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idt77252.c
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/*******************************************************************
*
* Copyright (c) 2000 ATecoM GmbH
*
* The author may be reached at ecd@atecom.com.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
* NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 675 Mass Ave, Cambridge, MA 02139, USA.
*
*******************************************************************/
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/poison.h>
#include <linux/skbuff.h>
#include <linux/kernel.h>
#include <linux/vmalloc.h>
#include <linux/netdevice.h>
#include <linux/atmdev.h>
#include <linux/atm.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/bitops.h>
#include <linux/wait.h>
#include <linux/jiffies.h>
#include <linux/mutex.h>
#include <linux/slab.h>
#include <asm/io.h>
#include <linux/uaccess.h>
#include <linux/atomic.h>
#include <asm/byteorder.h>
#ifdef CONFIG_ATM_IDT77252_USE_SUNI
#include "suni.h"
#endif /* CONFIG_ATM_IDT77252_USE_SUNI */
#include "idt77252.h"
#include "idt77252_tables.h"
static unsigned int vpibits = 1;
#define ATM_IDT77252_SEND_IDLE 1
/*
* Debug HACKs.
*/
#define DEBUG_MODULE 1
#undef HAVE_EEPROM /* does not work, yet. */
#ifdef CONFIG_ATM_IDT77252_DEBUG
static unsigned long debug = DBG_GENERAL;
#endif
#define SAR_RX_DELAY (SAR_CFG_RXINT_NODELAY)
/*
* SCQ Handling.
*/
static struct scq_info *alloc_scq(struct idt77252_dev *, int);
static void free_scq(struct idt77252_dev *, struct scq_info *);
static int queue_skb(struct idt77252_dev *, struct vc_map *,
struct sk_buff *, int oam);
static void drain_scq(struct idt77252_dev *, struct vc_map *);
static unsigned long get_free_scd(struct idt77252_dev *, struct vc_map *);
static void fill_scd(struct idt77252_dev *, struct scq_info *, int);
/*
* FBQ Handling.
*/
static int push_rx_skb(struct idt77252_dev *,
struct sk_buff *, int queue);
static void recycle_rx_skb(struct idt77252_dev *, struct sk_buff *);
static void flush_rx_pool(struct idt77252_dev *, struct rx_pool *);
static void recycle_rx_pool_skb(struct idt77252_dev *,
struct rx_pool *);
static void add_rx_skb(struct idt77252_dev *, int queue,
unsigned int size, unsigned int count);
/*
* RSQ Handling.
*/
static int init_rsq(struct idt77252_dev *);
static void deinit_rsq(struct idt77252_dev *);
static void idt77252_rx(struct idt77252_dev *);
/*
* TSQ handling.
*/
static int init_tsq(struct idt77252_dev *);
static void deinit_tsq(struct idt77252_dev *);
static void idt77252_tx(struct idt77252_dev *);
/*
* ATM Interface.
*/
static void idt77252_dev_close(struct atm_dev *dev);
static int idt77252_open(struct atm_vcc *vcc);
static void idt77252_close(struct atm_vcc *vcc);
static int idt77252_send(struct atm_vcc *vcc, struct sk_buff *skb);
static int idt77252_send_oam(struct atm_vcc *vcc, void *cell,
int flags);
