drivers/interconnect/qcom/osm-l3.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (c) 2020, The Linux Foundation. All rights reserved.
   4  */
   5
   6 #include <linux/bitfield.h>
   7 #include <linux/clk.h>
   8 #include <linux/interconnect-provider.h>
   9 #include <linux/io.h>
  10 #include <linux/kernel.h>
  11 #include <linux/module.h>
  12 #include <linux/of_device.h>
  13 #include <linux/platform_device.h>
  14
  15 #include <dt-bindings/interconnect/qcom,osm-l3.h>
  16
  17 #include "sc7180.h"
  18 #include "sdm845.h"
  19 #include "sm8150.h"
  20 #include "sm8250.h"
  21
  22 #define LUT_MAX_ENTRIES                 40U
  23 #define LUT_SRC                         GENMASK(31, 30)
  24 #define LUT_L_VAL                       GENMASK(7, 0)
  25 #define CLK_HW_DIV                      2
  26
  27 /* OSM Register offsets */
  28 #define REG_ENABLE                      0x0
  29 #define OSM_LUT_ROW_SIZE                32
  30 #define OSM_REG_FREQ_LUT                0x110
  31 #define OSM_REG_PERF_STATE              0x920
  32
  33 /* EPSS Register offsets */
  34 #define EPSS_LUT_ROW_SIZE               4
  35 #define EPSS_REG_FREQ_LUT               0x100
  36 #define EPSS_REG_PERF_STATE             0x320
  37
  38 #define OSM_L3_MAX_LINKS                1
  39
  40 #define to_qcom_provider(_provider) \
  41         container_of(_provider, struct qcom_osm_l3_icc_provider, provider)
  42
  43 struct qcom_osm_l3_icc_provider {
  44         void __iomem *base;
  45         unsigned int max_state;
  46         unsigned int reg_perf_state;
  47         unsigned long lut_tables[LUT_MAX_ENTRIES];
  48         struct icc_provider provider;
  49 };
  50
  51 /**
  52  * struct qcom_icc_node - Qualcomm specific interconnect nodes
  53  * @name: the node name used in debugfs
  54  * @links: an array of nodes where we can go next while traversing
  55  * @id: a unique node identifier
  56  * @num_links: the total number of @links
  57  * @buswidth: width of the interconnect between a node and the bus
  58  */
  59 struct qcom_icc_node {
  60         const char *name;
  61         u16 links[OSM_L3_MAX_LINKS];
  62         u16 id;
  63         u16 num_links;
  64         u16 buswidth;
  65 };
  66
  67 struct qcom_icc_desc {
  68         const struct qcom_icc_node **nodes;
  69         size_t num_nodes;
  70         unsigned int lut_row_size;
  71         unsigned int reg_freq_lut;
  72         unsigned int reg_perf_state;
  73 };
  74
  75 #define DEFINE_QNODE(_name, _id, _buswidth, ...)                        \
  76         static const struct qcom_icc_node _name = {                     \
  77                 .name = #_name,                                         \
  78                 .id = _id,                                              \
  79                 .buswidth = _buswidth,                                  \
  80                 .num_links = ARRAY_SIZE(((int[]){ __VA_ARGS__ })),      \
  81                 .links = { __VA_ARGS__ },                               \
  82         }
  83
  84 DEFINE_QNODE(sdm845_osm_apps_l3, SDM845_MASTER_OSM_L3_APPS, 16, SDM845_SLAVE_OSM_L3);
  85 DEFINE_QNODE(sdm845_osm_l3, SDM845_SLAVE_OSM_L3, 16);
  86
  87 static const struct qcom_icc_node *sdm845_osm_l3_nodes[] = {
  88         [MASTER_OSM_L3_APPS] = &sdm845_osm_apps_l3,
  89         [SLAVE_OSM_L3] = &sdm845_osm_l3,
  90 };
  91
  92 static const struct qcom_icc_desc sdm845_icc_osm_l3 = {
  93         .nodes = sdm845_osm_l3_nodes,
  94         .num_nodes = ARRAY_SIZE(sdm845_osm_l3_nodes),
  95         .lut_row_size = OSM_LUT_ROW_SIZE,
  96         .reg_freq_lut = OSM_REG_FREQ_LUT,
  97         .reg_perf_state = OSM_REG_PERF_STATE,
  98 };
  99
 100 DEFINE_QNODE(sc7180_osm_apps_l3, SC7180_MASTER_OSM_L3_APPS, 16, SC7180_SLAVE_OSM_L3);
 101 DEFINE_QNODE(sc7180_osm_l3, SC7180_SLAVE_OSM_L3, 16);
 102
 103 static const struct qcom_icc_node *sc7180_osm_l3_nodes[] = {
 104         [MASTER_OSM_L3_APPS] = &sc7180_osm_apps_l3,
 105         [SLAVE_OSM_L3] = &sc7180_osm_l3,
 106 };
 107
 108 static const struct qcom_icc_desc sc7180_icc_osm_l3 = {
