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qemu-e2k/hw/net/allwinner-sun8i-emac.c
Niek Linnenbank 29d08975d1 hw/arm/allwinner-h3: add EMAC ethernet device 
The Allwinner Sun8i System on Chip family includes an Ethernet MAC (EMAC)
which provides 10M/100M/1000M Ethernet connectivity. This commit
adds support for the Allwinner EMAC from the Sun8i family (H2+, H3, A33, etc),
including emulation for the following functionality:

 * DMA transfers
 * MII interface
 * Transmit CRC calculation

Signed-off-by: Niek Linnenbank <nieklinnenbank@gmail.com>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Message-id: 20200311221854.30370-10-nieklinnenbank@gmail.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2020-03-12 16:27:33 +00:00

872 lines
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/*
* Allwinner Sun8i Ethernet MAC emulation
*
* Copyright (C) 2019 Niek Linnenbank <nieklinnenbank@gmail.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 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 "qemu/osdep.h"
#include "qemu/units.h"
#include "hw/sysbus.h"
#include "migration/vmstate.h"
#include "net/net.h"
#include "hw/irq.h"
#include "hw/qdev-properties.h"
#include "qemu/log.h"
#include "trace.h"
#include "net/checksum.h"
#include "qemu/module.h"
#include "exec/cpu-common.h"
#include "hw/net/allwinner-sun8i-emac.h"
/* EMAC register offsets */
enum {
REG_BASIC_CTL_0 = 0x0000, /* Basic Control 0 */
REG_BASIC_CTL_1 = 0x0004, /* Basic Control 1 */
REG_INT_STA = 0x0008, /* Interrupt Status */
REG_INT_EN = 0x000C, /* Interrupt Enable */
REG_TX_CTL_0 = 0x0010, /* Transmit Control 0 */
REG_TX_CTL_1 = 0x0014, /* Transmit Control 1 */
REG_TX_FLOW_CTL = 0x001C, /* Transmit Flow Control */
REG_TX_DMA_DESC_LIST = 0x0020, /* Transmit Descriptor List Address */
REG_RX_CTL_0 = 0x0024, /* Receive Control 0 */
REG_RX_CTL_1 = 0x0028, /* Receive Control 1 */
REG_RX_DMA_DESC_LIST = 0x0034, /* Receive Descriptor List Address */
REG_FRM_FLT = 0x0038, /* Receive Frame Filter */
REG_RX_HASH_0 = 0x0040, /* Receive Hash Table 0 */
REG_RX_HASH_1 = 0x0044, /* Receive Hash Table 1 */
REG_MII_CMD = 0x0048, /* Management Interface Command */
REG_MII_DATA = 0x004C, /* Management Interface Data */
REG_ADDR_HIGH = 0x0050, /* MAC Address High */
REG_ADDR_LOW = 0x0054, /* MAC Address Low */
REG_TX_DMA_STA = 0x00B0, /* Transmit DMA Status */
REG_TX_CUR_DESC = 0x00B4, /* Transmit Current Descriptor */
REG_TX_CUR_BUF = 0x00B8, /* Transmit Current Buffer */
REG_RX_DMA_STA = 0x00C0, /* Receive DMA Status */
REG_RX_CUR_DESC = 0x00C4, /* Receive Current Descriptor */
REG_RX_CUR_BUF = 0x00C8, /* Receive Current Buffer */
REG_RGMII_STA = 0x00D0, /* RGMII Status */
};
/* EMAC register flags */
enum {
BASIC_CTL0_100Mbps = (0b11 << 2),
BASIC_CTL0_FD = (1 << 0),
BASIC_CTL1_SOFTRST = (1 << 0),
};
enum {
INT_STA_RGMII_LINK = (1 << 16),
INT_STA_RX_EARLY = (1 << 13),
