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https://github.com/Telecominfraproject/OpenCellular.git
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stm32-USB: USB GPIO control driver
Simple control of GPIOs over USB. Signed-off-by: Anton Staaf <robotboy@chromium.org> BRANCH=None BUG=None TEST=make buildall -j Change-Id: Ic5deccd1a70080742d5ac745b537ebecd56d7443 Reviewed-on: https://chromium-review.googlesource.com/217528 Reviewed-by: Vincent Palatin <vpalatin@chromium.org> Commit-Queue: Anton Staaf <robotboy@chromium.org> Tested-by: Anton Staaf <robotboy@chromium.org>
This commit is contained in:
Anton Staaf
committed by
chrome-internal-fetch
chrome-internal-fetch
parent
bd59d5bfb6
commit
a3ddf04ca9
@@ -39,6 +39,7 @@ chip-$(CONFIG_ADC)+=adc-$(CHIP_FAMILY).o
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chip-$(CONFIG_PWM)+=pwm.o
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chip-$(CONFIG_USB)+=usb.o usb_endpoints.o
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chip-$(CONFIG_USB_CONSOLE)+=usb_console.o
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chip-$(CONFIG_USB_GPIO)+=usb_gpio.o
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chip-$(CONFIG_USB_HID)+=usb_hid.o
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chip-$(CONFIG_USB_MS)+=usb_ms.o usb_ms_scsi.o
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chip-$(CONFIG_USB_POWER_DELIVERY)+=usb_pd_phy.o
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81
chip/stm32/usb_gpio.c
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81
chip/stm32/usb_gpio.c
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@@ -0,0 +1,81 @@
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/* Copyright (c) 2014 The Chromium OS Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "common.h"
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#include "gpio.h"
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#include "link_defs.h"
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#include "registers.h"
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#include "usb_gpio.h"
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void usb_gpio_tx(struct usb_gpio_config const *config)
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{
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size_t i;
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uint32_t mask = 1;
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uint32_t value = 0;
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for (i = 0; i < config->num_gpios; ++i, mask <<= 1)
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value |= (gpio_get_level(config->gpios[i])) ? mask : 0;
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config->tx_ram[0] = value;
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config->tx_ram[1] = value >> 16;
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btable_ep[config->endpoint].tx_count = USB_GPIO_TX_PACKET_SIZE;
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/*
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* TX packet updated, mark the packet as VALID.
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*/
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STM32_TOGGLE_EP(config->endpoint, EP_TX_MASK, EP_TX_VALID, 0);
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}
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void usb_gpio_rx(struct usb_gpio_config const *config)
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{
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size_t i;
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uint32_t mask = 1;
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uint32_t set_mask = ((uint32_t)(config->rx_ram[0]) |
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(uint32_t)(config->rx_ram[1]) << 16);
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uint32_t clear_mask = ((uint32_t)(config->rx_ram[2]) |
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(uint32_t)(config->rx_ram[3]) << 16);
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uint32_t ignore_mask = set_mask & clear_mask;
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if ((btable_ep[config->endpoint].rx_count & 0x3ff) ==
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USB_GPIO_RX_PACKET_SIZE) {
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for (i = 0; i < config->num_gpios; ++i, mask <<= 1) {
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if (ignore_mask & mask)
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;
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else if (set_mask & mask)
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gpio_set_level(config->gpios[i], 1);
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else if (clear_mask & mask)
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gpio_set_level(config->gpios[i], 0);
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}
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}
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/*
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* RX packet consumed, mark the packet as VALID.
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*/
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STM32_TOGGLE_EP(config->endpoint, EP_RX_MASK, EP_RX_VALID, 0);
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}
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void usb_gpio_reset(struct usb_gpio_config const *config)
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{
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int i = config->endpoint;
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btable_ep[i].tx_addr = usb_sram_addr(config->tx_ram);
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btable_ep[i].tx_count = USB_GPIO_TX_PACKET_SIZE;
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btable_ep[i].rx_addr = usb_sram_addr(config->rx_ram);
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btable_ep[i].rx_count = ((USB_GPIO_RX_PACKET_SIZE / 2) << 10);
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/*
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* Initialize TX buffer with zero, the first IN transaction will fill
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* this in with a valid value.
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*/
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config->tx_ram[0] = 0;
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config->tx_ram[1] = 0;
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STM32_USB_EP(i) = ((i << 0) | /* Endpoint Addr*/
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(3 << 4) | /* TX Valid */
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(0 << 9) | /* Bulk EP */
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(3 << 12)); /* RX Valid */
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}
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119
chip/stm32/usb_gpio.h
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119
chip/stm32/usb_gpio.h
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@@ -0,0 +1,119 @@
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/* Copyright (c) 2014 The Chromium OS Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#ifndef CHIP_STM32_USB_GPIO_H
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#define CHIP_STM32_USB_GPIO_H
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/* STM32 USB GPIO driver for Chrome EC */
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#include "compile_time_macros.h"
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#include "usb.h"
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/*
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* Compile time Per-USB gpio configuration stored in flash. Instances of this
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* structure are provided by the user of the USB gpio. This structure binds
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* together all information required to operate a USB gpio.
