leandrof/linux
1
0
Fork 0
forked from Minki/linux
Code Issues Pull Requests Packages Projects Releases Wiki Activity

tty/serial: atmel_serial: add device tree support

Browse Source 
Will use aliases to enumerate ports, if available.

Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Acked-by: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Nicolas Ferre 2011-10-12 18:07:00 +02:00 committed by Greg Kroah-Hartman
parent 4cbf9f4864
commit 5fbe46b676
1 changed files with 71 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

79
drivers/tty/serial/atmel_serial.c
View File

@ -33,6 +33,8 @@
#include <linux/sysrq.h>
#include <linux/tty_flip.h>
#include <linux/platform_device.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/dma-mapping.h>
#include <linux/atmel_pdc.h>
#include <linux/atmel_serial.h>
@ -163,6 +165,16 @@ static unsigned long atmel_ports_in_use;
static struct console atmel_console;
#endif
#if defined(CONFIG_OF)
static const struct of_device_id atmel_serial_dt_ids[] = {
{ .compatible = "atmel,at91rm9200-usart" },
{ .compatible = "atmel,at91sam9260-usart" },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, atmel_serial_dt_ids);
#endif
static inline struct atmel_uart_port *
to_atmel_uart_port(struct uart_port *uart)
{
@ -1411,6 +1423,48 @@ static struct uart_ops atmel_pops = {
#endif
};
static void __devinit atmel_of_init_port(struct atmel_uart_port *atmel_port,
struct device_node *np)
{
u32 rs485_delay[2];
/* DMA/PDC usage specification */
if (of_get_property(np, "atmel,use-dma-rx", NULL))
atmel_port->use_dma_rx = 1;
else
atmel_port->use_dma_rx = 0;
if (of_get_property(np, "atmel,use-dma-tx", NULL))
atmel_port->use_dma_tx = 1;
else
atmel_port->use_dma_tx = 0;
/* rs485 properties */
if (of_property_read_u32_array(np, "rs485-rts-delay",
rs485_delay, 2) == 0) {
struct serial_rs485 *rs485conf = &atmel_port->rs485;
rs485conf->delay_rts_before_send = rs485_delay[0];
rs485conf->delay_rts_after_send = rs485_delay[1];
rs485conf->flags = 0;
if (rs485conf->delay_rts_before_send == 0 &&
rs485conf->delay_rts_after_send == 0) {
rs485conf->flags |= SER_RS485_RTS_ON_SEND;
} else {
if (rs485conf->delay_rts_before_send)
rs485conf->flags |= SER_RS485_RTS_BEFORE_SEND;
if (rs485conf->delay_rts_after_send)
rs485conf->flags |= SER_RS485_RTS_AFTER_SEND;
}
if (of_get_property(np, "rs485-rx-during-tx", NULL))
rs485conf->flags |= SER_RS485_RX_DURING_TX;
if (of_get_property(np, "linux,rs485-enabled-at-boot-time", NULL))
rs485conf->flags |= SER_RS485_ENABLED;
}
}
/*
* Configure the port from the platform device resource info.
*/
@ -1420,6 +1474,14 @@ static void __devinit atmel_init_port(struct atmel_uart_port *atmel_port,
struct uart_port *port = &atmel_port->uart;
struct atmel_uart_data *pdata = pdev->dev.platform_data;
if (pdev->dev.of_node) {
atmel_of_init_port(atmel_port, pdev->dev.of_node);
} else {
atmel_port->use_dma_rx = pdata->use_dma_rx;
atmel_port->use_dma_tx = pdata->use_dma_tx;
atmel_port->rs485 = pdata->rs485;
}
port->iotype = UPIO_MEM;
port->flags = UPF_BOOT_AUTOCONF;
port->ops = &atmel_pops;
@ -1433,7 +1495,7 @@ static void __devinit atmel_init_port(struct atmel_uart_port *atmel_port,
memset(&atmel_port->rx_ring, 0, sizeof(atmel_port->rx_ring));
if (pdata->regs) {
if (pdata && pdata->regs) {
/* Already mapped by setup code */
port->membase = pdata->regs;
} else {
@ -1450,10 +1512,6 @@ static void __devinit atmel_init_port(struct atmel_uart_port *atmel_port,
/* only enable clock when USART is in use */
}
atmel_port->use_dma_rx = pdata->use_dma_rx;
atmel_port->use_dma_tx = pdata->use_dma_tx;
atmel_port->rs485 = pdata->rs485;
/* Use TXEMPTY for interrupt when rs485 else TXRDY or ENDTX|TXBUFE */
if (atmel_port->rs485.flags & SER_RS485_ENABLED)
atmel_port->tx_done_mask = ATMEL_US_TXEMPTY;
@ -1718,17 +1776,21 @@ static int atmel_serial_resume(struct platform_device *pdev)
static int __devinit atmel_serial_probe(struct platform_device *pdev)
{
struct atmel_uart_port *port;
struct device_node *np = pdev->dev.of_node;
struct atmel_uart_data *pdata = pdev->dev.platform_data;
void *data;
int ret = -ENODEV;
BUILD_BUG_ON(ATMEL_SERIAL_RINGSIZE & (ATMEL_SERIAL_RINGSIZE - 1));
if (pdata)
ret = pdata->num;
if (np)
ret = of_alias_get_id(np, "serial");
else
if (pdata)
ret = pdata->num;
if (ret < 0)
/* port id not found in platform data:
/* port id not found in platform data nor device-tree aliases:
* auto-enumerate it */
ret = find_first_zero_bit(&atmel_ports_in_use,
sizeof(atmel_ports_in_use));
@ -1827,6 +1889,7 @@ static struct platform_driver atmel_serial_driver = {
.driver = {
.name = "atmel_usart",
.owner = THIS_MODULE,
.of_match_table = of_match_ptr(atmel_serial_dt_ids),
},
};