// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2020, Loongson Corporation
*/
#include <linux/clk-provider.h>
#include <linux/pci.h>
#include <linux/dmi.h>
#include <linux/device.h>
#include <linux/of_irq.h>
#include "stmmac.h"
#include "dwmac_dma.h"
#include "dwmac1000.h"
/* Normal Loongson Tx Summary */
#define DMA_INTR_ENA_NIE_TX_LOONGSON 0x00040000
/* Normal Loongson Rx Summary */
#define DMA_INTR_ENA_NIE_RX_LOONGSON 0x00020000
#define DMA_INTR_NORMAL_LOONGSON (DMA_INTR_ENA_NIE_TX_LOONGSON | \
DMA_INTR_ENA_NIE_RX_LOONGSON | \
DMA_INTR_ENA_RIE | DMA_INTR_ENA_TIE)
/* Abnormal Loongson Tx Summary */
#define DMA_INTR_ENA_AIE_TX_LOONGSON 0x00010000
/* Abnormal Loongson Rx Summary */
#define DMA_INTR_ENA_AIE_RX_LOONGSON 0x00008000
#define DMA_INTR_ABNORMAL_LOONGSON (DMA_INTR_ENA_AIE_TX_LOONGSON | \
DMA_INTR_ENA_AIE_RX_LOONGSON | \
DMA_INTR_ENA_FBE | DMA_INTR_ENA_UNE)
#define DMA_INTR_DEFAULT_MASK_LOONGSON (DMA_INTR_NORMAL_LOONGSON | \
DMA_INTR_ABNORMAL_LOONGSON)
/* Normal Loongson Tx Interrupt Summary */
#define DMA_STATUS_NIS_TX_LOONGSON 0x00040000
/* Normal Loongson Rx Interrupt Summary */
#define DMA_STATUS_NIS_RX_LOONGSON 0x00020000
/* Abnormal Loongson Tx Interrupt Summary */
#define DMA_STATUS_AIS_TX_LOONGSON 0x00010000
/* Abnormal Loongson Rx Interrupt Summary */
#define DMA_STATUS_AIS_RX_LOONGSON 0x00008000
/* Fatal Loongson Tx Bus Error Interrupt */
#define DMA_STATUS_FBI_TX_LOONGSON 0x00002000
/* Fatal Loongson Rx Bus Error Interrupt */
#define DMA_STATUS_FBI_RX_LOONGSON 0x00001000
#define DMA_STATUS_MSK_COMMON_LOONGSON (DMA_STATUS_NIS_TX_LOONGSON | \
DMA_STATUS_NIS_RX_LOONGSON | \
DMA_STATUS_AIS_TX_LOONGSON | \
DMA_STATUS_AIS_RX_LOONGSON | \
DMA_STATUS_FBI_TX_LOONGSON | \
DMA_STATUS_FBI_RX_LOONGSON)
#define DMA_STATUS_MSK_RX_LOONGSON (DMA_STATUS_ERI | DMA_STATUS_RWT | \
DMA_STATUS_RPS | DMA_STATUS_RU | \
DMA_STATUS_RI | DMA_STATUS_OVF | \
DMA_STATUS_MSK_COMMON_LOONGSON)
#define DMA_STATUS_MSK_TX_LOONGSON (DMA_STATUS_ETI | DMA_STATUS_UNF | \
DMA_STATUS_TJT | DMA_STATUS_TU | \
DMA_STATUS_TPS | DMA_STATUS_TI | \
DMA_STATUS_MSK_COMMON_LOONGSON)
#define PCI_DEVICE_ID_LOONGSON_GMAC 0x7a03
#define PCI_DEVICE_ID_LOONGSON_GNET 0x7a13
#define DWMAC_CORE_LS_MULTICHAN 0x10 /* Loongson custom ID */
#define CHANNEL_NUM 8
struct loongson_data {
u32 loongson_id;
struct device *dev;
};
struct stmmac_pci_info {
int (*setup)(struct pci_dev *pdev, struct plat_stmmacenet_data *plat);
};
static void loongson_default_data(struct pci_dev *pdev,
struct plat_stmmacenet_data *plat)
{
