1 files changed, 165 insertions, 19 deletions

diff --git a/drivers/serial/cpm_uart/cpm_uart_core.c b/drivers/serial/cpm_uart/cpm_uart_core.c
index abe129cc927..25efca5a7a1 100644
--- a/drivers/serial/cpm_uart/cpm_uart_core.c
+++ b/drivers/serial/cpm_uart/cpm_uart_core.c
@@ -43,6 +43,9 @@
 #include <linux/dma-mapping.h>
 #include <linux/fs_uart_pd.h>
 #include <linux/of_platform.h>
+#include <linux/gpio.h>
+#include <linux/of_gpio.h>
+#include <linux/clk.h>
 
 #include <asm/io.h>
 #include <asm/irq.h>
@@ -96,13 +99,41 @@ static unsigned int cpm_uart_tx_empty(struct uart_port *port)
 
 static void cpm_uart_set_mctrl(struct uart_port *port, unsigned int mctrl)
 {
-	/* Whee. Do nothing. */
+	struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
+
+	if (pinfo->gpios[GPIO_RTS] >= 0)
+		gpio_set_value(pinfo->gpios[GPIO_RTS], !(mctrl & TIOCM_RTS));
+
+	if (pinfo->gpios[GPIO_DTR] >= 0)
+		gpio_set_value(pinfo->gpios[GPIO_DTR], !(mctrl & TIOCM_DTR));
 }
 
 static unsigned int cpm_uart_get_mctrl(struct uart_port *port)
 {
-	/* Whee. Do nothing. */
-	return TIOCM_CAR | TIOCM_DSR | TIOCM_CTS;
+	struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
+	unsigned int mctrl = TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
+
+	if (pinfo->gpios[GPIO_CTS] >= 0) {
+		if (gpio_get_value(pinfo->gpios[GPIO_CTS]))
+			mctrl &= ~TIOCM_CTS;
+	}
+
+	if (pinfo->gpios[GPIO_DSR] >= 0) {
+		if (gpio_get_value(pinfo->gpios[GPIO_DSR]))
+			mctrl &= ~TIOCM_DSR;
+	}
+
+	if (pinfo->gpios[GPIO_DCD] >= 0) {
+		if (gpio_get_value(pinfo->gpios[GPIO_DCD]))
+			mctrl &= ~TIOCM_CAR;
+	}
+
+	if (pinfo->gpios[GPIO_RI] >= 0) {
+		if (!gpio_get_value(pinfo->gpios[GPIO_RI]))
+			mctrl |= TIOCM_RNG;
+	}
+
+	return mctrl;
 }
 
 /*
@@ -201,6 +232,10 @@ static void cpm_uart_int_tx(struct uart_port *port)
 	cpm_uart_tx_pump(port);
 }
 
+#ifdef CONFIG_CONSOLE_POLL
+static int serial_polled;
+#endif
+
 /*
  * Receive characters
  */
@@ -209,7 +244,7 @@ static void cpm_uart_int_rx(struct uart_port *port)
 	int i;
 	unsigned char ch;
 	u8 *cp;
-	struct tty_struct *tty = port->info->tty;
+	struct tty_struct *tty = port->info->port.tty;
 	struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
 	cbd_t __iomem *bdp;
 	u16 status;
@@ -222,6 +257,12 @@ static void cpm_uart_int_rx(struct uart_port *port)
 	 */
 	bdp = pinfo->rx_cur;
 	for (;;) {
+#ifdef CONFIG_CONSOLE_POLL
+		if (unlikely(serial_polled)) {
+			serial_polled = 0;
+			return;
+		}
+#endif
 		/* get status */
 		status = in_be16(&bdp->cbd_sc);
 		/* If this one is empty, return happy */
@@ -253,7 +294,12 @@ static void cpm_uart_int_rx(struct uart_port *port)
 				goto handle_error;
 			if (uart_handle_sysrq_char(port, ch))
 				continue;
-
+#ifdef CONFIG_CONSOLE_POLL
+			if (unlikely(serial_polled)) {
+				serial_polled = 0;
+				return;
+			}
+#endif
 		      error_return:
 			tty_insert_flip_char(tty, ch, flg);
 
