1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright (C) 2017, STMicroelectronics - All Rights Reserved
4 * Author(s): Patrice Chotard, <patrice.chotard@st.com> for STMicroelectronics.
5 */
6
7 #include <common.h>
8 #include <errno.h>
9 #include <wait_bit.h>
10 #include <dm.h>
11 #include <reset-uclass.h>
12 #include <regmap.h>
13 #include <syscon.h>
14 #include <dt-bindings/reset/stih407-resets.h>
15
16 DECLARE_GLOBAL_DATA_PTR;
17
18 struct sti_reset {
19 const struct syscfg_reset_controller_data *data;
20 };
21
22 /**
23 * Reset channel description for a system configuration register based
24 * reset controller.
25 *
26 * @compatible: Compatible string of the syscon containing this
27 * channel's control and ack (status) bits.
28 * @reset_offset: Reset register offset in sysconf bank.
29 * @reset_bit: Bit number in reset register.
30 * @ack_offset: Ack reset register offset in syscon bank.
31 * @ack_bit: Bit number in Ack reset register.
32 * @deassert_cnt: incremented when reset is deasserted, reset can only be
33 * asserted when equal to 0
34 */
35
36 struct syscfg_reset_channel_data {
37 const char *compatible;
38 int reset_offset;
39 int reset_bit;
40 int ack_offset;
41 int ack_bit;
42 int deassert_cnt;
43 };
44
45 /**
46 * Description of a system configuration register based reset controller.
47 *
48 * @wait_for_ack: The controller will wait for reset assert and de-assert to
49 * be "ack'd" in a channel's ack field.
50 * @active_low: Are the resets in this controller active low, i.e. clearing
51 * the reset bit puts the hardware into reset.
52 * @nr_channels: The number of reset channels in this controller.
53 * @channels: An array of reset channel descriptions.
54 */
55 struct syscfg_reset_controller_data {
56 bool wait_for_ack;
57 bool active_low;
58 int nr_channels;
59 struct syscfg_reset_channel_data *channels;
60 };
61
62 /* STiH407 Peripheral powerdown definitions. */
63 static const char stih407_core[] = "st,stih407-core-syscfg";
64 static const char stih407_sbc_reg[] = "st,stih407-sbc-reg-syscfg";
65 static const char stih407_lpm[] = "st,stih407-lpm-syscfg";
66
67 #define _SYSCFG_RST_CH(_c, _rr, _rb, _ar, _ab) \
68 { .compatible = _c, \
69 .reset_offset = _rr, \
70 .reset_bit = _rb, \
71 .ack_offset = _ar, \
72 .ack_bit = _ab, }
73
74 #define _SYSCFG_RST_CH_NO_ACK(_c, _rr, _rb) \
75 { .compatible = _c, \
76 .reset_offset = _rr, \
77 .reset_bit = _rb, }
78
79 #define STIH407_SRST_CORE(_reg, _bit) \
80 _SYSCFG_RST_CH_NO_ACK(stih407_core, _reg, _bit)
81
82 #define STIH407_SRST_SBC(_reg, _bit) \
83 _SYSCFG_RST_CH_NO_ACK(stih407_sbc_reg, _reg, _bit)
84
85 #define STIH407_SRST_LPM(_reg, _bit) \
86 _SYSCFG_RST_CH_NO_ACK(stih407_lpm, _reg, _bit)
87
88 #define STIH407_PDN_0(_bit) \
89 _SYSCFG_RST_CH(stih407_core, SYSCFG_5000, _bit, SYSSTAT_5500, _bit)
90 #define STIH407_PDN_1(_bit) \
91 _SYSCFG_RST_CH(stih407_core, SYSCFG_5001, _bit, SYSSTAT_5501, _bit)
