[PATCH v3 2/6] powerpc/powernv: Autoload IMC device driver module

[Hemant Kumar]

This patch does three things :
 - Enables "opal.c" to create a platform device for the IMC interface
   according to the appropriate compatibility string.
 - Find the reserved-memory region details from the system device tree
   and get the base address of HOMER region address for each chip.
 - We also get the Nest PMU counter data offsets (in the HOMER region)
   and their sizes. The offsets for the counters' data are fixed and
   won't change from chip to chip.

The device tree parsing logic is separated from the PMU creation
functions (which is done in subsequent patches). Right now, only Nest
units are taken care of.

Cc: Madhavan Srinivasan 
Cc: Michael Ellerman 
Cc: Benjamin Herrenschmidt 
Cc: Paul Mackerras 
Cc: Anton Blanchard 
Cc: Sukadev Bhattiprolu 
Cc: Michael Neuling 
Cc: Stewart Smith 
Cc: Daniel Axtens 
Cc: Stephane Eranian 
Signed-off-by: Hemant Kumar 
---
 arch/powerpc/platforms/powernv/Makefile   |   2 +-
 arch/powerpc/platforms/powernv/opal-imc.c | 117 ++
 arch/powerpc/platforms/powernv/opal.c |  13 
 3 files changed, 131 insertions(+), 1 deletion(-)
 create mode 100644 arch/powerpc/platforms/powernv/opal-imc.c

diff --git a/arch/powerpc/platforms/powernv/Makefile 
b/arch/powerpc/platforms/powernv/Makefile
index b5d98cb..44909fe 100644
--- a/arch/powerpc/platforms/powernv/Makefile
+++ b/arch/powerpc/platforms/powernv/Makefile
@@ -2,7 +2,7 @@ obj-y   += setup.o opal-wrappers.o opal.o 
opal-async.o idle.o
 obj-y  += opal-rtc.o opal-nvram.o opal-lpc.o opal-flash.o
 obj-y  += rng.o opal-elog.o opal-dump.o opal-sysparam.o 
opal-sensor.o
 obj-y  += opal-msglog.o opal-hmi.o opal-power.o opal-irqchip.o
-obj-y  += opal-kmsg.o
+obj-y  += opal-kmsg.o opal-imc.o
 
 obj-$(CONFIG_SMP)  += smp.o subcore.o subcore-asm.o
 obj-$(CONFIG_PCI)  += pci.o pci-ioda.o npu-dma.o
diff --git a/arch/powerpc/platforms/powernv/opal-imc.c 
b/arch/powerpc/platforms/powernv/opal-imc.c
new file mode 100644
index 000..ee2ae45
--- /dev/null
+++ b/arch/powerpc/platforms/powernv/opal-imc.c
@@ -0,0 +1,117 @@
+/*
+ * OPAL IMC interface detection driver
+ * Supported on POWERNV platform
+ *
+ * Copyright  (C) 2016 Madhavan Srinivasan, IBM Corporation.
+ *(C) 2016 Hemant K Shaw, IBM Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that 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 
+#include 
+#include 
+#include 
+#include 
+#include 
+#include 
+#include 
+#include 
+#include 
+#include 
+#include 
+#include 
+#include 
+#include 
+#include 
+
+struct perchip_nest_info nest_perchip_info[IMC_MAX_CHIPS];
+
+static int opal_imc_counters_probe(struct platform_device *pdev)
+{
+   struct device_node *child, *imc_dev, *rm_node = NULL;
+   struct perchip_nest_info *pcni;
+   u32 reg[4], pages, nest_offset, nest_size, idx;
+   int i = 0;
+   const char *node_name;
+
+   if (!pdev || !pdev->dev.of_node)
+   return -ENODEV;
+
+   imc_dev = pdev->dev.of_node;
+
+   /*
+* nest_offset : where the nest-counters' data start.
+* size : size of the entire nest-counters region
+*/
+   if (of_property_read_u32(imc_dev, "imc-nest-offset", _offset))
+   goto err;
+   if (of_property_read_u32(imc_dev, "imc-nest-size", _size))
+   goto err;
+
+   /* Find the "homer region" for each chip */
+   rm_node = of_find_node_by_path("/reserved-memory");
+   if (!rm_node)
+   goto err;
+
+   for_each_child_of_node(rm_node, child) {
+   if (of_property_read_string_index(child, "name", 0,
+ _name))
+   continue;
+   if (strncmp("ibm,homer-image", node_name,
+   strlen("ibm,homer-image")))
+   continue;
+
+   /* Get the chip id to which the above homer region belongs to */
+   if (of_property_read_u32(child, "ibm,chip-id", ))
+   goto err;
+
+   /* reg property will have four u32 cells. */
+   if (of_property_read_u32_array(child, "reg", reg, 4))
+   goto err;
+
+   pcni = _perchip_info[idx];
+
+   /* Fetch the homer region base 

[PATCH v3 2/6] powerpc/powernv: Autoload IMC device driver module

[Hemant Kumar]

This patch does three things :
 - Enables "opal.c" to create a platform device for the IMC interface
   according to the appropriate compatibility string.
 - Find the reserved-memory region details from the system device tree
   and get the base address of HOMER region address for each chip.
 - We also get the Nest PMU counter data offsets (in the HOMER region)
   and their sizes. The offsets for the counters' data are fixed and
   won't change from chip to chip.

