net: nuvoton : Add NPCM7xx EMAC driver
NPCM750 provides identical ethernet MAC controllers for WAN/LAN applications.
Signed-off-by: Jim Liu <JJLIU0@nuvoton.com>
Reviewed-by: Ramon Fried <rfried.dev@gmail.com>
diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig
index 0070ff7..52dc9e4 100644
--- a/drivers/net/Kconfig
+++ b/drivers/net/Kconfig
@@ -523,6 +523,11 @@
The MediaTek MT7628 ethernet interface is used on MT7628 and
MT7688 based boards.
+config NET_NPCM750
+ bool "Nuvoton NPCM750 Ethernet MAC"
+ help
+ support NPCM750 EMAC
+
config NET_OCTEON
bool "MIPS Octeon ethernet support"
depends on ARCH_OCTEON
diff --git a/drivers/net/Makefile b/drivers/net/Makefile
index 9536af1..054ec68 100644
--- a/drivers/net/Makefile
+++ b/drivers/net/Makefile
@@ -65,6 +65,7 @@
obj-$(CONFIG_MVNETA) += mvneta.o
obj-$(CONFIG_MVPP2) += mvpp2.o
obj-$(CONFIG_NETCONSOLE) += netconsole.o
+obj-$(CONFIG_NET_NPCM750) += npcm750_eth.o
obj-$(CONFIG_NET_OCTEON) += octeon/
obj-$(CONFIG_NET_OCTEONTX) += octeontx/
obj-$(CONFIG_NET_OCTEONTX2) += octeontx2/
diff --git a/drivers/net/npcm750_eth.c b/drivers/net/npcm750_eth.c
new file mode 100644
index 0000000..409d5cc
--- /dev/null
+++ b/drivers/net/npcm750_eth.c
@@ -0,0 +1,745 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (c) 2021 Nuvoton Technology Corp.
+ */
+
+#include <common.h>
+#include <cpu_func.h>
+#include <dm.h>
+#include <errno.h>
+#include <miiphy.h>
+#include <malloc.h>
+#include <net.h>
+#include <regmap.h>
+#include <serial.h>
+#include <syscon.h>
+#include <asm/io.h>
+#include <linux/err.h>
+#include <linux/iopoll.h>
+
+#define MAC_ADDR_SIZE 6
+#define CONFIG_TX_DESCR_NUM 32
+#define CONFIG_RX_DESCR_NUM 32
+
+#define TX_TOTAL_BUFSIZE \
+ ((CONFIG_TX_DESCR_NUM + 1) * PKTSIZE_ALIGN + PKTALIGN)
+#define RX_TOTAL_BUFSIZE \
+ ((CONFIG_RX_DESCR_NUM + 1) * PKTSIZE_ALIGN + PKTALIGN)
+
+#define CONFIG_MDIO_TIMEOUT (3 * CONFIG_SYS_HZ)
+
+struct npcm750_rxbd {
+ unsigned int sl;
+ unsigned int buffer;
+ unsigned int reserved;
+ unsigned int next;
+} __aligned(ARCH_DMA_MINALIGN);
+
+struct npcm750_txbd {
+ unsigned int mode;
+ unsigned int buffer;
+ unsigned int sl;
+ unsigned int next;
+} __aligned(ARCH_DMA_MINALIGN);
+
+struct emc_regs {
+ u32 camcmr; /* 0x00 */
+ u32 camen; /* 0x04 */
+ u32 cam0m; /* 0x08 */
+ u32 cam0l; /* 0x0c */
+ u32 cam1m; /* 0x10 */
+ u32 cam1l; /* 0x14 */
+ u32 cam2m; /* 0x18 */
+ u32 cam2l; /* 0x1c */
+ u32 cam3m; /* 0x20 */
+ u32 cam3l; /* 0x24 */
+ u32 cam4m; /* 0x28 */
+ u32 cam4l; /* 0x2c */
+ u32 cam5m; /* 0x30 */
+ u32 cam5l; /* 0x34 */
