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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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#define DESC_TYPE 27#define DESC_TYPE_HOST 0x10#define DESC_TYPE_TEARD 0x13
#define TD_DESC_IS_RX (1 << 16)#define TD_DESC_DMA_NUM 10
#define DESC_LENGTH_BITS_NUM 21
#define DESC_TYPE_USB (5 << 26)#define DESC_PD_COMPLETE (1 << 31)
/* DMA engine */#define DMA_TDFDQ 4#define DMA_TXGCR(x) (0x800 + (x) * 0x20)#define DMA_RXGCR(x) (0x808 + (x) * 0x20)#define RXHPCRA0 4
#define GCR_CHAN_ENABLE (1 << 31)#define GCR_TEARDOWN (1 << 30)#define GCR_STARV_RETRY (1 << 24)#define GCR_DESC_TYPE_HOST (1 << 14)
/* DMA scheduler */#define DMA_SCHED_CTRL 0#define DMA_SCHED_CTRL_EN (1 << 31)#define DMA_SCHED_WORD(x) ((x) * 4 + 0x800)
#define SCHED_ENTRY0_CHAN(x) ((x) << 0)#define SCHED_ENTRY0_IS_RX (1 << 7)
#define SCHED_ENTRY1_CHAN(x) ((x) << 8)#define SCHED_ENTRY1_IS_RX (1 << 15)
#define SCHED_ENTRY2_CHAN(x) ((x) << 16)#define SCHED_ENTRY2_IS_RX (1 << 23)
#define SCHED_ENTRY3_CHAN(x) ((x) << 24)#define SCHED_ENTRY3_IS_RX (1 << 31)
/* Queue manager *//* 4 KiB of memory for descriptors, 2 for each endpoint */#define ALLOC_DECS_NUM 128#define DESCS_AREAS 1#define TOTAL_DESCS_NUM (ALLOC_DECS_NUM * DESCS_AREAS)#define QMGR_SCRATCH_SIZE (TOTAL_DESCS_NUM * 4)
#define QMGR_LRAM0_BASE 0x80#define QMGR_LRAM_SIZE 0x84#define QMGR_LRAM1_BASE 0x88#define QMGR_MEMBASE(x) (0x1000 + (x) * 0x10)#define QMGR_MEMCTRL(x) (0x1004 + (x) * 0x10)#define QMGR_MEMCTRL_IDX_SH 16#define QMGR_MEMCTRL_DESC_SH 8
#define QMGR_PEND(x) (0x90 + (x) * 4)
#define QMGR_PENDING_SLOT_Q(x) (x / 32)#define QMGR_PENDING_BIT_Q(x) (x % 32)
#define QMGR_QUEUE_A(n) (0x2000 + (n) * 0x10)#define QMGR_QUEUE_B(n) (0x2004 + (n) * 0x10)#define QMGR_QUEUE_C(n) (0x2008 + (n) * 0x10)#define QMGR_QUEUE_D(n) (0x200c + (n) * 0x10)
/* Packet Descriptor */#define PD2_ZERO_LENGTH (1 << 19)
struct cppi41_channel { struct dma_chan chan; struct dma_async_tx_descriptor txd; struct cppi41_dd *cdd; struct cppi41_desc *desc; dma_addr_t desc_phys; void __iomem *gcr_reg; int is_tx; u32 residue;
unsigned int q_num; unsigned int q_comp_num; unsigned int port_num;
unsigned td_retry; unsigned td_queued:1; unsigned td_seen:1; unsigned td_desc_seen:1;
struct list_head node; /* Node for pending list */};
struct cppi41_desc { u32 pd0; u32 pd1; u32 pd2; u32 pd3; u32 pd4; u32 pd5; u32 pd6; u32 pd7;} __aligned(32);
struct chan_queues { u16 submit; u16 complete;};
struct cppi41_dd { struct dma_device ddev;
void *qmgr_scratch; dma_addr_t scratch_phys;
struct cppi41_desc *cd; dma_addr_t descs_phys; u32 first_td_desc; struct cppi41_channel *chan_busy[ALLOC_DECS_NUM];
void __iomem *ctrl_mem; void __iomem *sched_mem; void __iomem *qmgr_mem; unsigned int irq; const struct chan_queues *queues_rx; const struct chan_queues *queues_tx; struct chan_queues td_queue; u16 first_completion_queue; u16 qmgr_num_pend; u32 n_chans; u8 platform;
struct list_head pending; /* Pending queued transfers */ spinlock_t lock; /* Lock for pending list */
/* context for suspend/resume */ unsigned int dma_tdfdq;
bool is_suspended;};
static struct chan_queues am335x_usb_queues_tx[] = { /* USB0 ENDP 1 */ [ 0] = { .submit = 32, .complete = 93}, [ 1] = { .submit = 34, .complete = 94}, [ 2] = { .submit = 36, .complete = 95}, [ 3] = { .submit = 38, .complete = 96}, [ 4] = { .submit = 40, .complete = 97}, [ 5] = { .submit = 42, .complete = 98}, [ 6] = { .submit = 44, .complete = 99}, [ 7] = { .submit = 46, .complete = 100}, [ 8] = { .submit = 48, .complete = 101}, [ 9] = { .submit = 50, .complete = 102}, [10] = { .submit = 52, .complete = 103}, [11] = { .submit = 54, .complete = 104}, [12] = { .submit = 56, .complete = 105}, [13] = { .submit = 58, .complete = 106}, [14] = { .submit = 60, .complete = 107},
