[PATCH 10/20] soundwire: intel_ace2x: add debugfs support

Bard Liao
2023-03-23T05:31:25Z

Add access to registers in SHIM and SHIM_VS (vendor-specific) areas.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Rander Wang <rander.wang@intel.com>
Reviewed-by: Péter Ujfalusi <peter.ujfalusi@linux.intel.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
---
drivers/soundwire/Makefile | 3 +-
drivers/soundwire/intel.h | 8 ++
drivers/soundwire/intel_ace2x.c | 2 +
drivers/soundwire/intel_ace2x_debugfs.c | 147 ++++++++++++++++++++++++
4 files changed, 159 insertions(+), 1 deletion(-)
create mode 100644 drivers/soundwire/intel_ace2x_debugfs.c

diff --git a/drivers/soundwire/Makefile b/drivers/soundwire/Makefile
index d7212777a927..c57571c82e04 100644
--- a/drivers/soundwire/Makefile
+++ b/drivers/soundwire/Makefile
@@ -20,7 +20,8 @@ soundwire-cadence-y := cadence_master.o
obj-$(CONFIG_SOUNDWIRE_CADENCE) += soundwire-cadence.o

#Intel driver
-soundwire-intel-y := intel.o intel_ace2x.o intel_auxdevice.o intel_init.o dmi-quirks.o \
+soundwire-intel-y := intel.o intel_ace2x.o intel_ace2x_debugfs.o \
+ intel_auxdevice.o intel_init.o dmi-quirks.o \
intel_bus_common.o
obj-$(CONFIG_SOUNDWIRE_INTEL) += soundwire-intel.o

diff --git a/drivers/soundwire/intel.h b/drivers/soundwire/intel.h
index cf9db4906de4..511932c55216 100644
--- a/drivers/soundwire/intel.h
+++ b/drivers/soundwire/intel.h
@@ -95,6 +95,14 @@ static inline void intel_writew(void __iomem *base, int offset, u16 value)
(sdw)->link_res->hw_ops->cb)
#define SDW_INTEL_OPS(sdw, cb) ((sdw)->link_res->hw_ops->cb)

+#ifdef CONFIG_DEBUG_FS
+void intel_ace2x_debugfs_init(struct sdw_intel *sdw);
+void intel_ace2x_debugfs_exit(struct sdw_intel *sdw);
+#else
+static inline void intel_ace2x_debugfs_init(struct sdw_intel *sdw) {}
+static inline void intel_ace2x_debugfs_exit(struct sdw_intel *sdw) {}
+#endif
+
static inline void sdw_intel_debugfs_init(struct sdw_intel *sdw)
{
if (SDW_INTEL_CHECK_OPS(sdw, debugfs_init))
diff --git a/drivers/soundwire/intel_ace2x.c b/drivers/soundwire/intel_ace2x.c
index 623e4fd7db91..1c47bb2adb93 100644
--- a/drivers/soundwire/intel_ace2x.c
+++ b/drivers/soundwire/intel_ace2x.c
@@ -15,5 +15,7 @@
#include "intel.h"

