[mirror_ubuntu-jammy-kernel.git] / arch / x86 / platform / atom / punit_atom_debug.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Intel SOC Punit device state debug driver
 * Punit controls power management for North Complex devices (Graphics
 * blocks, Image Signal Processing, video processing, display, DSP etc.)
 *
 * Copyright (c) 2015, Intel Corporation.
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include <linux/io.h>
#include <asm/cpu_device_id.h>
#include <asm/intel-family.h>
#include <asm/iosf_mbi.h>

/* Subsystem config/status Video processor */
#define VED_SS_PM0		0x32
/* Subsystem config/status ISP (Image Signal Processor) */
#define ISP_SS_PM0		0x39
/* Subsystem config/status Input/output controller */
#define MIO_SS_PM		0x3B
/* Shift bits for getting status for video, isp and i/o */
#define SSS_SHIFT		24

/* Power gate status reg */
#define PWRGT_STATUS		0x61
/* Shift bits for getting status for graphics rendering */
#define RENDER_POS		0
/* Shift bits for getting status for media control */
#define MEDIA_POS		2
/* Shift bits for getting status for Valley View/Baytrail display */
#define VLV_DISPLAY_POS		6

/* Subsystem config/status display for Cherry Trail SOC */
#define CHT_DSP_SSS		0x36
/* Shift bits for getting status for display */
#define CHT_DSP_SSS_POS		16

struct punit_device {
	char *name;
	int reg;
	int sss_pos;
};

static const struct punit_device punit_device_tng[] = {
	{ "DISPLAY",	CHT_DSP_SSS,	SSS_SHIFT },
	{ "VED",	VED_SS_PM0,	SSS_SHIFT },
	{ "ISP",	ISP_SS_PM0,	SSS_SHIFT },
	{ "MIO",	MIO_SS_PM,	SSS_SHIFT },
	{ NULL }
};

static const struct punit_device punit_device_byt[] = {
	{ "GFX RENDER",	PWRGT_STATUS,	RENDER_POS },
	{ "GFX MEDIA",	PWRGT_STATUS,	MEDIA_POS },
	{ "DISPLAY",	PWRGT_STATUS,	VLV_DISPLAY_POS },
	{ "VED",	VED_SS_PM0,	SSS_SHIFT },
	{ "ISP",	ISP_SS_PM0,	SSS_SHIFT },
	{ "MIO",	MIO_SS_PM,	SSS_SHIFT },
	{ NULL }
};

static const struct punit_device punit_device_cht[] = {
	{ "GFX RENDER",	PWRGT_STATUS,	RENDER_POS },
	{ "GFX MEDIA",	PWRGT_STATUS,	MEDIA_POS },
	{ "DISPLAY",	CHT_DSP_SSS,	CHT_DSP_SSS_POS },
	{ "VED",	VED_SS_PM0,	SSS_SHIFT },
	{ "ISP",	ISP_SS_PM0,	SSS_SHIFT },
	{ "MIO",	MIO_SS_PM,	SSS_SHIFT },
	{ NULL }
};

static const char * const dstates[] = {"D0", "D0i1", "D0i2", "D0i3"};

static int punit_dev_state_show(struct seq_file *seq_file, void *unused)
{
	u32 punit_pwr_status;
	struct punit_device *punit_devp = seq_file->private;
	int index;
	int status;

	seq_puts(seq_file, "\n\nPUNIT NORTH COMPLEX DEVICES :\n");
	while (punit_devp->name) {
		status = iosf_mbi_read(BT_MBI_UNIT_PMC, MBI_REG_READ,
				       punit_devp->reg, &punit_pwr_status);
		if (status) {
			seq_printf(seq_file, "%9s : Read Failed\n",
				   punit_devp->name);
		} else  {
			index = (punit_pwr_status >> punit_devp->sss_pos) & 3;
			seq_printf(seq_file, "%9s : %s\n", punit_devp->name,
				   dstates[index]);
		}
		punit_devp++;
	}

	return 0;
}
DEFINE_SHOW_ATTRIBUTE(punit_dev_state);

static struct dentry *punit_dbg_file;

static int punit_dbgfs_register(struct punit_device *punit_device)
{
	struct dentry *dev_state;

	punit_dbg_file = debugfs_create_dir("punit_atom", NULL);
	if (!punit_dbg_file)
		return -ENXIO;

	dev_state = debugfs_create_file("dev_power_state", 0444,
					punit_dbg_file, punit_device,
					&punit_dev_state_fops);
	if (!dev_state) {
		pr_err("punit_dev_state register failed\n");
		debugfs_remove(punit_dbg_file);
		return -ENXIO;
	}

	return 0;
}

static void punit_dbgfs_unregister(void)
{
	debugfs_remove_recursive(punit_dbg_file);
}

