63 lines
1.7 KiB
ArmAsm
63 lines
1.7 KiB
ArmAsm
|
/* SPDX-License-Identifier: (GPL-2.0+ OR MIT) */
|
||
|
/*
|
||
|
* Copyright (c) 2018 Microsemi Corporation
|
||
|
*/
|
||
|
|
||
|
#include <asm/asm.h>
|
||
|
#include <asm/regdef.h>
|
||
|
|
||
|
#define BASE_MACRO 0x600a0000
|
||
|
#define REG_OFFSET(t, o) (t + (o*4))
|
||
|
#define REG_MACRO(x) REG_OFFSET(BASE_MACRO, x)
|
||
|
#define BIT(nr) (1 << (nr))
|
||
|
|
||
|
#define MACRO_CTRL_PLL5G_STATUS_PLL5G_STATUS0 REG_MACRO(6)
|
||
|
#define MACRO_CTRL_PLL5G_STATUS_PLL5G_STATUS0_LOCK_STATUS BIT(0)
|
||
|
#define MACRO_CTRL_PLL5G_CFG_PLL5G_CFG2 REG_MACRO(2)
|
||
|
#define MACRO_CTRL_PLL5G_CFG_PLL5G_CFG0 REG_MACRO(0)
|
||
|
#define MACRO_CTRL_PLL5G_CFG_PLL5G_CFG0_CPU_CLK_DIV (0x3F << 6)
|
||
|
#define MACRO_CTRL_PLL5G_CFG_PLL5G_CFG0_CPU_CLK_DIV_ENC(x) (x << 6)
|
||
|
|
||
|
.set noreorder
|
||
|
LEAF(pll_init)
|
||
|
/* Make sure PLL is locked */
|
||
|
lw v0, MACRO_CTRL_PLL5G_STATUS_PLL5G_STATUS0
|
||
|
andi v1, v0, MACRO_CTRL_PLL5G_STATUS_PLL5G_STATUS0_LOCK_STATUS
|
||
|
bne v1, zero, 1f
|
||
|
nop
|
||
|
|
||
|
/* Black magic from frontend */
|
||
|
li v1, 0x00610400
|
||
|
sw v1, MACRO_CTRL_PLL5G_CFG_PLL5G_CFG2
|
||
|
|
||
|
li v1, 0x00610c00
|
||
|
sw v1, MACRO_CTRL_PLL5G_CFG_PLL5G_CFG2
|
||
|
|
||
|
li v1, 0x00610800
|
||
|
sw v1, MACRO_CTRL_PLL5G_CFG_PLL5G_CFG2
|
||
|
|
||
|
li v1, 0x00610000
|
||
|
sw v1, MACRO_CTRL_PLL5G_CFG_PLL5G_CFG2
|
||
|
|
||
|
/* Wait for lock */
|
||
|
2: lw v0, MACRO_CTRL_PLL5G_STATUS_PLL5G_STATUS0
|
||
|
andi v1, v0, MACRO_CTRL_PLL5G_STATUS_PLL5G_STATUS0_LOCK_STATUS
|
||
|
/* Keep looping if zero (no lock bit yet) */
|
||
|
beq v1, zero, 2b
|
||
|
nop
|
||
|
|
||
|
/* Setup PLL CPU clock divider for 416MHz */
|
||
|
1: lw v0, MACRO_CTRL_PLL5G_CFG_PLL5G_CFG0
|
||
|
|
||
|
/* Keep reserved bits */
|
||
|
li v1, ~MACRO_CTRL_PLL5G_CFG_PLL5G_CFG0_CPU_CLK_DIV
|
||
|
and v0, v0, v1
|
||
|
|
||
|
/* Set code 6 ~ 416.66 MHz */
|
||
|
ori v0, v0, MACRO_CTRL_PLL5G_CFG_PLL5G_CFG0_CPU_CLK_DIV_ENC(6)
|
||
|
|
||
|
sw v0, MACRO_CTRL_PLL5G_CFG_PLL5G_CFG0
|
||
|
jr ra
|
||
|
nop
|
||
|
END(pll_init)
|