Blackfin: BF51x/BF52x: support GPIO Hysteresis/Schmitt Trigger options

Newer parts have optional Hysteresis/Schmitt Trigger options to help with
dirty signals.  So add some kconfig options for tuning this and enable it
by default for people.

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>

5 files changed, 359 insertions, 0 deletions

diff --git a/arch/blackfin/kernel/setup.c b/arch/blackfin/kernel/setup.c
index d37a397f43f5..ac71dc15cbdb 100644
--- a/arch/blackfin/kernel/setup.c
+++ b/arch/blackfin/kernel/setup.c
@@ -864,6 +864,13 @@ void __init setup_arch(char **cmdline_p)
         bfin_write_EBIU_MODE(CONFIG_EBIU_MODEVAL);
         bfin_write_EBIU_FCTL(CONFIG_EBIU_FCTLVAL);
 #endif
+#ifdef CONFIG_BFIN_HYSTERESIS_CONTROL
+        bfin_write_PORTF_HYSTERISIS(HYST_PORTF_0_15);
+        bfin_write_PORTG_HYSTERISIS(HYST_PORTG_0_15);
+        bfin_write_PORTH_HYSTERISIS(HYST_PORTH_0_15);
+        bfin_write_MISCPORT_HYSTERISIS((bfin_read_MISCPORT_HYSTERISIS() &
+                                        ~HYST_NONEGPIO_MASK) | HYST_NONEGPIO);
+#endif
 
         cclk = get_cclk();
         sclk = get_sclk();
diff --git a/arch/blackfin/mach-bf518/Kconfig b/arch/blackfin/mach-bf518/Kconfig
index 4ab2d166c832..1d9f631a7f94 100644
--- a/arch/blackfin/mach-bf518/Kconfig
+++ b/arch/blackfin/mach-bf518/Kconfig
@@ -62,6 +62,67 @@ config BF518_UART1_PORTG
           PORT G
 endchoice
 
+comment "Hysteresis/Schmitt Trigger Control"
+config BFIN_HYSTERESIS_CONTROL
+        bool "Enable Hysteresis Control"
+        help
+          The ADSP-BF51x allows to control input hysteresis for Port F,
+          Port G and Port H and other processor signal inputs.
+          The Schmitt trigger enables can be set only for pin groups.
+          Saying Y will overwrite the default reset or boot loader
+          initialization.
+
+menu "PORT F"
+        depends on BFIN_HYSTERESIS_CONTROL
+config GPIO_HYST_PORTF_0_7
+        bool "Enable Hysteresis on PORTF {0...7}"
+config GPIO_HYST_PORTF_8_9
+        bool "Enable Hysteresis on PORTF {8, 9}"
+config GPIO_HYST_PORTF_10
+        bool "Enable Hysteresis on PORTF 10"
+config GPIO_HYST_PORTF_11
+        bool "Enable Hysteresis on PORTF 11"
+config GPIO_HYST_PORTF_12_13
+        bool "Enable Hysteresis on PORTF {12, 13}"
+config GPIO_HYST_PORTF_14_15
+        bool "Enable Hysteresis on PORTF {14, 15}"
+endmenu
+
+menu "PORT G"
+        depends on BFIN_HYSTERESIS_CONTROL
+config GPIO_HYST_PORTG_0
+        bool "Enable Hysteresis on PORTG 0"
+config GPIO_HYST_PORTG_1_4
+        bool "Enable Hysteresis on PORTG {1...4}"
+config GPIO_HYST_PORTG_5_6
+        bool "Enable Hysteresis on PORTG {5, 6}"
+config GPIO_HYST_PORTG_7_8
+        bool "Enable Hysteresis on PORTG {7, 8}"
+config GPIO_HYST_PORTG_9
+        bool "Enable Hysteresis on PORTG 9"
+config GPIO_HYST_PORTG_10
+        bool "Enable Hysteresis on PORTG 10"
+config GPIO_HYST_PORTG_11_13
+        bool "Enable Hysteresis on PORTG {11...13}"
+config GPIO_HYST_PORTG_14_15
+        bool "Enable Hysteresis on PORTG {14, 15}"
+endmenu
+
+menu "PORT H"
+        depends on BFIN_HYSTERESIS_CONTROL
+config GPIO_HYST_PORTH_0_7
+        bool "Enable Hysteresis on PORTH {0...7}"
+
+endmenu
+
+menu "None-GPIO"
+        depends on BFIN_HYSTERESIS_CONTROL
+config NONEGPIO_HYST_NMI_RST_BMODE
+        bool "Enable Hysteresis on {NMI, RESET, BMODE}"
+config NONEGPIO_HYST_JTAG
+        bool "Enable Hysteresis on JTAG"
+endmenu
+
 comment "Interrupt Priority Assignment"
 menu "Priority"
 
diff --git a/arch/blackfin/mach-bf518/include/mach/bf518.h b/arch/blackfin/mach-bf518/include/mach/bf518.h
index 856b330ecf0b..6906dee4f4cc 100644
--- a/arch/blackfin/mach-bf518/include/mach/bf518.h
+++ b/arch/blackfin/mach-bf518/include/mach/bf518.h
@@ -85,6 +85,111 @@
 