+ u32 cam6m; /* 0x38 */
+ u32 cam6l; /* 0x3c */
+ u32 cam7m; /* 0x40 */
+ u32 cam7l; /* 0x44 */
+ u32 cam8m; /* 0x48 */
+ u32 cam8l; /* 0x4c */
+ u32 cam9m; /* 0x50 */
+ u32 cam9l; /* 0x54 */
+ u32 cam10m; /* 0x58 */
+ u32 cam10l; /* 0x5c */
+ u32 cam11m; /* 0x60 */
+ u32 cam11l; /* 0x64 */
+ u32 cam12m; /* 0x68 */
+ u32 cam12l; /* 0x6c */
+ u32 cam13m; /* 0x70 */
+ u32 cam13l; /* 0x74 */
+ u32 cam14m; /* 0x78 */
+ u32 cam14l; /* 0x7c */
+ u32 cam15m; /* 0x80 */
+ u32 cam15l; /* 0x84 */
+ u32 txdlsa; /* 0x88 */
+ u32 rxdlsa; /* 0x8c */
+ u32 mcmdr; /* 0x90 */
+ u32 miid; /* 0x94 */
+ u32 miida; /* 0x98 */
+ u32 fftcr; /* 0x9c */
+ u32 tsdr; /* 0xa0 */
+ u32 rsdr; /* 0xa4 */
+ u32 dmarfc; /* 0xa8 */
+ u32 mien; /* 0xac */
+ u32 mista; /* 0xb0 */
+ u32 mgsta; /* 0xb4 */
+ u32 mpcnt; /* 0xb8 */
+ u32 mrpc; /* 0xbc */
+ u32 mrpcc; /* 0xc0 */
+ u32 mrepc; /* 0xc4 */
+ u32 dmarfs; /* 0xc8 */
+ u32 ctxdsa; /* 0xcc */
+ u32 ctxbsa; /* 0xd0 */
+ u32 crxdsa; /* 0xd4 */
+ u32 crxbsa; /* 0xd8 */
+};
+
+struct npcm750_eth_dev {
+ struct npcm750_txbd tdesc[CONFIG_TX_DESCR_NUM] __aligned(ARCH_DMA_MINALIGN);
+ struct npcm750_rxbd rdesc[CONFIG_RX_DESCR_NUM] __aligned(ARCH_DMA_MINALIGN);
+ u8 txbuffs[TX_TOTAL_BUFSIZE] __aligned(ARCH_DMA_MINALIGN);
+ u8 rxbuffs[RX_TOTAL_BUFSIZE] __aligned(ARCH_DMA_MINALIGN);
+ struct emc_regs *emc_regs_p;
+ struct phy_device *phydev;
+ struct mii_dev *bus;
+ struct npcm750_txbd *curr_txd;
+ struct npcm750_rxbd *curr_rxd;
+ u32 interface;
+ u32 max_speed;
+ u32 idx;
+ struct regmap *gcr_regmap;
+};
+
+struct npcm750_eth_pdata {
+ struct eth_pdata eth_pdata;
+};
+
+/* mac controller bit */
+#define MCMDR_RXON BIT(0)
+#define MCMDR_ACP BIT(3)
+#define MCMDR_SPCRC BIT(5)
+#define MCMDR_TXON BIT(8)
+#define MCMDR_NDEF BIT(9)
+#define MCMDR_FDUP BIT(18)
+#define MCMDR_ENMDC BIT(19)
+#define MCMDR_OPMOD BIT(20)
+#define MCMDR_SWR BIT(24)
+
+/* cam command regiser */
+#define CAMCMR_AUP 0x01
+#define CAMCMR_AMP BIT(1)
+#define CAMCMR_ABP BIT(2)
+#define CAMCMR_CCAM BIT(3)
+#define CAMCMR_ECMP BIT(4)
+#define CAM0EN 0x01
+
+/* mac mii controller bit */
+#define MDCON BIT(19)
+#define PHYAD BIT(8)
+#define PHYWR BIT(16)
+#define PHYBUSY BIT(17)
+#define PHYPRESP BIT(18)
+#define CAM_ENTRY_SIZE 0x08
+
+/* rx and tx status */
+#define TXDS_TXCP BIT(19)
+#define RXDS_CRCE BIT(17)
+#define RXDS_PTLE BIT(19)
+#define RXDS_RXGD BIT(20)
+#define RXDS_ALIE BIT(21)
+#define RXDS_RP BIT(22)
+
+/* mac interrupt status*/
+#define MISTA_RXINTR BIT(0)
+#define MISTA_CRCE BIT(1)
+#define MISTA_RXOV BIT(2)
