drivers/clk/versatile/clk-impd1.c

   1 /*
   2  * Clock driver for the ARM Integrator/IM-PD1 board
   3  * Copyright (C) 2012-2013 Linus Walleij
   4  *
   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.
   8  */
   9 #include <linux/clk-provider.h>
  10 #include <linux/clk.h>
  11 #include <linux/clkdev.h>
  12 #include <linux/err.h>
  13 #include <linux/io.h>
  14 #include <linux/platform_data/clk-integrator.h>
  15
  16 #include "clk-icst.h"
  17
  18 #define IMPD1_OSC1      0x00
  19 #define IMPD1_OSC2      0x04
  20 #define IMPD1_LOCK      0x08
  21
  22 struct impd1_clk {
  23         char *pclkname;
  24         struct clk *pclk;
  25         char *vco1name;
  26         struct clk *vco1clk;
  27         char *vco2name;
  28         struct clk *vco2clk;
  29         struct clk *mmciclk;
  30         char *uartname;
  31         struct clk *uartclk;
  32         char *spiname;
  33         struct clk *spiclk;
  34         char *scname;
  35         struct clk *scclk;
  36         struct clk_lookup *clks[15];
  37 };
  38
  39 /* One entry for each connected IM-PD1 LM */
  40 static struct impd1_clk impd1_clks[4];
  41
  42 /*
  43  * There are two VCO's on the IM-PD1
  44  */
  45
  46 static const struct icst_params impd1_vco1_params = {
  47         .ref            = 24000000,     /* 24 MHz */
  48         .vco_max        = ICST525_VCO_MAX_3V,
  49         .vco_min        = ICST525_VCO_MIN,
  50         .vd_min         = 12,
  51         .vd_max         = 519,
  52         .rd_min         = 3,
  53         .rd_max         = 120,
  54         .s2div          = icst525_s2div,
  55         .idx2s          = icst525_idx2s,
  56 };
  57
  58 static const struct clk_icst_desc impd1_icst1_desc = {
  59         .params = &impd1_vco1_params,
  60         .vco_offset = IMPD1_OSC1,
  61         .lock_offset = IMPD1_LOCK,
  62 };
  63
  64 static const struct icst_params impd1_vco2_params = {
  65         .ref            = 24000000,     /* 24 MHz */
  66         .vco_max        = ICST525_VCO_MAX_3V,
  67         .vco_min        = ICST525_VCO_MIN,
  68         .vd_min         = 12,
  69         .vd_max         = 519,
  70         .rd_min         = 3,
  71         .rd_max         = 120,
  72         .s2div          = icst525_s2div,
  73         .idx2s          = icst525_idx2s,
  74 };
  75
  76 static const struct clk_icst_desc impd1_icst2_desc = {
  77         .params = &impd1_vco2_params,
  78         .vco_offset = IMPD1_OSC2,
  79         .lock_offset = IMPD1_LOCK,
  80 };
  81
  82 /**
  83  * integrator_impd1_clk_init() - set up the integrator clock tree
  84  * @base: base address of the logic module (LM)
  85  * @id: the ID of this LM
  86  */
  87 void integrator_impd1_clk_init(void __iomem *base, unsigned int id)
  88 {
  89         struct impd1_clk *imc;
  90         struct clk *clk;
  91         struct clk *pclk;
  92         int i;
  93
  94         if (id > 3) {
  95                 pr_crit("no more than 4 LMs can be attached\n");
  96                 return;
  97         }
  98         imc = &impd1_clks[id];
  99
 100         /* Register the fixed rate PCLK */
 101         imc->pclkname = kasprintf(GFP_KERNEL, "lm%x-pclk", id);
 102         pclk = clk_register_fixed_rate(NULL, imc->pclkname, NULL,
 103                                       CLK_IS_ROOT, 0);
 104         imc->pclk = pclk;
 105
 106         imc->vco1name = kasprintf(GFP_KERNEL, "lm%x-vco1", id);
 107         clk = icst_clk_register(NULL, &impd1_icst1_desc, imc->vco1name, NULL,
