diff options
Diffstat (limited to 'target/linux/adm5120/files/drivers/net/adm5120sw.c')
| -rw-r--r-- | target/linux/adm5120/files/drivers/net/adm5120sw.c | 1203 |
1 files changed, 1203 insertions, 0 deletions
diff --git a/target/linux/adm5120/files/drivers/net/adm5120sw.c b/target/linux/adm5120/files/drivers/net/adm5120sw.c new file mode 100644 index 0000000000..7acc84d248 --- /dev/null +++ b/target/linux/adm5120/files/drivers/net/adm5120sw.c @@ -0,0 +1,1203 @@ +/* + * ADM5120 built-in ethernet switch driver + * + * Copyright (C) 2007-2008 Gabor Juhos <juhosg@openwrt.org> + * + * This code was based on a driver for Linux 2.6.xx by Jeroen Vreeken. + * Copyright Jeroen Vreeken (pe1rxq@amsat.org), 2005 + * NAPI extension for the Jeroen's driver + * Copyright Thomas Langer (Thomas.Langer@infineon.com), 2007 + * Copyright Friedrich Beckmann (Friedrich.Beckmann@infineon.com), 2007 + * Inspiration for the Jeroen's driver came from the ADMtek 2.4 driver. + * Copyright ADMtek Inc. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 as published + * by the Free Software Foundation. + * + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/errno.h> +#include <linux/interrupt.h> +#include <linux/ioport.h> +#include <linux/spinlock.h> +#include <linux/platform_device.h> +#include <linux/io.h> +#include <linux/irq.h> + +#include <linux/netdevice.h> +#include <linux/etherdevice.h> +#include <linux/skbuff.h> + +#include <asm/mipsregs.h> + +#include <asm/mach-adm5120/adm5120_info.h> +#include <asm/mach-adm5120/adm5120_defs.h> +#include <asm/mach-adm5120/adm5120_switch.h> + +#include "adm5120sw.h" + +#define DRV_NAME "adm5120-switch" +#define DRV_DESC "ADM5120 built-in ethernet switch driver" +#define DRV_VERSION "0.1.1" + +#define CONFIG_ADM5120_SWITCH_NAPI 1 +#undef CONFIG_ADM5120_SWITCH_DEBUG + +/* ------------------------------------------------------------------------ */ + +#ifdef CONFIG_ADM5120_SWITCH_DEBUG +#define SW_DBG(f, a...) printk(KERN_DBG "%s: " f, DRV_NAME , ## a) +#else +#define SW_DBG(f, a...) do {} while (0) +#endif +#define SW_ERR(f, a...) printk(KERN_ERR "%s: " f, DRV_NAME , ## a) +#define SW_INFO(f, a...) printk(KERN_INFO "%s: " f, DRV_NAME , ## a) + +#define SWITCH_NUM_PORTS 6 +#define ETH_CSUM_LEN 4 + +#define RX_MAX_PKTLEN 1550 +#define RX_RING_SIZE 64 + +#define TX_RING_SIZE 32 +#define TX_QUEUE_LEN 28 /* Limit ring entries actually used. */ +#define TX_TIMEOUT HZ*400 + +#define RX_DESCS_SIZE (RX_RING_SIZE * sizeof(struct dma_desc *)) +#define RX_SKBS_SIZE (RX_RING_SIZE * sizeof(struct sk_buff *)) +#define TX_DESCS_SIZE (TX_RING_SIZE * sizeof(struct dma_desc *)) +#define TX_SKBS_SIZE (TX_RING_SIZE * sizeof(struct sk_buff *)) + +#define SKB_ALLOC_LEN (RX_MAX_PKTLEN + 32) +#define SKB_RESERVE_LEN (NET_IP_ALIGN + NET_SKB_PAD) + +#define SWITCH_INTS_HIGH (SWITCH_INT_SHD | SWITCH_INT_RHD | SWITCH_INT_HDF) +#define SWITCH_INTS_LOW (SWITCH_INT_SLD | SWITCH_INT_RLD | SWITCH_INT_LDF) +#define SWITCH_INTS_ERR (SWITCH_INT_RDE | SWITCH_INT_SDE | SWITCH_INT_CPUH) +#define SWITCH_INTS_Q (SWITCH_INT_P0QF | SWITCH_INT_P1QF | SWITCH_INT_P2QF | \ + SWITCH_INT_P3QF | SWITCH_INT_P4QF | SWITCH_INT_P5QF | \ + SWITCH_INT_CPQF | SWITCH_INT_GQF) + +#define SWITCH_INTS_ALL (SWITCH_INTS_HIGH | SWITCH_INTS_LOW | \ + SWITCH_INTS_ERR | SWITCH_INTS_Q | \ + SWITCH_INT_MD | SWITCH_INT_PSC) + +#define SWITCH_INTS_USED (SWITCH_INTS_LOW | SWITCH_INT_PSC) +#define SWITCH_INTS_POLL (SWITCH_INT_RLD | SWITCH_INT_LDF | SWITCH_INT_SLD) + +/* ------------------------------------------------------------------------ */ + +struct adm5120_if_priv { + struct net_device *dev; + + unsigned int vlan_no; + unsigned int port_mask; + +#ifdef CONFIG_ADM5120_SWITCH_NAPI + struct napi_struct napi; +#endif +}; + +struct dma_desc { + __u32 buf1; +#define DESC_OWN (1UL << 31) /* Owned by the switch */ +#define DESC_EOR (1UL << 28) /* End of Ring */ +#define DESC_ADDR_MASK 0x1FFFFFF +#define DESC_ADDR(x) ((__u32)(x) & DESC_ADDR_MASK) + __u32 buf2; +#define DESC_BUF2_EN (1UL << 31) /* Buffer 2 enable */ + __u32 buflen; + __u32 misc; +/* definitions for tx/rx descriptors */ +#define DESC_PKTLEN_SHIFT 16 +#define DESC_PKTLEN_MASK 0x7FF +/* tx descriptor specific part */ +#define DESC_CSUM (1UL << 31) /* Append checksum */ +#define DESC_DSTPORT_SHIFT 8 +#define DESC_DSTPORT_MASK 0x3F +#define DESC_VLAN_MASK 0x3F +/* rx descriptor specific part */ +#define DESC_SRCPORT_SHIFT 12 +#define DESC_SRCPORT_MASK 0x7 +#define DESC_DA_MASK 0x3 +#define DESC_DA_SHIFT 4 +#define DESC_IPCSUM_FAIL (1UL << 3) /* IP checksum fail */ +#define DESC_VLAN_TAG (1UL << 2) /* VLAN tag present */ +#define DESC_TYPE_MASK 0x3 /* mask for Packet type */ +#define DESC_TYPE_IP 0x0 /* IP packet */ +#define DESC_TYPE_PPPoE 0x1 /* PPPoE packet */ +} __attribute__ ((aligned(16))); + +/* ------------------------------------------------------------------------ */ + +static int adm5120_nrdevs; + +static struct net_device *adm5120_devs[SWITCH_NUM_PORTS]; +/* Lookup table port -> device */ +static struct net_device *adm5120_port[SWITCH_NUM_PORTS]; + +static struct dma_desc *txl_descs; +static struct dma_desc *rxl_descs; + +static dma_addr_t txl_descs_dma; +static dma_addr_t rxl_descs_dma; + +static struct sk_buff **txl_skbuff; +static struct sk_buff **rxl_skbuff; + +static unsigned int cur_rxl, dirty_rxl; /* producer/consumer ring indices */ +static unsigned int cur_txl, dirty_txl; + +static unsigned int sw_used; + +static spinlock_t tx_lock = SPIN_LOCK_UNLOCKED; + +/* ------------------------------------------------------------------------ */ + +static inline u32 sw_read_reg(u32 reg) +{ + return __raw_readl((void __iomem *)KSEG1ADDR(ADM5120_SWITCH_BASE)+reg); +} + +static inline void sw_write_reg(u32 reg, u32 val) +{ + __raw_writel(val, (void __iomem *)KSEG1ADDR(ADM5120_SWITCH_BASE)+reg); +} + +static inline void sw_int_mask(u32 mask) +{ + u32 t; + + t = sw_read_reg(SWITCH_REG_INT_MASK); + t |= mask; + sw_write_reg(SWITCH_REG_INT_MASK, t); +} + +static inline void sw_int_unmask(u32 mask) +{ + u32 t; + + t = sw_read_reg(SWITCH_REG_INT_MASK); + t &= ~mask; + sw_write_reg(SWITCH_REG_INT_MASK, t); +} + +static inline void sw_int_ack(u32 mask) +{ + sw_write_reg(SWITCH_REG_INT_STATUS, mask); +} + +static inline u32 sw_int_status(void) +{ + u32 t; + + t = sw_read_reg(SWITCH_REG_INT_STATUS); + t &= ~sw_read_reg(SWITCH_REG_INT_MASK); + return t; +} + +static inline u32 desc_get_srcport(struct dma_desc *desc) +{ + return (desc->misc >> DESC_SRCPORT_SHIFT) & DESC_SRCPORT_MASK; +} + +static inline u32 desc_get_pktlen(struct dma_desc *desc) +{ + return (desc->misc >> DESC_PKTLEN_SHIFT) & DESC_PKTLEN_MASK; +} + +static inline int desc_ipcsum_fail(struct dma_desc *desc) +{ + return ((desc->misc & DESC_IPCSUM_FAIL) != 0); +} + +/* ------------------------------------------------------------------------ */ + +static void sw_dump_desc(char *label, struct dma_desc *desc, int tx) +{ + u32 t; + + SW_DBG("%s %s desc/%p\n", label, tx ? "tx" : "rx", desc); + + t = desc->buf1; + SW_DBG(" buf1 %08X addr=%08X; len=%08X %s%s\n", t, + t & DESC_ADDR_MASK, + desc->buflen, + (t & DESC_OWN) ? "SWITCH" : "CPU", + (t & DESC_EOR) ? " RE" : ""); + + t = desc->buf2; + SW_DBG(" buf2 %08X addr=%08X%s\n", desc->buf2, + t & DESC_ADDR_MASK, + (t & DESC_BUF2_EN) ? " EN" : "" ); + + t = desc->misc; + if (tx) + SW_DBG(" misc %08X%s pktlen=%04X ports=%02X vlan=%02X\n", t, + (t & DESC_CSUM) ? " CSUM" : "", + (t >> DESC_PKTLEN_SHIFT) & DESC_PKTLEN_MASK, + (t >> DESC_DSTPORT_SHIFT) & DESC_DSTPORT_MASK, + t & DESC_VLAN_MASK); + else + SW_DBG(" misc %08X pktlen=%04X port=%d DA=%d%s%s type=%d\n", + t, + (t >> DESC_PKTLEN_SHIFT) & DESC_PKTLEN_MASK, + (t >> DESC_SRCPORT_SHIFT) & DESC_SRCPORT_MASK, + (t >> DESC_DA_SHIFT) & DESC_DA_MASK, + (t & DESC_IPCSUM_FAIL) ? " IPCF" : "", + (t & DESC_VLAN_TAG) ? " VLAN" : "", + (t & DESC_TYPE_MASK)); +} + +static void sw_dump_intr_mask(char *label, u32 mask) +{ + SW_DBG("%s %08X%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s\n", + label, mask, + (mask & SWITCH_INT_SHD) ? " SHD" : "", + (mask & SWITCH_INT_SLD) ? " SLD" : "", + (mask & SWITCH_INT_RHD) ? " RHD" : "", + (mask & SWITCH_INT_RLD) ? " RLD" : "", + (mask & SWITCH_INT_HDF) ? " HDF" : "", + (mask & SWITCH_INT_LDF) ? " LDF" : "", + (mask & SWITCH_INT_P0QF) ? " P0QF" : "", + (mask & SWITCH_INT_P1QF) ? " P1QF" : "", + (mask & SWITCH_INT_P2QF) ? " P2QF" : "", + (mask & SWITCH_INT_P3QF) ? " P3QF" : "", + (mask & SWITCH_INT_P4QF) ? " P4QF" : "", + (mask & SWITCH_INT_CPQF) ? " CPQF" : "", + (mask & SWITCH_INT_GQF) ? " GQF" : "", + (mask & SWITCH_INT_MD) ? " MD" : "", + (mask & SWITCH_INT_BCS) ? " BCS" : "", + (mask & SWITCH_INT_PSC) ? " PSC" : "", + (mask & SWITCH_INT_ID) ? " ID" : "", + (mask & SWITCH_INT_W0TE) ? " W0TE" : "", + (mask & SWITCH_INT_W1TE) ? " W1TE" : "", + (mask & SWITCH_INT_RDE) ? " RDE" : "", + (mask & SWITCH_INT_SDE) ? " SDE" : "", + (mask & SWITCH_INT_CPUH) ? " CPUH" : ""); +} + +static void sw_dump_regs(void) +{ + u32 t; + + t = sw_read_reg(SWITCH_REG_PHY_STATUS); + SW_DBG("phy_status: %08X\n", t); + + t = sw_read_reg(SWITCH_REG_CPUP_CONF); + SW_DBG("cpup_conf: %08X%s%s%s\n", t, + (t & CPUP_CONF_DCPUP) ? " DCPUP" : "", + (t & CPUP_CONF_CRCP) ? " CRCP" : "", + (t & CPUP_CONF_BTM) ? " BTM" : ""); + + t = sw_read_reg(SWITCH_REG_PORT_CONF0); + SW_DBG("port_conf0: %08X\n", t); + t = sw_read_reg(SWITCH_REG_PORT_CONF1); + SW_DBG("port_conf1: %08X\n", t); + t = sw_read_reg(SWITCH_REG_PORT_CONF2); + SW_DBG("port_conf2: %08X\n", t); + + t = sw_read_reg(SWITCH_REG_VLAN_G1); + SW_DBG("vlan g1: %08X\n", t); + t = sw_read_reg(SWITCH_REG_VLAN_G2); + SW_DBG("vlan g2: %08X\n", t); + + t = sw_read_reg(SWITCH_REG_BW_CNTL0); + SW_DBG("bw_cntl0: %08X\n", t); + t = sw_read_reg(SWITCH_REG_BW_CNTL1); + SW_DBG("bw_cntl1: %08X\n", t); + + t = sw_read_reg(SWITCH_REG_PHY_CNTL0); + SW_DBG("phy_cntl0: %08X\n", t); + t = sw_read_reg(SWITCH_REG_PHY_CNTL1); + SW_DBG("phy_cntl1: %08X\n", t); + t = sw_read_reg(SWITCH_REG_PHY_CNTL2); + SW_DBG("phy_cntl2: %08X\n", t); + t = sw_read_reg(SWITCH_REG_PHY_CNTL3); + SW_DBG("phy_cntl3: %08X\n", t); + t = sw_read_reg(SWITCH_REG_PHY_CNTL4); + SW_DBG("phy_cntl4: %08X\n", t); + + t = sw_read_reg(SWITCH_REG_INT_STATUS); + sw_dump_intr_mask("int_status: ", t); + + t = sw_read_reg(SWITCH_REG_INT_MASK); + sw_dump_intr_mask("int_mask: ", t); + + t = sw_read_reg(SWITCH_REG_SHDA); + SW_DBG("shda: %08X\n", t); + t = sw_read_reg(SWITCH_REG_SLDA); + SW_DBG("slda: %08X\n", t); + t = sw_read_reg(SWITCH_REG_RHDA); + SW_DBG("rhda: %08X\n", t); + t = sw_read_reg(SWITCH_REG_RLDA); + SW_DBG("rlda: %08X\n", t); +} + +/* ------------------------------------------------------------------------ */ + +static inline void adm5120_rx_dma_update(struct dma_desc *desc, + struct sk_buff *skb, int end) +{ + desc->misc = 0; + desc->buf2 = 0; + desc->buflen = RX_MAX_PKTLEN; + desc->buf1 = DESC_ADDR(skb->data) | + DESC_OWN | (end ? DESC_EOR : 0); +} + +static void adm5120_switch_rx_refill(void) +{ + unsigned int entry; + + for (; cur_rxl - dirty_rxl > 0; dirty_rxl++) { + struct dma_desc *desc; + struct sk_buff *skb; + + entry = dirty_rxl % RX_RING_SIZE; + desc = &rxl_descs[entry]; + + skb = rxl_skbuff[entry]; + if (skb == NULL) { + skb = alloc_skb(SKB_ALLOC_LEN, GFP_ATOMIC); + if (skb) { + skb_reserve(skb, SKB_RESERVE_LEN); + rxl_skbuff[entry] = skb; + } else { + SW_ERR("no memory for skb\n"); + desc->buflen = 0; + desc->buf2 = 0; + desc->misc = 0; + desc->buf1 = (desc->buf1 & DESC_EOR) | DESC_OWN; + break; + } + } + + desc->buf2 = 0; + desc->buflen = RX_MAX_PKTLEN; + desc->misc = 0; + desc->buf1 = (desc->buf1 & DESC_EOR) | DESC_OWN | + DESC_ADDR(skb->data); + } +} + +static int adm5120_switch_rx(int limit) +{ + unsigned int done = 0; + + SW_DBG("rx