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-rw-r--r--drivers/tty/serial/mvebu-uart.c131
1 files changed, 119 insertions, 12 deletions
diff --git a/drivers/tty/serial/mvebu-uart.c b/drivers/tty/serial/mvebu-uart.c
index e52248ec2689..d0e749f6f052 100644
--- a/drivers/tty/serial/mvebu-uart.c
+++ b/drivers/tty/serial/mvebu-uart.c
@@ -79,7 +79,16 @@
#define MVEBU_UART_TYPE "mvebu-uart"
#define DRIVER_NAME "mvebu_serial"
-/* Register offsets, different depending on the UART */
+enum {
+ /* Either there is only one summed IRQ... */
+ UART_IRQ_SUM = 0,
+ /* ...or there are two separate IRQ for RX and TX */
+ UART_RX_IRQ = 0,
+ UART_TX_IRQ,
+ UART_IRQ_COUNT
+};
+
+/* Diverging register offsets */
struct uart_regs_layout {
unsigned int rbr;
unsigned int tsh;
@@ -106,6 +115,8 @@ struct mvebu_uart_driver_data {
struct mvebu_uart {
struct uart_port *port;
struct clk *clk;
+ int irq[UART_IRQ_COUNT];
+ unsigned char __iomem *nb;
struct mvebu_uart_driver_data *data;
};
@@ -313,9 +324,32 @@ static irqreturn_t mvebu_uart_isr(int irq, void *dev_id)
unsigned int st = readl(port->membase + UART_STAT);
if (st & (STAT_RX_RDY(port) | STAT_OVR_ERR | STAT_FRM_ERR |
+ STAT_BRK_DET))
+ mvebu_uart_rx_chars(port, st);
+
+ if (st & STAT_TX_RDY(port))
+ mvebu_uart_tx_chars(port, st);
+
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t mvebu_uart_rx_isr(int irq, void *dev_id)
+{
+ struct uart_port *port = (struct uart_port *)dev_id;
+ unsigned int st = readl(port->membase + UART_STAT);
+
+ if (st & (STAT_RX_RDY(port) | STAT_OVR_ERR | STAT_FRM_ERR |
STAT_BRK_DET))
mvebu_uart_rx_chars(port, st);
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t mvebu_uart_tx_isr(int irq, void *dev_id)
+{
+ struct uart_port *port = (struct uart_port *)dev_id;
+ unsigned int st = readl(port->membase + UART_STAT);
+
if (st & STAT_TX_RDY(port))
mvebu_uart_tx_chars(port, st);
@@ -324,6 +358,7 @@ static irqreturn_t mvebu_uart_isr(int irq, void *dev_id)
static int mvebu_uart_startup(struct uart_port *port)
{
+ struct mvebu_uart *mvuart = to_mvuart(port);
unsigned int ctl;
int ret;
@@ -342,11 +377,38 @@ static int mvebu_uart_startup(struct uart_port *port)
ctl |= CTRL_RX_RDY_INT(port);
writel(ctl, port->membase + UART_INTR(port));
- ret = request_irq(port->irq, mvebu_uart_isr, port->irqflags,
- DRIVER_NAME, port);
- if (ret) {
- dev_err(port->dev, "failed to request irq\n");
- return ret;
+ if (!mvuart->irq[UART_TX_IRQ]) {
+ /* Old bindings with just one interrupt (UART0 only) */
+ ret = devm_request_irq(port->dev, mvuart->irq[UART_IRQ_SUM],
+ mvebu_uart_isr, port->irqflags,
+ dev_name(port->dev), port);
+ if (ret) {
+ dev_err(port->dev, "unable to request IRQ %d\n",
+ mvuart->irq[UART_IRQ_SUM]);
+ return ret;
+ }
+ } else {
+ /* New bindings with an IRQ for RX and TX (both UART) */
+ ret = devm_request_irq(port->dev, mvuart->irq[UART_RX_IRQ],
+ mvebu_uart_rx_isr, port->irqflags,
+ dev_name(port->dev), port);
+ if (ret) {
+ dev_err(port->dev, "unable to request IRQ %d\n",
+ mvuart->irq[UART_RX_IRQ]);
+ return ret;
