morello: Add support for QEMU platform

This was tested on a baseline AArch64 Morello/QEMU without CHERI.
Basic support for a PL011 driver.

Signed-off-by: Hesham Almatary <hesham.almatary@cl.cam.ac.uk>

libplatsupport/plat_include/morello-qemu/platsupport/plat/clock.h

@@ -0,0 +1,19 @@
+/*
+ * Copyright 2017, Data61, CSIRO (ABN 41 687 119 230)
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+enum clk_id {
+    CLK_MASTER,
+    /* ----- */
+    NCLOCKS,
+    /* Custom clock */
+    CLK_CUSTOM,
+};
+
+enum clock_gate {
+    NCLKGATES
+};

libplatsupport/plat_include/morello-qemu/platsupport/plat/i2c.h

@@ -0,0 +1,11 @@
+/*
+ * Copyright 2017, Data61, CSIRO (ABN 41 687 119 230)
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+enum i2c_id {
+    NI2C
+};

libplatsupport/plat_include/morello-qemu/platsupport/plat/serial.h

@@ -0,0 +1,22 @@
+/*
+ * Copyright 2019, Data61, CSIRO (ABN 41 687 119 230)
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#define UART0_PADDR  0x9000000
+
+#define UART0_IRQ    33
+
+enum chardev_id {
+    PL001_UART0,
+    /* Aliases */
+    PS_SERIAL0 = PL001_UART0,
+    /* defaults */
+    PS_SERIAL_DEFAULT = PL001_UART0
+};
+
+#define DEFAULT_SERIAL_PADDR        UART0_PADDR
+#define DEFAULT_SERIAL_INTERRUPT    UART0_IRQ

libplatsupport/src/plat/morello-qemu/chardev.c

@@ -0,0 +1,41 @@
+/*
+ * Copyright 2019, Data61, CSIRO (ABN 41 687 119 230)
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+/**
+ * Contains the definition for all character devices on this platform.
+ * Currently this is just a simple patch.
+ */
+
+#include "../../chardev.h"
+#include "../../common.h"
+#include <utils/util.h>
+
+#include "../../chardev.h"
+
+static const int uart0_irqs[] = {UART0_IRQ, -1};
+
+#define UART_DEFN(devid) {          \
+    .id      = PL001_UART##devid,    \
+    .paddr   = UART##devid##_PADDR, \
+    .size    = BIT(12),             \
+    .irqs    = uart##devid##_irqs,  \
+    .init_fn = &uart_init           \
+}
+
+static const struct dev_defn dev_defn[] = {
+    UART_DEFN(0),
+};
+
+struct ps_chardevice *ps_cdev_init(enum chardev_id id, const ps_io_ops_t *o, struct ps_chardevice *d)
+{
+    unsigned int i;
+    for (i = 0; i < ARRAY_SIZE(dev_defn); i++) {
+        if (dev_defn[i].id == id) {
+            return (dev_defn[i].init_fn(dev_defn + i, o, d)) ? NULL : d;
+        }
+    }
+    return NULL;
+}

libplatsupport/src/plat/morello-qemu/serial.c

@@ -0,0 +1,74 @@
+/*
+ * Copyright 2019, Data61, CSIRO (ABN 41 687 119 230)
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+/* Mostly copy/paste from the HiKey plat.
+ * Should be moved to a common driver file for PL011 */
+
+#include <string.h>
+#include <stdlib.h>
+#include <platsupport/serial.h>
+#include "../../chardev.h"
+
+#define RHR_MASK                MASK(8)
+#define UARTDR                  0x000
+#define UARTFR                  0x018
+#define UARTIMSC                0x038
+#define UARTICR                 0x044
+#define PL011_UARTFR_TXFF       BIT(5)
+#define PL011_UARTFR_RXFE       BIT(4)
+
+#define REG_PTR(base, off)     ((volatile uint32_t *)((base) + (off)))
+
+int uart_getchar(ps_chardevice_t *d)
+{
+    int ch = EOF;
+
+    if ((*REG_PTR(d->vaddr, UARTFR) & PL011_UARTFR_RXFE) == 0) {
+        ch = *REG_PTR(d->vaddr, UARTDR) & RHR_MASK;
+    }
+    return ch;
+}
+
+int uart_putchar(ps_chardevice_t *d, int c)
+{
+    while ((*REG_PTR(d->vaddr, UARTFR) & PL011_UARTFR_TXFF) != 0);
+
+    *REG_PTR(d->vaddr, UARTDR) = c;
+    if (c == '\n' && (d->flags & SERIAL_AUTO_CR)) {
+        uart_putchar(d, '\r');
+    }
+
+    return c;
+}
+
+static void uart_handle_irq(ps_chardevice_t *dev)
+{
+    *REG_PTR(dev->vaddr, UARTICR) = 0x7f0;
+}
+
+int uart_init(const struct dev_defn *defn,
+              const ps_io_ops_t *ops,
+              ps_chardevice_t *dev)
+{
+    memset(dev, 0, sizeof(*dev));
+    void *vaddr = chardev_map(defn, ops);
+    if (vaddr == NULL) {
+        return -1;
+    }
+
+    /* Set up all the  device properties. */
+    dev->id         = defn->id;
+    dev->vaddr      = (void *)vaddr;
+    dev->read       = &uart_read;
+    dev->write      = &uart_write;
+    dev->handle_irq = &uart_handle_irq;
+    dev->irqs       = defn->irqs;
+    dev->ioops      = *ops;
+    dev->flags      = SERIAL_AUTO_CR;
+
+    *REG_PTR(dev->vaddr, UARTIMSC) = 0x50;
+    return 0;
+}