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*/
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struct usb_gpio_config {
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/*
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* Endpoint index, and pointers to the USB packet RAM buffers.
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*/
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int endpoint;
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usb_uint *rx_ram;
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usb_uint *tx_ram;
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/*
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* GPIO list
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*/
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enum gpio_signal const *gpios;
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size_t num_gpios;
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};
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#define USB_GPIO_RX_PACKET_SIZE 8
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#define USB_GPIO_TX_PACKET_SIZE 4
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/*
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* Convenience macro for defining a USB GPIO driver and its associated state.
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*
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* NAME is used to construct the names of the trampoline functions,
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* usb_gpio_state struct, and usb_gpio_config struct, the latter is just
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* called NAME.
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*
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* INTERFACE is the index of the USB interface to associate with this
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* GPIO driver.
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*
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* ENDPOINT is the index of the USB bulk endpoint used for receiving and
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* transmitting bytes.
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*/
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#define USB_GPIO_CONFIG(NAME, \
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GPIO_LIST, \
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INTERFACE, \
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ENDPOINT) \
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BUILD_ASSERT(ARRAY_SIZE(GPIO_LIST) <= 32); \
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static usb_uint CONCAT2(NAME, _ep_rx_buffer)[USB_GPIO_RX_PACKET_SIZE / 2] __usb_ram; \
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static usb_uint CONCAT2(NAME, _ep_tx_buffer)[USB_GPIO_TX_PACKET_SIZE / 2] __usb_ram; \
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struct usb_gpio_config const NAME = { \
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.endpoint = ENDPOINT, \
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.rx_ram = CONCAT2(NAME, _ep_rx_buffer), \
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.tx_ram = CONCAT2(NAME, _ep_tx_buffer), \
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.gpios = GPIO_LIST, \
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.num_gpios = ARRAY_SIZE(GPIO_LIST), \
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}; \
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const struct usb_interface_descriptor \
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USB_IFACE_DESC(INTERFACE) = { \
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.bLength = USB_DT_INTERFACE_SIZE, \
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.bDescriptorType = USB_DT_INTERFACE, \
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.bInterfaceNumber = INTERFACE, \
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.bAlternateSetting = 0, \
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.bNumEndpoints = 2, \
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.bInterfaceClass = USB_CLASS_VENDOR_SPEC, \
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.bInterfaceSubClass = 0, \
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.bInterfaceProtocol = 0, \
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.iInterface = 0, \
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}; \
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const struct usb_endpoint_descriptor \
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USB_EP_DESC(INTERFACE, 0) = { \
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.bLength = USB_DT_ENDPOINT_SIZE, \
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.bDescriptorType = USB_DT_ENDPOINT, \
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.bEndpointAddress = 0x80 | ENDPOINT, \
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.bmAttributes = 0x02 /* Bulk IN */, \
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.wMaxPacketSize = USB_GPIO_TX_PACKET_SIZE, \
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.bInterval = 10, \
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}; \
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const struct usb_endpoint_descriptor \
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USB_EP_DESC(INTERFACE, 1) = { \
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.bLength = USB_DT_ENDPOINT_SIZE, \
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.bDescriptorType = USB_DT_ENDPOINT, \
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.bEndpointAddress = ENDPOINT, \
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.bmAttributes = 0x02 /* Bulk OUT */, \
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.wMaxPacketSize = USB_GPIO_RX_PACKET_SIZE, \
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.bInterval = 0, \
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}; \
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static void CONCAT2(NAME, _ep_tx)(void) \
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{ \
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usb_gpio_tx(&NAME); \
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} \
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static void CONCAT2(NAME, _ep_rx)(void) \
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{ \
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usb_gpio_rx(&NAME); \
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} \
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static void CONCAT2(NAME, _ep_reset)(void) \
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{ \
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usb_gpio_reset(&NAME); \
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} \
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USB_DECLARE_EP(ENDPOINT, \
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CONCAT2(NAME, _ep_tx), \
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CONCAT2(NAME, _ep_rx), \
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CONCAT2(NAME, _ep_reset));
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/*
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* These functions are used by the trampoline functions defined above to
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* connect USB endpoint events with the generic USB GPIO driver.
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*/
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void usb_gpio_tx(struct usb_gpio_config const *config);
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void usb_gpio_rx(struct usb_gpio_config const *config);
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void usb_gpio_reset(struct usb_gpio_config const *config);
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#endif /* CHIP_STM32_USB_GPIO_H */
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@@ -1091,6 +1091,10 @@
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/* Select GPIO MUX for Pericom PI3USB9281 I2C USB switch */
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#undef CONFIG_USB_SWITCH_PI3USB9281_MUX_GPIO
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/*****************************************************************************/
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/* USB GPIO config */
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#undef CONFIG_USB_GPIO
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/*****************************************************************************/
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/* Support computing hash of code for verified boot */
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