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serial: bcm283x_mu: support disabling after initialization

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For the Raspberry Pi 3 it needs to be possible to disable the serial
device after initialization happens, as only after the GPIO device is available
it is known whether the mini uart is usable.

Signed-off-by: Fabian Vogt <fvogt@suse.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Fabian Vogt 2016-09-26 14:26:49 +02:00 committed by Tom Rini
parent ff5d7ae713
commit cb97ad47bf
1 changed files with 16 additions and 2 deletions
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18
drivers/serial/serial_bcm283x_mu.c
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@ -59,7 +59,7 @@ static int bcm283x_mu_serial_setbrg(struct udevice *dev, int baudrate)
struct bcm283x_mu_regs *regs = priv->regs;
u32 divider;
if (plat->skip_init)
if (plat->disabled || plat->skip_init)
return 0;
divider = plat->clock / (baudrate * 8);
@ -85,10 +85,14 @@ static int bcm283x_mu_serial_probe(struct udevice *dev)
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(&regs->lsr) & BCM283X_MU_LSR_RX_READY))
return -EAGAIN;
@ -100,9 +104,13 @@ static int bcm283x_mu_serial_getc(struct udevice *dev)
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(&regs->lsr) & BCM283X_MU_LSR_TX_EMPTY))
return -EAGAIN;
@ -115,9 +123,15 @@ static int bcm283x_mu_serial_putc(struct udevice *dev, const char data)
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 = readl(&regs->lsr);
unsigned int lsr;
if (plat->disabled)
return 0;
lsr = readl(&regs->lsr);
if (input) {
WATCHDOG_RESET();