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hw/char/pl011: Support all interrupt lines 

The PL011 UART has six interrupt lines:
 * RX (receive data)
 * TX (transmit data)
 * RT (receive timeout)
 * MS (modem status)
 * E (errors)
 * combined (logical OR of all the above)

So far we have only emulated the combined interrupt line;
add support for the others, so that boards that wire them
up to different interrupt controller inputs can do so.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Peter Maydell 2019-02-21 18:17:46 +00:00
parent 694cf20999
commit a3c1ca56c0
2 changed files with 45 additions and 3 deletions
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46
hw/char/pl011.c
View File

@ -7,6 +7,17 @@
* This code is licensed under the GPL.
*/
/*
* QEMU interface:
* + sysbus MMIO region 0: device registers
* + sysbus IRQ 0: UARTINTR (combined interrupt line)
* + sysbus IRQ 1: UARTRXINTR (receive FIFO interrupt line)
* + sysbus IRQ 2: UARTTXINTR (transmit FIFO interrupt line)
* + sysbus IRQ 3: UARTRTINTR (receive timeout interrupt line)
* + sysbus IRQ 4: UARTMSINTR (momem status interrupt line)
* + sysbus IRQ 5: UARTEINTR (error interrupt line)
*/
#include "qemu/osdep.h"
#include "hw/char/pl011.h"
#include "hw/sysbus.h"
@ -22,18 +33,46 @@
#define PL011_FLAG_TXFF 0x20
#define PL011_FLAG_RXFE 0x10
/* Interrupt status bits in UARTRIS, UARTMIS, UARTIMSC */
#define INT_OE (1 << 10)
#define INT_BE (1 << 9)
#define INT_PE (1 << 8)
#define INT_FE (1 << 7)
#define INT_RT (1 << 6)
#define INT_TX (1 << 5)
#define INT_RX (1 << 4)
#define INT_DSR (1 << 3)
#define INT_DCD (1 << 2)
#define INT_CTS (1 << 1)
#define INT_RI (1 << 0)
#define INT_E (INT_OE | INT_BE | INT_PE | INT_FE)
#define INT_MS (INT_RI | INT_DSR | INT_DCD | INT_CTS)
static const unsigned char pl011_id_arm[8] =
{ 0x11, 0x10, 0x14, 0x00, 0x0d, 0xf0, 0x05, 0xb1 };
static const unsigned char pl011_id_luminary[8] =
{ 0x11, 0x00, 0x18, 0x01, 0x0d, 0xf0, 0x05, 0xb1 };
/* Which bits in the interrupt status matter for each outbound IRQ line ? */
static const uint32_t irqmask[] = {
INT_E | INT_MS | INT_RT | INT_TX | INT_RX, /* combined IRQ */
INT_RX,
INT_TX,
INT_RT,
INT_MS,
INT_E,
};
static void pl011_update(PL011State *s)
{
uint32_t flags;
int i;
flags = s->int_level & s->int_enabled;
trace_pl011_irq_state(flags != 0);
qemu_set_irq(s->irq, flags != 0);
for (i = 0; i < ARRAY_SIZE(s->irq); i++) {
qemu_set_irq(s->irq[i], (flags & irqmask[i]) != 0);
}
}
static uint64_t pl011_read(void *opaque, hwaddr offset,
@ -284,10 +323,13 @@ static void pl011_init(Object *obj)
{
SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
PL011State *s = PL011(obj);
int i;
memory_region_init_io(&s->iomem, OBJECT(s), &pl011_ops, s, "pl011", 0x1000);
sysbus_init_mmio(sbd, &s->iomem);
sysbus_init_irq(sbd, &s->irq);
for (i = 0; i < ARRAY_SIZE(s->irq); i++) {
sysbus_init_irq(sbd, &s->irq[i]);
}
s->read_trigger = 1;
s->ifl = 0x12;

2
include/hw/char/pl011.h
View File

@ -45,7 +45,7 @@ typedef struct PL011State {
int read_count;
int read_trigger;
CharBackend chr;
qemu_irq irq;
qemu_irq irq[6];
const unsigned char *id;
} PL011State;