omap: mux: Add new style pin multiplexing code for omap3

Initially only for 34xx. This code allows us to:

- Make the code more generic as the omap internal signal
  names can stay the same across omap generations for some
  devices

- Map mux registers to GPIO registers that is needed for
  dynamic muxing of pins during off-idle

- Override bootloader mux values via kernel cmdline using
  omap_mux=some.signa1=0x1234,some.signal2=0x1234

- View and set the mux registers via debugfs if
  CONFIG_DEBUG_FS is enabled

Cc: Mike Rapoport <mike@compulab.co.il>
Cc: Benoit Cousson <b-cousson@ti.com>
Signed-off-by: Paul Walmsley <paul@pwsan.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

1 files changed, 160 insertions, 0 deletions

diff --git a/arch/arm/mach-omap2/mux.h b/arch/arm/mach-omap2/mux.h
new file mode 100644
index 000000000000..bebe9cc60858
--- /dev/null
+++ b/arch/arm/mach-omap2/mux.h
@@ -0,0 +1,160 @@
+/*
+ * Copyright (C) 2009 Nokia
+ * Copyright (C) 2009 Texas Instruments
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#define OMAP_MUX_TERMINATOR     0xffff
+
+/* 34xx mux mode options for each pin. See TRM for options */
+#define OMAP_MUX_MODE0      0
+#define OMAP_MUX_MODE1      1
+#define OMAP_MUX_MODE2      2
+#define OMAP_MUX_MODE3      3
+#define OMAP_MUX_MODE4      4
+#define OMAP_MUX_MODE5      5
+#define OMAP_MUX_MODE6      6
+#define OMAP_MUX_MODE7      7
+
+/* 24xx/34xx mux bit defines */
+#define OMAP_PULL_ENA                   (1 << 3)
+#define OMAP_PULL_UP                    (1 << 4)
+#define OMAP_ALTELECTRICALSEL           (1 << 5)
+
+/* 34xx specific mux bit defines */
+#define OMAP_INPUT_EN                   (1 << 8)
+#define OMAP_OFF_EN                     (1 << 9)
+#define OMAP_OFFOUT_EN                  (1 << 10)
+#define OMAP_OFFOUT_VAL                 (1 << 11)
+#define OMAP_OFF_PULL_EN                (1 << 12)
+#define OMAP_OFF_PULL_UP                (1 << 13)
+#define OMAP_WAKEUP_EN                  (1 << 14)
+
+/* Active pin states */
+#define OMAP_PIN_OUTPUT                 0
+#define OMAP_PIN_INPUT                  OMAP_INPUT_EN
+#define OMAP_PIN_INPUT_PULLUP           (OMAP_PULL_ENA | OMAP_INPUT_EN \
+                                                | OMAP_PULL_UP)
+#define OMAP_PIN_INPUT_PULLDOWN         (OMAP_PULL_ENA | OMAP_INPUT_EN)
+
+/* Off mode states */
+#define OMAP_PIN_OFF_NONE               0
+#define OMAP_PIN_OFF_OUTPUT_HIGH        (OMAP_OFF_EN | OMAP_OFFOUT_EN \
+                                                | OMAP_OFFOUT_VAL)
+#define OMAP_PIN_OFF_OUTPUT_LOW         (OMAP_OFF_EN | OMAP_OFFOUT_EN)
+#define OMAP_PIN_OFF_INPUT_PULLUP       (OMAP_OFF_EN | OMAP_OFF_PULL_EN \
+                                                | OMAP_OFF_PULL_UP)
+#define OMAP_PIN_OFF_INPUT_PULLDOWN     (OMAP_OFF_EN | OMAP_OFF_PULL_EN)
+#define OMAP_PIN_OFF_WAKEUPENABLE       OMAP_WAKEUP_EN
+
+#define OMAP_MODE_GPIO(x)       (((x) & OMAP_MUX_MODE7) == OMAP_MUX_MODE4)
+
+/* Flags for omap_mux_init */
+#define OMAP_PACKAGE_MASK               0xffff
+#define OMAP_PACKAGE_CUS                3               /* 423-pin 0.65 */
+#define OMAP_PACKAGE_CBB                2               /* 515-pin 0.40 0.50 */
+#define OMAP_PACKAGE_CBC                1               /* 515-pin 0.50 0.65 */
+
+
+#define OMAP_MUX_NR_MODES       8                       /* Available modes */
+#define OMAP_MUX_NR_SIDES       2                       /* Bottom & top */
+
+/**
+ * struct omap_mux - data for omap mux register offset and it's value
+ * @reg_offset: mux register offset from the mux base
+ * @gpio:       GPIO number
+ * @muxnames:   available signal modes for a ball
+ */
+struct omap_mux {
+        u16     reg_offset;
+        u16     gpio;
+#ifdef CONFIG_OMAP_MUX
+        char    *muxnames[OMAP_MUX_NR_MODES];
+#ifdef CONFIG_DEBUG_FS
+        char    *balls[OMAP_MUX_NR_SIDES];
+#endif
+#endif
+};
+
+/**
+ * struct omap_ball - data for balls on omap package
+ * @reg_offset: mux register offset from the mux base
+ * @balls:      available balls on the package
+ */
+struct omap_ball {
+        u16     reg_offset;
+        char    *balls[OMAP_MUX_NR_SIDES];
+};
+
+/**
+ * struct omap_board_mux - data for initializing mux registers
+ * @reg_offset: mux register offset from the mux base
+ * @mux_value:  desired mux value to set
+ */
+struct omap_board_mux {
+        u16     reg_offset;
+        u16     value;
+};
+
+#if defined(CONFIG_OMAP_MUX) && defined(CONFIG_ARCH_OMAP34XX)
+
+/**
+ * omap_mux_init_gpio - initialize a signal based on the GPIO number
+ * @gpio:               GPIO number
+ * @val:                Options for the mux register value
+ */
+int omap_mux_init_gpio(int gpio, int val);
+
+/**
+ * omap_mux_init_signal - initialize a signal based on the signal name
+ * @muxname:            Mux name in mode0_name.signal_name format
+ * @val:                Options for the mux register value
+ */
+int omap_mux_init_signal(char *muxname, int val);
+
+#else
+
+static inline int omap_mux_init_gpio(int gpio, int val)
+{
+        return 0;
+}
+static inline int omap_mux_init_signal(char *muxname, int val)
+{
+        return 0;
+}
+
+#endif
+
+/**
+ * omap_mux_get_gpio() - get mux register value based on GPIO number
+ * @gpio:               GPIO number
+ *
+ */
+u16 omap_mux_get_gpio(int gpio);
+
+/**
+ * omap_mux_set_gpio() - set mux register value based on GPIO number
+ * @val:                New mux register value
+ * @gpio:               GPIO number
+ *
+ */
+void omap_mux_set_gpio(u16 val, int gpio);
+
+/**
+ * omap3_mux_init() - initialize mux system with board specific set
+ * @board_mux:          Board specific mux table
+ * @flags:              OMAP package type used for the board
+ */
+int omap3_mux_init(struct omap_board_mux *board_mux, int flags);
+
+/**
+ * omap_mux_init - private mux init function, do not call
+ */
+int omap_mux_init(u32 mux_pbase, u32 mux_size,
+                                struct omap_mux *superset,
+                                struct omap_mux *package_subset,
+                                struct omap_board_mux *board_mux,
+                                struct omap_ball *package_balls);