[U-Boot] [PATCH v3 13/14] drivers: net: Add ethernet driver for Microchip PIC32.

Purna Chandra Mandal
2016-01-12T10:18:28Z

This driver implements MAC and MII layer of the ethernet controller.
Network data transfer is handled by controller internal DMA engine.
Ethernet controller is configurable through device-tree file.

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

---

Changes in v3:
- merge wrappers with eth operation callbacks
- read phy address from device-tree
- rename functions (e.g. _eth_xyz() with pic32_eth_xyz())

Changes in v2: None

drivers/net/Kconfig | 7 +
drivers/net/Makefile | 1 +
drivers/net/pic32_eth.c | 606 +++++++++++++++++++++++++++++++++++++++++++++++
drivers/net/pic32_eth.h | 171 +++++++++++++
drivers/net/pic32_mdio.c | 121 ++++++++++
5 files changed, 906 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 ae5e78d..dc49493 100644
--- a/drivers/net/Kconfig
+++ b/drivers/net/Kconfig
@@ -108,4 +108,11 @@ config ZYNQ_GEM
help
This MAC is present 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..1cef62e
--- /dev/null
+++ b/drivers/net/pic32_eth.c
@@ -0,0 +1,606 @@
+/*
+ * (c) 2015 Purna Chandra Mandal <purna.mandal@microchip.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ *
+ */
+#include <common.h>
+#include <errno.h>
+#include <dm.h>
+#include <net.h>
+#include <miiphy.h>
+#include <console.h>
+#include <wait_bit.h>
+#include <asm/gpio.h>
+
+#include "pic32_eth.h"
+
+#define MAX_RX_BUF_SIZE 1536
+#define MAX_RX_DESCR PKTBUFSRX
+#define MAX_TX_DESCR 2
+
+DECLARE_GLOBAL_DATA_PTR;
+
+struct pic32eth_dev {
+ struct eth_dma_desc rxd_ring[MAX_RX_DESCR];
+ struct eth_dma_desc txd_ring[MAX_TX_DESCR];
+ u32 rxd_idx; /* index of RX desc to read */
+ /* regs */
+ struct pic32_ectl_regs *ectl_regs;
+ struct pic32_emac_regs *emac_regs;
+ /* Phy */
+ struct phy_device *phydev;
+ phy_interface_t phyif;
+ u32 phy_addr;
+ struct gpio_desc rst_gpio;
+};
+
+void __weak board_netphy_reset(void *dev)
+{
+ struct pic32eth_dev *priv = (struct pic32eth_dev *)dev;
+
+ if (!dm_gpio_is_valid(&priv->rst_gpio))
+ return;
+
+ /* phy reset */
+ dm_gpio_set_value(&priv->rst_gpio, 0);
+ udelay(300);
+ dm_gpio_set_value(&priv->rst_gpio, 1);
+ udelay(300);
+}
+
+/* Initialize mii(MDIO) interface, discover which PHY is
+ * attached to the device, and configure it properly.
