Add a driver for the SPI controller integrated on Apple SoCs. This is necessary to support the keyboard on Apple Silicon laopts since their keyboard uses an Apple-specific HID over SPI protocol.

Signed-off-by: Mark Kettenis kettenis@openbsd.org Reviewed-by: Simon Glass sjg@chromium.org Tested on: Macbook Air M1 Tested-by: Simon Glass sjg@chromium.org ---

ChangeLog:

v2: - Add comments

arch/arm/Kconfig | 2 + drivers/spi/Kconfig | 7 + drivers/spi/Makefile | 1 + drivers/spi/apple_spi.c | 285 ++++++++++++++++++++++++++++++++++++++++ 4 files changed, 295 insertions(+) create mode 100644 drivers/spi/apple_spi.c

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index 14c83ea19e..af0be00f6d 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -937,6 +937,7 @@ config ARCH_APPLE select DM_MAILBOX select DM_RESET select DM_SERIAL + select DM_SPI select DM_USB select DM_VIDEO select IOMMU @@ -946,6 +947,7 @@ config ARCH_APPLE select POSITION_INDEPENDENT select POWER_DOMAIN select REGMAP + select SPI select SYSCON select SYSRESET select SYSRESET_WATCHDOG diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig index d07e9a28af..0a6a85f9c4 100644 --- a/drivers/spi/Kconfig +++ b/drivers/spi/Kconfig @@ -50,6 +50,13 @@ config ALTERA_SPI IP core. Please find details on the "Embedded Peripherals IP User Guide" of Altera.

+config APPLE_SPI + bool "Apple SPI driver" + default y if ARCH_APPLE + help + Enable the Apple SPI driver. This driver can be used to + access the SPI flash and keyboard on machines based on Apple SoCs. + config ATCSPI200_SPI bool "Andestech ATCSPI200 SPI driver" help diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile index d2f24bccef..bea746f3e3 100644 --- a/drivers/spi/Makefile +++ b/drivers/spi/Makefile @@ -18,6 +18,7 @@ obj-$(CONFIG_SPI_MEM) += spi-mem-nodm.o endif

