From 849369d6c66d3054688672f97d31fceb8e8230fb Mon Sep 17 00:00:00 2001 From: root Date: Fri, 25 Dec 2015 04:40:36 +0000 Subject: initial_commit --- arch/arm/mach-pxa/magician.c | 773 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 773 insertions(+) create mode 100644 arch/arm/mach-pxa/magician.c (limited to 'arch/arm/mach-pxa/magician.c') diff --git a/arch/arm/mach-pxa/magician.c b/arch/arm/mach-pxa/magician.c new file mode 100644 index 00000000..e1920572 --- /dev/null +++ b/arch/arm/mach-pxa/magician.c @@ -0,0 +1,773 @@ +/* + * Support for HTC Magician PDA phones: + * i-mate JAM, O2 Xda mini, Orange SPV M500, Qtek s100, Qtek s110 + * and T-Mobile MDA Compact. + * + * Copyright (c) 2006-2007 Philipp Zabel + * + * Based on hx4700.c, spitz.c and others. + * + * 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. + * + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include + +#include +#include +#include +#include +#include +#include + +#include "devices.h" +#include "generic.h" + +static unsigned long magician_pin_config[] __initdata = { + + /* SDRAM and Static Memory I/O Signals */ + GPIO20_nSDCS_2, + GPIO21_nSDCS_3, + GPIO15_nCS_1, + GPIO78_nCS_2, /* PASIC3 */ + GPIO79_nCS_3, /* EGPIO CPLD */ + GPIO80_nCS_4, + GPIO33_nCS_5, + + /* I2C */ + GPIO117_I2C_SCL, + GPIO118_I2C_SDA, + + /* PWM 0 */ + GPIO16_PWM0_OUT, + + /* I2S */ + GPIO28_I2S_BITCLK_OUT, + GPIO29_I2S_SDATA_IN, + GPIO31_I2S_SYNC, + GPIO113_I2S_SYSCLK, + + /* SSP 1 */ + GPIO23_SSP1_SCLK, + GPIO24_SSP1_SFRM, + GPIO25_SSP1_TXD, + + /* SSP 2 */ + GPIO19_SSP2_SCLK, + GPIO14_SSP2_SFRM, + GPIO89_SSP2_TXD, + GPIO88_SSP2_RXD, + + /* MMC */ + GPIO32_MMC_CLK, + GPIO92_MMC_DAT_0, + GPIO109_MMC_DAT_1, + GPIO110_MMC_DAT_2, + GPIO111_MMC_DAT_3, + GPIO112_MMC_CMD, + + /* LCD */ + GPIOxx_LCD_TFT_16BPP, + + /* QCI */ + GPIO12_CIF_DD_7, + GPIO17_CIF_DD_6, + GPIO50_CIF_DD_3, + GPIO51_CIF_DD_2, + GPIO52_CIF_DD_4, + GPIO53_CIF_MCLK, + GPIO54_CIF_PCLK, + GPIO55_CIF_DD_1, + GPIO81_CIF_DD_0, + GPIO82_CIF_DD_5, + GPIO84_CIF_FV, + GPIO85_CIF_LV, + + /* Magician specific input GPIOs */ + GPIO9_GPIO, /* unknown */ + GPIO10_GPIO, /* GSM_IRQ */ + GPIO13_GPIO, /* CPLD_IRQ */ + GPIO107_GPIO, /* DS1WM_IRQ */ + GPIO108_GPIO, /* GSM_READY */ + GPIO115_GPIO, /* nPEN_IRQ */ + + /* I2C */ + GPIO117_I2C_SCL, + GPIO118_I2C_SDA, +}; + +/* + * IRDA + */ + +static struct pxaficp_platform_data magician_ficp_info = { + .gpio_pwdown = GPIO83_MAGICIAN_nIR_EN, + .transceiver_cap = IR_SIRMODE | IR_OFF, +}; + +/* + * GPIO Keys + */ + +#define INIT_KEY(_code, _gpio, _desc) \ + { \ + .code = KEY_##_code, \ + .gpio = _gpio, \ + .desc = _desc, \ + .type = EV_KEY, \ + .wakeup = 1, \ + } + +static struct gpio_keys_button magician_button_table[] = { + INIT_KEY(POWER, GPIO0_MAGICIAN_KEY_POWER, "Power button"), + INIT_KEY(ESC, GPIO37_MAGICIAN_KEY_HANGUP, "Hangup button"), + INIT_KEY(F10, GPIO38_MAGICIAN_KEY_CONTACTS, "Contacts