diff options
Diffstat (limited to 'drivers/net/ethernet/sun/sunbmac.c')
| -rw-r--r-- | drivers/net/ethernet/sun/sunbmac.c | 1280 |
1 files changed, 1280 insertions, 0 deletions
diff --git a/drivers/net/ethernet/sun/sunbmac.c b/drivers/net/ethernet/sun/sunbmac.c new file mode 100644 index 000000000..34b94153b --- /dev/null +++ b/drivers/net/ethernet/sun/sunbmac.c @@ -0,0 +1,1280 @@ +// SPDX-License-Identifier: GPL-2.0 +/* sunbmac.c: Driver for Sparc BigMAC 100baseT ethernet adapters. + * + * Copyright (C) 1997, 1998, 1999, 2003, 2008 David S. Miller (davem@davemloft.net) + */ + +#include <linux/module.h> +#include <linux/pgtable.h> + +#include <linux/kernel.h> +#include <linux/types.h> +#include <linux/fcntl.h> +#include <linux/interrupt.h> +#include <linux/ioport.h> +#include <linux/in.h> +#include <linux/string.h> +#include <linux/delay.h> +#include <linux/crc32.h> +#include <linux/errno.h> +#include <linux/ethtool.h> +#include <linux/mii.h> +#include <linux/netdevice.h> +#include <linux/etherdevice.h> +#include <linux/skbuff.h> +#include <linux/bitops.h> +#include <linux/dma-mapping.h> +#include <linux/of.h> +#include <linux/of_device.h> +#include <linux/gfp.h> + +#include <asm/auxio.h> +#include <asm/byteorder.h> +#include <asm/dma.h> +#include <asm/idprom.h> +#include <asm/io.h> +#include <asm/openprom.h> +#include <asm/oplib.h> + +#include "sunbmac.h" + +#define DRV_NAME "sunbmac" +#define DRV_VERSION "2.1" +#define DRV_RELDATE "August 26, 2008" +#define DRV_AUTHOR "David S. Miller (davem@davemloft.net)" + +static char version[] = + DRV_NAME ".c:v" DRV_VERSION " " DRV_RELDATE " " DRV_AUTHOR "\n"; + +MODULE_VERSION(DRV_VERSION); +MODULE_AUTHOR(DRV_AUTHOR); +MODULE_DESCRIPTION("Sun BigMAC 100baseT ethernet driver"); +MODULE_LICENSE("GPL"); + +#undef DEBUG_PROBE +#undef DEBUG_TX +#undef DEBUG_IRQ + +#ifdef DEBUG_PROBE +#define DP(x) printk x +#else +#define DP(x) +#endif + +#ifdef DEBUG_TX +#define DTX(x) printk x +#else +#define DTX(x) +#endif + +#ifdef DEBUG_IRQ +#define DIRQ(x) printk x +#else +#define DIRQ(x) +#endif + +#define DEFAULT_JAMSIZE 4 /* Toe jam */ + +#define QEC_RESET_TRIES 200 + +static int qec_global_reset(void __iomem *gregs) +{ + int tries = QEC_RESET_TRIES; + + sbus_writel(GLOB_CTRL_RESET, gregs + GLOB_CTRL); + while (--tries) { + if (sbus_readl(gregs + GLOB_CTRL) & GLOB_CTRL_RESET) { + udelay(20); + continue; + } + break; + } + if (tries) + return 0; + printk(KERN_ERR "BigMAC: Cannot reset the QEC.\n"); + return -1; +} + +static void qec_init(struct bigmac *bp) +{ + struct platform_device *qec_op = bp->qec_op; + void __iomem *gregs = bp->gregs; + u8 bsizes = bp->bigmac_bursts; + u32 regval; + + /* 64byte bursts do not work at the moment, do + * not even try to enable them. -DaveM + */ + if (bsizes & DMA_BURST32) + regval = GLOB_CTRL_B32; + else + regval = GLOB_CTRL_B16; + sbus_writel(regval | GLOB_CTRL_BMODE, gregs + GLOB_CTRL); + sbus_writel(GLOB_PSIZE_2048, gregs + GLOB_PSIZE); + + /* All of memsize is given to bigmac. */ + sbus_writel(resource_size(&qec_op->resource[1]), + gregs + GLOB_MSIZE); + + /* Half to the transmitter, half to the receiver. */ + sbus_writel(resource_size(&qec_op->resource[1]) >> 1, + gregs + GLOB_TSIZE); + sbus_writel(resource_size(&qec_op->resource[1]) >> 1, + gregs + GLOB_RSIZE); +} + +#define TX_RESET_TRIES 32 +#define RX_RESET_TRIES 32 + +static void bigmac_tx_reset(void __iomem *bregs) +{ + int tries = TX_RESET_TRIES; + + sbus_writel(0, bregs + BMAC_TXCFG); + + /* The fifo threshold bit is read-only and does + * not clear. -DaveM + */ + while ((sbus_readl(bregs + BMAC_TXCFG) & ~(BIGMAC_TXCFG_FIFO)) != 0 && + --tries != 0) + udelay(20); + + if (!tries) { + printk(KERN_ERR "BIGMAC: Transmitter will not reset.\n"); + printk(KERN_ERR "BIGMAC: tx_cfg is %08x\n", + sbus_readl(bregs + BMAC_TXCFG)); + } +} + +static void bigmac_rx_reset(void __iomem *bregs) +{ + int tries = RX_RESET_TRIES; + + sbus_writel(0, bregs + BMAC_RXCFG); + while (sbus_readl(bregs + BMAC_RXCFG) && --tries) + udelay(20); + + if (!tries) { + printk(KERN_ERR "BIGMAC: Receiver will not reset.