+++ /dev/null
-/* SPDX-License-Identifier: GPL-2.0-or-later */
-/*
- * Copyright 2010 Benjamin Herrenschmidt, IBM Corp
- * <benh@kernel.crashing.org>
- * and David Gibson, IBM Corporation.
- */
-
-#ifndef _ASM_POWERPC_SCOM_H
-#define _ASM_POWERPC_SCOM_H
-
-#ifdef __KERNEL__
-#ifndef __ASSEMBLY__
-#ifdef CONFIG_PPC_SCOM
-
-/*
- * The SCOM bus is a sideband bus used for accessing various internal
- * registers of the processor or the chipset. The implementation details
- * differ between processors and platforms, and the access method as
- * well.
- *
- * This API allows to "map" ranges of SCOM register numbers associated
- * with a given SCOM controller. The later must be represented by a
- * device node, though some implementations might support NULL if there
- * is no possible ambiguity
- *
- * Then, scom_read/scom_write can be used to accesses registers inside
- * that range. The argument passed is a register number relative to
- * the beginning of the range mapped.
- */
-
-typedef void *scom_map_t;
-
-/* Value for an invalid SCOM map */
-#define SCOM_MAP_INVALID (NULL)
-
-/* The scom_controller data structure is what the platform passes
- * to the core code in scom_init, it provides the actual implementation
- * of all the SCOM functions
- */
-struct scom_controller {
- scom_map_t (*map)(struct device_node *ctrl_dev, u64 reg, u64 count);
- void (*unmap)(scom_map_t map);
-
- int (*read)(scom_map_t map, u64 reg, u64 *value);
- int (*write)(scom_map_t map, u64 reg, u64 value);
-};
-
-extern const struct scom_controller *scom_controller;
-
-/**
- * scom_init - Initialize the SCOM backend, called by the platform
- * @controller: The platform SCOM controller
- */
-static inline void scom_init(const struct scom_controller *controller)
-{
- scom_controller = controller;
-}
-
-/**
- * scom_map_ok - Test is a SCOM mapping is successful
- * @map: The result of scom_map to test
- */
-static inline int scom_map_ok(scom_map_t map)
-{
- return map != SCOM_MAP_INVALID;
-}
-
-/**
- * scom_map - Map a block of SCOM registers
- * @ctrl_dev: Device node of the SCOM controller
- * some implementations allow NULL here
- * @reg: first SCOM register to map
- * @count: Number of SCOM registers to map
- */
-
-static inline scom_map_t scom_map(struct device_node *ctrl_dev,
- u64 reg, u64 count)
-{
- return scom_controller->map(ctrl_dev, reg, count);
-}
-
-/**
- * scom_find_parent - Find the SCOM controller for a device
- * @dev: OF node of the device
- *
- * This is not meant for general usage, but in combination with
- * scom_map() allows to map registers not represented by the
- * device own scom-reg property. Useful for applying HW workarounds
- * on things not properly represented in the device-tree for example.
- */
-struct device_node *scom_find_parent(struct device_node *dev);
-
-
-/**
- * scom_map_device - Map a device's block of SCOM registers
- * @dev: OF node of the device
- * @index: Register bank index (index in "scom-reg" property)
- *
- * This function will use the device-tree binding for SCOM which
- * is to follow "scom-parent" properties until it finds a node with
- * a "scom-controller" property to find the controller. It will then
- * use the "scom-reg" property which is made of reg/count pairs,
- * each of them having a size defined by the controller's #scom-cells
- * property
- */
-extern scom_map_t scom_map_device(struct device_node *dev, int index);
-
-
-/**
- * scom_unmap - Unmap a block of SCOM registers
- * @map: Result of scom_map is to be unmapped
- */
-static inline void scom_unmap(scom_map_t map)
-{
- if (scom_map_ok(map))
- scom_controller->unmap(map);
-}
-
-/**
- * scom_read - Read a SCOM register
- * @map: Result of scom_map
- * @reg: Register index within that map
- * @value: Updated with the value read
- *
- * Returns 0 (success) or a negative error code
- */
-static inline int scom_read(scom_map_t map, u64 reg, u64 *value)
-{
- int rc;
-
- rc = scom_controller->read(map, reg, value);
- if (rc)
- *value = 0xfffffffffffffffful;
- return rc;
-}
-
-/**
- * scom_write - Write to a SCOM register
- * @map: Result of scom_map
- * @reg: Register index within that map
- * @value: Value to write
- *
- * Returns 0 (success) or a negative error code
- */
-static inline int scom_write(scom_map_t map, u64 reg, u64 value)
-{
- return scom_controller->write(map, reg, value);
-}
-
-
-#endif /* CONFIG_PPC_SCOM */
-#endif /* __ASSEMBLY__ */
-#endif /* __KERNEL__ */
-#endif /* _ASM_POWERPC_SCOM_H */
select EPAPR_BOOT
select PPC_INDIRECT_PIO
select PPC_UDBG_16550
- select PPC_SCOM
select ARCH_RANDOM
select CPU_FREQ
select PPC_DOORBELL
VAS adapters are found in POWER9 based systems.
