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fore200e.c
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// SPDX-License-Identifier: GPL-2.0-or-later
/*
A FORE Systems 200E-series driver for ATM on Linux.
Christophe Lizzi (lizzi@cnam.fr), October 1999-March 2003.
Based on the PCA-200E driver from Uwe Dannowski (Uwe.Dannowski@inf.tu-dresden.de).
This driver simultaneously supports PCA-200E and SBA-200E adapters
on i386, alpha (untested), powerpc, sparc and sparc64 architectures.
*/
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/capability.h>
#include <linux/interrupt.h>
#include <linux/bitops.h>
#include <linux/pci.h>
#include <linux/module.h>
#include <linux/atmdev.h>
#include <linux/sonet.h>
#include <linux/dma-mapping.h>
#include <linux/delay.h>
#include <linux/firmware.h>
#include <linux/pgtable.h>
#include <asm/io.h>
#include <asm/string.h>
#include <asm/page.h>
#include <asm/irq.h>
#include <asm/dma.h>
#include <asm/byteorder.h>
#include <linux/uaccess.h>
#include <linux/atomic.h>
#ifdef CONFIG_SBUS
#include <linux/of.h>
#include <linux/platform_device.h>
#include <asm/idprom.h>
#include <asm/openprom.h>
#include <asm/oplib.h>
#endif
#if defined(CONFIG_ATM_FORE200E_USE_TASKLET) /* defer interrupt work to a tasklet */
#define FORE200E_USE_TASKLET
#endif
#if 0 /* enable the debugging code of the buffer supply queues */
#define FORE200E_BSQ_DEBUG
#endif
#if 1 /* ensure correct handling of 52-byte AAL0 SDUs expected by atmdump-like apps */
#define FORE200E_52BYTE_AAL0_SDU
#endif
#include "fore200e.h"
#include "suni.h"
#define FORE200E_VERSION "0.3e"
#define FORE200E "fore200e: "
#if 0 /* override .config */
#define CONFIG_ATM_FORE200E_DEBUG 1
#endif
#if defined(CONFIG_ATM_FORE200E_DEBUG) && (CONFIG_ATM_FORE200E_DEBUG > 0)
#define DPRINTK(level, format, args...) do { if (CONFIG_ATM_FORE200E_DEBUG >= (level)) \
printk(FORE200E format, ##args); } while (0)
#else
#define DPRINTK(level, format, args...) do {} while (0)
#endif
#define FORE200E_ALIGN(addr, alignment) \
((((unsigned long)(addr) + (alignment - 1)) & ~(alignment - 1)) - (unsigned long)(addr))
#define FORE200E_DMA_INDEX(dma_addr, type, index) ((dma_addr) + (index) * sizeof(type))
#define FORE200E_INDEX(virt_addr, type, index) (&((type *)(virt_addr))[ index ])
#define FORE200E_NEXT_ENTRY(index, modulo) (index = ((index) + 1) % (modulo))
#if 1
#define ASSERT(expr) if (!(expr)) { \
printk(FORE200E "assertion failed! %s[%d]: %s\n", \
__func__, __LINE__, #expr); \
panic(FORE200E "%s", __func__); \
}
#else
#define ASSERT(expr) do {} while (0)
#endif
static const struct atmdev_ops fore200e_ops;
static LIST_HEAD(fore200e_boards);
MODULE_AUTHOR("Christophe Lizzi - credits to Uwe Dannowski and Heikki Vatiainen");
