This driver implements MAC and MII layer of PIC32 ethernet controller. This controller is capable of handling 100/10mbps full/half duplex ethernet communication. Network data transfer is handled by internal DMA engine.

Signed-off-by: Purna Chandra Mandal purna.mandal@microchip.com ---

drivers/net/Kconfig | 7 + drivers/net/Makefile | 1 + drivers/net/pic32_eth.c | 648 +++++++++++++++++++++++++++++++++++++++++++++++ drivers/net/pic32_eth.h | 184 ++++++++++++++ drivers/net/pic32_mdio.c | 143 +++++++++++ 5 files changed, 983 insertions(+) create mode 100644 drivers/net/pic32_eth.c create mode 100644 drivers/net/pic32_eth.h create mode 100644 drivers/net/pic32_mdio.c

diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig index 6905cc0..2d7bf7c 100644 --- a/drivers/net/Kconfig +++ b/drivers/net/Kconfig @@ -107,4 +107,11 @@ config ZYNQ_GEM help This MAC is presetn in Xilinx Zynq and ZynqMP SoCs.

+config PIC32_ETH + bool "Microchip PIC32 Ethernet Support" + depends on MACH_PIC32 + help + This driver implements 10/100 Mbps Ethernet and MAC layer for + Microchip PIC32 microcontrollers. + endif # NETDEVICES diff --git a/drivers/net/Makefile b/drivers/net/Makefile index 150470c..33a81ee 100644 --- a/drivers/net/Makefile +++ b/drivers/net/Makefile @@ -72,3 +72,4 @@ obj-$(CONFIG_FSL_MC_ENET) += fsl-mc/ obj-$(CONFIG_FSL_MC_ENET) += ldpaa_eth/ obj-$(CONFIG_FSL_MEMAC) += fm/memac_phy.o obj-$(CONFIG_VSC9953) += vsc9953.o +obj-$(CONFIG_PIC32_ETH) += pic32_mdio.o pic32_eth.o diff --git a/drivers/net/pic32_eth.c b/drivers/net/pic32_eth.c new file mode 100644 index 0000000..ba499fb --- /dev/null +++ b/drivers/net/pic32_eth.c @@ -0,0 +1,648 @@ +/* + * (c) 2015 Purna Chandra Mandal purna.mandal@microchip.com + * + * SPDX-License-Identifier: GPL-2.0+ + * + */ +#include <common.h> +#include <malloc.h> +#include <errno.h> +#include <miiphy.h> +#include <phy.h> +#include <asm/io.h> +#include <console.h> +#include <dm.h> +#include <net.h> +#include <asm/gpio.h> + +#include "pic32_eth.h" + +/* local definitions */ +#define MAX_RX_BUF_SIZE 1536 +#define MAX_RX_DESCR PKTBUFSRX +#define MAX_TX_DESCR 2 + +DECLARE_GLOBAL_DATA_PTR; + +struct pic32eth_device { + struct eth_dma_desc rxd_ring[MAX_RX_DESCR]; + struct eth_dma_desc txd_ring[MAX_TX_DESCR]; + struct pic32_ectl_regs *ectl_regs; + struct pic32_emac_regs *emac_regs; + struct phy_device *phydev; + phy_interface_t phyif; + u32 phy_id; /* PHY addr */ + u32 rxd_idx; /* index of RX desc to read */ + struct gpio_desc rst_gpio; +}; + +__attribute__ ((weak)) void board_netphy_reset(void *dev) +{ + struct pic32eth_device *pedev = (struct pic32eth_device *)dev; + + if (!dm_gpio_is_valid(&pedev->rst_gpio)) + return; + + /* phy reset */ + dm_gpio_set_value(&pedev->rst_gpio, 0); + udelay(300); + dm_gpio_set_value(&pedev->rst_gpio, 1); + udelay(300); +} + +/* Initialize mii(MDIO) interface, discover which PHY is + * attached to the device, and configure it properly. + */ +static int _mdio_init(struct pic32eth_device *pedev) +{ + struct pic32_ectl_regs *ectl_p = pedev->ectl_regs; + struct pic32_emac_regs *emac_p = pedev->emac_regs; + + board_netphy_reset(pedev); + + /* disable RX, TX & all transactions */ + writel(ETHCON_ON | ETHCON_TXRTS | ETHCON_RXEN, &ectl_p->con1.clr); + + /* wait until not BUSY */ + while (readl(&ectl_p->stat.raw) & ETHSTAT_BUSY) + ; + + /* turn controller ON to access PHY over MII */ + writel(ETHCON_ON, &ectl_p->con1.set); + + udelay(DELAY_10MSEC); + + /* reset