Uses the 'magic_keys' idiom as described in doc/README.kbd:
http://lists.denx.de/pipermail/u-boot/2012-April/122502.html
Signed-off-by: Eric Nelson <eric.nel...@boundarydevices.com>
Acked-by: Marek Vasut <ma...@denx.de>
---
board/freescale/mx6qsabrelite/mx6qsabrelite.c | 122 ++++++++++++++++++++++++-
include/configs/mx6qsabrelite.h | 3 +
2 files changed, 123 insertions(+), 2 deletions(-)
diff --git a/board/freescale/mx6qsabrelite/mx6qsabrelite.c
b/board/freescale/mx6qsabrelite/mx6qsabrelite.c
index db5e775..f63cef7 100644
--- a/board/freescale/mx6qsabrelite/mx6qsabrelite.c
+++ b/board/freescale/mx6qsabrelite/mx6qsabrelite.c
@@ -52,6 +52,10 @@ DECLARE_GLOBAL_DATA_PTR;
PAD_CTL_PUS_100K_DOWN | PAD_CTL_SPEED_MED | \
PAD_CTL_DSE_40ohm | PAD_CTL_SRE_FAST)
+#define BUTTON_PAD_CTRL (PAD_CTL_PKE | PAD_CTL_PUE | \
+ PAD_CTL_PUS_100K_UP | PAD_CTL_SPEED_MED | \
+ PAD_CTL_DSE_40ohm | PAD_CTL_HYS)
+
int dram_init(void)
{
gd->ram_size = get_ram_size((void *)PHYS_SDRAM, PHYS_SDRAM_SIZE);
@@ -124,6 +128,22 @@ iomux_v3_cfg_t enet_pads2[] = {
MX6Q_PAD_RGMII_RX_CTL__RGMII_RX_CTL | MUX_PAD_CTRL(ENET_PAD_CTRL),
};
+/* Button assignments for J14 */
+static iomux_v3_cfg_t button_pads[] = {
+ /* Menu */
+ MX6Q_PAD_NANDF_D1__GPIO_2_1 | MUX_PAD_CTRL(BUTTON_PAD_CTRL),
+ /* Back */
+ MX6Q_PAD_NANDF_D2__GPIO_2_2 | MUX_PAD_CTRL(BUTTON_PAD_CTRL),
+ /* Labelled Search (mapped to Power under Android) */
+ MX6Q_PAD_NANDF_D3__GPIO_2_3 | MUX_PAD_CTRL(BUTTON_PAD_CTRL),
+ /* Home */
+ MX6Q_PAD_NANDF_D4__GPIO_2_4 | MUX_PAD_CTRL(BUTTON_PAD_CTRL),
+ /* Volume Down */
+ MX6Q_PAD_GPIO_19__GPIO_4_5 | MUX_PAD_CTRL(BUTTON_PAD_CTRL),
+ /* Volume Up */
+ MX6Q_PAD_GPIO_18__GPIO_7_13 | MUX_PAD_CTRL(BUTTON_PAD_CTRL),
+};
+
static void setup_iomux_enet(void)
{
gpio_direction_output(87, 0); /* GPIO 3-23 */
@@ -295,11 +315,18 @@ int setup_sata(void)
}
#endif
+static void setup_buttons(void)
+{
+ imx_iomux_v3_setup_multiple_pads(button_pads,
+ ARRAY_SIZE(button_pads));
+}
+
int board_early_init_f(void)
{
- setup_iomux_uart();
+ setup_iomux_uart();
+ setup_buttons();
- return 0;
+ return 0;
}
int board_init(void)
@@ -324,3 +351,94 @@ int checkboard(void)
return 0;
}
+
+struct button_key {
+ char const *name;
+ unsigned gpnum;
+ char ident;
+};
+
+static struct button_key const buttons[] = {
+ {"back", GPIO_NUMBER(2, 2), 'B'},
+ {"home", GPIO_NUMBER(2, 4), 'H'},
+ {"menu", GPIO_NUMBER(2, 1), 'M'},
+ {"search", GPIO_NUMBER(2, 3), 'S'},
+ {"volup", GPIO_NUMBER(7, 13), 'V'},
+ {"voldown", GPIO_NUMBER(4, 5), 'v'},
+};
+
+/*
+ * generate a null-terminated string containing the buttons pressed
+ * returns number of keys pressed
+ */
+static int read_keys(char *buf)
+{
+ int i, numpressed = 0;
+ for (i = 0; i < ARRAY_SIZE(buttons); i++) {
+ if (!gpio_get_value(buttons[i].gpnum))
+ buf[numpressed++] = buttons[i].ident;
+ }
+ buf[numpressed] = '\0';
+ return numpressed;
+}
+
+static int do_kbd(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+{
+ char envvalue[ARRAY_SIZE(buttons)+1];
+ int numpressed = read_keys(envvalue);
+ setenv("keybd", envvalue);
+ return numpressed == 0;
+}
+
+U_BOOT_CMD(
+ kbd, 1, 1, do_kbd,
+ "Tests for keypresses, sets 'keybd' environment variable",
+ "Returns 0 (true) to shell if key is pressed."
+);
+
+#ifdef CONFIG_PREBOOT
+static char const kbd_magic_prefix[] = "key_magic";
+static char const kbd_command_prefix[] = "key_cmd";
+
+static void preboot_keys(void)
+{
+ int numpressed;
+ char keypress[ARRAY_SIZE(buttons)+1];
+ numpressed = read_keys(keypress);
+ if (numpressed) {
+ char *kbd_magic_keys = getenv("magic_keys");
+ char *suffix;
+ /*
+ * loop over all magic keys
+ */
+ for (suffix = kbd_magic_keys; *suffix; ++suffix) {
+ char *keys;
+ char magic[sizeof(kbd_magic_prefix) + 1];
+ sprintf(magic, "%s%c", kbd_magic_prefix, *suffix);
+ keys = getenv(magic);
+ if (keys) {
+ if (!strcmp(keys, keypress))
+ break;
+ }
+ }
+ if (*suffix) {
+ char cmd_name[sizeof(kbd_command_prefix) + 1];
+ char *cmd;
+ sprintf(cmd_name, "%s%c", kbd_command_prefix, *suffix);
+ cmd = getenv(cmd_name);
+ if (cmd) {
+ setenv("preboot", cmd);
+ return;
+ }
+ }
+ }
+}
+#endif
+
+int misc_init_r(void)
+{
+#ifdef CONFIG_PREBOOT
+ preboot_keys();
+#endif
+ return 0;
+}
diff --git a/include/configs/mx6qsabrelite.h b/include/configs/mx6qsabrelite.h
index 50b5c31..c0511c7 100644
--- a/include/configs/mx6qsabrelite.h
+++ b/include/configs/mx6qsabrelite.h
@@ -42,6 +42,7 @@
#define CONFIG_ARCH_CPU_INIT
#define CONFIG_BOARD_EARLY_INIT_F
+#define CONFIG_MISC_INIT_R
#define CONFIG_MXC_GPIO
#define CONFIG_MXC_UART
@@ -123,6 +124,8 @@
#define CONFIG_BOOTDELAY 3
+#define CONFIG_PREBOOT ""
+
#define CONFIG_LOADADDR 0x10800000
#define CONFIG_SYS_TEXT_BASE 0x17800000
--
1.7.9
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