static void idt77252_phy_put(struct atm_dev *dev, unsigned char value,
unsigned long addr);
static unsigned char idt77252_phy_get(struct atm_dev *dev, unsigned long addr);
static int idt77252_change_qos(struct atm_vcc *vcc, struct atm_qos *qos,
int flags);
static int idt77252_proc_read(struct atm_dev *dev, loff_t * pos,
char *page);
static void idt77252_softint(struct work_struct *work);
static const struct atmdev_ops idt77252_ops =
{
.dev_close = idt77252_dev_close,
.open = idt77252_open,
.close = idt77252_close,
.send = idt77252_send,
.send_oam = idt77252_send_oam,
.phy_put = idt77252_phy_put,
.phy_get = idt77252_phy_get,
.change_qos = idt77252_change_qos,
.proc_read = idt77252_proc_read,
.owner = THIS_MODULE
};
static struct idt77252_dev *idt77252_chain = NULL;
static unsigned int idt77252_sram_write_errors = 0;
/*****************************************************************************/
/* */
/* I/O and Utility Bus */
/* */
/*****************************************************************************/
static void
waitfor_idle(struct idt77252_dev *card)
{
u32 stat;
stat = readl(SAR_REG_STAT);
while (stat & SAR_STAT_CMDBZ)
stat = readl(SAR_REG_STAT);
}
static u32
read_sram(struct idt77252_dev *card, unsigned long addr)
{
unsigned long flags;
u32 value;
spin_lock_irqsave(&card->cmd_lock, flags);
writel(SAR_CMD_READ_SRAM | (addr << 2), SAR_REG_CMD);
waitfor_idle(card);
value = readl(SAR_REG_DR0);
spin_unlock_irqrestore(&card->cmd_lock, flags);
return value;
}
static void
write_sram(struct idt77252_dev *card, unsigned long addr, u32 value)
{
unsigned long flags;
if ((idt77252_sram_write_errors == 0) &&
(((addr > card->tst[0] + card->tst_size - 2) &&
(addr < card->tst[0] + card->tst_size)) ||
((addr > card->tst[1] + card->tst_size - 2) &&
(addr < card->tst[1] + card->tst_size)))) {
printk("%s: ERROR: TST JMP section at %08lx written: %08x\n",
card->name, addr, value);
}
spin_lock_irqsave(&card->cmd_lock, flags);
writel(value, SAR_REG_DR0);
writel(SAR_CMD_WRITE_SRAM | (addr << 2), SAR_REG_CMD);
waitfor_idle(card);
spin_unlock_irqrestore(&card->cmd_lock, flags);
}
static u8
read_utility(void *dev, unsigned long ubus_addr)
{
struct idt77252_dev *card = dev;
unsigned long flags;
u8 value;
if (!card) {
printk("Error: No such device.\n");
return -1;
}
spin_lock_irqsave(&card->cmd_lock, flags);
writel(SAR_CMD_READ_UTILITY + ubus_addr, SAR_REG_CMD);
waitfor_idle(card);
value = readl(SAR_REG_DR0);
spin_unlock_irqrestore(&card->cmd_lock, flags);
return value;
}
static void
write_utility(void *dev, unsigned long ubus_addr, u8 value)
{
struct idt77252_dev *card = dev;
unsigned long flags;
if (!card) {
printk("Error: No such device.\n");
return;
}
spin_lock_irqsave(&card->cmd_lock, flags);
writel((u32) value, SAR_REG_DR0);
writel(SAR_CMD_WRITE_UTILITY + ubus_addr, SAR_REG_CMD);
waitfor_idle(card);
spin_unlock_irqrestore(&card->cmd_lock, flags);
}
#ifdef HAVE_EEPROM
static u32 rdsrtab[] =
{
