[PATCH 05/19] soundwire: amd: add soundwire interrupt handling

From: Vijendar Mukunda
Date: Wed Jan 11 2023 - 04:00:59 EST

Add support for handling soundwire controller interrupts.

Signed-off-by: Vijendar Mukunda <Vijendar.Mukunda@xxxxxxx>
Signed-off-by: Mastan Katragadda <Mastan.Katragadda@xxxxxxx>
---
drivers/soundwire/amd_master.c | 156 ++++++++++++++++++++++++++++++
drivers/soundwire/amd_master.h | 1 +
include/linux/soundwire/sdw_amd.h | 3 +
3 files changed, 160 insertions(+)

diff --git a/drivers/soundwire/amd_master.c b/drivers/soundwire/amd_master.c
index 93bffe6ff9e2..c7063b8bdd7b 100644
--- a/drivers/soundwire/amd_master.c
+++ b/drivers/soundwire/amd_master.c
@@ -557,6 +557,47 @@ amd_reset_page_addr(struct sdw_bus *bus, unsigned int dev_num)
return amd_program_scp_addr(ctrl, &msg);
}

+static void amd_sdwc_process_ping_status(u64 response, struct amd_sdwc_ctrl *ctrl)
+{
+ u64 slave_stat = 0;
+ u32 val = 0;
+ u16 dev_index;
+
+ /* slave status from ping 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(ctrl->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(ctrl->dev, "%s val:0x%x\n", __func__, val);
+ switch (val) {
+ case SDW_SLAVE_ATTACHED:
+ ctrl->status[dev_index] = SDW_SLAVE_ATTACHED;
+ break;
+ case SDW_SLAVE_UNATTACHED:
+ ctrl->status[dev_index] = SDW_SLAVE_UNATTACHED;
+ break;
+ case SDW_SLAVE_ALERT:
+ ctrl->status[dev_index] = SDW_SLAVE_ALERT;
+ break;
+ default:
+ ctrl->status[dev_index] = SDW_SLAVE_RESERVED;
+ break;
+ }
+ }
+}
+
+static void amd_sdwc_read_and_process_ping_status(struct amd_sdwc_ctrl *ctrl)
+{
+ u64 response = 0;
+
+ mutex_lock(&ctrl->bus.msg_lock);
+ response = amd_sdwc_send_cmd_get_resp(ctrl, 0, 0);
+ mutex_unlock(&ctrl->bus.msg_lock);
+ amd_sdwc_process_ping_status(response, ctrl);
+}
+
static u32 amd_sdwc_read_ping_status(struct sdw_bus *bus)
{
struct amd_sdwc_ctrl *ctrl = to_amd_sdw(bus);
@@ -1132,6 +1173,119 @@ static int amd_sdwc_register_dais(struct amd_sdwc_ctrl *ctrl)
dais, num_dais);
}

