]>
git.ipfire.org Git - people/ms/u-boot.git/blob - arch/arm/cpu/armv7/omap3/emif4.c
3 * Vaibhav Hiremath <hvaibhav@ti.com>
5 * Based on mem.c and sdrc.c
8 * Texas Instruments Incorporated - http://www.ti.com/
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License as
12 * published by the Free Software Foundation; either version 2 of
13 * the License, or (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
28 #include <asm/arch/mem.h>
29 #include <asm/arch/sys_proto.h>
30 #include <asm/arch/emif4.h>
32 extern omap3_sysinfo sysinfo
;
34 static emif4_t
*emif4_base
= (emif4_t
*)OMAP34XX_SDRC_BASE
;
38 * - Return 1 if mem type in use is SDR
47 * - Get size of chip select 0/1
49 u32
get_sdr_cs_size(u32 cs
)
53 /* TODO: Calculate the size based on EMIF4 configuration */
55 size
= CONFIG_SYS_CS0_SIZE
;
62 * - Get offset of cs from cs0 start
64 u32
get_sdr_cs_offset(u32 cs
)
73 * - Init the emif4 module for DDR access
74 * - Early init routines, called from flash or SRAM.
76 void do_emif4_init(void)
79 /* Set the DDR PHY parameters in PHY ctrl registers */
80 regval
= (EMIF4_DDR1_READ_LAT
| EMIF4_DDR1_PWRDN_DIS
|
81 EMIF4_DDR1_EXT_STRB_DIS
);
82 writel(regval
, &emif4_base
->ddr_phyctrl1
);
83 writel(regval
, &emif4_base
->ddr_phyctrl1_shdw
);
84 writel(0, &emif4_base
->ddr_phyctrl2
);
86 /* Reset the DDR PHY and wait till completed */
87 regval
= readl(&emif4_base
->sdram_iodft_tlgc
);
89 writel(regval
, &emif4_base
->sdram_iodft_tlgc
);
90 /*Wait till that bit clears*/
91 while ((readl(&emif4_base
->sdram_iodft_tlgc
) & (1<<10)) == 0x1);
92 /*Re-verify the DDR PHY status*/
93 while ((readl(&emif4_base
->sdram_sts
) & (1<<2)) == 0x0);
96 writel(regval
, &emif4_base
->sdram_iodft_tlgc
);
97 /* Set SDR timing registers */
98 regval
= (EMIF4_TIM1_T_WTR
| EMIF4_TIM1_T_RRD
|
99 EMIF4_TIM1_T_RC
| EMIF4_TIM1_T_RAS
|
100 EMIF4_TIM1_T_WR
| EMIF4_TIM1_T_RCD
|
102 writel(regval
, &emif4_base
->sdram_time1
);
103 writel(regval
, &emif4_base
->sdram_time1_shdw
);
105 regval
= (EMIF4_TIM2_T_CKE
| EMIF4_TIM2_T_RTP
|
106 EMIF4_TIM2_T_XSRD
| EMIF4_TIM2_T_XSNR
|
107 EMIF4_TIM2_T_ODT
| EMIF4_TIM2_T_XP
);
108 writel(regval
, &emif4_base
->sdram_time2
);
109 writel(regval
, &emif4_base
->sdram_time2_shdw
);
111 regval
= (EMIF4_TIM3_T_RAS_MAX
| EMIF4_TIM3_T_RFC
);
112 writel(regval
, &emif4_base
->sdram_time3
);
113 writel(regval
, &emif4_base
->sdram_time3_shdw
);
115 /* Set the PWR control register */
116 regval
= (EMIF4_PWR_PM_TIM
| EMIF4_PWR_LP_MODE
|
117 EMIF4_PWR_DPD_DIS
| EMIF4_PWR_IDLE_MODE
);
118 writel(regval
, &emif4_base
->sdram_pwr_mgmt
);
119 writel(regval
, &emif4_base
->sdram_pwr_mgmt_shdw
);
121 /* Set the DDR refresh rate control register */
122 regval
= (EMIF4_REFRESH_RATE
| EMIF4_INITREF_DIS
);
123 writel(regval
, &emif4_base
->sdram_refresh_ctrl
);
124 writel(regval
, &emif4_base
->sdram_refresh_ctrl_shdw
);
126 /* set the SDRAM configuration register */
127 regval
= (EMIF4_CFG_PGSIZE
| EMIF4_CFG_EBANK
|
128 EMIF4_CFG_IBANK
| EMIF4_CFG_ROWSIZE
|
129 EMIF4_CFG_CL
| EMIF4_CFG_NARROW_MD
|
130 EMIF4_CFG_SDR_DRV
| EMIF4_CFG_DDR_DIS_DLL
|
131 EMIF4_CFG_DDR2_DDQS
| EMIF4_CFG_DDR_TERM
|
132 EMIF4_CFG_IBANK_POS
| EMIF4_CFG_SDRAM_TYP
);
133 writel(regval
, &emif4_base
->sdram_config
);
138 * - Sets uboots idea of sdram size
142 DECLARE_GLOBAL_DATA_PTR
;
143 unsigned int size0
= 0, size1
= 0;
145 size0
= get_sdr_cs_size(CS0
);
147 * If a second bank of DDR is attached to CS1 this is
148 * where it can be started. Early init code will init
151 if ((sysinfo
.mtype
== DDR_COMBO
) || (sysinfo
.mtype
== DDR_STACKED
))
152 size1
= get_sdr_cs_size(CS1
);
154 gd
->ram_size
= size0
+ size1
;
158 void dram_init_banksize (void)
160 DECLARE_GLOBAL_DATA_PTR
;
161 unsigned int size0
= 0, size1
= 0;
163 size0
= get_sdr_cs_size(CS0
);
164 size1
= get_sdr_cs_size(CS1
);
166 gd
->bd
->bi_dram
[0].start
= PHYS_SDRAM_1
;
167 gd
->bd
->bi_dram
[0].size
= size0
;
168 gd
->bd
->bi_dram
[1].start
= PHYS_SDRAM_1
+ get_sdr_cs_offset(CS1
);
169 gd
->bd
->bi_dram
[1].size
= size1
;
174 * - Initialize memory subsystem