1 /*
2 * Copyright (c) 2017-2022, Arm Limited and Contributors. All rights reserved.
3 * Copyright (c) 2020, NVIDIA Corporation. All rights reserved.
4 *
5 * SPDX-License-Identifier: BSD-3-Clause
6 */
7
8 /*
9 * Driver for GIC-500 and GIC-600 specific features. This driver only
10 * overrides APIs that are different to those generic ones in GICv3
11 * driver.
12 *
13 * GIC-600 supports independently power-gating redistributor interface.
14 */
15
16 #include <assert.h>
17
18 #include <arch_helpers.h>
19 #include <common/debug.h>
20 #include <drivers/arm/arm_gicv3_common.h>
21 #include <drivers/arm/gicv3.h>
22
23 #include "gicv3_private.h"
24
25 /* GIC-600 specific register offsets */
26 #define GICR_PWRR 0x24U
27
28 /* GICR_PWRR fields */
29 #define PWRR_RDPD_SHIFT 0
30 #define PWRR_RDAG_SHIFT 1
31 #define PWRR_RDGPD_SHIFT 2
32 #define PWRR_RDGPO_SHIFT 3
33
34 #define PWRR_RDPD (1U << PWRR_RDPD_SHIFT)
35 #define PWRR_RDAG (1U << PWRR_RDAG_SHIFT)
36 #define PWRR_RDGPD (1U << PWRR_RDGPD_SHIFT)
37 #define PWRR_RDGPO (1U << PWRR_RDGPO_SHIFT)
38
39 /*
40 * Values to write to GICR_PWRR register to power redistributor
41 * for operating through the core (GICR_PWRR.RDAG = 0)
42 */
43 #define PWRR_ON (0U << PWRR_RDPD_SHIFT)
44 #define PWRR_OFF (1U << PWRR_RDPD_SHIFT)
45
46 static bool gic600_errata_wa_2384374 __unused;
47
48 #if GICV3_SUPPORT_GIC600
49
50 /* GIC-600/700 specific accessor functions */
gicr_write_pwrr(uintptr_t base,unsigned int val)51 static void gicr_write_pwrr(uintptr_t base, unsigned int val)
52 {
53 mmio_write_32(base + GICR_PWRR, val);
54 }
55
gicr_read_pwrr(uintptr_t base)56 static uint32_t gicr_read_pwrr(uintptr_t base)
57 {
58 return mmio_read_32(base + GICR_PWRR);
59 }
60
gicr_wait_group_not_in_transit(uintptr_t base)61 static void gicr_wait_group_not_in_transit(uintptr_t base)
62 {
63 uint32_t pwrr;
64
65 do {
66 pwrr = gicr_read_pwrr(base);
67
68 /* Check group not transitioning: RDGPD == RDGPO */
69 } while (((pwrr & PWRR_RDGPD) >> PWRR_RDGPD_SHIFT) !=
70 ((pwrr & PWRR_RDGPO) >> PWRR_RDGPO_SHIFT));
71 }
72
gic600_pwr_on(uintptr_t base)73 static void gic600_pwr_on(uintptr_t base)
74 {
75 do { /* Wait until group not transitioning */
76 gicr_wait_group_not_in_transit(base);
77
78 /* Power on redistributor */
79 gicr_write_pwrr(base, PWRR_ON);
80
81 /*
82 * Wait until the power on state is reflected.
83 * If RDPD == 0 then powered on.
84 */
85 } while ((gicr_read_pwrr(base) & PWRR_RDPD) != PWRR_ON);
86 }
87
gic600_pwr_off(uintptr_t base)88 static void gic600_pwr_off(uintptr_t base)
89 {
90 /* Wait until group not transitioning */
91 gicr_wait_group_not_in_transit(base);
92
93 /* Power off redistributor */
94 gicr_write_pwrr(base, PWRR_OFF);
95
96 /*
97 * If this is the last man, turning this redistributor frame off will
98 * result in the group itself being powered off and RDGPD = 1.
99 * In that case, wait as long as it's in transition, or has aborted
100 * the transition altogether for any reason.
101 */
102 if ((gicr_read_pwrr(base) & PWRR_RDGPD) != 0U) {
103 /* Wait until group not transitioning */
104 gicr_wait_group_not_in_transit(base);
105 }
106 }
107
get_gicr_base(unsigned int proc_num)108 static uintptr_t get_gicr_base(unsigned int proc_num)
109 {
110 uintptr_t gicr_base;
111
112 assert(gicv3_driver_data != NULL);
113 assert(proc_num < gicv3_driver_data->rdistif_num);
114 assert(gicv3_driver_data->rdistif_base_addrs != NULL);
115
116 gicr_base = gicv3_driver_data->rdistif_base_addrs[proc_num];
117 assert(gicr_base != 0UL);
118
119 return gicr_base;
120 }
121
gicv3_redists_need_power_mgmt(uintptr_t gicr_base)122 static bool gicv3_redists_need_power_mgmt(uintptr_t gicr_base)
123 {
124 uint32_t reg = mmio_read_32(gicr_base + GICR_IIDR);
125
126 /*
127 * The Arm GIC-600 and GIC-700 models have their redistributors
128 * powered down at reset.
