mxc: add MX3 support for i.MX internal UART driver
This patch adds MX3 support for the i.MX internal uart driver.
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
diff --git a/drivers/serial/imx.c b/drivers/serial/imx.c
index 9e2162e..549440b 100644
--- a/drivers/serial/imx.c
+++ b/drivers/serial/imx.c
@@ -62,6 +62,11 @@
#define UBIR 0xa4 /* BRM Incremental Register */
#define UBMR 0xa8 /* BRM Modulator Register */
#define UBRC 0xac /* Baud Rate Count Register */
+#ifdef CONFIG_ARCH_MX3
+#define ONEMS 0xb0 /* One Millisecond register */
+#define UTS 0xb4 /* UART Test Register */
+#endif
+#ifdef CONFIG_ARCH_IMX
#define BIPR1 0xb0 /* Incremental Preset Register 1 */
#define BIPR2 0xb4 /* Incremental Preset Register 2 */
#define BIPR3 0xb8 /* Incremental Preset Register 3 */
@@ -71,6 +76,7 @@
#define BMPR3 0xc8 /* BRM Modulator Register 3 */
#define BMPR4 0xcc /* BRM Modulator Register 4 */
#define UTS 0xd0 /* UART Test Register */
+#endif
/* UART Control Register Bit Fields.*/
#define URXD_CHARRDY (1<<15)
@@ -90,7 +96,12 @@
#define UCR1_RTSDEN (1<<5) /* RTS delta interrupt enable */
#define UCR1_SNDBRK (1<<4) /* Send break */
#define UCR1_TDMAEN (1<<3) /* Transmitter ready DMA enable */
+#ifdef CONFIG_ARCH_IMX
#define UCR1_UARTCLKEN (1<<2) /* UART clock enabled */
+#endif
+#ifdef CONFIG_ARCH_MX3
+#define UCR1_UARTCLKEN (0) /* not present on mx2/mx3 */
+#endif
#define UCR1_DOZE (1<<1) /* Doze */
#define UCR1_UARTEN (1<<0) /* UART enabled */
#define UCR2_ESCI (1<<15) /* Escape seq interrupt enable */
@@ -164,8 +175,19 @@
#define UTS_SOFTRST (1<<0) /* Software reset */
/* We've been assigned a range on the "Low-density serial ports" major */
+#ifdef CONFIG_ARCH_IMX
#define SERIAL_IMX_MAJOR 204
#define MINOR_START 41
+#define DEV_NAME "ttySMX"
+#define MAX_INTERNAL_IRQ IMX_IRQS
+#endif
+
+#ifdef CONFIG_ARCH_MX3
+#define SERIAL_IMX_MAJOR 207
+#define MINOR_START 16
+#define DEV_NAME "ttymxc"
+#define MAX_INTERNAL_IRQ MXC_MAX_INT_LINES
+#endif
/*
* This determines how often we check the modem status signals
@@ -409,6 +431,26 @@
return IRQ_HANDLED;
}
+static irqreturn_t imx_int(int irq, void *dev_id)
+{
+ struct imx_port *sport = dev_id;
+ unsigned int sts;
+
+ sts = readl(sport->port.membase + USR1);
+
+ if (sts & USR1_RRDY)
+ imx_rxint(irq, dev_id);
+
+ if (sts & USR1_TRDY &&
+ readl(sport->port.membase + UCR1) & UCR1_TXMPTYEN)
+ imx_txint(irq, dev_id);
+
+ if (sts & USR1_RTSS)
+ imx_rtsint(irq, dev_id);
+
+ return IRQ_HANDLED;
+}
+
/*
* Return TIOCSER_TEMT when transmitter is not busy.
*/
@@ -514,21 +556,34 @@
writel(temp & ~UCR4_DREN, sport->port.membase + UCR4);
/*
- * Allocate the IRQ
+ * Allocate the IRQ(s) i.MX1 has three interrupts whereas later
+ * chips only have one interrupt.
*/
- retval = request_irq(sport->rxirq, imx_rxint, 0,
- DRIVER_NAME, sport);
- if (retval) goto error_out1;
+ if (sport->txirq > 0) {
+ retval = request_irq(sport->rxirq, imx_rxint, 0,
+ DRIVER_NAME, sport);
+ if (retval)
+ goto error_out1;
- retval = request_irq(sport->txirq, imx_txint, 0,
- DRIVER_NAME, sport);
- if (retval) goto error_out2;
+ retval = request_irq(sport->txirq, imx_txint, 0,
+ DRIVER_NAME, sport);
+ if (retval)
+ goto error_out2;
- retval = request_irq(sport->rtsirq, imx_rtsint,
- (sport->rtsirq < IMX_IRQS) ? 0 :
+ retval = request_irq(sport->rtsirq, imx_rtsint,
+ (sport->rtsirq < MAX_INTERNAL_IRQ) ? 0 :
IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
- DRIVER_NAME, sport);
- if (retval) goto error_out3;
+ DRIVER_NAME, sport);
+ if (retval)
+ goto error_out3;
+ } else {
+ retval = request_irq(sport->port.irq, imx_int, 0,
+ DRIVER_NAME, sport);
+ if (retval) {
+ free_irq(sport->port.irq, sport);
+ goto error_out1;
+ }
+ }
/*
* Finally, clear and enable interrupts
@@ -553,9 +608,11 @@
return 0;
error_out3:
- free_irq(sport->txirq, sport);
+ if (sport->txirq)
+ free_irq(sport->txirq, sport);
error_out2:
- free_irq(sport->rxirq, sport);
+ if (sport->rxirq)
+ free_irq(sport->rxirq, sport);
error_out1:
return retval;
}
@@ -573,9 +630,12 @@
/*
* Free the interrupts
*/
- free_irq(sport->rtsirq, sport);
- free_irq(sport->txirq, sport);
- free_irq(sport->rxirq, sport);
+ if (sport->txirq > 0) {
+ free_irq(sport->rtsirq, sport);
+ free_irq(sport->txirq, sport);
+ free_irq(sport->rxirq, sport);
+ } else
+ free_irq(sport->port.irq, sport);
/*
* Disable all interrupts, port and break condition.
@@ -973,7 +1033,7 @@
static struct uart_driver imx_reg;
static struct console imx_console = {
- .name = "ttySMX",
+ .name = DEV_NAME,
.write = imx_console_write,
.device = uart_console_device,
.setup = imx_console_setup,
@@ -990,7 +1050,7 @@
static struct uart_driver imx_reg = {
.owner = THIS_MODULE,
.driver_name = DRIVER_NAME,
- .dev_name = "ttySMX",
+ .dev_name = DEV_NAME,
.major = SERIAL_IMX_MAJOR,
.minor = MINOR_START,
.nr = ARRAY_SIZE(imx_ports),