 108                                 base);
 109         imc->vco1clk = clk;
 110         imc->clks[0] = clkdev_alloc(pclk, "apb_pclk", "lm%x:01000", id);
 111         imc->clks[1] = clkdev_alloc(clk, NULL, "lm%x:01000", id);
 112
 113         /* VCO2 is also called "CLK2" */
 114         imc->vco2name = kasprintf(GFP_KERNEL, "lm%x-vco2", id);
 115         clk = icst_clk_register(NULL, &impd1_icst2_desc, imc->vco2name, NULL,
 116                                 base);
 117         imc->vco2clk = clk;
 118
 119         /* MMCI uses CLK2 right off */
 120         imc->clks[2] = clkdev_alloc(pclk, "apb_pclk", "lm%x:00700", id);
 121         imc->clks[3] = clkdev_alloc(clk, NULL, "lm%x:00700", id);
 122
 123         /* UART reference clock divides CLK2 by a fixed factor 4 */
 124         imc->uartname = kasprintf(GFP_KERNEL, "lm%x-uartclk", id);
 125         clk = clk_register_fixed_factor(NULL, imc->uartname, imc->vco2name,
 126                                    CLK_IGNORE_UNUSED, 1, 4);
 127         imc->uartclk = clk;
 128         imc->clks[4] = clkdev_alloc(pclk, "apb_pclk", "lm%x:00100", id);
 129         imc->clks[5] = clkdev_alloc(clk, NULL, "lm%x:00100", id);
 130         imc->clks[6] = clkdev_alloc(pclk, "apb_pclk", "lm%x:00200", id);
 131         imc->clks[7] = clkdev_alloc(clk, NULL, "lm%x:00200", id);
 132
 133         /* SPI PL022 clock divides CLK2 by a fixed factor 64 */
 134         imc->spiname = kasprintf(GFP_KERNEL, "lm%x-spiclk", id);
 135         clk = clk_register_fixed_factor(NULL, imc->spiname, imc->vco2name,
 136                                    CLK_IGNORE_UNUSED, 1, 64);
 137         imc->clks[8] = clkdev_alloc(pclk, "apb_pclk", "lm%x:00300", id);
 138         imc->clks[9] = clkdev_alloc(clk, NULL, "lm%x:00300", id);
 139
 140         /* The GPIO blocks and AACI have only PCLK */
 141         imc->clks[10] = clkdev_alloc(pclk, "apb_pclk", "lm%x:00400", id);
 142         imc->clks[11] = clkdev_alloc(pclk, "apb_pclk", "lm%x:00500", id);
 143         imc->clks[12] = clkdev_alloc(pclk, "apb_pclk", "lm%x:00800", id);
 144
 145         /* Smart Card clock divides CLK2 by a fixed factor 4 */
 146         imc->scname = kasprintf(GFP_KERNEL, "lm%x-scclk", id);
 147         clk = clk_register_fixed_factor(NULL, imc->scname, imc->vco2name,
 148                                    CLK_IGNORE_UNUSED, 1, 4);
 149         imc->scclk = clk;
 150         imc->clks[13] = clkdev_alloc(pclk, "apb_pclk", "lm%x:00600", id);
 151         imc->clks[14] = clkdev_alloc(clk, NULL, "lm%x:00600", id);
 152
 153         for (i = 0; i < ARRAY_SIZE(imc->clks); i++)
 154                 clkdev_add(imc->clks[i]);
 155 }
 156 EXPORT_SYMBOL_GPL(integrator_impd1_clk_init);
 157
 158 void integrator_impd1_clk_exit(unsigned int id)
 159 {
 160         int i;
 161         struct impd1_clk *imc;
 162
 163         if (id > 3)
 164                 return;
 165         imc = &impd1_clks[id];
 166
 167         for (i = 0; i < ARRAY_SIZE(imc->clks); i++)
 168                 clkdev_drop(imc->clks[i]);
 169         clk_unregister(imc->spiclk);
 170         clk_unregister(imc->uartclk);
 171         clk_unregister(imc->vco2clk);
 172         clk_unregister(imc->vco1clk);
 173         clk_unregister(imc->pclk);
 174         kfree(imc->scname);
 175         kfree(imc->spiname);
 176         kfree(imc->uartname);
 177         kfree(imc->vco2name);
 178         kfree(imc->vco1name);
 179         kfree(imc->pclkname);
 180 }
 181 EXPORT_SYMBOL_GPL(integrator_impd1_clk_exit);