SAR_GP_EECS | SAR_GP_EESCLK,
0,
SAR_GP_EESCLK, /* 0 */
0,
SAR_GP_EESCLK, /* 0 */
0,
SAR_GP_EESCLK, /* 0 */
0,
SAR_GP_EESCLK, /* 0 */
0,
SAR_GP_EESCLK, /* 0 */
SAR_GP_EEDO,
SAR_GP_EESCLK | SAR_GP_EEDO, /* 1 */
0,
SAR_GP_EESCLK, /* 0 */
SAR_GP_EEDO,
SAR_GP_EESCLK | SAR_GP_EEDO /* 1 */
};
static u32 wrentab[] =
{
SAR_GP_EECS | SAR_GP_EESCLK,
0,
SAR_GP_EESCLK, /* 0 */
0,
SAR_GP_EESCLK, /* 0 */
0,
SAR_GP_EESCLK, /* 0 */
0,
SAR_GP_EESCLK, /* 0 */
SAR_GP_EEDO,
SAR_GP_EESCLK | SAR_GP_EEDO, /* 1 */
SAR_GP_EEDO,
SAR_GP_EESCLK | SAR_GP_EEDO, /* 1 */
0,
SAR_GP_EESCLK, /* 0 */
0,
SAR_GP_EESCLK /* 0 */
};
static u32 rdtab[] =
{
SAR_GP_EECS | SAR_GP_EESCLK,
0,
SAR_GP_EESCLK, /* 0 */
0,
SAR_GP_EESCLK, /* 0 */
0,
SAR_GP_EESCLK, /* 0 */
0,
SAR_GP_EESCLK, /* 0 */
0,
SAR_GP_EESCLK, /* 0 */
0,
SAR_GP_EESCLK, /* 0 */
SAR_GP_EEDO,
SAR_GP_EESCLK | SAR_GP_EEDO, /* 1 */
SAR_GP_EEDO,
SAR_GP_EESCLK | SAR_GP_EEDO /* 1 */
};
static u32 wrtab[] =
{
SAR_GP_EECS | SAR_GP_EESCLK,
0,
SAR_GP_EESCLK, /* 0 */
0,
SAR_GP_EESCLK, /* 0 */
0,
SAR_GP_EESCLK, /* 0 */
0,
SAR_GP_EESCLK, /* 0 */
0,
SAR_GP_EESCLK, /* 0 */
0,
SAR_GP_EESCLK, /* 0 */
SAR_GP_EEDO,
SAR_GP_EESCLK | SAR_GP_EEDO, /* 1 */
0,
SAR_GP_EESCLK /* 0 */
};
static u32 clktab[] =
{
0,
SAR_GP_EESCLK,
0,
SAR_GP_EESCLK,
0,
SAR_GP_EESCLK,
0,
SAR_GP_EESCLK,
0,
SAR_GP_EESCLK,
0,
SAR_GP_EESCLK,
0,
SAR_GP_EESCLK,
0,
SAR_GP_EESCLK,
0
};
static u32
idt77252_read_gp(struct idt77252_dev *card)
{
u32 gp;
gp = readl(SAR_REG_GP);
#if 0
printk("RD: %s\n", gp & SAR_GP_EEDI ? "1" : "0");
#endif
return gp;
}
static void
idt77252_write_gp(struct idt77252_dev *card, u32 value)
{
unsigned long flags;
#if 0
printk("WR: %s %s %s\n", value & SAR_GP_EECS ? " " : "/CS",
value & SAR_GP_EESCLK ? "HIGH" : "LOW ",
value & SAR_GP_EEDO ? "1" : "0");
#endif
spin_lock_irqsave(&card->cmd_lock, flags);
waitfor_idle(card);
writel(value, SAR_REG_GP);
spin_unlock_irqrestore(&card->cmd_lock, flags);
}
static u8
idt77252_eeprom_read_status(struct idt77252_dev *card)
{
u8 byte;
u32 gp;
int i, j;
gp = idt77252_read_gp(card) & ~(SAR_GP_EESCLK|SAR_GP_EECS|SAR_GP_EEDO);
for (i = 0; i < ARRAY_SIZE(rdsrtab); i++) {
idt77252_write_gp(card, gp | rdsrtab[i]);
udelay(5);
}
idt77252_write_gp(card, gp | SAR_GP_EECS);
udelay(5);
byte = 0;
for (i = 0, j = 0; i < 8; i++) {
byte <<= 1;
idt77252_write_gp(card, gp | clktab[j++]);
udelay(5);
byte |= idt77252_read_gp(card) & SAR_GP_EEDI ? 1 : 0;
idt77252_write_gp(card, gp | clktab[j++]);
udelay(5);
}
idt77252_write_gp(card, gp | SAR_GP_EECS);
udelay(5);
return byte;
}
static u8
idt77252_eeprom_read_byte(struct idt77252_dev *card, u8 offset)
{
u8 byte;
u32 gp;
int i, j;
gp = idt77252_read_gp(card) & ~(SAR_GP_EESCLK|SAR_GP_EECS|SAR_GP_EEDO);
for (i = 0; i < ARRAY_SIZE(rdtab); i++) {
idt77252_write_gp(card, gp | rdtab[i]);
udelay(5);
}
idt77252_write_gp(card, gp | SAR_GP_EECS);
udelay(5);
for (i = 0, j = 0; i < 8; i++) {
idt77252_write_gp(card, gp | clktab[j++] |
