diff options
Diffstat (limited to 'qemu/hw/sd/milkymist-memcard.c')
| -rw-r--r-- | qemu/hw/sd/milkymist-memcard.c | 317 |
1 files changed, 0 insertions, 317 deletions
diff --git a/qemu/hw/sd/milkymist-memcard.c b/qemu/hw/sd/milkymist-memcard.c deleted file mode 100644 index c04ff02fa..000000000 --- a/qemu/hw/sd/milkymist-memcard.c +++ /dev/null @@ -1,317 +0,0 @@ -/* - * QEMU model of the Milkymist SD Card Controller. - * - * Copyright (c) 2010 Michael Walle <michael@walle.cc> - * - * This library is free software; you can redistribute it and/or - * modify it under the terms of the GNU Lesser General Public - * License as published by the Free Software Foundation; either - * version 2 of the License, or (at your option) any later version. - * - * This library is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * Lesser General Public License for more details. - * - * You should have received a copy of the GNU Lesser General Public - * License along with this library; if not, see <http://www.gnu.org/licenses/>. - * - * - * Specification available at: - * http://www.milkymist.org/socdoc/memcard.pdf - */ - -#include "qemu/osdep.h" -#include "hw/hw.h" -#include "hw/sysbus.h" -#include "sysemu/sysemu.h" -#include "trace.h" -#include "qemu/error-report.h" -#include "sysemu/block-backend.h" -#include "sysemu/blockdev.h" -#include "hw/sd/sd.h" - -enum { - ENABLE_CMD_TX = (1<<0), - ENABLE_CMD_RX = (1<<1), - ENABLE_DAT_TX = (1<<2), - ENABLE_DAT_RX = (1<<3), -}; - -enum { - PENDING_CMD_TX = (1<<0), - PENDING_CMD_RX = (1<<1), - PENDING_DAT_TX = (1<<2), - PENDING_DAT_RX = (1<<3), -}; - -enum { - START_CMD_TX = (1<<0), - START_DAT_RX = (1<<1), -}; - -enum { - R_CLK2XDIV = 0, - R_ENABLE, - R_PENDING, - R_START, - R_CMD, - R_DAT, - R_MAX -}; - -#define TYPE_MILKYMIST_MEMCARD "milkymist-memcard" -#define MILKYMIST_MEMCARD(obj) \ - OBJECT_CHECK(MilkymistMemcardState, (obj), TYPE_MILKYMIST_MEMCARD) - -struct MilkymistMemcardState { - SysBusDevice parent_obj; - - MemoryRegion regs_region; - SDState *card; - - int command_write_ptr; - int response_read_ptr; - int response_len; - int ignore_next_cmd; - int enabled; - uint8_t command[6]; - uint8_t response[17]; - uint32_t regs[R_MAX]; -}; -typedef struct MilkymistMemcardState MilkymistMemcardState; - -static void update_pending_bits(MilkymistMemcardState *s) -{ - /* transmits are instantaneous, thus tx pending bits are never set */ - s->regs[R_PENDING] = 0; - /* if rx is enabled the corresponding pending bits are always set */ - if (s->regs[R_ENABLE] & ENABLE_CMD_RX) { - s->regs[R_PENDING] |= PENDING_CMD_RX; - } - if (s->regs[R_ENABLE] & ENABLE_DAT_RX) { - s->regs[R_PENDING] |= PENDING_DAT_RX; - } -} - -static void memcard_sd_command(MilkymistMemcardState *s) -{ - SDRequest req; - - req.cmd = s->command[0] & 0x3f; - req.arg = (s->command[1] << 24) | (s->command[2] << 16) - | (s->command[3] << 8) | s->command[4]; - req.crc = s->command[5]; - - s->response[0] = req.cmd; - s->response_len = sd_do_command(s->card, &req, s->response+1); - s->response_read_ptr = 0; - - if (s->response_len == 16) { - /* R2 response */ - s->response[0] = 0x3f; - s->response_len += 1; - } else if (s->response_len == 4) { - /* no crc calculation, insert dummy byte */ - s->response[5] = 0; - s->response_len += 2; - } - - if (req.cmd == 0) { - /* next write is a dummy byte to clock the initialization of the sd - * card */ - s->ignore_next_cmd = 1; - } -} - -static uint64_t memcard_read(void *opaque, hwaddr addr, - unsigned size) -{ - MilkymistMemcardState *s = opaque; - uint32_t r = 0; - - addr >>= 2; - switch (addr) { - case R_CMD: - if (!s->enabled) { - r = 0xff; - } else { - r = s->response[s->response_read_ptr++]; - if (s->response_read_ptr > s->response_len) { - error_report("milkymist_memcard: " - "read more cmd bytes than available. Clipping."); - s->response_read_ptr = 0; - } - } - break; - case R_DAT: - if (!s->enabled) { - r = 0xffffffff; - } else { - r = 0; - r |= sd_read_data(s->card) << 24; - r |= sd_read_data(s->card) << 16; - r |= sd_read_data(s->card) << 