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
  20 #define LUT_MAX_ENTRIES                 40U
  21 #define LUT_SRC                         GENMASK(31, 30)
  22 #define LUT_L_VAL                       GENMASK(7, 0)
  23 #define LUT_ROW_SIZE                    32
  24 #define CLK_HW_DIV                      2
  25
  26 /* Register offsets */
  27 #define REG_ENABLE                      0x0
  28 #define REG_FREQ_LUT                    0x110
  29 #define REG_PERF_STATE                  0x920
  30
  31 #define OSM_L3_MAX_LINKS                1
  32
  33 #define to_qcom_provider(_provider) \
  34         container_of(_provider, struct qcom_osm_l3_icc_provider, provider)
  35
  36 struct qcom_osm_l3_icc_provider {
  37         void __iomem *base;
  38         unsigned int max_state;
  39         unsigned long lut_tables[LUT_MAX_ENTRIES];
  40         struct icc_provider provider;
  41 };
  42
  43 /**
  44  * struct qcom_icc_node - Qualcomm specific interconnect nodes
  45  * @name: the node name used in debugfs
  46  * @links: an array of nodes where we can go next while traversing
  47  * @id: a unique node identifier
  48  * @num_links: the total number of @links
  49  * @buswidth: width of the interconnect between a node and the bus
  50  */
  51 struct qcom_icc_node {
  52         const char *name;
  53         u16 links[OSM_L3_MAX_LINKS];
  54         u16 id;
  55         u16 num_links;
  56         u16 buswidth;
  57 };
  58
  59 struct qcom_icc_desc {
  60         struct qcom_icc_node **nodes;
  61         size_t num_nodes;
  62 };
  63
  64 #define DEFINE_QNODE(_name, _id, _buswidth, ...)                        \
  65                 static struct qcom_icc_node _name = {                   \
  66                 .name = #_name,                                         \
  67                 .id = _id,                                              \
  68                 .buswidth = _buswidth,                                  \
  69                 .num_links = ARRAY_SIZE(((int[]){ __VA_ARGS__ })),      \
  70                 .links = { __VA_ARGS__ },                               \
  71         }
  72
  73 DEFINE_QNODE(sdm845_osm_apps_l3, SDM845_MASTER_OSM_L3_APPS, 16, SDM845_SLAVE_OSM_L3);
  74 DEFINE_QNODE(sdm845_osm_l3, SDM845_SLAVE_OSM_L3, 16);
  75
  76 static struct qcom_icc_node *sdm845_osm_l3_nodes[] = {
  77         [MASTER_OSM_L3_APPS] = &sdm845_osm_apps_l3,
  78         [SLAVE_OSM_L3] = &sdm845_osm_l3,
  79 };
  80
  81 static const struct qcom_icc_desc sdm845_icc_osm_l3 = {
  82         .nodes = sdm845_osm_l3_nodes,
  83         .num_nodes = ARRAY_SIZE(sdm845_osm_l3_nodes),
  84 };
  85
  86 DEFINE_QNODE(sc7180_osm_apps_l3, SC7180_MASTER_OSM_L3_APPS, 16, SC7180_SLAVE_OSM_L3);
  87 DEFINE_QNODE(sc7180_osm_l3, SC7180_SLAVE_OSM_L3, 16);
  88
  89 static struct qcom_icc_node *sc7180_osm_l3_nodes[] = {
  90         [MASTER_OSM_L3_APPS] = &sc7180_osm_apps_l3,
  91         [SLAVE_OSM_L3] = &sc7180_osm_l3,
  92 };
  93
  94 static const struct qcom_icc_desc sc7180_icc_osm_l3 = {
  95         .nodes = sc7180_osm_l3_nodes,
  96         .num_nodes = ARRAY_SIZE(sc7180_osm_l3_nodes),
  97 };
  98
  99 static int qcom_icc_set(struct icc_node *src, struct icc_node *dst)
 100 {
 101         struct qcom_osm_l3_icc_provider *qp;
 102         struct icc_provider *provider;
 103         struct qcom_icc_node *qn;
 104         struct icc_node *n;
 105         unsigned int index;
 106         u32 agg_peak = 0;
 107         u32 agg_avg = 0;
 108         u64 rate;
 109
 110         qn = src->data;
 111         provider = src->provider;
 112         qp = to_qcom_provider(provider);
 113
 114         list_for_each_entry(n, &provider->nodes, node_list)
 115                 provider->aggregate(n, 0, n->avg_bw, n->peak_bw,
 116                                     &agg_avg, &agg_peak);
 117
 118         rate = max(agg_avg, agg_peak);
 119         rate = icc_units_to_bps(rate);
 120         do_div(rate, qn->buswidth);
 121
 122         for (index = 0; index < qp->max_state - 1; index++) {
 123                 if (qp->lut_tables[index] >= rate)
 124                         break;
 125         }
 126
 127         writel_relaxed(index, qp->base + REG_PERF_STATE);
 128
 129         return 0;
 130 }
 131
 132 static int qcom_osm_l3_remove(struct platform_device *pdev)
 133 {
 134         struct qcom_osm_l3_icc_provider *qp = platform_get_drvdata(pdev);
 135
 136         icc_nodes_remove(&qp->provider);
 137         return icc_provider_del(&qp->provider);
 138 }
 139
 140 static int qcom_osm_l3_probe(struct platform_device *pdev)
 141 {
 142         u32 info, src, lval, i, prev_freq = 0, freq;
