1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * linux/arch/arm/plat-omap/sram-fn.S
4 *
5 * Functions that need to be run in internal S
6 */
7
8 #include <linux/linkage.h>
9 #include <linux/soc/ti/omap1-io.h>
10
11 #include <asm/assembler.h>
12
13 #include "hardware.h"
14 #include "iomap.h"
15
16 .text
17
18 /*
19 * Reprograms ULPD and CKCTL.
20 */
21 .align 3
22 ENTRY(omap1_sram_reprogram_clock)
23 stmfd sp!, {r0 - r12, lr}
24
25 mov r2, #OMAP1_IO_ADDRESS(DPLL_CTL
26 orr r2, r2, #OMAP1_IO_ADDRESS(DPLL
27 orr r2, r2, #OMAP1_IO_ADDRESS(DPLL
28
29 mov r3, #OMAP1_IO_ADDRESS(ARM_CKCT
30 orr r3, r3, #OMAP1_IO_ADDRESS(ARM_
31 orr r3, r3, #OMAP1_IO_ADDRESS(ARM_
32
33 tst r0, #1 << 4
34 beq newck
35 bic r0, r0, #1 << 4
36 strh r0, [r2]
37 orr r0, r0, #1 << 4
38
39 newck:
40 strh r1, [r3]
41 strh r0, [r2]
42
43 mov r4, #0x0700
44 orr r4, r4, #0x00ff
45 delay: sub r4, r4, #1
46 cmp r4, #0
47 bne delay
48
49 lock: ldrh r4, [r2], #0
50 tst r0, #1 << 4
51 beq out
52 tst r4, #1 << 0
53 beq lock
54
55 out:
56 ldmfd sp!, {r0 - r12, pc}
57 ENTRY(omap1_sram_reprogram_clock_sz)
58 .word . - omap1_sram_reprogram_clock
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