tools: Add intel_iosf_sb_{read,write} tools

Add generic tools to poke at IOSF sideband. The user needs to
manually specify SB port as well as the register.

TODO: Maybe add symbolic names for the units? Would avoid having
to trawl the docs for the magic hex value.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>

lib/intel_io.h

@@ -50,6 +50,8 @@ uint32_t intel_dpio_reg_read(uint32_t reg, int phy);
 void intel_dpio_reg_write(uint32_t reg, uint32_t val, int phy);
 uint32_t intel_flisdsi_reg_read(uint32_t reg);
 void intel_flisdsi_reg_write(uint32_t reg, uint32_t val);
+uint32_t intel_iosf_sb_read(uint32_t port, uint32_t reg);
+void intel_iosf_sb_write(uint32_t port, uint32_t reg, uint32_t val);
 
 int intel_punit_read(uint8_t addr, uint32_t *val);
 int intel_punit_write(uint8_t addr, uint32_t val);

lib/intel_iosf.c

@@ -173,3 +173,17 @@ void intel_flisdsi_reg_write(uint32_t reg, uint32_t val)
 {
 	vlv_sideband_rw(IOSF_PORT_FLISDSI, SB_CRWRDA_NP, reg, &val);
 }
+
+uint32_t intel_iosf_sb_read(uint32_t port, uint32_t reg)
+{
+	uint32_t val;
+
+	vlv_sideband_rw(port, SB_CRRDDA_NP, reg, &val);
+
+	return val;
+}
+
+void intel_iosf_sb_write(uint32_t port, uint32_t reg, uint32_t val)
+{
+	vlv_sideband_rw(port, SB_CRWRDA_NP, reg, &val);
+}

tools/Makefile.sources

@@ -8,6 +8,8 @@ bin_PROGRAMS = 				\
 	intel_gpu_top 			\
 	intel_gpu_time 			\
 	intel_gtt 			\
+	intel_iosf_sb_read		\
+	intel_iosf_sb_write		\
 	intel_opregion_decode		\
 	intel_perf_counters		\
 	intel_stepping 			\

tools/intel_iosf_sb_read.c

@@ -0,0 +1,62 @@
+/*
+ * Copyright © 2014 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ */
+
+#include <unistd.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <err.h>
+#include <string.h>
+#include "intel_io.h"
+#include "intel_chipset.h"
+
+static void usage(const char *name)
+{
+	printf("Warning : This program will work only on Valleyview\n"
+	       "Usage: %s <port> <reg>\n"
+	       "\t port/reg : in 0xXXXX format\n",
+	       name);
+}
+
+int main(int argc, char *argv[])
+{
+	uint32_t port, reg, val;
+	struct pci_device *dev = intel_get_pci_device();
+
+	if (argc != 3 || !IS_VALLEYVIEW(dev->device_id)) {
+		usage(argv[0]);
+		return 1;
+	}
+
+	port = strtoul(argv[1], NULL, 16);
+	reg = strtoul(argv[2], NULL, 16);
+
+	intel_register_access_init(dev, 0);
+
+	val = intel_iosf_sb_read(port, reg);
+	printf("0x%02x/0x%04x : 0x%08x\n", port, reg, val);
+
+	intel_register_access_fini();
+
+	return 0;
+}

tools/intel_iosf_sb_write.c

@@ -0,0 +1,67 @@
+/*
+ * Copyright © 2014 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#include <unistd.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <err.h>
+#include <string.h>
+#include "intel_io.h"
+#include "intel_chipset.h"
+
+static void usage(const char *name)
+{
+	printf("Warning : This program will work only on Valleyview\n"
+	       "Usage: %s <port> <reg> <val>\n"
+	       "\t port/reg/val : in 0xXXXX format\n",
+	       name);
+}
+
+int main(int argc, char** argv)
+{
+	uint32_t port, reg, val, tmp;
+	struct pci_device *dev = intel_get_pci_device();
+
+	if (argc != 4 || !IS_VALLEYVIEW(dev->device_id)) {
+		usage(argv[0]);
+		return 1;
+	}
+
+	port = strtoul(argv[1], NULL, 16);
+	reg = strtoul(argv[2], NULL, 16);
+	val = strtoul(argv[3], NULL, 16);
+
+	intel_register_access_init(dev, 0);
+
+	tmp = intel_iosf_sb_read(port, reg);
+	printf("Value before: 0x%X\n", tmp);
+
+	intel_iosf_sb_write(port, reg, val);
+
+	tmp = intel_iosf_sb_read(port, reg);
+	printf("Value after: 0x%X\n", tmp);
+
+	intel_register_access_fini();
+
+	return 0;
+}