If unsure, say N.
+
+config SCOM_DEBUGFS
+ bool "Expose SCOM controllers via debugfs"
+ depends on DEBUG_FS
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 opal-powercap.o opal-psr.o opal-sensor-groups.o
+obj-y += opal-xscom.o scom.o
obj-$(CONFIG_SMP) += smp.o subcore.o subcore-asm.o
obj-$(CONFIG_PCI) += pci.o pci-ioda.o npu-dma.o pci-ioda-tce.o
obj-$(CONFIG_CXL_BASE) += pci-cxl.o
obj-$(CONFIG_EEH) += eeh-powernv.o
-obj-$(CONFIG_PPC_SCOM) += opal-xscom.o
obj-$(CONFIG_MEMORY_FAILURE) += opal-memory-errors.o
obj-$(CONFIG_OPAL_PRD) += opal-prd.o
obj-$(CONFIG_PERF_EVENTS) += opal-imc.o
#include <asm/machdep.h>
#include <asm/firmware.h>
#include <asm/opal.h>
-#include <asm/scom.h>
+
+#include "scom.h"
/*
* We could probably fit that inside the scom_map_t
--- /dev/null
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright 2010 Benjamin Herrenschmidt, IBM Corp
+ * <benh@kernel.crashing.org>
+ * and David Gibson, IBM Corporation.
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/export.h>
+#include <asm/debugfs.h>
+#include <asm/prom.h>
+#include <linux/uaccess.h>
+
+#include "scom.h"
+
+const struct scom_controller *scom_controller;
+EXPORT_SYMBOL_GPL(scom_controller);
+
+struct device_node *scom_find_parent(struct device_node *node)
+{
+ struct device_node *par, *tmp;
+ const u32 *p;
+
+ for (par = of_node_get(node); par;) {
+ if (of_get_property(par, "scom-controller", NULL))
+ break;
+ p = of_get_property(par, "scom-parent", NULL);
+ tmp = par;
+ if (p == NULL)
+ par = of_get_parent(par);
+ else
+ par = of_find_node_by_phandle(*p);
+ of_node_put(tmp);
+ }
+ return par;
+}
+EXPORT_SYMBOL_GPL(scom_find_parent);
+
+scom_map_t scom_map_device(struct device_node *dev, int index)
+{
+ struct device_node *parent;
+ unsigned int cells, size;
+ const __be32 *prop, *sprop;
+ u64 reg, cnt;
+ scom_map_t ret;
+
+ parent = scom_find_parent(dev);
+
+ if (parent == NULL)
+ return NULL;
+
+ /*
+ * We support "scom-reg" properties for adding scom registers
+ * to a random device-tree node with an explicit scom-parent
+ *
+ * We also support the simple "reg" property if the device is
+ * a direct child of a scom controller.
+ *
+ * In case both exist, "scom-reg" takes precedence.
