// SPDX-License-Identifier: GPL-2.0-or-later /* Broadcom B43 wireless driver DMA ringbuffer and descriptor allocation/management Copyright (c) 2005, 2006 Michael Buesch <[email protected]> Some code in this file is derived from the b44.c driver Copyright (C) 2002 David S. Miller Copyright (C) Pekka Pietikainen */ #include "b43.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/etherdevice.h> #include <linux/slab.h> #include <asm/div64.h> /* Required number of TX DMA slots per TX frame. * This currently is 2, because we put the header and the ieee80211 frame * into separate slots. */ #define TX_SLOTS_PER_FRAME … static u32 b43_dma_address(struct b43_dma *dma, dma_addr_t dmaaddr, enum b43_addrtype addrtype) { … } /* 32bit DMA ops. */ static struct b43_dmadesc_generic *op32_idx2desc(struct b43_dmaring *ring, int slot, struct b43_dmadesc_meta **meta) { … } static void op32_fill_descriptor(struct b43_dmaring *ring, struct b43_dmadesc_generic *desc, dma_addr_t dmaaddr, u16 bufsize, int start, int end, int irq) { … } static void op32_poke_tx(struct b43_dmaring *ring, int slot) { … } static void op32_tx_suspend(struct b43_dmaring *ring) { … } static void op32_tx_resume(struct b43_dmaring *ring) { … } static int op32_get_current_rxslot(struct b43_dmaring *ring) { … } static void op32_set_current_rxslot(struct b43_dmaring *ring, int slot) { … } static const struct b43_dma_ops dma32_ops = …; /* 64bit DMA ops. */ static struct b43_dmadesc_generic *op64_idx2desc(struct b43_dmaring *ring, int slot, struct b43_dmadesc_meta **meta) { … } static void op64_fill_descriptor(struct b43_dmaring *ring, struct b43_dmadesc_generic *desc, dma_addr_t dmaaddr, u16 bufsize, int start, int end, int irq) { … } static void op64_poke_tx(struct b43_dmaring *ring, int slot) { … } static void op64_tx_suspend(struct b43_dmaring *ring) { … } static void op64_tx_resume(struct b43_dmaring *ring) { … } static int op64_get_current_rxslot(struct b43_dmaring *ring) { … } static void op64_set_current_rxslot(struct b43_dmaring *ring, int slot) { … } static const struct b43_dma_ops dma64_ops = …; static inline int free_slots(struct b43_dmaring *ring) { … } static inline int next_slot(struct b43_dmaring *ring, int slot) { … } static inline int prev_slot(struct b43_dmaring *ring, int slot) { … } #ifdef CONFIG_B43_DEBUG static void update_max_used_slots(struct b43_dmaring *ring, int current_used_slots) { … } #else static inline void update_max_used_slots(struct b43_dmaring *ring, int current_used_slots) { } #endif /* DEBUG */ /* Request a slot for usage. */ static inline int request_slot(struct b43_dmaring *ring) { … } static u16 b43_dmacontroller_base(enum b43_dmatype type, int controller_idx) { … } static inline dma_addr_t map_descbuffer(struct b43_dmaring *ring, unsigned char *buf, size_t len, int tx) { … } static inline void unmap_descbuffer(struct b43_dmaring *ring, dma_addr_t addr, size_t len, int tx) { … } static inline void sync_descbuffer_for_cpu(struct b43_dmaring *ring, dma_addr_t addr, size_t len) { … } static inline void sync_descbuffer_for_device(struct b43_dmaring *ring, dma_addr_t addr, size_t len) { … } static inline void free_descriptor_buffer(struct b43_dmaring *ring, struct b43_dmadesc_meta *meta) { … } static int alloc_ringmemory(struct b43_dmaring *ring) { … } static void free_ringmemory(struct b43_dmaring *ring) { … } /* Reset the RX DMA channel */ static int