483 lines
12 KiB
C
483 lines
12 KiB
C
/*
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* Ethernet driver for the Atmel AT91RM9200 (Thunder)
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*
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* Copyright (C) 2003 SAN People (Pty) Ltd
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*
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* Based on an earlier Atmel EMAC macrocell driver by Atmel and Lineo Inc.
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* Initial version by Rick Bronson 01/11/2003
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/skbuff.h>
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#include <linux/dma-mapping.h>
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#include <linux/ethtool.h>
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#include <linux/platform_data/macb.h>
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#include <linux/platform_device.h>
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#include <linux/clk.h>
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#include <linux/gfp.h>
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#include <linux/phy.h>
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#include <linux/io.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/of_net.h>
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#include "macb.h"
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/* 1518 rounded up */
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#define MAX_RBUFF_SZ 0x600
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/* max number of receive buffers */
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#define MAX_RX_DESCR 9
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/* Initialize and start the Receiver and Transmit subsystems */
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static int at91ether_start(struct net_device *dev)
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{
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struct macb *lp = netdev_priv(dev);
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dma_addr_t addr;
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u32 ctl;
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int i;
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lp->rx_ring = dma_alloc_coherent(&lp->pdev->dev,
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(MAX_RX_DESCR *
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sizeof(struct macb_dma_desc)),
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&lp->rx_ring_dma, GFP_KERNEL);
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if (!lp->rx_ring)
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return -ENOMEM;
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lp->rx_buffers = dma_alloc_coherent(&lp->pdev->dev,
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MAX_RX_DESCR * MAX_RBUFF_SZ,
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&lp->rx_buffers_dma, GFP_KERNEL);
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if (!lp->rx_buffers) {
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dma_free_coherent(&lp->pdev->dev,
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MAX_RX_DESCR * sizeof(struct macb_dma_desc),
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lp->rx_ring, lp->rx_ring_dma);
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lp->rx_ring = NULL;
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return -ENOMEM;
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}
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addr = lp->rx_buffers_dma;
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for (i = 0; i < MAX_RX_DESCR; i++) {
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lp->rx_ring[i].addr = addr;
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lp->rx_ring[i].ctrl = 0;
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addr += MAX_RBUFF_SZ;
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}
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/* Set the Wrap bit on the last descriptor */
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lp->rx_ring[MAX_RX_DESCR - 1].addr |= MACB_BIT(RX_WRAP);
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/* Reset buffer index */
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lp->rx_tail = 0;
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/* Program address of descriptor list in Rx Buffer Queue register */
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macb_writel(lp, RBQP, lp->rx_ring_dma);
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/* Enable Receive and Transmit */
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ctl = macb_readl(lp, NCR);
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macb_writel(lp, NCR, ctl | MACB_BIT(RE) | MACB_BIT(TE));
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return 0;
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}
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/* Open the ethernet interface */
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static int at91ether_open(struct net_device *dev)
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{
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struct macb *lp = netdev_priv(dev);
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u32 ctl;
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int ret;
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/* Clear internal statistics */
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ctl = macb_readl(lp, NCR);
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macb_writel(lp, NCR, ctl | MACB_BIT(CLRSTAT));
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macb_set_hwaddr(lp);
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ret = at91ether_start(dev);
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if (ret)
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return ret;
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/* Enable MAC interrupts */
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macb_writel(lp, IER, MACB_BIT(RCOMP) |
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MACB_BIT(RXUBR) |
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MACB_BIT(ISR_TUND) |
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MACB_BIT(ISR_RLE) |
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MACB_BIT(TCOMP) |
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MACB_BIT(ISR_ROVR) |
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MACB_BIT(HRESP));
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/* schedule a link state check */
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phy_start(lp->phy_dev);
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netif_start_queue(dev);
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return 0;
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}
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/* Close the interface */
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static int at91ether_close(struct net_device *dev)
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{
