1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (C) 2012 Sascha Hauer <kernel@pengutronix.de>
4 */
5
6#include <linux/module.h>
7#include <linux/clk.h>
8#include <linux/clkdev.h>
9#include <linux/io.h>
10#include <linux/err.h>
11#include <linux/of.h>
12#include <linux/of_address.h>
13#include <soc/imx/revision.h>
14#include <asm/irq.h>
15
16#include "clk.h"
17
18#define MX31_CCM_BASE_ADDR 0x53f80000
19#define MX31_GPT1_BASE_ADDR 0x53f90000
20#define MX31_INT_GPT (NR_IRQS_LEGACY + 29)
21
22#define MXC_CCM_CCMR 0x00
23#define MXC_CCM_PDR0 0x04
24#define MXC_CCM_PDR1 0x08
25#define MXC_CCM_MPCTL 0x10
26#define MXC_CCM_UPCTL 0x14
27#define MXC_CCM_SRPCTL 0x18
28#define MXC_CCM_CGR0 0x20
29#define MXC_CCM_CGR1 0x24
30#define MXC_CCM_CGR2 0x28
31#define MXC_CCM_PMCR0 0x5c
32
33static const char *mcu_main_sel[] = { "spll", "mpll", };
34static const char *per_sel[] = { "per_div", "ipg", };
35static const char *csi_sel[] = { "upll", "spll", };
36static const char *fir_sel[] = { "mcu_main", "upll", "spll" };
37
38enum mx31_clks {
39 dummy, ckih, ckil, mpll, spll, upll, mcu_main, hsp, ahb, nfc, ipg,
40 per_div, per, csi, fir, csi_div, usb_div_pre, usb_div_post, fir_div_pre,
41 fir_div_post, sdhc1_gate, sdhc2_gate, gpt_gate, epit1_gate, epit2_gate,
42 iim_gate, ata_gate, sdma_gate, cspi3_gate, rng_gate, uart1_gate,
43 uart2_gate, ssi1_gate, i2c1_gate, i2c2_gate, i2c3_gate, hantro_gate,
44 mstick1_gate, mstick2_gate, csi_gate, rtc_gate, wdog_gate, pwm_gate,
45 sim_gate, ect_gate, usb_gate, kpp_gate, ipu_gate, uart3_gate,
46 uart4_gate, uart5_gate, owire_gate, ssi2_gate, cspi1_gate, cspi2_gate,
47 gacc_gate, emi_gate, rtic_gate, firi_gate, clk_max
48};
49
50static struct clk *clk[clk_max];
51static struct clk_onecell_data clk_data;
52
53static void __init _mx31_clocks_init(void __iomem *base, unsigned long fref)
54{
55 clk[dummy] = imx_clk_fixed("dummy", 0);
56 clk[ckih] = imx_clk_fixed("ckih", fref);
57 clk[ckil] = imx_clk_fixed("ckil", 32768);
58 clk[mpll] = imx_clk_pllv1(IMX_PLLV1_IMX31, "mpll", "ckih", base + MXC_CCM_MPCTL);
59 clk[spll] = imx_clk_pllv1(IMX_PLLV1_IMX31, "spll", "ckih", base + MXC_CCM_SRPCTL);
60 clk[upll] = imx_clk_pllv1(IMX_PLLV1_IMX31, "upll", "ckih", base + MXC_CCM_UPCTL);
61 clk[mcu_main] = imx_clk_mux("mcu_main", base + MXC_CCM_PMCR0, 31, 1, mcu_main_sel, ARRAY_SIZE(mcu_main_sel));
62 clk[hsp] = imx_clk_divider("hsp", "mcu_main", base + MXC_CCM_PDR0, 11, 3);
63 clk[ahb] = imx_clk_divider("ahb", "mcu_main", base + MXC_CCM_PDR0, 3, 3);
64 clk[nfc] = imx_clk_divider("nfc", "ahb", base + MXC_CCM_PDR0, 8, 3);