button"), + INIT_KEY(CALENDAR, GPIO90_MAGICIAN_KEY_CALENDAR, "Calendar button"), + INIT_KEY(CAMERA, GPIO91_MAGICIAN_KEY_CAMERA, "Camera button"), + INIT_KEY(UP, GPIO93_MAGICIAN_KEY_UP, "Up button"), + INIT_KEY(DOWN, GPIO94_MAGICIAN_KEY_DOWN, "Down button"), + INIT_KEY(LEFT, GPIO95_MAGICIAN_KEY_LEFT, "Left button"), + INIT_KEY(RIGHT, GPIO96_MAGICIAN_KEY_RIGHT, "Right button"), + INIT_KEY(KPENTER, GPIO97_MAGICIAN_KEY_ENTER, "Action button"), + INIT_KEY(RECORD, GPIO98_MAGICIAN_KEY_RECORD, "Record button"), + INIT_KEY(VOLUMEUP, GPIO100_MAGICIAN_KEY_VOL_UP, "Volume up"), + INIT_KEY(VOLUMEDOWN, GPIO101_MAGICIAN_KEY_VOL_DOWN, "Volume down"), + INIT_KEY(PHONE, GPIO102_MAGICIAN_KEY_PHONE, "Phone button"), + INIT_KEY(PLAY, GPIO99_MAGICIAN_HEADPHONE_IN, "Headset button"), +}; + +static struct gpio_keys_platform_data gpio_keys_data = { + .buttons = magician_button_table, + .nbuttons = ARRAY_SIZE(magician_button_table), +}; + +static struct platform_device gpio_keys = { + .name = "gpio-keys", + .dev = { + .platform_data = &gpio_keys_data, + }, + .id = -1, +}; + + +/* + * EGPIO (Xilinx CPLD) + * + * 7 32-bit aligned 8-bit registers: 3x output, 1x irq, 3x input + */ + +static struct resource egpio_resources[] = { + [0] = { + .start = PXA_CS3_PHYS, + .end = PXA_CS3_PHYS + 0x20 - 1, + .flags = IORESOURCE_MEM, + }, + [1] = { + .start = gpio_to_irq(GPIO13_MAGICIAN_CPLD_IRQ), + .end = gpio_to_irq(GPIO13_MAGICIAN_CPLD_IRQ), + .flags = IORESOURCE_IRQ, + }, +}; + +static struct htc_egpio_chip egpio_chips[] = { + [0] = { + .reg_start = 0, + .gpio_base = MAGICIAN_EGPIO(0, 0), + .num_gpios = 24, + .direction = HTC_EGPIO_OUTPUT, + .initial_values = 0x40, /* EGPIO_MAGICIAN_GSM_RESET */ + }, + [1] = { + .reg_start = 4, + .gpio_base = MAGICIAN_EGPIO(4, 0), + .num_gpios = 24, + .direction = HTC_EGPIO_INPUT, + }, +}; + +static struct htc_egpio_platform_data egpio_info = { + .reg_width = 8, + .bus_width = 32, + .irq_base = IRQ_BOARD_START, + .num_irqs = 4, + .ack_register = 3, + .chip = egpio_chips, + .num_chips = ARRAY_SIZE(egpio_chips), +}; + +static struct platform_device egpio = { + .name = "htc-egpio", + .id = -1, + .resource = egpio_resources, + .num_resources = ARRAY_SIZE(egpio_resources), + .dev = { + .platform_data = &egpio_info, + }, +}; + +/* + * LCD - Toppoly TD028STEB1 or Samsung LTP280QV + */ + +static struct pxafb_mode_info toppoly_modes[] = { + { + .pixclock = 96153, + .bpp = 16, + .xres = 240, + .yres = 320, + .hsync_len = 11, + .vsync_len = 3, + .left_margin = 19, + .upper_margin = 2, + .right_margin = 10, + .lower_margin = 2, + .sync = 0, + }, +}; + +static struct pxafb_mode_info samsung_modes[] = { + { + .pixclock = 96153, + .bpp = 16, + .xres = 240, + .yres = 320, + .hsync_len = 8, + .vsync_len = 4, + .left_margin = 9, + .upper_margin = 4, + .right_margin = 9, + .lower_margin = 4, + .sync = FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, + }, +}; + +static void toppoly_lcd_power(int on, struct