uart00.c

来自「Linux Kernel 2.6.9 for OMAP1710」· C语言 代码 · 共 786 行 · 第 1/2 页

	/* Set baud rate */
	UART_PUT_DIV_LO(port, (quot & 0xff));
	UART_PUT_DIV_HI(port, ((quot & 0xf00) >> 8));

	UART_PUT_MC(port, uart_mc);
	UART_PUT_IES(port, old_ies);

	spin_unlock_irqrestore(&port->lock, flags);
}

static int uart00_startup(struct uart_port *port)
{
	int result;

	/*
	 * Allocate the IRQ
	 */
	result = request_irq(port->irq, uart00_int, 0, "uart00", port);
	if (result) {
		printk(KERN_ERR "Request of irq %d failed\n", port->irq);
		return result;
	}

	/*
	 * Finally, enable interrupts. Use the TII interrupt to minimise 
	 * the number of interrupts generated. If higher performance is 
	 * needed, consider using the TI interrupt with a suitable FIFO
	 * threshold
	 */
	UART_PUT_IES(port, UART_IES_RE_MSK | UART_IES_TIE_MSK);

	return 0;
}

static void uart00_shutdown(struct uart_port *port)
{
	/*
	 * disable all interrupts, disable the port
	 */
	UART_PUT_IEC(port, 0xff);

	/* disable break condition and fifos */
	UART_PUT_MCR(port, UART_GET_MCR(port) &~UART_MCR_BR_MSK);

        /*
	 * Free the interrupt
	 */
	free_irq(port->irq, port);
}

static const char *uart00_type(struct uart_port *port)
{
	return port->type == PORT_UART00 ? "Altera UART00" : NULL;
}

/*
 * Release the memory region(s) being used by 'port'
 */
static void uart00_release_port(struct uart_port *port)
{
	release_mem_region(port->mapbase, UART_PORT_SIZE);

#ifdef CONFIG_ARCH_CAMELOT
	if (port->membase != (void*)IO_ADDRESS(EXC_UART00_BASE)) {
		iounmap(port->membase);
	}
#endif
}

/*
 * Request the memory region(s) being used by 'port'
 */
static int uart00_request_port(struct uart_port *port)
{
	return request_mem_region(port->mapbase, UART_PORT_SIZE, "serial_uart00")
			!= NULL ? 0 : -EBUSY;
}

/*
 * Configure/autoconfigure the port.
 */
static void uart00_config_port(struct uart_port *port, int flags)
{

	/*
	 * Map the io memory if this is a soft uart
	 */
	if (!port->membase)
		port->membase = ioremap_nocache(port->mapbase,SZ_4K);

	if (!port->membase)
		printk(KERN_ERR "serial00: cannot map io memory\n");
	else
		port->type = PORT_UART00;

}

/*
 * verify the new serial_struct (for TIOCSSERIAL).
 */
static int uart00_verify_port(struct uart_port *port, struct serial_struct *ser)
{
	int ret = 0;
	if (ser->type != PORT_UNKNOWN && ser->type != PORT_UART00)
		ret = -EINVAL;
	if (ser->irq < 0 || ser->irq >= NR_IRQS)
		ret = -EINVAL;
	if (ser->baud_base < 9600)
		ret = -EINVAL;
	return ret;
}

static struct uart_ops uart00_pops = {
	.tx_empty	= uart00_tx_empty,
	.set_mctrl	= uart00_set_mctrl_null,
	.get_mctrl	= uart00_get_mctrl,
	.stop_tx	= uart00_stop_tx,
	.start_tx	= uart00_start_tx,
	.stop_rx	= uart00_stop_rx,
	.enable_ms	= uart00_enable_ms,
	.break_ctl	= uart00_break_ctl,
	.startup	= uart00_startup,
	.shutdown	= uart00_shutdown,
	.set_termios	= uart00_set_termios,
	.type		= uart00_type,
	.release_port	= uart00_release_port,
	.request_port	= uart00_request_port,
	.config_port	= uart00_config_port,
	.verify_port	= uart00_verify_port,
};


#ifdef CONFIG_ARCH_CAMELOT
static struct uart_port epxa10db_port = {
	.membase	= (void*)IO_ADDRESS(EXC_UART00_BASE),
	.mapbase	= EXC_UART00_BASE,
	.iotype		= SERIAL_IO_MEM,
	.irq		= IRQ_UART,
	.uartclk	= EXC_AHB2_CLK_FREQUENCY,
	.fifosize	= 16,
	.ops		= &uart00_pops,
	.flags		= ASYNC_BOOT_AUTOCONF,
};
#endif


#ifdef CONFIG_SERIAL_UART00_CONSOLE
static void uart00_console_write(struct console *co, const char *s, unsigned count)
{
#ifdef CONFIG_ARCH_CAMELOT
	struct uart_port *port = &epxa10db_port;
	unsigned int status, old_ies;
	int i;

	/*
	 *	First save the CR then disable the interrupts
	 */
	old_ies = UART_GET_IES(port);
	UART_PUT_IEC(port,0xff);

	/*
	 *	Now, do each character
	 */
	for (i = 0; i < count; i++) {
		do {
			status = UART_GET_TSR(port);
		} while (!UART_TX_READY(status));
		UART_PUT_CHAR(port, s[i]);
		if (s[i] == '\n') {
			do {
				status = UART_GET_TSR(port);
			} while (!UART_TX_READY(status));
			UART_PUT_CHAR(port, '\r');
		}
	}

	/*
	 *	Finally, wait for transmitter to become empty
	 *	and restore the IES
	 */
	do {
		status = UART_GET_TSR(port);
	} while (status & UART_TSR_TX_LEVEL_MSK);
	UART_PUT_IES(port, old_ies);
#endif
}

static void __init
uart00_console_get_options(struct uart_port *port, int *baud,
			   int *parity, int *bits)
{
	unsigned int uart_mc, quot;

	uart_mc = UART_GET_MC(port);