const struct sdw_intel_hw_ops sdw_intel_lnl_hw_ops = {
+ .debugfs_init = intel_ace2x_debugfs_init,
+ .debugfs_exit = intel_ace2x_debugfs_exit,
};
EXPORT_SYMBOL_NS(sdw_intel_lnl_hw_ops, SOUNDWIRE_INTEL);
diff --git a/drivers/soundwire/intel_ace2x_debugfs.c b/drivers/soundwire/intel_ace2x_debugfs.c
new file mode 100644
index 000000000000..3d24661ffd37
--- /dev/null
+++ b/drivers/soundwire/intel_ace2x_debugfs.c
@@ -0,0 +1,147 @@
+// SPDX-License-Identifier: GPL-2.0-only
+// Copyright(c) 2023 Intel Corporation. All rights reserved.
+
+#include <linux/acpi.h>
+#include <linux/debugfs.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/io.h>
+#include <linux/pm_runtime.h>
+#include <linux/soundwire/sdw.h>
+#include <linux/soundwire/sdw_intel.h>
+#include <linux/soundwire/sdw_registers.h>
+#include "bus.h"
+#include "cadence_master.h"
+#include "intel.h"
+
+/*
+ * debugfs
+ */
+#ifdef CONFIG_DEBUG_FS
+
+#define RD_BUF (2 * PAGE_SIZE)
+
+static ssize_t intel_sprintf(void __iomem *mem, bool l,
+ char *buf, size_t pos, unsigned int reg)
+{
+ int value;
+
+ if (l)
+ value = intel_readl(mem, reg);
+ else
+ value = intel_readw(mem, reg);
+
+ return scnprintf(buf + pos, RD_BUF - pos, "%4x\t%4x\n", reg, value);
+}
+
+static int intel_reg_show(struct seq_file *s_file, void *data)
+{
+ struct sdw_intel *sdw = s_file->private;
+ void __iomem *s = sdw->link_res->shim;
+ void __iomem *vs_s = sdw->link_res->shim_vs;
+ ssize_t ret;
+ u32 pcm_cap;
+ int pcm_bd;
+ char *buf;
+ int j;
+
+ buf = kzalloc(RD_BUF, GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+
+ ret = scnprintf(buf, RD_BUF, "Register Value\n");
+ ret += scnprintf(buf + ret, RD_BUF - ret, "\nShim\n");
+
+ ret += intel_sprintf(s, true, buf, ret, SDW_SHIM2_LECAP);
+ ret += intel_sprintf(s, false, buf, ret, SDW_SHIM2_PCMSCAP);
+
+ pcm_cap = intel_readw(s, SDW_SHIM2_PCMSCAP);
+ pcm_bd = FIELD_GET(SDW_SHIM2_PCMSCAP_BSS, pcm_cap);
+
+ for (j = 0; j < pcm_bd; j++) {
+ ret += intel_sprintf(s, false, buf, ret,
+ SDW_SHIM2_PCMSYCHM(j));
+ ret += intel_sprintf(s, false, buf, ret,
+ SDW_SHIM2_PCMSYCHC(j));
+ }
+
+ ret += scnprintf(buf + ret, RD_BUF - ret, "\nVS CLK controls\n");
+ ret += intel_sprintf(vs_s, true, buf, ret, SDW_SHIM2_INTEL_VS_LVSCTL);
+
+ ret += scnprintf(buf + ret, RD_BUF - ret, "\nVS Wake registers\n");
+ ret += intel_sprintf(vs_s, false, buf, ret, SDW_SHIM2_INTEL_VS_WAKEEN);
+ ret += intel_sprintf(vs_s, false, buf, ret, SDW_SHIM2_INTEL_VS_WAKESTS);
+
+ ret += scnprintf(buf + ret, RD_BUF - ret, "\nVS IOCTL, ACTMCTL\n");
+ ret += intel_sprintf(vs_s, false, buf, ret, SDW_SHIM2_INTEL_VS_IOCTL);
+ ret += intel_sprintf(vs_s, false, buf, ret, SDW_SHIM2_INTEL_VS_ACTMCTL);
+
+ seq_printf(s_file, "%s", buf);
+ kfree(buf);
+
+ return 0;
+}
+DEFINE_SHOW_ATTRIBUTE(intel_reg);
+
+static int intel_set_m_datamode(void *data, u64 value)
+{
+ struct sdw_intel *sdw = data;
+ struct sdw_bus *bus = &sdw->cdns.bus;
+
+ if (value > SDW_PORT_DATA_MODE_STATIC_1)
+ return -EINVAL;
+
+ /* Userspace changed the hardware state behind the kernel's back */
+ add_taint(TAINT_USER, LOCKDEP_STILL_OK);
+
+ bus->params.m_data_mode = value;
+
+ return 0;
+}
+DEFINE_DEBUGFS_ATTRIBUTE(intel_set_m_datamode_fops, NULL,
+ intel_set_m_datamode, "%llu\n");
+
+static int intel_set_s_datamode(void *data, u64 value)
+{
+ struct sdw_intel *sdw = data;
+ struct sdw_bus *bus = &sdw->cdns.bus;
+
+ if (value > SDW_PORT_DATA_MODE_STATIC_1)
+ return -EINVAL;
+
+ /* Userspace changed the hardware state behind the kernel's back */
+ add_taint(TAINT_USER, LOCKDEP_STILL_OK);
+
+ bus->params.s_data_mode = value;
+
+ return 0;
+}
+DEFINE_DEBUGFS_ATTRIBUTE(intel_set_s_datamode_fops, NULL,
+ intel_set_s_datamode, "%llu\n");
+
+void intel_ace2x_debugfs_init(struct sdw_intel *sdw)
+{
+ struct dentry *root = sdw->cdns.bus.debugfs;
+
+ if (!root)
+ return;
+
+ sdw->debugfs = debugfs_create_dir("intel-sdw", root);
+
+ debugfs_create_file("intel-registers", 0400, sdw->debugfs, sdw,
+ &intel_reg_fops);
+
+ debugfs_create_file("intel-m-datamode", 0200, sdw->debugfs, sdw,
+ &intel_set_m_datamode_fops);
+
+ debugfs_create_file("intel-s-datamode", 0200, sdw->debugfs, sdw,
+ &intel_set_s_datamode_fops);
+
+ sdw_cdns_debugfs_init(&sdw->cdns, sdw->debugfs);
+}
+
+void intel_ace2x_debugfs_exit(struct sdw_intel *sdw)
+{
+ debugfs_remove_recursive(sdw->debugfs);
+}
+#endif /* CONFIG_DEBUG_FS */
--
2.25.1