| // Copyright 2018 The Fuchsia Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "onfi.h" |
| |
| #include <string.h> |
| #include <unistd.h> |
| |
| #include <ddk/debug.h> |
| |
| // Database of settings for the NAND flash devices we support. |
| // Note on chip_delay: chip_delay is the delay after we enqueue certain ONFI |
| // commands (RESET, READSTART). The value of 30us was experimentally picked for |
| // the Samsung NAND, and 20us for the Toshiba NAND. It turns out that a value |
| // of 25us works better for the Micron NAND (25us reduces the number of ECC |
| // errors significantly). |
| // TODO(ZX-2696): Determine the value of chip delay more scientifically. |
| static struct nand_chip_table nand_chip_table[] = { |
| {0x2C, 0xDC, "Micron", "MT29F4G08ABAEA", {20, 16, 15}, 25, true, 512, 0, 0, 0, 0}, |
| {0xEC, 0xDC, "Samsung", "K9F4G08U0F", {25, 20, 15}, 30, true, 512, 0, 0, 0, 0}, |
| /* TODO: This works. but doublecheck Toshiba nand_timings from datasheet */ |
| {0x98, 0xDC, "Toshiba", "TC58NVG2S0F", {25, 20, /* 15 */ 25}, 25, true, 512, 0, 0, 0, 0}, |
| }; |
| |
| #define NAND_CHIP_TABLE_SIZE \ |
| (sizeof(nand_chip_table) / sizeof(struct nand_chip_table)) |
| |
| struct nand_chip_table* Onfi::FindNandChipTable(uint8_t manuf_id, |
| uint8_t device_id) { |
| for (uint32_t i = 0; i < NAND_CHIP_TABLE_SIZE; i++) |
| if (manuf_id == nand_chip_table[i].manufacturer_id && |
| device_id == nand_chip_table[i].device_id) |
| return &nand_chip_table[i]; |
| return NULL; |
| } |
| |
| void Onfi::Init(fbl::Function<void(int32_t cmd, uint32_t ctrl)> cmd_ctrl, |
| fbl::Function<uint8_t()> read_byte) { |
| cmd_ctrl_ = std::move(cmd_ctrl); |
| read_byte_ = std::move(read_byte); |
| } |
| |
| zx_status_t Onfi::OnfiWait(uint32_t timeout_ms) { |
| uint64_t total_time = 0; |
| uint8_t cmd_status; |
| |
| cmd_ctrl_(NAND_CMD_STATUS, NAND_CTRL_CLE | NAND_CTRL_CHANGE); |
| cmd_ctrl_(NAND_CMD_NONE, NAND_NCE | NAND_CTRL_CHANGE); |
| while (!((cmd_status = read_byte_()) & NAND_STATUS_READY)) { |
| usleep(10); |
| total_time += 10; |
| if (total_time > (timeout_ms * 1000)) { |
| break; |
| } |
| } |
| if (!(cmd_status & NAND_STATUS_READY)) { |
| zxlogf(ERROR, "nand command wait timed out\n"); |
| return ZX_ERR_TIMED_OUT; |
| } |
| if (cmd_status & NAND_STATUS_FAIL) { |
| zxlogf(ERROR, "%s: nand command returns error\n", __func__); |
| return ZX_ERR_IO; |
| } |
| return ZX_OK; |
| } |
| |
| void Onfi::OnfiCommand(uint32_t command, int32_t column, int32_t page_addr, |
| uint32_t capacity_mb, uint32_t chip_delay_us, |
| int buswidth_16) { |
| cmd_ctrl_(command, NAND_NCE | NAND_CLE | NAND_CTRL_CHANGE); |
| if (column != -1 || page_addr != -1) { |
| uint32_t ctrl = NAND_CTRL_CHANGE | NAND_NCE | NAND_ALE; |
| |
| if (column != -1) { |
| /* 16 bit buswidth ? */ |
| if (buswidth_16) |
| column >>= 1; |
| cmd_ctrl_(column, ctrl); |
| ctrl &= ~NAND_CTRL_CHANGE; |
| cmd_ctrl_(column >> 8, ctrl); |
| } |
| if (page_addr != -1) { |
| cmd_ctrl_(page_addr, ctrl); |
| cmd_ctrl_(page_addr >> 8, |
| NAND_NCE | NAND_ALE); |
| /* one more address cycle for devices > 128M */ |
| if (capacity_mb > 128) |
| cmd_ctrl_(page_addr >> 16, NAND_NCE | NAND_ALE); |
| } |
| } |
| cmd_ctrl_(NAND_CMD_NONE, NAND_NCE | NAND_CTRL_CHANGE); |
| |
| if (command == NAND_CMD_ERASE1 || command == NAND_CMD_ERASE2 || |
| command == NAND_CMD_SEQIN || command == NAND_CMD_PAGEPROG) |
| return; |
| if (command == NAND_CMD_RESET) { |
| usleep(chip_delay_us); |
| cmd_ctrl_(NAND_CMD_STATUS, NAND_NCE | NAND_CLE | NAND_CTRL_CHANGE); |
| cmd_ctrl_(NAND_CMD_NONE, NAND_NCE | NAND_CTRL_CHANGE); |
| /* We have to busy loop until ready */ |
| while (!(read_byte_() & NAND_STATUS_READY)) |
| ; |
| return; |
| } |
| if (command == NAND_CMD_READ0) { |
| cmd_ctrl_(NAND_CMD_READSTART, NAND_NCE | NAND_CLE | NAND_CTRL_CHANGE); |
| cmd_ctrl_(NAND_CMD_NONE, NAND_NCE | NAND_CTRL_CHANGE); |
| } |
| usleep(chip_delay_us); |
| } |