+ */
+static int pic32_mii_init(struct pic32eth_dev *priv)
+{
+ struct pic32_ectl_regs *ectl_p = priv->ectl_regs;
+ struct pic32_emac_regs *emac_p = priv->emac_regs;
+
+ /* board phy reset */
+ board_netphy_reset(priv);
+
+ /* disable RX, TX & all transactions */
+ writel(ETHCON_ON | ETHCON_TXRTS | ETHCON_RXEN, &ectl_p->con1.clr);
+
+ /* wait till busy */
+ wait_for_bit(__func__, &ectl_p->stat.raw, ETHSTAT_BUSY, false,
+ CONFIG_SYS_HZ, false);
+
+ /* turn controller ON to access PHY over MII */
+ writel(ETHCON_ON, &ectl_p->con1.set);
+
+ mdelay(10);
+
+ /* reset MAC */
+ writel(EMAC_SOFTRESET, &emac_p->cfg1.set); /* reset assert */
+ mdelay(10);
+ writel(EMAC_SOFTRESET, &emac_p->cfg1.clr); /* reset deassert */
+
+ /* initialize MDIO/MII */
+ if (priv->phyif == PHY_INTERFACE_MODE_RMII) {
+ writel(EMAC_RMII_RESET, &emac_p->supp.set);
+ mdelay(10);
+ writel(EMAC_RMII_RESET, &emac_p->supp.clr);
+ }
+
+ return pic32_mdio_init(PIC32_MDIO_NAME, (ulong)&emac_p->mii);
+}
+
+static int pic32_phy_init(struct pic32eth_dev *priv, struct udevice *dev)
+{
+ struct mii_dev *mii;
+
+ mii = miiphy_get_dev_by_name(PIC32_MDIO_NAME);
+
+ /* find & connect PHY */
+ priv->phydev = phy_connect(mii, priv->phy_addr,
+ dev, priv->phyif);
+ if (!priv->phydev) {
+ printf("%s: %s: Error, PHY connect\n", __FILE__, __func__);
+ return 0;
+ }
+
+ /* Wait for phy to complete reset */
+ mdelay(10);
+
+ /* configure supported modes */
+ priv->phydev->supported = SUPPORTED_10baseT_Half |
+ SUPPORTED_10baseT_Full |
+ SUPPORTED_100baseT_Half |
+ SUPPORTED_100baseT_Full |
+ SUPPORTED_Autoneg;
+
+ priv->phydev->advertising = ADVERTISED_10baseT_Half |
+ ADVERTISED_10baseT_Full |
+ ADVERTISED_100baseT_Half |
+ ADVERTISED_100baseT_Full |
+ ADVERTISED_Autoneg;
+
+ priv->phydev->autoneg = AUTONEG_ENABLE;
+
+ return 0;
+}
+
+/* Configure MAC based on negotiated speed and duplex
+ * reported by PHY.
+ */
+static int pic32_mac_adjust_link(struct pic32eth_dev *priv)
+{
+ struct phy_device *phydev = priv->phydev;
+ struct pic32_emac_regs *emac_p = priv->emac_regs;
+
+ if (!phydev->link) {
+ printf("%s: No link.\n", phydev->dev->name);
+ return -EINVAL;
+ }
+
+ 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 -EINVAL;
+ }
+
+ 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 0;
+}
+
+static void pic32_mac_init(struct pic32eth_dev *priv, u8 *macaddr)
+{
+ struct pic32_emac_regs *emac_p = priv->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(priv->phydev, priv->phy_addr, MII_BMSR);
+ if (stat & BMSR_LSTATUS)
+ break;
+ }
+
+ if (!(stat & BMSR_LSTATUS))
+ printf("MAC: Link is DOWN!\n");
+
+ /* delay to stabilize before any tx/rx */
+ mdelay(10);
+}
+
+static void pic32_mac_reset(struct pic32eth_dev *priv)
+{
+ struct pic32_emac_regs *emac_p = priv->emac_regs;
+ struct mii_dev *mii;
+
+ /* Reset MAC */
+ writel(EMAC_SOFTRESET, &emac_p->cfg1.raw);
+ mdelay(10);
+
+ /* clear reset */
+ writel(0, &emac_p->cfg1.raw);