MODULE_DESCRIPTION("FORE Systems 200E-series ATM driver - version " FORE200E_VERSION);
static const int fore200e_rx_buf_nbr[ BUFFER_SCHEME_NBR ][ BUFFER_MAGN_NBR ] = {
{ BUFFER_S1_NBR, BUFFER_L1_NBR },
{ BUFFER_S2_NBR, BUFFER_L2_NBR }
};
static const int fore200e_rx_buf_size[ BUFFER_SCHEME_NBR ][ BUFFER_MAGN_NBR ] = {
{ BUFFER_S1_SIZE, BUFFER_L1_SIZE },
{ BUFFER_S2_SIZE, BUFFER_L2_SIZE }
};
#if defined(CONFIG_ATM_FORE200E_DEBUG) && (CONFIG_ATM_FORE200E_DEBUG > 0)
static const char* fore200e_traffic_class[] = { "NONE", "UBR", "CBR", "VBR", "ABR", "ANY" };
#endif
#if 0 /* currently unused */
static int
fore200e_fore2atm_aal(enum fore200e_aal aal)
{
switch(aal) {
case FORE200E_AAL0: return ATM_AAL0;
case FORE200E_AAL34: return ATM_AAL34;
case FORE200E_AAL5: return ATM_AAL5;
}
return -EINVAL;
}
#endif
static enum fore200e_aal
fore200e_atm2fore_aal(int aal)
{
switch(aal) {
case ATM_AAL0: return FORE200E_AAL0;
case ATM_AAL34: return FORE200E_AAL34;
case ATM_AAL1:
case ATM_AAL2:
case ATM_AAL5: return FORE200E_AAL5;
}
return -EINVAL;
}
static char*
fore200e_irq_itoa(int irq)
{
static char str[8];
sprintf(str, "%d", irq);
return str;
}
/* allocate and align a chunk of memory intended to hold the data behing exchanged
between the driver and the adapter (using streaming DVMA) */
static int
fore200e_chunk_alloc(struct fore200e* fore200e, struct chunk* chunk, int size, int alignment, int direction)
{
unsigned long offset = 0;
if (alignment <= sizeof(int))
alignment = 0;
chunk->alloc_size = size + alignment;
chunk->direction = direction;
chunk->alloc_addr = kzalloc(chunk->alloc_size, GFP_KERNEL);
if (chunk->alloc_addr == NULL)
return -ENOMEM;
if (alignment > 0)
offset = FORE200E_ALIGN(chunk->alloc_addr, alignment);
chunk->align_addr = chunk->alloc_addr + offset;
chunk->dma_addr = dma_map_single(fore200e->dev, chunk->align_addr,
size, direction);
if (dma_mapping_error(fore200e->dev, chunk->dma_addr)) {
kfree(chunk->alloc_addr);
return -ENOMEM;
}
return 0;
}
/* free a chunk of memory */
static void
fore200e_chunk_free(struct fore200e* fore200e, struct chunk* chunk)
{
dma_unmap_single(fore200e->dev, chunk->dma_addr, chunk->dma_size,
chunk->direction);
kfree(chunk->alloc_addr);
}
/*
* Allocate a DMA consistent chunk of memory intended to act as a communication
* mechanism (to hold descriptors, status, queues, etc.) shared by the driver
* and the adapter.
*/
static int
fore200e_dma_chunk_alloc(struct fore200e *fore200e, struct chunk *chunk,
int size, int nbr, int alignment)
{
/* returned chunks are page-aligned */
chunk->alloc_size = size * nbr;
chunk->alloc_addr = dma_alloc_coherent(fore200e->dev, chunk->alloc_size,
&chunk->dma_addr, GFP_KERNEL);
if (!chunk->alloc_addr)
return -ENOMEM;
chunk->align_addr = chunk->alloc_addr;
return 0;
}
/*
* Free a DMA consistent chunk of memory.