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struct macb *lp = netdev_priv(dev);
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u32 ctl;
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/* Disable Receiver and Transmitter */
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ctl = macb_readl(lp, NCR);
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macb_writel(lp, NCR, ctl & ~(MACB_BIT(TE) | MACB_BIT(RE)));
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/* Disable MAC interrupts */
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macb_writel(lp, IDR, MACB_BIT(RCOMP) |
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MACB_BIT(RXUBR) |
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MACB_BIT(ISR_TUND) |
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MACB_BIT(ISR_RLE) |
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MACB_BIT(TCOMP) |
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MACB_BIT(ISR_ROVR) |
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MACB_BIT(HRESP));
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netif_stop_queue(dev);
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dma_free_coherent(&lp->pdev->dev,
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MAX_RX_DESCR * sizeof(struct macb_dma_desc),
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lp->rx_ring, lp->rx_ring_dma);
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lp->rx_ring = NULL;
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dma_free_coherent(&lp->pdev->dev,
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MAX_RX_DESCR * MAX_RBUFF_SZ,
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lp->rx_buffers, lp->rx_buffers_dma);
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lp->rx_buffers = NULL;
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return 0;
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}
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/* Transmit packet */
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static int at91ether_start_xmit(struct sk_buff *skb, struct net_device *dev)
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{
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struct macb *lp = netdev_priv(dev);
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if (macb_readl(lp, TSR) & MACB_BIT(RM9200_BNQ)) {
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netif_stop_queue(dev);
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/* Store packet information (to free when Tx completed) */
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lp->skb = skb;
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lp->skb_length = skb->len;
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lp->skb_physaddr = dma_map_single(NULL, skb->data, skb->len,
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DMA_TO_DEVICE);
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/* Set address of the data in the Transmit Address register */
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macb_writel(lp, TAR, lp->skb_physaddr);
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/* Set length of the packet in the Transmit Control register */
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macb_writel(lp, TCR, skb->len);
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} else {
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netdev_err(dev, "%s called, but device is busy!\n", __func__);
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return NETDEV_TX_BUSY;
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}
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return NETDEV_TX_OK;
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}
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/* Extract received frame from buffer descriptors and sent to upper layers.
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* (Called from interrupt context)
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*/
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static void at91ether_rx(struct net_device *dev)
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{
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struct macb *lp = netdev_priv(dev);
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unsigned char *p_recv;
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struct sk_buff *skb;
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unsigned int pktlen;
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while (lp->rx_ring[lp->rx_tail].addr & MACB_BIT(RX_USED)) {
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p_recv = lp->rx_buffers + lp->rx_tail * MAX_RBUFF_SZ;
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pktlen = MACB_BF(RX_FRMLEN, lp->rx_ring[lp->rx_tail].ctrl);
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skb = netdev_alloc_skb(dev, pktlen + 2);
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if (skb) {
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skb_reserve(skb, 2);
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memcpy(skb_put(skb, pktlen), p_recv, pktlen);
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skb->protocol = eth_type_trans(skb, dev);
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lp->stats.rx_packets++;
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lp->stats.rx_bytes += pktlen;
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netif_rx(skb);
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} else {
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lp->stats.rx_dropped++;
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}
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if (lp->rx_ring[lp->rx_tail].ctrl & MACB_BIT(RX_MHASH_MATCH))
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lp->stats.multicast++;
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/* reset ownership bit */
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lp->rx_ring[lp->rx_tail].addr &= ~MACB_BIT(RX_USED);
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/* wrap after last buffer */
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if (lp->rx_tail == MAX_RX_DESCR - 1)
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lp->rx_tail = 0;
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else
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lp->rx_tail++;
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}
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}
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/* MAC interrupt handler */
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static irqreturn_t at91ether_interrupt(int irq, void *dev_id)
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{
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struct net_device *dev = dev_id;
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struct macb *lp = netdev_priv(dev);
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u32 intstatus, ctl;
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/* MAC Interrupt Status register indicates what interrupts are pending.
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* It is automatically cleared once read.
