[U-Boot] [PATCH 1/4] mips: Add basic MediaTek MT7620/88 support
Stefan Roese
sr at denx.de
Mon Aug 6 15:11:06 UTC 2018
This patch adds basic support for the MediaTek MT7620/88 SoCs. Parts of
the code is copied from the MediaTek GitHub repository:
https://github.com/MediaTek-Labs/linkit-smart-uboot.git
Support for the LinkIt Smart 7688 module and the Gardena Smart Gateway
both based on the MT7688 will be added in further patches.
Signed-off-by: Stefan Roese <sr at denx.de>
Cc: Daniel Schwierzeck <daniel.schwierzeck at gmail.com>
---
arch/mips/Kconfig | 15 ++
arch/mips/Makefile | 1 +
arch/mips/mach-mt7620/Kconfig | 130 ++++++++++
arch/mips/mach-mt7620/Makefile | 8 +
arch/mips/mach-mt7620/cpu.c | 66 +++++
arch/mips/mach-mt7620/ddr_calibrate.c | 331 +++++++++++++++++++++++++
arch/mips/mach-mt7620/lowlevel_init.S | 337 ++++++++++++++++++++++++++
arch/mips/mach-mt7620/mt76xx.h | 39 +++
8 files changed, 927 insertions(+)
create mode 100644 arch/mips/mach-mt7620/Kconfig
create mode 100644 arch/mips/mach-mt7620/Makefile
create mode 100644 arch/mips/mach-mt7620/cpu.c
create mode 100644 arch/mips/mach-mt7620/ddr_calibrate.c
create mode 100644 arch/mips/mach-mt7620/lowlevel_init.S
create mode 100644 arch/mips/mach-mt7620/mt76xx.h
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 31b622ff51..af791c320d 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -87,6 +87,20 @@ config ARCH_BMIPS
select SYSRESET
imply CMD_DM
+config ARCH_MT7620
+ bool "Support MT7620/7688 SoCs"
+ select SUPPORTS_LITTLE_ENDIAN
+ select SUPPORTS_CPU_MIPS32_R1
+ select SUPPORTS_CPU_MIPS32_R2
+ select ROM_EXCEPTION_VECTORS
+ select MIPS_TUNE_4KC
+ select OF_CONTROL
+ select DM
+ select DM_SERIAL
+ select DM_SPI
+ select DM_SPI_FLASH
+ select DISPLAY_CPUINFO
+
config MACH_PIC32
bool "Support Microchip PIC32"
select DM
@@ -141,6 +155,7 @@ source "board/qemu-mips/Kconfig"
source "arch/mips/mach-ath79/Kconfig"
source "arch/mips/mach-bmips/Kconfig"
source "arch/mips/mach-pic32/Kconfig"
+source "arch/mips/mach-mt7620/Kconfig"
if MIPS
diff --git a/arch/mips/Makefile b/arch/mips/Makefile
index 5deec9a202..cc8ea5d7d4 100644
--- a/arch/mips/Makefile
+++ b/arch/mips/Makefile
@@ -15,6 +15,7 @@ machine-$(CONFIG_SOC_AU1X00) += au1x00
machine-$(CONFIG_ARCH_ATH79) += ath79
machine-$(CONFIG_ARCH_BMIPS) += bmips
machine-$(CONFIG_MACH_PIC32) += pic32
+machine-$(CONFIG_ARCH_MT7620) += mt7620
machdirs := $(patsubst %,arch/mips/mach-%/,$(machine-y))
libs-y += $(machdirs)
diff --git a/arch/mips/mach-mt7620/Kconfig b/arch/mips/mach-mt7620/Kconfig
new file mode 100644
index 0000000000..40e15b8a31
--- /dev/null
+++ b/arch/mips/mach-mt7620/Kconfig
@@ -0,0 +1,130 @@
+menu "MediaTek MIPS platforms"
+ depends on ARCH_MT7620
+
+config SYS_MALLOC_F_LEN
+ default 0x1000
+
+config SYS_SOC
+ default "mt7620" if SOC_MT7620
+
+choice
+ prompt "MediaTek MIPS SoC select"
+
+config SOC_MT7620
+ bool "MT7620/8"
+ select MIPS_L1_CACHE_SHIFT_5
+ help
+ This supports MediaTek MIPS MT7620 family.
+
+endchoice
+
+choice
+ prompt "Board select"
+
+config BOARD_LINKIT_SMART_7688
+ bool "LinkIt Smart 7688"
+ depends on SOC_MT7620
+ select SUPPORTS_BOOT_RAM
+ help
+ Seeed LinkIt Smart 7688 boards have a MT7688 SoC with 128 MiB of RAM
+ and 32 MiB of flash (SPI).
+ Between its different peripherals there's an integrated switch with 4
+ ethernet ports, 1 USB port, 1 UART, GPIO buttons and LEDs, and
+ a MT7688 (PCIe).