@@ -420,10 +466,13 @@ static void cpm_uart_shutdown(struct uart_port *port)
 		}
 
 		/* Shut them really down and reinit buffer descriptors */
-		if (IS_SMC(pinfo))
+		if (IS_SMC(pinfo)) {
+			out_be16(&pinfo->smcup->smc_brkcr, 0);
 			cpm_line_cr_cmd(pinfo, CPM_CR_STOP_TX);
-		else
+		} else {
+			out_be16(&pinfo->sccup->scc_brkcr, 0);
 			cpm_line_cr_cmd(pinfo, CPM_CR_GRA_STOP_TX);
+		}
 
 		cpm_uart_initbd(pinfo);
 	}
@@ -539,14 +588,19 @@ static void cpm_uart_set_termios(struct uart_port *port,
 		 * enables, because we want to put them back if they were
 		 * present.
 		 */
-		prev_mode = in_be16(&smcp->smc_smcmr);
-		out_be16(&smcp->smc_smcmr, smcr_mk_clen(bits) | cval | SMCMR_SM_UART);
-		setbits16(&smcp->smc_smcmr, (prev_mode & (SMCMR_REN | SMCMR_TEN)));
+		prev_mode = in_be16(&smcp->smc_smcmr) & (SMCMR_REN | SMCMR_TEN);
+		/* Output in *one* operation, so we don't interrupt RX/TX if they
+		 * were already enabled. */
+		out_be16(&smcp->smc_smcmr, smcr_mk_clen(bits) | cval |
+		    SMCMR_SM_UART | prev_mode);
 	} else {
 		out_be16(&sccp->scc_psmr, (sbits << 12) | scval);
 	}
 
-	cpm_set_brg(pinfo->brg - 1, baud);
+	if (pinfo->clk)
+		clk_set_rate(pinfo->clk, baud);
+	else
+		cpm_set_brg(pinfo->brg - 1, baud);
 	spin_unlock_irqrestore(&port->lock, flags);
 }
 
@@ -865,6 +919,80 @@ static void cpm_uart_config_port(struct uart_port *port, int flags)
 		cpm_uart_request_port(port);
 	}
 }
+
+#ifdef CONFIG_CONSOLE_POLL
+/* Serial polling routines for writing and reading from the uart while
+ * in an interrupt or debug context.
+ */
+
+#define GDB_BUF_SIZE	512	/* power of 2, please */
+
+static char poll_buf[GDB_BUF_SIZE];
+static char *pollp;
+static int poll_chars;
+
+static int poll_wait_key(char *obuf, struct uart_cpm_port *pinfo)
+{
+	u_char		c, *cp;
+	volatile cbd_t	*bdp;
+	int		i;
+
+	/* Get the address of the host memory buffer.
+	 */
+	bdp = pinfo->rx_cur;
+	while (bdp->cbd_sc & BD_SC_EMPTY)
+		;
+
+	/* If the buffer address is in the CPM DPRAM, don't
+	 * convert it.
+	 */
+	cp = cpm2cpu_addr(bdp->cbd_bufaddr, pinfo);
+
+	if (obuf) {
+		i = c = bdp->cbd_datlen;
+		while (i-- > 0)
+			*obuf++ = *cp++;
+	} else
+		c = *cp;
+	bdp->cbd_sc &= ~(BD_SC_BR | BD_SC_FR | BD_SC_PR | BD_SC_OV | BD_SC_ID);
+	bdp->cbd_sc |= BD_SC_EMPTY;
+
+	if (bdp->cbd_sc & BD_SC_WRAP)
+		bdp = pinfo->rx_bd_base;
+	else
+		bdp++;
+	pinfo->rx_cur = (cbd_t *)bdp;
+
+	return (int)c;
+}
+
+static int cpm_get_poll_char(struct uart_port *port)
+{
+	struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
+
+	if (!serial_polled) {
+		serial_polled = 1;
+		poll_chars = 0;
+	}
+	if (poll_chars <= 0) {
+		poll_chars = poll_wait_key(poll_buf, pinfo);
+		pollp = poll_buf;
+	}
+	poll_chars--;
+	return *pollp++;
+}
+
+static void cpm_put_poll_char(struct uart_port *port,
+			 unsigned char c)
+{
+	struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
+	static char ch[2];
+
+	ch[0] = (char)c;
+	cpm_uart_early_write(pinfo->port.line, ch, 1);
+}
+#endif /* CONFIG_CONSOLE_POLL */
+
 static struct uart_ops cpm_uart_pops = {
 	.tx_empty	= cpm_uart_tx_empty,
 	.set_mctrl	= cpm_uart_set_mctrl,
@@ -882,6 +1010,10 @@ static struct uart_ops cpm_uart_pops = {
 	.request_port	= cpm_uart_request_port,
 	.config_port	= cpm_uart_config_port,
 	.verify_port	= cpm_uart_verify_port,
+#ifdef CONFIG_CONSOLE_POLL
+	.poll_get_char = cpm_get_poll_char,
+	.poll_put_char = cpm_put_poll_char,
+#endif
 };
 
