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storage: Add Ramdisk driver

This commit is contained in:
CTCaer 2020-04-30 14:58:53 +03:00
parent f09263d3be
commit c8d6da5a23
3 changed files with 98 additions and 1 deletions

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@ -32,7 +32,7 @@ OBJS = $(addprefix $(BUILDDIR)/$(TARGET)/, \
OBJS += $(addprefix $(BUILDDIR)/$(TARGET)/, \
bpmp.o clock.o cluster.o di.o gpio.o i2c.o irq.o pinmux.o se.o smmu.o tsec.o uart.o \
fuse.o kfuse.o \
mc.o sdram.o minerva.o \
mc.o sdram.o minerva.o ramdisk.o \
sdmmc.o sdmmc_driver.o nx_emmc.o nx_sd.o \
bq24193.o max17050.o max7762x.o max77620-rtc.o regulator_5v.o \
touch.o joycon.o tmp451.o fan.o \

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@ -0,0 +1,67 @@
/*
* Ramdisk driver for Tegra X1
*
* Copyright (c) 2019 CTCaer
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <string.h>
#include "ramdisk.h"
#include "../mem/heap.h"
#include "../utils/types.h"
#include "../../../common/memory_map.h"
int ram_disk_init(FATFS *ram_fs)
{
int res;
u8 *buf = malloc(0x400000);
f_mount(NULL, "ram:", 1); // Unmount ramdisk.
res = f_mkfs("ram:", FM_EXFAT, RAMDISK_CLUSTER_SZ, buf, 0x400000); // Format as exFAT w/ 32KB cluster.
if (!res)
res = f_mount(ram_fs, "ram:", 1); // Mount ramdisk.
free(buf);
return res;
}
int ram_disk_read(u32 sector, u32 sector_count, void *buf)
{
u32 sector_off = RAM_DISK_ADDR + (sector << 9);
u32 bytes_count = sector_count << 9;
if ((sector_off - RAM_DISK_ADDR) > RAM_DISK_SZ)
return 1;
memcpy(buf, (void *)sector_off, bytes_count);
return 0;
}
int ram_disk_write(u32 sector, u32 sector_count, const void *buf)
{
u32 sector_off = RAM_DISK_ADDR + (sector << 9);
u32 bytes_count = sector_count << 9;
if ((sector_off - RAM_DISK_ADDR) > RAM_DISK_SZ)
return 1;
memcpy((void *)sector_off, buf, bytes_count);
return 0;
}

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@ -0,0 +1,30 @@
/*
* Ramdisk driver for Tegra X1
*
* Copyright (c) 2019 CTCaer
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef RAM_DISK_H
#define RAM_DISK_H
#include "../libs/fatfs/ff.h"
#define RAMDISK_CLUSTER_SZ 32768
int ram_disk_init(FATFS *ram_fs);
int ram_disk_read(u32 sector, u32 sector_count, void *buf);
int ram_disk_write(u32 sector, u32 sector_count, const void *buf);
#endif