// SPDX-License-Identifier: GPL-2.0-only
// Copyright(c) 2017-2019 Intel Corporation.
#include <linux/cleanup.h>
#include <linux/device.h>
#include <linux/debugfs.h>
#include <linux/firmware.h>
#include <linux/mod_devicetable.h>
#include <linux/pm_runtime.h>
#include <linux/slab.h>
#include <linux/soundwire/sdw.h>
#include <linux/soundwire/sdw_registers.h>
#include "bus.h"
static struct dentry *sdw_debugfs_root;
void sdw_bus_debugfs_init(struct sdw_bus *bus)
{
char name[16];
if (!sdw_debugfs_root)
return;
/* create the debugfs master-N */
snprintf(name, sizeof(name), "master-%d-%d", bus->controller_id, bus->link_id);
bus->debugfs = debugfs_create_dir(name, sdw_debugfs_root);
}
void sdw_bus_debugfs_exit(struct sdw_bus *bus)
{
debugfs_remove_recursive(bus->debugfs);
}
#define RD_BUF (3 * PAGE_SIZE)
static ssize_t sdw_sprintf(struct sdw_slave *slave,
char *buf, size_t pos, unsigned int reg)
{
int value;
value = sdw_read_no_pm(slave, reg);
if (value < 0)
return scnprintf(buf + pos, RD_BUF - pos, "%3x\tXX\n", reg);
else
return scnprintf(buf + pos, RD_BUF - pos,
"%3x\t%2x\n", reg, value);
}
static int sdw_slave_reg_show(struct seq_file *s_file, void *data)
{
struct sdw_slave *slave = s_file->private;
ssize_t ret;
int i, j;
char *buf __free(kfree) = kzalloc(RD_BUF, GFP_KERNEL);
if (!buf)
return -ENOMEM;
ret = pm_runtime_get_sync(&slave->dev);
if (ret < 0 && ret != -EACCES) {
pm_runtime_put_noidle(&slave->dev);
return ret;
}
ret = scnprintf(buf, RD_BUF, "Register Value\n");
/* DP0 non-banked registers */
ret += scnprintf(buf + ret, RD_BUF - ret, "\nDP0\n");
for (i = SDW_DP0_INT; i <= SDW_DP0_PREPARECTRL; i++)
ret += sdw_sprintf(slave, buf, ret, i);
/* DP0 Bank 0 registers */
ret += scnprintf(buf + ret, RD_BUF - ret, "Bank0\n");
ret += sdw_sprintf(slave, buf, ret, SDW_DP0_CHANNELEN);
for (i = SDW_DP0_SAMPLECTRL1; i <= SDW_DP0_LANECTRL; i++)
ret += sdw_sprintf(slave, buf, ret, i);
/* DP0 Bank 1 registers */
ret += scnprintf(buf + ret, RD_BUF - ret, "Bank1\n");
ret += sdw_sprintf(slave, buf, ret,
SDW_DP0_CHANNELEN + SDW_BANK1_OFFSET);
for (i = SDW_DP0_SAMPLECTRL1 + SDW_BANK1_OFFSET;
i <= SDW_DP0_LANECTRL + SDW_BANK1_OFFSET; i++)
ret += sdw_sprintf(slave, buf, ret, i);
/* SCP registers */
ret += scnprintf(buf + ret, RD_BUF - ret, "\nSCP\n");
for (i = SDW_SCP_INT1; i <= SDW_SCP_BUS_CLOCK_BASE; i++)
ret += sdw_sprintf(slave, buf, ret, i);
for (i = SDW_SCP_DEVID_0; i <= SDW_SCP_DEVID_5; i++)
ret += sdw_sprintf(slave, buf, ret, i);
for (i = SDW_SCP_FRAMECTRL_B0; i <= SDW_SCP_BUSCLOCK_SCALE_B0; i++)
ret += sdw_sprintf(slave, buf, ret, i);
for (i = SDW_SCP_FRAMECTRL_B1; i <= SDW_SCP_BUSCLOCK_SCALE_B1; i++)
ret += sdw_sprintf(slave, buf, ret, i);
for (i = SDW_SCP_PHY_OUT_CTRL_0; i <= SDW_SCP_PHY_OUT_CTRL_7; i++)
ret += sdw_sprintf(slave, buf, ret, i);
/*
* SCP Bank 0/1 registers are read-only and cannot be
* retrieved from the Slave. The Master typically keeps track
* of the current frame size so the information can be found
* in other places
*/
/* DP1..14 registers */
for (i = 1; SDW_VALID_PORT_RANGE(i); i++) {
/* DPi registers */
ret += scnprintf(buf + ret, RD_BUF - ret, "\nDP%d\n", i);
for (j = SDW_DPN_INT(i); j <= SDW_DPN_PREPARECTRL(i); j++)
ret += sdw_sprintf(slave, buf, ret, j);
/* DPi Bank0 registers */
ret += scnprintf(buf + ret, RD_BUF - ret, "Bank0\n");
for (j = SDW_DPN_CHANNELEN_B0(i);
j <= SDW_DPN_LANECTRL_B0(i); j++)
ret += sdw_sprintf(slave, buf, ret, j);
/* DPi Bank1 registers */
ret += scnprintf(buf + ret, RD_BUF - ret, "Bank1\n");
for (j = SDW_DPN_CHANNELEN_B1(i);
j <= SDW_DPN_LANECTRL_B1(i); j++)
ret += sdw_sprintf(slave, buf, ret, j);
}
seq_printf(s_file, "%s", buf);
pm_runtime_mark_last_busy(&slave->dev);
pm_runtime_put(&slave->dev);
return 0;
}
DEFINE_SHOW_ATTRIBUTE(sdw_slave_reg);
#define MAX_CMD_BYTES 256
static int cmd;
static u32 start_addr;
static size_t num_bytes;
static u8 read_buffer[MAX_CMD_BYTES];
static char *firmware_file;