+#define MISTA_PTLE BIT(3)
+#define MISTA_RXGD BIT(4)
+#define MISTA_ALIE BIT(5)
+#define MISTA_RP BIT(6)
+#define MISTA_MMP BIT(7)
+#define MISTA_DFOI BIT(8)
+#define MISTA_DENI BIT(9)
+#define MISTA_RDU BIT(10)
+#define MISTA_RXBERR BIT(11)
+#define MISTA_CFR BIT(14)
+#define MISTA_TXINTR BIT(16)
+#define MISTA_TXEMP BIT(17)
+#define MISTA_TXCP BIT(18)
+#define MISTA_EXDEF BIT(19)
+#define MISTA_NCS BIT(20)
+#define MISTA_TXABT BIT(21)
+#define MISTA_LC BIT(22)
+#define MISTA_TDU BIT(23)
+#define MISTA_TXBERR BIT(24)
+
+#define ENSTART 0x01
+#define ENRXINTR BIT(0)
+#define ENCRCE BIT(1)
+#define EMRXOV BIT(2)
+#define ENPTLE BIT(3)
+#define ENRXGD BIT(4)
+#define ENALIE BIT(5)
+#define ENRP BIT(6)
+#define ENMMP BIT(7)
+#define ENDFO BIT(8)
+#define ENDENI BIT(9)
+#define ENRDU BIT(10)
+#define ENRXBERR BIT(11)
+#define ENCFR BIT(14)
+#define ENTXINTR BIT(16)
+#define ENTXEMP BIT(17)
+#define ENTXCP BIT(18)
+#define ENTXDEF BIT(19)
+#define ENNCS BIT(20)
+#define ENTXABT BIT(21)
+#define ENLC BIT(22)
+#define ENTDU BIT(23)
+#define ENTXBERR BIT(24)
+
+#define RX_STAT_RBC 0xffff
+#define RX_STAT_RXINTR BIT(16)
+#define RX_STAT_CRCE BIT(17)
+#define RX_STAT_PTLE BIT(19)
+#define RX_STAT_RXGD BIT(20)
+#define RX_STAT_ALIE BIT(21)
+#define RX_STAT_RP BIT(22)
+#define RX_STAT_OWNER (BIT(30) | BIT(31))
+
+#define TX_STAT_TBC 0xffff
+#define TX_STAT_TXINTR BIT(16)
+#define TX_STAT_DEF BIT(17)
+#define TX_STAT_TXCP BIT(19)
+#define TX_STAT_EXDEF BIT(20)
+#define TX_STAT_NCS BIT(21)
+#define TX_STAT_TXBT BIT(22)
+#define TX_STAT_LC BIT(23)
+#define TX_STAT_TXHA BIT(24)
+#define TX_STAT_PAU BIT(25)
+#define TX_STAT_SQE BIT(26)
+
+/* rx and tx owner bit */
+#define RX_OWEN_DMA BIT(31)
+#define RX_OWEN_CPU 0x00 //bit 30 & bit 31
+#define TX_OWEN_DMA BIT(31)
+#define TX_OWEN_CPU (~(BIT(31)))
+
+/* tx frame desc controller bit */
+#define MACTXINTEN 0x04
+#define CRCMODE 0x02
+#define PADDINGMODE 0x01
+
+/* fftcr controller bit */
+#define RXTHD 0x03
+#define TXTHD (BIT(8) | BIT(9))
+#define BLENGTH BIT(21)
+
+/* global setting for driver */
+#define RX_DESC_SIZE 128
+#define TX_DESC_SIZE 64
+#define MAX_RBUFF_SZ 0x600
+#define MAX_TBUFF_SZ 0x600
+#define TX_TIMEOUT 50
+#define DELAY 1000
+#define CAM0 0x0
+#define RX_POLL_SIZE (RX_DESC_SIZE / 2)
+#define MII_TIMEOUT 100
+#define GCR_INTCR 0x3c
+#define INTCR_R1EN BIT(5)
+
+enum MIIDA_MDCCR_T {
+ MIIDA_MDCCR_4 = 0x00,
+ MIIDA_MDCCR_6 = 0x01,
+ MIIDA_MDCCR_8 = 0x02,
+ MIIDA_MDCCR_12 = 0x03,
+ MIIDA_MDCCR_16 = 0x04,
+ MIIDA_MDCCR_20 = 0x05,
