@@ -17,6 +17,7 @@
#include <linux/mailbox_client.h>
#include <linux/module.h>
#include <linux/of_device.h>
+#include <linux/of_reserved_mem.h>
#include <linux/semaphore.h>
#include <linux/slab.h>
#include <linux/soc/ti/ti-msgmgr.h>
@@ -96,6 +97,8 @@ struct ti_sci_desc {
* @minfo: Message info
* @node: list head
* @host_id: Host ID
+ * @mem_ctx_lo: Low word of address used for low power context memory
+ * @mem_ctx_hi: High word of address used for low power context memory
* @users: Number of users of this instance
* @is_suspending: Flag set to indicate in suspend path.
*/
@@ -114,6 +117,8 @@ struct ti_sci_info {
struct ti_sci_xfers_info minfo;
struct list_head node;
u8 host_id;
+ u32 mem_ctx_lo;
+ u32 mem_ctx_hi;
/* protected by ti_sci_list_mutex */
int users;
bool is_suspending;
@@ -3374,6 +3379,29 @@ static int ti_sci_resume(struct device *dev)
static DEFINE_SIMPLE_DEV_PM_OPS(ti_sci_pm_ops, ti_sci_suspend, ti_sci_resume);
+static int ti_sci_init_suspend(struct platform_device *pdev, struct ti_sci_info *info)
+{
+ struct device *dev = &pdev->dev;
+ struct device_node *rmem_np;
+ struct reserved_mem *rmem;
+
+ rmem_np = of_parse_phandle(dev->of_node, "ti,ctx-memory-region", 0);
+ if (!rmem_np) {
+ dev_warn(dev, "ti,ctx-memory-region is required for suspend but not provided.\n");
+ return -EINVAL;
+ }
+
+ rmem = of_reserved_mem_lookup(rmem_np);
+ of_node_put(rmem_np);
+ if (!rmem)
+ return -EINVAL;
+
+ info->mem_ctx_lo = (rmem->base & 0xFFFFFFFF);
+ info->mem_ctx_hi = (rmem->base >> 32);
+
+ return 0;
+}
+
/* Description for K2G */
static const struct ti_sci_desc ti_sci_pmmc_k2g_desc = {
.default_host_id = 2,
@@ -3526,6 +3554,23 @@ static int ti_sci_probe(struct platform_device *pdev)
}
}
+ /*
+ * Attempt to call prepare_sleep, this will be NAK'd if suspend is not
+ * supported by firmware in use, in which case we will not attempt to
+ * init suspend.
+ */
+ ret = ti_sci_cmd_prepare_sleep(&info->handle, 0, info->mem_ctx_lo,
+ info->mem_ctx_hi, 0);
+ if (!ret) {
+ ret = ti_sci_init_suspend(pdev, info);
+ if (ret)
+ dev_warn(dev,
+ "ti_sci_init_suspend failed, mem suspend will be non-functional.\n");
+ }
+
+ /* Suspend is an optional feature, reset return value and continue. */
+ ret = 0;
+
dev_info(dev, "ABI: %d.%d (firmware rev 0x%04x '%s')\n",
info->handle.version.abi_major, info->handle.version.abi_minor,
info->handle.version.firmware_revision,
A reserved memory region in DDR must be used during low power modes for saving of some system context when using the ti_sci firmware, so introduce a property to allow providing this in the device tree so that it can be read and shared with the firmware. Also send a TISCI_MSG_PREPARE_SUSPEND message to the firmware during probe to determine if system suspend is supported and if ti_sci_init_suspend should be called based on the response received. Signed-off-by: Dave Gerlach <d-gerlach@ti.com> --- drivers/firmware/ti_sci.c | 45 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 45 insertions(+)