1 /*
2 * Copyright (c) 2021, Stephan Gerhold <stephan@gerhold.net>
3 *
4 * SPDX-License-Identifier: BSD-3-Clause
5 */
6
7 #include <assert.h>
8
9 #include <arch.h>
10 #include <common/debug.h>
11 #include <drivers/console.h>
12 #include <drivers/generic_delay_timer.h>
13 #include <lib/mmio.h>
14 #include <lib/xlat_tables/xlat_mmu_helpers.h>
15 #include <lib/xlat_tables/xlat_tables_v2.h>
16 #include <plat/common/platform.h>
17
18 #include "msm8916_gicv2.h"
19 #include <msm8916_mmap.h>
20 #include <platform_def.h>
21 #include <uartdm_console.h>
22
23 static const mmap_region_t msm8916_mmap[] = {
24 MAP_REGION_FLAT(PCNOC_BASE, PCNOC_SIZE,
25 MT_DEVICE | MT_RW | MT_SECURE | MT_EXECUTE_NEVER),
26 MAP_REGION_FLAT(APCS_BASE, APCS_SIZE,
27 MT_DEVICE | MT_RW | MT_SECURE | MT_EXECUTE_NEVER),
28 {},
29 };
30
31 static struct {
32 entry_point_info_t bl32;
33 entry_point_info_t bl33;
34 } image_ep_info = {
35 /* BL32 entry point */
36 SET_STATIC_PARAM_HEAD(bl32, PARAM_EP, VERSION_1,
37 entry_point_info_t, SECURE),
38 .bl32.pc = BL32_BASE,
39
40 /* BL33 entry point */
41 SET_STATIC_PARAM_HEAD(bl33, PARAM_EP, VERSION_1,
42 entry_point_info_t, NON_SECURE),
43 .bl33.pc = PRELOADED_BL33_BASE,
44 .bl33.spsr = SPSR_64(MODE_EL2, MODE_SP_ELX, DISABLE_ALL_EXCEPTIONS),
45 };
46
47 static console_t console;
48
plat_get_syscnt_freq2(void)49 unsigned int plat_get_syscnt_freq2(void)
50 {
51 return PLAT_SYSCNT_FREQ;
52 }
53
54 #define CLK_ENABLE BIT_32(0)
55 #define CLK_OFF BIT_32(31)
56
57 #define GPIO_BLSP_UART2_TX 4
58 #define GPIO_BLSP_UART2_RX 5
59 #define GPIO_CFG_FUNC_BLSP_UART2 (U(0x2) << 2)
60 #define GPIO_CFG_DRV_STRENGTH_16MA (U(0x7) << 6)
61
62 #define GCC_BLSP1_AHB_CBCR (GCC_BASE + 0x01008)
63 #define GCC_BLSP1_UART2_APPS_CBCR (GCC_BASE + 0x0302c)
64 #define GCC_APCS_CLOCK_BRANCH_ENA_VOTE (GCC_BASE + 0x45004)
65 #define BLSP1_AHB_CLK_ENA BIT_32(10)
66
67 /*
68 * The previous boot stage seems to disable most of the UART setup before exit
69 * so it must be enabled here again before the UART console can be used.