start, limit=%d, cur_rxl=%u, dirty_rxl=%u\n", + limit, cur_rxl, dirty_rxl); + + while (done < limit) { + int entry = cur_rxl % RX_RING_SIZE; + struct dma_desc *desc = &rxl_descs[entry]; + struct net_device *rdev; + unsigned int port; + + if (desc->buf1 & DESC_OWN) + break; + + if (dirty_rxl + RX_RING_SIZE == cur_rxl) + break; + + port = desc_get_srcport(desc); + rdev = adm5120_port[port]; + + SW_DBG("rx descriptor %u, desc=%p, skb=%p\n", entry, desc, + rxl_skbuff[entry]); + + if ((rdev) && netif_running(rdev)) { + struct sk_buff *skb = rxl_skbuff[entry]; + int pktlen; + + pktlen = desc_get_pktlen(desc); + pktlen -= ETH_CSUM_LEN; + + if ((pktlen == 0) || desc_ipcsum_fail(desc)) { + rdev->stats.rx_errors++; + if (pktlen == 0) + rdev->stats.rx_length_errors++; + if (desc_ipcsum_fail(desc)) + rdev->stats.rx_crc_errors++; + SW_DBG("rx error, recycling skb %u\n", entry); + } else { + skb_put(skb, pktlen); + + skb->dev = rdev; + skb->protocol = eth_type_trans(skb, rdev); + skb->ip_summed = CHECKSUM_UNNECESSARY; + + dma_cache_wback_inv((unsigned long)skb->data, + skb->len); + +#ifdef CONFIG_ADM5120_SWITCH_NAPI + netif_receive_skb(skb); +#else + netif_rx(skb); +#endif + + rdev->last_rx = jiffies; + rdev->stats.rx_packets++; + rdev->stats.rx_bytes += pktlen; + + rxl_skbuff[entry] = NULL; + done++; + } + } else { + SW_DBG("no rx device, recycling skb %u\n", entry); + } + + cur_rxl++; + if (cur_rxl - dirty_rxl > RX_RING_SIZE / 4) + adm5120_switch_rx_refill(); + } + + adm5120_switch_rx_refill(); + + SW_DBG("rx finished, cur_rxl=%u, dirty_rxl=%u, processed %d\n", + cur_rxl, dirty_rxl, done); + + return done; +} + +static void adm5120_switch_tx(void) +{ + unsigned int entry; + + spin_lock(&tx_lock); + entry = dirty_txl % TX_RING_SIZE; + while (dirty_txl != cur_txl) { + struct dma_desc *desc = &txl_descs[entry]; + struct sk_buff *skb = txl_skbuff[entry]; + + if (desc->buf1 & DESC_OWN) + break; + + if (netif_running(skb->dev)) { + skb->dev->stats.tx_bytes += skb->len; + skb->dev->stats.tx_packets++; + } + + dev_kfree_skb_irq(skb); + txl_skbuff[entry] = NULL; + entry = (++dirty_txl) % TX_RING_SIZE; + } + + if ((cur_txl - dirty_txl) < TX_QUEUE_LEN - 4) { + int i; + for (i = 0; i < SWITCH_NUM_PORTS; i++) { + if (!adm5120_devs[i]) + continue; + netif_wake_queue(adm5120_devs[i]); + } + } + spin_unlock(&tx_lock); +} + +#ifdef CONFIG_ADM5120_SWITCH_NAPI +static int adm5120_if_poll(struct napi_struct *napi, int limit) +{ + struct adm5120_if_priv *priv = container_of(napi, + struct adm5120_if_priv, napi); + struct net_device *dev = priv->dev; + int done; + u32 status; + + sw_int_ack(SWITCH_INTS_POLL); + + SW_DBG("%s: processing TX ring\n", dev->name); + adm5120_switch_tx(); + + SW_DBG("%s: processing RX ring\n", dev->name); + done = adm5120_switch_rx(limit); + + status = sw_int_status() & SWITCH_INTS_POLL; + if ((done < limit) && (!status)) { + SW_DBG("disable polling mode for %s\n", dev->name); + netif_rx_complete(dev, napi); + sw_int_unmask(SWITCH_INTS_POLL); + return 0; + } + + SW_DBG("%s still in polling mode, done=%d, status=%x\n", + dev->name, done, status); + return 1; +} +#endif /* CONFIG_ADM5120_SWITCH_NAPI */ + + +static irqreturn_t adm5120_switch_irq(int irq, void *dev_id) +{ + u32 status; + + status = sw_int_status(); + status &= SWITCH_INTS_ALL; + if (!status) + return IRQ_NONE; + +#ifdef CONFIG_ADM5120_SWITCH_NAPI + sw_int_ack(status & ~SWITCH_INTS_POLL); + + if (status & SWITCH_INTS_POLL) { + struct net_device *dev = dev_id; + struct adm5120_if_priv *priv = netdev_priv(dev); + + sw_dump_intr_mask("poll ints", status); + SW_DBG("enable polling mode for %s\n", dev->name); + sw_int_mask(SWITCH_INTS_POLL); + netif_rx_schedule(dev, &priv->napi); + } +#else + sw_int_ack(status); + + if (status & (SWITCH_INT_RLD | SWITCH_INT_LDF)) { + adm5120_switch_rx(RX_RING_SIZE); + } + + if (status & SWITCH_INT_SLD) { + adm5120_switch_tx(); + } +#endif + + return