92 #define STIH407_PDN_ETH(_bit, _stat) \
93 _SYSCFG_RST_CH(stih407_sbc_reg, SYSCFG_4032, _bit, SYSSTAT_4520, _stat)
94
95 /* Powerdown requests control 0 */
96 #define SYSCFG_5000 0x0
97 #define SYSSTAT_5500 0x7d0
98 /* Powerdown requests control 1 (High Speed Links) */
99 #define SYSCFG_5001 0x4
100 #define SYSSTAT_5501 0x7d4
101
102 /* Ethernet powerdown/status/reset */
103 #define SYSCFG_4032 0x80
104 #define SYSSTAT_4520 0x820
105 #define SYSCFG_4002 0x8
106
107 static struct syscfg_reset_channel_data stih407_powerdowns[] = {
108 [STIH407_EMISS_POWERDOWN] = STIH407_PDN_0(1),
109 [STIH407_NAND_POWERDOWN] = STIH407_PDN_0(0),
110 [STIH407_USB3_POWERDOWN] = STIH407_PDN_1(6),
111 [STIH407_USB2_PORT1_POWERDOWN] = STIH407_PDN_1(5),
112 [STIH407_USB2_PORT0_POWERDOWN] = STIH407_PDN_1(4),
113 [STIH407_PCIE1_POWERDOWN] = STIH407_PDN_1(3),
114 [STIH407_PCIE0_POWERDOWN] = STIH407_PDN_1(2),
115 [STIH407_SATA1_POWERDOWN] = STIH407_PDN_1(1),
116 [STIH407_SATA0_POWERDOWN] = STIH407_PDN_1(0),
117 [STIH407_ETH1_POWERDOWN] = STIH407_PDN_ETH(0, 2),
118 };
119
120 /* Reset Generator control 0/1 */
121 #define SYSCFG_5128 0x200
122 #define SYSCFG_5131 0x20c
123 #define SYSCFG_5132 0x210
124
125 #define LPM_SYSCFG_1 0x4 /* Softreset IRB & SBC UART */
126
127 static struct syscfg_reset_channel_data stih407_softresets[] = {
128 [STIH407_ETH1_SOFTRESET] = STIH407_SRST_SBC(SYSCFG_4002, 4),
129 [STIH407_MMC1_SOFTRESET] = STIH407_SRST_CORE(SYSCFG_5132, 3),
130 [STIH407_USB2_PORT0_SOFTRESET] = STIH407_SRST_CORE(SYSCFG_5132, 28),
131 [STIH407_USB2_PORT1_SOFTRESET] = STIH407_SRST_CORE(SYSCFG_5132, 29),
132 [STIH407_PICOPHY_SOFTRESET] = STIH407_SRST_CORE(SYSCFG_5132, 30),
133 [STIH407_IRB_SOFTRESET] = STIH407_SRST_LPM(LPM_SYSCFG_1, 6),
134 [STIH407_PCIE0_SOFTRESET] = STIH407_SRST_CORE(SYSCFG_5132, 6),
135 [STIH407_PCIE1_SOFTRESET] = STIH407_SRST_CORE(SYSCFG_5132, 15),
136 [STIH407_SATA0_SOFTRESET] = STIH407_SRST_CORE(SYSCFG_5132, 7),
137 [STIH407_SATA1_SOFTRESET] = STIH407_SRST_CORE(SYSCFG_5132, 16),
138 [STIH407_MIPHY0_SOFTRESET] = STIH407_SRST_CORE(SYSCFG_5132, 4),
139 [STIH407_MIPHY1_SOFTRESET] = STIH407_SRST_CORE(SYSCFG_5132, 13),
140 [STIH407_MIPHY2_SOFTRESET] = STIH407_SRST_CORE(SYSCFG_5132, 22),
141 [STIH407_SATA0_PWR_SOFTRESET] = STIH407_SRST_CORE(SYSCFG_5132, 5),
142 [STIH407_SATA1_PWR_SOFTRESET] = STIH407_SRST_CORE(SYSCFG_5132, 14),
143 [STIH407_DELTA_SOFTRESET] = STIH407_SRST_CORE(SYSCFG_5131, 3),
144 [STIH407_BLITTER_SOFTRESET] = STIH407_SRST_CORE(SYSCFG_5131, 10),
145 [STIH407_HDTVOUT_SOFTRESET] = STIH407_SRST_CORE(SYSCFG_5131, 11),
146 [STIH407_HDQVDP_SOFTRESET] = STIH407_SRST_CORE(SYSCFG_5131, 12),
147 [STIH407_VDP_AUX_SOFTRESET] = STIH407_SRST_CORE(SYSCFG_5131, 14),
148 [STIH407_COMPO_SOFTRESET] = STIH407_SRST_CORE(SYSCFG_5131, 15),
149 [STIH407_HDMI_TX_PHY_SOFTRESET] = STIH407_SRST_CORE(SYSCFG_5131, 21),
150 [STIH407_JPEG_DEC_SOFTRESET] = STIH407_SRST_CORE(SYSCFG_5131, 23),
