ARM: davinci: psc: introduce reset API

Introduce an IP reset API for use on DaVinci SoC.

There is no existing "reset" framework support for SoC devices.
The remoteproc driver needs explicit control of the DSP's reset line.
To support this, a new DaVinci specific API is added.

This private API will disappear with DT migration.  Some discussion
regarding a proposed DT "reset" binding is here:
https://patchwork.kernel.org/patch/1635051/

Modify davinci_clk_init() to set clk "reset" function for clocks
that indicate PSC_LRST support.  Also fix indentation issue with
function opening curly brace.

Signed-off-by: Robert Tivy <rtivy@ti.com>
[nsekhar@ti.com: rename davinci_psc_config_reset() to davinci_psc_reset()]
Signed-off-by: Sekhar Nori <nsekhar@ti.com>

2 files changed, 6 insertions, 0 deletions

diff --git a/arch/arm/mach-davinci/include/mach/clock.h b/arch/arm/mach-davinci/include/mach/clock.h
index a3b040219876..3e8af6a0b64c 100644
--- a/arch/arm/mach-davinci/include/mach/clock.h
+++ b/arch/arm/mach-davinci/include/mach/clock.h
@@ -18,4 +18,7 @@ struct clk;
 extern int clk_register(struct clk *clk);
 extern void clk_unregister(struct clk *clk);
 
+int davinci_clk_reset_assert(struct clk *c);
+int davinci_clk_reset_deassert(struct clk *c);
+
 #endif
diff --git a/arch/arm/mach-davinci/include/mach/psc.h b/arch/arm/mach-davinci/include/mach/psc.h
index 40a0027838e8..0a22710493fd 100644
--- a/arch/arm/mach-davinci/include/mach/psc.h
+++ b/arch/arm/mach-davinci/include/mach/psc.h
@@ -246,6 +246,7 @@
 
 #define MDSTAT_STATE_MASK       0x3f
 #define PDSTAT_STATE_MASK       0x1f
+#define MDCTL_LRST              BIT(8)
 #define MDCTL_FORCE             BIT(31)
 #define PDCTL_NEXT              BIT(0)
 #define PDCTL_EPCGOOD           BIT(8)
@@ -253,6 +254,8 @@
 #ifndef __ASSEMBLER__
 
 extern int davinci_psc_is_clk_active(unsigned int ctlr, unsigned int id);
+extern void davinci_psc_reset(unsigned int ctlr, unsigned int id,
+                bool reset);
 extern void davinci_psc_config(unsigned int domain, unsigned int ctlr,
                 unsigned int id, bool enable, u32 flags);