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-rw-r--r--drivers/atm/ambassador.c2400
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diff --git a/drivers/atm/ambassador.c b/drivers/atm/ambassador.c
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index c039b8a4fefe..000000000000
--- a/drivers/atm/ambassador.c
+++ /dev/null
@@ -1,2400 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-or-later
-/*
- Madge Ambassador ATM Adapter driver.
- Copyright (C) 1995-1999 Madge Networks Ltd.
-
-*/
-
-/* * dedicated to the memory of Graham Gordon 1971-1998 * */
-
-#include <linux/module.h>
-#include <linux/types.h>
-#include <linux/pci.h>
-#include <linux/kernel.h>
-#include <linux/init.h>
-#include <linux/ioport.h>
-#include <linux/atmdev.h>
-#include <linux/delay.h>
-#include <linux/interrupt.h>
-#include <linux/poison.h>
-#include <linux/bitrev.h>
-#include <linux/mutex.h>
-#include <linux/firmware.h>
-#include <linux/ihex.h>
-#include <linux/slab.h>
-
-#include <linux/atomic.h>
-#include <asm/io.h>
-#include <asm/byteorder.h>
-
-#include "ambassador.h"
-
-#define maintainer_string "Giuliano Procida at Madge Networks <gprocida@madge.com>"
-#define description_string "Madge ATM Ambassador driver"
-#define version_string "1.2.4"
-
-static inline void __init show_version (void) {
- printk ("%s version %s\n", description_string, version_string);
-}
-
-/*
-
- Theory of Operation
-
- I Hardware, detection, initialisation and shutdown.
-
- 1. Supported Hardware
-
- This driver is for the PCI ATMizer-based Ambassador card (except
- very early versions). It is not suitable for the similar EISA "TR7"
- card. Commercially, both cards are known as Collage Server ATM
- adapters.
-
- The loader supports image transfer to the card, image start and few
- other miscellaneous commands.
-
- Only AAL5 is supported with vpi = 0 and vci in the range 0 to 1023.
-
- The cards are big-endian.
-
- 2. Detection
-
- Standard PCI stuff, the early cards are detected and rejected.
-
- 3. Initialisation
-
- The cards are reset and the self-test results are checked. The
- microcode image is then transferred and started. This waits for a
- pointer to a descriptor containing details of the host-based queues
- and buffers and various parameters etc. Once they are processed
- normal operations may begin. The BIA is read using a microcode
- command.
-
- 4. Shutdown
-
- This may be accomplished either by a card reset or via the microcode
- shutdown command. Further investigation required.
-
- 5. Persistent state
-
- The card reset does not affect PCI configuration (good) or the
- contents of several other "shared run-time registers" (bad) which
- include doorbell and interrupt control as well as EEPROM and PCI
- control. The driver must be careful when modifying these registers
- not to touch bits it does not use and to undo any changes at exit.
-
- II Driver software
-
- 0. Generalities
-
- The adapter is quite intelligent (fast) and has a simple interface
- (few features). VPI is always zero, 1024 VCIs are supported. There
- is limited cell rate support. UBR channels can be capped and ABR
- (explicit rate, but not EFCI) is supported. There is no CBR or VBR
- support.
-
- 1. Driver <-> Adapter Communication
-
- Apart from the basic loader commands, the driver communicates
- through three entities: the command queue (CQ), the transmit queue
- pair (TXQ) and the receive queue pairs (RXQ). These three entities
- are set up by the host and passed to the microcode just after it has
- been started.
-
- All queues are host-based circular queues. They are contiguous and
- (due to hardware limitations) have some restrictions as to their
- locations in (bus) memory. They are of the "full means the same as
- empty so don't do that" variety since the adapter uses pointers
- internally.
-
- The queue pairs work as follows: one queue is for supply to the
- adapter, items in it are pending and are owned by the adapter; the
- other is the queue for return from the adapter, items in it have
- been dealt with by the adapter. The host adds items to the supply
- (TX descriptors and free RX buffer descriptors) and removes items
- from the return (TX and RX completions). The adapter deals with out
- of order completions.
-
- Interrupts (card to host) and the doorbell (host to card) are used
- for signalling.
-
- 1. CQ
-
- This is to communicate "open VC", "close VC", "get stats" etc. to
- the adapter. At most one command is retired every millisecond by the
- card. There is no out of order completion or notification. The
- driver needs to check the return code of the command, waiting as
- appropriate.
-
- 2. TXQ
-
- TX supply items are of variable length (scatter gather support) and
- so the queue items are (more or less) pointers to the real thing.
- Each TX supply item contains a unique, host-supplied handle (the skb
- bus address seems most sensible as this works for Alphas as well,
- there is no need to do any endian conversions on the handles).
-
- TX return items consist of just the handles above.
-
- 3. RXQ (up to 4 of these with different lengths and buffer sizes)
-
- RX supply items consist of a unique, host-supplied handle (the skb
- bus address again) and a pointer to the buffer data area.
-
- RX return items consist of the handle above, the VC, length and a
- status word. This just screams "oh so easy" doesn't it?
-
- Note on RX pool sizes:
-
- Each pool should have enough buffers to handle a back-to-back stream
- of minimum sized frames on a single VC. For example:
-
- frame spacing = 3us (about right)
-
- delay = IRQ lat + RX handling + RX buffer replenish = 20 (us) (a guess)
-
- min number of buffers for one VC = 1 + delay/spacing (buffers)
-
- delay/spacing = latency = (20+2)/3 = 7 (buffers) (rounding up)
-
- The 20us delay assumes that there is no need to sleep; if we need to
- sleep to get buffers we are going to drop frames anyway.
-
- In fact, each pool should have enough buffers to support the
- simultaneous reassembly of a separate frame on each VC and cope with
- the case in which frames complete in round robin cell fashion on
- each VC.
-
- Only one frame can complete at each cell arrival, so if "n" VCs are
- open, the worst case is to have them all complete frames together
- followed by all starting new frames together.
-
- desired number of buffers = n + delay/spacing
-
- These are the extreme requirements, however, they are "n+k" for some
- "k" so we have only the constant to choose. This is the argument
- rx_lats which current defaults to 7.
-
- Actually, "n ? n+k : 0" is better and this is what is implemented,
- subject to the limit given by the pool size.
-
- 4. Driver locking
-
- Simple spinlocks are used around the TX and RX queue mechanisms.
- Anyone with a faster, working method is welcome to implement it.
-
- The adapter command queue is protected with a spinlock. We always
- wait for commands to complete.
-
- A more complex form of locking is used around parts of the VC open
- and close functions. There are three reasons for a lock: 1. we need
- to do atomic rate reservation and release (not used yet), 2. Opening
- sometimes involves two adapter commands which must not be separated
- by another command on the same VC, 3. the changes to RX pool size
- must be atomic. The lock needs to work over context switches, so we
- use a semaphore.
-
- III Hardware Features and Microcode Bugs
-
- 1. Byte Ordering
-
- *%^"$&%^$*&^"$(%^$#&^%$(&#%$*(&^#%!"!"!*!
-
- 2. Memory access
-
- All structures that are not accessed using DMA must be 4-byte
- aligned (not a problem) and must not cross 4MB boundaries.
-
- There is a DMA memory hole at E0000000-E00000FF (groan).
-
- TX fragments (DMA read) must not cross 4MB boundaries (would be 16MB
- but for a hardware bug).
-
- RX buffers (DMA write) must not cross 16MB boundaries and must
- include spare trailing bytes up to the next 4-byte boundary; they
- will be written with rubbish.
-
- The PLX likes to prefetch; if reading up to 4 u32 past the end of
- each TX fragment is not a problem, then TX can be made to go a
- little faster by passing a flag at init that disables a prefetch
- workaround. We do not pass this flag. (new microcode only)
-
- Now we:
- . Note that alloc_skb rounds up size to a 16byte boundary.
- . Ensure all areas do not traverse 4MB boundaries.
- . Ensure all areas do not start at a E00000xx bus address.
- (I cannot be certain, but this may always hold with Linux)
- . Make all failures cause a loud message.
- . Discard non-conforming SKBs (causes TX failure or RX fill delay).
- . Discard non-conforming TX fragment descriptors (the TX fails).
- In the future we could:
- . Allow RX areas that traverse 4MB (but not 16MB) boundaries.
- . Segment TX areas into some/more fragments, when necessary.
- . Relax checks for non-DMA items (ignore hole).
- . Give scatter-gather (iovec) requirements using ???. (?)
-
- 3. VC close is broken (only for new microcode)
-
- The VC close adapter microcode command fails to do anything if any
- frames have been received on the VC but none have been transmitted.
- Frames continue to be reassembled and passed (with IRQ) to the
- driver.
-
- IV To Do List
-
- . Fix bugs!
-
- . Timer code may be broken.
-
- . Deal with buggy VC close (somehow) in microcode 12.
-
- . Handle interrupted and/or non-blocking writes - is this a job for
- the protocol layer?
-
- . Add code to break up TX fragments when they span 4MB boundaries.
-
- . Add SUNI phy layer (need to know where SUNI lives on card).
-
- . Implement a tx_alloc fn to (a) satisfy TX alignment etc. and (b)
- leave extra headroom space for Ambassador TX descriptors.
-
- . Understand these elements of struct atm_vcc: recvq (proto?),
- sleep, callback, listenq, backlog_quota, reply and user_back.
-
- . Adjust TX/RX skb allocation to favour IP with LANE/CLIP (configurable).
-
- . Impose a TX-pending limit (2?) on each VC, help avoid TX q overflow.
-
- . Decide whether RX buffer recycling is or can be made completely safe;
- turn it back on. It looks like Werner is going to axe this.
-
- . Implement QoS changes on open VCs (involves extracting parts of VC open
- and close into separate functions and using them to make changes).
-
- . Hack on command queue so that someone can issue multiple commands and wait
- on the last one (OR only "no-op" or "wait" commands are waited for).
-
- . Eliminate need for while-schedule around do_command.
