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gerrit.cesnet.cz / github / trini / u-boot / 7c9267e5115f5cae729a27a0c8ecc35d6297f2b3 / . / arch / arm / mach-sunxi / clock_sun8i_a83t.c
blob: 31e4281529ad77e2df8579da0bed43b5dcb812c5 [file] [log] [blame]
Tom Rini83d290c2018-05-06 17:58:06 -0400[diff] [blame]1// SPDX-License-Identifier: GPL-2.0+
vishnupatekarf5429482015-11-29 01:07:24 +0800[diff] [blame]2/*
3 * A83 specific clock code
4 *
5 * (C) Copyright 2007-2012
6 * Allwinner Technology Co., Ltd. <www.allwinnertech.com>
7 * Tom Cubie <tangliang@allwinnertech.com>
8 *
9 * (C) Copyright 2015 Vishnu Patekar <vishnupatekar0510@gmail.com>
vishnupatekarf5429482015-11-29 01:07:24 +0800[diff] [blame]10 */
11
12#include <common.h>
13#include <asm/io.h>
14#include <asm/arch/clock.h>
15#include <asm/arch/prcm.h>
16#include <asm/arch/sys_proto.h>
Simon Glassc05ed002020-05-10 11:40:11 -0600[diff] [blame]17#include <linux/delay.h>
vishnupatekarf5429482015-11-29 01:07:24 +0800[diff] [blame]18
19#ifdef CONFIG_SPL_BUILD
20void clock_init_safe(void)
21{
22 struct sunxi_ccm_reg * const ccm =
23 (struct sunxi_ccm_reg *)SUNXI_CCM_BASE;
24
25 clock_set_pll1(408000000);
26 /* enable pll_hsic, default is 480M */
27 writel(PLL8_CFG_DEFAULT, &ccm->pll8_cfg);
28 writel(readl(&ccm->pll8_cfg) | (0x1 << 31), &ccm->pll8_cfg);
29 while (!(readl(&ccm->pll_stable_status) & (1 << 8))) {}
30
31 /* switch to default 24MHz before changing to hsic */
32 writel(0x0, &ccm->cci400_cfg);
33 sdelay(50);
34 writel(CCM_CCI400_CLK_SEL_HSIC, &ccm->cci400_cfg);
35 sdelay(100);
36
37 /* switch before changing pll6 */
38 clrsetbits_le32(&ccm->ahb1_apb1_div, AHB1_CLK_SRC_MASK,
39 AHB1_CLK_SRC_OSC24M);
40 writel(PLL6_CFG_DEFAULT, &ccm->pll6_cfg);
41 while (!(readl(&ccm->pll_stable_status) & (1 << 6))) {}
42
43 writel(AHB1_ABP1_DIV_DEFAULT, &ccm->ahb1_apb1_div);
44 writel(CCM_MBUS_RESET_RESET, &ccm->mbus_reset);
45 writel(MBUS_CLK_DEFAULT, &ccm->mbus_clk_cfg);
46
47 /* timestamp */
48 writel(1, 0x01720000);
49}
50#endif
51
52void clock_init_uart(void)
53{
54 struct sunxi_ccm_reg *const ccm =
55 (struct sunxi_ccm_reg *)SUNXI_CCM_BASE;
56
57 /* uart clock source is apb2 */
58 writel(APB2_CLK_SRC_OSC24M|
59 APB2_CLK_RATE_N_1|
60 APB2_CLK_RATE_M(1),
61 &ccm->apb2_div);
62
63 /* open the clock for uart */
64 setbits_le32(&ccm->apb2_gate,
65 CLK_GATE_OPEN << (APB2_GATE_UART_SHIFT +
66 CONFIG_CONS_INDEX - 1));
67
68 /* deassert uart reset */
69 setbits_le32(&ccm->apb2_reset_cfg,
70 1 << (APB2_RESET_UART_SHIFT +
71 CONFIG_CONS_INDEX - 1));
72}
73
74#ifdef CONFIG_SPL_BUILD
75void clock_set_pll1(unsigned int clk)
76{
77 struct sunxi_ccm_reg * const ccm =
78 (struct sunxi_ccm_reg *)SUNXI_CCM_BASE;
79 const int p = 0;
80
81 /* Switch to 24MHz clock while changing PLL1 */
82 writel(AXI_DIV_2 << AXI0_DIV_SHIFT |
83 AXI_DIV_2 << AXI1_DIV_SHIFT |
84 CPU_CLK_SRC_OSC24M << C0_CPUX_CLK_SRC_SHIFT |
85 CPU_CLK_SRC_OSC24M << C1_CPUX_CLK_SRC_SHIFT,
86 &ccm->cpu_axi_cfg);
87
88 /* clk = 24*n/p, p is ignored if clock is >288MHz */
89 writel(CCM_PLL1_CTRL_EN | CCM_PLL1_CTRL_P(p) | CMM_PLL1_CLOCK_TIME_2 |
90 CCM_PLL1_CTRL_N(clk / 24000000),
91 &ccm->pll1_c0_cfg);
92 while (!(readl(&ccm->pll_stable_status) & 0x01)) {}
93
94 writel(CCM_PLL1_CTRL_EN | CCM_PLL1_CTRL_P(p) | CMM_PLL1_CLOCK_TIME_2 |
95 CCM_PLL1_CTRL_N(clk / (24000000)),
96 &ccm->pll1_c1_cfg);
97 while (!(readl(&ccm->pll_stable_status) & 0x02)) {}
98
99 /* Switch CPU to PLL1 */
100 writel(AXI_DIV_2 << AXI0_DIV_SHIFT |
101 AXI_DIV_2 << AXI1_DIV_SHIFT |
102 CPU_CLK_SRC_PLL1 << C0_CPUX_CLK_SRC_SHIFT |
103 CPU_CLK_SRC_PLL1 << C1_CPUX_CLK_SRC_SHIFT,
104 &ccm->cpu_axi_cfg);
105}
106#endif
107
108void clock_set_pll5(unsigned int clk)
109{
110 struct sunxi_ccm_reg * const ccm =
111 (struct sunxi_ccm_reg *)SUNXI_CCM_BASE;
112 unsigned int div1 = 0, div2 = 0;
113
114 /* A83T PLL5 DDR rate = 24000000 * (n+1)/(div1+1)/(div2+1) */
115 writel(CCM_PLL5_CTRL_EN | CCM_PLL5_CTRL_UPD |
116 CCM_PLL5_CTRL_N(clk / (24000000)) |
117 div2 << CCM_PLL5_DIV2_SHIFT |
118 div1 << CCM_PLL5_DIV1_SHIFT, &ccm->pll5_cfg);
119
120 udelay(5500);
121}
122
123
124unsigned int clock_get_pll6(void)
125{
126 struct sunxi_ccm_reg *const ccm =
127 (struct sunxi_ccm_reg *)SUNXI_CCM_BASE;
128
129 uint32_t rval = readl(&ccm->pll6_cfg);
130 int n = ((rval & CCM_PLL6_CTRL_N_MASK) >> CCM_PLL6_CTRL_N_SHIFT);
131 int div1 = ((rval & CCM_PLL6_CTRL_DIV1_MASK) >>
132 CCM_PLL6_CTRL_DIV1_SHIFT) + 1;
133 int div2 = ((rval & CCM_PLL6_CTRL_DIV2_MASK) >>
134 CCM_PLL6_CTRL_DIV2_SHIFT) + 1;
135 return 24000000 * n / div1 / div2;
136}