IRQ_HANDLED; +} + +static void adm5120_set_bw(char *matrix) +{ + unsigned long val; + + /* Port 0 to 3 are set using the bandwidth control 0 register */ + val = matrix[0] + (matrix[1]<<8) + (matrix[2]<<16) + (matrix[3]<<24); + sw_write_reg(SWITCH_REG_BW_CNTL0, val); + + /* Port 4 and 5 are set using the bandwidth control 1 register */ + val = matrix[4]; + if (matrix[5] == 1) + sw_write_reg(SWITCH_REG_BW_CNTL1, val | 0x80000000); + else + sw_write_reg(SWITCH_REG_BW_CNTL1, val & ~0x8000000); + + SW_DBG("D: ctl0 0x%ux, ctl1 0x%ux\n", sw_read_reg(SWITCH_REG_BW_CNTL0), + sw_read_reg(SWITCH_REG_BW_CNTL1)); +} + +static void adm5120_switch_tx_ring_reset(struct dma_desc *desc, + struct sk_buff **skbl, int num) +{ + memset(desc, 0, num * sizeof(*desc)); + desc[num-1].buf1 |= DESC_EOR; + memset(skbl, 0, sizeof(struct skb*)*num); + + cur_txl = 0; + dirty_txl = 0; +} + +static void adm5120_switch_rx_ring_reset(struct dma_desc *desc, + struct sk_buff **skbl, int num) +{ + int i; + + memset(desc, 0, num * sizeof(*desc)); + for (i = 0; i < num; i++) { + skbl[i] = dev_alloc_skb(SKB_ALLOC_LEN); + if (!skbl[i]) { + i = num; + break; + } + skb_reserve(skbl[i], SKB_RESERVE_LEN); + adm5120_rx_dma_update(&desc[i], skbl[i], (num-1==i)); + } + + cur_rxl = 0; + dirty_rxl = 0; +} + +static int adm5120_switch_tx_ring_alloc(void) +{ + int err; + + txl_descs = dma_alloc_coherent(NULL, TX_DESCS_SIZE, &txl_descs_dma, + GFP_ATOMIC); + if (!txl_descs) { + err = -ENOMEM; + goto err; + } + + txl_skbuff = kzalloc(TX_SKBS_SIZE, GFP_KERNEL); + if (!txl_skbuff) { + err = -ENOMEM; + goto err; + } + + return 0; + +err: + return err; +} + +static void adm5120_switch_tx_ring_free(void) +{ + int i; + + if (txl_skbuff) { + for (i = 0; i < TX_RING_SIZE; i++) + if (txl_skbuff[i]) + kfree_skb(txl_skbuff[i]); + kfree(txl_skbuff); + } + + if (txl_descs) + dma_free_coherent(NULL, TX_DESCS_SIZE, txl_descs, + txl_descs_dma); +} + +static int adm5120_switch_rx_ring_alloc(void) +{ + int err; + int i; + + /* init RX ring */ + rxl_descs = dma_alloc_coherent(NULL, RX_DESCS_SIZE, &rxl_descs_dma, + GFP_ATOMIC); + if (!rxl_descs) { + err = -ENOMEM; + goto err; + } + + rxl_skbuff = kzalloc(RX_SKBS_SIZE, GFP_KERNEL); + if (!rxl_skbuff) { + err = -ENOMEM; + goto err; + } + + for (i = 0; i < RX_RING_SIZE; i++) { + struct sk_buff *skb; + skb = alloc_skb(SKB_ALLOC_LEN, GFP_ATOMIC); + if (!skb) { + err = -ENOMEM; + goto err; + } + rxl_skbuff[i] = skb; + skb_reserve(skb, SKB_RESERVE_LEN); + } + + return 0; + +err: + return err; +} + +static void adm5120_switch_rx_ring_free(void) +{ + int i; + + if (rxl_skbuff) { + for (i = 0; i < RX_RING_SIZE; i++) + if (rxl_skbuff[i]) + kfree_skb(rxl_skbuff[i]); + kfree(rxl_skbuff); + } + + if (rxl_descs) + dma_free_coherent(NULL, RX_DESCS_SIZE, rxl_descs, + rxl_descs_dma); +} + +static void adm5120_write_mac(struct net_device *dev) +{ + struct adm5120_if_priv *priv = netdev_priv(dev); + unsigned char *mac = dev->dev_addr; + u32 t; + + t = mac[2] | (mac[3] << MAC_WT1_MAC3_SHIFT) | + (mac[4] << MAC_WT1_MAC4_SHIFT) | (mac[5] << MAC_WT1_MAC5_SHIFT); + sw_write_reg(SWITCH_REG_MAC_WT1, t); + + t = (mac[0] << MAC_WT0_MAC0_SHIFT) | (mac[1] << MAC_WT0_MAC1_SHIFT) | + MAC_WT0_MAWC | MAC_WT0_WVE | (priv->vlan_no<<3); + + sw_write_reg(SWITCH_REG_MAC_WT0, t); + + while (!(sw_read_reg(SWITCH_REG_MAC_WT0) & MAC_WT0_MWD)); +} + +static void adm5120_set_vlan(char *matrix) +{ + unsigned long val; + int vlan_port, port; + + val = matrix[0] + (matrix[1]<<8) + (matrix[2]<<16) + (matrix[3]<<24); + sw_write_reg(SWITCH_REG_VLAN_G1, val); + val = matrix[4] + (matrix[5]<<8); + sw_write_reg(SWITCH_REG_VLAN_G2, val); + + /* Now set/update the port vs. device lookup table */ + for (port=0; port<SWITCH_NUM_PORTS; port++) { + for (vlan_port=0; vlan_port<SWITCH_NUM_PORTS && !