[RFC PATCH v3 3/3] rpi4: add a mapping for the PCIe XHCI controller MMIO registers (ARM 32bit)

[Marek Szyprowski]

Create a non-cacheable mapping for the 0x600000000 physical memory region,
where MMIO registers for the PCIe XHCI controller are instantiated by the
PCIe bridge. Due to 32bit limit in the CPU virtual address space in ARM
32bit mode, this region is mapped at 0xff800000 CPU virtual address.

Signed-off-by: Marek Szyprowski <m.szyprowski at samsung.com>
---
 arch/arm/mach-bcm283x/Kconfig             |  1 +
 arch/arm/mach-bcm283x/include/mach/base.h |  8 ++++++++
 arch/arm/mach-bcm283x/init.c              | 20 ++++++++++++++++++++
 include/configs/rpi.h                     |  7 +++++++
 4 files changed, 36 insertions(+)

diff --git a/arch/arm/mach-bcm283x/Kconfig b/arch/arm/mach-bcm283x/Kconfig
index 00419bf..bcb7f1d 100644
--- a/arch/arm/mach-bcm283x/Kconfig
+++ b/arch/arm/mach-bcm283x/Kconfig
@@ -36,6 +36,7 @@ config BCM2711_32B
 	select BCM2711
 	select ARMV7_LPAE
 	select CPU_V7A
+	select PHYS_64BIT
 
 config BCM2711_64B
 	bool "Broadcom BCM2711 SoC 64-bit support"
diff --git a/arch/arm/mach-bcm283x/include/mach/base.h b/arch/arm/mach-bcm283x/include/mach/base.h
index c4ae398..4ccaf69 100644
--- a/arch/arm/mach-bcm283x/include/mach/base.h
+++ b/arch/arm/mach-bcm283x/include/mach/base.h
@@ -8,4 +8,12 @@
 
 extern unsigned long rpi_bcm283x_base;
 
+#ifdef CONFIG_ARMV7_LPAE
+#ifdef CONFIG_TARGET_RPI_4_32B
+#include <addr_map.h>
+#define phys_to_virt addrmap_phys_to_virt
+#define virt_to_phys addrmap_virt_to_phys
+#endif
+#endif
+
 #endif
diff --git a/arch/arm/mach-bcm283x/init.c b/arch/arm/mach-bcm283x/init.c
index 9f5bca3..008b312 100644
--- a/arch/arm/mach-bcm283x/init.c
+++ b/arch/arm/mach-bcm283x/init.c
@@ -145,6 +145,26 @@ int mach_cpu_init(void)
 }
 
 #ifdef CONFIG_ARMV7_LPAE
+#ifdef CONFIG_TARGET_RPI_4_32B
+#define BCM2711_RPI4_PCIE_XHCI_MMIO_VIRT	0xff800000UL
+#include <addr_map.h>
+
+void init_addr_map(void)
+{
+	mmu_set_region_dcache_behaviour_phys(BCM2711_RPI4_PCIE_XHCI_MMIO_VIRT,
+					     BCM2711_RPI4_PCIE_XHCI_MMIO_PHYS,
+					     BCM2711_RPI4_PCIE_XHCI_MMIO_SIZE,
+					     DCACHE_OFF);
+
+	/* identity mapping for 0..BCM2711_RPI4_PCIE_XHCI_MMIO_VIRT */
+	addrmap_set_entry(0, 0, BCM2711_RPI4_PCIE_XHCI_MMIO_VIRT, 0);
+	/* XHCI MMIO on PCIe at BCM2711_RPI4_PCIE_XHCI_MMIO_VIRT */
+	addrmap_set_entry(BCM2711_RPI4_PCIE_XHCI_MMIO_VIRT,
+			  BCM2711_RPI4_PCIE_XHCI_MMIO_PHYS,
+			  BCM2711_RPI4_PCIE_XHCI_MMIO_SIZE, 1);
+}
+#endif
+
 void enable_caches(void)
 {
 	dcache_enable();
diff --git a/include/configs/rpi.h b/include/configs/rpi.h
index b53a4b6..296e8ee 100644
--- a/include/configs/rpi.h
+++ b/include/configs/rpi.h
@@ -63,6 +63,13 @@
 #define CONFIG_SYS_BOOTM_LEN		SZ_64M
 #endif
 
+#ifdef CONFIG_ARMV7_LPAE
+#ifdef CONFIG_TARGET_RPI_4_32B
+#define CONFIG_ADDR_MAP 1
+#define CONFIG_SYS_NUM_ADDR_MAP 2
+#endif
+#endif
+
 /* Devices */
 /* GPIO */
 #define CONFIG_BCM2835_GPIO
-- 
1.9.1