+
+ /* Reset MII */
+ mii = priv->phydev->bus;
+ if (mii && mii->reset)
+ mii->reset(mii);
+}
+
+/* initializes the MAC and PHY, then establishes a link */
+static void pic32_ctrl_reset(struct pic32eth_dev *priv)
+{
+ struct pic32_ectl_regs *ectl_p = priv->ectl_regs;
+ u32 v;
+
+ /* disable RX, TX & any other transactions */
+ writel(ETHCON_ON | ETHCON_TXRTS | ETHCON_RXEN, &ectl_p->con1.clr);
+
+ /* wait till busy */
+ wait_for_bit(__func__, &ectl_p->stat.raw, ETHSTAT_BUSY, false,
+ CONFIG_SYS_HZ, false);
+ /* 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 pic32_rx_desc_init(struct pic32eth_dev *priv)
+{
+ struct pic32_ectl_regs *ectl_p = priv->ectl_regs;
+ struct eth_dma_desc *rxd;
+ u32 idx, bufsz;
+
+ priv->rxd_idx = 0;
+ for (idx = 0; idx < MAX_RX_DESCR; idx++) {
+ rxd = &priv->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(&priv->rxd_ring[0]);
+
+ /* flush rx ring */
+ __dcache_flush(priv->rxd_ring, sizeof(priv->rxd_ring));
+
+ /* set rx desc-ring start address */
+ writel((ulong)virt_to_phys(&priv->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 int pic32_eth_start(struct udevice *dev)
+{
+ struct eth_pdata *pdata = dev_get_platdata(dev);
+ struct pic32eth_dev *priv = dev_get_priv(dev);
+
+ /* controller */
+ pic32_ctrl_reset(priv);
+
+ /* reset MAC */
+ pic32_mac_reset(priv);
+
+ /* configure PHY */
+ phy_config(priv->phydev);
+
+ /* initialize MAC */
+ pic32_mac_init(priv, &pdata->enetaddr[0]);
+
+ /* init RX descriptor; TX descriptors are handled in xmit */
+ pic32_rx_desc_init(priv);
+
+ /* Start up & update link status of PHY */
+ phy_startup(priv->phydev);
+
+ /* adjust mac with phy link status */
+ return pic32_mac_adjust_link(priv);
+}
+
+static void pic32_eth_stop(struct udevice *dev)
+{
+ struct pic32eth_dev *priv = dev_get_priv(dev);
+ struct pic32_ectl_regs *ectl_p = priv->ectl_regs;
+ struct pic32_emac_regs *emac_p = priv->emac_regs;
+
+ /* Reset the phy if the controller is enabled */
+ if (readl(&ectl_p->con1.raw) & ETHCON_ON)
+ phy_reset(priv->phydev);
+
+ /* Shut down the PHY */
+ phy_shutdown(priv->phydev);
+
+ /* Stop rx/tx */
+ writel(ETHCON_TXRTS | ETHCON_RXEN, &ectl_p->con1.clr);
+ mdelay(10);
+
+ /* reset MAC */
+ writel(EMAC_SOFTRESET, &emac_p->cfg1.raw);
+
+ /* clear reset */
+ writel(0, &emac_p->cfg1.raw);
+ mdelay(10);
+
+ /* disable controller */
+ writel(ETHCON_ON, &ectl_p->con1.clr);
+ mdelay(10);
+
+ /* wait until everything is down */
+ wait_for_bit(__func__, &ectl_p->stat.raw, ETHSTAT_BUSY, false,
+ 2 * CONFIG_SYS_HZ, false);
+
+ /* clear any existing interrupt event */
+ writel(0xffffffff, &ectl_p->irq.clr);
+}
+
+static int pic32_eth_send(struct udevice *dev, void *packet, int length)
+{
+ struct pic32eth_dev *priv = dev_get_priv(dev);
+ struct pic32_ectl_regs *ectl_p = priv->ectl_regs;
+ struct eth_dma_desc *txd;
+ u64 deadline;
+
+ txd = &priv->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;
+
+ if (ctrlc())
