sc16is7xx: fix FIFO address of secondary UART

Calls to regmap_raw_read/write needed register rewrite in a
similar way as function calls to regmap_read/write already had.
This enables reading/writing the serial datastream to the device.

Signed-off-by: Bo Svangård <bo.svangard@embeddedart.se>
Signed-off-by: Jakub Kicinski <kubakici@wp.pl>
Signed-off-by: Jon Ringle <jringle@gridpoint.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/serial/sc16is7xx.c b/drivers/tty/serial/sc16is7xx.c
index 9e65760..5ccc698 100644 (file)
--- a/drivers/tty/serial/sc16is7xx.c
+++ b/drivers/tty/serial/sc16is7xx.c
@@ -354,6 +354,26 @@ static void sc16is7xx_port_write(struct uart_port *port, u8 reg, u8 val)
                     (reg << SC16IS7XX_REG_SHIFT) | port->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;
+
+       regcache_cache_bypass(s->regmap, true);
+       regmap_raw_read(s->regmap, addr, s->buf, rxlen);
+       regcache_cache_bypass(s->regmap, false);
+}
+
+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;
+
+       regcache_cache_bypass(s->regmap, true);
+       regmap_raw_write(s->regmap, addr, s->buf, to_send);
+       regcache_cache_bypass(s->regmap, false);
+}
+
 static void sc16is7xx_port_update(struct uart_port *port, u8 reg,
                                  u8 mask, u8 val)
 {
@@ -508,10 +528,7 @@ static void sc16is7xx_handle_rx(struct uart_port *port, unsigned int rxlen,
                        s->buf[0] = sc16is7xx_port_read(port, SC16IS7XX_RHR_REG);
                        bytes_read = 1;
                } else {
-                       regcache_cache_bypass(s->regmap, true);
-                       regmap_raw_read(s->regmap, SC16IS7XX_RHR_REG,
-                                       s->buf, rxlen);
-                       regcache_cache_bypass(s->regmap, false);
+                       sc16is7xx_fifo_read(port, rxlen);
                        bytes_read = rxlen;
                }
 
@@ -591,9 +608,8 @@ static void sc16is7xx_handle_tx(struct uart_port *port)
                        s->buf[i] = xmit->buf[xmit->tail];
                        xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
                }
-               regcache_cache_bypass(s->regmap, true);
-               regmap_raw_write(s->regmap, SC16IS7XX_THR_REG, s->buf, to_send);
-               regcache_cache_bypass(s->regmap, false);
+
+               sc16is7xx_fifo_write(port, to_send);
        }
 
        if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)