[RFC PATCH 6/6] soundwire: qcom: add support for SoundWire controller

From: Srinivas Kandagatla
Date: Fri Jun 07 2019 - 05:01:31 EST

Qualcomm SoundWire Master controller is present in most Qualcomm SoCs
either integrated as part of WCD audio codecs via slimbus or
as part of SOC I/O.

This patchset adds support to a very basic controller which has been
tested with WCD934x SoundWire controller connected to WSA881x smart
speaker amplifiers.

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@xxxxxxxxxx>
---
drivers/soundwire/Kconfig | 9 +
drivers/soundwire/Makefile | 4 +
drivers/soundwire/qcom.c | 983 +++++++++++++++++++++++++++++++++++++
3 files changed, 996 insertions(+)
create mode 100644 drivers/soundwire/qcom.c

diff --git a/drivers/soundwire/Kconfig b/drivers/soundwire/Kconfig
index 53b55b79c4af..f44d4f36dbbb 100644
--- a/drivers/soundwire/Kconfig
+++ b/drivers/soundwire/Kconfig
@@ -34,4 +34,13 @@ config SOUNDWIRE_INTEL
enable this config option to get the SoundWire support for that
device.

+config SOUNDWIRE_QCOM
+ tristate "Qualcomm SoundWire Master driver"
+ select SOUNDWIRE_BUS
+ depends on SND_SOC
+ help
+ SoundWire Qualcomm Master driver.
+ If you have an Qualcomm platform which has a SoundWire Master then
+ enable this config option to get the SoundWire support for that
+ device
endif
diff --git a/drivers/soundwire/Makefile b/drivers/soundwire/Makefile
index 5817beaca0e1..f4ebfde31372 100644
--- a/drivers/soundwire/Makefile
+++ b/drivers/soundwire/Makefile
@@ -16,3 +16,7 @@ obj-$(CONFIG_SOUNDWIRE_INTEL) += soundwire-intel.o

soundwire-intel-init-objs := intel_init.o
obj-$(CONFIG_SOUNDWIRE_INTEL) += soundwire-intel-init.o
+
+#Qualcomm driver
+soundwire-qcom-objs := qcom.o
+obj-$(CONFIG_SOUNDWIRE_QCOM) += soundwire-qcom.o
diff --git a/drivers/soundwire/qcom.c b/drivers/soundwire/qcom.c
new file mode 100644
index 000000000000..d1722d44d217
--- /dev/null
+++ b/drivers/soundwire/qcom.c
@@ -0,0 +1,983 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (c) 2019, Linaro Limited
+
+#include <linux/clk.h>
+#include <linux/completion.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+#include <linux/slimbus.h>
+#include <linux/soundwire/sdw.h>
+#include <linux/soundwire/sdw_registers.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+#include "bus.h"
+
+#define SWRM_COMP_HW_VERSION 0x00
+#define SWRM_COMP_CFG_ADDR 0x04
+#define SWRM_COMP_CFG_IRQ_LEVEL_OR_PULSE_MSK BIT(1)
+#define SWRM_COMP_CFG_ENABLE_MSK BIT(0)
+#define SWRM_COMP_PARAMS 0x100
+#define SWRM_COMP_PARAMS_DOUT_PORTS_MASK GENMASK(4, 0)
+#define SWRM_COMP_PARAMS_DIN_PORTS_MASK GENMASK(9, 5)
+#define SWRM_COMP_PARAMS_WR_FIFO_DEPTH GENMASK(14, 10)
+#define SWRM_COMP_PARAMS_RD_FIFO_DEPTH GENMASK(19, 15)
+#define SWRM_COMP_PARAMS_AUTO_ENUM_SLAVES GENMASK(32. 20)
+#define SWRM_INTERRUPT_STATUS 0x200
+#define SWRM_INTERRUPT_STATUS_RMSK GENMASK(16, 0)
+#define SWRM_INTERRUPT_STATUS_SLAVE_PEND_IRQ BIT(0)
+#define SWRM_INTERRUPT_STATUS_NEW_SLAVE_ATTACHED BIT(1)
+#define SWRM_INTERRUPT_STATUS_CHANGE_ENUM_SLAVE_STATUS BIT(2)
+#define SWRM_INTERRUPT_STATUS_MASTER_CLASH_DET BIT(3)
+#define SWRM_INTERRUPT_STATUS_RD_FIFO_OVERFLOW BIT(4)
+#define SWRM_INTERRUPT_STATUS_RD_FIFO_UNDERFLOW BIT(5)
+#define SWRM_INTERRUPT_STATUS_WR_CMD_FIFO_OVERFLOW BIT(6)
+#define SWRM_INTERRUPT_STATUS_CMD_ERROR BIT(7)
+#define SWRM_INTERRUPT_STATUS_DOUT_PORT_COLLISION BIT(8)
+#define SWRM_INTERRUPT_STATUS_READ_EN_RD_VALID_MISMATCH BIT(9)
+#define SWRM_INTERRUPT_STATUS_SPECIAL_CMD_ID_FINISHED BIT(10)
+#define SWRM_INTERRUPT_STATUS_NEW_SLAVE_AUTO_ENUM_FINISHED BIT(11)