 143         static unsigned long hw_rate, xo_rate;
 144         struct qcom_osm_l3_icc_provider *qp;
 145         const struct qcom_icc_desc *desc;
 146         struct icc_onecell_data *data;
 147         struct icc_provider *provider;
 148         struct qcom_icc_node **qnodes;
 149         struct icc_node *node;
 150         size_t num_nodes;
 151         struct clk *clk;
 152         int ret;
 153
 154         clk = clk_get(&pdev->dev, "xo");
 155         if (IS_ERR(clk))
 156                 return PTR_ERR(clk);
 157
 158         xo_rate = clk_get_rate(clk);
 159         clk_put(clk);
 160
 161         clk = clk_get(&pdev->dev, "alternate");
 162         if (IS_ERR(clk))
 163                 return PTR_ERR(clk);
 164
 165         hw_rate = clk_get_rate(clk) / CLK_HW_DIV;
 166         clk_put(clk);
 167
 168         qp = devm_kzalloc(&pdev->dev, sizeof(*qp), GFP_KERNEL);
 169         if (!qp)
 170                 return -ENOMEM;
 171
 172         qp->base = devm_platform_ioremap_resource(pdev, 0);
 173         if (IS_ERR(qp->base))
 174                 return PTR_ERR(qp->base);
 175
 176         /* HW should be in enabled state to proceed */
 177         if (!(readl_relaxed(qp->base + REG_ENABLE) & 0x1)) {
 178                 dev_err(&pdev->dev, "error hardware not enabled\n");
 179                 return -ENODEV;
 180         }
 181
 182         for (i = 0; i < LUT_MAX_ENTRIES; i++) {
 183                 info = readl_relaxed(qp->base + REG_FREQ_LUT +
 184                                      i * LUT_ROW_SIZE);
 185                 src = FIELD_GET(LUT_SRC, info);
 186                 lval = FIELD_GET(LUT_L_VAL, info);
 187                 if (src)
 188                         freq = xo_rate * lval;
 189                 else
 190                         freq = hw_rate;
 191
 192                 /* Two of the same frequencies signify end of table */
 193                 if (i > 0 && prev_freq == freq)
 194                         break;
 195
 196                 dev_dbg(&pdev->dev, "index=%d freq=%d\n", i, freq);
 197
 198                 qp->lut_tables[i] = freq;
 199                 prev_freq = freq;
 200         }
 201         qp->max_state = i;
 202
 203         desc = device_get_match_data(&pdev->dev);
 204         if (!desc)
 205                 return -EINVAL;
 206
 207         qnodes = desc->nodes;
 208         num_nodes = desc->num_nodes;
 209
 210         data = devm_kcalloc(&pdev->dev, num_nodes, sizeof(*node), GFP_KERNEL);
 211         if (!data)
 212                 return -ENOMEM;
 213
 214         provider = &qp->provider;
 215         provider->dev = &pdev->dev;
 216         provider->set = qcom_icc_set;
 217         provider->aggregate = icc_std_aggregate;
 218         provider->xlate = of_icc_xlate_onecell;
 219         INIT_LIST_HEAD(&provider->nodes);
 220         provider->data = data;
 221
 222         ret = icc_provider_add(provider);
 223         if (ret) {
 224                 dev_err(&pdev->dev, "error adding interconnect provider\n");
 225                 return ret;
 226         }
 227
 228         for (i = 0; i < num_nodes; i++) {
 229                 size_t j;
 230
 231                 node = icc_node_create(qnodes[i]->id);
 232                 if (IS_ERR(node)) {
 233                         ret = PTR_ERR(node);
 234                         goto err;
 235                 }
 236
 237                 node->name = qnodes[i]->name;
 238                 node->data = qnodes[i];
 239                 icc_node_add(node, provider);
 240
 241                 for (j = 0; j < qnodes[i]->num_links; j++)
 242                         icc_link_create(node, qnodes[i]->links[j]);
 243
 244                 data->nodes[i] = node;
 245         }
 246         data->num_nodes = num_nodes;
 247
 248         platform_set_drvdata(pdev, qp);
 249
 250         return 0;
 251 err:
 252         icc_nodes_remove(provider);
 253         icc_provider_del(provider);
 254
 255         return ret;
 256 }
 257
 258 static const struct of_device_id osm_l3_of_match[] = {
 259         { .compatible = "qcom,sc7180-osm-l3", .data = &sc7180_icc_osm_l3 },
 260         { .compatible = "qcom,sdm845-osm-l3", .data = &sdm845_icc_osm_l3 },
 261         { }
 262 };
 263 MODULE_DEVICE_TABLE(of, osm_l3_of_match);
 264
 265 static struct platform_driver osm_l3_driver = {
 266         .probe = qcom_osm_l3_probe,
 267         .remove = qcom_osm_l3_remove,
 268         .driver = {
 269                 .name = "osm-l3",
 270                 .of_match_table = osm_l3_of_match,
 271         },
 272 };
 273 module_platform_driver(osm_l3_driver);
 274
 275 MODULE_DESCRIPTION("Qualcomm OSM L3 interconnect driver");
 276 MODULE_LICENSE("GPL v2");