ARM: OMAP2+: PRM: add generic API for asserting hardware reset

PRM driver now has a generic API for asserting hardware resets. SoC
specific support functions are registered through the prm_ll_data.
Signed-off-by: Tero Kristo <t-kristo@ti.com>
Acked-by: Paul Walmsley <paul@pwsan.com>
Tested-by: Nishanth Menon <nm@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/mach-omap2/omap_hwmod.c

@@ -2914,8 +2914,8 @@ static int _omap4_wait_target_ready(struct omap_hwmod *oh)
 static int _omap2_assert_hardreset(struct omap_hwmod *oh,
 				   struct omap_hwmod_rst_info *ohri)
 {
-	return omap2_prm_assert_hardreset(oh->prcm.omap2.module_offs,
-					  ohri->rst_shift);
+	return omap_prm_assert_hardreset(ohri->rst_shift, 0,
+					 oh->prcm.omap2.module_offs, 0);
 }
 
 /**
@@ -2974,10 +2974,10 @@ static int _omap4_assert_hardreset(struct omap_hwmod *oh,
 	if (!oh->clkdm)
 		return -EINVAL;
 
-	return omap4_prminst_assert_hardreset(ohri->rst_shift,
-				oh->clkdm->pwrdm.ptr->prcm_partition,
-				oh->clkdm->pwrdm.ptr->prcm_offs,
-				oh->prcm.omap4.rstctrl_offs);
+	return omap_prm_assert_hardreset(ohri->rst_shift,
+					 oh->clkdm->pwrdm.ptr->prcm_partition,
+					 oh->clkdm->pwrdm.ptr->prcm_offs,
+					 oh->prcm.omap4.rstctrl_offs);
 }
 
 /**
@@ -3047,9 +3047,9 @@ static int _am33xx_assert_hardreset(struct omap_hwmod *oh,
 				   struct omap_hwmod_rst_info *ohri)
 
 {
-	return am33xx_prm_assert_hardreset(ohri->rst_shift,
-				oh->clkdm->pwrdm.ptr->prcm_offs,
-				oh->prcm.omap4.rstctrl_offs);
+	return omap_prm_assert_hardreset(ohri->rst_shift, 0,
+					 oh->clkdm->pwrdm.ptr->prcm_offs,
+					 oh->prcm.omap4.rstctrl_offs);
 }
 
 /**

arch/arm/mach-omap2/prm.h

@@ -128,6 +128,7 @@ struct prm_reset_src_map {
  * @was_any_context_lost_old: ptr to the SoC PRM context loss test fn
  * @clear_context_loss_flags_old: ptr to the SoC PRM context loss flag clear fn
  * @late_init: ptr to the late init function
+ * @assert_hardreset: ptr to the SoC PRM hardreset assert impl
  *
  * XXX @was_any_context_lost_old and @clear_context_loss_flags_old are
  * deprecated.
@@ -137,11 +138,13 @@ struct prm_ll_data {
 	bool (*was_any_context_lost_old)(u8 part, s16 inst, u16 idx);
 	void (*clear_context_loss_flags_old)(u8 part, s16 inst, u16 idx);
 	int (*late_init)(void);
+	int (*assert_hardreset)(u8 shift, u8 part, s16 prm_mod, u16 offset);
 };
 
 extern int prm_register(struct prm_ll_data *pld);
 extern int prm_unregister(struct prm_ll_data *pld);
 
+int omap_prm_assert_hardreset(u8 shift, u8 part, s16 prm_mod, u16 offset);
 extern u32 prm_read_reset_sources(void);
 extern bool prm_was_any_context_lost_old(u8 part, s16 inst, u16 idx);
 extern void prm_clear_context_loss_flags_old(u8 part, s16 inst, u16 idx);

arch/arm/mach-omap2/prm2xxx.c

@@ -212,6 +212,7 @@ struct pwrdm_ops omap2_pwrdm_operations = {
 
 static struct prm_ll_data omap2xxx_prm_ll_data = {
 	.read_reset_sources = &omap2xxx_prm_read_reset_sources,
+	.assert_hardreset = &omap2_prm_assert_hardreset,
 };
 
 int __init omap2xxx_prm_init(void)

arch/arm/mach-omap2/prm2xxx_3xxx.c

@@ -39,8 +39,10 @@ int omap2_prm_is_hardreset_asserted(s16 prm_mod, u8 shift)
 
 /**
  * omap2_prm_assert_hardreset - assert the HW reset line of a submodule
- * @prm_mod: PRM submodule base (e.g. CORE_MOD)
  * @shift: register bit shift corresponding to the reset line to assert
+ * @part: PRM partition, ignored for OMAP2
+ * @prm_mod: PRM submodule base (e.g. CORE_MOD)
+ * @offset: register offset, ignored for OMAP2
  *
  * Some IPs like dsp or iva contain processors that require an HW
  * reset line to be asserted / deasserted in order to fully enable the
@@ -49,7 +51,7 @@ int omap2_prm_is_hardreset_asserted(s16 prm_mod, u8 shift)
  * place the submodule into reset.  Returns 0 upon success or -EINVAL
  * upon an argument error.
  */
-int omap2_prm_assert_hardreset(s16 prm_mod, u8 shift)
+int omap2_prm_assert_hardreset(u8 shift, u8 part, s16 prm_mod, u16 offset)
 {
 	u32 mask;
 

arch/arm/mach-omap2/prm2xxx_3xxx.h

@@ -101,7 +101,8 @@ static inline u32 omap2_prm_clear_mod_reg_bits(u32 bits, s16 module, s16 idx)
 