/* USB1 ENDP1 */ [15] = { .submit = 62, .complete = 125}, [16] = { .submit = 64, .complete = 126}, [17] = { .submit = 66, .complete = 127}, [18] = { .submit = 68, .complete = 128}, [19] = { .submit = 70, .complete = 129}, [20] = { .submit = 72, .complete = 130}, [21] = { .submit = 74, .complete = 131}, [22] = { .submit = 76, .complete = 132}, [23] = { .submit = 78, .complete = 133}, [24] = { .submit = 80, .complete = 134}, [25] = { .submit = 82, .complete = 135}, [26] = { .submit = 84, .complete = 136}, [27] = { .submit = 86, .complete = 137}, [28] = { .submit = 88, .complete = 138}, [29] = { .submit = 90, .complete = 139},};
static const struct chan_queues am335x_usb_queues_rx[] = { /* USB0 ENDP 1 */ [ 0] = { .submit = 1, .complete = 109}, [ 1] = { .submit = 2, .complete = 110}, [ 2] = { .submit = 3, .complete = 111}, [ 3] = { .submit = 4, .complete = 112}, [ 4] = { .submit = 5, .complete = 113}, [ 5] = { .submit = 6, .complete = 114}, [ 6] = { .submit = 7, .complete = 115}, [ 7] = { .submit = 8, .complete = 116}, [ 8] = { .submit = 9, .complete = 117}, [ 9] = { .submit = 10, .complete = 118}, [10] = { .submit = 11, .complete = 119}, [11] = { .submit = 12, .complete = 120}, [12] = { .submit = 13, .complete = 121}, [13] = { .submit = 14, .complete = 122}, [14] = { .submit = 15, .complete = 123},
/* USB1 ENDP 1 */ [15] = { .submit = 16, .complete = 141}, [16] = { .submit = 17, .complete = 142}, [17] = { .submit = 18, .complete = 143}, [18] = { .submit = 19, .complete = 144}, [19] = { .submit = 20, .complete = 145}, [20] = { .submit = 21, .complete = 146}, [21] = { .submit = 22, .complete = 147}, [22] = { .submit = 23, .complete = 148}, [23] = { .submit = 24, .complete = 149}, [24] = { .submit = 25, .complete = 150}, [25] = { .submit = 26, .complete = 151}, [26] = { .submit = 27, .complete = 152}, [27] = { .submit = 28, .complete = 153}, [28] = { .submit = 29, .complete = 154}, [29] = { .submit = 30, .complete = 155},};
static const struct chan_queues da8xx_usb_queues_tx[] = { [0] = { .submit = 16, .complete = 24}, [1] = { .submit = 18, .complete = 24}, [2] = { .submit = 20, .complete = 24}, [3] = { .submit = 22, .complete = 24},};
static const struct chan_queues da8xx_usb_queues_rx[] = { [0] = { .submit = 1, .complete = 26}, [1] = { .submit = 3, .complete = 26}, [2] = { .submit = 5, .complete = 26}, [3] = { .submit = 7, .complete = 26},};
struct cppi_glue_infos { const struct chan_queues *queues_rx; const struct chan_queues *queues_tx; struct chan_queues td_queue; u16 first_completion_queue; u16 qmgr_num_pend;};
static struct cppi41_channel *to_cpp41_chan(struct dma_chan *c){ return container_of(c, struct cppi41_channel, chan);}
static struct cppi41_channel *desc_to_chan(struct cppi41_dd *cdd, u32 desc){ struct cppi41_channel *c; u32 descs_size; u32 desc_num;
descs_size = sizeof(struct cppi41_desc) * ALLOC_DECS_NUM;
if (!((desc >= cdd->descs_phys) && (desc < (cdd->descs_phys + descs_size)))) { return NULL; }
desc_num = (desc - cdd->descs_phys) / sizeof(struct cppi41_desc); BUG_ON(desc_num >= ALLOC_DECS_NUM); c = cdd->chan_busy[desc_num]; cdd->chan_busy[desc_num] = NULL;
/* Usecount for chan_busy[], paired with push_desc_queue() */ pm_runtime_put(cdd->ddev.dev);
return c;}
static void cppi_writel(u32 val, void *__iomem *mem){ __raw_writel(val, mem);}
static u32 cppi_readl(void *__iomem *mem){ return __raw_readl(mem);}
