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OpenCloudOS-Kernel/drivers/atm/solos-pci.c

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/*
* Driver for the Solos PCI ADSL2+ card, designed to support Linux by
* Traverse Technologies -- http://www.traverse.com.au/
* Xrio Limited -- http://www.xrio.com/
*
*
* Copyright © 2008 Traverse Technologies
* Copyright © 2008 Intel Corporation
*
* Authors: Nathan Williams <nathan@traverse.com.au>
* David Woodhouse <dwmw2@infradead.org>
*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#define DEBUG
#define VERBOSE_DEBUG
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/ioport.h>
#include <linux/types.h>
#include <linux/pci.h>
#include <linux/atm.h>
#include <linux/atmdev.h>
#include <linux/skbuff.h>
#include <linux/sysfs.h>
#include <linux/device.h>
#include <linux/kobject.h>
#define VERSION "0.04"
#define PTAG "solos-pci"
#define CONFIG_RAM_SIZE 128
#define FLAGS_ADDR 0x7C
#define IRQ_EN_ADDR 0x78
#define FPGA_VER 0x74
#define IRQ_CLEAR 0x70
#define BUG_FLAG 0x6C
#define DATA_RAM_SIZE 32768
#define BUF_SIZE 4096
#define RX_BUF(card, nr) ((card->buffers) + (nr)*BUF_SIZE*2)
#define TX_BUF(card, nr) ((card->buffers) + (nr)*BUF_SIZE*2 + BUF_SIZE)
static int debug = 0;
static int atmdebug = 0;
struct pkt_hdr {
__le16 size;
__le16 vpi;
__le16 vci;
__le16 type;
};
#define PKT_DATA 0
#define PKT_COMMAND 1
#define PKT_POPEN 3
#define PKT_PCLOSE 4
struct solos_card {
void __iomem *config_regs;
void __iomem *buffers;
int nr_ports;
struct pci_dev *dev;
struct atm_dev *atmdev[4];
struct tasklet_struct tlet;
spinlock_t tx_lock;
spinlock_t tx_queue_lock;
spinlock_t cli_queue_lock;
struct sk_buff_head tx_queue[4];
struct sk_buff_head cli_queue[4];
};
#define SOLOS_CHAN(atmdev) ((int)(unsigned long)(atmdev)->phy_data)
MODULE_AUTHOR("Traverse Technologies <support@traverse.com.au>");
MODULE_DESCRIPTION("Solos PCI driver");
MODULE_VERSION(VERSION);
MODULE_LICENSE("GPL");
MODULE_PARM_DESC(debug, "Enable Loopback");
MODULE_PARM_DESC(atmdebug, "Print ATM data");
module_param(debug, int, 0444);
module_param(atmdebug, int, 0444);
static int opens;
static void fpga_queue(struct solos_card *card, int port, struct sk_buff *skb,
struct atm_vcc *vcc);
static int fpga_tx(struct solos_card *);
static irqreturn_t solos_irq(int irq, void *dev_id);
static struct atm_vcc* find_vcc(struct atm_dev *dev, short vpi, int vci);
static int list_vccs(int vci);
static int atm_init(struct solos_card *);
static void atm_remove(struct solos_card *);
static int send_command(struct solos_card *card, int dev, const char *buf, size_t size);
static void solos_bh(unsigned long);
static int print_buffer(struct sk_buff *buf);
static inline void solos_pop(struct atm_vcc *vcc, struct sk_buff *skb)
{
if (vcc->pop)
vcc->pop(vcc, skb);
else
dev_kfree_skb_any(skb);
}
static ssize_t console_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct atm_dev *atmdev = container_of(dev, struct atm_dev, class_dev);
struct solos_card *card = atmdev->dev_data;
struct sk_buff *skb;
