linux/drivers/tty/serial/8250/8250_hp300.c
Paul Gortmaker f99b63afb9 serial: hp300: mask the warning for people just doing build coverage
Currently this warning is triggered for allmodconfig on m68k.  It is
well intentioned, in that if you are building the driver but not
enabling one of the platforms where the hardware exists, you get a
warning.

The warning dates back to pre-git days, and now we have COMPILE_TEST
so we can use that to mask the warning for people who are obviously
just doing build coverage on tree wide changes.

Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jiri Slaby <jslaby@suse.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: linux-m68k@lists.linux-m68k.org
Cc: linux-serial@vger.kernel.org
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-01-25 11:08:30 +01:00

324 lines
7.4 KiB
C

/*
* 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_8250.h>
#include <linux/delay.h>
#include <linux/dio.h>
#include <linux/console.h>
#include <linux/slab.h>
#include <asm/io.h>
#include "8250.h"
#if !defined(CONFIG_HPDCA) && !defined(CONFIG_HPAPCI) && !defined(CONFIG_COMPILE_TEST)
#warning CONFIG_SERIAL_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 hpdca_init_one(struct dio_dev *d,
const struct dio_device_id *ent);
static void 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 = hpdca_remove_one,
};
#endif
static unsigned int num_ports;
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.
*/
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
pr_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
pr_warn("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;
pr_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
pr_warn("Serial console is DCA but support is disabled (CONFIG_HPDCA)!\n");
return 0;
#endif
}
if (early_serial_setup(&port) < 0)
pr_warn("%s: early_serial_setup() failed.\n", __func__);
return 0;
}
#endif /* CONFIG_SERIAL_8250_CONSOLE */
#ifdef CONFIG_HPDCA
static int hpdca_init_one(struct dio_dev *d,
const struct dio_device_id *ent)
{
struct uart_8250_port uart;
int line;
#ifdef CONFIG_SERIAL_8250_CONSOLE
if (hp300_uart_scode == d->scode) {
/* Already got it. */
return 0;
}
#endif
memset(&uart, 0, sizeof(uart));
/* Memory mapped I/O */
uart.port.iotype = UPIO_MEM;
uart.port.flags = UPF_SKIP_TEST | UPF_SHARE_IRQ | UPF_BOOT_AUTOCONF;
uart.port.irq = d->ipl;
uart.port.uartclk = HPDCA_BAUD_BASE * 16;
uart.port.mapbase = (d->resource.start + UART_OFFSET);
uart.port.membase = (char *)(uart.port.mapbase + DIO_VIRADDRBASE);
uart.port.regshift = 1;
uart.port.dev = &d->dev;
line = serial8250_register_8250_port(&uart);
if (line < 0) {
dev_notice(&d->dev,
"8250_hp300: register_serial() DCA scode %d irq %d failed\n",
d->scode, uart.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);
num_ports++;
return 0;
}
#endif
static int __init hp300_8250_init(void)
{
static int called;
#ifdef CONFIG_HPAPCI
int line;
unsigned long base;
struct uart_8250_port uart;
struct hp300_port *port;
int i;
#endif
if (called)
return -ENODEV;
called = 1;
if (!MACH_IS_HP300)
return -ENODEV;
#ifdef CONFIG_HPDCA
dio_register_driver(&hpdca_driver);
#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(&uart, 0, sizeof(uart));
base = (FRODO_BASE + FRODO_APCI_OFFSET(i));
/* Memory mapped I/O */
uart.port.iotype = UPIO_MEM;
uart.port.flags = UPF_SKIP_TEST | UPF_SHARE_IRQ
| UPF_BOOT_AUTOCONF;
/* XXX - no interrupt support yet */
uart.port.irq = 0;
uart.port.uartclk = HPAPCI_BAUD_BASE * 16;
uart.port.mapbase = base;
uart.port.membase = (char *)(base + DIO_VIRADDRBASE);
uart.port.regshift = 2;
line = serial8250_register_8250_port(&uart);
if (line < 0) {
dev_notice(uart.port.dev,
"8250_hp300: register_serial() APCI %d irq %d failed\n",
i, uart.port.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 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");