static u32 pd_trans_len(u32 val){ return val & ((1 << (DESC_LENGTH_BITS_NUM + 1)) - 1);}
static u32 cppi41_pop_desc(struct cppi41_dd *cdd, unsigned queue_num){ u32 desc;
desc = cppi_readl(cdd->qmgr_mem + QMGR_QUEUE_D(queue_num)); desc &= ~0x1f; return desc;}
static irqreturn_t cppi41_irq(int irq, void *data){ struct cppi41_dd *cdd = data; u16 first_completion_queue = cdd->first_completion_queue; u16 qmgr_num_pend = cdd->qmgr_num_pend; struct cppi41_channel *c; int i;
for (i = QMGR_PENDING_SLOT_Q(first_completion_queue); i < qmgr_num_pend; i++) { u32 val; u32 q_num;
val = cppi_readl(cdd->qmgr_mem + QMGR_PEND(i)); if (i == QMGR_PENDING_SLOT_Q(first_completion_queue) && val) { u32 mask; /* set corresponding bit for completion Q 93 */ mask = 1 << QMGR_PENDING_BIT_Q(first_completion_queue); /* not set all bits for queues less than Q 93 */ mask--; /* now invert and keep only Q 93+ set */ val &= ~mask; }
if (val) __iormb();
while (val) { u32 desc, len;
/* * This should never trigger, see the comments in * push_desc_queue() */ WARN_ON(cdd->is_suspended);
q_num = __fls(val); val &= ~(1 << q_num); q_num += 32 * i; desc = cppi41_pop_desc(cdd, q_num); c = desc_to_chan(cdd, desc); if (WARN_ON(!c)) { pr_err("%s() q %d desc %08x\n", __func__, q_num, desc); continue; }
if (c->desc->pd2 & PD2_ZERO_LENGTH) len = 0; else len = pd_trans_len(c->desc->pd0);
c->residue = pd_trans_len(c->desc->pd6) - len; dma_cookie_complete(&c->txd); dmaengine_desc_get_callback_invoke(&c->txd, NULL); } } return IRQ_HANDLED;}
static dma_cookie_t cppi41_tx_submit(struct dma_async_tx_descriptor *tx){ dma_cookie_t cookie;
cookie = dma_cookie_assign(tx);
return cookie;}
static int cppi41_dma_alloc_chan_resources(struct dma_chan *chan){ struct cppi41_channel *c = to_cpp41_chan(chan); struct cppi41_dd *cdd = c->cdd; int error;
error = pm_runtime_get_sync(cdd->ddev.dev); if (error < 0) { dev_err(cdd->ddev.dev, "%s pm runtime get: %i\n", __func__, error); pm_runtime_put_noidle(cdd->ddev.dev);
return error; }
dma_cookie_init(chan); dma_async_tx_descriptor_init(&c->txd, chan); c->txd.tx_submit = cppi41_tx_submit;
if (!c->is_tx) cppi_writel(c->q_num, c->gcr_reg + RXHPCRA0);
pm_runtime_put_autosuspend(cdd->ddev.dev);
return 0;}
static void cppi41_dma_free_chan_resources(struct dma_chan *chan){ struct cppi41_channel *c = to_cpp41_chan(chan); struct cppi41_dd *cdd = c->cdd; int error;
error = pm_runtime_get_sync(cdd->ddev.dev); if (error < 0) { pm_runtime_put_noidle(cdd->ddev.dev);
return; }
WARN_ON(!list_empty(&cdd->pending));
pm_runtime_put_autosuspend(cdd->ddev.dev);}
static enum dma_status cppi41_dma_tx_status(struct dma_chan *chan, dma_cookie_t cookie, struct dma_tx_state *txstate){ struct cppi41_channel *c = to_cpp41_chan(chan); enum dma_status ret;
ret = dma_cookie_status(chan, cookie, txstate);
dma_set_residue(txstate, c->residue);
return ret;}
static void push_desc_queue(struct cppi41_channel *c){ struct cppi41_dd *cdd = c->cdd; u32 desc_num; u32 desc_phys; u32 reg;
c->residue = 0;
reg = GCR_CHAN_ENABLE; if (!c->is_tx) { reg |= GCR_STARV_RETRY; reg |= GCR_DESC_TYPE_HOST; reg |= c->q_comp_num; }
cppi_writel(reg, c->gcr_reg);
/* * We don't use writel() but __raw_writel() so we have to make sure * that the DMA descriptor in coherent memory made to the main memory * before starting the dma engine. */ __iowmb();
/* * DMA transfers can take at least 200ms to complete with USB mass * storage connected. To prevent autosuspend timeouts, we must use * pm_runtime_get/put() when chan_busy[] is modified. This will get * cleared in desc_to_chan() or cppi41_stop_chan() depending on the * outcome of the transfer. */ pm_runtime_get(cdd->ddev.dev);