MAC */ + writel(EMAC_SOFTRESET, &emac_p->cfg1.set); /* reset assert */ + udelay(DELAY_10MSEC); + writel(EMAC_SOFTRESET, &emac_p->cfg1.clr); /* reset deassert */ + + /* initialize MDIO/MII */ + if (pedev->phyif == PHY_INTERFACE_MODE_RMII) { + writel(EMAC_RMII_RESET, &emac_p->supp.set); + udelay(DELAY_10MSEC); + writel(EMAC_RMII_RESET, &emac_p->supp.clr); + } + + return pic32_mdio_init(PIC32_MDIO_NAME, (ulong)&emac_p->mii); +} + +static int _phy_init(struct pic32eth_device *pedev, void *dev) +{ + struct mii_dev *mii; + + mii = miiphy_get_dev_by_name(PIC32_MDIO_NAME); + + /* find & connect PHY */ + pedev->phydev = phy_connect(mii, pedev->phy_id, + dev, pedev->phyif); + if (!pedev->phydev) { + printf("%s: %s: Error, PHY connect\n", __FILE__, __func__); + return 0; + } + + /* Wait for phy to complete reset */ + udelay(DELAY_10MSEC); + + /* configure supported modes */ + pedev->phydev->supported = SUPPORTED_10baseT_Half | + SUPPORTED_10baseT_Full | + SUPPORTED_100baseT_Half | + SUPPORTED_100baseT_Full | + SUPPORTED_Autoneg; + + pedev->phydev->advertising = ADVERTISED_10baseT_Half | + ADVERTISED_10baseT_Full | + ADVERTISED_100baseT_Half | + ADVERTISED_100baseT_Full | + ADVERTISED_Autoneg; + + pedev->phydev->autoneg = AUTONEG_ENABLE; + + return 0; +} + +/* Configure MAC based on negotiated speed and duplex + * reported by PHY. + */ +static int _mac_adjust_link(struct pic32eth_device *pedev) +{ + struct phy_device *phydev = pedev->phydev; + struct pic32_emac_regs *emac_p = pedev->emac_regs; + + if (!phydev->link) { + printf("%s: No link.\n", phydev->dev->name); + return 0; + } + + if (phydev->duplex) { + writel(EMAC_FULLDUP, &emac_p->cfg2.set); + writel(FULLDUP_GAP_TIME, &emac_p->ipgt.raw); + } else { + writel(EMAC_FULLDUP, &emac_p->cfg2.clr); + writel(HALFDUP_GAP_TIME, &emac_p->ipgt.raw); + } + + switch (phydev->speed) { + case SPEED_100: + writel(EMAC_RMII_SPD100, &emac_p->supp.set); + break; + case SPEED_10: + writel(EMAC_RMII_SPD100, &emac_p->supp.clr); + break; + default: + printf("%s: Speed was bad\n", phydev->dev->name); + return 0; + } + + printf("pic32eth: PHY is %s with %dbase%s, %s\n", + phydev->drv->name, + phydev->speed, (phydev->port == PORT_TP) ? "T" : "X", + (phydev->duplex) ? "full" : "half"); + + return 1; +} + +static void _mac_init(struct pic32eth_device *pedev, u8 *macaddr) +{ + struct pic32_emac_regs *emac_p = pedev->emac_regs; + u32 stat = 0, v; + u64 expire; + + v = EMAC_TXPAUSE | EMAC_RXPAUSE | EMAC_RXENABLE; + writel(v, &emac_p->cfg1.raw); + + v = EMAC_EXCESS | EMAC_AUTOPAD | EMAC_PADENABLE | + EMAC_CRCENABLE | EMAC_LENGTHCK | EMAC_FULLDUP; + writel(v, &emac_p->cfg2.raw); + + /* recommended back-to-back inter-packet gap for 10 Mbps half duplex */ + writel(HALFDUP_GAP_TIME, &emac_p->ipgt.raw); + + /* recommended non-back-to-back interpacket gap is 0xc12 */ + writel(0xc12, &emac_p->ipgr.raw); + + /* recommended collision window retry limit is 0x370F */ + writel(0x370f, &emac_p->clrt.raw); + + /* set maximum frame length: allow VLAN tagged frame */ + writel(0x600, &emac_p->maxf.raw); + + /* set the mac address */ + writel(macaddr[0] | (macaddr[1] << 8), &emac_p->sa2.raw); + writel(macaddr[2] | (macaddr[3] << 8), &emac_p->sa1.raw); + writel(macaddr[4] | (macaddr[5] << 8), &emac_p->sa0.raw); + + /* default, enable 10 Mbps operation */ + writel(EMAC_RMII_SPD100, &emac_p->supp.clr); + + /* wait until link status UP or deadline elapsed */ + expire = get_ticks() + get_tbclk() * 2; + for (; get_ticks() < expire;) { + stat = phy_read(pedev->phydev, pedev->phy_id, MII_BMSR); + if (stat & BMSR_LSTATUS) + break; + } + + if (!