+ return -EINTR;
+
+ /* tx completed ? */
+ if (readl(&ectl_p->con1.raw) & ETHCON_TXRTS) {
+ udelay(1);
+ continue;
+ }
+
+ /* h/w not released ownership yet? */
+ __dcache_invalidate(txd, sizeof(*txd));
+ if (!(txd->hdr & EDH_EOWN))
+ break;
+ }
+
+ return 0;
+}
+
+static int pic32_eth_recv(struct udevice *dev, int flags, uchar **packetp)
+{
+ struct pic32eth_dev *priv = dev_get_priv(dev);
+ struct eth_dma_desc *rxd;
+ u32 idx = priv->rxd_idx;
+ u32 rx_count;
+
+ /* find the next ready to receive */
+ rxd = &priv->rxd_ring[idx];
+
+ __dcache_invalidate(rxd, sizeof(*rxd));
+ /* check if owned by MAC */
+ if (rxd->hdr & EDH_EOWN)
+ return -EAGAIN;
+
+ /* Sanity check on header: SOP and EOP */
+ if ((rxd->hdr & (EDH_SOP | EDH_EOP)) != (EDH_SOP | EDH_EOP)) {
+ printf("%s: %s, rx pkt across multiple descr\n",
+ __FILE__, __func__);
+ return 0;
+ }
+
+ debug("%s: %d /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);
+
+ /* Sanity check on rx_stat: OK, CRC */
+ if (!RSV_RX_OK(rxd->stat2) || RSV_CRC_ERR(rxd->stat2)) {
+ debug("%s: %s: Error, rx problem detected\n",
+ __FILE__, __func__);
+ return 0;
+ }
+
+ /* invalidate dcache */
+ rx_count = RSV_RX_COUNT(rxd->stat2);
+ __dcache_invalidate(net_rx_packets[idx], rx_count);
+
+ /* Pass the packet to protocol layer */
+ *packetp = net_rx_packets[idx];
+
+ /* increment number of bytes rcvd (ignore CRC) */
+ return rx_count - 4;
+}
+
+static int pic32_eth_free_pkt(struct udevice *dev, uchar *packet, int length)
+{
+ struct pic32eth_dev *priv = dev_get_priv(dev);
+ struct pic32_ectl_regs *ectl_p = priv->ectl_regs;
+ struct eth_dma_desc *rxd;
+ int idx = priv->rxd_idx;
+
+ /* sanity check */
+ if (packet != net_rx_packets[idx]) {
+ printf("rxd_id %d: packet is not matched,\n", idx);
+ return -EAGAIN;
+ }
+
+ /* prepare for receive */
+ rxd = &priv->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 / 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);
+
+ priv->rxd_idx = (priv->rxd_idx + 1) % MAX_RX_DESCR;
+
+ return 0;
+}
+
+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_dev *priv = dev_get_priv(dev);
+ const char *phy_mode;
+ void __iomem *iobase;
+ fdt_addr_t addr;
+ fdt_size_t size;
+ int offset = 0;
+ int phy_addr = -1;
+
+ addr = fdtdec_get_addr_size(gd->fdt_blob, dev->of_offset, "reg", &size);
+ if (addr == FDT_ADDR_T_NONE)
+ return -EINVAL;
+
+ iobase = ioremap(addr, size);
+ if (!iobase)
+ return -EINVAL;
+
+ pdata->iobase = (phys_addr_t)addr;
+
+ /* get phy mode */
+ 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;
+ }
+
+ /* get phy addr */
+ offset = fdtdec_lookup_phandle(gd->fdt_blob, dev->of_offset,
+ "phy-handle");
+ if (offset > 0)
+ phy_addr = fdtdec_get_int(gd->fdt_blob, offset, "reg", -1);
+
+ /* phy reset gpio */
+ gpio_request_by_name_nodev(gd->fdt_blob, dev->of_offset,
+ "reset-gpios", 0,
+ &priv->rst_gpio, GPIOD_IS_OUT);
+
+ priv->phyif = pdata->phy_interface;
+ priv->phy_addr = phy_addr;
