/* * Driver for the TXx9 SoC DMA Controller * * Copyright (C) 2009 Atsushi Nemoto * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #include <linux/dma-mapping.h> #include <linux/init.h> #include <linux/interrupt.h> #include <linux/io.h> #include <linux/module.h> #include <linux/platform_device.h> #include <linux/slab.h> #include <linux/scatterlist.h> #include "txx9dmac.h" static struct txx9dmac_chan *to_txx9dmac_chan(struct dma_chan *chan) { return container_of(chan, struct txx9dmac_chan, chan); } static struct txx9dmac_cregs __iomem *__dma_regs(const struct txx9dmac_chan *dc) { return dc->ch_regs; } static struct txx9dmac_cregs32 __iomem *__dma_regs32( const struct txx9dmac_chan *dc) { return dc->ch_regs; } #define channel64_readq(dc, name) \ __raw_readq(&(__dma_regs(dc)->name)) #define channel64_writeq(dc, name, val) \ __raw_writeq((val), &(__dma_regs(dc)->name)) #define channel64_readl(dc, name) \ __raw_readl(&(__dma_regs(dc)->name)) #define channel64_writel(dc, name, val) \ __raw_writel((val), &(__dma_regs(dc)->name)) #define channel32_readl(dc, name) \ __raw_readl(&(__dma_regs32(dc)->name)) #define channel32_writel(dc, name, val) \ __raw_writel((val), &(__dma_regs32(dc)->name)) #define channel_readq(dc, name) channel64_readq(dc, name) #define channel_writeq(dc, name, val) channel64_writeq(dc, name, val) #define channel_readl(dc, name) \ (is_dmac64(dc) ? \ channel64_readl(dc, name) : channel32_readl(dc, name)) #define channel_writel(dc, name, val) \ (is_dmac64(dc) ? \ channel64_writel(dc, name, val) : channel32_writel(dc, name, val)) static dma_addr_t channel64_read_CHAR(const struct txx9dmac_chan *dc) { if (sizeof(__dma_regs(dc)->CHAR) == sizeof(u64)) return channel64_readq(dc, CHAR); else return channel64_readl(dc, CHAR); } static void channel64_write_CHAR(const struct txx9dmac_chan *dc, dma_addr_t val) { if (sizeof(__dma_regs(dc)->CHAR) == sizeof(u64)) channel64_writeq(dc, CHAR, val); else channel64_writel(dc, CHAR, val); } static void channel64_clear_CHAR(const struct txx9dmac_chan *dc) { #if defined(CONFIG_32BIT) && !defined(CONFIG_64BIT_PHYS_ADDR) channel64_writel(dc, CHAR, 0); channel64_writel(dc, __pad_CHAR, 0); #else channel64_writeq(dc, CHAR, 0); #endif } static dma_addr_t channel_read_CHAR(const struct txx9dmac_chan *dc) { if (is_dmac64(dc)) return channel64_read_CHAR(dc); else return channel32_readl(dc, CHAR); } static void channel_write_CHAR(const struct txx9dmac_chan *dc, dma_addr_t val) { if (is_dmac64(dc)) channel64_write_CHAR(dc, val); else channel32_writel(dc, CHAR, val); } static struct txx9dmac_regs __iomem *__txx9dmac_regs( const struct txx9dmac_dev *ddev) { return ddev->regs; } static struct txx9dmac_regs32 __iomem *__txx9dmac_regs32( const struct txx9dmac_dev *ddev) { return ddev->regs; } #define dma64_readl(ddev, name) \ __raw_readl(&(__txx9dmac_regs(ddev)->name)) #define dma64_writel(ddev, name, val) \ __raw_writel((val), &(__txx9dmac_regs(ddev)->name)) #define dma32_readl(ddev, name) \ __raw_readl(&(__txx9dmac_regs32(ddev)->name)) #define dma32_writel(ddev, name, val) \ __raw_writel((val), &(__txx9dmac_regs32(ddev)->name)) #define dma_readl(ddev, name) \ (__is_dmac64(ddev) ? \ dma64_readl(ddev, name) : dma32_readl(ddev, name)) #define dma_writel(ddev, name, val) \ (__is_dmac64(ddev) ? \ dma64_writel(ddev, name, val) : dma32_writel(ddev, name, val)) static struct device *chan2dev(struct dma_chan *chan) { return &chan->dev->device; } static struct device *chan2parent(struct dma_chan *chan) { return chan->dev->device.parent; } static struct txx9dmac_desc * txd_to_txx9dmac_desc(struct dma_async_tx_descriptor *txd) { return container_of(txd, struct txx9dmac_desc, txd); } static dma_addr_t desc_read_CHAR(const struct txx9dmac_chan *dc, const struct txx9dmac_desc *desc) { return is_dmac64(dc) ? desc->hwdesc.CHAR : desc->hwdesc32.CHAR; } static void desc_write_CHAR(const struct txx9dmac_chan *dc, struct txx9dmac_desc *desc, dma_addr_t val) { if (is_dmac64(dc)) desc->hwdesc.CHAR = val; else desc->hwdesc32.CHAR = val; } #define TXX9_DMA_MAX_COUNT 0x04000000 #define TXX9_DMA_INITIAL_DESC_COUNT 64 static struct txx9dmac_desc *txx9dmac_first_active(struct txx9dmac_chan *dc) { return