(stat & BMSR_LSTATUS)) + printf("MAC: Link is DOWN!\n"); + + /* delay to stabilize before any tx/rx */ + udelay(DELAY_10MSEC); +} + +static void _mac_reset(struct pic32eth_device *pedev) +{ + struct mii_dev *mii; + struct pic32_emac_regs *emac_p = pedev->emac_regs; + + /* Reset MAC */ + writel(EMAC_SOFTRESET, &emac_p->cfg1.raw); + udelay(DELAY_10MSEC); + + /* clear reset */ + writel(0, &emac_p->cfg1.raw); + + /* Reset MII */ + mii = pedev->phydev->bus; + if (mii && mii->reset) + mii->reset(mii); +} + +/* initializes the MAC and PHY, then establishes a link */ +static void _eth_ctrl_reset(struct pic32eth_device *pedev) +{ + u32 v; + struct pic32_ectl_regs *ectl_p = pedev->ectl_regs; + + /* disable RX, TX & any other transactions */ + writel(ETHCON_ON | ETHCON_TXRTS | ETHCON_RXEN, &ectl_p->con1.clr); + + /* wait until not BUSY */ + while (readl(&ectl_p->stat.raw) & ETHSTAT_BUSY) + ; + /* decrement received buffcnt to zero. */ + while (readl(&ectl_p->stat.raw) & ETHSTAT_BUFCNT) + writel(ETHCON_BUFCDEC, &ectl_p->con1.set); + + /* clear any existing interrupt event */ + writel(0xffffffff, &ectl_p->irq.clr); + + /* clear RX/TX start address */ + writel(0xffffffff, &ectl_p->txst.clr); + writel(0xffffffff, &ectl_p->rxst.clr); + + /* clear the receive filters */ + writel(0x00ff, &ectl_p->rxfc.clr); + + /* set the receive filters + * ETH_FILT_CRC_ERR_REJECT + * ETH_FILT_RUNT_REJECT + * ETH_FILT_UCAST_ACCEPT + * ETH_FILT_MCAST_ACCEPT + * ETH_FILT_BCAST_ACCEPT + */ + v = ETHRXFC_BCEN | ETHRXFC_MCEN | ETHRXFC_UCEN | + ETHRXFC_RUNTEN | ETHRXFC_CRCOKEN; + writel(v, &ectl_p->rxfc.set); + + /* turn controller ON to access PHY over MII */ + writel(ETHCON_ON, &ectl_p->con1.set); +} + +static void _eth_desc_init(struct pic32eth_device *pedev) +{ + u32 idx, bufsz; + struct eth_dma_desc *rxd; + struct pic32_ectl_regs *ectl_p = pedev->ectl_regs; + + pedev->rxd_idx = 0; + for (idx = 0; idx < MAX_RX_DESCR; idx++) { + rxd = &pedev->rxd_ring[idx]; + + /* hw owned */ + rxd->hdr = EDH_NPV | EDH_EOWN | EDH_STICKY; + + /* packet buffer address */ + rxd->data_buff = virt_to_phys(net_rx_packets[idx]); + + /* link to next desc */ + rxd->next_ed = virt_to_phys(rxd + 1); + + /* reset status */ + rxd->stat1 = 0; + rxd->stat2 = 0; + + /* decrement bufcnt */ + writel(ETHCON_BUFCDEC, &ectl_p->con1.set); + } + + /* link last descr to beginning of list */ + rxd->next_ed = virt_to_phys(&pedev->rxd_ring[0]); + + /* flush rx ring */ + __dcache_flush(pedev->rxd_ring, sizeof(pedev->rxd_ring)); + + /* set rx desc-ring start address */ + writel((ulong)virt_to_phys(&pedev->rxd_ring[0]), &ectl_p->rxst.raw); + + /* RX Buffer size */ + bufsz = readl(&ectl_p->con2.raw); + bufsz &= ~(ETHCON_RXBUFSZ << ETHCON_RXBUFSZ_SHFT); + bufsz |= ((MAX_RX_BUF_SIZE / 16) << ETHCON_RXBUFSZ_SHFT); + writel(bufsz, &ectl_p->con2.raw); + + /* enable the receiver in hardware which allows hardware + * to DMA received pkts to the descriptor pointer address. + */ + writel(ETHCON_RXEN, &ectl_p->con1.set); +} + +static void _pic32eth_halt(struct pic32eth_device *pedev) +{ + struct pic32_ectl_regs *ectl_p = pedev->ectl_regs; + struct pic32_emac_regs *emac_p = pedev->emac_regs; + + /* Reset the phy if the controller is enabled */ + if (readl(&ectl_p->con1.raw) & ETHCON_ON) + phy_reset(pedev->phydev); + + /* Shut down the PHY */ + phy_shutdown(pedev->phydev); + + /* Stop rx/tx */ + writel(ETHCON_TXRTS | ETHCON_RXEN, &ectl_p->con1.clr); + udelay(DELAY_10MSEC); + + /* reset MAC */ + writel(EMAC_SOFTRESET, &emac_p->cfg1.raw); + + /* clear reset */ + writel(0, &emac_p->cfg1.raw); + udelay(DELAY_10MSEC); + + /* disable controller */ + writel(ETHCON_ON, &ectl_p->con1.clr); + udelay(DELAY_10MSEC); + + /* wait until everything is down */ + while (readl(&ectl_p->stat.raw) & ETHSTAT_BUSY) + ; + + /* clear any existing interrupt event */ + writel(0xffffffff, &ectl_p->irq.clr); +} + +static int _pic32eth_init(struct pic32eth_device *pedev, u8 *macaddr) +{ + /* configure controller */ + _eth_ctrl_reset(pedev); + + /* reset mac_regs */ + _mac_reset(pedev); + + /* configure the PHY */ + phy_config(pedev->phydev); + + /* initialize MAC */ + _mac_init(pedev, macaddr); + + /* init RX descriptor; TX descriptor is taken care in xmit */ + _eth_desc_init(pedev); + + /* Start up & update link status of PHY */ + phy_startup(pedev->phydev); + + /* adjust mac with phy link status */ + if (!_mac_adjust_link(pedev)) { + _pic32eth_halt(pedev); + return -1; + } + + /* If there's no link, fail */ + return pedev->phydev->link ? 0 : -1; +} + +static int _pic32eth_xmit(struct pic32eth_device *pedev, + void *packet, int length) +{ + u64 deadline; + struct eth_dma_desc *txd; + struct pic32_ectl_regs *ectl_p = pedev->ectl_regs; + + txd = &pedev->txd_ring[0]; + + /* set proper flags & length in descriptor header */ + txd->hdr = EDH_SOP | EDH_EOP | EDH_EOWN | EDH_BCOUNT(length); + + /* pass buffer address to hardware */ + txd->data_buff = virt_to_phys(packet); + + debug("%s: %d / .hdr %x, .data_buff %x, .stat %x, .nexted %x\n", + __func__, __LINE__, txd->hdr, txd->data_buff, txd->stat2, + txd->next_ed); + + /* cache flush (packet) */ + __dcache_flush(packet, length); + + /* cache flush (txd) */ + __dcache_flush(txd, sizeof(*txd)); + + /* pass descriptor table base to h/w */ + writel(virt_to_phys(txd), &ectl_p->txst.raw); + + /* ready to send enabled, hardware can now send the packet(s) */ + writel(ETHCON_TXRTS | ETHCON_ON, &ectl_p->con1.set); + + /* wait until tx has completed and h/w has released ownership + * of the tx descriptor or timeout elapsed. + */ + deadline = get_ticks() + get_tbclk(); + for (;;) { + /* check timeout */ + if (get_ticks() > deadline) + return -ETIMEDOUT; + + /* tx completed? */ + if (readl(&ectl_p->con1.raw) & ETHCON_TXRTS) + continue; + + /* h/w not released ownership yet? */ + __dcache_invalidate(txd, sizeof(*txd)); + if (!(txd->hdr & EDH_EOWN)) + break; + + if (ctrlc()) + break; + } + + return 0; +} + +static int _pic32eth_free_packet(struct pic32eth_device *pedev, uchar *packet) +{ + int idx; + struct eth_dma_desc *rxd; + struct pic32_ectl_regs *ectl_p = pedev->ectl_regs; + + idx = pedev->rxd_idx; + if (packet != net_rx_packets[idx]) { + printf("rxd_id %d: packet is not matched,\n", idx); + return -EAGAIN; + } + + /* prepare for new receive */ + rxd = &pedev->rxd_ring[idx]; + rxd->hdr = EDH_STICKY | EDH_NPV | EDH_EOWN; + + __dcache_flush(rxd, sizeof(*rxd)); + + /* decrement rx pkt count */ + writel(ETHCON_BUFCDEC, &ectl_p->con1.set); + + debug("%s: %d /fill-idx %i, .hdr=%x, .data_buff %x, .stat %x, .nexted %x / rx-idx %i\n", + __func__, __LINE__, idx, rxd->hdr, rxd->data_buff, + rxd->stat2, rxd->next_ed, pedev->rxd_idx); + + pedev->rxd_idx = (pedev->rxd_idx + 1) % MAX_RX_DESCR; + + return 0; +} + +static int _pic32eth_rx_poll(struct pic32eth_device *pedev, uchar **packetp) +{ + int idx, top; + u32 rx_stat; + int rx_count, bytes_rcvd = 0; + struct eth_dma_desc *rxd; + + top = (pedev->rxd_idx + MAX_RX_DESCR - 1) % MAX_RX_DESCR; + + /* non-blocking receive loop - receive until nothing left to receive */ + for (idx = pedev->rxd_idx; idx != top; idx = (idx + 1) % MAX_RX_DESCR) { + rxd = &pedev->rxd_ring[idx]; + + /* check ownership */ + __dcache_invalidate(rxd, sizeof(*rxd)); + if (rxd->hdr & EDH_EOWN) + break; + + if (rxd->hdr & EDH_SOP) { + if (!(rxd->hdr & EDH_EOP)) { + printf("%s: %s, rx pkt across multiple descr\n", + __FILE__, __func__); + goto refill_one; + } + + rx_stat = rxd->stat2; + rx_count = RSV_RX_COUNT(rx_stat); + + debug("%s: %d /rx-idx %i, .hdr=%x, .data_buff %x, .stat %x, .nexted %x\n", + __func__, __LINE__, idx, rxd->hdr, + rxd->data_buff, rxd->stat2, rxd->next_ed); + + /* we can do some basic checks */ + if ((!RSV_RX_OK(rx_stat)) || RSV_CRC_ERR(rx_stat)) { + debug("%s: %s: Error, rx problem detected\n", + __FILE__, __func__); + goto refill_one; + } + + /* invalidate dcache */ + __dcache_invalidate(net_rx_packets[idx], rx_count); + + /* increment number of bytes rcvd (ignore CRC) */ + bytes_rcvd += (rx_count - 4); + + /* Pass the packet to protocol layer */ + *packetp = net_rx_packets[idx]; + break; +refill_one: + _pic32eth_free_packet(pedev, net_rx_packets[idx]); + } + + if (ctrlc()) + break; + } + + return bytes_rcvd ? bytes_rcvd : -EAGAIN; +} + +static int pic32_eth_start(struct udevice *dev) +{ + struct eth_pdata *pdata = dev_get_platdata(dev); + struct pic32eth_device *priv = dev_get_priv(dev); + + return _pic32eth_init(priv, pdata->enetaddr); +} + +static int pic32_eth_send(struct udevice *dev, void *packet, int length) +{ + struct pic32eth_device *priv = dev_get_priv(dev); + + return _pic32eth_xmit(priv, packet, length); +} + +static int pic32_eth_recv(struct udevice *dev, int flags, uchar **packetp) +{ + struct pic32eth_device *priv = dev_get_priv(dev); + + return _pic32eth_rx_poll(priv, packetp); +} + +static int pic32_eth_free_pkt(struct udevice *dev, uchar *packet, int length) +{ + struct pic32eth_device *priv = dev_get_priv(dev); + + return _pic32eth_free_packet(priv, packet); +} + +static void pic32_eth_stop(struct udevice *dev) +{ + struct pic32eth_device *priv = dev_get_priv(dev); + + return _pic32eth_halt(priv); +} + +static const struct eth_ops pic32_eth_ops = { + .start = pic32_eth_start, + .send = pic32_eth_send, + .recv = pic32_eth_recv, + .free_pkt = pic32_eth_free_pkt, + .stop = pic32_eth_stop, +}; + +static int pic32_eth_probe(struct udevice *dev) +{ + struct eth_pdata *pdata = dev_get_platdata(dev); + struct pic32eth_device *priv = dev_get_priv(dev); + u32 iobase = pdata->iobase; + int phy_id = 0; + +#if defined(CONFIG_PHY_ADDR) + phy_id = CONFIG_PHY_ADDR; +#endif + /* initialize */ + priv->phy_id = phy_id; + priv->phyif = pdata->phy_interface; + priv->ectl_regs = (struct pic32_ectl_regs *)(iobase); + priv->emac_regs = (struct pic32_emac_regs *)(iobase + PIC32_EMAC1CFG1); + + gpio_request_by_name_nodev(gd->fdt_blob, dev->of_offset, + "reset-gpios", 0, + &priv->rst_gpio, GPIOD_IS_OUT); + _mdio_init(priv); + + return _phy_init(priv, dev); +} + +static int pic32_eth_remove(struct udevice *dev) +{ + struct pic32eth_device *priv = dev_get_priv(dev); + struct mii_dev *bus; + + dm_gpio_free(dev, &priv->rst_gpio); + phy_shutdown(priv->phydev); + free(priv->phydev); + bus = miiphy_get_dev_by_name(PIC32_MDIO_NAME); + mdio_unregister(bus); + mdio_free(bus); + + return 0; +} + +static int pic32_eth_ofdata_to_platdata(struct udevice *dev) +{ + struct eth_pdata *pdata = dev_get_platdata(dev); + const char *phy_mode; + + pdata->iobase = dev_get_addr(dev); + pdata->phy_interface = -1; + phy_mode = fdt_getprop(gd->fdt_blob, dev->of_offset, "phy-mode", NULL); + if (phy_mode) + pdata->phy_interface = phy_get_interface_by_name(phy_mode); + + if (pdata->phy_interface == -1) { + debug("%s: Invalid PHY interface '%s'\n", __func__, phy_mode); + return -EINVAL; + } + + return 0; +} + +static const struct udevice_id pic32_eth_ids[] = { + { .compatible = "microchip,pic32mzda-eth" }, + { } +}; + +U_BOOT_DRIVER(pic32_ethernet) = { + .name = "pic32_ethernet", + .id = UCLASS_ETH, + .of_match = pic32_eth_ids, + .ofdata_to_platdata = pic32_eth_ofdata_to_platdata, + .probe = pic32_eth_probe, + .remove = pic32_eth_remove, + .ops = &pic32_eth_ops, + .priv_auto_alloc_size = sizeof(struct pic32eth_device), + .platdata_auto_alloc_size = sizeof(struct eth_pdata), +}; diff --git a/drivers/net/pic32_eth.h b/drivers/net/pic32_eth.h new file mode 100644 index 0000000..29b822a --- /dev/null +++ b/drivers/net/pic32_eth.h @@ -0,0 +1,184 @@ +/* + * (c) 2015 Purna Chandra Mandal purna.mandal@microchip.com + * + * SPDX-License-Identifier: GPL-2.0+ + * + */ + +#ifndef PIC32_ETH_H +#define PIC32_ETH_H + +#include <stddef.h> +#include <asm/arch-pic32/pic32.h> + +/* Ethernet */ +struct pic32_ectl_regs { + struct pic32_reg_atomic con1; /* 0x00 */ + struct pic32_reg_atomic con2; /* 0x10 */ + struct pic32_reg_atomic txst; /* 0x20 */ + struct pic32_reg_atomic rxst; /* 0x30 */ + struct pic32_reg_atomic ht0; /* 0x40 */ + struct pic32_reg_atomic ht1; /* 0x50 */ + struct pic32_reg_atomic pmm0; /* 0x60 */ + struct pic32_reg_atomic pmm1; /* 0x70 */ + struct pic32_reg_atomic pmcs; /* 0x80 */ + struct pic32_reg_atomic pmo; /* 0x90 */ + struct pic32_reg_atomic rxfc; /* 0xA0 */ + struct pic32_reg_atomic rxwm; /* 0xB0 */ + struct pic32_reg_atomic ien; /* 0xC0 */ + struct pic32_reg_atomic irq; /* 0xD0 */ + struct pic32_reg_atomic stat; /* 0xE0 */ +}; + +struct pic32_mii_regs { + struct pic32_reg_atomic mcfg; /* 0x280 */ + struct pic32_reg_atomic mcmd; /* 0x290 */ + struct pic32_reg_atomic madr; /* 0x2a0 */ + struct pic32_reg_atomic mwtd; /* 0x2b0 */ + struct pic32_reg_atomic mrdd; /* 0x2c0 */ + struct pic32_reg_atomic mind; /* 0x2d0 */ +}; + +struct pic32_emac_regs { + struct pic32_reg_atomic cfg1; /* 0x200*/ + struct pic32_reg_atomic cfg2; /* 0x210*/ + struct pic32_reg_atomic ipgt; /* 0x220*/ + struct pic32_reg_atomic ipgr; /* 0x230*/ + struct pic32_reg_atomic clrt; /* 0x240*/ + struct pic32_reg_atomic maxf; /* 0x250*/ + struct pic32_reg_atomic supp; /* 0x260*/ + struct pic32_reg_atomic test; /* 0x270*/ + struct pic32_mii_regs mii; /* 0x280 - 0x2d0 */ + struct pic32_reg_atomic resv1[2]; /* 0x2e0 - 0x2f0 */ + struct pic32_reg_atomic sa0; /* 0x300 */ + struct pic32_reg_atomic sa1; /* 0x310 */ + struct pic32_reg_atomic sa2; /* 0x320 */ +}; + +/* ETHCON1 Reg field */ +#define ETHCON_ON 0x8000 +#define ETHCON_TXRTS 0x0200 +#define ETHCON_RXEN 0x0100 +#define ETHCON_BUFCDEC 0x0001 + +/* ETHCON2 Reg field */ +#define ETHCON_RXBUFSZ 0x7f +#define