diff options
Diffstat (limited to 'drivers/net/wireless/b43legacy/dma.c')
| -rw-r--r-- | drivers/net/wireless/b43legacy/dma.c | 1455 |
1 files changed, 0 insertions, 1455 deletions
diff --git a/drivers/net/wireless/b43legacy/dma.c b/drivers/net/wireless/b43legacy/dma.c deleted file mode 100644 index f9dd892b9..000000000 --- a/drivers/net/wireless/b43legacy/dma.c +++ /dev/null @@ -1,1455 +0,0 @@ -/* - - Broadcom B43legacy wireless driver - - DMA ringbuffer and descriptor allocation/management - - Copyright (c) 2005, 2006 Michael Buesch <m@bues.ch> - - Some code in this file is derived from the b44.c driver - Copyright (C) 2002 David S. Miller - Copyright (C) Pekka Pietikainen - - This program is free software; you can redistribute it and/or modify - it under the terms of the GNU General Public License as published by - the Free Software Foundation; either version 2 of the License, or - (at your option) any later version. - - This 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. - - You should have received a copy of the GNU General Public License - along with this program; see the file COPYING. If not, write to - the Free Software Foundation, Inc., 51 Franklin Steet, Fifth Floor, - Boston, MA 02110-1301, USA. - -*/ - -#include "b43legacy.h" -#include "dma.h" -#include "main.h" -#include "debugfs.h" -#include "xmit.h" - -#include <linux/dma-mapping.h> -#include <linux/pci.h> -#include <linux/delay.h> -#include <linux/skbuff.h> -#include <linux/slab.h> -#include <net/dst.h> - -/* 32bit DMA ops. */ -static -struct b43legacy_dmadesc32 *op32_idx2desc(struct b43legacy_dmaring *ring, - int slot, - struct b43legacy_dmadesc_meta **meta) -{ - struct b43legacy_dmadesc32 *desc; - - *meta = &(ring->meta[slot]); - desc = ring->descbase; - desc = &(desc[slot]); - - return desc; -} - -static void op32_fill_descriptor(struct b43legacy_dmaring *ring, - struct b43legacy_dmadesc32 *desc, - dma_addr_t dmaaddr, u16 bufsize, - int start, int end, int irq) -{ - struct b43legacy_dmadesc32 *descbase = ring->descbase; - int slot; - u32 ctl; - u32 addr; - u32 addrext; - - slot = (int)(desc - descbase); - B43legacy_WARN_ON(!(slot >= 0 && slot < ring->nr_slots)); - - addr = (u32)(dmaaddr & ~SSB_DMA_TRANSLATION_MASK); - addrext = (u32)(dmaaddr & SSB_DMA_TRANSLATION_MASK) - >> SSB_DMA_TRANSLATION_SHIFT; - addr |= ring->dev->dma.translation; - ctl = (bufsize - ring->frameoffset) - & B43legacy_DMA32_DCTL_BYTECNT; - if (slot == ring->nr_slots - 1) - ctl |= B43legacy_DMA32_DCTL_DTABLEEND; - if (start) - ctl |= B43legacy_DMA32_DCTL_FRAMESTART; - if (end) - ctl |= B43legacy_DMA32_DCTL_FRAMEEND; - if (irq) - ctl |= B43legacy_DMA32_DCTL_IRQ; - ctl |= (addrext << B43legacy_DMA32_DCTL_ADDREXT_SHIFT) - & B43legacy_DMA32_DCTL_ADDREXT_MASK; - - desc->control = cpu_to_le32(ctl); - desc->address = cpu_to_le32(addr); -} - -static void op32_poke_tx(struct b43legacy_dmaring *ring, int slot) -{ - b43legacy_dma_write(ring, B43legacy_DMA32_TXINDEX, - (u32)(slot * sizeof(struct b43legacy_dmadesc32))); -} - -static void op32_tx_suspend(struct b43legacy_dmaring *ring) -{ - b43legacy_dma_write(ring, B43legacy_DMA32_TXCTL, - b43legacy_dma_read(ring, B43legacy_DMA32_TXCTL) - | B43legacy_DMA32_TXSUSPEND); -} - -static void op32_tx_resume(struct b43legacy_dmaring *ring) -{ - b43legacy_dma_write(ring, B43legacy_DMA32_TXCTL, - b43legacy_dma_read(ring, B43legacy_DMA32_TXCTL) - & ~B43legacy_DMA32_TXSUSPEND); -} - -static int op32_get_current_rxslot(struct b43legacy_dmaring *ring) -{ - u32 val; - - val = b43legacy_dma_read(ring, B43legacy_DMA32_RXSTATUS); - val &= B43legacy_DMA32_RXDPTR; - - return (val / sizeof(struct b43legacy_dmadesc32)); -} - -static void op32_set_current_rxslot(struct b43legacy_dmaring *ring, - int slot) -{ - b43legacy_dma_write(ring, B43legacy_DMA32_RXINDEX, - (u32)(slot * sizeof(struct b43legacy_dmadesc32))); -} - -static inline int free_slots(struct b43legacy_dmaring *ring) -{ - return (ring->nr_slots - ring->used_slots); -} - -static inline int next_slot(struct b43legacy_dmaring *ring, int slot) -{ - B43legacy_WARN_ON(!(slot >= -1 && slot <= ring->nr_slots - 1)); - if (slot == ring->nr_slots - 1) - return 0; - return slot + 1; -} - -static inline int prev_slot(struct b43legacy_dmaring *ring, int slot) -{ - B43legacy_WARN_ON(!