tty: serial: msm: Support sysrq on uartDM devices

To properly support sysrq on uartDM hardware we need to properly
handle break characters. With the DM hardware the fifo can pack 4
characters at a time, where a break is indicated by an all zero
byte. Unfortunately, we can't differentiate between an all zero
byte for a break and an all zero byte of data, so try and do as
best we can. First unmask the RX break start interrupt and record
the interrupt when it arrives. Then while processing the fifo,
detect the break by searching for an all zero character as long
as we recently received an RX break start interrupt. This should
make sysrq work fairly well.

Cc: Frank Rowand <frank.rowand@sonymobile.com>
Cc: Daniel Thompson <daniel.thompson@linaro.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/serial/msm_serial.c b/drivers/tty/serial/msm_serial.c
index cedcc36..d44c049 100644 (file)
--- a/drivers/tty/serial/msm_serial.c
+++ b/drivers/tty/serial/msm_serial.c
@@ -54,6 +54,7 @@ struct msm_port {
        unsigned int            imr;
        int                     is_uartdm;
        unsigned int            old_snap_state;
+       bool                    break_detected;
 };
 
 static inline void wait_for_xmitr(struct uart_port *port)
@@ -126,23 +127,38 @@ static void handle_rx_dm(struct uart_port *port, unsigned int misr)
 
        while (count > 0) {
                unsigned char buf[4];
+               int sysrq, r_count, i;
 
                sr = msm_read(port, UART_SR);
                if ((sr & UART_SR_RX_READY) == 0) {
                        msm_port->old_snap_state -= count;
                        break;
                }
+
                ioread32_rep(port->membase + UARTDM_RF, buf, 1);
-               if (sr & UART_SR_RX_BREAK) {
-                       port->icount.brk++;
-                       if (uart_handle_break(port))
-                               continue;
-               } else if (sr & UART_SR_PAR_FRAME_ERR)
-                       port->icount.frame++;
+               r_count = min_t(int, count, sizeof(buf));
+
+               for (i = 0; i < r_count; i++) {
+                       char flag = TTY_NORMAL;
 
-               /* TODO: handle sysrq */
-               tty_insert_flip_string(tport, buf, min(count, 4));
-               count -= 4;
+                       if (msm_port->break_detected && buf[i] == 0) {
+                               port->icount.brk++;
+                               flag = TTY_BREAK;
+                               msm_port->break_detected = false;
+                               if (uart_handle_break(port))
+                                       continue;
+                       }
+
+                       if (!(port->read_status_mask & UART_SR_RX_BREAK))
+                               flag = TTY_NORMAL;
+
+                       spin_unlock(&port->lock);
+                       sysrq = uart_handle_sysrq_char(port, buf[i]);
+                       spin_lock(&port->lock);
+                       if (!sysrq)
+                               tty_insert_flip_char(tport, buf[i], flag);
+               }
+               count -= r_count;
        }
 
        spin_unlock(&port->lock);
@@ -291,6 +307,11 @@ static irqreturn_t msm_irq(int irq, void *dev_id)
        misr = msm_read(port, UART_MISR);
        msm_write(port, 0, UART_IMR); /* disable interrupt */
 
+       if (misr & UART_IMR_RXBREAK_START) {
+               msm_port->break_detected = true;
+               msm_write(port, UART_CR_CMD_RESET_RXBREAK_START, UART_CR);
+       }
+
        if (misr & (UART_IMR_RXLEV | UART_IMR_RXSTALE)) {
                if (msm_port->is_uartdm)
                        handle_rx_dm(port, misr);
@@ -496,7 +517,7 @@ static int msm_startup(struct uart_port *port)
 
        /* turn on RX and CTS interrupts */
        msm_port->imr = UART_IMR_RXLEV | UART_IMR_RXSTALE |
-                       UART_IMR_CURRENT_CTS;
+                       UART_IMR_CURRENT_CTS | UART_IMR_RXBREAK_START;
 
        if (msm_port->is_uartdm) {
                msm_write(port, 0xFFFFFF, UARTDM_DMRX);

diff --git a/drivers/tty/serial/msm_serial.h b/drivers/tty/serial/msm_serial.h
index 73d3abe..3e1c713 100644 (file)
--- a/drivers/tty/serial/msm_serial.h
+++ b/drivers/tty/serial/msm_serial.h
@@ -65,6 +65,7 @@
 #define UART_CR_TX_ENABLE              (1 << 2)
 #define UART_CR_RX_DISABLE             (1 << 1)
 #define UART_CR_RX_ENABLE              (1 << 0)
+#define UART_CR_CMD_RESET_RXBREAK_START        ((1 << 11) | (2 << 4))
 
 #define UART_IMR               0x0014
 #define UART_IMR_TXLEV         (1 << 0)
@@ -72,6 +73,7 @@
 #define UART_IMR_RXLEV         (1 << 4)
 #define UART_IMR_DELTA_CTS     (1 << 5)
 #define UART_IMR_CURRENT_CTS   (1 << 6)
+#define UART_IMR_RXBREAK_START (1 << 10)
 
 #define UART_IPR_RXSTALE_LAST          0x20
 #define UART_IPR_STALE_LSB             0x1F