+#define SWRM_INTERRUPT_STATUS_AUTO_ENUM_FAILED BIT(12)
+#define SWRM_INTERRUPT_STATUS_AUTO_ENUM_TABLE_IS_FULL BIT(13)
+#define SWRM_INTERRUPT_STATUS_BUS_RESET_FINISHED BIT(14)
+#define SWRM_INTERRUPT_STATUS_CLK_STOP_FINISHED BIT(15)
+#define SWRM_INTERRUPT_STATUS_ERROR_PORT_TEST BIT(16)
+#define SWRM_INTERRUPT_MASK_ADDR 0x204
+#define SWRM_INTERRUPT_CLEAR 0x208
+#define SWRM_CMD_FIFO_WR_CMD 0x300
+#define SWRM_CMD_FIFO_RD_CMD 0x304
+#define SWRM_CMD_FIFO_CMD 0x308
+#define SWRM_CMD_FIFO_STATUS 0x30C
+#define SWRM_CMD_FIFO_CFG_ADDR 0x314
+#define SWRM_CMD_FIFO_CFG_NUM_OF_CMD_RETRY_SHFT 0x0
+#define SWRM_CMD_FIFO_RD_FIFO_ADDR 0x318
+#define SWRM_ENUMERATOR_CFG_ADDR 0x500
+#define SWRM_MCP_FRAME_CTRL_BANK_ADDR(m) (0x101C + 0x40 * (m))
+#define SWRM_MCP_FRAME_CTRL_BANK_SSP_PERIOD_SHFT 16
+#define SWRM_MCP_FRAME_CTRL_BANK_ROW_CTRL_SHFT 3
+#define SWRM_MCP_FRAME_CTRL_BANK_COL_CTRL_BMSK GENMASK(2, 0)
+#define SWRM_MCP_FRAME_CTRL_BANK_COL_CTRL_SHFT 0
+#define SWRM_MCP_CFG_ADDR 0x1048
+#define SWRM_MCP_CFG_MAX_NUM_OF_CMD_NO_PINGS_BMSK GENMASK(21, 17)
+#define SWRM_MCP_CFG_MAX_NUM_OF_CMD_NO_PINGS_SHFT 0x11
+#define SWRM_MCP_STATUS 0x104C
+#define SWRM_MCP_STATUS_BANK_NUM_MASK BIT(0)
+#define SWRM_MCP_SLV_STATUS 0x1090
+#define SWRM_MCP_SLV_STATUS_MASK GENMASK(1, 0)
+#define SWRM_DP_PORT_CTRL_BANK(n, m) (0x1124 + 0x100 * (n - 1) + 0x40 * m)
+#define SWRM_DP_PORT_CTRL2_BANK(n, m) (0x1126 + 0x100 * (n - 1) + 0x40 * m)
+#define SWRM_DP_PORT_CTRL_EN_CHAN_SHFT 0x18
+#define SWRM_DP_PORT_CTRL_OFFSET2_SHFT 0x10
+#define SWRM_DP_PORT_CTRL_OFFSET1_SHFT 0x08
+#define SWRM_AHB_BRIDGE_WR_DATA_0 0xc885
+#define SWRM_AHB_BRIDGE_WR_ADDR_0 0xc889
+#define SWRM_AHB_BRIDGE_RD_ADDR_0 0xc88d
+#define SWRM_AHB_BRIDGE_RD_DATA_0 0xc891
+
+#define SWRM_REG_VAL_PACK(data, dev, id, reg) \
+ ((reg) | ((id) << 16) | ((dev) << 20) | ((data) << 24))
+
+#define SWRM_MAX_ROW_VAL 0 /* Rows = 48 */
+#define SWRM_DEFAULT_ROWS 48
+#define SWRM_MIN_COL_VAL 0 /* Cols = 2 */
+#define SWRM_DEFAULT_COL 16
+#define SWRM_SPECIAL_CMD_ID 0xF
+#define MAX_FREQ_NUM 1
+#define TIMEOUT_MS 1000
+#define QCOM_SWRM_MAX_RD_LEN 0xf
+#define DEFAULT_CLK_FREQ 9600000
+#define SWRM_MAX_DAIS 0xF
+
+struct qcom_swrm_port_config {
+ u8 si;
+ u8 off1;
+ u8 off2;
+};
+
+struct qcom_swrm_ctrl {
+ struct sdw_bus bus;
+ struct device *dev;
+ struct regmap *regmap;
+ struct completion sp_cmd_comp;
+ struct work_struct slave_work;
+ /* read/write lock */
+ struct mutex lock;
+ /* Port alloc/free lock */
+ struct mutex port_lock;
+ struct clk *hclk;
+ int fifo_status;
+ void __iomem *base;
+ u8 wr_cmd_id;
+ u8 rd_cmd_id;
+ int irq;
+ unsigned int version;
+ int num_din_ports;
+ int num_dout_ports;
+ unsigned long dout_port_mask;
+ unsigned long din_port_mask;
+ struct qcom_swrm_port_config pconfig[SDW_MAX_PORTS];
+ struct sdw_stream_runtime *sruntime[SWRM_MAX_DAIS];
+ enum sdw_slave_status status[SDW_MAX_DEVICES];
+ u32 (*reg_read)(struct qcom_swrm_ctrl *ctrl, int reg);
+ int (*reg_write)(struct qcom_swrm_ctrl *ctrl, int reg, int val);
+};
+
+#define to_qcom_sdw(b) container_of(b, struct qcom_swrm_ctrl, bus)
+
+struct usecase {
+ u8 num_port;
+ u8 num_ch;
+ u32 chrate;
+};
+
+static u32 qcom_swrm_slim_reg_read(struct qcom_swrm_ctrl *ctrl, int reg)
+{
+ struct regmap *wcd_regmap = ctrl->regmap;
+ u32 val = 0, ret;
+
+ /* pg register + offset */
+ regmap_bulk_write(wcd_regmap, SWRM_AHB_BRIDGE_RD_ADDR_0,
+ (u8 *)&reg, 4);
+
+ ret = regmap_bulk_read(wcd_regmap, SWRM_AHB_BRIDGE_RD_DATA_0,
+ (u8 *)&val, 4);
+ if (ret < 0)
+ dev_err(ctrl->dev, "Read Failure (%d)\n", ret);
