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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
commit | ace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch) | |
tree | b2d64bc10158fdd5497876388cd68142ca374ed3 /drivers/dma/dw-edma/dw-hdma-v0-core.c | |
parent | Initial commit. (diff) | |
download | linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip |
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/dma/dw-edma/dw-hdma-v0-core.c')
-rw-r--r-- | drivers/dma/dw-edma/dw-hdma-v0-core.c | 296 |
1 files changed, 296 insertions, 0 deletions
diff --git a/drivers/dma/dw-edma/dw-hdma-v0-core.c b/drivers/dma/dw-edma/dw-hdma-v0-core.c new file mode 100644 index 0000000000..00b735a020 --- /dev/null +++ b/drivers/dma/dw-edma/dw-hdma-v0-core.c @@ -0,0 +1,296 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (c) 2023 Cai Huoqing + * Synopsys DesignWare HDMA v0 core + */ + +#include <linux/bitfield.h> +#include <linux/irqreturn.h> +#include <linux/io-64-nonatomic-lo-hi.h> + +#include "dw-edma-core.h" +#include "dw-hdma-v0-core.h" +#include "dw-hdma-v0-regs.h" +#include "dw-hdma-v0-debugfs.h" + +enum dw_hdma_control { + DW_HDMA_V0_CB = BIT(0), + DW_HDMA_V0_TCB = BIT(1), + DW_HDMA_V0_LLP = BIT(2), + DW_HDMA_V0_LIE = BIT(3), + DW_HDMA_V0_RIE = BIT(4), + DW_HDMA_V0_CCS = BIT(8), + DW_HDMA_V0_LLE = BIT(9), +}; + +static inline struct dw_hdma_v0_regs __iomem *__dw_regs(struct dw_edma *dw) +{ + return dw->chip->reg_base; +} + +static inline struct dw_hdma_v0_ch_regs __iomem * +__dw_ch_regs(struct dw_edma *dw, enum dw_edma_dir dir, u16 ch) +{ + if (dir == EDMA_DIR_WRITE) + return &(__dw_regs(dw)->ch[ch].wr); + else + return &(__dw_regs(dw)->ch[ch].rd); +} + +#define SET_CH_32(dw, dir, ch, name, value) \ + writel(value, &(__dw_ch_regs(dw, dir, ch)->name)) + +#define GET_CH_32(dw, dir, ch, name) \ + readl(&(__dw_ch_regs(dw, dir, ch)->name)) + +#define SET_BOTH_CH_32(dw, ch, name, value) \ + do { \ + writel(value, &(__dw_ch_regs(dw, EDMA_DIR_WRITE, ch)->name)); \ + writel(value, &(__dw_ch_regs(dw, EDMA_DIR_READ, ch)->name)); \ + } while (0) + +/* HDMA management callbacks */ +static void dw_hdma_v0_core_off(struct dw_edma *dw) +{ + int id; + + for (id = 0; id < HDMA_V0_MAX_NR_CH; id++) { + SET_BOTH_CH_32(dw, id, int_setup, + HDMA_V0_STOP_INT_MASK | HDMA_V0_ABORT_INT_MASK); + SET_BOTH_CH_32(dw, id, int_clear, + HDMA_V0_STOP_INT_MASK | HDMA_V0_ABORT_INT_MASK); + SET_BOTH_CH_32(dw, id, ch_en, 0); + } +} + +static u16 dw_hdma_v0_core_ch_count(struct dw_edma *dw, enum dw_edma_dir dir) +{ + u32 num_ch = 0; + int id; + + for (id = 0; id < HDMA_V0_MAX_NR_CH; id++) { + if (GET_CH_32(dw, id, dir, ch_en) & BIT(0)) + num_ch++; + } + + if (num_ch > HDMA_V0_MAX_NR_CH) + num_ch = HDMA_V0_MAX_NR_CH; + + return (u16)num_ch; +} + +static enum dma_status dw_hdma_v0_core_ch_status(struct dw_edma_chan *chan) +{ + struct dw_edma *dw = chan->dw; + u32 