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/*
* 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/iosf_mbi.h>
/* Side band Interface port */
#define PUNIT_PORT 0x04
/* Power gate status reg */
#define PWRGT_STATUS 0x61
/* 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
/* 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_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(PUNIT_PORT, BT_MBI_PMC_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(55, punit_device_byt), /* Valleyview, Bay Trail */
ICPU(76, punit_device_cht), /* Braswell, Cherry Trail */
{}
};
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");
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