[PATCH V2 5/8] soundwire: amd: add soundwire manager interrupt handling

Vijendar Mukunda
2023-02-13T09:41:17Z

Add support for handling soundwire manager interrupts.

Signed-off-by: Vijendar Mukunda <Vijendar.Mukunda@amd.com>
Signed-off-by: Mastan Katragadda <Mastan.Katragadda@amd.com>
---
drivers/soundwire/amd_manager.c | 132 ++++++++++++++++++++++++++++++
drivers/soundwire/amd_manager.h | 1 +
include/linux/soundwire/sdw_amd.h | 7 ++
3 files changed, 140 insertions(+)

diff --git a/drivers/soundwire/amd_manager.c b/drivers/soundwire/amd_manager.c
index 14c88b80ab6d..87f9a987d93a 100644
--- a/drivers/soundwire/amd_manager.c
+++ b/drivers/soundwire/amd_manager.c
@@ -417,6 +417,47 @@ static enum sdw_command_response amd_sdw_xfer_msg(struct sdw_bus *bus, struct sd
return SDW_CMD_OK;
}

+static void amd_sdw_process_ping_status(u64 response, struct amd_sdw_manager *amd_manager)
+{
+ u64 slave_stat = 0;
+ u32 val = 0;
+ u16 dev_index;
+
+ /* slave status response*/
+ slave_stat = FIELD_GET(AMD_SDW_MCP_SLAVE_STAT_0_3, response);
+ slave_stat |= FIELD_GET(AMD_SDW_MCP_SLAVE_STAT_4_11, response) << 8;
+
+ dev_dbg(amd_manager->dev, "%s: slave_stat:0x%llx\n", __func__, slave_stat);
+ for (dev_index = 0; dev_index <= SDW_MAX_DEVICES; ++dev_index) {
+ val = (slave_stat >> (dev_index * 2)) & AMD_SDW_MCP_SLAVE_STATUS_MASK;
+ dev_dbg(amd_manager->dev, "%s val:0x%x\n", __func__, val);
+ switch (val) {
+ case SDW_SLAVE_ATTACHED:
+ amd_manager->status[dev_index] = SDW_SLAVE_ATTACHED;
+ break;
+ case SDW_SLAVE_UNATTACHED:
+ amd_manager->status[dev_index] = SDW_SLAVE_UNATTACHED;
+ break;
+ case SDW_SLAVE_ALERT:
+ amd_manager->status[dev_index] = SDW_SLAVE_ALERT;
+ break;
+ default:
+ amd_manager->status[dev_index] = SDW_SLAVE_RESERVED;
+ break;
+ }
+ }
+}
+
+static void amd_sdw_read_and_process_ping_status(struct amd_sdw_manager *amd_manager)
+{
+ u64 response = 0;
+
+ mutex_lock(&amd_manager->bus.msg_lock);
+ response = amd_sdw_send_cmd_get_resp(amd_manager, 0, 0);
+ mutex_unlock(&amd_manager->bus.msg_lock);
+ amd_sdw_process_ping_status(response, amd_manager);
+}
+
static u32 amd_sdw_read_ping_status(struct sdw_bus *bus)
{
struct amd_sdw_manager *amd_manager = to_amd_sdw(bus);
@@ -817,6 +858,95 @@ static int amd_sdw_register_dais(struct amd_sdw_manager *amd_manager)
dais, num_dais);
}