8; - r |= sd_read_data(s->card); - } - break; - case R_CLK2XDIV: - case R_ENABLE: - case R_PENDING: - case R_START: - r = s->regs[addr]; - break; - - default: - error_report("milkymist_memcard: read access to unknown register 0x" - TARGET_FMT_plx, addr << 2); - break; - } - - trace_milkymist_memcard_memory_read(addr << 2, r); - - return r; -} - -static void memcard_write(void *opaque, hwaddr addr, uint64_t value, - unsigned size) -{ - MilkymistMemcardState *s = opaque; - - trace_milkymist_memcard_memory_write(addr, value); - - addr >>= 2; - switch (addr) { - case R_PENDING: - /* clear rx pending bits */ - s->regs[R_PENDING] &= ~(value & (PENDING_CMD_RX | PENDING_DAT_RX)); - update_pending_bits(s); - break; - case R_CMD: - if (!s->enabled) { - break; - } - if (s->ignore_next_cmd) { - s->ignore_next_cmd = 0; - break; - } - s->command[s->command_write_ptr] = value & 0xff; - s->command_write_ptr = (s->command_write_ptr + 1) % 6; - if (s->command_write_ptr == 0) { - memcard_sd_command(s); - } - break; - case R_DAT: - if (!s->enabled) { - break; - } - sd_write_data(s->card, (value >> 24) & 0xff); - sd_write_data(s->card, (value >> 16) & 0xff); - sd_write_data(s->card, (value >> 8) & 0xff); - sd_write_data(s->card, value & 0xff); - break; - case R_ENABLE: - s->regs[addr] = value; - update_pending_bits(s); - break; - case R_CLK2XDIV: - case R_START: - s->regs[addr] = value; - break; - - default: - error_report("milkymist_memcard: write access to unknown register 0x" - TARGET_FMT_plx, addr << 2); - break; - } -} - -static const MemoryRegionOps memcard_mmio_ops = { - .read = memcard_read, - .write = memcard_write, - .valid = { - .min_access_size = 4, - .max_access_size = 4, - }, - .endianness = DEVICE_NATIVE_ENDIAN, -}; - -static void milkymist_memcard_reset(DeviceState *d) -{ - MilkymistMemcardState *s = MILKYMIST_MEMCARD(d); - int i; - - s->command_write_ptr = 0; - s->response_read_ptr = 0; - s->response_len = 0; - - for (i = 0; i < R_MAX; i++) { - s->regs[i] = 0; - } -} - -static int milkymist_memcard_init(SysBusDevice *dev) -{ - MilkymistMemcardState *s = MILKYMIST_MEMCARD(dev); - DriveInfo *dinfo; - BlockBackend *blk; - - /* FIXME use a qdev drive property instead of drive_get_next() */ - dinfo = drive_get_next(IF_SD); - blk = dinfo ? blk_by_legacy_dinfo(dinfo) : NULL; - s->card = sd_init(blk, false); - if (s->card == NULL) { - return -1; - } - - s->enabled = blk && blk_is_inserted(blk); - - memory_region_init_io(&s->regs_region, OBJECT(s), &memcard_mmio_ops, s, - "milkymist-memcard", R_MAX * 4); - sysbus_init_mmio(dev, &s->regs_region); - - return 0; -} - -static const VMStateDescription vmstate_milkymist_memcard = { - .name = "milkymist-memcard", - .version_id = 1, - .minimum_version_id = 1, - .fields = (VMStateField[]) { - VMSTATE_INT32(command_write_ptr, MilkymistMemcardState), - VMSTATE_INT32(response_read_ptr, MilkymistMemcardState), - VMSTATE_INT32(response_len, MilkymistMemcardState), - VMSTATE_INT32(ignore_next_cmd, MilkymistMemcardState), - VMSTATE_INT32(enabled, MilkymistMemcardState), - VMSTATE_UINT8_ARRAY(command, MilkymistMemcardState, 6), - VMSTATE_UINT8_ARRAY(response, MilkymistMemcardState, 17), - VMSTATE_UINT32_ARRAY(regs, MilkymistMemcardState, R_MAX), - VMSTATE_END_OF_LIST() - } -}; - -static void milkymist_memcard_class_init(ObjectClass *klass, void *data) -{ - DeviceClass *dc = DEVICE_CLASS(klass); - SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass); - - k->init = milkymist_memcard_init; - dc->reset = milkymist_memcard_reset; - dc->vmsd = &vmstate_milkymist_memcard; - /* Reason: init() method uses drive_get_next() */ - dc->cannot_instantiate_with_device_add_yet = true; -} - -static const TypeInfo milkymist_memcard_info = { - .name = TYPE_MILKYMIST_MEMCARD, - .parent = TYPE_SYS_BUS_DEVICE, - .instance_size = sizeof(MilkymistMemcardState), - .class_init = milkymist_memcard_class_init, -}; - -static void milkymist_memcard_register_types(void) -{ - type_register_static(&milkymist_memcard_info); -} - -type_init(milkymist_memcard_register_types) |