INT_STA_RX_OVERFLOW = (1 << 12),
INT_STA_RX_TIMEOUT = (1 << 11),
INT_STA_RX_DMA_STOP = (1 << 10),
INT_STA_RX_BUF_UA = (1 << 9),
INT_STA_RX = (1 << 8),
INT_STA_TX_EARLY = (1 << 5),
INT_STA_TX_UNDERFLOW = (1 << 4),
INT_STA_TX_TIMEOUT = (1 << 3),
INT_STA_TX_BUF_UA = (1 << 2),
INT_STA_TX_DMA_STOP = (1 << 1),
INT_STA_TX = (1 << 0),
};
enum {
INT_EN_RX_EARLY = (1 << 13),
INT_EN_RX_OVERFLOW = (1 << 12),
INT_EN_RX_TIMEOUT = (1 << 11),
INT_EN_RX_DMA_STOP = (1 << 10),
INT_EN_RX_BUF_UA = (1 << 9),
INT_EN_RX = (1 << 8),
INT_EN_TX_EARLY = (1 << 5),
INT_EN_TX_UNDERFLOW = (1 << 4),
INT_EN_TX_TIMEOUT = (1 << 3),
INT_EN_TX_BUF_UA = (1 << 2),
INT_EN_TX_DMA_STOP = (1 << 1),
INT_EN_TX = (1 << 0),
};
enum {
TX_CTL0_TX_EN = (1 << 31),
TX_CTL1_TX_DMA_START = (1 << 31),
TX_CTL1_TX_DMA_EN = (1 << 30),
TX_CTL1_TX_FLUSH = (1 << 0),
};
enum {
RX_CTL0_RX_EN = (1 << 31),
RX_CTL0_STRIP_FCS = (1 << 28),
RX_CTL0_CRC_IPV4 = (1 << 27),
};
enum {
RX_CTL1_RX_DMA_START = (1 << 31),
RX_CTL1_RX_DMA_EN = (1 << 30),
RX_CTL1_RX_MD = (1 << 1),
};
enum {
RX_FRM_FLT_DIS_ADDR = (1 << 31),
};
enum {
MII_CMD_PHY_ADDR_SHIFT = (12),
MII_CMD_PHY_ADDR_MASK = (0xf000),
MII_CMD_PHY_REG_SHIFT = (4),
MII_CMD_PHY_REG_MASK = (0xf0),
MII_CMD_PHY_RW = (1 << 1),
MII_CMD_PHY_BUSY = (1 << 0),
};
enum {
TX_DMA_STA_STOP = (0b000),
TX_DMA_STA_RUN_FETCH = (0b001),
TX_DMA_STA_WAIT_STA = (0b010),
};
enum {
RX_DMA_STA_STOP = (0b000),
RX_DMA_STA_RUN_FETCH = (0b001),
RX_DMA_STA_WAIT_FRM = (0b011),
};
/* EMAC register reset values */
enum {
REG_BASIC_CTL_1_RST = 0x08000000,
};
/* EMAC constants */
enum {
AW_SUN8I_EMAC_MIN_PKT_SZ = 64
};
/* Transmit/receive frame descriptor */
typedef struct FrameDescriptor {
uint32_t status;
uint32_t status2;
uint32_t addr;
uint32_t next;
} FrameDescriptor;
/* Frame descriptor flags */
enum {
DESC_STATUS_CTL = (1 << 31),
DESC_STATUS2_BUF_SIZE_MASK = (0x7ff),
};
/* Transmit frame descriptor flags */
enum {
TX_DESC_STATUS_LENGTH_ERR = (1 << 14),
TX_DESC_STATUS2_FIRST_DESC = (1 << 29),
TX_DESC_STATUS2_LAST_DESC = (1 << 30),
TX_DESC_STATUS2_CHECKSUM_MASK = (0x3 << 27),
};
/* Receive frame descriptor flags */
enum {
RX_DESC_STATUS_FIRST_DESC = (1 << 9),
RX_DESC_STATUS_LAST_DESC = (1 << 8),
RX_DESC_STATUS_FRM_LEN_MASK = (0x3fff0000),
RX_DESC_STATUS_FRM_LEN_SHIFT = (16),
RX_DESC_STATUS_NO_BUF = (1 << 14),
RX_DESC_STATUS_HEADER_ERR = (1 << 7),
RX_DESC_STATUS_LENGTH_ERR = (1 << 4),
RX_DESC_STATUS_CRC_ERR = (1 << 1),
RX_DESC_STATUS_PAYLOAD_ERR = (1 << 0),
RX_DESC_STATUS2_RX_INT_CTL = (1 << 31),
};
/* MII register offsets */
enum {
MII_REG_CR = (0x0), /* Control */
MII_REG_ST = (0x1), /* Status */
MII_REG_ID_HIGH = (0x2), /* Identifier High */
MII_REG_ID_LOW = (0x3), /* Identifier Low */
MII_REG_ADV = (0x4), /* Advertised abilities */
MII_REG_LPA = (0x5), /* Link partner abilities */
};
/* MII register flags */
enum {
MII_REG_CR_RESET = (1 << 15),
MII_REG_CR_POWERDOWN = (1 << 11),
MII_REG_CR_10Mbit = (0),
