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linux/drivers/dma/dw-edma/dw-edma-v0-debugfs.c
Arnd Bergmann 756c3ef934 dmaengine: dw-edma: fix __iomem type confusion 
The new driver mixes up dma_addr_t and __iomem pointers, which results
in warnings on some 32-bit architectures, like:

drivers/dma/dw-edma/dw-edma-v0-core.c: In function '__dw_regs':
drivers/dma/dw-edma/dw-edma-v0-core.c:28:9: error: cast to pointer from integer of different size [-Werror=int-to-pointer-cast]
  return (struct dw_edma_v0_regs __iomem *)dw->rg_region.vaddr;

Make it use __iomem pointers consistently here, and avoid using dma_addr_t
for __iomem tokens altogether.

A small complication here is the debugfs code, which passes an __iomem
token as the private data for debugfs files, requiring the use of
extra __force.

Fixes: 7e4b8a4fbe ("dmaengine: Add Synopsys eDMA IP version 0 support")
Link: https://lore.kernel.org/lkml/20190617131918.2518727-1-arnd@arndb.de/
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/r/20190722124457.1093886-2-arnd@arndb.de
Signed-off-by: Vinod Koul <vkoul@kernel.org>
2019-07-22 20:58:00 +05:30

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// 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(name) \
((void __force *)&regs->name)
#define REGISTER(name) \
{ #name, REGS_ADDR(name) }
#define WR_REGISTER(name) \
{ #name, REGS_ADDR(wr_##name) }
#define RD_REGISTER(name) \
{ #name, REGS_ADDR(rd_##name) }
#define WR_REGISTER_LEGACY(name) \
{ #name, REGS_ADDR(type.legacy.wr_##name) }
#define RD_REGISTER_LEGACY(name) \
{ #name, REGS_ADDR(type.legacy.rd_##name) }
#define WR_REGISTER_UNROLL(name) \
{ #name, REGS_ADDR(type.unroll.wr_##name) }
#define RD_REGISTER_UNROLL(name) \
{ #name, REGS_ADDR(type.unroll.rd_##name) }
#define WRITE_STR "write"
#define READ_STR "read"
#define CHANNEL_STR "channel"
#define REGISTERS_STR "registers"
static struct dentry *base_dir;
static struct dw_edma *dw;
static struct dw_edma_v0_regs __iomem *regs;
static struct {
void __iomem *start;
void __iomem *end;
} lim[2][EDMA_V0_MAX_NR_CH];
struct debugfs_entries {
const char *name;
dma_addr_t *reg;
};
static int dw_edma_debugfs_u32_get(void *data, u64 *val)
{
void __iomem *reg = (void __force __iomem *)data;
if (dw->mode == EDMA_MODE_LEGACY &&
reg >= (void __iomem *)&regs->type.legacy.ch) {
void __iomem *ptr = &regs->type.legacy.ch;
u32 viewport_sel = 0;
unsigned long flags;
u16 ch;
for (ch = 0; ch < dw->wr_ch_cnt; ch++)
if (lim[0][ch].start >= reg && reg < lim[0][ch].end) {
ptr += (reg - lim[0][ch].start);
goto legacy_sel_wr;
}
for (ch = 0; ch < dw->rd_ch_cnt; ch++)
if (lim[1][ch].start >= reg && reg < lim[1][ch].end) {
ptr += (reg - lim[1][ch].start);
goto legacy_sel_rd;
}
return 0;
legacy_sel_rd:
viewport_sel = BIT(31);
legacy_sel_wr:
viewport_sel |= FIELD_PREP(EDMA_V0_VIEWPORT_MASK, ch);