fb_var_screeninfo *si) +{ + pr_debug("Toppoly LCD power\n"); + + if (on) { + pr_debug("on\n"); + gpio_set_value(EGPIO_MAGICIAN_TOPPOLY_POWER, 1); + gpio_set_value(GPIO106_MAGICIAN_LCD_POWER_3, 1); + udelay(2000); + gpio_set_value(EGPIO_MAGICIAN_LCD_POWER, 1); + udelay(2000); + /* FIXME: enable LCDC here */ + udelay(2000); + gpio_set_value(GPIO104_MAGICIAN_LCD_POWER_1, 1); + udelay(2000); + gpio_set_value(GPIO105_MAGICIAN_LCD_POWER_2, 1); + } else { + pr_debug("off\n"); + msleep(15); + gpio_set_value(GPIO105_MAGICIAN_LCD_POWER_2, 0); + udelay(500); + gpio_set_value(GPIO104_MAGICIAN_LCD_POWER_1, 0); + udelay(1000); + gpio_set_value(GPIO106_MAGICIAN_LCD_POWER_3, 0); + gpio_set_value(EGPIO_MAGICIAN_LCD_POWER, 0); + } +} + +static void samsung_lcd_power(int on, struct fb_var_screeninfo *si) +{ + pr_debug("Samsung LCD power\n"); + + if (on) { + pr_debug("on\n"); + if (system_rev < 3) + gpio_set_value(GPIO75_MAGICIAN_SAMSUNG_POWER, 1); + else + gpio_set_value(EGPIO_MAGICIAN_LCD_POWER, 1); + mdelay(10); + gpio_set_value(GPIO106_MAGICIAN_LCD_POWER_3, 1); + mdelay(10); + gpio_set_value(GPIO104_MAGICIAN_LCD_POWER_1, 1); + mdelay(30); + gpio_set_value(GPIO105_MAGICIAN_LCD_POWER_2, 1); + mdelay(10); + } else { + pr_debug("off\n"); + mdelay(10); + gpio_set_value(GPIO105_MAGICIAN_LCD_POWER_2, 0); + mdelay(30); + gpio_set_value(GPIO104_MAGICIAN_LCD_POWER_1, 0); + mdelay(10); + gpio_set_value(GPIO106_MAGICIAN_LCD_POWER_3, 0); + mdelay(10); + if (system_rev < 3) + gpio_set_value(GPIO75_MAGICIAN_SAMSUNG_POWER, 0); + else + gpio_set_value(EGPIO_MAGICIAN_LCD_POWER, 0); + } +} + +static struct pxafb_mach_info toppoly_info = { + .modes = toppoly_modes, + .num_modes = 1, + .fixed_modes = 1, + .lcd_conn = LCD_COLOR_TFT_16BPP, + .pxafb_lcd_power = toppoly_lcd_power, +}; + +static struct pxafb_mach_info samsung_info = { + .modes = samsung_modes, + .num_modes = 1, + .fixed_modes = 1, + .lcd_conn = LCD_COLOR_TFT_16BPP | LCD_PCLK_EDGE_FALL |\ + LCD_ALTERNATE_MAPPING, + .pxafb_lcd_power = samsung_lcd_power, +}; + +/* + * Backlight + */ + +static int magician_backlight_init(struct device *dev) +{ + int ret; + + ret = gpio_request(EGPIO_MAGICIAN_BL_POWER, "BL_POWER"); + if (ret) + goto err; + ret = gpio_request(EGPIO_MAGICIAN_BL_POWER2, "BL_POWER2"); + if (ret) + goto err2; + return 0; + +err2: + gpio_free(EGPIO_MAGICIAN_BL_POWER); +err: + return ret; +} + +static int magician_backlight_notify(struct device *dev, int brightness) +{ + gpio_set_value(EGPIO_MAGICIAN_BL_POWER, brightness); + if (brightness >= 200) { + gpio_set_value(EGPIO_MAGICIAN_BL_POWER2, 1); + return brightness - 72; + } else { + gpio_set_value(EGPIO_MAGICIAN_BL_POWER2, 0); + return brightness; + } +} + +static void magician_backlight_exit(struct device *dev) +{ + gpio_free(EGPIO_MAGICIAN_BL_POWER); + gpio_free(EGPIO_MAGICIAN_BL_POWER2); +} + +static struct platform_pwm_backlight_data backlight_data = { + .pwm_id = 