Add Xilinx LL Temac driver to u-boot.
Signed-off-by: Michal Simek <mon...@monstr.eu>
---
.../xilinx/microblaze-generic/microblaze-generic.c | 3 +
drivers/net/Makefile | 1 +
drivers/net/xilinx_ll_temac.c | 561 ++++++++++++++++++++
include/netdev.h | 1 +
4 files changed, 566 insertions(+), 0 deletions(-)
create mode 100644 drivers/net/xilinx_ll_temac.c
diff --git a/board/xilinx/microblaze-generic/microblaze-generic.c
b/board/xilinx/microblaze-generic/microblaze-generic.c
index 5a218b7..5bb3fb4 100644
--- a/board/xilinx/microblaze-generic/microblaze-generic.c
+++ b/board/xilinx/microblaze-generic/microblaze-generic.c
@@ -78,4 +78,7 @@ int board_eth_init(bd_t *bis)
#ifdef CONFIG_XILINX_EMACLITE
return xilinx_emaclite_initialize(bis);
#endif
+#ifdef CONFIG_XILINX_LL_TEMAC
+ return xilinx_ll_temac_initialize(bis);
+#endif
}
diff --git a/drivers/net/Makefile b/drivers/net/Makefile
index 218eeff..93f9c28 100644
--- a/drivers/net/Makefile
+++ b/drivers/net/Makefile
@@ -78,6 +78,7 @@ COBJS-$(CONFIG_TSI108_ETH) += tsi108_eth.o
COBJS-$(CONFIG_ULI526X) += uli526x.o
COBJS-$(CONFIG_VSC7385_ENET) += vsc7385.o
COBJS-$(CONFIG_XILINX_EMACLITE) += xilinx_emaclite.o
+COBJS-$(CONFIG_XILINX_LL_TEMAC) += xilinx_ll_temac.o
COBJS := $(COBJS-y)
SRCS := $(COBJS:.o=.c)
diff --git a/drivers/net/xilinx_ll_temac.c b/drivers/net/xilinx_ll_temac.c
new file mode 100644
index 0000000..00a6479
--- /dev/null
+++ b/drivers/net/xilinx_ll_temac.c
@@ -0,0 +1,561 @@
+/*
+ *
+ * Xilinx xps_ll_temac ethernet driver for u-boot
+ *
+ * Author: Yoshio Kashiwagi kashiw...@co-nss.co.jp
+ *
+ * Copyright (C) 2008 Nissin Systems Co.,Ltd.
+ * March 2008 created
+ *
+ * Copyright (C) 2008 - 2009 Michal Simek <mon...@monstr.eu>
+ * June 2008 Microblaze optimalization, FIFO mode support
+ *
+ * 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.
+ *
+ */
+
+#include <config.h>
+#include <common.h>
+#include <net.h>
+#include <malloc.h>
+#include <asm/processor.h>
+#include <asm/io.h>
+
+#ifdef XILINX_LLTEMAC_FIFO_BASEADDR
+# define FIFO_MODE 1
+#elif XILINX_LLTEMAC_SDMA_CTRL_BASEADDR
+# define SDMA_MODE 1
+#else
+# error Xilinx LL Temac: Unsupported mode - Please setup SDMA or FIFO mode
+#endif
+
+#undef ETH_HALTING
+
+#ifdef SDMA_MODE
+/* XPS_LL_TEMAC SDMA registers definition */
+# define TX_NXTDESC_PTR (((struct ll_priv *)(dev->priv))->sdma
+ 0x00)
+# define TX_CURBUF_ADDR (((struct ll_priv *)(dev->priv))->sdma
+ 0x04)
+# define TX_CURBUF_LENGTH (((struct ll_priv *)(dev->priv))->sdma + 0x08)
+# define TX_CURDESC_PTR (((struct ll_priv *)(dev->priv))->sdma
+ 0x0c)
+# define TX_TAILDESC_PTR (((struct ll_priv *)(dev->priv))->sdma + 0x10)
+# define TX_CHNL_CTRL (((struct ll_priv *)(dev->priv))->sdma + 0x14)