list_entry(dc->active_list.next, struct txx9dmac_desc, desc_node); } static struct txx9dmac_desc *txx9dmac_last_active(struct txx9dmac_chan *dc) { return list_entry(dc->active_list.prev, struct txx9dmac_desc, desc_node); } static struct txx9dmac_desc *txx9dmac_first_queued(struct txx9dmac_chan *dc) { return list_entry(dc->queue.next, struct txx9dmac_desc, desc_node); } static struct txx9dmac_desc *txx9dmac_last_child(struct txx9dmac_desc *desc) { if (!list_empty(&desc->txd.tx_list)) desc = list_entry(desc->txd.tx_list.prev, struct txx9dmac_desc, desc_node); return desc; } static dma_cookie_t txx9dmac_tx_submit(struct dma_async_tx_descriptor *tx); static struct txx9dmac_desc *txx9dmac_desc_alloc(struct txx9dmac_chan *dc, gfp_t flags) { struct txx9dmac_dev *ddev = dc->ddev; struct txx9dmac_desc *desc; desc = kzalloc(sizeof(*desc), flags); if (!desc) return NULL; dma_async_tx_descriptor_init(&desc->txd, &dc->chan); desc->txd.tx_submit = txx9dmac_tx_submit; /* txd.flags will be overwritten in prep funcs */ desc->txd.flags = DMA_CTRL_ACK; desc->txd.phys = dma_map_single(chan2parent(&dc->chan), &desc->hwdesc, ddev->descsize, DMA_TO_DEVICE); return desc; } static struct txx9dmac_desc *txx9dmac_desc_get(struct txx9dmac_chan *dc) { struct txx9dmac_desc *desc, *_desc; struct txx9dmac_desc *ret = NULL; unsigned int i = 0; spin_lock_bh(&dc->lock); list_for_each_entry_safe(desc, _desc, &dc->free_list, desc_node) { if (async_tx_test_ack(&desc->txd)) { list_del(&desc->desc_node); ret = desc; break; } dev_dbg(chan2dev(&dc->chan), "desc %p not ACKed\n", desc); i++; } spin_unlock_bh(&dc->lock); dev_vdbg(chan2dev(&dc->chan), "scanned %u descriptors on freelist\n", i); if (!ret) { ret = txx9dmac_desc_alloc(dc, GFP_ATOMIC); if (ret) { spin_lock_bh(&dc->lock); dc->descs_allocated++; spin_unlock_bh(&dc->lock); } else dev_err(chan2dev(&dc->chan), "not enough descriptors available\n"); } return ret; } static void txx9dmac_sync_desc_for_cpu(struct txx9dmac_chan *dc, struct txx9dmac_desc *desc) { struct txx9dmac_dev *ddev = dc->ddev; struct txx9dmac_desc *child; list_for_each_entry(child, &desc->txd.tx_list, desc_node) dma_sync_single_for_cpu(chan2parent(&dc->chan), child->txd.phys, ddev->descsize, DMA_TO_DEVICE); dma_sync_single_for_cpu(chan2parent(&dc->chan), desc->txd.phys, ddev->descsize, DMA_TO_DEVICE); } /* * Move a descriptor, including any children, to the free list. * `desc' must not be on any lists. */ static void txx9dmac_desc_put(struct txx9dmac_chan *dc, struct txx9dmac_desc *desc) { if (desc) { struct txx9dmac_desc *child; txx9dmac_sync_desc_for_cpu(dc, desc); spin_lock_bh(&dc->lock); list_for_each_entry(child, &desc->txd.tx_list, desc_node) dev_vdbg(chan2dev(&dc->chan), "moving child desc %p to freelist\n", child); list_splice_init(&desc->txd.tx_list, &dc->free_list); dev_vdbg(chan2dev(&dc->chan), "moving desc %p to freelist\n", desc); list_add(&desc->desc_node, &dc->free_list); spin_unlock_bh(&dc->lock); } } /* Called with dc->lock held and bh disabled */ static dma_cookie_t txx9dmac_assign_cookie(struct txx9dmac_chan *dc, struct txx9dmac_desc *desc) { dma_cookie_t cookie = dc->chan.cookie; if (++cookie < 0) cookie = 1; dc->chan.cookie = cookie; desc->txd.cookie = cookie; return cookie; } /*----------------------------------------------------------------------*/ static void txx9dmac_dump_regs(struct txx9dmac_chan *dc) { if (is_dmac64(dc)) dev_err(chan2dev(&dc->chan), " CHAR: %#llx SAR: %#llx DAR: %#llx CNTR: %#x" " SAIR: %#x DAIR: %#x CCR: %#x CSR: %#x\n", (u64)channel64_read_CHAR(dc), channel64_readq(dc, SAR), channel64_readq(dc, DAR), channel64_readl(dc, CNTR), channel64_readl(dc, SAIR), channel64_readl(dc, DAIR), channel64_readl(dc, CCR), channel64_readl(dc, CSR)); else dev_err(chan2dev(&dc->chan), " CHAR: %#x SAR: %#x DAR: %#x CNTR: %#x" " SAIR: %#x DAIR: %#x CCR: %#x CSR: %#x\n", channel32_readl(dc, CHAR), channel32_readl(dc, SAR), channel32_readl(dc, DAR), channel32_readl(dc, CNTR), channel32_readl(dc, SAIR), channel32_readl(dc, DAIR), channel32_readl(dc, CCR), channel32_readl(dc, CSR)); } static void txx9dmac_reset_chan(struct txx9dmac_chan *dc) { channel_writel(dc, CCR, TXX9_DMA_CCR_CHRST); if (is_dmac64(dc)) { channel64_clear_CHAR(dc); channel_writeq(dc, SAR, 0); channel_writeq(dc, DAR, 0); } else { channel_writel(dc, CHAR, 0); channel_writel(dc, SAR, 0); channel_writel(dc, DAR, 0); } channel_writel(dc, CNTR, 0); channel_writel(dc, SAIR, 0); channel_writel(dc, DAIR, 0); channel_writel(dc, CCR, 0); mmiowb(); } /* Called with dc->lock held and bh disabled */ static void txx9dmac_dostart(struct txx9dmac_chan *dc, struct txx9dmac_desc *first) { struct txx9dmac_slave *ds = dc->chan.private; u32 sai, dai; dev_vdbg(chan2dev(&dc->chan), "dostart %u %p\n", first->txd.cookie, first); /* ASSERT: channel is idle */ if (channel_readl(dc, CSR) & TXX9_DMA_CSR_XFACT) { dev_err(chan2dev(&dc->chan), "BUG: Attempted to start non-idle channel\n"); txx9dmac_dump_regs(dc); /* The tasklet will hopefully advance the queue... */ return; } if (is_dmac64(dc)) { channel64_writel(dc, CNTR, 0); channel64_writel(dc, CSR, 0xffffffff); if (ds) { if (ds->tx_reg) { sai = ds->reg_width; dai = 0; } else { sai = 0; dai = ds->reg_width; } } else { sai = 8; dai = 8; } channel64_writel(dc, SAIR, sai); channel64_writel(dc, DAIR, dai); /* All 64-bit DMAC supports SMPCHN */ channel64_writel(dc, CCR, dc->ccr); /* Writing a non zero value to CHAR will assert XFACT */ channel64_write_CHAR(dc, first->txd.phys); } else { channel32_writel(dc, CNTR, 0); channel32_writel(dc, CSR, 0xffffffff); if (ds) { if (ds->tx_reg) { sai = ds->reg_width; dai = 0; } else { sai = 0; dai = ds->reg_width; } } else { sai = 4; dai = 4; } channel32_writel(dc, SAIR, sai); channel32_writel(dc, DAIR, dai); if (txx9_dma_have_SMPCHN()) { channel32_writel(dc, CCR, dc->ccr); /* Writing a non zero value to CHAR will assert XFACT */ channel32_writel(dc, CHAR, first->txd.phys); } else { channel32_writel(dc, CHAR, first->txd.phys); channel32_writel(dc, CCR, dc->ccr); } } } /*----------------------------------------------------------------------*/ static void txx9dmac_descriptor_complete(struct txx9dmac_chan *dc, struct txx9dmac_desc *desc) { dma_async_tx_callback callback; void *param; struct dma_async_tx_descriptor *txd = &desc->txd; struct txx9dmac_slave *ds = dc->chan.private; dev_vdbg(chan2dev(&dc->chan), "descriptor %u %p complete\n", txd->cookie, desc); dc->completed = txd->cookie; callback = txd->callback; param = txd->callback_param; txx9dmac_sync_desc_for_cpu(dc, desc); list_splice_init(&txd->tx_list, &dc->free_list); list_move(&desc->desc_node, &dc->free_list); if (!ds) { dma_addr_t dmaaddr; if (!(txd->flags & DMA_COMPL_SKIP_DEST_UNMAP)) { dmaaddr = is_dmac64(dc) ? desc->hwdesc.DAR : desc->hwdesc32.DAR; if (txd->flags & DMA_COMPL_DEST_UNMAP_SINGLE) dma_unmap_single(chan2parent(&dc->chan), dmaaddr, desc->len, DMA_FROM_DEVICE); else dma_unmap_page(chan2parent(&dc->chan), dmaaddr, desc->len, DMA_FROM_DEVICE); } if (!(txd->flags & DMA_COMPL_SKIP_SRC_UNMAP)) { dmaaddr = is_dmac64(dc) ? desc->hwdesc.SAR : desc->hwdesc32.SAR; if (txd->flags & DMA_COMPL_SRC_UNMAP_SINGLE) dma_unmap_single(chan2parent(&dc->chan), dmaaddr, desc->len, DMA_TO_DEVICE); else dma_unmap_page(chan2parent(&dc->chan), dmaaddr, desc->len, DMA_TO_DEVICE); } } /* * The API requires that no submissions are done from a * callback, so we don't need to drop the lock here */ if (callback) callback(param); dma_run_dependencies(txd); } static void txx9dmac_dequeue(struct txx9dmac_chan *dc, struct list_head *list) { struct txx9dmac_dev *ddev = dc->ddev; struct txx9dmac_desc *desc; struct txx9dmac_desc *prev = NULL; BUG_ON(!list_empty(list)); do { desc = txx9dmac_first_queued(dc); if (prev) { desc_write_CHAR(dc, prev, desc->txd.phys); dma_sync_single_for_device(chan2parent(&dc->chan), prev->txd.phys, ddev->descsize, DMA_TO_DEVICE); } prev = txx9dmac_last_child(desc); list_move_tail(&desc->desc_node, list); /* Make chain-completion interrupt happen */ if ((desc->txd.flags & DMA_PREP_INTERRUPT) && !txx9dmac_chan_INTENT(dc)) break; } while (!list_empty(&dc->queue)); } static void txx9dmac_complete_all(struct txx9dmac_chan *dc) { struct txx9dmac_desc *desc, *_desc; LIST_HEAD(list); /* * Submit queued descriptors ASAP, i.e. before we go through * the completed ones. */ list_splice_init(&dc->active_list, &list); if (!list_empty(&dc->queue)) { txx9dmac_dequeue(dc, &dc->active_list); txx9dmac_dostart(dc, txx9dmac_first_active(dc)); } list_for_each_entry_safe(desc, _desc, &list, desc_node) txx9dmac_descriptor_complete(dc, desc); } static void txx9dmac_dump_desc(struct txx9dmac_chan *dc, struct txx9dmac_hwdesc *desc) { if (is_dmac64(dc)) { #ifdef TXX9_DMA_USE_SIMPLE_CHAIN dev_crit(chan2dev(&dc->chan), " desc: ch%#llx s%#llx d%#llx c%#x\n", (u64)desc->CHAR, desc->SAR, desc->DAR, desc->CNTR); #else dev_crit(chan2dev(&dc->chan), " desc: ch%#llx s%#llx d%#llx c%#x" " si%#x di%#x cc%#x cs%#x\n", (u64)desc->CHAR, desc->SAR, desc->DAR, desc->CNTR, desc->SAIR, desc->DAIR, desc->CCR, desc->CSR); #endif } else { struct txx9dmac_hwdesc32 *d = (struct txx9dmac_hwdesc32 *)desc; #ifdef TXX9_DMA_USE_SIMPLE_CHAIN dev_crit(chan2dev(&dc->chan), " desc: ch%#x s%#x d%#x c%#x\n", d->CHAR, d->SAR, d->DAR, d->CNTR); #else dev_crit(chan2dev(&dc->chan), " desc: ch%#x s%#x d%#x c%#x" " si%#x di%#x cc%#x cs%#x\n", d->CHAR, d->SAR, d->DAR, d->CNTR, d->SAIR, d->DAIR, d->CCR, d->CSR); #endif } } static void txx9dmac_handle_error(struct txx9dmac_chan *dc, u32 csr) { struct txx9dmac_desc *bad_desc; struct txx9dmac_desc *child; u32 errors; /* * The descriptor currently at the head of the active list is * borked. Since we don't have any way to report errors, we'll * just have to scream loudly and try to carry on. */ dev_crit(chan2dev(&dc->chan), "Abnormal Chain Completion\n"); txx9dmac_dump_regs(dc); bad_desc = txx9dmac_first_active(dc); list_del_init(&bad_desc->desc_node); /* Clear all error flags and try to restart the controller */ errors = csr & (TXX9_DMA_CSR_ABCHC | TXX9_DMA_CSR_CFERR | TXX9_DMA_CSR_CHERR | TXX9_DMA_CSR_DESERR | TXX9_DMA_CSR_SORERR); channel_writel(dc, CSR, errors); if (list_empty(&dc->active_list) && !list_empty(&dc->queue)) txx9dmac_dequeue(dc, &dc->active_list); if (!list_empty(&dc->active_list)) txx9dmac_dostart(dc, txx9dmac_first_active(dc)); dev_crit(chan2dev(&dc->chan), "Bad descriptor submitted for DMA! (cookie: %d)\n", bad_desc->txd.cookie); txx9dmac_dump_desc(dc, &bad_desc->hwdesc); list_for_each_entry(child, &bad_desc->txd.tx_list, desc_node) txx9dmac_dump_desc(dc, &child->hwdesc); /* Pretend the descriptor completed successfully */ txx9dmac_descriptor_complete(dc, bad_desc); } static void txx9dmac_scan_descriptors(struct txx9dmac_chan *dc) { dma_addr_t chain; struct txx9dmac_desc *desc, *_desc; struct txx9dmac_desc *child; u32 csr; if (is_dmac64(dc)) { chain = channel64_read_CHAR(dc); csr = channel64_readl(dc, CSR); channel64_writel(dc, CSR, csr); } else { chain = channel32_readl(dc, CHAR); csr = channel32_readl(dc, CSR); channel32_writel(dc, CSR, csr); } /* For dynamic chain, we should look at XFACT instead of NCHNC */ if (!(csr & (TXX9_DMA_CSR_XFACT | TXX9_DMA_CSR_ABCHC))) { /* Everything we've submitted is done */ txx9dmac_complete_all(dc); return; } if (!(csr & TXX9_DMA_CSR_CHNEN)) chain = 0; /* last descriptor of this chain */ dev_vdbg(chan2dev(&dc->chan), "scan_descriptors: char=%#llx\n", (u64)chain); list_for_each_entry_safe(desc, _desc, &dc->active_list, desc_node) { if (desc_read_CHAR(dc, desc) == chain) { /* This one is currently in progress */ if (csr & TXX9_DMA_CSR_ABCHC) goto scan_done; return; } list_for_each_entry(child, &desc->txd.tx_list, desc_node) if (desc_read_CHAR(dc, child) == chain) { /* Currently in progress */ if (csr & TXX9_DMA_CSR_ABCHC) goto scan_done; return; } /* * No descriptors so far seem to be in progress, i.e. * this one must be done. */ txx9dmac_descriptor_complete(dc, desc); } scan_done: if (csr & TXX9_DMA_CSR_ABCHC) { txx9dmac_handle_error(dc, csr); return; } dev_err(chan2dev(&dc->chan), "BUG: All descriptors done, but channel not idle!