/* Get bus_id, this can be overwritten later */
plat->bus_id = pci_dev_id(pdev);
plat->clk_csr = 2; /* clk_csr_i = 20-35MHz & MDC = clk_csr_i/16 */
plat->has_gmac = 1;
plat->force_sf_dma_mode = 1;
/* Set default value for multicast hash bins */
plat->multicast_filter_bins = 256;
plat->mac_interface = PHY_INTERFACE_MODE_NA;
/* Set default value for unicast filter entries */
plat->unicast_filter_entries = 1;
/* Set the maxmtu to a default of JUMBO_LEN */
plat->maxmtu = JUMBO_LEN;
/* Disable Priority config by default */
plat->tx_queues_cfg[0].use_prio = false;
plat->rx_queues_cfg[0].use_prio = false;
/* Disable RX queues routing by default */
plat->rx_queues_cfg[0].pkt_route = 0x0;
plat->clk_ref_rate = 125000000;
plat->clk_ptp_rate = 125000000;
/* Default to phy auto-detection */
plat->phy_addr = -1;
plat->dma_cfg->pbl = 32;
plat->dma_cfg->pblx8 = true;
}
static int loongson_gmac_data(struct pci_dev *pdev,
struct plat_stmmacenet_data *plat)
{
struct loongson_data *ld;
int i;
ld = plat->bsp_priv;
loongson_default_data(pdev, plat);
if (ld->loongson_id == DWMAC_CORE_LS_MULTICHAN) {
plat->rx_queues_to_use = CHANNEL_NUM;
plat->tx_queues_to_use = CHANNEL_NUM;
/* Only channel 0 supports checksum,
* so turn off checksum to enable multiple channels.
*/
for (i = 1; i < CHANNEL_NUM; i++)
plat->tx_queues_cfg[i].coe_unsupported = 1;
} else {
plat->tx_queues_to_use = 1;
plat->rx_queues_to_use = 1;
}
plat->phy_interface = PHY_INTERFACE_MODE_RGMII_ID;
return 0;
}
static struct stmmac_pci_info loongson_gmac_pci_info = {
.setup = loongson_gmac_data,
};
static void loongson_gnet_fix_speed(void *priv, unsigned int speed,
unsigned int mode)
{
struct loongson_data *ld = (struct loongson_data *)priv;
struct net_device *ndev = dev_get_drvdata(ld->dev);
struct stmmac_priv *ptr = netdev_priv(ndev);
/* The integrated PHY has a weird problem with switching from the low
* speeds to 1000Mbps mode. The speedup procedure requires the PHY-link
* re-negotiation.
*/
if (speed == SPEED_1000) {
if (readl(ptr->ioaddr + MAC_CTRL_REG) &
GMAC_CONTROL_PS)
/* Word around hardware bug, restart autoneg */
phy_restart_aneg(ndev->phydev);
}
}
static int loongson_gnet_data(struct pci_dev *pdev,
struct plat_stmmacenet_data *plat)
{
struct loongson_data *ld;
int i;
ld = plat->bsp_priv;
loongson_default_data(pdev, plat);
if (ld->loongson_id == DWMAC_CORE_LS_MULTICHAN) {
plat->rx_queues_to_use = CHANNEL_NUM;
plat->tx_queues_to_use = CHANNEL_NUM;
/* Only channel 0 supports checksum,
* so turn off checksum to enable multiple channels.