(matrix[vlan_port] & (0x00000001 << port)); vlan_port++); + if (vlan_port <SWITCH_NUM_PORTS) + adm5120_port[port] = adm5120_devs[vlan_port]; + else + adm5120_port[port] = NULL; + } +} + +static void adm5120_switch_set_vlan_mac(unsigned int vlan, unsigned char *mac) +{ + u32 t; + + t = mac[2] | (mac[3] << MAC_WT1_MAC3_SHIFT) + | (mac[4] << MAC_WT1_MAC4_SHIFT) + | (mac[5] << MAC_WT1_MAC5_SHIFT); + sw_write_reg(SWITCH_REG_MAC_WT1, t); + + t = (mac[0] << MAC_WT0_MAC0_SHIFT) | (mac[1] << MAC_WT0_MAC1_SHIFT) | + MAC_WT0_MAWC | MAC_WT0_WVE | (vlan << MAC_WT0_WVN_SHIFT) | + (MAC_WT0_WAF_STATIC << MAC_WT0_WAF_SHIFT); + sw_write_reg(SWITCH_REG_MAC_WT0, t); + + do { + t = sw_read_reg(SWITCH_REG_MAC_WT0); + } while ((t & MAC_WT0_MWD) == 0); +} + +static void adm5120_switch_set_vlan_ports(unsigned int vlan, u32 ports) +{ + unsigned int reg; + u32 t; + + if (vlan < 4) + reg = SWITCH_REG_VLAN_G1; + else { + vlan -= 4; + reg = SWITCH_REG_VLAN_G2; + } + + t = sw_read_reg(reg); + t &= ~(0xFF << (vlan*8)); + t |= (ports << (vlan*8)); + sw_write_reg(reg, t); +} + +/* ------------------------------------------------------------------------ */ + +#ifdef CONFIG_ADM5120_SWITCH_NAPI +static inline void adm5120_if_napi_enable(struct net_device *dev) +{ + struct adm5120_if_priv *priv = netdev_priv(dev); + napi_enable(&priv->napi); +} + +static inline void adm5120_if_napi_disable(struct net_device *dev) +{ + struct adm5120_if_priv *priv = netdev_priv(dev); + napi_disable(&priv->napi); +} +#else +static inline void adm5120_if_napi_enable(struct net_device *dev) {} +static inline void adm5120_if_napi_disable(struct net_device *dev) {} +#endif /* CONFIG_ADM5120_SWITCH_NAPI */ + +static int adm5120_if_open(struct net_device *dev) +{ + u32 t; + int err; + int i; + + adm5120_if_napi_enable(dev); + + err = request_irq(dev->irq, adm5120_switch_irq, + (IRQF_SHARED | IRQF_DISABLED), dev->name, dev); + if (err) { + SW_ERR("unable to get irq for %s\n", dev->name); + goto err; + } + + if (!sw_used++) + /* enable interrupts on first open */ + sw_int_unmask(SWITCH_INTS_USED); + + /* enable (additional) port */ + t = sw_read_reg(SWITCH_REG_PORT_CONF0); + for (i = 0; i < SWITCH_NUM_PORTS; i++) { + if (dev == adm5120_devs[i]) + t &= ~adm5120_eth_vlans[i]; + } + sw_write_reg(SWITCH_REG_PORT_CONF0, t); + + netif_start_queue(dev); + + return 0; + +err: + adm5120_if_napi_disable(dev); + return err; +} + +static int adm5120_if_stop(struct net_device *dev) +{ + u32 t; + int i; + + netif_stop_queue(dev); + adm5120_if_napi_disable(dev); + + /* disable port if not assigned to other devices */ + t = sw_read_reg(SWITCH_REG_PORT_CONF0); + t |= SWITCH_PORTS_NOCPU; + for (i = 0; i < SWITCH_NUM_PORTS; i++) { + if ((dev != adm5120_devs[i]) && netif_running(adm5120_devs[i])) + t &= ~adm5120_eth_vlans[i]; + } + sw_write_reg(SWITCH_REG_PORT_CONF0, t); + + if (!--sw_used) + sw_int_mask(SWITCH_INTS_USED); + + free_irq(dev->irq, dev); + + return 0; +} + +static int adm5120_if_hard_start_xmit(struct sk_buff *skb, + struct net_device *dev) +{ + struct dma_desc *desc; + struct adm5120_if_priv *priv = netdev_priv(dev); + unsigned int entry; + unsigned long data; + int i; + + /* lock switch irq */ + spin_lock_irq(&tx_lock); + + /* calculate the next TX descriptor entry. */ + entry = cur_txl % TX_RING_SIZE; + + desc = &txl_descs[entry]; + if (desc->buf1 & DESC_OWN) { + /* We want to write a packet but the TX queue is still + * occupied by the DMA. We are faster than the DMA... */ + SW_DBG("%s unable to transmit, packet dopped\n", dev->name); + dev_kfree_skb(skb); + dev->stats.tx_dropped++; + return 0; + } + + txl_skbuff[entry] = skb; + data = (desc->buf1 & DESC_EOR); + data |= DESC_ADDR(skb->data); + + desc->misc = + ((skb->len<ETH_ZLEN?ETH_ZLEN:skb->len) << DESC_PKTLEN_SHIFT) | + (0x1 << priv->vlan_no); + + desc->buflen = skb->len < ETH_ZLEN ? ETH_ZLEN : skb->len; + + desc->buf1 = data | DESC_OWN; + sw_write_reg(SWITCH_REG_SEND_TRIG, SEND_TRIG_STL); + + cur_txl++; + if (cur_txl == dirty_txl + TX_QUEUE_LEN) { + for (i = 0; i < SWITCH_NUM_PORTS; i++) { + if (!adm5120_devs[i]) + continue; + netif_stop_queue(adm5120_devs[i]); + } + } + + dev->trans_start = jiffies; + + spin_unlock_irq(&tx_lock); + + return 0; +} + +static void adm5120_if_tx_timeout(struct net_device *dev) +{ + SW_INFO("TX timeout on %s\n",dev->name); +} + +static void adm5120_if_set_multicast_list(struct net_device *dev) +{ + struct adm5120_if_priv *priv = netdev_priv(dev); + u32 ports; + u32 t; + + ports = adm5120_eth_vlans[priv->vlan_no] & SWITCH_PORTS_NOCPU; + + t = sw_read_reg(SWITCH_REG_CPUP_CONF); + if (dev->flags & IFF_PROMISC) + /* enable unknown packets */ + t &= ~(ports << CPUP_CONF_DUNP_SHIFT); + else + /* disable unknown packets */ + t |= (ports << CPUP_CONF_DUNP_SHIFT); + + if (dev->flags & IFF_PROMISC || dev->flags & IFF_ALLMULTI || + dev->mc_count) + /* enable multicast packets */ + t &= ~(ports << CPUP_CONF_DMCP_SHIFT); + else + /* disable multicast packets */ + t |= (ports << CPUP_CONF_DMCP_SHIFT); + + /* If there is any port configured to be in promiscuous mode, then the */ + /* Bridge Test Mode has to be activated. This will result in */ + /* transporting also packets learned in another VLAN to be forwarded */ + /* to the CPU. */ + /* The difficult scenario is when we want to build a bridge on the CPU.*/ + /* Assume we have port0 and the CPU port in VLAN0 and port1 and the */ + /* CPU port in VLAN1. Now we build a bridge on the CPU between */ + /* VLAN0 and VLAN1. Both ports of the VLANs are set in promisc mode. */ + /* Now assume a packet with ethernet source address 99 enters port 0 */ + /* It will be forwarded to the CPU because it is unknown. Then the */ + /* bridge in the CPU will send it to VLAN1 and it goes out at port 1. */ + /* When now a packet with ethernet destination address 99 comes in at */ + /* port 1 in VLAN1, then the switch has learned that this address is */ + /* located at port 0 in VLAN0. Therefore the switch will drop */ + /* this packet. In order to avoid this and to send the packet still */ + /* to the CPU, the Bridge Test Mode has to be activated. */ + + /* Check if there is any vlan in promisc mode. */ + if (t & (SWITCH_PORTS_NOCPU << CPUP_CONF_DUNP_SHIFT)) + t &= ~CPUP_CONF_BTM; /* Disable Bridge Testing Mode */ + else + t |= CPUP_CONF_BTM; /* Enable Bridge Testing Mode */ + + sw_write_reg(SWITCH_REG_CPUP_CONF, t); + +} + +static int adm5120_if_set_mac_address(struct net_device *dev, void *p) +{ + struct sockaddr *addr = p; + + memcpy(dev->dev_addr, addr->sa_data, dev->addr_len); + adm5120_write_mac(dev); + return 0; +} + +static int adm5120_if_do_ioctl(struct net_device *dev, struct ifreq *rq, + int cmd) +{ + int err; + struct adm5120_sw_info info; + struct adm5120_if_priv *priv = netdev_priv(dev); + + switch(cmd) { + case SIOCGADMINFO: + info.magic = 0x5120; + info.ports = adm5120_nrdevs; + info.vlan = priv->vlan_no; + err = copy_to_user(rq->ifr_data, &info, sizeof(info)); + if (err) + return -EFAULT; + break; + case SIOCSMATRIX: + if (!capable(CAP_NET_ADMIN)) + return -EPERM; + err = copy_from_user(adm5120_eth_vlans, rq->ifr_data, + sizeof(adm5120_eth_vlans)); + if (err) + return -EFAULT; + adm5120_set_vlan(adm5120_eth_vlans); + break; + case SIOCGMATRIX: + err = copy_to_user(rq->ifr_data, adm5120_eth_vlans, + sizeof(adm5120_eth_vlans)); + if (err) + return -EFAULT; + break; + default: + return -EOPNOTSUPP; + } + return 0; +} + +static struct net_device *adm5120_if_alloc(void) +{ + struct net_device *dev; + struct adm5120_if_priv *priv; + + dev = alloc_etherdev(sizeof(*priv)); + if (!dev) + return NULL; + + priv = netdev_priv(dev); + priv->dev = dev; + + dev->irq = ADM5120_IRQ_SWITCH; + dev->open = adm5120_if_open; + dev->hard_start_xmit = adm5120_if_hard_start_xmit; + dev->stop = adm5120_if_stop; + dev->set_multicast_list = adm5120_if_set_multicast_list; + dev->do_ioctl = adm5120_if_do_ioctl; + dev->tx_timeout = adm5120_if_tx_timeout; + dev->watchdog_timeo = TX_TIMEOUT; + dev->set_mac_address = adm5120_if_set_mac_address; + +#ifdef CONFIG_ADM5120_SWITCH_NAPI + netif_napi_add(dev, &priv->napi, adm5120_if_poll, 64); +#endif + + return dev; +} + +/* ------------------------------------------------------------------------ */ + +static void adm5120_switch_cleanup(void) +{ + int i; + + /* disable interrupts */ + sw_int_mask(SWITCH_INTS_ALL); + + for (i = 0; i < SWITCH_NUM_PORTS; i++) { + struct net_device *dev = adm5120_devs[i]; + if (dev) { + unregister_netdev(dev); + free_netdev(dev); + } + } + + adm5120_switch_tx_ring_free(); + adm5120_switch_rx_ring_free(); +} + +static int __init adm5120_switch_probe(struct platform_device *pdev) +{ + u32 t; + int i, err; + + adm5120_nrdevs = adm5120_eth_num_ports; + + t = CPUP_CONF_DCPUP | CPUP_CONF_CRCP | + SWITCH_PORTS_NOCPU << CPUP_CONF_DUNP_SHIFT | + SWITCH_PORTS_NOCPU << CPUP_CONF_DMCP_SHIFT ; + sw_write_reg(SWITCH_REG_CPUP_CONF, t); + + t = (SWITCH_PORTS_NOCPU << PORT_CONF0_EMCP_SHIFT) | + (SWITCH_PORTS_NOCPU << PORT_CONF0_BP_SHIFT) | + (SWITCH_PORTS_NOCPU); + sw_write_reg(SWITCH_REG_PORT_CONF0, t); + + /* setup ports to Autoneg/100M/Full duplex/Auto MDIX */ + t = SWITCH_PORTS_PHY | + (SWITCH_PORTS_PHY << PHY_CNTL2_SC_SHIFT) | + (SWITCH_PORTS_PHY << PHY_CNTL2_DC_SHIFT) | + (SWITCH_PORTS_PHY << PHY_CNTL2_PHYR_SHIFT) | + (SWITCH_PORTS_PHY << PHY_CNTL2_AMDIX_SHIFT) | + PHY_CNTL2_RMAE; + sw_write_reg(SWITCH_REG_PHY_CNTL2, t); + + t = sw_read_reg(SWITCH_REG_PHY_CNTL3); + t |= PHY_CNTL3_RNT; + sw_write_reg(SWITCH_REG_PHY_CNTL3, t); + + /* Force all the packets from all ports are low priority */ + sw_write_reg(SWITCH_REG_PRI_CNTL, 0); + + sw_int_mask(SWITCH_INTS_ALL); + sw_int_ack(SWITCH_INTS_ALL); + + err = adm5120_switch_rx_ring_alloc(); + if (err) + goto err; + + err = adm5120_switch_tx_ring_alloc(); + if (err) + goto err; + + adm5120_switch_tx_ring_reset(txl_descs, txl_skbuff, TX_RING_SIZE); + adm5120_switch_rx_ring_reset(rxl_descs, rxl_skbuff, RX_RING_SIZE); + + sw_write_reg(SWITCH_REG_SHDA, 0); + sw_write_reg(SWITCH_REG_SLDA, KSEG1ADDR(txl_descs)); + sw_write_reg(SWITCH_REG_RHDA, 0); + sw_write_reg(SWITCH_REG_RLDA, KSEG1ADDR(rxl_descs)); + + for (i = 0; i < SWITCH_NUM_PORTS; i++) { + struct net_device *dev; + struct adm5120_if_priv *priv; + + dev = adm5120_if_alloc(); + if (!dev) { + err = -ENOMEM; + goto err; + } + + adm5120_devs[i] = dev; + priv = netdev_priv(dev); + + priv->vlan_no = i; + priv->port_mask = adm5120_eth_vlans[i]; + + memcpy(dev->dev_addr, adm5120_eth_macs[i], 6); + adm5120_write_mac(dev); + + err = register_netdev(dev); + if (err) { + SW_INFO("%s register failed, error=%d\n", + dev->name, err); + goto err; + } + } + + /* setup vlan/port mapping after devs are filled up */ + adm5120_set_vlan(adm5120_eth_vlans); + + /* enable CPU port */ + t = sw_read_reg(SWITCH_REG_CPUP_CONF); + t &= ~CPUP_CONF_DCPUP; + sw_write_reg(SWITCH_REG_CPUP_CONF, t); + + return 0; + +err: + adm5120_switch_cleanup(); + + SW_ERR("init failed\n"); + return err; +} + +static int adm5120_switch_remove(struct platform_device *dev) +{ + adm5120_switch_cleanup(); + return 0; +} + +static struct platform_driver adm5120_switch_driver = { + .probe = adm5120_switch_probe, + .remove = adm5120_switch_remove, + .driver = { + .name = DRV_NAME, + }, +}; + +/* -------------------------------------------------------------------------- */ + +static int __init adm5120_switch_mod_init(void) +{ + int err; + + pr_info(DRV_DESC " version " DRV_VERSION "\n"); + err = platform_driver_register(&adm5120_switch_driver); + + return err; +} + +static void __exit adm5120_switch_mod_exit(void) +{ + platform_driver_unregister(&adm5120_switch_driver); +} + +module_init(adm5120_switch_mod_init); +module_exit(adm5120_switch_mod_exit); + +MODULE_LICENSE("GPL v2"); +MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>"); +MODULE_DESCRIPTION(DRV_DESC); +MODULE_VERSION(DRV_VERSION); |