imx8-isi-debug.c

  1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * Copyright 2019-2020 NXP
  4 */
  5
  6#include <linux/debugfs.h>
  7#include <linux/device.h>
  8#include <linux/io.h>
  9#include <linux/kernel.h>
 10#include <linux/pm_runtime.h>
 11#include <linux/seq_file.h>
 12#include <linux/types.h>
 13
 14#include "imx8-isi-core.h"
 15#include "imx8-isi-regs.h"
 16
 17static inline u32 mxc_isi_read(struct mxc_isi_pipe *pipe, u32 reg)
 18{
 19	return readl(pipe->regs + reg);
 20}
 21
 22static int mxc_isi_debug_dump_regs_show(struct seq_file *m, void *p)
 23{
 24#define MXC_ISI_DEBUG_REG(name)		{ name, #name }
 25	struct debug_regs {
 26		u32 offset;
 27		const char * const name;
 28	};
 29	static const struct debug_regs registers[] = {
 30		MXC_ISI_DEBUG_REG(CHNL_CTRL),
 31		MXC_ISI_DEBUG_REG(CHNL_IMG_CTRL),
 32		MXC_ISI_DEBUG_REG(CHNL_OUT_BUF_CTRL),
 33		MXC_ISI_DEBUG_REG(CHNL_IMG_CFG),
 34		MXC_ISI_DEBUG_REG(CHNL_IER),
 35		MXC_ISI_DEBUG_REG(CHNL_STS),
 36		MXC_ISI_DEBUG_REG(CHNL_SCALE_FACTOR),
 37		MXC_ISI_DEBUG_REG(CHNL_SCALE_OFFSET),
 38		MXC_ISI_DEBUG_REG(CHNL_CROP_ULC),
 39		MXC_ISI_DEBUG_REG(CHNL_CROP_LRC),
 40		MXC_ISI_DEBUG_REG(CHNL_CSC_COEFF0),
 41		MXC_ISI_DEBUG_REG(CHNL_CSC_COEFF1),
 42		MXC_ISI_DEBUG_REG(CHNL_CSC_COEFF2),
 43		MXC_ISI_DEBUG_REG(CHNL_CSC_COEFF3),
 44		MXC_ISI_DEBUG_REG(CHNL_CSC_COEFF4),
 45		MXC_ISI_DEBUG_REG(CHNL_CSC_COEFF5),
 46		MXC_ISI_DEBUG_REG(CHNL_ROI_0_ALPHA),
 47		MXC_ISI_DEBUG_REG(CHNL_ROI_0_ULC),
 48		MXC_ISI_DEBUG_REG(CHNL_ROI_0_LRC),
 49		MXC_ISI_DEBUG_REG(CHNL_ROI_1_ALPHA),
 50		MXC_ISI_DEBUG_REG(CHNL_ROI_1_ULC),
 51		MXC_ISI_DEBUG_REG(CHNL_ROI_1_LRC),
 52		MXC_ISI_DEBUG_REG(CHNL_ROI_2_ALPHA),
 53		MXC_ISI_DEBUG_REG(CHNL_ROI_2_ULC),
 54		MXC_ISI_DEBUG_REG(CHNL_ROI_2_LRC),
 55		MXC_ISI_DEBUG_REG(CHNL_ROI_3_ALPHA),
 56		MXC_ISI_DEBUG_REG(CHNL_ROI_3_ULC),
 57		MXC_ISI_DEBUG_REG(CHNL_ROI_3_LRC),
 58		MXC_ISI_DEBUG_REG(CHNL_OUT_BUF1_ADDR_Y),
 59		MXC_ISI_DEBUG_REG(CHNL_OUT_BUF1_ADDR_U),
 60		MXC_ISI_DEBUG_REG(CHNL_OUT_BUF1_ADDR_V),
 61		MXC_ISI_DEBUG_REG(CHNL_OUT_BUF_PITCH),
 62		MXC_ISI_DEBUG_REG(CHNL_IN_BUF_ADDR),
 63		MXC_ISI_DEBUG_REG(CHNL_IN_BUF_PITCH),
 64		MXC_ISI_DEBUG_REG(CHNL_MEM_RD_CTRL),
 65		MXC_ISI_DEBUG_REG(CHNL_OUT_BUF2_ADDR_Y),
 66		MXC_ISI_DEBUG_REG(CHNL_OUT_BUF2_ADDR_U),
 67		MXC_ISI_DEBUG_REG(CHNL_OUT_BUF2_ADDR_V),
 68		MXC_ISI_DEBUG_REG(CHNL_SCL_IMG_CFG),
 69		MXC_ISI_DEBUG_REG(CHNL_FLOW_CTRL),
 70	};
 71	/* These registers contain the upper 4 bits of 36-bit DMA addresses. */
 72	static const struct debug_regs registers_36bit_dma[] = {
 73		MXC_ISI_DEBUG_REG(CHNL_Y_BUF1_XTND_ADDR),
 74		MXC_ISI_DEBUG_REG(CHNL_U_BUF1_XTND_ADDR),
 75		MXC_ISI_DEBUG_REG(CHNL_V_BUF1_XTND_ADDR),
 76		MXC_ISI_DEBUG_REG(CHNL_Y_BUF2_XTND_ADDR),
 77		MXC_ISI_DEBUG_REG(CHNL_U_BUF2_XTND_ADDR),
 78		MXC_ISI_DEBUG_REG(CHNL_V_BUF2_XTND_ADDR),
 79		MXC_ISI_DEBUG_REG(CHNL_IN_BUF_XTND_ADDR),
 80	};
 81
 82	struct mxc_isi_pipe *pipe = m->private;
 83	unsigned int i;
 84
 85	if (!pm_runtime_get_if_in_use(pipe->isi->dev))
 86		return 0;
 87
 88	seq_printf(m, "--- ISI pipe %u registers ---\n", pipe->id);
 89
 90	for (i = 0; i < ARRAY_SIZE(registers); ++i)
 91		seq_printf(m, "%21s[0x%02x]: 0x%08x\n",
 92			   registers[i].name, registers[i].offset,
 93			   mxc_isi_read(pipe, registers[i].offset));
 94
 95	if (pipe->isi->pdata->has_36bit_dma) {
 96		for (i = 0; i < ARRAY_SIZE(registers_36bit_dma); ++i) {
 97			const struct debug_regs *reg = &registers_36bit_dma[i];
 98
 99			seq_printf(m, "%21s[0x%02x]: 0x%08x\n",
100				   reg->name, reg->offset,
101				   mxc_isi_read(pipe, reg->offset));
102		}
103	}
104
105	pm_runtime_put(pipe->isi->dev);
106
107	return 0;
108}
109DEFINE_SHOW_ATTRIBUTE(mxc_isi_debug_dump_regs);
110
111void mxc_isi_debug_init(struct mxc_isi_dev *isi)
112{
113	unsigned int i;
114
115	isi->debugfs_root = debugfs_create_dir(dev_name(isi->dev), NULL);
116
117	for (i = 0; i < isi->pdata->num_channels; ++i) {
118		struct mxc_isi_pipe *pipe = &isi->pipes[i];
119		char name[8];
120
121		sprintf(name, "pipe%u", pipe->id);
122		debugfs_create_file(name, 0444, isi->debugfs_root, pipe,
123				    &mxc_isi_debug_dump_regs_fops);
124	}
125}
126
127void mxc_isi_debug_cleanup(struct mxc_isi_dev *isi)
128{
129	debugfs_remove_recursive(isi->debugfs_root);
130}