desc_phys = lower_32_bits(c->desc_phys); desc_num = (desc_phys - cdd->descs_phys) / sizeof(struct cppi41_desc); WARN_ON(cdd->chan_busy[desc_num]); cdd->chan_busy[desc_num] = c;
reg = (sizeof(struct cppi41_desc) - 24) / 4; reg |= desc_phys; cppi_writel(reg, cdd->qmgr_mem + QMGR_QUEUE_D(c->q_num));}
/* * Caller must hold cdd->lock to prevent push_desc_queue() * getting called out of order. We have both cppi41_dma_issue_pending() * and cppi41_runtime_resume() call this function. */static void cppi41_run_queue(struct cppi41_dd *cdd){ struct cppi41_channel *c, *_c;
list_for_each_entry_safe(c, _c, &cdd->pending, node) { push_desc_queue(c); list_del(&c->node); }}
static void cppi41_dma_issue_pending(struct dma_chan *chan){ struct cppi41_channel *c = to_cpp41_chan(chan); struct cppi41_dd *cdd = c->cdd; unsigned long flags; int error;
error = pm_runtime_get(cdd->ddev.dev); if ((error != -EINPROGRESS) && error < 0) { pm_runtime_put_noidle(cdd->ddev.dev); dev_err(cdd->ddev.dev, "Failed to pm_runtime_get: %i\n", error);
return; }
spin_lock_irqsave(&cdd->lock, flags); list_add_tail(&c->node, &cdd->pending); if (!cdd->is_suspended) cppi41_run_queue(cdd); spin_unlock_irqrestore(&cdd->lock, flags);
pm_runtime_put_autosuspend(cdd->ddev.dev);}
static u32 get_host_pd0(u32 length){ u32 reg;
reg = DESC_TYPE_HOST << DESC_TYPE; reg |= length;
return reg;}
static u32 get_host_pd1(struct cppi41_channel *c){ u32 reg;
reg = 0;
return reg;}
static u32 get_host_pd2(struct cppi41_channel *c){ u32 reg;
reg = DESC_TYPE_USB; reg |= c->q_comp_num;
return reg;}
static u32 get_host_pd3(u32 length){ u32 reg;
/* PD3 = packet size */ reg = length;
return reg;}
static u32 get_host_pd6(u32 length){ u32 reg;
/* PD6 buffer size */ reg = DESC_PD_COMPLETE; reg |= length;
return reg;}
static u32 get_host_pd4_or_7(u32 addr){ u32 reg;
reg = addr;
return reg;}
static u32 get_host_pd5(void){ u32 reg;
reg = 0;
return reg;}
static struct dma_async_tx_descriptor *cppi41_dma_prep_slave_sg( struct dma_chan *chan, struct scatterlist *sgl, unsigned sg_len, enum dma_transfer_direction dir, unsigned long tx_flags, void *context){ struct cppi41_channel *c = to_cpp41_chan(chan); struct dma_async_tx_descriptor *txd = NULL; struct cppi41_dd *cdd = c->cdd; struct cppi41_desc *d; struct scatterlist *sg; unsigned int i; int error;
error = pm_runtime_get(cdd->ddev.dev); if (error < 0) { pm_runtime_put_noidle(cdd->ddev.dev);
return NULL; }
if (cdd->is_suspended) goto err_out_not_ready;
d = c->desc; for_each_sg(sgl, sg, sg_len, i) { u32 addr; u32 len;
/* We need to use more than one desc once musb supports sg */ addr = lower_32_bits(sg_dma_address(sg)); len = sg_dma_len(sg);
d->pd0 = get_host_pd0(len); d->pd1 = get_host_pd1(c); d->pd2 = get_host_pd2(c); d->pd3 = get_host_pd3(len); d->pd4 = get_host_pd4_or_7(addr); d->pd5 = get_host_pd5(); d->pd6 = get_host_pd6(len); d->pd7 = get_host_pd4_or_7(addr);
d++; }
txd = &c->txd;
err_out_not_ready: pm_runtime_put_autosuspend(cdd->ddev.dev);
return txd;}
static void cppi41_compute_td_desc(struct cppi41_desc *d){ d->pd0 = DESC_TYPE_TEARD << DESC_TYPE;}
static int cppi41_tear_down_chan(struct cppi41_channel *c){ struct dmaengine_result abort_result; struct cppi41_dd *cdd = c->cdd; struct cppi41_desc *td; u32 reg; u32 desc_phys; u32 td_desc_phys;
td = cdd->cd; td += cdd->first_td_desc;
td_desc_phys = cdd->descs_phys; td_desc_phys += cdd->first_td_desc * sizeof(struct cppi41_desc);
if (!c->td_queued) { cppi41_compute_td_desc(td); __iowmb();