0, + .max_brightness = 272, + .dft_brightness = 100, + .pwm_period_ns = 30923, + .init = magician_backlight_init, + .notify = magician_backlight_notify, + .exit = magician_backlight_exit, +}; + +static struct platform_device backlight = { + .name = "pwm-backlight", + .id = -1, + .dev = { + .parent = &pxa27x_device_pwm0.dev, + .platform_data = &backlight_data, + }, +}; + +/* + * LEDs + */ + +static struct gpio_led gpio_leds[] = { + { + .name = "magician::vibra", + .default_trigger = "none", + .gpio = GPIO22_MAGICIAN_VIBRA_EN, + }, + { + .name = "magician::phone_bl", + .default_trigger = "backlight", + .gpio = GPIO103_MAGICIAN_LED_KP, + }, +}; + +static struct gpio_led_platform_data gpio_led_info = { + .leds = gpio_leds, + .num_leds = ARRAY_SIZE(gpio_leds), +}; + +static struct platform_device leds_gpio = { + .name = "leds-gpio", + .id = -1, + .dev = { + .platform_data = &gpio_led_info, + }, +}; + +static struct pasic3_led pasic3_leds[] = { + { + .led = { + .name = "magician:red", + .default_trigger = "ds2760-battery.0-charging", + }, + .hw_num = 0, + .bit2 = PASIC3_BIT2_LED0, + .mask = PASIC3_MASK_LED0, + }, + { + .led = { + .name = "magician:green", + .default_trigger = "ds2760-battery.0-charging-or-full", + }, + .hw_num = 1, + .bit2 = PASIC3_BIT2_LED1, + .mask = PASIC3_MASK_LED1, + }, + { + .led = { + .name = "magician:blue", + .default_trigger = "bluetooth", + }, + .hw_num = 2, + .bit2 = PASIC3_BIT2_LED2, + .mask = PASIC3_MASK_LED2, + }, +}; + +static struct pasic3_leds_machinfo pasic3_leds_info = { + .num_leds = ARRAY_SIZE(pasic3_leds), + .power_gpio = EGPIO_MAGICIAN_LED_POWER, + .leds = pasic3_leds, +}; + +/* + * PASIC3 with DS1WM + */ + +static struct resource pasic3_resources[] = { + [0] = { + .start = PXA_CS2_PHYS, + .end = PXA_CS2_PHYS + 0x1b, + .flags = IORESOURCE_MEM, + }, + /* No IRQ handler in the PASIC3, DS1WM needs an external IRQ */ + [1] = { + .start = gpio_to_irq(GPIO107_MAGICIAN_DS1WM_IRQ), + .end = gpio_to_irq(GPIO107_MAGICIAN_DS1WM_IRQ), + .flags = IORESOURCE_IRQ | IORESOURCE_IRQ_HIGHEDGE, + } +}; + +static struct pasic3_platform_data pasic3_platform_data = { + .led_pdata = &pasic3_leds_info, + .clock_rate = 4000000, +}; + +static struct platform_device pasic3 = { + .name = "pasic3", + .id = -1, + .num_resources = ARRAY_SIZE(pasic3_resources), + .resource = pasic3_resources, + .dev = { + .platform_data = &pasic3_platform_data, + }, +}; + +/* + * USB "Transceiver" + */ + +static struct resource gpio_vbus_resource = { + .flags = IORESOURCE_IRQ, + .start = IRQ_MAGICIAN_VBUS, + .end = IRQ_MAGICIAN_VBUS, +}; + +static struct gpio_vbus_mach_info gpio_vbus_info = { + .gpio_pullup = GPIO27_MAGICIAN_USBC_PUEN, + .gpio_vbus = EGPIO_MAGICIAN_CABLE_STATE_USB, +}; + +static struct platform_device gpio_vbus = { + .name = "gpio-vbus", + .id = -1, + .num_resources = 1, + .resource = &gpio_vbus_resource, + .dev = { + .platform_data = &gpio_vbus_info, + }, +}; + +/* + * External