+
+ return val;
+}
+
+static u32 qcom_swrm_mmio_reg_read(struct qcom_swrm_ctrl *ctrl, int reg)
+{
+ return readl_relaxed(ctrl->base + reg);
+}
+
+static int qcom_swrm_mmio_reg_write(struct qcom_swrm_ctrl *ctrl,
+ int reg, int val)
+{
+ writel_relaxed(val, ctrl->base + reg);
+
+ return 0;
+}
+
+static int qcom_swrm_slim_reg_write(struct qcom_swrm_ctrl *ctrl,
+ int reg, int val)
+{
+ struct regmap *wcd_regmap = ctrl->regmap;
+
+ /* pg register + offset */
+ regmap_bulk_write(wcd_regmap, SWRM_AHB_BRIDGE_WR_DATA_0,
+ (u8 *)&val, 4);
+ /* write address register */
+ regmap_bulk_write(wcd_regmap, SWRM_AHB_BRIDGE_WR_ADDR_0,
+ (u8 *)&reg, 4);
+
+ return 0;
+}
+
+static int qcom_swrm_cmd_fifo_wr_cmd(struct qcom_swrm_ctrl *ctrl, u8 cmd_data,
+ u8 dev_addr, u16 reg_addr)
+{
+ int ret = 0;
+ u8 cmd_id;
+ u32 val;
+
+ mutex_lock(&ctrl->lock);
+ if (dev_addr == SDW_BROADCAST_DEV_NUM) {
+ cmd_id = SWRM_SPECIAL_CMD_ID;
+ } else {
+ if (++ctrl->wr_cmd_id == SWRM_SPECIAL_CMD_ID)
+ ctrl->wr_cmd_id = 0;
+
+ cmd_id = ctrl->wr_cmd_id;
+ }
+
+ val = SWRM_REG_VAL_PACK(cmd_data, dev_addr, cmd_id, reg_addr);
+ ret = ctrl->reg_write(ctrl, SWRM_CMD_FIFO_WR_CMD, val);
+ if (ret < 0) {
+ dev_err(ctrl->dev, "%s: reg 0x%x write failed, err:%d\n",
+ __func__, val, ret);
+ goto err;
+ }
+
+ if (dev_addr == SDW_BROADCAST_DEV_NUM) {
+ ctrl->fifo_status = 0;
+ ret = wait_for_completion_timeout(&ctrl->sp_cmd_comp,
+ msecs_to_jiffies(TIMEOUT_MS));
+
+ if (!ret || ctrl->fifo_status) {
+ dev_err(ctrl->dev, "reg 0x%x write failed\n", val);
+ ret = -ENODATA;
+ goto err;
+ }
+ }
+err:
+ mutex_unlock(&ctrl->lock);
+ return ret;
+}
+
+static int qcom_swrm_cmd_fifo_rd_cmd(struct qcom_swrm_ctrl *ctrl,
+ u8 dev_addr, u16 reg_addr,
+ u32 len, u8 *rval)
+{
+ int i, ret = 0;
+ u8 cmd_id = 0;
+ u32 val;
+
+ mutex_lock(&ctrl->lock);
+ if (dev_addr == SDW_ENUM_DEV_NUM) {
+ cmd_id = SWRM_SPECIAL_CMD_ID;
+ } else {
+ if (++ctrl->rd_cmd_id == SWRM_SPECIAL_CMD_ID)
+ ctrl->rd_cmd_id = 0;
+
+ cmd_id = ctrl->rd_cmd_id;
+ }
+
+ val = SWRM_REG_VAL_PACK(len, dev_addr, cmd_id, reg_addr);
+ ret = ctrl->reg_write(ctrl, SWRM_CMD_FIFO_RD_CMD, val);
+ if (ret < 0) {
+ dev_err(ctrl->dev, "reg 0x%x write failed err:%d\n", val, ret);
+ goto err;
+ }
+
+ if (dev_addr == SDW_ENUM_DEV_NUM) {
+ ctrl->fifo_status = 0;
+ ret = wait_for_completion_timeout(&ctrl->sp_cmd_comp,
+ msecs_to_jiffies(TIMEOUT_MS));
+
+ if (!ret || ctrl->fifo_status) {
+ dev_err(ctrl->dev, "reg 0x%x read failed\n", val);
+ ret = -ENODATA;
+ goto err;
+ }
+ }
+
+ for (i = 0; i < len; i++) {
+ rval[i] = ctrl->reg_read(ctrl, SWRM_CMD_FIFO_RD_FIFO_ADDR);
+ rval[i] &= 0xFF;
+ }
+
+err:
+ mutex_unlock(&ctrl->lock);
+ return ret;
+}
+
+static void qcom_swrm_get_device_status(struct qcom_swrm_ctrl *ctrl)
+{
+ u32 val = ctrl->reg_read(ctrl, SWRM_MCP_SLV_STATUS);
+ int i;
+
+ for (i = 1; i < SDW_MAX_DEVICES; i++) {
+ u32 s;
+
+ s = (val >> (i * 2));
+ s &= SWRM_MCP_SLV_STATUS_MASK;
+ ctrl->status[i] = s;
+ }
+}
+
+static irqreturn_t qcom_swrm_irq_handler(int irq, void *dev_id)
+{
+ struct qcom_swrm_ctrl *ctrl = dev_id;
+ u32 sts, value;
+
+ sts = ctrl->reg_read(ctrl, SWRM_INTERRUPT_STATUS);
+
+ if (sts & SWRM_INTERRUPT_STATUS_SPECIAL_CMD_ID_FINISHED)
+ complete(&ctrl->sp_cmd_comp);
+
+ if (sts & SWRM_INTERRUPT_STATUS_CMD_ERROR) {
+ value = ctrl->reg_read(ctrl, SWRM_CMD_FIFO_STATUS);
+ dev_err_ratelimited(ctrl->dev,
+ "CMD error, fifo status 0x%x\n",
+ value);
+ ctrl->reg_write(ctrl, SWRM_CMD_FIFO_CMD, 0x1);
+ if ((value & 0xF) == 0xF) {
+ ctrl->fifo_status = -ENODATA;
+ complete(&ctrl->sp_cmd_comp);