+ MIIDA_MDCCR_24 = 0x06,
+ MIIDA_MDCCR_28 = 0x07,
+ MIIDA_MDCCR_30 = 0x08,
+ MIIDA_MDCCR_32 = 0x09,
+ MIIDA_MDCCR_36 = 0x0A,
+ MIIDA_MDCCR_40 = 0x0B,
+ MIIDA_MDCCR_44 = 0x0C,
+ MIIDA_MDCCR_48 = 0x0D,
+ MIIDA_MDCCR_54 = 0x0E,
+ MIIDA_MDCCR_60 = 0x0F,
+};
+
+DECLARE_GLOBAL_DATA_PTR;
+
+static int npcm750_mdio_read(struct mii_dev *bus, int addr, int devad, int regs)
+{
+ struct npcm750_eth_dev *priv = (struct npcm750_eth_dev *)bus->priv;
+ struct emc_regs *reg = priv->emc_regs_p;
+ u32 start, val;
+ int timeout = CONFIG_MDIO_TIMEOUT;
+
+ val = (addr << 0x08) | regs | PHYBUSY | (MIIDA_MDCCR_60 << 20);
+ writel(val, ®->miida);
+
+ start = get_timer(0);
+ while (get_timer(start) < timeout) {
+ if (!(readl(®->miida) & PHYBUSY)) {
+ val = readl(®->miid);
+ return val;
+ }
+ udelay(10);
+ };
+ return -ETIMEDOUT;
+}
+
+static int npcm750_mdio_write(struct mii_dev *bus, int addr, int devad, int regs,
+ u16 val)
+{
+ struct npcm750_eth_dev *priv = (struct npcm750_eth_dev *)bus->priv;
+ struct emc_regs *reg = priv->emc_regs_p;
+ ulong start;
+ int ret = -ETIMEDOUT, timeout = CONFIG_MDIO_TIMEOUT;
+
+ writel(val, ®->miid);
+ writel((addr << 0x08) | regs | PHYBUSY | PHYWR | (MIIDA_MDCCR_60 << 20), ®->miida);
+
+ start = get_timer(0);
+ while (get_timer(start) < timeout) {
+ if (!(readl(®->miida) & PHYBUSY)) {
+ ret = 0;
+ break;
+ }
+ udelay(10);
+ };
+ return ret;
+}
+
+static int npcm750_mdio_reset(struct mii_dev *bus)
+{
+ return 0;
+}
+
+static int npcm750_mdio_init(const char *name, struct npcm750_eth_dev *priv)
+{
+ struct emc_regs *reg = priv->emc_regs_p;
+ struct mii_dev *bus = mdio_alloc();
+
+ if (!bus) {
+ printf("Failed to allocate MDIO bus\n");
+ return -ENOMEM;
+ }
+
+ bus->read = npcm750_mdio_read;
+ bus->write = npcm750_mdio_write;
+ snprintf(bus->name, sizeof(bus->name), "%s", name);
+ bus->reset = npcm750_mdio_reset;
+
+ bus->priv = (void *)priv;
+
+ writel(readl(®->mcmdr) | MCMDR_ENMDC, ®->mcmdr);
+ return mdio_register(bus);
+}
+
+static void npcm750_tx_descs_init(struct npcm750_eth_dev *priv)
+{
+ struct emc_regs *reg = priv->emc_regs_p;
+ struct npcm750_txbd *desc_table_p = &priv->tdesc[0];
+ struct npcm750_txbd *desc_p;
+ u8 *txbuffs = &priv->txbuffs[0];
+ u32 idx;
+
+ writel((u32)desc_table_p, ®->txdlsa);
+ priv->curr_txd = desc_table_p;
+
+ for (idx = 0; idx < CONFIG_TX_DESCR_NUM; idx++) {
+ desc_p = &desc_table_p[idx];
+ desc_p->buffer = (u32)&txbuffs[idx * PKTSIZE_ALIGN];
+ desc_p->sl = 0;
+ desc_p->mode = 0;
+ desc_p->mode = TX_OWEN_CPU | PADDINGMODE | CRCMODE | MACTXINTEN;
+ if (idx < (CONFIG_TX_DESCR_NUM - 1))