*/
static void
fore200e_dma_chunk_free(struct fore200e* fore200e, struct chunk* chunk)
{
dma_free_coherent(fore200e->dev, chunk->alloc_size, chunk->alloc_addr,
chunk->dma_addr);
}
static void
fore200e_spin(int msecs)
{
unsigned long timeout = jiffies + msecs_to_jiffies(msecs);
while (time_before(jiffies, timeout));
}
static int
fore200e_poll(struct fore200e* fore200e, volatile u32* addr, u32 val, int msecs)
{
unsigned long timeout = jiffies + msecs_to_jiffies(msecs);
int ok;
mb();
do {
if ((ok = (*addr == val)) || (*addr & STATUS_ERROR))
break;
} while (time_before(jiffies, timeout));
#if 1
if (!ok) {
printk(FORE200E "cmd polling failed, got status 0x%08x, expected 0x%08x\n",
*addr, val);
}
#endif
return ok;
}
static int
fore200e_io_poll(struct fore200e* fore200e, volatile u32 __iomem *addr, u32 val, int msecs)
{
unsigned long timeout = jiffies + msecs_to_jiffies(msecs);
int ok;
do {
if ((ok = (fore200e->bus->read(addr) == val)))
break;
} while (time_before(jiffies, timeout));
#if 1
if (!ok) {
printk(FORE200E "I/O polling failed, got status 0x%08x, expected 0x%08x\n",
fore200e->bus->read(addr), val);
}
#endif
return ok;
}
static void
fore200e_free_rx_buf(struct fore200e* fore200e)
{
int scheme, magn, nbr;
struct buffer* buffer;
for (scheme = 0; scheme < BUFFER_SCHEME_NBR; scheme++) {
for (magn = 0; magn < BUFFER_MAGN_NBR; magn++) {
if ((buffer = fore200e->host_bsq[ scheme ][ magn ].buffer) != NULL) {
for (nbr = 0; nbr < fore200e_rx_buf_nbr[ scheme ][ magn ]; nbr++) {
struct chunk* data = &buffer[ nbr ].data;
if (data->alloc_addr != NULL)
fore200e_chunk_free(fore200e, data);
}
}
}
}
}
static void
fore200e_uninit_bs_queue(struct fore200e* fore200e)
{
int scheme, magn;
for (scheme = 0; scheme < BUFFER_SCHEME_NBR; scheme++) {
for (magn = 0; magn < BUFFER_MAGN_NBR; magn++) {
struct chunk* status = &fore200e->host_bsq[ scheme ][ magn ].status;
struct chunk* rbd_block = &fore200e->host_bsq[ scheme ][ magn ].rbd_block;
if (status->alloc_addr)
fore200e_dma_chunk_free(fore200e, status);
if (rbd_block->alloc_addr)
fore200e_dma_chunk_free(fore200e, rbd_block);
}
}
}
static int
fore200e_reset(struct fore200e* fore200e, int diag)
{
int ok;
fore200e->cp_monitor = fore200e->virt_base + FORE200E_CP_MONITOR_OFFSET;
fore200e->bus->write(BSTAT_COLD_START, &fore200e->cp_monitor->bstat);
fore200e->bus->reset(fore200e);
if (diag) {
ok = fore200e_io_poll(fore200e, &fore200e->cp_monitor->bstat, BSTAT_SELFTEST_OK, 1000);
if (ok == 0) {
printk(FORE200E "device %s self-test failed\n", fore200e->name);
return -ENODEV;
}
printk(FORE200E "device %s self-test passed\n", fore200e->name);
fore200e->state = FORE200E_STATE_RESET;
}
return 0;
}
static void
fore200e_shutdown(struct fore200e* fore200e)
{
printk(FORE200E "removing device %s at 0x%lx, IRQ %s\n",
fore200e->name, fore200e->phys_base,
fore200e_irq_itoa(fore200e->irq));
if (fore200e->state > FORE200E_STATE_RESET) {
/* first, reset the board to prevent further interrupts or data transfers */
fore200e_reset(fore200e, 0);
}
/* then, release all allocated resources */
switch(fore200e->state) {
case FORE200E_STATE_COMPLETE:
kfree(fore200e->stats);
fallthrough;
case FORE200E_STATE_IRQ:
free_irq(fore200e->irq, fore200e->atm_dev);
fallthrough;
case FORE200E_STATE_ALLOC_BUF:
fore200e_free_rx_buf(fore200e);
fallthrough;
case FORE200E_STATE_INIT_BSQ:
fore200e_uninit_bs_queue(fore200e);
fallthrough;
case FORE200E_STATE_INIT_RXQ:
fore200e_dma_chunk_free(fore200e, &fore200e->host_rxq.status);
fore200e_dma_chunk_free(fore200e, &fore200e->host_rxq.rpd);
fallthrough;
case FORE200E_STATE_INIT_TXQ:
fore200e_dma_chunk_free(fore200e, &fore200e->host_txq.status);
