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Subject[PATCH V5 5/5] LPC: Add the ACPI LPC support
Date
The patch update the _CRS of LPC children with the system logical I/O resource
after the translation from LPC-local I/O. Then the ACPI platform device
enumeration for LPC can apply the right I/O resource to request the system I/O
space.

Signed-off-by: zhichang.yuan <yuanzhichang@hisilicon.com>
---
drivers/bus/hisi_lpc.c | 26 ++++++
include/linux/extio.h | 4 +
lib/extio.c | 228 +++++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 258 insertions(+)

diff --git a/drivers/bus/hisi_lpc.c b/drivers/bus/hisi_lpc.c
index a96e384..8d52666 100644
--- a/drivers/bus/hisi_lpc.c
+++ b/drivers/bus/hisi_lpc.c
@@ -583,6 +583,32 @@ static int hisilpc_bus_platform_notify(struct notifier_block *nb,
/* register the linux virtual IO range node to list. */
register_extio(io_node);

+ /*
+ * For ACPI children, translate the bus-local I/O range to logical
+ * I/O range and set it as the current resource before the children
+ * are enumerated.
+ */
+ if (has_acpi_companion(dev)) {
+ struct acpi_device *root, *child;
+
+ root = to_acpi_device_node(dev->fwnode);
+ /* For hisilpc, only care about the sons of host. */
+ list_for_each_entry(child, &root->children, node) {
+ ret = acpi_set_extio_resource(child, root);
+ if (ret) {
+ dev_err(dev, "set resource failed..\n");
+ break;
+ }
+ }
+
+ if (ret) {
+ list_del(&io_node->list);
+ kfree(io_node);
+ dev_err(dev, "notify handling failed..\n");
+ return NOTIFY_DONE;
+ }
+ }
+
return NOTIFY_OK;
}

diff --git a/include/linux/extio.h b/include/linux/extio.h
index 2ca7eab..c07607e 100644
--- a/include/linux/extio.h
+++ b/include/linux/extio.h
@@ -20,6 +20,7 @@

#ifdef __KERNEL__

+#include <linux/acpi.h>
#include <linux/fwnode.h>

struct extio_ops {
@@ -81,5 +82,8 @@ static inline struct extio_node *extio_find_node(struct fwnode_handle *node)
#endif
extern void register_extio(struct extio_node *node);

+extern int acpi_set_extio_resource(struct acpi_device *adev,
+ struct acpi_device *host);
+
#endif /* __KERNEL__ */
#endif /* __LINUX_EXTIO_H */
diff --git a/lib/extio.c b/lib/extio.c
index 46228de..47f5913 100644
--- a/lib/extio.c
+++ b/lib/extio.c
@@ -75,6 +75,234 @@ unsigned long extio_translate(struct fwnode_handle *node,
return port_id;
}