*/
for (i = 1; i < CHANNEL_NUM; i++)
plat->tx_queues_cfg[i].coe_unsupported = 1;
} else {
plat->tx_queues_to_use = 1;
plat->rx_queues_to_use = 1;
}
plat->phy_interface = PHY_INTERFACE_MODE_GMII;
plat->mdio_bus_data->phy_mask = ~(u32)BIT(2);
plat->fix_mac_speed = loongson_gnet_fix_speed;
return 0;
}
static struct stmmac_pci_info loongson_gnet_pci_info = {
.setup = loongson_gnet_data,
};
static void loongson_dwmac_dma_init_channel(struct stmmac_priv *priv,
void __iomem *ioaddr,
struct stmmac_dma_cfg *dma_cfg,
u32 chan)
{
int txpbl = dma_cfg->txpbl ?: dma_cfg->pbl;
int rxpbl = dma_cfg->rxpbl ?: dma_cfg->pbl;
u32 value;
value = readl(ioaddr + DMA_CHAN_BUS_MODE(chan));
if (dma_cfg->pblx8)
value |= DMA_BUS_MODE_MAXPBL;
value |= DMA_BUS_MODE_USP;
value &= ~(DMA_BUS_MODE_PBL_MASK | DMA_BUS_MODE_RPBL_MASK);
value |= (txpbl << DMA_BUS_MODE_PBL_SHIFT);
value |= (rxpbl << DMA_BUS_MODE_RPBL_SHIFT);
/* Set the Fixed burst mode */
if (dma_cfg->fixed_burst)
value |= DMA_BUS_MODE_FB;
/* Mixed Burst has no effect when fb is set */
if (dma_cfg->mixed_burst)
value |= DMA_BUS_MODE_MB;
if (dma_cfg->atds)
value |= DMA_BUS_MODE_ATDS;
if (dma_cfg->aal)
value |= DMA_BUS_MODE_AAL;
writel(value, ioaddr + DMA_CHAN_BUS_MODE(chan));
/* Mask interrupts by writing to CSR7 */
writel(DMA_INTR_DEFAULT_MASK_LOONGSON, ioaddr +
DMA_CHAN_INTR_ENA(chan));
}
static int loongson_dwmac_dma_interrupt(struct stmmac_priv *priv,
void __iomem *ioaddr,
struct stmmac_extra_stats *x,
u32 chan, u32 dir)
{
struct stmmac_pcpu_stats *stats = this_cpu_ptr(priv->xstats.pcpu_stats);
u32 abnor_intr_status;
u32 nor_intr_status;
u32 fb_intr_status;
u32 intr_status;
int ret = 0;
/* read the status register (CSR5) */
intr_status = readl(ioaddr + DMA_CHAN_STATUS(chan));
if (dir == DMA_DIR_RX)
intr_status &= DMA_STATUS_MSK_RX_LOONGSON;
else if (dir == DMA_DIR_TX)
intr_status &= DMA_STATUS_MSK_TX_LOONGSON;
nor_intr_status = intr_status & (DMA_STATUS_NIS_TX_LOONGSON |
DMA_STATUS_NIS_RX_LOONGSON);
abnor_intr_status = intr_status & (DMA_STATUS_AIS_TX_LOONGSON |
DMA_STATUS_AIS_RX_LOONGSON);
fb_intr_status = intr_status & (DMA_STATUS_FBI_TX_LOONGSON |
DMA_STATUS_FBI_RX_LOONGSON);
/* ABNORMAL interrupts */
if (unlikely(abnor_intr_status)) {
if (unlikely(intr_status & DMA_STATUS_UNF)) {
ret = tx_hard_error_bump_tc;
x->tx_undeflow_irq++;
}
if (unlikely(intr_status & DMA_STATUS_TJT))
x->tx_jabber_irq++;
if (unlikely(intr_status & DMA_STATUS_OVF))
x->rx_overflow_irq++;
if (unlikely(intr_status & DMA_STATUS_RU))
x->rx_buf_unav_irq++;
if (unlikely(intr_status & DMA_STATUS_RPS))
x->rx_process_stopped_irq++;
if (unlikely(intr_status & DMA_STATUS_RWT))
x->rx_watchdog_irq++;
if (unlikely(intr_status & DMA_STATUS_ETI))
x->tx_early_irq++;
if (unlikely(intr_status & DMA_STATUS_TPS)) {
x->tx_process_stopped_irq++;
ret = tx_hard_error;
}
if (unlikely(fb_intr_status)) {
x->fatal_bus_error_irq++;
ret = tx_hard_error;
}
}
/* TX/RX NORMAL interrupts */
if (likely(nor_intr_status)) {
if (likely(intr_status & DMA_STATUS_RI)) {
u32 value = readl(ioaddr + DMA_INTR_ENA);
/* to schedule NAPI on real RIE event. */
if (likely(value & DMA_INTR_ENA_RIE)) {
