Prepare generating software nodes for information parsed from ACPI _CRS for
CSI-2 as well as MIPI DisCo for Imaging spec. The software nodes are
compliant with existing ACPI or DT definitions and are parsed by relevant
drivers without changes.
Signed-off-by: Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxx>
---
drivers/acpi/internal.h | 1 +
drivers/acpi/mipi.c | 359 +++++++++++++++++++++++++++++++++++++++-
drivers/acpi/scan.c | 18 ++
include/acpi/acpi_bus.h | 70 ++++++++
4 files changed, 447 insertions(+), 1 deletion(-)
diff --git a/drivers/acpi/internal.h b/drivers/acpi/internal.h
index 9db8b2e2730a..4723690d0117 100644
--- a/drivers/acpi/internal.h
+++ b/drivers/acpi/internal.h
@@ -307,5 +307,6 @@ static inline void acpi_init_lpit(void) { }
void acpi_crs_csi2_swnodes_del_free(void);
void acpi_bus_scan_check_crs_csi2(acpi_handle handle, struct acpi_scan_context *ctx);
void acpi_bus_scan_crs_csi2(struct acpi_scan_context_csi2 *ctx);
+void acpi_init_swnodes(struct acpi_device *device);
#endif /* _ACPI_INTERNAL_H_ */
diff --git a/drivers/acpi/mipi.c b/drivers/acpi/mipi.c
index ffc1768f86ed..5d05d899bede 100644
--- a/drivers/acpi/mipi.c
+++ b/drivers/acpi/mipi.c
@@ -3,7 +3,8 @@
* MIPI DisCo for Imaging support.
*
* Support MIPI DisCo for Imaging by parsing ACPI _CRS CSI2 records and DisCo
- * for Imaging data structures.
+ * for Imaging data structures and generating nodes and properties using
+ * software nodes compliant with DT definitions of the similar scope.
*
* Also see <URL:https://www.mipi.org/specifications/mipi-disco-imaging>.
*
@@ -20,6 +21,8 @@
#include <linux/sort.h>
#include <linux/string.h>
+#include <media/v4l2-fwnode.h>
+
#include "internal.h"
/* Temporary ACPI device handle to software node data structure mapping */
@@ -31,6 +34,18 @@ struct crs_csi2_swnodes {
static LIST_HEAD(crs_csi2_swnodes);
+/* Obtain pre-allocated software nodes for an ACPI device handle */
+static struct acpi_device_software_nodes *crs_csi2_swnode_get(acpi_handle handle)
+{
+ struct crs_csi2_swnodes *swnodes;
+
+ list_for_each_entry(swnodes, &crs_csi2_swnodes, list)
+ if (swnodes->handle == handle)
+ return swnodes->ads;
+
+ return NULL;
+}
+
static void crs_csi2_swnode_del_free(struct crs_csi2_swnodes *swnodes)
{
list_del(&swnodes->list);
@@ -166,6 +181,35 @@ struct acpi_handle_ref {
#define NO_CSI2_PORT (UINT_MAX - 1)
+/*
+ * Return next free entry in ports array of a software nodes related to an ACPI
+ * device.
+ */
+static unsigned int next_csi2_port_index(struct acpi_device_software_nodes *ads,
+ unsigned int port_nr)
+{
+ unsigned int i;
+
+ for (i = 0; i < ads->num_ports; i++) {
+ struct acpi_device_software_node_port *port = &ads->ports[i];
+
+ if (port->port_nr == port_nr)
+ return i;
+
+ if (port->port_nr == NO_CSI2_PORT) {
+ port->port_nr = port_nr;
+ return i;
+ }
+ }
+
+ return NO_CSI2_PORT;
+}
+
+/* Print graph port name into a buffer, return non-zero if failed. */
+#define GRAPH_PORT_NAME(var, num) \
+ (snprintf((var), sizeof(var), SWNODE_GRAPH_PORT_NAME_FMT, (num)) >= \
+ sizeof(var))
+
static int crs_handle_cmp(const void *__a, const void *__b)
{
const struct acpi_handle_ref *a = __a, *b = __b;
@@ -258,6 +302,9 @@ static void acpi_crs_csi2_alloc_fill_swnodes(size_t ports_count, acpi_handle han
ports_count);
}
+#define ACPI_CRS_CSI2_PHY_TYPE_C 0
+#define ACPI_CRS_CSI2_PHY_TYPE_D 1
+
/**
* acpi_bus_scan_crs_csi2 - Construct software nodes out of ACPI _CRS CSI2
* resource descriptors
@@ -274,6 +321,8 @@ static void acpi_crs_csi2_alloc_fill_swnodes(size_t ports_count, acpi_handle han
* 3. Allocate memory for swnodes each ACPI device requires later on, and
* generate a list of such allocations.