obj-$(CONFIG_ALTERA_SPI) += altera_spi.o +obj-$(CONFIG_APPLE_SPI) += apple_spi.o obj-$(CONFIG_ATH79_SPI) += ath79_spi.o obj-$(CONFIG_ATMEL_QSPI) += atmel-quadspi.o obj-$(CONFIG_ATMEL_SPI) += atmel_spi.o diff --git a/drivers/spi/apple_spi.c b/drivers/spi/apple_spi.c new file mode 100644 index 0000000000..f35f5af1f6 --- /dev/null +++ b/drivers/spi/apple_spi.c @@ -0,0 +1,285 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright (C) 2021 Mark Kettenis kettenis@openbsd.org + * Copyright The Asahi Linux Contributors + */ + +#include <common.h> +#include <dm.h> +#include <clk.h> +#include <spi.h> +#include <asm/io.h> +#include <linux/bitfield.h> +#include <linux/delay.h> + +#define APPLE_SPI_CTRL 0x000 +#define APPLE_SPI_CTRL_RUN BIT(0) +#define APPLE_SPI_CTRL_TX_RESET BIT(2) +#define APPLE_SPI_CTRL_RX_RESET BIT(3) + +#define APPLE_SPI_CFG 0x004 +#define APPLE_SPI_CFG_CPHA BIT(1) +#define APPLE_SPI_CFG_CPOL BIT(2) +#define APPLE_SPI_CFG_MODE GENMASK(6, 5) +#define APPLE_SPI_CFG_MODE_POLLED 0 +#define APPLE_SPI_CFG_MODE_IRQ 1 +#define APPLE_SPI_CFG_MODE_DMA 2 +#define APPLE_SPI_CFG_IE_RXCOMPLETE BIT(7) +#define APPLE_SPI_CFG_IE_TXRXTHRESH BIT(8) +#define APPLE_SPI_CFG_LSB_FIRST BIT(13) +#define APPLE_SPI_CFG_WORD_SIZE GENMASK(16, 15) +#define APPLE_SPI_CFG_WORD_SIZE_8B 0 +#define APPLE_SPI_CFG_WORD_SIZE_16B 1 +#define APPLE_SPI_CFG_WORD_SIZE_32B 2 +#define APPLE_SPI_CFG_FIFO_THRESH GENMASK(18, 17) +#define APPLE_SPI_CFG_FIFO_THRESH_8B 0 +#define APPLE_SPI_CFG_FIFO_THRESH_4B 1 +#define APPLE_SPI_CFG_FIFO_THRESH_1B 2 +#define APPLE_SPI_CFG_IE_TXCOMPLETE BIT(21) + +#define APPLE_SPI_STATUS 0x008 +#define APPLE_SPI_STATUS_RXCOMPLETE BIT(0) +#define APPLE_SPI_STATUS_TXRXTHRESH BIT(1) +#define APPLE_SPI_STATUS_TXCOMPLETE BIT(2) + +#define APPLE_SPI_PIN 0x00c +#define APPLE_SPI_PIN_KEEP_MOSI BIT(0) +#define APPLE_SPI_PIN_CS BIT(1) + +#define APPLE_SPI_TXDATA 0x010 +#define APPLE_SPI_RXDATA 0x020 +#define APPLE_SPI_CLKDIV 0x030 +#define APPLE_SPI_CLKDIV_MIN 0x002 +#define APPLE_SPI_CLKDIV_MAX 0x7ff +#define APPLE_SPI_RXCNT 0x034 +#define APPLE_SPI_WORD_DELAY 0x038 +#define APPLE_SPI_TXCNT 0x04c + +#define APPLE_SPI_FIFOSTAT 0x10c +#define APPLE_SPI_FIFOSTAT_TXFULL BIT(4) +#define APPLE_SPI_FIFOSTAT_LEVEL_TX GENMASK(15, 8) +#define APPLE_SPI_FIFOSTAT_RXEMPTY BIT(20) +#define APPLE_SPI_FIFOSTAT_LEVEL_RX GENMASK(31, 24) + +#define APPLE_SPI_IE_XFER 0x130 +#define APPLE_SPI_IF_XFER 0x134 +#define APPLE_SPI_XFER_RXCOMPLETE BIT(0) +#define APPLE_SPI_XFER_TXCOMPLETE BIT(1) + +#define APPLE_SPI_IE_FIFO 0x138 +#define APPLE_SPI_IF_FIFO 0x13c +#define APPLE_SPI_FIFO_RXTHRESH BIT(4) +#define APPLE_SPI_FIFO_TXTHRESH BIT(5) +#define APPLE_SPI_FIFO_RXFULL BIT(8) +#define APPLE_SPI_FIFO_TXEMPTY BIT(9) +#define