tmp; + + tmp = FIELD_GET(HDMA_V0_CH_STATUS_MASK, + GET_CH_32(dw, chan->id, chan->dir, ch_stat)); + + if (tmp == 1) + return DMA_IN_PROGRESS; + else if (tmp == 3) + return DMA_COMPLETE; + else + return DMA_ERROR; +} + +static void dw_hdma_v0_core_clear_done_int(struct dw_edma_chan *chan) +{ + struct dw_edma *dw = chan->dw; + + SET_CH_32(dw, chan->dir, chan->id, int_clear, HDMA_V0_STOP_INT_MASK); +} + +static void dw_hdma_v0_core_clear_abort_int(struct dw_edma_chan *chan) +{ + struct dw_edma *dw = chan->dw; + + SET_CH_32(dw, chan->dir, chan->id, int_clear, HDMA_V0_ABORT_INT_MASK); +} + +static u32 dw_hdma_v0_core_status_int(struct dw_edma_chan *chan) +{ + struct dw_edma *dw = chan->dw; + + return GET_CH_32(dw, chan->dir, chan->id, int_stat); +} + +static irqreturn_t +dw_hdma_v0_core_handle_int(struct dw_edma_irq *dw_irq, enum dw_edma_dir dir, + dw_edma_handler_t done, dw_edma_handler_t abort) +{ + struct dw_edma *dw = dw_irq->dw; + unsigned long total, pos, val; + irqreturn_t ret = IRQ_NONE; + struct dw_edma_chan *chan; + unsigned long off, mask; + + if (dir == EDMA_DIR_WRITE) { + total = dw->wr_ch_cnt; + off = 0; + mask = dw_irq->wr_mask; + } else { + total = dw->rd_ch_cnt; + off = dw->wr_ch_cnt; + mask = dw_irq->rd_mask; + } + + for_each_set_bit(pos, &mask, total) { + chan = &dw->chan[pos + off]; + + val = dw_hdma_v0_core_status_int(chan); + if (FIELD_GET(HDMA_V0_STOP_INT_MASK, val)) { + dw_hdma_v0_core_clear_done_int(chan); + done(chan); + + ret = IRQ_HANDLED; + } + + if (FIELD_GET(HDMA_V0_ABORT_INT_MASK, val)) { + dw_hdma_v0_core_clear_abort_int(chan); + abort(chan); + + ret = IRQ_HANDLED; + } + } + + return ret; +} + +static void dw_hdma_v0_write_ll_data(struct dw_edma_chunk *chunk, int i, + u32 control, u32 size, u64 sar, u64 dar) +{ + ptrdiff_t ofs = i * sizeof(struct dw_hdma_v0_lli); + + if (chunk->chan->dw->chip->flags & DW_EDMA_CHIP_LOCAL) { + struct dw_hdma_v0_lli *lli = chunk->ll_region.vaddr.mem + ofs; + + lli->control = control; + lli->transfer_size = size; + lli->sar.reg = sar; + lli->dar.reg = dar; + } else { + struct dw_hdma_v0_lli __iomem *lli = chunk->ll_region.vaddr.io + ofs; + + writel(control, &lli->control); + writel(size, &lli->transfer_size); + writeq(sar, &lli->sar.reg); + writeq(dar, &lli->dar.reg); + } +} + +static void dw_hdma_v0_write_ll_link(struct dw_edma_chunk *chunk, + int i, u32 control, u64 pointer) +{ + ptrdiff_t ofs = i * sizeof(struct dw_hdma_v0_lli); + + if (chunk->chan->dw->chip->flags & DW_EDMA_CHIP_LOCAL) { + struct dw_hdma_v0_llp *llp = chunk->ll_region.vaddr.mem + ofs; + + llp->control = control; + llp->llp.reg = pointer; + } else { + struct dw_hdma_v0_llp __iomem *llp = chunk->ll_region.vaddr.io + ofs; + + writel(control, &llp->control); + writeq(pointer, &llp->llp.reg); + } +} + +static void dw_hdma_v0_core_write_chunk(struct dw_edma_chunk *chunk) +{ + struct dw_edma_burst *child; + struct dw_edma_chan *chan = chunk->chan; + u32 control = 0, i = 0; + int j; + + if (chunk->cb) + control = DW_HDMA_V0_CB; + + j = chunk->bursts_alloc; + list_for_each_entry(child, &chunk->burst->list, list) { + j--; + if (!j) { + control |= DW_HDMA_V0_LIE; + if (!