+ desc_p->next = (u32)&desc_table_p[idx + 1];
+ else
+ desc_p->next = (u32)&priv->tdesc[0];
+ }
+ flush_dcache_range((ulong)&desc_table_p[0],
+ (ulong)&desc_table_p[CONFIG_TX_DESCR_NUM]);
+}
+
+static void npcm750_rx_descs_init(struct npcm750_eth_dev *priv)
+{
+ struct emc_regs *reg = priv->emc_regs_p;
+ struct npcm750_rxbd *desc_table_p = &priv->rdesc[0];
+ struct npcm750_rxbd *desc_p;
+ u8 *rxbuffs = &priv->rxbuffs[0];
+ u32 idx;
+
+ flush_dcache_range((ulong)priv->rxbuffs[0],
+ (ulong)priv->rxbuffs[CONFIG_RX_DESCR_NUM]);
+
+ writel((u32)desc_table_p, ®->rxdlsa);
+ priv->curr_rxd = desc_table_p;
+
+ for (idx = 0; idx < CONFIG_RX_DESCR_NUM; idx++) {
+ desc_p = &desc_table_p[idx];
+ desc_p->sl = RX_OWEN_DMA;
+ desc_p->buffer = (u32)&rxbuffs[idx * PKTSIZE_ALIGN];
+ if (idx < (CONFIG_RX_DESCR_NUM - 1))
+ desc_p->next = (u32)&desc_table_p[idx + 1];
+ else
+ desc_p->next = (u32)&priv->rdesc[0];
+ }
+ flush_dcache_range((ulong)&desc_table_p[0],
+ (ulong)&desc_table_p[CONFIG_RX_DESCR_NUM]);
+}
+
+static void npcm750_set_fifo_threshold(struct npcm750_eth_dev *priv)
+{
+ struct emc_regs *reg = priv->emc_regs_p;
+ unsigned int val;
+
+ val = RXTHD | TXTHD | BLENGTH;
+ writel(val, ®->fftcr);
+}
+
+static void npcm750_set_global_maccmd(struct npcm750_eth_dev *priv)
+{
+ struct emc_regs *reg = priv->emc_regs_p;
+ unsigned int val;
+
+ val = readl(®->mcmdr);
+ val |= MCMDR_SPCRC | MCMDR_ENMDC | MCMDR_ACP | MCMDR_NDEF;
+ writel(val, ®->mcmdr);
+}
+
+static void npcm750_set_cam(struct npcm750_eth_dev *priv,
+ unsigned int x, unsigned char *pval)
+{
+ struct emc_regs *reg = priv->emc_regs_p;
+ unsigned int msw, lsw;
+
+ msw = (pval[0] << 24) | (pval[1] << 16) | (pval[2] << 8) | pval[3];
+ lsw = (pval[4] << 24) | (pval[5] << 16);
+
+ writel(lsw, ®->cam0l + x * CAM_ENTRY_SIZE);
+ writel(msw, ®->cam0m + x * CAM_ENTRY_SIZE);
+ writel(readl(®->camen) | CAM0EN, ®->camen);
+ writel(CAMCMR_ECMP | CAMCMR_ABP | CAMCMR_AUP, ®->camcmr);
+}
+
+static void npcm750_adjust_link(struct emc_regs *reg,
+ struct phy_device *phydev)
+{
+ u32 val = readl(®->mcmdr);
+
+ if (!phydev->link) {
+ printf("%s: No link.\n", phydev->dev->name);
+ return;
+ }
+
+ if (phydev->speed == 100)
+ val |= MCMDR_OPMOD;
+ else
+ val &= ~MCMDR_OPMOD;
+
+ if (phydev->duplex)
+ val |= MCMDR_FDUP;
+ else
+ val &= ~MCMDR_FDUP;
+
+ writel(val, ®->mcmdr);
+
+ debug("Speed: %d, %s duplex%s\n", phydev->speed,
+ (phydev->duplex) ? "full" : "half",
+ (phydev->port == PORT_FIBRE) ? ", fiber mode" : "");
+}
+
+static int npcm750_phy_init(struct npcm750_eth_dev *priv, void *dev)