+static void amd_sdwc_update_slave_status_work(struct work_struct *work)
+{
+ struct amd_sdwc_ctrl *ctrl =
+ container_of(work, struct amd_sdwc_ctrl, amd_sdw_work);
+ u32 sw_status_change_mask_0to7_reg;
+ u32 sw_status_change_mask_8to11_reg;
+
+ switch (ctrl->instance) {
+ case ACP_SDW0:
+ sw_status_change_mask_0to7_reg = SW_STATE_CHANGE_STATUS_MASK_0TO7;
+ sw_status_change_mask_8to11_reg = SW_STATE_CHANGE_STATUS_MASK_8TO11;
+ break;
+ case ACP_SDW1:
+ sw_status_change_mask_0to7_reg = P1_SW_STATE_CHANGE_STATUS_MASK_0TO7;
+ sw_status_change_mask_8to11_reg = P1_SW_STATE_CHANGE_STATUS_MASK_8TO11;
+ break;
+ default:
+ dev_err(ctrl->dev, "Invalid Soundwire controller instance\n");
+ return;
+ }
+
+ if (ctrl->status[0] == SDW_SLAVE_ATTACHED) {
+ acp_reg_writel(0, ctrl->mmio + sw_status_change_mask_0to7_reg);
+ acp_reg_writel(0, ctrl->mmio + sw_status_change_mask_8to11_reg);
+ }
+
+update_status:
+ sdw_handle_slave_status(&ctrl->bus, ctrl->status);
+ if (ctrl->status[0] == SDW_SLAVE_ATTACHED) {
+ acp_reg_writel(AMD_SDW_IRQ_MASK_0TO7, ctrl->mmio + sw_status_change_mask_0to7_reg);
+ acp_reg_writel(AMD_SDW_IRQ_MASK_8TO11,
+ ctrl->mmio + sw_status_change_mask_8to11_reg);
+ amd_sdwc_read_and_process_ping_status(ctrl);
+ goto update_status;
+ }
+}
+
+static void amd_sdwc_update_slave_status(u32 status_change_0to7, u32 status_change_8to11,
+ struct amd_sdwc_ctrl *ctrl)
+{
+ u64 slave_stat = 0;
+ u32 val = 0;
+ int dev_index;
+
+ if (status_change_0to7 == AMD_SDW_SLAVE_0_ATTACHED)
+ memset(ctrl->status, 0, sizeof(ctrl->status));
+ slave_stat = status_change_0to7;
+ slave_stat |= FIELD_GET(AMD_SDW_MCP_SLAVE_STATUS_8TO_11, status_change_8to11) << 32;
+ dev_dbg(ctrl->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:
+ ctrl->status[dev_index] = SDW_SLAVE_ATTACHED;
+ break;
+ case SDW_SLAVE_UNATTACHED:
+ ctrl->status[dev_index] = SDW_SLAVE_UNATTACHED;
+ break;
+ case SDW_SLAVE_ALERT:
+ ctrl->status[dev_index] = SDW_SLAVE_ALERT;
+ break;
+ default:
+ ctrl->status[dev_index] = SDW_SLAVE_RESERVED;
+ break;
+ }
+ }
+ }
+ }
+}
+
+static void amd_sdwc_irq_thread(struct work_struct *work)
+{
+ struct amd_sdwc_ctrl *ctrl =
+ container_of(work, struct amd_sdwc_ctrl, amd_sdw_irq_thread);
+ u32 sw_status_change_0to7_reg;
+ u32 sw_status_change_8to11_reg;
+ u32 status_change_8to11;
+ u32 status_change_0to7;
+
+ switch (ctrl->instance) {
+ case ACP_SDW0:
+ sw_status_change_0to7_reg = SW_STATE_CHANGE_STATUS_0TO7;
+ sw_status_change_8to11_reg = SW_STATE_CHANGE_STATUS_8TO11;
+ break;
+ case ACP_SDW1:
+ sw_status_change_0to7_reg = P1_SW_STATE_CHANGE_STATUS_0TO7;
+ sw_status_change_8to11_reg = P1_SW_STATE_CHANGE_STATUS_8TO11;
+ break;
+ default:
+ dev_err(ctrl->dev, "Invalid Soundwire controller instance\n");
+ return;
+ }
+
+ status_change_8to11 = acp_reg_readl(ctrl->mmio + sw_status_change_8to11_reg);
+ status_change_0to7 = acp_reg_readl(ctrl->mmio + sw_status_change_0to7_reg);
+ dev_dbg(ctrl->dev, "%s [SDW%d] SDW INT: 0to7=0x%x, 8to11=0x%x\n",
+ __func__, ctrl->instance, status_change_0to7, status_change_8to11);
+ if (status_change_8to11 & AMD_SDW_PREQ_INTR_STAT) {
+ amd_sdwc_read_and_process_ping_status(ctrl);
+ } else {
+ /* Check for the updated status on Slave device */
+ amd_sdwc_update_slave_status(status_change_0to7, status_change_8to11, ctrl);
+ }
+ if (status_change_8to11 || status_change_0to7)
+ schedule_work(&ctrl->amd_sdw_work);
+ acp_reg_writel(0x00, ctrl->mmio + sw_status_change_8to11_reg);
+ acp_reg_writel(0x00, ctrl->mmio + sw_status_change_0to7_reg);
+}
+
static void amd_sdwc_probe_work(struct work_struct *work)
{
struct amd_sdwc_ctrl *ctrl = container_of(work, struct amd_sdwc_ctrl, probe_work);
@@ -1229,6 +1383,8 @@ static int amd_sdwc_probe(struct platform_device *pdev)
sdw_bus_master_delete(&ctrl->bus);
return ret;
}
+ INIT_WORK(&ctrl->amd_sdw_irq_thread, amd_sdwc_irq_thread);
+ INIT_WORK(&ctrl->amd_sdw_work, amd_sdwc_update_slave_status_work);
INIT_WORK(&ctrl->probe_work, amd_sdwc_probe_work);
schedule_work(&ctrl->probe_work);
return 0;
diff --git a/drivers/soundwire/amd_master.h b/drivers/soundwire/amd_master.h
index 42f32ca0c7a8..b43a5d6496cb 100644
--- a/drivers/soundwire/amd_master.h
+++ b/drivers/soundwire/amd_master.h
@@ -236,6 +236,7 @@
#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_channel {
/* SDW0 */
diff --git a/include/linux/soundwire/sdw_amd.h b/include/linux/soundwire/sdw_amd.h
index 7a99d782969f..2db03b2f0c3b 100644
--- a/include/linux/soundwire/sdw_amd.h
+++ b/include/linux/soundwire/sdw_amd.h
@@ -24,9 +24,12 @@ struct amd_sdwc_ctrl {
struct sdw_bus bus;
struct device *dev;
void __iomem *mmio;
+ struct work_struct amd_sdw_irq_thread;
+ struct work_struct amd_sdw_work;
struct work_struct probe_work;
struct mutex *sdw_lock;
struct sdw_stream_runtime *sruntime[AMD_SDW_MAX_DAIS];
+ enum sdw_slave_status status[SDW_MAX_DEVICES + 1];
int num_din_ports;
int num_dout_ports;
int cols_index;
--
2.34.1