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arm,dev: PL011 UART_FR read status enhancement

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Given we do not simulate a FIFO currently there are only two states
we can be in upon read: empty or full.  Properly signal the latter.

Add and sort constants for states in the header file.

Committed by Jason Lowe-Power <power.jg@gmail.com>
This commit is contained in:
Bjoern A. Zeeb 2016-05-19 15:19:35 -05:00
parent 5fa6b68981
commit a6b00c07f6
2 changed files with 5 additions and 2 deletions
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3
src/dev/arm/pl011.cc
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@ -91,7 +91,8 @@ Pl011::read(PacketPtr pkt)
case UART_FR:
data =
UART_FR_CTS | // Clear To Send
(!term->dataAvailable() ? UART_FR_RXFE : 0) | // RX FIFO Empty
// Given we do not simulate a FIFO we are either empty or full.
(!term->dataAvailable() ? UART_FR_RXFE : UART_FR_RXFF) |
UART_FR_TXFE; // TX FIFO empty
DPRINTF(Uart,

4
src/dev/arm/pl011.hh
View file

@ -120,8 +120,10 @@ class Pl011 : public Uart, public AmbaDevice
static const int UART_DR = 0x000;
static const int UART_FR = 0x018;
static const int UART_FR_CTS = 0x001;
static const int UART_FR_TXFE = 0x080;
static const int UART_FR_RXFE = 0x010;
static const int UART_FR_TXFF = 0x020;
static const int UART_FR_RXFF = 0x040;
static const int UART_FR_TXFE = 0x080;
static const int UART_IBRD = 0x024;
static const int UART_FBRD = 0x028;
static const int UART_LCRH = 0x02C;