129 */
130 return (((reg & IIDR_MODEL_MASK) == IIDR_MODEL_ARM_GIC_600) ||
131 ((reg & IIDR_MODEL_MASK) == IIDR_MODEL_ARM_GIC_600AE) ||
132 ((reg & IIDR_MODEL_MASK) == IIDR_MODEL_ARM_GIC_700));
133 }
134
135 #endif /* GICV3_SUPPORT_GIC600 */
136
gicv3_distif_pre_save(unsigned int proc_num)137 void gicv3_distif_pre_save(unsigned int proc_num)
138 {
139 arm_gicv3_distif_pre_save(proc_num);
140 }
141
gicv3_distif_post_restore(unsigned int proc_num)142 void gicv3_distif_post_restore(unsigned int proc_num)
143 {
144 arm_gicv3_distif_post_restore(proc_num);
145 }
146
147 /*
148 * Power off GIC-600 redistributor (if configured and detected)
149 */
gicv3_rdistif_off(unsigned int proc_num)150 void gicv3_rdistif_off(unsigned int proc_num)
151 {
152 #if GICV3_SUPPORT_GIC600
153 uintptr_t gicr_base = get_gicr_base(proc_num);
154
155 /* Attempt to power redistributor off */
156 if (gicv3_redists_need_power_mgmt(gicr_base)) {
157 gic600_pwr_off(gicr_base);
158 }
159 #endif
160 }
161
162 /*
163 * Power on GIC-600 redistributor (if configured and detected)
164 */
gicv3_rdistif_on(unsigned int proc_num)165 void gicv3_rdistif_on(unsigned int proc_num)
166 {
167 #if GICV3_SUPPORT_GIC600
168 uintptr_t gicr_base = get_gicr_base(proc_num);
169
170 /* Power redistributor on */
171 if (gicv3_redists_need_power_mgmt(gicr_base)) {
172 gic600_pwr_on(gicr_base);
173 }
174 #endif
175 }
176
177 #if GIC600_ERRATA_WA_2384374
178 /*******************************************************************************
179 * Apply part 2 of workaround for errata-2384374 as per SDEN:
180 * https://developer.arm.com/documentation/sden892601/latest/
181 ******************************************************************************/
gicv3_apply_errata_wa_2384374(uintptr_t gicr_base)182 void gicv3_apply_errata_wa_2384374(uintptr_t gicr_base)
183 {
184 if (gic600_errata_wa_2384374) {
185 uint32_t gicr_ctlr_val = gicr_read_ctlr(gicr_base);
186
187 gicr_write_ctlr(gicr_base, gicr_ctlr_val |
188 (GICR_CTLR_DPG0_BIT | GICR_CTLR_DPG1NS_BIT |
189 GICR_CTLR_DPG1S_BIT));
190 gicr_write_ctlr(gicr_base, gicr_ctlr_val &
191 ~(GICR_CTLR_DPG0_BIT | GICR_CTLR_DPG1NS_BIT |
192 GICR_CTLR_DPG1S_BIT));
193 }
194 }
195 #endif /* GIC600_ERRATA_WA_2384374 */
196
gicv3_check_erratas_applies(uintptr_t gicd_base)197 void gicv3_check_erratas_applies(uintptr_t gicd_base)
198 {
199 unsigned int gic_prod_id;
200 uint8_t gic_rev;
201
202 assert(gicd_base != 0UL);
203
204 gicv3_get_component_prodid_rev(gicd_base, &gic_prod_id, &gic_rev);
205
206 /*
207 * This workaround applicable only to GIC600 and GIC600AE products with
208 * revision less than r1p6 and r0p2 respectively.
209 * As per GIC600/GIC600AE specification -
210 * r1p6 = 0x17 => GICD_IIDR[19:12]
211 * r0p2 = 0x04 => GICD_IIDR[19:12]
212 */
213 if ((gic_prod_id == GIC_PRODUCT_ID_GIC600) ||
214 (gic_prod_id == GIC_PRODUCT_ID_GIC600AE)) {
215 if (((gic_prod_id == GIC_PRODUCT_ID_GIC600) &&
216 (gic_rev <= GIC_REV(GIC_VARIANT_R1, GIC_REV_P6))) ||
217 ((gic_prod_id == GIC_PRODUCT_ID_GIC600AE) &&
218 (gic_rev <= GIC_REV(GIC_VARIANT_R0, GIC_REV_P2)))) {
219 #if GIC600_ERRATA_WA_2384374
220 gic600_errata_wa_2384374 = true;
221 VERBOSE("%s applies\n",
222 "GIC600/GIC600AE errata workaround 2384374");
223 #else
224 WARN("%s missing\n",
225 "GIC600/GIC600AE errata workaround 2384374");
226 #endif /* GIC600_ERRATA_WA_2384374 */
227 } else {
228 VERBOSE("%s not applies\n",
229 "GIC600/GIC600AE errata workaround 2384374");
230 }
231 }
232 }
233