ARM: PL011: Allow better handling of vendor data

Rather than copying all vendor data into the port structure, copy
just that which is frequently used, and keep a pointer to the
remaining vendor data structure.  This makes it easier to add
vendor quirks in the future.

Acked-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

diff --git a/drivers/serial/amba-pl011.c b/drivers/serial/amba-pl011.c
index c77b3eb..6afdd9b 100644 (file)
--- a/drivers/serial/amba-pl011.c
+++ b/drivers/serial/amba-pl011.c
@@ -63,22 +63,6 @@
 #define UART_DR_ERROR          (UART011_DR_OE|UART011_DR_BE|UART011_DR_PE|UART011_DR_FE)
 #define UART_DUMMY_DR_RX       (1 << 16)
 
-/*
- * We wrap our port structure around the generic uart_port.
- */
-struct uart_amba_port {
-       struct uart_port        port;
-       struct clk              *clk;
-       unsigned int            im;             /* interrupt mask */
-       unsigned int            old_status;
-       unsigned int            ifls;           /* vendor-specific */
-       unsigned int            lcrh_tx;        /* vendor-specific */
-       unsigned int            lcrh_rx;        /* vendor-specific */
-       bool                    oversampling;   /* vendor-specific */
-       bool                    autorts;
-       char                    type[12];
-};
-
 /* There is by now at least one vendor with differing details, so handle it */
 struct vendor_data {
        unsigned int            ifls;
@@ -104,6 +88,21 @@ static struct vendor_data vendor_st = {
        .oversampling           = true,
 };
 
+/*
+ * We wrap our port structure around the generic uart_port.
+ */
+struct uart_amba_port {
+       struct uart_port        port;
+       struct clk              *clk;
+       const struct vendor_data *vendor;
+       unsigned int            im;             /* interrupt mask */
+       unsigned int            old_status;
+       unsigned int            lcrh_tx;        /* vendor-specific */
+       unsigned int            lcrh_rx;        /* vendor-specific */
+       bool                    autorts;
+       char                    type[12];
+};
+
 static void pl011_stop_tx(struct uart_port *port)
 {
        struct uart_amba_port *uap = (struct uart_amba_port *)port;
@@ -397,7 +396,7 @@ static int pl011_startup(struct uart_port *port)
        if (retval)
                goto clk_dis;
 
-       writew(uap->ifls, uap->port.membase + UART011_IFLS);
+       writew(uap->vendor->ifls, uap->port.membase + UART011_IFLS);
 
        /*
         * Provoke TX FIFO interrupt into asserting.
@@ -503,13 +502,18 @@ pl011_set_termios(struct uart_port *port, struct ktermios *termios,
        struct uart_amba_port *uap = (struct uart_amba_port *)port;
        unsigned int lcr_h, old_cr;
        unsigned long flags;
-       unsigned int baud, quot;
+       unsigned int baud, quot, clkdiv;
+
+       if (uap->vendor->oversampling)
+               clkdiv = 8;
+       else
+               clkdiv = 16;
 
        /*
         * Ask the core to calculate the divisor for us.
         */
        baud = uart_get_baud_rate(port, termios, old, 0,
-                                 port->uartclk/(uap->oversampling ? 8 : 16));
+                                 port->uartclk / clkdiv);
 
        if (baud > port->uartclk/16)
                quot = DIV_ROUND_CLOSEST(port->uartclk * 8, baud);
@@ -593,8 +597,8 @@ pl011_set_termios(struct uart_port *port, struct ktermios *termios,
                uap->autorts = false;
        }
 
-       if (uap->oversampling) {
-               if (baud > port->uartclk/16)
+       if (uap->vendor->oversampling) {
+               if (baud > port->uartclk / 16)
                        old_cr |= ST_UART011_CR_OVSFACT;
                else
                        old_cr &= ~ST_UART011_CR_OVSFACT;
@@ -767,7 +771,7 @@ pl011_console_get_options(struct uart_amba_port *uap, int *baud,
 
                *baud = uap->port.uartclk * 4 / (64 * ibrd + fbrd);
 
-               if (uap->oversampling) {
+               if (uap->vendor->oversampling) {
                        if (readw(uap->port.membase + UART011_CR)
                                  & ST_UART011_CR_OVSFACT)
                                *baud *= 2;
@@ -864,10 +868,9 @@ static int pl011_probe(struct amba_device *dev, struct amba_id *id)
                goto unmap;
        }
 
-       uap->ifls = vendor->ifls;
+       uap->vendor = vendor;
        uap->lcrh_rx = vendor->lcrh_rx;
        uap->lcrh_tx = vendor->lcrh_tx;
-       uap->oversampling = vendor->oversampling;
        uap->port.dev = &dev->dev;
        uap->port.mapbase = dev->res.start;
        uap->port.membase = base;