fore200e_dma_chunk_free(fore200e, &fore200e->host_txq.tpd);
fallthrough;
case FORE200E_STATE_INIT_CMDQ:
fore200e_dma_chunk_free(fore200e, &fore200e->host_cmdq.status);
fallthrough;
case FORE200E_STATE_INITIALIZE:
/* nothing to do for that state */
case FORE200E_STATE_START_FW:
/* nothing to do for that state */
case FORE200E_STATE_RESET:
/* nothing to do for that state */
case FORE200E_STATE_MAP:
fore200e->bus->unmap(fore200e);
fallthrough;
case FORE200E_STATE_CONFIGURE:
/* nothing to do for that state */
case FORE200E_STATE_REGISTER:
/* XXX shouldn't we *start* by deregistering the device? */
atm_dev_deregister(fore200e->atm_dev);
fallthrough;
case FORE200E_STATE_BLANK:
/* nothing to do for that state */
break;
}
}
#ifdef CONFIG_PCI
static u32 fore200e_pca_read(volatile u32 __iomem *addr)
{
/* on big-endian hosts, the board is configured to convert
the endianess of slave RAM accesses */
return le32_to_cpu(readl(addr));
}
static void fore200e_pca_write(u32 val, volatile u32 __iomem *addr)
{
/* on big-endian hosts, the board is configured to convert
the endianess of slave RAM accesses */
writel(cpu_to_le32(val), addr);
}
static int
fore200e_pca_irq_check(struct fore200e* fore200e)
{
/* this is a 1 bit register */
int irq_posted = readl(fore200e->regs.pca.psr);
#if defined(CONFIG_ATM_FORE200E_DEBUG) && (CONFIG_ATM_FORE200E_DEBUG == 2)
if (irq_posted && (readl(fore200e->regs.pca.hcr) & PCA200E_HCR_OUTFULL)) {
DPRINTK(2,"FIFO OUT full, device %d\n", fore200e->atm_dev->number);
}
#endif
return irq_posted;
}
static void
fore200e_pca_irq_ack(struct fore200e* fore200e)
{
writel(PCA200E_HCR_CLRINTR, fore200e->regs.pca.hcr);
}
static void
fore200e_pca_reset(struct fore200e* fore200e)
{
writel(PCA200E_HCR_RESET, fore200e->regs.pca.hcr);
fore200e_spin(10);
writel(0, fore200e->regs.pca.hcr);
}
static int fore200e_pca_map(struct fore200e* fore200e)
{
DPRINTK(2, "device %s being mapped in memory\n", fore200e->name);
fore200e->virt_base = ioremap(fore200e->phys_base, PCA200E_IOSPACE_LENGTH);
if (fore200e->virt_base == NULL) {
printk(FORE200E "can't map device %s\n", fore200e->name);
return -EFAULT;
}
DPRINTK(1, "device %s mapped to 0x%p\n", fore200e->name, fore200e->virt_base);
/* gain access to the PCA specific registers */
fore200e->regs.pca.hcr = fore200e->virt_base + PCA200E_HCR_OFFSET;
fore200e->regs.pca.imr = fore200e->virt_base + PCA200E_IMR_OFFSET;
fore200e->regs.pca.psr = fore200e->virt_base + PCA200E_PSR_OFFSET;
fore200e->state = FORE200E_STATE_MAP;
return 0;
}
static void
fore200e_pca_unmap(struct fore200e* fore200e)
{
DPRINTK(2, "device %s being unmapped from memory\n", fore200e->name);
if (fore200e->virt_base != NULL)
iounmap(fore200e->virt_base);
}
static int fore200e_pca_configure(struct fore200e *fore200e)
{
struct pci_dev *pci_dev = to_pci_dev(fore200e->dev);
u8 master_ctrl, latency;
DPRINTK(2, "device %s being configured\n", fore200e->name);
if ((pci_dev->irq == 0) || (pci_dev->irq == 0xFF)) {
printk(FORE200E "incorrect IRQ setting - misconfigured PCI-PCI bridge?\n");
return -EIO;
}
pci_read_config_byte(pci_dev, PCA200E_PCI_MASTER_CTRL, &master_ctrl);
master_ctrl = master_ctrl
#if defined(__BIG_ENDIAN)
/* request the PCA board to convert the endianess of slave RAM accesses */
| PCA200E_CTRL_CONVERT_ENDIAN
#endif
#if 0
| PCA200E_CTRL_DIS_CACHE_RD
| PCA200E_CTRL_DIS_WRT_INVAL
| PCA200E_CTRL_ENA_CONT_REQ_MODE
| PCA200E_CTRL_2_CACHE_WRT_INVAL
#endif
| PCA200E_CTRL_LARGE_PCI_BURSTS;
pci_write_config_byte(pci_dev, PCA200E_PCI_MASTER_CTRL, master_ctrl);
/* raise latency from 32 (default) to 192, as this seems to prevent NIC
lockups (under heavy rx loads) due to continuous 'FIFO OUT full' condition.
