blob: c8e825d6aee0ebe150ae02047635fc59623d7322 [file] [log] [blame]
/*
* Copyright (c) 2017-2018, ARM Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <arch_helpers.h>
#include <debug.h>
#include <io/io_block.h>
#include <mmio.h>
#include <platform_def.h>
#include <stdint.h>
#include <utils_def.h>
#include "uniphier.h"
#define DIV_ROUND_UP(n, d) (((n) + (d) - 1) / (d))
#define NAND_CMD_READ0 0
#define NAND_CMD_READSTART 0x30
#define DENALI_ECC_ENABLE 0x0e0
#define DENALI_PAGES_PER_BLOCK 0x150
#define DENALI_DEVICE_MAIN_AREA_SIZE 0x170
#define DENALI_DEVICE_SPARE_AREA_SIZE 0x180
#define DENALI_TWO_ROW_ADDR_CYCLES 0x190
#define DENALI_INTR_STATUS0 0x410
#define DENALI_INTR_ECC_UNCOR_ERR BIT(1)
#define DENALI_INTR_DMA_CMD_COMP BIT(2)
#define DENALI_INTR_INT_ACT BIT(12)
#define DENALI_DMA_ENABLE 0x700
#define DENALI_HOST_ADDR 0x00
#define DENALI_HOST_DATA 0x10
#define DENALI_MAP01 (1 << 26)
#define DENALI_MAP10 (2 << 26)
#define DENALI_MAP11 (3 << 26)
#define DENALI_MAP11_CMD ((DENALI_MAP11) | 0)
#define DENALI_MAP11_ADDR ((DENALI_MAP11) | 1)
#define DENALI_MAP11_DATA ((DENALI_MAP11) | 2)
#define DENALI_ACCESS_DEFAULT_AREA 0x42
#define UNIPHIER_NAND_BBT_UNKNOWN 0xff
struct uniphier_nand {
uintptr_t host_base;
uintptr_t reg_base;
int pages_per_block;
int page_size;
int two_row_addr_cycles;
uint8_t bbt[16];
};
struct uniphier_nand uniphier_nand;
static void uniphier_nand_host_write(struct uniphier_nand *nand,
uint32_t addr, uint32_t data)
{
mmio_write_32(nand->host_base + DENALI_HOST_ADDR, addr);
mmio_write_32(nand->host_base + DENALI_HOST_DATA, data);
}
static uint32_t uniphier_nand_host_read(struct uniphier_nand *nand,
uint32_t addr)
{
mmio_write_32(nand->host_base + DENALI_HOST_ADDR, addr);
return mmio_read_32(nand->host_base + DENALI_HOST_DATA);
}
static int uniphier_nand_block_isbad(struct uniphier_nand *nand, int block)
{
int page = nand->pages_per_block * block;
int column = nand->page_size;
uint8_t bbm;
uint32_t status;
int is_bad;
/* use cache if available */
if (block < ARRAY_SIZE(nand->bbt) &&
nand->bbt[block] != UNIPHIER_NAND_BBT_UNKNOWN)
return nand->bbt[block];
mmio_write_32(nand->reg_base + DENALI_ECC_ENABLE, 0);
mmio_write_32(nand->reg_base + DENALI_INTR_STATUS0, -1);
uniphier_nand_host_write(nand, DENALI_MAP11_CMD, NAND_CMD_READ0);
uniphier_nand_host_write(nand, DENALI_MAP11_ADDR, column & 0xff);
uniphier_nand_host_write(nand, DENALI_MAP11_ADDR, (column >> 8) & 0xff);
uniphier_nand_host_write(nand, DENALI_MAP11_ADDR, page & 0xff);
uniphier_nand_host_write(nand, DENALI_MAP11_ADDR, (page >> 8) & 0xff);
if (!nand->two_row_addr_cycles)
uniphier_nand_host_write(nand, DENALI_MAP11_ADDR,
(page >> 16) & 0xff);
uniphier_nand_host_write(nand, DENALI_MAP11_CMD, NAND_CMD_READSTART);
do {
status = mmio_read_32(nand->reg_base + DENALI_INTR_STATUS0);
} while (!(status & DENALI_INTR_INT_ACT));
bbm = uniphier_nand_host_read(nand, DENALI_MAP11_DATA);
is_bad = bbm != 0xff;
/* if possible, save the result for future re-use */
if (block < ARRAY_SIZE(nand->bbt))
nand->bbt[block] = is_bad;
if (is_bad)
WARN("found bad block at %d. skip.\n", block);
return is_bad;
}
static int uniphier_nand_read_pages(struct uniphier_nand *nand, uintptr_t buf,
