/
clk-imx23.c
170 lines (146 loc) · 6.27 KB
/
clk-imx23.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright 2012 Freescale Semiconductor, Inc.
*/
#include <linux/clk/mxs.h>
#include <linux/clk.h>
#include <linux/clk-provider.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include "clk.h"
static void __iomem *clkctrl;
static void __iomem *digctrl;
#define CLKCTRL clkctrl
#define DIGCTRL digctrl
#define PLLCTRL0 (CLKCTRL + 0x0000)
#define CPU (CLKCTRL + 0x0020)
#define HBUS (CLKCTRL + 0x0030)
#define XBUS (CLKCTRL + 0x0040)
#define XTAL (CLKCTRL + 0x0050)
#define PIX (CLKCTRL + 0x0060)
#define SSP (CLKCTRL + 0x0070)
#define GPMI (CLKCTRL + 0x0080)
#define SPDIF (CLKCTRL + 0x0090)
#define EMI (CLKCTRL + 0x00a0)
#define SAIF (CLKCTRL + 0x00c0)
#define TV (CLKCTRL + 0x00d0)
#define ETM (CLKCTRL + 0x00e0)
#define FRAC (CLKCTRL + 0x00f0)
#define CLKSEQ (CLKCTRL + 0x0110)
#define BP_CPU_INTERRUPT_WAIT 12
#define BP_CLKSEQ_BYPASS_SAIF 0
#define BP_CLKSEQ_BYPASS_SSP 5
#define BP_SAIF_DIV_FRAC_EN 16
#define BP_FRAC_IOFRAC 24
static void __init clk_misc_init(void)
{
u32 val;
/* Gate off cpu clock in WFI for power saving */
writel_relaxed(1 << BP_CPU_INTERRUPT_WAIT, CPU + SET);
/* Clear BYPASS for SAIF */
writel_relaxed(1 << BP_CLKSEQ_BYPASS_SAIF, CLKSEQ + CLR);
/* SAIF has to use frac div for functional operation */
val = readl_relaxed(SAIF);
val |= 1 << BP_SAIF_DIV_FRAC_EN;
writel_relaxed(val, SAIF);
/*
* Source ssp clock from ref_io than ref_xtal,
* as ref_xtal only provides 24 MHz as maximum.
*/
writel_relaxed(1 << BP_CLKSEQ_BYPASS_SSP, CLKSEQ + CLR);
/*
* 480 MHz seems too high to be ssp clock source directly,
* so set frac to get a 288 MHz ref_io.
*/
writel_relaxed(0x3f << BP_FRAC_IOFRAC, FRAC + CLR);
writel_relaxed(30 << BP_FRAC_IOFRAC, FRAC + SET);
}
static const char *const sel_pll[] __initconst = { "pll", "ref_xtal", };
static const char *const sel_cpu[] __initconst = { "ref_cpu", "ref_xtal", };
static const char *const sel_pix[] __initconst = { "ref_pix", "ref_xtal", };
static const char *const sel_io[] __initconst = { "ref_io", "ref_xtal", };
static const char *const cpu_sels[] __initconst = { "cpu_pll", "cpu_xtal", };
static const char *const emi_sels[] __initconst = { "emi_pll", "emi_xtal", };
enum imx23_clk {
ref_xtal, pll, ref_cpu, ref_emi, ref_pix, ref_io, saif_sel,
lcdif_sel, gpmi_sel, ssp_sel, emi_sel, cpu, etm_sel, cpu_pll,
cpu_xtal, hbus, xbus, lcdif_div, ssp_div, gpmi_div, emi_pll,
emi_xtal, etm_div, saif_div, clk32k_div, rtc, adc, spdif_div,
clk32k, dri, pwm, filt, uart, ssp, gpmi, spdif, emi, saif,
lcdif, etm, usb, usb_phy,
clk_max
};
static struct clk *clks[clk_max];
static struct clk_onecell_data clk_data;
static enum imx23_clk clks_init_on[] __initdata = {
cpu, hbus, xbus, emi, uart,
};
static void __init mx23_clocks_init(struct device_node *np)
{
struct device_node *dcnp;
u32 i;
dcnp = of_find_compatible_node(NULL, NULL, "fsl,imx23-digctl");
digctrl = of_iomap(dcnp, 0);
WARN_ON(!digctrl);
of_node_put(dcnp);
clkctrl = of_iomap(np, 0);
WARN_ON(!clkctrl);
clk_misc_init();
clks[ref_xtal] = mxs_clk_fixed("ref_xtal", 24000000);
