Bluetooth: Add documentation for Marvell Bluetooth driver

add btmrvl.txt to Documentation/

This patch incorporates a lot of comments given by
Nicolas Pitre <nico@marvell.com>. Many thanks to Nicolas Pitre.

Signed-off-by: Rahul Tank <rahult@marvell.com>
Signed-off-by: Bing Zhao <bzhao@marvell.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

2 files changed, 121 insertions, 0 deletions

diff --git a/Documentation/00-INDEX b/Documentation/00-INDEX
index d05737aaa84b..06b982affe76 100644
--- a/Documentation/00-INDEX
+++ b/Documentation/00-INDEX
@@ -82,6 +82,8 @@ block/
         - info on the Block I/O (BIO) layer.
 blockdev/
         - info on block devices & drivers
+btmrvl.txt
+        - info on Marvell Bluetooth driver usage.
 cachetlb.txt
         - describes the cache/TLB flushing interfaces Linux uses.
 cdrom/
diff --git a/Documentation/btmrvl.txt b/Documentation/btmrvl.txt
new file mode 100644
index 000000000000..34916a46c099
--- /dev/null
+++ b/Documentation/btmrvl.txt
@@ -0,0 +1,119 @@
+=======================================================================
+                README for btmrvl driver
+=======================================================================
+
+
+All commands are used via debugfs interface.
+
+=====================
+Set/get driver configurations:
+
+Path:   /debug/btmrvl/config/
+
+gpiogap=[n]
+hscfgcmd
+        These commands are used to configure the host sleep parameters.
+        bit 8:0  -- Gap
+        bit 16:8 -- GPIO
+
+        where GPIO is the pin number of GPIO used to wake up the host.
+        It could be any valid GPIO pin# (e.g. 0-7) or 0xff (SDIO interface
+        wakeup will be used instead).
+
+        where Gap is the gap in milli seconds between wakeup signal and
+        wakeup event, or 0xff for special host sleep setting.
+
+        Usage:
+                # Use SDIO interface to wake up the host and set GAP to 0x80:
+                echo 0xff80 > /debug/btmrvl/config/gpiogap
+                echo 1 > /debug/btmrvl/config/hscfgcmd
+
+                # Use GPIO pin #3 to wake up the host and set GAP to 0xff:
+                echo 0x03ff >  /debug/btmrvl/config/gpiogap
+                echo 1 > /debug/btmrvl/config/hscfgcmd
+
+psmode=[n]
+pscmd
+        These commands are used to enable/disable auto sleep mode
+
+        where the option is:
+                        1       -- Enable auto sleep mode
+                        0       -- Disable auto sleep mode
+
+        Usage:
+                # Enable auto sleep mode
+                echo 1 > /debug/btmrvl/config/psmode
+                echo 1 > /debug/btmrvl/config/pscmd
+
+                # Disable auto sleep mode
+                echo 0 > /debug/btmrvl/config/psmode
+                echo 1 > /debug/btmrvl/config/pscmd
+
+
+hsmode=[n]
+hscmd
+        These commands are used to enable host sleep or wake up firmware
+
+        where the option is:
+                        1       -- Enable host sleep
+                        0       -- Wake up firmware
+
+        Usage:
+                # Enable host sleep
+                echo 1 > /debug/btmrvl/config/hsmode
+                echo 1 > /debug/btmrvl/config/hscmd
+
+                # Wake up firmware
+                echo 0 > /debug/btmrvl/config/hsmode
+                echo 1 > /debug/btmrvl/config/hscmd
+
+
+======================
+Get driver status:
+
+Path:   /debug/btmrvl/status/
+
+Usage:
+        cat /debug/btmrvl/status/<args>
+
+where the args are:
+
+curpsmode
+        This command displays current auto sleep status.
+
+psstate
+        This command display the power save state.
+
+hsstate
+        This command display the host sleep state.
+
+txdnldrdy
+        This command displays the value of Tx download ready flag.
+
+
+=====================
+
+Use hcitool to issue raw hci command, refer to hcitool manual
+
+        Usage: Hcitool cmd <ogf> <ocf> [Parameters]
+
+        Interface Control Command
+        hcitool cmd 0x3f 0x5b 0xf5 0x01 0x00    --Enable All interface
+        hcitool cmd 0x3f 0x5b 0xf5 0x01 0x01    --Enable Wlan interface
+        hcitool cmd 0x3f 0x5b 0xf5 0x01 0x02    --Enable BT interface
+        hcitool cmd 0x3f 0x5b 0xf5 0x00 0x00    --Disable All interface
+        hcitool cmd 0x3f 0x5b 0xf5 0x00 0x01    --Disable Wlan interface
+        hcitool cmd 0x3f 0x5b 0xf5 0x00 0x02    --Disable BT interface
+
+=======================================================================
+
+
+SD8688 firmware:
+
+/lib/firmware/sd8688_helper.bin
+/lib/firmware/sd8688.bin
+
+
+The images can be downloaded from:
+
+git.infradead.org/users/dwmw2/linux-firmware.git/libertas/