70 */
msm8916_enable_blsp_uart2(void)71 static void msm8916_enable_blsp_uart2(void)
72 {
73 /* Route GPIOs to BLSP UART2 */
74 mmio_write_32(TLMM_GPIO_CFG(GPIO_BLSP_UART2_TX),
75 GPIO_CFG_FUNC_BLSP_UART2 | GPIO_CFG_DRV_STRENGTH_16MA);
76 mmio_write_32(TLMM_GPIO_CFG(GPIO_BLSP_UART2_RX),
77 GPIO_CFG_FUNC_BLSP_UART2 | GPIO_CFG_DRV_STRENGTH_16MA);
78
79 /* Enable AHB clock */
80 mmio_setbits_32(GCC_APCS_CLOCK_BRANCH_ENA_VOTE, BLSP1_AHB_CLK_ENA);
81 while (mmio_read_32(GCC_BLSP1_AHB_CBCR) & CLK_OFF)
82 ;
83
84 /* Enable BLSP UART2 clock */
85 mmio_setbits_32(GCC_BLSP1_UART2_APPS_CBCR, CLK_ENABLE);
86 while (mmio_read_32(GCC_BLSP1_UART2_APPS_CBCR) & CLK_OFF)
87 ;
88 }
89
bl31_early_platform_setup2(u_register_t arg0,u_register_t arg1,u_register_t arg2,u_register_t arg3)90 void bl31_early_platform_setup2(u_register_t arg0, u_register_t arg1,
91 u_register_t arg2, u_register_t arg3)
92 {
93 /* Initialize the debug console as early as possible */
94 msm8916_enable_blsp_uart2();
95 console_uartdm_register(&console, BLSP_UART2_BASE);
96 }
97
bl31_plat_arch_setup(void)98 void bl31_plat_arch_setup(void)
99 {
100 mmap_add_region(BL31_BASE, BL31_BASE, BL31_END - BL31_BASE,
101 MT_RW_DATA | MT_SECURE);
102 mmap_add_region(BL_CODE_BASE, BL_CODE_BASE,
103 BL_CODE_END - BL_CODE_BASE,
104 MT_CODE | MT_SECURE);
105 mmap_add_region(BL_RO_DATA_BASE, BL_RO_DATA_BASE,
106 BL_RO_DATA_END - BL_RO_DATA_BASE,
107 MT_RO_DATA | MT_SECURE);
108 mmap_add_region(BL_COHERENT_RAM_BASE, BL_COHERENT_RAM_BASE,
109 BL_COHERENT_RAM_END - BL_COHERENT_RAM_BASE,
110 MT_DEVICE | MT_RW | MT_SECURE | MT_EXECUTE_NEVER);
111
112 mmap_add(msm8916_mmap);
113 init_xlat_tables();
114 enable_mmu_el3(0);
115 }
116
msm8916_configure_timer(void)117 static void msm8916_configure_timer(void)
118 {
119 /* Set timer frequency */
120 mmio_write_32(APCS_QTMR + CNTCTLBASE_CNTFRQ, plat_get_syscnt_freq2());
121
122 /* Make frame 0 available to non-secure world */
123 mmio_write_32(APCS_QTMR + CNTNSAR, BIT_32(CNTNSAR_NS_SHIFT(0)));
124 mmio_write_32(APCS_QTMR + CNTACR_BASE(0),
125 BIT_32(CNTACR_RPCT_SHIFT) | BIT_32(CNTACR_RVCT_SHIFT) |
126 BIT_32(CNTACR_RFRQ_SHIFT) | BIT_32(CNTACR_RVOFF_SHIFT) |
127 BIT_32(CNTACR_RWVT_SHIFT) | BIT_32(CNTACR_RWPT_SHIFT));
128 }
129
130 /*
131 * The APCS register regions always start with a SECURE register that should
132 * be cleared to 0 to only allow secure access. Since BL31 handles most of
133 * the CPU power management, most of them can be cleared to secure access only.
134 */
135 #define APCS_GLB_SECURE_STS_NS BIT_32(0)
136 #define APCS_GLB_SECURE_PWR_NS BIT_32(1)
137 #define APCS_BOOT_START_ADDR_SEC (APCS_CFG + 0x04)
138 #define REMAP_EN BIT_32(0)
139 #define APCS_AA64NAA32_REG (APCS_CFG + 0x0c)
140
msm8916_configure_cpu_pm(void)141 static void msm8916_configure_cpu_pm(void)
142 {
143 unsigned int cpu;
144
145 /* Disallow non-secure access to boot remapper / TCM registers */
146 mmio_write_32(APCS_CFG, 0);
147
148 /*
149 * Disallow non-secure access to power management registers.