spin_lock(&card->cli_queue_lock);
skb = skb_dequeue(&card->cli_queue[SOLOS_CHAN(atmdev)]);
spin_unlock(&card->cli_queue_lock);
if(skb == NULL)
return sprintf(buf, "No data.\n");
memcpy(buf, skb->data, skb->len);
dev_dbg(&card->dev->dev, "len: %d\n", skb->len);
kfree_skb(skb);
return skb->len;
}
static int send_command(struct solos_card *card, int dev, const char *buf, size_t size)
{
struct sk_buff *skb;
struct pkt_hdr *header;
// dev_dbg(&card->dev->dev, "size: %d\n", size);
if (size > (BUF_SIZE - sizeof(*header))) {
dev_dbg(&card->dev->dev, "Command is too big. Dropping request\n");
return 0;
}
skb = alloc_skb(size + sizeof(*header), GFP_ATOMIC);
if (!skb) {
dev_warn(&card->dev->dev, "Failed to allocate sk_buff in send_command()\n");
return 0;
}
header = (void *)skb_put(skb, sizeof(*header));
header->size = cpu_to_le16(size);
header->vpi = cpu_to_le16(0);
header->vci = cpu_to_le16(0);
header->type = cpu_to_le16(PKT_COMMAND);
memcpy(skb_put(skb, size), buf, size);
fpga_queue(card, dev, skb, NULL);
return 0;
}
static ssize_t console_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct atm_dev *atmdev = container_of(dev, struct atm_dev, class_dev);
struct solos_card *card = atmdev->dev_data;
int err;
err = send_command(card, SOLOS_CHAN(atmdev), buf, count);
return err?:count;
}
static DEVICE_ATTR(console, 0644, console_show, console_store);
static irqreturn_t solos_irq(int irq, void *dev_id)
{
struct solos_card *card = dev_id;
int handled = 1;
//ACK IRQ
iowrite32(0, card->config_regs + IRQ_CLEAR);
//Disable IRQs from FPGA
iowrite32(0, card->config_regs + IRQ_EN_ADDR);
/* If we only do it when the device is open, we lose console
messages */
if (1 || opens)
tasklet_schedule(&card->tlet);
//Enable IRQs from FPGA
iowrite32(1, card->config_regs + IRQ_EN_ADDR);
return IRQ_RETVAL(handled);
}
void solos_bh(unsigned long card_arg)
{
struct solos_card *card = (void *)card_arg;
int port;
uint32_t card_flags;
uint32_t tx_mask;
uint32_t rx_done = 0;
card_flags = ioread32(card->config_regs + FLAGS_ADDR);
/* The TX bits are set if the channel is busy; clear if not. We want to
invoke fpga_tx() unless _all_ the bits for active channels are set */
tx_mask = (1 << card->nr_ports) - 1;
if ((card_flags & tx_mask) != tx_mask)
fpga_tx(card);
for (port = 0; port < card->nr_ports; port++) {
if (card_flags & (0x10 << port)) {
struct pkt_hdr header;
struct sk_buff *skb;
struct atm_vcc *vcc;
int size;
rx_done |= 0x10 << port;
memcpy_fromio(&header, RX_BUF(card, port), sizeof(header));
size = le16_to_cpu(header.size);
skb = alloc_skb(size, GFP_ATOMIC);
if (!skb) {
if (net_ratelimit())
dev_warn(&card->dev->dev, "Failed to allocate sk_buff for RX\n");
continue;
}
memcpy_fromio(skb_put(skb, size),
RX_BUF(card, port) + sizeof(header),
size);
if (atmdebug) {
dev_info(&card->dev->dev, "Received: device %d\n", port);
dev_info(&card->dev->dev, "size: %d VPI: %d VCI: %d\n",
size, le16_to_cpu(header.vpi),
le16_to_cpu(header.vci));
print_buffer(skb);
}
switch (le16_to_cpu(header.type)) {
case PKT_DATA:
vcc = find_vcc(card->atmdev[port], le16_to_cpu(header.vpi),
le16_to_cpu(header.vci));
if (!vcc) {
if (net_ratelimit())
dev_warn(&card->dev->dev, "Received packet for unknown VCI.VPI %d.%d on port %d\n",
le16_to_cpu(header.vci), le16_to_cpu(header.vpi),
port);
continue;
}
atm_charge(vcc, skb->truesize);
vcc->push(vcc, skb);
atomic_inc(&vcc->stats->rx);
break;
case PKT_COMMAND:
default: /* FIXME: Not really, surely? */
spin_lock(&card->cli_queue_lock);
if (skb_queue_len(&card->cli_queue[port]) > 10) {
if (net_ratelimit())
dev_warn(&card->dev->dev, "Dropping console response on port %d\n",
port);
} else
skb_queue_tail(&card->cli_queue[port], skb);
spin_unlock(&card->cli_queue_lock);
break;
}
}
}
if (rx_done)
iowrite32(rx_done, card->config_regs + FLAGS_ADDR);
return;
}
static struct atm_vcc *find_vcc(struct atm_dev *dev, short vpi, int vci)
{
struct hlist_head *head;
struct atm_vcc *vcc = NULL;
struct hlist_node *node;
struct sock *s;
read_lock(&vcc_sklist_lock);
head = &vcc_hash[vci & (VCC_HTABLE_SIZE -1)];
sk_for_each(s, node, head) {
vcc = atm_sk(s);
if (vcc->dev == dev && vcc->vci == vci &&
vcc->vpi == vpi && vcc->qos.rxtp.traffic_class != ATM_NONE)
goto out;
}
vcc = NULL;
out:
read_unlock(&vcc_sklist_lock);
return vcc;
}
static int list_vccs(int vci)
{
struct hlist_head *head;
struct atm_vcc *vcc;
struct hlist_node *node;
struct sock *s;
int num_found = 0;
int i;
read_lock(&vcc_sklist_lock);
if (vci != 0){
head = &vcc_hash[vci & (VCC_HTABLE_SIZE -1)];
sk_for_each(s, node, head) {
num_found ++;
vcc = atm_sk(s);
printk(KERN_DEBUG "Device: %d Vpi: %d Vci: %d\n",
vcc->dev->number,
vcc->vpi,
vcc->vci);
}
} else {
for(i=0; i<32; i++){
head = &vcc_hash[i];
sk_for_each(s, node, head) {
num_found ++;
vcc = atm_sk(s);
printk(KERN_DEBUG "Device: %d Vpi: %d Vci: %d\n",
vcc->dev->number,
vcc->vpi,
vcc->vci);
}
}
}
read_unlock(&vcc_sklist_lock);
return num_found;
}
static int popen(struct atm_vcc *vcc)
{
struct solos_card *card = vcc->dev->dev_data;
struct sk_buff *skb;
struct pkt_hdr *header;
skb = alloc_skb(sizeof(*header), GFP_ATOMIC);
if (!skb && net_ratelimit()) {
dev_warn(&card->dev->dev, "Failed to allocate sk_buff in popen()\n");
return -ENOMEM;
}
header = (void *)skb_put(skb, sizeof(*header));
header->size = cpu_to_le16(sizeof(*header));
header->vpi = cpu_to_le16(vcc->vpi);
header->vci = cpu_to_le16(vcc->vci);
header->type = cpu_to_le16(PKT_POPEN);
fpga_queue(card, SOLOS_CHAN(vcc->dev), skb, NULL);
// dev_dbg(&card->dev->dev, "Open for vpi %d and vci %d on interface %d\n", vcc->vpi, vcc->vci, SOLOS_CHAN(vcc->dev));
set_bit(ATM_VF_ADDR, &vcc->flags); // accept the vpi / vci
set_bit(ATM_VF_READY, &vcc->flags);
list_vccs(0);
if (!opens)
iowrite32(1, card->config_regs + IRQ_EN_ADDR);
opens++; //count open PVCs
return 0;
}
static void pclose(struct atm_vcc *vcc)
{
struct solos_card *card = vcc->dev->dev_data;
struct sk_buff *skb;
struct pkt_hdr *header;
skb = alloc_skb(sizeof(*header), GFP_ATOMIC);
if (!skb) {
dev_warn(&card->dev->dev, "Failed to allocate sk_buff in pclose()\n");