65 clk[ipg] = imx_clk_divider("ipg", "ahb", base + MXC_CCM_PDR0, 6, 2);
66 clk[per_div] = imx_clk_divider("per_div", "upll", base + MXC_CCM_PDR0, 16, 5);
67 clk[per] = imx_clk_mux("per", base + MXC_CCM_CCMR, 24, 1, per_sel, ARRAY_SIZE(per_sel));
68 clk[csi] = imx_clk_mux("csi_sel", base + MXC_CCM_CCMR, 25, 1, csi_sel, ARRAY_SIZE(csi_sel));
69 clk[fir] = imx_clk_mux("fir_sel", base + MXC_CCM_CCMR, 11, 2, fir_sel, ARRAY_SIZE(fir_sel));
70 clk[csi_div] = imx_clk_divider("csi_div", "csi_sel", base + MXC_CCM_PDR0, 23, 9);
71 clk[usb_div_pre] = imx_clk_divider("usb_div_pre", "upll", base + MXC_CCM_PDR1, 30, 2);
72 clk[usb_div_post] = imx_clk_divider("usb_div_post", "usb_div_pre", base + MXC_CCM_PDR1, 27, 3);
73 clk[fir_div_pre] = imx_clk_divider("fir_div_pre", "fir_sel", base + MXC_CCM_PDR1, 24, 3);
74 clk[fir_div_post] = imx_clk_divider("fir_div_post", "fir_div_pre", base + MXC_CCM_PDR1, 23, 6);
75 clk[sdhc1_gate] = imx_clk_gate2("sdhc1_gate", "per", base + MXC_CCM_CGR0, 0);
76 clk[sdhc2_gate] = imx_clk_gate2("sdhc2_gate", "per", base + MXC_CCM_CGR0, 2);
77 clk[gpt_gate] = imx_clk_gate2("gpt_gate", "per", base + MXC_CCM_CGR0, 4);
78 clk[epit1_gate] = imx_clk_gate2("epit1_gate", "per", base + MXC_CCM_CGR0, 6);
79 clk[epit2_gate] = imx_clk_gate2("epit2_gate", "per", base + MXC_CCM_CGR0, 8);
80 clk[iim_gate] = imx_clk_gate2("iim_gate", "ipg", base + MXC_CCM_CGR0, 10);
81 clk[ata_gate] = imx_clk_gate2("ata_gate", "ipg", base + MXC_CCM_CGR0, 12);
82 clk[sdma_gate] = imx_clk_gate2("sdma_gate", "ahb", base + MXC_CCM_CGR0, 14);
83 clk[cspi3_gate] = imx_clk_gate2("cspi3_gate", "ipg", base + MXC_CCM_CGR0, 16);
84 clk[rng_gate] = imx_clk_gate2("rng_gate", "ipg", base + MXC_CCM_CGR0, 18);
85 clk[uart1_gate] = imx_clk_gate2("uart1_gate", "per", base + MXC_CCM_CGR0, 20);
86 clk[uart2_gate] = imx_clk_gate2("uart2_gate", "per", base + MXC_CCM_CGR0, 22);
87 clk[ssi1_gate] = imx_clk_gate2("ssi1_gate", "spll", base + MXC_CCM_CGR0, 24);
88 clk[i2c1_gate] = imx_clk_gate2("i2c1_gate", "per", base + MXC_CCM_CGR0, 26);
89 clk[i2c2_gate] = imx_clk_gate2("i2c2_gate", "per", base + MXC_CCM_CGR0, 28);
90 clk[i2c3_gate] = imx_clk_gate2("i2c3_gate", "per", base + MXC_CCM_CGR0, 30);
91 clk[hantro_gate] = imx_clk_gate2("hantro_gate", "per", base + MXC_CCM_CGR1, 0);
92 clk[mstick1_gate] = imx_clk_gate2("mstick1_gate", "per", base + MXC_CCM_CGR1, 2);
93 clk[mstick2_gate] = imx_clk_gate2("mstick2_gate", "per", base + MXC_CCM_CGR1, 4);
94 clk[csi_gate] = imx_clk_gate2("csi_gate", "csi_div", base + MXC_CCM_CGR1, 6);
95 clk[rtc_gate] = imx_clk_gate2("rtc_gate", "ipg", base + MXC_CCM_CGR1, 8);