+# define TX_IRQ_REG (((struct ll_priv *)(dev->priv))->sdma + 0x18)
+# define TX_CHNL_STS (((struct ll_priv *)(dev->priv))->sdma + 0x1c)
+
+# define RX_NXTDESC_PTR (((struct ll_priv *)(dev->priv))->sdma
+ 0x20)
+# define RX_CURBUF_ADDR (((struct ll_priv *)(dev->priv))->sdma
+ 0x24)
+# define RX_CURBUF_LENGTH (((struct ll_priv *)(dev->priv))->sdma + 0x28)
+# define RX_CURDESC_PTR (((struct ll_priv *)(dev->priv))->sdma
+ 0x2c)
+# define RX_TAILDESC_PTR (((struct ll_priv *)(dev->priv))->sdma + 0x30)
+# define RX_CHNL_CTRL (((struct ll_priv *)(dev->priv))->sdma + 0x34)
+# define RX_IRQ_REG (((struct ll_priv *)(dev->priv))->sdma + 0x38)
+# define RX_CHNL_STS (((struct ll_priv *)(dev->priv))->sdma + 0x3c)
+
+# define DMA_CONTROL_REG (((struct ll_priv *)(dev->priv))->sdma + 0x40)
+#endif
+
+/* XPS_LL_TEMAC direct registers definition */
+#define TEMAC_RAF0 (dev->iobase + 0x00)
+#define TEMAC_TPF0 (dev->iobase + 0x04)
+#define TEMAC_IFGP0 (dev->iobase + 0x08)
+#define TEMAC_IS0 (dev->iobase + 0x0c)
+#define TEMAC_IP0 (dev->iobase + 0x10)
+#define TEMAC_IE0 (dev->iobase + 0x14)
+
+#define TEMAC_MSW0 (dev->iobase + 0x20)
+#define TEMAC_LSW0 (dev->iobase + 0x24)
+#define TEMAC_CTL0 (dev->iobase + 0x28)
+#define TEMAC_RDY0 (dev->iobase + 0x2c)
+
+#define XTE_RSE_MIIM_RR_MASK 0x0002
+#define XTE_RSE_MIIM_WR_MASK 0x0004
+#define XTE_RSE_CFG_RR_MASK 0x0020
+#define XTE_RSE_CFG_WR_MASK 0x0040
+
+/* XPS_LL_TEMAC indirect registers offset definition */
+
+#define RCW0 0x200
+#define RCW1 0x240
+#define TC 0x280
+#define FCC 0x2c0
+#define EMMC 0x300
+#define PHYC 0x320
+#define MC 0x340
+#define UAW0 0x380
+#define UAW1 0x384
+#define MAW0 0x388
+#define MAW1 0x38c
+#define AFM 0x390
+#define TIS 0x3a0
+#define TIE 0x3a4
+#define MIIMWD 0x3b0
+#define MIIMAI 0x3b4
+
+#define CNTLREG_WRITE_ENABLE_MASK 0x8000
+#define CNTLREG_EMAC1SEL_MASK 0x0400
+#define CNTLREG_ADDRESSCODE_MASK 0x03ff
+
+#define MDIO_ENABLE_MASK 0x40
+#define MDIO_CLOCK_DIV_MASK 0x3F
+#define MDIO_CLOCK_DIV_100MHz 0x28
+
+#define ETHER_MTU 1520
+
+#ifdef SDMA_MODE
+/* CDMAC descriptor status bit definitions */
+# define BDSTAT_ERROR_MASK 0x80
+# define BDSTAT_INT_ON_END_MASK 0x40
+# define BDSTAT_STOP_ON_END_MASK 0x20
+# define BDSTAT_COMPLETED_MASK 0x10
+# define BDSTAT_SOP_MASK 0x08
+# define BDSTAT_EOP_MASK 0x04
+# define BDSTAT_CHANBUSY_MASK 0x02
+# define BDSTAT_CHANRESET_MASK 0x01
+
+/* SDMA Buffer Descriptor */
+
+typedef struct cdmac_bd_t {
+ struct cdmac_bd_t *next_p;
+ unsigned char *phys_buf_p;
+ unsigned long buf_len;
+ unsigned char stat;
+ unsigned char app1_1;
+ unsigned short app1_2;
+ unsigned long app2;
+ unsigned long app3;
+ unsigned long app4;
+ unsigned long app5;