APPLE_SPI_FIFO_RXUNDERRUN BIT(16) +#define APPLE_SPI_FIFO_TXOVERFLOW BIT(17) + +#define APPLE_SPI_SHIFTCFG 0x150 +#define APPLE_SPI_SHIFTCFG_CLK_ENABLE BIT(0) +#define APPLE_SPI_SHIFTCFG_CS_ENABLE BIT(1) +#define APPLE_SPI_SHIFTCFG_AND_CLK_DATA BIT(8) +#define APPLE_SPI_SHIFTCFG_CS_AS_DATA BIT(9) +#define APPLE_SPI_SHIFTCFG_TX_ENABLE BIT(10) +#define APPLE_SPI_SHIFTCFG_RX_ENABLE BIT(11) +#define APPLE_SPI_SHIFTCFG_BITS GENMASK(21, 16) +#define APPLE_SPI_SHIFTCFG_OVERRIDE_CS BIT(24) + +#define APPLE_SPI_PINCFG 0x154 +#define APPLE_SPI_PINCFG_KEEP_CLK BIT(0) +#define APPLE_SPI_PINCFG_KEEP_CS BIT(1) +#define APPLE_SPI_PINCFG_KEEP_MOSI BIT(2) +#define APPLE_SPI_PINCFG_CLK_IDLE_VAL BIT(8) +#define APPLE_SPI_PINCFG_CS_IDLE_VAL BIT(9) +#define APPLE_SPI_PINCFG_MOSI_IDLE_VAL BIT(10) + +#define APPLE_SPI_DELAY_PRE 0x160 +#define APPLE_SPI_DELAY_POST 0x168 +#define APPLE_SPI_DELAY_ENABLE BIT(0) +#define APPLE_SPI_DELAY_NO_INTERBYTE BIT(1) +#define APPLE_SPI_DELAY_SET_SCK BIT(4) +#define APPLE_SPI_DELAY_SET_MOSI BIT(6) +#define APPLE_SPI_DELAY_SCK_VAL BIT(8) +#define APPLE_SPI_DELAY_MOSI_VAL BIT(12) + +#define APPLE_SPI_FIFO_DEPTH 16 + +#define APPLE_SPI_TIMEOUT_MS 200 + +struct apple_spi_priv { + void *base; + u32 clkfreq; /* Input clock frequency */ +}; + +static void apple_spi_set_cs(struct apple_spi_priv *priv, int on) +{ + writel(on ? 0 : APPLE_SPI_PIN_CS, priv->base + APPLE_SPI_PIN); +} + +/* Fill Tx FIFO. */ +static void apple_spi_tx(struct apple_spi_priv *priv, uint *len, + const void **dout) +{ + const u8 *out = *dout; + u32 data, fifostat; + uint count; + + fifostat = readl(priv->base + APPLE_SPI_FIFOSTAT); + count = APPLE_SPI_FIFO_DEPTH - + FIELD_GET(APPLE_SPI_FIFOSTAT_LEVEL_TX, fifostat); + while (*len > 0 && count > 0) { + data = out ? *out++ : 0; + writel(data, priv->base + APPLE_SPI_TXDATA); + (*len)--; + count--; + } + + *dout = out; +} + +/* Empty Rx FIFO. */ +static void apple_spi_rx(struct apple_spi_priv *priv, uint *len, + void **din) +{ + u8 *in = *din; + u32 data, fifostat; + uint count; + + fifostat = readl(priv->base + APPLE_SPI_FIFOSTAT); + count = FIELD_GET(APPLE_SPI_FIFOSTAT_LEVEL_RX, fifostat); + while (*len > 0 && count > 0) { + data = readl(priv->base + APPLE_SPI_RXDATA); + if (in) + *in++ = data; + (*len)--; + count--; + } + + *din = in; +} + +static int apple_spi_xfer(struct udevice *dev, unsigned int bitlen, + const void *dout, void *din, unsigned long flags) +{ + struct apple_spi_priv *priv = dev_get_priv(dev->parent); + unsigned long start = get_timer(0); + uint txlen, rxlen; + int ret = 0; + + if ((bitlen % 8) != 0) + return -EINVAL; + txlen = rxlen = bitlen / 8; + + if (flags & SPI_XFER_BEGIN) + apple_spi_set_cs(priv, 1); + + if (txlen > 0) { + /* Reset FIFOs */ + writel(APPLE_SPI_CTRL_RX_RESET | APPLE_SPI_CTRL_TX_RESET, + priv->base + APPLE_SPI_CTRL); + + /* Set the transfer length */ + writel(txlen, priv->base + APPLE_SPI_TXCNT); + writel(rxlen, priv->base + APPLE_SPI_RXCNT); + + /* Prime transmit FIFO */ + apple_spi_tx(priv, &txlen, &dout); + + /* Start transfer */ + writel(APPLE_SPI_CTRL_RUN, priv->base + APPLE_SPI_CTRL); + + while ((txlen > 0 || rxlen > 0)) { + apple_spi_rx(priv, &rxlen, &din); + apple_spi_tx(priv, &txlen, &dout); + + if (get_timer(start) > APPLE_SPI_TIMEOUT_MS) { + ret = -ETIMEDOUT; + break; + } + } + + /* Stop transfer. */ + writel(0, priv->base + APPLE_SPI_CTRL); + } + + if (flags & SPI_XFER_END) + apple_spi_set_cs(priv, 0); + + return ret; +} + +static int apple_spi_set_speed(struct udevice *dev, uint speed) +{ + struct apple_spi_priv *priv = dev_get_priv(dev); + u32 div; + + div = DIV_ROUND_UP(priv->clkfreq, speed); + if (div < APPLE_SPI_CLKDIV_MIN) + div = APPLE_SPI_CLKDIV_MIN; + if (div > APPLE_SPI_CLKDIV_MAX) + div = APPLE_SPI_CLKDIV_MAX; + + writel(div, priv->base + APPLE_SPI_CLKDIV); + + return 0; +} + +static int apple_spi_set_mode(struct udevice *bus, uint mode) +{ + return 0; +} + +struct dm_spi_ops apple_spi_ops = { + .xfer = apple_spi_xfer, + .set_speed = apple_spi_set_speed, + .set_mode = apple_spi_set_mode, +}; + +static int apple_spi_probe(struct udevice *dev) +{ + struct apple_spi_priv *priv = dev_get_priv(dev); + struct clk clkdev; + int ret; + + priv->base = dev_read_addr_ptr(dev); + if (!priv->base) + return -EINVAL; + + ret = clk_get_by_index(dev, 0, &clkdev); + if (ret) + return ret; + priv->clkfreq = clk_get_rate(&clkdev); + + /* Set CS high (inactive) and disable override and auto-CS */ + writel(APPLE_SPI_PIN_CS, priv->base + APPLE_SPI_PIN); + writel(readl(priv->base + APPLE_SPI_SHIFTCFG) & ~APPLE_SPI_SHIFTCFG_OVERRIDE_CS, + priv->base + APPLE_SPI_SHIFTCFG); + writel((readl(priv->base + APPLE_SPI_PINCFG) & ~APPLE_SPI_PINCFG_CS_IDLE_VAL) | + APPLE_SPI_PINCFG_KEEP_CS, priv->base + APPLE_SPI_PINCFG); + + /* Reset FIFOs */ + writel(APPLE_SPI_CTRL_RX_RESET | APPLE_SPI_CTRL_TX_RESET, + priv->base + APPLE_SPI_CTRL); + + /* Configure defaults */ + writel(FIELD_PREP(APPLE_SPI_CFG_MODE, APPLE_SPI_CFG_MODE_IRQ) | + FIELD_PREP(APPLE_SPI_CFG_WORD_SIZE, APPLE_SPI_CFG_WORD_SIZE_8B) | + FIELD_PREP(APPLE_SPI_CFG_FIFO_THRESH, APPLE_SPI_CFG_FIFO_THRESH_8B), + priv->base + APPLE_SPI_CFG); + + return 0; +} + +static const struct udevice_id apple_spi_of_match[] = { + { .compatible = "apple,spi" }, + { /* sentinel */ } +}; + +U_BOOT_DRIVER(apple_spi) = { + .name = "apple_spi", + .id = UCLASS_SPI, + .of_match = apple_spi_of_match, + .probe = apple_spi_probe, + .priv_auto = sizeof(struct apple_spi_priv), + .ops = &apple_spi_ops, +};