this may impact the performances of other PCI devices on the same bus, though */
latency = 192;
pci_write_config_byte(pci_dev, PCI_LATENCY_TIMER, latency);
fore200e->state = FORE200E_STATE_CONFIGURE;
return 0;
}
static int __init
fore200e_pca_prom_read(struct fore200e* fore200e, struct prom_data* prom)
{
struct host_cmdq* cmdq = &fore200e->host_cmdq;
struct host_cmdq_entry* entry = &cmdq->host_entry[ cmdq->head ];
struct prom_opcode opcode;
int ok;
u32 prom_dma;
FORE200E_NEXT_ENTRY(cmdq->head, QUEUE_SIZE_CMD);
opcode.opcode = OPCODE_GET_PROM;
opcode.pad = 0;
prom_dma = dma_map_single(fore200e->dev, prom, sizeof(struct prom_data),
DMA_FROM_DEVICE);
if (dma_mapping_error(fore200e->dev, prom_dma))
return -ENOMEM;
fore200e->bus->write(prom_dma, &entry->cp_entry->cmd.prom_block.prom_haddr);
*entry->status = STATUS_PENDING;
fore200e->bus->write(*(u32*)&opcode, (u32 __iomem *)&entry->cp_entry->cmd.prom_block.opcode);
ok = fore200e_poll(fore200e, entry->status, STATUS_COMPLETE, 400);
*entry->status = STATUS_FREE;
dma_unmap_single(fore200e->dev, prom_dma, sizeof(struct prom_data), DMA_FROM_DEVICE);
if (ok == 0) {
printk(FORE200E "unable to get PROM data from device %s\n", fore200e->name);
return -EIO;
}
#if defined(__BIG_ENDIAN)
#define swap_here(addr) (*((u32*)(addr)) = swab32( *((u32*)(addr)) ))
/* MAC address is stored as little-endian */
swap_here(&prom->mac_addr[0]);
swap_here(&prom->mac_addr[4]);
#endif
return 0;
}
static int
fore200e_pca_proc_read(struct fore200e* fore200e, char *page)
{
struct pci_dev *pci_dev = to_pci_dev(fore200e->dev);
return sprintf(page, " PCI bus/slot/function:\t%d/%d/%d\n",
pci_dev->bus->number, PCI_SLOT(pci_dev->devfn), PCI_FUNC(pci_dev->devfn));
}
static const struct fore200e_bus fore200e_pci_ops = {
.model_name = "PCA-200E",
.proc_name = "pca200e",
.descr_alignment = 32,
.buffer_alignment = 4,
.status_alignment = 32,
.read = fore200e_pca_read,
.write = fore200e_pca_write,
.configure = fore200e_pca_configure,
.map = fore200e_pca_map,
.reset = fore200e_pca_reset,
.prom_read = fore200e_pca_prom_read,
.unmap = fore200e_pca_unmap,
.irq_check = fore200e_pca_irq_check,
.irq_ack = fore200e_pca_irq_ack,
.proc_read = fore200e_pca_proc_read,
};
#endif /* CONFIG_PCI */
#ifdef CONFIG_SBUS
static u32 fore200e_sba_read(volatile u32 __iomem *addr)
{
return sbus_readl(addr);
}
static void fore200e_sba_write(u32 val, volatile u32 __iomem *addr)
{
sbus_writel(val, addr);
}
static void fore200e_sba_irq_enable(struct fore200e *fore200e)
{
u32 hcr = fore200e->bus->read(fore200e->regs.sba.hcr) & SBA200E_HCR_STICKY;
fore200e->bus->write(hcr | SBA200E_HCR_INTR_ENA, fore200e->regs.sba.hcr);
}
static int fore200e_sba_irq_check(struct fore200e *fore200e)
{
return fore200e->bus->read(fore200e->regs.sba.hcr) & SBA200E_HCR_INTR_REQ;
}
static void fore200e_sba_irq_ack(struct fore200e *fore200e)
{
u32 hcr = fore200e->bus->read(fore200e->regs.sba.hcr) & SBA200E_HCR_STICKY;
fore200e->bus->write(hcr | SBA200E_HCR_INTR_CLR, fore200e->regs.sba.hcr);
}
static void fore200e_sba_reset(struct fore200e *fore200e)