power + */ + +static int power_supply_init(struct device *dev) +{ + return gpio_request(EGPIO_MAGICIAN_CABLE_STATE_AC, "CABLE_STATE_AC"); +} + +static int magician_is_ac_online(void) +{ + return gpio_get_value(EGPIO_MAGICIAN_CABLE_STATE_AC); +} + +static void power_supply_exit(struct device *dev) +{ + gpio_free(EGPIO_MAGICIAN_CABLE_STATE_AC); +} + +static char *magician_supplicants[] = { + "ds2760-battery.0", "backup-battery" +}; + +static struct pda_power_pdata power_supply_info = { + .init = power_supply_init, + .is_ac_online = magician_is_ac_online, + .exit = power_supply_exit, + .supplied_to = magician_supplicants, + .num_supplicants = ARRAY_SIZE(magician_supplicants), +}; + +static struct resource power_supply_resources[] = { + [0] = { + .name = "ac", + .flags = IORESOURCE_IRQ | IORESOURCE_IRQ_HIGHEDGE | + IORESOURCE_IRQ_LOWEDGE, + .start = IRQ_MAGICIAN_VBUS, + .end = IRQ_MAGICIAN_VBUS, + }, + [1] = { + .name = "usb", + .flags = IORESOURCE_IRQ | IORESOURCE_IRQ_HIGHEDGE | + IORESOURCE_IRQ_LOWEDGE, + .start = IRQ_MAGICIAN_VBUS, + .end = IRQ_MAGICIAN_VBUS, + }, +}; + +static struct platform_device power_supply = { + .name = "pda-power", + .id = -1, + .dev = { + .platform_data = &power_supply_info, + }, + .resource = power_supply_resources, + .num_resources = ARRAY_SIZE(power_supply_resources), +}; + +/* + * Battery charger + */ + +static struct regulator_consumer_supply bq24022_consumers[] = { + { + .dev = &gpio_vbus.dev, + .supply = "vbus_draw", + }, + { + .dev = &power_supply.dev, + .supply = "ac_draw", + }, +}; + +static struct regulator_init_data bq24022_init_data = { + .constraints = { + .max_uA = 500000, + .valid_ops_mask = REGULATOR_CHANGE_CURRENT | REGULATOR_CHANGE_STATUS, + }, + .num_consumer_supplies = ARRAY_SIZE(bq24022_consumers), + .consumer_supplies = bq24022_consumers, +}; + +static struct bq24022_mach_info bq24022_info = { + .gpio_nce = GPIO30_MAGICIAN_BQ24022_nCHARGE_EN, + .gpio_iset2 = EGPIO_MAGICIAN_BQ24022_ISET2, + .init_data = &bq24022_init_data, +}; + +static struct platform_device bq24022 = { + .name = "bq24022", + .id = -1, + .dev = { + .platform_data = &bq24022_info, + }, +}; + +/* + * MMC/SD + */ + +static int magician_mci_init(struct device *dev, + irq_handler_t detect_irq, void *data) +{ + return request_irq(IRQ_MAGICIAN_SD, detect_irq, + IRQF_DISABLED | IRQF_SAMPLE_RANDOM, + "mmc card detect", data); +} + +static void magician_mci_exit(struct device *dev, void *data) +{ + free_irq(IRQ_MAGICIAN_SD, data); +} + +static struct pxamci_platform_data magician_mci_info = { + .ocr_mask = MMC_VDD_32_33|MMC_VDD_33_34, + .init = magician_mci_init, + .exit = magician_mci_exit, + .gpio_card_detect = -1, + .gpio_card_ro = EGPIO_MAGICIAN_nSD_READONLY, + .gpio_card_ro_invert = 1, + .gpio_power = EGPIO_MAGICIAN_SD_POWER, +}; + + +/* + * USB OHCI + */ + +static struct pxaohci_platform_data magician_ohci_info = { + .port_mode = PMM_PERPORT_MODE, + .flags = ENABLE_PORT1 | ENABLE_PORT3 | POWER_CONTROL_LOW, + .power_budget = 0, +}; + + +/* + * StrataFlash + */ + +static void magician_set_vpp(struct platform_device *pdev, int vpp) +{ + gpio_set_value(EGPIO_MAGICIAN_FLASH_VPP, vpp); +} + +static struct resource strataflash_resource = { + .start = PXA_CS0_PHYS, + .end = PXA_CS0_PHYS + SZ_64M - 1, + .flags = IORESOURCE_MEM, +}; + +static struct physmap_flash_data strataflash_data = { + .width = 4, + .set_vpp = magician_set_vpp, +}; + +static struct platform_device strataflash = { + .name = "physmap-flash", + .id = -1, + .resource = &strataflash_resource, + .num_resources = 1, + .dev = { + .platform_data = &strataflash_data, + }, +}; + +/* + * I2C + */ + +static struct i2c_pxa_platform_data i2c_info = { + .fast_mode = 1, +}; + +/* + * Platform devices + */ + +static struct platform_device *devices[] __initdata = { + &gpio_keys, + &egpio, + &backlight, + &pasic3, + &bq24022, + &gpio_vbus, + &power_supply, + &strataflash, + &leds_gpio, +}; + +static void __init magician_init(void) +{ + void __iomem *cpld; + int lcd_select; + int err; + + gpio_request(GPIO13_MAGICIAN_CPLD_IRQ, "CPLD_IRQ"); + gpio_request(GPIO107_MAGICIAN_DS1WM_IRQ, "DS1WM_IRQ"); + + pxa2xx_mfp_config(ARRAY_AND_SIZE(magician_pin_config)); + + pxa_set_ffuart_info(NULL); + pxa_set_btuart_info(NULL); + pxa_set_stuart_info(NULL); + + platform_add_devices(ARRAY_AND_SIZE(devices)); + + err = gpio_request(GPIO83_MAGICIAN_nIR_EN, "nIR_EN"); + if (!err) { + gpio_direction_output(GPIO83_MAGICIAN_nIR_EN, 1); + pxa_set_ficp_info(&magician_ficp_info); + } + pxa27x_set_i2c_power_info(NULL); + pxa_set_i2c_info(&i2c_info); + pxa_set_mci_info(&magician_mci_info); + pxa_set_ohci_info(&magician_ohci_info); + + /* Check LCD type we have */ + cpld = ioremap_nocache(PXA_CS3_PHYS, 0x1000); + if (cpld) { + u8 board_id = __raw_readb(cpld+0x14); + iounmap(cpld); + system_rev = board_id & 0x7; + lcd_select = board_id & 0x8; + pr_info("LCD type: %s\n", lcd_select ? "Samsung" : "Toppoly"); + if (lcd_select && (system_rev < 3)) { + gpio_request(GPIO75_MAGICIAN_SAMSUNG_POWER, "SAMSUNG_POWER"); + gpio_direction_output(GPIO75_MAGICIAN_SAMSUNG_POWER, 0); + } + gpio_request(GPIO104_MAGICIAN_LCD_POWER_1, "LCD_POWER_1"); + gpio_request(GPIO105_MAGICIAN_LCD_POWER_2, "LCD_POWER_2"); + gpio_request(GPIO106_MAGICIAN_LCD_POWER_3, "LCD_POWER_3"); + gpio_direction_output(GPIO104_MAGICIAN_LCD_POWER_1, 0); + gpio_direction_output(GPIO105_MAGICIAN_LCD_POWER_2, 0); + gpio_direction_output(GPIO106_MAGICIAN_LCD_POWER_3, 0); + pxa_set_fb_info(NULL, lcd_select ? &samsung_info : &toppoly_info); + } else + pr_err("LCD detection: CPLD mapping failed\n"); +} + + +MACHINE_START(MAGICIAN, "HTC Magician") + .boot_params = 0xa0000100, + .map_io = pxa27x_map_io, + .nr_irqs = MAGICIAN_NR_IRQS, + .init_irq = pxa27x_init_irq, + .init_machine = magician_init, + .timer = &pxa_timer, +MACHINE_END -- cgit v1.2.3