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*/
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intstatus = macb_readl(lp, ISR);
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/* Receive complete */
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if (intstatus & MACB_BIT(RCOMP))
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at91ether_rx(dev);
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/* Transmit complete */
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if (intstatus & MACB_BIT(TCOMP)) {
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/* The TCOM bit is set even if the transmission failed */
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if (intstatus & (MACB_BIT(ISR_TUND) | MACB_BIT(ISR_RLE)))
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lp->stats.tx_errors++;
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if (lp->skb) {
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dev_kfree_skb_irq(lp->skb);
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lp->skb = NULL;
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dma_unmap_single(NULL, lp->skb_physaddr, lp->skb_length, DMA_TO_DEVICE);
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lp->stats.tx_packets++;
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lp->stats.tx_bytes += lp->skb_length;
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}
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netif_wake_queue(dev);
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}
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/* Work-around for EMAC Errata section 41.3.1 */
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if (intstatus & MACB_BIT(RXUBR)) {
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ctl = macb_readl(lp, NCR);
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macb_writel(lp, NCR, ctl & ~MACB_BIT(RE));
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macb_writel(lp, NCR, ctl | MACB_BIT(RE));
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}
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if (intstatus & MACB_BIT(ISR_ROVR))
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netdev_err(dev, "ROVR error\n");
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return IRQ_HANDLED;
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}
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#ifdef CONFIG_NET_POLL_CONTROLLER
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static void at91ether_poll_controller(struct net_device *dev)
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{
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unsigned long flags;
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local_irq_save(flags);
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at91ether_interrupt(dev->irq, dev);
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local_irq_restore(flags);
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}
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#endif
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static const struct net_device_ops at91ether_netdev_ops = {
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.ndo_open = at91ether_open,
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.ndo_stop = at91ether_close,
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.ndo_start_xmit = at91ether_start_xmit,
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.ndo_get_stats = macb_get_stats,
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.ndo_set_rx_mode = macb_set_rx_mode,
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.ndo_set_mac_address = eth_mac_addr,
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.ndo_do_ioctl = macb_ioctl,
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.ndo_validate_addr = eth_validate_addr,
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.ndo_change_mtu = eth_change_mtu,
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#ifdef CONFIG_NET_POLL_CONTROLLER
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.ndo_poll_controller = at91ether_poll_controller,
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#endif
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};
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#if defined(CONFIG_OF)
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static const struct of_device_id at91ether_dt_ids[] = {
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{ .compatible = "cdns,at91rm9200-emac" },
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{ .compatible = "cdns,emac" },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(of, at91ether_dt_ids);
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#endif
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/* Detect MAC & PHY and perform ethernet interface initialization */
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static int __init at91ether_probe(struct platform_device *pdev)
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{
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struct macb_platform_data *board_data = dev_get_platdata(&pdev->dev);
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struct resource *regs;
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struct net_device *dev;
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struct phy_device *phydev;
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struct macb *lp;
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int res;
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u32 reg;
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const char *mac;
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regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!regs)
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return -ENOENT;
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dev = alloc_etherdev(sizeof(struct macb));
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if (!dev)
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return -ENOMEM;
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lp = netdev_priv(dev);
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lp->pdev = pdev;
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lp->dev = dev;
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spin_lock_init(&lp->lock);
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/* physical base address */
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dev->base_addr = regs->start;
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lp->regs = devm_ioremap(&pdev->dev, regs->start, resource_size(regs));
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if (!lp->regs) {
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res = -ENOMEM;
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goto err_free_dev;
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}
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/* Clock */
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lp->pclk = devm_clk_get(&pdev->dev, "ether_clk");
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if (IS_ERR(lp->pclk)) {
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res = PTR_ERR(lp->pclk);
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goto err_free_dev;
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}
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clk_enable(lp->pclk);
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lp->hclk = ERR_PTR(-ENOENT);
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lp->tx_clk = ERR_PTR(-ENOENT);
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/* Install the interrupt handler */
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dev->irq = platform_get_irq(pdev, 0);
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res = devm_request_irq(&pdev->dev, dev->irq, at91ether_interrupt, 0, dev->name, dev);
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if (res)
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goto err_disable_clock;
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dev->netdev_ops = &at91ether_netdev_ops;