reg = (sizeof(struct cppi41_desc) - 24) / 4; reg |= td_desc_phys; cppi_writel(reg, cdd->qmgr_mem + QMGR_QUEUE_D(cdd->td_queue.submit));
reg = GCR_CHAN_ENABLE; if (!c->is_tx) { reg |= GCR_STARV_RETRY; reg |= GCR_DESC_TYPE_HOST; reg |= cdd->td_queue.complete; } reg |= GCR_TEARDOWN; cppi_writel(reg, c->gcr_reg); c->td_queued = 1; c->td_retry = 500; }
if (!c->td_seen || !c->td_desc_seen) {
desc_phys = cppi41_pop_desc(cdd, cdd->td_queue.complete); if (!desc_phys && c->is_tx) desc_phys = cppi41_pop_desc(cdd, c->q_comp_num);
if (desc_phys == c->desc_phys) { c->td_desc_seen = 1;
} else if (desc_phys == td_desc_phys) { u32 pd0;
__iormb(); pd0 = td->pd0; WARN_ON((pd0 >> DESC_TYPE) != DESC_TYPE_TEARD); WARN_ON(!c->is_tx && !(pd0 & TD_DESC_IS_RX)); WARN_ON((pd0 & 0x1f) != c->port_num); c->td_seen = 1; } else if (desc_phys) { WARN_ON_ONCE(1); } } c->td_retry--; /* * If the TX descriptor / channel is in use, the caller needs to poke * his TD bit multiple times. After that he hardware releases the * transfer descriptor followed by TD descriptor. Waiting seems not to * cause any difference. * RX seems to be thrown out right away. However once the TearDown * descriptor gets through we are done. If we have seen the transfer * descriptor before the TD we fetch it from enqueue, it has to be * there waiting for us. */ if (!c->td_seen && c->td_retry) { udelay(1); return -EAGAIN; } WARN_ON(!c->td_retry);
if (!c->td_desc_seen) { desc_phys = cppi41_pop_desc(cdd, c->q_num); if (!desc_phys) desc_phys = cppi41_pop_desc(cdd, c->q_comp_num); WARN_ON(!desc_phys); }
c->td_queued = 0; c->td_seen = 0; c->td_desc_seen = 0; cppi_writel(0, c->gcr_reg);
/* Invoke the callback to do the necessary clean-up */ abort_result.result = DMA_TRANS_ABORTED; dma_cookie_complete(&c->txd); dmaengine_desc_get_callback_invoke(&c->txd, &abort_result);
return 0;}
static int cppi41_stop_chan(struct dma_chan *chan){ struct cppi41_channel *c = to_cpp41_chan(chan); struct cppi41_dd *cdd = c->cdd; u32 desc_num; u32 desc_phys; int ret;
desc_phys = lower_32_bits(c->desc_phys); desc_num = (desc_phys - cdd->descs_phys) / sizeof(struct cppi41_desc); if (!cdd->chan_busy[desc_num]) { struct cppi41_channel *cc, *_ct;
/* * channels might still be in the pending list if * cppi41_dma_issue_pending() is called after * cppi41_runtime_suspend() is called */ list_for_each_entry_safe(cc, _ct, &cdd->pending, node) { if (cc != c) continue; list_del(&cc->node); break; } return 0; }
ret = cppi41_tear_down_chan(c); if (ret) return ret;
WARN_ON(!cdd->chan_busy[desc_num]); cdd->chan_busy[desc_num] = NULL;
/* Usecount for chan_busy[], paired with push_desc_queue() */ pm_runtime_put(cdd->ddev.dev);
return 0;}
static int cppi41_add_chans(struct device *dev, struct cppi41_dd *cdd){ struct cppi41_channel *cchan, *chans; int i; u32 n_chans = cdd->n_chans;
/* * The channels can only be used as TX or as RX. So we add twice * that much dma channels because USB can only do RX or TX. */ n_chans *= 2;
chans = devm_kcalloc(dev, n_chans, sizeof(*chans), GFP_KERNEL); if (!chans) return -ENOMEM;
for (i = 0; i < n_chans; i++) { cchan = &chans[i];
cchan->cdd = cdd; if (i & 1) { cchan->gcr_reg = cdd->ctrl_mem + DMA_TXGCR(i >> 1); cchan->is_tx = 1; } else { cchan->gcr_reg = cdd->ctrl_mem + DMA_RXGCR(i >> 1); cchan->is_tx = 0; } cchan->port_num = i >> 1; cchan->desc = &cdd->cd[i]; cchan->desc_phys = cdd->descs_phys; cchan->desc_phys += i * sizeof(struct cppi41_desc); cchan->chan.device = &cdd->ddev; list_add_tail(&cchan->chan.device_node, &cdd->ddev.channels); } cdd->first_td_desc = n_chans;
return 0;}