+
+endchoice
+
+choice
+ prompt "Boot mode"
+
+config BOOT_RAM
+ bool "RAM boot"
+ depends on SUPPORTS_BOOT_RAM
+ select SKIP_LOWLEVEL_INIT
+ help
+ This builds an image that is linked to a RAM address. It can be used
+ for booting from CFE via TFTP using an ELF image, but it can also be
+ booted from RAM by other bootloaders using a BIN image.
+
+config BOOT_ROM
+ bool "ROM boot"
+ depends on SUPPORTS_BOOT_RAM
+ help
+ This builds an image that is linked to a ROM address. It can be
+ used as main bootloader image which is programmed onto the onboard
+ flash storage (SPI NOR).
+
+endchoice
+
+choice
+ prompt "DDR2 size"
+
+config ONBOARD_DDR2_SIZE_256MBIT
+ bool "256MBit (32MByte) total size"
+ depends on BOOT_ROM
+ help
+ Use 256MBit (32MByte) of DDR total size
+
+config ONBOARD_DDR2_SIZE_512MBIT
+ bool "512MBit (64MByte) total size"
+ depends on BOOT_ROM
+ help
+ Use 512MBit (64MByte) of DDR total size
+
+config ONBOARD_DDR2_SIZE_1024MBIT
+ bool "1024MBit (128MByte) total size"
+ depends on BOOT_ROM
+ help
+ Use 1024MBit (128MByte) of DDR total size
+
+config ONBOARD_DDR2_SIZE_2048MBIT
+ bool "2048MBit (256MByte) total size"
+ depends on BOOT_ROM
+ help
+ Use 2048MBit (256MByte) of DDR total size
+
+endchoice
+
+choice
+ prompt "DDR2 chip width"
+
+config ONBOARD_DDR2_CHIP_WIDTH_8BIT
+ bool "8bit DDR chip width"
+ depends on BOOT_ROM
+ help
+ Use DDR chips with 8bit width
+
+config ONBOARD_DDR2_CHIP_WIDTH_16BIT
+ bool "16bit DDR chip width"
+ depends on BOOT_ROM
+ help
+ Use DDR chips with 16bit width
+
+endchoice
+
+choice
+ prompt "DDR2 bus width"
+
+config ONBOARD_DDR2_BUS_WIDTH_16BIT
+ bool "16bit DDR bus width"
+ depends on BOOT_ROM
+ help
+ Use 16bit DDR bus width
+
+config ONBOARD_DDR2_BUS_WIDTH_32BIT
+ bool "32bit DDR bus width"
+ depends on BOOT_ROM
+ help
+ Use 32bit DDR bus width
+
+endchoice
+
+config SUPPORTS_BOOT_RAM
+ bool
+
+config SKIP_LOWLEVEL_INIT
+ bool
+
+source "board/seeed/linkit-smart-7688/Kconfig"
+
+endmenu
diff --git a/arch/mips/mach-mt7620/Makefile b/arch/mips/mach-mt7620/Makefile
new file mode 100644
index 0000000000..1f3e65e8a5
--- /dev/null
+++ b/arch/mips/mach-mt7620/Makefile
@@ -0,0 +1,8 @@
+# SPDX-License-Identifier: GPL-2.0+
+
+obj-y += cpu.o
+
+ifndef CONFIG_SKIP_LOWLEVEL_INIT
+obj-y += ddr_calibrate.o
+obj-y += lowlevel_init.o
+endif
diff --git a/arch/mips/mach-mt7620/cpu.c b/arch/mips/mach-mt7620/cpu.c
new file mode 100644
index 0000000000..0b22956499
--- /dev/null
+++ b/arch/mips/mach-mt7620/cpu.c
@@ -0,0 +1,66 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2018 Stefan Roese <sr at denx.de>
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <ram.h>
+#include <asm/io.h>
+#include <linux/io.h>
+#include <linux/sizes.h>
+#include "mt76xx.h"
+
+#define STR_LEN 6
+
+#ifdef CONFIG_BOOT_ROM
+int mach_cpu_init(void)
+{
+ void (*ptr)(void);
+
+ /*
+ * DDR calibration routine needs to be called very early. This
+ * function also configures the clock to run at full speed.