*
+ * 4. Set up properties for software nodes.
+ *
* Note that struct acpi_device may not be available yet at this time.
*
* acpi_scan_lock in scan.c must be held when calling this function.
@@ -339,7 +388,315 @@ void acpi_bus_scan_crs_csi2(struct acpi_scan_context_csi2 *ctx)
this_count = this->count;
}
+ /*
+ * Allocate and set up necessary software nodes for each device and set
+ * up properties from _CRS CSI2 descriptor.
+ */
+ list_for_each_entry(csi2, &ctx->crs_csi2_head, list) {
+ struct acpi_device_software_nodes *local_swnodes;
+ struct crs_csi2_instance *inst;
+
+ local_swnodes = crs_csi2_swnode_get(csi2->handle);
+ if (WARN_ON_ONCE(!local_swnodes))
+ continue;
+
+ list_for_each_entry(inst, &csi2->buses, list) {
+ struct acpi_device_software_nodes *remote_swnodes;
+ struct acpi_device_software_node_port *local_port;
+ struct acpi_device_software_node_port *remote_port;
+ struct software_node *local_node, *remote_node;
+ unsigned int local_index, remote_index;
+ unsigned int bus_type;
+
+ remote_swnodes = crs_csi2_swnode_get(inst->remote_handle);
+ if (WARN_ON_ONCE(!remote_swnodes))
+ continue;
+
+ local_index = next_csi2_port_index(local_swnodes, inst->csi2.local_port_instance);
+ remote_index = next_csi2_port_index(remote_swnodes, inst->csi2.resource_source.index);
+
+ if (WARN_ON_ONCE(local_index >= local_swnodes->num_ports) ||
+ WARN_ON_ONCE(remote_index >= remote_swnodes->num_ports))
+ goto out_free;
+
+ switch (inst->csi2.phy_type) {
+ case ACPI_CRS_CSI2_PHY_TYPE_C:
+ bus_type = V4L2_FWNODE_BUS_TYPE_CSI2_CPHY;
+ break;
+ case ACPI_CRS_CSI2_PHY_TYPE_D:
+ bus_type = V4L2_FWNODE_BUS_TYPE_CSI2_DPHY;
+ break;
+ default:
+ acpi_handle_info(csi2->handle,
+ "ignoring CSI-2 PHY type %u\n",
+ inst->csi2.phy_type);
+ continue;
+ }
+
+ local_port = &local_swnodes->ports[local_index];
+ local_node = &local_swnodes->nodes[ACPI_DEVICE_SWNODE_EP(local_index)];
+ local_port->remote_ep_ref[0] = SOFTWARE_NODE_REFERENCE(local_node);
+ local_port->crs_csi2_local = true;
+
+ remote_port = &remote_swnodes->ports[remote_index];
+ remote_node = &remote_swnodes->nodes[ACPI_DEVICE_SWNODE_EP(remote_index)];
+ remote_port->remote_ep_ref[0] = SOFTWARE_NODE_REFERENCE(remote_node);
+
+ local_port->ep_props[ACPI_DEVICE_SWNODE_EP_REMOTE_EP] =
+ PROPERTY_ENTRY_REF_ARRAY("remote-endpoint",
+ remote_port->remote_ep_ref);
+ local_port->ep_props[ACPI_DEVICE_SWNODE_EP_BUS_TYPE] =
+ PROPERTY_ENTRY_U32("bus-type", bus_type);
+ local_port->ep_props[ACPI_DEVICE_SWNODE_EP_REG] =
+ PROPERTY_ENTRY_U32("reg", 0);
+ local_port->port_props[ACPI_DEVICE_SWNODE_PRT_REG] =
+ PROPERTY_ENTRY_U32("reg", inst->csi2.local_port_instance);
+ if (GRAPH_PORT_NAME(local_port->port_name,
+ inst->csi2.local_port_instance))
+ acpi_handle_warn(csi2->handle,
+ "name for local port %u too long",
+ inst->csi2.local_port_instance);
+
+ remote_port->ep_props[ACPI_DEVICE_SWNODE_EP_REMOTE_EP] =
+ PROPERTY_ENTRY_REF_ARRAY("remote-endpoint", local_port->remote_ep_ref);