(chan->dw->chip->flags & DW_EDMA_CHIP_LOCAL)) + control |= DW_HDMA_V0_RIE; + } + + dw_hdma_v0_write_ll_data(chunk, i++, control, child->sz, + child->sar, child->dar); + } + + control = DW_HDMA_V0_LLP | DW_HDMA_V0_TCB; + if (!chunk->cb) + control |= DW_HDMA_V0_CB; + + dw_hdma_v0_write_ll_link(chunk, i, control, chunk->ll_region.paddr); +} + +static void dw_hdma_v0_core_start(struct dw_edma_chunk *chunk, bool first) +{ + struct dw_edma_chan *chan = chunk->chan; + struct dw_edma *dw = chan->dw; + u32 tmp; + + dw_hdma_v0_core_write_chunk(chunk); + + if (first) { + /* Enable engine */ + SET_CH_32(dw, chan->dir, chan->id, ch_en, BIT(0)); + /* Interrupt enable&unmask - done, abort */ + tmp = GET_CH_32(dw, chan->dir, chan->id, int_setup) | + HDMA_V0_STOP_INT_MASK | HDMA_V0_ABORT_INT_MASK | + HDMA_V0_LOCAL_STOP_INT_EN | HDMA_V0_LOCAL_STOP_INT_EN; + SET_CH_32(dw, chan->dir, chan->id, int_setup, tmp); + /* Channel control */ + SET_CH_32(dw, chan->dir, chan->id, control1, HDMA_V0_LINKLIST_EN); + /* Linked list */ + /* llp is not aligned on 64bit -> keep 32bit accesses */ + SET_CH_32(dw, chan->dir, chan->id, llp.lsb, + lower_32_bits(chunk->ll_region.paddr)); + SET_CH_32(dw, chan->dir, chan->id, llp.msb, + upper_32_bits(chunk->ll_region.paddr)); + } + /* Set consumer cycle */ + SET_CH_32(dw, chan->dir, chan->id, cycle_sync, + HDMA_V0_CONSUMER_CYCLE_STAT | HDMA_V0_CONSUMER_CYCLE_BIT); + /* Doorbell */ + SET_CH_32(dw, chan->dir, chan->id, doorbell, HDMA_V0_DOORBELL_START); +} + +static void dw_hdma_v0_core_ch_config(struct dw_edma_chan *chan) +{ + struct dw_edma *dw = chan->dw; + + /* MSI done addr - low, high */ + SET_CH_32(dw, chan->dir, chan->id, msi_stop.lsb, chan->msi.address_lo); + SET_CH_32(dw, chan->dir, chan->id, msi_stop.msb, chan->msi.address_hi); + /* MSI abort addr - low, high */ + SET_CH_32(dw, chan->dir, chan->id, msi_abort.lsb, chan->msi.address_lo); + SET_CH_32(dw, chan->dir, chan->id, msi_abort.msb, chan->msi.address_hi); + /* config MSI data */ + SET_CH_32(dw, chan->dir, chan->id, msi_msgdata, chan->msi.data); +} + +/* HDMA debugfs callbacks */ +static void dw_hdma_v0_core_debugfs_on(struct dw_edma *dw) +{ + dw_hdma_v0_debugfs_on(dw); +} + +static const struct dw_edma_core_ops dw_hdma_v0_core = { + .off = dw_hdma_v0_core_off, + .ch_count = dw_hdma_v0_core_ch_count, + .ch_status = dw_hdma_v0_core_ch_status, + .handle_int = dw_hdma_v0_core_handle_int, + .start = dw_hdma_v0_core_start, + .ch_config = dw_hdma_v0_core_ch_config, + .debugfs_on = dw_hdma_v0_core_debugfs_on, +}; + +void dw_hdma_v0_core_register(struct dw_edma *dw) +{ + dw->core = &dw_hdma_v0_core; +} |