ETHCON_RXBUFSZ_SHFT 0x00000004 + +/* ETHSTAT Reg field */ +#define ETHSTAT_BUSY 0x00000080 +#define ETHSTAT_BUFCNT 0x00FF0000 + +/* ETHRXFC Register fields */ +#define ETHRXFC_CRCOKEN 0x0040 +#define ETHRXFC_RUNTEN 0x0010 +#define ETHRXFC_UCEN 0x0008 +#define ETHRXFC_MCEN 0x0002 +#define ETHRXFC_BCEN 0x0001 + +/* EMAC1CFG1 register offset */ +#define PIC32_EMAC1CFG1 0x0200 + +/* EMAC1CFG1 register fields */ +#define EMAC_SOFTRESET 0x8000 +#define EMAC_TXPAUSE 0x0008 +#define EMAC_RXPAUSE 0x0004 +#define EMAC_RXENABLE 0x0001 + +/* EMAC1CFG2 register fields */ +#define EMAC_EXCESS 0x4000 +#define EMAC_AUTOPAD 0x0080 +#define EMAC_PADENABLE 0x0020 +#define EMAC_CRCENABLE 0x0010 +#define EMAC_LENGTHCK 0x0002 +#define EMAC_FULLDUP 0x0001 + +/* EMAC1IPGT register magic */ +#define FULLDUP_GAP_TIME 0x15 +#define HALFDUP_GAP_TIME 0x12 + +/* EMAC1SUPP register fields */ +#define EMAC_RMII_SPD100 0x0100 +#define EMAC_RMII_RESET 0x0800 + +/* MII Management Configuration Register */ +#define MIIMCFG_RSTMGMT 0x8000 +#define MIIMCFG_CLKSEL_DIV40 0x0020 /* 100Mhz / 40 */ + +/* MII Management Command Register */ +#define MIIMCMD_READ 0x01 +#define MIIMCMD_SCAN 0x02 + +/* MII Management Address Register */ +#define MIIMADD_PHYADDR_SHIFT 8 +#define MIIMADD_REGADDR 0x1f +#define MIIMADD_REGADDR_SHIFT 0 + +/* MII Management Indicator Register */ +#define MIIMIND_BUSY 0x01 +#define MIIMIND_NOTVALID 0x04 +#define MIIMIND_LINKFAIL 0x08 + +/* Packet Descriptor + * + * Descriptor of a packet accepted by the TX/RX Ethernet engine. + * ref: PIC32 Family Reference Manual Table 35-7 + * + * A packet handled by the Ethernet TX/RX engine is a list of buffer + * descriptors. A packet may consist of more than one buffer. + * Each buffer needs a descriptor. + * + */ + +/* Received Packet Status */ +#define _RSV1_PKT_CSUM 0xffff +#define _RSV2_RX_OK (1 << 23) +#define _RSV2_LEN_ERR (1 << 21) +#define _RSV2_CRC_ERR (1 << 20) +#define _RSV2_RX_COUNT 0xffff + +#define RSV_RX_CSUM(__rsv1) ((__rsv1) & _RSV1_PKT_CSUM) +#define RSV_RX_COUNT(__rsv2) ((__rsv2) & _RSV2_RX_COUNT) +#define RSV_RX_OK(__rsv2) ((__rsv2) & _RSV2_RX_OK) +#define RSV_CRC_ERR(__rsv2) ((__rsv2) & _RSV2_CRC_ERR) + +/* Ethernet Hardware Descriptor Header bits */ +#define EDH_EOWN 0x00000080 +#define EDH_NPV 0x00000100 +#define EDH_STICKY 0x00000200 +#define _EDH_BCOUNT 0x07ff0000 +#define EDH_EOP 0x40000000 +#define EDH_SOP 0x80000000 +#define EDH_BCOUNT_SHIFT 16 +#define EDH_BCOUNT(len) ((len) << EDH_BCOUNT_SHIFT) + +/* Ethernet Hardware Descriptors + * ref: PIC32 Family Reference Manual Table 35-7 + * + * This structure represents the layout of the DMA + * memory shared between the CPU and the Ethernet + * controller. + */ +/* TX/RX DMA descriptor */ +struct eth_dma_desc { + u32 hdr; /* header */ + u32 data_buff; /* data buffer address */ + u32 stat1; /* transmit/receive packet status */ + u32 stat2; /* transmit/receive packet status */ + u32 next_ed; /* next descriptor */ +}; + +/* Delay/Timeout range */ +#define DELAY_10MSEC 10000UL + +/* cache ops helper */ +#define __dcache_flush(__a, __l) \ + flush_dcache_range((ulong)(__a), ((__l) + (ulong)(__a))) + +#define __dcache_invalidate(__a, __l) \ + invalidate_dcache_range((ulong)(__a), ((__l) + (ulong)(__a))) + +#define PIC32_MDIO_NAME "PIC32-EMAC" +int pic32_mdio_init(const char *name, ulong ioaddr); + +#endif /**/ diff --git a/drivers/net/pic32_mdio.c b/drivers/net/pic32_mdio.c new