+ */
+ prop = of_get_property(dev, "scom-reg", &size);
+ sprop = of_get_property(parent, "#scom-cells", NULL);
+ if (!prop && parent == dev->parent) {
+ prop = of_get_property(dev, "reg", &size);
+ sprop = of_get_property(parent, "#address-cells", NULL);
+ }
+ if (!prop)
+ return NULL;
+ cells = sprop ? be32_to_cpup(sprop) : 1;
+ size >>= 2;
+
+ if (index >= (size / (2*cells)))
+ return NULL;
+
+ reg = of_read_number(&prop[index * cells * 2], cells);
+ cnt = of_read_number(&prop[index * cells * 2 + cells], cells);
+
+ ret = scom_map(parent, reg, cnt);
+ of_node_put(parent);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(scom_map_device);
+
+#ifdef CONFIG_SCOM_DEBUGFS
+struct scom_debug_entry {
+ struct device_node *dn;
+ struct debugfs_blob_wrapper path;
+ char name[16];
+};
+
+static ssize_t scom_debug_read(struct file *filp, char __user *ubuf,
+ size_t count, loff_t *ppos)
+{
+ struct scom_debug_entry *ent = filp->private_data;
+ u64 __user *ubuf64 = (u64 __user *)ubuf;
+ loff_t off = *ppos;
+ ssize_t done = 0;
+ u64 reg, reg_cnt, val;
+ scom_map_t map;
+ int rc;
+
+ if (off < 0 || (off & 7) || (count & 7))
+ return -EINVAL;
+ reg = off >> 3;
+ reg_cnt = count >> 3;
+
+ map = scom_map(ent->dn, reg, reg_cnt);
+ if (!scom_map_ok(map))
+ return -ENXIO;
+
+ for (reg = 0; reg < reg_cnt; reg++) {
+ rc = scom_read(map, reg, &val);
+ if (!rc)
+ rc = put_user(val, ubuf64);
+ if (rc) {
+ if (!done)
+ done = rc;
+ break;
+ }
+ ubuf64++;
+ *ppos += 8;
+ done += 8;
+ }
+ scom_unmap(map);
+ return done;
+}
+
+static ssize_t scom_debug_write(struct file* filp, const char __user *ubuf,
+ size_t count, loff_t *ppos)
+{
+ struct scom_debug_entry *ent = filp->private_data;
+ u64 __user *ubuf64 = (u64 __user *)ubuf;
+ loff_t off = *ppos;
+ ssize_t done = 0;
+ u64 reg, reg_cnt, val;
+ scom_map_t map;
+ int rc;
+
+ if (off < 0 || (off & 7) || (count & 7))
+ return -EINVAL;
+ reg = off >> 3;
+ reg_cnt = count >> 3;
+
+ map = scom_map(ent->dn, reg, reg_cnt);
+ if (!scom_map_ok(map))
+ return -ENXIO;
+
+ for (reg = 0; reg < reg_cnt; reg++) {
+ rc = get_user(val, ubuf64);
+ if (!rc)
+ rc = scom_write(map, reg, val);
+ if (rc) {
+ if (!done)
+ done = rc;
+ break;
+ }
+ ubuf64++;
+ done += 8;
+ }
+ scom_unmap(map);
+ return done;
+}
+
+static const struct file_operations scom_debug_fops = {
+ .read = scom_debug_read,
+ .write = scom_debug_write,
+ .open = simple_open,
+ .llseek = default_llseek,
+};
+
+static int scom_debug_init_one(struct dentry *root, struct device_node *dn,
+ int i)
+{
+ struct scom_debug_entry *ent;
+ struct dentry *dir;
+
+ ent = kzalloc(sizeof(*ent), GFP_KERNEL);
+ if (!ent)
+ return -ENOMEM;
+
+ ent->dn = of_node_get(dn);
+ snprintf(ent->name, 16, "%08x", i);
+ ent->path.data = (void*)kasprintf(GFP_KERNEL, "%pOF", dn);
+ ent->path.size = strlen((char *)ent->path.data);
+
+ dir = debugfs_create_dir(ent->name, root);
+ if (!dir) {
+ of_node_put(dn);
+ kfree(ent->path.data);
+ kfree(ent);
+ return -1;
+ }
+
+ debugfs_create_blob("devspec", 0400, dir, &ent->path);
+ debugfs_create_file("access", 0600, dir, ent, &scom_debug_fops);
+
+ return 0;
+}
+
+static int scom_debug_init(void)
+{
+ struct device_node *dn;
+ struct dentry *root;
+ int i, rc;
+
+ root = debugfs_create_dir("scom", powerpc_debugfs_root);
+ if (!root)
+ return -1;
+
+ i = rc = 0;
+ for_each_node_with_property(dn, "scom-controller") {
+ int id = of_get_ibm_chip_id(dn);
+ if (id == -1)
+ id = i;
+ rc |= scom_debug_init_one(root, dn, id);
+ i++;
+ }
+
+ return rc;
+}
+device_initcall(scom_debug_init);
+#endif /* CONFIG_SCOM_DEBUGFS */
--- /dev/null
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright 2010 Benjamin Herrenschmidt, IBM Corp
+ * <benh@kernel.crashing.org>
+ * and David Gibson, IBM Corporation.
