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1/*
2 * linux/arch/arm/mach-omap3/sram.S
3 *
4 * Omap3 specific functions that need to be run in internal SRAM
5 *
6 * (C) Copyright 2007
7 * Texas Instruments Inc.
8 * Rajendra Nayak <rnayak@ti.com>
9 *
10 * (C) Copyright 2004
11 * Texas Instruments, <www.ti.com>
12 * Richard Woodruff <r-woodruff2@ti.com>
13 *
14 * This program is free software; you can redistribute it and/or
15 * modify it under the terms of the GNU General Public License as
16 * published by the Free Software Foundation; either version 2 of
17 * the License, or (at your option) any later version.
18 *
19 * This program is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR /PURPOSE. See the
22 * GNU General Public License for more details.
23 *
24 * You should have received a copy of the GNU General Public License
25 * along with this program; if not, write to the Free Software
26 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
27 * MA 02111-1307 USA
28 */
29#include <linux/linkage.h>
30#include <asm/assembler.h>
31#include <mach/hardware.h>
32
33#include <mach/io.h>
34
35#include "sdrc.h"
36#include "cm.h"
37
38 .text
39
40/*
41 * Change frequency of core dpll
42 * r0 = sdrc_rfr_ctrl r1 = sdrc_actim_ctrla r2 = sdrc_actim_ctrlb r3 = M2
43 */
44ENTRY(omap3_sram_configure_core_dpll)
45 stmfd sp!, {r1-r12, lr} @ store regs to stack
46 cmp r3, #0x2
47 blne configure_sdrc
48 cmp r3, #0x2
49 blne lock_dll
50 cmp r3, #0x1
51 blne unlock_dll
52 bl sdram_in_selfrefresh @ put the SDRAM in self refresh
53 bl configure_core_dpll
54 bl enable_sdrc
55 cmp r3, #0x1
56 blne wait_dll_unlock
57 cmp r3, #0x2
58 blne wait_dll_lock
59 cmp r3, #0x1
60 blne configure_sdrc
61 mov r0, #0 @ return value
62 ldmfd sp!, {r1-r12, pc} @ restore regs and return
63unlock_dll:
64 ldr r4, omap3_sdrc_dlla_ctrl
65 ldr r5, [r4]
66 orr r5, r5, #0x4
67 str r5, [r4]
68 bx lr
69lock_dll:
70 ldr r4, omap3_sdrc_dlla_ctrl
71 ldr r5, [r4]
72 bic r5, r5, #0x4
73 str r5, [r4]
74 bx lr
75sdram_in_selfrefresh:
76 mov r5, #0x0 @ Move 0 to R5
77 mcr p15, 0, r5, c7, c10, 5 @ memory barrier
78 ldr r4, omap3_sdrc_power @ read the SDRC_POWER register
79 ldr r5, [r4] @ read the contents of SDRC_POWER
80 orr r5, r5, #0x40 @ enable self refresh on idle req
81 str r5, [r4] @ write back to SDRC_POWER register
82 ldr r4, omap3_cm_iclken1_core @ read the CM_ICLKEN1_CORE reg
83 ldr r5, [r4]
84 bic r5, r5, #0x2 @ disable iclk bit for SRDC
85 str r5, [r4]
86wait_sdrc_idle:
87 ldr r4, omap3_cm_idlest1_core
88 ldr r5, [r4]
89 and r5, r5, #0x2 @ check for SDRC idle
90 cmp r5, #2
91 bne wait_sdrc_idle
92 bx lr
93configure_core_dpll:
94 ldr r4, omap3_cm_clksel1_pll
95 ldr r5, [r4]
96 ldr r6, core_m2_mask_val @ modify m2 for core dpll
97 and r5, r5, r6
98 orr r5, r5, r3, lsl #0x1B @ r3 contains the M2 val
99 str r5, [r4]
100 mov r5, #0x800 @ wait for the clock to stabilise
101 cmp r3, #2
102 bne wait_clk_stable
103 bx lr
104wait_clk_stable:
105 subs r5, r5, #1
106 bne wait_clk_stable
107 nop
108 nop
109 nop
110 nop
111 nop
112 nop
113 nop
114 nop
115 nop
116 nop
117 bx lr
118enable_sdrc:
119 ldr r4, omap3_cm_iclken1_core
120 ldr r5, [r4]
121 orr r5, r5, #0x2 @ enable iclk bit for SDRC
122 str r5, [r4]
123wait_sdrc_idle1:
124 ldr r4, omap3_cm_idlest1_core
125 ldr r5, [r4]
126 and r5, r5, #0x2
127 cmp r5, #0
128 bne wait_sdrc_idle1
129 ldr r4, omap3_sdrc_power
130 ldr r5, [r4]
131 bic r5, r5, #0x40
132 str r5, [r4]
133 bx lr
134wait_dll_lock:
135 ldr r4, omap3_sdrc_dlla_status
136 ldr r5, [r4]
137 and r5, r5, #0x4
138 cmp r5, #0x4
139 bne wait_dll_lock
140 bx lr
141wait_dll_unlock:
142 ldr r4, omap3_sdrc_dlla_status
143 ldr r5, [r4]
144 and r5, r5, #0x4
145 cmp r5, #0x0
146 bne wait_dll_unlock
147 bx lr
148configure_sdrc:
149 ldr r4, omap3_sdrc_rfr_ctrl
150 str r0, [r4]
151 ldr r4, omap3_sdrc_actim_ctrla
152 str r1, [r4]
153 ldr r4, omap3_sdrc_actim_ctrlb
154 str r2, [r4]
155 bx lr
156
157omap3_sdrc_power:
158 .word OMAP34XX_SDRC_REGADDR(SDRC_POWER)
159omap3_cm_clksel1_pll:
160 .word OMAP34XX_CM_REGADDR(PLL_MOD, CM_CLKSEL1)
161omap3_cm_idlest1_core:
162 .word OMAP34XX_CM_REGADDR(CORE_MOD, CM_IDLEST)
163omap3_cm_iclken1_core:
164 .word OMAP34XX_CM_REGADDR(CORE_MOD, CM_ICLKEN1)
165omap3_sdrc_rfr_ctrl:
166 .word OMAP34XX_SDRC_REGADDR(SDRC_RFR_CTRL_0)
167omap3_sdrc_actim_ctrla:
168 .word OMAP34XX_SDRC_REGADDR(SDRC_ACTIM_CTRL_A_0)
169omap3_sdrc_actim_ctrlb:
170 .word OMAP34XX_SDRC_REGADDR(SDRC_ACTIM_CTRL_B_0)
171omap3_sdrc_dlla_status:
172 .word OMAP34XX_SDRC_REGADDR(SDRC_DLLA_STATUS)
173omap3_sdrc_dlla_ctrl:
174 .word OMAP34XX_SDRC_REGADDR(SDRC_DLLA_CTRL)
175core_m2_mask_val:
176 .word 0x07FFFFFF
177
178ENTRY(omap3_sram_configure_core_dpll_sz)
179 .word . - omap3_sram_configure_core_dpll
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-19 20:57:35 -0500