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15
16#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
17
18#include <linux/types.h>
19#include <linux/module.h>
20#include <linux/device.h>
21#include <linux/io.h>
22#include <linux/mm.h>
23#include <linux/slab.h>
24#include <linux/stm.h>
25
26#include "intel_th.h"
27#include "sth.h"
28
29struct sth_device {
30 void __iomem *base;
31 void __iomem *channels;
32 phys_addr_t channels_phys;
33 struct device *dev;
34 struct stm_data stm;
35 unsigned int sw_nmasters;
36};
37
38static struct intel_th_channel __iomem *
39sth_channel(struct sth_device *sth, unsigned int master, unsigned int channel)
40{
41 struct intel_th_channel __iomem *sw_map = sth->channels;
42
43 return &sw_map[(master - sth->stm.sw_start) * sth->stm.sw_nchannels +
44 channel];
45}
46
47static void sth_iowrite(void __iomem *dest, const unsigned char *payload,
48 unsigned int size)
49{
50 switch (size) {
51#ifdef CONFIG_64BIT
52 case 8:
53 writeq_relaxed(*(u64 *)payload, dest);
54 break;
55#endif
56 case 4:
57 writel_relaxed(*(u32 *)payload, dest);
58 break;
59 case 2:
60 writew_relaxed(*(u16 *)payload, dest);
61 break;
62 case 1:
63 writeb_relaxed(*(u8 *)payload, dest);
64 break;
65 default:
66 break;
67 }
68}
69
70static ssize_t sth_stm_packet(struct stm_data *stm_data, unsigned int master,
71 unsigned int channel, unsigned int packet,
72 unsigned int flags, unsigned int size,
73 const unsigned char *payload)
74{
75 struct sth_device *sth = container_of(stm_data, struct sth_device, stm);
76 struct intel_th_channel __iomem *out =
77 sth_channel(sth, master, channel);
78 u64 __iomem *outp = &out->Dn;
79 unsigned long reg = REG_STH_TRIG;
80
81#ifndef CONFIG_64BIT
82 if (size > 4)
83 size = 4;
84#endif
85
86 size = rounddown_pow_of_two(size);
87
88 switch (packet) {
89
90 case STP_PACKET_GERR:
91 reg += 4;
92 case STP_PACKET_XSYNC:
93 reg += 8;
94 case STP_PACKET_TRIG:
95 if (flags & STP_PACKET_TIMESTAMPED)
96 reg += 4;
97 writeb_relaxed(*payload, sth->base + reg);
98 break;
99
100 case STP_PACKET_MERR:
101 if (size > 4)
102 size = 4;
103
104 sth_iowrite(&out->MERR, payload, size);
105 break;
106
107 case STP_PACKET_FLAG:
108 if (flags & STP_PACKET_TIMESTAMPED)
109 outp = (u64 __iomem *)&out->FLAG_TS;
110 else
111 outp = (u64 __iomem *)&out->FLAG;
112
113 size = 0;
114 writeb_relaxed(0, outp);
115 break;
116
117 case STP_PACKET_USER:
118 if (flags & STP_PACKET_TIMESTAMPED)
119 outp = &out->USER_TS;
120 else
121 outp = &out->USER;
122 sth_iowrite(outp, payload, size);
123 break;
124
125 case STP_PACKET_DATA:
126 outp = &out->Dn;
127
128 if (flags & STP_PACKET_TIMESTAMPED)
129 outp += 2;
130 if (flags & STP_PACKET_MARKED)
131 outp++;
132
133 sth_iowrite(outp, payload, size);
134 break;
135 default:
136 return -ENOTSUPP;
137 }
138
139 return size;
140}
141
142static phys_addr_t
143sth_stm_mmio_addr(struct stm_data *stm_data, unsigned int master,
144 unsigned int channel, unsigned int nr_chans)
145{
146 struct sth_device *sth = container_of(stm_data, struct sth_device, stm);
147 phys_addr_t addr;
148