+ */
+
+#ifndef _SCOM_H
+#define _SCOM_H
+
+/*
+ * The SCOM bus is a sideband bus used for accessing various internal
+ * registers of the processor or the chipset. The implementation details
+ * differ between processors and platforms, and the access method as
+ * well.
+ *
+ * This API allows to "map" ranges of SCOM register numbers associated
+ * with a given SCOM controller. The later must be represented by a
+ * device node, though some implementations might support NULL if there
+ * is no possible ambiguity
+ *
+ * Then, scom_read/scom_write can be used to accesses registers inside
+ * that range. The argument passed is a register number relative to
+ * the beginning of the range mapped.
+ */
+
+typedef void *scom_map_t;
+
+/* Value for an invalid SCOM map */
+#define SCOM_MAP_INVALID (NULL)
+
+/* The scom_controller data structure is what the platform passes
+ * to the core code in scom_init, it provides the actual implementation
+ * of all the SCOM functions
+ */
+struct scom_controller {
+ scom_map_t (*map)(struct device_node *ctrl_dev, u64 reg, u64 count);
+ void (*unmap)(scom_map_t map);
+
+ int (*read)(scom_map_t map, u64 reg, u64 *value);
+ int (*write)(scom_map_t map, u64 reg, u64 value);
+};
+
+extern const struct scom_controller *scom_controller;
+
+/**
+ * scom_init - Initialize the SCOM backend, called by the platform
+ * @controller: The platform SCOM controller
+ */
+static inline void scom_init(const struct scom_controller *controller)
+{
+ scom_controller = controller;
+}
+
+/**
+ * scom_map_ok - Test is a SCOM mapping is successful
+ * @map: The result of scom_map to test
+ */
+static inline int scom_map_ok(scom_map_t map)
+{
+ return map != SCOM_MAP_INVALID;
+}
+
+/**
+ * scom_map - Map a block of SCOM registers
+ * @ctrl_dev: Device node of the SCOM controller
+ * some implementations allow NULL here
+ * @reg: first SCOM register to map
+ * @count: Number of SCOM registers to map
+ */
+
+static inline scom_map_t scom_map(struct device_node *ctrl_dev,
+ u64 reg, u64 count)
+{
+ return scom_controller->map(ctrl_dev, reg, count);
+}
+
+/**
+ * scom_find_parent - Find the SCOM controller for a device
+ * @dev: OF node of the device
+ *
+ * This is not meant for general usage, but in combination with
+ * scom_map() allows to map registers not represented by the
+ * device own scom-reg property. Useful for applying HW workarounds
+ * on things not properly represented in the device-tree for example.
