1 // SPDX-License-Identifier: GPL-2.0-only
3 * Clock driver for the ARM Integrator/IM-PD1 board
4 * Copyright (C) 2012-2013 Linus Walleij
6 #include <linux/clk-provider.h>
7 #include <linux/clkdev.h>
10 #include <linux/platform_data/clk-integrator.h>
15 #define IMPD1_OSC1 0x00
16 #define IMPD1_OSC2 0x04
17 #define IMPD1_LOCK 0x08
33 struct clk_lookup *clks[15];
36 /* One entry for each connected IM-PD1 LM */
37 static struct impd1_clk impd1_clks[4];
40 * There are two VCO's on the IM-PD1
43 static const struct icst_params impd1_vco1_params = {
44 .ref = 24000000, /* 24 MHz */
45 .vco_max = ICST525_VCO_MAX_3V,
46 .vco_min = ICST525_VCO_MIN,
51 .s2div = icst525_s2div,
52 .idx2s = icst525_idx2s,
55 static const struct clk_icst_desc impd1_icst1_desc = {
56 .params = &impd1_vco1_params,
57 .vco_offset = IMPD1_OSC1,
58 .lock_offset = IMPD1_LOCK,
61 static const struct icst_params impd1_vco2_params = {
62 .ref = 24000000, /* 24 MHz */
63 .vco_max = ICST525_VCO_MAX_3V,
64 .vco_min = ICST525_VCO_MIN,
69 .s2div = icst525_s2div,
70 .idx2s = icst525_idx2s,
73 static const struct clk_icst_desc impd1_icst2_desc = {
74 .params = &impd1_vco2_params,
75 .vco_offset = IMPD1_OSC2,
76 .lock_offset = IMPD1_LOCK,
80 * integrator_impd1_clk_init() - set up the integrator clock tree
81 * @base: base address of the logic module (LM)
82 * @id: the ID of this LM
84 void integrator_impd1_clk_init(void __iomem *base, unsigned int id)
86 struct impd1_clk *imc;
92 pr_crit("no more than 4 LMs can be attached\n");
95 imc = &impd1_clks[id];
97 /* Register the fixed rate PCLK */
98 imc->pclkname = kasprintf(GFP_KERNEL, "lm%x-pclk", id);
99 pclk = clk_register_fixed_rate(NULL, imc->pclkname, NULL, 0, 0);
102 imc->vco1name = kasprintf(GFP_KERNEL, "lm%x-vco1", id);
103 clk = icst_clk_register(NULL, &impd1_icst1_desc, imc->vco1name, NULL,
106 imc->clks[0] = clkdev_alloc(pclk, "apb_pclk", "lm%x:01000", id);
107 imc->clks[1] = clkdev_alloc(clk, NULL, "lm%x:01000", id);
109 /* VCO2 is also called "CLK2" */
110 imc->vco2name = kasprintf(GFP_KERNEL, "lm%x-vco2", id);
111 clk = icst_clk_register(NULL, &impd1_icst2_desc, imc->vco2name, NULL,
115 /* MMCI uses CLK2 right off */
116 imc->clks[2] = clkdev_alloc(pclk, "apb_pclk", "lm%x:00700", id);
117 imc->clks[3] = clkdev_alloc(clk, NULL, "lm%x:00700", id);
119 /* UART reference clock divides CLK2 by a fixed factor 4 */
120 imc->uartname = kasprintf(GFP_KERNEL, "lm%x-uartclk", id);
121 clk = clk_register_fixed_factor(NULL, imc->uartname, imc->vco2name,
122 CLK_IGNORE_UNUSED, 1, 4);
124 imc->clks[4] = clkdev_alloc(pclk, "apb_pclk", "lm%x:00100", id);
125 imc->clks[5] = clkdev_alloc(clk, NULL, "lm%x:00100", id);
126 imc->clks[6] = clkdev_alloc(pclk, "apb_pclk", "lm%x:00200", id);
127 imc->clks[7] = clkdev_alloc(clk, NULL, "lm%x:00200", id);
129 /* SPI PL022 clock divides CLK2 by a fixed factor 64 */
130 imc->spiname = kasprintf(GFP_KERNEL, "lm%x-spiclk", id);
131 clk = clk_register_fixed_factor(NULL, imc->spiname, imc->vco2name,
132 CLK_IGNORE_UNUSED, 1, 64);
133 imc->clks[8] = clkdev_alloc(pclk, "apb_pclk", "lm%x:00300", id);
134 imc->clks[9] = clkdev_alloc(clk, NULL, "lm%x:00300", id);
136 /* The GPIO blocks and AACI have only PCLK */
137 imc->clks[10] = clkdev_alloc(pclk, "apb_pclk", "lm%x:00400", id);
138 imc->clks[11] = clkdev_alloc(pclk, "apb_pclk", "lm%x:00500", id);
139 imc->clks[12] = clkdev_alloc(pclk, "apb_pclk", "lm%x:00800", id);
141 /* Smart Card clock divides CLK2 by a fixed factor 4 */
142 imc->scname = kasprintf(GFP_KERNEL, "lm%x-scclk", id);
143 clk = clk_register_fixed_factor(NULL, imc->scname, imc->vco2name,
144 CLK_IGNORE_UNUSED, 1, 4);
146 imc->clks[13] = clkdev_alloc(pclk, "apb_pclk", "lm%x:00600", id);
147 imc->clks[14] = clkdev_alloc(clk, NULL, "lm%x:00600", id);
149 for (i = 0; i < ARRAY_SIZE(imc->clks); i++)
150 clkdev_add(imc->clks[i]);
152 EXPORT_SYMBOL_GPL(integrator_impd1_clk_init);
154 void integrator_impd1_clk_exit(unsigned int id)
157 struct impd1_clk *imc;
161 imc = &impd1_clks[id];
163 for (i = 0; i < ARRAY_SIZE(imc->clks); i++)
164 clkdev_drop(imc->clks[i]);
165 clk_unregister(imc->spiclk);
166 clk_unregister(imc->uartclk);
167 clk_unregister(imc->vco2clk);
168 clk_unregister(imc->vco1clk);
169 clk_unregister(imc->pclk);
172 kfree(imc->uartname);
173 kfree(imc->vco2name);
174 kfree(imc->vco1name);
175 kfree(imc->pclkname);
177 EXPORT_SYMBOL_GPL(integrator_impd1_clk_exit);