MII_REG_CR_100Mbit = (1 << 13),
MII_REG_CR_1000Mbit = (1 << 6),
MII_REG_CR_AUTO_NEG = (1 << 12),
MII_REG_CR_AUTO_NEG_RESTART = (1 << 9),
MII_REG_CR_FULLDUPLEX = (1 << 8),
};
enum {
MII_REG_ST_100BASE_T4 = (1 << 15),
MII_REG_ST_100BASE_X_FD = (1 << 14),
MII_REG_ST_100BASE_X_HD = (1 << 13),
MII_REG_ST_10_FD = (1 << 12),
MII_REG_ST_10_HD = (1 << 11),
MII_REG_ST_100BASE_T2_FD = (1 << 10),
MII_REG_ST_100BASE_T2_HD = (1 << 9),
MII_REG_ST_AUTONEG_COMPLETE = (1 << 5),
MII_REG_ST_AUTONEG_AVAIL = (1 << 3),
MII_REG_ST_LINK_UP = (1 << 2),
};
enum {
MII_REG_LPA_10_HD = (1 << 5),
MII_REG_LPA_10_FD = (1 << 6),
MII_REG_LPA_100_HD = (1 << 7),
MII_REG_LPA_100_FD = (1 << 8),
MII_REG_LPA_PAUSE = (1 << 10),
MII_REG_LPA_ASYMPAUSE = (1 << 11),
};
/* MII constants */
enum {
MII_PHY_ID_HIGH = 0x0044,
MII_PHY_ID_LOW = 0x1400,
};
static void allwinner_sun8i_emac_mii_set_link(AwSun8iEmacState *s,
bool link_active)
{
if (link_active) {
s->mii_st |= MII_REG_ST_LINK_UP;
} else {
s->mii_st &= ~MII_REG_ST_LINK_UP;
}
}
static void allwinner_sun8i_emac_mii_reset(AwSun8iEmacState *s,
bool link_active)
{
s->mii_cr = MII_REG_CR_100Mbit | MII_REG_CR_AUTO_NEG |
MII_REG_CR_FULLDUPLEX;
s->mii_st = MII_REG_ST_100BASE_T4 | MII_REG_ST_100BASE_X_FD |
MII_REG_ST_100BASE_X_HD | MII_REG_ST_10_FD | MII_REG_ST_10_HD |
MII_REG_ST_100BASE_T2_FD | MII_REG_ST_100BASE_T2_HD |
MII_REG_ST_AUTONEG_COMPLETE | MII_REG_ST_AUTONEG_AVAIL;
s->mii_adv = 0;
allwinner_sun8i_emac_mii_set_link(s, link_active);
}
static void allwinner_sun8i_emac_mii_cmd(AwSun8iEmacState *s)
{
uint8_t addr, reg;
addr = (s->mii_cmd & MII_CMD_PHY_ADDR_MASK) >> MII_CMD_PHY_ADDR_SHIFT;
reg = (s->mii_cmd & MII_CMD_PHY_REG_MASK) >> MII_CMD_PHY_REG_SHIFT;
if (addr != s->mii_phy_addr) {
return;
}
/* Read or write a PHY register? */
if (s->mii_cmd & MII_CMD_PHY_RW) {
trace_allwinner_sun8i_emac_mii_write_reg(reg, s->mii_data);
switch (reg) {
case MII_REG_CR:
if (s->mii_data & MII_REG_CR_RESET) {
allwinner_sun8i_emac_mii_reset(s, s->mii_st &
MII_REG_ST_LINK_UP);
} else {
s->mii_cr = s->mii_data & ~(MII_REG_CR_RESET |
MII_REG_CR_AUTO_NEG_RESTART);
}
break;
case MII_REG_ADV:
s->mii_adv = s->mii_data;
break;
case MII_REG_ID_HIGH:
case MII_REG_ID_LOW:
case MII_REG_LPA:
break;
default:
qemu_log_mask(LOG_UNIMP, "allwinner-h3-emac: write access to "
"unknown MII register 0x%x\n", reg);
break;
}
} else {
switch (reg) {
case MII_REG_CR:
s->mii_data = s->mii_cr;
break;
case MII_REG_ST:
s->mii_data = s->mii_st;
break;
case MII_REG_ID_HIGH:
s->mii_data = MII_PHY_ID_HIGH;
break;
case MII_REG_ID_LOW:
s->mii_data = MII_PHY_ID_LOW;
break;
case MII_REG_ADV:
s->mii_data = s->mii_adv;
break;
case MII_REG_LPA:
s->mii_data = MII_REG_LPA_10_HD | MII_REG_LPA_10_FD |
MII_REG_LPA_100_HD | MII_REG_LPA_100_FD |
MII_REG_LPA_PAUSE | MII_REG_LPA_ASYMPAUSE;
break;
default:
qemu_log_mask(LOG_UNIMP, "allwinner-h3-emac: read access to "
"unknown MII register 0x%x\n", reg);
s->mii_data = 0;