+ }
+ }
+
+ if ((sts & SWRM_INTERRUPT_STATUS_NEW_SLAVE_ATTACHED) ||
+ sts & SWRM_INTERRUPT_STATUS_CHANGE_ENUM_SLAVE_STATUS) {
+ if (sts & SWRM_INTERRUPT_STATUS_NEW_SLAVE_ATTACHED)
+ ctrl->status[0] = SDW_SLAVE_ATTACHED;
+
+ schedule_work(&ctrl->slave_work);
+ }
+
+ if (sts & SWRM_INTERRUPT_STATUS_SLAVE_PEND_IRQ)
+ dev_dbg(ctrl->dev, "Slave pend irq\n");
+
+ if (sts & SWRM_INTERRUPT_STATUS_NEW_SLAVE_ATTACHED)
+ dev_dbg(ctrl->dev, "New slave attached\n");
+
+ if (sts & SWRM_INTERRUPT_STATUS_MASTER_CLASH_DET)
+ dev_err_ratelimited(ctrl->dev, "Bus clash detected\n");
+
+ if (sts & SWRM_INTERRUPT_STATUS_RD_FIFO_OVERFLOW)
+ dev_err(ctrl->dev, "Read FIFO overflow\n");
+
+ if (sts & SWRM_INTERRUPT_STATUS_RD_FIFO_UNDERFLOW)
+ dev_err(ctrl->dev, "Read FIFO underflow\n");
+
+ if (sts & SWRM_INTERRUPT_STATUS_WR_CMD_FIFO_OVERFLOW)
+ dev_err(ctrl->dev, "Write FIFO overflow\n");
+
+ if (sts & SWRM_INTERRUPT_STATUS_DOUT_PORT_COLLISION)
+ dev_err(ctrl->dev, "Port collision detected\n");
+
+ if (sts & SWRM_INTERRUPT_STATUS_READ_EN_RD_VALID_MISMATCH)
+ dev_err(ctrl->dev, "Read enable valid mismatch\n");
+
+ if (sts & SWRM_INTERRUPT_STATUS_SPECIAL_CMD_ID_FINISHED)
+ dev_err(ctrl->dev, "Cmd id finished\n");
+
+ if (sts & SWRM_INTERRUPT_STATUS_BUS_RESET_FINISHED)
+ dev_err(ctrl->dev, "Bus reset finished\n");
+
+ ctrl->reg_write(ctrl, SWRM_INTERRUPT_CLEAR, sts);
+
+ return IRQ_HANDLED;
+}
+
+static int qcom_swrm_init(struct qcom_swrm_ctrl *ctrl)
+{
+ u32 val;
+ u8 row_ctrl = SWRM_MAX_ROW_VAL;
+ u8 col_ctrl = SWRM_MIN_COL_VAL;
+ u8 ssp_period = 1;
+ u8 retry_cmd_num = 3;
+
+ /* Clear Rows and Cols */
+ val = ((row_ctrl << SWRM_MCP_FRAME_CTRL_BANK_ROW_CTRL_SHFT) |
+ (col_ctrl << SWRM_MCP_FRAME_CTRL_BANK_COL_CTRL_SHFT) |
+ (ssp_period << SWRM_MCP_FRAME_CTRL_BANK_SSP_PERIOD_SHFT));
+
+ ctrl->reg_write(ctrl, SWRM_MCP_FRAME_CTRL_BANK_ADDR(0), val);
+
+ /* Disable Auto enumeration */
+ ctrl->reg_write(ctrl, SWRM_ENUMERATOR_CFG_ADDR, 0);
+
+ /* Mask soundwire interrupts */
+ ctrl->reg_write(ctrl, SWRM_INTERRUPT_MASK_ADDR,
+ SWRM_INTERRUPT_STATUS_RMSK);
+
+ /* Configure No pings */
+ val = ctrl->reg_read(ctrl, SWRM_MCP_CFG_ADDR);
+
+ val &= ~SWRM_MCP_CFG_MAX_NUM_OF_CMD_NO_PINGS_BMSK;
+ val |= (0x1f << SWRM_MCP_CFG_MAX_NUM_OF_CMD_NO_PINGS_SHFT);
+ ctrl->reg_write(ctrl, SWRM_MCP_CFG_ADDR, val);
+
+ /* Configure number of retries of a read/write cmd */
+ val = (retry_cmd_num << SWRM_CMD_FIFO_CFG_NUM_OF_CMD_RETRY_SHFT);
+ ctrl->reg_write(ctrl, SWRM_CMD_FIFO_CFG_ADDR, val);
+
+ /* Set IRQ to PULSE */
+ ctrl->reg_write(ctrl, SWRM_COMP_CFG_ADDR,
+ SWRM_COMP_CFG_IRQ_LEVEL_OR_PULSE_MSK |
+ SWRM_COMP_CFG_ENABLE_MSK);
+ return 0;
+}
+
+static enum sdw_command_response qcom_swrm_xfer_msg(struct sdw_bus *bus,
+ struct sdw_msg *msg)
+{
+ struct qcom_swrm_ctrl *ctrl = to_qcom_sdw(bus);
+ int ret, i, len;
+
+ if (msg->flags == SDW_MSG_FLAG_READ) {
+ for (i = 0; i < msg->len;) {
+ if ((msg->len - i) < QCOM_SWRM_MAX_RD_LEN)
+ len = msg->len - i;
+ else
+ len = QCOM_SWRM_MAX_RD_LEN;
+
+ ret = qcom_swrm_cmd_fifo_rd_cmd(ctrl, msg->dev_num,
+ msg->addr + i, len,
+ &msg->buf[i]);
+ if (ret < 0) {
+ if (ret == -ENODATA)
+ return SDW_CMD_IGNORED;
+
+ return ret;
+ }
+
+ i = i + len;
+ }
+ } else if (msg->flags == SDW_MSG_FLAG_WRITE) {
+ for (i = 0; i < msg->len; i++) {
+ ret = qcom_swrm_cmd_fifo_wr_cmd(ctrl, msg->buf[i],
+ msg->dev_num,
+ msg->addr + i);
+ if (ret < 0) {
+ if (ret == -ENODATA)
+ return SDW_CMD_IGNORED;
+
+ return ret;
+ }
+ }
+ }
+
+ return SDW_CMD_OK;
+}
+
+static int qcom_swrm_pre_bank_switch(struct sdw_bus *bus)
+{