(offset & 1 ? SAR_GP_EEDO : 0));
udelay(5);
idt77252_write_gp(card, gp | clktab[j++] |
(offset & 1 ? SAR_GP_EEDO : 0));
udelay(5);
offset >>= 1;
}
idt77252_write_gp(card, gp | SAR_GP_EECS);
udelay(5);
byte = 0;
for (i = 0, j = 0; i < 8; i++) {
byte <<= 1;
idt77252_write_gp(card, gp | clktab[j++]);
udelay(5);
byte |= idt77252_read_gp(card) & SAR_GP_EEDI ? 1 : 0;
idt77252_write_gp(card, gp | clktab[j++]);
udelay(5);
}
idt77252_write_gp(card, gp | SAR_GP_EECS);
udelay(5);
return byte;
}
static void
idt77252_eeprom_write_byte(struct idt77252_dev *card, u8 offset, u8 data)
{
u32 gp;
int i, j;
gp = idt77252_read_gp(card) & ~(SAR_GP_EESCLK|SAR_GP_EECS|SAR_GP_EEDO);
for (i = 0; i < ARRAY_SIZE(wrentab); i++) {
idt77252_write_gp(card, gp | wrentab[i]);
udelay(5);
}
idt77252_write_gp(card, gp | SAR_GP_EECS);
udelay(5);
for (i = 0; i < ARRAY_SIZE(wrtab); i++) {
idt77252_write_gp(card, gp | wrtab[i]);
udelay(5);
}
idt77252_write_gp(card, gp | SAR_GP_EECS);
udelay(5);
for (i = 0, j = 0; i < 8; i++) {
idt77252_write_gp(card, gp | clktab[j++] |
(offset & 1 ? SAR_GP_EEDO : 0));
udelay(5);
idt77252_write_gp(card, gp | clktab[j++] |
(offset & 1 ? SAR_GP_EEDO : 0));
udelay(5);
offset >>= 1;
}
idt77252_write_gp(card, gp | SAR_GP_EECS);
udelay(5);
for (i = 0, j = 0; i < 8; i++) {
idt77252_write_gp(card, gp | clktab[j++] |
(data & 1 ? SAR_GP_EEDO : 0));
udelay(5);
idt77252_write_gp(card, gp | clktab[j++] |
(data & 1 ? SAR_GP_EEDO : 0));
udelay(5);
data >>= 1;
}
idt77252_write_gp(card, gp | SAR_GP_EECS);
udelay(5);
}
static void
idt77252_eeprom_init(struct idt77252_dev *card)
{
u32 gp;
gp = idt77252_read_gp(card) & ~(SAR_GP_EESCLK|SAR_GP_EECS|SAR_GP_EEDO);
idt77252_write_gp(card, gp | SAR_GP_EECS | SAR_GP_EESCLK);
udelay(5);
idt77252_write_gp(card, gp | SAR_GP_EECS);
udelay(5);
idt77252_write_gp(card, gp | SAR_GP_EECS | SAR_GP_EESCLK);
udelay(5);
idt77252_write_gp(card, gp | SAR_GP_EECS);
udelay(5);
}
#endif /* HAVE_EEPROM */
#ifdef CONFIG_ATM_IDT77252_DEBUG
static void
dump_tct(struct idt77252_dev *card, int index)
{
unsigned long tct;
int i;
tct = (unsigned long) (card->tct_base + index * SAR_SRAM_TCT_SIZE);
printk("%s: TCT %x:", card->name, index);
for (i = 0; i < 8; i++) {
printk(" %08x", read_sram(card, tct + i));
}
printk("\n");
}
static void
idt77252_tx_dump(struct idt77252_dev *card)
{
struct atm_vcc *vcc;
struct vc_map *vc;
int i;
printk("%s\n", __func__);
for (i = 0; i < card->tct_size; i++) {
vc = card->vcs[i];
if (!vc)
continue;
vcc = NULL;
if (vc->rx_vcc)
vcc = vc->rx_vcc;
else if (vc->tx_vcc)
vcc = vc->tx_vcc;
if (!vcc)
continue;
printk("%s: Connection %d:\n", card->name, vc->index);
dump_tct(card, vc->index);
}
}
#endif
/*****************************************************************************/
/* */
/* SCQ Handling */
/* */
/*****************************************************************************/
static int
sb_pool_add(struct idt77252_dev *card, struct sk_buff *skb, int queue)