break;
}
trace_allwinner_sun8i_emac_mii_read_reg(reg, s->mii_data);
}
}
static void allwinner_sun8i_emac_update_irq(AwSun8iEmacState *s)
{
qemu_set_irq(s->irq, (s->int_sta & s->int_en) != 0);
}
static uint32_t allwinner_sun8i_emac_next_desc(FrameDescriptor *desc,
size_t min_size)
{
uint32_t paddr = desc->next;
cpu_physical_memory_read(paddr, desc, sizeof(*desc));
if ((desc->status & DESC_STATUS_CTL) &&
(desc->status2 & DESC_STATUS2_BUF_SIZE_MASK) >= min_size) {
return paddr;
} else {
return 0;
}
}
static uint32_t allwinner_sun8i_emac_get_desc(FrameDescriptor *desc,
uint32_t start_addr,
size_t min_size)
{
uint32_t desc_addr = start_addr;
/* Note that the list is a cycle. Last entry points back to the head. */
while (desc_addr != 0) {
cpu_physical_memory_read(desc_addr, desc, sizeof(*desc));
if ((desc->status & DESC_STATUS_CTL) &&
(desc->status2 & DESC_STATUS2_BUF_SIZE_MASK) >= min_size) {
return desc_addr;
} else if (desc->next == start_addr) {
break;
} else {
desc_addr = desc->next;
}
}
return 0;
}
static uint32_t allwinner_sun8i_emac_rx_desc(AwSun8iEmacState *s,
FrameDescriptor *desc,
size_t min_size)
{
return allwinner_sun8i_emac_get_desc(desc, s->rx_desc_curr, min_size);
}
static uint32_t allwinner_sun8i_emac_tx_desc(AwSun8iEmacState *s,
FrameDescriptor *desc,
size_t min_size)
{
return allwinner_sun8i_emac_get_desc(desc, s->tx_desc_head, min_size);
}
static void allwinner_sun8i_emac_flush_desc(FrameDescriptor *desc,
uint32_t phys_addr)
{
cpu_physical_memory_write(phys_addr, desc, sizeof(*desc));
}
static int allwinner_sun8i_emac_can_receive(NetClientState *nc)
{
AwSun8iEmacState *s = qemu_get_nic_opaque(nc);
FrameDescriptor desc;
return (s->rx_ctl0 & RX_CTL0_RX_EN) &&
(allwinner_sun8i_emac_rx_desc(s, &desc, 0) != 0);
}
static ssize_t allwinner_sun8i_emac_receive(NetClientState *nc,
const uint8_t *buf,
size_t size)
{
AwSun8iEmacState *s = qemu_get_nic_opaque(nc);
FrameDescriptor desc;
size_t bytes_left = size;
size_t desc_bytes = 0;
size_t pad_fcs_size = 4;
size_t padding = 0;
if (!(s->rx_ctl0 & RX_CTL0_RX_EN)) {
return -1;
}
s->rx_desc_curr = allwinner_sun8i_emac_rx_desc(s, &desc,
AW_SUN8I_EMAC_MIN_PKT_SZ);
if (!s->rx_desc_curr) {
s->int_sta |= INT_STA_RX_BUF_UA;
}
/* Keep filling RX descriptors until the whole frame is written */
while (s->rx_desc_curr && bytes_left > 0) {
desc.status &= ~DESC_STATUS_CTL;
desc.status &= ~RX_DESC_STATUS_FRM_LEN_MASK;
if (bytes_left == size) {
desc.status |= RX_DESC_STATUS_FIRST_DESC;
}
if ((desc.status2 & DESC_STATUS2_BUF_SIZE_MASK) <
(bytes_left + pad_fcs_size)) {
desc_bytes = desc.status2 & DESC_STATUS2_BUF_SIZE_MASK;
desc.status |= desc_bytes << RX_DESC_STATUS_FRM_LEN_SHIFT;
} else {
padding = pad_fcs_size;
if (bytes_left < AW_SUN8I_EMAC_MIN_PKT_SZ) {
padding += (AW_SUN8I_EMAC_MIN_PKT_SZ - bytes_left);
}
desc_bytes = (bytes_left);
desc.status |= RX_DESC_STATUS_LAST_DESC;
desc.status |= (bytes_left + padding)
