u-boot/board/sipeed/maix/maix.c
Sean Anderson a7c81fc853 riscv: Add Sipeed Maix support
The Sipeed Maix series is a collection of boards built around the RISC-V
Kendryte K210 processor. This processor contains several peripherals to
accelerate neural network processing and other "ai" tasks. This includes a
"KPU" neural network processor, an audio processor supporting beamforming
reception, and a digital video port supporting capture and output at VGA
resolution. Other peripherals include 8M of sram (accessible with and
without caching); remappable pins, including 40 GPIOs; AES, FFT, and SHA256
accelerators; a DMA controller; and I2C, I2S, and SPI controllers. Maix
peripherals vary, but include spi flash; on-board usb-serial bridges; ports
for cameras, displays, and sd cards; and ESP32 chips. Currently, only the
Sipeed Maix Bit V2.0 (bitm) is supported, but the boards are fairly
similar.

Documentation for Maix boards is located at
<http://dl.sipeed.com/MAIX/HDK/>.  Documentation for the Kendryte K210 is
located at <https://kendryte.com/downloads/>. However, hardware details are
rather lacking, so most technical reference has been taken from the
standalone sdk located at
<https://github.com/kendryte/kendryte-standalone-sdk>.

Signed-off-by: Sean Anderson <seanga2@gmail.com>
2020-07-01 15:01:22 +08:00

41 lines
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C

// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2019-20 Sean Anderson <seanga2@gmail.com>
*/
#include <common.h>
#include <clk.h>
#include <dm.h>
#include <fdt_support.h>
#include <asm/io.h>
phys_size_t get_effective_memsize(void)
{
return CONFIG_SYS_SDRAM_SIZE;
}
int board_init(void)
{
int ret, i;
const char * const banks[] = { "sram0", "sram1", "airam" };
ofnode memory;
struct clk clk;
/* Enable RAM clocks */
memory = ofnode_by_compatible(ofnode_null(), "kendryte,k210-sram");
if (ofnode_equal(memory, ofnode_null()))
return -ENOENT;
for (i = 0; i < ARRAY_SIZE(banks); i++) {
ret = clk_get_by_name_nodev(memory, banks[i], &clk);
if (ret)
continue;
ret = clk_enable(&clk);
clk_free(&clk);
if (ret)
return ret;
}
return 0;
}