+ */
+ ptr = (void *)CKSEG0ADDR(ddr_calibrate);
+ (*ptr)();
+
+ return 0;
+}
+#endif
+
+int print_cpuinfo(void)
+{
+ static const char * const boot_str[] = { "PLL (3-Byte SPI Addr)",
+ "PLL (4-Byte SPI Addr)",
+ "XTAL (3-Byte SPI Addr)",
+ "XTAL (4-Byte SPI Addr)" };
+ char *chr = (char *)MT76XX_CHIPID;
+ char buf[STR_LEN + 1];
+ u32 val;
+
+ snprintf(buf, STR_LEN + 1, "%s", chr);
+ val = readl((void *)MT76XX_CHIP_REV_ID);
+ printf("CPU: %-*s Rev %ld.%ld - ", STR_LEN, buf,
+ (val & GENMASK(11, 8)) >> 8, val & GENMASK(3, 0));
+
+ val = (readl((void *)MT76XX_SYSCFG0) & GENMASK(3, 1)) >> 1;
+ printf("Boot from %s\n", boot_str[val]);
+
+ return 0;
+}
+
+void _machine_restart(void)
+{
+ writel(0x01, (void *)MT76XX_RSTCTL);
+
+ while (1)
+ ; /* NOP */
+}
+
+int dram_init(void)
+{
+ gd->ram_size = get_ram_size((void *)CONFIG_SYS_SDRAM_BASE, SZ_256M);
+
+ return 0;
+}
diff --git a/arch/mips/mach-mt7620/ddr_calibrate.c b/arch/mips/mach-mt7620/ddr_calibrate.c
new file mode 100644
index 0000000000..6fd136674e
--- /dev/null
+++ b/arch/mips/mach-mt7620/ddr_calibrate.c
@@ -0,0 +1,331 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2018 Stefan Roese <sr at denx.de>
+ *
+ * This code is mostly based on the code extracted from this MediaTek
+ * github repository:
+ *
+ * https://github.com/MediaTek-Labs/linkit-smart-uboot.git
+ *
+ * I was not able to find a specific license or other developers
+ * copyrights here, so I can't add them here.
+ *
+ * Most functions in this file are copied from the MediaTek U-Boot
+ * repository. Without any documentation, it was impossible to really
+ * implement this differently. So its mostly a cleaned-up version of
+ * the original code, with only support for the MT7628 / MT7688 SoC.
+ */
+
+#include <common.h>
+#include <linux/io.h>
+#include <asm/cacheops.h>
+#include <asm/io.h>
+#include "mt76xx.h"
+
+#define NUM_OF_CACHELINE 64
+#define MIN_START 6
+#define MIN_FINE_START 0xf
+#define MAX_START 7
+#define MAX_FINE_START 0x0
+
+#define CPU_FRAC_DIV 1
+
+#if defined(CONFIG_ONBOARD_DDR2_SIZE_256MBIT)
+#define DRAM_BUTTOM 0x02000000
+#endif
+#if defined(CONFIG_ONBOARD_DDR2_SIZE_512MBIT)
+#define DRAM_BUTTOM 0x04000000
+#endif
+#if defined(CONFIG_ONBOARD_DDR2_SIZE_1024MBIT)
+#define DRAM_BUTTOM 0x08000000
+#endif
+#if defined(CONFIG_ONBOARD_DDR2_SIZE_2048MBIT)
+#define DRAM_BUTTOM 0x10000000
+#endif
+
+static inline void cal_memcpy(void *src, void *dst, u32 size)
+{
+ u8 *psrc = (u8 *)src;
+ u8 *pdst = (u8 *)dst;
+ int i;
+
+ for (i = 0; i < size; i++, psrc++, pdst++)
+ *pdst = *psrc;
+}
+
+static inline void cal_memset(void *src, u8 pat, u32 size)
+{
+ u8 *psrc = (u8 *)src;
+ int i;
+
+ for (i = 0; i < size; i++, psrc++)
+ *psrc = pat;
+}
+
+#define pref_op(hint, addr) \
+ __asm__ __volatile__( \
+ ".set push\n" \
+ ".set noreorder\n" \
+ "pref %0, %1\n" \
+ ".set pop\n" \
+ : \
+ : "i" (hint), "R" (*(u8 *)(addr)))
+
+#define cache_op(op, addr) \
+ __asm__ __volatile__( \
+ ".set push\n" \
+ ".set noreorder\n" \
+ ".set mips3\n" \
+ "cache %0, %1\n" \
+ ".set pop\n" \
+ : \
+ : "i" (op), "R" (*(u8 *)(addr)))
