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serial: lantiq: Add support for Lightning Mountain SoC

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This patch adds IRQ & ISR support in the driver for Lightning Mountain SoC.

Signed-off-by: Rahul Tanwar <rahul.tanwar@linux.intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@intel.com>
Link: https://lore.kernel.org/r/0df20f6e4bbf9de09c85a5c92c92e642f62f441f.1565257887.git.rahul.tanwar@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Rahul Tanwar 2019-08-08 18:02:08 +08:00 committed by Greg Kroah-Hartman
parent 14208b3890
commit b832776bbc
1 changed files with 71 additions and 0 deletions
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71
drivers/tty/serial/lantiq.c
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@ -57,6 +57,7 @@
#define ASC_IRNCR_TIR 0x1
#define ASC_IRNCR_RIR 0x2
#define ASC_IRNCR_EIR 0x4
#define ASC_IRNCR_MASK GENMASK(2, 0)
#define ASCOPT_CSIZE 0x3
#define TXFIFO_FL 1
@ -115,6 +116,7 @@ struct ltq_uart_port {
unsigned int tx_irq;
unsigned int rx_irq;
unsigned int err_irq;
unsigned int common_irq;
spinlock_t lock; /* exclusive access for multi core */
const struct ltq_soc_data *soc;
@ -293,6 +295,31 @@ lqasc_rx_int(int irq, void *_port)
return IRQ_HANDLED;
}
static irqreturn_t lqasc_irq(int irq, void *p)
{
unsigned long flags;
u32 stat;
struct uart_port *port = p;
struct ltq_uart_port *ltq_port = to_ltq_uart_port(port);
spin_lock_irqsave(&ltq_port->lock, flags);
stat = readl(port->membase + LTQ_ASC_IRNCR);
spin_unlock_irqrestore(&ltq_port->lock, flags);
if (!(stat & ASC_IRNCR_MASK))
return IRQ_NONE;
if (stat & ASC_IRNCR_TIR)
lqasc_tx_int(irq, p);
if (stat & ASC_IRNCR_RIR)
lqasc_rx_int(irq, p);
if (stat & ASC_IRNCR_EIR)
lqasc_err_int(irq, p);
return IRQ_HANDLED;
}
static unsigned int
lqasc_tx_empty(struct uart_port *port)
{
@ -677,6 +704,7 @@ lqasc_serial_early_console_setup(struct earlycon_device *device,
return 0;
}
OF_EARLYCON_DECLARE(lantiq, "lantiq,asc", lqasc_serial_early_console_setup);
OF_EARLYCON_DECLARE(lantiq, "intel,lgm-asc", lqasc_serial_early_console_setup);
static struct uart_driver lqasc_reg = {
.owner = THIS_MODULE,
@ -751,6 +779,42 @@ static void free_irq_lantiq(struct uart_port *port)
free_irq(ltq_port->err_irq, port);
}
static int fetch_irq_intel(struct device *dev, struct ltq_uart_port *ltq_port)
{
struct uart_port *port = &ltq_port->port;
int ret;
ret = of_irq_get(dev->of_node, 0);
if (ret < 0) {
dev_err(dev, "failed to fetch IRQ for serial port\n");
return ret;
}
ltq_port->common_irq = ret;
port->irq = ret;
return 0;
}
static int request_irq_intel(struct uart_port *port)
{
struct ltq_uart_port *ltq_port = to_ltq_uart_port(port);
int retval;
retval = request_irq(ltq_port->common_irq, lqasc_irq, 0,
"asc_irq", port);
if (retval)
dev_err(port->dev, "failed to request asc_irq\n");
return retval;
}
static void free_irq_intel(struct uart_port *port)
{
struct ltq_uart_port *ltq_port = to_ltq_uart_port(port);
free_irq(ltq_port->common_irq, port);
}
static int __init
lqasc_probe(struct platform_device *pdev)
{
@ -842,8 +906,15 @@ static const struct ltq_soc_data soc_data_lantiq = {
.free_irq = free_irq_lantiq,
};
static const struct ltq_soc_data soc_data_intel = {
.fetch_irq = fetch_irq_intel,
.request_irq = request_irq_intel,
.free_irq = free_irq_intel,
};
static const struct of_device_id ltq_asc_match[] = {
{ .compatible = "lantiq,asc", .data = &soc_data_lantiq },
{ .compatible = "intel,lgm-asc", .data = &soc_data_intel },
{},
};