 109         .nodes = sc7180_osm_l3_nodes,
 110         .num_nodes = ARRAY_SIZE(sc7180_osm_l3_nodes),
 111         .lut_row_size = OSM_LUT_ROW_SIZE,
 112         .reg_freq_lut = OSM_REG_FREQ_LUT,
 113         .reg_perf_state = OSM_REG_PERF_STATE,
 114 };
 115
 116 DEFINE_QNODE(sm8150_osm_apps_l3, SM8150_MASTER_OSM_L3_APPS, 32, SM8150_SLAVE_OSM_L3);
 117 DEFINE_QNODE(sm8150_osm_l3, SM8150_SLAVE_OSM_L3, 32);
 118
 119 static const struct qcom_icc_node *sm8150_osm_l3_nodes[] = {
 120         [MASTER_OSM_L3_APPS] = &sm8150_osm_apps_l3,
 121         [SLAVE_OSM_L3] = &sm8150_osm_l3,
 122 };
 123
 124 static const struct qcom_icc_desc sm8150_icc_osm_l3 = {
 125         .nodes = sm8150_osm_l3_nodes,
 126         .num_nodes = ARRAY_SIZE(sm8150_osm_l3_nodes),
 127         .lut_row_size = OSM_LUT_ROW_SIZE,
 128         .reg_freq_lut = OSM_REG_FREQ_LUT,
 129         .reg_perf_state = OSM_REG_PERF_STATE,
 130 };
 131
 132 DEFINE_QNODE(sm8250_epss_apps_l3, SM8250_MASTER_EPSS_L3_APPS, 32, SM8250_SLAVE_EPSS_L3);
 133 DEFINE_QNODE(sm8250_epss_l3, SM8250_SLAVE_EPSS_L3, 32);
 134
 135 static const struct qcom_icc_node *sm8250_epss_l3_nodes[] = {
 136         [MASTER_EPSS_L3_APPS] = &sm8250_epss_apps_l3,
 137         [SLAVE_EPSS_L3_SHARED] = &sm8250_epss_l3,
 138 };
 139
 140 static const struct qcom_icc_desc sm8250_icc_epss_l3 = {
 141         .nodes = sm8250_epss_l3_nodes,
 142         .num_nodes = ARRAY_SIZE(sm8250_epss_l3_nodes),
 143         .lut_row_size = EPSS_LUT_ROW_SIZE,
 144         .reg_freq_lut = EPSS_REG_FREQ_LUT,
 145         .reg_perf_state = EPSS_REG_PERF_STATE,
 146 };
 147
 148 static int qcom_icc_set(struct icc_node *src, struct icc_node *dst)
 149 {
 150         struct qcom_osm_l3_icc_provider *qp;
 151         struct icc_provider *provider;
 152         const struct qcom_icc_node *qn;
 153         struct icc_node *n;
 154         unsigned int index;
 155         u32 agg_peak = 0;
 156         u32 agg_avg = 0;
 157         u64 rate;
 158
 159         qn = src->data;
 160         provider = src->provider;
 161         qp = to_qcom_provider(provider);
 162
 163         list_for_each_entry(n, &provider->nodes, node_list)
 164                 provider->aggregate(n, 0, n->avg_bw, n->peak_bw,
 165                                     &agg_avg, &agg_peak);
 166
 167         rate = max(agg_avg, agg_peak);
 168         rate = icc_units_to_bps(rate);
 169         do_div(rate, qn->buswidth);
 170
 171         for (index = 0; index < qp->max_state - 1; index++) {
 172                 if (qp->lut_tables[index] >= rate)
 173                         break;
 174         }
 175
 176         writel_relaxed(index, qp->base + qp->reg_perf_state);
 177
 178         return 0;
 179 }
 180
 181 static int qcom_osm_l3_remove(struct platform_device *pdev)
 182 {
 183         struct qcom_osm_l3_icc_provider *qp = platform_get_drvdata(pdev);
 184
 185         icc_nodes_remove(&qp->provider);
 186         return icc_provider_del(&qp->provider);
 187 }
 188
 189 static int qcom_osm_l3_probe(struct platform_device *pdev)
 190 {
 191         u32 info, src, lval, i, prev_freq = 0, freq;
 192         static unsigned long hw_rate, xo_rate;
 193         struct qcom_osm_l3_icc_provider *qp;
 194         const struct qcom_icc_desc *desc;
 195         struct icc_onecell_data *data;
 196         struct icc_provider *provider;
 197         const struct qcom_icc_node **qnodes;
 198         struct icc_node *node;
 199         size_t num_nodes;
 200         struct clk *clk;
 201         int ret;
 202
 203         clk = clk_get(&pdev->dev, "xo");
 204         if (IS_ERR(clk))
 205                 return PTR_ERR(clk);
 206
 207         xo_rate = clk_get_rate(clk);
 208         clk_put(clk);
 209
 210         clk = clk_get(&pdev->dev, "alternate");
 211         if (IS_ERR(clk))
 212                 return PTR_ERR(clk);
 213
 214         hw_rate = clk_get_rate(clk) / CLK_HW_DIV;
 215         clk_put(clk);
 216
 217         qp = devm_kzalloc(&pdev->dev, sizeof(*qp), GFP_KERNEL);
 218         if (!qp)
 219                 return -ENOMEM;
 220
