ARM: meson: add G12a support

Add support for the Amlogic G12A SoC, which is a mix between the
new physical memory mapping of AXG and the functionnalities of
the previous Amlogic GXL/GXM SoCs.

To handle the internal ethernet PHY, the Amlogic G12A SoCs now
embeds a dedicated PLL to feed the internal PHY.

Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>

3 files changed, 159 insertions, 1 deletions

diff --git a/arch/arm/mach-meson/Kconfig b/arch/arm/mach-meson/Kconfig
index 1b1d0aef0d..e29e4c0acc 100644
--- a/arch/arm/mach-meson/Kconfig
+++ b/arch/arm/mach-meson/Kconfig
@@ -41,7 +41,13 @@ config MESON_AXG
 	bool "AXG"
 	select MESON64_COMMON
 	help
-		Select this if your SoC is an A113X/D
+	  Select this if your SoC is an A113X/D
+
+config MESON_G12A
+	bool "G12A"
+	select MESON64_COMMON
+	help
+	  Select this if your SoC is an S905X/D2
 
 endchoice
 
@@ -65,6 +71,7 @@ config SYS_BOARD
 	default "p212" if MESON_GXL
 	default "q200" if MESON_GXM
 	default "s400" if MESON_AXG
+	default "u200" if MESON_G12A
 	default ""
 	help
 	  This option contains information about board name.
diff --git a/arch/arm/mach-meson/Makefile b/arch/arm/mach-meson/Makefile
index 6ddfba606b..a9e4046f80 100644
--- a/arch/arm/mach-meson/Makefile
+++ b/arch/arm/mach-meson/Makefile
@@ -5,3 +5,4 @@
 obj-y += board-common.o sm.o board-info.o
 obj-$(CONFIG_MESON_GX) += board-gx.o
 obj-$(CONFIG_MESON_AXG) += board-axg.o
+obj-$(CONFIG_MESON_G12A) += board-g12a.o
diff --git a/arch/arm/mach-meson/board-g12a.c b/arch/arm/mach-meson/board-g12a.c
new file mode 100644
index 0000000000..fc3764b960
--- /dev/null
+++ b/arch/arm/mach-meson/board-g12a.c
@@ -0,0 +1,150 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2016 Beniamino Galvani <b.galvani@gmail.com>
+ * (C) Copyright 2018 Neil Armstrong <narmstrong@baylibre.com>
+ */
+
+#include <common.h>
+#include <asm/arch/boot.h>
+#include <asm/arch/eth.h>
+#include <asm/arch/g12a.h>
+#include <asm/arch/mem.h>
+#include <asm/io.h>
+#include <asm/armv8/mmu.h>
+#include <linux/sizes.h>
+#include <phy.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+int meson_get_boot_device(void)
+{
+	return readl(G12A_AO_SEC_GP_CFG0) & G12A_AO_BOOT_DEVICE;
+}
+
+/* Configure the reserved memory zones exported by the secure registers
+ * into EFI and DTB reserved memory entries.
+ */
+void meson_init_reserved_memory(void *fdt)
+{
+	u64 bl31_size, bl31_start;
+	u64 bl32_size, bl32_start;
+	u32 reg;
+
+	/*
+	 * Get ARM Trusted Firmware reserved memory zones in :
+	 * - AO_SEC_GP_CFG3: bl32 & bl31 size in KiB, can be 0
+	 * - AO_SEC_GP_CFG5: bl31 physical start address, can be NULL
+	 * - AO_SEC_GP_CFG4: bl32 physical start address, can be NULL
+	 */
+	reg = readl(G12A_AO_SEC_GP_CFG3);
+
+	bl31_size = ((reg & G12A_AO_BL31_RSVMEM_SIZE_MASK)
+			>> G12A_AO_BL31_RSVMEM_SIZE_SHIFT) * SZ_1K;