+} cdmac_bd __attribute((aligned(32))) ;
+
+static cdmac_bd tx_bd;
+static cdmac_bd rx_bd;
+#endif
+
+#ifdef FIFO_MODE
+typedef struct ll_fifo_s {
+ int isr; /* Interrupt Status Register 0x0 */
+ int ier; /* Interrupt Enable Register 0x4 */
+ int tdfr; /* Transmit data FIFO reset 0x8 */
+ int tdfv; /* Transmit data FIFO Vacancy 0xC */
+ int tdfd; /* Transmit data FIFO 32bit wide data write port 0x10 */
+ int tlf; /* Write Transmit Length FIFO 0x14 */
+ int rdfr; /* Read Receive data FIFO reset 0x18 */
+ int rdfo; /* Receive data FIFO Occupancy 0x1C */
+ int rdfd; /* Read Receive data FIFO 32bit wide data read port 0x20 */
+ int rlf; /* Read Receive Length FIFO 0x24 */
+ int llr; /* Read LocalLink reset 0x28 */
+} ll_fifo_s;
+
+ll_fifo_s *ll_fifo = (ll_fifo_s *) (XILINX_LLTEMAC_FIFO_BASEADDR);
+#endif
+
+#ifdef SDMA_MODE
+static unsigned char tx_buffer[ETHER_MTU] __attribute((aligned(32)));
+#endif
+static unsigned char rx_buffer[ETHER_MTU] __attribute((aligned(32)));
+
+struct ll_priv {
+ unsigned int sdma;
+};
+
+#ifdef DEBUG
+/* undirect hostif write to ll_temac */
+static void xps_ll_temac_hostif_set(struct eth_device *dev, int emac,
+ int phy_addr, int reg_addr, int phy_data)
+{
+ out_be32((u32 *)TEMAC_LSW0, phy_data);
+ out_be32((u32 *)TEMAC_CTL0, CNTLREG_WRITE_ENABLE_MASK | MIIMWD);
+ out_be32((u32 *)TEMAC_LSW0, (phy_addr << 5) | (reg_addr));
+ out_be32((u32 *)TEMAC_CTL0, \
+ CNTLREG_WRITE_ENABLE_MASK | MIIMAI | (emac << 10));
+ while (!(in_be32((u32 *)TEMAC_RDY0) & XTE_RSE_MIIM_WR_MASK))
+ ;
+}
+#endif
+
+/* undirect hostif read from ll_temac */
+static unsigned int xps_ll_temac_hostif_get(struct eth_device *dev,
+ int emac, int phy_addr, int reg_addr)
+{
+ out_be32((u32 *)TEMAC_LSW0, (phy_addr << 5) | (reg_addr));
+ out_be32((u32 *)TEMAC_CTL0, MIIMAI | (emac << 10));
+ while (!(in_be32((u32 *)TEMAC_RDY0) & XTE_RSE_MIIM_RR_MASK))
+ ;
+ return in_be32((u32 *)TEMAC_LSW0);
+}
+
+/* undirect write to ll_temac */
+static void xps_ll_temac_indirect_set(struct eth_device *dev,
+ int emac, int reg_offset, int reg_data)
+{
+ out_be32((u32 *)TEMAC_LSW0, reg_data);
+ out_be32((u32 *)TEMAC_CTL0, \
+ CNTLREG_WRITE_ENABLE_MASK | (emac << 10) | reg_offset);
+ while (!(in_be32((u32 *)TEMAC_RDY0) & XTE_RSE_CFG_WR_MASK))
+ ;
+}
+
+#if DEBUG
+/* undirect read from ll_temac */
+static int xps_ll_temac_indirect_get(struct eth_device *dev,
+ int emac, int reg_offset)
+{
+ out_be32((u32 *)TEMAC_CTL0, (emac << 10) | reg_offset);
+ while (!(in_be32((u32 *)TEMAC_RDY0) & XTE_RSE_CFG_RR_MASK))
+ ;
+ return in_be32((u32 *)TEMAC_LSW0);
+}
+#endif
+
+#ifdef DEBUG
+/* read from phy */
+static void read_phy_reg (struct eth_device *dev, int phy_addr)
+{
+ int j, result;
+ debug ("phy%d ", phy_addr);