+{
+ struct phy_device *phydev;
+ int ret;
+ u32 address = 0x0;
+
+ phydev = phy_connect(priv->bus, address, dev, priv->interface);
+ if (!phydev)
+ return -ENODEV;
+
+ if (priv->max_speed) {
+ ret = phy_set_supported(phydev, priv->max_speed);
+ if (ret)
+ return ret;
+ }
+ phydev->advertising = phydev->supported;
+
+ priv->phydev = phydev;
+ phy_config(phydev);
+ return 0;
+}
+
+static int npcm750_eth_start(struct udevice *dev)
+{
+ struct eth_pdata *pdata = dev_get_plat(dev);
+ struct npcm750_eth_dev *priv = dev_get_priv(dev);
+ struct emc_regs *reg = priv->emc_regs_p;
+ u8 *enetaddr = pdata->enetaddr;
+ int ret;
+
+ writel(readl(®->mcmdr) & ~MCMDR_TXON & ~MCMDR_RXON, ®->mcmdr);
+
+ writel(readl(®->mcmdr) | MCMDR_SWR, ®->mcmdr);
+ do {
+ ret = readl(®->mcmdr);
+ } while (ret & MCMDR_SWR);
+
+ npcm750_rx_descs_init(priv);
+ npcm750_tx_descs_init(priv);
+
+ npcm750_set_cam(priv, priv->idx, enetaddr);
+ npcm750_set_global_maccmd(priv);
+ npcm750_set_fifo_threshold(priv);
+
+ /* Start up the PHY */
+ ret = phy_startup(priv->phydev);
+ if (ret) {
+ printf("Could not initialize PHY\n");
+ return ret;
+ }
+
+ npcm750_adjust_link(reg, priv->phydev);
+ writel(readl(®->mcmdr) | MCMDR_TXON | MCMDR_RXON, ®->mcmdr);
+
+ return 0;
+}
+
+static int npcm750_eth_send(struct udevice *dev, void *packet, int length)
+{
+ struct npcm750_eth_dev *priv = dev_get_priv(dev);
+ struct emc_regs *reg = priv->emc_regs_p;
+ struct npcm750_txbd *desc_p;
+ struct npcm750_txbd *next_desc_p;
+
+ desc_p = priv->curr_txd;
+
+ invalidate_dcache_range((ulong)desc_p, (ulong)(desc_p + 1));
+ /* Check if the descriptor is owned by CPU */
+ if (desc_p->mode & TX_OWEN_DMA) {
+ next_desc_p = (struct npcm750_txbd *)desc_p->next;
+
+ while ((next_desc_p != desc_p) && (next_desc_p->mode & TX_OWEN_DMA))
+ next_desc_p = (struct npcm750_txbd *)next_desc_p->next;
+
+ if (next_desc_p == desc_p) {
+ struct emc_regs *reg = priv->emc_regs_p;
+
+ writel(0, ®->tsdr);
+ serial_printf("TX: overflow and exit\n");
+ return -EPERM;
+ }
+
+ desc_p = next_desc_p;
+ }
+
+ memcpy((void *)desc_p->buffer, packet, length);
+ flush_dcache_range((ulong)desc_p->buffer,
+ (ulong)desc_p->buffer + roundup(length, ARCH_DMA_MINALIGN));
+ desc_p->sl = 0;
+ desc_p->sl = length & TX_STAT_TBC;
+ desc_p->mode = TX_OWEN_DMA | PADDINGMODE | CRCMODE;
+ flush_dcache_range((ulong)desc_p, (ulong)(desc_p + 1));
+
+ if (!(readl(®->mcmdr) & MCMDR_TXON))
+ writel(readl(®->mcmdr) | MCMDR_TXON, ®->mcmdr);
+ priv->curr_txd = (struct npcm750_txbd *)priv->curr_txd->next;
