hw/gpio: Add BCM2838 GPIO stub

Signed-off-by: Sergey Kambalin <sergey.kambalin@auriga.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 20240226000259.2752893-7-sergey.kambalin@auriga.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

3 files changed, 197 insertions, 1 deletions

diff --git a/hw/gpio/bcm2838_gpio.c b/hw/gpio/bcm2838_gpio.c
new file mode 100644
index 0000000..a312490
--- /dev/null
+++ b/hw/gpio/bcm2838_gpio.c
@@ -0,0 +1,153 @@
+/*
+ * Raspberry Pi (BCM2838) GPIO Controller
+ * This implementation is based on bcm2835_gpio (hw/gpio/bcm2835_gpio.c)
+ *
+ * Copyright (c) 2022 Auriga LLC
+ *
+ * Authors:
+ *  Lotosh, Aleksey <aleksey.lotosh@auriga.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#include "qemu/osdep.h"
+#include "qemu/log.h"
+#include "qemu/module.h"
+#include "qemu/timer.h"
+#include "qapi/error.h"
+#include "hw/sysbus.h"
+#include "migration/vmstate.h"
+#include "hw/gpio/bcm2838_gpio.h"
+
+#define GPFSEL0   0x00
+#define GPFSEL1   0x04
+#define GPFSEL2   0x08
+#define GPFSEL3   0x0C
+#define GPFSEL4   0x10
+#define GPFSEL5   0x14
+#define GPSET0    0x1C
+#define GPSET1    0x20
+#define GPCLR0    0x28
+#define GPCLR1    0x2C
+#define GPLEV0    0x34
+#define GPLEV1    0x38
+#define GPEDS0    0x40
+#define GPEDS1    0x44
+#define GPREN0    0x4C
+#define GPREN1    0x50
+#define GPFEN0    0x58
+#define GPFEN1    0x5C
+#define GPHEN0    0x64
+#define GPHEN1    0x68
+#define GPLEN0    0x70
+#define GPLEN1    0x74
+#define GPAREN0   0x7C
+#define GPAREN1   0x80
+#define GPAFEN0   0x88
+#define GPAFEN1   0x8C
+
+#define GPIO_PUP_PDN_CNTRL_REG0 0xE4
+#define GPIO_PUP_PDN_CNTRL_REG1 0xE8
+#define GPIO_PUP_PDN_CNTRL_REG2 0xEC
+#define GPIO_PUP_PDN_CNTRL_REG3 0xF0
+
+#define RESET_VAL_CNTRL_REG0 0xAAA95555
+#define RESET_VAL_CNTRL_REG1 0xA0AAAAAA
+#define RESET_VAL_CNTRL_REG2 0x50AAA95A
+#define RESET_VAL_CNTRL_REG3 0x00055555
+
+#define BYTES_IN_WORD        4
+
+static uint64_t bcm2838_gpio_read(void *opaque, hwaddr offset, unsigned size)
+{
+    uint64_t value = 0;
+
+    qemu_log_mask(LOG_UNIMP, "%s: %s: not implemented for %"HWADDR_PRIx"\n",
+                  TYPE_BCM2838_GPIO, __func__, offset);
+
+    return value;
+}
+
+static void bcm2838_gpio_write(void *opaque, hwaddr offset, uint64_t value,
+                               unsigned size)
+{
+    qemu_log_mask(LOG_UNIMP, "%s: %s: not implemented for %"HWADDR_PRIx"\n",
+                  TYPE_BCM2838_GPIO, __func__, offset);
+}
+
+static void bcm2838_gpio_reset(DeviceState *dev)
+{
+    BCM2838GpioState *s = BCM2838_GPIO(dev);
+
+    s->lev0 = 0;
+    s->lev1 = 0;
+
+    memset(s->fsel, 0, sizeof(s->fsel));
+
+    s->pup_cntrl_reg[0] = RESET_VAL_CNTRL_REG0;
+    s->pup_cntrl_reg[1] = RESET_VAL_CNTRL_REG1;
+    s->pup_cntrl_reg[2] = RESET_VAL_CNTRL_REG2;
+    s->pup_cntrl_reg[3] = RESET_VAL_CNTRL_REG3;
+}
+
+static const MemoryRegionOps bcm2838_gpio_ops = {
+    .read = bcm2838_gpio_read,
+    .write = bcm2838_gpio_write,
+    .endianness = DEVICE_NATIVE_ENDIAN,
+};
+
+static const VMStateDescription vmstate_bcm2838_gpio = {
+    .name = "bcm2838_gpio",
+    .version_id = 1,
+    .minimum_version_id = 1,
+    .fields = (VMStateField[]) {
+        VMSTATE_UINT8_ARRAY(fsel, BCM2838GpioState, BCM2838_GPIO_NUM),
+        VMSTATE_UINT32(lev0, BCM2838GpioState),
