/* * 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. * * This program is free software; you can redistribute it and/or modify it * under the terms and conditions of the GNU General Public License, * version 2, as published by the Free Software Foundation. * * This program is distributed in the hope it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for * more details. * */ #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;} static int punit_dev_state_open(struct inode *inode, struct file *file){	return single_open(file, punit_dev_state_show, inode->i_private);} static const struct file_operations punit_dev_state_ops = {	.open		= punit_dev_state_open,	.read		= seq_read,	.llseek		= seq_lseek,	.release	= single_release,}; static struct dentry *punit_dbg_file; static int punit_dbgfs_register(struct punit_device *punit_device){	static 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", S_IFREG | S_IRUGO,					punit_dbg_file, punit_device,					&punit_dev_state_ops);	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_SILVERMONT1, punit_device_byt),	ICPU(INTEL_FAM6_ATOM_MERRIFIELD,  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");