\n"); /* Try to continue after resetting the channel... */ txx9dmac_reset_chan(dc); if (!list_empty(&dc->queue)) { txx9dmac_dequeue(dc, &dc->active_list); txx9dmac_dostart(dc, txx9dmac_first_active(dc)); } } static void txx9dmac_chan_tasklet(unsigned long data) { int irq; u32 csr; struct txx9dmac_chan *dc; dc = (struct txx9dmac_chan *)data; csr = channel_readl(dc, CSR); dev_vdbg(chan2dev(&dc->chan), "tasklet: status=%x\n", csr); spin_lock(&dc->lock); if (csr & (TXX9_DMA_CSR_ABCHC | TXX9_DMA_CSR_NCHNC | TXX9_DMA_CSR_NTRNFC)) txx9dmac_scan_descriptors(dc); spin_unlock(&dc->lock); irq = dc->irq; enable_irq(irq); } static irqreturn_t txx9dmac_chan_interrupt(int irq, void *dev_id) { struct txx9dmac_chan *dc = dev_id; dev_vdbg(chan2dev(&dc->chan), "interrupt: status=%#x\n", channel_readl(dc, CSR)); tasklet_schedule(&dc->tasklet); /* * Just disable the interrupts. We'll turn them back on in the * softirq handler. */ disable_irq_nosync(irq); return IRQ_HANDLED; } static void txx9dmac_tasklet(unsigned long data) { int irq; u32 csr; struct txx9dmac_chan *dc; struct txx9dmac_dev *ddev = (struct txx9dmac_dev *)data; u32 mcr; int i; mcr = dma_readl(ddev, MCR); dev_vdbg(ddev->chan[0]->dma.dev, "tasklet: mcr=%x\n", mcr); for (i = 0; i < TXX9_DMA_MAX_NR_CHANNELS; i++) { if ((mcr >> (24 + i)) & 0x11) { dc = ddev->chan[i]; csr = channel_readl(dc, CSR); dev_vdbg(chan2dev(&dc->chan), "tasklet: status=%x\n", csr); spin_lock(&dc->lock); if (csr & (TXX9_DMA_CSR_ABCHC | TXX9_DMA_CSR_NCHNC | TXX9_DMA_CSR_NTRNFC)) txx9dmac_scan_descriptors(dc); spin_unlock(&dc->lock); } } irq = ddev->irq; enable_irq(irq); } static irqreturn_t txx9dmac_interrupt(int irq, void *dev_id) { struct txx9dmac_dev *ddev = dev_id; dev_vdbg(ddev->chan[0]->dma.dev, "interrupt: status=%#x\n", dma_readl(ddev, MCR)); tasklet_schedule(&ddev->tasklet); /* * Just disable the interrupts. We'll turn them back on in the * softirq handler. */ disable_irq_nosync(irq); return IRQ_HANDLED; } /*----------------------------------------------------------------------*/ static dma_cookie_t txx9dmac_tx_submit(struct dma_async_tx_descriptor *tx) { struct txx9dmac_desc *desc = txd_to_txx9dmac_desc(tx); struct txx9dmac_chan *dc = to_txx9dmac_chan(tx->chan); dma_cookie_t cookie; spin_lock_bh(&dc->lock); cookie = txx9dmac_assign_cookie(dc, desc); dev_vdbg(chan2dev(tx->chan), "tx_submit: queued %u %p\n", desc->txd.cookie, desc); list_add_tail(&desc->desc_node, &dc->queue); spin_unlock_bh(&dc->lock); return cookie; } static struct dma_async_tx_descriptor * txx9dmac_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src, size_t len, unsigned long flags) { struct txx9dmac_chan *dc = to_txx9dmac_chan(chan); struct txx9dmac_dev *ddev = dc->ddev; struct txx9dmac_desc *desc; struct txx9dmac_desc *first; struct txx9dmac_desc *prev; size_t xfer_count; size_t offset; dev_vdbg(chan2dev(chan), "prep_dma_memcpy d%#llx s%#llx l%#zx f%#lx\n", (u64)dest, (u64)src, len, flags); if (unlikely(!len)) { dev_dbg(chan2dev(chan), "prep_dma_memcpy: length is zero!\n"); return NULL; } prev = first = NULL; for (offset = 0; offset < len; offset += xfer_count) { xfer_count = min_t(size_t, len - offset, TXX9_DMA_MAX_COUNT); /* * Workaround for ERT-TX49H2-033, ERT-TX49H3-020, * ERT-TX49H4-016 (slightly conservative) */ if (__is_dmac64(ddev)) { if (xfer_count > 0x100 && (xfer_count & 0xff) >= 0xfa && (xfer_count & 0xff) <= 0xff) xfer_count -= 0x20; } else { if (xfer_count > 0x80 && (xfer_count & 0x7f) >= 0x7e && (xfer_count & 0x7f) <= 0x7f) xfer_count -= 0x20; } desc = txx9dmac_desc_get(dc); if (!desc) { txx9dmac_desc_put(dc, first); return NULL; } if (__is_dmac64(ddev)) { desc->hwdesc.SAR = src + offset; desc->hwdesc.DAR = dest + offset; desc->hwdesc.CNTR = xfer_count; txx9dmac_desc_set_nosimple(ddev, desc, 8, 8, dc->ccr | TXX9_DMA_CCR_XFACT); } else { desc->hwdesc32.SAR = src + offset; desc->hwdesc32.DAR = dest + offset; desc->hwdesc32.CNTR = xfer_count; txx9dmac_desc_set_nosimple(ddev, desc, 4, 4, dc->ccr | TXX9_DMA_CCR_XFACT); } /* * The descriptors on tx_list are not reachable from * the dc->queue list or dc->active_list after a * submit. If we put all descriptors on active_list, * calling of callback on the completion will be more * complex. */ if (!first) { first = desc; } else { desc_write_CHAR(dc, prev, desc->txd.phys); dma_sync_single_for_device(chan2parent(&dc->chan), prev->txd.phys, ddev->descsize, DMA_TO_DEVICE); list_add_tail(&desc->desc_node, &first->txd.tx_list); } prev = desc; } /* Trigger interrupt after last block */ if (flags & DMA_PREP_INTERRUPT) txx9dmac_desc_set_INTENT(ddev, prev); desc_write_CHAR(dc, prev, 0); dma_sync_single_for_device(chan2parent(&dc->chan), prev->txd.phys, ddev->descsize, DMA_TO_DEVICE); first->txd.flags = flags; first->len = len; return &first->txd; } static struct dma_async_tx_descriptor * txx9dmac_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl, unsigned int sg_len, enum dma_data_direction direction, unsigned long flags) { struct txx9dmac_chan *dc = to_txx9dmac_chan(chan); struct txx9dmac_dev *ddev = dc->ddev; struct txx9dmac_slave *ds = chan->private; struct txx9dmac_desc *prev; struct txx9dmac_desc *first; unsigned int i; struct scatterlist *sg; dev_vdbg(chan2dev(chan), "prep_dma_slave\n"); BUG_ON(!ds || !ds->reg_width); if (ds->tx_reg) BUG_ON(direction != DMA_TO_DEVICE); else BUG_ON(direction != DMA_FROM_DEVICE); if (unlikely(!sg_len)) return NULL; prev = first = NULL; for_each_sg(sgl, sg, sg_len, i) { struct txx9dmac_desc *desc; dma_addr_t mem; u32 sai, dai; desc = txx9dmac_desc_get(dc); if (!desc) { txx9dmac_desc_put(dc, first); return NULL; } mem = sg_dma_address(sg); if (__is_dmac64(ddev)) { if (direction == DMA_TO_DEVICE) { desc->hwdesc.SAR = mem; desc->hwdesc.DAR = ds->tx_reg; } else { desc->hwdesc.SAR = ds->rx_reg; desc->hwdesc.DAR = mem; } desc->hwdesc.CNTR = sg_dma_len(sg); } else { if (direction == DMA_TO_DEVICE) { desc->hwdesc32.SAR = mem; desc->hwdesc32.DAR = ds->tx_reg; } else { desc->hwdesc32.SAR = ds->rx_reg; desc->hwdesc32.DAR = mem; } desc->hwdesc32.CNTR = sg_dma_len(sg); } if (direction == DMA_TO_DEVICE) { sai = ds->reg_width; dai = 0; } else { sai = 0; dai = ds->reg_width; } txx9dmac_desc_set_nosimple(ddev, desc, sai, dai, dc->ccr | TXX9_DMA_CCR_XFACT); if (!first) { first = desc; } else { desc_write_CHAR(dc, prev, desc->txd.phys); dma_sync_single_for_device(chan2parent(&dc->chan), prev->txd.phys, ddev->descsize, DMA_TO_DEVICE); list_add_tail(&desc->desc_node, &first->txd.tx_list); } prev = desc; } /* Trigger interrupt after last block */ if (flags & DMA_PREP_INTERRUPT) txx9dmac_desc_set_INTENT(ddev, prev); desc_write_CHAR(dc, prev, 0); dma_sync_single_for_device(chan2parent(&dc->chan), prev->txd.phys, ddev->descsize, DMA_TO_DEVICE); first->txd.flags = flags; first->len = 0; return &first->txd; } static void txx9dmac_terminate_all(struct dma_chan *chan) { struct txx9dmac_chan *dc = to_txx9dmac_chan(chan); struct txx9dmac_desc *desc, *_desc; LIST_HEAD(list); dev_vdbg(chan2dev(chan), "terminate_all\n"); spin_lock_bh(&dc->lock); txx9dmac_reset_chan(dc); /* active_list entries will end up before queued entries */ list_splice_init(&dc->queue, &list); list_splice_init(&dc->active_list, &list); spin_unlock_bh(&dc->lock); /* Flush all pending and queued descriptors */ list_for_each_entry_safe(desc, _desc, &list, desc_node) txx9dmac_descriptor_complete(dc, desc); } static enum dma_status txx9dmac_is_tx_complete(struct dma_chan *chan, dma_cookie_t cookie, dma_cookie_t *done, dma_cookie_t *used) { struct txx9dmac_chan *dc = to_txx9dmac_chan(chan); dma_cookie_t last_used; dma_cookie_t last_complete; int ret; last_complete = dc->completed; last_used = chan->cookie; ret = dma_async_is_complete(cookie, last_complete, last_used); if (ret != DMA_SUCCESS) { spin_lock_bh(&dc->lock); txx9dmac_scan_descriptors(dc); spin_unlock_bh(&dc->lock); last_complete = dc->completed; last_used = chan->cookie; ret = dma_async_is_complete(cookie, last_complete, last_used); } if (done) *done = last_complete; if (used) *used = last_used; return ret; } static void txx9dmac_chain_dynamic(struct txx9dmac_chan *dc, struct txx9dmac_desc *prev) { struct txx9dmac_dev *ddev = dc->ddev; struct txx9dmac_desc *desc; LIST_HEAD(list); prev = txx9dmac_last_child(prev); txx9dmac_dequeue(dc, &list); desc = list_entry(list.next, struct txx9dmac_desc, desc_node); desc_write_CHAR(dc, prev, desc->txd.phys); dma_sync_single_for_device(chan2parent(&dc->chan), prev->txd.phys, ddev->descsize, DMA_TO_DEVICE); mmiowb(); if (!(channel_readl(dc, CSR) & TXX9_DMA_CSR_CHNEN) && channel_read_CHAR(dc) == prev->txd.phys) /* Restart chain DMA */ channel_write_CHAR(dc, desc->txd.phys); list_splice_tail(&list, &dc->active_list); } static void txx9dmac_issue_pending(struct dma_chan *chan) { struct txx9dmac_chan *dc = to_txx9dmac_chan(chan); spin_lock_bh(&dc->lock); if (!list_empty(&dc->active_list)) txx9dmac_scan_descriptors(dc); if (!list_empty(&dc->queue)) { if (list_empty(&dc->active_list)) { txx9dmac_dequeue(dc, &dc->active_list); txx9dmac_dostart(dc, txx9dmac_first_active(dc)); } else if (txx9_dma_have_SMPCHN()) { struct txx9dmac_desc *prev = txx9dmac_last_active(dc); if (!