+ */
+struct device_node *scom_find_parent(struct device_node *dev);
+
+
+/**
+ * scom_map_device - Map a device's block of SCOM registers
+ * @dev: OF node of the device
+ * @index: Register bank index (index in "scom-reg" property)
+ *
+ * This function will use the device-tree binding for SCOM which
+ * is to follow "scom-parent" properties until it finds a node with
+ * a "scom-controller" property to find the controller. It will then
+ * use the "scom-reg" property which is made of reg/count pairs,
+ * each of them having a size defined by the controller's #scom-cells
+ * property
+ */
+extern scom_map_t scom_map_device(struct device_node *dev, int index);
+
+
+/**
+ * scom_unmap - Unmap a block of SCOM registers
+ * @map: Result of scom_map is to be unmapped
+ */
+static inline void scom_unmap(scom_map_t map)
+{
+ if (scom_map_ok(map))
+ scom_controller->unmap(map);
+}
+
+/**
+ * scom_read - Read a SCOM register
+ * @map: Result of scom_map
+ * @reg: Register index within that map
+ * @value: Updated with the value read
+ *
+ * Returns 0 (success) or a negative error code
+ */
+static inline int scom_read(scom_map_t map, u64 reg, u64 *value)
+{
+ int rc;
+
+ rc = scom_controller->read(map, reg, value);
+ if (rc)
+ *value = 0xfffffffffffffffful;
+ return rc;
+}
+
+/**
+ * scom_write - Write to a SCOM register
+ * @map: Result of scom_map
+ * @reg: Register index within that map
+ * @value: Value to write
+ *
+ * Returns 0 (success) or a negative error code
+ */
+static inline int scom_write(scom_map_t map, u64 reg, u64 value)
+{
+ return scom_controller->write(map, reg, value);
+}
+
+
+#endif /* _SCOM_H */
source "arch/powerpc/sysdev/xics/Kconfig"
source "arch/powerpc/sysdev/xive/Kconfig"
-config PPC_SCOM
- bool
-
-config SCOM_DEBUGFS
- bool "Expose SCOM controllers via debugfs"
- depends on PPC_SCOM && DEBUG_FS
-
config GE_FPGA
bool
obj-$(CONFIG_PPC_BOOK3S_32) += 6xx-suspend.o
endif
-obj-$(CONFIG_PPC_SCOM) += scom.o
-
obj-$(CONFIG_PPC_EARLY_DEBUG_MEMCONS) += udbg_memcons.o
obj-$(CONFIG_PPC_XICS) += xics/
+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0-or-later
-/*
- * Copyright 2010 Benjamin Herrenschmidt, IBM Corp
- * <benh@kernel.crashing.org>
- * and David Gibson, IBM Corporation.
- */
-
-#include <linux/kernel.h>
-#include <linux/slab.h>
-#include <linux/export.h>
-#include <asm/debugfs.h>
-#include <asm/prom.h>
-#include <asm/scom.h>
-#include <linux/uaccess.h>
-
-const struct scom_controller *scom_controller;
-EXPORT_SYMBOL_GPL(scom_controller);
-
-struct device_node *scom_find_parent(struct device_node *node)
-{
- struct device_node *par, *tmp;
- const u32 *p;
-
- for (par = of_node_get(node); par;) {
- if (of_get_property(par, "scom-controller", NULL))
- break;
- p = of_get_property(par, "scom-parent", NULL);
- tmp = par;
- if (p == NULL)
- par = of_get_parent(par);
- else
- par = of_find_node_by_phandle(*p);
- of_node_put(tmp);
- }
- return par;
-}
-EXPORT_SYMBOL_GPL(scom_find_parent);
-
-scom_map_t scom_map_device(struct device_node *dev, int index)
-{
- struct device_node *parent;
- unsigned int cells, size;
- const __be32 *prop, *sprop;
- u64 reg, cnt;
- scom_map_t ret;
-
- parent = scom_find_parent(dev);
-
- if (parent == NULL)
- return NULL;
-
- /*
- * We support "scom-reg" properties for adding scom registers
- * to a random device-tree node with an explicit scom-parent
- *
- * We also support the simple "reg" property if the device is
- * a direct child of a scom controller.
- *
- * In case both exist, "scom-reg" takes precedence.