<< RX_DESC_STATUS_FRM_LEN_SHIFT;
}
cpu_physical_memory_write(desc.addr, buf, desc_bytes);
allwinner_sun8i_emac_flush_desc(&desc, s->rx_desc_curr);
trace_allwinner_sun8i_emac_receive(s->rx_desc_curr, desc.addr,
desc_bytes);
/* Check if frame needs to raise the receive interrupt */
if (!(desc.status2 & RX_DESC_STATUS2_RX_INT_CTL)) {
s->int_sta |= INT_STA_RX;
}
/* Increment variables */
buf += desc_bytes;
bytes_left -= desc_bytes;
/* Move to the next descriptor */
s->rx_desc_curr = allwinner_sun8i_emac_next_desc(&desc, 64);
if (!s->rx_desc_curr) {
/* Not enough buffer space available */
s->int_sta |= INT_STA_RX_BUF_UA;
s->rx_desc_curr = s->rx_desc_head;
break;
}
}
/* Report receive DMA is finished */
s->rx_ctl1 &= ~RX_CTL1_RX_DMA_START;
allwinner_sun8i_emac_update_irq(s);
return size;
}
static void allwinner_sun8i_emac_transmit(AwSun8iEmacState *s)
{
NetClientState *nc = qemu_get_queue(s->nic);
FrameDescriptor desc;
size_t bytes = 0;
size_t packet_bytes = 0;
size_t transmitted = 0;
static uint8_t packet_buf[2048];
s->tx_desc_curr = allwinner_sun8i_emac_tx_desc(s, &desc, 0);
/* Read all transmit descriptors */
while (s->tx_desc_curr != 0) {
/* Read from physical memory into packet buffer */
bytes = desc.status2 & DESC_STATUS2_BUF_SIZE_MASK;
if (bytes + packet_bytes > sizeof(packet_buf)) {
desc.status |= TX_DESC_STATUS_LENGTH_ERR;
break;
}
cpu_physical_memory_read(desc.addr, packet_buf + packet_bytes, bytes);
packet_bytes += bytes;
desc.status &= ~DESC_STATUS_CTL;
allwinner_sun8i_emac_flush_desc(&desc, s->tx_desc_curr);
/* After the last descriptor, send the packet */
if (desc.status2 & TX_DESC_STATUS2_LAST_DESC) {
if (desc.status2 & TX_DESC_STATUS2_CHECKSUM_MASK) {
net_checksum_calculate(packet_buf, packet_bytes);
}
qemu_send_packet(nc, packet_buf, packet_bytes);
trace_allwinner_sun8i_emac_transmit(s->tx_desc_curr, desc.addr,
bytes);
packet_bytes = 0;
transmitted++;
}
s->tx_desc_curr = allwinner_sun8i_emac_next_desc(&desc, 0);
}
/* Raise transmit completed interrupt */
if (transmitted > 0) {
s->int_sta |= INT_STA_TX;
s->tx_ctl1 &= ~TX_CTL1_TX_DMA_START;
allwinner_sun8i_emac_update_irq(s);
}
}
static void allwinner_sun8i_emac_reset(DeviceState *dev)
{
AwSun8iEmacState *s = AW_SUN8I_EMAC(dev);
NetClientState *nc = qemu_get_queue(s->nic);
trace_allwinner_sun8i_emac_reset();
s->mii_cmd = 0;
s->mii_data = 0;
s->basic_ctl0 = 0;
s->basic_ctl1 = REG_BASIC_CTL_1_RST;
s->int_en = 0;
s->int_sta = 0;
s->frm_flt = 0;
s->rx_ctl0 = 0;
s->rx_ctl1 = RX_CTL1_RX_MD;
s->rx_desc_head = 0;
s->rx_desc_curr = 0;
s->tx_ctl0 = 0;
s->tx_ctl1 = 0;
s->tx_desc_head = 0;
s->tx_desc_curr = 0;
s->tx_flowctl = 0;
allwinner_sun8i_emac_mii_reset(s, !nc->link_down);
}
static uint64_t allwinner_sun8i_emac_read(void *opaque, hwaddr offset,
unsigned size)
{
AwSun8iEmacState *s = AW_SUN8I_EMAC(opaque);
uint64_t value = 0;
FrameDescriptor desc;
switch (offset) {