#define ICPU(model, drv_data) \
	{ X86_VENDOR_INTEL, 6, model, X86_FEATURE_MWAIT,\
	  (kernel_ulong_t)&drv_data }

static const struct x86_cpu_id intel_punit_cpu_ids[] = {
	ICPU(INTEL_FAM6_ATOM_SILVERMONT, punit_device_byt),
	ICPU(INTEL_FAM6_ATOM_SILVERMONT_MID,  punit_device_tng),
	ICPU(INTEL_FAM6_ATOM_AIRMONT,	  punit_device_cht),
	{}
};

MODULE_DEVICE_TABLE(x86cpu, intel_punit_cpu_ids);

static int __init punit_atom_debug_init(void)
{
	const struct x86_cpu_id *id;
	int ret;

	id = x86_match_cpu(intel_punit_cpu_ids);
	if (!id)
		return -ENODEV;

	ret = punit_dbgfs_register((struct punit_device *)id->driver_data);
	if (ret < 0)
		return ret;

	return 0;
}

static void __exit punit_atom_debug_exit(void)
{
	punit_dbgfs_unregister();
}

module_init(punit_atom_debug_init);
module_exit(punit_atom_debug_exit);

MODULE_AUTHOR("Kumar P, Mahesh <mahesh.kumar.p@intel.com>");
MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>");
MODULE_DESCRIPTION("Driver for Punit devices states debugging");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
2025cf9e	1	// SPDX-License-Identifier: GPL-2.0-only
956079e0 SP	2	/*
	3	* Intel SOC Punit device state debug driver
	4	* Punit controls power management for North Complex devices (Graphics
	5	* blocks, Image Signal Processing, video processing, display, DSP etc.)
	6	*
	7	* Copyright (c) 2015, Intel Corporation.
956079e0 SP	8	*/
	9
	10	#include <linux/module.h>
	11	#include <linux/init.h>
	12	#include <linux/device.h>
	13	#include <linux/debugfs.h>
	14	#include <linux/seq_file.h>
	15	#include <linux/io.h>
	16	#include <asm/cpu_device_id.h>
d5e0c89a	17	#include <asm/intel-family.h>
956079e0 SP	18	#include <asm/iosf_mbi.h>
956079e0 SP	19
956079e0 SP	20	/* Subsystem config/status Video processor */
	21	#define VED_SS_PM0 0x32
	22	/* Subsystem config/status ISP (Image Signal Processor) */
	23	#define ISP_SS_PM0 0x39
	24	/* Subsystem config/status Input/output controller */
	25	#define MIO_SS_PM 0x3B
	26	/* Shift bits for getting status for video, isp and i/o */
	27	#define SSS_SHIFT 24
9485f8b6 AS	28
	29	/* Power gate status reg */
	30	#define PWRGT_STATUS 0x61
956079e0 SP	31	/* Shift bits for getting status for graphics rendering */
	32	#define RENDER_POS 0
	33	/* Shift bits for getting status for media control */
	34	#define MEDIA_POS 2
	35	/* Shift bits for getting status for Valley View/Baytrail display */
	36	#define VLV_DISPLAY_POS 6
9485f8b6	37
956079e0 SP	38	/* Subsystem config/status display for Cherry Trail SOC */
	39	#define CHT_DSP_SSS 0x36
	40	/* Shift bits for getting status for display */
	41	#define CHT_DSP_SSS_POS 16
	42
	43	struct punit_device {
	44	char *name;
	45	int reg;
	46	int sss_pos;
	47	};
	48
9485f8b6 AS	49	static const struct punit_device punit_device_tng[] = {
	50	{ "DISPLAY", CHT_DSP_SSS, SSS_SHIFT },
	51	{ "VED", VED_SS_PM0, SSS_SHIFT },
	52	{ "ISP", ISP_SS_PM0, SSS_SHIFT },
	53	{ "MIO", MIO_SS_PM, SSS_SHIFT },
	54	{ NULL }
	55	};
	56
956079e0 SP	57	static const struct punit_device punit_device_byt[] = {
	58	{ "GFX RENDER", PWRGT_STATUS, RENDER_POS },
	59	{ "GFX MEDIA", PWRGT_STATUS, MEDIA_POS },
	60	{ "DISPLAY", PWRGT_STATUS, VLV_DISPLAY_POS },
	61	{ "VED", VED_SS_PM0, SSS_SHIFT },
	62	{ "ISP", ISP_SS_PM0, SSS_SHIFT },