151 [STIH407_VP8_DEC_SOFTRESET] = STIH407_SRST_CORE(SYSCFG_5131, 24),
152 [STIH407_GPU_SOFTRESET] = STIH407_SRST_CORE(SYSCFG_5131, 30),
153 [STIH407_HVA_SOFTRESET] = STIH407_SRST_CORE(SYSCFG_5132, 0),
154 [STIH407_ERAM_HVA_SOFTRESET] = STIH407_SRST_CORE(SYSCFG_5132, 1),
155 [STIH407_LPM_SOFTRESET] = STIH407_SRST_SBC(SYSCFG_4002, 2),
156 [STIH407_KEYSCAN_SOFTRESET] = STIH407_SRST_LPM(LPM_SYSCFG_1, 8),
157 [STIH407_ST231_AUD_SOFTRESET] = STIH407_SRST_CORE(SYSCFG_5131, 26),
158 [STIH407_ST231_DMU_SOFTRESET] = STIH407_SRST_CORE(SYSCFG_5131, 27),
159 [STIH407_ST231_GP0_SOFTRESET] = STIH407_SRST_CORE(SYSCFG_5131, 28),
160 [STIH407_ST231_GP1_SOFTRESET] = STIH407_SRST_CORE(SYSCFG_5128, 2),
161 };
162
163 /* PicoPHY reset/control */
164 #define SYSCFG_5061 0x0f4
165
166 static struct syscfg_reset_channel_data stih407_picophyresets[] = {
167 [STIH407_PICOPHY0_RESET] = STIH407_SRST_CORE(SYSCFG_5061, 5),
168 [STIH407_PICOPHY1_RESET] = STIH407_SRST_CORE(SYSCFG_5061, 6),
169 [STIH407_PICOPHY2_RESET] = STIH407_SRST_CORE(SYSCFG_5061, 7),
170 };
171
172 static const struct
173 syscfg_reset_controller_data stih407_powerdown_controller = {
174 .wait_for_ack = true,
175 .nr_channels = ARRAY_SIZE(stih407_powerdowns),
176 .channels = stih407_powerdowns,
177 };
178
179 static const struct
180 syscfg_reset_controller_data stih407_softreset_controller = {
181 .wait_for_ack = false,
182 .active_low = true,
183 .nr_channels = ARRAY_SIZE(stih407_softresets),
184 .channels = stih407_softresets,
185 };
186
187 static const struct
188 syscfg_reset_controller_data stih407_picophyreset_controller = {
189 .wait_for_ack = false,
190 .nr_channels = ARRAY_SIZE(stih407_picophyresets),
191 .channels = stih407_picophyresets,
192 };
193
sti_reset_get_regmap(const char * compatible)194 phys_addr_t sti_reset_get_regmap(const char *compatible)
195 {
196 struct udevice *syscon;
197 struct regmap *regmap;
198 int node, ret;
199
200 node = fdt_node_offset_by_compatible(gd->fdt_blob, -1,
201 compatible);
202 if (node < 0) {
203 pr_err("unable to find %s node\n", compatible);
204 return node;
205 }
206
207 ret = uclass_get_device_by_of_offset(UCLASS_SYSCON, node, &syscon);
208 if (ret) {
209 pr_err("%s: uclass_get_device_by_of_offset failed: %d\n",
210 __func__, ret);
211 return ret;
212 }
213
214 regmap = syscon_get_regmap(syscon);
215 if (!regmap) {
216 pr_err("unable to get regmap for %s\n", syscon->name);
217 return -ENODEV;
218 }
219
220 return regmap->ranges[0].start;
221 }
222
sti_reset_program_hw(struct reset_ctl * reset_ctl,int assert)223 static int sti_reset_program_hw(struct reset_ctl *reset_ctl, int assert)
224 {
225 struct udevice *dev = reset_ctl->dev;
226 struct syscfg_reset_controller_data *reset_desc =
227 (struct syscfg_reset_controller_data *)(dev->driver_data);
228 struct syscfg_reset_channel_data *ch;
229 phys_addr_t base;
230 u32 ctrl_val = reset_desc->active_low ? !assert : !!assert;
231 void __iomem *reg;