The device tree parsing logic is separated from the PMU creation
functions (which is done in subsequent patches). Right now, only Nest
units are taken care of.

Cc: Madhavan Srinivasan 
Cc: Michael Ellerman 
Cc: Benjamin Herrenschmidt 
Cc: Paul Mackerras 
Cc: Anton Blanchard 
Cc: Sukadev Bhattiprolu 
Cc: Michael Neuling 
Cc: Stewart Smith 
Cc: Daniel Axtens 
Cc: Stephane Eranian 
Signed-off-by: Hemant Kumar 
---
 arch/powerpc/platforms/powernv/Makefile   |   2 +-
 arch/powerpc/platforms/powernv/opal-imc.c | 117 ++
 arch/powerpc/platforms/powernv/opal.c |  13 
 3 files changed, 131 insertions(+), 1 deletion(-)
 create mode 100644 arch/powerpc/platforms/powernv/opal-imc.c

diff --git a/arch/powerpc/platforms/powernv/Makefile 
b/arch/powerpc/platforms/powernv/Makefile
index b5d98cb..44909fe 100644
--- a/arch/powerpc/platforms/powernv/Makefile
+++ b/arch/powerpc/platforms/powernv/Makefile
@@ -2,7 +2,7 @@ obj-y   += setup.o opal-wrappers.o opal.o 
opal-async.o idle.o
 obj-y  += opal-rtc.o opal-nvram.o opal-lpc.o opal-flash.o
 obj-y  += rng.o opal-elog.o opal-dump.o opal-sysparam.o 
opal-sensor.o
 obj-y  += opal-msglog.o opal-hmi.o opal-power.o opal-irqchip.o
-obj-y  += opal-kmsg.o
+obj-y  += opal-kmsg.o opal-imc.o
 
 obj-$(CONFIG_SMP)  += smp.o subcore.o subcore-asm.o
 obj-$(CONFIG_PCI)  += pci.o pci-ioda.o npu-dma.o
diff --git a/arch/powerpc/platforms/powernv/opal-imc.c 
b/arch/powerpc/platforms/powernv/opal-imc.c
new file mode 100644
index 000..ee2ae45
--- /dev/null
+++ b/arch/powerpc/platforms/powernv/opal-imc.c
@@ -0,0 +1,117 @@
+/*
+ * OPAL IMC interface detection driver
+ * Supported on POWERNV platform
+ *
+ * Copyright  (C) 2016 Madhavan Srinivasan, IBM Corporation.
+ *(C) 2016 Hemant K Shaw, IBM Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that 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 
+#include 
+#include 
+#include 
+#include 
+#include 
+#include 
+#include 
+#include 
+#include 
+#include 
+#include 
+#include 
+#include 
+#include 
+#include 
+
+struct perchip_nest_info nest_perchip_info[IMC_MAX_CHIPS];
+
+static int opal_imc_counters_probe(struct platform_device *pdev)
+{
+   struct device_node *child, *imc_dev, *rm_node = NULL;
+   struct perchip_nest_info *pcni;
+   u32 reg[4], pages, nest_offset, nest_size, idx;
+   int i = 0;
+   const char *node_name;
+
+   if (!pdev || !pdev->dev.of_node)
+   return -ENODEV;
+
+   imc_dev = pdev->dev.of_node;
+
+   /*
+* nest_offset : where the nest-counters' data start.
+* size : size of the entire nest-counters region
+*/
+   if (of_property_read_u32(imc_dev, "imc-nest-offset", _offset))
+   goto err;
+   if (of_property_read_u32(imc_dev, "imc-nest-size", _size))
+   goto err;
+
+   /* Find the "homer region" for each chip */
+   rm_node = of_find_node_by_path("/reserved-memory");
+   if (!rm_node)
+   goto err;
+
+   for_each_child_of_node(rm_node, child) {
+   if (of_property_read_string_index(child, "name", 0,
+ _name))
+   continue;
+   if (strncmp("ibm,homer-image", node_name,
+   strlen("ibm,homer-image")))
+   continue;
+
+   /* Get the chip id to which the above homer region belongs to */
+   if (of_property_read_u32(child, "ibm,chip-id", ))
+   goto err;
+
+   /* reg property will have four u32 cells. */
+   if (of_property_read_u32_array(child, "reg", reg, 4))
+   goto err;
+
+   pcni = _perchip_info[idx];
+
+   /* Fetch the homer region base address */
+   pcni->pbase = reg[0];
+   pcni->pbase = pcni->pbase << 32 | reg[1];
+   /* Add the nest IMC Base offset */
+   pcni->pbase = pcni->pbase + nest_offset;
+   /* Fetch the