u64_stats_update_begin(&stats->syncp);
u64_stats_inc(&stats->rx_normal_irq_n[chan]);
u64_stats_update_end(&stats->syncp);
ret |= handle_rx;
}
}
if (likely(intr_status & DMA_STATUS_TI)) {
u64_stats_update_begin(&stats->syncp);
u64_stats_inc(&stats->tx_normal_irq_n[chan]);
u64_stats_update_end(&stats->syncp);
ret |= handle_tx;
}
if (unlikely(intr_status & DMA_STATUS_ERI))
x->rx_early_irq++;
}
/* Optional hardware blocks, interrupts should be disabled */
if (unlikely(intr_status &
(DMA_STATUS_GPI | DMA_STATUS_GMI | DMA_STATUS_GLI)))
pr_warn("%s: unexpected status %08x\n", __func__, intr_status);
/* Clear the interrupt by writing a logic 1 to the CSR5[19-0] */
writel((intr_status & 0x7ffff), ioaddr + DMA_CHAN_STATUS(chan));
return ret;
}
static struct mac_device_info *loongson_dwmac_setup(void *apriv)
{
struct stmmac_priv *priv = apriv;
struct mac_device_info *mac;
struct stmmac_dma_ops *dma;
struct loongson_data *ld;
struct pci_dev *pdev;
ld = priv->plat->bsp_priv;
pdev = to_pci_dev(priv->device);
mac = devm_kzalloc(priv->device, sizeof(*mac), GFP_KERNEL);
if (!mac)
return NULL;
dma = devm_kzalloc(priv->device, sizeof(*dma), GFP_KERNEL);
if (!dma)
return NULL;
/* The Loongson GMAC and GNET devices are based on the DW GMAC
* v3.50a and v3.73a IP-cores. But the HW designers have changed the
* GMAC_VERSION.SNPSVER field to the custom 0x10 value on the
* network controllers with the multi-channels feature
* available to emphasize the differences: multiple DMA-channels,
* AV feature and GMAC_INT_STATUS CSR flags layout. Get back the
* original value so the correct HW-interface would be selected.
*/
if (ld->loongson_id == DWMAC_CORE_LS_MULTICHAN) {
priv->synopsys_id = DWMAC_CORE_3_70;
*dma = dwmac1000_dma_ops;
dma->init_chan = loongson_dwmac_dma_init_channel;
dma->dma_interrupt = loongson_dwmac_dma_interrupt;
mac->dma = dma;
}
priv->dev->priv_flags |= IFF_UNICAST_FLT;
/* Pre-initialize the respective "mac" fields as it's done in
* dwmac1000_setup()
*/
mac->pcsr = priv->ioaddr;
mac->multicast_filter_bins = priv->plat->multicast_filter_bins;
mac->unicast_filter_entries = priv->plat->unicast_filter_entries;
mac->mcast_bits_log2 = 0;
if (mac->multicast_filter_bins)
mac->mcast_bits_log2 = ilog2(mac->multicast_filter_bins);
/* Loongson GMAC doesn't support the flow control. LS2K2000
* GNET doesn't support the half-duplex link mode.
*/
if (pdev->device == PCI_DEVICE_ID_LOONGSON_GMAC) {
mac->link.caps = MAC_10 | MAC_100 | MAC_1000;
} else {
if (ld->loongson_id == DWMAC_CORE_LS_MULTICHAN)
mac->link.caps = MAC_ASYM_PAUSE | MAC_SYM_PAUSE |
MAC_10 | MAC_100 | MAC_1000;
else
mac->link.caps = MAC_ASYM_PAUSE | MAC_SYM_PAUSE |
MAC_10FD | MAC_100FD | MAC_1000FD;
}
mac->link.duplex = GMAC_CONTROL_DM;
mac->link.speed10 = GMAC_CONTROL_PS;
mac->link.speed100 = GMAC_CONTROL_PS | GMAC_CONTROL_FES;
mac->link.speed1000 = 0;
mac->link.speed_mask = GMAC_CONTROL_PS | GMAC_CONTROL_FES;
mac->mii.addr = GMAC_MII_ADDR;
mac->mii.data = GMAC_MII_DATA;
mac->mii.addr_shift = 11;
mac->mii.addr_mask = 0x0000F800;
mac->mii.reg_shift = 6;
mac->mii.reg_mask = 0x000007C0;
mac->mii.clk_csr_shift = 2;