raw_spin_lock_irqsave(&dw->lock, flags);
writel(viewport_sel, &regs->type.legacy.viewport_sel);
*val = readl(ptr);
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(const struct debugfs_entries entries[],
int nr_entries, struct dentry *dir)
{
int i;
for (i = 0; i < nr_entries; i++) {
if (!debugfs_create_file_unsafe(entries[i].name, 0444, dir,
entries[i].reg, &fops_x32))
break;
}
}
static void dw_edma_debugfs_regs_ch(struct dw_edma_v0_ch_regs __iomem *regs,
struct dentry *dir)
{
int nr_entries;
const struct debugfs_entries debugfs_regs[] = {
REGISTER(ch_control1),
REGISTER(ch_control2),
REGISTER(transfer_size),
REGISTER(sar_low),
REGISTER(sar_high),
REGISTER(dar_low),
REGISTER(dar_high),
REGISTER(llp_low),
REGISTER(llp_high),
};
nr_entries = ARRAY_SIZE(debugfs_regs);
dw_edma_debugfs_create_x32(debugfs_regs, nr_entries, dir);
}
static void dw_edma_debugfs_regs_wr(struct dentry *dir)
{
const struct debugfs_entries debugfs_regs[] = {
/* eDMA global registers */
WR_REGISTER(engine_en),
WR_REGISTER(doorbell),
WR_REGISTER(ch_arb_weight_low),
WR_REGISTER(ch_arb_weight_high),
/* eDMA interrupts registers */
WR_REGISTER(int_status),
WR_REGISTER(int_mask),
WR_REGISTER(int_clear),
WR_REGISTER(err_status),
WR_REGISTER(done_imwr_low),
WR_REGISTER(done_imwr_high),
WR_REGISTER(abort_imwr_low),
WR_REGISTER(abort_imwr_high),
WR_REGISTER(ch01_imwr_data),
WR_REGISTER(ch23_imwr_data),
WR_REGISTER(ch45_imwr_data),
WR_REGISTER(ch67_imwr_data),
WR_REGISTER(linked_list_err_en),
};
const struct debugfs_entries debugfs_unroll_regs[] = {
/* eDMA channel context grouping */
WR_REGISTER_UNROLL(engine_chgroup),
WR_REGISTER_UNROLL(engine_hshake_cnt_low),
WR_REGISTER_UNROLL(engine_hshake_cnt_high),
WR_REGISTER_UNROLL(ch0_pwr_en),
WR_REGISTER_UNROLL(ch1_pwr_en),
WR_REGISTER_UNROLL(ch2_pwr_en),
WR_REGISTER_UNROLL(ch3_pwr_en),
WR_REGISTER_UNROLL(ch4_pwr_en),
WR_REGISTER_UNROLL(ch5_pwr_en),
WR_REGISTER_UNROLL(ch6_pwr_en),
WR_REGISTER_UNROLL(ch7_pwr_en),
};
struct dentry *regs_dir, *ch_dir;
int nr_entries, i;
char name[16];
regs_dir = debugfs_create_dir(WRITE_STR, dir);
if (!regs_dir)
return;
nr_entries = ARRAY_SIZE(debugfs_regs);
dw_edma_debugfs_create_x32(debugfs_regs, nr_entries, regs_dir);
if (dw->mode == EDMA_MODE_UNROLL) {
nr_entries = ARRAY_SIZE(debugfs_unroll_regs);
dw_edma_debugfs_create_x32(debugfs_unroll_regs, nr_entries,
regs_dir);
}
for (i = 0; i < dw->wr_ch_cnt; i++) {
snprintf(name, sizeof(name), "%s:%d", CHANNEL_STR, i);
ch_dir = debugfs_create_dir(name, regs_dir);
if (!ch_dir)
return;
dw_edma_debugfs_regs_ch(&regs->type.unroll.ch[i].wr, ch_dir);
lim[0][i].start = &regs->type.unroll.ch[i].wr;
lim[0][i].end = &regs->type.unroll.ch[i].padding_1[0];
}
}
static void dw_edma_debugfs_regs_rd(struct dentry *dir)
{
const struct debugfs_entries debugfs_regs[] = {