(prev->txd.flags & DMA_PREP_INTERRUPT) || txx9dmac_chan_INTENT(dc)) txx9dmac_chain_dynamic(dc, prev); } } spin_unlock_bh(&dc->lock); } static int txx9dmac_alloc_chan_resources(struct dma_chan *chan) { struct txx9dmac_chan *dc = to_txx9dmac_chan(chan); struct txx9dmac_slave *ds = chan->private; struct txx9dmac_desc *desc; int i; dev_vdbg(chan2dev(chan), "alloc_chan_resources\n"); /* ASSERT: channel is idle */ if (channel_readl(dc, CSR) & TXX9_DMA_CSR_XFACT) { dev_dbg(chan2dev(chan), "DMA channel not idle?\n"); return -EIO; } dc->completed = chan->cookie = 1; dc->ccr = TXX9_DMA_CCR_IMMCHN | TXX9_DMA_CCR_INTENE | CCR_LE; txx9dmac_chan_set_SMPCHN(dc); if (!txx9_dma_have_SMPCHN() || (dc->ccr & TXX9_DMA_CCR_SMPCHN)) dc->ccr |= TXX9_DMA_CCR_INTENC; if (chan->device->device_prep_dma_memcpy) { if (ds) return -EINVAL; dc->ccr |= TXX9_DMA_CCR_XFSZ_X8; } else { if (!ds || (ds->tx_reg && ds->rx_reg) || (!ds->tx_reg && !ds->rx_reg)) return -EINVAL; dc->ccr |= TXX9_DMA_CCR_EXTRQ | TXX9_DMA_CCR_XFSZ(__ffs(ds->reg_width)); txx9dmac_chan_set_INTENT(dc); } spin_lock_bh(&dc->lock); i = dc->descs_allocated; while (dc->descs_allocated < TXX9_DMA_INITIAL_DESC_COUNT) { spin_unlock_bh(&dc->lock); desc = txx9dmac_desc_alloc(dc, GFP_KERNEL); if (!desc) { dev_info(chan2dev(chan), "only allocated %d descriptors\n", i); spin_lock_bh(&dc->lock); break; } txx9dmac_desc_put(dc, desc); spin_lock_bh(&dc->lock); i = ++dc->descs_allocated; } spin_unlock_bh(&dc->lock); dev_dbg(chan2dev(chan), "alloc_chan_resources allocated %d descriptors\n", i); return i; } static void txx9dmac_free_chan_resources(struct dma_chan *chan) { struct txx9dmac_chan *dc = to_txx9dmac_chan(chan); struct txx9dmac_dev *ddev = dc->ddev; struct txx9dmac_desc *desc, *_desc; LIST_HEAD(list); dev_dbg(chan2dev(chan), "free_chan_resources (descs allocated=%u)\n", dc->descs_allocated); /* ASSERT: channel is idle */ BUG_ON(!list_empty(&dc->active_list)); BUG_ON(!list_empty(&dc->queue)); BUG_ON(channel_readl(dc, CSR) & TXX9_DMA_CSR_XFACT); spin_lock_bh(&dc->lock); list_splice_init(&dc->free_list, &list); dc->descs_allocated = 0; spin_unlock_bh(&dc->lock); list_for_each_entry_safe(desc, _desc, &list, desc_node) { dev_vdbg(chan2dev(chan), " freeing descriptor %p\n", desc); dma_unmap_single(chan2parent(chan), desc->txd.phys, ddev->descsize, DMA_TO_DEVICE); kfree(desc); } dev_vdbg(chan2dev(chan), "free_chan_resources done\n"); } /*----------------------------------------------------------------------*/ static void txx9dmac_off(struct txx9dmac_dev *ddev) { dma_writel(ddev, MCR, 0); mmiowb(); } static int __init txx9dmac_chan_probe(struct platform_device *pdev) { struct txx9dmac_chan_platform_data *cpdata = pdev->dev.platform_data; struct platform_device *dmac_dev = cpdata->dmac_dev; struct txx9dmac_platform_data *pdata = dmac_dev->dev.platform_data; struct txx9dmac_chan *dc; int err; int ch = pdev->id % TXX9_DMA_MAX_NR_CHANNELS; int irq; dc = devm_kzalloc(&pdev->dev, sizeof(*dc), GFP_KERNEL); if (!dc) return -ENOMEM; dc->dma.dev = &pdev->dev; dc->dma.device_alloc_chan_resources = txx9dmac_alloc_chan_resources; dc->dma.device_free_chan_resources = txx9dmac_free_chan_resources; dc->dma.device_terminate_all = txx9dmac_terminate_all; dc->dma.device_is_tx_complete = txx9dmac_is_tx_complete; dc->dma.device_issue_pending = txx9dmac_issue_pending; if (pdata && pdata->memcpy_chan == ch) { dc->dma.device_prep_dma_memcpy = txx9dmac_prep_dma_memcpy; dma_cap_set(DMA_MEMCPY, dc->dma.cap_mask); } else { dc->dma.device_prep_slave_sg = txx9dmac_prep_slave_sg; dma_cap_set(DMA_SLAVE, dc->dma.cap_mask); dma_cap_set(DMA_PRIVATE, dc->dma.cap_mask); } INIT_LIST_HEAD(&dc->dma.channels); dc->ddev = platform_get_drvdata(dmac_dev); if (dc->ddev->irq < 0) { irq = platform_get_irq(pdev, 0); if (irq < 0) return irq; tasklet_init(&dc->tasklet, txx9dmac_chan_tasklet, (unsigned long)dc); dc->irq = irq; err = devm_request_irq(&pdev->dev, dc->irq, txx9dmac_chan_interrupt, 