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7#include <linux/clk.h>
8#include <linux/devfreq-event.h>
9#include <linux/kernel.h>
10#include <linux/err.h>
11#include <linux/init.h>
12#include <linux/io.h>
13#include <linux/mfd/syscon.h>
14#include <linux/module.h>
15#include <linux/platform_device.h>
16#include <linux/regmap.h>
17#include <linux/slab.h>
18#include <linux/list.h>
19#include <linux/of.h>
20
21#include <soc/rockchip/rk3399_grf.h>
22
23#define RK3399_DMC_NUM_CH 2
24
25
26#define DDRMON_CTRL 0x04
27#define CLR_DDRMON_CTRL (0x1f0000 << 0)
28#define LPDDR4_EN (0x10001 << 4)
29#define HARDWARE_EN (0x10001 << 3)
30#define LPDDR3_EN (0x10001 << 2)
31#define SOFTWARE_EN (0x10001 << 1)
32#define SOFTWARE_DIS (0x10000 << 1)
33#define TIME_CNT_EN (0x10001 << 0)
34
35#define DDRMON_CH0_COUNT_NUM 0x28
36#define DDRMON_CH0_DFI_ACCESS_NUM 0x2c
37#define DDRMON_CH1_COUNT_NUM 0x3c
38#define DDRMON_CH1_DFI_ACCESS_NUM 0x40
39
40struct dmc_usage {
41 u32 access;
42 u32 total;
43};
44
45
46
47
48
49
50struct rockchip_dfi {
51 struct devfreq_event_dev *edev;
52 struct devfreq_event_desc *desc;
53 struct dmc_usage ch_usage[RK3399_DMC_NUM_CH];
54 struct device *dev;
55 void __iomem *regs;
56 struct regmap *regmap_pmu;
57 struct clk *clk;
58};
59
60static void rockchip_dfi_start_hardware_counter(struct devfreq_event_dev *edev)
61{
62 struct rockchip_dfi *info = devfreq_event_get_drvdata(edev);
63 void __iomem *dfi_regs = info->regs;
64 u32 val;
65 u32 ddr_type;
66
67
68 regmap_read(info->regmap_pmu, RK3399_PMUGRF_OS_REG2, &val);
69 ddr_type = (val >> RK3399_PMUGRF_DDRTYPE_SHIFT) &
70 RK3399_PMUGRF_DDRTYPE_MASK;
71
72
73 writel_relaxed(CLR_DDRMON_CTRL, dfi_regs + DDRMON_CTRL);
74
75
76 if (ddr_type == RK3399_PMUGRF_DDRTYPE_LPDDR3)
77 writel_relaxed(LPDDR3_EN, dfi_regs + DDRMON_CTRL);
78 else if (ddr_type == RK3399_PMUGRF_DDRTYPE_LPDDR4)
79 writel_relaxed(LPDDR4_EN, dfi_regs + DDRMON_CTRL);
80
81
82 writel_relaxed(SOFTWARE_EN, dfi_regs + DDRMON_CTRL);
83}
84
85static void rockchip_dfi_stop_hardware_counter(struct devfreq_event_dev *edev)
86{
87 struct rockchip_dfi *info = devfreq_event_get_drvdata(edev);
88 void __iomem *dfi_regs = info->regs;
89
90 writel_relaxed(SOFTWARE_DIS, dfi_regs + DDRMON_CTRL);
91}
92
93static int rockchip_dfi_get_busier_ch(struct devfreq_event_dev *edev)
94{
95 struct rockchip_dfi *info = devfreq_event_get_drvdata(edev);
96 u32 tmp, max = 0;
97 u32 i, busier_ch = 0;
98 void __iomem *dfi_regs = info->regs;
99
100 rockchip_dfi_stop_hardware_counter(edev);
101
102
103 for (i = 0; i < RK3399_DMC_NUM_CH; i++) {
104 info->ch_usage[i].access = readl_relaxed(dfi_regs +
105 DDRMON_CH0_DFI_ACCESS_NUM + i * 20) * 4;
106 info->ch_usage[i].total = readl_relaxed(dfi_regs +
107 DDRMON_CH0_COUNT_NUM + i * 20);
108 tmp = info->ch_usage[i].access;
109 if (tmp > max) {
110 busier_ch = i;
111 max = tmp;
112 }
113 }
114 rockchip_dfi_start_hardware_counter(edev);
115
116 return busier_ch;
117}
118
119static int rockchip_dfi_disable(struct devfreq_event_dev *edev)
120{
121 struct rockchip_dfi *info = devfreq_event_get_drvdata(edev);
122
123 rockchip_dfi_stop_hardware_counter(edev);