{
struct sb_pool *pool = &card->sbpool[queue];
int index;
index = pool->index;
while (pool->skb[index]) {
index = (index + 1) & FBQ_MASK;
if (index == pool->index)
return -ENOBUFS;
}
pool->skb[index] = skb;
IDT77252_PRV_POOL(skb) = POOL_HANDLE(queue, index);
pool->index = (index + 1) & FBQ_MASK;
return 0;
}
static void
sb_pool_remove(struct idt77252_dev *card, struct sk_buff *skb)
{
unsigned int queue, index;
u32 handle;
handle = IDT77252_PRV_POOL(skb);
queue = POOL_QUEUE(handle);
if (queue > 3)
return;
index = POOL_INDEX(handle);
if (index > FBQ_SIZE - 1)
return;
card->sbpool[queue].skb[index] = NULL;
}
static struct sk_buff *
sb_pool_skb(struct idt77252_dev *card, u32 handle)
{
unsigned int queue, index;
queue = POOL_QUEUE(handle);
if (queue > 3)
return NULL;
index = POOL_INDEX(handle);
if (index > FBQ_SIZE - 1)
return NULL;
return card->sbpool[queue].skb[index];
}
static struct scq_info *
alloc_scq(struct idt77252_dev *card, int class)
{
struct scq_info *scq;
scq = kzalloc(sizeof(struct scq_info), GFP_KERNEL);
if (!scq)
return NULL;
scq->base = dma_alloc_coherent(&card->pcidev->dev, SCQ_SIZE,
&scq->paddr, GFP_KERNEL);
if (scq->base == NULL) {
kfree(scq);
return NULL;
}
scq->next = scq->base;
scq->last = scq->base + (SCQ_ENTRIES - 1);
atomic_set(&scq->used, 0);
spin_lock_init(&scq->lock);
spin_lock_init(&scq->skblock);
skb_queue_head_init(&scq->transmit);
skb_queue_head_init(&scq->pending);
TXPRINTK("idt77252: SCQ: base 0x%p, next 0x%p, last 0x%p, paddr %08llx\n",
scq->base, scq->next, scq->last, (unsigned long long)scq->paddr);
return scq;
}
static void
free_scq(struct idt77252_dev *card, struct scq_info *scq)
{
struct sk_buff *skb;
struct atm_vcc *vcc;
dma_free_coherent(&card->pcidev->dev, SCQ_SIZE,
scq->base, scq->paddr);
while ((skb = skb_dequeue(&scq->transmit))) {
dma_unmap_single(&card->pcidev->dev, IDT77252_PRV_PADDR(skb),
skb->len, DMA_TO_DEVICE);
vcc = ATM_SKB(skb)->vcc;
if (vcc->pop)
vcc->pop(vcc, skb);
else
dev_kfree_skb(skb);
}
while ((skb = skb_dequeue(&scq->pending))) {
dma_unmap_single(&card->pcidev->dev, IDT77252_PRV_PADDR(skb),
skb->len, DMA_TO_DEVICE);
vcc = ATM_SKB(skb)->vcc;
if (vcc->pop)
vcc->pop(vcc, skb);
else
dev_kfree_skb(skb);
}
kfree(scq);
}
static int
push_on_scq(struct idt77252_dev *card, struct vc_map *vc, struct sk_buff *skb)
{
struct scq_info *scq = vc->scq;
unsigned long flags;
struct scqe *tbd;
int entries;
TXPRINTK("%s: SCQ: next 0x%p\n", card->name, scq->next);
atomic_inc(&scq->used);
entries = atomic_read(&scq->used);
if (entries > (SCQ_ENTRIES - 1)) {
atomic_dec(&scq->used);
goto out;
}
skb_queue_tail(&scq->transmit, skb);
spin_lock_irqsave(&vc->lock, flags);
if (vc->estimator) {
struct atm_vcc *vcc = vc->tx_vcc;
struct sock *sk = sk_atm(vcc);
vc->estimator->cells += (skb->len + 47) / 48;
if (refcount_read(&sk->sk_wmem_alloc) >
(sk->sk_sndbuf >> 1)) {
u32 cps = vc->estimator->maxcps;