(slot >= 0 && slot <= ring->nr_slots - 1)); - if (slot == 0) - return ring->nr_slots - 1; - return slot - 1; -} - -#ifdef CONFIG_B43LEGACY_DEBUG -static void update_max_used_slots(struct b43legacy_dmaring *ring, - int current_used_slots) -{ - if (current_used_slots <= ring->max_used_slots) - return; - ring->max_used_slots = current_used_slots; - if (b43legacy_debug(ring->dev, B43legacy_DBG_DMAVERBOSE)) - b43legacydbg(ring->dev->wl, - "max_used_slots increased to %d on %s ring %d\n", - ring->max_used_slots, - ring->tx ? "TX" : "RX", - ring->index); -} -#else -static inline -void update_max_used_slots(struct b43legacy_dmaring *ring, - int current_used_slots) -{ } -#endif /* DEBUG */ - -/* Request a slot for usage. */ -static inline -int request_slot(struct b43legacy_dmaring *ring) -{ - int slot; - - B43legacy_WARN_ON(!ring->tx); - B43legacy_WARN_ON(ring->stopped); - B43legacy_WARN_ON(free_slots(ring) == 0); - - slot = next_slot(ring, ring->current_slot); - ring->current_slot = slot; - ring->used_slots++; - - update_max_used_slots(ring, ring->used_slots); - - return slot; -} - -/* Mac80211-queue to b43legacy-ring mapping */ -static struct b43legacy_dmaring *priority_to_txring( - struct b43legacy_wldev *dev, - int queue_priority) -{ - struct b43legacy_dmaring *ring; - -/*FIXME: For now we always run on TX-ring-1 */ -return dev->dma.tx_ring1; - - /* 0 = highest priority */ - switch (queue_priority) { - default: - B43legacy_WARN_ON(1); - /* fallthrough */ - case 0: - ring = dev->dma.tx_ring3; - break; - case 1: - ring = dev->dma.tx_ring2; - break; - case 2: - ring = dev->dma.tx_ring1; - break; - case 3: - ring = dev->dma.tx_ring0; - break; - case 4: - ring = dev->dma.tx_ring4; - break; - case 5: - ring = dev->dma.tx_ring5; - break; - } - - return ring; -} - -/* Bcm4301-ring to mac80211-queue mapping */ -static inline int txring_to_priority(struct b43legacy_dmaring *ring) -{ - static const u8 idx_to_prio[] = - { 3, 2, 1, 0, 4, 5, }; - -/*FIXME: have only one queue, for now */ -return 0; - - return idx_to_prio[ring->index]; -} - - -static u16 b43legacy_dmacontroller_base(enum b43legacy_dmatype type, - int controller_idx) -{ - static const u16 map32[] = { - B43legacy_MMIO_DMA32_BASE0, - B43legacy_MMIO_DMA32_BASE1, - B43legacy_MMIO_DMA32_BASE2, - B43legacy_MMIO_DMA32_BASE3, - B43legacy_MMIO_DMA32_BASE4, - B43legacy_MMIO_DMA32_BASE5, - }; - - B43legacy_WARN_ON(!(controller_idx >= 0 && - controller_idx < ARRAY_SIZE(map32))); - return map32[controller_idx]; -} - -static inline -dma_addr_t map_descbuffer(struct b43legacy_dmaring *ring, - unsigned char *buf, - size_t len, - int tx) -{ - dma_addr_t dmaaddr; - - if (tx) - dmaaddr = dma_map_single(ring->dev->dev->dma_dev, - buf, len, - DMA_TO_DEVICE); - else - dmaaddr = dma_map_single(ring->dev->dev->dma_dev, - buf, len, - DMA_FROM_DEVICE); - - return dmaaddr; -} - -static inline -void unmap_descbuffer(struct b43legacy_dmaring *ring, - dma_addr_t addr, - size_t len, - int tx) -{ - if (tx) - dma_unmap_single(ring->dev->dev->dma_dev, - addr, len, - DMA_TO_DEVICE); - else - dma_unmap_single(ring->dev->dev->dma_dev, - addr, len, - DMA_FROM_DEVICE); -} - -static inline -void sync_descbuffer_for_cpu(struct b43legacy_dmaring *ring, - dma_addr_t addr, - size_t len) -{ - B43legacy_WARN_ON(ring->tx); - - dma_sync_single_for_cpu(ring->dev->dev->dma_dev, - addr, len, DMA_FROM_DEVICE); -} - -static inline -void sync_descbuffer_for_device(struct b43legacy_dmaring *ring, - dma_addr_t addr, - size_t len) -{ - B43legacy_WARN_ON(ring->tx); - - dma_sync_single_for_device(ring->dev->dev->dma_dev, - addr, len, DMA_FROM_DEVICE); -} - -static inline -void free_descriptor_buffer(struct b43legacy_dmaring *ring, - struct b43legacy_dmadesc_meta *meta, - int irq_context) -{ - if (meta->skb) { - if (irq_context) - dev_kfree_skb_irq(meta->skb); - else - dev_kfree_skb(meta->skb); - meta->skb = NULL; - } -} - -static int alloc_ringmemory(struct b43legacy_dmaring *ring) -{ - /* GFP flags must match the flags in free_ringmemory()! */ - ring->descbase = dma_zalloc_coherent(ring->dev->dev->dma_dev, - B43legacy_DMA_RINGMEMSIZE, - &(ring->dmabase), GFP_KERNEL); - if (!ring->descbase) - return -ENOMEM; - - return 0; -} - -static void free_ringmemory(struct b43legacy_dmaring *ring) -{ - dma_free_coherent(ring->dev->dev->dma_dev, B43legacy_DMA_RINGMEMSIZE, - ring->descbase, ring->dmabase); -} - -/* Reset the RX DMA channel */ -static int b43legacy_dmacontroller_rx_reset(struct b43legacy_wldev *dev, - u16 mmio_base, - enum b43legacy_dmatype type) -{ - int i; - u32 value; - u16 offset; - - might_sleep(); - - offset = B43legacy_DMA32_RXCTL; - b43legacy_write32(dev, mmio_base + offset, 0); - for (i = 0; i < 10; i++) { - offset = B43legacy_DMA32_RXSTATUS; - value = b43legacy_read32(dev, mmio_base + offset); - value &= B43legacy_DMA32_RXSTATE; - if (value == B43legacy_DMA32_RXSTAT_DISABLED) { - i = -1; - break; - } - msleep(1); - } - if (i != -1) { - b43legacyerr(dev->wl, "DMA RX reset timed out\n"); - return -ENODEV; - } - - return 0; -} - -/* Reset the RX DMA channel */ -static int b43legacy_dmacontroller_tx_reset(struct b43legacy_wldev *dev, - u16 mmio_base, - enum b43legacy_dmatype