case REG_BASIC_CTL_0: /* Basic Control 0 */
value = s->basic_ctl0;
break;
case REG_BASIC_CTL_1: /* Basic Control 1 */
value = s->basic_ctl1;
break;
case REG_INT_STA: /* Interrupt Status */
value = s->int_sta;
break;
case REG_INT_EN: /* Interupt Enable */
value = s->int_en;
break;
case REG_TX_CTL_0: /* Transmit Control 0 */
value = s->tx_ctl0;
break;
case REG_TX_CTL_1: /* Transmit Control 1 */
value = s->tx_ctl1;
break;
case REG_TX_FLOW_CTL: /* Transmit Flow Control */
value = s->tx_flowctl;
break;
case REG_TX_DMA_DESC_LIST: /* Transmit Descriptor List Address */
value = s->tx_desc_head;
break;
case REG_RX_CTL_0: /* Receive Control 0 */
value = s->rx_ctl0;
break;
case REG_RX_CTL_1: /* Receive Control 1 */
value = s->rx_ctl1;
break;
case REG_RX_DMA_DESC_LIST: /* Receive Descriptor List Address */
value = s->rx_desc_head;
break;
case REG_FRM_FLT: /* Receive Frame Filter */
value = s->frm_flt;
break;
case REG_RX_HASH_0: /* Receive Hash Table 0 */
case REG_RX_HASH_1: /* Receive Hash Table 1 */
break;
case REG_MII_CMD: /* Management Interface Command */
value = s->mii_cmd;
break;
case REG_MII_DATA: /* Management Interface Data */
value = s->mii_data;
break;
case REG_ADDR_HIGH: /* MAC Address High */
value = *(((uint32_t *) (s->conf.macaddr.a)) + 1);
break;
case REG_ADDR_LOW: /* MAC Address Low */
value = *(uint32_t *) (s->conf.macaddr.a);
break;
case REG_TX_DMA_STA: /* Transmit DMA Status */
break;
case REG_TX_CUR_DESC: /* Transmit Current Descriptor */
value = s->tx_desc_curr;
break;
case REG_TX_CUR_BUF: /* Transmit Current Buffer */
if (s->tx_desc_curr != 0) {
cpu_physical_memory_read(s->tx_desc_curr, &desc, sizeof(desc));
value = desc.addr;
} else {
value = 0;
}
break;
case REG_RX_DMA_STA: /* Receive DMA Status */
break;
case REG_RX_CUR_DESC: /* Receive Current Descriptor */
value = s->rx_desc_curr;
break;
case REG_RX_CUR_BUF: /* Receive Current Buffer */
if (s->rx_desc_curr != 0) {
cpu_physical_memory_read(s->rx_desc_curr, &desc, sizeof(desc));
value = desc.addr;
} else {
value = 0;
}
break;
case REG_RGMII_STA: /* RGMII Status */
break;
default:
qemu_log_mask(LOG_UNIMP, "allwinner-h3-emac: read access to unknown "
"EMAC register 0x" TARGET_FMT_plx "\n",
offset);
}
trace_allwinner_sun8i_emac_read(offset, value);
return value;
}
static void allwinner_sun8i_emac_write(void *opaque, hwaddr offset,
uint64_t value, unsigned size)
{
AwSun8iEmacState *s = AW_SUN8I_EMAC(opaque);
NetClientState *nc = qemu_get_queue(s->nic);
trace_allwinner_sun8i_emac_write(offset, value);
switch (offset) {
case REG_BASIC_CTL_0: /* Basic Control 0 */
s->basic_ctl0 = value;
break;
case REG_BASIC_CTL_1: /* Basic Control 1 */
if (value & BASIC_CTL1_SOFTRST) {
allwinner_sun8i_emac_reset(DEVICE(s));
value &= ~BASIC_CTL1_SOFTRST;
}
s->basic_ctl1 = value;
if (allwinner_sun8i_emac_can_receive(nc)) {
qemu_flush_queued_packets(nc);
}
break;
case REG_INT_STA: /* Interrupt Status */
s->int_sta &= ~value;
