drivers/clk/versatile/clk-impd1.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Clock driver for the ARM Integrator/IM-PD1 board
   4  * Copyright (C) 2012-2013 Linus Walleij
   5  */
   6 #include <linux/clk-provider.h>
   7 #include <linux/clkdev.h>
   8 #include <linux/err.h>
   9 #include <linux/io.h>
  10 #include <linux/platform_data/clk-integrator.h>
  11
  12 #include "icst.h"
  13 #include "clk-icst.h"
  14
  15 #define IMPD1_OSC1      0x00
  16 #define IMPD1_OSC2      0x04
  17 #define IMPD1_LOCK      0x08
  18
  19 struct impd1_clk {
  20         char *pclkname;
  21         struct clk *pclk;
  22         char *vco1name;
  23         struct clk *vco1clk;
  24         char *vco2name;
  25         struct clk *vco2clk;
  26         struct clk *mmciclk;
  27         char *uartname;
  28         struct clk *uartclk;
  29         char *spiname;
  30         struct clk *spiclk;
  31         char *scname;
  32         struct clk *scclk;
  33         struct clk_lookup *clks[15];
  34 };
  35
  36 /* One entry for each connected IM-PD1 LM */
  37 static struct impd1_clk impd1_clks[4];
  38
  39 /*
  40  * There are two VCO's on the IM-PD1
  41  */
  42
  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,
  47         .vd_min         = 12,
  48         .vd_max         = 519,
  49         .rd_min         = 3,
  50         .rd_max         = 120,
  51         .s2div          = icst525_s2div,
  52         .idx2s          = icst525_idx2s,
  53 };
  54
  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,
  59 };
  60
  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,
  65         .vd_min         = 12,
  66         .vd_max         = 519,
  67         .rd_min         = 3,
  68         .rd_max         = 120,
  69         .s2div          = icst525_s2div,
  70         .idx2s          = icst525_idx2s,
  71 };
  72
  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,
  77 };
  78
  79 /**
  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
  83  */
  84 void integrator_impd1_clk_init(void __iomem *base, unsigned int id)
  85 {
  86         struct impd1_clk *imc;
  87         struct clk *clk;
  88         struct clk *pclk;
  89         int i;
  90
  91         if (id > 3) {
  92                 pr_crit("no more than 4 LMs can be attached\n");
  93                 return;
  94         }
  95         imc = &impd1_clks[id];
  96
  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);
 100         imc->pclk = pclk;
 101
 102         imc->vco1name = kasprintf(GFP_KERNEL, "lm%x-vco1", id);
 103         clk = icst_clk_register(NULL, &impd1_icst1_desc, imc->vco1name, NULL,
 104                                 base);
 105         imc->vco1clk = clk;
 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);
 108
 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,
 112                                 base);
 113         imc->vco2clk = clk;
 114
 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);
 118
 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);
 123         imc->uartclk = clk;
 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);
 128
 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);
 135
 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);
 140
 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);
 145         imc->scclk = clk;
 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);
 148
 149         for (i = 0; i < ARRAY_SIZE(imc->clks); i++)
 150                 clkdev_add(imc->clks[i]);
 151 }
 152 EXPORT_SYMBOL_GPL(integrator_impd1_clk_init);
 153
 154 void integrator_impd1_clk_exit(unsigned int id)
 155 {
 156         int i;
 157         struct impd1_clk *imc;
 158
 159         if (id > 3)
 160                 return;
 161         imc = &impd1_clks[id];
 162
 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);
 170         kfree(imc->scname);
 171         kfree(imc->spiname);
 172         kfree(imc->uartname);
 173         kfree(imc->vco2name);
 174         kfree(imc->vco1name);
 175         kfree(imc->pclkname);
 176 }
 177 EXPORT_SYMBOL_GPL(integrator_impd1_clk_exit);