+ remote_port->ep_props[ACPI_DEVICE_SWNODE_EP_BUS_TYPE] =
+ PROPERTY_ENTRY_U32("bus-type", bus_type);
+ remote_port->ep_props[ACPI_DEVICE_SWNODE_EP_REG] =
+ PROPERTY_ENTRY_U32("reg", 0);
+ remote_port->port_props[ACPI_DEVICE_SWNODE_PRT_REG] =
+ PROPERTY_ENTRY_U32("reg",
+ inst->csi2.resource_source.index);
+ if (GRAPH_PORT_NAME(remote_port->port_name,
+ inst->csi2.resource_source.index))
+ acpi_handle_warn(csi2->handle,
+ "name for remote port %u too long",
+ inst->csi2.resource_source.index);
+ }
+ }
+
+out_free:
kfree(handle_refs);
crs_csi2_release(&ctx->crs_csi2_head);
}
+
+/*
+ * Get the index of the next property in the property array, with a given
+ * maximum values.
+ */
+#define NEXT_PROPERTY(index, max) \
+ (WARN_ON(++(index) > ACPI_DEVICE_SWNODE_##max + 1) ? \
+ ACPI_DEVICE_SWNODE_##max : (index) - 1)
+
+static struct fwnode_handle *get_mipi_port_handle(struct acpi_device *device,
+ unsigned int port)
+{
+ static const char mipi_port_prefix[] = "mipi-img-port-";
+ char mipi_port_name[sizeof(mipi_port_prefix) + 2];
+
+ if (snprintf(mipi_port_name, sizeof(mipi_port_name), "%s%u",
+ mipi_port_prefix, port) >= sizeof(mipi_port_name)) {
+ acpi_handle_info(acpi_device_handle(device),
+ "mipi port name too long for port %u\n", port);
+ return NULL;
+ }
+
+ return fwnode_get_named_child_node(acpi_fwnode_handle(device),
+ mipi_port_name);
+}
+
+static void init_port_csi2_common(struct acpi_device *device,
+ struct fwnode_handle *mipi_port_fwnode,
+ unsigned int *ep_prop_index,
+ unsigned int port_nr)
+{
+ unsigned int port_index = next_csi2_port_index(device->swnodes, port_nr);
+ struct acpi_device_software_nodes *ads = device->swnodes;
+ struct acpi_device_software_node_port *port = &ads->ports[port_index];
+ unsigned int num_lanes = 0;
+ u8 val[ARRAY_SIZE(port->data_lanes)];
+ int ret;
+
+ *ep_prop_index = ACPI_DEVICE_SWNODE_EP_CLOCK_LANES;
+
+ if (GRAPH_PORT_NAME(port->port_name, port_nr))
+ return;
+
+ ads->nodes[ACPI_DEVICE_SWNODE_PRT(port_index)] =
+ SOFTWARE_NODE(port->port_name, port->port_props,
+ &ads->nodes[ACPI_DEVICE_SWNODE_ROOT]);
+
+ ret = fwnode_property_read_u8(mipi_port_fwnode, "mipi-img-clock-lane", val);
+ if (!ret) {
+ port->ep_props[NEXT_PROPERTY(*ep_prop_index, EP_CLOCK_LANES)] =
+ PROPERTY_ENTRY_U32("clock-lanes", *val);
+ }
+ ret = fwnode_property_count_u8(mipi_port_fwnode, "mipi-img-data-lanes");
+ if (ret > 0) {
+ num_lanes = ret;
+
+ if (num_lanes > ARRAY_SIZE(port->data_lanes)) {
+ acpi_handle_warn(acpi_device_handle(device),
+ "too many data lanes (%u)\n",
+ num_lanes);
+ num_lanes = ARRAY_SIZE(port->data_lanes);
+ }
+
+ ret = fwnode_property_read_u8_array(mipi_port_fwnode, "mipi-img-data-lanes",
+ val, num_lanes);
+ if (!ret) {
+ unsigned int i;
+
+ for (i = 0; i < num_lanes; i++)
+ port->data_lanes[i] = val[i];
+
+ port->ep_props[NEXT_PROPERTY(*ep_prop_index, EP_DATA_LANES)] =
+ PROPERTY_ENTRY_U32_ARRAY_LEN("data-lanes", port->data_lanes,
+ num_lanes);
+ }
+ }
+