return;
}
header = (void *)skb_put(skb, sizeof(*header));
header->size = cpu_to_le16(sizeof(*header));
header->vpi = cpu_to_le16(vcc->vpi);
header->vci = cpu_to_le16(vcc->vci);
header->type = cpu_to_le16(PKT_PCLOSE);
fpga_queue(card, SOLOS_CHAN(vcc->dev), skb, NULL);
// dev_dbg(&card->dev->dev, "Close for vpi %d and vci %d on interface %d\n", vcc->vpi, vcc->vci, SOLOS_CHAN(vcc->dev));
if (!--opens)
iowrite32(0, card->config_regs + IRQ_EN_ADDR);
clear_bit(ATM_VF_ADDR, &vcc->flags);
clear_bit(ATM_VF_READY, &vcc->flags);
return;
}
static int print_buffer(struct sk_buff *buf)
{
int len,i;
char msg[500];
char item[10];
len = buf->len;
for (i = 0; i < len; i++){
if(i % 8 == 0)
sprintf(msg, "%02X: ", i);
sprintf(item,"%02X ",*(buf->data + i));
strcat(msg, item);
if(i % 8 == 7) {
sprintf(item, "\n");
strcat(msg, item);
printk(KERN_DEBUG "%s", msg);
}
}
if (i % 8 != 0) {
sprintf(item, "\n");
strcat(msg, item);
printk(KERN_DEBUG "%s", msg);
}
printk(KERN_DEBUG "\n");
return 0;
}
static void fpga_queue(struct solos_card *card, int port, struct sk_buff *skb,
struct atm_vcc *vcc)
{
int old_len;
*(void **)skb->cb = vcc;
spin_lock(&card->tx_queue_lock);
old_len = skb_queue_len(&card->tx_queue[port]);
skb_queue_tail(&card->tx_queue[port], skb);
spin_unlock(&card->tx_queue_lock);
/* If TX might need to be started, do so */
if (!old_len)
fpga_tx(card);
}
static int fpga_tx(struct solos_card *card)
{
uint32_t tx_pending;
uint32_t tx_started = 0;
struct sk_buff *skb;
struct atm_vcc *vcc;
unsigned char port;
unsigned long flags;
spin_lock_irqsave(&card->tx_lock, flags);
tx_pending = ioread32(card->config_regs + FLAGS_ADDR);
dev_vdbg(&card->dev->dev, "TX Flags are %X\n", tx_pending);
for (port = 0; port < card->nr_ports; port++) {
if (!(tx_pending & (1 << port))) {
spin_lock(&card->tx_queue_lock);
skb = skb_dequeue(&card->tx_queue[port]);
spin_unlock(&card->tx_queue_lock);
if (!skb)
continue;
if (atmdebug) {
dev_info(&card->dev->dev, "Transmitted: port %d\n",
port);
print_buffer(skb);
}
memcpy_toio(TX_BUF(card, port), skb->data, skb->len);
vcc = *(void **)skb->cb;
if (vcc) {
atomic_inc(&vcc->stats->tx);
solos_pop(vcc, skb);
} else
dev_kfree_skb_irq(skb);
tx_started |= 1 << port; //Set TX full flag
}
}
if (tx_started)
iowrite32(tx_started, card->config_regs + FLAGS_ADDR);
spin_unlock_irqrestore(&card->tx_lock, flags);
return 0;
}
static int psend(struct atm_vcc *vcc, struct sk_buff *skb)
{
struct solos_card *card = vcc->dev->dev_data;
struct sk_buff *skb2 = NULL;
struct pkt_hdr *header;
//dev_dbg(&card->dev->dev, "psend called.\n");
//dev_dbg(&card->dev->dev, "dev,vpi,vci = %d,%d,%d\n",SOLOS_CHAN(vcc->dev),vcc->vpi,vcc->vci);
if (debug) {
skb2 = atm_alloc_charge(vcc, skb->len, GFP_ATOMIC);
if (skb2) {
memcpy(skb2->data, skb->data, skb->len);
skb_put(skb2, skb->len);
vcc->push(vcc, skb2);
atomic_inc(&vcc->stats->rx);
}
atomic_inc(&vcc->stats->tx);
solos_pop(vcc, skb);
return 0;
}
if (skb->len > (BUF_SIZE - sizeof(*header))) {
dev_warn(&card->dev->dev, "Length of PDU is too large. Dropping PDU.\n");
