blob: 897a5890ed1ae35e3cd233986dd73d33a73c6ab9 [file] [log] [blame]
Aubrey Li26bf7de2007-03-19 01:24:52 +08001#define ASSEMBLY
2
3#include <linux/config.h>
4#include <config.h>
5#include <asm/blackfin.h>
6#include <asm/mem_init.h>
7.global init_sdram;
8
9#if (BFIN_BOOT_MODE != BF537_UART_BOOT)
10#if (CONFIG_CCLK_DIV == 1)
11#define CONFIG_CCLK_ACT_DIV CCLK_DIV1
12#endif
13#if (CONFIG_CCLK_DIV == 2)
14#define CONFIG_CCLK_ACT_DIV CCLK_DIV2
15#endif
16#if (CONFIG_CCLK_DIV == 4)
17#define CONFIG_CCLK_ACT_DIV CCLK_DIV4
18#endif
19#if (CONFIG_CCLK_DIV == 8)
20#define CONFIG_CCLK_ACT_DIV CCLK_DIV8
21#endif
22#ifndef CONFIG_CCLK_ACT_DIV
23#define CONFIG_CCLK_ACT_DIV CONFIG_CCLK_DIV_not_defined_properly
24#endif
25#endif
26
27init_sdram:
28 [--SP] = ASTAT;
29 [--SP] = RETS;
30 [--SP] = (R7:0);
31 [--SP] = (P5:0);
32
33#if (BFIN_BOOT_MODE == BF537_SPI_MASTER_BOOT)
34 p0.h = hi(SIC_IWR);
35 p0.l = lo(SIC_IWR);
36 r0.l = 0x1;
37 w[p0] = r0.l;
38 SSYNC;
39
40 p0.h = hi(SPI_BAUD);
41 p0.l = lo(SPI_BAUD);
42 r0.l = CONFIG_SPI_BAUD;
43 w[p0] = r0.l;
44 SSYNC;
45#endif
46
47#if (BFIN_BOOT_MODE != BF537_UART_BOOT)
48
49#ifdef CONFIG_BF537
50 /* Enable PHY CLK buffer output */
51 p0.h = hi(VR_CTL);
52 p0.l = lo(VR_CTL);
53 r0.l = w[p0];
54 bitset(r0, 14);
55 w[p0] = r0.l;
56 ssync;
57#endif
58 /*
59 * PLL_LOCKCNT - how many SCLK Cycles to delay while PLL becomes stable
60 */
61 p0.h = hi(PLL_LOCKCNT);
62 p0.l = lo(PLL_LOCKCNT);
63 r0 = 0x300(Z);
64 w[p0] = r0.l;
65 ssync;
66
67 /*
68 * Put SDRAM in self-refresh, incase anything is running
69 */
70 P2.H = hi(EBIU_SDGCTL);
71 P2.L = lo(EBIU_SDGCTL);
72 R0 = [P2];
73 BITSET (R0, 24);
74 [P2] = R0;
75 SSYNC;
76
77 /*
78 * Set PLL_CTL with the value that we calculate in R0
79 * - [14:09] = MSEL[5:0] : CLKIN / VCO multiplication factors
80 * - [8] = BYPASS : BYPASS the PLL, run CLKIN into CCLK/SCLK
81 * - [7] = output delay (add 200ps of delay to mem signals)
82 * - [6] = input delay (add 200ps of input delay to mem signals)
83 * - [5] = PDWN : 1=All Clocks off
84 * - [3] = STOPCK : 1=Core Clock off
85 * - [1] = PLL_OFF : 1=Disable Power to PLL
86 * - [0] = DF : 1=Pass CLKIN/2 to PLL / 0=Pass CLKIN to PLL
87 * all other bits set to zero
88 */
89
90 r0 = CONFIG_VCO_MULT & 63; /* Load the VCO multiplier */
91 r0 = r0 << 9; /* Shift it over */
92 r1 = CONFIG_CLKIN_HALF; /* Do we need to divide CLKIN by 2?*/
93 r0 = r1 | r0;
94 r1 = CONFIG_PLL_BYPASS; /* Bypass the PLL? */
95 r1 = r1 << 8; /* Shift it over */
96 r0 = r1 | r0; /* add them all together */
97
98 p0.h = hi(PLL_CTL);
99 p0.l = lo(PLL_CTL); /* Load the address */
100 cli r2; /* Disable interrupts */
101 ssync;
102 w[p0] = r0.l; /* Set the value */
103 idle; /* Wait for the PLL to stablize */
104 sti r2; /* Enable interrupts */
105
106check_again:
107 p0.h = hi(PLL_STAT);
108 p0.l = lo(PLL_STAT);
109 R0 = W[P0](Z);
110 CC = BITTST(R0,5);
111 if ! CC jump check_again;
112
113 /* Configure SCLK & CCLK Dividers */
114 r0 = (CONFIG_CCLK_ACT_DIV | CONFIG_SCLK_DIV);
115 p0.h = hi(PLL_DIV);
116 p0.l = lo(PLL_DIV);
117 w[p0] = r0.l;
118 ssync;
119#endif
120
121 /*
122 * Now, Initialize the SDRAM,
123 * start with the SDRAM Refresh Rate Control Register
124 */
125 p0.l = lo(EBIU_SDRRC);
126 p0.h = hi(EBIU_SDRRC);
127 r0 = mem_SDRRC;
128 w[p0] = r0.l;
129 ssync;
130
131 /*
132 * SDRAM Memory Bank Control Register - bank specific parameters
133 */
134 p0.l = (EBIU_SDBCTL & 0xFFFF);
135 p0.h = (EBIU_SDBCTL >> 16);
136 r0 = mem_SDBCTL;
137 w[p0] = r0.l;
138 ssync;
139
140 /*
141 * SDRAM Global Control Register - global programmable parameters
142 * Disable self-refresh
143 */
144 P2.H = hi(EBIU_SDGCTL);
145 P2.L = lo(EBIU_SDGCTL);
146 R0 = [P2];
147 BITCLR (R0, 24);
148
149 /*
150 * Check if SDRAM is already powered up, if it is, enable self-refresh
151 */
152 p0.h = hi(EBIU_SDSTAT);
153 p0.l = lo(EBIU_SDSTAT);
154 r2.l = w[p0];
155 cc = bittst(r2,3);
156 if !cc jump skip;
157 NOP;
158 BITSET (R0, 23);
159skip:
160 [P2] = R0;
161 SSYNC;
162
163 /* Write in the new value in the register */
164 R0.L = lo(mem_SDGCTL);
165 R0.H = hi(mem_SDGCTL);
166 [P2] = R0;
167 SSYNC;
168 nop;
169
170 (P5:0) = [SP++];
171 (R7:0) = [SP++];
172 RETS = [SP++];
173 ASTAT = [SP++];
174 RTS;