Change in coreboot[master]: console/flashconsole: Add support for tx_flush

[Youness Alaoui (Code Review)]

Youness Alaoui has uploaded a new change for review. ( https://review.coreboot.org/19865 )

Change subject: console/flashconsole: Add support for tx_flush
......................................................................

console/flashconsole: Add support for tx_flush

Support flushing the flash console so non \n terminated lines can
be printed to flash. Also use it internally when the line buffering
is done.

Change-Id: I6516ecefddf676bdac6fb97536a08a5c5ecc0d4d
Signed-off-by: Youness Alaoui 
---
M src/console/console.c
M src/drivers/spi/flashconsole.c
M src/include/console/flash.h
3 files changed, 46 insertions(+), 15 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/65/19865/1

diff --git a/src/console/console.c b/src/console/console.c
index 2b7f99d..877c8dc 100644
--- a/src/console/console.c
+++ b/src/console/console.c
@@ -63,6 +63,7 @@
    __uart_tx_flush();
    __ne2k_tx_flush();
    __usb_tx_flush();
+	__flashconsole_tx_flush();
 }

void console_write_line(uint8_t *buffer, size_t number_of_bytes)
diff --git a/src/drivers/spi/flashconsole.c b/src/drivers/spi/flashconsole.c
index 29680a2..b9b8877 100644
--- a/src/drivers/spi/flashconsole.c
+++ b/src/drivers/spi/flashconsole.c
@@ -98,7 +98,30 @@
    memset(line_buffer, 0, LINE_BUFFER_SIZE);
    // Set g_rdev last so tx_byte doesn't get executed early
    car_set_var(g_rdev, rdev);
+}

+static const struct region_device *_tx_flush(const struct region_device *rdev)
+{
+	uint8_t *line_buffer = car_get_var_ptr(g_line_buffer);
+	uint32_t offset = car_get_var(g_offset);
+	uint32_t region_offset = car_get_var(g_region_offset);
+	uint32_t region_size = car_get_var(g_region_size);
+	uint32_t len = car_get_var(g_line_offset);
+
+	// We crop the rest of the line if the region is full
+	if (offset + len >= region_size)
+		len = region_size - offset;
+
+	rdev_writeat(rdev, line_buffer, region_offset + offset, len);
+
+	// If the region is full, stop future write attempts
+	if (offset + len >= region_size)
+		rdev = NULL;
+
+	car_set_var(g_offset, offset + len);
+	car_set_var(g_line_offset, 0);
+
+	return rdev;
 }

void flashconsole_tx_byte(unsigned char c)
@@ -123,22 +146,23 @@

if (len >= LINE_BUFFER_SIZE - 1 ||
    		offset + len >= region_size || c == '\n') {
-			uint32_t region_offset = car_get_var(g_region_offset);
-
-			// We crop the rest of the line if the region is full
-			if (offset + len >= region_size)
-				len = region_size - offset;
-
-			rdev_writeat(rdev, line_buffer, region_offset + offset,
-				len);
-
-			// If the region is full, stop future write attempts
-			if (offset + len >= region_size)
-				rdev = NULL;
-
-			car_set_var(g_offset, offset + len);
-			car_set_var(g_line_offset, 0);
+			rdev = _tx_flush(rdev);
    	}
    	car_set_var(g_rdev, rdev);
    }
+
+}
+
+void flashconsole_tx_flush(void)
+{
+	const struct region_device *rdev = car_get_var(g_rdev);
+
+	if (rdev) {
+		/* Prevent any recursive loops in case the spi flash driver
+		 * calls printk (in case of transaction timeout or
+		 * any other error while writing) */
+		car_set_var(g_rdev, NULL);
+		rdev = _tx_flush(rdev);
+		car_set_var(g_rdev, rdev);
+	}
 }
diff --git a/src/include/console/flash.h b/src/include/console/flash.h
index fa4de00..7bf0c93 100644
--- a/src/include/console/flash.h
+++ b/src/include/console/flash.h
@@ -21,6 +21,7 @@

void flashconsole_init(void);
 void flashconsole_tx_byte(unsigned char c);
+void flashconsole_tx_flush(void);

#define __CONSOLE_FLASH_ENABLE__	IS_ENABLED(CONFIG_CONSOLE_SPI_FLASH)

@@ -30,9 +31,14 @@
 {
    flashconsole_tx_byte(data);
 }
+static inline void __flashconsole_tx_flush(void)
+{
+	flashconsole_tx_flush();
+}
 #else
 static inline void __flashconsole_init(void)	{}
 static inline void __flashconsole_tx_byte(u8 data)	{}
+static inline void __flashconsole_tx_flush(void) {}
 #endif /* __CONSOLE_FLASH_ENABLE__ */