1// SPDX-License-Identifier: GPL-2.0
  2
  3/* Copyright (c) 2012-2018, The Linux Foundation. All rights reserved.
  4 * Copyright (C) 2019-2022 Linaro Ltd.
  5 */
  6
  7#include <linux/io.h>
  8
  9#include "ipa.h"
 10#include "ipa_reg.h"
 11
 12/* Is this register valid and defined for the current IPA version? */
 13static bool ipa_reg_valid(struct ipa *ipa, enum ipa_reg_id reg_id)
 14{
 15	enum ipa_version version = ipa->version;
 16	bool valid;
 17
 18	/* Check for bogus (out of range) register IDs */
 19	if ((u32)reg_id >= ipa->regs->reg_count)
 20		return false;
 21
 22	switch (reg_id) {
 23	case IPA_BCR:
 24	case COUNTER_CFG:
 25		valid = version < IPA_VERSION_4_5;
 26		break;
 27
 28	case IPA_TX_CFG:
 29	case FLAVOR_0:
 30	case IDLE_INDICATION_CFG:
 31		valid = version >= IPA_VERSION_3_5;
 32		break;
 33
 34	case QTIME_TIMESTAMP_CFG:
 35	case TIMERS_XO_CLK_DIV_CFG:
 36	case TIMERS_PULSE_GRAN_CFG:
 37		valid = version >= IPA_VERSION_4_5;
 38		break;
 39
 40	case SRC_RSRC_GRP_45_RSRC_TYPE:
 41	case DST_RSRC_GRP_45_RSRC_TYPE:
 42		valid = version <= IPA_VERSION_3_1 ||
 43			version == IPA_VERSION_4_5;
 44		break;
 45
 46	case SRC_RSRC_GRP_67_RSRC_TYPE:
 47	case DST_RSRC_GRP_67_RSRC_TYPE:
 48		valid = version <= IPA_VERSION_3_1;
 49		break;
 50
 51	case ENDP_FILTER_ROUTER_HSH_CFG:
 52		valid = version != IPA_VERSION_4_2;
 53		break;
 54
 55	case IRQ_SUSPEND_EN:
 56	case IRQ_SUSPEND_CLR:
 57		valid = version >= IPA_VERSION_3_1;
 58		break;
 59
 60	default:
 61		valid = true;	/* Others should be defined for all versions */
 62		break;
 63	}
 64
 65	/* To be valid, it must be defined */
 66
 67	return valid && ipa->regs->reg[reg_id];
 68}
 69
 70const struct ipa_reg *ipa_reg(struct ipa *ipa, enum ipa_reg_id reg_id)
 71{
 72	if (WARN_ON(!ipa_reg_valid(ipa, reg_id)))
 73		return NULL;
 74
 75	return ipa->regs->reg[reg_id];
 76}
 77
 78static const struct ipa_regs *ipa_regs(enum ipa_version version)
 79{
 80	switch (version) {
 81	case IPA_VERSION_3_1:
 82		return &ipa_regs_v3_1;
 83	case IPA_VERSION_3_5_1:
 84		return &ipa_regs_v3_5_1;
 85	case IPA_VERSION_4_2:
 86		return &ipa_regs_v4_2;
 87	case IPA_VERSION_4_5:
 88		return &ipa_regs_v4_5;
 89	case IPA_VERSION_4_7:
 90		return &ipa_regs_v4_7;
 91	case IPA_VERSION_4_9:
 92		return &ipa_regs_v4_9;
 93	case IPA_VERSION_4_11:
 94		return &ipa_regs_v4_11;
 95	default:
 96		return NULL;
 97	}
 98}
 99
100int ipa_reg_init(struct ipa *ipa)
101{
102	struct device *dev = &ipa->pdev->dev;
103	const struct ipa_regs *regs;
104	struct resource *res;
105
106	regs = ipa_regs(ipa->version);
107	if (!regs)
108		return -EINVAL;
109
110	if (WARN_ON(regs->reg_count > IPA_REG_ID_COUNT))
111		return -EINVAL;
112
113	/* Setup IPA register memory  */
114	res = platform_get_resource_byname(ipa->pdev, IORESOURCE_MEM,
115					   "ipa-reg");
116	if (!res) {
117		dev_err(dev, "DT error getting \"ipa-reg\" memory property\n");
118		return -ENODEV;
119	}
120
121	ipa->reg_virt = ioremap(res->start, resource_size(res));
122	if (!ipa->reg_virt) {
123		dev_err(dev, "unable to remap \"ipa-reg\" memory\n");
124		return -ENOMEM;
125	}
126	ipa->reg_addr = res->start;
127	ipa->regs = regs;
128
129	return 0;
130}
131
132void ipa_reg_exit(struct ipa *ipa)
133{
134	iounmap(ipa->reg_virt);
135}