\n"); + printk(KERN_ERR "BIGMAC: rx_cfg is %08x\n", + sbus_readl(bregs + BMAC_RXCFG)); + } +} + +/* Reset the transmitter and receiver. */ +static void bigmac_stop(struct bigmac *bp) +{ + bigmac_tx_reset(bp->bregs); + bigmac_rx_reset(bp->bregs); +} + +static void bigmac_get_counters(struct bigmac *bp, void __iomem *bregs) +{ + struct net_device_stats *stats = &bp->dev->stats; + + stats->rx_crc_errors += sbus_readl(bregs + BMAC_RCRCECTR); + sbus_writel(0, bregs + BMAC_RCRCECTR); + + stats->rx_frame_errors += sbus_readl(bregs + BMAC_UNALECTR); + sbus_writel(0, bregs + BMAC_UNALECTR); + + stats->rx_length_errors += sbus_readl(bregs + BMAC_GLECTR); + sbus_writel(0, bregs + BMAC_GLECTR); + + stats->tx_aborted_errors += sbus_readl(bregs + BMAC_EXCTR); + + stats->collisions += + (sbus_readl(bregs + BMAC_EXCTR) + + sbus_readl(bregs + BMAC_LTCTR)); + sbus_writel(0, bregs + BMAC_EXCTR); + sbus_writel(0, bregs + BMAC_LTCTR); +} + +static void bigmac_clean_rings(struct bigmac *bp) +{ + int i; + + for (i = 0; i < RX_RING_SIZE; i++) { + if (bp->rx_skbs[i] != NULL) { + dev_kfree_skb_any(bp->rx_skbs[i]); + bp->rx_skbs[i] = NULL; + } + } + + for (i = 0; i < TX_RING_SIZE; i++) { + if (bp->tx_skbs[i] != NULL) { + dev_kfree_skb_any(bp->tx_skbs[i]); + bp->tx_skbs[i] = NULL; + } + } +} + +static void bigmac_init_rings(struct bigmac *bp, bool non_blocking) +{ + struct bmac_init_block *bb = bp->bmac_block; + int i; + gfp_t gfp_flags = GFP_KERNEL; + + if (non_blocking) + gfp_flags = GFP_ATOMIC; + + bp->rx_new = bp->rx_old = bp->tx_new = bp->tx_old = 0; + + /* Free any skippy bufs left around in the rings. */ + bigmac_clean_rings(bp); + + /* Now get new skbufs for the receive ring. */ + for (i = 0; i < RX_RING_SIZE; i++) { + struct sk_buff *skb; + + skb = big_mac_alloc_skb(RX_BUF_ALLOC_SIZE, gfp_flags); + if (!skb) + continue; + + bp->rx_skbs[i] = skb; + + /* Because we reserve afterwards. */ + skb_put(skb, ETH_FRAME_LEN); + skb_reserve(skb, 34); + + bb->be_rxd[i].rx_addr = + dma_map_single(&bp->bigmac_op->dev, + skb->data, + RX_BUF_ALLOC_SIZE - 34, + DMA_FROM_DEVICE); + bb->be_rxd[i].rx_flags = + (RXD_OWN | ((RX_BUF_ALLOC_SIZE - 34) & RXD_LENGTH)); + } + + for (i = 0; i < TX_RING_SIZE; i++) + bb->be_txd[i].tx_flags = bb->be_txd[i].tx_addr = 0; +} + +#define MGMT_CLKON (MGMT_PAL_INT_MDIO|MGMT_PAL_EXT_MDIO|MGMT_PAL_OENAB|MGMT_PAL_DCLOCK) +#define MGMT_CLKOFF (MGMT_PAL_INT_MDIO|MGMT_PAL_EXT_MDIO|MGMT_PAL_OENAB) + +static void idle_transceiver(void __iomem *tregs) +{ + int i = 20; + + while (i--) { + sbus_writel(MGMT_CLKOFF, tregs + TCVR_MPAL); + sbus_readl(tregs + TCVR_MPAL); + sbus_writel(MGMT_CLKON, tregs + TCVR_MPAL); + sbus_readl(tregs + TCVR_MPAL); + } +} + +static void write_tcvr_bit(struct bigmac *bp, void __iomem *tregs, int bit) +{ + if (bp->tcvr_type == internal) { + bit = (bit & 1) << 3; + sbus_writel(bit | (MGMT_PAL_OENAB | MGMT_PAL_EXT_MDIO), + tregs + TCVR_MPAL); + sbus_readl(tregs + TCVR_MPAL); + sbus_writel(bit | MGMT_PAL_OENAB | MGMT_PAL_EXT_MDIO | MGMT_PAL_DCLOCK, + tregs + TCVR_MPAL); + sbus_readl(tregs + TCVR_MPAL); + } else if (bp->tcvr_type == external) { + bit = (bit & 1) << 2; + sbus_writel(bit | MGMT_PAL_INT_MDIO | MGMT_PAL_OENAB, + tregs + TCVR_MPAL); + sbus_readl(tregs + TCVR_MPAL); + sbus_writel(bit | MGMT_PAL_INT_MDIO | MGMT_PAL_OENAB | MGMT_PAL_DCLOCK, + tregs + TCVR_MPAL); + sbus_readl(tregs + TCVR_MPAL); + } else { + printk(KERN_ERR "write_tcvr_bit: No transceiver type known!\n"); + } +} + +static int read_tcvr_bit(struct bigmac *bp, void __iomem *tregs) +{ + int retval = 0; + + if (bp->tcvr_type == internal) { + sbus_writel(MGMT_PAL_EXT_MDIO, tregs + TCVR_MPAL); + sbus_readl(tregs + TCVR_MPAL); + sbus_writel(MGMT_PAL_EXT_MDIO | MGMT_PAL_DCLOCK, + tregs + TCVR_MPAL); + sbus_readl(tregs + TCVR_MPAL); + retval = (sbus_readl(tregs + TCVR_MPAL) & MGMT_PAL_INT_MDIO) >> 3; + } else if (bp->tcvr_type == external) { + sbus_writel(MGMT_PAL_INT_MDIO, tregs + TCVR_MPAL); + sbus_readl(tregs + TCVR_MPAL); + sbus_writel(MGMT_PAL_INT_MDIO | MGMT_PAL_DCLOCK, tregs + TCVR_MPAL); + sbus_readl(tregs + TCVR_MPAL); + retval = (sbus_readl(tregs + TCVR_MPAL) & MGMT_PAL_EXT_MDIO) >> 2; + } else { + printk(KERN_ERR "read_tcvr_bit: No transceiver type known!