bcm283x_pl011: Flush RX queue after setting baud rate

[u-boot] / drivers / serial / serial_pl01x.c

diff --git a/drivers/serial/serial_pl01x.c b/drivers/serial/serial_pl01x.c
index ad503afcad540c3b7901e462ba024d1a382ad71d..45f12827703ad0db222827dbc2da358603409072 100644 (file)
--- a/drivers/serial/serial_pl01x.c
+++ b/drivers/serial/serial_pl01x.c
@@ -20,7 +20,6 @@
 #include <dm/platform_data/serial_pl01x.h>
 #include <linux/compiler.h>
 #include "serial_pl01x_internal.h"
-#include <fdtdec.h>
 
 DECLARE_GLOBAL_DATA_PTR;
 
@@ -80,13 +79,6 @@ static int pl01x_generic_serial_init(struct pl01x_regs *regs,
                writel(0, &regs->pl010_cr);
                break;
        case TYPE_PL011:
-#ifdef CONFIG_PL011_SERIAL_FLUSH_ON_INIT
-               /* Empty RX fifo if necessary */
-               if (readl(&regs->pl011_cr) & UART_PL011_CR_UARTEN) {
-                       while (!(readl(&regs->fr) & UART_PL01x_FR_RXFE))
-                               readl(&regs->dr);
-               }
-#endif
                /* disable everything */
                writel(0, &regs->pl011_cr);
                break;
@@ -105,21 +97,6 @@ static int pl011_set_line_control(struct pl01x_regs *regs)
         * control register write
         */
        lcr = UART_PL011_LCRH_WLEN_8 | UART_PL011_LCRH_FEN;
-#ifdef CONFIG_PL011_SERIAL_RLCR
-       {
-               int i;
-
-               /*
-                * Program receive line control register after waiting
-                * 10 bus cycles.  Delay be writing to readonly register
-                * 10 times
-                */
-               for (i = 0; i < 10; i++)
-                       writel(lcr, &regs->fr);
-
-               writel(lcr, &regs->pl011_rlcr);
-       }
-#endif
        writel(lcr, &regs->pl011_lcrh);
        return 0;
 }
@@ -139,7 +116,7 @@ static int pl01x_generic_setbrg(struct pl01x_regs *regs, enum pl01x_type type,
                        divisor = UART_PL010_BAUD_9600;
                        break;
                case 19200:
-                       divisor = UART_PL010_BAUD_9600;
+                       divisor = UART_PL010_BAUD_19200;
                        break;
                case 38400:
                        divisor = UART_PL010_BAUD_38400;
@@ -296,46 +273,47 @@ __weak struct serial_device *default_serial_console(void)
 
 #ifdef CONFIG_DM_SERIAL
 
-struct pl01x_priv {
-       struct pl01x_regs *regs;
-       enum pl01x_type type;
-};
-
-static int pl01x_serial_setbrg(struct udevice *dev, int baudrate)
+int pl01x_serial_setbrg(struct udevice *dev, int baudrate)
 {
        struct pl01x_serial_platdata *plat = dev_get_platdata(dev);
        struct pl01x_priv *priv = dev_get_priv(dev);
 
-       pl01x_generic_setbrg(priv->regs, priv->type, plat->clock, baudrate);
+       if (!plat->skip_init) {
+               pl01x_generic_setbrg(priv->regs, priv->type, plat->clock,
+                                    baudrate);
+       }
 
        return 0;
 }
 
-static int pl01x_serial_probe(struct udevice *dev)
+int pl01x_serial_probe(struct udevice *dev)
 {
        struct pl01x_serial_platdata *plat = dev_get_platdata(dev);
        struct pl01x_priv *priv = dev_get_priv(dev);
 
        priv->regs = (struct pl01x_regs *)plat->base;
        priv->type = plat->type;
-       return pl01x_generic_serial_init(priv->regs, priv->type);
+       if (!plat->skip_init)
+               return pl01x_generic_serial_init(priv->regs, priv->type);
+       else
+               return 0;
 }
 
-static int pl01x_serial_getc(struct udevice *dev)
+int pl01x_serial_getc(struct udevice *dev)
 {
        struct pl01x_priv *priv = dev_get_priv(dev);
 
        return pl01x_getc(priv->regs);
 }
 
-static int pl01x_serial_putc(struct udevice *dev, const char ch)
+int pl01x_serial_putc(struct udevice *dev, const char ch)
 {
        struct pl01x_priv *priv = dev_get_priv(dev);
 
        return pl01x_putc(priv->regs, ch);
 }
 
-static int pl01x_serial_pending(struct udevice *dev, bool input)
+int pl01x_serial_pending(struct udevice *dev, bool input)
 {
        struct pl01x_priv *priv = dev_get_priv(dev);
        unsigned int fr = readl(&priv->regs->fr);
@@ -353,25 +331,27 @@ static const struct dm_serial_ops pl01x_serial_ops = {
        .setbrg = pl01x_serial_setbrg,
 };
 
-#ifdef CONFIG_OF_CONTROL
+#if CONFIG_IS_ENABLED(OF_CONTROL)
 static const struct udevice_id pl01x_serial_id[] ={
        {.compatible = "arm,pl011", .data = TYPE_PL011},
        {.compatible = "arm,pl010", .data = TYPE_PL010},
        {}
 };
 
-static int pl01x_serial_ofdata_to_platdata(struct udevice *dev)
+int pl01x_serial_ofdata_to_platdata(struct udevice *dev)
 {
        struct pl01x_serial_platdata *plat = dev_get_platdata(dev);
        fdt_addr_t addr;
 
-       addr = fdtdec_get_addr(gd->fdt_blob, dev->of_offset, "reg");
+       addr = devfdt_get_addr(dev);
        if (addr == FDT_ADDR_T_NONE)
                return -EINVAL;
 
        plat->base = addr;
-       plat->clock = fdtdec_get_int(gd->fdt_blob, dev->of_offset, "clock", 1);
+       plat->clock = dev_read_u32_default(dev, "clock", 1);
        plat->type = dev_get_driver_data(dev);
+       plat->skip_init = dev_read_bool(dev, "skip-init");
+
        return 0;
 }
 #endif
@@ -389,3 +369,31 @@ U_BOOT_DRIVER(serial_pl01x) = {
 };
 
 #endif
+
+#if defined(CONFIG_DEBUG_UART_PL010) || defined(CONFIG_DEBUG_UART_PL011)
+
+#include <debug_uart.h>
+
+static void _debug_uart_init(void)
+{
+#ifndef CONFIG_DEBUG_UART_SKIP_INIT
+       struct pl01x_regs *regs = (struct pl01x_regs *)CONFIG_DEBUG_UART_BASE;
+       enum pl01x_type type = CONFIG_IS_ENABLED(DEBUG_UART_PL011) ?
+                               TYPE_PL011 : TYPE_PL010;
+
+       pl01x_generic_serial_init(regs, type);
+       pl01x_generic_setbrg(regs, type,
+                            CONFIG_DEBUG_UART_CLOCK, CONFIG_BAUDRATE);
+#endif
+}
+
+static inline void _debug_uart_putc(int ch)
+{
+       struct pl01x_regs *regs = (struct pl01x_regs *)CONFIG_DEBUG_UART_BASE;
+
+       pl01x_putc(regs, ch);
+}
+
+DEBUG_UART_FUNCS
+
+#endif