+        VMSTATE_UINT32(lev1, BCM2838GpioState),
+        VMSTATE_UINT8(sd_fsel, BCM2838GpioState),
+        VMSTATE_UINT32_ARRAY(pup_cntrl_reg, BCM2838GpioState,
+                             GPIO_PUP_PDN_CNTRL_NUM),
+        VMSTATE_END_OF_LIST()
+    }
+};
+
+static void bcm2838_gpio_init(Object *obj)
+{
+    BCM2838GpioState *s = BCM2838_GPIO(obj);
+    DeviceState *dev = DEVICE(obj);
+    SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
+
+    memory_region_init_io(&s->iomem, obj, &bcm2838_gpio_ops, s,
+                          "bcm2838_gpio", BCM2838_GPIO_REGS_SIZE);
+    sysbus_init_mmio(sbd, &s->iomem);
+    qdev_init_gpio_out(dev, s->out, BCM2838_GPIO_NUM);
+}
+
+static void bcm2838_gpio_realize(DeviceState *dev, Error **errp)
+{
+    /* Temporary stub. Do nothing */
+}
+
+static void bcm2838_gpio_class_init(ObjectClass *klass, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(klass);
+
+    dc->vmsd = &vmstate_bcm2838_gpio;
+    dc->realize = &bcm2838_gpio_realize;
+    dc->reset = &bcm2838_gpio_reset;
+}
+
+static const TypeInfo bcm2838_gpio_info = {
+    .name          = TYPE_BCM2838_GPIO,
+    .parent        = TYPE_SYS_BUS_DEVICE,
+    .instance_size = sizeof(BCM2838GpioState),
+    .instance_init = bcm2838_gpio_init,
+    .class_init    = bcm2838_gpio_class_init,
+};
+
+static void bcm2838_gpio_register_types(void)
+{
+    type_register_static(&bcm2838_gpio_info);
+}
+
+type_init(bcm2838_gpio_register_types)
diff --git a/hw/gpio/meson.build b/hw/gpio/meson.build
index 066ea96..8a8d03d 100644
--- a/hw/gpio/meson.build
+++ b/hw/gpio/meson.build
@@ -9,6 +9,9 @@ system_ss.add(when: 'CONFIG_IMX', if_true: files('imx_gpio.c'))
 system_ss.add(when: 'CONFIG_NPCM7XX', if_true: files('npcm7xx_gpio.c'))
 system_ss.add(when: 'CONFIG_NRF51_SOC', if_true: files('nrf51_gpio.c'))
 system_ss.add(when: 'CONFIG_OMAP', if_true: files('omap_gpio.c'))
-system_ss.add(when: 'CONFIG_RASPI', if_true: files('bcm2835_gpio.c'))
+system_ss.add(when: 'CONFIG_RASPI', if_true: files(
+    'bcm2835_gpio.c',
+    'bcm2838_gpio.c'
+))
 system_ss.add(when: 'CONFIG_ASPEED_SOC', if_true: files('aspeed_gpio.c'))
 system_ss.add(when: 'CONFIG_SIFIVE_GPIO', if_true: files('sifive_gpio.c'))
diff --git a/include/hw/gpio/bcm2838_gpio.h b/include/hw/gpio/bcm2838_gpio.h
new file mode 100644
index 0000000..06d48e0
--- /dev/null
+++ b/include/hw/gpio/bcm2838_gpio.h
@@ -0,0 +1,40 @@
+/*
+ * Raspberry Pi (BCM2838) GPIO Controller
+ * This implementation is based on bcm2835_gpio (hw/gpio/bcm2835_gpio.c)
+ *
+ * Copyright (c) 2022 Auriga LLC
+ *
+ * Authors:
+ *  Lotosh, Aleksey <aleksey.lotosh@auriga.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ */
+
+#ifndef BCM2838_GPIO_H
+#define BCM2838_GPIO_H
+
+#include "hw/sysbus.h"
+#include "qom/object.h"
+
+#define TYPE_BCM2838_GPIO "bcm2838-gpio"
+OBJECT_DECLARE_SIMPLE_TYPE(BCM2838GpioState, BCM2838_GPIO)
+
+#define BCM2838_GPIO_REGS_SIZE 0x1000
+#define BCM2838_GPIO_NUM       58
+#define GPIO_PUP_PDN_CNTRL_NUM 4
+
+struct BCM2838GpioState {
+    SysBusDevice parent_obj;
+
+    MemoryRegion iomem;
+
+
+    uint8_t fsel[BCM2838_GPIO_NUM];
+    uint32_t lev0, lev1;
+    uint8_t sd_fsel;
+    qemu_irq out[BCM2838_GPIO_NUM];
+    uint32_t pup_cntrl_reg[GPIO_PUP_PDN_CNTRL_NUM];
+};
+
+#endif