type) -{ - int i; - u32 value; - u16 offset; - - might_sleep(); - - for (i = 0; i < 10; i++) { - offset = B43legacy_DMA32_TXSTATUS; - value = b43legacy_read32(dev, mmio_base + offset); - value &= B43legacy_DMA32_TXSTATE; - if (value == B43legacy_DMA32_TXSTAT_DISABLED || - value == B43legacy_DMA32_TXSTAT_IDLEWAIT || - value == B43legacy_DMA32_TXSTAT_STOPPED) - break; - msleep(1); - } - offset = B43legacy_DMA32_TXCTL; - b43legacy_write32(dev, mmio_base + offset, 0); - for (i = 0; i < 10; i++) { - offset = B43legacy_DMA32_TXSTATUS; - value = b43legacy_read32(dev, mmio_base + offset); - value &= B43legacy_DMA32_TXSTATE; - if (value == B43legacy_DMA32_TXSTAT_DISABLED) { - i = -1; - break; - } - msleep(1); - } - if (i != -1) { - b43legacyerr(dev->wl, "DMA TX reset timed out\n"); - return -ENODEV; - } - /* ensure the reset is completed. */ - msleep(1); - - return 0; -} - -/* Check if a DMA mapping address is invalid. */ -static bool b43legacy_dma_mapping_error(struct b43legacy_dmaring *ring, - dma_addr_t addr, - size_t buffersize, - bool dma_to_device) -{ - if (unlikely(dma_mapping_error(ring->dev->dev->dma_dev, addr))) - return true; - - switch (ring->type) { - case B43legacy_DMA_30BIT: - if ((u64)addr + buffersize > (1ULL << 30)) - goto address_error; - break; - case B43legacy_DMA_32BIT: - if ((u64)addr + buffersize > (1ULL << 32)) - goto address_error; - break; - } - - /* The address is OK. */ - return false; - -address_error: - /* We can't support this address. Unmap it again. */ - unmap_descbuffer(ring, addr, buffersize, dma_to_device); - - return true; -} - -static int setup_rx_descbuffer(struct b43legacy_dmaring *ring, - struct b43legacy_dmadesc32 *desc, - struct b43legacy_dmadesc_meta *meta, - gfp_t gfp_flags) -{ - struct b43legacy_rxhdr_fw3 *rxhdr; - struct b43legacy_hwtxstatus *txstat; - dma_addr_t dmaaddr; - struct sk_buff *skb; - - B43legacy_WARN_ON(ring->tx); - - skb = __dev_alloc_skb(ring->rx_buffersize, gfp_flags); - if (unlikely(!skb)) - return -ENOMEM; - dmaaddr = map_descbuffer(ring, skb->data, - ring->rx_buffersize, 0); - if (b43legacy_dma_mapping_error(ring, dmaaddr, ring->rx_buffersize, 0)) { - /* ugh. try to realloc in zone_dma */ - gfp_flags |= GFP_DMA; - - dev_kfree_skb_any(skb); - - skb = __dev_alloc_skb(ring->rx_buffersize, gfp_flags); - if (unlikely(!skb)) - return -ENOMEM; - dmaaddr = map_descbuffer(ring, skb->data, - ring->rx_buffersize, 0); - } - - if (b43legacy_dma_mapping_error(ring, dmaaddr, ring->rx_buffersize, 0)) { - dev_kfree_skb_any(skb); - return -EIO; - } - - meta->skb = skb; - meta->dmaaddr = dmaaddr; - op32_fill_descriptor(ring, desc, dmaaddr, ring->rx_buffersize, 0, 0, 0); - - rxhdr = (struct b43legacy_rxhdr_fw3 *)(skb->data); - rxhdr->frame_len = 0; - txstat = (struct b43legacy_hwtxstatus *)(skb->data); - txstat->cookie = 0; - - return 0; -} - -/* Allocate the initial descbuffers. - * This is used for an RX ring only. - */ -static int alloc_initial_descbuffers(struct b43legacy_dmaring *ring) -{ - int i; - int err = -ENOMEM; - struct b43legacy_dmadesc32 *desc; - struct b43legacy_dmadesc_meta *meta; - - for (i = 0; i < ring->nr_slots; i++) { - desc = op32_idx2desc(ring, i, &meta); - - err = setup_rx_descbuffer(ring, desc, meta, GFP_KERNEL); - if (err) { - b43legacyerr(ring->dev->wl, - "Failed to allocate initial descbuffers\n"); - goto err_unwind; - } - } - mb(); /* all descbuffer setup before next line */ - ring->used_slots = ring->nr_slots; - err = 0; -out: - return err; - -err_unwind: - for (i--; i >= 0; i--) { - desc = op32_idx2desc(ring, i, &meta); - - unmap_descbuffer(ring, meta->dmaaddr, ring->rx_buffersize, 0); - dev_kfree_skb(meta->skb); - } - goto out; -} - -/* Do initial setup of the DMA controller. - * Reset the controller, write the ring busaddress - * and switch the "enable" bit on. - */ -static int dmacontroller_setup(struct b43legacy_dmaring *ring) -{ - int err = 0; - u32 value; - u32 addrext; - u32 trans = ring->dev->dma.translation; - u32 ringbase = (u32)(ring->dmabase); - - if (ring->tx) { - addrext = (ringbase & SSB_DMA_TRANSLATION_MASK) - >> SSB_DMA_TRANSLATION_SHIFT; - value = B43legacy_DMA32_TXENABLE; - value |= (addrext << B43legacy_DMA32_TXADDREXT_SHIFT) - & B43legacy_DMA32_TXADDREXT_MASK; - b43legacy_dma_write(ring, B43legacy_DMA32_TXCTL, value); - b43legacy_dma_write(ring, B43legacy_DMA32_TXRING, - (ringbase & ~SSB_DMA_TRANSLATION_MASK) - | trans); - } else { - err = alloc_initial_descbuffers(ring); - if (err) - goto out; - - addrext = (ringbase & SSB_DMA_TRANSLATION_MASK) - >> SSB_DMA_TRANSLATION_SHIFT; - value = (ring->frameoffset << - B43legacy_DMA32_RXFROFF_SHIFT); - value |= B43legacy_DMA32_RXENABLE; - value |= (addrext << B43legacy_DMA32_RXADDREXT_SHIFT) - & B43legacy_DMA32_RXADDREXT_MASK; - b43legacy_dma_write(ring, B43legacy_DMA32_RXCTL, value); - b43legacy_dma_write(ring, B43legacy_DMA32_RXRING, - (ringbase & ~SSB_DMA_TRANSLATION_MASK) - | trans); - b43legacy_dma_write(ring, B43legacy_DMA32_RXINDEX, 200); - } - -out: - return err; -} - -/* Shutdown the DMA controller. */ -static void dmacontroller_cleanup(struct b43legacy_dmaring *ring) -{ - if (ring->tx) { - b43legacy_dmacontroller_tx_reset(ring->dev, ring->mmio_base, - ring->type); - b43legacy_dma_write(ring, B43legacy_DMA32_TXRING, 0); - } else { - b43legacy_dmacontroller_rx_reset(ring->dev, ring->mmio_base, - ring->type); - b43legacy_dma_write(ring, B43legacy_DMA32_RXRING, 0); - } -} - -static void free_all_descbuffers(struct b43legacy_dmaring *ring) -{ - struct b43legacy_dmadesc_meta *meta; - int i; - - if (!ring->used_slots) - return; - for (i = 0; i < ring->nr_slots; i++) { - op32_idx2desc(ring, i, &meta); - - if (!meta->skb) { - B43legacy_WARN_ON(!ring->tx); - continue; - } - if (ring->tx) - unmap_descbuffer(ring, meta->dmaaddr, - meta->skb->len, 1); - else - unmap_descbuffer(ring, meta->dmaaddr, - ring->rx_buffersize, 0); - free_descriptor_buffer(ring, meta, 0); - } -} - -static u64 supported_dma_mask(struct b43legacy_wldev *dev) -{ - u32 tmp; - u16 mmio_base; - - mmio_base = b43legacy_dmacontroller_base(0, 0); - b43legacy_write32(dev, - mmio_base + B43legacy_DMA32_TXCTL, - B43legacy_DMA32_TXADDREXT_MASK); - tmp = b43legacy_read32(dev, mmio_base + - B43legacy_DMA32_TXCTL); - if (tmp & B43legacy_DMA32_TXADDREXT_MASK) - return DMA_BIT_MASK(32); - - return DMA_BIT_MASK(30); -} - -static enum b43legacy_dmatype dma_mask_to_engine_type(u64 dmamask) -{ - if (dmamask == DMA_BIT_MASK(30)) - return B43legacy_DMA_30BIT; - if (dmamask == DMA_BIT_MASK(32)) - return B43legacy_DMA_32BIT; - B43legacy_WARN_ON(1); - return B43legacy_DMA_30BIT; -} - -/* Main initialization function. */ -static -struct b43legacy_dmaring *b43legacy_setup_dmaring(struct b43legacy_wldev *dev, - int controller_index, - int for_tx, - enum b43legacy_dmatype type) -{ - struct b43legacy_dmaring *ring; - int err; - int nr_slots; - dma_addr_t dma_test; - - ring = kzalloc(sizeof(*ring), GFP_KERNEL); - if (!ring) - goto out; - ring->type = type; - ring->dev = dev; - - nr_slots = B43legacy_RXRING_SLOTS; - if (for_tx) - nr_slots = B43legacy_TXRING_SLOTS; - - ring->meta = kcalloc(nr_slots, sizeof(struct b43legacy_dmadesc_meta), - GFP_KERNEL); - if (!ring->meta) - goto err_kfree_ring; - if (for_tx) { - ring->txhdr_cache = kcalloc(nr_slots, - sizeof(struct b43legacy_txhdr_fw3), - GFP_KERNEL); - if (!ring->txhdr_cache) - goto err_kfree_meta; - - /* test for ability to dma to txhdr_cache */ - dma_test = dma_map_single(dev->dev->dma_dev, ring->txhdr_cache, - sizeof(struct b43legacy_txhdr_fw3), - DMA_TO_DEVICE); - - if (b43legacy_dma_mapping_error(ring, dma_test, - sizeof(struct b43legacy_txhdr_fw3), 1)) { - /* ugh realloc */ - kfree(ring->txhdr_cache); - ring->txhdr_cache = kcalloc(nr_slots, - sizeof(struct b43legacy_txhdr_fw3), - GFP_KERNEL | GFP_DMA); - if (!ring->txhdr_cache) - goto err_kfree_meta; - - dma_test = dma_map_single(dev->dev->dma_dev, - ring->txhdr_cache, - sizeof(struct b43legacy_txhdr_fw3), - DMA_TO_DEVICE); - - if (b43legacy_dma_mapping_error(ring, dma_test, - sizeof(struct b43legacy_txhdr_fw3), 1)) - goto err_kfree_txhdr_cache; - } - - dma_unmap_single(dev->dev->dma_dev, dma_test, - sizeof(struct b43legacy_txhdr_fw3), - DMA_TO_DEVICE); - } - - ring->nr_slots = nr_slots; - ring->mmio_base = b43legacy_dmacontroller_base(type, controller_index); - ring->index = controller_index; - if (for_tx) { - ring->tx = true; - ring->current_slot = -1; - } else { - if (ring->index == 0) { - ring->rx_buffersize = B43legacy_DMA0_RX_BUFFERSIZE; - ring->frameoffset = B43legacy_DMA0_RX_FRAMEOFFSET; - } else if (ring->index == 3) { - ring->rx_buffersize = B43legacy_DMA3_RX_BUFFERSIZE; - ring->frameoffset = B43legacy_DMA3_RX_FRAMEOFFSET; - } else - B43legacy_WARN_ON(1); - } -#ifdef CONFIG_B43LEGACY_DEBUG - ring->last_injected_overflow = jiffies; -#endif - - err = alloc_ringmemory(ring); - if (err) - goto err_kfree_txhdr_cache; - err = dmacontroller_setup(ring); - if (err) - goto err_free_ringmemory; - -out: - return ring; - -err_free_ringmemory: - free_ringmemory(ring); -err_kfree_txhdr_cache: - kfree(ring->txhdr_cache); -err_kfree_meta: - kfree(ring->meta); -err_kfree_ring: - kfree(ring); - ring = NULL; - goto out; -} - -/* Main cleanup function. */ -static void b43legacy_destroy_dmaring(struct b43legacy_dmaring *ring) -{ - if (!ring) - return; - - b43legacydbg(ring->dev->wl, "DMA-%u 0x%04X (%s) max used slots:" - " %d/%d\n", (unsigned