+ u32 reg = SWRM_MCP_FRAME_CTRL_BANK_ADDR(bus->params.next_bank);
+ struct qcom_swrm_ctrl *ctrl = to_qcom_sdw(bus);
+ u32 val;
+
+ val = ctrl->reg_read(ctrl, reg);
+ val |= ((0 << SWRM_MCP_FRAME_CTRL_BANK_ROW_CTRL_SHFT) |
+ (7l << SWRM_MCP_FRAME_CTRL_BANK_COL_CTRL_SHFT));
+ ctrl->reg_write(ctrl, reg, val);
+
+ return 0;
+}
+
+static int qcom_swrm_port_params(struct sdw_bus *bus,
+ struct sdw_port_params *p_params,
+ unsigned int bank)
+{
+ /* TBD */
+ return 0;
+}
+
+static int qcom_swrm_transport_params(struct sdw_bus *bus,
+ struct sdw_transport_params *params,
+ enum sdw_reg_bank bank)
+{
+ struct qcom_swrm_ctrl *ctrl = to_qcom_sdw(bus);
+ u32 value;
+
+ value = params->offset1 << SWRM_DP_PORT_CTRL_OFFSET1_SHFT;
+ value |= params->offset2 << SWRM_DP_PORT_CTRL_OFFSET2_SHFT;
+ value |= params->sample_interval - 1;
+
+ ctrl->reg_write(ctrl, SWRM_DP_PORT_CTRL_BANK((params->port_num), bank),
+ value);
+
+ return 0;
+}
+
+static int qcom_swrm_port_enable(struct sdw_bus *bus,
+ struct sdw_enable_ch *enable_ch,
+ unsigned int bank)
+{
+ u32 reg = SWRM_DP_PORT_CTRL_BANK(enable_ch->port_num, bank);
+ struct qcom_swrm_ctrl *ctrl = to_qcom_sdw(bus);
+ u32 val;
+
+ val = ctrl->reg_read(ctrl, reg);
+ if (enable_ch->enable)
+ val |= (enable_ch->ch_mask << SWRM_DP_PORT_CTRL_EN_CHAN_SHFT);
+ else
+ val &= ~(enable_ch->ch_mask << SWRM_DP_PORT_CTRL_EN_CHAN_SHFT);
+
+ ctrl->reg_write(ctrl, reg, val);
+
+ return 0;
+}
+
+static struct sdw_master_port_ops qcom_swrm_port_ops = {
+ .dpn_set_port_params = qcom_swrm_port_params,
+ .dpn_set_port_transport_params = qcom_swrm_transport_params,
+ .dpn_port_enable_ch = qcom_swrm_port_enable,
+};
+
+static struct sdw_master_ops qcom_swrm_ops = {
+ .xfer_msg = qcom_swrm_xfer_msg,
+ .pre_bank_switch = qcom_swrm_pre_bank_switch,
+};
+
+static int qcom_swrm_compute_params(struct sdw_bus *bus)
+{
+ struct qcom_swrm_ctrl *ctrl = to_qcom_sdw(bus);
+ struct sdw_master_runtime *m_rt;
+ struct sdw_slave_runtime *s_rt;
+ struct sdw_port_runtime *p_rt;
+ int i = 0;
+
+ list_for_each_entry(m_rt, &bus->m_rt_list, bus_node) {
+ list_for_each_entry(p_rt, &m_rt->port_list, port_node) {
+ p_rt->transport_params.port_num = p_rt->num;
+ p_rt->transport_params.sample_interval =
+ ctrl->pconfig[p_rt->num - 1].si + 1;
+ p_rt->transport_params.offset1 =
+ ctrl->pconfig[p_rt->num - 1].off1;
+ p_rt->transport_params.offset2 =
+ ctrl->pconfig[p_rt->num - 1].off2;
+ }
+
+ list_for_each_entry(s_rt, &m_rt->slave_rt_list, m_rt_node) {
+ list_for_each_entry(p_rt, &s_rt->port_list, port_node) {
+ p_rt->transport_params.port_num = p_rt->num;
+ p_rt->transport_params.sample_interval =
+ ctrl->pconfig[i].si + 1;
+ p_rt->transport_params.offset1 =
+ ctrl->pconfig[i].off1;
+ p_rt->transport_params.offset2 =
+ ctrl->pconfig[i].off2;
+ i++;
+ }
+ }
+ }
+
+ return 0;
+}
+
+static u32 qcom_swrm_freq_tbl[MAX_FREQ_NUM] = {
+ DEFAULT_CLK_FREQ,
+};
+
+static void qcom_swrm_slave_wq(struct work_struct *work)
+{
+ struct qcom_swrm_ctrl *ctrl =
+ container_of(work, struct qcom_swrm_ctrl, slave_work);
+
+ qcom_swrm_get_device_status(ctrl);
+ sdw_handle_slave_status(&ctrl->bus, ctrl->status);
+}
+
+static int qcom_swrm_prepare(struct snd_pcm_substream *substream,
+ struct snd_soc_dai *dai)
+{
+ struct qcom_swrm_ctrl *ctrl = dev_get_drvdata(dai->dev);
+
+ if (!ctrl->sruntime[dai->id])
+ return -EINVAL;
+
+ return sdw_enable_stream(ctrl->sruntime[dai->id]);
+}
+
+static void qcom_swrm_stream_free_ports(struct qcom_swrm_ctrl *ctrl,
+ struct sdw_stream_runtime *stream)
+{
+ struct sdw_master_runtime *m_rt;
+ struct sdw_port_runtime *p_rt;
