regshift = 1; |
| port.dev = &d->dev; |
| line = serial8250_register_port(&port); |
| |
| if (line < 0) { |
| printk(KERN_NOTICE "8250_hp300: register_serial() DCA scode %d" |
| " irq %d failed\n", d->scode, port.irq); |
| return -ENOMEM; |
| } |
| |
| /* Enable board-interrupts */ |
| out_8(d->resource.start + DIO_VIRADDRBASE + DCA_IC, DCA_IC_IE); |
| dio_set_drvdata(d, (void *)line); |
| |
| /* Reset the DCA */ |
| out_8(d->resource.start + DIO_VIRADDRBASE + DCA_ID, 0xff); |
| udelay(100); |
| |
| return 0; |
| } |
| #endif |
| |
| static int __init hp300_8250_init(void) |
| { |
| static int called = 0; |
| int num_ports; |
| #ifdef CONFIG_HPAPCI |
| int line; |
| unsigned long base; |
| struct uart_port uport; |
| struct hp300_port *port; |
| int i; |
| #endif |
| if (called) |
| return -ENODEV; |
| called = 1; |
| |
| if (!MACH_IS_HP300) |
| return -ENODEV; |
| |
| num_ports = 0; |
| |
| #ifdef CONFIG_HPDCA |
| if (dio_module_init(&hpdca_driver) == 0) |
| num_ports++; |
| #endif |
| #ifdef CONFIG_HPAPCI |
| if (hp300_model < HP_400) { |
| if (!num_ports) |
| return -ENODEV; |
| return 0; |
| } |
| /* These models have the Frodo chip. |
| * Port 0 is reserved for the Apollo Domain keyboard. |
| * Port 1 is either the console or the DCA. |
| */ |
| for (i = 1; i < 4; i++) { |
| /* Port 1 is the console on a 425e, on other machines it's mapped to |
| * DCA. |
| */ |
| #ifdef CONFIG_SERIAL_8250_CONSOLE |
| if (i == 1) { |
| continue; |
| } |
| #endif |
| |
| /* Create new serial device */ |
| port = kmalloc(sizeof(struct hp300_port), GFP_KERNEL); |
| if (!port) |
| return -ENOMEM; |
| |
| memset(&uport, 0, sizeof(struct uart_port)); |
| |
| base = (FRODO_BASE + FRODO_APCI_OFFSET(i)); |
| |
| /* Memory mapped I/O */ |
| uport.iotype = UPIO_MEM; |
| uport.flags = UPF_SKIP_TEST | UPF_SHARE_IRQ | UPF_BOOT_AUTOCONF; |
| /* XXX - no interrupt support yet */ |
| uport.irq = 0; |
| uport.uartclk = HPAPCI_BAUD_BASE * 16; |
| uport.mapbase = base; |
| uport.membase = (char *)(base + DIO_VIRADDRBASE); |
| uport.regshift = 2; |
| |
| line = serial8250_register_port(&uport); |
| |
| if (line < 0) { |
| printk(KERN_NOTICE "8250_hp300: register_serial() APCI %d" |
| " irq %d failed\n", i, uport.irq); |
| kfree(port); |
| continue; |
| } |
| |
| port->line = line; |
| port->next = hp300_ports; |
| hp300_ports = port; |
| |
| num_ports++; |
| } |
| #endif |
| |
| /* Any boards found? */ |
| if (!num_ports) |
| return -ENODEV; |
| |
| return 0; |
| } |
| |
| #ifdef CONFIG_HPDCA |
| static void __devexit hpdca_remove_one(struct dio_dev *d) |
| { |
| int line; |
| |
| line = (int) dio_get_drvdata(d); |
| if (d->resource.start) { |
| /* Disable board-interrupts */ |
| out_8(d->resource.start + DIO_VIRADDRBASE + DCA_IC, 0); |
| } |
| serial8250_unregister_port(line); |
| } |
| #endif |
| |
| static void __exit hp300_8250_exit(void) |
| { |
| #ifdef CONFIG_HPAPCI |
| struct hp300_port *port, *to_free; |
| |
| for (port = hp300_ports; port; ) { |
| serial8250_unregister_port(port->line); |
| to_free = port; |
| port = port->next; |
| kfree(to_free); |
| } |
| |
| hp300_ports = NULL; |
| #endif |
| #ifdef CONFIG_HPDCA |
| dio_unregister_driver(&hpdca_driver); |
| #endif |
| } |
| |
| module_init(hp300_8250_init); |
| module_exit(hp300_8250_exit); |
| MODULE_DESCRIPTION("HP DCA/APCI serial driver"); |
| MODULE_AUTHOR("Kars de Jong <jongk@linux-m68k.org>"); |
| MODULE_LICENSE("GPL"); |