int page_start, int page_count)
{
uint32_t status;
mmio_write_32(nand->reg_base + DENALI_ECC_ENABLE, 1);
mmio_write_32(nand->reg_base + DENALI_DMA_ENABLE, 1);
mmio_write_32(nand->reg_base + DENALI_INTR_STATUS0, -1);
/* use Data DMA (64bit) */
mmio_write_32(nand->host_base + DENALI_HOST_ADDR,
DENALI_MAP10 | page_start);
/*
* 1. setup transfer type, interrupt when complete,
* burst len = 64 bytes, the number of pages
*/
mmio_write_32(nand->host_base + DENALI_HOST_DATA,
0x01002000 | (64 << 16) | page_count);
/* 2. set memory low address */
mmio_write_32(nand->host_base + DENALI_HOST_DATA, buf);
/* 3. set memory high address */
mmio_write_32(nand->host_base + DENALI_HOST_DATA, buf >> 32);
do {
status = mmio_read_32(nand->reg_base + DENALI_INTR_STATUS0);
} while (!(status & DENALI_INTR_DMA_CMD_COMP));
mmio_write_32(nand->reg_base + DENALI_DMA_ENABLE, 0);
if (status & DENALI_INTR_ECC_UNCOR_ERR) {
ERROR("uncorrectable error in page range %d-%d",
page_start, page_start + page_count - 1);
return -EBADMSG;
}
return 0;
}
static size_t __uniphier_nand_read(struct uniphier_nand *nand, int lba,
uintptr_t buf, size_t size)
{
int pages_per_block = nand->pages_per_block;
int page_size = nand->page_size;
int blocks_to_skip = lba / pages_per_block;
int pages_to_read = DIV_ROUND_UP(size, page_size);
int page = lba % pages_per_block;
int block = 0;
uintptr_t p = buf;
int page_count, ret;
while (blocks_to_skip) {
ret = uniphier_nand_block_isbad(nand, block);
if (ret < 0)
goto out;
if (!ret)
blocks_to_skip--;
block++;
}
while (pages_to_read) {
ret = uniphier_nand_block_isbad(nand, block);
if (ret < 0)
goto out;
if (ret) {
block++;
continue;
}
page_count = MIN(pages_per_block - page, pages_to_read);
ret = uniphier_nand_read_pages(nand, p,
block * pages_per_block + page,
page_count);
if (ret)
goto out;
block++;
page = 0;
p += page_size * page_count;
pages_to_read -= page_count;
}
out:
/* number of read bytes */
return MIN(size, p - buf);
}
static size_t uniphier_nand_read(int lba, uintptr_t buf, size_t size)
{
size_t count;
inv_dcache_range(buf, size);
count = __uniphier_nand_read(&uniphier_nand, lba, buf, size);
inv_dcache_range(buf, size);
return count;
}
static struct io_block_dev_spec uniphier_nand_dev_spec = {
.buffer = {
.offset = UNIPHIER_BLOCK_BUF_BASE,
.length = UNIPHIER_BLOCK_BUF_SIZE,
},
.ops = {
.read = uniphier_nand_read,
},
/* fill .block_size at run-time */
};
static int uniphier_nand_hw_init(struct uniphier_nand *nand)
{
int i;
for (i = 0; i < ARRAY_SIZE(nand->bbt); i++)
nand->bbt[i] = UNIPHIER_NAND_BBT_UNKNOWN;
nand->host_base = 0x68000000;
nand->reg_base = 0x68100000;
nand->pages_per_block =
mmio_read_32(nand->reg_base + DENALI_PAGES_PER_BLOCK);
nand->page_size =
mmio_read_32(nand->reg_base + DENALI_DEVICE_MAIN_AREA_SIZE);
if (mmio_read_32(nand->reg_base + DENALI_TWO_ROW_ADDR_CYCLES) & BIT(0))
nand->two_row_addr_cycles = 1;
uniphier_nand_host_write(nand, DENALI_MAP10,
DENALI_ACCESS_DEFAULT_AREA);
return 0;
}
int uniphier_nand_init(uintptr_t *block_dev_spec)
{
int ret;
ret = uniphier_nand_hw_init(&uniphier_nand);
if (ret)
return ret;
uniphier_nand_dev_spec.block_size = uniphier_nand.page_size;
*block_dev_spec = (uintptr_t)&uniphier_nand_dev_spec;
return 0;
}