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Commit 52e15f0e authored by Sonic Zhang's avatar Sonic Zhang Committed by Linus Torvalds
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Blackfin Serial Driver: updates kgdb over Blackfin serial driver with kgdb framework 



Signed-off-by: default avatarSonic Zhang <sonic.zhang@analog.com>
Signed-off-by: default avatarBryan Wu <cooloney@kernel.org>
Signed-off-by: default avatarAlan Cox <alan@redhat.com>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent b58602a4

drivers/serial/bfin_5xx.c

+89 −98
Original line number Diff line number Diff line
@@ -22,7 +22,8 @@ 
#include <linux/tty_flip.h>

#include <linux/serial_core.h>



#ifdef CONFIG_KGDB_UART

#if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \

	defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)

#include <linux/kgdb.h>

#include <asm/irq_regs.h>

#endif
@@ -45,6 +46,16 @@ 
static struct bfin_serial_port bfin_serial_ports[BFIN_UART_NR_PORTS];

static int nr_active_ports = ARRAY_SIZE(bfin_serial_resource);



#if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \

	defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)



# ifndef CONFIG_SERIAL_BFIN_PIO

#  error KGDB only support UART in PIO mode.

# endif



static int kgdboc_port_line;

static int kgdboc_break_enabled;

#endif

/*

 * Setup for console. Argument comes from the menuconfig

 */
@@ -110,9 +121,7 @@ static void bfin_serial_start_tx(struct uart_port *port) 
static void bfin_serial_stop_rx(struct uart_port *port)

{

	struct bfin_serial_port *uart = (struct bfin_serial_port *)port;

#ifdef CONFIG_KGDB_UART

	if (uart->port.line != CONFIG_KGDB_UART_PORT)

#endif



	UART_CLEAR_IER(uart, ERBFI);

}
@@ -123,49 +132,6 @@ static void bfin_serial_enable_ms(struct uart_port *port) 
{

}



#ifdef CONFIG_KGDB_UART

static int kgdb_entry_state;



void kgdb_put_debug_char(int chr)

{

	struct bfin_serial_port *uart;



	if (CONFIG_KGDB_UART_PORT < 0

		|| CONFIG_KGDB_UART_PORT >= BFIN_UART_NR_PORTS)

		uart = &bfin_serial_ports[0];

	else

		uart = &bfin_serial_ports[CONFIG_KGDB_UART_PORT];



	while (!(UART_GET_LSR(uart) & THRE)) {

		SSYNC();

	}



	UART_CLEAR_DLAB(uart);

	UART_PUT_CHAR(uart, (unsigned char)chr);

	SSYNC();

}



int kgdb_get_debug_char(void)

{

	struct bfin_serial_port *uart;

	unsigned char chr;



	if (CONFIG_KGDB_UART_PORT < 0

		|| CONFIG_KGDB_UART_PORT >= BFIN_UART_NR_PORTS)

		uart = &bfin_serial_ports[0];

	else

		uart = &bfin_serial_ports[CONFIG_KGDB_UART_PORT];



	while(!(UART_GET_LSR(uart) & DR)) {

		SSYNC();

	}

	UART_CLEAR_DLAB(uart);

	chr = UART_GET_CHAR(uart);

	SSYNC();



	return chr;

}

#endif



#if ANOMALY_05000363 && defined(CONFIG_SERIAL_BFIN_PIO)

# define UART_GET_ANOMALY_THRESHOLD(uart)    ((uart)->anomaly_threshold)
@@ -178,7 +144,7 @@ int kgdb_get_debug_char(void) 
#ifdef CONFIG_SERIAL_BFIN_PIO

static void bfin_serial_rx_chars(struct bfin_serial_port *uart)

{

	struct tty_struct *tty = uart->port.info->port.tty;

	struct tty_struct *tty = NULL;

	unsigned int status, ch, flg;

	static struct timeval anomaly_start = { .tv_sec = 0 };
@@ -188,27 +154,18 @@ static void bfin_serial_rx_chars(struct bfin_serial_port *uart) 
 	ch = UART_GET_CHAR(uart);

 	uart->port.icount.rx++;



#ifdef CONFIG_KGDB_UART

	if (uart->port.line == CONFIG_KGDB_UART_PORT) {

		struct pt_regs *regs = get_irq_regs();

		if (uart->port.cons->index == CONFIG_KGDB_UART_PORT && ch == 0x1) { /* Ctrl + A */

			kgdb_breakkey_pressed(regs);

#if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \

	defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)

	if (kgdb_connected && kgdboc_port_line == uart->port.line)

		if (ch == 0x3) {/* Ctrl + C */

			kgdb_breakpoint();

			return;

		} else if (kgdb_entry_state == 0 && ch == '$') {/* connection from KGDB */

			kgdb_entry_state = 1;

		} else if (kgdb_entry_state == 1 && ch == 'q') {

			kgdb_entry_state = 0;

			kgdb_breakkey_pressed(regs);

			return;

		} else if (ch == 0x3) {/* Ctrl + C */

			kgdb_entry_state = 0;

			kgdb_breakkey_pressed(regs);

			return;

		} else {

			kgdb_entry_state = 0;

		}

		}



	if (!uart->port.info || !uart->port.info->tty)

		return;

#endif

	tty = uart->port.info->tty;



	if (ANOMALY_05000363) {

		/* The BF533 (and BF561) family of processors have a nice anomaly
@@ -630,16 +587,16 @@ static int bfin_serial_startup(struct uart_port *port) 
	uart->rx_dma_timer.expires = jiffies + DMA_RX_FLUSH_JIFFIES;

	add_timer(&(uart->rx_dma_timer));