+
+static inline void cal_invalidate_dcache_range(u32 start_addr, u32 stop)
+{
+ u32 lsize = CONFIG_SYS_CACHELINE_SIZE;
+ u32 addr = start_addr & ~(lsize - 1);
+ u32 aend = (stop - 1) & ~(lsize - 1);
+
+ while (1) {
+ cache_op(HIT_INVALIDATE_D, addr);
+ if (addr == aend)
+ break;
+ addr += lsize;
+ }
+}
+
+static inline void cal_patgen(u32 start_addr, u32 size, u32 bias)
+{
+ u32 *addr = (u32 *)start_addr;
+ int i;
+
+ for (i = 0; i < size; i++)
+ addr[i] = start_addr + i + bias;
+}
+
+static inline int test_loop(int k, int dqs, u32 test_dqs, u32 *coarse_dqs,
+ u32 offs, u32 pat, u32 val)
+{
+ u32 nc_addr;
+ u32 *c_addr;
+ int i;
+
+ for (nc_addr = 0xa0000000;
+ nc_addr < (0xa0000000 + DRAM_BUTTOM - NUM_OF_CACHELINE * 32);
+ nc_addr += (DRAM_BUTTOM >> 6) + offs) {
+ writel(0x00007474, MT76XX_MEMCTRL_BASE + 0x64);
+ wmb(); /* Make sure store if finished */
+
+ c_addr = (u32 *)(nc_addr & 0xdfffffff);
+ cal_memset(((u8 *)c_addr), 0x1F, NUM_OF_CACHELINE * 32);
+ cal_patgen(nc_addr, NUM_OF_CACHELINE * 8, pat);
+
+ if (dqs > 0)
+ writel(0x00000074 |
+ (((k == 1) ? coarse_dqs[dqs] : test_dqs) << 12) |
+ (((k == 0) ? val : test_dqs) << 8),
+ MT76XX_MEMCTRL_BASE + 0x64);
+ else
+ writel(0x00007400 |
+ (((k == 1) ? coarse_dqs[dqs] : test_dqs) << 4) |
+ (((k == 0) ? val : test_dqs) << 0),
+ MT76XX_MEMCTRL_BASE + 0x64);
+ wmb(); /* Make sure store if finished */
+
+ cal_invalidate_dcache_range((u32)c_addr,
+ (u32)c_addr +
+ NUM_OF_CACHELINE * 32);
+ wmb(); /* Make sure store if finished */
+
+ for (i = 0; i < NUM_OF_CACHELINE * 8; i++) {
+ if (i % 8 == 0)
+ pref_op(0, &c_addr[i]);
+ }
+
+ for (i = 0; i < NUM_OF_CACHELINE * 8; i++) {
+ if (c_addr[i] != nc_addr + i + pat)
+ return -1;
+ }
+ }
+
+ return 0;
+}
+
+void ddr_calibrate(void)
+{
+ u32 min_coarse_dqs[2];
+ u32 max_coarse_dqs[2];
+ u32 min_fine_dqs[2];
+ u32 max_fine_dqs[2];
+ u32 coarse_dqs[2];
+ u32 fine_dqs[2];
+ int reg = 0, ddr_cfg2_reg;
+ int flag;
+ int i, k;
+ int dqs = 0;
+ u32 min_coarse_dqs_bnd, min_fine_dqs_bnd, coarse_dqs_dll, fine_dqs_dll;
+ u32 val;
+ u32 fdiv = 0, frac = 0;
+
+ /* Setup clock to run at full speed */
+ val = readl(MT76XX_DYN_CFG0_REG);
+ fdiv = (u32)((val >> 8) & 0x0F);
+ if (CPU_FRAC_DIV < 1 || CPU_FRAC_DIV > 10)
+ frac = val & 0x0f;
+ else
+ frac = CPU_FRAC_DIV;
+
+ while (frac < fdiv) {
+ val = readl(MT76XX_DYN_CFG0_REG);
+ fdiv = (val >> 8) & 0x0f;
+ fdiv--;
+ val &= ~(0x0f << 8);
+ val |= (fdiv << 8);
+ writel(val, MT76XX_DYN_CFG0_REG);
+ udelay(500);
+ val = readl(MT76XX_DYN_CFG0_REG);
+ fdiv = (val >> 8) & 0x0f;
+ }
+
+ clrbits_le32(MT76XX_MEMCTRL_BASE + 0x10, BIT(4));
+ ddr_cfg2_reg = readl(MT76XX_MEMCTRL_BASE + 0x48);
+ clrbits_le32(MT76XX_MEMCTRL_BASE + 0x48, (0x3 << 28) | (0x3 << 26));
+
+ min_coarse_dqs[0] = MIN_START;
+ min_coarse_dqs[1] = MIN_START;
+ min_fine_dqs[0] = MIN_FINE_START;
+ min_fine_dqs[1] = MIN_FINE_START;
+ max_coarse_dqs[0] = MAX_START;
+ max_coarse_dqs[1] = MAX_START;
+ max_fine_dqs[0] = MAX_FINE_START;
+ max_fine_dqs[1] = MAX_FINE_START;
+ dqs = 0;
+
+ /* Add by KP, DQS MIN boundary */