-
-*/
-
-static void do_housekeeping (struct timer_list *t);
-/********** globals **********/
-
-static unsigned short debug = 0;
-static unsigned int cmds = 8;
-static unsigned int txs = 32;
-static unsigned int rxs[NUM_RX_POOLS] = { 64, 64, 64, 64 };
-static unsigned int rxs_bs[NUM_RX_POOLS] = { 4080, 12240, 36720, 65535 };
-static unsigned int rx_lats = 7;
-static unsigned char pci_lat = 0;
-
-static const unsigned long onegigmask = -1 << 30;
-
-/********** access to adapter **********/
-
-static inline void wr_plain (const amb_dev * dev, size_t addr, u32 data) {
- PRINTD (DBG_FLOW|DBG_REGS, "wr: %08zx <- %08x", addr, data);
-#ifdef AMB_MMIO
- dev->membase[addr / sizeof(u32)] = data;
-#else
- outl (data, dev->iobase + addr);
-#endif
-}
-
-static inline u32 rd_plain (const amb_dev * dev, size_t addr) {
-#ifdef AMB_MMIO
- u32 data = dev->membase[addr / sizeof(u32)];
-#else
- u32 data = inl (dev->iobase + addr);
-#endif
- PRINTD (DBG_FLOW|DBG_REGS, "rd: %08zx -> %08x", addr, data);
- return data;
-}
-
-static inline void wr_mem (const amb_dev * dev, size_t addr, u32 data) {
- __be32 be = cpu_to_be32 (data);
- PRINTD (DBG_FLOW|DBG_REGS, "wr: %08zx <- %08x b[%08x]", addr, data, be);
-#ifdef AMB_MMIO
- dev->membase[addr / sizeof(u32)] = be;
-#else
- outl (be, dev->iobase + addr);
-#endif
-}
-
-static inline u32 rd_mem (const amb_dev * dev, size_t addr) {
-#ifdef AMB_MMIO
- __be32 be = dev->membase[addr / sizeof(u32)];
-#else
- __be32 be = inl (dev->iobase + addr);
-#endif
- u32 data = be32_to_cpu (be);
- PRINTD (DBG_FLOW|DBG_REGS, "rd: %08zx -> %08x b[%08x]", addr, data, be);
- return data;
-}
-
-/********** dump routines **********/
-
-static inline void dump_registers (const amb_dev * dev) {
-#ifdef DEBUG_AMBASSADOR
- if (debug & DBG_REGS) {
- size_t i;
- PRINTD (DBG_REGS, "reading PLX control: ");
- for (i = 0x00; i < 0x30; i += sizeof(u32))
- rd_mem (dev, i);
- PRINTD (DBG_REGS, "reading mailboxes: ");
- for (i = 0x40; i < 0x60; i += sizeof(u32))
- rd_mem (dev, i);
- PRINTD (DBG_REGS, "reading doorb irqev irqen reset:");
- for (i = 0x60; i < 0x70; i += sizeof(u32))
- rd_mem (dev, i);
- }
-#else
- (void) dev;
-#endif
- return;
-}
-
-static inline void dump_loader_block (volatile loader_block * lb) {
-#ifdef DEBUG_AMBASSADOR
- unsigned int i;
- PRINTDB (DBG_LOAD, "lb @ %p; res: %d, cmd: %d, pay:",
- lb, be32_to_cpu (lb->result), be32_to_cpu (lb->command));
- for (i = 0; i < MAX_COMMAND_DATA; ++i)
- PRINTDM (DBG_LOAD, " %08x", be32_to_cpu (lb->payload.data[i]));
- PRINTDE (DBG_LOAD, ", vld: %08x", be32_to_cpu (lb->valid));
-#else
- (void) lb;
-#endif
- return;
-}
-
-static inline void dump_command (command * cmd) {
-#ifdef DEBUG_AMBASSADOR
- unsigned int i;
- PRINTDB (DBG_CMD, "cmd @ %p, req: %08x, pars:",
- cmd, /*be32_to_cpu*/ (cmd->request));
- for (i = 0; i < 3; ++i)
- PRINTDM (DBG_CMD, " %08x", /*be32_to_cpu*/ (cmd->args.par[i]));
- PRINTDE (DBG_CMD, "");
-#else
- (void) cmd;
-#endif
- return;
-}
-
-static inline void dump_skb (char * prefix, unsigned int vc, struct sk_buff * skb) {
-#ifdef DEBUG_AMBASSADOR
- unsigned int i;
- unsigned char * data = skb->data;
- PRINTDB (DBG_DATA, "%s(%u) ", prefix, vc);
- for (i=0; i<skb->len && i < 256;i++)
- PRINTDM (DBG_DATA, "%02x ", data[i]);
- PRINTDE (DBG_DATA,"");
-#else
- (void) prefix;
- (void) vc;
- (void) skb;
-#endif
- return;
-}
-
-/********** check memory areas for use by Ambassador **********/
-
-/* see limitations under Hardware Features */
-
-static int check_area (void * start, size_t length) {
- // assumes length > 0
- const u32 fourmegmask = -1 << 22;
- const u32 twofivesixmask = -1 << 8;
- const u32 starthole = 0xE0000000;
- u32 startaddress = virt_to_bus (start);
- u32 lastaddress = startaddress+length-1;
- if ((startaddress ^ lastaddress) & fourmegmask ||
- (startaddress & twofivesixmask) == starthole) {
- PRINTK (KERN_ERR, "check_area failure: [%x,%x] - mail maintainer!",
- startaddress, lastaddress);
- return -1;
- } else {
- return 0;
- }
-}
-
-/********** free an skb (as per ATM device driver documentation) **********/
-
-static void amb_kfree_skb (struct sk_buff * skb) {
- if (ATM_SKB(skb)->vcc->pop) {
- ATM_SKB(skb)->vcc->pop (ATM_SKB(skb)->vcc, skb);
- } else {
- dev_kfree_skb_any (skb);
- }
-}
-
-/********** TX completion **********/
-
-static void tx_complete (amb_dev * dev, tx_out * tx) {
- tx_simple * tx_descr = bus_to_virt (tx->handle);
- struct sk_buff * skb = tx_descr->skb;
-
- PRINTD (DBG_FLOW|DBG_TX, "tx_complete %p %p", dev, tx);
-
- // VC layer stats
- atomic_inc(&ATM_SKB(skb)->vcc->stats->tx);
-
- // free the descriptor
- kfree (tx_descr);
-
- // free the skb
- amb_kfree_skb (skb);
-
- dev->stats.tx_ok++;
- return;
-}
-
-/********** RX completion **********/
-
-static void rx_complete (amb_dev * dev, rx_out * rx) {
- struct sk_buff * skb = bus_to_virt (rx->handle);
- u16 vc = be16_to_cpu (rx->vc);
- // unused: u16 lec_id = be16_to_cpu (rx->lec_id);
- u16 status = be16_to_cpu (rx->status);
- u16 rx_len = be16_to_cpu (rx->length);
-
- PRINTD (DBG_FLOW|DBG_RX, "rx_complete %p %p (len=%hu)", dev, rx, rx_len);
-
- // XXX move this in and add to VC stats ???
- if (!status) {
- struct atm_vcc * atm_vcc = dev->rxer[vc];
- dev->stats.rx.ok++;
-
- if (atm_vcc) {
-
- if (rx_len <= atm_vcc->qos.rxtp.max_sdu) {
-
- if (atm_charge (atm_vcc, skb->truesize)) {
-
- // prepare socket buffer
- ATM_SKB(skb)->vcc = atm_vcc;
- skb_put (skb, rx_len);
-
- dump_skb ("<<<", vc, skb);
-
- // VC layer stats
- atomic_inc(&atm_vcc->stats->rx);
- __net_timestamp(skb);
- // end of our responsibility
- atm_vcc->push (atm_vcc, skb);
- return;
-
- } else {
- // someone fix this (message), please!
- PRINTD (DBG_INFO|DBG_RX, "dropped thanks to atm_charge (vc %hu, truesize %u)", vc, skb->truesize);
- // drop stats incremented in atm_charge
- }
-
- } else {
- PRINTK (KERN_INFO, "dropped over-size frame");
- // should we count this?
- atomic_inc(&atm_vcc->stats->rx_drop);
- }
-
- } else {
- PRINTD (DBG_WARN|DBG_RX, "got frame but RX closed for channel %hu", vc);
- // this is an adapter bug, only in new version of microcode
- }
-
- } else {
- dev->stats.rx.error++;
- if (status & CRC_ERR)
- dev->stats.rx.badcrc++;
- if (status & LEN_ERR)
- dev->stats.rx.toolong++;
- if (status & ABORT_ERR)
- dev->stats.rx.aborted++;
- if (status & UNUSED_ERR)
- dev->stats.rx.unused++;
- }
-
- dev_kfree_skb_any (skb);
- return;
-}
-
-/*
-
- Note on queue handling.
-
- Here "give" and "take" refer to queue entries and a queue (pair)
- rather than frames to or from the host or adapter. Empty frame
- buffers are given to the RX queue pair and returned unused or
- containing RX frames. TX frames (well, pointers to TX fragment
- lists) are given to the TX queue pair, completions are returned.
-
-*/
-
-/********** command queue **********/
-
-// I really don't like this, but it's the best I can do at the moment
-
-// also, the callers are responsible for byte order as the microcode
-// sometimes does 16-bit accesses (yuk yuk yuk)
-
-static int command_do (amb_dev * dev, command * cmd) {
- amb_cq * cq = &dev->cq;
- volatile amb_cq_ptrs * ptrs = &cq->ptrs;
- command * my_slot;
-
- PRINTD (DBG_FLOW|DBG_CMD, "command_do %p", dev);
-
- if (test_bit (dead, &dev->flags))
- return 0;
-
- spin_lock (&cq->lock);
-
- // if not full...
- if (cq->pending < cq->maximum) {
- // remember my slot for later
- my_slot = ptrs->in;
- PRINTD (DBG_CMD, "command in slot %p", my_slot);
-
- dump_command (cmd);
-
- // copy command in
- *ptrs->in = *cmd;
- cq->pending++;
- ptrs->in = NEXTQ (ptrs->in, ptrs->start, ptrs->limit);
-
- // mail the command
- wr_mem (dev, offsetof(amb_mem, mb.adapter.cmd_address), virt_to_bus (ptrs->in));
-
- if (cq->pending > cq->high)
- cq->high = cq->pending;
- spin_unlock (&cq->lock);
-
- // these comments were in a while-loop before, msleep removes the loop
- // go to sleep
- // PRINTD (DBG_CMD, "wait: sleeping %lu for command", timeout);
- msleep(cq->pending);
-
- // wait for my slot to be reached (all waiters are here or above, until...)