 /* These omap2_ PRM functions apply to both OMAP2 and 3 */
 extern int omap2_prm_is_hardreset_asserted(s16 prm_mod, u8 shift);
-extern int omap2_prm_assert_hardreset(s16 prm_mod, u8 shift);
+int omap2_prm_assert_hardreset(u8 shift, u8 part, s16 prm_mod,
+			       u16 offset);
 extern int omap2_prm_deassert_hardreset(s16 prm_mod, u8 rst_shift, u8 st_shift);
 
 extern int omap2_pwrdm_set_next_pwrst(struct powerdomain *pwrdm, u8 pwrst);

arch/arm/mach-omap2/prm33xx.c

@@ -73,6 +73,7 @@ int am33xx_prm_is_hardreset_asserted(u8 shift, s16 inst, u16 rstctrl_offs)
 /**
  * am33xx_prm_assert_hardreset - assert the HW reset line of a submodule
  * @shift: register bit shift corresponding to the reset line to assert
+ * @part: CM partition, ignored for AM33xx
  * @inst: CM instance register offset (*_INST macro)
  * @rstctrl_reg: RM_RSTCTRL register address for this module
  *
@@ -83,7 +84,8 @@ int am33xx_prm_is_hardreset_asserted(u8 shift, s16 inst, u16 rstctrl_offs)
  * place the submodule into reset.  Returns 0 upon success or -EINVAL
  * upon an argument error.
  */
-int am33xx_prm_assert_hardreset(u8 shift, s16 inst, u16 rstctrl_offs)
+static int am33xx_prm_assert_hardreset(u8 shift, u8 part, s16 inst,
+				       u16 rstctrl_offs)
 {
 	u32 mask = 1 << shift;
 
@@ -343,7 +345,9 @@ struct pwrdm_ops am33xx_pwrdm_operations = {
 	.pwrdm_has_voltdm		= am33xx_check_vcvp,
 };
 
-static struct prm_ll_data am33xx_prm_ll_data;
+static struct prm_ll_data am33xx_prm_ll_data = {
+	.assert_hardreset		= am33xx_prm_assert_hardreset,
+};
 
 int __init am33xx_prm_init(void)
 {

arch/arm/mach-omap2/prm33xx.h

@@ -124,7 +124,6 @@ extern u32 am33xx_prm_rmw_reg_bits(u32 mask, u32 bits, s16 inst, s16 idx);
 extern void am33xx_prm_global_warm_sw_reset(void);
 extern int am33xx_prm_is_hardreset_asserted(u8 shift, s16 inst,
 		u16 rstctrl_offs);
-extern int am33xx_prm_assert_hardreset(u8 shift, s16 inst, u16 rstctrl_offs);
 extern int am33xx_prm_deassert_hardreset(u8 shift, u8 st_shift, s16 inst,
 		u16 rstctrl_offs, u16 rstst_offs);
 int am33xx_prm_init(void);

arch/arm/mach-omap2/prm3xxx.c

@@ -664,6 +664,7 @@ static int omap3xxx_prm_late_init(void);
 static struct prm_ll_data omap3xxx_prm_ll_data = {
 	.read_reset_sources = &omap3xxx_prm_read_reset_sources,
 	.late_init = &omap3xxx_prm_late_init,
+	.assert_hardreset = &omap2_prm_assert_hardreset,
 };
 
 int __init omap3xxx_prm_init(void)

arch/arm/mach-omap2/prm44xx.c

@@ -688,6 +688,7 @@ static struct prm_ll_data omap44xx_prm_ll_data = {
 	.was_any_context_lost_old = &omap44xx_prm_was_any_context_lost_old,
 	.clear_context_loss_flags_old = &omap44xx_prm_clear_context_loss_flags_old,
 	.late_init = &omap44xx_prm_late_init,
+	.assert_hardreset	= omap4_prminst_assert_hardreset,
 };
 
 int __init omap44xx_prm_init(void)

arch/arm/mach-omap2/prm_common.c

@@ -422,6 +422,26 @@ void prm_clear_context_loss_flags_old(u8 part, s16 inst, u16 idx)
 			  __func__);
 }
 
+/**
+ * omap_prm_assert_hardreset - assert hardreset for an IP block
+ * @shift: register bit shift corresponding to the reset line
+ * @part: PRM partition
+ * @prm_mod: PRM submodule base or instance offset
+ * @offset: register offset
+ *
+ * Asserts a hardware reset line for an IP block.
+ */
+int omap_prm_assert_hardreset(u8 shift, u8 part, s16 prm_mod, u16 offset)
+{
+	if (!prm_ll_data->assert_hardreset) {
+		WARN_ONCE(1, "prm: %s: no mapping function defined\n",
+			  __func__);
+		return -EINVAL;
+	}
+
+	return prm_ll_data->assert_hardreset(shift, part, prm_mod, offset);
+}
+
 /**
  * prm_register - register per-SoC low-level data with the PRM
  * @pld: low-level per-SoC OMAP PRM data & function pointers to register