This driver adds support for the keyboard on Apple Silicon laptops. The controller for this keyboard sits on an SPI bus and uses an Apple-specific HID over SPI protocol. The packets sent by this controller for key presses and key releases are fairly simple and are decoded directly by the code in this driver and converted into standard Linux keycodes. The same controller handles the touchpad found on these laptops. Packets for touchpad events are simply ignored.

Signed-off-by: Mark Kettenis kettenis@openbsd.org Reviewed-by: Simon Glass sjg@chromium.org Tested on: Macbook Air M1 Tested-by: Simon Glass sjg@chromium.org ---

ChangeLog:

v2: - Drop delay after enabling controller - Check for errors in spi calls - Add comments

configs/apple_m1_defconfig | 1 + drivers/input/Kconfig | 8 + drivers/input/Makefile | 1 + drivers/input/apple_spi_kbd.c | 271 ++++++++++++++++++++++++++++++++++ include/configs/apple.h | 2 +- 5 files changed, 282 insertions(+), 1 deletion(-) create mode 100644 drivers/input/apple_spi_kbd.c

diff --git a/configs/apple_m1_defconfig b/configs/apple_m1_defconfig index 1528217b17..433cc62334 100644 --- a/configs/apple_m1_defconfig +++ b/configs/apple_m1_defconfig @@ -15,5 +15,6 @@ CONFIG_NVME_APPLE=y CONFIG_USB_XHCI_HCD=y CONFIG_USB_XHCI_DWC3=y CONFIG_USB_KEYBOARD=y +CONFIG_APPLE_SPI_KEYB=y CONFIG_VIDEO_SIMPLE=y # CONFIG_GENERATE_SMBIOS_TABLE is not set diff --git a/drivers/input/Kconfig b/drivers/input/Kconfig index 0b753f37bf..2718b3674a 100644 --- a/drivers/input/Kconfig +++ b/drivers/input/Kconfig @@ -47,6 +47,14 @@ config KEYBOARD and is only used by novena. For new boards, use driver model instead.