static void purge_descs(struct device *dev, struct cppi41_dd *cdd){ unsigned int mem_decs; int i;
mem_decs = ALLOC_DECS_NUM * sizeof(struct cppi41_desc);
for (i = 0; i < DESCS_AREAS; i++) {
cppi_writel(0, cdd->qmgr_mem + QMGR_MEMBASE(i)); cppi_writel(0, cdd->qmgr_mem + QMGR_MEMCTRL(i));
dma_free_coherent(dev, mem_decs, cdd->cd, cdd->descs_phys); }}
static void disable_sched(struct cppi41_dd *cdd){ cppi_writel(0, cdd->sched_mem + DMA_SCHED_CTRL);}
static void deinit_cppi41(struct device *dev, struct cppi41_dd *cdd){ disable_sched(cdd);
purge_descs(dev, cdd);
cppi_writel(0, cdd->qmgr_mem + QMGR_LRAM0_BASE); cppi_writel(0, cdd->qmgr_mem + QMGR_LRAM0_BASE); dma_free_coherent(dev, QMGR_SCRATCH_SIZE, cdd->qmgr_scratch, cdd->scratch_phys);}
static int init_descs(struct device *dev, struct cppi41_dd *cdd){ unsigned int desc_size; unsigned int mem_decs; int i; u32 reg; u32 idx;
BUILD_BUG_ON(sizeof(struct cppi41_desc) & (sizeof(struct cppi41_desc) - 1)); BUILD_BUG_ON(sizeof(struct cppi41_desc) < 32); BUILD_BUG_ON(ALLOC_DECS_NUM < 32);
desc_size = sizeof(struct cppi41_desc); mem_decs = ALLOC_DECS_NUM * desc_size;
idx = 0; for (i = 0; i < DESCS_AREAS; i++) {
reg = idx << QMGR_MEMCTRL_IDX_SH; reg |= (ilog2(desc_size) - 5) << QMGR_MEMCTRL_DESC_SH; reg |= ilog2(ALLOC_DECS_NUM) - 5;
BUILD_BUG_ON(DESCS_AREAS != 1); cdd->cd = dma_alloc_coherent(dev, mem_decs, &cdd->descs_phys, GFP_KERNEL); if (!cdd->cd) return -ENOMEM;
cppi_writel(cdd->descs_phys, cdd->qmgr_mem + QMGR_MEMBASE(i)); cppi_writel(reg, cdd->qmgr_mem + QMGR_MEMCTRL(i));
idx += ALLOC_DECS_NUM; } return 0;}
static void init_sched(struct cppi41_dd *cdd){ unsigned ch; unsigned word; u32 reg;
word = 0; cppi_writel(0, cdd->sched_mem + DMA_SCHED_CTRL); for (ch = 0; ch < cdd->n_chans; ch += 2) {
reg = SCHED_ENTRY0_CHAN(ch); reg |= SCHED_ENTRY1_CHAN(ch) | SCHED_ENTRY1_IS_RX;
reg |= SCHED_ENTRY2_CHAN(ch + 1); reg |= SCHED_ENTRY3_CHAN(ch + 1) | SCHED_ENTRY3_IS_RX; cppi_writel(reg, cdd->sched_mem + DMA_SCHED_WORD(word)); word++; } reg = cdd->n_chans * 2 - 1; reg |= DMA_SCHED_CTRL_EN; cppi_writel(reg, cdd->sched_mem + DMA_SCHED_CTRL);}
static int init_cppi41(struct device *dev, struct cppi41_dd *cdd){ int ret;
BUILD_BUG_ON(QMGR_SCRATCH_SIZE > ((1 << 14) - 1)); cdd->qmgr_scratch = dma_alloc_coherent(dev, QMGR_SCRATCH_SIZE, &cdd->scratch_phys, GFP_KERNEL); if (!cdd->qmgr_scratch) return -ENOMEM;
cppi_writel(cdd->scratch_phys, cdd->qmgr_mem + QMGR_LRAM0_BASE); cppi_writel(TOTAL_DESCS_NUM, cdd->qmgr_mem + QMGR_LRAM_SIZE); cppi_writel(0, cdd->qmgr_mem + QMGR_LRAM1_BASE);
ret = init_descs(dev, cdd); if (ret) goto err_td;
cppi_writel(cdd->td_queue.submit, cdd->ctrl_mem + DMA_TDFDQ); init_sched(cdd);
return 0;err_td: deinit_cppi41(dev, cdd); return ret;}
static struct platform_driver cpp41_dma_driver;/* * The param format is: * X Y * X: Port * Y: 0 = RX else TX */#define INFO_PORT 0#define INFO_IS_TX 1
static bool cpp41_dma_filter_fn(struct dma_chan *chan, void *param){ struct cppi41_channel *cchan; struct cppi41_dd *cdd; const struct chan_queues *queues; u32 *num = param;
if (chan->device->dev->driver != &cpp41_dma_driver.driver) return false;
cchan = to_cpp41_chan(chan);
if (cchan->port_num != num[INFO_PORT]) return false;
if (cchan->is_tx && !num[INFO_IS_TX]) return false; cdd = cchan->cdd; if (cchan->is_tx) queues = cdd->queues_tx; else queues = cdd->queues_rx;
BUILD_BUG_ON(ARRAY_SIZE(am335x_usb_queues_rx) != ARRAY_SIZE(am335x_usb_queues_tx)); if (WARN_ON(cchan->port_num >= ARRAY_SIZE(am335x_usb_queues_rx))) return false;