+ for (j = 0; j < 32; j++) {
+ result = xps_ll_temac_hostif_get(dev, 0, phy_addr, j);
+ debug ("%d: 0x%x ", j, result);
+ }
+ debug ("\n");
+}
+#endif
+
+static int phy_addr = -1;
+static int link;
+
+/* setting ll_temac and phy to proper setting */
+static int xps_ll_temac_phy_ctrl(struct eth_device *dev)
+{
+ int i;
+ unsigned int result;
+ unsigned retries = 10;
+
+ if (link == 1)
+ return 1; /* link is setup */
+
+ /* wait for link up */
+ while (retries-- &&
+ ((xps_ll_temac_hostif_get(dev, 0, phy_addr, 1) & 0x24) == 0x24))
+ ;
+
+ if (phy_addr == -1) {
+ for (i = 31; i >= 0; i--) {
+ result = xps_ll_temac_hostif_get(dev, 0, i, 1);
+ if ((result & 0x0ffff) != 0x0ffff) {
+ debug ("phy %x result %x\n", i, result);
+ phy_addr = i;
+ break;
+ }
+ }
+ }
+
+ /* get PHY id */
+ i = (xps_ll_temac_hostif_get(dev, 0, phy_addr, 2) << 16) | \
+ xps_ll_temac_hostif_get(dev, 0, phy_addr, 3);
+ debug ("LL_TEMAC: Phy ID 0x%x\n", i);
+
+#ifdef DEBUG
+ xps_ll_temac_hostif_set(dev, 0, 0, 0, 0x8000); /* phy reset */
+#endif
+ /* FIXME this part will be replaced by PHY lib */
+ /* s3e boards */
+ if (i == 0x7c0a3) {
+ /* 100BASE-T/FD */
+ xps_ll_temac_indirect_set(dev, 0, EMMC, 0x40000000);
+ link = 1;
+ return 1;
+ }
+
+ /* Marwell 88e1111 id - ml50x */
+ if (i == 0x1410cc2) {
+ result = xps_ll_temac_hostif_get(dev, 0, phy_addr, 5);
+ if ((result & 0x8000) == 0x8000) {
+ xps_ll_temac_indirect_set(dev, 0, EMMC, 0x80000000);
+ printf("1000BASE-T/FD\n");
+ link = 1;
+ } else if ((result & 0x4000) == 0x4000) {
+ xps_ll_temac_indirect_set(dev, 0, EMMC, 0x40000000);
+ printf("100BASE-T/FD\n");
+ link = 1;
+ } else {
+ printf("Unsupported mode\n");
+ link = 0;
+ return 0;
+ }
+ return 1;
+ }
+ return 0;
+}
+
+#ifdef SDMA_MODE
+/* bd init */
+static void xps_ll_temac_bd_init(struct eth_device *dev)
+{
+ memset((void *)&tx_bd, 0, sizeof(cdmac_bd));
+ memset((void *)&rx_bd, 0, sizeof(cdmac_bd));
+
+ rx_bd.phys_buf_p = &rx_buffer[0];
+
+ rx_bd.next_p = &rx_bd;
+ rx_bd.buf_len = ETHER_MTU;
+ flush_cache((u32)&rx_bd, sizeof(cdmac_bd));
+
+ out_be32((u32 *)RX_CURDESC_PTR, (u32)&rx_bd);
+ out_be32((u32 *)RX_TAILDESC_PTR, (u32)&rx_bd);
+ out_be32((u32 *)RX_NXTDESC_PTR, (u32)&rx_bd); /* setup first fd */
+
+ tx_bd.phys_buf_p = &tx_buffer[0];
+ tx_bd.next_p = &tx_bd;
+
+ flush_cache((u32)&tx_bd, sizeof(cdmac_bd));
+ out_be32((u32 *)TX_CURDESC_PTR, (u32)&tx_bd);
+}
+
+static int xps_ll_temac_send_sdma(struct eth_device *dev,
+ unsigned char *buffer, int length)
+{
+ if (xps_ll_temac_phy_ctrl(dev) == 0)
+ return 0;
+
+ memcpy (tx_buffer, buffer, length);
+ flush_cache ((u32)tx_buffer, length);
+
+ tx_bd.stat = BDSTAT_SOP_MASK | BDSTAT_EOP_MASK | \
+ BDSTAT_STOP_ON_END_MASK;