- while (ptrs->out != my_slot) {
- PRINTD (DBG_CMD, "wait: command slot (now at %p)", ptrs->out);
- set_current_state(TASK_UNINTERRUPTIBLE);
- schedule();
- }
-
- // wait on my slot (... one gets to its slot, and... )
- while (ptrs->out->request != cpu_to_be32 (SRB_COMPLETE)) {
- PRINTD (DBG_CMD, "wait: command slot completion");
- set_current_state(TASK_UNINTERRUPTIBLE);
- schedule();
- }
-
- PRINTD (DBG_CMD, "command complete");
- // update queue (... moves the queue along to the next slot)
- spin_lock (&cq->lock);
- cq->pending--;
- // copy command out
- *cmd = *ptrs->out;
- ptrs->out = NEXTQ (ptrs->out, ptrs->start, ptrs->limit);
- spin_unlock (&cq->lock);
-
- return 0;
- } else {
- cq->filled++;
- spin_unlock (&cq->lock);
- return -EAGAIN;
- }
-
-}
-
-/********** TX queue pair **********/
-
-static int tx_give (amb_dev * dev, tx_in * tx) {
- amb_txq * txq = &dev->txq;
- unsigned long flags;
-
- PRINTD (DBG_FLOW|DBG_TX, "tx_give %p", dev);
-
- if (test_bit (dead, &dev->flags))
- return 0;
-
- spin_lock_irqsave (&txq->lock, flags);
-
- if (txq->pending < txq->maximum) {
- PRINTD (DBG_TX, "TX in slot %p", txq->in.ptr);
-
- *txq->in.ptr = *tx;
- txq->pending++;
- txq->in.ptr = NEXTQ (txq->in.ptr, txq->in.start, txq->in.limit);
- // hand over the TX and ring the bell
- wr_mem (dev, offsetof(amb_mem, mb.adapter.tx_address), virt_to_bus (txq->in.ptr));
- wr_mem (dev, offsetof(amb_mem, doorbell), TX_FRAME);
-
- if (txq->pending > txq->high)
- txq->high = txq->pending;
- spin_unlock_irqrestore (&txq->lock, flags);
- return 0;
- } else {
- txq->filled++;
- spin_unlock_irqrestore (&txq->lock, flags);
- return -EAGAIN;
- }
-}
-
-static int tx_take (amb_dev * dev) {
- amb_txq * txq = &dev->txq;
- unsigned long flags;
-
- PRINTD (DBG_FLOW|DBG_TX, "tx_take %p", dev);
-
- spin_lock_irqsave (&txq->lock, flags);
-
- if (txq->pending && txq->out.ptr->handle) {
- // deal with TX completion
- tx_complete (dev, txq->out.ptr);
- // mark unused again
- txq->out.ptr->handle = 0;
- // remove item
- txq->pending--;
- txq->out.ptr = NEXTQ (txq->out.ptr, txq->out.start, txq->out.limit);
-
- spin_unlock_irqrestore (&txq->lock, flags);
- return 0;
- } else {
-
- spin_unlock_irqrestore (&txq->lock, flags);
- return -1;
- }
-}
-
-/********** RX queue pairs **********/
-
-static int rx_give (amb_dev * dev, rx_in * rx, unsigned char pool) {
- amb_rxq * rxq = &dev->rxq[pool];
- unsigned long flags;
-
- PRINTD (DBG_FLOW|DBG_RX, "rx_give %p[%hu]", dev, pool);
-
- spin_lock_irqsave (&rxq->lock, flags);
-
- if (rxq->pending < rxq->maximum) {
- PRINTD (DBG_RX, "RX in slot %p", rxq->in.ptr);
-
- *rxq->in.ptr = *rx;
- rxq->pending++;
- rxq->in.ptr = NEXTQ (rxq->in.ptr, rxq->in.start, rxq->in.limit);
- // hand over the RX buffer
- wr_mem (dev, offsetof(amb_mem, mb.adapter.rx_address[pool]), virt_to_bus (rxq->in.ptr));
-
- spin_unlock_irqrestore (&rxq->lock, flags);
- return 0;
- } else {
- spin_unlock_irqrestore (&rxq->lock, flags);
- return -1;
- }
-}
-
-static int rx_take (amb_dev * dev, unsigned char pool) {
- amb_rxq * rxq = &dev->rxq[pool];
- unsigned long flags;
-
- PRINTD (DBG_FLOW|DBG_RX, "rx_take %p[%hu]", dev, pool);
-
- spin_lock_irqsave (&rxq->lock, flags);
-
- if (rxq->pending && (rxq->out.ptr->status || rxq->out.ptr->length)) {
- // deal with RX completion
- rx_complete (dev, rxq->out.ptr);
- // mark unused again
- rxq->out.ptr->status = 0;
- rxq->out.ptr->length = 0;
- // remove item
- rxq->pending--;
- rxq->out.ptr = NEXTQ (rxq->out.ptr, rxq->out.start, rxq->out.limit);
-
- if (rxq->pending < rxq->low)
- rxq->low = rxq->pending;
- spin_unlock_irqrestore (&rxq->lock, flags);
- return 0;
- } else {
- if (!rxq->pending && rxq->buffers_wanted)
- rxq->emptied++;
- spin_unlock_irqrestore (&rxq->lock, flags);
- return -1;
- }
-}
-
-/********** RX Pool handling **********/
-
-/* pre: buffers_wanted = 0, post: pending = 0 */
-static void drain_rx_pool (amb_dev * dev, unsigned char pool) {
- amb_rxq * rxq = &dev->rxq[pool];
-
- PRINTD (DBG_FLOW|DBG_POOL, "drain_rx_pool %p %hu", dev, pool);
-
- if (test_bit (dead, &dev->flags))
- return;
-
- /* we are not quite like the fill pool routines as we cannot just
- remove one buffer, we have to remove all of them, but we might as
- well pretend... */
- if (rxq->pending > rxq->buffers_wanted) {
- command cmd;
- cmd.request = cpu_to_be32 (SRB_FLUSH_BUFFER_Q);
- cmd.args.flush.flags = cpu_to_be32 (pool << SRB_POOL_SHIFT);
- while (command_do (dev, &cmd))
- schedule();
- /* the pool may also be emptied via the interrupt handler */
- while (rxq->pending > rxq->buffers_wanted)
- if (rx_take (dev, pool))
- schedule();
- }
-
- return;
-}
-
-static void drain_rx_pools (amb_dev * dev) {
- unsigned char pool;
-
- PRINTD (DBG_FLOW|DBG_POOL, "drain_rx_pools %p", dev);
-
- for (pool = 0; pool < NUM_RX_POOLS; ++pool)
- drain_rx_pool (dev, pool);
-}
-
-static void fill_rx_pool (amb_dev * dev, unsigned char pool,
- gfp_t priority)
-{
- rx_in rx;
- amb_rxq * rxq;
-
- PRINTD (DBG_FLOW|DBG_POOL, "fill_rx_pool %p %hu %x", dev, pool, priority);
-
- if (test_bit (dead, &dev->flags))
- return;
-
- rxq = &dev->rxq[pool];
- while (rxq->pending < rxq->maximum && rxq->pending < rxq->buffers_wanted) {
-
- struct sk_buff * skb = alloc_skb (rxq->buffer_size, priority);
- if (!skb) {
- PRINTD (DBG_SKB|DBG_POOL, "failed to allocate skb for RX pool %hu", pool);
- return;
- }
- if (check_area (skb->data, skb->truesize)) {
- dev_kfree_skb_any (skb);
- return;
- }
- // cast needed as there is no %? for pointer differences
- PRINTD (DBG_SKB, "allocated skb at %p, head %p, area %li",
- skb, skb->head, (long) skb_end_offset(skb));
- rx.handle = virt_to_bus (skb);
- rx.host_address = cpu_to_be32 (virt_to_bus (skb->data));
- if (rx_give (dev, &rx, pool))
- dev_kfree_skb_any (skb);
-
- }
-
- return;
-}
-
-// top up all RX pools
-static void fill_rx_pools (amb_dev * dev) {
- unsigned char pool;
-
- PRINTD (DBG_FLOW|DBG_POOL, "fill_rx_pools %p", dev);
-
- for (pool = 0; pool < NUM_RX_POOLS; ++pool)
- fill_rx_pool (dev, pool, GFP_ATOMIC);
-
- return;
-}
-
-/********** enable host interrupts **********/
-
-static void interrupts_on (amb_dev * dev) {
- wr_plain (dev, offsetof(amb_mem, interrupt_control),
- rd_plain (dev, offsetof(amb_mem, interrupt_control))
- | AMB_INTERRUPT_BITS);
-}
-
-/********** disable host interrupts **********/
-
-static void interrupts_off (amb_dev * dev) {
- wr_plain (dev, offsetof(amb_mem, interrupt_control),
- rd_plain (dev, offsetof(amb_mem, interrupt_control))
- &~ AMB_INTERRUPT_BITS);
-}
-
-/********** interrupt handling **********/
-
-static irqreturn_t interrupt_handler(int irq, void *dev_id) {
- amb_dev * dev = dev_id;
-
- PRINTD (DBG_IRQ|DBG_FLOW, "interrupt_handler: %p", dev_id);
-
- {
- u32 interrupt = rd_plain (dev, offsetof(amb_mem, interrupt));
-
- // for us or someone else sharing the same interrupt
- if (!interrupt) {
- PRINTD (DBG_IRQ, "irq not for me: %d", irq);
- return IRQ_NONE;
- }
-
- // definitely for us
- PRINTD (DBG_IRQ, "FYI: interrupt was %08x", interrupt);
- wr_plain (dev, offsetof(amb_mem, interrupt), -1);
- }
-
- {
- unsigned int irq_work = 0;
- unsigned char pool;
- for (pool = 0; pool < NUM_RX_POOLS; ++pool)
- while (!rx_take (dev, pool))
- ++irq_work;
- while (!tx_take (dev))
- ++irq_work;
-
- if (irq_work) {
- fill_rx_pools (dev);
-
- PRINTD (DBG_IRQ, "work done: %u", irq_work);
- } else {
- PRINTD (DBG_IRQ|DBG_WARN, "no work done");
- }
- }
-
- PRINTD (DBG_IRQ|DBG_FLOW, "interrupt_handler done: %p", dev_id);
- return IRQ_HANDLED;
-}
-
-/********** make rate (not quite as much fun as Horizon) **********/
-
-static int make_rate (unsigned int rate, rounding r,
- u16 * bits, unsigned int * actual) {
- unsigned char exp = -1; // hush gcc
- unsigned int man = -1; // hush gcc
-
- PRINTD (DBG_FLOW|DBG_QOS, "make_rate %u", rate);
-
- // rates in cells per second, ITU format (nasty 16-bit floating-point)
- // given 5-bit e and 9-bit m:
- // rate = EITHER (1+m/2^9)*2^e OR 0
- // bits = EITHER 1<<14 | e<<9 | m OR 0
- // (bit 15 is "reserved", bit 14 "non-zero")
- // smallest rate is 0 (special representation)
- // largest rate is (1+511/512)*2^31 = 4290772992 (< 2^32-1)
- // smallest non-zero rate is (1+0/512)*2^0 = 1 (> 0)
- // simple algorithm:
- // find position of top bit, this gives e
- // remove top bit and shift (rounding if feeling clever) by 9-e
-
- // ucode bug: please don't set bit 14! so 0 rate not representable
-
- if (rate > 0xffc00000U) {
- // larger than largest representable rate
-
- if (r == round_up) {
- return -EINVAL;
- } else {
- exp = 31;
- man = 511;
- }
-
- } else if (rate) {
- // representable rate
-
- exp = 31;
- man = rate;
-
- // invariant: rate = man*2^(exp-31)
- while (!(man & (1<<31))) {
- exp = exp - 1;
- man = man<<1;
- }
-
- // man has top bit set
- // rate = (2^31+(man-2^31))*2^(exp-31)
- // rate = (1+(man-2^31)/2^31)*2^exp
- man = man<<1;
- man &= 0xffffffffU; // a nop on 32-bit systems
- // rate = (1+man/2^32)*2^exp
-
- // exp is in the range 0 to 31, man is in the range 0 to 2^32-1
- // time to lose significance... we want m in the range 0 to 2^9-1
- // rounding presents a minor problem... we first decide which way
- // we are rounding (based on given rounding direction and possibly
- // the bits of the mantissa that are to be discarded).