{
fore200e->bus->write(SBA200E_HCR_RESET, fore200e->regs.sba.hcr);
fore200e_spin(10);
fore200e->bus->write(0, fore200e->regs.sba.hcr);
}
static int __init fore200e_sba_map(struct fore200e *fore200e)
{
struct platform_device *op = to_platform_device(fore200e->dev);
unsigned int bursts;
/* gain access to the SBA specific registers */
fore200e->regs.sba.hcr = of_ioremap(&op->resource[0], 0, SBA200E_HCR_LENGTH, "SBA HCR");
fore200e->regs.sba.bsr = of_ioremap(&op->resource[1], 0, SBA200E_BSR_LENGTH, "SBA BSR");
fore200e->regs.sba.isr = of_ioremap(&op->resource[2], 0, SBA200E_ISR_LENGTH, "SBA ISR");
fore200e->virt_base = of_ioremap(&op->resource[3], 0, SBA200E_RAM_LENGTH, "SBA RAM");
if (!fore200e->virt_base) {
printk(FORE200E "unable to map RAM of device %s\n", fore200e->name);
return -EFAULT;
}
DPRINTK(1, "device %s mapped to 0x%p\n", fore200e->name, fore200e->virt_base);
fore200e->bus->write(0x02, fore200e->regs.sba.isr); /* XXX hardwired interrupt level */
/* get the supported DVMA burst sizes */
bursts = of_getintprop_default(op->dev.of_node->parent, "burst-sizes", 0x00);
if (sbus_can_dma_64bit())
sbus_set_sbus64(&op->dev, bursts);
fore200e->state = FORE200E_STATE_MAP;
return 0;
}
static void fore200e_sba_unmap(struct fore200e *fore200e)
{
struct platform_device *op = to_platform_device(fore200e->dev);
of_iounmap(&op->resource[0], fore200e->regs.sba.hcr, SBA200E_HCR_LENGTH);
of_iounmap(&op->resource[1], fore200e->regs.sba.bsr, SBA200E_BSR_LENGTH);
of_iounmap(&op->resource[2], fore200e->regs.sba.isr, SBA200E_ISR_LENGTH);
of_iounmap(&op->resource[3], fore200e->virt_base, SBA200E_RAM_LENGTH);
}
static int __init fore200e_sba_configure(struct fore200e *fore200e)
{
fore200e->state = FORE200E_STATE_CONFIGURE;
return 0;
}
static int __init fore200e_sba_prom_read(struct fore200e *fore200e, struct prom_data *prom)
{
struct platform_device *op = to_platform_device(fore200e->dev);
const u8 *prop;
int len;
prop = of_get_property(op->dev.of_node, "madaddrlo2", &len);
if (!prop)
return -ENODEV;
memcpy(&prom->mac_addr[4], prop, 4);
prop = of_get_property(op->dev.of_node, "madaddrhi4", &len);
if (!prop)
return -ENODEV;
memcpy(&prom->mac_addr[2], prop, 4);
prom->serial_number = of_getintprop_default(op->dev.of_node,
"serialnumber", 0);
prom->hw_revision = of_getintprop_default(op->dev.of_node,
"promversion", 0);
return 0;
}
static int fore200e_sba_proc_read(struct fore200e *fore200e, char *page)
{
struct platform_device *op = to_platform_device(fore200e->dev);
const struct linux_prom_registers *regs;
regs = of_get_property(op->dev.of_node, "reg", NULL);
return sprintf(page, " SBUS slot/device:\t\t%d/'%pOFn'\n",
(regs ? regs->which_io : 0), op->dev.of_node);
}
static const struct fore200e_bus fore200e_sbus_ops = {
.model_name = "SBA-200E",
.proc_name = "sba200e",
.descr_alignment = 32,
.buffer_alignment = 64,
.status_alignment = 32,
.read = fore200e_sba_read,
.write = fore200e_sba_write,
.configure = fore200e_sba_configure,
.map = fore200e_sba_map,