static int set_command(void *data, u64 value)
{
struct sdw_slave *slave = data;
if (value > 1)
return -EINVAL;
/* Userspace changed the hardware state behind the kernel's back */
add_taint(TAINT_USER, LOCKDEP_STILL_OK);
dev_dbg(&slave->dev, "command: %s\n", value ? "read" : "write");
cmd = value;
return 0;
}
DEFINE_DEBUGFS_ATTRIBUTE(set_command_fops, NULL,
set_command, "%llu\n");
static int set_start_address(void *data, u64 value)
{
struct sdw_slave *slave = data;
/* Userspace changed the hardware state behind the kernel's back */
add_taint(TAINT_USER, LOCKDEP_STILL_OK);
dev_dbg(&slave->dev, "start address %#llx\n", value);
start_addr = value;
return 0;
}
DEFINE_DEBUGFS_ATTRIBUTE(set_start_address_fops, NULL,
set_start_address, "%llu\n");
static int set_num_bytes(void *data, u64 value)
{
struct sdw_slave *slave = data;
if (value == 0 || value > MAX_CMD_BYTES)
return -EINVAL;
/* Userspace changed the hardware state behind the kernel's back */
add_taint(TAINT_USER, LOCKDEP_STILL_OK);
dev_dbg(&slave->dev, "number of bytes %lld\n", value);
num_bytes = value;
return 0;
}
DEFINE_DEBUGFS_ATTRIBUTE(set_num_bytes_fops, NULL,
set_num_bytes, "%llu\n");
static int cmd_go(void *data, u64 value)
{
struct sdw_slave *slave = data;
int ret;
if (value != 1)
return -EINVAL;
/* one last check */
if (start_addr > SDW_REG_MAX ||
num_bytes == 0 || num_bytes > MAX_CMD_BYTES)
return -EINVAL;
ret = pm_runtime_get_sync(&slave->dev);
if (ret < 0 && ret != -EACCES) {
pm_runtime_put_noidle(&slave->dev);
return ret;
}
/* Userspace changed the hardware state behind the kernel's back */
add_taint(TAINT_USER, LOCKDEP_STILL_OK);
dev_dbg(&slave->dev, "starting command\n");
if (cmd == 0) {
const struct firmware *fw;
ret = request_firmware(&fw, firmware_file, &slave->dev);
if (ret < 0) {
dev_err(&slave->dev, "firmware %s not found\n", firmware_file);
goto out;
}
if (fw->size != num_bytes) {
dev_err(&slave->dev,
"firmware %s: unexpected size %zd, desired %zd\n",
firmware_file, fw->size, num_bytes);
release_firmware(fw);
goto out;
}
ret = sdw_nwrite_no_pm(slave, start_addr, num_bytes, fw->data);
release_firmware(fw);
} else {
ret = sdw_nread_no_pm(slave, start_addr, num_bytes, read_buffer);
}
dev_dbg(&slave->dev, "command completed %d\n", ret);
out:
pm_runtime_mark_last_busy(&slave->dev);
pm_runtime_put(&slave->dev);
return ret;
}
DEFINE_DEBUGFS_ATTRIBUTE(cmd_go_fops, NULL,
cmd_go, "%llu\n");
#define MAX_LINE_LEN 128
static int read_buffer_show(struct seq_file *s_file, void *data)
{
char buf[MAX_LINE_LEN];
int i;
if (num_bytes == 0 || num_bytes > MAX_CMD_BYTES)
return -EINVAL;
for (i = 0; i < num_bytes; i++) {
scnprintf(buf, MAX_LINE_LEN, "address %#x val 0x%02x\n",
start_addr + i, read_buffer[i]);
seq_printf(s_file, "%s", buf);
}
return 0;
}
DEFINE_SHOW_ATTRIBUTE(read_buffer);
void sdw_slave_debugfs_init(struct sdw_slave *slave)
{
struct dentry *master;
struct dentry *d;
char name[32];
master = slave->bus->debugfs;
/* create the debugfs slave-name */
snprintf(name, sizeof(name), "%s", dev_name(&slave->dev));
d = debugfs_create_dir(name, master);
debugfs_create_file("registers", 0400, d, slave, &sdw_slave_reg_fops);
/* interface to send arbitrary commands */
debugfs_create_file("command", 0200, d, slave, &set_command_fops);
debugfs_create_file("start_address", 0200, d, slave, &set_start_address_fops);
debugfs_create_file("num_bytes", 0200, d, slave, &set_num_bytes_fops);
debugfs_create_file("go", 0200, d, slave, &cmd_go_fops);
debugfs_create_file("read_buffer", 0400, d, slave, &read_buffer_fops);
firmware_file = NULL;
debugfs_create_str("firmware_file", 0200, d, &firmware_file);
slave->debugfs = d;
}
void sdw_slave_debugfs_exit(struct sdw_slave *slave)
{
debugfs_remove_recursive(slave->debugfs);
}
void sdw_debugfs_init(void)
{
sdw_debugfs_root = debugfs_create_dir("soundwire", NULL);
}
void sdw_debugfs_exit(void)
{
debugfs_remove_recursive(sdw_debugfs_root);
}