1 // SPDX-License-Identifier: GPL-2.0
3 /* Copyright (c) 2012-2018, The Linux Foundation. All rights reserved.
4  * Copyright (C) 2018-2022 Linaro Ltd.
12 #include "ipa.h"
17  * DOC:  The IPA embedded microcontroller
19  * The IPA incorporates a microcontroller that is able to do some additional
29  * A 128 byte block of structured memory within the IPA SRAM is used together
31  * AP and the IPA microcontroller.  Each side writes data to the shared area
43  * struct ipa_uc_mem_area - AP/microcontroller shared memory area
44  * @command:		command code (AP->microcontroller)
46  * @command_param:	low 32 bits of command parameter (AP->microcontroller)
47  * @command_param_hi:	high 32 bits of command parameter (AP->microcontroller)
49  * @response:		response code (microcontroller->AP)
51  * @response_param:	response parameter (microcontroller->AP)
53  * @event:		event code (microcontroller->AP)
55  * @event_param:	event parameter (microcontroller->AP)
57  * @first_error_address: address of first error-source on SNOC
59  * @warning_counter:	counter of non-fatal hardware errors
61  * @interface_version:	hardware-reported interface version
64  * A shared memory area at the base of IPA resident memory is used for
88 /** enum ipa_uc_command - commands from the AP to the microcontroller */
103 /** enum ipa_uc_response - microcontroller response codes */
111 /** enum ipa_uc_event - common cpu events reported by the microcontroller */
118 static struct ipa_uc_mem_area *ipa_uc_shared(struct ipa *ipa)  in ipa_uc_shared()  argument
120 	const struct ipa_mem *mem = ipa_mem_find(ipa, IPA_MEM_UC_SHARED);  in ipa_uc_shared()
121 	u32 offset = ipa->mem_offset + mem->offset;  in ipa_uc_shared()
123 	return ipa->mem_virt + offset;  in ipa_uc_shared()
126 /* Microcontroller event IPA interrupt handler */
127 static void ipa_uc_event_handler(struct ipa *ipa)  in ipa_uc_event_handler()  argument
129 	struct ipa_uc_mem_area *shared = ipa_uc_shared(ipa);  in ipa_uc_event_handler()
130 	struct device *dev = &ipa->pdev->dev;  in ipa_uc_event_handler()
132 	if (shared->event == IPA_UC_EVENT_ERROR)  in ipa_uc_event_handler()
134 	else if (shared->event != IPA_UC_EVENT_LOG_INFO)  in ipa_uc_event_handler()
136 			shared->event);  in ipa_uc_event_handler()
140 /* Microcontroller response IPA interrupt handler */
141 static void ipa_uc_response_hdlr(struct ipa *ipa)  in ipa_uc_response_hdlr()  argument
143 	struct ipa_uc_mem_area *shared = ipa_uc_shared(ipa);  in ipa_uc_response_hdlr()
144 	struct device *dev = &ipa->pdev->dev;  in ipa_uc_response_hdlr()
154 	switch (shared->response) {  in ipa_uc_response_hdlr()
156 		if (ipa->uc_powered) {  in ipa_uc_response_hdlr()
157 			ipa->uc_loaded = true;  in ipa_uc_response_hdlr()
158 			ipa_power_retention(ipa, true);  in ipa_uc_response_hdlr()
161 			ipa->uc_powered = false;  in ipa_uc_response_hdlr()
168 			 shared->response);  in ipa_uc_response_hdlr()
173 void ipa_uc_interrupt_handler(struct ipa *ipa, enum ipa_irq_id irq_id)  in ipa_uc_interrupt_handler()  argument
177 		ipa_uc_event_handler(ipa);  in ipa_uc_interrupt_handler()
179 		ipa_uc_response_hdlr(ipa);  in ipa_uc_interrupt_handler()
182 /* Configure the IPA microcontroller subsystem */
183 void ipa_uc_config(struct ipa *ipa)  in ipa_uc_config()  argument
185 	ipa->uc_powered = false;  in ipa_uc_config()
186 	ipa->uc_loaded = false;  in ipa_uc_config()
187 	ipa_interrupt_enable(ipa, IPA_IRQ_UC_0);  in ipa_uc_config()
188 	ipa_interrupt_enable(ipa, IPA_IRQ_UC_1);  in ipa_uc_config()
192 void ipa_uc_deconfig(struct ipa *ipa)  in ipa_uc_deconfig()  argument
194 	struct device *dev = &ipa->pdev->dev;  in ipa_uc_deconfig()
196 	ipa_interrupt_disable(ipa, IPA_IRQ_UC_1);  in ipa_uc_deconfig()
197 	ipa_interrupt_disable(ipa, IPA_IRQ_UC_0);  in ipa_uc_deconfig()
198 	if (ipa->uc_loaded)  in ipa_uc_deconfig()
199 		ipa_power_retention(ipa, false);  in ipa_uc_deconfig()
201 	if (!ipa->uc_powered)  in ipa_uc_deconfig()
209 void ipa_uc_power(struct ipa *ipa)  in ipa_uc_power()  argument
220 	dev = &ipa->pdev->dev;  in ipa_uc_power()
226 		ipa->uc_powered = true;  in ipa_uc_power()
231 static void send_uc_command(struct ipa *ipa, u32 command, u32 command_param)  in send_uc_command()  argument
233 	struct ipa_uc_mem_area *shared = ipa_uc_shared(ipa);  in send_uc_command()
234 	const struct reg *reg;  in send_uc_command()  local
238 	shared->command = command;  in send_uc_command()
239 	shared->command_param = cpu_to_le32(command_param);  in send_uc_command()
240 	shared->command_param_hi = 0;  in send_uc_command()
241 	shared->response = 0;  in send_uc_command()
242 	shared->response_param = 0;  in send_uc_command()
245 	reg = ipa_reg(ipa, IPA_IRQ_UC);  in send_uc_command()
246 	val = reg_bit(reg, UC_INTR);  in send_uc_command()
248 	iowrite32(val, ipa->reg_virt + reg_offset(reg));  in send_uc_command()
252 void ipa_uc_panic_notifier(struct ipa *ipa)  in ipa_uc_panic_notifier()  argument
254 	if (!ipa->uc_loaded)  in ipa_uc_panic_notifier()
257 	send_uc_command(ipa, IPA_UC_COMMAND_ERR_FATAL, 0);  in ipa_uc_panic_notifier()