\n"); + } + return retval; +} + +static int read_tcvr_bit2(struct bigmac *bp, void __iomem *tregs) +{ + int retval = 0; + + if (bp->tcvr_type == internal) { + sbus_writel(MGMT_PAL_EXT_MDIO, tregs + TCVR_MPAL); + sbus_readl(tregs + TCVR_MPAL); + retval = (sbus_readl(tregs + TCVR_MPAL) & MGMT_PAL_INT_MDIO) >> 3; + sbus_writel(MGMT_PAL_EXT_MDIO | MGMT_PAL_DCLOCK, tregs + TCVR_MPAL); + sbus_readl(tregs + TCVR_MPAL); + } else if (bp->tcvr_type == external) { + sbus_writel(MGMT_PAL_INT_MDIO, tregs + TCVR_MPAL); + sbus_readl(tregs + TCVR_MPAL); + retval = (sbus_readl(tregs + TCVR_MPAL) & MGMT_PAL_EXT_MDIO) >> 2; + sbus_writel(MGMT_PAL_INT_MDIO | MGMT_PAL_DCLOCK, tregs + TCVR_MPAL); + sbus_readl(tregs + TCVR_MPAL); + } else { + printk(KERN_ERR "read_tcvr_bit2: No transceiver type known!\n"); + } + return retval; +} + +static void put_tcvr_byte(struct bigmac *bp, + void __iomem *tregs, + unsigned int byte) +{ + int shift = 4; + + do { + write_tcvr_bit(bp, tregs, ((byte >> shift) & 1)); + shift -= 1; + } while (shift >= 0); +} + +static void bigmac_tcvr_write(struct bigmac *bp, void __iomem *tregs, + int reg, unsigned short val) +{ + int shift; + + reg &= 0xff; + val &= 0xffff; + switch(bp->tcvr_type) { + case internal: + case external: + break; + + default: + printk(KERN_ERR "bigmac_tcvr_read: Whoops, no known transceiver type.\n"); + return; + } + + idle_transceiver(tregs); + write_tcvr_bit(bp, tregs, 0); + write_tcvr_bit(bp, tregs, 1); + write_tcvr_bit(bp, tregs, 0); + write_tcvr_bit(bp, tregs, 1); + + put_tcvr_byte(bp, tregs, + ((bp->tcvr_type == internal) ? + BIGMAC_PHY_INTERNAL : BIGMAC_PHY_EXTERNAL)); + + put_tcvr_byte(bp, tregs, reg); + + write_tcvr_bit(bp, tregs, 1); + write_tcvr_bit(bp, tregs, 0); + + shift = 15; + do { + write_tcvr_bit(bp, tregs, (val >> shift) & 1); + shift -= 1; + } while (shift >= 0); +} + +static unsigned short bigmac_tcvr_read(struct bigmac *bp, + void __iomem *tregs, + int reg) +{ + unsigned short retval = 0; + + reg &= 0xff; + switch(bp->tcvr_type) { + case internal: + case external: + break; + + default: + printk(KERN_ERR "bigmac_tcvr_read: Whoops, no known transceiver type.\n"); + return 0xffff; + } + + idle_transceiver(tregs); + write_tcvr_bit(bp, tregs, 0); + write_tcvr_bit(bp, tregs, 1); + write_tcvr_bit(bp, tregs, 1); + write_tcvr_bit(bp, tregs, 0); + + put_tcvr_byte(bp, tregs, + ((bp->tcvr_type == internal) ? + BIGMAC_PHY_INTERNAL : BIGMAC_PHY_EXTERNAL)); + + put_tcvr_byte(bp, tregs, reg); + + if (bp->tcvr_type == external) { + int shift = 15; + + (void) read_tcvr_bit2(bp, tregs); + (void) read_tcvr_bit2(bp, tregs); + + do { + int tmp; + + tmp = read_tcvr_bit2(bp, tregs); + retval |= ((tmp & 1) << shift); + shift -= 1; + } while (shift >= 0); + + (void) read_tcvr_bit2(bp, tregs); + (void) read_tcvr_bit2(bp, tregs); + (void) read_tcvr_bit2(bp, tregs); + } else { + int shift = 15; + + (void) read_tcvr_bit(bp, tregs); + (void) read_tcvr_bit(bp, tregs); + + do { + int tmp; + + tmp = read_tcvr_bit(bp, tregs); + retval |= ((tmp & 1) << shift); + shift -= 1; + } while (shift >= 0); + + (void) read_tcvr_bit(bp, tregs); + (void) read_tcvr_bit(bp, tregs); + (void) read_tcvr_bit(bp, tregs); + } + return retval; +} + +static void bigmac_tcvr_init(struct bigmac *bp) +{ + void __iomem *tregs = bp->tregs; + u32 mpal; + + idle_transceiver(tregs); + sbus_writel(MGMT_PAL_INT_MDIO | MGMT_PAL_EXT_MDIO | MGMT_PAL_DCLOCK, + tregs + TCVR_MPAL); + sbus_readl(tregs + TCVR_MPAL); + + /* Only the bit for the present transceiver (internal or + * external) will stick, set them both and see what stays. + */ + sbus_writel(MGMT_PAL_INT_MDIO | MGMT_PAL_EXT_MDIO, tregs + TCVR_MPAL); + sbus_readl(tregs + TCVR_MPAL); + udelay(20); + + mpal = sbus_readl(tregs + TCVR_MPAL); + if (mpal & MGMT_PAL_EXT_MDIO) { + bp->tcvr_type = external; + sbus_writel(~(TCVR_PAL_EXTLBACK | TCVR_PAL_MSENSE | TCVR_PAL_LTENABLE), + tregs + TCVR_TPAL); + sbus_readl(tregs + TCVR_TPAL); + } else if (mpal & MGMT_PAL_INT_MDIO) { + bp->tcvr_type = internal; + sbus_writel(~(TCVR_PAL_SERIAL | TCVR_PAL_EXTLBACK | + TCVR_PAL_MSENSE | TCVR_PAL_LTENABLE), + tregs + TCVR_TPAL); + sbus_readl(tregs + TCVR_TPAL); + } else { + printk(KERN_ERR "BIGMAC: AIEEE, neither internal nor " + "external MDIO available!