diff options
Diffstat (limited to 'drivers/dma/dw-edma/dw-edma-v0-debugfs.c')
| -rw-r--r-- | drivers/dma/dw-edma/dw-edma-v0-debugfs.c | 292 |
1 files changed, 292 insertions, 0 deletions
diff --git a/drivers/dma/dw-edma/dw-edma-v0-debugfs.c b/drivers/dma/dw-edma/dw-edma-v0-debugfs.c new file mode 100644 index 0000000000..0745d9e7d2 --- /dev/null +++ b/drivers/dma/dw-edma/dw-edma-v0-debugfs.c @@ -0,0 +1,292 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (c) 2018-2019 Synopsys, Inc. and/or its affiliates. + * Synopsys DesignWare eDMA v0 core + * + * Author: Gustavo Pimentel <gustavo.pimentel@synopsys.com> + */ + +#include <linux/debugfs.h> +#include <linux/bitfield.h> + +#include "dw-edma-v0-debugfs.h" +#include "dw-edma-v0-regs.h" +#include "dw-edma-core.h" + +#define REGS_ADDR(dw, name) \ + ({ \ + struct dw_edma_v0_regs __iomem *__regs = (dw)->chip->reg_base; \ + \ + (void __iomem *)&__regs->name; \ + }) + +#define REGS_CH_ADDR(dw, name, _dir, _ch) \ + ({ \ + struct dw_edma_v0_ch_regs __iomem *__ch_regs; \ + \ + if ((dw)->chip->mf == EDMA_MF_EDMA_LEGACY) \ + __ch_regs = REGS_ADDR(dw, type.legacy.ch); \ + else if (_dir == EDMA_DIR_READ) \ + __ch_regs = REGS_ADDR(dw, type.unroll.ch[_ch].rd); \ + else \ + __ch_regs = REGS_ADDR(dw, type.unroll.ch[_ch].wr); \ + \ + (void __iomem *)&__ch_regs->name; \ + }) + +#define REGISTER(dw, name) \ + { dw, #name, REGS_ADDR(dw, name) } + +#define CTX_REGISTER(dw, name, dir, ch) \ + { dw, #name, REGS_CH_ADDR(dw, name, dir, ch), dir, ch } + +#define WR_REGISTER(dw, name) \ + { dw, #name, REGS_ADDR(dw, wr_##name) } +#define RD_REGISTER(dw, name) \ + { dw, #name, REGS_ADDR(dw, rd_##name) } + +#define WR_REGISTER_LEGACY(dw, name) \ + { dw, #name, REGS_ADDR(dw, type.legacy.wr_##name) } +#define RD_REGISTER_LEGACY(name) \ + { dw, #name, REGS_ADDR(dw, type.legacy.rd_##name) } + +#define WR_REGISTER_UNROLL(dw, name) \ + { dw, #name, REGS_ADDR(dw, type.unroll.wr_##name) } +#define RD_REGISTER_UNROLL(dw, name) \ + { dw, #name, REGS_ADDR(dw, type.unroll.rd_##name) } + +#define WRITE_STR "write" +#define READ_STR "read" +#define CHANNEL_STR "channel" +#define REGISTERS_STR "registers" + +struct dw_edma_debugfs_entry { + struct dw_edma *dw; + const char *name; + void __iomem *reg; + enum dw_edma_dir dir; + u16 ch; +}; + +static int dw_edma_debugfs_u32_get(void *data, u64 *val) +{ + struct dw_edma_debugfs_entry *entry = data; + struct dw_edma *dw = entry->dw; + void __iomem *reg = entry->reg; + + if (dw->chip->mf == EDMA_MF_EDMA_LEGACY && + reg >= REGS_ADDR(dw, type.legacy.ch)) { + unsigned long flags; + u32 viewport_sel; + + viewport_sel = entry->dir == EDMA_DIR_READ ? BIT(31) : 0; + viewport_sel |= FIELD_PREP(EDMA_V0_VIEWPORT_MASK, entry->ch); + + raw_spin_lock_irqsave(&dw->lock, flags); + + writel(viewport_sel, REGS_ADDR(dw, type.legacy.viewport_sel)); + *val = readl(reg); + + raw_spin_unlock_irqrestore(&dw->lock, flags); + } else { + *val = readl(reg); + } + + return 0; +} +DEFINE_DEBUGFS_ATTRIBUTE(fops_x32, dw_edma_debugfs_u32_get, NULL, "0x%08llx\n"); + +static