drivers/clk/ti/clk-dra7-atl.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * DRA7 ATL (Audio Tracking Logic) clock driver
   4  *
   5  * Copyright (C) 2013 Texas Instruments, Inc.
   6  *
   7  * Peter Ujfalusi <peter.ujfalusi@ti.com>
   8  */
   9
  10 #include <linux/init.h>
  11 #include <linux/clk.h>
  12 #include <linux/clk-provider.h>
  13 #include <linux/slab.h>
  14 #include <linux/io.h>
  15 #include <linux/of.h>
  16 #include <linux/of_address.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/pm_runtime.h>
  19 #include <linux/clk/ti.h>
  20
  21 #include "clock.h"
  22
  23 #define DRA7_ATL_INSTANCES      4
  24
  25 #define DRA7_ATL_PPMR_REG(id)           (0x200 + (id * 0x80))
  26 #define DRA7_ATL_BBSR_REG(id)           (0x204 + (id * 0x80))
  27 #define DRA7_ATL_ATLCR_REG(id)          (0x208 + (id * 0x80))
  28 #define DRA7_ATL_SWEN_REG(id)           (0x210 + (id * 0x80))
  29 #define DRA7_ATL_BWSMUX_REG(id)         (0x214 + (id * 0x80))
  30 #define DRA7_ATL_AWSMUX_REG(id)         (0x218 + (id * 0x80))
  31 #define DRA7_ATL_PCLKMUX_REG(id)        (0x21c + (id * 0x80))
  32
  33 #define DRA7_ATL_SWEN                   BIT(0)
  34 #define DRA7_ATL_DIVIDER_MASK           (0x1f)
  35 #define DRA7_ATL_PCLKMUX                BIT(0)
  36 struct dra7_atl_clock_info;
  37
  38 struct dra7_atl_desc {
  39         struct clk *clk;
  40         struct clk_hw hw;
  41         struct dra7_atl_clock_info *cinfo;
  42         int id;
  43
  44         bool probed;            /* the driver for the IP has been loaded */
  45         bool valid;             /* configured */
  46         bool enabled;
  47         u32 bws;                /* Baseband Word Select Mux */
  48         u32 aws;                /* Audio Word Select Mux */
  49         u32 divider;            /* Cached divider value */
  50 };
  51
  52 struct dra7_atl_clock_info {
  53         struct device *dev;
  54         void __iomem *iobase;
  55
  56         struct dra7_atl_desc *cdesc;
  57 };
  58
  59 #define to_atl_desc(_hw)        container_of(_hw, struct dra7_atl_desc, hw)
  60
  61 static inline void atl_write(struct dra7_atl_clock_info *cinfo, u32 reg,
  62                              u32 val)
  63 {
  64         __raw_writel(val, cinfo->iobase + reg);
  65 }
  66
  67 static inline int atl_read(struct dra7_atl_clock_info *cinfo, u32 reg)
  68 {
  69         return __raw_readl(cinfo->iobase + reg);
  70 }
  71
  72 static int atl_clk_enable(struct clk_hw *hw)
  73 {
  74         struct dra7_atl_desc *cdesc = to_atl_desc(hw);
  75
  76         if (!cdesc->probed)
  77                 goto out;
  78
  79         if (unlikely(!cdesc->valid))
  80                 dev_warn(cdesc->cinfo->dev, "atl%d has not been configured\n",
  81                          cdesc->id);
  82         pm_runtime_get_sync(cdesc->cinfo->dev);
  83
  84         atl_write(cdesc->cinfo, DRA7_ATL_ATLCR_REG(cdesc->id),
  85                   cdesc->divider - 1);
  86         atl_write(cdesc->cinfo, DRA7_ATL_SWEN_REG(cdesc->id), DRA7_ATL_SWEN);
  87
  88 out:
  89         cdesc->enabled = true;
  90
  91         return 0;
  92 }
  93
  94 static void atl_clk_disable(struct clk_hw *hw)
  95 {
  96         struct dra7_atl_desc *cdesc = to_atl_desc(hw);
  97
  98         if (!cdesc->probed)
  99                 goto out;
 100
 101         atl_write(cdesc->cinfo, DRA7_ATL_SWEN_REG(cdesc->id), 0);
 102         pm_runtime_put_sync(cdesc->cinfo->dev);
 103
 104 out:
 105         cdesc->enabled = false;
 106 }
 107
 108 static int atl_clk_is_enabled(struct clk_hw *hw)