int)(ring->type), ring->mmio_base, - (ring->tx) ? "TX" : "RX", ring->max_used_slots, - ring->nr_slots); - /* Device IRQs are disabled prior entering this function, - * so no need to take care of concurrency with rx handler stuff. - */ - dmacontroller_cleanup(ring); - free_all_descbuffers(ring); - free_ringmemory(ring); - - kfree(ring->txhdr_cache); - kfree(ring->meta); - kfree(ring); -} - -void b43legacy_dma_free(struct b43legacy_wldev *dev) -{ - struct b43legacy_dma *dma; - - if (b43legacy_using_pio(dev)) - return; - dma = &dev->dma; - - b43legacy_destroy_dmaring(dma->rx_ring3); - dma->rx_ring3 = NULL; - b43legacy_destroy_dmaring(dma->rx_ring0); - dma->rx_ring0 = NULL; - - b43legacy_destroy_dmaring(dma->tx_ring5); - dma->tx_ring5 = NULL; - b43legacy_destroy_dmaring(dma->tx_ring4); - dma->tx_ring4 = NULL; - b43legacy_destroy_dmaring(dma->tx_ring3); - dma->tx_ring3 = NULL; - b43legacy_destroy_dmaring(dma->tx_ring2); - dma->tx_ring2 = NULL; - b43legacy_destroy_dmaring(dma->tx_ring1); - dma->tx_ring1 = NULL; - b43legacy_destroy_dmaring(dma->tx_ring0); - dma->tx_ring0 = NULL; -} - -static int b43legacy_dma_set_mask(struct b43legacy_wldev *dev, u64 mask) -{ - u64 orig_mask = mask; - bool fallback = false; - int err; - - /* Try to set the DMA mask. If it fails, try falling back to a - * lower mask, as we can always also support a lower one. */ - while (1) { - err = dma_set_mask_and_coherent(dev->dev->dma_dev, mask); - if (!err) - break; - if (mask == DMA_BIT_MASK(64)) { - mask = DMA_BIT_MASK(32); - fallback = true; - continue; - } - if (mask == DMA_BIT_MASK(32)) { - mask = DMA_BIT_MASK(30); - fallback = true; - continue; - } - b43legacyerr(dev->wl, "The machine/kernel does not support " - "the required %u-bit DMA mask\n", - (unsigned int)dma_mask_to_engine_type(orig_mask)); - return -EOPNOTSUPP; - } - if (fallback) { - b43legacyinfo(dev->wl, "DMA mask fallback from %u-bit to %u-" - "bit\n", - (unsigned int)dma_mask_to_engine_type(orig_mask), - (unsigned int)dma_mask_to_engine_type(mask)); - } - - return 0; -} - -int b43legacy_dma_init(struct b43legacy_wldev *dev) -{ - struct b43legacy_dma *dma = &dev->dma; - struct b43legacy_dmaring *ring; - int err; - u64 dmamask; - enum b43legacy_dmatype type; - - dmamask = supported_dma_mask(dev); - type = dma_mask_to_engine_type(dmamask); - err = b43legacy_dma_set_mask(dev, dmamask); - if (err) { -#ifdef CONFIG_B43LEGACY_PIO - b43legacywarn(dev->wl, "DMA for this device not supported. " - "Falling back to PIO\n"); - dev->__using_pio = true; - return -EAGAIN; -#else - b43legacyerr(dev->wl, "DMA for this device not supported and " - "no PIO support compiled in\n"); - return -EOPNOTSUPP; -#endif - } - dma->translation = ssb_dma_translation(dev->dev); - - err = -ENOMEM; - /* setup TX DMA channels. */ - ring = b43legacy_setup_dmaring(dev, 0, 1, type); - if (!ring) - goto out; - dma->tx_ring0 = ring; - - ring = b43legacy_setup_dmaring(dev, 1, 1, type); - if (!ring) - goto err_destroy_tx0; - dma->tx_ring1 = ring; - - ring = b43legacy_setup_dmaring(dev, 2, 1, type); - if (!ring) - goto err_destroy_tx1; - dma->tx_ring2 = ring; - - ring = b43legacy_setup_dmaring(dev, 3, 1, type); - if (!ring) - goto err_destroy_tx2; - dma->tx_ring3 = ring; - - ring = b43legacy_setup_dmaring(dev, 4, 1, type); - if (!ring) - goto err_destroy_tx3; - dma->tx_ring4 = ring; - - ring = b43legacy_setup_dmaring(dev, 5, 1, type); - if (!ring) - goto err_destroy_tx4; - dma->tx_ring5 = ring; - - /* setup RX DMA channels. */ - ring = b43legacy_setup_dmaring(dev, 0, 0, type); - if (!ring) - goto err_destroy_tx5; - dma->rx_ring0 = ring; - - if (dev->dev->id.revision < 5) { - ring = b43legacy_setup_dmaring(dev, 3, 0, type); - if (!ring) - goto err_destroy_rx0; - dma->rx_ring3 = ring; - } - - b43legacydbg(dev->wl, "%u-bit DMA initialized\n", (unsigned int)type); - err = 0; -out: - return err; - -err_destroy_rx0: - b43legacy_destroy_dmaring(dma->rx_ring0); - dma->rx_ring0 = NULL; -err_destroy_tx5: - b43legacy_destroy_dmaring(dma->tx_ring5); - dma->tx_ring5 = NULL; -err_destroy_tx4: - b43legacy_destroy_dmaring(dma->tx_ring4); - dma->tx_ring4 = NULL; -err_destroy_tx3: - b43legacy_destroy_dmaring(dma->tx_ring3); - dma->tx_ring3 = NULL; -err_destroy_tx2: - b43legacy_destroy_dmaring(dma->tx_ring2); - dma->tx_ring2 = NULL; -err_destroy_tx1: - b43legacy_destroy_dmaring(dma->tx_ring1); - dma->tx_ring1 = NULL; -err_destroy_tx0: - b43legacy_destroy_dmaring(dma->tx_ring0); - dma->tx_ring0 = NULL; - goto out; -} - -/* Generate a cookie for the TX header. */ -static u16 generate_cookie(struct b43legacy_dmaring *ring, - int slot) -{ - u16 cookie = 0x1000; - - /* Use the upper 4 bits of the cookie as - * DMA controller ID and store the slot number - * in the lower 12 bits. - * Note that the cookie must never be 0, as this - * is a special value used in RX path. - */ - switch (ring->index) { - case 0: - cookie = 0xA000; - break; - case 1: - cookie = 0xB000; - break; - case 2: - cookie = 0xC000; - break; - case 3: - cookie = 0xD000; - break; - case 4: - cookie = 0xE000; - break; - case 5: - cookie = 0xF000; - break; - } - B43legacy_WARN_ON(!