+ priv->ectl_regs = iobase;
+ priv->emac_regs = iobase + PIC32_EMAC1CFG1;
+
+ pic32_mii_init(priv);
+
+ return pic32_phy_init(priv, dev);
+}
+
+static int pic32_eth_remove(struct udevice *dev)
+{
+ struct pic32eth_dev *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);
+ iounmap(priv->ectl_regs);
+ 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,
+ .probe = pic32_eth_probe,
+ .remove = pic32_eth_remove,
+ .ops = &pic32_eth_ops,
+ .priv_auto_alloc_size = sizeof(struct pic32eth_dev),
+ .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..4dd443b
--- /dev/null
+++ b/drivers/net/pic32_eth.h
@@ -0,0 +1,171 @@
+/*
+ * (c) 2015 Purna Chandra Mandal <purna.mandal@microchip.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ *
+ */
+
+#ifndef __MICROCHIP_PIC32_ETH_H_
+#define __MICROCHIP_PIC32_ETH_H_
+
+#include <mach/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 res1; /* 0x2e0 */
+ struct pic32_reg_atomic res2; /* 0x2f0 */
+ struct pic32_reg_atomic sa0; /* 0x300 */
+ struct pic32_reg_atomic sa1; /* 0x310 */
+ struct pic32_reg_atomic sa2; /* 0x320 */
+};
+
+/* ETHCON1 Reg field */
+#define ETHCON_BUFCDEC BIT(0)
+#define ETHCON_RXEN BIT(8)
+#define ETHCON_TXRTS BIT(9)
+#define ETHCON_ON BIT(15)
+
+/* ETHCON2 Reg field */
+#define ETHCON_RXBUFSZ 0x7f
+#define ETHCON_RXBUFSZ_SHFT 0x4
+
+/* ETHSTAT Reg field */
+#define ETHSTAT_BUSY BIT(7)
+#define ETHSTAT_BUFCNT 0x00ff0000
+
+/* ETHRXFC Register fields */
+#define ETHRXFC_BCEN BIT(0)
+#define ETHRXFC_MCEN BIT(1)
+#define ETHRXFC_UCEN BIT(3)
+#define ETHRXFC_RUNTEN BIT(4)
+#define ETHRXFC_CRCOKEN BIT(5)
+
+/* EMAC1CFG1 register offset */
+#define PIC32_EMAC1CFG1 0x0200
+
+/* EMAC1CFG1 register fields */
+#define EMAC_RXENABLE BIT(0)
+#define EMAC_RXPAUSE BIT(2)
+#define EMAC_TXPAUSE BIT(3)
+#define EMAC_SOFTRESET BIT(15)
+
+/* EMAC1CFG2 register fields */
+#define EMAC_FULLDUP BIT(0)
+#define EMAC_LENGTHCK BIT(1)
+#define EMAC_CRCENABLE BIT(4)
+#define EMAC_PADENABLE BIT(5)
+#define EMAC_AUTOPAD BIT(7)
+#define EMAC_EXCESS BIT(14)
+
+/* EMAC1IPGT register magic */
+#define FULLDUP_GAP_TIME 0x15
+#define HALFDUP_GAP_TIME 0x12
+
+/* EMAC1SUPP register fields */
+#define EMAC_RMII_SPD100 BIT(8)
+#define EMAC_RMII_RESET BIT(11)
+
+/* MII Management Configuration Register */
+#define MIIMCFG_RSTMGMT BIT(15)
+#define MIIMCFG_CLKSEL_DIV40 0x0020 /* 100Mhz / 40 */
+
+/* MII Management Command Register */
+#define MIIMCMD_READ BIT(0)
+#define MIIMCMD_SCAN BIT(1)
+
+/* MII Management Address Register */
+#define MIIMADD_REGADDR 0x1f
+#define MIIMADD_REGADDR_SHIFT 0
+#define MIIMADD_PHYADDR_SHIFT 8
+
+/* MII Management Indicator Register */
+#define MIIMIND_BUSY BIT(0)
+#define MIIMIND_NOTVALID BIT(2)
+#define MIIMIND_LINKFAIL BIT(3)
+
+/* Packet Descriptor */
+/* Received Packet Status */
+#define _RSV1_PKT_CSUM 0xffff
+#define _RSV2_CRC_ERR BIT(20)
+#define _RSV2_LEN_ERR BIT(21)
+#define _RSV2_RX_OK BIT(23)