solos_pop(vcc, skb);
return 0;
}
if (!skb_clone_writable(skb, sizeof(*header))) {
int expand_by = 0;
int ret;
if (skb_headroom(skb) < sizeof(*header))
expand_by = sizeof(*header) - skb_headroom(skb);
ret = pskb_expand_head(skb, expand_by, 0, GFP_ATOMIC);
if (ret) {
solos_pop(vcc, skb);
return ret;
}
}
header = (void *)skb_push(skb, sizeof(*header));
header->size = cpu_to_le16(skb->len);
header->vpi = cpu_to_le16(vcc->vpi);
header->vci = cpu_to_le16(vcc->vci);
header->type = cpu_to_le16(PKT_DATA);
fpga_queue(card, SOLOS_CHAN(vcc->dev), skb, vcc);
return 0;
}
static struct atmdev_ops fpga_ops = {
.open = popen,
.close = pclose,
.ioctl = NULL,
.getsockopt = NULL,
.setsockopt = NULL,
.send = psend,
.send_oam = NULL,
.phy_put = NULL,
.phy_get = NULL,
.change_qos = NULL,
.proc_read = NULL,
.owner = THIS_MODULE
};
static int fpga_probe(struct pci_dev *dev, const struct pci_device_id *id)
{
int err, i;
uint16_t fpga_ver;
uint8_t major_ver, minor_ver;
uint32_t data32;
struct solos_card *card;
if (debug)
return 0;
card = kzalloc(sizeof(*card), GFP_KERNEL);
if (!card)
return -ENOMEM;
card->dev = dev;
err = pci_enable_device(dev);
if (err) {
dev_warn(&dev->dev, "Failed to enable PCI device\n");
goto out;
}
err = pci_request_regions(dev, "solos");
if (err) {
dev_warn(&dev->dev, "Failed to request regions\n");
goto out;
}
card->config_regs = pci_iomap(dev, 0, CONFIG_RAM_SIZE);
if (!card->config_regs) {
dev_warn(&dev->dev, "Failed to ioremap config registers\n");
goto out_release_regions;
}
card->buffers = pci_iomap(dev, 1, DATA_RAM_SIZE);
if (!card->buffers) {
dev_warn(&dev->dev, "Failed to ioremap data buffers\n");
goto out_unmap_config;
}
// for(i=0;i<64 ;i+=4){
// data32=ioread32(card->buffers + i);
// dev_dbg(&card->dev->dev, "%08lX\n",(unsigned long)data32);
// }
//Fill Config Mem with zeros
for(i = 0; i < 128; i += 4)
iowrite32(0, card->config_regs + i);
//Set RX empty flags
iowrite32(0xF0, card->config_regs + FLAGS_ADDR);
data32 = ioread32(card->config_regs + FPGA_VER);
fpga_ver = (data32 & 0x0000FFFF);
major_ver = ((data32 & 0xFF000000) >> 24);
minor_ver = ((data32 & 0x00FF0000) >> 16);
dev_info(&dev->dev, "Solos FPGA Version %d.%02d svn-%d\n",
major_ver, minor_ver, fpga_ver);
card->nr_ports = 2; /* FIXME: Detect daughterboard */
err = atm_init(card);
if (err)
goto out_unmap_both;
pci_set_drvdata(dev, card);
tasklet_init(&card->tlet, solos_bh, (unsigned long)card);
spin_lock_init(&card->tx_lock);
spin_lock_init(&card->tx_queue_lock);
spin_lock_init(&card->cli_queue_lock);
/*
// Set Loopback mode
data32 = 0x00010000;
iowrite32(data32,card->config_regs + FLAGS_ADDR);
*/
/*
// Fill Buffers with zeros
for (i = 0; i < BUF_SIZE * 8; i += 4)
iowrite32(0, card->buffers + i);
*/
/*
for(i = 0; i < (BUF_SIZE * 1); i += 4)
iowrite32(0x12345678, card->buffers + i + (0*BUF_SIZE));
for(i = 0; i < (BUF_SIZE * 1); i += 4)
iowrite32(0xabcdef98, card->buffers + i + (1*BUF_SIZE));
// Read Config Memory
printk(KERN_DEBUG "Reading Config MEM\n");
i = 0;
for(i = 0; i < 16; i++) {