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dev->ethtool_ops = &macb_ethtool_ops;
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platform_set_drvdata(pdev, dev);
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SET_NETDEV_DEV(dev, &pdev->dev);
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mac = of_get_mac_address(pdev->dev.of_node);
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if (mac)
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memcpy(lp->dev->dev_addr, mac, ETH_ALEN);
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else
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macb_get_hwaddr(lp);
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res = of_get_phy_mode(pdev->dev.of_node);
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if (res < 0) {
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if (board_data && board_data->is_rmii)
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lp->phy_interface = PHY_INTERFACE_MODE_RMII;
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else
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lp->phy_interface = PHY_INTERFACE_MODE_MII;
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} else {
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lp->phy_interface = res;
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}
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macb_writel(lp, NCR, 0);
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reg = MACB_BF(CLK, MACB_CLK_DIV32) | MACB_BIT(BIG);
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if (lp->phy_interface == PHY_INTERFACE_MODE_RMII)
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reg |= MACB_BIT(RM9200_RMII);
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macb_writel(lp, NCFGR, reg);
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/* Register the network interface */
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res = register_netdev(dev);
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if (res)
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goto err_disable_clock;
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res = macb_mii_init(lp);
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if (res)
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goto err_out_unregister_netdev;
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/* will be enabled in open() */
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netif_carrier_off(dev);
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phydev = lp->phy_dev;
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netdev_info(dev, "attached PHY driver [%s] (mii_bus:phy_addr=%s, irq=%d)\n",
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phydev->drv->name, dev_name(&phydev->dev),
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phydev->irq);
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/* Display ethernet banner */
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netdev_info(dev, "AT91 ethernet at 0x%08lx int=%d (%pM)\n",
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dev->base_addr, dev->irq, dev->dev_addr);
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return 0;
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err_out_unregister_netdev:
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unregister_netdev(dev);
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err_disable_clock:
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clk_disable(lp->pclk);
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err_free_dev:
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free_netdev(dev);
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return res;
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}
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static int at91ether_remove(struct platform_device *pdev)
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{
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struct net_device *dev = platform_get_drvdata(pdev);
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struct macb *lp = netdev_priv(dev);
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if (lp->phy_dev)
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phy_disconnect(lp->phy_dev);
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mdiobus_unregister(lp->mii_bus);
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kfree(lp->mii_bus->irq);
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mdiobus_free(lp->mii_bus);
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unregister_netdev(dev);
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clk_disable(lp->pclk);
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free_netdev(dev);
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return 0;
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}
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#ifdef CONFIG_PM
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static int at91ether_suspend(struct platform_device *pdev, pm_message_t mesg)
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{
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struct net_device *net_dev = platform_get_drvdata(pdev);
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struct macb *lp = netdev_priv(net_dev);
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if (netif_running(net_dev)) {
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netif_stop_queue(net_dev);
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netif_device_detach(net_dev);
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clk_disable(lp->pclk);
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}
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return 0;
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}
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static int at91ether_resume(struct platform_device *pdev)
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{
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struct net_device *net_dev = platform_get_drvdata(pdev);
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struct macb *lp = netdev_priv(net_dev);
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if (netif_running(net_dev)) {
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clk_enable(lp->pclk);
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netif_device_attach(net_dev);
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netif_start_queue(net_dev);
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}
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return 0;
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}
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#else
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#define at91ether_suspend NULL
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#define at91ether_resume NULL
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#endif
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static struct platform_driver at91ether_driver = {
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.remove = at91ether_remove,
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.suspend = at91ether_suspend,
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.resume = at91ether_resume,
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.driver = {
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.name = "at91_ether",
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.owner = THIS_MODULE,
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.of_match_table = of_match_ptr(at91ether_dt_ids),
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},
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};
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module_platform_driver_probe(at91ether_driver, at91ether_probe);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("AT91RM9200 EMAC Ethernet driver");
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MODULE_AUTHOR("Andrew Victor");
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MODULE_ALIAS("platform:at91_ether");
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