+#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 BIT(7)
+#define EDH_NPV BIT(8)
+#define EDH_STICKY BIT(9)
+#define _EDH_BCOUNT 0x07ff0000
+#define EDH_EOP BIT(30)
+#define EDH_SOP BIT(31)
+#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 */
+};
+
+/* cache operation 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 /* __MICROCHIP_PIC32_ETH_H_*/
diff --git a/drivers/net/pic32_mdio.c b/drivers/net/pic32_mdio.c
new file mode 100644
index 0000000..578fc96
--- /dev/null
+++ b/drivers/net/pic32_mdio.c
@@ -0,0 +1,121 @@
+/*
+ * 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 <phy.h>
+#include <miiphy.h>
+#include <errno.h>
+#include <wait_bit.h>
+#include <asm/io.h>
+#include "pic32_eth.h"
+
+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_for_bit(__func__, &mii_regs->mind.raw, MIIMIND_BUSY,
+ false, CONFIG_SYS_HZ, true);
+
+ /* Put phyaddr and regaddr into MIIMADD */
+ v = (addr << MIIMADD_PHYADDR_SHIFT) | (reg & MIIMADD_REGADDR);
+ writel(v, &mii_regs->madr.raw);
+
+ /* Initiate a write command */
+ writel(value, &mii_regs->mwtd.raw);
+
+ /* Wait 30 clock cycles for busy flag to be set */
+ udelay(12);
+
+ /* Wait for write to complete */
+ wait_for_bit(__func__, &mii_regs->mind.raw, MIIMIND_BUSY,
+ false, CONFIG_SYS_HZ, true);
+
+ 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_for_bit(__func__, &mii_regs->mind.raw, MIIMIND_BUSY,
+ false, CONFIG_SYS_HZ, true);
+
+ /* Put phyaddr and regaddr into MIIMADD */
+ v = (addr << MIIMADD_PHYADDR_SHIFT) | (reg & MIIMADD_REGADDR);
+ writel(v, &mii_regs->madr.raw);
+
+ /* Initiate a read command */
+ writel(MIIMCMD_READ, &mii_regs->mcmd.raw);
+
+ /* Wait 30 clock cycles for busy flag to be set */
+ udelay(12);
+
+ /* Wait for read to complete */
+ wait_for_bit(__func__, &mii_regs->mind.raw,
+ MIIMIND_NOTVALID | MIIMIND_BUSY,
+ false, CONFIG_SYS_HZ, false);
+
+ /* Clear the command register */
+ writel(0, &mii_regs->mcmd.raw);
+
+ /* Grab the value read from the PHY */
+ v = readl(&mii_regs->mrdd.raw);
+ 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.raw);
+
+ /* Wait for the operation to finish */
+ wait_for_bit(__func__, &mii_regs->mind.raw, MIIMIND_BUSY,
+ false, CONFIG_SYS_HZ, true);
+
+ /* Clear reset bit */
+ writel(0, &mii_regs->mcfg);
+
+ /* Wait for the operation to finish */
+ wait_for_bit(__func__, &mii_regs->mind.raw, MIIMIND_BUSY,
+ false, CONFIG_SYS_HZ, true);
+
+ /* Set the MII Management Clock (MDC) - no faster than 2.5 MHz */
+ writel(MIIMCFG_CLKSEL_DIV40, &mii_regs->mcfg.raw);
+
+ /* Wait for the operation to finish */
+ wait_for_bit(__func__, &mii_regs->mind.raw, MIIMIND_BUSY,
+ false, CONFIG_SYS_HZ, true);
+ 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 -ENOMEM;
+ }
+
+ bus->read = pic32_mdio_read;
+ bus->write = pic32_mdio_write;
+ bus->reset = pic32_mdio_reset;
+ strncpy(bus->name, name, sizeof(bus->name));
+ bus->priv = (void *)ioaddr;
+
+ return mdio_register(bus);
+}
--
1.8.3.1