\n"); + printk(KERN_ERR "BIGMAC: mgmt_pal[%08x] tcvr_pal[%08x]\n", + sbus_readl(tregs + TCVR_MPAL), + sbus_readl(tregs + TCVR_TPAL)); + } +} + +static int bigmac_init_hw(struct bigmac *, bool); + +static int try_next_permutation(struct bigmac *bp, void __iomem *tregs) +{ + if (bp->sw_bmcr & BMCR_SPEED100) { + int timeout; + + /* Reset the PHY. */ + bp->sw_bmcr = (BMCR_ISOLATE | BMCR_PDOWN | BMCR_LOOPBACK); + bigmac_tcvr_write(bp, tregs, MII_BMCR, bp->sw_bmcr); + bp->sw_bmcr = (BMCR_RESET); + bigmac_tcvr_write(bp, tregs, MII_BMCR, bp->sw_bmcr); + + timeout = 64; + while (--timeout) { + bp->sw_bmcr = bigmac_tcvr_read(bp, tregs, MII_BMCR); + if ((bp->sw_bmcr & BMCR_RESET) == 0) + break; + udelay(20); + } + if (timeout == 0) + printk(KERN_ERR "%s: PHY reset failed.\n", bp->dev->name); + + bp->sw_bmcr = bigmac_tcvr_read(bp, tregs, MII_BMCR); + + /* Now we try 10baseT. */ + bp->sw_bmcr &= ~(BMCR_SPEED100); + bigmac_tcvr_write(bp, tregs, MII_BMCR, bp->sw_bmcr); + return 0; + } + + /* We've tried them all. */ + return -1; +} + +static void bigmac_timer(struct timer_list *t) +{ + struct bigmac *bp = from_timer(bp, t, bigmac_timer); + void __iomem *tregs = bp->tregs; + int restart_timer = 0; + + bp->timer_ticks++; + if (bp->timer_state == ltrywait) { + bp->sw_bmsr = bigmac_tcvr_read(bp, tregs, MII_BMSR); + bp->sw_bmcr = bigmac_tcvr_read(bp, tregs, MII_BMCR); + if (bp->sw_bmsr & BMSR_LSTATUS) { + printk(KERN_INFO "%s: Link is now up at %s.\n", + bp->dev->name, + (bp->sw_bmcr & BMCR_SPEED100) ? + "100baseT" : "10baseT"); + bp->timer_state = asleep; + restart_timer = 0; + } else { + if (bp->timer_ticks >= 4) { + int ret; + + ret = try_next_permutation(bp, tregs); + if (ret == -1) { + printk(KERN_ERR "%s: Link down, cable problem?\n", + bp->dev->name); + ret = bigmac_init_hw(bp, true); + if (ret) { + printk(KERN_ERR "%s: Error, cannot re-init the " + "BigMAC.\n", bp->dev->name); + } + return; + } + bp->timer_ticks = 0; + restart_timer = 1; + } else { + restart_timer = 1; + } + } + } else { + /* Can't happens.... */ + printk(KERN_ERR "%s: Aieee, link timer is asleep but we got one anyways!\n", + bp->dev->name); + restart_timer = 0; + bp->timer_ticks = 0; + bp->timer_state = asleep; /* foo on you */ + } + + if (restart_timer != 0) { + bp->bigmac_timer.expires = jiffies + ((12 * HZ)/10); /* 1.2 sec. */ + add_timer(&bp->bigmac_timer); + } +} + +/* Well, really we just force the chip into 100baseT then + * 10baseT, each time checking for a link status. + */ +static void bigmac_begin_auto_negotiation(struct bigmac *bp) +{ + void __iomem *tregs = bp->tregs; + int timeout; + + /* Grab new software copies of PHY registers. */ + bp->sw_bmsr = bigmac_tcvr_read(bp, tregs, MII_BMSR); + bp->sw_bmcr = bigmac_tcvr_read(bp, tregs, MII_BMCR); + + /* Reset the PHY. */ + bp->sw_bmcr = (BMCR_ISOLATE | BMCR_PDOWN | BMCR_LOOPBACK); + bigmac_tcvr_write(bp, tregs, MII_BMCR, bp->sw_bmcr); + bp->sw_bmcr = (BMCR_RESET); + bigmac_tcvr_write(bp, tregs, MII_BMCR, bp->sw_bmcr); + + timeout = 64; + while (--timeout) { + bp->sw_bmcr = bigmac_tcvr_read(bp, tregs, MII_BMCR); + if ((bp->sw_bmcr & BMCR_RESET) == 0) + break; + udelay(20); + } + if (timeout == 0) + printk(KERN_ERR "%s: PHY reset failed.\n", bp->dev->name); + + bp->sw_bmcr = bigmac_tcvr_read(bp, tregs, MII_BMCR); + + /* First we try 100baseT. */ + bp->sw_bmcr |= BMCR_SPEED100; + bigmac_tcvr_write(bp, tregs, MII_BMCR, bp->sw_bmcr); + + bp->timer_state = ltrywait; + bp->timer_ticks = 0; + bp->bigmac_timer.expires = jiffies + (12 * HZ) / 10; + add_timer(&bp->bigmac_timer); +} + +static int bigmac_init_hw(struct bigmac *bp, bool non_blocking) +{ + void __iomem *gregs = bp->gregs; + void __iomem *cregs = bp->creg; + void __iomem *bregs = bp->bregs; + __u32 bblk_dvma = (__u32)bp->bblock_dvma; + const unsigned char *e = &bp->dev->dev_addr[0]; + + /* Latch current counters into statistics. */ + bigmac_get_counters(bp, bregs); + + /* Reset QEC. */ + qec_global_reset(gregs); + + /* Init QEC. */ + qec_init(bp); + + /* Alloc and reset the tx/rx descriptor chains. */ + bigmac_init_rings(bp, non_blocking); + + /* Initialize the PHY. */ + bigmac_tcvr_init(bp); + + /* Stop transmitter and receiver. */ + bigmac_stop(bp); + + /* Set hardware ethernet address. */ + sbus_writel(((e[4] << 8) | e[5]), bregs + BMAC_MACADDR2); + sbus_writel(((e[2] << 8) | e[3]), bregs + BMAC_MACADDR1); + sbus_writel(((e[0] << 8) | e[1]), bregs + BMAC_MACADDR0); + + /* Clear the hash table until mc upload occurs. */ + sbus_writel(0, bregs + BMAC_HTABLE3); + sbus_writel(0, bregs + BMAC_HTABLE2); + sbus_writel(0, bregs + BMAC_HTABLE1); + sbus_writel(0, bregs + BMAC_HTABLE0); + + /* Enable Big Mac hash table filter. */ + sbus_writel(BIGMAC_RXCFG_HENABLE | BIGMAC_RXCFG_FIFO, + bregs + BMAC_RXCFG); + udelay(20); + + /* Ok, configure the Big Mac transmitter. */ + sbus_writel(BIGMAC_TXCFG_FIFO, bregs + BMAC_TXCFG); + + /* The HME docs recommend to use the 10LSB of our MAC here. */ + sbus_writel(((e[5] | e[4] << 8) & 0x3ff), + bregs + BMAC_RSEED); + + /* Enable the output drivers no matter what. */ + sbus_writel(BIGMAC_XCFG_ODENABLE | BIGMAC_XCFG_RESV, + bregs + BMAC_XIFCFG); + + /* Tell the QEC where the ring descriptors are. */ + sbus_writel(bblk_dvma + bib_offset(be_rxd, 0), + cregs + CREG_RXDS); + sbus_writel(bblk_dvma + bib_offset(be_txd, 0), + cregs + CREG_TXDS); + + /* Setup the FIFO pointers into QEC local memory. */ + sbus_writel(0, cregs + CREG_RXRBUFPTR); + sbus_writel(0, cregs + CREG_RXWBUFPTR); + sbus_writel(sbus_readl(gregs + GLOB_RSIZE), + cregs + CREG_TXRBUFPTR); + sbus_writel(sbus_readl(gregs + GLOB_RSIZE), + cregs + CREG_TXWBUFPTR); + + /* Tell bigmac what interrupts we don't want to hear about. */ + sbus_writel(BIGMAC_IMASK_GOTFRAME | BIGMAC_IMASK_SENTFRAME, + bregs + BMAC_IMASK); + + /* Enable the various other irq's. */ + sbus_writel(0, cregs + CREG_RIMASK); + sbus_writel(0, cregs + CREG_TIMASK); + sbus_writel(0, cregs + CREG_QMASK); + sbus_writel(0, cregs + CREG_BMASK); + + /* Set jam size to a reasonable default. */ + sbus_writel(DEFAULT_JAMSIZE, bregs + BMAC_JSIZE); + + /* Clear collision counter. */ + sbus_writel(0, cregs + CREG_CCNT); + + /* Enable transmitter and receiver. */ + sbus_writel(sbus_readl(bregs + BMAC_TXCFG) | BIGMAC_TXCFG_ENABLE, + bregs + BMAC_TXCFG); + sbus_writel(sbus_readl(bregs + BMAC_RXCFG) | BIGMAC_RXCFG_ENABLE, + bregs + BMAC_RXCFG); + + /* Ok, start detecting link speed/duplex. */ + bigmac_begin_auto_negotiation(bp); + + /* Success. */ + return 0; +} + +/* Error interrupts get sent here. */ +static void bigmac_is_medium_rare(struct bigmac *bp, u32 qec_status, u32 bmac_status) +{ + printk(KERN_ERR "bigmac_is_medium_rare: "); + if (qec_status & (GLOB_STAT_ER | GLOB_STAT_BM)) { + if (qec_status & GLOB_STAT_ER) + printk("QEC_ERROR, "); + if (qec_status & GLOB_STAT_BM) + printk("QEC_BMAC_ERROR, "); + } + if (bmac_status & CREG_STAT_ERRORS) { + if (bmac_status & CREG_STAT_BERROR) + printk("BMAC_ERROR, "); + if (bmac_status & CREG_STAT_TXDERROR) + printk("TXD_ERROR, "); + if (bmac_status & CREG_STAT_TXLERR) + printk("TX_LATE_ERROR, "); + if (bmac_status & CREG_STAT_TXPERR) + printk("TX_PARITY_ERROR, "); + if (bmac_status & CREG_STAT_TXSERR) + printk("TX_SBUS_ERROR, "); + + if (bmac_status & CREG_STAT_RXDROP) + printk("RX_DROP_ERROR, "); + + if (bmac_status & CREG_STAT_RXSMALL) + printk("RX_SMALL_ERROR, "); + if (bmac_status & CREG_STAT_RXLERR) + printk("RX_LATE_ERROR, "); + if (bmac_status & CREG_STAT_RXPERR) + printk("RX_PARITY_ERROR, "); + if (bmac_status & CREG_STAT_RXSERR) + printk("RX_SBUS_ERROR, "); + } + + printk(" RESET\n"); + bigmac_init_hw(bp, true); +} + +/* BigMAC transmit complete service routines. */ +static void bigmac_tx(struct bigmac *bp) +{ + struct be_txd *txbase = &bp->bmac_block->be_txd[0]; + struct net_device *dev = bp->dev; + int elem; + + spin_lock(&bp->lock); + + elem = bp->tx_old; + DTX(("bigmac_tx: tx_old[%d] ", elem)); + while (elem != bp->tx_new) { + struct sk_buff *skb; + struct be_txd *this = &txbase[elem]; + + DTX(("this(%p) [flags(%08x)addr(%08x)]", + this, this->tx_flags, this->tx_addr)); + + if (this->tx_flags & TXD_OWN) + break; + skb = bp->tx_skbs[elem]; + dev->stats.tx_packets++; + dev->stats.tx_bytes += skb->len; + dma_unmap_single(&bp->bigmac_op->dev, + this->tx_addr, skb->len, + DMA_TO_DEVICE); + + DTX(("skb(%p) ", skb)); + bp->tx_skbs[elem] = NULL; + dev_consume_skb_irq(skb); + + elem = NEXT_TX(elem); + } + DTX((" DONE, tx_old=%d\n", elem)); + bp->tx_old = elem; + + if (netif_queue_stopped(dev) && + TX_BUFFS_AVAIL(bp) > 0) + netif_wake_queue(bp->dev); + + spin_unlock(&bp->lock); +} + +/* BigMAC receive complete service routines. */ +static void bigmac_rx(struct bigmac *bp) +{ + struct be_rxd *rxbase = &bp->bmac_block->be_rxd[0]; + struct be_rxd *this; + int elem = bp->rx_new, drops = 0; + u32 flags; + + this = &rxbase[elem]; + while (!