+ reg = readl(MT76XX_MEMCTRL_BASE + 0x20);
+ coarse_dqs_dll = (reg & 0xf00) >> 8;
+ fine_dqs_dll = (reg & 0xf0) >> 4;
+ if (coarse_dqs_dll <= 8)
+ min_coarse_dqs_bnd = 8 - coarse_dqs_dll;
+ else
+ min_coarse_dqs_bnd = 0;
+
+ if (fine_dqs_dll <= 8)
+ min_fine_dqs_bnd = 8 - fine_dqs_dll;
+ else
+ min_fine_dqs_bnd = 0;
+ /* DQS MIN boundary */
+
+DQS_CAL:
+
+ for (k = 0; k < 2; k++) {
+ u32 test_dqs;
+
+ if (k == 0)
+ test_dqs = MAX_START;
+ else
+ test_dqs = MAX_FINE_START;
+
+ do {
+ flag = test_loop(k, dqs, test_dqs, max_coarse_dqs,
+ 0x400, 0x3, 0xf);
+ if (flag == -1)
+ break;
+
+ test_dqs++;
+ } while (test_dqs <= 0xf);
+
+ if (k == 0) {
+ max_coarse_dqs[dqs] = test_dqs;
+ } else {
+ test_dqs--;
+
+ if (test_dqs == MAX_FINE_START - 1) {
+ max_coarse_dqs[dqs]--;
+ max_fine_dqs[dqs] = 0xf;
+ } else {
+ max_fine_dqs[dqs] = test_dqs;
+ }
+ }
+ }
+
+ for (k = 0; k < 2; k++) {
+ u32 test_dqs;
+
+ if (k == 0)
+ test_dqs = MIN_START;
+ else
+ test_dqs = MIN_FINE_START;
+
+ do {
+ flag = test_loop(k, dqs, test_dqs, min_coarse_dqs,
+ 0x480, 0x1, 0x0);
+ if (k == 0) {
+ if (flag == -1 ||
+ test_dqs == min_coarse_dqs_bnd)
+ break;
+
+ test_dqs--;
+
+ if (test_dqs < min_coarse_dqs_bnd)
+ break;
+ } else {
+ if (flag == -1) {
+ test_dqs++;
+ break;
+ } else if (test_dqs == min_fine_dqs_bnd) {
+ break;
+ }
+
+ test_dqs--;
+
+ if (test_dqs < min_fine_dqs_bnd)
+ break;
+ }
+ } while (test_dqs >= 0);
+
+ if (k == 0) {
+ min_coarse_dqs[dqs] = test_dqs;
+ } else {
+ if (test_dqs == MIN_FINE_START + 1) {
+ min_coarse_dqs[dqs]++;
+ min_fine_dqs[dqs] = 0x0;
+ } else {
+ min_fine_dqs[dqs] = test_dqs;
+ }
+ }
+ }
+
+ if (dqs == 0) {
+ dqs = 1;
+ goto DQS_CAL;
+ }
+
+ for (i = 0; i < 2; i++) {
+ u32 temp;
+
+ coarse_dqs[i] = (max_coarse_dqs[i] + min_coarse_dqs[i]) >> 1;
+ temp =
+ (((max_coarse_dqs[i] + min_coarse_dqs[i]) % 2) * 4) +
+ ((max_fine_dqs[i] + min_fine_dqs[i]) >> 1);
+ if (temp >= 0x10) {
+ coarse_dqs[i]++;
+ fine_dqs[i] = (temp - 0x10) + 0x8;
+ } else {
+ fine_dqs[i] = temp;
+ }
+ }
+ reg = (coarse_dqs[1] << 12) | (fine_dqs[1] << 8) |
+ (coarse_dqs[0] << 4) | fine_dqs[0];
+
+ clrbits_le32(MT76XX_MEMCTRL_BASE + 0x10, BIT(4));
+ writel(reg, MT76XX_MEMCTRL_BASE + 0x64);
+ writel(ddr_cfg2_reg, MT76XX_MEMCTRL_BASE + 0x48);
+ setbits_le32(MT76XX_MEMCTRL_BASE + 0x10, BIT(4));
+
+ for (i = 0; i < 2; i++)
+ debug("[%02X%02X%02X%02X]", min_coarse_dqs[i],
+ min_fine_dqs[i], max_coarse_dqs[i], max_fine_dqs[i]);
+ debug("\nDDR Calibration DQS reg = %08X\n", reg);
+}
diff --git a/arch/mips/mach-mt7620/lowlevel_init.S b/arch/mips/mach-mt7620/lowlevel_init.S
new file mode 100644
index 0000000000..92b2fcd2bb
--- /dev/null
+++ b/arch/mips/mach-mt7620/lowlevel_init.S
@@ -0,0 +1,337 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * (c) 2018 Stefan Roese <sr at denx.de>
+ *
+ * This code is mostly based on the code extracted from this MediaTek
+ * github repository:
+ *
+ * https://github.com/MediaTek-Labs/linkit-smart-uboot.git
+ *
+ * I was not able to find a specific license or other developers
+ * copyrights here, so I can't add them here.