+	bl32_size = (reg & G12A_AO_BL32_RSVMEM_SIZE_MASK) * SZ_1K;
+
+	bl31_start = readl(G12A_AO_SEC_GP_CFG5);
+	bl32_start = readl(G12A_AO_SEC_GP_CFG4);
+
+	/* Add BL31 reserved zone */
+	if (bl31_start && bl31_size)
+		meson_board_add_reserved_memory(fdt, bl31_start, bl31_size);
+
+	/* Add BL32 reserved zone */
+	if (bl32_start && bl32_size)
+		meson_board_add_reserved_memory(fdt, bl32_start, bl32_size);
+}
+
+phys_size_t get_effective_memsize(void)
+{
+	/* Size is reported in MiB, convert it in bytes */
+	return ((readl(G12A_AO_SEC_GP_CFG0) & G12A_AO_MEM_SIZE_MASK)
+			>> G12A_AO_MEM_SIZE_SHIFT) * SZ_1M;
+}
+
+static struct mm_region g12a_mem_map[] = {
+	{
+		.virt = 0x0UL,
+		.phys = 0x0UL,
+		.size = 0x80000000UL,
+		.attrs = PTE_BLOCK_MEMTYPE(MT_NORMAL) |
+			 PTE_BLOCK_INNER_SHARE
+	}, {
+		.virt = 0xf0000000UL,
+		.phys = 0xf0000000UL,
+		.size = 0x10000000UL,
+		.attrs = PTE_BLOCK_MEMTYPE(MT_DEVICE_NGNRNE) |
+			 PTE_BLOCK_NON_SHARE |
+			 PTE_BLOCK_PXN | PTE_BLOCK_UXN
+	}, {
+		/* List terminator */
+		0,
+	}
+};
+
+struct mm_region *mem_map = g12a_mem_map;
+
+static void g12a_enable_external_mdio(void)
+{
+	writel(0x0, ETH_PHY_CNTL2);
+}
+
+static void g12a_enable_internal_mdio(void)
+{
+	/* Fire up the PHY PLL */
+	writel(0x29c0040a, ETH_PLL_CNTL0);
+	writel(0x927e0000, ETH_PLL_CNTL1);
+	writel(0xac5f49e5, ETH_PLL_CNTL2);
+	writel(0x00000000, ETH_PLL_CNTL3);
+	writel(0x00000000, ETH_PLL_CNTL4);
+	writel(0x20200000, ETH_PLL_CNTL5);
+	writel(0x0000c002, ETH_PLL_CNTL6);
+	writel(0x00000023, ETH_PLL_CNTL7);
+	writel(0x39c0040a, ETH_PLL_CNTL0);
+	writel(0x19c0040a, ETH_PLL_CNTL0);
+
+	/* Select the internal MDIO */
+	writel(0x33000180, ETH_PHY_CNTL0);
+	writel(0x00074043, ETH_PHY_CNTL1);
+	writel(0x00000260, ETH_PHY_CNTL2);
+}
+
+/* Configure the Ethernet MAC with the requested interface mode
+ * with some optional flags.
+ */
+void meson_eth_init(phy_interface_t mode, unsigned int flags)
+{
+	switch (mode) {
+	case PHY_INTERFACE_MODE_RGMII:
+	case PHY_INTERFACE_MODE_RGMII_ID:
+	case PHY_INTERFACE_MODE_RGMII_RXID:
+	case PHY_INTERFACE_MODE_RGMII_TXID:
+		/* Set RGMII mode */
+		setbits_le32(G12A_ETH_REG_0, G12A_ETH_REG_0_PHY_INTF_RGMII |
+			     G12A_ETH_REG_0_TX_PHASE(1) |
+			     G12A_ETH_REG_0_TX_RATIO(4) |
+			     G12A_ETH_REG_0_PHY_CLK_EN |
+			     G12A_ETH_REG_0_CLK_EN);
+		break;
+
+	case PHY_INTERFACE_MODE_RMII:
+		/* Set RMII mode */
+		out_le32(G12A_ETH_REG_0, G12A_ETH_REG_0_PHY_INTF_RMII |
+					G12A_ETH_REG_0_INVERT_RMII_CLK |
+					G12A_ETH_REG_0_CLK_EN);
+
+		/* Use G12A RMII Internal PHY */
+		if (flags & MESON_USE_INTERNAL_RMII_PHY)
+			g12a_enable_internal_mdio();
+		else
+			g12a_enable_external_mdio();
+
+		break;
+
+	default:
+		printf("Invalid Ethernet interface mode\n");
+		return;
+	}
+
+	/* Enable power gate */
+	clrbits_le32(G12A_MEM_PD_REG_0, G12A_MEM_PD_REG_0_ETH_MASK);
+}