data32=ioread32(card->buffers + i*(BUF_SIZE/2));
printk(KERN_ALERT "Addr: %lX Data: %08lX\n",
(unsigned long)(addr_start + i*(BUF_SIZE/2)),
(unsigned long)data32);
}
*/
//dev_dbg(&card->dev->dev, "Requesting IRQ: %d\n",dev->irq);
err = request_irq(dev->irq, solos_irq, IRQF_DISABLED|IRQF_SHARED,
"solos-pci", card);
if (err)
dev_dbg(&card->dev->dev, "Failed to request interrupt IRQ: %d\n", dev->irq);
// Enable IRQs
iowrite32(1, card->config_regs + IRQ_EN_ADDR);
return 0;
out_unmap_both:
pci_iounmap(dev, card->config_regs);
out_unmap_config:
pci_iounmap(dev, card->buffers);
out_release_regions:
pci_release_regions(dev);
out:
return err;
}
static int atm_init(struct solos_card *card)
{
int i;
opens = 0;
for (i = 0; i < card->nr_ports; i++) {
skb_queue_head_init(&card->tx_queue[i]);
skb_queue_head_init(&card->cli_queue[i]);
card->atmdev[i] = atm_dev_register("solos-pci", &fpga_ops, -1, NULL);
if (!card->atmdev[i]) {
dev_err(&card->dev->dev, "Could not register ATM device %d\n", i);
atm_remove(card);
return -ENODEV;
}
if (device_create_file(&card->atmdev[i]->class_dev, &dev_attr_console))
dev_err(&card->dev->dev, "Could not register console for ATM device %d\n", i);
dev_info(&card->dev->dev, "Registered ATM device %d\n", card->atmdev[i]->number);
card->atmdev[i]->ci_range.vpi_bits = 8;
card->atmdev[i]->ci_range.vci_bits = 16;
card->atmdev[i]->dev_data = card;
card->atmdev[i]->phy_data = (void *)(unsigned long)i;
}
return 0;
}
static void atm_remove(struct solos_card *card)
{
int i;
for (i = 0; i < card->nr_ports; i++) {
if (card->atmdev[i]) {
dev_info(&card->dev->dev, "Unregistering ATM device %d\n", card->atmdev[i]->number);
atm_dev_deregister(card->atmdev[i]);
}
}
}
static void fpga_remove(struct pci_dev *dev)
{
struct solos_card *card = pci_get_drvdata(dev);
if (debug)
return;
atm_remove(card);
dev_vdbg(&dev->dev, "Freeing IRQ\n");
// Disable IRQs from FPGA
iowrite32(0, card->config_regs + IRQ_EN_ADDR);
free_irq(dev->irq, card);
tasklet_kill(&card->tlet);
// iowrite32(0x01,pciregs);
dev_vdbg(&dev->dev, "Unmapping PCI resource\n");
pci_iounmap(dev, card->buffers);
pci_iounmap(dev, card->config_regs);
dev_vdbg(&dev->dev, "Releasing PCI Region\n");
pci_release_regions(dev);
pci_disable_device(dev);
pci_set_drvdata(dev, NULL);
kfree(card);
// dev_dbg(&card->dev->dev, "fpga_remove\n");
return;
}
static struct pci_device_id fpga_pci_tbl[] __devinitdata = {
{ 0x10ee, 0x0300, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 },
{ 0, }
};
MODULE_DEVICE_TABLE(pci,fpga_pci_tbl);
static struct pci_driver fpga_driver = {
.name = "solos",
.id_table = fpga_pci_tbl,
.probe = fpga_probe,
.remove = fpga_remove,
};
static int __init solos_pci_init(void)
{
printk(KERN_INFO "Solos PCI Driver Version %s\n", VERSION);
return pci_register_driver(&fpga_driver);
}
static void __exit solos_pci_exit(void)
{
pci_unregister_driver(&fpga_driver);
printk(KERN_INFO "Solos PCI Driver %s Unloaded\n", VERSION);
}
module_init(solos_pci_init);
module_exit(solos_pci_exit);
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