vc->estimator->cps = cps;
vc->estimator->avcps = cps << 5;
if (vc->lacr < vc->init_er) {
vc->lacr = vc->init_er;
writel(TCMDQ_LACR | (vc->lacr << 16) |
vc->index, SAR_REG_TCMDQ);
}
}
}
spin_unlock_irqrestore(&vc->lock, flags);
tbd = &IDT77252_PRV_TBD(skb);
spin_lock_irqsave(&scq->lock, flags);
scq->next->word_1 = cpu_to_le32(tbd->word_1 |
SAR_TBD_TSIF | SAR_TBD_GTSI);
scq->next->word_2 = cpu_to_le32(tbd->word_2);
scq->next->word_3 = cpu_to_le32(tbd->word_3);
scq->next->word_4 = cpu_to_le32(tbd->word_4);
if (scq->next == scq->last)
scq->next = scq->base;
else
scq->next++;
write_sram(card, scq->scd,
scq->paddr +
(u32)((unsigned long)scq->next - (unsigned long)scq->base));
spin_unlock_irqrestore(&scq->lock, flags);
scq->trans_start = jiffies;
if (test_and_clear_bit(VCF_IDLE, &vc->flags)) {
writel(TCMDQ_START_LACR | (vc->lacr << 16) | vc->index,
SAR_REG_TCMDQ);
}
TXPRINTK("%d entries in SCQ used (push).\n", atomic_read(&scq->used));
XPRINTK("%s: SCQ (after push %2d) head = 0x%x, next = 0x%p.\n",
card->name, atomic_read(&scq->used),
read_sram(card, scq->scd + 1), scq->next);
return 0;
out:
if (time_after(jiffies, scq->trans_start + HZ)) {
printk("%s: Error pushing TBD for %d.%d\n",
card->name, vc->tx_vcc->vpi, vc->tx_vcc->vci);
#ifdef CONFIG_ATM_IDT77252_DEBUG
idt77252_tx_dump(card);
#endif
scq->trans_start = jiffies;
}
return -ENOBUFS;
}
static void
drain_scq(struct idt77252_dev *card, struct vc_map *vc)
{
struct scq_info *scq = vc->scq;
struct sk_buff *skb;
struct atm_vcc *vcc;
TXPRINTK("%s: SCQ (before drain %2d) next = 0x%p.\n",
card->name, atomic_read(&scq->used), scq->next);
skb = skb_dequeue(&scq->transmit);
if (skb) {
TXPRINTK("%s: freeing skb at %p.\n", card->name, skb);
dma_unmap_single(&card->pcidev->dev, IDT77252_PRV_PADDR(skb),
skb->len, DMA_TO_DEVICE);
vcc = ATM_SKB(skb)->vcc;
if (vcc->pop)
vcc->pop(vcc, skb);
else
dev_kfree_skb(skb);
atomic_inc(&vcc->stats->tx);
}
atomic_dec(&scq->used);
spin_lock(&scq->skblock);
while ((skb = skb_dequeue(&scq->pending))) {
if (push_on_scq(card, vc, skb)) {
skb_queue_head(&vc->scq->pending, skb);
break;
}
}
spin_unlock(&scq->skblock);
}
static int
queue_skb(struct idt77252_dev *card, struct vc_map *vc,
struct sk_buff *skb, int oam)
{
struct atm_vcc *vcc;
struct scqe *tbd;
unsigned long flags;
int error;
int aal;
u32 word4;
if (skb->len == 0) {
printk("%s: invalid skb->len (%d)\n", card->name, skb->len);
return -EINVAL;
}
TXPRINTK("%s: Sending %d bytes of data.\n",
card->name, skb->len);
tbd = &IDT77252_PRV_TBD(skb);
vcc = ATM_SKB(skb)->vcc;
word4 = (skb->data[0] << 24) | (skb->data[1] << 16) |
(skb->data[2] << 8) | (skb->data[3] << 0);
IDT77252_PRV_PADDR(skb) = dma_map_single(&card->pcidev->dev, skb->data,
skb->len, DMA_TO_DEVICE);
error = -EINVAL;
if (oam) {
if (skb->len != 52)
goto errout;
tbd->word_1 = SAR_TBD_OAM | ATM_CELL_PAYLOAD | SAR_TBD_EPDU;
tbd->word_2 = IDT77252_PRV_PADDR(skb) + 4;
tbd->word_3 = 0x00000000;
