Commit e92a886b authored by Jakub Kicinski's avatar Jakub Kicinski Committed by Greg Kroah-Hartman
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sc16is7xx: save and use per-chip line number 



In preparation of supporting multiple devices we should save
the per-chip line number (0 or 1), because the uart_port line
will reflect system-wide uart number and will be offseted for
chips other than the first to register.

Signed-off-by: default avatarJakub Kicinski <kubakici@wp.pl>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 8cd90e50

drivers/tty/serial/sc16is7xx.c

+21 −10
Original line number Diff line number Diff line
@@ -312,6 +312,7 @@ struct sc16is7xx_one_config { 


struct sc16is7xx_one {

	struct uart_port		port;

	u8				line;

	struct kthread_work		tx_work;

	struct kthread_work		reg_work;

	struct sc16is7xx_one_config	config;
@@ -335,13 +336,20 @@ struct sc16is7xx_port { 
#define to_sc16is7xx_port(p,e)	((container_of((p), struct sc16is7xx_port, e)))

#define to_sc16is7xx_one(p,e)	((container_of((p), struct sc16is7xx_one, e)))



static int sc16is7xx_line(struct uart_port *port)

{

	struct sc16is7xx_one *one = to_sc16is7xx_one(port, port);



	return one->line;

}



static u8 sc16is7xx_port_read(struct uart_port *port, u8 reg)

{

	struct sc16is7xx_port *s = dev_get_drvdata(port->dev);

	unsigned int val = 0;

	const u8 line = sc16is7xx_line(port);



	regmap_read(s->regmap,

		    (reg << SC16IS7XX_REG_SHIFT) | port->line, &val);

	regmap_read(s->regmap, (reg << SC16IS7XX_REG_SHIFT) | line, &val);



	return val;

}
@@ -349,15 +357,16 @@ static u8 sc16is7xx_port_read(struct uart_port *port, u8 reg) 
static void sc16is7xx_port_write(struct uart_port *port, u8 reg, u8 val)

{

	struct sc16is7xx_port *s = dev_get_drvdata(port->dev);

	const u8 line = sc16is7xx_line(port);



	regmap_write(s->regmap,

		     (reg << SC16IS7XX_REG_SHIFT) | port->line, val);

	regmap_write(s->regmap, (reg << SC16IS7XX_REG_SHIFT) | line, val);

}



static void sc16is7xx_fifo_read(struct uart_port *port, unsigned int rxlen)

{

	struct sc16is7xx_port *s = dev_get_drvdata(port->dev);

	u8 addr = (SC16IS7XX_RHR_REG << SC16IS7XX_REG_SHIFT) | port->line;

	const u8 line = sc16is7xx_line(port);

	u8 addr = (SC16IS7XX_RHR_REG << SC16IS7XX_REG_SHIFT) | line;



	regcache_cache_bypass(s->regmap, true);

	regmap_raw_read(s->regmap, addr, s->buf, rxlen);
@@ -367,7 +376,8 @@ static void sc16is7xx_fifo_read(struct uart_port *port, unsigned int rxlen) 
static void sc16is7xx_fifo_write(struct uart_port *port, u8 to_send)

{

	struct sc16is7xx_port *s = dev_get_drvdata(port->dev);

	u8 addr = (SC16IS7XX_THR_REG << SC16IS7XX_REG_SHIFT) | port->line;

	const u8 line = sc16is7xx_line(port);

	u8 addr = (SC16IS7XX_THR_REG << SC16IS7XX_REG_SHIFT) | line;



	regcache_cache_bypass(s->regmap, true);

	regmap_raw_write(s->regmap, addr, s->buf, to_send);
@@ -378,9 +388,9 @@ static void sc16is7xx_port_update(struct uart_port *port, u8 reg, 
				  u8 mask, u8 val)

{

	struct sc16is7xx_port *s = dev_get_drvdata(port->dev);

	const u8 line = sc16is7xx_line(port);



	regmap_update_bits(s->regmap,

			   (reg << SC16IS7XX_REG_SHIFT) | port->line,

	regmap_update_bits(s->regmap, (reg << SC16IS7XX_REG_SHIFT) | line,

			   mask, val);

}
@@ -508,7 +518,7 @@ static void sc16is7xx_handle_rx(struct uart_port *port, unsigned int rxlen, 


	if (unlikely(rxlen >= sizeof(s->buf))) {

		dev_warn_ratelimited(port->dev,

				     "Port %i: Possible RX FIFO overrun: %d\n",

				     "ttySC%i: Possible RX FIFO overrun: %d\n",

				     port->line, rxlen);

		port->icount.buf_overrun++;

		/* Ensure sanity of RX level */
@@ -649,7 +659,7 @@ static void sc16is7xx_port_irq(struct sc16is7xx_port *s, int portno) 
			break;

		default:

			dev_err_ratelimited(port->dev,

					    "Port %i: Unexpected interrupt: %x",

					    "ttySC%i: Unexpected interrupt: %x",

					    port->line, iir);

			break;

		}
@@ -1174,6 +1184,7 @@ static int sc16is7xx_probe(struct device *dev, 
#endif



	for (i = 0; i < devtype->nr_uart; ++i) {

		s->p[i].line		= i;

		/* Initialize port data */

		s->p[i].port.line	= i;

		s->p[i].port.dev	= dev;

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