clks[pll] = mxs_clk_pll("pll", "ref_xtal", PLLCTRL0, 16, 480000000);
clks[ref_cpu] = mxs_clk_ref("ref_cpu", "pll", FRAC, 0);
clks[ref_emi] = mxs_clk_ref("ref_emi", "pll", FRAC, 1);
clks[ref_pix] = mxs_clk_ref("ref_pix", "pll", FRAC, 2);
clks[ref_io] = mxs_clk_ref("ref_io", "pll", FRAC, 3);
clks[saif_sel] = mxs_clk_mux("saif_sel", CLKSEQ, 0, 1, sel_pll, ARRAY_SIZE(sel_pll));
clks[lcdif_sel] = mxs_clk_mux("lcdif_sel", CLKSEQ, 1, 1, sel_pix, ARRAY_SIZE(sel_pix));
clks[gpmi_sel] = mxs_clk_mux("gpmi_sel", CLKSEQ, 4, 1, sel_io, ARRAY_SIZE(sel_io));
clks[ssp_sel] = mxs_clk_mux("ssp_sel", CLKSEQ, 5, 1, sel_io, ARRAY_SIZE(sel_io));
clks[emi_sel] = mxs_clk_mux("emi_sel", CLKSEQ, 6, 1, emi_sels, ARRAY_SIZE(emi_sels));
clks[cpu] = mxs_clk_mux("cpu", CLKSEQ, 7, 1, cpu_sels, ARRAY_SIZE(cpu_sels));
clks[etm_sel] = mxs_clk_mux("etm_sel", CLKSEQ, 8, 1, sel_cpu, ARRAY_SIZE(sel_cpu));
clks[cpu_pll] = mxs_clk_div("cpu_pll", "ref_cpu", CPU, 0, 6, 28);
clks[cpu_xtal] = mxs_clk_div("cpu_xtal", "ref_xtal", CPU, 16, 10, 29);
clks[hbus] = mxs_clk_div("hbus", "cpu", HBUS, 0, 5, 29);
clks[xbus] = mxs_clk_div("xbus", "ref_xtal", XBUS, 0, 10, 31);
clks[lcdif_div] = mxs_clk_div("lcdif_div", "lcdif_sel", PIX, 0, 12, 29);
clks[ssp_div] = mxs_clk_div("ssp_div", "ssp_sel", SSP, 0, 9, 29);
clks[gpmi_div] = mxs_clk_div("gpmi_div", "gpmi_sel", GPMI, 0, 10, 29);
clks[emi_pll] = mxs_clk_div("emi_pll", "ref_emi", EMI, 0, 6, 28);
clks[emi_xtal] = mxs_clk_div("emi_xtal", "ref_xtal", EMI, 8, 4, 29);
clks[etm_div] = mxs_clk_div("etm_div", "etm_sel", ETM, 0, 6, 29);
clks[saif_div] = mxs_clk_frac("saif_div", "saif_sel", SAIF, 0, 16, 29);
clks[clk32k_div] = mxs_clk_fixed_factor("clk32k_div", "ref_xtal", 1, 750);
clks[rtc] = mxs_clk_fixed_factor("rtc", "ref_xtal", 1, 768);
clks[adc] = mxs_clk_fixed_factor("adc", "clk32k", 1, 16);
clks[spdif_div] = mxs_clk_fixed_factor("spdif_div", "pll", 1, 4);
clks[clk32k] = mxs_clk_gate("clk32k", "clk32k_div", XTAL, 26);
clks[dri] = mxs_clk_gate("dri", "ref_xtal", XTAL, 28);
clks[pwm] = mxs_clk_gate("pwm", "ref_xtal", XTAL, 29);
clks[filt] = mxs_clk_gate("filt", "ref_xtal", XTAL, 30);
clks[uart] = mxs_clk_gate("uart", "ref_xtal", XTAL, 31);
clks[ssp] = mxs_clk_gate("ssp", "ssp_div", SSP, 31);
clks[gpmi] = mxs_clk_gate("gpmi", "gpmi_div", GPMI, 31);
clks[spdif] = mxs_clk_gate("spdif", "spdif_div", SPDIF, 31);
clks[emi] = mxs_clk_gate("emi", "emi_sel", EMI, 31);
clks[saif] = mxs_clk_gate("saif", "saif_div", SAIF, 31);
clks[lcdif] = mxs_clk_gate("lcdif", "lcdif_div", PIX, 31);
clks[etm] = mxs_clk_gate("etm", "etm_div", ETM, 31);
clks[usb] = mxs_clk_gate("usb", "usb_phy", DIGCTRL, 2);
clks[usb_phy] = clk_register_gate(NULL, "usb_phy", "pll", 0, PLLCTRL0, 18, 0, &mxs_lock);
for (i = 0; i < ARRAY_SIZE(clks); i++)
if (IS_ERR(clks[i])) {
pr_err("i.MX23 clk %d: register failed with %ld\n",
i, PTR_ERR(clks[i]));
return;
}
clk_data.clks = clks;
clk_data.clk_num = ARRAY_SIZE(clks);
of_clk_add_provider(np, of_clk_src_onecell_get, &clk_data);
for (i = 0; i < ARRAY_SIZE(clks_init_on); i++)
clk_prepare_enable(clks[clks_init_on[i]]);
}
CLK_OF_DECLARE(imx23_clkctrl, "fsl,imx23-clkctrl", mx23_clocks_init);