mac->mii.clk_csr_mask = GENMASK(5, 2);
return mac;
}
static int loongson_dwmac_msi_config(struct pci_dev *pdev,
struct plat_stmmacenet_data *plat,
struct stmmac_resources *res)
{
int i, ret, vecs;
vecs = roundup_pow_of_two(CHANNEL_NUM * 2 + 1);
ret = pci_alloc_irq_vectors(pdev, vecs, vecs, PCI_IRQ_MSI);
if (ret < 0) {
dev_warn(&pdev->dev, "Failed to allocate MSI IRQs\n");
return ret;
}
res->irq = pci_irq_vector(pdev, 0);
for (i = 0; i < plat->rx_queues_to_use; i++) {
res->rx_irq[CHANNEL_NUM - 1 - i] =
pci_irq_vector(pdev, 1 + i * 2);
}
for (i = 0; i < plat->tx_queues_to_use; i++) {
res->tx_irq[CHANNEL_NUM - 1 - i] =
pci_irq_vector(pdev, 2 + i * 2);
}
plat->flags |= STMMAC_FLAG_MULTI_MSI_EN;
return 0;
}
static void loongson_dwmac_msi_clear(struct pci_dev *pdev)
{
pci_free_irq_vectors(pdev);
}
static int loongson_dwmac_dt_config(struct pci_dev *pdev,
struct plat_stmmacenet_data *plat,
struct stmmac_resources *res)
{
struct device_node *np = dev_of_node(&pdev->dev);
int ret;
plat->mdio_node = of_get_child_by_name(np, "mdio");
if (plat->mdio_node) {
dev_info(&pdev->dev, "Found MDIO subnode\n");
plat->mdio_bus_data->needs_reset = true;
}
ret = of_alias_get_id(np, "ethernet");
if (ret >= 0)
plat->bus_id = ret;
res->irq = of_irq_get_byname(np, "macirq");
if (res->irq < 0) {
dev_err(&pdev->dev, "IRQ macirq not found\n");
ret = -ENODEV;
goto err_put_node;
}
res->wol_irq = of_irq_get_byname(np, "eth_wake_irq");
if (res->wol_irq < 0) {
dev_info(&pdev->dev,
"IRQ eth_wake_irq not found, using macirq\n");
res->wol_irq = res->irq;
}
res->lpi_irq = of_irq_get_byname(np, "eth_lpi");
if (res->lpi_irq < 0) {
dev_err(&pdev->dev, "IRQ eth_lpi not found\n");
ret = -ENODEV;
goto err_put_node;
}
ret = device_get_phy_mode(&pdev->dev);
if (ret < 0) {
dev_err(&pdev->dev, "phy_mode not found\n");
ret = -ENODEV;
goto err_put_node;
}
plat->phy_interface = ret;
return 0;
err_put_node:
of_node_put(plat->mdio_node);
return ret;
}
static void loongson_dwmac_dt_clear(struct pci_dev *pdev,
struct plat_stmmacenet_data *plat)
{
of_node_put(plat->mdio_node);
}
static int loongson_dwmac_acpi_config(struct pci_dev *pdev,
struct plat_stmmacenet_data *plat,
struct stmmac_resources *res)
{
if (!pdev->irq)
return -EINVAL;
res->irq = pdev->irq;
return 0;
}
static int loongson_dwmac_probe(struct pci_dev *pdev, const struct pci_device_id *id)
{
struct plat_stmmacenet_data *plat;
struct stmmac_pci_info *info;
struct stmmac_resources res;
struct loongson_data *ld;
int ret, i;
plat = devm_kzalloc(&pdev->dev, sizeof(*plat), GFP_KERNEL);
if (!plat)
return -ENOMEM;
plat->mdio_bus_data = devm_kzalloc(&pdev->dev,
sizeof(*plat->mdio_bus_data),
GFP_KERNEL);
if (!plat->mdio_bus_data)
return -ENOMEM;
plat->dma_cfg = devm_kzalloc(&pdev->dev, sizeof(*plat->dma_cfg), GFP_KERNEL);
if (!plat->dma_cfg)
return -ENOMEM;
ld = devm_kzalloc(&pdev->dev, sizeof(*ld), GFP_KERNEL);
if (!ld)
return -ENOMEM;
/* Enable pci device */
ret = pci_enable_device(pdev);
if (ret) {
dev_err(&pdev->dev, "%s: ERROR: failed to enable device\n", __func__);
return ret;
}
pci_set_master(pdev);
/* Get the base address of device */
