From: Sergey Kambalin <serg.oker@gmail.com>

Signed-off-by: Sergey Kambalin <sergey.kambalin@auriga.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 20240226000259.2752893-9-sergey.kambalin@auriga.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 include/hw/gpio/bcm2838_gpio.h |  5 ++++
 hw/gpio/bcm2838_gpio.c         | 52 +++++++++++++++++++++++++++++++++-
 2 files changed, 56 insertions(+), 1 deletion(-)

diff --git a/include/hw/gpio/bcm2838_gpio.h b/include/hw/gpio/bcm2838_gpio.h
index 06d48e0c191..f2a57a697f2 100644
--- a/include/hw/gpio/bcm2838_gpio.h
+++ b/include/hw/gpio/bcm2838_gpio.h
@@ -14,6 +14,7 @@
 #ifndef BCM2838_GPIO_H
 #define BCM2838_GPIO_H
 
+#include "hw/sd/sd.h"
 #include "hw/sysbus.h"
 #include "qom/object.h"
 
@@ -29,6 +30,10 @@ struct BCM2838GpioState {
 
     MemoryRegion iomem;
 
+    /* SDBus selector */
+    SDBus sdbus;
+    SDBus *sdbus_sdhci;
+    SDBus *sdbus_sdhost;
 
     uint8_t fsel[BCM2838_GPIO_NUM];
     uint32_t lev0, lev1;
diff --git a/hw/gpio/bcm2838_gpio.c b/hw/gpio/bcm2838_gpio.c
index 69d15dbb497..2ddf62f6959 100644
--- a/hw/gpio/bcm2838_gpio.c
+++ b/hw/gpio/bcm2838_gpio.c
@@ -17,6 +17,7 @@
 #include "qapi/error.h"
 #include "hw/sysbus.h"
 #include "migration/vmstate.h"
+#include "hw/sd/sd.h"
 #include "hw/gpio/bcm2838_gpio.h"
 #include "hw/irq.h"
 
@@ -63,6 +64,16 @@
 
 #define BYTES_IN_WORD        4
 
+/* bcm,function property */
+#define BCM2838_FSEL_GPIO_IN    0
+#define BCM2838_FSEL_GPIO_OUT   1
+#define BCM2838_FSEL_ALT5       2
+#define BCM2838_FSEL_ALT4       3
+#define BCM2838_FSEL_ALT0       4
+#define BCM2838_FSEL_ALT1       5
+#define BCM2838_FSEL_ALT2       6
+#define BCM2838_FSEL_ALT3       7
+
 static uint32_t gpfsel_get(BCM2838GpioState *s, uint8_t reg)
 {
     int i;
@@ -86,6 +97,31 @@ static void gpfsel_set(BCM2838GpioState *s, uint8_t reg, uint32_t value)
             s->fsel[index] = fsel;
         }
     }
+
+    /* SD controller selection (48-53) */
+    if (s->sd_fsel != BCM2838_FSEL_GPIO_IN
+        && (s->fsel[48] == BCM2838_FSEL_GPIO_IN)
+        && (s->fsel[49] == BCM2838_FSEL_GPIO_IN)
+        && (s->fsel[50] == BCM2838_FSEL_GPIO_IN)
+        && (s->fsel[51] == BCM2838_FSEL_GPIO_IN)
+        && (s->fsel[52] == BCM2838_FSEL_GPIO_IN)
+        && (s->fsel[53] == BCM2838_FSEL_GPIO_IN)
+       ) {
+        /* SDHCI controller selected */
+        sdbus_reparent_card(s->sdbus_sdhost, s->sdbus_sdhci);
+        s->sd_fsel = BCM2838_FSEL_GPIO_IN;
+    } else if (s->sd_fsel != BCM2838_FSEL_ALT0
+               && (s->fsel[48] == BCM2838_FSEL_ALT0) /* SD_CLK_R */
+               && (s->fsel[49] == BCM2838_FSEL_ALT0) /* SD_CMD_R */
+               && (s->fsel[50] == BCM2838_FSEL_ALT0) /* SD_DATA0_R */
+               && (s->fsel[51] == BCM2838_FSEL_ALT0) /* SD_DATA1_R */
+               && (s->fsel[52] == BCM2838_FSEL_ALT0) /* SD_DATA2_R */
+               && (s->fsel[53] == BCM2838_FSEL_ALT0) /* SD_DATA3_R */
+              ) {
+        /* SDHost controller selected */
+        sdbus_reparent_card(s->sdbus_sdhci, s->sdbus_sdhost);
+        s->sd_fsel = BCM2838_FSEL_ALT0;
+    }
 }
 
 static int gpfsel_is_out(BCM2838GpioState *s, int index)
@@ -266,6 +302,11 @@ static void bcm2838_gpio_reset(DeviceState *dev)
 
     memset(s->fsel, 0, sizeof(s->fsel));
 
+    s->sd_fsel = 0;
+
+    /* SDHCI is selected by default */
+    sdbus_reparent_card(&s->sdbus, s->sdbus_sdhci);
+
     s->lev0 = 0;
     s->lev1 = 0;
 
@@ -304,6 +345,8 @@ static void bcm2838_gpio_init(Object *obj)
     DeviceState *dev = DEVICE(obj);
     SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
 
+    qbus_init(&s->sdbus, sizeof(s->sdbus), TYPE_SD_BUS, DEVICE(s), "sd-bus");
+
     memory_region_init_io(&s->iomem, obj, &bcm2838_gpio_ops, s,
                           "bcm2838_gpio", BCM2838_GPIO_REGS_SIZE);
     sysbus_init_mmio(sbd, &s->iomem);
@@ -312,7 +355,14 @@ static void bcm2838_gpio_init(Object *obj)
 
 static void bcm2838_gpio_realize(DeviceState *dev, Error **errp)
 {
-    /* Temporary stub. Do nothing */
+    BCM2838GpioState *s = BCM2838_GPIO(dev);
+    Object *obj;
+
+    obj = object_property_get_link(OBJECT(dev), "sdbus-sdhci", &error_abort);
+    s->sdbus_sdhci = SD_BUS(obj);
+
+    obj = object_property_get_link(OBJECT(dev), "sdbus-sdhost", &error_abort);
+    s->sdbus_sdhost = SD_BUS(obj);
 }
 
 static void bcm2838_gpio_class_init(ObjectClass *klass, void *data)
-- 
2.34.1