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.nelson@boundarydevices.com --- V2 based on suggestion by Wolfgang to follow prior implementations.
board/freescale/mx6qsabrelite/mx6qsabrelite.c | 121 ++++++++++++++++++++++++- include/configs/mx6qsabrelite.h | 3 + 2 files changed, 122 insertions(+), 2 deletions(-)
diff --git a/board/freescale/mx6qsabrelite/mx6qsabrelite.c b/board/freescale/mx6qsabrelite/mx6qsabrelite.c index 1d09a72..9ca46e7 100644 --- a/board/freescale/mx6qsabrelite/mx6qsabrelite.c +++ b/board/freescale/mx6qsabrelite/mx6qsabrelite.c @@ -50,6 +50,10 @@ 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); @@ -122,6 +126,22 @@ 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 */ @@ -267,11 +287,18 @@ int board_eth_init(bd_t *bis) return 0; }
+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) @@ -292,3 +319,93 @@ 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 (0 == 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 0 == numpressed ; +} + +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 i, numpressed ; + char keypress[ARRAY_SIZE(buttons)+1]; + numpressed = read_keys(keypress); + if (0 != numpressed) { + char *kbd_magic_keys = getenv("magic_keys"); + char *suffix; + /* loop over all magic keys; + * use '\0' suffix in case of empty string + */ + 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 (0 != keys) { + if (0 == 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 +} diff --git a/include/configs/mx6qsabrelite.h b/include/configs/mx6qsabrelite.h index 8bc8a83..7bf8479 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 @@ -110,6 +111,8 @@
#define CONFIG_BOOTDELAY 3
+#define CONFIG_PREBOOT "" + #define CONFIG_LOADADDR 0x10800000 #define CONFIG_SYS_TEXT_BASE 0x17800000