tbd->word_4 = word4;
if (test_bit(VCF_RSV, &vc->flags))
vc = card->vcs[0];
goto done;
}
if (test_bit(VCF_RSV, &vc->flags)) {
printk("%s: Trying to transmit on reserved VC\n", card->name);
goto errout;
}
aal = vcc->qos.aal;
switch (aal) {
case ATM_AAL0:
case ATM_AAL34:
if (skb->len > 52)
goto errout;
if (aal == ATM_AAL0)
tbd->word_1 = SAR_TBD_EPDU | SAR_TBD_AAL0 |
ATM_CELL_PAYLOAD;
else
tbd->word_1 = SAR_TBD_EPDU | SAR_TBD_AAL34 |
ATM_CELL_PAYLOAD;
tbd->word_2 = IDT77252_PRV_PADDR(skb) + 4;
tbd->word_3 = 0x00000000;
tbd->word_4 = word4;
break;
case ATM_AAL5:
tbd->word_1 = SAR_TBD_EPDU | SAR_TBD_AAL5 | skb->len;
tbd->word_2 = IDT77252_PRV_PADDR(skb);
tbd->word_3 = skb->len;
tbd->word_4 = (vcc->vpi << SAR_TBD_VPI_SHIFT) |
(vcc->vci << SAR_TBD_VCI_SHIFT);
break;
case ATM_AAL1:
case ATM_AAL2:
default:
printk("%s: Traffic type not supported.\n", card->name);
error = -EPROTONOSUPPORT;
goto errout;
}
done:
spin_lock_irqsave(&vc->scq->skblock, flags);
skb_queue_tail(&vc->scq->pending, skb);
while ((skb = skb_dequeue(&vc->scq->pending))) {
if (push_on_scq(card, vc, skb)) {
skb_queue_head(&vc->scq->pending, skb);
break;
}
}
spin_unlock_irqrestore(&vc->scq->skblock, flags);
return 0;
errout:
dma_unmap_single(&card->pcidev->dev, IDT77252_PRV_PADDR(skb),
skb->len, DMA_TO_DEVICE);
return error;
}
static unsigned long
get_free_scd(struct idt77252_dev *card, struct vc_map *vc)
{
int i;
for (i = 0; i < card->scd_size; i++) {
if (!card->scd2vc[i]) {
card->scd2vc[i] = vc;
vc->scd_index = i;
return card->scd_base + i * SAR_SRAM_SCD_SIZE;
}
}
return 0;
}
static void
fill_scd(struct idt77252_dev *card, struct scq_info *scq, int class)
{
write_sram(card, scq->scd, scq->paddr);
write_sram(card, scq->scd + 1, 0x00000000);
write_sram(card, scq->scd + 2, 0xffffffff);
write_sram(card, scq->scd + 3, 0x00000000);
}
static void
clear_scd(struct idt77252_dev *card, struct scq_info *scq, int class)
{
return;
}
/*****************************************************************************/
/* */
/* RSQ Handling */
/* */
/*****************************************************************************/
static int
init_rsq(struct idt77252_dev *card)
{
struct rsq_entry *rsqe;
card->rsq.base = dma_alloc_coherent(&card->pcidev->dev, RSQSIZE,
&card->rsq.paddr, GFP_KERNEL);
if (card->rsq.base == NULL) {
printk("%s: can't allocate RSQ.\n", card->name);
return -1;
}
card->rsq.last = card->rsq.base + RSQ_NUM_ENTRIES - 1;
card->rsq.next = card->rsq.last;
for (rsqe = card->rsq.base; rsqe <= card->rsq.last; rsqe++)
rsqe->word_4 = 0;
writel((unsigned long) card->rsq.last - (unsigned long) card->rsq.base,
SAR_REG_RSQH);
writel(card->rsq.paddr, SAR_REG_RSQB);
IPRINTK("%s: RSQ base at 0x%lx (0x%x).\n", card->name,
(unsigned long) card->rsq.base,
readl(SAR_REG_RSQB));
IPRINTK("%s: RSQ head = 0x%x, base = 0x%x, tail = 0x%x.\n",
card->name,
readl(SAR_REG_RSQH),
readl(SAR_REG_RSQB),
readl(SAR_REG_RSQT));
return 0;