1 /*
2 * Copyright 2018-2022 NXP
3 *
4 * SPDX-License-Identifier: BSD-3-Clause
5 */
6
7 #include <stdbool.h>
8
9 #include <lib/mmio.h>
10 #include <platform_def.h>
11
12 #define IMX_CCM_IP_BASE (IMX_CCM_BASE + 0xa000)
13 #define DRAM_SEL_CFG (IMX_CCM_BASE + 0x9800)
14 #define CCM_IP_CLK_ROOT_GEN_TAGET(i) (IMX_CCM_IP_BASE + 0x80 * (i) + 0x00)
15 #define CCM_IP_CLK_ROOT_GEN_TAGET_SET(i) (IMX_CCM_IP_BASE + 0x80 * (i) + 0x04)
16 #define CCM_IP_CLK_ROOT_GEN_TAGET_CLR(i) (IMX_CCM_IP_BASE + 0x80 * (i) + 0x08)
17 #define PLL_FREQ_800M U(0x00ece580)
18 #define PLL_FREQ_400M U(0x00ec6984)
19 #define PLL_FREQ_167M U(0x00f5a406)
20
ddr_pll_bypass_100mts(void)21 void ddr_pll_bypass_100mts(void)
22 {
23 /* change the clock source of dram_alt_clk_root to source 2 --100MHz */
24 mmio_write_32(CCM_IP_CLK_ROOT_GEN_TAGET_CLR(0), (0x7 << 24) | (0x7 << 16));
25 mmio_write_32(CCM_IP_CLK_ROOT_GEN_TAGET_SET(0), (0x2 << 24));
26
27 /* change the clock source of dram_apb_clk_root to source 2 --40MHz/2 */
28 mmio_write_32(CCM_IP_CLK_ROOT_GEN_TAGET_CLR(1), (0x7 << 24) | (0x7 << 16));
29 mmio_write_32(CCM_IP_CLK_ROOT_GEN_TAGET_SET(1), (0x2 << 24) | (0x1 << 16));
30
31 /* configure pll bypass mode */
32 mmio_write_32(DRAM_SEL_CFG + 0x4, BIT(24));
33 }
34
ddr_pll_bypass_400mts(void)35 void ddr_pll_bypass_400mts(void)
36 {
37 /* change the clock source of dram_alt_clk_root to source 1 --400MHz */
38 mmio_write_32(CCM_IP_CLK_ROOT_GEN_TAGET_CLR(0), (0x7 << 24) | (0x7 << 16));
39 mmio_write_32(CCM_IP_CLK_ROOT_GEN_TAGET_SET(0), (0x1 << 24) | (0x1 << 16));
40
41 /* change the clock source of dram_apb_clk_root to source 3 --160MHz/2 */
42 mmio_write_32(CCM_IP_CLK_ROOT_GEN_TAGET_CLR(1), (0x7 << 24) | (0x7 << 16));
43 mmio_write_32(CCM_IP_CLK_ROOT_GEN_TAGET_SET(1), (0x3 << 24) | (0x1 << 16));
44
45 /* configure pll bypass mode */
46 mmio_write_32(DRAM_SEL_CFG + 0x4, BIT(24));
47 }
48
ddr_pll_unbypass(void)49 void ddr_pll_unbypass(void)
50 {
51 mmio_write_32(DRAM_SEL_CFG + 0x8, BIT(24));
52 mmio_write_32(CCM_IP_CLK_ROOT_GEN_TAGET_CLR(1), (0x7 << 24) | (0x7 << 16));
53 /* to source 4 --800MHz/5 */
54 mmio_write_32(CCM_IP_CLK_ROOT_GEN_TAGET_SET(1), (0x4 << 24) | (0x4 << 16));
55 }
56
57 #if defined(PLAT_imx8mq)
dram_pll_init(unsigned int drate)58 void dram_pll_init(unsigned int drate)
59 {
60 /* bypass the PLL */
61 mmio_setbits_32(HW_DRAM_PLL_CFG0, 0x30);
62
63 switch (drate) {
64 case 3200:
65 mmio_write_32(HW_DRAM_PLL_CFG2, PLL_FREQ_800M);
66 break;
67 case 1600:
68 mmio_write_32(HW_DRAM_PLL_CFG2, PLL_FREQ_400M);
69 break;
70 case 667:
71 mmio_write_32(HW_DRAM_PLL_CFG2, PLL_FREQ_167M);
72 break;
73 default:
74 break;
75 }
76
77 /* unbypass the PLL */
78 mmio_clrbits_32(HW_DRAM_PLL_CFG0, 0x30);
79 while (!(mmio_read_32(HW_DRAM_PLL_CFG0) & (1 << 31))) {
80 ;
81 }
82 }
83 #else
dram_pll_init(unsigned int drate)84 void dram_pll_init(unsigned int drate)
85 {
86 /* bypass the PLL */
87 mmio_setbits_32(DRAM_PLL_CTRL, (1 << 16));
88 mmio_clrbits_32(DRAM_PLL_CTRL, (1 << 9));
89
90 switch (drate) {
91 case 2400:
92 mmio_write_32(DRAM_PLL_CTRL + 0x4, (300 << 12) | (3 << 4) | 2);
93 break;
94 case 1600:
95 mmio_write_32(DRAM_PLL_CTRL + 0x4, (400 << 12) | (3 << 4) | 3);
96 break;
97 case 1066:
98 mmio_write_32(DRAM_PLL_CTRL + 0x4, (266 << 12) | (3 << 4) | 3);
99 break;
100 case 667:
101 mmio_write_32(DRAM_PLL_CTRL + 0x4, (334 << 12) | (3 << 4) | 4);
102 break;
103 default:
104 break;
105 }
106
107 mmio_setbits_32(DRAM_PLL_CTRL, BIT(9));
108 /* wait for PLL locked */
109 while (!(mmio_read_32(DRAM_PLL_CTRL) & BIT(31))) {
110 ;
111 }
112
113 /* unbypass the PLL */
114 mmio_clrbits_32(DRAM_PLL_CTRL, BIT(16));
115 }
116 #endif
117
118 /* change the dram clock frequency */
dram_clock_switch(unsigned int target_drate,bool bypass_mode)119 void dram_clock_switch(unsigned int target_drate, bool bypass_mode)
120 {
121 if (bypass_mode) {
122 switch (target_drate) {
123 case 400:
124 ddr_pll_bypass_400mts();
125 break;
126 case 100:
127 ddr_pll_bypass_100mts();
128 break;
129 default:
130 ddr_pll_unbypass();
131 break;
132 }
133 } else {
134 dram_pll_init(target_drate);
135 }
136 }
137