2 * Clock driver for the ARM Integrator/IM-PD1 board
3 * Copyright (C) 2012-2013 Linus Walleij
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
9 #include <linux/clk-provider.h>
10 #include <linux/clk.h>
11 #include <linux/clkdev.h>
12 #include <linux/err.h>
14 #include <linux/platform_data/clk-integrator.h>
18 #define IMPD1_OSC1 0x00
19 #define IMPD1_OSC2 0x04
20 #define IMPD1_LOCK 0x08
34 struct clk_lookup *clks[6];
37 /* One entry for each connected IM-PD1 LM */
38 static struct impd1_clk impd1_clks[4];
41 * There are two VCO's on the IM-PD1
44 static const struct icst_params impd1_vco1_params = {
45 .ref = 24000000, /* 24 MHz */
46 .vco_max = ICST525_VCO_MAX_3V,
47 .vco_min = ICST525_VCO_MIN,
52 .s2div = icst525_s2div,
53 .idx2s = icst525_idx2s,
56 static const struct clk_icst_desc impd1_icst1_desc = {
57 .params = &impd1_vco1_params,
58 .vco_offset = IMPD1_OSC1,
59 .lock_offset = IMPD1_LOCK,
62 static const struct icst_params impd1_vco2_params = {
63 .ref = 24000000, /* 24 MHz */
64 .vco_max = ICST525_VCO_MAX_3V,
65 .vco_min = ICST525_VCO_MIN,
70 .s2div = icst525_s2div,
71 .idx2s = icst525_idx2s,
74 static const struct clk_icst_desc impd1_icst2_desc = {
75 .params = &impd1_vco2_params,
76 .vco_offset = IMPD1_OSC2,
77 .lock_offset = IMPD1_LOCK,
81 * integrator_impd1_clk_init() - set up the integrator clock tree
82 * @base: base address of the logic module (LM)
83 * @id: the ID of this LM
85 void integrator_impd1_clk_init(void __iomem *base, unsigned int id)
87 struct impd1_clk *imc;
92 pr_crit("no more than 4 LMs can be attached\n");
95 imc = &impd1_clks[id];
97 imc->vco1name = kasprintf(GFP_KERNEL, "lm%x-vco1", id);
98 clk = icst_clk_register(NULL, &impd1_icst1_desc, imc->vco1name, NULL,
101 imc->clks[0] = clkdev_alloc(clk, NULL, "lm%x:01000", id);
103 /* VCO2 is also called "CLK2" */
104 imc->vco2name = kasprintf(GFP_KERNEL, "lm%x-vco2", id);
105 clk = icst_clk_register(NULL, &impd1_icst2_desc, imc->vco2name, NULL,
109 /* MMCI uses CLK2 right off */
110 imc->clks[1] = clkdev_alloc(clk, NULL, "lm%x:00700", id);
112 /* UART reference clock divides CLK2 by a fixed factor 4 */
113 imc->uartname = kasprintf(GFP_KERNEL, "lm%x-uartclk", id);
114 clk = clk_register_fixed_factor(NULL, imc->uartname, imc->vco2name,
115 CLK_IGNORE_UNUSED, 1, 4);
117 imc->clks[2] = clkdev_alloc(clk, NULL, "lm%x:00100", id);
118 imc->clks[3] = clkdev_alloc(clk, NULL, "lm%x:00200", id);
120 /* SPI PL022 clock divides CLK2 by a fixed factor 64 */
121 imc->spiname = kasprintf(GFP_KERNEL, "lm%x-spiclk", id);
122 clk = clk_register_fixed_factor(NULL, imc->spiname, imc->vco2name,
123 CLK_IGNORE_UNUSED, 1, 64);
124 imc->clks[4] = clkdev_alloc(clk, NULL, "lm%x:00300", id);
126 /* Smart Card clock divides CLK2 by a fixed factor 4 */
127 imc->scname = kasprintf(GFP_KERNEL, "lm%x-scclk", id);
128 clk = clk_register_fixed_factor(NULL, imc->scname, imc->vco2name,
129 CLK_IGNORE_UNUSED, 1, 4);
131 imc->clks[5] = clkdev_alloc(clk, NULL, "lm%x:00600", id);
133 for (i = 0; i < ARRAY_SIZE(imc->clks); i++)
134 clkdev_add(imc->clks[i]);
137 void integrator_impd1_clk_exit(unsigned int id)
140 struct impd1_clk *imc;
144 imc = &impd1_clks[id];
146 for (i = 0; i < ARRAY_SIZE(imc->clks); i++)
147 clkdev_drop(imc->clks[i]);
148 clk_unregister(imc->spiclk);
149 clk_unregister(imc->uartclk);
150 clk_unregister(imc->vco2clk);
151 clk_unregister(imc->vco1clk);
154 kfree(imc->uartname);
155 kfree(imc->vco2name);
156 kfree(imc->vco1name);