cchan->q_num = queues[cchan->port_num].submit; cchan->q_comp_num = queues[cchan->port_num].complete; return true;}
static struct of_dma_filter_info cpp41_dma_info = { .filter_fn = cpp41_dma_filter_fn,};
static struct dma_chan *cppi41_dma_xlate(struct of_phandle_args *dma_spec, struct of_dma *ofdma){ int count = dma_spec->args_count; struct of_dma_filter_info *info = ofdma->of_dma_data;
if (!info || !info->filter_fn) return NULL;
if (count != 2) return NULL;
return dma_request_channel(info->dma_cap, info->filter_fn, &dma_spec->args[0]);}
static const struct cppi_glue_infos am335x_usb_infos = { .queues_rx = am335x_usb_queues_rx, .queues_tx = am335x_usb_queues_tx, .td_queue = { .submit = 31, .complete = 0 }, .first_completion_queue = 93, .qmgr_num_pend = 5,};
static const struct cppi_glue_infos da8xx_usb_infos = { .queues_rx = da8xx_usb_queues_rx, .queues_tx = da8xx_usb_queues_tx, .td_queue = { .submit = 31, .complete = 0 }, .first_completion_queue = 24, .qmgr_num_pend = 2,};
static const struct of_device_id cppi41_dma_ids[] = { { .compatible = "ti,am3359-cppi41", .data = &am335x_usb_infos}, { .compatible = "ti,da830-cppi41", .data = &da8xx_usb_infos}, {},};MODULE_DEVICE_TABLE(of, cppi41_dma_ids);
static const struct cppi_glue_infos *get_glue_info(struct device *dev){ const struct of_device_id *of_id;
of_id = of_match_node(cppi41_dma_ids, dev->of_node); if (!of_id) return NULL; return of_id->data;}
#define CPPI41_DMA_BUSWIDTHS (BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) | \ BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) | \ BIT(DMA_SLAVE_BUSWIDTH_3_BYTES) | \ BIT(DMA_SLAVE_BUSWIDTH_4_BYTES))
static int cppi41_dma_probe(struct platform_device *pdev){ struct cppi41_dd *cdd; struct device *dev = &pdev->dev; const struct cppi_glue_infos *glue_info; int index; int irq; int ret;
glue_info = get_glue_info(dev); if (!glue_info) return -EINVAL;
cdd = devm_kzalloc(&pdev->dev, sizeof(*cdd), GFP_KERNEL); if (!cdd) return -ENOMEM;
dma_cap_set(DMA_SLAVE, cdd->ddev.cap_mask); cdd->ddev.device_alloc_chan_resources = cppi41_dma_alloc_chan_resources; cdd->ddev.device_free_chan_resources = cppi41_dma_free_chan_resources; cdd->ddev.device_tx_status = cppi41_dma_tx_status; cdd->ddev.device_issue_pending = cppi41_dma_issue_pending; cdd->ddev.device_prep_slave_sg = cppi41_dma_prep_slave_sg; cdd->ddev.device_terminate_all = cppi41_stop_chan; cdd->ddev.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV); cdd->ddev.src_addr_widths = CPPI41_DMA_BUSWIDTHS; cdd->ddev.dst_addr_widths = CPPI41_DMA_BUSWIDTHS; cdd->ddev.residue_granularity = DMA_RESIDUE_GRANULARITY_BURST; cdd->ddev.dev = dev; INIT_LIST_HEAD(&cdd->ddev.channels); cpp41_dma_info.dma_cap = cdd->ddev.cap_mask;
index = of_property_match_string(dev->of_node, "reg-names", "controller"); if (index < 0) return index;
cdd->ctrl_mem = devm_platform_ioremap_resource(pdev, index); if (IS_ERR(cdd->ctrl_mem)) return PTR_ERR(cdd->ctrl_mem);
cdd->sched_mem = devm_platform_ioremap_resource(pdev, index + 1); if (IS_ERR(cdd->sched_mem)) return PTR_ERR(cdd->sched_mem);
cdd->qmgr_mem = devm_platform_ioremap_resource(pdev, index + 2); if (IS_ERR(cdd->qmgr_mem)) return PTR_ERR(cdd->qmgr_mem);
spin_lock_init(&cdd->lock); INIT_LIST_HEAD(&cdd->pending);
platform_set_drvdata(pdev, cdd);
pm_runtime_enable(dev); pm_runtime_set_autosuspend_delay(dev, 100); pm_runtime_use_autosuspend(dev); ret = pm_runtime_get_sync(dev); if (ret < 0) goto err_get_sync;
cdd->queues_rx = glue_info->queues_rx; cdd->queues_tx = glue_info->queues_tx; cdd->td_queue = glue_info->td_queue; cdd->qmgr_num_pend = glue_info->qmgr_num_pend; cdd->first_completion_queue = glue_info->first_completion_queue;