+static inline bool acpi_extio_supported_resource(struct acpi_resource *res)
+{
+ switch (res->type) {
+ case ACPI_RESOURCE_TYPE_ADDRESS16:
+ case ACPI_RESOURCE_TYPE_ADDRESS32:
+ case ACPI_RESOURCE_TYPE_ADDRESS64:
+ return true;
+ }
+ return false;
+}
+
+static acpi_status acpi_count_extiores(struct acpi_resource *res,
+ void *data)
+{
+ int *res_cnt = data;
+
+ if (acpi_extio_supported_resource(res) &&
+ !acpi_dev_filter_resource_type(res, IORESOURCE_IO))
+ (*res_cnt)++;
+
+ return AE_OK;
+}
+
+static acpi_status acpi_read_one_extiores(struct acpi_resource *res,
+ void *data)
+{
+ struct acpi_resource **resource = data;
+
+ if (acpi_extio_supported_resource(res) &&
+ !acpi_dev_filter_resource_type(res, IORESOURCE_IO)) {
+ memcpy((*resource), res, sizeof(struct acpi_resource));
+ (*resource)->length = sizeof(struct acpi_resource);
+ (*resource)->type = res->type;
+ (*resource)++;
+ }
+
+ return AE_OK;
+}
+
+static acpi_status
+acpi_build_extiores_template(struct acpi_device *adev,
+ struct acpi_buffer *buffer)
+{
+ acpi_handle handle = adev->handle;
+ struct acpi_resource *resource;
+ acpi_status status;
+ int res_cnt = 0;
+
+ status = acpi_walk_resources(handle, METHOD_NAME__PRS,
+ acpi_count_extiores, &res_cnt);
+ if (ACPI_FAILURE(status) || !res_cnt) {
+ dev_err(&adev->dev, "can't evaluate _CRS: %d\n", status);
+ return -EINVAL;
+ }
+
+ buffer->length = sizeof(struct acpi_resource) * (res_cnt + 1) + 1;
+ buffer->pointer = kzalloc(buffer->length - 1, GFP_KERNEL);
+ if (!buffer->pointer)
+ return -ENOMEM;
+
+ resource = (struct acpi_resource *)buffer->pointer;
+ status = acpi_walk_resources(handle, METHOD_NAME__PRS,
+ acpi_read_one_extiores, &resource);
+ if (ACPI_FAILURE(status)) {
+ kfree(buffer->pointer);
+ dev_err(&adev->dev, "can't evaluate _PRS: %d\n", status);
+ return -EINVAL;
+ }
+
+ resource->type = ACPI_RESOURCE_TYPE_END_TAG;
+ resource->length = sizeof(struct acpi_resource);
+
+ return 0;
+}
+
+static int acpi_translate_extiores(struct acpi_device *adev,
+ struct acpi_device *host, struct acpi_buffer *buffer)
+{
+ int res_cnt = (buffer->length - 1) / sizeof(struct acpi_resource) - 1;
+ struct acpi_resource *resource = buffer->pointer;
+ struct acpi_resource_address64 addr;
+ unsigned long sys_port;
+ struct device *dev = &adev->dev;
+
+ /* only one I/O resource now */
+ if (res_cnt != 1) {
+ dev_err(dev, "encode %d resources whose type is(%d)!\n",
+ res_cnt, resource->type);
+ return -EINVAL;
+ }
+
+ if (ACPI_FAILURE(acpi_resource_to_address64(resource, &addr))) {
+ dev_err(dev, "convert acpi resource(%d) as addr64 FAIL!\n",
+ resource->type);
+ return -EFAULT;
+ }
+
+ /* For indirect-IO, addr length must be fixed. (>0, 0, 0) */
+ if (!addr.address.address_length || addr.min_address_fixed ||
+ addr.max_address_fixed) {
+ dev_warn(dev, "variable I/O resource is invalid!\n");
+ return -EINVAL;
+ }
+
+ sys_port = extio_translate(&host->fwnode, addr.address.minimum);
+ if (sys_port == -1) {
+ dev_err(dev, "translate bus-addr(0x%llx) fail!\n",
+ addr.address.minimum);
+ return -EFAULT;
+ }
+
+ switch (resource->type) {
+ case ACPI_RESOURCE_TYPE_ADDRESS16:
+ {
+ struct acpi_resource_address16 *out_res;
+
+ out_res = &resource->data.address16;
+ out_res->address.minimum = sys_port;
+ out_res->address.maximum = sys_port +
+ addr.address.address_length - 1;
+
+ dev_info(dev, "_SRS 16IO: [0x%x - 0x%x]\n",
+ out_res->address.minimum,
+ out_res->address.maximum);
+
+ break;
+ }
+
+ case ACPI_RESOURCE_TYPE_ADDRESS32:
+ {
+ struct acpi_resource_address32 *out_res;
+
+ out_res = &resource->data.address32;
+ out_res->address.minimum = sys_port;
+ out_res->address.maximum = sys_port +
+ addr.address.address_length - 1;
+
+ dev_info(dev, "_SRS 32IO: [0x%x - 0x%x]\n",
+ out_res->address.minimum,
+ out_res->address.maximum);
+
+ break;
+ }
+
+ case ACPI_RESOURCE_TYPE_ADDRESS64:
+ {
+ struct acpi_resource_address64 *out_res;
+
+ out_res = &resource->data.address64;
+ out_res->address.minimum = sys_port;
+ out_res->address.maximum = sys_port +
+ addr.address.address_length - 1;
+
+ dev_info(dev, "_SRS 64IO: [0x%llx - 0x%llx]\n",
+ out_res->address.minimum,
+ out_res->address.maximum);
+
+ break;
+ }
+
+ default:
+ return -EINVAL;
+
+ }
+
+ return 0;
+}
+
+/*
+ * update/set the current I/O resource of the designated device node.
+ * after this calling, the enumeration can be started as the I/O resource
+ * had been translated to logicial I/O from bus-local I/O.
+ *
+ * @adev: the device node to be updated the I/O resource;
+ * @host: the device node where 'adev' is attached, which can be not
+ * the parent of 'adev';
+ *
+ * return 0 when successful, negative is for failure.
+ */
+int acpi_set_extio_resource(struct acpi_device *adev,
+ struct acpi_device *host)
+{
+ struct device *dev = &adev->dev;
+ struct acpi_buffer buffer;
+ acpi_status status;
+ int ret;
+
+ if (!host)
+ return -EINVAL;
+
+ /* check the device state */
+ if (!adev->status.present) {
+ dev_info(dev, "ACPI: device is not present!\n");
+ return 0;
+ }
+ /* whether the child had been enumerated? */
+ if (acpi_device_enumerated(adev)) {
+ dev_info(dev, "ACPI: had been enumerated!\n");
+ return 0;
+ }
+
+ /* read the _PRS and convert as acpi_buffer */
+ status = acpi_build_extiores_template(adev, &buffer);
+ if (ACPI_FAILURE(status)) {
+ dev_warn(dev, "Failure evaluating %s\n",
+ METHOD_NAME__PRS);
+ return -ENODEV;
+ }
+
+ /* translate the I/O resources */
+ ret = acpi_translate_extiores(adev, host, &buffer);
+ if (ret) {
+ kfree(buffer.pointer);
+ dev_err(dev, "Translate I/O range FAIL!\n");
+ return ret;
+ }
+
+ /* set current resource... */
+ status = acpi_set_current_resources(adev->handle, &buffer);
+ kfree(buffer.pointer);
+ if (ACPI_FAILURE(status)) {
+ dev_err(dev, "Error evaluating _SRS (0x%x)\n", status);
+ ret = -EIO;
+ }
+
+ return ret;
+}
+
#ifdef PCI_IOBASE

#define BUILD_EXTIO(bw, type) \
--
1.9.1
\
 
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