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gerrit.devboardsforandroid.linaro.org / platform / external / u-boot / b9e745bbe2562fda710d668dc9cef46e0b23049f / . / drivers / ddr / fsl / fsl_mmdc.c
blob: 1e359674da15bf1e9be17e15a34472a73c3b43c9 [file] [log] [blame]
Shengzhou Liub9e745b2016-08-26 18:30:39 +0800[diff] [blame^]1/*
2 * Copyright 2016 Freescale Semiconductor, Inc.
3 *
4 * SPDX-License-Identifier: GPL-2.0+
5 */
6
7/*
8 * Generic driver for Freescale MMDC(Multi Mode DDR Controller).
9 */
10
11#include <common.h>
12#include <fsl_mmdc.h>
13#include <asm/io.h>
14
15static void set_wait_for_bits_clear(void *ptr, u32 value, u32 bits)
16{
17 int timeout = 1000;
18
19 out_be32(ptr, value);
20
21 while (in_be32(ptr) & bits) {
22 udelay(100);
23 timeout--;
24 }
25 if (timeout <= 0)
26 printf("Error: %p wait for clear timeout.\n", ptr);
27}
28
29void mmdc_init(void)
30{
31 struct mmdc_regs *mmdc = (struct mmdc_regs *)CONFIG_SYS_FSL_DDR_ADDR;
32 unsigned int tmp;
33
34 /* 1. set configuration request */
35 out_be32(&mmdc->mdscr, MDSCR_ENABLE_CON_REQ);
36
37 /* 2. configure the desired timing parameters */
38 out_be32(&mmdc->mdotc, CONFIG_MMDC_MDOTC);
39 out_be32(&mmdc->mdcfg0, CONFIG_MMDC_MDCFG0);
40 out_be32(&mmdc->mdcfg1, CONFIG_MMDC_MDCFG1);
41 out_be32(&mmdc->mdcfg2, CONFIG_MMDC_MDCFG2);
42
43 /* 3. configure DDR type and other miscellaneous parameters */
44 out_be32(&mmdc->mdmisc, CONFIG_MMDC_MDMISC);
45 out_be32(&mmdc->mpmur0, MMDC_MPMUR0_FRC_MSR);
46 out_be32(&mmdc->mdrwd, CONFIG_MMDC_MDRWD);
47 out_be32(&mmdc->mpodtctrl, CONFIG_MMDC_MPODTCTRL);
48
49 /* 4. configure the required delay while leaving reset */
50 out_be32(&mmdc->mdor, CONFIG_MMDC_MDOR);
51
52 /* 5. configure DDR physical parameters */
53 /* set row/column address width, burst length, data bus width */
54 tmp = CONFIG_MMDC_MDCTL & ~(MDCTL_SDE0 | MDCTL_SDE1);
55 out_be32(&mmdc->mdctl, tmp);
56 /* configure address space partition */
57 out_be32(&mmdc->mdasp, CONFIG_MMDC_MDASP);
58
59 /* 6. perform a ZQ calibration - not needed here, doing in #8b */
60
61 /* 7. enable MMDC with the desired chip select */
62#if (CONFIG_CHIP_SELECTS_PER_CTRL == 1)
63 out_be32(&mmdc->mdctl, tmp | MDCTL_SDE0);
64#elif (CONFIG_CHIP_SELECTS_PER_CTRL == 2)
65 out_be32(&mmdc->mdctl, tmp | MDCTL_SDE0 | MDCTL_SDE1);
66#endif
67
68 /* 8a. dram init sequence: update MRs for ZQ, ODT, PRE, etc */
69 out_be32(&mmdc->mdscr, CMD_ADDR_LSB_MR_ADDR(8) | MDSCR_ENABLE_CON_REQ |
70 CMD_LOAD_MODE_REG | CMD_BANK_ADDR_2);
71
72 out_be32(&mmdc->mdscr, CMD_ADDR_LSB_MR_ADDR(0) | MDSCR_ENABLE_CON_REQ |
73 CMD_LOAD_MODE_REG | CMD_BANK_ADDR_3);
74
75 out_be32(&mmdc->mdscr, CMD_ADDR_LSB_MR_ADDR(4) | MDSCR_ENABLE_CON_REQ |
76 CMD_LOAD_MODE_REG | CMD_BANK_ADDR_1);