-
- switch (r) {
- case round_down: {
- // just truncate
- man = man>>(32-9);
- break;
- }
- case round_up: {
- // check all bits that we are discarding
- if (man & (~0U>>9)) {
- man = (man>>(32-9)) + 1;
- if (man == (1<<9)) {
- // no need to check for round up outside of range
- man = 0;
- exp += 1;
- }
- } else {
- man = (man>>(32-9));
- }
- break;
- }
- case round_nearest: {
- // check msb that we are discarding
- if (man & (1<<(32-9-1))) {
- man = (man>>(32-9)) + 1;
- if (man == (1<<9)) {
- // no need to check for round up outside of range
- man = 0;
- exp += 1;
- }
- } else {
- man = (man>>(32-9));
- }
- break;
- }
- }
-
- } else {
- // zero rate - not representable
-
- if (r == round_down) {
- return -EINVAL;
- } else {
- exp = 0;
- man = 0;
- }
-
- }
-
- PRINTD (DBG_QOS, "rate: man=%u, exp=%hu", man, exp);
-
- if (bits)
- *bits = /* (1<<14) | */ (exp<<9) | man;
-
- if (actual)
- *actual = (exp >= 9)
- ? (1 << exp) + (man << (exp-9))
- : (1 << exp) + ((man + (1<<(9-exp-1))) >> (9-exp));
-
- return 0;
-}
-
-/********** Linux ATM Operations **********/
-
-// some are not yet implemented while others do not make sense for
-// this device
-
-/********** Open a VC **********/
-
-static int amb_open (struct atm_vcc * atm_vcc)
-{
- int error;
-
- struct atm_qos * qos;
- struct atm_trafprm * txtp;
- struct atm_trafprm * rxtp;
- u16 tx_rate_bits = -1; // hush gcc
- u16 tx_vc_bits = -1; // hush gcc
- u16 tx_frame_bits = -1; // hush gcc
-
- amb_dev * dev = AMB_DEV(atm_vcc->dev);
- amb_vcc * vcc;
- unsigned char pool = -1; // hush gcc
- short vpi = atm_vcc->vpi;
- int vci = atm_vcc->vci;
-
- PRINTD (DBG_FLOW|DBG_VCC, "amb_open %x %x", vpi, vci);
-
-#ifdef ATM_VPI_UNSPEC
- // UNSPEC is deprecated, remove this code eventually
- if (vpi == ATM_VPI_UNSPEC || vci == ATM_VCI_UNSPEC) {
- PRINTK (KERN_WARNING, "rejecting open with unspecified VPI/VCI (deprecated)");
- return -EINVAL;
- }
-#endif
-
- if (!(0 <= vpi && vpi < (1<<NUM_VPI_BITS) &&
- 0 <= vci && vci < (1<<NUM_VCI_BITS))) {
- PRINTD (DBG_WARN|DBG_VCC, "VPI/VCI out of range: %hd/%d", vpi, vci);
- return -EINVAL;
- }
-
- qos = &atm_vcc->qos;
-
- if (qos->aal != ATM_AAL5) {
- PRINTD (DBG_QOS, "AAL not supported");
- return -EINVAL;
- }
-
- // traffic parameters
-
- PRINTD (DBG_QOS, "TX:");
- txtp = &qos->txtp;
- if (txtp->traffic_class != ATM_NONE) {
- switch (txtp->traffic_class) {
- case ATM_UBR: {
- // we take "the PCR" as a rate-cap
- int pcr = atm_pcr_goal (txtp);
- if (!pcr) {
- // no rate cap
- tx_rate_bits = 0;
- tx_vc_bits = TX_UBR;
- tx_frame_bits = TX_FRAME_NOTCAP;
- } else {
- rounding r;
- if (pcr < 0) {
- r = round_down;
- pcr = -pcr;
- } else {
- r = round_up;
- }
- error = make_rate (pcr, r, &tx_rate_bits, NULL);
- if (error)
- return error;
- tx_vc_bits = TX_UBR_CAPPED;
- tx_frame_bits = TX_FRAME_CAPPED;
- }
- break;
- }
-#if 0
- case ATM_ABR: {
- pcr = atm_pcr_goal (txtp);
- PRINTD (DBG_QOS, "pcr goal = %d", pcr);
- break;
- }
-#endif
- default: {
- // PRINTD (DBG_QOS, "request for non-UBR/ABR denied");
- PRINTD (DBG_QOS, "request for non-UBR denied");
- return -EINVAL;
- }
- }
- PRINTD (DBG_QOS, "tx_rate_bits=%hx, tx_vc_bits=%hx",
- tx_rate_bits, tx_vc_bits);
- }
-
- PRINTD (DBG_QOS, "RX:");
- rxtp = &qos->rxtp;
- if (rxtp->traffic_class == ATM_NONE) {
- // do nothing
- } else {
- // choose an RX pool (arranged in increasing size)
- for (pool = 0; pool < NUM_RX_POOLS; ++pool)
- if ((unsigned int) rxtp->max_sdu <= dev->rxq[pool].buffer_size) {
- PRINTD (DBG_VCC|DBG_QOS|DBG_POOL, "chose pool %hu (max_sdu %u <= %u)",
- pool, rxtp->max_sdu, dev->rxq[pool].buffer_size);
- break;
- }
- if (pool == NUM_RX_POOLS) {
- PRINTD (DBG_WARN|DBG_VCC|DBG_QOS|DBG_POOL,
- "no pool suitable for VC (RX max_sdu %d is too large)",
- rxtp->max_sdu);
- return -EINVAL;
- }
-
- switch (rxtp->traffic_class) {
- case ATM_UBR: {
- break;
- }
-#if 0
- case ATM_ABR: {
- pcr = atm_pcr_goal (rxtp);
- PRINTD (DBG_QOS, "pcr goal = %d", pcr);
- break;
- }
-#endif
- default: {
- // PRINTD (DBG_QOS, "request for non-UBR/ABR denied");
- PRINTD (DBG_QOS, "request for non-UBR denied");
- return -EINVAL;
- }
- }
- }
-
- // get space for our vcc stuff
- vcc = kmalloc (sizeof(amb_vcc), GFP_KERNEL);
- if (!vcc) {
- PRINTK (KERN_ERR, "out of memory!");
- return -ENOMEM;
- }
- atm_vcc->dev_data = (void *) vcc;
-
- // no failures beyond this point
-
- // we are not really "immediately before allocating the connection
- // identifier in hardware", but it will just have to do!
- set_bit(ATM_VF_ADDR,&atm_vcc->flags);
-
- if (txtp->traffic_class != ATM_NONE) {
- command cmd;
-
- vcc->tx_frame_bits = tx_frame_bits;
-
- mutex_lock(&dev->vcc_sf);
- if (dev->rxer[vci]) {
- // RXer on the channel already, just modify rate...