+ unsigned long *port_mask;
+
+ mutex_lock(&ctrl->port_lock);
+
+ list_for_each_entry(m_rt, &stream->master_list, stream_node) {
+ if (m_rt->direction == SDW_DATA_DIR_RX)
+ port_mask = &ctrl->dout_port_mask;
+ else
+ port_mask = &ctrl->din_port_mask;
+
+ list_for_each_entry(p_rt, &m_rt->port_list, port_node) {
+ clear_bit(p_rt->num - 1, port_mask);
+ }
+ }
+
+ mutex_unlock(&ctrl->port_lock);
+}
+
+static int qcom_swrm_stream_alloc_ports(struct qcom_swrm_ctrl *ctrl,
+ struct sdw_stream_runtime *stream,
+ struct snd_pcm_hw_params *params,
+ int direction)
+{
+ struct sdw_port_config pconfig[SDW_MAX_PORTS];
+ struct sdw_stream_config sconfig;
+ struct sdw_master_runtime *m_rt;
+ struct sdw_slave_runtime *s_rt;
+ struct sdw_port_runtime *p_rt;
+ unsigned long *port_mask;
+ int i, maxport, pn, nports = 0, ret = 0;
+
+ mutex_lock(&ctrl->port_lock);
+ list_for_each_entry(m_rt, &stream->master_list, stream_node) {
+ if (m_rt->direction == SDW_DATA_DIR_RX) {
+ maxport = ctrl->num_dout_ports;
+ port_mask = &ctrl->dout_port_mask;
+ } else {
+ maxport = ctrl->num_din_ports;
+ port_mask = &ctrl->din_port_mask;
+ }
+
+ list_for_each_entry(s_rt, &m_rt->slave_rt_list, m_rt_node) {
+ list_for_each_entry(p_rt, &s_rt->port_list, port_node) {
+ /* Port numbers start from 1 - 14*/
+ pn = find_first_zero_bit(port_mask, maxport);
+ if (pn > (maxport - 1)) {
+ dev_err(ctrl->dev, "All ports busy\n");
+ ret = -EBUSY;
+ goto err;
+ }
+ set_bit(pn, port_mask);
+ pconfig[nports].num = pn + 1;
+ pconfig[nports].ch_mask = p_rt->ch_mask;
+ nports++;
+ }
+ }
+ }
+
+ if (direction == SNDRV_PCM_STREAM_CAPTURE)
+ sconfig.direction = SDW_DATA_DIR_TX;
+ else
+ sconfig.direction = SDW_DATA_DIR_RX;
+
+ sconfig.ch_count = 1;
+ sconfig.frame_rate = params_rate(params);
+ sconfig.type = stream->type;
+ sconfig.bps = 1;
+ sdw_stream_add_master(&ctrl->bus, &sconfig, pconfig,
+ nports, stream);
+err:
+ if (ret) {
+ for (i = 0; i < nports; i++)
+ clear_bit(pconfig[i].num - 1, port_mask);
+ }
+
+ mutex_unlock(&ctrl->port_lock);
+
+ return ret;
+}
+
+static int qcom_swrm_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *params,
+ struct snd_soc_dai *dai)
+{
+ struct qcom_swrm_ctrl *ctrl = dev_get_drvdata(dai->dev);
+ int ret;
+
+ ret = qcom_swrm_stream_alloc_ports(ctrl, ctrl->sruntime[dai->id],
+ params, substream->stream);
+ if (ret)
+ return ret;
+
+ return sdw_prepare_stream(ctrl->sruntime[dai->id]);
+}
+
+static int qcom_swrm_hw_free(struct snd_pcm_substream *substream,
+ struct snd_soc_dai *dai)
+{
+ struct qcom_swrm_ctrl *ctrl = dev_get_drvdata(dai->dev);
+
+ qcom_swrm_stream_free_ports(ctrl, ctrl->sruntime[dai->id]);
+ sdw_stream_remove_master(&ctrl->bus, ctrl->sruntime[dai->id]);
+ sdw_deprepare_stream(ctrl->sruntime[dai->id]);
+ sdw_disable_stream(ctrl->sruntime[dai->id]);
+
+ return 0;
+}
+
+static void *qcom_pdm_get_sdw_stream(struct snd_soc_dai *dai,
+ int direction)
+{
+ struct qcom_swrm_ctrl *ctrl = dev_get_drvdata(dai->dev);
+
+ return ctrl->sruntime[dai->id];
+}
+
+static int qcom_pdm_set_sdw_stream(struct snd_soc_dai *dai,
+ void *stream, int direction)
+{
+ return 0;
+}
+
+static int qcom_swrm_startup(struct snd_pcm_substream *stream,
+ struct snd_soc_dai *dai)
+{
+ struct qcom_swrm_ctrl *ctrl = dev_get_drvdata(dai->dev);
+ struct sdw_stream_runtime *sruntime;
+
+ sruntime = sdw_alloc_stream(dai->name);
+ if (!sruntime)
+ return -ENOMEM;
+
+ ctrl->sruntime[dai->id] = sruntime;
+
+ return 0;
+}
+
+static void qcom_swrm_shutdown(struct snd_pcm_substream *stream,
+ struct snd_soc_dai *dai)
+{