+ */
+
+#include <config.h>
+#include <asm/regdef.h>
+#include <asm/mipsregs.h>
+#include <asm/asm.h>
+#include "mt76xx.h"
+
+#ifndef BIT
+#define BIT(nr) (1 << (nr))
+#endif
+
+#define DELAY_USEC(us) ((us) / 100)
+
+#define DDR_CFG1_CHIP_WIDTH_MASK (0x3 << 16)
+#define DDR_CFG1_BUS_WIDTH_MASK (0x3 << 12)
+
+#if defined(CONFIG_ONBOARD_DDR2_SIZE_256MBIT)
+#define DDR_CFG1_SIZE_VAL 0x222e2323
+#define DDR_CFG4_SIZE_VAL 7
+#endif
+#if defined(CONFIG_ONBOARD_DDR2_SIZE_512MBIT)
+#define DDR_CFG1_SIZE_VAL 0x22322323
+#define DDR_CFG4_SIZE_VAL 9
+#endif
+#if defined(CONFIG_ONBOARD_DDR2_SIZE_1024MBIT)
+#define DDR_CFG1_SIZE_VAL 0x22362323
+#define DDR_CFG4_SIZE_VAL 9
+#endif
+#if defined(CONFIG_ONBOARD_DDR2_SIZE_2048MBIT)
+#define DDR_CFG1_SIZE_VAL 0x223a2323
+#define DDR_CFG4_SIZE_VAL 9
+#endif
+
+#if defined(CONFIG_ONBOARD_DDR2_CHIP_WIDTH_8BIT)
+#define DDR_CFG1_CHIP_WIDTH_VAL (0x1 << 16)
+#endif
+#if defined(CONFIG_ONBOARD_DDR2_CHIP_WIDTH_16BIT)
+#define DDR_CFG1_CHIP_WIDTH_VAL (0x2 << 16)
+#endif
+
+#if defined(CONFIG_ONBOARD_DDR2_BUS_WIDTH_16BIT)
+#define DDR_CFG1_BUS_WIDTH_VAL (0x2 << 12)
+#endif
+#if defined(CONFIG_ONBOARD_DDR2_BUS_WIDTH_32BIT)
+#define DDR_CFG1_BUS_WIDTH_VAL (0x3 << 12)
+#endif
+
+LEAF(lowlevel_init)
+ /* polling CPLL is ready */
+ li t1, DELAY_USEC(1000000)
+ la t5, MT76XX_ROM_STATUS_REG
+1:
+ lw t2, 0(t5)
+ andi t2, t2, 0x1
+ bnez t2, CPLL_READY
+ subu t1, t1, 1
+ bgtz t1, 1b
+ nop
+ la t0, MT76XX_CLKCFG0_REG
+ lw t3, 0(t0)
+ ori t3, t3, 0x1
+ sw t3, 0(t0)
+ j CPLL_DONE
+ nop
+CPLL_READY:
+ la t0, MT76XX_CLKCFG0_REG
+ lw t1, 0(t0)
+ li t2, ~0x0c
+ and t1, t1, t2
+ ori t1, t1, 0xc
+ sw t1, 0(t0)
+ la t0, MT76XX_DYN_CFG0_REG
+ lw t3, 0(t0)
+ li t5, ~((0x0f << 8) | (0x0f << 0))
+ and t3, t3, t5
+ li t5, (10 << 8) | (1 << 0)
+ or t3, t3, t5
+ sw t3, 0(t0)
+ la t0, MT76XX_CLKCFG0_REG
+ lw t3, 0(t0)
+ li t4, ~0x0F
+ and t3, t3, t4
+ ori t3, t3, 0xc
+ sw t3, 0(t0)
+ lw t3, 0(t0)
+ ori t3, t3, 0x08
+ sw t3, 0(t0)
+
+CPLL_DONE:
+ /*
+ * SDR and DDR initialization: delay 200us
+ */
+ li t0, DELAY_USEC(200 + 40)
+ li t1, 0x1
+1:
+ sub t0, t0, t1
+ bnez t0, 1b
+ nop
+
+ /* set DRAM IO PAD for MT7628IC */
+ /* DDR LDO Enable */
+ li t1, MT76XX_RGCTRL_BASE+0x100
+ lw t4, 0(t1)
+ li t2, BIT(31)
+ or t4, t4, t2
+ sw t4, 0(t1)
+ li t1, MT76XX_RGCTRL_BASE+0x10c
+ lw t4, 0(t1)
+ j LDO_1P8V
+ nop
+LDO_1P8V:
+ li t2, ~BIT(6)
+ and t4, t4, t2
+ li t1, MT76XX_RGCTRL_BASE+0x10c
+ sw t4, 0(t1)
+ j DDRLDO_SOFT_START
+LDO_2P5V:
+ /* suppose external DDR1 LDO 2.5V */
+ li t2, BIT(6)
+ or t4, t4, t2
+ li t1, MT76XX_RGCTRL_BASE+0x10c
+ sw t4, 0(t1)
+
+DDRLDO_SOFT_START:
+ li t1, MT76XX_RGCTRL_BASE+0x10c
+ lw t2, 0(t1)