/* Parse new and deprecated dma-channels properties */ ret = of_property_read_u32(dev->of_node, "dma-channels", &cdd->n_chans); if (ret) ret = of_property_read_u32(dev->of_node, "#dma-channels", &cdd->n_chans); if (ret) goto err_get_n_chans;
ret = init_cppi41(dev, cdd); if (ret) goto err_init_cppi;
ret = cppi41_add_chans(dev, cdd); if (ret) goto err_chans;
irq = irq_of_parse_and_map(dev->of_node, 0); if (!irq) { ret = -EINVAL; goto err_chans; }
ret = devm_request_irq(&pdev->dev, irq, cppi41_irq, IRQF_SHARED, dev_name(dev), cdd); if (ret) goto err_chans; cdd->irq = irq;
ret = dma_async_device_register(&cdd->ddev); if (ret) goto err_chans;
ret = of_dma_controller_register(dev->of_node, cppi41_dma_xlate, &cpp41_dma_info); if (ret) goto err_of;
pm_runtime_put_autosuspend(dev);
return 0;err_of: dma_async_device_unregister(&cdd->ddev);err_chans: deinit_cppi41(dev, cdd);err_init_cppi: pm_runtime_dont_use_autosuspend(dev);err_get_n_chans:err_get_sync: pm_runtime_put_sync(dev); pm_runtime_disable(dev); return ret;}
static void cppi41_dma_remove(struct platform_device *pdev){ struct cppi41_dd *cdd = platform_get_drvdata(pdev); int error;
error = pm_runtime_get_sync(&pdev->dev); if (error < 0) dev_err(&pdev->dev, "%s could not pm_runtime_get: %i\n", __func__, error); of_dma_controller_free(pdev->dev.of_node); dma_async_device_unregister(&cdd->ddev);
devm_free_irq(&pdev->dev, cdd->irq, cdd); deinit_cppi41(&pdev->dev, cdd); pm_runtime_dont_use_autosuspend(&pdev->dev); pm_runtime_put_sync(&pdev->dev); pm_runtime_disable(&pdev->dev);}
static int __maybe_unused cppi41_suspend(struct device *dev){ struct cppi41_dd *cdd = dev_get_drvdata(dev);
cdd->dma_tdfdq = cppi_readl(cdd->ctrl_mem + DMA_TDFDQ); disable_sched(cdd);
return 0;}
static int __maybe_unused cppi41_resume(struct device *dev){ struct cppi41_dd *cdd = dev_get_drvdata(dev); struct cppi41_channel *c; int i;
for (i = 0; i < DESCS_AREAS; i++) cppi_writel(cdd->descs_phys, cdd->qmgr_mem + QMGR_MEMBASE(i));
list_for_each_entry(c, &cdd->ddev.channels, chan.device_node) if (!c->is_tx) cppi_writel(c->q_num, c->gcr_reg + RXHPCRA0);
init_sched(cdd);
cppi_writel(cdd->dma_tdfdq, cdd->ctrl_mem + DMA_TDFDQ); cppi_writel(cdd->scratch_phys, cdd->qmgr_mem + QMGR_LRAM0_BASE); cppi_writel(QMGR_SCRATCH_SIZE, cdd->qmgr_mem + QMGR_LRAM_SIZE); cppi_writel(0, cdd->qmgr_mem + QMGR_LRAM1_BASE);
return 0;}
static int __maybe_unused cppi41_runtime_suspend(struct device *dev){ struct cppi41_dd *cdd = dev_get_drvdata(dev); unsigned long flags;
spin_lock_irqsave(&cdd->lock, flags); cdd->is_suspended = true; WARN_ON(!list_empty(&cdd->pending)); spin_unlock_irqrestore(&cdd->lock, flags);
return 0;}
static int __maybe_unused cppi41_runtime_resume(struct device *dev){ struct cppi41_dd *cdd = dev_get_drvdata(dev); unsigned long flags;
spin_lock_irqsave(&cdd->lock, flags); cdd->is_suspended = false; cppi41_run_queue(cdd); spin_unlock_irqrestore(&cdd->lock, flags);
return 0;}
static const struct dev_pm_ops cppi41_pm_ops = { SET_LATE_SYSTEM_SLEEP_PM_OPS(cppi41_suspend, cppi41_resume) SET_RUNTIME_PM_OPS(cppi41_runtime_suspend, cppi41_runtime_resume, NULL)};
static struct platform_driver cpp41_dma_driver = { .probe = cppi41_dma_probe, .remove = cppi41_dma_remove, .driver = { .name = "cppi41-dma-engine", .pm = &cppi41_pm_ops, .of_match_table = of_match_ptr(cppi41_dma_ids), },};
module_platform_driver(cpp41_dma_driver);MODULE_DESCRIPTION("Texas Instruments CPPI 4.1 DMA support");MODULE_LICENSE("GPL");MODULE_AUTHOR("Sebastian Andrzej Siewior <bigeasy@linutronix.de>");