+static void amd_sdw_update_slave_status_work(struct work_struct *work)
+{
+ struct amd_sdw_manager *amd_manager =
+ container_of(work, struct amd_sdw_manager, amd_sdw_work);
+ int retry_count = 0;
+
+ if (amd_manager->status[0] == SDW_SLAVE_ATTACHED) {
+ acp_reg_writel(0, amd_manager->mmio + ACP_SW_STATE_CHANGE_STATUS_MASK_0TO7);
+ acp_reg_writel(0, amd_manager->mmio + ACP_SW_STATE_CHANGE_STATUS_MASK_8TO11);
+ }
+
+update_status:
+ sdw_handle_slave_status(&amd_manager->bus, amd_manager->status);
+ if (amd_manager->status[0] == SDW_SLAVE_ATTACHED) {
+ if (retry_count++ < SDW_MAX_DEVICES) {
+ acp_reg_writel(AMD_SDW_IRQ_MASK_0TO7, amd_manager->mmio +
+ ACP_SW_STATE_CHANGE_STATUS_MASK_0TO7);
+ acp_reg_writel(AMD_SDW_IRQ_MASK_8TO11,
+ amd_manager->mmio + ACP_SW_STATE_CHANGE_STATUS_MASK_8TO11);
+ amd_sdw_read_and_process_ping_status(amd_manager);
+ goto update_status;
+ } else {
+ dev_err_ratelimited(amd_manager->dev,
+ "Device0 detected after %d iterations\n",
+ retry_count);
+ }
+ }
+}
+
+static void amd_sdw_update_slave_status(u32 status_change_0to7, u32 status_change_8to11,
+ struct amd_sdw_manager *amd_manager)
+{
+ u64 slave_stat = 0;
+ u32 val = 0;
+ int dev_index;
+
+ if (status_change_0to7 == AMD_SDW_SLAVE_0_ATTACHED)
+ memset(amd_manager->status, 0, sizeof(amd_manager->status));
+ slave_stat = status_change_0to7;
+ slave_stat |= FIELD_GET(AMD_SDW_MCP_SLAVE_STATUS_8TO_11, status_change_8to11) << 32;
+ dev_dbg(amd_manager->dev, "%s: status_change_0to7:0x%x status_change_8to11:0x%x\n",
+ __func__, status_change_0to7, status_change_8to11);
+ if (slave_stat) {
+ for (dev_index = 0; dev_index <= SDW_MAX_DEVICES; ++dev_index) {
+ if (slave_stat & AMD_SDW_MCP_SLAVE_STATUS_VALID_MASK(dev_index)) {
+ val = (slave_stat >> AMD_SDW_MCP_SLAVE_STAT_SHIFT_MASK(dev_index)) &
+ AMD_SDW_MCP_SLAVE_STATUS_MASK;
+ switch (val) {
+ case SDW_SLAVE_ATTACHED:
+ amd_manager->status[dev_index] = SDW_SLAVE_ATTACHED;
+ break;
+ case SDW_SLAVE_UNATTACHED:
+ amd_manager->status[dev_index] = SDW_SLAVE_UNATTACHED;
+ break;
+ case SDW_SLAVE_ALERT:
+ amd_manager->status[dev_index] = SDW_SLAVE_ALERT;
+ break;
+ default:
+ amd_manager->status[dev_index] = SDW_SLAVE_RESERVED;
+ break;
+ }
+ }
+ }
+ }
+}
+
+static void amd_sdw_irq_thread(struct work_struct *work)
+{
+ struct amd_sdw_manager *amd_manager =
+ container_of(work, struct amd_sdw_manager, amd_sdw_irq_thread);
+ u32 status_change_8to11;
+ u32 status_change_0to7;
+
+ status_change_8to11 = acp_reg_readl(amd_manager->mmio + ACP_SW_STATE_CHANGE_STATUS_8TO11);
+ status_change_0to7 = acp_reg_readl(amd_manager->mmio + ACP_SW_STATE_CHANGE_STATUS_0TO7);
+ dev_dbg(amd_manager->dev, "%s [SDW%d] SDW INT: 0to7=0x%x, 8to11=0x%x\n",
+ __func__, amd_manager->instance, status_change_0to7, status_change_8to11);
+ if (status_change_8to11 & AMD_SDW_PREQ_INTR_STAT) {
+ amd_sdw_read_and_process_ping_status(amd_manager);
+ } else {
+ /* Check for the updated status on peripheral device */
+ amd_sdw_update_slave_status(status_change_0to7, status_change_8to11, amd_manager);
+ }
+ if (status_change_8to11 || status_change_0to7)
+ schedule_work(&amd_manager->amd_sdw_work);
+ acp_reg_writel(0x00, amd_manager->mmio + ACP_SW_STATE_CHANGE_STATUS_8TO11);
+ acp_reg_writel(0x00, amd_manager->mmio + ACP_SW_STATE_CHANGE_STATUS_0TO7);
+}
+
static void amd_sdw_probe_work(struct work_struct *work)
{
struct amd_sdw_manager *amd_manager = container_of(work, struct amd_sdw_manager,
@@ -909,6 +1039,8 @@ static int amd_sdw_manager_probe(struct platform_device *pdev)
return ret;
}
dev_set_drvdata(dev, amd_manager);
+ INIT_WORK(&amd_manager->amd_sdw_irq_thread, amd_sdw_irq_thread);
+ INIT_WORK(&amd_manager->amd_sdw_work, amd_sdw_update_slave_status_work);
INIT_WORK(&amd_manager->probe_work, amd_sdw_probe_work);
schedule_work(&amd_manager->probe_work);
return 0;
diff --git a/drivers/soundwire/amd_manager.h b/drivers/soundwire/amd_manager.h
index 3e1bded1e769..5bcaf7a763bb 100644
--- a/drivers/soundwire/amd_manager.h
+++ b/drivers/soundwire/amd_manager.h
@@ -186,6 +186,7 @@
#define AMD_SDW1_PAD_KEEPER_EN_MASK 0x10
#define AMD_SDW0_PAD_KEEPER_DISABLE_MASK 0x1E
#define AMD_SDW1_PAD_KEEPER_DISABLE_MASK 0xF
+#define AMD_SDW_PREQ_INTR_STAT BIT(19)

enum amd_sdw_cmd_type {
AMD_SDW_CMD_PING = 0,
diff --git a/include/linux/soundwire/sdw_amd.h b/include/linux/soundwire/sdw_amd.h
index c978cfbc0207..003b8a197fc5 100644
--- a/include/linux/soundwire/sdw_amd.h
+++ b/include/linux/soundwire/sdw_amd.h
@@ -45,8 +45,11 @@ struct sdw_amd_dai_runtime {
* @mmio: soundwire registers mmio base
* @acp_mmio: acp registers mmio base
* @reg_mask: register mask structure per manager instance
+ * @amd_sdw_irq_thread: soundwire manager irq workqueue
+ * @amd_sdw_work: peripheral status work queue
* @probe_work: soundwire manager probe workqueue
* @sdw_lock: mutex to protect acp share register access
+ * @status: peripheral devices status array
* @num_din_ports: number of input ports
* @num_dout_ports: number of output ports
* @cols_index: Column index in frame shape
@@ -65,10 +68,14 @@ struct amd_sdw_manager {
void __iomem *acp_mmio;

struct sdw_manager_reg_mask *reg_mask;
+ struct work_struct amd_sdw_irq_thread;
+ struct work_struct amd_sdw_work;
struct work_struct probe_work;
/* mutex to protect acp common register access */
struct mutex *sdw_lock;

+ enum sdw_slave_status status[SDW_MAX_DEVICES + 1];
+
int num_din_ports;
int num_dout_ports;

--
2.34.1