+ ret = fwnode_property_count_u8(mipi_port_fwnode, "mipi-img-lane-polarities");
+ if (ret > 0) {
+ unsigned int bytes = min_t(unsigned int, ret, sizeof(val));
+
+ fwnode_property_read_u8_array(mipi_port_fwnode,
+ "mipi-img-lane-polarities",
+ val, bytes);
+
+ /* Total number of lanes here is clock lane + data lanes */
+ if (bytes * BITS_PER_TYPE(u8) >= 1 + num_lanes) {
+ unsigned int i;
+
+ /* Move polarity bits to the lane polarity u32 array */
+ for (i = 0; i < 1 + num_lanes; i++)
+ port->lane_polarities[i] =
+ (bool)(val[i >> 3] & (1 << (i & 7)));
+
+ port->ep_props[NEXT_PROPERTY(*ep_prop_index, EP_LANE_POLARITIES)] =
+ PROPERTY_ENTRY_U32_ARRAY_LEN("lane-polarities",
+ port->lane_polarities,
+ 1 + num_lanes);
+ } else {
+ acpi_handle_warn(acpi_device_handle(device),
+ "too few lane polarity bytes (%u)\n",
+ bytes);
+ }
+ }
+
+ ads->nodes[ACPI_DEVICE_SWNODE_EP(port_index)] =
+ SOFTWARE_NODE("endpoint@0", ads->ports[port_index].ep_props,
+ &ads->nodes[ACPI_DEVICE_SWNODE_PRT(port_index)]);
+}
+
+static void init_port_csi2_local(struct acpi_device *device,
+ unsigned int port_nr)
+{
+ unsigned int port_index = next_csi2_port_index(device->swnodes, port_nr);
+ struct fwnode_handle *mipi_port_fwnode =
+ get_mipi_port_handle(device, port_nr);
+ struct acpi_device_software_node_port *port =
+ &device->swnodes->ports[port_index];
+ unsigned int ep_prop_index;
+ int ret;
+
+ init_port_csi2_common(device, mipi_port_fwnode, &ep_prop_index, port_nr);
+
+ ret = fwnode_property_count_u64(mipi_port_fwnode, "mipi-img-link-frequencies");
+ if (ret > 0) {
+ unsigned int num_link_freqs = ret;
+
+ if (num_link_freqs > ARRAY_SIZE(port->link_frequencies)) {
+ acpi_handle_info(acpi_device_handle(device),
+ "too many link frequencies %u\n",
+ num_link_freqs);
+ num_link_freqs = ARRAY_SIZE(port->link_frequencies);
+ }
+
+ ret = fwnode_property_read_u64_array(mipi_port_fwnode,
+ "mipi-img-link-frequencies",
+ port->link_frequencies,
+ num_link_freqs);
+ if (!ret)
+ port->ep_props[NEXT_PROPERTY(ep_prop_index, EP_LINK_FREQUENCIES)] =
+ PROPERTY_ENTRY_U64_ARRAY_LEN("link-frequencies",
+ port->link_frequencies,
+ num_link_freqs);
+ else
+ acpi_handle_info(acpi_device_handle(device),
+ "can't get link frequencies (%d)\n",
+ ret);
+ }
+
+ fwnode_handle_put(mipi_port_fwnode);
+}
+
+static void init_port_csi2_remote(struct acpi_device *device,
+ unsigned int port_nr)
+{
+ struct fwnode_handle *mipi_port_fwnode = get_mipi_port_handle(device, port_nr);
+ unsigned int ep_prop_index;
+
+ init_port_csi2_common(device, mipi_port_fwnode, &ep_prop_index, port_nr);
+
+ fwnode_handle_put(mipi_port_fwnode);
+}
+
+/**
+ * acpi_init_swnodes - Set up software nodes for properties gathered elsewhere
+ *
+ * @device: ACPI device for which the software nodes are initialised
+ *
+ * Initialise and register software nodes for properties for which the data is
+ * gathered elsewhere, e.g. _CRS CSI-2 descriptors. The process itself takes
+ * place before this function is called.