void dw_edma_debugfs_create_x32(struct dw_edma *dw, + const struct dw_edma_debugfs_entry ini[], + int nr_entries, struct dentry *dent) +{ + struct dw_edma_debugfs_entry *entries; + int i; + + entries = devm_kcalloc(dw->chip->dev, nr_entries, sizeof(*entries), + GFP_KERNEL); + if (!entries) + return; + + for (i = 0; i < nr_entries; i++) { + entries[i] = ini[i]; + + debugfs_create_file_unsafe(entries[i].name, 0444, dent, + &entries[i], &fops_x32); + } +} + +static void dw_edma_debugfs_regs_ch(struct dw_edma *dw, enum dw_edma_dir dir, + u16 ch, struct dentry *dent) +{ + struct dw_edma_debugfs_entry debugfs_regs[] = { + CTX_REGISTER(dw, ch_control1, dir, ch), + CTX_REGISTER(dw, ch_control2, dir, ch), + CTX_REGISTER(dw, transfer_size, dir, ch), + CTX_REGISTER(dw, sar.lsb, dir, ch), + CTX_REGISTER(dw, sar.msb, dir, ch), + CTX_REGISTER(dw, dar.lsb, dir, ch), + CTX_REGISTER(dw, dar.msb, dir, ch), + CTX_REGISTER(dw, llp.lsb, dir, ch), + CTX_REGISTER(dw, llp.msb, dir, ch), + }; + int nr_entries; + + nr_entries = ARRAY_SIZE(debugfs_regs); + dw_edma_debugfs_create_x32(dw, debugfs_regs, nr_entries, dent); +} + +static noinline_for_stack void +dw_edma_debugfs_regs_wr(struct dw_edma *dw, struct dentry *dent) +{ + const struct dw_edma_debugfs_entry debugfs_regs[] = { + /* eDMA global registers */ + WR_REGISTER(dw, engine_en), + WR_REGISTER(dw, doorbell), + WR_REGISTER(dw, ch_arb_weight.lsb), + WR_REGISTER(dw, ch_arb_weight.msb), + /* eDMA interrupts registers */ + WR_REGISTER(dw, int_status), + WR_REGISTER(dw, int_mask), + WR_REGISTER(dw, int_clear), + WR_REGISTER(dw, err_status), + WR_REGISTER(dw, done_imwr.lsb), + WR_REGISTER(dw, done_imwr.msb), + WR_REGISTER(dw, abort_imwr.lsb), + WR_REGISTER(dw, abort_imwr.msb), + WR_REGISTER(dw, ch01_imwr_data), + WR_REGISTER(dw, ch23_imwr_data), + WR_REGISTER(dw, ch45_imwr_data), + WR_REGISTER(dw, ch67_imwr_data), + WR_REGISTER(dw, linked_list_err_en), + }; + const struct dw_edma_debugfs_entry debugfs_unroll_regs[] = { + /* eDMA channel context grouping */ + WR_REGISTER_UNROLL(dw, engine_chgroup), + WR_REGISTER_UNROLL(dw, engine_hshake_cnt.lsb), + WR_REGISTER_UNROLL(dw, engine_hshake_cnt.msb), + WR_REGISTER_UNROLL(dw, ch0_pwr_en), + WR_REGISTER_UNROLL(dw, ch1_pwr_en), + WR_REGISTER_UNROLL(dw, ch2_pwr_en), + WR_REGISTER_UNROLL(dw, ch3_pwr_en), + WR_REGISTER_UNROLL(dw, ch4_pwr_en), + WR_REGISTER_UNROLL(dw, ch5_pwr_en), + WR_REGISTER_UNROLL(dw, ch6_pwr_en), + WR_REGISTER_UNROLL(dw, ch7_pwr_en), + }; + struct dentry *regs_dent, *ch_dent; + int nr_entries, i; + char name[16]; + + regs_dent = debugfs_create_dir(WRITE_STR, dent); + + nr_entries = ARRAY_SIZE(debugfs_regs); + dw_edma_debugfs_create_x32(dw, debugfs_regs, nr_entries, regs_dent); + + if (dw->chip->mf == EDMA_MF_HDMA_COMPAT) { + nr_entries = ARRAY_SIZE(debugfs_unroll_regs); + dw_edma_debugfs_create_x32(dw, debugfs_unroll_regs, nr_entries, + regs_dent); + } + + for (i = 0; i < dw->wr_ch_cnt; i++) { + snprintf(name, sizeof(name), "%s:%d", CHANNEL_STR, i); + + ch_dent = debugfs_create_dir(name, regs_dent); + + dw_edma_debugfs_regs_ch(dw, EDMA_DIR_WRITE, i, ch_dent); + } +} + +static noinline_for_stack void dw_edma_debugfs_regs_rd(struct dw_edma *dw, + struct dentry *dent) +{ + const struct dw_edma_debugfs_entry debugfs_regs[] = { + /* eDMA global registers */ + RD_REGISTER(dw, engine_en), + RD_REGISTER(dw, doorbell), + RD_REGISTER(dw, ch_arb_weight.lsb), + RD_REGISTER(dw, ch_arb_weight.msb), + /* eDMA interrupts registers */ + RD_REGISTER(dw, int_status), + RD_REGISTER(dw, int_mask), + RD_REGISTER(dw, int_clear), + RD_REGISTER(dw, err_status.lsb), + RD_REGISTER(dw, err_status.msb), + RD_REGISTER(dw, linked_list_err_en), + RD_REGISTER(dw, done_imwr.lsb), + RD_REGISTER(dw, done_imwr.msb), + RD_REGISTER(dw, abort_imwr.lsb), + RD_REGISTER(dw, abort_imwr.msb), + RD_REGISTER(dw, ch01_imwr_data), + RD_REGISTER(dw, ch23_imwr_data), + RD_REGISTER(dw, ch45_imwr_data), + RD_REGISTER(dw, ch67_imwr_data), + }; + const struct dw_edma_debugfs_entry debugfs_unroll_regs[] = { + /* eDMA channel context grouping */ + RD_REGISTER_UNROLL(dw, engine_chgroup), + RD_REGISTER_UNROLL(dw, engine_hshake_cnt.lsb), + RD_REGISTER_UNROLL(dw, engine_hshake_cnt.msb), + RD_REGISTER_UNROLL(dw, ch0_pwr_en), + RD_REGISTER_UNROLL(dw, ch1_pwr_en), + RD_REGISTER_UNROLL(dw, ch2_pwr_en), + RD_REGISTER_UNROLL(dw, ch3_pwr_en), + RD_REGISTER_UNROLL(dw, ch4_pwr_en), + RD_REGISTER_UNROLL(dw, ch5_pwr_en), + RD_REGISTER_UNROLL(dw, ch6_pwr_en), + RD_REGISTER_UNROLL(dw, ch7_pwr_en), + }; + struct dentry *regs_dent, *ch_dent; + int nr_entries, i; + char name[16]; + + regs_dent = debugfs_create_dir(READ_STR, dent); + + nr_entries = ARRAY_SIZE(debugfs_regs); + dw_edma_debugfs_create_x32(dw, debugfs_regs, nr_entries, regs_dent); + + if (dw->chip->mf == EDMA_MF_HDMA_COMPAT) { + nr_entries = ARRAY_SIZE(debugfs_unroll_regs); + dw_edma_debugfs_create_x32(dw, debugfs_unroll_regs, nr_entries, + regs_dent); + } + + for (i = 0; i < dw->rd_ch_cnt; i++) { + snprintf(name, sizeof(name), "%s:%d", CHANNEL_STR, i); + + ch_dent = debugfs_create_dir(name, regs_dent); + + dw_edma_debugfs_regs_ch(dw, EDMA_DIR_READ, i, ch_dent); + } +} + +static void dw_edma_debugfs_regs(struct dw_edma *dw) +{ + const struct dw_edma_debugfs_entry debugfs_regs[] = { + REGISTER(dw, ctrl_data_arb_prior), + REGISTER(dw, ctrl), + }; + struct dentry *regs_dent; + int nr_entries; + + regs_dent = debugfs_create_dir(REGISTERS_STR, dw->dma.dbg_dev_root); + + nr_entries = ARRAY_SIZE(debugfs_regs); + dw_edma_debugfs_create_x32(dw, debugfs_regs, nr_entries, regs_dent); + + dw_edma_debugfs_regs_wr(dw, regs_dent); + dw_edma_debugfs_regs_rd(dw, regs_dent); +} + +void dw_edma_v0_debugfs_on(struct dw_edma *dw) +{ + if (!debugfs_initialized()) + return; + + debugfs_create_u32("mf", 0444, dw->dma.dbg_dev_root, &dw->chip->mf); + debugfs_create_u16("wr_ch_cnt", 0444, dw->dma.dbg_dev_root, &dw->wr_ch_cnt); + debugfs_create_u16("rd_ch_cnt", 0444, dw->dma.dbg_dev_root, &dw->rd_ch_cnt); + + dw_edma_debugfs_regs(dw); +} |