124 clk_disable_unprepare(info->clk);
125
126 return 0;
127}
128
129static int rockchip_dfi_enable(struct devfreq_event_dev *edev)
130{
131 struct rockchip_dfi *info = devfreq_event_get_drvdata(edev);
132 int ret;
133
134 ret = clk_prepare_enable(info->clk);
135 if (ret) {
136 dev_err(&edev->dev, "failed to enable dfi clk: %d\n", ret);
137 return ret;
138 }
139
140 rockchip_dfi_start_hardware_counter(edev);
141 return 0;
142}
143
144static int rockchip_dfi_set_event(struct devfreq_event_dev *edev)
145{
146 return 0;
147}
148
149static int rockchip_dfi_get_event(struct devfreq_event_dev *edev,
150 struct devfreq_event_data *edata)
151{
152 struct rockchip_dfi *info = devfreq_event_get_drvdata(edev);
153 int busier_ch;
154
155 busier_ch = rockchip_dfi_get_busier_ch(edev);
156
157 edata->load_count = info->ch_usage[busier_ch].access;
158 edata->total_count = info->ch_usage[busier_ch].total;
159
160 return 0;
161}
162
163static const struct devfreq_event_ops rockchip_dfi_ops = {
164 .disable = rockchip_dfi_disable,
165 .enable = rockchip_dfi_enable,
166 .get_event = rockchip_dfi_get_event,
167 .set_event = rockchip_dfi_set_event,
168};
169
170static const struct of_device_id rockchip_dfi_id_match[] = {
171 { .compatible = "rockchip,rk3399-dfi" },
172 { },
173};
174MODULE_DEVICE_TABLE(of, rockchip_dfi_id_match);
175
176static int rockchip_dfi_probe(struct platform_device *pdev)
177{
178 struct device *dev = &pdev->dev;
179 struct rockchip_dfi *data;
180 struct resource *res;
181 struct devfreq_event_desc *desc;
182 struct device_node *np = pdev->dev.of_node, *node;
183
184 data = devm_kzalloc(dev, sizeof(struct rockchip_dfi), GFP_KERNEL);
185 if (!data)
186 return -ENOMEM;
187
188 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
189 data->regs = devm_ioremap_resource(&pdev->dev, res);
190 if (IS_ERR(data->regs))
191 return PTR_ERR(data->regs);
192
193 data->clk = devm_clk_get(dev, "pclk_ddr_mon");
194 if (IS_ERR(data->clk)) {
195 dev_err(dev, "Cannot get the clk dmc_clk\n");
196 return PTR_ERR(data->clk);
197 }
198
199
200 node = of_parse_phandle(np, "rockchip,pmu", 0);
201 if (node) {
202 data->regmap_pmu = syscon_node_to_regmap(node);
203 if (IS_ERR(data->regmap_pmu))
204 return PTR_ERR(data->regmap_pmu);
205 }
206 data->dev = dev;
207
208 desc = devm_kzalloc(dev, sizeof(*desc), GFP_KERNEL);
209 if (!desc)
210 return -ENOMEM;
211
212 desc->ops = &rockchip_dfi_ops;
213 desc->driver_data = data;
214 desc->name = np->name;
215 data->desc = desc;
216
217 data->edev = devm_devfreq_event_add_edev(&pdev->dev, desc);
218 if (IS_ERR(data->edev)) {
219 dev_err(&pdev->dev,
220 "failed to add devfreq-event device\n");
221 return PTR_ERR(data->edev);
222 }
223
224 platform_set_drvdata(pdev, data);
225
226 return 0;
227}
228
229static struct platform_driver rockchip_dfi_driver = {
230 .probe = rockchip_dfi_probe,
231 .driver = {
232 .name = "rockchip-dfi",
233 .of_match_table = rockchip_dfi_id_match,
234 },
235};
236module_platform_driver(rockchip_dfi_driver);
237
238MODULE_LICENSE("GPL v2");
239MODULE_AUTHOR("Lin Huang <hl@rock-chips.com>");
240MODULE_DESCRIPTION("Rockchip DFI driver");
241