232
233 /* check if reset id is inside available range */
234 if (reset_ctl->id >= reset_desc->nr_channels)
235 return -EINVAL;
236
237 /* get reset sysconf register base address */
238 base = sti_reset_get_regmap(reset_desc->channels[reset_ctl->id].compatible);
239
240 ch = &reset_desc->channels[reset_ctl->id];
241
242 /* check the deassert counter to assert reset when it reaches 0 */
243 if (!assert) {
244 ch->deassert_cnt++;
245 if (ch->deassert_cnt > 1)
246 return 0;
247 } else {
248 if (ch->deassert_cnt > 0) {
249 ch->deassert_cnt--;
250 if (ch->deassert_cnt > 0)
251 return 0;
252 } else
253 pr_err("Reset balancing error: reset_ctl=%p dev=%p id=%lu\n",
254 reset_ctl, reset_ctl->dev, reset_ctl->id);
255 }
256
257 reg = (void __iomem *)base + ch->reset_offset;
258
259 if (ctrl_val)
260 generic_set_bit(ch->reset_bit, reg);
261 else
262 generic_clear_bit(ch->reset_bit, reg);
263
264 if (!reset_desc->wait_for_ack)
265 return 0;
266
267 reg = (void __iomem *)base + ch->ack_offset;
268 if (wait_for_bit_le32(reg, BIT(ch->ack_bit), ctrl_val,
269 1000, false)) {
270 pr_err("Stuck on waiting ack reset_ctl=%p dev=%p id=%lu\n",
271 reset_ctl, reset_ctl->dev, reset_ctl->id);
272
273 return -ETIMEDOUT;
274 }
275
276 return 0;
277 }
278
sti_reset_request(struct reset_ctl * reset_ctl)279 static int sti_reset_request(struct reset_ctl *reset_ctl)
280 {
281 return 0;
282 }
283
sti_reset_free(struct reset_ctl * reset_ctl)284 static int sti_reset_free(struct reset_ctl *reset_ctl)
285 {
286 return 0;
287 }
288
sti_reset_assert(struct reset_ctl * reset_ctl)289 static int sti_reset_assert(struct reset_ctl *reset_ctl)
290 {
291 return sti_reset_program_hw(reset_ctl, true);
292 }
293
sti_reset_deassert(struct reset_ctl * reset_ctl)294 static int sti_reset_deassert(struct reset_ctl *reset_ctl)
295 {
296 return sti_reset_program_hw(reset_ctl, false);
297 }
298
299 struct reset_ops sti_reset_ops = {
300 .request = sti_reset_request,
301 .free = sti_reset_free,
302 .rst_assert = sti_reset_assert,
303 .rst_deassert = sti_reset_deassert,
304 };
305
sti_reset_probe(struct udevice * dev)306 static int sti_reset_probe(struct udevice *dev)
307 {
308 struct sti_reset *priv = dev_get_priv(dev);
309
310 priv->data = (void *)dev_get_driver_data(dev);
311
312 return 0;
313 }
314
315 static const struct udevice_id sti_reset_ids[] = {
316 {
317 .compatible = "st,stih407-picophyreset",
318 .data = (ulong)&stih407_picophyreset_controller,
319 },
320 {
321 .compatible = "st,stih407-powerdown",
322 .data = (ulong)&stih407_powerdown_controller,
323 },
324 {
325 .compatible = "st,stih407-softreset",
326 .data = (ulong)&stih407_softreset_controller,
327 },
328 { }
329 };
330
331 U_BOOT_DRIVER(sti_reset) = {
332 .name = "sti_reset",
333 .id = UCLASS_RESET,
334 .of_match = sti_reset_ids,
335 .probe = sti_reset_probe,
336 .priv_auto_alloc_size = sizeof(struct sti_reset),
337 .ops = &sti_reset_ops,
338 };
339