ARM: DRA7: Add support for IO delay configuration

On DRA7, in addition to the regular muxing of pins, an additional
hardware module called IODelay which is also expected to be
configured. This "IODelay" module has it's own register space that is
independent of the control module.

It is advocated strongly in TI's official documentation considering
the existing design of the DRA7 family of processors during mux or
IODelay recalibration, there is a potential for a significant glitch
which may cause functional impairment to certain hardware. It is
hence recommended to do muxing as part of IOdelay recalibration.

IODELAY recalibration sequence:
- Complete AVS voltage change on VDD_CORE_L
- Unlock IODLAY config registers.
- Perform IO delay calibration with predefined values.
- Isolate all the IOs
- Update the delay mechanism for each IO with new calibrated values.
- Configure PAD configuration registers
- De-isolate all the IOs.
- Relock IODELAY config registers.

Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
Signed-off-by: Nishanth Menon <nm@ti.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/arch/arm/include/asm/omap_common.h b/arch/arm/include/asm/omap_common.h
index 50f178bd58b..12c2207c275 100644
--- a/arch/arm/include/asm/omap_common.h
+++ b/arch/arm/include/asm/omap_common.h
@@ -313,6 +313,7 @@ struct prcm_regs {
 	u32 prm_rstctrl;
 	u32 prm_rstst;
 	u32 prm_rsttime;
+	u32 prm_io_pmctrl;
 	u32 prm_vc_val_bypass;
 	u32 prm_vc_cfg_i2c_mode;
 	u32 prm_vc_cfg_i2c_clk;
@@ -455,6 +456,8 @@ struct omap_sys_ctrl_regs {
 	u32 control_efuse_12;
 	u32 control_efuse_13;
 	u32 control_padconf_wkup_base;
+	u32 iodelay_config_base;
+	u32 ctrl_core_sma_sw_0;
 };
 
 struct dpll_params {
@@ -583,6 +586,7 @@ s8 abb_setup_ldovbb(u32 fuse, u32 ldovbb);
 
 void usb_fake_mac_from_die_id(u32 *id);
 void usb_set_serial_num_from_die_id(u32 *id);
+void recalibrate_iodelay(void);
 
 void omap_smc1(u32 service, u32 val);