215 lines
7.0 KiB
C
215 lines
7.0 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright (c) 2012-2018, The Linux Foundation. All rights reserved.
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* Copyright (C) 2018-2020 Linaro Ltd.
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*/
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#include <linux/types.h>
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#include <linux/io.h>
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#include <linux/delay.h>
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#include "ipa.h"
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#include "ipa_clock.h"
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#include "ipa_uc.h"
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/**
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* DOC: The IPA embedded microcontroller
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*
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* The IPA incorporates a microcontroller that is able to do some additional
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* handling/offloading of network activity. The current code makes
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* essentially no use of the microcontroller, but it still requires some
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* initialization. It needs to be notified in the event the AP crashes.
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*
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* The microcontroller can generate two interrupts to the AP. One interrupt
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* is used to indicate that a response to a request from the AP is available.
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* The other is used to notify the AP of the occurrence of an event. In
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* addition, the AP can interrupt the microcontroller by writing a register.
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*
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* A 128 byte block of structured memory within the IPA SRAM is used together
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* with these interrupts to implement the communication interface between the
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* AP and the IPA microcontroller. Each side writes data to the shared area
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* before interrupting its peer, which will read the written data in response
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* to the interrupt. Some information found in the shared area is currently
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* unused. All remaining space in the shared area is reserved, and must not
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* be read or written by the AP.
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*/
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/* Supports hardware interface version 0x2000 */
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/* Delay to allow a the microcontroller to save state when crashing */
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#define IPA_SEND_DELAY 100 /* microseconds */
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/**
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* struct ipa_uc_mem_area - AP/microcontroller shared memory area
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* @command: command code (AP->microcontroller)
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* @reserved0: reserved bytes; avoid reading or writing
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* @command_param: low 32 bits of command parameter (AP->microcontroller)
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* @command_param_hi: high 32 bits of command parameter (AP->microcontroller)
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*
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* @response: response code (microcontroller->AP)
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* @reserved1: reserved bytes; avoid reading or writing
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* @response_param: response parameter (microcontroller->AP)
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*
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* @event: event code (microcontroller->AP)
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* @reserved2: reserved bytes; avoid reading or writing
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* @event_param: event parameter (microcontroller->AP)
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*
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* @first_error_address: address of first error-source on SNOC
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* @hw_state: state of hardware (including error type information)
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* @warning_counter: counter of non-fatal hardware errors
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* @reserved3: reserved bytes; avoid reading or writing
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* @interface_version: hardware-reported interface version
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* @reserved4: reserved bytes; avoid reading or writing
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*
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* A shared memory area at the base of IPA resident memory is used for
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* communication with the microcontroller. The region is 128 bytes in
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* size, but only the first 40 bytes (structured this way) are used.
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*/
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struct ipa_uc_mem_area {
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u8 command; /* enum ipa_uc_command */
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u8 reserved0[3];
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__le32 command_param;
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__le32 command_param_hi;
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u8 response; /* enum ipa_uc_response */
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u8 reserved1[3];
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__le32 response_param;
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u8 event; /* enum ipa_uc_event */
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u8 reserved2[3];
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__le32 event_param;
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__le32 first_error_address;
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u8 hw_state;
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u8 warning_counter;
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__le16 reserved3;
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__le16 interface_version;
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__le16 reserved4;
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};
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/** enum ipa_uc_command - commands from the AP to the microcontroller */
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enum ipa_uc_command {
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IPA_UC_COMMAND_NO_OP = 0,
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IPA_UC_COMMAND_UPDATE_FLAGS = 1,
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IPA_UC_COMMAND_DEBUG_RUN_TEST = 2,
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IPA_UC_COMMAND_DEBUG_GET_INFO = 3,
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IPA_UC_COMMAND_ERR_FATAL = 4,
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IPA_UC_COMMAND_CLK_GATE = 5,
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IPA_UC_COMMAND_CLK_UNGATE = 6,
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IPA_UC_COMMAND_MEMCPY = 7,
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IPA_UC_COMMAND_RESET_PIPE = 8,
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IPA_UC_COMMAND_REG_WRITE = 9,
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IPA_UC_COMMAND_GSI_CH_EMPTY = 10,
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};
