whiskers: enable ST touchpad

BRANCH=whiskers
BUG=b:70482333
TEST=make BOARD=whiskers
Signed-off-by: Wei-Han Chen <stimim@chromium.org>

Change-Id: I8a5ef6796a60706da539dd80fb03a379f1aa8d38
Reviewed-on: https://chromium-review.googlesource.com/958895
Commit-Ready: Wei-Han Chen <stimim@chromium.org>
Tested-by: Wei-Han Chen <stimim@chromium.org>
Reviewed-by: Nicolas Boichat <drinkcat@chromium.org>

2 files changed, 61 insertions, 11 deletions

diff --git a/board/hammer/board.c b/board/hammer/board.c
index a7ccbf5e87..54c5305eb9 100644
--- a/board/hammer/board.c
+++ b/board/hammer/board.c
@@ -4,6 +4,7 @@
  */
 /* Hammer board configuration */
 
+#include "clock.h"
 #include "common.h"
 #include "driver/led/lm3630a.h"
 #include "ec_version.h"
@@ -22,6 +23,7 @@
 #include "queue_policies.h"
 #include "registers.h"
 #include "rollback.h"
+#include "spi.h"
 #include "system.h"
 #include "task.h"
 #include "touchpad.h"
@@ -33,6 +35,7 @@
 #include "usb_api.h"
 #include "usb_descriptor.h"
 #include "usb_i2c.h"
+#include "usb_spi.h"
 #include "util.h"
 
 #include "gpio_list.h"
@@ -66,6 +69,18 @@ BUILD_ASSERT(ARRAY_SIZE(usb_strings) == USB_STR_COUNT);
  */
 
 #ifdef SECTION_IS_RW
+#ifdef BOARD_WHISKERS
+/* SPI devices */
+const struct spi_device_t spi_devices[] = {
+	[SPI_ST_TP_DEVICE_ID] = { CONFIG_SPI_TOUCHPAD_PORT, 2, GPIO_SPI1_NSS },
+};
+const unsigned int spi_devices_used = ARRAY_SIZE(spi_devices);
+
+USB_SPI_CONFIG(usb_spi, USB_IFACE_I2C_SPI, USB_EP_I2C_SPI);
+/* SPI interface is always enabled, no need to do anything. */
+void usb_spi_board_enable(struct usb_spi_config const *config) {}
+void usb_spi_board_disable(struct usb_spi_config const *config) {}
+#endif  /* !BOARD_WHISKERS */
 
 /* I2C ports */
 const struct i2c_port_t i2c_ports[] = {
@@ -177,6 +192,26 @@ static void board_init(void)
 