 struct uart_cpm_port cpm_uart_ports[UART_NR];
@@ -893,14 +1025,23 @@ static int cpm_uart_init_port(struct device_node *np,
 	void __iomem *mem, *pram;
 	int len;
 	int ret;
+	int i;
 
-	data = of_get_property(np, "fsl,cpm-brg", &len);
-	if (!data || len != 4) {
-		printk(KERN_ERR "CPM UART %s has no/invalid "
-		                "fsl,cpm-brg property.\n", np->name);
-		return -EINVAL;
+	data = of_get_property(np, "clock", NULL);
+	if (data) {
+		struct clk *clk = clk_get(NULL, (const char*)data);
+		if (!IS_ERR(clk))
+			pinfo->clk = clk;
+	}
+	if (!pinfo->clk) {
+		data = of_get_property(np, "fsl,cpm-brg", &len);
+		if (!data || len != 4) {
+			printk(KERN_ERR "CPM UART %s has no/invalid "
+			                "fsl,cpm-brg property.\n", np->name);
+			return -EINVAL;
+		}
+		pinfo->brg = *data;
 	}
-	pinfo->brg = *data;
 
 	data = of_get_property(np, "fsl,cpm-command", &len);
 	if (!data || len != 4) {
@@ -952,6 +1093,9 @@ static int cpm_uart_init_port(struct device_node *np,
 		goto out_pram;
 	}
 
+	for (i = 0; i < NUM_GPIOS; i++)
+		pinfo->gpios[i] = of_get_gpio(np, i);
+
 	return cpm_uart_request_port(&pinfo->port);
 
 out_pram:
@@ -1105,12 +1249,14 @@ static int __init cpm_uart_console_setup(struct console *co, char *options)
 	udbg_putc = NULL;
 #endif
 
-	cpm_line_cr_cmd(pinfo, CPM_CR_STOP_TX);
-
 	if (IS_SMC(pinfo)) {
+		out_be16(&pinfo->smcup->smc_brkcr, 0);
+		cpm_line_cr_cmd(pinfo, CPM_CR_STOP_TX);
 		clrbits8(&pinfo->smcp->smc_smcm, SMCM_RX | SMCM_TX);
 		clrbits16(&pinfo->smcp->smc_smcmr, SMCMR_REN | SMCMR_TEN);
 	} else {
+		out_be16(&pinfo->sccup->scc_brkcr, 0);
+		cpm_line_cr_cmd(pinfo, CPM_CR_GRA_STOP_TX);
 		clrbits16(&pinfo->sccp->scc_sccm, UART_SCCM_TX | UART_SCCM_RX);
 		clrbits32(&pinfo->sccp->scc_gsmrl, SCC_GSMRL_ENR | SCC_GSMRL_ENT);
 	}