+ tx_bd.buf_len = length;
+ flush_cache ((u32)&tx_bd, sizeof(cdmac_bd));
+
+ out_be32((u32 *)TX_CURDESC_PTR, (u32)&tx_bd);
+ out_be32((u32 *)TX_TAILDESC_PTR, (u32)&tx_bd); /* DMA start */
+
+ do {
+ flush_cache ((u32)&tx_bd, sizeof(cdmac_bd));
+ } while (!(((volatile int)tx_bd.stat) & BDSTAT_COMPLETED_MASK));
+
+ return length;
+}
+
+static int xps_ll_temac_recv_sdma(struct eth_device *dev)
+{
+ int length;
+
+ flush_cache ((u32)&rx_bd, sizeof(cdmac_bd));
+
+ if (!(rx_bd.stat & BDSTAT_COMPLETED_MASK))
+ return 0;
+
+ length = rx_bd.app5;
+ flush_cache ((u32)rx_bd.phys_buf_p, length);
+
+ rx_bd.buf_len = ETHER_MTU;
+ rx_bd.stat = 0;
+ rx_bd.app5 = 0;
+
+ flush_cache ((u32)&rx_bd, sizeof(cdmac_bd));
+ out_be32((u32 *)RX_TAILDESC_PTR, (u32)&rx_bd);
+
+ if (length > 0)
+ NetReceive(rx_bd.phys_buf_p, length);
+
+ return length;
+}
+#endif
+
+#ifdef FIFO_MODE
+#ifdef DEBUG
+static void debugll(int count)
+{
+ printf ("%d fifo isr 0x%08x, fifo_ier 0x%08x, fifo_rdfr 0x%08x, "
+ "fifo_rdfo 0x%08x fifo_rlr 0x%08x\n", count, ll_fifo->isr, \
+ ll_fifo->ier, ll_fifo->rdfr, ll_fifo->rdfo, ll_fifo->rlf);
+}
+#endif
+
+static int xps_ll_temac_send_fifo(unsigned char *buffer, int length)
+{
+ u32 *buf = (u32 *)buffer;
+ u32 len, i, val;
+
+ len = (length / 4) + 1;
+
+ for (i = 0; i < len; i++) {
+ val = *buf++;
+ ll_fifo->tdfd = val;
+ }
+
+ ll_fifo->tlf = length;
+
+ return length;
+}
+
+static int xps_ll_temac_recv_fifo(void)
+{
+ u32 len, len2, i, val;
+ u32 *buf = (u32 *)&rx_buffer;
+
+ if (ll_fifo->isr & 0x04000000) {
+ ll_fifo->isr = 0xffffffff; /* reset isr */
+
+ /* while (ll_fifo->isr); */
+ len = ll_fifo->rlf & 0x7FF;
+ len2 = (len / 4) + 1;
+
+ for (i = 0; i < len2; i++) {
+ val = ll_fifo->rdfd;
+ *buf++ = val ;
+ }
+
+ /* debugll(1); */
+ NetReceive ((uchar *)&rx_buffer, len);
+ }
+ return 0;
+}
+#endif
+
+/* setup mac addr */
+static int xps_ll_temac_addr_setup(struct eth_device *dev)
+{
+ int val;
+
+ /* set up unicast MAC address filter */
+ val = ((dev->enetaddr[3] << 24) | (dev->enetaddr[2] << 16) |
+ (dev->enetaddr[1] << 8) | (dev->enetaddr[0]));
+ xps_ll_temac_indirect_set(dev, 0, UAW0, val);
+ val = (dev->enetaddr[5] << 8) | dev->enetaddr[4] ;
+ xps_ll_temac_indirect_set(dev, 0, UAW1, val);
+
+ return 0;
+}
+
+static int xps_ll_temac_init(struct eth_device *dev, bd_t *bis)
+{
+#ifdef SDMA_MODE
+ xps_ll_temac_bd_init(dev);
+#endif
+#ifdef FIFO_MODE
+ ll_fifo->tdfr = 0x000000a5; /* set fifo length */
+ ll_fifo->rdfr = 0x000000a5;
+
+ /* ll_fifo->isr = 0x0; */
+ /* ll_fifo->ier = 0x0; */
+#endif
+ xps_ll_temac_indirect_set(dev, 0, MC,
+ MDIO_ENABLE_MASK | MDIO_CLOCK_DIV_100MHz);
+
+ xps_ll_temac_addr_setup(dev);
+ /* Promiscuous mode disable */