.reset = fore200e_sba_reset,
.prom_read = fore200e_sba_prom_read,
.unmap = fore200e_sba_unmap,
.irq_enable = fore200e_sba_irq_enable,
.irq_check = fore200e_sba_irq_check,
.irq_ack = fore200e_sba_irq_ack,
.proc_read = fore200e_sba_proc_read,
};
#endif /* CONFIG_SBUS */
static void
fore200e_tx_irq(struct fore200e* fore200e)
{
struct host_txq* txq = &fore200e->host_txq;
struct host_txq_entry* entry;
struct atm_vcc* vcc;
struct fore200e_vc_map* vc_map;
if (fore200e->host_txq.txing == 0)
return;
for (;;) {
entry = &txq->host_entry[ txq->tail ];
if ((*entry->status & STATUS_COMPLETE) == 0) {
break;
}
DPRINTK(3, "TX COMPLETED: entry = %p [tail = %d], vc_map = %p, skb = %p\n",
entry, txq->tail, entry->vc_map, entry->skb);
/* free copy of misaligned data */
kfree(entry->data);
/* remove DMA mapping */
dma_unmap_single(fore200e->dev, entry->tpd->tsd[ 0 ].buffer, entry->tpd->tsd[ 0 ].length,
DMA_TO_DEVICE);
vc_map = entry->vc_map;
/* vcc closed since the time the entry was submitted for tx? */
if ((vc_map->vcc == NULL) ||
(test_bit(ATM_VF_READY, &vc_map->vcc->flags) == 0)) {
DPRINTK(1, "no ready vcc found for PDU sent on device %d\n",
fore200e->atm_dev->number);
dev_kfree_skb_any(entry->skb);
}
else {
ASSERT(vc_map->vcc);
/* vcc closed then immediately re-opened? */
if (vc_map->incarn != entry->incarn) {
/* when a vcc is closed, some PDUs may be still pending in the tx queue.
if the same vcc is immediately re-opened, those pending PDUs must
not be popped after the completion of their emission, as they refer
to the prior incarnation of that vcc. otherwise, sk_atm(vcc)->sk_wmem_alloc
would be decremented by the size of the (unrelated) skb, possibly
leading to a negative sk->sk_wmem_alloc count, ultimately freezing the vcc.
we thus bind the tx entry to the current incarnation of the vcc
when the entry is submitted for tx. When the tx later completes,
if the incarnation number of the tx entry does not match the one
of the vcc, then this implies that the vcc has been closed then re-opened.
we thus just drop the skb here. */
DPRINTK(1, "vcc closed-then-re-opened; dropping PDU sent on device %d\n",
fore200e->atm_dev->number);
dev_kfree_skb_any(entry->skb);
}
else {
vcc = vc_map->vcc;
ASSERT(vcc);
/* notify tx completion */
if (vcc->pop) {
vcc->pop(vcc, entry->skb);
}
else {
dev_kfree_skb_any(entry->skb);
}
/* check error condition */
if (*entry->status & STATUS_ERROR)
atomic_inc(&vcc->stats->tx_err);
else
atomic_inc(&vcc->stats->tx);
}
}
*entry->status = STATUS_FREE;
fore200e->host_txq.txing--;
FORE200E_NEXT_ENTRY(txq->tail, QUEUE_SIZE_TX);
}
}
#ifdef FORE200E_BSQ_DEBUG
int bsq_audit(int where, struct host_bsq* bsq, int scheme, int magn)
{
struct buffer* buffer;
int count = 0;
buffer = bsq->freebuf;
while (buffer) {
if (buffer->supplied) {
printk(FORE200E "bsq_audit(%d): queue %d.%d, buffer %ld supplied but in free list!\n",
where, scheme, magn, buffer->index);
}
if (buffer->magn != magn) {
printk(FORE200E "bsq_audit(%d): queue %d.%d, buffer %ld, unexpected magn = %d\n",
where, scheme, magn, buffer->index, buffer->magn);