 109 {
 110         struct dra7_atl_desc *cdesc = to_atl_desc(hw);
 111
 112         return cdesc->enabled;
 113 }
 114
 115 static unsigned long atl_clk_recalc_rate(struct clk_hw *hw,
 116                                          unsigned long parent_rate)
 117 {
 118         struct dra7_atl_desc *cdesc = to_atl_desc(hw);
 119
 120         return parent_rate / cdesc->divider;
 121 }
 122
 123 static long atl_clk_round_rate(struct clk_hw *hw, unsigned long rate,
 124                                unsigned long *parent_rate)
 125 {
 126         unsigned divider;
 127
 128         divider = (*parent_rate + rate / 2) / rate;
 129         if (divider > DRA7_ATL_DIVIDER_MASK + 1)
 130                 divider = DRA7_ATL_DIVIDER_MASK + 1;
 131
 132         return *parent_rate / divider;
 133 }
 134
 135 static int atl_clk_set_rate(struct clk_hw *hw, unsigned long rate,
 136                             unsigned long parent_rate)
 137 {
 138         struct dra7_atl_desc *cdesc;
 139         u32 divider;
 140
 141         if (!hw || !rate)
 142                 return -EINVAL;
 143
 144         cdesc = to_atl_desc(hw);
 145         divider = ((parent_rate + rate / 2) / rate) - 1;
 146         if (divider > DRA7_ATL_DIVIDER_MASK)
 147                 divider = DRA7_ATL_DIVIDER_MASK;
 148
 149         cdesc->divider = divider + 1;
 150
 151         return 0;
 152 }
 153
 154 static const struct clk_ops atl_clk_ops = {
 155         .enable         = atl_clk_enable,
 156         .disable        = atl_clk_disable,
 157         .is_enabled     = atl_clk_is_enabled,
 158         .recalc_rate    = atl_clk_recalc_rate,
 159         .round_rate     = atl_clk_round_rate,
 160         .set_rate       = atl_clk_set_rate,
 161 };
 162
 163 static void __init of_dra7_atl_clock_setup(struct device_node *node)
 164 {
 165         struct dra7_atl_desc *clk_hw = NULL;
 166         struct clk_parent_data pdata = { .index = 0 };
 167         struct clk_init_data init = { NULL };
 168         const char *name;
 169         struct clk *clk;
 170
 171         clk_hw = kzalloc(sizeof(*clk_hw), GFP_KERNEL);
 172         if (!clk_hw) {
 173                 pr_err("%s: could not allocate dra7_atl_desc\n", __func__);
 174                 return;
 175         }
 176
 177         clk_hw->hw.init = &init;
 178         clk_hw->divider = 1;
 179         name = ti_dt_clk_name(node);
 180         init.name = name;
 181         init.ops = &atl_clk_ops;
 182         init.flags = CLK_IGNORE_UNUSED;
 183         init.num_parents = of_clk_get_parent_count(node);
 184
 185         if (init.num_parents != 1) {
 186                 pr_err("%s: atl clock %pOFn must have 1 parent\n", __func__,
 187                        node);
 188                 goto cleanup;
 189         }
 190
 191         init.parent_data = &pdata;
 192         clk = of_ti_clk_register(node, &clk_hw->hw, name);
 193
 194         if (!IS_ERR(clk)) {
 195                 of_clk_add_provider(node, of_clk_src_simple_get, clk);
 196                 return;
 197         }
 198 cleanup:
 199         kfree(clk_hw);
 200 }
 201 CLK_OF_DECLARE(dra7_atl_clock, "ti,dra7-atl-clock", of_dra7_atl_clock_setup);
 202
 203 static int of_dra7_atl_clk_probe(struct platform_device *pdev)
 204 {
 205         struct device_node *node = pdev->dev.of_node;
 206         struct dra7_atl_clock_info *cinfo;
 207         int i;
 208         int ret = 0;
 209
 210         if (!node)
 211                 return -ENODEV;
 212
 213         cinfo = devm_kzalloc(&pdev->dev, sizeof(*cinfo), GFP_KERNEL);