+ li t3, BIT(16)
+ or t2, t2, t3
+ sw t2, 0(t1)
+ li t3, DELAY_USEC(250*50)
+LDO_DELAY:
+ subu t3, t3, 1
+ bnez t3, LDO_DELAY
+ nop
+
+ li t1, MT76XX_RGCTRL_BASE+0x10c
+ lw t2, 0(t1)
+ li t3, BIT(18)
+ or t2, t2, t3
+ sw t2, 0(t1)
+
+SET_RG_BUCK_FPWM:
+ li t1, MT76XX_RGCTRL_BASE+0x104
+ lw t2, 0(t1)
+ ori t2, t2, BIT(10)
+ sw t2, 0(t1)
+
+DDR_PAD_CFG:
+ /* clean CLK PAD */
+ li t1, MT76XX_RGCTRL_BASE+0x704
+ lw t2, 0(t1)
+ li t8, 0xfffff0f0
+ and t2, t2, t8
+ /* clean CMD PAD */
+ li t1, MT76XX_RGCTRL_BASE+0x70c
+ lw t3, 0(t1)
+ li t8, 0xfffff0f0
+ and t3, t3, t8
+ /* clean DQ IPAD */
+ li t1, MT76XX_RGCTRL_BASE+0x710
+ lw t4, 0(t1)
+ li t8, 0xfffff8ff
+ and t4, t4, t8
+ /* clean DQ OPAD */
+ li t1, MT76XX_RGCTRL_BASE+0x714
+ lw t5, 0(t1)
+ li t8, 0xfffff0f0
+ and t5, t5, t8
+ /* clean DQS IPAD */
+ li t1, MT76XX_RGCTRL_BASE+0x718
+ lw t6, 0(t1)
+ li t8, 0xfffff8ff
+ and t6, t6, t8
+ /* clean DQS OPAD */
+ li t1, MT76XX_RGCTRL_BASE+0x71c
+ lw t7, 0(t1)
+ li t8, 0xfffff0f0
+ and t7, t7, t8
+
+ li t1, MT76XX_SYSCTL_BASE+0xC
+ lw t9, 0(t1)
+ srl t9, t9, 16
+ andi t9, t9, 0x1
+ bnez t9, MT7628_AN_DDR1_PAD
+MT7628_KN_PAD:
+ li t8, 0x00000303
+ or t2, t2, t8
+ or t3, t3, t8
+ or t5, t5, t8
+ or t7, t7, t8
+ li t8, 0x00000000
+ or t4, t4, t8
+ or t6, t6, t8
+ j SET_PAD_CFG
+MT7628_AN_DDR1_PAD:
+ li t1, MT76XX_SYSCTL_BASE+0x10
+ lw t1, 0(t1)
+ andi t1, t1, 0x1
+ beqz t1, MT7628_AN_DDR2_PAD
+ li t8, 0x00000c0c
+ or t2, t2, t8
+ li t8, 0x00000202
+ or t3, t3, t8
+ li t8, 0x00000707
+ or t5, t5, t8
+ li t8, 0x00000c0c
+ or t7, t7, t8
+ li t8, 0x00000000
+ or t4, t4, t8
+ or t6, t6, t8
+ j SET_PAD_CFG
+MT7628_AN_DDR2_PAD:
+ li t8, 0x00000c0c
+ or t2, t2, t8
+ li t8, 0x00000202
+ or t3, t3, t8
+ li t8, 0x00000404
+ or t5, t5, t8
+ li t8, 0x00000c0c
+ or t7, t7, t8
+ li t8, 0x00000000 /* ODT off */
+ or t4, t4, t8
+ or t6, t6, t8
+
+SET_PAD_CFG:
+ li t1, MT76XX_RGCTRL_BASE+0x704
+ sw t2, 0(t1)
+ li t1, MT76XX_RGCTRL_BASE+0x70c
+ sw t3, 0(t1)
+ li t1, MT76XX_RGCTRL_BASE+0x710
+ sw t4, 0(t1)
+ li t1, MT76XX_RGCTRL_BASE+0x714
+ sw t5, 0(t1)
+ li t1, MT76XX_RGCTRL_BASE+0x718
+ sw t6, 0(t1)
+ li t1, MT76XX_RGCTRL_BASE+0x71c
+ sw t7, 0(t1)
+
+ /*
+ * DDR initialization: reset pin to 0
+ */
+ li t1, MT76XX_SYSCTL_BASE + 0x34
+ lw t2, 0(t1)
+ and t2, ~BIT(10)
+ sw t2, 0(t1)
+ nop
+
+ /*
+ * DDR initialization: wait til reg DDR_CFG1 bit 21 equal to 1 (ready)
+ */
+DDR_READY:
+ li t1, DDR_CFG1_REG
+ lw t0, 0(t1)
+ nop
+ and t2, t0, BIT(21)
+ beqz t2, DDR_READY
+ nop
+
+ /*
+ * DDR initialization
+ *
+ * Only DDR2 supported right now. DDR2 support can be added, once
+ * boards using it will get added to mainline U-Boot.