((flags = this->rx_flags) & RXD_OWN)) { + struct sk_buff *skb; + int len = (flags & RXD_LENGTH); /* FCS not included */ + + /* Check for errors. */ + if (len < ETH_ZLEN) { + bp->dev->stats.rx_errors++; + bp->dev->stats.rx_length_errors++; + + drop_it: + /* Return it to the BigMAC. */ + bp->dev->stats.rx_dropped++; + this->rx_flags = + (RXD_OWN | ((RX_BUF_ALLOC_SIZE - 34) & RXD_LENGTH)); + goto next; + } + skb = bp->rx_skbs[elem]; + if (len > RX_COPY_THRESHOLD) { + struct sk_buff *new_skb; + + /* Now refill the entry, if we can. */ + new_skb = big_mac_alloc_skb(RX_BUF_ALLOC_SIZE, GFP_ATOMIC); + if (new_skb == NULL) { + drops++; + goto drop_it; + } + dma_unmap_single(&bp->bigmac_op->dev, + this->rx_addr, + RX_BUF_ALLOC_SIZE - 34, + DMA_FROM_DEVICE); + bp->rx_skbs[elem] = new_skb; + skb_put(new_skb, ETH_FRAME_LEN); + skb_reserve(new_skb, 34); + this->rx_addr = + dma_map_single(&bp->bigmac_op->dev, + new_skb->data, + RX_BUF_ALLOC_SIZE - 34, + DMA_FROM_DEVICE); + this->rx_flags = + (RXD_OWN | ((RX_BUF_ALLOC_SIZE - 34) & RXD_LENGTH)); + + /* Trim the original skb for the netif. */ + skb_trim(skb, len); + } else { + struct sk_buff *copy_skb = netdev_alloc_skb(bp->dev, len + 2); + + if (copy_skb == NULL) { + drops++; + goto drop_it; + } + skb_reserve(copy_skb, 2); + skb_put(copy_skb, len); + dma_sync_single_for_cpu(&bp->bigmac_op->dev, + this->rx_addr, len, + DMA_FROM_DEVICE); + skb_copy_to_linear_data(copy_skb, (unsigned char *)skb->data, len); + dma_sync_single_for_device(&bp->bigmac_op->dev, + this->rx_addr, len, + DMA_FROM_DEVICE); + + /* Reuse original ring buffer. */ + this->rx_flags = + (RXD_OWN | ((RX_BUF_ALLOC_SIZE - 34) & RXD_LENGTH)); + + skb = copy_skb; + } + + /* No checksums done by the BigMAC ;-( */ + skb->protocol = eth_type_trans(skb, bp->dev); + netif_rx(skb); + bp->dev->stats.rx_packets++; + bp->dev->stats.rx_bytes += len; + next: + elem = NEXT_RX(elem); + this = &rxbase[elem]; + } + bp->rx_new = elem; + if (drops) + printk(KERN_NOTICE "%s: Memory squeeze, deferring packet.\n", bp->dev->name); +} + +static irqreturn_t bigmac_interrupt(int irq, void *dev_id) +{ + struct bigmac *bp = (struct bigmac *) dev_id; + u32 qec_status, bmac_status; + + DIRQ(("bigmac_interrupt: ")); + + /* Latch status registers now. */ + bmac_status = sbus_readl(bp->creg + CREG_STAT); + qec_status = sbus_readl(bp->gregs + GLOB_STAT); + + DIRQ(("qec_status=%08x bmac_status=%08x\n", qec_status, bmac_status)); + if ((qec_status & (GLOB_STAT_ER | GLOB_STAT_BM)) || + (bmac_status & CREG_STAT_ERRORS)) + bigmac_is_medium_rare(bp, qec_status, bmac_status); + + if (bmac_status & CREG_STAT_TXIRQ) + bigmac_tx(bp); + + if (bmac_status & CREG_STAT_RXIRQ) + bigmac_rx(bp); + + return IRQ_HANDLED; +} + +static int bigmac_open(struct net_device *dev) +{ + struct bigmac *bp = netdev_priv(dev); + int ret; + + ret = request_irq(dev->irq, bigmac_interrupt, IRQF_SHARED, dev->name, bp); + if (ret) { + printk(KERN_ERR "BIGMAC: Can't order irq %d to go.\n", dev->irq); + return ret; + } + timer_setup(&bp->bigmac_timer, bigmac_timer, 0); + ret = bigmac_init_hw(bp, false); + if (ret) + free_irq(dev->irq, bp); + return ret; +} + +static int bigmac_close(struct net_device *dev) +{ + struct bigmac *bp = netdev_priv(dev); + + del_timer(&bp->bigmac_timer); + bp->timer_state = asleep; + bp->timer_ticks = 0; + + bigmac_stop(bp); + bigmac_clean_rings(bp); + free_irq(dev->irq, bp); + return 0; +} + +static void bigmac_tx_timeout(struct net_device *dev, unsigned int txqueue) +{ + struct bigmac *bp = netdev_priv(dev); + + bigmac_init_hw(bp, true); + netif_wake_queue(dev); +} + +/* Put a packet on the wire. */ +static netdev_tx_t +bigmac_start_xmit(struct sk_buff *skb, struct net_device *dev) +{ + struct bigmac *bp = netdev_priv(dev); + int len, entry; + u32 mapping; + + len = skb->len; + mapping = dma_map_single(&bp->bigmac_op->dev, skb->data, + len, DMA_TO_DEVICE); + + /* Avoid a race... */ + spin_lock_irq(&bp->lock); + entry = bp->tx_new; + DTX(("bigmac_start_xmit: len(%d) entry(%d)\n", len, entry)); + bp->bmac_block->be_txd[entry].tx_flags = TXD_UPDATE; + bp->tx_skbs[entry] = skb; + bp->bmac_block->be_txd[entry].tx_addr = mapping; + bp->bmac_block->be_txd[entry].tx_flags = + (TXD_OWN | TXD_SOP | TXD_EOP | (len & TXD_LENGTH)); + bp->tx_new = NEXT_TX(entry); + if (TX_BUFFS_AVAIL(bp) <= 0) + netif_stop_queue(dev); + spin_unlock_irq(&bp->lock); + + /* Get it going. */ + sbus_writel(CREG_CTRL_TWAKEUP, bp->creg + CREG_CTRL); + + + return NETDEV_TX_OK; +} + +static struct net_device_stats *bigmac_get_stats(struct net_device *dev) +{ + struct bigmac *bp = netdev_priv(dev); + + bigmac_get_counters(bp, bp->bregs); + return &dev->stats; +} + +static void bigmac_set_multicast(struct net_device *dev) +{ + struct bigmac *bp = netdev_priv(dev); + void __iomem *bregs = bp->bregs; + struct netdev_hw_addr *ha; + u32 tmp, crc; + + /* Disable the receiver. The bit self-clears when + * the operation is complete. + */ + tmp = sbus_readl(bregs + BMAC_RXCFG); + tmp &= ~(BIGMAC_RXCFG_ENABLE); + sbus_writel(tmp, bregs + BMAC_RXCFG); + while ((sbus_readl(bregs + BMAC_RXCFG) & BIGMAC_RXCFG_ENABLE) != 0) + udelay(20); + + if ((dev->flags & IFF_ALLMULTI) || (netdev_mc_count(dev) > 64)) { + sbus_writel(0xffff, bregs + BMAC_HTABLE0); + sbus_writel(0xffff, bregs + BMAC_HTABLE1); + sbus_writel(0xffff, bregs + BMAC_HTABLE2); + sbus_writel(0xffff, bregs + BMAC_HTABLE3); + } else if (dev->flags & IFF_PROMISC) { + tmp = sbus_readl(bregs + BMAC_RXCFG); + tmp |= BIGMAC_RXCFG_PMISC; + sbus_writel(tmp, bregs + BMAC_RXCFG); + } else { + u16 hash_table[4] = { 0 }; + + netdev_for_each_mc_addr(ha, dev) { + crc = ether_crc_le(6, ha->addr); + crc >>= 26; + hash_table[crc >> 4] |= 1 << (crc & 0xf); + } + sbus_writel(hash_table[0], bregs + BMAC_HTABLE0); + sbus_writel(hash_table[1], bregs + BMAC_HTABLE1); + sbus_writel(hash_table[2], bregs + BMAC_HTABLE2); + sbus_writel(hash_table[3], bregs + BMAC_HTABLE3); + } + + /* Re-enable the receiver. */ + tmp = sbus_readl(bregs + BMAC_RXCFG); + tmp |= BIGMAC_RXCFG_ENABLE; + sbus_writel(tmp, bregs + BMAC_RXCFG); +} + +/* Ethtool support... */ +static void bigmac_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info) +{ + strscpy(info->driver, "sunbmac", sizeof(info->driver)); + strscpy(info->version, "2.0", sizeof(info->version)); +} + +static u32 bigmac_get_link(struct net_device *dev) +{ + struct bigmac *bp = netdev_priv(dev); + + spin_lock_irq(&bp->lock); + bp->sw_bmsr = bigmac_tcvr_read(bp, bp->tregs, MII_BMSR); + spin_unlock_irq(&bp->lock); + + return (bp->sw_bmsr & BMSR_LSTATUS); +} + +static const struct ethtool_ops bigmac_ethtool_ops = { + .get_drvinfo = bigmac_get_drvinfo, + .get_link = bigmac_get_link, +}; + +static const struct net_device_ops bigmac_ops = { + .ndo_open = bigmac_open, + .ndo_stop = bigmac_close, + .ndo_start_xmit = bigmac_start_xmit, + .ndo_get_stats = bigmac_get_stats, + .ndo_set_rx_mode = bigmac_set_multicast, + .ndo_tx_timeout = bigmac_tx_timeout, + .ndo_set_mac_address = eth_mac_addr, + .ndo_validate_addr = eth_validate_addr, +}; + +static int bigmac_ether_init(struct platform_device *op, + struct platform_device *qec_op) +{ + static int version_printed; + struct net_device *dev; + u8 bsizes, bsizes_more; + struct bigmac *bp; + + /* Get a new device struct for this interface. */ + dev = alloc_etherdev(sizeof(struct bigmac)); + if (!dev) + return -ENOMEM; + + if (version_printed++ == 0) + printk(KERN_INFO "%s", version); + + eth_hw_addr_set(dev, idprom->id_ethaddr); + + /* Setup softc, with backpointers to QEC and BigMAC SBUS device structs. */ + bp = netdev_priv(dev); + bp->qec_op = qec_op; + bp->bigmac_op = op; + + SET_NETDEV_DEV(dev, &op->dev); + + spin_lock_init(&bp->lock); + + /* Map in QEC global control registers. */ + bp->gregs = of_ioremap(&qec_op->resource[0], 0, + GLOB_REG_SIZE, "BigMAC QEC GLobal Regs"); + if (!bp->gregs) { + printk(KERN_ERR "BIGMAC: Cannot map QEC global registers.\n"); + goto fail_and_cleanup; + } + + /* Make sure QEC is in BigMAC mode. */ + if ((sbus_readl(bp->gregs + GLOB_CTRL) & 0xf0000000) != GLOB_CTRL_BMODE) { + printk(KERN_ERR "BigMAC: AIEEE, QEC is not in BigMAC mode!