 214         if (!cinfo)
 215                 return -ENOMEM;
 216
 217         cinfo->iobase = of_iomap(node, 0);
 218         cinfo->dev = &pdev->dev;
 219         pm_runtime_enable(cinfo->dev);
 220
 221         pm_runtime_get_sync(cinfo->dev);
 222         atl_write(cinfo, DRA7_ATL_PCLKMUX_REG(0), DRA7_ATL_PCLKMUX);
 223
 224         for (i = 0; i < DRA7_ATL_INSTANCES; i++) {
 225                 struct device_node *cfg_node;
 226                 char prop[5];
 227                 struct dra7_atl_desc *cdesc;
 228                 struct of_phandle_args clkspec;
 229                 struct clk *clk;
 230                 int rc;
 231
 232                 rc = of_parse_phandle_with_args(node, "ti,provided-clocks",
 233                                                 NULL, i, &clkspec);
 234
 235                 if (rc) {
 236                         pr_err("%s: failed to lookup atl clock %d\n", __func__,
 237                                i);
 238                         ret = -EINVAL;
 239                         goto pm_put;
 240                 }
 241
 242                 clk = of_clk_get_from_provider(&clkspec);
 243                 if (IS_ERR(clk)) {
 244                         pr_err("%s: failed to get atl clock %d from provider\n",
 245                                __func__, i);
 246                         ret = PTR_ERR(clk);
 247                         goto pm_put;
 248                 }
 249
 250                 cdesc = to_atl_desc(__clk_get_hw(clk));
 251                 cdesc->cinfo = cinfo;
 252                 cdesc->id = i;
 253
 254                 /* Get configuration for the ATL instances */
 255                 snprintf(prop, sizeof(prop), "atl%u", i);
 256                 cfg_node = of_get_child_by_name(node, prop);
 257                 if (cfg_node) {
 258                         ret = of_property_read_u32(cfg_node, "bws",
 259                                                    &cdesc->bws);
 260                         ret |= of_property_read_u32(cfg_node, "aws",
 261                                                     &cdesc->aws);
 262                         if (!ret) {
 263                                 cdesc->valid = true;
 264                                 atl_write(cinfo, DRA7_ATL_BWSMUX_REG(i),
 265                                           cdesc->bws);
 266                                 atl_write(cinfo, DRA7_ATL_AWSMUX_REG(i),
 267                                           cdesc->aws);
 268                         }
 269                         of_node_put(cfg_node);
 270                 }
 271
 272                 cdesc->probed = true;
 273                 /*
 274                  * Enable the clock if it has been asked prior to loading the
 275                  * hw driver
 276                  */
 277                 if (cdesc->enabled)
 278                         atl_clk_enable(__clk_get_hw(clk));
 279         }
 280
 281 pm_put:
 282         pm_runtime_put_sync(cinfo->dev);
 283         return ret;
 284 }
 285
 286 static const struct of_device_id of_dra7_atl_clk_match_tbl[] = {
 287         { .compatible = "ti,dra7-atl", },
 288         {},
 289 };
 290
 291 static struct platform_driver dra7_atl_clk_driver = {
 292         .driver = {
 293                 .name = "dra7-atl",
 294                 .suppress_bind_attrs = true,
 295                 .of_match_table = of_dra7_atl_clk_match_tbl,
 296         },
 297         .probe = of_dra7_atl_clk_probe,
 298 };
 299 builtin_platform_driver(dra7_atl_clk_driver);