+ struct qcom_swrm_ctrl *ctrl = dev_get_drvdata(dai->dev);
+
+ sdw_release_stream(ctrl->sruntime[dai->id]);
+ ctrl->sruntime[dai->id] = NULL;
+}
+
+static const struct snd_soc_dai_ops qcom_swrm_pdm_dai_ops = {
+ .hw_params = qcom_swrm_hw_params,
+ .prepare = qcom_swrm_prepare,
+ .hw_free = qcom_swrm_hw_free,
+ .startup = qcom_swrm_startup,
+ .shutdown = qcom_swrm_shutdown,
+ .set_sdw_stream = qcom_pdm_set_sdw_stream,
+ .get_sdw_stream = qcom_pdm_get_sdw_stream,
+};
+
+static const struct snd_soc_component_driver qcom_swrm_dai_component = {
+ .name = "soundwire",
+};
+
+static int qcom_swrm_register_dais(struct qcom_swrm_ctrl *ctrl)
+{
+ int num_dais = ctrl->num_dout_ports + ctrl->num_din_ports;
+ struct snd_soc_dai_driver *dais;
+ int i;
+
+ /* PDM dais are only tested for now */
+ dais = devm_kcalloc(ctrl->dev, num_dais, sizeof(*dais), GFP_KERNEL);
+ if (!dais)
+ return -ENOMEM;
+
+ for (i = 0; i < num_dais; i++) {
+ dais[i].name = kasprintf(GFP_KERNEL, "SDW Pin%d", i);
+ if (i < ctrl->num_dout_ports) {
+ dais[i].playback.stream_name = kasprintf(GFP_KERNEL,
+ "SDW Tx%d", i);
+ if (!dais[i].playback.stream_name) {
+ kfree(dais[i].name);
+ return -ENOMEM;
+ }
+ dais[i].playback.channels_min = 1;
+ dais[i].playback.channels_max = 1;
+ dais[i].playback.rates = SNDRV_PCM_RATE_48000;
+ dais[i].playback.formats = SNDRV_PCM_FMTBIT_S16_LE;
+ } else {
+ dais[i].capture.stream_name = kasprintf(GFP_KERNEL,
+ "SDW Rx%d", i);
+ if (!dais[i].capture.stream_name) {
+ kfree(dais[i].name);
+ kfree(dais[i].playback.stream_name);
+ return -ENOMEM;
+ }
+
+ dais[i].capture.channels_min = 1;
+ dais[i].capture.channels_max = 1;
+ dais[i].capture.rates = SNDRV_PCM_RATE_48000;
+ dais[i].capture.formats = SNDRV_PCM_FMTBIT_S16_LE;
+ }
+ dais[i].ops = &qcom_swrm_pdm_dai_ops;
+ dais[i].id = i;
+ }
+
+ return devm_snd_soc_register_component(ctrl->dev,
+ &qcom_swrm_dai_component,
+ dais, num_dais);
+}
+
+static int qcom_swrm_get_port_config(struct qcom_swrm_ctrl *ctrl)
+{
+ struct device_node *np = ctrl->dev->of_node;
+ u8 off1[SDW_MAX_PORTS];
+ u8 off2[SDW_MAX_PORTS];
+ u8 si[SDW_MAX_PORTS];
+ int i, ret, nports, val;
+
+ val = ctrl->reg_read(ctrl, SWRM_COMP_PARAMS);
+ ctrl->num_dout_ports = val & SWRM_COMP_PARAMS_DOUT_PORTS_MASK;
+ ctrl->num_din_ports = (val & SWRM_COMP_PARAMS_DIN_PORTS_MASK) >> 5;
+
+ ret = of_property_read_u32(np, "qcom,din-ports", &val);
+ if (ret)
+ return ret;
+
+ if (val > ctrl->num_din_ports)
+ return -EINVAL;
+
+ ctrl->num_din_ports = val;
+
+ ret = of_property_read_u32(np, "qcom,dout-ports", &val);
+ if (ret)
+ return ret;
+
+ if (val > ctrl->num_dout_ports)
+ return -EINVAL;
+
+ ctrl->num_dout_ports = val;
+
+ nports = ctrl->num_dout_ports + ctrl->num_din_ports;
+
+ ret = of_property_read_u8_array(np, "qcom,ports-offset1",
+ off1, nports);
+ if (ret)
+ return ret;
+
+ ret = of_property_read_u8_array(np, "qcom,ports-offset2",
+ off2, nports);
+ if (ret)
+ return ret;
+
+ ret = of_property_read_u8_array(np, "qcom,ports-sinterval-low",
+ si, nports);
+ if (ret)
+ return ret;
+
+ for (i = 0; i < nports; i++) {
+ ctrl->pconfig[i].si = si[i];
+ ctrl->pconfig[i].off1 = off1[i];
+ ctrl->pconfig[i].off2 = off2[i];
+ }
+
+ return 0;
+}
+
+static int qcom_swrm_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct sdw_master_prop *prop;
+ struct sdw_bus_params *params;
+ struct qcom_swrm_ctrl *ctrl;
+ struct resource *res;
+ int ret;
+
+ ctrl = devm_kzalloc(dev, sizeof(*ctrl), GFP_KERNEL);
+ if (!ctrl)
+ return -ENOMEM;
+
+ if (dev->parent->bus == &slimbus_bus) {
+ ctrl->reg_read = qcom_swrm_slim_reg_read;