for (i = 0; i < PCI_STD_NUM_BARS; i++) {
if (pci_resource_len(pdev, i) == 0)
continue;
ret = pcim_iomap_regions(pdev, BIT(0), pci_name(pdev));
if (ret)
goto err_disable_device;
break;
}
memset(&res, 0, sizeof(res));
res.addr = pcim_iomap_table(pdev)[0];
plat->bsp_priv = ld;
plat->setup = loongson_dwmac_setup;
ld->dev = &pdev->dev;
ld->loongson_id = readl(res.addr + GMAC_VERSION) & 0xff;
info = (struct stmmac_pci_info *)id->driver_data;
ret = info->setup(pdev, plat);
if (ret)
goto err_disable_device;
if (dev_of_node(&pdev->dev))
ret = loongson_dwmac_dt_config(pdev, plat, &res);
else
ret = loongson_dwmac_acpi_config(pdev, plat, &res);
if (ret)
goto err_disable_device;
/* Use the common MAC IRQ if per-channel MSIs allocation failed */
if (ld->loongson_id == DWMAC_CORE_LS_MULTICHAN)
loongson_dwmac_msi_config(pdev, plat, &res);
ret = stmmac_dvr_probe(&pdev->dev, plat, &res);
if (ret)
goto err_plat_clear;
return 0;
err_plat_clear:
if (dev_of_node(&pdev->dev))
loongson_dwmac_dt_clear(pdev, plat);
if (ld->loongson_id == DWMAC_CORE_LS_MULTICHAN)
loongson_dwmac_msi_clear(pdev);
err_disable_device:
pci_disable_device(pdev);
return ret;
}
static void loongson_dwmac_remove(struct pci_dev *pdev)
{
struct net_device *ndev = dev_get_drvdata(&pdev->dev);
struct stmmac_priv *priv = netdev_priv(ndev);
struct loongson_data *ld;
int i;
ld = priv->plat->bsp_priv;
stmmac_dvr_remove(&pdev->dev);
if (dev_of_node(&pdev->dev))
loongson_dwmac_dt_clear(pdev, priv->plat);
if (ld->loongson_id == DWMAC_CORE_LS_MULTICHAN)
loongson_dwmac_msi_clear(pdev);
for (i = 0; i < PCI_STD_NUM_BARS; i++) {
if (pci_resource_len(pdev, i) == 0)
continue;
pcim_iounmap_regions(pdev, BIT(i));
break;
}
pci_disable_device(pdev);
}
static int __maybe_unused loongson_dwmac_suspend(struct device *dev)
{
struct pci_dev *pdev = to_pci_dev(dev);
int ret;
ret = stmmac_suspend(dev);
if (ret)
return ret;
ret = pci_save_state(pdev);
if (ret)
return ret;
pci_disable_device(pdev);
pci_wake_from_d3(pdev, true);
return 0;
}
static int __maybe_unused loongson_dwmac_resume(struct device *dev)
{
struct pci_dev *pdev = to_pci_dev(dev);
int ret;
pci_restore_state(pdev);
pci_set_power_state(pdev, PCI_D0);
ret = pci_enable_device(pdev);
if (ret)
return ret;
pci_set_master(pdev);
return stmmac_resume(dev);
}
static SIMPLE_DEV_PM_OPS(loongson_dwmac_pm_ops, loongson_dwmac_suspend,
loongson_dwmac_resume);
static const struct pci_device_id loongson_dwmac_id_table[] = {
{ PCI_DEVICE_DATA(LOONGSON, GMAC, &loongson_gmac_pci_info) },
{ PCI_DEVICE_DATA(LOONGSON, GNET, &loongson_gnet_pci_info) },
{}
};
MODULE_DEVICE_TABLE(pci, loongson_dwmac_id_table);
static struct pci_driver loongson_dwmac_driver = {
.name = "dwmac-loongson-pci",
.id_table = loongson_dwmac_id_table,
.probe = loongson_dwmac_probe,
.remove = loongson_dwmac_remove,
.driver = {
.pm = &loongson_dwmac_pm_ops,
},
};
module_pci_driver(loongson_dwmac_driver);
MODULE_DESCRIPTION("Loongson DWMAC PCI driver");
MODULE_AUTHOR("Qing Zhang <[email protected]>");
MODULE_AUTHOR("Yanteng Si <[email protected]>");
MODULE_LICENSE("GPL v2");
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