(((u16)slot & 0xF000) == 0x0000)); - cookie |= (u16)slot; - - return cookie; -} - -/* Inspect a cookie and find out to which controller/slot it belongs. */ -static -struct b43legacy_dmaring *parse_cookie(struct b43legacy_wldev *dev, - u16 cookie, int *slot) -{ - struct b43legacy_dma *dma = &dev->dma; - struct b43legacy_dmaring *ring = NULL; - - switch (cookie & 0xF000) { - case 0xA000: - ring = dma->tx_ring0; - break; - case 0xB000: - ring = dma->tx_ring1; - break; - case 0xC000: - ring = dma->tx_ring2; - break; - case 0xD000: - ring = dma->tx_ring3; - break; - case 0xE000: - ring = dma->tx_ring4; - break; - case 0xF000: - ring = dma->tx_ring5; - break; - default: - B43legacy_WARN_ON(1); - } - *slot = (cookie & 0x0FFF); - B43legacy_WARN_ON(!(ring && *slot >= 0 && *slot < ring->nr_slots)); - - return ring; -} - -static int dma_tx_fragment(struct b43legacy_dmaring *ring, - struct sk_buff **in_skb) -{ - struct sk_buff *skb = *in_skb; - struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); - u8 *header; - int slot, old_top_slot, old_used_slots; - int err; - struct b43legacy_dmadesc32 *desc; - struct b43legacy_dmadesc_meta *meta; - struct b43legacy_dmadesc_meta *meta_hdr; - struct sk_buff *bounce_skb; - -#define SLOTS_PER_PACKET 2 - B43legacy_WARN_ON(skb_shinfo(skb)->nr_frags != 0); - - old_top_slot = ring->current_slot; - old_used_slots = ring->used_slots; - - /* Get a slot for the header. */ - slot = request_slot(ring); - desc = op32_idx2desc(ring, slot, &meta_hdr); - memset(meta_hdr, 0, sizeof(*meta_hdr)); - - header = &(ring->txhdr_cache[slot * sizeof( - struct b43legacy_txhdr_fw3)]); - err = b43legacy_generate_txhdr(ring->dev, header, - skb->data, skb->len, info, - generate_cookie(ring, slot)); - if (unlikely(err)) { - ring->current_slot = old_top_slot; - ring->used_slots = old_used_slots; - return err; - } - - meta_hdr->dmaaddr = map_descbuffer(ring, (unsigned char *)header, - sizeof(struct b43legacy_txhdr_fw3), 1); - if (b43legacy_dma_mapping_error(ring, meta_hdr->dmaaddr, - sizeof(struct b43legacy_txhdr_fw3), 1)) { - ring->current_slot = old_top_slot; - ring->used_slots = old_used_slots; - return -EIO; - } - op32_fill_descriptor(ring, desc, meta_hdr->dmaaddr, - sizeof(struct b43legacy_txhdr_fw3), 1, 0, 0); - - /* Get a slot for the payload. */ - slot = request_slot(ring); - desc = op32_idx2desc(ring, slot, &meta); - memset(meta, 0, sizeof(*meta)); - - meta->skb = skb; - meta->is_last_fragment = true; - - meta->dmaaddr = map_descbuffer(ring, skb->data, skb->len, 1); - /* create a bounce buffer in zone_dma on mapping failure. */ - if (b43legacy_dma_mapping_error(ring, meta->dmaaddr, skb->len, 1)) { - bounce_skb = alloc_skb(skb->len, GFP_ATOMIC | GFP_DMA); - if (!bounce_skb) { - ring->current_slot = old_top_slot; - ring->used_slots = old_used_slots; - err = -ENOMEM; - goto out_unmap_hdr; - } - - memcpy(skb_put(bounce_skb, skb->len), skb->data, skb->len); - memcpy(bounce_skb->cb, skb->cb, sizeof(skb->cb)); - bounce_skb->dev = skb->dev; - skb_set_queue_mapping(bounce_skb, skb_get_queue_mapping(skb)); - info = IEEE80211_SKB_CB(bounce_skb); - - dev_kfree_skb_any(skb); - skb = bounce_skb; - *in_skb = bounce_skb; - meta->skb = skb; - meta->dmaaddr = map_descbuffer(ring, skb->data, skb->len, 1); - if (b43legacy_dma_mapping_error(ring, meta->dmaaddr, skb->len, 1)) { - ring->current_slot = old_top_slot; - ring->used_slots = old_used_slots; - err = -EIO; - goto out_free_bounce; - } - } - - op32_fill_descriptor(ring, desc, meta->dmaaddr, - skb->len, 0, 1, 1); - - wmb(); /* previous stuff MUST be done */ - /* Now transfer the whole frame. */ - op32_poke_tx(ring, next_slot(ring, slot)); - return 0; - -out_free_bounce: - dev_kfree_skb_any(skb); -out_unmap_hdr: - unmap_descbuffer(ring, meta_hdr->dmaaddr, - sizeof(struct b43legacy_txhdr_fw3), 1); - return err; -} - -static inline -int should_inject_overflow(struct b43legacy_dmaring *ring) -{ -#ifdef CONFIG_B43LEGACY_DEBUG - if (unlikely(b43legacy_debug(ring->dev, - B43legacy_DBG_DMAOVERFLOW))) { - /* Check if we should inject another ringbuffer overflow - * to test handling of this situation in the stack. */ - unsigned long next_overflow; - - next_overflow = ring->last_injected_overflow + HZ; - if (time_after(jiffies, next_overflow)) { - ring->last_injected_overflow = jiffies; - b43legacydbg(ring->dev->wl, - "Injecting TX ring overflow on " - "DMA controller %d\n", ring->index); - return 1; - } - } -#endif /* CONFIG_B43LEGACY_DEBUG */ - return 0; -} - -int b43legacy_dma_tx(struct b43legacy_wldev *dev, - struct sk_buff *skb) -{ - struct b43legacy_dmaring *ring; - int err = 0; - - ring = priority_to_txring(dev, skb_get_queue_mapping(skb)); - B43legacy_WARN_ON(!ring->tx); - - if (unlikely(ring->stopped)) { - /* We get here only because of a bug in mac80211. - * Because of a race, one packet may be queued after - * the queue is stopped, thus we got called when we shouldn't. - * For now, just refuse the transmit. */ - if (b43legacy_debug(dev, B43legacy_DBG_DMAVERBOSE)) - b43legacyerr(dev->wl, "Packet after queue stopped\n"); - return -ENOSPC; - } - - if (unlikely(WARN_ON(free_slots(ring) < SLOTS_PER_PACKET))) { - /* If we get here, we have a real error with the queue - * full, but queues not stopped. */ - b43legacyerr(dev->wl, "DMA queue overflow\n"); - return -ENOSPC; - } - - /* dma_tx_fragment might reallocate the skb, so invalidate pointers pointing - * into the skb data or cb now. */ - err = dma_tx_fragment(ring, &skb); - if (unlikely(err == -ENOKEY)) { - /* Drop this packet, as we don't have the encryption key - * anymore and must not transmit it unencrypted. */ - dev_kfree_skb_any(skb); - return 0; - } - if (unlikely(err)) { - b43legacyerr(dev->wl, "DMA tx mapping failure\n"); - return err; - } - if ((free_slots(ring) < SLOTS_PER_PACKET) || - should_inject_overflow(ring)) { - /* This TX ring is full. */ - unsigned int skb_mapping = skb_get_queue_mapping(skb); - ieee80211_stop_queue(dev->wl->hw, skb_mapping); - dev->wl->tx_queue_stopped[skb_mapping] = 1; - ring->stopped = true; - if (b43legacy_debug(dev, B43legacy_DBG_DMAVERBOSE)) - b43legacydbg(dev->wl, "Stopped TX ring %d\n", - ring->index); - } - return err; -} - -void b43legacy_dma_handle_txstatus(struct b43legacy_wldev *dev, - const struct b43legacy_txstatus *status) -{ - struct b43legacy_dmaring *ring; - struct b43legacy_dmadesc_meta *meta; - int retry_limit; - int slot; - int firstused; - - ring = parse_cookie(dev, status->cookie, &slot); - if (unlikely(!ring)) - return; - B43legacy_WARN_ON(!ring->tx); - - /* Sanity check: TX packets are processed in-order on one ring. - * Check if the slot deduced from the cookie really is the first - * used slot. */ - firstused = ring->current_slot - ring->used_slots + 1; - if (firstused < 0) - firstused = ring->nr_slots + firstused; - if (unlikely(slot != firstused)) { - /* This possibly is a firmware bug and will result in - * malfunction, memory leaks and/or stall of DMA functionality. - */ - b43legacydbg(dev->wl, "Out of order TX status report on DMA " - "ring %d. Expected %d, but got %d\n", - ring->index, firstused, slot); - return; - } - - while (1) { - B43legacy_WARN_ON(!(slot >= 0 && slot < ring->nr_slots)); - op32_idx2desc(ring, slot, &meta); - - if (meta->skb) - unmap_descbuffer(ring, meta->dmaaddr, - meta->skb->len, 1); - else - unmap_descbuffer(ring, meta->dmaaddr, - sizeof(struct b43legacy_txhdr_fw3), - 1); - - if (meta->is_last_fragment) { - struct ieee80211_tx_info *info; - BUG_ON(!meta->skb); - info = IEEE80211_SKB_CB(meta->skb); - - /* preserve the confiured retry limit before clearing the status - * The xmit function has overwritten the rc's value with the actual - * retry limit done by the hardware */ - retry_limit = info->status.rates[0].count; - ieee80211_tx_info_clear_status(info); - - if (status->acked) - info->flags |= IEEE80211_TX_STAT_ACK; - - if (status->rts_count > dev->wl->hw->conf.short_frame_max_tx_count) { - /* - * If the short retries (RTS, not data frame) have exceeded - * the limit, the hw will not have tried the selected rate, - * but will have used the fallback rate instead. - * Don't let the rate control count attempts for the selected - * rate in this case, otherwise the statistics will be off. - */ - info->status.rates[0].count = 0; - info->status.rates[1].count = status->frame_count; - } else { - if (status->frame_count > retry_limit) { - info->status.rates[0].count = retry_limit; - info->status.rates[1].count = status->frame_count - - retry_limit; - - } else { - info->status.rates[0].count = status->frame_count; - info->status.rates[1].idx = -1; - } - } - - /* Call back to inform the ieee80211 subsystem about the - * status of the transmission. - * Some fields of txstat are already filled in dma_tx(). - */ - ieee80211_tx_status_irqsafe(dev->wl->hw, meta->skb); - /* skb is freed by ieee80211_tx_status_irqsafe() */ - meta->skb = NULL; - } else { - /* No need to call free_descriptor_buffer here, as - * this is only the txhdr, which is not allocated. - */ - B43legacy_WARN_ON(meta->skb != NULL); - } - - /* Everything unmapped and free'd. So it's not used anymore. */ - ring->used_slots--; - - if (meta->is_last_fragment) - break; - slot = next_slot(ring, slot); - } - dev->stats.last_tx = jiffies; - if (ring->stopped) { - B43legacy_WARN_ON(free_slots(ring) < SLOTS_PER_PACKET); - ring->stopped = false; - } - - if (dev->wl->tx_queue_stopped[ring->queue_prio]) { - dev->wl->tx_queue_stopped[ring->queue_prio] = 0; - } else { - /* If the driver queue is running wake the corresponding - * mac80211 queue. */ - ieee80211_wake_queue(dev->wl->hw, ring->queue_prio); - if (b43legacy_debug(dev, B43legacy_DBG_DMAVERBOSE)) - b43legacydbg(dev->wl, "Woke up TX ring %d\n", - ring->index); - } - /* Add work to the queue. */ - ieee80211_queue_work(dev->wl->hw, &dev->wl->tx_work); -} - -static void dma_rx(struct b43legacy_dmaring *ring, - int *slot) -{ - struct b43legacy_dmadesc32 *desc; - struct b43legacy_dmadesc_meta *meta; - struct b43legacy_rxhdr_fw3 *rxhdr; - struct sk_buff *skb; - u16 len; - int err; - dma_addr_t dmaaddr; - - desc = op32_idx2desc(ring, *slot, &meta); - - sync_descbuffer_for_cpu(ring, meta->dmaaddr, ring->rx_buffersize); - skb = meta->skb; - - if (ring->index == 3) { - /* We received an xmit status. */ - struct b43legacy_hwtxstatus *hw = - (struct b43legacy_hwtxstatus *)skb->data; - int i = 0; - - while (hw->cookie == 0) { - if (i > 100) - break; - i++; - udelay(2); - barrier(); - } - b43legacy_handle_hwtxstatus(ring->dev, hw); - /* recycle the descriptor buffer. */ - sync_descbuffer_for_device(ring, meta->dmaaddr, - ring->rx_buffersize); - - return; - } - rxhdr = (struct b43legacy_rxhdr_fw3 *)skb->data; - len = le16_to_cpu(rxhdr->frame_len); - if (len == 0) { - int i = 0; - - do { - udelay(2); - barrier(); - len = le16_to_cpu(rxhdr->frame_len); - } while (len == 0 && i++ < 5); - if (unlikely(len == 0)) { - /* recycle the descriptor buffer. */ - sync_descbuffer_for_device(ring, meta->dmaaddr, - ring->rx_buffersize); - goto drop; - } - } - if (unlikely(len > ring->rx_buffersize)) { - /* The data did not fit into one descriptor buffer - * and is split over multiple buffers. - * This should never happen, as we try to allocate buffers - * big enough. So simply ignore this packet. - */ - int cnt = 0; - s32 tmp = len; - - while (1) { - desc = op32_idx2desc(ring, *slot, &meta); - /* recycle the descriptor buffer. */ - sync_descbuffer_for_device(ring, meta->dmaaddr, - ring->rx_buffersize); - *slot = next_slot(ring, *slot); - cnt++; - tmp -= ring->rx_buffersize; - if (tmp <= 0) - break; - } - b43legacyerr(ring->dev->wl, "DMA RX buffer too small " - "(len: %u, buffer: %u, nr-dropped: %d)\n", - len, ring->rx_buffersize, cnt); - goto drop; - } - - dmaaddr = meta->dmaaddr; - err = setup_rx_descbuffer(ring, desc, meta, GFP_ATOMIC); - if (unlikely(err)) { - b43legacydbg(ring->dev->wl, "DMA RX: setup_rx_descbuffer()" - " failed\n"); - sync_descbuffer_for_device(ring, dmaaddr, - ring->rx_buffersize); - goto drop; - } - - unmap_descbuffer(ring, dmaaddr, ring->rx_buffersize, 0); - skb_put(skb, len + ring->frameoffset); - skb_pull(skb, ring->frameoffset); - - b43legacy_rx(ring->dev, skb, rxhdr); -drop: - return; -} - -void b43legacy_dma_rx(struct b43legacy_dmaring *ring) -{ - int slot; - int current_slot; - int used_slots = 0; - - B43legacy_WARN_ON(ring->tx); - current_slot = op32_get_current_rxslot(ring); - B43legacy_WARN_ON(!(current_slot >= 0 && current_slot < - ring->nr_slots)); - - slot = ring->current_slot; - for (; slot != current_slot; slot = next_slot(ring, slot)) { - dma_rx(ring, &slot); - update_max_used_slots(ring, ++used_slots); - } - op32_set_current_rxslot(ring, slot); - ring->current_slot = slot; -} - -static void b43legacy_dma_tx_suspend_ring(struct b43legacy_dmaring *ring) -{ - B43legacy_WARN_ON(!ring->tx); - op32_tx_suspend(ring); -} - -static void b43legacy_dma_tx_resume_ring(struct b43legacy_dmaring *ring) -{ - B43legacy_WARN_ON(!ring->tx); - op32_tx_resume(ring); -} - -void b43legacy_dma_tx_suspend(struct b43legacy_wldev *dev) -{ - b43legacy_power_saving_ctl_bits(dev, -1, 1); - b43legacy_dma_tx_suspend_ring(dev->dma.tx_ring0); - b43legacy_dma_tx_suspend_ring(dev->dma.tx_ring1); - b43legacy_dma_tx_suspend_ring(dev->dma.tx_ring2); - b43legacy_dma_tx_suspend_ring(dev->dma.tx_ring3); - b43legacy_dma_tx_suspend_ring(dev->dma.tx_ring4); - b43legacy_dma_tx_suspend_ring(dev->dma.tx_ring5); -} - -void b43legacy_dma_tx_resume(struct b43legacy_wldev *dev) -{ - b43legacy_dma_tx_resume_ring(dev->dma.tx_ring5); - b43legacy_dma_tx_resume_ring(dev->dma.tx_ring4); - b43legacy_dma_tx_resume_ring(dev->dma.tx_ring3); - b43legacy_dma_tx_resume_ring(dev->dma.tx_ring2); - b43legacy_dma_tx_resume_ring(dev->dma.tx_ring1); - b43legacy_dma_tx_resume_ring(dev->dma.tx_ring0); - b43legacy_power_saving_ctl_bits(dev, -1, -1); -} |