+ ctrl->reg_write = qcom_swrm_slim_reg_write;
+ ctrl->regmap = dev_get_regmap(dev->parent, NULL);
+ if (!ctrl->regmap)
+ return -EINVAL;
+ } else {
+ ctrl->reg_read = qcom_swrm_mmio_reg_read;
+ ctrl->reg_write = qcom_swrm_mmio_reg_write;
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ ctrl->base = devm_ioremap_resource(dev, res);
+ if (IS_ERR(ctrl->base))
+ return PTR_ERR(ctrl->base);
+ }
+
+ ctrl->irq = platform_get_irq(pdev, 0);
+ if (ctrl->irq < 0)
+ return ctrl->irq;
+
+ ctrl->hclk = devm_clk_get(dev, "iface");
+ if (IS_ERR(ctrl->hclk))
+ return PTR_ERR(ctrl->hclk);
+
+ clk_prepare_enable(ctrl->hclk);
+
+ ctrl->dev = dev;
+ dev_set_drvdata(&pdev->dev, ctrl);
+ init_completion(&ctrl->sp_cmd_comp);
+ mutex_init(&ctrl->lock);
+ mutex_init(&ctrl->port_lock);
+ INIT_WORK(&ctrl->slave_work, qcom_swrm_slave_wq);
+
+ ctrl->bus.dev = dev;
+ ctrl->bus.ops = &qcom_swrm_ops;
+ ctrl->bus.port_ops = &qcom_swrm_port_ops;
+ ctrl->bus.compute_params = &qcom_swrm_compute_params;
+
+ ret = qcom_swrm_get_port_config(ctrl);
+ if (ret)
+ return ret;
+
+ params = &ctrl->bus.params;
+ params->max_dr_freq = DEFAULT_CLK_FREQ;
+ params->curr_dr_freq = DEFAULT_CLK_FREQ;
+ params->col = SWRM_DEFAULT_COL;
+ params->row = SWRM_DEFAULT_ROWS;
+ params->curr_bank = ctrl->reg_read(ctrl, SWRM_MCP_STATUS) &
+ SWRM_MCP_STATUS_BANK_NUM_MASK;
+ params->next_bank = !params->curr_bank;
+
+ prop = &ctrl->bus.prop;
+ prop->max_clk_freq = DEFAULT_CLK_FREQ;
+ prop->num_clk_gears = 0;
+ prop->num_clk_freq = MAX_FREQ_NUM;
+ prop->clk_freq = &qcom_swrm_freq_tbl[0];
+ prop->default_col = SWRM_DEFAULT_COL;
+ prop->default_row = SWRM_DEFAULT_ROWS;
+
+ ctrl->version = ctrl->reg_read(ctrl, SWRM_COMP_HW_VERSION);
+
+ ret = devm_request_threaded_irq(dev, ctrl->irq, NULL,
+ qcom_swrm_irq_handler,
+ IRQF_TRIGGER_RISING,
+ "soundwire", ctrl);
+ if (ret) {
+ dev_err(dev, "Failed to request soundwire irq\n");
+ goto err;
+ }
+
+ ret = sdw_add_bus_master(&ctrl->bus);
+ if (ret) {
+ dev_err(dev, "Failed to register Soundwire controller (%d)\n",
+ ret);
+ goto err;
+ }
+
+ qcom_swrm_init(ctrl);
+ ret = qcom_swrm_register_dais(ctrl);
+ if (ret)
+ goto err;
+
+ dev_info(dev, "Qualcomm Soundwire controller v%x.%x.%x Registered\n",
+ (ctrl->version >> 24) & 0xff, (ctrl->version >> 16) & 0xff,
+ ctrl->version & 0xffff);
+
+ return 0;
+err:
+ clk_disable_unprepare(ctrl->hclk);
+ return ret;
+}
+
+static int qcom_swrm_remove(struct platform_device *pdev)
+{
+ struct qcom_swrm_ctrl *ctrl = dev_get_drvdata(&pdev->dev);
+
+ sdw_delete_bus_master(&ctrl->bus);
+ clk_disable_unprepare(ctrl->hclk);
+
+ return 0;
+}
+
+static int qcom_swrm_runtime_suspend(struct device *device)
+{
+ /* TBD */
+ return 0;
+}
+
+static int qcom_swrm_runtime_resume(struct device *device)
+{
+ /* TBD */
+ return 0;
+}
+
+static const struct dev_pm_ops qcom_swrm_dev_pm_ops = {
+ SET_RUNTIME_PM_OPS(qcom_swrm_runtime_suspend,
+ qcom_swrm_runtime_resume,
+ NULL
+ )
+};
+
+static const struct of_device_id qcom_swrm_of_match[] = {
+ { .compatible = "qcom,soundwire-v1.3.0",},
+ { .compatible = "qcom,soundwire-v1.5.0",},
+ { .compatible = "qcom,soundwire-v1.6.0",},
+ {/* sentinel */},
+};
+
+MODULE_DEVICE_TABLE(of, qcom_swrm_of_match);
+
+static struct platform_driver qcom_swrm_driver = {
+ .probe = &qcom_swrm_probe,
+ .remove = &qcom_swrm_remove,
+ .driver = {
+ .name = "qcom-soundwire",
+ .of_match_table = qcom_swrm_of_match,
+ .pm = &qcom_swrm_dev_pm_ops,
+ }
+};
+module_platform_driver(qcom_swrm_driver);
+
+MODULE_DESCRIPTION("Qualcomm soundwire driver");
+MODULE_LICENSE("GPL v2");
--
2.21.0