- cmd.request = cpu_to_be32 (SRB_MODIFY_VC_RATE);
- cmd.args.modify_rate.vc = cpu_to_be32 (vci); // vpi 0
- cmd.args.modify_rate.rate = cpu_to_be32 (tx_rate_bits << SRB_RATE_SHIFT);
- while (command_do (dev, &cmd))
- schedule();
- // ... and TX flags, preserving the RX pool
- cmd.request = cpu_to_be32 (SRB_MODIFY_VC_FLAGS);
- cmd.args.modify_flags.vc = cpu_to_be32 (vci); // vpi 0
- cmd.args.modify_flags.flags = cpu_to_be32
- ( (AMB_VCC(dev->rxer[vci])->rx_info.pool << SRB_POOL_SHIFT)
- | (tx_vc_bits << SRB_FLAGS_SHIFT) );
- while (command_do (dev, &cmd))
- schedule();
- } else {
- // no RXer on the channel, just open (with pool zero)
- cmd.request = cpu_to_be32 (SRB_OPEN_VC);
- cmd.args.open.vc = cpu_to_be32 (vci); // vpi 0
- cmd.args.open.flags = cpu_to_be32 (tx_vc_bits << SRB_FLAGS_SHIFT);
- cmd.args.open.rate = cpu_to_be32 (tx_rate_bits << SRB_RATE_SHIFT);
- while (command_do (dev, &cmd))
- schedule();
- }
- dev->txer[vci].tx_present = 1;
- mutex_unlock(&dev->vcc_sf);
- }
-
- if (rxtp->traffic_class != ATM_NONE) {
- command cmd;
-
- vcc->rx_info.pool = pool;
-
- mutex_lock(&dev->vcc_sf);
- /* grow RX buffer pool */
- if (!dev->rxq[pool].buffers_wanted)
- dev->rxq[pool].buffers_wanted = rx_lats;
- dev->rxq[pool].buffers_wanted += 1;
- fill_rx_pool (dev, pool, GFP_KERNEL);
-
- if (dev->txer[vci].tx_present) {
- // TXer on the channel already
- // switch (from pool zero) to this pool, preserving the TX bits
- cmd.request = cpu_to_be32 (SRB_MODIFY_VC_FLAGS);
- cmd.args.modify_flags.vc = cpu_to_be32 (vci); // vpi 0
- cmd.args.modify_flags.flags = cpu_to_be32
- ( (pool << SRB_POOL_SHIFT)
- | (dev->txer[vci].tx_vc_bits << SRB_FLAGS_SHIFT) );
- } else {
- // no TXer on the channel, open the VC (with no rate info)
- cmd.request = cpu_to_be32 (SRB_OPEN_VC);
- cmd.args.open.vc = cpu_to_be32 (vci); // vpi 0
- cmd.args.open.flags = cpu_to_be32 (pool << SRB_POOL_SHIFT);
- cmd.args.open.rate = cpu_to_be32 (0);
- }
- while (command_do (dev, &cmd))
- schedule();
- // this link allows RX frames through
- dev->rxer[vci] = atm_vcc;
- mutex_unlock(&dev->vcc_sf);
- }
-
- // indicate readiness
- set_bit(ATM_VF_READY,&atm_vcc->flags);
-
- return 0;
-}
-
-/********** Close a VC **********/
-
-static void amb_close (struct atm_vcc * atm_vcc) {
- amb_dev * dev = AMB_DEV (atm_vcc->dev);
- amb_vcc * vcc = AMB_VCC (atm_vcc);
- u16 vci = atm_vcc->vci;
-
- PRINTD (DBG_VCC|DBG_FLOW, "amb_close");
-
- // indicate unreadiness
- clear_bit(ATM_VF_READY,&atm_vcc->flags);
-
- // disable TXing
- if (atm_vcc->qos.txtp.traffic_class != ATM_NONE) {
- command cmd;
-
- mutex_lock(&dev->vcc_sf);
- if (dev->rxer[vci]) {
- // RXer still on the channel, just modify rate... XXX not really needed
- cmd.request = cpu_to_be32 (SRB_MODIFY_VC_RATE);
- cmd.args.modify_rate.vc = cpu_to_be32 (vci); // vpi 0
- cmd.args.modify_rate.rate = cpu_to_be32 (0);
- // ... and clear TX rate flags (XXX to stop RM cell output?), preserving RX pool
- } else {
- // no RXer on the channel, close channel
- cmd.request = cpu_to_be32 (SRB_CLOSE_VC);
- cmd.args.close.vc = cpu_to_be32 (vci); // vpi 0
- }
- dev->txer[vci].tx_present = 0;
- while (command_do (dev, &cmd))
- schedule();
- mutex_unlock(&dev->vcc_sf);
- }
-
- // disable RXing
- if (atm_vcc->qos.rxtp.traffic_class != ATM_NONE) {
- command cmd;
-
- // this is (the?) one reason why we need the amb_vcc struct
- unsigned char pool = vcc->rx_info.pool;
-
- mutex_lock(&dev->vcc_sf);
- if (dev->txer[vci].tx_present) {
- // TXer still on the channel, just go to pool zero XXX not really needed
- cmd.request = cpu_to_be32 (SRB_MODIFY_VC_FLAGS);
- cmd.args.modify_flags.vc = cpu_to_be32 (vci); // vpi 0
- cmd.args.modify_flags.flags = cpu_to_be32
- (dev->txer[vci].tx_vc_bits << SRB_FLAGS_SHIFT);
- } else {
- // no TXer on the channel, close the VC
- cmd.request = cpu_to_be32 (SRB_CLOSE_VC);
- cmd.args.close.vc = cpu_to_be32 (vci); // vpi 0
- }
- // forget the rxer - no more skbs will be pushed
- if (atm_vcc != dev->rxer[vci])
- PRINTK (KERN_ERR, "%s vcc=%p rxer[vci]=%p",
- "arghhh! we're going to die!",
- vcc, dev->rxer[vci]);
- dev->rxer[vci] = NULL;
- while (command_do (dev, &cmd))
- schedule();
-
- /* shrink RX buffer pool */
- dev->rxq[pool].buffers_wanted -= 1;
- if (dev->rxq[pool].buffers_wanted == rx_lats) {
- dev->rxq[pool].buffers_wanted = 0;
- drain_rx_pool (dev, pool);
- }
- mutex_unlock(&dev->vcc_sf);
- }
-
- // free our structure
- kfree (vcc);
-
- // say the VPI/VCI is free again
- clear_bit(ATM_VF_ADDR,&atm_vcc->flags);
-
- return;
-}
-
-/********** Send **********/
-
-static int amb_send (struct atm_vcc * atm_vcc, struct sk_buff * skb) {
- amb_dev * dev = AMB_DEV(atm_vcc->dev);
- amb_vcc * vcc = AMB_VCC(atm_vcc);
- u16 vc = atm_vcc->vci;
- unsigned int tx_len = skb->len;
- unsigned char * tx_data = skb->data;
- tx_simple * tx_descr;
- tx_in tx;
-
- if (test_bit (dead, &dev->flags))
- return -EIO;
-
- PRINTD (DBG_FLOW|DBG_TX, "amb_send vc %x data %p len %u",
- vc, tx_data, tx_len);
-
- dump_skb (">>>", vc, skb);
-
- if (!dev->txer[vc].tx_present) {
- PRINTK (KERN_ERR, "attempt to send on RX-only VC %x", vc);
- return -EBADFD;
- }
-
- // this is a driver private field so we have to set it ourselves,
- // despite the fact that we are _required_ to use it to check for a
- // pop function
- ATM_SKB(skb)->vcc = atm_vcc;
-
- if (skb->len > (size_t) atm_vcc->qos.txtp.max_sdu) {
- PRINTK (KERN_ERR, "sk_buff length greater than agreed max_sdu, dropping...");
- return -EIO;
- }
-
- if (check_area (skb->data, skb->len)) {
- atomic_inc(&atm_vcc->stats->tx_err);
- return -ENOMEM; // ?
- }
-
- // allocate memory for fragments
- tx_descr = kmalloc (sizeof(tx_simple), GFP_KERNEL);
- if (!tx_descr) {
- PRINTK (KERN_ERR, "could not allocate TX descriptor");
- return -ENOMEM;
- }
- if (check_area (tx_descr, sizeof(tx_simple))) {
- kfree (tx_descr);
- return -ENOMEM;
- }
- PRINTD (DBG_TX, "fragment list allocated at %p", tx_descr);
-
- tx_descr->skb = skb;
-
- tx_descr->tx_frag.bytes = cpu_to_be32 (tx_len);
- tx_descr->tx_frag.address = cpu_to_be32 (virt_to_bus (tx_data));
-
- tx_descr->tx_frag_end.handle = virt_to_bus (tx_descr);
- tx_descr->tx_frag_end.vc = 0;
- tx_descr->tx_frag_end.next_descriptor_length = 0;
- tx_descr->tx_frag_end.next_descriptor = 0;
-#ifdef AMB_NEW_MICROCODE
- tx_descr->tx_frag_end.cpcs_uu = 0;
- tx_descr->tx_frag_end.cpi = 0;
- tx_descr->tx_frag_end.pad = 0;
-#endif
-
- tx.vc = cpu_to_be16 (vcc->tx_frame_bits | vc);
- tx.tx_descr_length = cpu_to_be16 (sizeof(tx_frag)+sizeof(tx_frag_end));
- tx.tx_descr_addr = cpu_to_be32 (virt_to_bus (&tx_descr->tx_frag));
-
- while (tx_give (dev, &tx))
- schedule();
- return 0;
-}
-
-/********** Change QoS on a VC **********/
-
-// int amb_change_qos (struct atm_vcc * atm_vcc, struct atm_qos * qos, int flags);
-
-/********** Free RX Socket Buffer **********/
-
-#if 0
-static void amb_free_rx_skb (struct atm_vcc * atm_vcc, struct sk_buff * skb) {
- amb_dev * dev = AMB_DEV (atm_vcc->dev);
- amb_vcc * vcc = AMB_VCC (atm_vcc);
- unsigned char pool = vcc->rx_info.pool;
- rx_in rx;
-
- // This may be unsafe for various reasons that I cannot really guess
- // at. However, I note that the ATM layer calls kfree_skb rather
- // than dev_kfree_skb at this point so we are least covered as far
- // as buffer locking goes. There may be bugs if pcap clones RX skbs.
-
- PRINTD (DBG_FLOW|DBG_SKB, "amb_rx_free skb %p (atm_vcc %p, vcc %p)",
- skb, atm_vcc, vcc);
-
- rx.handle = virt_to_bus (skb);
- rx.host_address = cpu_to_be32 (virt_to_bus (skb->data));
-
- skb->data = skb->head;
- skb_reset_tail_pointer(skb);
- skb->len = 0;
-
- if (!rx_give (dev, &rx, pool)) {
- // success
- PRINTD (DBG_SKB|DBG_POOL, "recycled skb for pool %hu", pool);
- return;
- }
-
- // just do what the ATM layer would have done
- dev_kfree_skb_any (skb);
-
- return;
-}
-#endif
-
-/********** Proc File Output **********/
-
-static int amb_proc_read (struct atm_dev * atm_dev, loff_t * pos, char * page) {
- amb_dev * dev = AMB_DEV (atm_dev);
- int left = *pos;
- unsigned char pool;
-
- PRINTD (DBG_FLOW, "amb_proc_read");
-
- /* more diagnostics here? */
-
- if (!left--) {
- amb_stats * s = &dev->stats;
- return sprintf (page,
- "frames: TX OK %lu, RX OK %lu, RX bad %lu "
- "(CRC %lu, long %lu, aborted %lu, unused %lu).\n",
- s->tx_ok, s->rx.ok, s->rx.error,
- s->rx.badcrc, s->rx.toolong,
- s->rx.aborted, s->rx.unused);
- }
-
- if (!left--) {
- amb_cq * c = &dev->cq;
- return sprintf (page, "cmd queue [cur/hi/max]: %u/%u/%u. ",
- c->pending, c->high, c->maximum);
- }
-
- if (!left--) {
- amb_txq * t = &dev->txq;
- return sprintf (page, "TX queue [cur/max high full]: %u/%u %u %u.\n",
- t->pending, t->maximum, t->high, t->filled);
- }
-
- if (!left--) {
- unsigned int count = sprintf (page, "RX queues [cur/max/req low empty]:");
- for (pool = 0; pool < NUM_RX_POOLS; ++pool) {
- amb_rxq * r = &dev->rxq[pool];
- count += sprintf (page+count, " %u/%u/%u %u %u",
- r->pending, r->maximum, r->buffers_wanted, r->low, r->emptied);
- }
- count += sprintf (page+count, ".\n");
- return count;
- }
-
- if (!left--) {
- unsigned int count = sprintf (page, "RX buffer sizes:");
- for (pool = 0; pool < NUM_RX_POOLS; ++pool) {
- amb_rxq * r = &dev->rxq[pool];
- count += sprintf (page+count, " %u", r->buffer_size);
- }
- count += sprintf (page+count, ".\n");
- return count;
- }
-
-#if 0
- if (!left--) {
- // suni block etc?
