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SubjectRe: [PATCH V5 5/5] LPC: Add the ACPI LPC support
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Date
+ linux-acpi

Adding linux-acpi list, which should have been originally included.

The patchset threads have had much discussion, here is a pointer:
http://www.spinics.net/lists/devicetree/msg160611.html

John

On 24/01/2017 07:05, zhichang.yuan wrote:
> 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) \
>


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