#include <dm.h>
#include <errno.h>
#include <watchdog.h>
+#include <asm/gpio.h>
#include <asm/io.h>
#include <serial.h>
#include <dm/platform_data/serial_bcm283x_mu.h>
+#include <dm/pinctrl.h>
#include <linux/compiler.h>
-#include <fdtdec.h>
-
-DECLARE_GLOBAL_DATA_PTR;
struct bcm283x_mu_regs {
u32 io;
struct bcm283x_mu_regs *regs = priv->regs;
u32 divider;
- if (plat->disabled || plat->skip_init)
+ if (plat->skip_init)
return 0;
divider = plat->clock / (baudrate * 8);
struct bcm283x_mu_serial_platdata *plat = dev_get_platdata(dev);
struct bcm283x_mu_priv *priv = dev_get_priv(dev);
- if (plat->disabled)
- return -ENODEV;
-
priv->regs = (struct bcm283x_mu_regs *)plat->base;
return 0;
static int bcm283x_mu_serial_getc(struct udevice *dev)
{
- struct bcm283x_mu_serial_platdata *plat = dev_get_platdata(dev);
struct bcm283x_mu_priv *priv = dev_get_priv(dev);
struct bcm283x_mu_regs *regs = priv->regs;
u32 data;
- if (plat->disabled)
- return -EAGAIN;
-
/* Wait until there is data in the FIFO */
if (!(readl(®s->lsr) & BCM283X_MU_LSR_RX_READY))
return -EAGAIN;
static int bcm283x_mu_serial_putc(struct udevice *dev, const char data)
{
- struct bcm283x_mu_serial_platdata *plat = dev_get_platdata(dev);
struct bcm283x_mu_priv *priv = dev_get_priv(dev);
struct bcm283x_mu_regs *regs = priv->regs;
- if (plat->disabled)
- return 0;
-
/* Wait until there is space in the FIFO */
if (!(readl(®s->lsr) & BCM283X_MU_LSR_TX_EMPTY))
return -EAGAIN;
static int bcm283x_mu_serial_pending(struct udevice *dev, bool input)
{
- struct bcm283x_mu_serial_platdata *plat = dev_get_platdata(dev);
struct bcm283x_mu_priv *priv = dev_get_priv(dev);
struct bcm283x_mu_regs *regs = priv->regs;
unsigned int lsr;
- if (plat->disabled)
- return 0;
-
lsr = readl(®s->lsr);
if (input) {
{}
};
+/*
+ * Check if this serial device is muxed
+ *
+ * The serial device will only work properly if it has been muxed to the serial
+ * pins by firmware. Check whether that happened here.
+ *
+ * @return true if serial device is muxed, false if not
+ */
+static bool bcm283x_is_serial_muxed(void)
+{
+ int serial_gpio = 15;
+ struct udevice *dev;
+
+ if (uclass_first_device(UCLASS_PINCTRL, &dev) || !dev)
+ return false;
+
+ if (pinctrl_get_gpio_mux(dev, 0, serial_gpio) != BCM2835_GPIO_ALT5)
+ return false;
+
+ return true;
+}
+
static int bcm283x_mu_serial_ofdata_to_platdata(struct udevice *dev)
{
struct bcm283x_mu_serial_platdata *plat = dev_get_platdata(dev);
fdt_addr_t addr;
- addr = dev_get_addr(dev);
+ /* Don't spawn the device if it's not muxed */
+ if (!bcm283x_is_serial_muxed())
+ return -ENODEV;
+
+ 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(dev), "clock",
- 1);
- plat->skip_init = fdtdec_get_bool(gd->fdt_blob, dev_of_offset(dev),
- "skip-init");
- plat->disabled = false;
+ plat->clock = dev_read_u32_default(dev, "clock", 1);
+
+ /*
+ * TODO: Reinitialization doesn't always work for now, just skip
+ * init always - we know we're already initialized
+ */
+ plat->skip_init = true;
+
return 0;
}
#endif