}
if (buffer->scheme != scheme) {
printk(FORE200E "bsq_audit(%d): queue %d.%d, buffer %ld, unexpected scheme = %d\n",
where, scheme, magn, buffer->index, buffer->scheme);
}
if ((buffer->index < 0) || (buffer->index >= fore200e_rx_buf_nbr[ scheme ][ magn ])) {
printk(FORE200E "bsq_audit(%d): queue %d.%d, out of range buffer index = %ld !\n",
where, scheme, magn, buffer->index);
}
count++;
buffer = buffer->next;
}
if (count != bsq->freebuf_count) {
printk(FORE200E "bsq_audit(%d): queue %d.%d, %d bufs in free list, but freebuf_count = %d\n",
where, scheme, magn, count, bsq->freebuf_count);
}
return 0;
}
#endif
static void
fore200e_supply(struct fore200e* fore200e)
{
int scheme, magn, i;
struct host_bsq* bsq;
struct host_bsq_entry* entry;
struct buffer* buffer;
for (scheme = 0; scheme < BUFFER_SCHEME_NBR; scheme++) {
for (magn = 0; magn < BUFFER_MAGN_NBR; magn++) {
bsq = &fore200e->host_bsq[ scheme ][ magn ];
#ifdef FORE200E_BSQ_DEBUG
bsq_audit(1, bsq, scheme, magn);
#endif
while (bsq->freebuf_count >= RBD_BLK_SIZE) {
DPRINTK(2, "supplying %d rx buffers to queue %d / %d, freebuf_count = %d\n",
RBD_BLK_SIZE, scheme, magn, bsq->freebuf_count);
entry = &bsq->host_entry[ bsq->head ];
for (i = 0; i < RBD_BLK_SIZE; i++) {
/* take the first buffer in the free buffer list */
buffer = bsq->freebuf;
if (!buffer) {
printk(FORE200E "no more free bufs in queue %d.%d, but freebuf_count = %d\n",
scheme, magn, bsq->freebuf_count);
return;
}
bsq->freebuf = buffer->next;
#ifdef FORE200E_BSQ_DEBUG
if (buffer->supplied)
printk(FORE200E "queue %d.%d, buffer %lu already supplied\n",
scheme, magn, buffer->index);
buffer->supplied = 1;
#endif
entry->rbd_block->rbd[ i ].buffer_haddr = buffer->data.dma_addr;
entry->rbd_block->rbd[ i ].handle = FORE200E_BUF2HDL(buffer);
}
FORE200E_NEXT_ENTRY(bsq->head, QUEUE_SIZE_BS);
/* decrease accordingly the number of free rx buffers */
bsq->freebuf_count -= RBD_BLK_SIZE;
*entry->status = STATUS_PENDING;
fore200e->bus->write(entry->rbd_block_dma, &entry->cp_entry->rbd_block_haddr);
}
}
}
}
static int
fore200e_push_rpd(struct fore200e* fore200e, struct atm_vcc* vcc, struct rpd* rpd)
{
struct sk_buff* skb;
struct buffer* buffer;
struct fore200e_vcc* fore200e_vcc;
int i, pdu_len = 0;
#ifdef FORE200E_52BYTE_AAL0_SDU
u32 cell_header = 0;
#endif
ASSERT(vcc);
fore200e_vcc = FORE200E_VCC(vcc);
ASSERT(fore200e_vcc);
#ifdef FORE200E_52BYTE_AAL0_SDU
if ((vcc->qos.aal == ATM_AAL0) && (vcc->qos.rxtp.max_sdu == ATM_AAL0_SDU)) {
cell_header = (rpd->atm_header.gfc << ATM_HDR_GFC_SHIFT) |
(rpd->atm_header.vpi << ATM_HDR_VPI_SHIFT) |
(rpd->atm_header.vci << ATM_HDR_VCI_SHIFT) |
(rpd->atm_header.plt << ATM_HDR_PTI_SHIFT) |
rpd->atm_header.clp;
pdu_len = 4;
}
#endif
/* compute total PDU length */
for (i = 0; i < rpd->nseg; i++)
pdu_len += rpd->rsd[ i ].length;
skb = alloc_skb(pdu_len, GFP_ATOMIC);
if (skb == NULL) {
DPRINTK(2, "unable to alloc new skb, rx PDU length = %d\n", pdu_len);
atomic_inc(&vcc->stats->rx_drop);
return -ENOMEM;
}
__net_timestamp(skb);