Qualcomm SoundWire controller supports Auto Enumeration of the devices within the IP. This patch enables support for this feature.
Signed-off-by: Srinivas Kandagatla srinivas.kandagatla@linaro.org --- drivers/soundwire/qcom.c | 84 +++++++++++++++++++++++++++++++++++++--- 1 file changed, 78 insertions(+), 6 deletions(-)
diff --git a/drivers/soundwire/qcom.c b/drivers/soundwire/qcom.c index 8438f9812d7c..d90eba6a1e88 100644 --- a/drivers/soundwire/qcom.c +++ b/drivers/soundwire/qcom.c @@ -57,6 +57,8 @@ #define SWRM_CMD_FIFO_RD_FIFO_ADDR 0x318 #define SWRM_RD_FIFO_CMD_ID_MASK GENMASK(11, 8) #define SWRM_ENUMERATOR_CFG_ADDR 0x500 +#define SWRM_ENUMERATOR_SLAVE_DEV_ID_1(m) (0x530 + 0x8 * (m)) +#define SWRM_ENUMERATOR_SLAVE_DEV_ID_2(m) (0x534 + 0x8 * (m)) #define SWRM_MCP_FRAME_CTRL_BANK_ADDR(m) (0x101C + 0x40 * (m)) #define SWRM_MCP_FRAME_CTRL_BANK_COL_CTRL_BMSK GENMASK(2, 0) #define SWRM_MCP_FRAME_CTRL_BANK_ROW_CTRL_BMSK GENMASK(7, 3) @@ -121,6 +123,7 @@ struct qcom_swrm_ctrl { struct regmap *regmap; void __iomem *mmio; struct completion broadcast; + struct completion enumeration; struct work_struct slave_work; /* Port alloc/free lock */ struct mutex port_lock; @@ -143,6 +146,7 @@ struct qcom_swrm_ctrl { enum sdw_slave_status status[SDW_MAX_DEVICES]; int (*reg_read)(struct qcom_swrm_ctrl *ctrl, int reg, u32 *val); int (*reg_write)(struct qcom_swrm_ctrl *ctrl, int reg, int val); + u32 slave_status; };
struct qcom_swrm_data { @@ -342,6 +346,7 @@ static void qcom_swrm_get_device_status(struct qcom_swrm_ctrl *ctrl) int i;
ctrl->reg_read(ctrl, SWRM_MCP_SLV_STATUS, &val); + ctrl->slave_status = val;
for (i = 0; i < SDW_MAX_DEVICES; i++) { u32 s; @@ -352,10 +357,66 @@ static void qcom_swrm_get_device_status(struct qcom_swrm_ctrl *ctrl) } }
+static int qcom_swrm_get_n_device_status(struct qcom_swrm_ctrl *ctrl, int devnum) +{ + u32 val; + + ctrl->reg_read(ctrl, SWRM_MCP_SLV_STATUS, &val); + val = (val >> (devnum * SWRM_MCP_SLV_STATUS_SZ)); + val &= SWRM_MCP_SLV_STATUS_MASK; + + return val; +} + +static int qcom_swrm_enumerate(struct sdw_bus *bus) +{ + struct qcom_swrm_ctrl *ctrl = to_qcom_sdw(bus); + struct sdw_slave *slave, *_s; + struct sdw_slave_id id; + u32 val1, val2; + u64 addr; + int i; + char *buf1 = (char *)&val1, *buf2 = (char *)&val2; + + for (i = 1; i < (SDW_MAX_DEVICES + 1); i++) { + /*SCP_Devid5 - Devid 4*/ + ctrl->reg_read(ctrl, SWRM_ENUMERATOR_SLAVE_DEV_ID_1(i), &val1); + + /*SCP_Devid3 - DevId 2 Devid 1 Devid 0*/ + ctrl->reg_read(ctrl, SWRM_ENUMERATOR_SLAVE_DEV_ID_2(i), &val2); + + if (!val1 && !val2) + break; + + addr = buf2[1] | (buf2[0] << 8) | (buf1[3] << 16) | + ((u64)buf1[2] << 24) | ((u64)buf1[1] << 32) | + ((u64)buf1[0] << 40); + + sdw_extract_slave_id(bus, addr, &id); + /* Now compare with entries */ + list_for_each_entry_safe(slave, _s, &bus->slaves, node) { + if (sdw_compare_devid(slave, id) == 0) { + u32 status = qcom_swrm_get_n_device_status(ctrl, i); + if (status == SDW_SLAVE_ATTACHED) { + slave->dev_num = i; + mutex_lock(&bus->bus_lock); + set_bit(i, bus->assigned); + mutex_unlock(&bus->bus_lock); + + } + break; + } + } + } + + complete(&ctrl->enumeration); + return 0; +} + static irqreturn_t qcom_swrm_irq_handler(int irq, void *dev_id) { struct qcom_swrm_ctrl *swrm = dev_id; - u32 value, intr_sts, intr_sts_masked; + u32 value, intr_sts, intr_sts_masked, slave_status; u32 i; u8 devnum = 0; int ret = IRQ_HANDLED; @@ -382,10 +443,19 @@ static irqreturn_t qcom_swrm_irq_handler(int irq, void *dev_id) break; case SWRM_INTERRUPT_STATUS_NEW_SLAVE_ATTACHED: case SWRM_INTERRUPT_STATUS_CHANGE_ENUM_SLAVE_STATUS: - dev_err_ratelimited(swrm->dev, "%s: SWR new slave attached\n", + dev_err_ratelimited(swrm->dev, "%s: SWR slave status changed\n", __func__); - qcom_swrm_get_device_status(swrm); - sdw_handle_slave_status(&swrm->bus, swrm->status); + swrm->reg_read(swrm, SWRM_MCP_SLV_STATUS, &slave_status); + if (swrm->slave_status == slave_status) { + dev_err(swrm->dev, "Slave status not changed %x\n", + slave_status); + break; + } else { + dev_err(swrm->dev, "Slave status handle %x\n", slave_status); + qcom_swrm_get_device_status(swrm); + qcom_swrm_enumerate(&swrm->bus); + sdw_handle_slave_status(&swrm->bus, swrm->status); + } break; case SWRM_INTERRUPT_STATUS_MASTER_CLASH_DET: dev_err_ratelimited(swrm->dev, @@ -472,8 +542,8 @@ static int qcom_swrm_init(struct qcom_swrm_ctrl *ctrl)
ctrl->reg_write(ctrl, SWRM_MCP_FRAME_CTRL_BANK_ADDR(0), val);
- /* Disable Auto enumeration */ - ctrl->reg_write(ctrl, SWRM_ENUMERATOR_CFG_ADDR, 0); + /* Enable Auto enumeration */ + ctrl->reg_write(ctrl, SWRM_ENUMERATOR_CFG_ADDR, 1);
ctrl->intr_mask = SWRM_INTERRUPT_STATUS_RMSK; /* Mask soundwire interrupts */ @@ -507,6 +577,7 @@ static int qcom_swrm_init(struct qcom_swrm_ctrl *ctrl) ctrl->reg_write(ctrl, SWRM_INTERRUPT_CPU_EN, SWRM_INTERRUPT_STATUS_RMSK); } + ctrl->slave_status = 0; return 0; }
@@ -1068,6 +1139,7 @@ static int qcom_swrm_probe(struct platform_device *pdev) dev_set_drvdata(&pdev->dev, ctrl); mutex_init(&ctrl->port_lock); init_completion(&ctrl->broadcast); + init_completion(&ctrl->enumeration);
ctrl->bus.ops = &qcom_swrm_ops; ctrl->bus.port_ops = &qcom_swrm_port_ops;