150 * However, allow STS and PWR since those also seem to control access
151 * to CPU frequency related registers (e.g. APCS_CMD_RCGR). If these
152 * bits are not set, CPU frequency control fails in the non-secure world.
153 */
154 mmio_write_32(APCS_GLB, APCS_GLB_SECURE_STS_NS | APCS_GLB_SECURE_PWR_NS);
155
156 /* Disallow non-secure access to L2 SAW2 */
157 mmio_write_32(APCS_L2_SAW2, 0);
158
159 /* Disallow non-secure access to CPU ACS and SAW2 */
160 for (cpu = 0; cpu < PLATFORM_CORE_COUNT; cpu++) {
161 mmio_write_32(APCS_ALIAS_ACS(cpu), 0);
162 mmio_write_32(APCS_ALIAS_SAW2(cpu), 0);
163 }
164
165 /* Make sure all further warm boots end up in BL31 and aarch64 state */
166 CASSERT((BL31_BASE & 0xffff) == 0, assert_bl31_base_64k_aligned);
167 mmio_write_32(APCS_BOOT_START_ADDR_SEC, BL31_BASE | REMAP_EN);
168 mmio_write_32(APCS_AA64NAA32_REG, 1);
169 }
170
171 /*
172 * MSM8916 has a special "interrupt aggregation logic" in the APPS SMMU,
173 * which allows routing context bank interrupts to one of 3 interrupt numbers
174 * ("TZ/HYP/NS"). Route all interrupts to the non-secure interrupt number
175 * by default to avoid special setup on the non-secure side.
176 */
177 #define GCC_SMMU_CFG_CBCR (GCC_BASE + 0x12038)
178 #define GCC_APCS_SMMU_CLOCK_BRANCH_ENA_VOTE (GCC_BASE + 0x4500c)
179 #define SMMU_CFG_CLK_ENA BIT_32(12)
180 #define APPS_SMMU_INTR_SEL_NS (APPS_SMMU_QCOM + 0x2000)
181 #define APPS_SMMU_INTR_SEL_NS_EN_ALL U(0xffffffff)
182
msm8916_configure_smmu(void)183 static void msm8916_configure_smmu(void)
184 {
185 /* Enable SMMU configuration clock to enable register access */
186 mmio_setbits_32(GCC_APCS_SMMU_CLOCK_BRANCH_ENA_VOTE, SMMU_CFG_CLK_ENA);
187 while (mmio_read_32(GCC_SMMU_CFG_CBCR) & CLK_OFF)
188 ;
189
190 /* Route all context bank interrupts to non-secure interrupt */
191 mmio_write_32(APPS_SMMU_INTR_SEL_NS, APPS_SMMU_INTR_SEL_NS_EN_ALL);
192
193 /* Disable configuration clock again */
194 mmio_clrbits_32(GCC_APCS_SMMU_CLOCK_BRANCH_ENA_VOTE, SMMU_CFG_CLK_ENA);
195 }
196
bl31_platform_setup(void)197 void bl31_platform_setup(void)
198 {
199 INFO("BL31: Platform setup start\n");
200 generic_delay_timer_init();
201 msm8916_configure_timer();
202 msm8916_gicv2_init();
203 msm8916_configure_cpu_pm();
204 msm8916_configure_smmu();
205 INFO("BL31: Platform setup done\n");
206 }
207
bl31_plat_get_next_image_ep_info(uint32_t type)208 entry_point_info_t *bl31_plat_get_next_image_ep_info(uint32_t type)
209 {
210 switch (type) {
211 case SECURE:
212 return &image_ep_info.bl32;
213 case NON_SECURE:
214 return &image_ep_info.bl33;
215 default:
216 assert(sec_state_is_valid(type));
217 return NULL;
218 }
219 }
220