[PATCH 2/5] soundwire: qcom: add support for mmio soundwire devices

[Jonathan Marek]

Adds support for qcom soundwire devices with memory mapped IO registers.

Signed-off-by: Jonathan Marek <jonat...@marek.ca>
---
 drivers/soundwire/qcom.c | 25 +++++++++++++++++++++++--
 1 file changed, 23 insertions(+), 2 deletions(-)

diff --git a/drivers/soundwire/qcom.c b/drivers/soundwire/qcom.c
index f38d1fd3679f..628747df1c75 100644
--- a/drivers/soundwire/qcom.c
+++ b/drivers/soundwire/qcom.c
@@ -90,6 +90,7 @@ struct qcom_swrm_ctrl {
        struct sdw_bus bus;
        struct device *dev;
        struct regmap *regmap;
+       void __iomem *mmio;
        struct completion *comp;
        struct work_struct slave_work;
        /* read/write lock */
@@ -154,6 +155,20 @@ static int qcom_swrm_ahb_reg_write(struct qcom_swrm_ctrl 
*ctrl,
        return SDW_CMD_OK;
 }
 
+static int qcom_swrm_cpu_reg_read(struct qcom_swrm_ctrl *ctrl, int reg,
+                                 u32 *val)
+{
+       *val = readl(ctrl->mmio + reg);
+       return SDW_CMD_OK;
+}
+
+static int qcom_swrm_cpu_reg_write(struct qcom_swrm_ctrl *ctrl, int reg,
+                                  int val)
+{
+       writel(val, ctrl->mmio + reg);
+       return SDW_CMD_OK;
+}
+
 static int qcom_swrm_cmd_fifo_wr_cmd(struct qcom_swrm_ctrl *ctrl, u8 cmd_data,
                                     u8 dev_addr, u16 reg_addr)
 {
@@ -746,6 +761,7 @@ static int qcom_swrm_probe(struct platform_device *pdev)
        struct sdw_master_prop *prop;
        struct sdw_bus_params *params;
        struct qcom_swrm_ctrl *ctrl;
+       struct resource *res;
        int ret;
        u32 val;
 
@@ -760,8 +776,13 @@ static int qcom_swrm_probe(struct platform_device *pdev)
                if (!ctrl->regmap)
                        return -EINVAL;
        } else {
-               /* Only WCD based SoundWire controller is supported */
-               return -ENOTSUPP;
+               res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+
+               ctrl->reg_read = qcom_swrm_cpu_reg_read;
+               ctrl->reg_write = qcom_swrm_cpu_reg_write;
+               ctrl->mmio = devm_ioremap_resource(dev, res);
+               if (IS_ERR(ctrl->mmio))
+                       return PTR_ERR(ctrl->mmio);
        }
 
        ctrl->irq = of_irq_get(dev->of_node, 0);
-- 
2.26.1