+ }
+
+ ret = devm_request_irq(port->dev, mvuart->irq[UART_TX_IRQ],
+ mvebu_uart_tx_isr, port->irqflags,
+ dev_name(port->dev),
+ port);
+ if (ret) {
+ dev_err(port->dev, "unable to request IRQ %d\n",
+ mvuart->irq[UART_TX_IRQ]);
+ devm_free_irq(port->dev, mvuart->irq[UART_RX_IRQ],
+ port);
+ return ret;
+ }
}
return 0;
@@ -354,9 +416,16 @@ static int mvebu_uart_startup(struct uart_port *port)
static void mvebu_uart_shutdown(struct uart_port *port)
{
+ struct mvebu_uart *mvuart = to_mvuart(port);
+
writel(0, port->membase + UART_INTR(port));
- free_irq(port->irq, port);
+ if (!mvuart->irq[UART_TX_IRQ]) {
+ devm_free_irq(port->dev, mvuart->irq[UART_IRQ_SUM], port);
+ } else {
+ devm_free_irq(port->dev, mvuart->irq[UART_RX_IRQ], port);
+ devm_free_irq(port->dev, mvuart->irq[UART_TX_IRQ], port);
+ }
}
static int mvebu_uart_baud_rate_set(struct uart_port *port, unsigned int baud)
@@ -661,15 +730,14 @@ static int uart_num_counter;
static int mvebu_uart_probe(struct platform_device *pdev)
{
struct resource *reg = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- struct resource *irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
const struct of_device_id *match = of_match_device(mvebu_uart_of_match,
&pdev->dev);
struct uart_port *port;
struct mvebu_uart *mvuart;
- int ret, id;
+ int ret, id, irq;
- if (!reg || !irq) {
- dev_err(&pdev->dev, "no registers/irq defined\n");
+ if (!reg) {
+ dev_err(&pdev->dev, "no registers defined\n");
return -EINVAL;
}
@@ -700,7 +768,12 @@ static int mvebu_uart_probe(struct platform_device *pdev)
port->flags = UPF_FIXED_PORT;
port->line = pdev->id;
- port->irq = irq->start;
+ /*
+ * IRQ number is not stored in this structure because we may have two of
+ * them per port (RX and TX). Instead, use the driver UART structure
+ * array so called ->irq[].
+ */
+ port->irq = 0;
port->irqflags = 0;
port->mapbase = reg->start;
@@ -735,6 +808,40 @@ static int mvebu_uart_probe(struct platform_device *pdev)
port->uartclk = clk_get_rate(mvuart->clk);
}
+ /* Manage interrupts */
+ memset(mvuart->irq, 0, UART_IRQ_COUNT);
+ if (platform_irq_count(pdev) == 1) {
+ /* Old bindings: no name on the single unamed UART0 IRQ */
+ irq = platform_get_irq(pdev, 0);
+ if (irq < 0) {
+ dev_err(&pdev->dev, "unable to get UART IRQ\n");
+ return irq;
+ }
+
+ mvuart->irq[UART_IRQ_SUM] = irq;
+ } else {
+ /*
+ * New bindings: named interrupts (RX, TX) for both UARTS,
+ * only make use of uart-rx and uart-tx interrupts, do not use
+ * uart-sum of UART0 port.
+ */
+ irq = platform_get_irq_byname(pdev, "uart-rx");
+ if (irq < 0) {
+ dev_err(&pdev->dev, "unable to get 'uart-rx' IRQ\n");
+ return irq;
+ }
+
+ mvuart->irq[UART_RX_IRQ] = irq;
+
+ irq = platform_get_irq_byname(pdev, "uart-tx");
+ if (irq < 0) {
+ dev_err(&pdev->dev, "unable to get 'uart-tx' IRQ\n");
+ return irq;
+ }
+
+ mvuart->irq[UART_TX_IRQ] = irq;
+ }
+
/* UART Soft Reset*/
writel(CTRL_SOFT_RST, port->membase + UART_CTRL(port));
udelay(1);
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-11 22:10:44 +0000