- */
- prop = of_get_property(dev, "scom-reg", &size);
- sprop = of_get_property(parent, "#scom-cells", NULL);
- if (!prop && parent == dev->parent) {
- prop = of_get_property(dev, "reg", &size);
- sprop = of_get_property(parent, "#address-cells", NULL);
- }
- if (!prop)
- return NULL;
- cells = sprop ? be32_to_cpup(sprop) : 1;
- size >>= 2;
-
- if (index >= (size / (2*cells)))
- return NULL;
-
- reg = of_read_number(&prop[index * cells * 2], cells);
- cnt = of_read_number(&prop[index * cells * 2 + cells], cells);
-
- ret = scom_map(parent, reg, cnt);
- of_node_put(parent);
-
- return ret;
-}
-EXPORT_SYMBOL_GPL(scom_map_device);
-
-#ifdef CONFIG_SCOM_DEBUGFS
-struct scom_debug_entry {
- struct device_node *dn;
- struct debugfs_blob_wrapper path;
- char name[16];
-};
-
-static ssize_t scom_debug_read(struct file *filp, char __user *ubuf,
- size_t count, loff_t *ppos)
-{
- struct scom_debug_entry *ent = filp->private_data;
- u64 __user *ubuf64 = (u64 __user *)ubuf;
- loff_t off = *ppos;
- ssize_t done = 0;
- u64 reg, reg_cnt, val;
- scom_map_t map;
- int rc;
-
- if (off < 0 || (off & 7) || (count & 7))
- return -EINVAL;
- reg = off >> 3;
- reg_cnt = count >> 3;
-
- map = scom_map(ent->dn, reg, reg_cnt);
- if (!scom_map_ok(map))
- return -ENXIO;
-
- for (reg = 0; reg < reg_cnt; reg++) {
- rc = scom_read(map, reg, &val);
- if (!rc)
- rc = put_user(val, ubuf64);
- if (rc) {
- if (!done)
- done = rc;
- break;
- }
- ubuf64++;
- *ppos += 8;
- done += 8;
- }
- scom_unmap(map);
- return done;
-}
-
-static ssize_t scom_debug_write(struct file* filp, const char __user *ubuf,
- size_t count, loff_t *ppos)
-{
- struct scom_debug_entry *ent = filp->private_data;
- u64 __user *ubuf64 = (u64 __user *)ubuf;
- loff_t off = *ppos;
- ssize_t done = 0;
- u64 reg, reg_cnt, val;
- scom_map_t map;
- int rc;
-
- if (off < 0 || (off & 7) || (count & 7))
- return -EINVAL;
- reg = off >> 3;
- reg_cnt = count >> 3;
-
- map = scom_map(ent->dn, reg, reg_cnt);
- if (!scom_map_ok(map))
- return -ENXIO;
-
- for (reg = 0; reg < reg_cnt; reg++) {
- rc = get_user(val, ubuf64);
- if (!rc)
- rc = scom_write(map, reg, val);
- if (rc) {
- if (!done)
- done = rc;
- break;
- }
- ubuf64++;
- done += 8;
- }
- scom_unmap(map);
- return done;
-}
-
-static const struct file_operations scom_debug_fops = {
- .read = scom_debug_read,
- .write = scom_debug_write,
- .open = simple_open,
- .llseek = default_llseek,
-};
-
-static int scom_debug_init_one(struct dentry *root, struct device_node *dn,
- int i)
-{
- struct scom_debug_entry *ent;
- struct dentry *dir;
-
- ent = kzalloc(sizeof(*ent), GFP_KERNEL);
- if (!ent)
- return -ENOMEM;
-
- ent->dn = of_node_get(dn);
- snprintf(ent->name, 16, "%08x", i);
- ent->path.data = (void*)kasprintf(GFP_KERNEL, "%pOF", dn);
- ent->path.size = strlen((char *)ent->path.data);
-
- dir = debugfs_create_dir(ent->name, root);
- if (!dir) {
- of_node_put(dn);
- kfree(ent->path.data);
- kfree(ent);
- return -1;
- }
-
- debugfs_create_blob("devspec", 0400, dir, &ent->path);
- debugfs_create_file("access", 0600, dir, ent, &scom_debug_fops);
-
- return 0;
-}
-
-static int scom_debug_init(void)
-{
- struct device_node *dn;
- struct dentry *root;
- int i, rc;
-
- root = debugfs_create_dir("scom", powerpc_debugfs_root);
- if (!root)
- return -1;
-
- i = rc = 0;
- for_each_node_with_property(dn, "scom-controller") {
- int id = of_get_ibm_chip_id(dn);
- if (id == -1)
- id = i;
- rc |= scom_debug_init_one(root, dn, id);
- i++;
- }
-
- return rc;
-}
-device_initcall(scom_debug_init);
-#endif /* CONFIG_SCOM_DEBUGFS */
projects / mirror_ubuntu-jammy-kernel.git / commitdiff