 221         qp->base = devm_platform_ioremap_resource(pdev, 0);
 222         if (IS_ERR(qp->base))
 223                 return PTR_ERR(qp->base);
 224
 225         /* HW should be in enabled state to proceed */
 226         if (!(readl_relaxed(qp->base + REG_ENABLE) & 0x1)) {
 227                 dev_err(&pdev->dev, "error hardware not enabled\n");
 228                 return -ENODEV;
 229         }
 230
 231         desc = device_get_match_data(&pdev->dev);
 232         if (!desc)
 233                 return -EINVAL;
 234
 235         qp->reg_perf_state = desc->reg_perf_state;
 236
 237         for (i = 0; i < LUT_MAX_ENTRIES; i++) {
 238                 info = readl_relaxed(qp->base + desc->reg_freq_lut +
 239                                      i * desc->lut_row_size);
 240                 src = FIELD_GET(LUT_SRC, info);
 241                 lval = FIELD_GET(LUT_L_VAL, info);
 242                 if (src)
 243                         freq = xo_rate * lval;
 244                 else
 245                         freq = hw_rate;
 246
 247                 /* Two of the same frequencies signify end of table */
 248                 if (i > 0 && prev_freq == freq)
 249                         break;
 250
 251                 dev_dbg(&pdev->dev, "index=%d freq=%d\n", i, freq);
 252
 253                 qp->lut_tables[i] = freq;
 254                 prev_freq = freq;
 255         }
 256         qp->max_state = i;
 257
 258         qnodes = desc->nodes;
 259         num_nodes = desc->num_nodes;
 260
 261         data = devm_kcalloc(&pdev->dev, num_nodes, sizeof(*node), GFP_KERNEL);
 262         if (!data)
 263                 return -ENOMEM;
 264
 265         provider = &qp->provider;
 266         provider->dev = &pdev->dev;
 267         provider->set = qcom_icc_set;
 268         provider->aggregate = icc_std_aggregate;
 269         provider->xlate = of_icc_xlate_onecell;
 270         INIT_LIST_HEAD(&provider->nodes);
 271         provider->data = data;
 272
 273         ret = icc_provider_add(provider);
 274         if (ret) {
 275                 dev_err(&pdev->dev, "error adding interconnect provider\n");
 276                 return ret;
 277         }
 278
 279         for (i = 0; i < num_nodes; i++) {
 280                 size_t j;
 281
 282                 node = icc_node_create(qnodes[i]->id);
 283                 if (IS_ERR(node)) {
 284                         ret = PTR_ERR(node);
 285                         goto err;
 286                 }
 287
 288                 node->name = qnodes[i]->name;
 289                 /* Cast away const and add it back in qcom_icc_set() */
 290                 node->data = (void *)qnodes[i];
 291                 icc_node_add(node, provider);
 292
 293                 for (j = 0; j < qnodes[i]->num_links; j++)
 294                         icc_link_create(node, qnodes[i]->links[j]);
 295
 296                 data->nodes[i] = node;
 297         }
 298         data->num_nodes = num_nodes;
 299
 300         platform_set_drvdata(pdev, qp);
 301
 302         return 0;
 303 err:
 304         icc_nodes_remove(provider);
 305         icc_provider_del(provider);
 306
 307         return ret;
 308 }
 309
 310 static const struct of_device_id osm_l3_of_match[] = {
 311         { .compatible = "qcom,sc7180-osm-l3", .data = &sc7180_icc_osm_l3 },
 312         { .compatible = "qcom,sdm845-osm-l3", .data = &sdm845_icc_osm_l3 },
 313         { .compatible = "qcom,sm8150-osm-l3", .data = &sm8150_icc_osm_l3 },
 314         { .compatible = "qcom,sm8250-epss-l3", .data = &sm8250_icc_epss_l3 },
 315         { }
 316 };
 317 MODULE_DEVICE_TABLE(of, osm_l3_of_match);
 318
 319 static struct platform_driver osm_l3_driver = {
 320         .probe = qcom_osm_l3_probe,
 321         .remove = qcom_osm_l3_remove,
 322         .driver = {
 323                 .name = "osm-l3",
 324                 .of_match_table = osm_l3_of_match,
 325                 .sync_state = icc_sync_state,
 326         },
 327 };
 328 module_platform_driver(osm_l3_driver);
 329
 330 MODULE_DESCRIPTION("Qualcomm OSM L3 interconnect driver");
 331 MODULE_LICENSE("GPL v2");