 #define AMGCTLVAL       (V_AMBEN | V_AMCKEN | V_CDPRIO)
 
+/**************************** Hysteresis Settings ****************************/
+
+#ifdef CONFIG_BFIN_HYSTERESIS_CONTROL
+#ifdef CONFIG_GPIO_HYST_PORTF_0_7
+#define HYST_PORTF_0_7          (1 << 0)
+#else
+#define HYST_PORTF_0_7          (0 << 0)
+#endif
+#ifdef CONFIG_GPIO_HYST_PORTF_8_9
+#define HYST_PORTF_8_9          (1 << 2)
+#else
+#define HYST_PORTF_8_9          (0 << 2)
+#endif
+#ifdef CONFIG_GPIO_HYST_PORTF_10
+#define HYST_PORTF_10           (1 << 4)
+#else
+#define HYST_PORTF_10           (0 << 4)
+#endif
+#ifdef CONFIG_GPIO_HYST_PORTF_11
+#define HYST_PORTF_11           (1 << 6)
+#else
+#define HYST_PORTF_11           (0 << 6)
+#endif
+#ifdef CONFIG_GPIO_HYST_PORTF_12_13
+#define HYST_PORTF_12_13        (1 << 8)
+#else
+#define HYST_PORTF_12_13        (0 << 8)
+#endif
+#ifdef CONFIG_GPIO_HYST_PORTF_14_15
+#define HYST_PORTF_14_15        (1 << 10)
+#else
+#define HYST_PORTF_14_15        (0 << 10)
+#endif
+
+#define HYST_PORTF_0_15 (HYST_PORTF_0_7 | HYST_PORTF_8_9 | HYST_PORTF_10 | \
+                HYST_PORTF_11 | HYST_PORTF_12_13 | HYST_PORTF_14_15)
+
+#ifdef CONFIG_GPIO_HYST_PORTG_0
+#define HYST_PORTG_0            (1 << 0)
+#else
+#define HYST_PORTG_0            (0 << 0)
+#endif
+#ifdef CONFIG_GPIO_HYST_PORTG_1_4
+#define HYST_PORTG_1_4          (1 << 2)
+#else
+#define HYST_PORTG_1_4          (0 << 2)
+#endif
+#ifdef CONFIG_GPIO_HYST_PORTG_5_6
+#define HYST_PORTG_5_6          (1 << 4)
+#else
+#define HYST_PORTG_5_6          (0 << 4)
+#endif
+#ifdef CONFIG_GPIO_HYST_PORTG_7_8
+#define HYST_PORTG_7_8          (1 << 6)
+#else
+#define HYST_PORTG_7_8          (0 << 6)
+#endif
+#ifdef CONFIG_GPIO_HYST_PORTG_9
+#define HYST_PORTG_9            (1 << 8)
+#else
+#define HYST_PORTG_9            (0 << 8)
+#endif
+#ifdef CONFIG_GPIO_HYST_PORTG_10
+#define HYST_PORTG_10           (1 << 10)
+#else
+#define HYST_PORTG_10           (0 << 10)
+#endif
+#ifdef CONFIG_GPIO_HYST_PORTG_11_13
+#define HYST_PORTG_11_13        (1 << 12)
+#else
+#define HYST_PORTG_11_13        (0 << 12)
+#endif
+#ifdef CONFIG_GPIO_HYST_PORTG_14_15
+#define HYST_PORTG_14_15        (1 << 14)
+#else
+#define HYST_PORTG_14_15        (0 << 14)
+#endif
+
+#define HYST_PORTG_0_15 (HYST_PORTG_0 | HYST_PORTG_1_4 | HYST_PORTG_5_6 | \
+                HYST_PORTG_7_8 | HYST_PORTG_9 | HYST_PORTG_10 | \
+                HYST_PORTG_11_13 | HYST_PORTG_14_15)
+
+#ifdef CONFIG_GPIO_HYST_PORTH_0_7
+#define HYST_PORTH_0_7          (1 << 0)
+#else
+#define HYST_PORTH_0_7          (0 << 0)
+#endif