/* eDMA global registers */
RD_REGISTER(engine_en),
RD_REGISTER(doorbell),
RD_REGISTER(ch_arb_weight_low),
RD_REGISTER(ch_arb_weight_high),
/* eDMA interrupts registers */
RD_REGISTER(int_status),
RD_REGISTER(int_mask),
RD_REGISTER(int_clear),
RD_REGISTER(err_status_low),
RD_REGISTER(err_status_high),
RD_REGISTER(linked_list_err_en),
RD_REGISTER(done_imwr_low),
RD_REGISTER(done_imwr_high),
RD_REGISTER(abort_imwr_low),
RD_REGISTER(abort_imwr_high),
RD_REGISTER(ch01_imwr_data),
RD_REGISTER(ch23_imwr_data),
RD_REGISTER(ch45_imwr_data),
RD_REGISTER(ch67_imwr_data),
};
const struct debugfs_entries debugfs_unroll_regs[] = {
/* eDMA channel context grouping */
RD_REGISTER_UNROLL(engine_chgroup),
RD_REGISTER_UNROLL(engine_hshake_cnt_low),
RD_REGISTER_UNROLL(engine_hshake_cnt_high),
RD_REGISTER_UNROLL(ch0_pwr_en),
RD_REGISTER_UNROLL(ch1_pwr_en),
RD_REGISTER_UNROLL(ch2_pwr_en),
RD_REGISTER_UNROLL(ch3_pwr_en),
RD_REGISTER_UNROLL(ch4_pwr_en),
RD_REGISTER_UNROLL(ch5_pwr_en),
RD_REGISTER_UNROLL(ch6_pwr_en),
RD_REGISTER_UNROLL(ch7_pwr_en),
};
struct dentry *regs_dir, *ch_dir;
int nr_entries, i;
char name[16];
regs_dir = debugfs_create_dir(READ_STR, dir);
if (!regs_dir)
return;
nr_entries = ARRAY_SIZE(debugfs_regs);
dw_edma_debugfs_create_x32(debugfs_regs, nr_entries, regs_dir);
if (dw->mode == EDMA_MODE_UNROLL) {
nr_entries = ARRAY_SIZE(debugfs_unroll_regs);
dw_edma_debugfs_create_x32(debugfs_unroll_regs, nr_entries,
regs_dir);
}
for (i = 0; i < dw->rd_ch_cnt; i++) {
snprintf(name, sizeof(name), "%s:%d", CHANNEL_STR, i);
ch_dir = debugfs_create_dir(name, regs_dir);
if (!ch_dir)
return;
dw_edma_debugfs_regs_ch(&regs->type.unroll.ch[i].rd, ch_dir);
lim[1][i].start = &regs->type.unroll.ch[i].rd;
lim[1][i].end = &regs->type.unroll.ch[i].padding_2[0];
}
}
static void dw_edma_debugfs_regs(void)
{
const struct debugfs_entries debugfs_regs[] = {
REGISTER(ctrl_data_arb_prior),
REGISTER(ctrl),
};
struct dentry *regs_dir;
int nr_entries;
regs_dir = debugfs_create_dir(REGISTERS_STR, base_dir);
if (!regs_dir)
return;
nr_entries = ARRAY_SIZE(debugfs_regs);
dw_edma_debugfs_create_x32(debugfs_regs, nr_entries, regs_dir);
dw_edma_debugfs_regs_wr(regs_dir);
dw_edma_debugfs_regs_rd(regs_dir);
}
void dw_edma_v0_debugfs_on(struct dw_edma_chip *chip)
{
dw = chip->dw;
if (!dw)
return;
regs = dw->rg_region.vaddr;
if (!regs)
return;
base_dir = debugfs_create_dir(dw->name, 0);
if (!base_dir)
return;
debugfs_create_u32("version", 0444, base_dir, &dw->version);
debugfs_create_u32("mode", 0444, base_dir, &dw->mode);
debugfs_create_u16("wr_ch_cnt", 0444, base_dir, &dw->wr_ch_cnt);
debugfs_create_u16("rd_ch_cnt", 0444, base_dir, &dw->rd_ch_cnt);
dw_edma_debugfs_regs();
}
void dw_edma_v0_debugfs_off(void)
{
debugfs_remove_recursive(base_dir);
}
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