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