file mode 100644 index 0000000..b27eac4 --- /dev/null +++ b/drivers/net/pic32_mdio.c @@ -0,0 +1,143 @@ +/* + * pic32_mdio.c: PIC32 MDIO/MII driver, part of pic32_eth.c. + * + * Copyright 2015 Microchip Inc. + * Purna Chandra Mandal purna.mandal@microchip.com + * + * SPDX-License-Identifier: GPL-2.0+ + */ +#include <common.h> +#include <miiphy.h> +#include <phy.h> +#include <asm/io.h> + +#include "pic32_eth.h" + +#if !defined(CONFIG_MII) +# error "MIC32-PEMAC requires MII -- missing CONFIG_MII" +#endif + +#if !defined(CONFIG_PHYLIB) +# error "PIC32-PEMAC requires PHYLIB -- missing CONFIG_PHYLIB" +#endif + +static inline int wait_till_busy(struct pic32_mii_regs *mii_regs, + u32 mask, u32 exp) +{ + ulong start, timeout = get_tbclk() * 2; + + start = get_timer(0); + for (;;) { + if ((readl(&mii_regs->mind) & mask) == exp) + return 0; + + if (get_timer(start) > timeout) + break; + } + + printf("%s, %s: wait timedout\n", __FILE__, __func__); + return -1; +} + +static int pic32_mdio_write(struct mii_dev *bus, + int addr, int dev_addr, + int reg, u16 value) +{ + u32 v; + struct pic32_mii_regs *mii_regs = bus->priv; + + /* Wait for the previous operation to finish */ + wait_till_busy(mii_regs, MIIMIND_BUSY, 0); + + /* Put phyaddr and regaddr into MIIMADD */ + v = (addr << MIIMADD_PHYADDR_SHIFT) | (reg & MIIMADD_REGADDR); + writel(v, &mii_regs->madr); + + /* Initiate a write command */ + writel(value, &mii_regs->mwtd); + + /* Wait 30 clock cycles for busy flag to be set */ + udelay(1); + + /* Wait for write to complete */ + wait_till_busy(mii_regs, MIIMIND_BUSY, 0); + + return 0; +} + +static int pic32_mdio_read(struct mii_dev *bus, int addr, int devaddr, int reg) +{ + u32 v; + struct pic32_mii_regs *mii_regs = bus->priv; + + /* Wait for the previous operation to finish */ + wait_till_busy(mii_regs, MIIMIND_BUSY, 0); + + /* Put phyaddr and regaddr into MIIMADD */ + v = (addr << MIIMADD_PHYADDR_SHIFT) | (reg & MIIMADD_REGADDR); + writel(v, &mii_regs->madr); + + /* Initiate a read command */ + writel(MIIMCMD_READ, &mii_regs->mcmd); + + /* Wait 30 clock cycles for busy flag to be set */ + udelay(1); + + /* Wait for read to complete */ + wait_till_busy(mii_regs, MIIMIND_NOTVALID | MIIMIND_BUSY, 0); + + /* Clear the command register */ + writel(0, &mii_regs->mcmd); + + /* Grab the value read from the PHY */ + v = readl(&mii_regs->mrdd); + return v; +} + +static int pic32_mdio_reset(struct mii_dev *bus) +{ + struct pic32_mii_regs *mii_regs = bus->priv; + + /* Reset MII (due to new addresses) */ + writel(MIIMCFG_RSTMGMT, &mii_regs->mcfg); + + /* Wait for the operation to finish */ + while (readl(&mii_regs->mind) & MIIMIND_BUSY) + ; + + /* Clear reset bit */ + writel(0, &mii_regs->mcfg); + + /* Wait for the operation to finish */ + while (readl(&mii_regs->mind) & MIIMIND_BUSY) + ; + + /* Set the MII Management Clock (MDC) - no faster than 2.5 MHz */ + writel(MIIMCFG_CLKSEL_DIV40, &mii_regs->mcfg); + + /* Wait for the operation to finish */ + while (readl(&mii_regs->mind) & MIIMIND_BUSY) + ; + + return 0; +} + +int pic32_mdio_init(const char *name, ulong ioaddr) +{ + struct mii_dev *bus; + + bus = mdio_alloc(); + if (!bus) { + printf("Failed to allocate PIC32-MDIO bus\n"); + return -1; + } + + bus->read = pic32_mdio_read; + bus->write = pic32_mdio_write; + bus->reset = pic32_mdio_reset; + sprintf(bus->name, name); + + bus->priv = (void *)ioaddr; + + return mdio_register(bus); +}