+ *
+ * acpi_scan_lock in scan.c must be held when calling this function.
+ */
+void acpi_init_swnodes(struct acpi_device *device)
+{
+ struct acpi_device_software_nodes *ads;
+ struct acpi_buffer buffer = { .length = ACPI_ALLOCATE_BUFFER };
+ acpi_handle handle = acpi_device_handle(device);
+ struct fwnode_handle *primary;
+ acpi_status status;
+ unsigned int i;
+ int ret;
+
+ device->swnodes = ads = crs_csi2_swnode_get(handle);
+ if (!ads)
+ return;
+
+ status = acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
+ if (ACPI_FAILURE(status)) {
+ acpi_handle_warn(handle, "cannot get path name\n");
+ return;
+ }
+
+ ads->nodes[ACPI_DEVICE_SWNODE_ROOT] =
+ SOFTWARE_NODE(buffer.pointer, ads->dev_props, NULL);
+
+ for (i = 0; i < ads->num_ports; i++) {
+ struct acpi_device_software_node_port *port = &ads->ports[i];
+
+ if (port->crs_csi2_local)
+ init_port_csi2_local(device, port->port_nr);
+ else
+ init_port_csi2_remote(device, port->port_nr);
+ }
+
+ ret = software_node_register_node_group(ads->nodeptrs);
+ if (ret < 0) {
+ acpi_handle_warn(handle,
+ "cannot register software nodes (%d)!\n", ret);
+ device->swnodes = NULL;
+ return;
+ }
+
+ /*
+ * Note we can't use set_secondary_fwnode() here as the device's
+ * primary fwnode hasn't been set yet.
+ */
+ primary = acpi_fwnode_handle(device);
+ primary->secondary = software_node_fwnode(ads->nodes);
+}
diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index 4f4f6b0db0a9..c21e5dedc5f1 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -449,10 +449,28 @@ static void acpi_free_power_resources_lists(struct acpi_device *device)
}
}
+static void acpi_free_swnodes(struct acpi_device *device)
+{
+ struct acpi_device_software_nodes *ads = device->swnodes;
+ struct fwnode_handle *primary;
+
+ if (!ads)
+ return;
+
+ software_node_unregister_node_group(ads->nodeptrs);
+ primary = acpi_fwnode_handle(device);
+ primary->secondary = NULL;
+ kfree(ads->nodes[ACPI_DEVICE_SWNODE_ROOT].name);
+ kfree(ads);
+
+ device->swnodes = NULL;
+}
+
static void acpi_device_release(struct device *dev)
{
struct acpi_device *acpi_dev = to_acpi_device(dev);
+ acpi_free_swnodes(acpi_dev);
acpi_free_properties(acpi_dev);
acpi_free_pnp_ids(&acpi_dev->pnp);
acpi_free_power_resources_lists(acpi_dev);
diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
index a05fe22c1175..e05d1c1f6ac2 100644
--- a/include/acpi/acpi_bus.h
+++ b/include/acpi/acpi_bus.h
@@ -360,15 +360,84 @@ struct acpi_device_data {
struct acpi_gpio_mapping;
+enum acpi_device_swnode_dev_props {
+ ACPI_DEVICE_SWNODE_DEV_NUM_OF,
+ ACPI_DEVICE_SWNODE_DEV_NUM_ENTRIES
+};
+
+enum acpi_device_swnode_port_props {
+ ACPI_DEVICE_SWNODE_PRT_REG,
+ ACPI_DEVICE_SWNODE_PRT_NUM_OF,
