From e18e8573d1ca4acf3139e05061353494735143b2 Mon Sep 17 00:00:00 2001
From: Gregory Nutt <gnutt@nuttx.org>
Date: Wed, 18 Oct 2017 13:57:54 -0600
Subject: [PATCH] BCM2708: Allow pass parameters with AUX interrupts; Add
 mini-UART break capability.

---
 arch/arm/src/bcm2708/Kconfig        |  6 +++++
 arch/arm/src/bcm2708/bcm_aux.c      | 14 +++++++---
 arch/arm/src/bcm2708/bcm_miniuart.c | 40 +++++++++++++++++++++++++++++
 3 files changed, 57 insertions(+), 3 deletions(-)

diff --git a/arch/arm/src/bcm2708/Kconfig b/arch/arm/src/bcm2708/Kconfig
index 02bc61e46d6..51692074c11 100644
--- a/arch/arm/src/bcm2708/Kconfig
+++ b/arch/arm/src/bcm2708/Kconfig
@@ -91,6 +91,12 @@ config BCM2708_MINI_UART_OFLOWCONTROL
 	---help---
 		Enable BCM2708_MINI_UART CTS flow control
 
+config BCM2708_MINI_UART_BREAKS
+	bool "Break support"
+	default n
+	---help---
+		Support BSD style BREAK IOCTL commands
+
 endmenu # BCM2708 Mini-UART Configuration
 
 menu "BCM2708 PL011 UART Configuration"
diff --git a/arch/arm/src/bcm2708/bcm_aux.c b/arch/arm/src/bcm2708/bcm_aux.c
index b378da16741..f44b93b21eb 100644
--- a/arch/arm/src/bcm2708/bcm_aux.c
+++ b/arch/arm/src/bcm2708/bcm_aux.c
@@ -49,6 +49,12 @@
 #include "chip/bcm2708_aux.h"
 #include "bcm_aux.h"
 
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+static FAR void *g_aux_arg[3];
+
 /****************************************************************************
  * Private Functions
  ****************************************************************************/
@@ -81,21 +87,21 @@ static int bcm_aux_interrupt(int irq, FAR void *context, FAR void *arg)
 #ifdef CONFIG_BCM2708_MINI_UART
   if ((auxirq & BCM_AUX_IRQ_MU) != 0)
     {
-      (void)bcm_mu_interrupt(irq, context, arg);
+      (void)bcm_mu_interrupt(irq, context, g_aux_arg[(int)BCM_AUX_MINI_UART]);
     }
 #endif
 
 #ifdef CONFIG_BCM2708_SPI1
   if ((auxirq & BCM_AUX_IRQ_SPI1) != 0)
     {
-      (void)bcm_spi1_interrupt(irq, context, arg);
+      (void)bcm_spi1_interrupt(irq, context, g_aux_arg[(int)BCM_AUX_MINI_SPI1]);
     }
 #endif
 
 #ifdef CONFIG_BCM2708_SPI2
   if ((auxirq & BCM_AUX_IRQ_SPI2) != 0)
     {
-      (void)bcm_spi2_interrupt(irq, context, arg);
+      (void)bcm_spi2_interrupt(irq, context, g_aux_arg[(int)BCM_AUX_MINI_SPI2]);
     }
 #endif
 
@@ -178,6 +184,7 @@ void bcm_aux_enable(enum bcm_aux_peripheral_e periph, FAR void *arg)
       return;
     }
 
+  g_aux_arg[(int)periph] = arg;
   modifyreg32(BCM_AUX_ENB, 0, setbits);
 }
 
@@ -223,5 +230,6 @@ void bcm_aux_disable(enum bcm_aux_peripheral_e periph)
       return;
     }
 
+  g_aux_arg[(int)periph] = NULL;
   modifyreg32(BCM_AUX_ENB, clrbits, 0);
 }
diff --git a/arch/arm/src/bcm2708/bcm_miniuart.c b/arch/arm/src/bcm2708/bcm_miniuart.c
index d91400d17b3..a88a22a7a8f 100644
--- a/arch/arm/src/bcm2708/bcm_miniuart.c
+++ b/arch/arm/src/bcm2708/bcm_miniuart.c
@@ -511,6 +511,46 @@ static int bcm_ioctl(struct file *filep, int cmd, unsigned long arg)
       break;
 #endif /* CONFIG_SERIAL_TERMIOS */
 
+#ifdef CONFIG_BCM2708_MINI_UART_BREAKS
+    case TIOCSBRK:
+      {
+        irqstate_t flags;
+        uint8_t lcr;
+
+        /* Send a break signal */
+
+        flags = enter_critical_section();
+        lcr   = getreg8(BCM_AUX_MU_LCR);
+        lcr  |= BCM_AUX_MU_LCR_BREAK;
+        putreg8(lcd, BCM_AUX_MU_LCR);
+
+        /* Disable TX activity */
+
+        bcm_txint(dev, false);
+        leave_critical_section(flags);
+      }
+      break;
+
+    case TIOCCBRK:
+      {
+        irqstate_t flags;
+        uint8_t lcr;
+
+        /* Configure TX back to UART */
+
+        flags = enter_critical_section();
+        lcr   = getreg8(BCM_AUX_MU_LCR);
+        lcr  &= ~BCM_AUX_MU_LCR_BREAK;
+        putreg8(lcd, BCM_AUX_MU_LCR);
+
+        /* Enable further TX activity */
+
+        bcm_txint(dev, true);
+        leave_critical_section(flags);
+      }
+      break;
+#endif /* CONFIG_BCM2708_MINI_UART_BREAKS */
+
     default:
       ret = -ENOTTY;
       break;