 #ifdef BOARD_WHISKERS
 	lm3630a_poweron();
+	spi_enable(CONFIG_SPI_TOUCHPAD_PORT, 0);
+
+	/* Disable SPI passthrough when the system is locked */
+	usb_spi_enable(&usb_spi, system_is_locked());
+
+	/* Set all four SPI pins to high speed */
+	/* pins B3/5, A15 */
+	STM32_GPIO_OSPEEDR(GPIO_B) |= 0x00000cc0;
+	STM32_GPIO_OSPEEDR(GPIO_A) |= 0xc0000000;
+
+	/* Reset SPI1 */
+	STM32_RCC_APB2RSTR |= STM32_RCC_PB2_SPI1;
+	STM32_RCC_APB2RSTR &= ~STM32_RCC_PB2_SPI1;
+	/* Enable clocks to SPI1 module */
+	STM32_RCC_APB2ENR |= STM32_RCC_PB2_SPI1;
+
+	clock_wait_bus_cycles(BUS_APB, 1);
+	/* Enable SPI for touchpad */
+	gpio_config_module(MODULE_SPI_MASTER, 1);
+	spi_enable(CONFIG_SPI_TOUCHPAD_PORT, 1);
 #endif /* BOARD_WHISKERS */
 #endif /* SECTION_IS_RW */
 }
@@ -231,9 +266,9 @@ void board_touchpad_reset(void)
 {
 #ifdef BOARD_WHISKERS
 	gpio_set_level(GPIO_EN_PP3300_TP, 0);
-	msleep(10);
+	msleep(100);
 	gpio_set_level(GPIO_EN_PP3300_TP, 1);
-	msleep(10);
+	msleep(100);
 #else
 	gpio_set_level(GPIO_EN_PP3300_TP_ODL, 1);
 	msleep(10);
diff --git a/board/hammer/board.h b/board/hammer/board.h
index b299201cd0..910e951d11 100644
--- a/board/hammer/board.h
+++ b/board/hammer/board.h
@@ -114,7 +114,8 @@
 #define USB_IFACE_HID_KEYBOARD	0
 #define USB_IFACE_UPDATE	1
 #define USB_IFACE_HID_TOUCHPAD	2
-#define USB_IFACE_I2C		3
+/* Can be either I2C or SPI passthrough, depending on the board. */
+#define USB_IFACE_I2C_SPI	3
 #define USB_IFACE_COUNT		4
 #else
 #define USB_IFACE_UPDATE	0
@@ -127,7 +128,8 @@
 #ifdef SECTION_IS_RW
 #define USB_EP_HID_KEYBOARD	2
 #define USB_EP_HID_TOUCHPAD	3
-#define USB_EP_I2C		4
+/* Can be either I2C or SPI passthrough, depending on the board. */
+#define USB_EP_I2C_SPI		4
 #define USB_EP_COUNT		5
 #else
 #define USB_EP_COUNT		2
@@ -180,12 +182,11 @@
 #define CONFIG_USB_HID_TOUCHPAD_PHYSICAL_MAX_Y 581 /* tenth of mm */
 #define CONFIG_TOUCHPAD_VIRTUAL_SIZE (56*1024)
 #elif defined(BOARD_WHISKERS)
-/* TODO(b:68934906): Add support for touchpad and replace these values. */
-#define CONFIG_USB_HID_TOUCHPAD_LOGICAL_MAX_X 3000
-#define CONFIG_USB_HID_TOUCHPAD_LOGICAL_MAX_Y 1500
+#define CONFIG_USB_HID_TOUCHPAD_LOGICAL_MAX_X 2160
+#define CONFIG_USB_HID_TOUCHPAD_LOGICAL_MAX_Y 1080
 #define CONFIG_USB_HID_TOUCHPAD_PHYSICAL_MAX_X 1000 /* tenth of mm */
 #define CONFIG_USB_HID_TOUCHPAD_PHYSICAL_MAX_Y 500 /* tenth of mm */
-#define CONFIG_TOUCHPAD_VIRTUAL_SIZE (48*1024)
+#define CONFIG_TOUCHPAD_VIRTUAL_SIZE (128*1024)
 #else
 #error "No touchpad information for board."
 #endif
@@ -200,8 +201,6 @@
 /* Keyboard output port list */
 #define KB_OUT_PORT_LIST GPIO_A, GPIO_B, GPIO_C, GPIO_F
 
-/* Enable control of I2C over USB */
-#define CONFIG_USB_I2C
 #define CONFIG_I2C
 #define CONFIG_I2C_MASTER
 #define I2C_PORT_MASTER 0
@@ -215,13 +214,29 @@
 #define CONFIG_LED_DRIVER_LM3630A
 #define CONFIG_LID_SWITCH
 #define CONFIG_USB_INHIBIT_CONNECT
-#endif
+/* Enable control of SPI over USB */
+#define CONFIG_USB_SPI
+#define CONFIG_SPI_MASTER
+#define CONFIG_SPI_HALFDUPLEX
+#define CONFIG_STM32_SPI1_MASTER
+#define CONFIG_SPI_TOUCHPAD_PORT 0
+#define SPI_ST_TP_DEVICE_ID 0
+/* Enable SPI master xfer command */
+#define CONFIG_CMD_SPI_XFER
+#define CONFIG_TOUCHPAD
+#define CONFIG_TOUCHPAD_ST
 
+#else  /* !BOARD_WHISKERS */
+/* Enable control of I2C over USB */
+#define CONFIG_USB_I2C
+#define USB_IFACE_I2C USB_IFACE_I2C_SPI
+#define USB_EP_I2C USB_EP_I2C_SPI
 /* Enable Elan touchpad driver */
 #define CONFIG_TOUCHPAD
 #define CONFIG_TOUCHPAD_ELAN
 #define CONFIG_TOUCHPAD_I2C_PORT I2C_PORT_MASTER
 #define CONFIG_TOUCHPAD_I2C_ADDR (0x15 << 1)
+#endif  /* BOARD_WHISKERS */
 
 #define CONFIG_CURVE25519