Thanks for taking time to review,
I agre with most of the comments specially handling returns and making
code more readable.
Will fix them in next version.
On 08/06/2019 22:53, Cezary Rojewski wrote:
On 2019-06-07 10:56, Srinivas Kandagatla wrote:
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"
+
Pierre already pointed this out - SWR looks odd. During my time with
Soundwire I've met SDW and SNDW, but it's the first time I see SWR.
These names are derived from register names from hw datasheet.
So I have not much choice here other than using them as it. May be
adding QCOM_ prefix make it bit more non-confusing.
You seem to shortcut every reg here similarly to how it's done in SDW
spec. INTERRUPT is represented by INT there, and by doing so, this
define block would look more like a real family.
Will do that in next version.!
+#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)
Some of these you align, others leave with the equal amount of tabs
despite different widths.
I will take a closer look at such instance before sending next version.
+#define SWRM_DP_PORT_CTRL2_BANK(n, m) (0x1126 + 0x100 * (n - 1) +
0x40 * m)
Consider reusing _CTRL_ and simply adding offset for 2_.
Okay.
+#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
Given the scale of this block, it might be good to reiterate all defines
and see if indeed all are QCom specific. Maybe some could be replaced by
equivalents from common code.
I did take a look at common defines, however these values are pretty
much specific to this controller configuration.>> +
+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;
Given the fact you don't use version field directly and always shift it,
I'd consider making use of union here to listing version bits
explicitly. Overall size won't change.
Okay, I tried to keep most of the driver simple as I could as this is
the first version, I will explore adding union as you suggested.
+ 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;
+};
+
"usecase" looks ambiguous at best.
Its leftover
+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 *)®, 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 *)®, 4);
+
+ return 0;
+}
Ok, so you choose to declare write op as returning "int" yet either it
cannot do so (void writel_relaxed) or ret is completely ignored
(regmap_bulk_write does return an int value). Either switch to void or
check against returned value whenever possible.
Its right to check the return values, I will change it this accordingly
and fix all such occurances.
+
+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);
Both, this and err msg above are generic enough to be put into goto to
save some space.
I agree!
+ 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);
Same for _rt_.
+ 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);
Just to be sure. It is really "read" that is failing here?
The final result is that read has not been sucessfull with a complete
interrupt. So yes read is failing here.
+ 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");
If you do not handle these errors at all, consider declaring
ERROR-message table. I believe leaving erroneus status as is may lead to
fatal consequences. If there is no intention for handling even the most
critical cases, please add TODO/ comment here.
Yep, I agree will clean this up!
+
+ 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;
As in my previous comment, you should check against ret from reg_write
if void approach is not chosen.
I agree!
+}
+
+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;
Any reason for inlining this incrementation? If _rd_ fails, we leave the
loop anyway.
+ }
+ } 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;
s/return 0/return ctrl->reg_write(ctrl, reg, val)/
+}
+
+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;
Another "return issue" here.
+}
+
+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;
ctrl->pconfig[ <idx> ] colleagues bellow make use of local index
variable which clearly makes it more readable.
+ }
+
+ 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);
+ }
Unnecessary brackets.
+ }
+
+ 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;
Hmm. frame_rate and type gets assigned based on "input" data yet the
rest is hardcoded. Is this intended?
For now I only managed to test PDM on this controller, and I agree these
need to be more generic..
+ 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]);
Declaring local variable initialized with ctrl->sruntime[dai->id] should
prove more readable.
I agree!
+
+ return 0;
+}
+
+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;
Now this got me worried. What about memory allocated in iterations
before the failure? It must be freed in error handling path. goto should
be of help here.
I agree.
+ }
+ 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;
All of these formats are hardcoded. Consider declaring a "template"
format above and simply initialize each dai with it.
Okay!
+ } 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;
Same memory deallocation issue here.
I see that, I will take care of this in next version.
+ }
+
+ 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;
Comment regarding playback dai initialization applies here too.
+ }
+ 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];
Array of struct qcom_swrm_port_config instead of this trio?
Makes sense! Will do that in next version.
+ 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];
+ }
Using array I spoke of earlier leads to brackets being redundant here.
+
+ return 0;
+}
+