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/** enum ipa_uc_response - microcontroller response codes */
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enum ipa_uc_response {
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IPA_UC_RESPONSE_NO_OP = 0,
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IPA_UC_RESPONSE_INIT_COMPLETED = 1,
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IPA_UC_RESPONSE_CMD_COMPLETED = 2,
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IPA_UC_RESPONSE_DEBUG_GET_INFO = 3,
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};
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/** enum ipa_uc_event - common cpu events reported by the microcontroller */
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enum ipa_uc_event {
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IPA_UC_EVENT_NO_OP = 0,
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IPA_UC_EVENT_ERROR = 1,
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IPA_UC_EVENT_LOG_INFO = 2,
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};
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static struct ipa_uc_mem_area *ipa_uc_shared(struct ipa *ipa)
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{
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u32 offset = ipa->mem_offset + ipa->mem[IPA_MEM_UC_SHARED].offset;
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return ipa->mem_virt + offset;
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}
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/* Microcontroller event IPA interrupt handler */
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static void ipa_uc_event_handler(struct ipa *ipa, enum ipa_irq_id irq_id)
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{
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struct ipa_uc_mem_area *shared = ipa_uc_shared(ipa);
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struct device *dev = &ipa->pdev->dev;
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if (shared->event == IPA_UC_EVENT_ERROR)
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dev_err(dev, "microcontroller error event\n");
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else
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dev_err(dev, "unsupported microcontroller event %hhu\n",
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shared->event);
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}
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/* Microcontroller response IPA interrupt handler */
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static void ipa_uc_response_hdlr(struct ipa *ipa, enum ipa_irq_id irq_id)
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{
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struct ipa_uc_mem_area *shared = ipa_uc_shared(ipa);
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/* An INIT_COMPLETED response message is sent to the AP by the
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* microcontroller when it is operational. Other than this, the AP
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* should only receive responses from the microcontroller when it has
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* sent it a request message.
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*
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* We can drop the clock reference taken in ipa_uc_setup() once we
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* know the microcontroller has finished its initialization.
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*/
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switch (shared->response) {
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case IPA_UC_RESPONSE_INIT_COMPLETED:
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ipa->uc_loaded = true;
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ipa_clock_put(ipa);
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break;
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default:
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dev_warn(&ipa->pdev->dev,
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"unsupported microcontroller response %hhu\n",
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shared->response);
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break;
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}
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}
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/* ipa_uc_setup() - Set up the microcontroller */
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void ipa_uc_setup(struct ipa *ipa)
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{
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/* The microcontroller needs the IPA clock running until it has
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* completed its initialization. It signals this by sending an
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* INIT_COMPLETED response message to the AP. This could occur after
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* we have finished doing the rest of the IPA initialization, so we
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* need to take an extra "proxy" reference, and hold it until we've
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* received that signal. (This reference is dropped in
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* ipa_uc_response_hdlr(), above.)
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*/
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ipa_clock_get(ipa);
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ipa->uc_loaded = false;
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ipa_interrupt_add(ipa->interrupt, IPA_IRQ_UC_0, ipa_uc_event_handler);
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ipa_interrupt_add(ipa->interrupt, IPA_IRQ_UC_1, ipa_uc_response_hdlr);
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}
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/* Inverse of ipa_uc_setup() */
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void ipa_uc_teardown(struct ipa *ipa)
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{
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ipa_interrupt_remove(ipa->interrupt, IPA_IRQ_UC_1);
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ipa_interrupt_remove(ipa->interrupt, IPA_IRQ_UC_0);
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if (!ipa->uc_loaded)
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ipa_clock_put(ipa);
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}
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/* Send a command to the microcontroller */
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static void send_uc_command(struct ipa *ipa, u32 command, u32 command_param)
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{
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struct ipa_uc_mem_area *shared = ipa_uc_shared(ipa);
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shared->command = command;
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shared->command_param = cpu_to_le32(command_param);
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shared->command_param_hi = 0;
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shared->response = 0;
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shared->response_param = 0;
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iowrite32(1, ipa->reg_virt + IPA_REG_IRQ_UC_OFFSET);
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}
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/* Tell the microcontroller the AP is shutting down */
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void ipa_uc_panic_notifier(struct ipa *ipa)
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{
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if (!ipa->uc_loaded)
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return;
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send_uc_command(ipa, IPA_UC_COMMAND_ERR_FATAL, 0);
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/* give uc enough time to save state */
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udelay(IPA_SEND_DELAY);
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}
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