\n"); + goto fail_and_cleanup; + } + + /* Reset the QEC. */ + if (qec_global_reset(bp->gregs)) + goto fail_and_cleanup; + + /* Get supported SBUS burst sizes. */ + bsizes = of_getintprop_default(qec_op->dev.of_node, "burst-sizes", 0xff); + bsizes_more = of_getintprop_default(qec_op->dev.of_node, "burst-sizes", 0xff); + + bsizes &= 0xff; + if (bsizes_more != 0xff) + bsizes &= bsizes_more; + if (bsizes == 0xff || (bsizes & DMA_BURST16) == 0 || + (bsizes & DMA_BURST32) == 0) + bsizes = (DMA_BURST32 - 1); + bp->bigmac_bursts = bsizes; + + /* Perform QEC initialization. */ + qec_init(bp); + + /* Map in the BigMAC channel registers. */ + bp->creg = of_ioremap(&op->resource[0], 0, + CREG_REG_SIZE, "BigMAC QEC Channel Regs"); + if (!bp->creg) { + printk(KERN_ERR "BIGMAC: Cannot map QEC channel registers.\n"); + goto fail_and_cleanup; + } + + /* Map in the BigMAC control registers. */ + bp->bregs = of_ioremap(&op->resource[1], 0, + BMAC_REG_SIZE, "BigMAC Primary Regs"); + if (!bp->bregs) { + printk(KERN_ERR "BIGMAC: Cannot map BigMAC primary registers.\n"); + goto fail_and_cleanup; + } + + /* Map in the BigMAC transceiver registers, this is how you poke at + * the BigMAC's PHY. + */ + bp->tregs = of_ioremap(&op->resource[2], 0, + TCVR_REG_SIZE, "BigMAC Transceiver Regs"); + if (!bp->tregs) { + printk(KERN_ERR "BIGMAC: Cannot map BigMAC transceiver registers.\n"); + goto fail_and_cleanup; + } + + /* Stop the BigMAC. */ + bigmac_stop(bp); + + /* Allocate transmit/receive descriptor DVMA block. */ + bp->bmac_block = dma_alloc_coherent(&bp->bigmac_op->dev, + PAGE_SIZE, + &bp->bblock_dvma, GFP_ATOMIC); + if (bp->bmac_block == NULL || bp->bblock_dvma == 0) + goto fail_and_cleanup; + + /* Get the board revision of this BigMAC. */ + bp->board_rev = of_getintprop_default(bp->bigmac_op->dev.of_node, + "board-version", 1); + + /* Init auto-negotiation timer state. */ + timer_setup(&bp->bigmac_timer, bigmac_timer, 0); + bp->timer_state = asleep; + bp->timer_ticks = 0; + + /* Backlink to generic net device struct. */ + bp->dev = dev; + + /* Set links to our BigMAC open and close routines. */ + dev->ethtool_ops = &bigmac_ethtool_ops; + dev->netdev_ops = &bigmac_ops; + dev->watchdog_timeo = 5*HZ; + + /* Finish net device registration. */ + dev->irq = bp->bigmac_op->archdata.irqs[0]; + dev->dma = 0; + + if (register_netdev(dev)) { + printk(KERN_ERR "BIGMAC: Cannot register device.\n"); + goto fail_and_cleanup; + } + + dev_set_drvdata(&bp->bigmac_op->dev, bp); + + printk(KERN_INFO "%s: BigMAC 100baseT Ethernet %pM\n", + dev->name, dev->dev_addr); + + return 0; + +fail_and_cleanup: + /* Something went wrong, undo whatever we did so far. */ + /* Free register mappings if any. */ + if (bp->gregs) + of_iounmap(&qec_op->resource[0], bp->gregs, GLOB_REG_SIZE); + if (bp->creg) + of_iounmap(&op->resource[0], bp->creg, CREG_REG_SIZE); + if (bp->bregs) + of_iounmap(&op->resource[1], bp->bregs, BMAC_REG_SIZE); + if (bp->tregs) + of_iounmap(&op->resource[2], bp->tregs, TCVR_REG_SIZE); + + if (bp->bmac_block) + dma_free_coherent(&bp->bigmac_op->dev, + PAGE_SIZE, + bp->bmac_block, + bp->bblock_dvma); + + /* This also frees the co-located private data */ + free_netdev(dev); + return -ENODEV; +} + +/* QEC can be the parent of either QuadEthernet or a BigMAC. We want + * the latter. + */ +static int bigmac_sbus_probe(struct platform_device *op) +{ + struct device *parent = op->dev.parent; + struct platform_device *qec_op; + + qec_op = to_platform_device(parent); + + return bigmac_ether_init(op, qec_op); +} + +static int bigmac_sbus_remove(struct platform_device *op) +{ + struct bigmac *bp = platform_get_drvdata(op); + struct device *parent = op->dev.parent; + struct net_device *net_dev = bp->dev; + struct platform_device *qec_op; + + qec_op = to_platform_device(parent); + + unregister_netdev(net_dev); + + of_iounmap(&qec_op->resource[0], bp->gregs, GLOB_REG_SIZE); + of_iounmap(&op->resource[0], bp->creg, CREG_REG_SIZE); + of_iounmap(&op->resource[1], bp->bregs, BMAC_REG_SIZE); + of_iounmap(&op->resource[2], bp->tregs, TCVR_REG_SIZE); + dma_free_coherent(&op->dev, + PAGE_SIZE, + bp->bmac_block, + bp->bblock_dvma); + + free_netdev(net_dev); + + return 0; +} + +static const struct of_device_id bigmac_sbus_match[] = { + { + .name = "be", + }, + {}, +}; + +MODULE_DEVICE_TABLE(of, bigmac_sbus_match); + +static struct platform_driver bigmac_sbus_driver = { + .driver = { + .name = "sunbmac", + .of_match_table = bigmac_sbus_match, + }, + .probe = bigmac_sbus_probe, + .remove = bigmac_sbus_remove, +}; + +module_platform_driver(bigmac_sbus_driver); |