- }
-#endif
-
- return 0;
-}
-
-/********** Operation Structure **********/
-
-static const struct atmdev_ops amb_ops = {
- .open = amb_open,
- .close = amb_close,
- .send = amb_send,
- .proc_read = amb_proc_read,
- .owner = THIS_MODULE,
-};
-
-/********** housekeeping **********/
-static void do_housekeeping (struct timer_list *t) {
- amb_dev * dev = from_timer(dev, t, housekeeping);
-
- // could collect device-specific (not driver/atm-linux) stats here
-
- // last resort refill once every ten seconds
- fill_rx_pools (dev);
- mod_timer(&dev->housekeeping, jiffies + 10*HZ);
-
- return;
-}
-
-/********** creation of communication queues **********/
-
-static int create_queues(amb_dev *dev, unsigned int cmds, unsigned int txs,
- unsigned int *rxs, unsigned int *rx_buffer_sizes)
-{
- unsigned char pool;
- size_t total = 0;
- void * memory;
- void * limit;
-
- PRINTD (DBG_FLOW, "create_queues %p", dev);
-
- total += cmds * sizeof(command);
-
- total += txs * (sizeof(tx_in) + sizeof(tx_out));
-
- for (pool = 0; pool < NUM_RX_POOLS; ++pool)
- total += rxs[pool] * (sizeof(rx_in) + sizeof(rx_out));
-
- memory = kmalloc (total, GFP_KERNEL);
- if (!memory) {
- PRINTK (KERN_ERR, "could not allocate queues");
- return -ENOMEM;
- }
- if (check_area (memory, total)) {
- PRINTK (KERN_ERR, "queues allocated in nasty area");
- kfree (memory);
- return -ENOMEM;
- }
-
- limit = memory + total;
- PRINTD (DBG_INIT, "queues from %p to %p", memory, limit);
-
- PRINTD (DBG_CMD, "command queue at %p", memory);
-
- {
- command * cmd = memory;
- amb_cq * cq = &dev->cq;
-
- cq->pending = 0;
- cq->high = 0;
- cq->maximum = cmds - 1;
-
- cq->ptrs.start = cmd;
- cq->ptrs.in = cmd;
- cq->ptrs.out = cmd;
- cq->ptrs.limit = cmd + cmds;
-
- memory = cq->ptrs.limit;
- }
-
- PRINTD (DBG_TX, "TX queue pair at %p", memory);
-
- {
- tx_in * in = memory;
- tx_out * out;
- amb_txq * txq = &dev->txq;
-
- txq->pending = 0;
- txq->high = 0;
- txq->filled = 0;
- txq->maximum = txs - 1;
-
- txq->in.start = in;
- txq->in.ptr = in;
- txq->in.limit = in + txs;
-
- memory = txq->in.limit;
- out = memory;
-
- txq->out.start = out;
- txq->out.ptr = out;
- txq->out.limit = out + txs;
-
- memory = txq->out.limit;
- }
-
- PRINTD (DBG_RX, "RX queue pairs at %p", memory);
-
- for (pool = 0; pool < NUM_RX_POOLS; ++pool) {
- rx_in * in = memory;
- rx_out * out;
- amb_rxq * rxq = &dev->rxq[pool];
-
- rxq->buffer_size = rx_buffer_sizes[pool];
- rxq->buffers_wanted = 0;
-
- rxq->pending = 0;
- rxq->low = rxs[pool] - 1;
- rxq->emptied = 0;
- rxq->maximum = rxs[pool] - 1;
-
- rxq->in.start = in;
- rxq->in.ptr = in;
- rxq->in.limit = in + rxs[pool];
-
- memory = rxq->in.limit;
- out = memory;
-
- rxq->out.start = out;
- rxq->out.ptr = out;
- rxq->out.limit = out + rxs[pool];
-
- memory = rxq->out.limit;
- }
-
- if (memory == limit) {
- return 0;
- } else {
- PRINTK (KERN_ERR, "bad queue alloc %p != %p (tell maintainer)", memory, limit);
- kfree (limit - total);
- return -ENOMEM;
- }
-
-}
-
-/********** destruction of communication queues **********/
-
-static void destroy_queues (amb_dev * dev) {
- // all queues assumed empty
- void * memory = dev->cq.ptrs.start;
- // includes txq.in, txq.out, rxq[].in and rxq[].out
-
- PRINTD (DBG_FLOW, "destroy_queues %p", dev);
-
- PRINTD (DBG_INIT, "freeing queues at %p", memory);
- kfree (memory);
-
- return;
-}
-
-/********** basic loader commands and error handling **********/
-// centisecond timeouts - guessing away here
-static unsigned int command_timeouts [] = {
- [host_memory_test] = 15,
- [read_adapter_memory] = 2,
- [write_adapter_memory] = 2,
- [adapter_start] = 50,
- [get_version_number] = 10,
- [interrupt_host] = 1,
- [flash_erase_sector] = 1,
- [adap_download_block] = 1,
- [adap_erase_flash] = 1,
- [adap_run_in_iram] = 1,
- [adap_end_download] = 1
-};
-
-
-static unsigned int command_successes [] = {
- [host_memory_test] = COMMAND_PASSED_TEST,
- [read_adapter_memory] = COMMAND_READ_DATA_OK,
- [write_adapter_memory] = COMMAND_WRITE_DATA_OK,
- [adapter_start] = COMMAND_COMPLETE,
- [get_version_number] = COMMAND_COMPLETE,
- [interrupt_host] = COMMAND_COMPLETE,
- [flash_erase_sector] = COMMAND_COMPLETE,
- [adap_download_block] = COMMAND_COMPLETE,
- [adap_erase_flash] = COMMAND_COMPLETE,
- [adap_run_in_iram] = COMMAND_COMPLETE,
- [adap_end_download] = COMMAND_COMPLETE
-};
-
-static int decode_loader_result (loader_command cmd, u32 result)
-{
- int res;
- const char *msg;
-
- if (result == command_successes[cmd])
- return 0;
-
- switch (result) {
- case BAD_COMMAND:
- res = -EINVAL;
- msg = "bad command";
- break;
- case COMMAND_IN_PROGRESS:
- res = -ETIMEDOUT;
- msg = "command in progress";
- break;
- case COMMAND_PASSED_TEST:
- res = 0;
- msg = "command passed test";
- break;
- case COMMAND_FAILED_TEST:
- res = -EIO;
- msg = "command failed test";
- break;
- case COMMAND_READ_DATA_OK:
- res = 0;
- msg = "command read data ok";
- break;
- case COMMAND_READ_BAD_ADDRESS:
- res = -EINVAL;
- msg = "command read bad address";
- break;
- case COMMAND_WRITE_DATA_OK:
- res = 0;
- msg = "command write data ok";
- break;
- case COMMAND_WRITE_BAD_ADDRESS:
- res = -EINVAL;
- msg = "command write bad address";
- break;
- case COMMAND_WRITE_FLASH_FAILURE:
- res = -EIO;
- msg = "command write flash failure";
- break;
- case COMMAND_COMPLETE:
- res = 0;
- msg = "command complete";
- break;
- case COMMAND_FLASH_ERASE_FAILURE:
- res = -EIO;
- msg = "command flash erase failure";
- break;
- case COMMAND_WRITE_BAD_DATA:
- res = -EINVAL;
- msg = "command write bad data";
- break;
- default:
- res = -EINVAL;
- msg = "unknown error";
- PRINTD (DBG_LOAD|DBG_ERR,
- "decode_loader_result got %d=%x !",
- result, result);
- break;
- }
-
- PRINTK (KERN_ERR, "%s", msg);
- return res;
-}
-
-static int do_loader_command(volatile loader_block *lb, const amb_dev *dev,
- loader_command cmd)
-{
-
- unsigned long timeout;
-
- PRINTD (DBG_FLOW|DBG_LOAD, "do_loader_command");
-
- /* do a command
-
- Set the return value to zero, set the command type and set the
- valid entry to the right magic value. The payload is already
- correctly byte-ordered so we leave it alone. Hit the doorbell
- with the bus address of this structure.
-
- */
-
- lb->result = 0;
- lb->command = cpu_to_be32 (cmd);
- lb->valid = cpu_to_be32 (DMA_VALID);
- // dump_registers (dev);
- // dump_loader_block (lb);
- wr_mem (dev, offsetof(amb_mem, doorbell), virt_to_bus (lb) & ~onegigmask);
-
- timeout = command_timeouts[cmd] * 10;
-
- while (!lb->result || lb->result == cpu_to_be32 (COMMAND_IN_PROGRESS))
- if (timeout) {
- timeout = msleep_interruptible(timeout);
- } else {
- PRINTD (DBG_LOAD|DBG_ERR, "command %d timed out", cmd);
- dump_registers (dev);
- dump_loader_block (lb);
- return -ETIMEDOUT;
- }
-
- if (cmd == adapter_start) {
- // wait for start command to acknowledge...