+config APPLE_SPI_KEYB + bool "Enable Apple SPI keyboard support" + depends on DM_KEYBOARD && DM_SPI + help + This adds a driver for the keyboards found on various + laptops based on Apple SoCs. These keyboards use an + Apple-specific HID-over-SPI protocol. + config CROS_EC_KEYB bool "Enable Chrome OS EC keyboard support" depends on INPUT diff --git a/drivers/input/Makefile b/drivers/input/Makefile index e440c921e4..b1133f772f 100644 --- a/drivers/input/Makefile +++ b/drivers/input/Makefile @@ -10,6 +10,7 @@ obj-$(CONFIG_$(SPL_TPL_)DM_KEYBOARD) += input.o keyboard-uclass.o

ifndef CONFIG_SPL_BUILD

+obj-$(CONFIG_APPLE_SPI_KEYB) += apple_spi_kbd.o obj-$(CONFIG_I8042_KEYB) += i8042.o obj-$(CONFIG_TEGRA_KEYBOARD) += input.o tegra-kbc.o obj-$(CONFIG_TWL4030_INPUT) += twl4030.o diff --git a/drivers/input/apple_spi_kbd.c b/drivers/input/apple_spi_kbd.c new file mode 100644 index 0000000000..7cf12f453a --- /dev/null +++ b/drivers/input/apple_spi_kbd.c @@ -0,0 +1,271 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright (C) 2021 Mark Kettenis kettenis@openbsd.org + */ + +#include <common.h> +#include <dm.h> +#include <keyboard.h> +#include <spi.h> +#include <stdio_dev.h> +#include <asm-generic/gpio.h> +#include <linux/delay.h> +#include <linux/input.h> + +/* + * The Apple SPI keyboard controller implements a protocol that + * closely resembles HID Keyboard Boot protocol. The key codes are + * mapped according to the HID Keyboard/Keypad Usage Table. + */ + +/* Modifier key bits */ +#define HID_MOD_LEFTCTRL BIT(0) +#define HID_MOD_LEFTSHIFT BIT(1) +#define HID_MOD_LEFTALT BIT(2) +#define HID_MOD_LEFTGUI BIT(3) +#define HID_MOD_RIGHTCTRL BIT(4) +#define HID_MOD_RIGHTSHIFT BIT(5) +#define HID_MOD_RIGHTALT BIT(6) +#define HID_MOD_RIGHTGUI BIT(7) + +static const u8 hid_kbd_keymap[] = { + KEY_RESERVED, 0xff, 0xff, 0xff, + KEY_A, KEY_B, KEY_C, KEY_D, + KEY_E, KEY_F, KEY_G, KEY_H, + KEY_I, KEY_J, KEY_K, KEY_L, + KEY_M, KEY_N, KEY_O, KEY_P, + KEY_Q, KEY_R, KEY_S, KEY_T, + KEY_U, KEY_V, KEY_W, KEY_X, + KEY_Y, KEY_Z, KEY_1, KEY_2, + KEY_3, KEY_4, KEY_5, KEY_6, + KEY_7, KEY_8, KEY_9, KEY_0, + KEY_ENTER, KEY_ESC, KEY_BACKSPACE, KEY_TAB, + KEY_SPACE, KEY_MINUS, KEY_EQUAL, KEY_LEFTBRACE, + KEY_RIGHTBRACE, KEY_BACKSLASH, 0xff, KEY_SEMICOLON, + KEY_APOSTROPHE, KEY_GRAVE, KEY_COMMA, KEY_DOT, + KEY_SLASH, KEY_CAPSLOCK, KEY_F1, KEY_F2, + KEY_F3, KEY_F4, KEY_F5, KEY_F6, + KEY_F7, KEY_F8, KEY_F9, KEY_F10, + KEY_F11, KEY_F12, KEY_SYSRQ, KEY_SCROLLLOCK, + KEY_PAUSE, KEY_INSERT, KEY_HOME, KEY_PAGEUP, + KEY_DELETE, KEY_END, KEY_PAGEDOWN, KEY_RIGHT, + KEY_LEFT, KEY_DOWN, KEY_UP, KEY_NUMLOCK, + KEY_KPSLASH, KEY_KPASTERISK, KEY_KPMINUS, KEY_KPPLUS, + KEY_KPENTER, KEY_KP1, KEY_KP2, KEY_KP3, + KEY_KP4, KEY_KP5, KEY_KP6, KEY_KP7, + KEY_KP8, KEY_KP9, KEY_KP0, KEY_KPDOT, + KEY_BACKSLASH, KEY_COMPOSE, KEY_POWER, KEY_KPEQUAL, +}; + +/* Report ID used for keyboard input reports. */ +#define KBD_REPORTID 0x01 + +struct apple_spi_kbd_report { + u8 reportid; + u8 modifiers; + u8 reserved; + u8 keycode[6]; + u8 fn; +}; + +struct apple_spi_kbd_priv { + struct gpio_desc enable; + struct apple_spi_kbd_report old; /* previous keyboard input report */ + struct apple_spi_kbd_report new; /* current keyboard input report */ +}; + +/* Keyboard device. */ +#define KBD_DEVICE 0x01 + +/* The controller sends us fixed-size packets of 256 bytes. */ +struct apple_spi_kbd_packet { + u8 flags; +#define PACKET_READ 0x20 + u8 device; + u16 offset; + u16 remaining; + u16 len; + u8 data[246]; + u16 crc; +}; + +/* Packets contain a single variable-sized message. */ +struct apple_spi_kbd_msg { + u8 type; +#define MSG_REPORT 0x10 + u8 device; + u8 unknown; + u8 msgid; + u16 rsplen; + u16 cmdlen; + u8 data[0]; +}; + +static void apple_spi_kbd_service_modifiers(struct input_config *input) +{ + struct apple_spi_kbd_priv *priv = dev_get_priv(input->dev); + u8 new = priv->new.modifiers; + u8 old = priv->old.modifiers; + + if ((new ^ old) & HID_MOD_LEFTCTRL) + input_add_keycode(input, KEY_LEFTCTRL, + old & HID_MOD_LEFTCTRL); + if ((new ^ old) & HID_MOD_RIGHTCTRL) + input_add_keycode(input, KEY_RIGHTCTRL, + old & HID_MOD_RIGHTCTRL); + if ((new ^ old) & HID_MOD_LEFTSHIFT) + input_add_keycode(input, KEY_LEFTSHIFT, + old & HID_MOD_LEFTSHIFT); + if ((new ^ old) & HID_MOD_RIGHTSHIFT) + input_add_keycode(input, KEY_RIGHTSHIFT, + old & HID_MOD_RIGHTSHIFT); + if ((new ^ old) & HID_MOD_LEFTALT) + input_add_keycode(input, KEY_LEFTALT, + old & HID_MOD_LEFTALT); + if ((new ^ old) & HID_MOD_RIGHTALT) + input_add_keycode(input, KEY_RIGHTALT, + old & HID_MOD_RIGHTALT); + if ((new ^ old) & HID_MOD_LEFTGUI) + input_add_keycode(input, KEY_LEFTMETA, + old & HID_MOD_LEFTGUI); + if ((new ^ old) & HID_MOD_RIGHTGUI) + input_add_keycode(input, KEY_RIGHTMETA, + old & HID_MOD_RIGHTGUI); +} + +static void apple_spi_kbd_service_key(struct input_config *input, int i, + int released) +{ + struct apple_spi_kbd_priv *priv = dev_get_priv(input->dev); + u8 *new; + u8 *old; + + if (released) { + new = priv->new.keycode; + old = priv->old.keycode; + } else { + new = priv->old.keycode; + old = priv->new.keycode; + } + + if (memscan(new, old[i], sizeof(priv->new.keycode)) == + new + sizeof(priv->new.keycode) && + old[i] < ARRAY_SIZE(hid_kbd_keymap)) + input_add_keycode(input, hid_kbd_keymap[old[i]], released); +} + +static int apple_spi_kbd_check(struct input_config *input) +{ + struct udevice *dev = input->dev; + struct apple_spi_kbd_priv *priv = dev_get_priv(dev); + struct apple_spi_kbd_packet packet; + struct apple_spi_kbd_msg *msg; + struct apple_spi_kbd_report *report; + int i, ret; + + memset(&packet, 0, sizeof(packet)); + + ret = dm_spi_claim_bus(dev); + if (ret < 0) + return ret; + + /* + * The keyboard controller needs delays after asserting CS# + * and before deasserting CS#. + */ + ret = dm_spi_xfer(dev, 0, NULL, NULL, SPI_XFER_BEGIN); + if (ret < 0) + goto fail; + udelay(100); + ret = dm_spi_xfer(dev, sizeof(packet) * 8, NULL, &packet, 0); + if (ret < 0) + goto fail; + udelay(100); + ret = dm_spi_xfer(dev, 0, NULL, NULL, SPI_XFER_END); + if (ret < 0) + goto fail; + + dm_spi_release_bus(dev); + + /* + * The keyboard controller needs a delay between subsequent + * SPI transfers. + */ + udelay(250); + + msg = (struct apple_spi_kbd_msg *)packet.data; + report = (struct apple_spi_kbd_report *)msg->data; + if (packet.flags == PACKET_READ && packet.device == KBD_DEVICE && + msg->type == MSG_REPORT && msg->device == KBD_DEVICE && + msg->cmdlen == sizeof(struct apple_spi_kbd_report) && + report->reportid == KBD_REPORTID) { + memcpy(&priv->new, report, + sizeof(struct apple_spi_kbd_report)); + apple_spi_kbd_service_modifiers(input); + for (i = 0; i < sizeof(priv->new.keycode); i++) { + apple_spi_kbd_service_key(input, i, 1); + apple_spi_kbd_service_key(input, i, 0); + } + memcpy(&priv->old, &priv->new, + sizeof(struct apple_spi_kbd_report)); + return 1; + } + + return 0; + +fail: + /* + * Make sure CS# is deasserted. If this fails there is nothing + * we can do, so ignore any errors. + */ + dm_spi_xfer(dev, 0, NULL, NULL, SPI_XFER_END); + dm_spi_release_bus(dev); + return ret; +} + +static int apple_spi_kbd_probe(struct udevice *dev) +{ + struct apple_spi_kbd_priv *priv = dev_get_priv(dev); + struct keyboard_priv *uc_priv = dev_get_uclass_priv(dev); + struct stdio_dev *sdev = &uc_priv->sdev; + struct input_config *input = &uc_priv->input; + int ret; + + ret = gpio_request_by_name(dev, "spien-gpios", 0, &priv->enable, + GPIOD_IS_OUT); + if (ret < 0) + return ret; + + /* Reset the keyboard controller. */ + dm_gpio_set_value(&priv->enable, 1); + udelay(5000); + dm_gpio_set_value(&priv->enable, 0); + udelay(5000); + + /* Enable the keyboard controller. */ + dm_gpio_set_value(&priv->enable, 1); + + input->dev = dev; + input->read_keys = apple_spi_kbd_check; + input_add_tables(input, false); + strcpy(sdev->name, "spikbd"); + + return input_stdio_register(sdev); +} + +static const struct keyboard_ops apple_spi_kbd_ops = { +}; + +static const struct udevice_id apple_spi_kbd_of_match[] = { + { .compatible = "apple,spi-hid-transport" }, + { /* sentinel */ } +}; + +U_BOOT_DRIVER(apple_spi_kbd) = { + .name = "apple_spi_kbd", + .id = UCLASS_KEYBOARD, + .of_match = apple_spi_kbd_of_match, + .probe = apple_spi_kbd_probe, + .priv_auto = sizeof(struct apple_spi_kbd_priv), + .ops = &apple_spi_kbd_ops, +}; diff --git a/include/configs/apple.h b/include/configs/apple.h index 47faad8150..f12e9bdef5 100644 --- a/include/configs/apple.h +++ b/include/configs/apple.h @@ -5,7 +5,7 @@

/* Environment */ #define ENV_DEVICE_SETTINGS \ - "stdin=serial,usbkbd\0" \ + "stdin=serial,usbkbd,spikbd\0" \ "stdout=serial,vidconsole\0" \ "stderr=serial,vidconsole\0"