+
+ writel(0, ®->tsdr);
+ return 0;
+}
+
+static int npcm750_eth_recv(struct udevice *dev, int flags, uchar **packetp)
+{
+ struct npcm750_eth_dev *priv = dev_get_priv(dev);
+ struct npcm750_rxbd *desc_p;
+ struct npcm750_rxbd *next_desc_p;
+ int length = -1;
+
+ desc_p = priv->curr_rxd;
+ invalidate_dcache_range((ulong)desc_p, (ulong)(desc_p + 1));
+
+ if ((desc_p->sl & RX_STAT_OWNER) == RX_OWEN_DMA) {
+ next_desc_p = (struct npcm750_rxbd *)desc_p->next;
+ while ((next_desc_p != desc_p) &&
+ ((next_desc_p->sl & RX_STAT_OWNER) == RX_OWEN_CPU)) {
+ next_desc_p = (struct npcm750_rxbd *)next_desc_p->next;
+ }
+
+ if (next_desc_p == desc_p) {
+ struct emc_regs *reg = priv->emc_regs_p;
+
+ writel(0, ®->rsdr);
+ serial_printf("RX: overflow and exit\n");
+ return -EPERM;
+ }
+ desc_p = next_desc_p;
+ }
+
+ /* Check if the descriptor is owned by CPU */
+ if ((desc_p->sl & RX_STAT_OWNER) == RX_OWEN_CPU) {
+ if (desc_p->sl & RX_STAT_RXGD) {
+ length = desc_p->sl & RX_STAT_RBC;
+ invalidate_dcache_range((ulong)desc_p->buffer,
+ (ulong)(desc_p->buffer + roundup(length,
+ ARCH_DMA_MINALIGN)));
+ *packetp = (u8 *)(u32)desc_p->buffer;
+ priv->curr_rxd = desc_p;
+ }
+ }
+ return length;
+}
+
+static int npcm750_eth_free_pkt(struct udevice *dev, uchar *packet, int length)
+{
+ struct npcm750_eth_dev *priv = dev_get_priv(dev);
+ struct emc_regs *reg = priv->emc_regs_p;
+ struct npcm750_rxbd *desc_p = priv->curr_rxd;
+
+ /*
+ * Make the current descriptor valid again and go to
+ * the next one
+ */
+ desc_p->sl |= RX_OWEN_DMA;
+ flush_dcache_range((ulong)desc_p, (ulong)(desc_p + 1));
+ priv->curr_rxd = (struct npcm750_rxbd *)priv->curr_rxd->next;
+ writel(0, ®->rsdr);
+
+ return 0;
+}
+
+static void npcm750_eth_stop(struct udevice *dev)
+{
+ struct npcm750_eth_dev *priv = dev_get_priv(dev);
+ struct emc_regs *reg = priv->emc_regs_p;
+
+ writel(readl(®->mcmdr) & ~MCMDR_TXON, ®->mcmdr);
+ writel(readl(®->mcmdr) & ~MCMDR_RXON, ®->mcmdr);
+ priv->curr_txd = (struct npcm750_txbd *)readl(®->txdlsa);
+ priv->curr_rxd = (struct npcm750_rxbd *)readl(®->rxdlsa);
+ phy_shutdown(priv->phydev);
+}
+
+static int npcm750_eth_write_hwaddr(struct udevice *dev)
+{
+ struct eth_pdata *pdata = dev_get_plat(dev);
+ struct npcm750_eth_dev *priv = dev_get_priv(dev);
+
+ npcm750_set_cam(priv, CAM0, pdata->enetaddr);
+ return 0;
+}
+
+static int npcm750_eth_bind(struct udevice *dev)
+{
+ return 0;
+}
+
+static int npcm750_eth_probe(struct udevice *dev)
+{
+ struct eth_pdata *pdata = dev_get_plat(dev);