	63	{ "MIO", MIO_SS_PM, SSS_SHIFT },
	64	{ NULL }
	65	};
	66
	67	static const struct punit_device punit_device_cht[] = {
	68	{ "GFX RENDER", PWRGT_STATUS, RENDER_POS },
	69	{ "GFX MEDIA", PWRGT_STATUS, MEDIA_POS },
	70	{ "DISPLAY", CHT_DSP_SSS, CHT_DSP_SSS_POS },
	71	{ "VED", VED_SS_PM0, SSS_SHIFT },
	72	{ "ISP", ISP_SS_PM0, SSS_SHIFT },
	73	{ "MIO", MIO_SS_PM, SSS_SHIFT },
	74	{ NULL }
	75	};
	76
	77	static const char * const dstates[] = {"D0", "D0i1", "D0i2", "D0i3"};
	78
	79	static int punit_dev_state_show(struct seq_file seq_file, void unused)
	80	{
	81	u32 punit_pwr_status;
	82	struct punit_device *punit_devp = seq_file->private;
	83	int index;
	84	int status;
	85
	86	seq_puts(seq_file, "\n\nPUNIT NORTH COMPLEX DEVICES :\n");
	87	while (punit_devp->name) {
4077a387 AS	88	status = iosf_mbi_read(BT_MBI_UNIT_PMC, MBI_REG_READ,
4077a387 AS	89	punit_devp->reg, &punit_pwr_status);
956079e0 SP	90	if (status) {
	91	seq_printf(seq_file, "%9s : Read Failed\n",
	92	punit_devp->name);
	93	} else {
	94	index = (punit_pwr_status >> punit_devp->sss_pos) & 3;
	95	seq_printf(seq_file, "%9s : %s\n", punit_devp->name,
	96	dstates[index]);
	97	}
	98	punit_devp++;
	99	}
	100
	101	return 0;
	102	}
3130451e	103	DEFINE_SHOW_ATTRIBUTE(punit_dev_state);
956079e0 SP	104
	105	static struct dentry *punit_dbg_file;
	106
	107	static int punit_dbgfs_register(struct punit_device *punit_device)
	108	{
f703fd37	109	struct dentry *dev_state;
956079e0 SP	110
	111	punit_dbg_file = debugfs_create_dir("punit_atom", NULL);
	112	if (!punit_dbg_file)
	113	return -ENXIO;
	114
3130451e	115	dev_state = debugfs_create_file("dev_power_state", 0444,
956079e0	116	punit_dbg_file, punit_device,
3130451e	117	&punit_dev_state_fops);
956079e0 SP	118	if (!dev_state) {
	119	pr_err("punit_dev_state register failed\n");
	120	debugfs_remove(punit_dbg_file);
	121	return -ENXIO;
	122	}
	123
	124	return 0;
	125	}
	126
	127	static void punit_dbgfs_unregister(void)
	128	{
	129	debugfs_remove_recursive(punit_dbg_file);
	130	}
	131
	132	#define ICPU(model, drv_data) \
	133	{ X86_VENDOR_INTEL, 6, model, X86_FEATURE_MWAIT,\
	134	(kernel_ulong_t)&drv_data }
	135
	136	static const struct x86_cpu_id intel_punit_cpu_ids[] = {
f2c4db1b PZ	137	ICPU(INTEL_FAM6_ATOM_SILVERMONT, punit_device_byt),
f2c4db1b PZ	138	ICPU(INTEL_FAM6_ATOM_SILVERMONT_MID, punit_device_tng),
d5e0c89a	139	ICPU(INTEL_FAM6_ATOM_AIRMONT, punit_device_cht),
956079e0 SP	140	{}
	141	};
	142
	143	MODULE_DEVICE_TABLE(x86cpu, intel_punit_cpu_ids);
	144
	145	static int __init punit_atom_debug_init(void)
	146	{
	147	const struct x86_cpu_id *id;
	148	int ret;
	149
	150	id = x86_match_cpu(intel_punit_cpu_ids);
	151	if (!id)
	152	return -ENODEV;
	153
	154	ret = punit_dbgfs_register((struct punit_device *)id->driver_data);
	155	if (ret < 0)
	156	return ret;
	157
	158	return 0;
	159	}
	160
	161	static void __exit punit_atom_debug_exit(void)
	162	{
	163	punit_dbgfs_unregister();
	164	}
	165
	166	module_init(punit_atom_debug_init);
	167	module_exit(punit_atom_debug_exit);
	168
	169	MODULE_AUTHOR("Kumar P, Mahesh <mahesh.kumar.p@intel.com>");
	170	MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>");
	171	MODULE_DESCRIPTION("Driver for Punit devices states debugging");
	172	MODULE_LICENSE("GPL v2");