+ xps_ll_temac_indirect_set(dev, 0, AFM, 0x00000000);
+ /* Enable Receiver */
+ xps_ll_temac_indirect_set(dev, 0, RCW1, 0x10000000);
+ /* Enable Transmitter */
+ xps_ll_temac_indirect_set(dev, 0, TC, 0x10000000);
+ return 0;
+}
+
+
+static void xps_ll_temac_halt(struct eth_device *dev)
+{
+#ifdef ETH_HALTING
+ /* Disable Receiver */
+ xps_ll_temac_indirect_set(dev, 0, RCW1, 0x00000000);
+ /* Disable Transmitter */
+ xps_ll_temac_indirect_set(dev, 0, TC, 0x00000000);
+
+#ifdef SDMA_MODE
+ out_be32((u32 *)DMA_CONTROL_REG, 0x00000001);
+ while (in_be32((u32 *)DMA_CONTROL_REG) & 1)
+ ;
+#endif
+#ifdef FIFO_MODE
+ /* reset fifos */
+#endif
+#endif
+}
+
+/* halt device */
+static void ll_temac_halt(struct eth_device *dev)
+{
+ link = 0;
+ xps_ll_temac_halt(dev);
+}
+
+static int ll_temac_init(struct eth_device *dev, bd_t *bis)
+{
+ static int first = 1;
+#if DEBUG
+ int i;
+#endif
+ if (!first)
+ return 0;
+ first = 0;
+
+ xps_ll_temac_init(dev, bis);
+
+ printf("%s: Xilinx XPS LocalLink Tri-Mode Ether MAC #%d at 0x%08X.\n",
+ dev->name, 0, dev->iobase);
+
+#if DEBUG
+ for (i = 0; i < 32; i++)
+ read_phy_reg(dev, i);
+#endif
+ xps_ll_temac_phy_ctrl(dev);
+ return 1;
+}
+
+
+static int ll_temac_send(struct eth_device *dev, volatile void *packet,
+ int length)
+{
+#ifdef SDMA_MODE
+ return xps_ll_temac_send_sdma(dev, (unsigned char *)packet, length);
+#endif
+#ifdef FIFO_MODE
+ return xps_ll_temac_send_fifo((unsigned char *)packet, length);
+#endif
+}
+
+static int ll_temac_recv(struct eth_device *dev)
+{
+#ifdef SDMA_MODE
+ return xps_ll_temac_recv_sdma(dev);
+#endif
+#ifdef FIFO_MODE
+ return xps_ll_temac_recv_fifo();
+#endif
+}
+
+int xilinx_ll_temac_initialize (bd_t *bis)
+{
+ struct eth_device *dev;
+
+ dev = calloc(1, sizeof(*dev));
+ if (dev == NULL)
+ hang();
+
+ dev->priv = (struct ll_priv *)
+ calloc(1, sizeof(struct ll_priv));
+
+ if (dev->priv == NULL)
+ hang();
+
+ sprintf(dev->name, "Xilinx LL TEMAC");
+
+ dev->iobase = XILINX_LLTEMAC_BASEADDR;
+#ifdef SDMA_MODE
+ ((struct ll_priv *)(dev->priv))->sdma =
+ XILINX_LLTEMAC_SDMA_CTRL_BASEADDR;
+#endif
+
+ dev->init = ll_temac_init;
+ dev->halt = ll_temac_halt;
+ dev->send = ll_temac_send;
+ dev->recv = ll_temac_recv;
+
+ eth_register(dev);
+
+ return 0;
+}
diff --git a/include/netdev.h b/include/netdev.h
index 979fb57..a486d0b 100644
--- a/include/netdev.h
+++ b/include/netdev.h
@@ -89,6 +89,7 @@ int uec_initialize(int index);
int uec_standard_init(bd_t *bis);
int uli526x_initialize(bd_t *bis);
int xilinx_emaclite_initialize (bd_t *bis);
+int xilinx_ll_temac_initialize(bd_t *bis);
int sh_eth_initialize(bd_t *bis);
int dm9000_initialize(bd_t *bis);
--
1.5.5.6
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