77
78 out_be32(&mmdc->mdscr, CMD_ADDR_MSB_MR_OP(0x19) |
79 CMD_ADDR_LSB_MR_ADDR(0x30) |
80 MDSCR_ENABLE_CON_REQ |
81 CMD_LOAD_MODE_REG | CMD_BANK_ADDR_0);
82
83 /* 8b. ZQ calibration */
84 out_be32(&mmdc->mdscr, CMD_ADDR_MSB_MR_OP(0x4) | MDSCR_ENABLE_CON_REQ |
85 CMD_ZQ_CALIBRATION | CMD_BANK_ADDR_0);
86
87 set_wait_for_bits_clear(&mmdc->mpzqhwctrl, CONFIG_MMDC_MPZQHWCTRL,
88 MPZQHWCTRL_ZQ_HW_FORCE);
89
90 /* 9a. calibrations now, wr lvl */
91 out_be32(&mmdc->mdscr, CMD_ADDR_LSB_MR_ADDR(0x84) |
92 MDSCR_ENABLE_CON_REQ |
93 CMD_LOAD_MODE_REG | CMD_BANK_ADDR_1);
94
95 out_be32(&mmdc->mdscr, MDSCR_ENABLE_CON_REQ | MDSCR_WL_EN |
96 CMD_NORMAL);
97
98 set_wait_for_bits_clear(&mmdc->mpwlgcr, MPWLGCR_HW_WL_EN,
99 MPWLGCR_HW_WL_EN);
100
101 mdelay(1);
102
103 out_be32(&mmdc->mdscr, CMD_ADDR_LSB_MR_ADDR(4) | MDSCR_ENABLE_CON_REQ |
104 CMD_LOAD_MODE_REG | CMD_BANK_ADDR_1);
105 out_be32(&mmdc->mdscr, MDSCR_ENABLE_CON_REQ);
106
107 mdelay(1);
108
109 /* 9b. read DQS gating calibration */
110 out_be32(&mmdc->mdscr, CMD_ADDR_MSB_MR_OP(4) | MDSCR_ENABLE_CON_REQ |
111 CMD_PRECHARGE_BANK_OPEN | CMD_BANK_ADDR_0);
112
113 out_be32(&mmdc->mdscr, CMD_ADDR_LSB_MR_ADDR(4) | MDSCR_ENABLE_CON_REQ |
114 CMD_LOAD_MODE_REG | CMD_BANK_ADDR_3);
115
116 out_be32(&mmdc->mppdcmpr2, MPPDCMPR2_MPR_COMPARE_EN);
117
118 /* set absolute read delay offset */
119#if defined(CONFIG_MMDC_MPRDDLCTL)
120 out_be32(&mmdc->mprddlctl, CONFIG_MMDC_MPRDDLCTL);
121#else
122 out_be32(&mmdc->mprddlctl, MMDC_MPRDDLCTL_DEFAULT_DELAY);
123#endif
124 set_wait_for_bits_clear(&mmdc->mpdgctrl0,
125 AUTO_RD_DQS_GATING_CALIBRATION_EN,
126 AUTO_RD_DQS_GATING_CALIBRATION_EN);
127
128 out_be32(&mmdc->mdscr, MDSCR_ENABLE_CON_REQ | CMD_LOAD_MODE_REG |
129 CMD_BANK_ADDR_3);
130
131 /* 9c. read calibration */
132 out_be32(&mmdc->mdscr, CMD_ADDR_MSB_MR_OP(4) | MDSCR_ENABLE_CON_REQ |
133 CMD_PRECHARGE_BANK_OPEN | CMD_BANK_ADDR_0);
134 out_be32(&mmdc->mdscr, CMD_ADDR_LSB_MR_ADDR(4) | MDSCR_ENABLE_CON_REQ |
135 CMD_LOAD_MODE_REG | CMD_BANK_ADDR_3);
136 out_be32(&mmdc->mppdcmpr2, MPPDCMPR2_MPR_COMPARE_EN);
137 set_wait_for_bits_clear(&mmdc->mprddlhwctl,
138 MPRDDLHWCTL_AUTO_RD_CALIBRATION_EN,
139 MPRDDLHWCTL_AUTO_RD_CALIBRATION_EN);
140
141 out_be32(&mmdc->mdscr, MDSCR_ENABLE_CON_REQ | CMD_LOAD_MODE_REG |
142 CMD_BANK_ADDR_3);
143
144 /* 10. configure power-down, self-refresh entry, exit parameters */
145 out_be32(&mmdc->mdpdc, CONFIG_MMDC_MDPDC);
146 out_be32(&mmdc->mapsr, MMDC_MAPSR_PWR_SAV_CTRL_STAT);
147
148 /* 11. ZQ config again? do nothing here */
149
150 /* 12. refresh scheme */
151 set_wait_for_bits_clear(&mmdc->mdref, CONFIG_MMDC_MDREF,
152 MDREF_START_REFRESH);
153
154 /* 13. disable CON_REQ */
155 out_be32(&mmdc->mdscr, MDSCR_DISABLE_CFG_REQ);
156}