| /* |
| * TC58128 NAND EEPROM emulation |
| * |
| * Copyright (c) 2005 Samuel Tardieu |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining a copy |
| * of this software and associated documentation files (the "Software"), to deal |
| * in the Software without restriction, including without limitation the rights |
| * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| * copies of the Software, and to permit persons to whom the Software is |
| * furnished to do so, subject to the following conditions: |
| * |
| * The above copyright notice and this permission notice (including the next |
| * paragraph) shall be included in all copies or substantial portions of the |
| * Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
| * THE SOFTWARE. |
| * |
| * SPDX-License-Identifier: MIT |
| */ |
| #include "qemu/osdep.h" |
| #include "qemu/units.h" |
| #include "hw/sh4/sh.h" |
| #include "hw/loader.h" |
| #include "sysemu/qtest.h" |
| #include "qemu/error-report.h" |
| |
| #define CE1 0x0100 |
| #define CE2 0x0200 |
| #define RE 0x0400 |
| #define WE 0x0800 |
| #define ALE 0x1000 |
| #define CLE 0x2000 |
| #define RDY1 0x4000 |
| #define RDY2 0x8000 |
| #define RDY(n) ((n) == 0 ? RDY1 : RDY2) |
| |
| typedef enum { WAIT, READ1, READ2, READ3 } state_t; |
| |
| typedef struct { |
| uint8_t *flash_contents; |
| state_t state; |
| uint32_t address; |
| uint8_t address_cycle; |
| } tc58128_dev; |
| |
| static tc58128_dev tc58128_devs[2]; |
| |
| #define FLASH_SIZE (16 * MiB) |
| |
| static void init_dev(tc58128_dev * dev, const char *filename) |
| { |
| int ret, blocks; |
| |
| dev->state = WAIT; |
| dev->flash_contents = g_malloc(FLASH_SIZE); |
| memset(dev->flash_contents, 0xff, FLASH_SIZE); |
| if (filename) { |
| /* Load flash image skipping the first block */ |
| ret = load_image_size(filename, dev->flash_contents + 528 * 32, |
| FLASH_SIZE - 528 * 32); |
| if (ret < 0) { |
| if (!qtest_enabled()) { |
| error_report("Could not load flash image %s", filename); |
| exit(1); |
| } |
| } else { |
| /* Build first block with number of blocks */ |
| blocks = DIV_ROUND_UP(ret, 528 * 32); |
| dev->flash_contents[0] = blocks & 0xff; |
| dev->flash_contents[1] = (blocks >> 8) & 0xff; |
| dev->flash_contents[2] = (blocks >> 16) & 0xff; |
| dev->flash_contents[3] = (blocks >> 24) & 0xff; |
| fprintf(stderr, "loaded %d bytes for %s into flash\n", ret, |
| filename); |
| } |
| } |
| } |
| |
| static void handle_command(tc58128_dev * dev, uint8_t command) |
| { |
| switch (command) { |
| case 0xff: |
| fprintf(stderr, "reset flash device\n"); |
| dev->state = WAIT; |
| break; |
| case 0x00: |
| fprintf(stderr, "read mode 1\n"); |
| dev->state = READ1; |
| dev->address_cycle = 0; |
| break; |
| case 0x01: |
| fprintf(stderr, "read mode 2\n"); |
| dev->state = READ2; |
| dev->address_cycle = 0; |
| break; |
| case 0x50: |
| fprintf(stderr, "read mode 3\n"); |
| dev->state = READ3; |
| dev->address_cycle = 0; |
| break; |
| default: |
| fprintf(stderr, "unknown flash command 0x%02x\n", command); |
| abort(); |
| } |
| } |
| |
| static void handle_address(tc58128_dev * dev, uint8_t data) |
| { |
| switch (dev->state) { |
| case READ1: |
| case READ2: |
| case READ3: |
| switch (dev->address_cycle) { |
| case 0: |
| dev->address = data; |
| if (dev->state == READ2) |
| dev->address |= 0x100; |
| else if (dev->state == READ3) |
| dev->address |= 0x200; |
| break; |
| case 1: |
| dev->address += data * 528 * 0x100; |
| break; |
| case 2: |
| dev->address += data * 528; |
| fprintf(stderr, "address pointer in flash: 0x%08x\n", |
| dev->address); |
| break; |
| default: |
| /* Invalid data */ |
| abort(); |
| } |
| dev->address_cycle++; |
| break; |
| default: |
| abort(); |
| } |
| } |
| |
| static uint8_t handle_read(tc58128_dev * dev) |
| { |
| #if 0 |
| if (dev->address % 0x100000 == 0) |
| fprintf(stderr, "reading flash at address 0x%08x\n", dev->address); |
| #endif |
| return dev->flash_contents[dev->address++]; |
| } |
| |
| /* We never mark the device as busy, so interrupts cannot be triggered |
| XXXXX */ |
| |
| static int tc58128_cb(uint16_t porta, uint16_t portb, |
| uint16_t * periph_pdtra, uint16_t * periph_portadir, |
| uint16_t * periph_pdtrb, uint16_t * periph_portbdir) |
| { |
| int dev; |
| |
| if ((porta & CE1) == 0) |
| dev = 0; |
| else if ((porta & CE2) == 0) |
| dev = 1; |
| else |
| return 0; /* No device selected */ |
| |
| if ((porta & RE) && (porta & WE)) { |
| /* Nothing to do, assert ready and return to input state */ |
| *periph_portadir &= 0xff00; |
| *periph_portadir |= RDY(dev); |
| *periph_pdtra |= RDY(dev); |
| return 1; |
| } |
| |
| if (porta & CLE) { |
| /* Command */ |
| assert((porta & WE) == 0); |
| handle_command(&tc58128_devs[dev], porta & 0x00ff); |
| } else if (porta & ALE) { |
| assert((porta & WE) == 0); |
| handle_address(&tc58128_devs[dev], porta & 0x00ff); |
| } else if ((porta & RE) == 0) { |
| *periph_portadir |= 0x00ff; |
| *periph_pdtra &= 0xff00; |
| *periph_pdtra |= handle_read(&tc58128_devs[dev]); |
| } else { |
| abort(); |
| } |
| return 1; |
| } |
| |
| static sh7750_io_device tc58128 = { |
| RE | WE, /* Port A triggers */ |
| 0, /* Port B triggers */ |
| tc58128_cb /* Callback */ |
| }; |
| |
| int tc58128_init(struct SH7750State *s, const char *zone1, const char *zone2) |
| { |
| warn_report_once("The TC58128 flash device is deprecated"); |
| init_dev(&tc58128_devs[0], zone1); |
| init_dev(&tc58128_devs[1], zone2); |
| return sh7750_register_io_device(s, &tc58128); |
| } |