	*parity = 'n';
	if (uart_mc & UART_MC_PE_MSK) {
		if (uart_mc & UART_MC_EP_MSK)
			*parity = 'e';
		else
			*parity = 'o';
	}

	switch (uart_mc & UART_MC_CLS_MSK) {
	case UART_MC_CLS_CHARLEN_5:
		*bits = 5;
		break;
	case UART_MC_CLS_CHARLEN_6:
		*bits = 6;
		break;
	case UART_MC_CLS_CHARLEN_7:
		*bits = 7;
		break;
	case UART_MC_CLS_CHARLEN_8:
		*bits = 8;
		break;
	}
	quot = UART_GET_DIV_LO(port) | (UART_GET_DIV_HI(port) << 8);
	*baud = port->uartclk / (16 *quot );
}

static int __init uart00_console_setup(struct console *co, char *options)
{
	struct uart_port *port;
	int baud = 115200;
	int bits = 8;
	int parity = 'n';
	int flow = 'n';

#ifdef CONFIG_ARCH_CAMELOT
	port = &epxa10db_port;             ;
#else
	return -ENODEV;
#endif
	if (options)
		uart_parse_options(options, &baud, &parity, &bits, &flow);
	else
		uart00_console_get_options(port, &baud, &parity, &bits);

	return uart_set_options(port, co, baud, parity, bits, flow);
}

extern struct uart_driver uart00_reg;
static struct console uart00_console = {
	.name		= SERIAL_UART00_NAME,
	.write		= uart00_console_write,
	.device		= uart_console_device,
	.setup		= uart00_console_setup,
	.flags		= CON_PRINTBUFFER,
	.index		= 0,
	.data		= &uart00_reg,
};

static int __init uart00_console_init(void)
{
	register_console(&uart00_console);
	return 0;
}
console_initcall(uart00_console_init);

#define UART00_CONSOLE	&uart00_console
#else
#define UART00_CONSOLE	NULL
#endif

static struct uart_driver uart00_reg = {
	.owner			= NULL,
	.driver_name		= SERIAL_UART00_NAME,
	.dev_name		= SERIAL_UART00_NAME,
	.major			= SERIAL_UART00_MAJOR,
	.minor			= SERIAL_UART00_MINOR,
	.nr			= UART_NR,
	.cons			= UART00_CONSOLE,
};

struct dev_port_entry{
	unsigned int base_addr;
	struct uart_port *port;
};

#ifdef CONFIG_PLD_HOTSWAP

static struct dev_port_entry dev_port_map[UART_NR];

/*
 * Keep a mapping of dev_info addresses -> port lines to use when
 * removing ports dev==NULL indicates unused entry
 */

struct uart00_ps_data{
	unsigned int clk;
	unsigned int fifosize;
};

int uart00_add_device(struct pldhs_dev_info* dev_info, void* dev_ps_data)
{
	struct uart00_ps_data* dev_ps=dev_ps_data;
	struct uart_port * port;
	int i,result;

	i=0;
	while(dev_port_map[i].port)
		i++;

	if(i==UART_NR){
		printk(KERN_WARNING "uart00: Maximum number of ports reached\n");
		return 0;
	}

	port=kmalloc(sizeof(struct uart_port),GFP_KERNEL);
	if(!port)
		return -ENOMEM;

	printk("clk=%d fifo=%d\n",dev_ps->clk,dev_ps->fifosize);
	port->membase=0;
	port->mapbase=dev_info->base_addr;
	port->iotype=SERIAL_IO_MEM;
	port->irq=dev_info->irq;
	port->uartclk=dev_ps->clk;
	port->fifosize=dev_ps->fifosize;
	port->ops=&uart00_pops;
	port->line=i;
	port->flags=ASYNC_BOOT_AUTOCONF;

	result=uart_add_one_port(&uart00_reg, port);
	if(result){
		printk("uart_add_one_port returned %d\n",result);
		return result;
	}
	dev_port_map[i].base_addr=dev_info->base_addr;
	dev_port_map[i].port=port;
	printk("uart00: added device at %x as ttyUA%d\n",dev_port_map[i].base_addr,i);
	return 0;

}

int uart00_remove_devices(void)
{
	int i,result;


	result=0;
	for(i=1;i<UART_NR;i++){
		if(dev_port_map[i].base_addr){
			result=uart_remove_one_port(&uart00_reg, dev_port_map[i].port);
			if(result)
				return result;

			/* port removed sucessfully, so now tidy up */
			kfree(dev_port_map[i].port);
			dev_port_map[i].base_addr=0;
			dev_port_map[i].port=NULL;
		}
	}
	return 0;

}

struct pld_hotswap_ops uart00_pldhs_ops={
	.name		= "uart00",
	.add_device	= uart00_add_device,
	.remove_devices	= uart00_remove_devices,
};

#endif

static int __init uart00_init(void)
{
	int result;

	printk(KERN_INFO "Serial: UART00 driver $Revision: 1.35 $\n");

	printk(KERN_WARNING "serial_uart00:Using temporary major/minor pairs"
		" - these WILL change in the future\n");

	result = uart_register_driver(&uart00_reg);
	if (result)
		return result;
#ifdef CONFIG_ARCH_CAMELOT
	result = uart_add_one_port(&uart00_reg,&epxa10db_port);
#endif
	if (result)
		uart_unregister_driver(&uart00_reg);

#ifdef  CONFIG_PLD_HOTSWAP
	pldhs_register_driver(&uart00_pldhs_ops);
#endif
	return result;
}

__initcall(uart00_init);