0, dev_name(&pdev->dev), dc); if (err) return err; } else dc->irq = -1; dc->ddev->chan[ch] = dc; dc->chan.device = &dc->dma; list_add_tail(&dc->chan.device_node, &dc->chan.device->channels); dc->chan.cookie = dc->completed = 1; if (is_dmac64(dc)) dc->ch_regs = &__txx9dmac_regs(dc->ddev)->CHAN[ch]; else dc->ch_regs = &__txx9dmac_regs32(dc->ddev)->CHAN[ch]; spin_lock_init(&dc->lock); INIT_LIST_HEAD(&dc->active_list); INIT_LIST_HEAD(&dc->queue); INIT_LIST_HEAD(&dc->free_list); txx9dmac_reset_chan(dc); platform_set_drvdata(pdev, dc); err = dma_async_device_register(&dc->dma); if (err) return err; dev_dbg(&pdev->dev, "TXx9 DMA Channel (dma%d%s%s)\n", dc->dma.dev_id, dma_has_cap(DMA_MEMCPY, dc->dma.cap_mask) ? " memcpy" : "", dma_has_cap(DMA_SLAVE, dc->dma.cap_mask) ? " slave" : ""); return 0; } static int __exit txx9dmac_chan_remove(struct platform_device *pdev) { struct txx9dmac_chan *dc = platform_get_drvdata(pdev); dma_async_device_unregister(&dc->dma); if (dc->irq >= 0) tasklet_kill(&dc->tasklet); dc->ddev->chan[pdev->id % TXX9_DMA_MAX_NR_CHANNELS] = NULL; return 0; } static int __init txx9dmac_probe(struct platform_device *pdev) { struct txx9dmac_platform_data *pdata = pdev->dev.platform_data; struct resource *io; struct txx9dmac_dev *ddev; u32 mcr; int err; io = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (!io) return -EINVAL; ddev = devm_kzalloc(&pdev->dev, sizeof(*ddev), GFP_KERNEL); if (!ddev) return -ENOMEM; if (!devm_request_mem_region(&pdev->dev, io->start, resource_size(io), dev_name(&pdev->dev))) return -EBUSY; ddev->regs = devm_ioremap(&pdev->dev, io->start, resource_size(io)); if (!ddev->regs) return -ENOMEM; ddev->have_64bit_regs = pdata->have_64bit_regs; if (__is_dmac64(ddev)) ddev->descsize = sizeof(struct txx9dmac_hwdesc); else ddev->descsize = sizeof(struct txx9dmac_hwdesc32); /* force dma off, just in case */ txx9dmac_off(ddev); ddev->irq = platform_get_irq(pdev, 0); if (ddev->irq >= 0) { tasklet_init(&ddev->tasklet, txx9dmac_tasklet, (unsigned long)ddev); err = devm_request_irq(&pdev->dev, ddev->irq, txx9dmac_interrupt, 0, dev_name(&pdev->dev), ddev); if (err) return err; } mcr = TXX9_DMA_MCR_MSTEN | MCR_LE; if (pdata && pdata->memcpy_chan >= 0) mcr |= TXX9_DMA_MCR_FIFUM(pdata->memcpy_chan); dma_writel(ddev, MCR, mcr); platform_set_drvdata(pdev, ddev); return 0; } static int __exit txx9dmac_remove(struct platform_device *pdev) { struct txx9dmac_dev *ddev = platform_get_drvdata(pdev); txx9dmac_off(ddev); if (ddev->irq >= 0) tasklet_kill(&ddev->tasklet); return 0; } static void txx9dmac_shutdown(struct platform_device *pdev) { struct txx9dmac_dev *ddev = platform_get_drvdata(pdev); txx9dmac_off(ddev); } static int txx9dmac_suspend_late(struct platform_device *pdev, pm_message_t mesg) { struct txx9dmac_dev *ddev = platform_get_drvdata(pdev); txx9dmac_off(ddev); return 0; } static int txx9dmac_resume_early(struct platform_device *pdev) { struct txx9dmac_dev *ddev = platform_get_drvdata(pdev); struct txx9dmac_platform_data *pdata = pdev->dev.platform_data; u32 mcr; mcr = TXX9_DMA_MCR_MSTEN | MCR_LE; if (pdata && pdata->memcpy_chan >= 0) mcr |= TXX9_DMA_MCR_FIFUM(pdata->memcpy_chan); dma_writel(ddev, MCR, mcr); return 0; } static struct platform_driver txx9dmac_chan_driver = { .remove = __exit_p(txx9dmac_chan_remove), .driver = { .name = "txx9dmac-chan", }, }; static struct platform_driver txx9dmac_driver = { .remove = __exit_p(txx9dmac_remove), .shutdown = txx9dmac_shutdown, .suspend_late = txx9dmac_suspend_late, .resume_early = txx9dmac_resume_early, .driver = { .name = "txx9dmac", }, }; static int __init txx9dmac_init(void) { int rc; rc = platform_driver_probe(&txx9dmac_driver, txx9dmac_probe); if (!rc) { rc = platform_driver_probe(&txx9dmac_chan_driver, txx9dmac_chan_probe); if (rc) platform_driver_unregister(&txx9dmac_driver); } return rc; } module_init(txx9dmac_init); static void __exit txx9dmac_exit(void) { platform_driver_unregister(&txx9dmac_chan_driver); platform_driver_unregister(&txx9dmac_driver); } module_exit(txx9dmac_exit); MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("TXx9 DMA Controller driver"); MODULE_AUTHOR("Atsushi Nemoto <anemo@mba.ocn.ne.jp>");