606c958e28
For the simulator, fake a slow clock to get fast output. In prom_putchar we have to mask the value so the simulator doesn't ASSERT when printing non-ASCII characters. Signed-off-by: David Daney <ddaney@caviumnetworks.com> To: linux-mips@linux-mips.org Patchwork: http://patchwork.linux-mips.org/patch/1255/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
141 lines
3.6 KiB
C
141 lines
3.6 KiB
C
/*
|
|
* This file is subject to the terms and conditions of the GNU General Public
|
|
* License. See the file "COPYING" in the main directory of this archive
|
|
* for more details.
|
|
*
|
|
* Copyright (C) 2004-2007 Cavium Networks
|
|
*/
|
|
#include <linux/console.h>
|
|
#include <linux/module.h>
|
|
#include <linux/init.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/serial.h>
|
|
#include <linux/serial_8250.h>
|
|
#include <linux/serial_reg.h>
|
|
#include <linux/tty.h>
|
|
|
|
#include <asm/time.h>
|
|
|
|
#include <asm/octeon/octeon.h>
|
|
|
|
#ifdef CONFIG_GDB_CONSOLE
|
|
#define DEBUG_UART 0
|
|
#else
|
|
#define DEBUG_UART 1
|
|
#endif
|
|
|
|
unsigned int octeon_serial_in(struct uart_port *up, int offset)
|
|
{
|
|
int rv = cvmx_read_csr((uint64_t)(up->membase + (offset << 3)));
|
|
if (offset == UART_IIR && (rv & 0xf) == 7) {
|
|
/* Busy interrupt, read the USR (39) and try again. */
|
|
cvmx_read_csr((uint64_t)(up->membase + (39 << 3)));
|
|
rv = cvmx_read_csr((uint64_t)(up->membase + (offset << 3)));
|
|
}
|
|
return rv;
|
|
}
|
|
|
|
void octeon_serial_out(struct uart_port *up, int offset, int value)
|
|
{
|
|
/*
|
|
* If bits 6 or 7 of the OCTEON UART's LCR are set, it quits
|
|
* working.
|
|
*/
|
|
if (offset == UART_LCR)
|
|
value &= 0x9f;
|
|
cvmx_write_csr((uint64_t)(up->membase + (offset << 3)), (u8)value);
|
|
}
|
|
|
|
/*
|
|
* Allocated in .bss, so it is all zeroed.
|
|
*/
|
|
#define OCTEON_MAX_UARTS 3
|
|
static struct plat_serial8250_port octeon_uart8250_data[OCTEON_MAX_UARTS + 1];
|
|
static struct platform_device octeon_uart8250_device = {
|
|
.name = "serial8250",
|
|
.id = PLAT8250_DEV_PLATFORM,
|
|
.dev = {
|
|
.platform_data = octeon_uart8250_data,
|
|
},
|
|
};
|
|
|
|
static void __init octeon_uart_set_common(struct plat_serial8250_port *p)
|
|
{
|
|
p->flags = ASYNC_SKIP_TEST | UPF_SHARE_IRQ | UPF_FIXED_TYPE;
|
|
p->type = PORT_OCTEON;
|
|
p->iotype = UPIO_MEM;
|
|
p->regshift = 3; /* I/O addresses are every 8 bytes */
|
|
if (octeon_is_simulation())
|
|
/* Make simulator output fast*/
|
|
p->uartclk = 115200 * 16;
|
|
else
|
|
p->uartclk = mips_hpt_frequency;
|
|
p->serial_in = octeon_serial_in;
|
|
p->serial_out = octeon_serial_out;
|
|
}
|
|
|
|
static int __init octeon_serial_init(void)
|
|
{
|
|
int enable_uart0;
|
|
int enable_uart1;
|
|
int enable_uart2;
|
|
struct plat_serial8250_port *p;
|
|
|
|
#ifdef CONFIG_CAVIUM_OCTEON_2ND_KERNEL
|
|
/*
|
|
* If we are configured to run as the second of two kernels,
|
|
* disable uart0 and enable uart1. Uart0 is owned by the first
|
|
* kernel
|
|
*/
|
|
enable_uart0 = 0;
|
|
enable_uart1 = 1;
|
|
#else
|
|
/*
|
|
* We are configured for the first kernel. We'll enable uart0
|
|
* if the bootloader told us to use 0, otherwise will enable
|
|
* uart 1.
|
|
*/
|
|
enable_uart0 = (octeon_get_boot_uart() == 0);
|
|
enable_uart1 = (octeon_get_boot_uart() == 1);
|
|
#ifdef CONFIG_KGDB
|
|
enable_uart1 = 1;
|
|
#endif
|
|
#endif
|
|
|
|
/* Right now CN52XX is the only chip with a third uart */
|
|
enable_uart2 = OCTEON_IS_MODEL(OCTEON_CN52XX);
|
|
|
|
p = octeon_uart8250_data;
|
|
if (enable_uart0) {
|
|
/* Add a ttyS device for hardware uart 0 */
|
|
octeon_uart_set_common(p);
|
|
p->membase = (void *) CVMX_MIO_UARTX_RBR(0);
|
|
p->mapbase = CVMX_MIO_UARTX_RBR(0) & ((1ull << 49) - 1);
|
|
p->irq = OCTEON_IRQ_UART0;
|
|
p++;
|
|
}
|
|
|
|
if (enable_uart1) {
|
|
/* Add a ttyS device for hardware uart 1 */
|
|
octeon_uart_set_common(p);
|
|
p->membase = (void *) CVMX_MIO_UARTX_RBR(1);
|
|
p->mapbase = CVMX_MIO_UARTX_RBR(1) & ((1ull << 49) - 1);
|
|
p->irq = OCTEON_IRQ_UART1;
|
|
p++;
|
|
}
|
|
if (enable_uart2) {
|
|
/* Add a ttyS device for hardware uart 2 */
|
|
octeon_uart_set_common(p);
|
|
p->membase = (void *) CVMX_MIO_UART2_RBR;
|
|
p->mapbase = CVMX_MIO_UART2_RBR & ((1ull << 49) - 1);
|
|
p->irq = OCTEON_IRQ_UART2;
|
|
p++;
|
|
}
|
|
|
|
BUG_ON(p > &octeon_uart8250_data[OCTEON_MAX_UARTS]);
|
|
|
|
return platform_device_register(&octeon_uart8250_device);
|
|
}
|
|
|
|
device_initcall(octeon_serial_init);
|