- timeout = 100;
- while (rd_plain (dev, offsetof(amb_mem, doorbell)))
- if (timeout) {
- timeout = msleep_interruptible(timeout);
- } else {
- PRINTD (DBG_LOAD|DBG_ERR, "start command did not clear doorbell, res=%08x",
- be32_to_cpu (lb->result));
- dump_registers (dev);
- return -ETIMEDOUT;
- }
- return 0;
- } else {
- return decode_loader_result (cmd, be32_to_cpu (lb->result));
- }
-
-}
-
-/* loader: determine loader version */
-
-static int get_loader_version(loader_block *lb, const amb_dev *dev,
- u32 *version)
-{
- int res;
-
- PRINTD (DBG_FLOW|DBG_LOAD, "get_loader_version");
-
- res = do_loader_command (lb, dev, get_version_number);
- if (res)
- return res;
- if (version)
- *version = be32_to_cpu (lb->payload.version);
- return 0;
-}
-
-/* loader: write memory data blocks */
-
-static int loader_write(loader_block *lb, const amb_dev *dev,
- const struct ihex_binrec *rec)
-{
- transfer_block * tb = &lb->payload.transfer;
-
- PRINTD (DBG_FLOW|DBG_LOAD, "loader_write");
-
- tb->address = rec->addr;
- tb->count = cpu_to_be32(be16_to_cpu(rec->len) / 4);
- memcpy(tb->data, rec->data, be16_to_cpu(rec->len));
- return do_loader_command (lb, dev, write_adapter_memory);
-}
-
-/* loader: verify memory data blocks */
-
-static int loader_verify(loader_block *lb, const amb_dev *dev,
- const struct ihex_binrec *rec)
-{
- transfer_block * tb = &lb->payload.transfer;
- int res;
-
- PRINTD (DBG_FLOW|DBG_LOAD, "loader_verify");
-
- tb->address = rec->addr;
- tb->count = cpu_to_be32(be16_to_cpu(rec->len) / 4);
- res = do_loader_command (lb, dev, read_adapter_memory);
- if (!res && memcmp(tb->data, rec->data, be16_to_cpu(rec->len)))
- res = -EINVAL;
- return res;
-}
-
-/* loader: start microcode */
-
-static int loader_start(loader_block *lb, const amb_dev *dev, u32 address)
-{
- PRINTD (DBG_FLOW|DBG_LOAD, "loader_start");
-
- lb->payload.start = cpu_to_be32 (address);
- return do_loader_command (lb, dev, adapter_start);
-}
-
-/********** reset card **********/
-
-static inline void sf (const char * msg)
-{
- PRINTK (KERN_ERR, "self-test failed: %s", msg);
-}
-
-static int amb_reset (amb_dev * dev, int diags) {
- u32 word;
-
- PRINTD (DBG_FLOW|DBG_LOAD, "amb_reset");
-
- word = rd_plain (dev, offsetof(amb_mem, reset_control));
- // put card into reset state
- wr_plain (dev, offsetof(amb_mem, reset_control), word | AMB_RESET_BITS);
- // wait a short while
- udelay (10);
-#if 1
- // put card into known good state
- wr_plain (dev, offsetof(amb_mem, interrupt_control), AMB_DOORBELL_BITS);
- // clear all interrupts just in case
- wr_plain (dev, offsetof(amb_mem, interrupt), -1);
-#endif
- // clear self-test done flag
- wr_plain (dev, offsetof(amb_mem, mb.loader.ready), 0);
- // take card out of reset state
- wr_plain (dev, offsetof(amb_mem, reset_control), word &~ AMB_RESET_BITS);
-
- if (diags) {
- unsigned long timeout;
- // 4.2 second wait
- msleep(4200);
- // half second time-out
- timeout = 500;
- while (!rd_plain (dev, offsetof(amb_mem, mb.loader.ready)))
- if (timeout) {
- timeout = msleep_interruptible(timeout);
- } else {
- PRINTD (DBG_LOAD|DBG_ERR, "reset timed out");
- return -ETIMEDOUT;
- }
-
- // get results of self-test
- // XXX double check byte-order
- word = rd_mem (dev, offsetof(amb_mem, mb.loader.result));
- if (word & SELF_TEST_FAILURE) {
- if (word & GPINT_TST_FAILURE)
- sf ("interrupt");
- if (word & SUNI_DATA_PATTERN_FAILURE)
- sf ("SUNI data pattern");
- if (word & SUNI_DATA_BITS_FAILURE)
- sf ("SUNI data bits");
- if (word & SUNI_UTOPIA_FAILURE)
- sf ("SUNI UTOPIA interface");
- if (word & SUNI_FIFO_FAILURE)
- sf ("SUNI cell buffer FIFO");
- if (word & SRAM_FAILURE)
- sf ("bad SRAM");
- // better return value?
- return -EIO;
- }
-
- }
- return 0;
-}
-
-/********** transfer and start the microcode **********/
-
-static int ucode_init(loader_block *lb, amb_dev *dev)
-{
- const struct firmware *fw;
- unsigned long start_address;
- const struct ihex_binrec *rec;
- const char *errmsg = NULL;
- int res;
-
- res = request_ihex_firmware(&fw, "atmsar11.fw", &dev->pci_dev->dev);
- if (res) {
- PRINTK (KERN_ERR, "Cannot load microcode data");
- return res;
- }
-
- /* First record contains just the start address */
- rec = (const struct ihex_binrec *)fw->data;
- if (be16_to_cpu(rec->len) != sizeof(__be32) || be32_to_cpu(rec->addr)) {
- errmsg = "no start record";
- goto fail;
- }
- start_address = be32_to_cpup((__be32 *)rec->data);
-
- rec = ihex_next_binrec(rec);
-
- PRINTD (DBG_FLOW|DBG_LOAD, "ucode_init");
-
- while (rec) {
- PRINTD (DBG_LOAD, "starting region (%x, %u)", be32_to_cpu(rec->addr),
- be16_to_cpu(rec->len));
- if (be16_to_cpu(rec->len) > 4 * MAX_TRANSFER_DATA) {
- errmsg = "record too long";
- goto fail;
- }
- if (be16_to_cpu(rec->len) & 3) {
- errmsg = "odd number of bytes";
- goto fail;
- }
- res = loader_write(lb, dev, rec);
- if (res)
- break;
-
- res = loader_verify(lb, dev, rec);
- if (res)
- break;
- rec = ihex_next_binrec(rec);
- }
- release_firmware(fw);
- if (!res)
- res = loader_start(lb, dev, start_address);
-
- return res;
-fail:
- release_firmware(fw);
- PRINTK(KERN_ERR, "Bad microcode data (%s)", errmsg);
- return -EINVAL;
-}
-
-/********** give adapter parameters **********/
-
-static inline __be32 bus_addr(void * addr) {
- return cpu_to_be32 (virt_to_bus (addr));
-}
-
-static int amb_talk(amb_dev *dev)
-{
- adap_talk_block a;
- unsigned char pool;
- unsigned long timeout;
-
- PRINTD (DBG_FLOW, "amb_talk %p", dev);
-
- a.command_start = bus_addr (dev->cq.ptrs.start);
- a.command_end = bus_addr (dev->cq.ptrs.limit);
- a.tx_start = bus_addr (dev->txq.in.start);
- a.tx_end = bus_addr (dev->txq.in.limit);
- a.txcom_start = bus_addr (dev->txq.out.start);
- a.txcom_end = bus_addr (dev->txq.out.limit);
-
- for (pool = 0; pool < NUM_RX_POOLS; ++pool) {
- // the other "a" items are set up by the adapter
- a.rec_struct[pool].buffer_start = bus_addr (dev->rxq[pool].in.start);
- a.rec_struct[pool].buffer_end = bus_addr (dev->rxq[pool].in.limit);
- a.rec_struct[pool].rx_start = bus_addr (dev->rxq[pool].out.start);
- a.rec_struct[pool].rx_end = bus_addr (dev->rxq[pool].out.limit);
- a.rec_struct[pool].buffer_size = cpu_to_be32 (dev->rxq[pool].buffer_size);
- }
-
-#ifdef AMB_NEW_MICROCODE
- // disable fast PLX prefetching
- a.init_flags = 0;
-#endif
-
- // pass the structure
- wr_mem (dev, offsetof(amb_mem, doorbell), virt_to_bus (&a));
-
- // 2.2 second wait (must not touch doorbell during 2 second DMA test)
- msleep(2200);
- // give the adapter another half second?
- timeout = 500;
- while (rd_plain (dev, offsetof(amb_mem, doorbell)))
- if (timeout) {
- timeout = msleep_interruptible(timeout);
- } else {
- PRINTD (DBG_INIT|DBG_ERR, "adapter init timed out");
- return -ETIMEDOUT;
- }
-
- return 0;
-}
-
-// get microcode version
-static void amb_ucode_version(amb_dev *dev)
-{
- u32 major;
- u32 minor;
- command cmd;
- cmd.request = cpu_to_be32 (SRB_GET_VERSION);
- while (command_do (dev, &cmd)) {
- set_current_state(TASK_UNINTERRUPTIBLE);
- schedule();
- }
- major = be32_to_cpu (cmd.args.version.major);
- minor = be32_to_cpu (cmd.args.version.minor);
- PRINTK (KERN_INFO, "microcode version is %u.%u", major, minor);
-}
-
-// get end station address
-static void amb_esi(amb_dev *dev, u8 *esi)
-{
- u32 lower4;
- u16 upper2;
- command cmd;
-
- cmd.request = cpu_to_be32 (SRB_GET_BIA);
- while (command_do (dev, &cmd)) {
- set_current_state(TASK_UNINTERRUPTIBLE);
- schedule();
- }
- lower4 = be32_to_cpu (cmd.args.bia.lower4);
- upper2 = be32_to_cpu (cmd.args.bia.upper2);
- PRINTD (DBG_LOAD, "BIA: lower4: %08x, upper2 %04x", lower4, upper2);
-
- if (esi) {
- unsigned int i;
-
- PRINTDB (DBG_INIT, "ESI:");
- for (i = 0; i < ESI_LEN; ++i) {
- if (i < 4)
- esi[i] = bitrev8(lower4>>(8*i));
- else
- esi[i] = bitrev8(upper2>>(8*(i-4)));
- PRINTDM (DBG_INIT, " %02x", esi[i]);
- }
-
- PRINTDE (DBG_INIT, "");
- }
-
- return;
-}
-
-static void fixup_plx_window (amb_dev *dev, loader_block *lb)
-{
- // fix up the PLX-mapped window base address to match the block
- unsigned long blb;
- u32 mapreg;
- blb = virt_to_bus(lb);
- // the kernel stack had better not ever cross a 1Gb boundary!