allwinner_sun8i_emac_update_irq(s);
break;
case REG_INT_EN: /* Interrupt Enable */
s->int_en = value;
allwinner_sun8i_emac_update_irq(s);
break;
case REG_TX_CTL_0: /* Transmit Control 0 */
s->tx_ctl0 = value;
break;
case REG_TX_CTL_1: /* Transmit Control 1 */
s->tx_ctl1 = value;
if (value & TX_CTL1_TX_DMA_EN) {
allwinner_sun8i_emac_transmit(s);
}
break;
case REG_TX_FLOW_CTL: /* Transmit Flow Control */
s->tx_flowctl = value;
break;
case REG_TX_DMA_DESC_LIST: /* Transmit Descriptor List Address */
s->tx_desc_head = value;
s->tx_desc_curr = value;
break;
case REG_RX_CTL_0: /* Receive Control 0 */
s->rx_ctl0 = value;
break;
case REG_RX_CTL_1: /* Receive Control 1 */
s->rx_ctl1 = value | RX_CTL1_RX_MD;
if ((value & RX_CTL1_RX_DMA_EN) &&
allwinner_sun8i_emac_can_receive(nc)) {
qemu_flush_queued_packets(nc);
}
break;
case REG_RX_DMA_DESC_LIST: /* Receive Descriptor List Address */
s->rx_desc_head = value;
s->rx_desc_curr = value;
break;
case REG_FRM_FLT: /* Receive Frame Filter */
s->frm_flt = value;
break;
case REG_RX_HASH_0: /* Receive Hash Table 0 */
case REG_RX_HASH_1: /* Receive Hash Table 1 */
break;
case REG_MII_CMD: /* Management Interface Command */
s->mii_cmd = value & ~MII_CMD_PHY_BUSY;
allwinner_sun8i_emac_mii_cmd(s);
break;
case REG_MII_DATA: /* Management Interface Data */
s->mii_data = value;
break;
case REG_ADDR_HIGH: /* MAC Address High */
s->conf.macaddr.a[4] = (value & 0xff);
s->conf.macaddr.a[5] = (value & 0xff00) >> 8;
break;
case REG_ADDR_LOW: /* MAC Address Low */
s->conf.macaddr.a[0] = (value & 0xff);
s->conf.macaddr.a[1] = (value & 0xff00) >> 8;
s->conf.macaddr.a[2] = (value & 0xff0000) >> 16;
s->conf.macaddr.a[3] = (value & 0xff000000) >> 24;
break;
case REG_TX_DMA_STA: /* Transmit DMA Status */
case REG_TX_CUR_DESC: /* Transmit Current Descriptor */
case REG_TX_CUR_BUF: /* Transmit Current Buffer */
case REG_RX_DMA_STA: /* Receive DMA Status */
case REG_RX_CUR_DESC: /* Receive Current Descriptor */
case REG_RX_CUR_BUF: /* Receive Current Buffer */
case REG_RGMII_STA: /* RGMII Status */
break;
default:
qemu_log_mask(LOG_UNIMP, "allwinner-h3-emac: write access to unknown "
"EMAC register 0x" TARGET_FMT_plx "\n",
offset);
}
}
static void allwinner_sun8i_emac_set_link(NetClientState *nc)
{
AwSun8iEmacState *s = qemu_get_nic_opaque(nc);
trace_allwinner_sun8i_emac_set_link(!nc->link_down);
allwinner_sun8i_emac_mii_set_link(s, !nc->link_down);
}
static const MemoryRegionOps allwinner_sun8i_emac_mem_ops = {
.read = allwinner_sun8i_emac_read,
.write = allwinner_sun8i_emac_write,
.endianness = DEVICE_NATIVE_ENDIAN,
.valid = {
.min_access_size = 4,
.max_access_size = 4,
},
.impl.min_access_size = 4,
};
static NetClientInfo net_allwinner_sun8i_emac_info = {
.type = NET_CLIENT_DRIVER_NIC,
.size = sizeof(NICState),
.can_receive = allwinner_sun8i_emac_can_receive,
.receive = allwinner_sun8i_emac_receive,
.link_status_changed = allwinner_sun8i_emac_set_link,