+ */
+ li t1, DDR_CFG2_REG
+ lw t0, 0(t1)
+ nop
+ and t0, ~BIT(30)
+ and t0, ~(7 << 4)
+ or t0, (4 << 4)
+ or t0, BIT(30)
+ or t0, BIT(11)
+ sw t0, 0(t1)
+ nop
+
+ li t1, DDR_CFG3_REG
+ lw t2, 0(t1)
+ /* Disable ODT; reference board ok, ev board fail */
+ and t2, ~BIT(6)
+ or t2, BIT(2)
+ li t0, DDR_CFG4_REG
+ lw t1, 0(t0)
+ li t2, ~(0x01f | 0x0f0)
+ and t1, t1, t2
+ ori t1, t1, DDR_CFG4_SIZE_VAL
+ sw t1, 0(t0)
+ nop
+
+ /*
+ * DDR initialization: config size and width on reg DDR_CFG1
+ */
+ li t6, DDR_CFG1_SIZE_VAL
+
+ and t6, ~DDR_CFG1_CHIP_WIDTH_MASK
+ or t6, DDR_CFG1_CHIP_WIDTH_VAL
+
+ /* CONFIG DDR_CFG1[13:12] about TOTAL WIDTH */
+ and t6, ~DDR_CFG1_BUS_WIDTH_MASK
+ or t6, DDR_CFG1_BUS_WIDTH_VAL
+
+ li t5, DDR_CFG1_REG
+ sw t6, 0(t5)
+ nop
+
+ /*
+ * DDR: enable self auto refresh for power saving
+ * enable it by default for both RAM and ROM version (for CoC)
+ */
+ li t0, MT76XX_MEMCTRL_BASE + 0x14
+ lw t1, 0(t0)
+ nop
+ and t1, 0xff000000
+ or t1, 0x01
+ sw t1, 0(t0)
+ nop
+ li t0, MT76XX_MEMCTRL_BASE + 0x10
+ lw t1, 0(t0)
+ nop
+ or t1, 0x10
+ sw t1, 0(t0)
+ nop
+
+ jr ra
+ nop
+ END(lowlevel_init)
diff --git a/arch/mips/mach-mt7620/mt76xx.h b/arch/mips/mach-mt7620/mt76xx.h
new file mode 100644
index 0000000000..712d8aade0
--- /dev/null
+++ b/arch/mips/mach-mt7620/mt76xx.h
@@ -0,0 +1,39 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright (C) 2018 Stefan Roese <sr at denx.de>
+ */
+
+#ifndef __MT76XX_H
+#define __MT76XX_H
+
+#ifdef __ASSEMBLY__
+#define VOID_PTR
+#else
+#define VOID_PTR (void *)
+#endif
+
+#define MT76XX_SYSCTL_BASE 0xb0000000
+
+#define MT76XX_CHIPID (VOID_PTR(MT76XX_SYSCTL_BASE + 0x00))
+#define MT76XX_CHIP_REV_ID (VOID_PTR(MT76XX_SYSCTL_BASE + 0x0c))
+#define MT76XX_SYSCFG0 (VOID_PTR(MT76XX_SYSCTL_BASE + 0x10))
+#define MT76XX_RSTCTL (VOID_PTR(MT76XX_SYSCTL_BASE + 0x34))
+
+#define MT76XX_MEMCTRL_BASE (VOID_PTR(MT76XX_SYSCTL_BASE + 0x0300))
+#define MT76XX_RGCTRL_BASE (VOID_PTR(MT76XX_SYSCTL_BASE + 0x1000))
+
+#define MT76XX_ROM_STATUS_REG (VOID_PTR(MT76XX_SYSCTL_BASE + 0x0028))
+#define MT76XX_CLKCFG0_REG (VOID_PTR(MT76XX_SYSCTL_BASE + 0x002c))
+#define MT76XX_DYN_CFG0_REG (VOID_PTR(MT76XX_SYSCTL_BASE + 0x0440))
+
+#define DDR_CFG1_REG (MT76XX_MEMCTRL_BASE + 0x44)
+#define DDR_CFG2_REG (MT76XX_MEMCTRL_BASE + 0x48)
+#define DDR_CFG3_REG (MT76XX_MEMCTRL_BASE + 0x4c)
+#define DDR_CFG4_REG (MT76XX_MEMCTRL_BASE + 0x50)
+
+#ifndef __ASSEMBLY__
+/* Prototypes */
+void ddr_calibrate(void);
+#endif
+
+#endif
--
2.18.0
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