96 clk[wdog_gate] = imx_clk_gate2("wdog_gate", "ipg", base + MXC_CCM_CGR1, 10);
97 clk[pwm_gate] = imx_clk_gate2("pwm_gate", "per", base + MXC_CCM_CGR1, 12);
98 clk[sim_gate] = imx_clk_gate2("sim_gate", "per", base + MXC_CCM_CGR1, 14);
99 clk[ect_gate] = imx_clk_gate2("ect_gate", "per", base + MXC_CCM_CGR1, 16);
100 clk[usb_gate] = imx_clk_gate2("usb_gate", "ahb", base + MXC_CCM_CGR1, 18);
101 clk[kpp_gate] = imx_clk_gate2("kpp_gate", "ipg", base + MXC_CCM_CGR1, 20);
102 clk[ipu_gate] = imx_clk_gate2("ipu_gate", "hsp", base + MXC_CCM_CGR1, 22);
103 clk[uart3_gate] = imx_clk_gate2("uart3_gate", "per", base + MXC_CCM_CGR1, 24);
104 clk[uart4_gate] = imx_clk_gate2("uart4_gate", "per", base + MXC_CCM_CGR1, 26);
105 clk[uart5_gate] = imx_clk_gate2("uart5_gate", "per", base + MXC_CCM_CGR1, 28);
106 clk[owire_gate] = imx_clk_gate2("owire_gate", "per", base + MXC_CCM_CGR1, 30);
107 clk[ssi2_gate] = imx_clk_gate2("ssi2_gate", "spll", base + MXC_CCM_CGR2, 0);
108 clk[cspi1_gate] = imx_clk_gate2("cspi1_gate", "ipg", base + MXC_CCM_CGR2, 2);
109 clk[cspi2_gate] = imx_clk_gate2("cspi2_gate", "ipg", base + MXC_CCM_CGR2, 4);
110 clk[gacc_gate] = imx_clk_gate2("gacc_gate", "per", base + MXC_CCM_CGR2, 6);
111 clk[emi_gate] = imx_clk_gate2("emi_gate", "ahb", base + MXC_CCM_CGR2, 8);
112 clk[rtic_gate] = imx_clk_gate2("rtic_gate", "ahb", base + MXC_CCM_CGR2, 10);
113 clk[firi_gate] = imx_clk_gate2("firi_gate", "upll", base+MXC_CCM_CGR2, 12);
114
115 imx_check_clocks(clks: clk, ARRAY_SIZE(clk));
116
117 clk_set_parent(clk: clk[csi], parent: clk[upll]);
118 clk_prepare_enable(clk: clk[emi_gate]);
119 clk_prepare_enable(clk: clk[iim_gate]);
120 mx31_revision();
121 clk_disable_unprepare(clk: clk[iim_gate]);
122}
123
124static void __init mx31_clocks_init_dt(struct device_node *np)
125{
126 struct device_node *osc_np;
127 u32 fref = 26000000; /* default */
128 void __iomem *ccm;
129
130 for_each_compatible_node(osc_np, NULL, "fixed-clock") {
131 if (!of_device_is_compatible(device: osc_np, "fsl,imx-osc26m"))
132 continue;
133
134 if (!of_property_read_u32(np: osc_np, propname: "clock-frequency", out_value: &fref)) {
135 of_node_put(node: osc_np);
136 break;
137 }
138 }
139
140 ccm = of_iomap(node: np, index: 0);
141 if (!ccm)
142 panic(fmt: "%s: failed to map registers\n", __func__);
143
144 _mx31_clocks_init(base: ccm, fref);
145
146 clk_data.clks = clk;
147 clk_data.clk_num = ARRAY_SIZE(clk);
148 of_clk_add_provider(np, clk_src_get: of_clk_src_onecell_get, data: &clk_data);
149}
150
151CLK_OF_DECLARE(imx31_ccm, "fsl,imx31-ccm", mx31_clocks_init_dt);
152

source code of linux/drivers/clk/imx/clk-imx31.c