b43_dmacontroller_rx_reset(struct b43_wldev *dev, u16 mmio_base, enum b43_dmatype type) { … } /* Reset the TX DMA channel */ static int b43_dmacontroller_tx_reset(struct b43_wldev *dev, u16 mmio_base, enum b43_dmatype type) { … } /* Check if a DMA mapping address is invalid. */ static bool b43_dma_mapping_error(struct b43_dmaring *ring, dma_addr_t addr, size_t buffersize, bool dma_to_device) { … } static bool b43_rx_buffer_is_poisoned(struct b43_dmaring *ring, struct sk_buff *skb) { … } static void b43_poison_rx_buffer(struct b43_dmaring *ring, struct sk_buff *skb) { … } static int setup_rx_descbuffer(struct b43_dmaring *ring, struct b43_dmadesc_generic *desc, struct b43_dmadesc_meta *meta, gfp_t gfp_flags) { … } /* Allocate the initial descbuffers. * This is used for an RX ring only. */ static int alloc_initial_descbuffers(struct b43_dmaring *ring) { … } /* 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 b43_dmaring *ring) { … } /* Shutdown the DMA controller. */ static void dmacontroller_cleanup(struct b43_dmaring *ring) { … } static void free_all_descbuffers(struct b43_dmaring *ring) { … } static enum b43_dmatype b43_engine_type(struct b43_wldev *dev) { … } /* Main initialization function. */ static struct b43_dmaring *b43_setup_dmaring(struct b43_wldev *dev, int controller_index, int for_tx, enum b43_dmatype type) { … } #define divide(a, b) … #define modulo(a, b) … /* Main cleanup function. */ static void b43_destroy_dmaring(struct b43_dmaring *ring, const char *ringname) { … } #define destroy_ring(dma, ring) … void b43_dma_free(struct b43_wldev *dev) { … } /* Some hardware with 64-bit DMA seems to be bugged and looks for translation * bit in low address word instead of high one. */ static bool b43_dma_translation_in_low_word(struct b43_wldev *dev, enum b43_dmatype type) { … } int b43_dma_init(struct b43_wldev *dev) { … } /* Generate a cookie for the TX header. */ static u16 generate_cookie(struct b43_dmaring *ring, int slot) { … } /* Inspect a cookie and find out to which controller/slot it belongs. */ static struct b43_dmaring *parse_cookie(struct b43_wldev *dev, u16 cookie, int *slot) { … } static int dma_tx_fragment(struct b43_dmaring *ring, struct sk_buff *skb) { … } static inline int should_inject_overflow(struct b43_dmaring *ring) { … } /* Static mapping of mac80211's queues (priorities) to b43 DMA rings. */ static struct b43_dmaring *select_ring_by_priority(struct b43_wldev *dev, u8 queue_prio) { … } int b43_dma_tx(struct b43_wldev *dev, struct sk_buff *skb) { … } void b43_dma_handle_txstatus(struct b43_wldev *dev, const struct b43_txstatus *status) { … } static void dma_rx(struct b43_dmaring *ring, int *slot) { … } void b43_dma_handle_rx_overflow(struct b43_dmaring *ring) { … } void b43_dma_rx(struct b43_dmaring *ring) { … } static void b43_dma_tx_suspend_ring(struct b43_dmaring *ring) { … } static void b43_dma_tx_resume_ring(struct b43_dmaring *ring) { … } void b43_dma_tx_suspend(struct b43_wldev *dev) { … } void b43_dma_tx_resume(struct b43_wldev *dev) { … } static void direct_fifo_rx(struct b43_wldev *dev, enum b43_dmatype type, u16 mmio_base, bool enable) { … } /* Enable/Disable Direct FIFO Receive Mode (PIO) on a RX engine. * This is called from PIO code, so DMA structures are not available. */ void b43_dma_direct_fifo_rx(struct b43_wldev *dev, unsigned int engine_index, bool enable) { … }
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