+ ACPI_DEVICE_SWNODE_PRT_NUM_ENTRIES
+};
+
+enum acpi_device_swnode_ep_props {
+ ACPI_DEVICE_SWNODE_EP_REMOTE_EP,
+ ACPI_DEVICE_SWNODE_EP_BUS_TYPE,
+ ACPI_DEVICE_SWNODE_EP_REG,
+ ACPI_DEVICE_SWNODE_EP_CLOCK_LANES,
+ ACPI_DEVICE_SWNODE_EP_DATA_LANES,
+ ACPI_DEVICE_SWNODE_EP_LANE_POLARITIES,
+ /* TX only */
+ ACPI_DEVICE_SWNODE_EP_LINK_FREQUENCIES,
+ ACPI_DEVICE_SWNODE_EP_NUM_OF,
+ ACPI_DEVICE_SWNODE_EP_NUM_ENTRIES
+};
+
+#define ACPI_DEVICE_SWNODE_ROOT 0
+/*
+ * Each device has a root swnode plus two times as many nodes as the
+ * number of CSI-2 ports.
+ */
+#define ACPI_DEVICE_SWNODE_PRT(port) (1 + 2 * (port))
+#define ACPI_DEVICE_SWNODE_EP(endpoint) \
+ (ACPI_DEVICE_SWNODE_PRT(endpoint) + 1)
+
+#define ACPI_DEVICE_SWNODE_CSI2_DATA_LANES 4
+
+/**
+ * struct acpi_device_software_node_port: Software nodes for MIPI DisCo for
+ * Imaging support
+ * @port_name: the name of the port
+ * @data_lanes: "data-lanes" property values
+ * @lane_polarities: "lane-polarities" property values
+ * @link_frequencies: "link_frequencies" property values
+ * @port_nr: the number of the port
+ * @crs_crs2_local: whether the _CRS CSI2 record is local to the port (i.e. the
+ * port is a transmitter port)
+ * port_props: the port properties
+ * ep_props: the endpoint properties
+ * remote_ep_ref: reference to the remote endpoint
+ */
struct acpi_device_software_node_port {
+ char port_name[8];
+ u32 data_lanes[ACPI_DEVICE_SWNODE_CSI2_DATA_LANES];
+ u32 lane_polarities[1 /* clock lane */ +
+ ACPI_DEVICE_SWNODE_CSI2_DATA_LANES];
+ u64 link_frequencies[4];
unsigned int port_nr;
+ bool crs_csi2_local;
+
+ struct property_entry port_props[ACPI_DEVICE_SWNODE_PRT_NUM_ENTRIES];
+ struct property_entry ep_props[ACPI_DEVICE_SWNODE_EP_NUM_ENTRIES];
+
+ struct software_node_ref_args remote_ep_ref[1];
};
+/**
+ * struct acpi_device_software_nodes - Software nodes for an ACPI device
+ * @ports: information related to each port and endpoint within a port
+ * @nodes: software nodes for root as well as ports and endpoints
+ * @nodeprts: array of software node pointers, for (un)registering them
+ * @num_ports: the number of ports
+ */
struct acpi_device_software_nodes {
struct acpi_device_software_node_port *ports;
struct software_node *nodes;
const struct software_node **nodeptrs;
unsigned int num_ports;
+
+ struct property_entry dev_props[ACPI_DEVICE_SWNODE_DEV_NUM_ENTRIES];
};
/* Device */
@@ -377,6 +446,7 @@ struct acpi_device {
int device_type;
acpi_handle handle; /* no handle for fixed hardware */
struct fwnode_handle fwnode;
+ struct acpi_device_software_nodes *swnodes;
struct list_head wakeup_list;
struct list_head del_list;
struct acpi_device_status status;
--
2.30.2