#else

#if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \

	defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)

	if (kgdboc_port_line == uart->port.line && kgdboc_break_enabled)

		kgdboc_break_enabled = 0;

	else {

# endif

	if (request_irq(uart->port.irq, bfin_serial_rx_int, IRQF_DISABLED,

	     "BFIN_UART_RX", uart)) {

# ifdef	CONFIG_KGDB_UART

		if (uart->port.line != CONFIG_KGDB_UART_PORT) {

# endif

		printk(KERN_NOTICE "Unable to attach BlackFin UART RX interrupt\n");

		return -EBUSY;

# ifdef	CONFIG_KGDB_UART

		}

# endif

	}



	if (request_irq
@@ -685,6 +642,10 @@ static int bfin_serial_startup(struct uart_port *port) 
		}

	}

# endif

#if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \

	defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)

	}

# endif

#endif

	UART_SET_IER(uart, ERBFI);

	return 0;
@@ -715,9 +676,6 @@ static void bfin_serial_shutdown(struct uart_port *port) 
	default:

		break;

	};

#endif

#ifdef	CONFIG_KGDB_UART

	if (uart->port.line != CONFIG_KGDB_UART_PORT)

#endif

	free_irq(uart->port.irq, uart);

	free_irq(uart->port.irq+1, uart);
@@ -887,6 +845,51 @@ static void bfin_serial_set_ldisc(struct uart_port *port) 
	}

}



#ifdef CONFIG_CONSOLE_POLL

static void bfin_serial_poll_put_char(struct uart_port *port, unsigned char chr)

{

	struct bfin_serial_port *uart = (struct bfin_serial_port *)port;



	while (!(UART_GET_LSR(uart) & THRE))

		cpu_relax();



	UART_CLEAR_DLAB(uart);

	UART_PUT_CHAR(uart, (unsigned char)chr);

}



static int bfin_serial_poll_get_char(struct uart_port *port)

{

	struct bfin_serial_port *uart = (struct bfin_serial_port *)port;

	unsigned char chr;



	while (!(UART_GET_LSR(uart) & DR))

		cpu_relax();



	UART_CLEAR_DLAB(uart);

	chr = UART_GET_CHAR(uart);



	return chr;

}

#endif



#if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \

	defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)

static void bfin_kgdboc_port_shutdown(struct uart_port *port)

{

	if (kgdboc_break_enabled) {

		kgdboc_break_enabled = 0;

		bfin_serial_shutdown(port);

	}

}



static int bfin_kgdboc_port_startup(struct uart_port *port)

{

	kgdboc_port_line = port->line;

	kgdboc_break_enabled = !bfin_serial_startup(port);

	return 0;

}

#endif



static struct uart_ops bfin_serial_pops = {

	.tx_empty	= bfin_serial_tx_empty,

	.set_mctrl	= bfin_serial_set_mctrl,
@@ -905,6 +908,15 @@ static struct uart_ops bfin_serial_pops = { 
	.request_port	= bfin_serial_request_port,

	.config_port	= bfin_serial_config_port,

	.verify_port	= bfin_serial_verify_port,

#if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \

	defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)

	.kgdboc_port_startup	= bfin_kgdboc_port_startup,

	.kgdboc_port_shutdown	= bfin_kgdboc_port_shutdown,

#endif

#ifdef CONFIG_CONSOLE_POLL

	.poll_put_char	= bfin_serial_poll_put_char,

	.poll_get_char	= bfin_serial_poll_get_char,

#endif

};



static void __init bfin_serial_init_ports(void)
@@ -1076,10 +1088,7 @@ static int __init bfin_serial_rs_console_init(void) 
{

	bfin_serial_init_ports();

	register_console(&bfin_serial_console);

#ifdef CONFIG_KGDB_UART

	kgdb_entry_state = 0;

	init_kgdb_uart();

#endif



	return 0;

}

console_initcall(bfin_serial_rs_console_init);
@@ -1235,10 +1244,6 @@ static struct platform_driver bfin_serial_driver = { 
static int __init bfin_serial_init(void)

{

	int ret;

#ifdef CONFIG_KGDB_UART

	struct bfin_serial_port *uart = &bfin_serial_ports[CONFIG_KGDB_UART_PORT];

	struct ktermios t;

#endif



	pr_info("Serial: Blackfin serial driver\n");
@@ -1252,21 +1257,6 @@ static int __init bfin_serial_init(void) 
			uart_unregister_driver(&bfin_serial_reg);

		}

	}

#ifdef CONFIG_KGDB_UART

	if (uart->port.cons->index != CONFIG_KGDB_UART_PORT) {

		request_irq(uart->port.irq, bfin_serial_rx_int,

			IRQF_DISABLED, "BFIN_UART_RX", uart);

		pr_info("Request irq for kgdb uart port\n");

		UART_SET_IER(uart, ERBFI);

		SSYNC();

		t.c_cflag = CS8|B57600;

		t.c_iflag = 0;

		t.c_oflag = 0;

		t.c_lflag = ICANON;

		t.c_line = CONFIG_KGDB_UART_PORT;

		bfin_serial_set_termios(&uart->port, &t, &t);

	}

#endif

	return ret;

}
@@ -1276,6 +1266,7 @@ static void __exit bfin_serial_exit(void) 
	uart_unregister_driver(&bfin_serial_reg);

}





module_init(bfin_serial_init);

module_exit(bfin_serial_exit);