- mapreg = rd_plain (dev, offsetof(amb_mem, stuff[10]));
- mapreg &= ~onegigmask;
- mapreg |= blb & onegigmask;
- wr_plain (dev, offsetof(amb_mem, stuff[10]), mapreg);
- return;
-}
-
-static int amb_init(amb_dev *dev)
-{
- loader_block lb;
-
- u32 version;
-
- if (amb_reset (dev, 1)) {
- PRINTK (KERN_ERR, "card reset failed!");
- } else {
- fixup_plx_window (dev, &lb);
-
- if (get_loader_version (&lb, dev, &version)) {
- PRINTK (KERN_INFO, "failed to get loader version");
- } else {
- PRINTK (KERN_INFO, "loader version is %08x", version);
-
- if (ucode_init (&lb, dev)) {
- PRINTK (KERN_ERR, "microcode failure");
- } else if (create_queues (dev, cmds, txs, rxs, rxs_bs)) {
- PRINTK (KERN_ERR, "failed to get memory for queues");
- } else {
-
- if (amb_talk (dev)) {
- PRINTK (KERN_ERR, "adapter did not accept queues");
- } else {
-
- amb_ucode_version (dev);
- return 0;
-
- } /* amb_talk */
-
- destroy_queues (dev);
- } /* create_queues, ucode_init */
-
- amb_reset (dev, 0);
- } /* get_loader_version */
-
- } /* amb_reset */
-
- return -EINVAL;
-}
-
-static void setup_dev(amb_dev *dev, struct pci_dev *pci_dev)
-{
- unsigned char pool;
-
- // set up known dev items straight away
- dev->pci_dev = pci_dev;
- pci_set_drvdata(pci_dev, dev);
-
- dev->iobase = pci_resource_start (pci_dev, 1);
- dev->irq = pci_dev->irq;
- dev->membase = bus_to_virt(pci_resource_start(pci_dev, 0));
-
- // flags (currently only dead)
- dev->flags = 0;
-
- // Allocate cell rates (fibre)
- // ATM_OC3_PCR = 1555200000/8/270*260/53 - 29/53
- // to be really pedantic, this should be ATM_OC3c_PCR
- dev->tx_avail = ATM_OC3_PCR;
- dev->rx_avail = ATM_OC3_PCR;
-
- // semaphore for txer/rxer modifications - we cannot use a
- // spinlock as the critical region needs to switch processes
- mutex_init(&dev->vcc_sf);
- // queue manipulation spinlocks; we want atomic reads and
- // writes to the queue descriptors (handles IRQ and SMP)
- // consider replacing "int pending" -> "atomic_t available"
- // => problem related to who gets to move queue pointers
- spin_lock_init (&dev->cq.lock);
- spin_lock_init (&dev->txq.lock);
- for (pool = 0; pool < NUM_RX_POOLS; ++pool)
- spin_lock_init (&dev->rxq[pool].lock);
-}
-
-static void setup_pci_dev(struct pci_dev *pci_dev)
-{
- unsigned char lat;
-
- // enable bus master accesses
- pci_set_master(pci_dev);
-
- // frobnicate latency (upwards, usually)
- pci_read_config_byte (pci_dev, PCI_LATENCY_TIMER, &lat);
-
- if (!pci_lat)
- pci_lat = (lat < MIN_PCI_LATENCY) ? MIN_PCI_LATENCY : lat;
-
- if (lat != pci_lat) {
- PRINTK (KERN_INFO, "Changing PCI latency timer from %hu to %hu",
- lat, pci_lat);
- pci_write_config_byte(pci_dev, PCI_LATENCY_TIMER, pci_lat);
- }
-}
-
-static int amb_probe(struct pci_dev *pci_dev,
- const struct pci_device_id *pci_ent)
-{
- amb_dev * dev;
- int err;
- unsigned int irq;
-
- err = pci_enable_device(pci_dev);
- if (err < 0) {
- PRINTK (KERN_ERR, "skipped broken (PLX rev 2) card");
- goto out;
- }
-
- // read resources from PCI configuration space
- irq = pci_dev->irq;
-
- if (pci_dev->device == PCI_DEVICE_ID_MADGE_AMBASSADOR_BAD) {
- PRINTK (KERN_ERR, "skipped broken (PLX rev 2) card");
- err = -EINVAL;
- goto out_disable;
- }
-
- PRINTD (DBG_INFO, "found Madge ATM adapter (amb) at"
- " IO %llx, IRQ %u, MEM %p",
- (unsigned long long)pci_resource_start(pci_dev, 1),
- irq, bus_to_virt(pci_resource_start(pci_dev, 0)));
-
- // check IO region
- err = pci_request_region(pci_dev, 1, DEV_LABEL);
- if (err < 0) {
- PRINTK (KERN_ERR, "IO range already in use!");
- goto out_disable;
- }
-
- dev = kzalloc(sizeof(amb_dev), GFP_KERNEL);
- if (!dev) {
- PRINTK (KERN_ERR, "out of memory!");
- err = -ENOMEM;
- goto out_release;
- }
-
- setup_dev(dev, pci_dev);
-
- err = amb_init(dev);
- if (err < 0) {
- PRINTK (KERN_ERR, "adapter initialisation failure");
- goto out_free;
- }
-
- setup_pci_dev(pci_dev);
-
- // grab (but share) IRQ and install handler
- err = request_irq(irq, interrupt_handler, IRQF_SHARED, DEV_LABEL, dev);
- if (err < 0) {
- PRINTK (KERN_ERR, "request IRQ failed!");
- goto out_reset;
- }
-
- dev->atm_dev = atm_dev_register (DEV_LABEL, &pci_dev->dev, &amb_ops, -1,
- NULL);
- if (!dev->atm_dev) {
- PRINTD (DBG_ERR, "failed to register Madge ATM adapter");
- err = -EINVAL;
- goto out_free_irq;
- }
-
- PRINTD (DBG_INFO, "registered Madge ATM adapter (no. %d) (%p) at %p",
- dev->atm_dev->number, dev, dev->atm_dev);
- dev->atm_dev->dev_data = (void *) dev;
-
- // register our address
- amb_esi (dev, dev->atm_dev->esi);
-
- // 0 bits for vpi, 10 bits for vci
- dev->atm_dev->ci_range.vpi_bits = NUM_VPI_BITS;
- dev->atm_dev->ci_range.vci_bits = NUM_VCI_BITS;
-
- timer_setup(&dev->housekeeping, do_housekeeping, 0);
- mod_timer(&dev->housekeeping, jiffies);
-
- // enable host interrupts
- interrupts_on (dev);
-
-out:
- return err;
-
-out_free_irq:
- free_irq(irq, dev);
-out_reset:
- amb_reset(dev, 0);
-out_free:
- kfree(dev);
-out_release:
- pci_release_region(pci_dev, 1);
-out_disable:
- pci_disable_device(pci_dev);
- goto out;
-}
-
-
-static void amb_remove_one(struct pci_dev *pci_dev)
-{
- struct amb_dev *dev;
-
- dev = pci_get_drvdata(pci_dev);
-
- PRINTD(DBG_INFO|DBG_INIT, "closing %p (atm_dev = %p)", dev, dev->atm_dev);
- del_timer_sync(&dev->housekeeping);
- // the drain should not be necessary
- drain_rx_pools(dev);
- interrupts_off(dev);
- amb_reset(dev, 0);
- free_irq(dev->irq, dev);
- pci_disable_device(pci_dev);
- destroy_queues(dev);
- atm_dev_deregister(dev->atm_dev);
- kfree(dev);
- pci_release_region(pci_dev, 1);
-}
-
-static void __init amb_check_args (void) {
- unsigned char pool;
- unsigned int max_rx_size;
-
-#ifdef DEBUG_AMBASSADOR
- PRINTK (KERN_NOTICE, "debug bitmap is %hx", debug &= DBG_MASK);
-#else
- if (debug)
- PRINTK (KERN_NOTICE, "no debugging support");
-#endif
-
- if (cmds < MIN_QUEUE_SIZE)
- PRINTK (KERN_NOTICE, "cmds has been raised to %u",
- cmds = MIN_QUEUE_SIZE);
-
- if (txs < MIN_QUEUE_SIZE)
- PRINTK (KERN_NOTICE, "txs has been raised to %u",
- txs = MIN_QUEUE_SIZE);
-
- for (pool = 0; pool < NUM_RX_POOLS; ++pool)
- if (rxs[pool] < MIN_QUEUE_SIZE)
- PRINTK (KERN_NOTICE, "rxs[%hu] has been raised to %u",
- pool, rxs[pool] = MIN_QUEUE_SIZE);
-
- // buffers sizes should be greater than zero and strictly increasing
- max_rx_size = 0;
- for (pool = 0; pool < NUM_RX_POOLS; ++pool)
- if (rxs_bs[pool] <= max_rx_size)
- PRINTK (KERN_NOTICE, "useless pool (rxs_bs[%hu] = %u)",
- pool, rxs_bs[pool]);
- else
- max_rx_size = rxs_bs[pool];
-
- if (rx_lats < MIN_RX_BUFFERS)
- PRINTK (KERN_NOTICE, "rx_lats has been raised to %u",
- rx_lats = MIN_RX_BUFFERS);
-
- return;
-}
-
-/********** module stuff **********/
-
-MODULE_AUTHOR(maintainer_string);
-MODULE_DESCRIPTION(description_string);
-MODULE_LICENSE("GPL");
-MODULE_FIRMWARE("atmsar11.fw");
-module_param(debug, ushort, 0644);
-module_param(cmds, uint, 0);
-module_param(txs, uint, 0);
-module_param_array(rxs, uint, NULL, 0);
-module_param_array(rxs_bs, uint, NULL, 0);
-module_param(rx_lats, uint, 0);
-module_param(pci_lat, byte, 0);
-MODULE_PARM_DESC(debug, "debug bitmap, see .h file");
-MODULE_PARM_DESC(cmds, "number of command queue entries");
-MODULE_PARM_DESC(txs, "number of TX queue entries");
-MODULE_PARM_DESC(rxs, "number of RX queue entries [" __MODULE_STRING(NUM_RX_POOLS) "]");
-MODULE_PARM_DESC(rxs_bs, "size of RX buffers [" __MODULE_STRING(NUM_RX_POOLS) "]");
-MODULE_PARM_DESC(rx_lats, "number of extra buffers to cope with RX latencies");
-MODULE_PARM_DESC(pci_lat, "PCI latency in bus cycles");
-
-/********** module entry **********/
-
-static const struct pci_device_id amb_pci_tbl[] = {
- { PCI_VDEVICE(MADGE, PCI_DEVICE_ID_MADGE_AMBASSADOR), 0 },
- { PCI_VDEVICE(MADGE, PCI_DEVICE_ID_MADGE_AMBASSADOR_BAD), 0 },
- { 0, }
-};
-
-MODULE_DEVICE_TABLE(pci, amb_pci_tbl);
-
-static struct pci_driver amb_driver = {
- .name = "amb",
- .probe = amb_probe,
- .remove = amb_remove_one,
- .id_table = amb_pci_tbl,
-};
-
-static int __init amb_module_init (void)
-{
- PRINTD (DBG_FLOW|DBG_INIT, "init_module");
-
- BUILD_BUG_ON(sizeof(amb_mem) != 4*16 + 4*12);
-
- show_version();
-
- amb_check_args();
-
- // get the juice
- return pci_register_driver(&amb_driver);
-}
-
-/********** module exit **********/
-
-static void __exit amb_module_exit (void)
-{
- PRINTD (DBG_FLOW|DBG_INIT, "cleanup_module");
-
- pci_unregister_driver(&amb_driver);
-}
-
-module_init(amb_module_init);
-module_exit(amb_module_exit);