[PATCH 15/18] ASoC: SOF: Intel: hda-mlink: program SoundWire LSDIID registers

[Peter Ujfalusi <peter.ujfalusi@linux.intel.com>]

From: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>

Each SoundWire peripheral can be programmed from the manager side
either with a regular command FIFO, or with the HDaudio CORB/RIRB
DMA-based mechanism. The mapping between SoundWire peripheral and SDI
address is handled with the LSDIID register.

This mapping only works of course if each peripheral has a unique
address across all links. This has already been enforced in previous
Intel contributions allowing for an IDA-based solution for the device
number allocation.

The checks on the dev_num are handled at the SoundWire level, but the
locking is handled at the hda-mlink level.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Rander Wang <rander.wang@intel.com>
Reviewed-by: Péter Ujfalusi <peter.ujfalusi@linux.intel.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
---
 include/sound/hda-mlink.h       |  5 +++++
 sound/soc/sof/intel/hda-mlink.c | 30 ++++++++++++++++++++++++++++++
 2 files changed, 35 insertions(+)

diff --git a/include/sound/hda-mlink.h b/include/sound/hda-mlink.h
index 64106d439fd8..fc63aec97119 100644
--- a/include/sound/hda-mlink.h
+++ b/include/sound/hda-mlink.h
@@ -41,6 +41,8 @@ int hdac_bus_eml_power_down_unlocked(struct hdac_bus *bus, bool alt, int elid, i
 int hdac_bus_eml_sdw_power_up_unlocked(struct hdac_bus *bus, int sublink);
 int hdac_bus_eml_sdw_power_down_unlocked(struct hdac_bus *bus, int sublink);
 
+int hdac_bus_eml_sdw_set_lsdiid(struct hdac_bus *bus, int sublink, int dev_num);
+
 void hda_bus_ml_put_all(struct hdac_bus *bus);
 void hda_bus_ml_reset_losidv(struct hdac_bus *bus);
 int hda_bus_ml_resume(struct hdac_bus *bus);
@@ -131,6 +133,9 @@ hdac_bus_eml_sdw_power_up_unlocked(struct hdac_bus *bus, int sublink) { return 0
 static inline int
 hdac_bus_eml_sdw_power_down_unlocked(struct hdac_bus *bus, int sublink) { return 0; }
 
+static inline int
+hdac_bus_eml_sdw_set_lsdiid(struct hdac_bus *bus, int sublink, int dev_num) { return 0; }
+
 static inline void hda_bus_ml_put_all(struct hdac_bus *bus) { }
 static inline void hda_bus_ml_reset_losidv(struct hdac_bus *bus) { }
 static inline int hda_bus_ml_resume(struct hdac_bus *bus) { return 0; }
diff --git a/sound/soc/sof/intel/hda-mlink.c b/sound/soc/sof/intel/hda-mlink.c
index 0912989ce729..87e6c5f2f3ea 100644
--- a/sound/soc/sof/intel/hda-mlink.c
+++ b/sound/soc/sof/intel/hda-mlink.c
@@ -323,6 +323,16 @@ static bool hdaml_link_check_cmdsync(u32 __iomem *lsync, u32 cmdsync_mask)
 	return !!(val & cmdsync_mask);
 }
 
+static void hdaml_link_set_lsdiid(u32 __iomem *lsdiid, int dev_num)
+{
+	u32 val;
+
+	val = readl(lsdiid);
+	val |= BIT(dev_num);
+
+	writel(val, lsdiid);
+}
+
 /* END HDAML section */
 
 static int hda_ml_alloc_h2link(struct hdac_bus *bus, int index)
@@ -698,6 +708,26 @@ int hdac_bus_eml_sdw_power_down_unlocked(struct hdac_bus *bus, int sublink)
 }
 EXPORT_SYMBOL_NS(hdac_bus_eml_sdw_power_down_unlocked, SND_SOC_SOF_HDA_MLINK);
 
+int hdac_bus_eml_sdw_set_lsdiid(struct hdac_bus *bus, int sublink, int dev_num)
+{
+	struct hdac_ext2_link *h2link;
+	struct hdac_ext_link *hlink;
+
+	h2link = find_ext2_link(bus, true, AZX_REG_ML_LEPTR_ID_SDW);
+	if (!h2link)
+		return -ENODEV;
+
+	hlink = &h2link->hext_link;
+
+	mutex_lock(&h2link->eml_lock);
+
+	hdaml_link_set_lsdiid(hlink->ml_addr + AZX_REG_ML_LSDIID_OFFSET(sublink), dev_num);
+
+	mutex_unlock(&h2link->eml_lock);
+
+	return 0;
+} EXPORT_SYMBOL_NS(hdac_bus_eml_sdw_set_lsdiid, SND_SOC_SOF_HDA_MLINK);
+
 void hda_bus_ml_put_all(struct hdac_bus *bus)
 {
 	struct hdac_ext_link *hlink;
-- 
2.40.0