+ struct npcm750_eth_dev *priv = dev_get_priv(dev);
+ u32 iobase = pdata->iobase;
+ int ret;
+
+ memset(priv, 0, sizeof(struct npcm750_eth_dev));
+ ret = dev_read_u32(dev, "id", &priv->idx);
+ if (ret) {
+ printf("failed to get id\n");
+ return -EINVAL;
+ }
+
+ priv->gcr_regmap = syscon_regmap_lookup_by_phandle(dev, "syscon-gcr");
+ if (IS_ERR(priv->gcr_regmap))
+ return -EINVAL;
+
+ priv->emc_regs_p = (struct emc_regs *)iobase;
+ priv->interface = pdata->phy_interface;
+ priv->max_speed = pdata->max_speed;
+
+ if (priv->idx == 0) {
+ /* Enable RMII for EMC1 module */
+ regmap_update_bits(priv->gcr_regmap, GCR_INTCR, INTCR_R1EN, INTCR_R1EN);
+ }
+
+ npcm750_mdio_init(dev->name, priv);
+ priv->bus = miiphy_get_dev_by_name(dev->name);
+
+ ret = npcm750_phy_init(priv, dev);
+
+ return ret;
+}
+
+static int npcm750_eth_remove(struct udevice *dev)
+{
+ struct npcm750_eth_dev *priv = dev_get_priv(dev);
+
+ free(priv->phydev);
+ mdio_unregister(priv->bus);
+ mdio_free(priv->bus);
+
+ return 0;
+}
+
+static const struct eth_ops npcm750_eth_ops = {
+ .start = npcm750_eth_start,
+ .send = npcm750_eth_send,
+ .recv = npcm750_eth_recv,
+ .free_pkt = npcm750_eth_free_pkt,
+ .stop = npcm750_eth_stop,
+ .write_hwaddr = npcm750_eth_write_hwaddr,
+};
+
+static int npcm750_eth_ofdata_to_platdata(struct udevice *dev)
+{
+ struct npcm750_eth_pdata *npcm750_pdata = dev_get_plat(dev);
+ struct eth_pdata *pdata = &npcm750_pdata->eth_pdata;
+ const char *phy_mode;
+ const fdt32_t *cell;
+ int ret = 0;
+
+ pdata->iobase = (phys_addr_t)dev_read_addr_ptr(dev);
+
+ pdata->phy_interface = -1;
+ phy_mode = fdt_getprop(gd->fdt_blob, dev_of_offset(dev), "phy-mode", NULL);
+ if (phy_mode)
+ pdata->phy_interface = phy_get_interface_by_name(phy_mode);
+ if (pdata->phy_interface == -1) {
+ printf("%s: Invalid PHY interface '%s'\n", __func__, phy_mode);
+ return -EINVAL;
+ }
+
+ pdata->max_speed = 0;
+ cell = fdt_getprop(gd->fdt_blob, dev_of_offset(dev), "max-speed", NULL);
+ if (cell)
+ pdata->max_speed = fdt32_to_cpu(*cell);
+
+ return ret;
+}
+
+static const struct udevice_id npcm750_eth_ids[] = {
+ { .compatible = "nuvoton,npcm750-emc" },
+ { }
+};
+
+U_BOOT_DRIVER(eth_npcm750) = {
+ .name = "eth_npcm750",
+ .id = UCLASS_ETH,
+ .of_match = npcm750_eth_ids,
+ .of_to_plat = npcm750_eth_ofdata_to_platdata,
+ .bind = npcm750_eth_bind,
+ .probe = npcm750_eth_probe,
+ .remove = npcm750_eth_remove,
+ .ops = &npcm750_eth_ops,
+ .priv_auto = sizeof(struct npcm750_eth_dev),
+ .plat_auto = sizeof(struct npcm750_eth_pdata),
+ .flags = DM_FLAG_ALLOC_PRIV_DMA,
+};