dm: core: Replace of_offset with accessor

[people/ms/u-boot.git] / drivers / serial / serial_arc.c

diff --git a/drivers/serial/serial_arc.c b/drivers/serial/serial_arc.c
index 2ddbf32a507ace37bbd66d54402e0d3895b7785f..fc91977b4c8aa358aa1c5dbe5b426166202ae260 100644 (file)
--- a/drivers/serial/serial_arc.c
+++ b/drivers/serial/serial_arc.c
@@ -8,6 +8,7 @@
  */
 
 #include <common.h>
+#include <dm.h>
 #include <serial.h>
 
 DECLARE_GLOBAL_DATA_PTR;
@@ -23,67 +24,65 @@ struct arc_serial_regs {
        unsigned int baudh;
 };
 
+
+struct arc_serial_platdata {
+       struct arc_serial_regs *reg;
+       unsigned int uartclk;
+};
+
 /* Bit definitions of STATUS register */
 #define UART_RXEMPTY           (1 << 5)
 #define UART_OVERFLOW_ERR      (1 << 1)
 #define UART_TXEMPTY           (1 << 7)
 
-struct arc_serial_regs *regs;
-
-static void arc_serial_setbrg(void)
+static int arc_serial_setbrg(struct udevice *dev, int baudrate)
 {
-       int arc_console_baud;
+       struct arc_serial_platdata *plat = dev->platdata;
+       struct arc_serial_regs *const regs = plat->reg;
+       int arc_console_baud = gd->cpu_clk / (baudrate * 4) - 1;
 
-       if (!gd->baudrate)
-               gd->baudrate = CONFIG_BAUDRATE;
-
-       arc_console_baud = gd->cpu_clk / (gd->baudrate * 4) - 1;
        writeb(arc_console_baud & 0xff, &regs->baudl);
-
-#ifdef CONFIG_ARC
-       /*
-        * UART ISS(Instruction Set simulator) emulation has a subtle bug:
-        * A existing value of Baudh = 0 is used as a indication to startup
-        * it's internal state machine.
-        * Thus if baudh is set to 0, 2 times, it chokes.
-        * This happens with BAUD=115200 and the formaula above
-        * Until that is fixed, when running on ISS, we will set baudh to !0
-        */
-       if (gd->arch.running_on_hw)
-               writeb((arc_console_baud & 0xff00) >> 8, &regs->baudh);
-       else
-               writeb(1, &regs->baudh);
-#else
        writeb((arc_console_baud & 0xff00) >> 8, &regs->baudh);
-#endif
-}
 
-static int arc_serial_init(void)
-{
-       regs = (struct arc_serial_regs *)CONFIG_ARC_UART_BASE;
-       serial_setbrg();
        return 0;
 }
 
-static void arc_serial_putc(const char c)
+static int arc_serial_putc(struct udevice *dev, const char c)
 {
-       if (c == '\n')
-               arc_serial_putc('\r');
+       struct arc_serial_platdata *plat = dev->platdata;
+       struct arc_serial_regs *const regs = plat->reg;
 
        while (!(readb(&regs->status) & UART_TXEMPTY))
                ;
 
        writeb(c, &regs->data);
+
+       return 0;
 }
 
-static int arc_serial_tstc(void)
+static int arc_serial_tstc(struct arc_serial_regs *const regs)
 {
        return !(readb(&regs->status) & UART_RXEMPTY);
 }
 
-static int arc_serial_getc(void)
+static int arc_serial_pending(struct udevice *dev, bool input)
 {
-       while (!arc_serial_tstc())
+       struct arc_serial_platdata *plat = dev->platdata;
+       struct arc_serial_regs *const regs = plat->reg;
+       uint32_t status = readb(&regs->status);
+
+       if (input)
+               return status & UART_RXEMPTY ? 0 : 1;
+       else
+               return status & UART_TXEMPTY ? 0 : 1;
+}
+
+static int arc_serial_getc(struct udevice *dev)
+{
+       struct arc_serial_platdata *plat = dev->platdata;
+       struct arc_serial_regs *const regs = plat->reg;
+
+       while (!arc_serial_tstc(regs))
                ;
 
        /* Check for overflow errors */
@@ -93,23 +92,41 @@ static int arc_serial_getc(void)
        return readb(&regs->data) & 0xFF;
 }
 
-static struct serial_device arc_serial_drv = {
-       .name   = "arc_serial",
-       .start  = arc_serial_init,
-       .stop   = NULL,
-       .setbrg = arc_serial_setbrg,
-       .putc   = arc_serial_putc,
-       .puts   = default_serial_puts,
-       .getc   = arc_serial_getc,
-       .tstc   = arc_serial_tstc,
-};
-
-void arc_serial_initialize(void)
+static int arc_serial_probe(struct udevice *dev)
 {
-       serial_register(&arc_serial_drv);
+       return 0;
 }
 
-__weak struct serial_device *default_serial_console(void)
+static const struct dm_serial_ops arc_serial_ops = {
+       .putc = arc_serial_putc,
+       .pending = arc_serial_pending,
+       .getc = arc_serial_getc,
+       .setbrg = arc_serial_setbrg,
+};
+
+static const struct udevice_id arc_serial_ids[] = {
+       { .compatible = "snps,arc-uart" },
+       { }
+};
+
+static int arc_serial_ofdata_to_platdata(struct udevice *dev)
 {
-       return &arc_serial_drv;
+       struct arc_serial_platdata *plat = dev_get_platdata(dev);
+       DECLARE_GLOBAL_DATA_PTR;
+
+       plat->reg = (struct arc_serial_regs *)dev_get_addr(dev);
+       plat->uartclk = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev),
+                                      "clock-frequency", 0);
+
+       return 0;
 }
+
+U_BOOT_DRIVER(serial_arc) = {
+       .name   = "serial_arc",
+       .id     = UCLASS_SERIAL,
+       .of_match = arc_serial_ids,
+       .ofdata_to_platdata = arc_serial_ofdata_to_platdata,
+       .probe = arc_serial_probe,
+       .ops    = &arc_serial_ops,
+       .flags = DM_FLAG_PRE_RELOC,
+};