1 // SPDX-License-Identifier: GPL-2.0
3 /* Copyright (c) 2012-2018, The Linux Foundation. All rights reserved.
4  * Copyright (C) 2018-2020 Linaro Ltd.
12 #include "ipa.h"
16  * DOC:  The IPA embedded microcontroller
18  * The IPA incorporates a microcontroller that is able to do some additional
28  * A 128 byte block of structured memory within the IPA SRAM is used together
30  * AP and the IPA microcontroller.  Each side writes data to the shared area
32  * to the interrupt.  Some information found in the shared area is currently
33  * unused.  All remaining space in the shared area is reserved, and must not
42  * struct ipa_uc_mem_area - AP/microcontroller shared memory area
43  * @command:		command code (AP->microcontroller)
45  * @command_param:	low 32 bits of command parameter (AP->microcontroller)
46  * @command_param_hi:	high 32 bits of command parameter (AP->microcontroller)
48  * @response:		response code (microcontroller->AP)
50  * @response_param:	response parameter (microcontroller->AP)
52  * @event:		event code (microcontroller->AP)
54  * @event_param:	event parameter (microcontroller->AP)
56  * @first_error_address: address of first error-source on SNOC
58  * @warning_counter:	counter of non-fatal hardware errors
60  * @interface_version:	hardware-reported interface version
63  * A shared memory area at the base of IPA resident memory is used for
87 /** enum ipa_uc_command - commands from the AP to the microcontroller */
102 /** enum ipa_uc_response - microcontroller response codes */
110 /** enum ipa_uc_event - common cpu events reported by the microcontroller */
117 static struct ipa_uc_mem_area *ipa_uc_shared(struct ipa *ipa)  in ipa_uc_shared()  argument
119 	const struct ipa_mem *mem = ipa_mem_find(ipa, IPA_MEM_UC_SHARED);  in ipa_uc_shared()
120 	u32 offset = ipa->mem_offset + mem->offset;  in ipa_uc_shared()
122 	return ipa->mem_virt + offset;  in ipa_uc_shared()
125 /* Microcontroller event IPA interrupt handler */
126 static void ipa_uc_event_handler(struct ipa *ipa, enum ipa_irq_id irq_id)  in ipa_uc_event_handler()  argument
128 	struct ipa_uc_mem_area *shared = ipa_uc_shared(ipa);  in ipa_uc_event_handler()  local
129 	struct device *dev = &ipa->pdev->dev;  in ipa_uc_event_handler()
131 	if (shared->event == IPA_UC_EVENT_ERROR)  in ipa_uc_event_handler()
133 	else if (shared->event != IPA_UC_EVENT_LOG_INFO)  in ipa_uc_event_handler()
135 			shared->event);  in ipa_uc_event_handler()
139 /* Microcontroller response IPA interrupt handler */
140 static void ipa_uc_response_hdlr(struct ipa *ipa, enum ipa_irq_id irq_id)  in ipa_uc_response_hdlr()  argument
142 	struct ipa_uc_mem_area *shared = ipa_uc_shared(ipa);  in ipa_uc_response_hdlr()  local
143 	struct device *dev = &ipa->pdev->dev;  in ipa_uc_response_hdlr()
153 	switch (shared->response) {  in ipa_uc_response_hdlr()
155 		if (ipa->uc_powered) {  in ipa_uc_response_hdlr()
156 			ipa->uc_loaded = true;  in ipa_uc_response_hdlr()
159 			ipa->uc_powered = false;  in ipa_uc_response_hdlr()
166 			 shared->response);  in ipa_uc_response_hdlr()
171 /* Configure the IPA microcontroller subsystem */
172 void ipa_uc_config(struct ipa *ipa)  in ipa_uc_config()  argument
174 	ipa->uc_powered = false;  in ipa_uc_config()
175 	ipa->uc_loaded = false;  in ipa_uc_config()
176 	ipa_interrupt_add(ipa->interrupt, IPA_IRQ_UC_0, ipa_uc_event_handler);  in ipa_uc_config()
177 	ipa_interrupt_add(ipa->interrupt, IPA_IRQ_UC_1, ipa_uc_response_hdlr);  in ipa_uc_config()
181 void ipa_uc_deconfig(struct ipa *ipa)  in ipa_uc_deconfig()  argument
183 	struct device *dev = &ipa->pdev->dev;  in ipa_uc_deconfig()
185 	ipa_interrupt_remove(ipa->interrupt, IPA_IRQ_UC_1);  in ipa_uc_deconfig()
186 	ipa_interrupt_remove(ipa->interrupt, IPA_IRQ_UC_0);  in ipa_uc_deconfig()
187 	if (!ipa->uc_powered)  in ipa_uc_deconfig()
195 void ipa_uc_power(struct ipa *ipa)  in ipa_uc_power()  argument
206 	dev = &ipa->pdev->dev;  in ipa_uc_power()
212 		ipa->uc_powered = true;  in ipa_uc_power()
217 static void send_uc_command(struct ipa *ipa, u32 command, u32 command_param)  in send_uc_command()  argument
219 	struct ipa_uc_mem_area *shared = ipa_uc_shared(ipa);  in send_uc_command()  local
224 	shared->command = command;  in send_uc_command()
225 	shared->command_param = cpu_to_le32(command_param);  in send_uc_command()
226 	shared->command_param_hi = 0;  in send_uc_command()
227 	shared->response = 0;  in send_uc_command()
228 	shared->response_param = 0;  in send_uc_command()
232 	offset = ipa_reg_irq_uc_offset(ipa->version);  in send_uc_command()
233 	iowrite32(val, ipa->reg_virt + offset);  in send_uc_command()
237 void ipa_uc_panic_notifier(struct ipa *ipa)  in ipa_uc_panic_notifier()  argument
239 	if (!ipa->uc_loaded)  in ipa_uc_panic_notifier()
242 	send_uc_command(ipa, IPA_UC_COMMAND_ERR_FATAL, 0);  in ipa_uc_panic_notifier()