149 master -= sth->stm.sw_start;
150 addr = sth->channels_phys + (master * sth->stm.sw_nchannels + channel) *
151 sizeof(struct intel_th_channel);
152
153 if (offset_in_page(addr) ||
154 offset_in_page(nr_chans * sizeof(struct intel_th_channel)))
155 return 0;
156
157 return addr;
158}
159
160static int sth_stm_link(struct stm_data *stm_data, unsigned int master,
161 unsigned int channel)
162{
163 struct sth_device *sth = container_of(stm_data, struct sth_device, stm);
164
165 intel_th_set_output(to_intel_th_device(sth->dev), master);
166
167 return 0;
168}
169
170static int intel_th_sw_init(struct sth_device *sth)
171{
172 u32 reg;
173
174 reg = ioread32(sth->base + REG_STH_STHCAP1);
175 sth->stm.sw_nchannels = reg & 0xff;
176
177 reg = ioread32(sth->base + REG_STH_STHCAP0);
178 sth->stm.sw_start = reg & 0xffff;
179 sth->stm.sw_end = reg >> 16;
180
181 sth->sw_nmasters = sth->stm.sw_end - sth->stm.sw_start;
182 dev_dbg(sth->dev, "sw_start: %x sw_end: %x masters: %x nchannels: %x\n",
183 sth->stm.sw_start, sth->stm.sw_end, sth->sw_nmasters,
184 sth->stm.sw_nchannels);
185
186 return 0;
187}
188
189static int intel_th_sth_probe(struct intel_th_device *thdev)
190{
191 struct device *dev = &thdev->dev;
192 struct sth_device *sth;
193 struct resource *res;
194 void __iomem *base, *channels;
195 int err;
196
197 res = intel_th_device_get_resource(thdev, IORESOURCE_MEM, 0);
198 if (!res)
199 return -ENODEV;
200
201 base = devm_ioremap(dev, res->start, resource_size(res));
202 if (!base)
203 return -ENOMEM;
204
205 res = intel_th_device_get_resource(thdev, IORESOURCE_MEM, 1);
206 if (!res)
207 return -ENODEV;
208
209 channels = devm_ioremap(dev, res->start, resource_size(res));
210 if (!channels)
211 return -ENOMEM;
212
213 sth = devm_kzalloc(dev, sizeof(*sth), GFP_KERNEL);
214 if (!sth)
215 return -ENOMEM;
216
217 sth->dev = dev;
218 sth->base = base;
219 sth->channels = channels;
220 sth->channels_phys = res->start;
221 sth->stm.name = dev_name(dev);
222 sth->stm.packet = sth_stm_packet;
223 sth->stm.mmio_addr = sth_stm_mmio_addr;
224 sth->stm.sw_mmiosz = sizeof(struct intel_th_channel);
225 sth->stm.link = sth_stm_link;
226
227 err = intel_th_sw_init(sth);
228 if (err)
229 return err;
230
231 err = stm_register_device(dev, &sth->stm, THIS_MODULE);
232 if (err) {
233 dev_err(dev, "stm_register_device failed\n");
234 return err;
235 }
236
237 dev_set_drvdata(dev, sth);
238
239 return 0;
240}
241
242static void intel_th_sth_remove(struct intel_th_device *thdev)
243{
244 struct sth_device *sth = dev_get_drvdata(&thdev->dev);
245
246 stm_unregister_device(&sth->stm);
247}
248
249static struct intel_th_driver intel_th_sth_driver = {
250 .probe = intel_th_sth_probe,
251 .remove = intel_th_sth_remove,
252 .driver = {
253 .name = "sth",
254 .owner = THIS_MODULE,
255 },
256};
257
258module_driver(intel_th_sth_driver,
259 intel_th_driver_register,
260 intel_th_driver_unregister);
261
262MODULE_LICENSE("GPL v2");
263MODULE_DESCRIPTION("Intel(R) Trace Hub Software Trace Hub driver");
264MODULE_AUTHOR("Alexander Shishkin <alexander.shishkin@intel.com>");
265