};
static void allwinner_sun8i_emac_init(Object *obj)
{
SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
AwSun8iEmacState *s = AW_SUN8I_EMAC(obj);
memory_region_init_io(&s->iomem, OBJECT(s), &allwinner_sun8i_emac_mem_ops,
s, TYPE_AW_SUN8I_EMAC, 64 * KiB);
sysbus_init_mmio(sbd, &s->iomem);
sysbus_init_irq(sbd, &s->irq);
}
static void allwinner_sun8i_emac_realize(DeviceState *dev, Error **errp)
{
AwSun8iEmacState *s = AW_SUN8I_EMAC(dev);
qemu_macaddr_default_if_unset(&s->conf.macaddr);
s->nic = qemu_new_nic(&net_allwinner_sun8i_emac_info, &s->conf,
object_get_typename(OBJECT(dev)), dev->id, s);
qemu_format_nic_info_str(qemu_get_queue(s->nic), s->conf.macaddr.a);
}
static Property allwinner_sun8i_emac_properties[] = {
DEFINE_NIC_PROPERTIES(AwSun8iEmacState, conf),
DEFINE_PROP_UINT8("phy-addr", AwSun8iEmacState, mii_phy_addr, 0),
DEFINE_PROP_END_OF_LIST(),
};
static int allwinner_sun8i_emac_post_load(void *opaque, int version_id)
{
AwSun8iEmacState *s = opaque;
allwinner_sun8i_emac_set_link(qemu_get_queue(s->nic));
return 0;
}
static const VMStateDescription vmstate_aw_emac = {
.name = "allwinner-sun8i-emac",
.version_id = 1,
.minimum_version_id = 1,
.post_load = allwinner_sun8i_emac_post_load,
.fields = (VMStateField[]) {
VMSTATE_UINT8(mii_phy_addr, AwSun8iEmacState),
VMSTATE_UINT32(mii_cmd, AwSun8iEmacState),
VMSTATE_UINT32(mii_data, AwSun8iEmacState),
VMSTATE_UINT32(mii_cr, AwSun8iEmacState),
VMSTATE_UINT32(mii_st, AwSun8iEmacState),
VMSTATE_UINT32(mii_adv, AwSun8iEmacState),
VMSTATE_UINT32(basic_ctl0, AwSun8iEmacState),
VMSTATE_UINT32(basic_ctl1, AwSun8iEmacState),
VMSTATE_UINT32(int_en, AwSun8iEmacState),
VMSTATE_UINT32(int_sta, AwSun8iEmacState),
VMSTATE_UINT32(frm_flt, AwSun8iEmacState),
VMSTATE_UINT32(rx_ctl0, AwSun8iEmacState),
VMSTATE_UINT32(rx_ctl1, AwSun8iEmacState),
VMSTATE_UINT32(rx_desc_head, AwSun8iEmacState),
VMSTATE_UINT32(rx_desc_curr, AwSun8iEmacState),
VMSTATE_UINT32(tx_ctl0, AwSun8iEmacState),
VMSTATE_UINT32(tx_ctl1, AwSun8iEmacState),
VMSTATE_UINT32(tx_desc_head, AwSun8iEmacState),
VMSTATE_UINT32(tx_desc_curr, AwSun8iEmacState),
VMSTATE_UINT32(tx_flowctl, AwSun8iEmacState),
VMSTATE_END_OF_LIST()
}
};
static void allwinner_sun8i_emac_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
dc->realize = allwinner_sun8i_emac_realize;
dc->reset = allwinner_sun8i_emac_reset;
dc->vmsd = &vmstate_aw_emac;
device_class_set_props(dc, allwinner_sun8i_emac_properties);
}
static const TypeInfo allwinner_sun8i_emac_info = {
.name = TYPE_AW_SUN8I_EMAC,
.parent = TYPE_SYS_BUS_DEVICE,
.instance_size = sizeof(AwSun8iEmacState),
.instance_init = allwinner_sun8i_emac_init,
.class_init = allwinner_sun8i_emac_class_init,
};
static void allwinner_sun8i_emac_register_types(void)
{
type_register_static(&allwinner_sun8i_emac_info);
}
type_init(allwinner_sun8i_emac_register_types)
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