1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright 2008 Freescale Semiconductor, Inc.
4 */
5
6 #include <common.h>
7 #include <i2c.h>
8 #include <linux/delay.h>
9
10 #include <fsl_ddr_sdram.h>
11 #include <fsl_ddr_dimm_params.h>
12
fsl_ddr_board_options(memctl_options_t * popts,dimm_params_t * pdimm,unsigned int ctrl_num)13 void fsl_ddr_board_options(memctl_options_t *popts,
14 dimm_params_t *pdimm,
15 unsigned int ctrl_num)
16 {
17 /*
18 * Factors to consider for clock adjust:
19 * - number of chips on bus
20 * - position of slot
21 * - DDR1 vs. DDR2?
22 * - ???
23 *
24 * This needs to be determined on a board-by-board basis.
25 * 0110 3/4 cycle late
26 * 0111 7/8 cycle late
27 */
28 popts->clk_adjust = 7;
29
30 /*
31 * Factors to consider for CPO:
32 * - frequency
33 * - ddr1 vs. ddr2
34 */
35 popts->cpo_override = 10;
36
37 /*
38 * Factors to consider for write data delay:
39 * - number of DIMMs
40 *
41 * 1 = 1/4 clock delay
42 * 2 = 1/2 clock delay
43 * 3 = 3/4 clock delay
44 * 4 = 1 clock delay
45 * 5 = 5/4 clock delay
46 * 6 = 3/2 clock delay
47 */
48 popts->write_data_delay = 3;
49
50 /*
51 * Factors to consider for half-strength driver enable:
52 * - number of DIMMs installed
53 */
54 popts->half_strength_driver_enable = 0;
55 }
56
57 #ifdef CONFIG_SPD_EEPROM
58 /*
59 * Workaround for hardware errata. An i2c address conflict
60 * existed on earlier boards; the workaround moved the DDR
61 * SPD from 0x51 to 0x53. So we try and read 0x53 1st, and
62 * if that fails, then fall back to reading at 0x51.
63 */
get_spd(generic_spd_eeprom_t * spd,u8 i2c_address)64 void get_spd(generic_spd_eeprom_t *spd, u8 i2c_address)
65 {
66 int ret;
67
68 #ifdef ALT_SPD_EEPROM_ADDRESS
69 if (i2c_address == SPD_EEPROM_ADDRESS) {
70 ret = i2c_read(ALT_SPD_EEPROM_ADDRESS, 0, 1, (uchar *)spd,
71 sizeof(generic_spd_eeprom_t));
72 if (ret == 0)
73 return; /* Good data at 0x53 */
74 memset(spd, 0, sizeof(generic_spd_eeprom_t));
75 }
76 #endif
77 ret = i2c_read(i2c_address, 0, 1, (uchar *)spd,
78 sizeof(generic_spd_eeprom_t));
79 if (ret) {
80 printf("DDR: failed to read SPD from addr %u\n", i2c_address);
81 memset(spd, 0, sizeof(generic_spd_eeprom_t));
82 }
83 }
84
85 #else
86 /*
87 * fixed_sdram init -- doesn't use serial presence detect.
88 * Assumes 256MB DDR2 SDRAM SODIMM, without ECC, running at DDR400 speed.
89 */
fixed_sdram(void)90 phys_size_t fixed_sdram(void)
91 {
92 struct ccsr_ddr __iomem *ddr =
93 (struct ccsr_ddr __iomem *)(CONFIG_SYS_FSL_DDR_ADDR);
94
95 out_be32(&ddr->cs0_bnds, 0x0000007f);
96 out_be32(&ddr->cs1_bnds, 0x008000ff);
97 out_be32(&ddr->cs2_bnds, 0x00000000);
98 out_be32(&ddr->cs3_bnds, 0x00000000);
99
100 out_be32(&ddr->cs0_config, 0x80010101);
101 out_be32(&ddr->cs1_config, 0x80010101);
102 out_be32(&ddr->cs2_config, 0x00000000);
103 out_be32(&ddr->cs3_config, 0x00000000);
104
105 out_be32(&ddr->timing_cfg_3, 0x00000000);
106 out_be32(&ddr->timing_cfg_0, 0x00220802);
107 out_be32(&ddr->timing_cfg_1, 0x38377322);
108 out_be32(&ddr->timing_cfg_2, 0x0fa044C7);
109
110 out_be32(&ddr->sdram_cfg, 0x4300C000);
111 out_be32(&ddr->sdram_cfg_2, 0x24401000);
112
113 out_be32(&ddr->sdram_mode, 0x23C00542);
114 out_be32(&ddr->sdram_mode_2, 0x00000000);
115
116 out_be32(&ddr->sdram_interval, 0x05080100);
117 out_be32(&ddr->sdram_md_cntl, 0x00000000);
118 out_be32(&ddr->sdram_data_init, 0x00000000);
119 out_be32(&ddr->sdram_clk_cntl, 0x03800000);
120 asm("sync;isync;msync");
121 udelay(500);
122
123 #ifdef CONFIG_DDR_ECC
124 /* Enable ECC checking */
125 out_be32(&ddr->sdram_cfg, CONFIG_SYS_DDR_CONTROL | 0x20000000);
126 #else
127 out_be32(&ddr->sdram_cfg, CONFIG_SYS_DDR_CONTROL);
128 #endif
129
130 return CONFIG_SYS_SDRAM_SIZE * 1024 * 1024;
131 }
132 #endif
133