1 // SPDX-License-Identifier: GPL-2.0
5 * Copyright (C) 2019 Texas Instruments Incorporated - http://www.ti.com/
9 #include <linux/kernel.h>
10 #include <linux/device.h>
12 #include <linux/iopoll.h>
14 #include <linux/of_device.h>
15 #include <linux/platform_device.h>
16 #include <linux/reset-controller.h>
17 #include <linux/delay.h>
19 #include <linux/platform_data/ti-prm.h>
26 struct omap_prm_data {
29 const char *clkdm_name;
32 const struct omap_rst_map *rstmap;
37 const struct omap_prm_data *data;
41 struct omap_reset_data {
42 struct reset_controller_dev rcdev;
46 struct clockdomain *clkdm;
50 #define to_omap_reset_data(p) container_of((p), struct omap_reset_data, rcdev)
52 #define OMAP_MAX_RESETS 8
53 #define OMAP_RESET_MAX_WAIT 10000
55 #define OMAP_PRM_HAS_RSTCTRL BIT(0)
56 #define OMAP_PRM_HAS_RSTST BIT(1)
57 #define OMAP_PRM_HAS_NO_CLKDM BIT(2)
59 #define OMAP_PRM_HAS_RESETS (OMAP_PRM_HAS_RSTCTRL | OMAP_PRM_HAS_RSTST)
61 static const struct omap_rst_map rst_map_0[] = {
62 { .rst = 0, .st = 0 },
66 static const struct omap_rst_map rst_map_01[] = {
67 { .rst = 0, .st = 0 },
68 { .rst = 1, .st = 1 },
72 static const struct omap_rst_map rst_map_012[] = {
73 { .rst = 0, .st = 0 },
74 { .rst = 1, .st = 1 },
75 { .rst = 2, .st = 2 },
79 static const struct omap_prm_data omap4_prm_data[] = {
80 { .name = "tesla", .base = 0x4a306400, .rstctrl = 0x10, .rstst = 0x14, .rstmap = rst_map_01 },
81 { .name = "core", .base = 0x4a306700, .rstctrl = 0x210, .rstst = 0x214, .clkdm_name = "ducati", .rstmap = rst_map_012 },
82 { .name = "ivahd", .base = 0x4a306f00, .rstctrl = 0x10, .rstst = 0x14, .rstmap = rst_map_012 },
83 { .name = "device", .base = 0x4a307b00, .rstctrl = 0x0, .rstst = 0x4, .rstmap = rst_map_01, .flags = OMAP_PRM_HAS_RSTCTRL | OMAP_PRM_HAS_NO_CLKDM },
87 static const struct omap_prm_data omap5_prm_data[] = {
88 { .name = "dsp", .base = 0x4ae06400, .rstctrl = 0x10, .rstst = 0x14, .rstmap = rst_map_01 },
89 { .name = "core", .base = 0x4ae06700, .rstctrl = 0x210, .rstst = 0x214, .clkdm_name = "ipu", .rstmap = rst_map_012 },
90 { .name = "iva", .base = 0x4ae07200, .rstctrl = 0x10, .rstst = 0x14, .rstmap = rst_map_012 },
91 { .name = "device", .base = 0x4ae07c00, .rstctrl = 0x0, .rstst = 0x4, .rstmap = rst_map_01, .flags = OMAP_PRM_HAS_RSTCTRL | OMAP_PRM_HAS_NO_CLKDM },
95 static const struct omap_prm_data dra7_prm_data[] = {
96 { .name = "dsp1", .base = 0x4ae06400, .rstctrl = 0x10, .rstst = 0x14, .rstmap = rst_map_01 },
97 { .name = "ipu", .base = 0x4ae06500, .rstctrl = 0x10, .rstst = 0x14, .clkdm_name = "ipu1", .rstmap = rst_map_012 },
98 { .name = "core", .base = 0x4ae06700, .rstctrl = 0x210, .rstst = 0x214, .clkdm_name = "ipu2", .rstmap = rst_map_012 },
99 { .name = "iva", .base = 0x4ae06f00, .rstctrl = 0x10, .rstst = 0x14, .rstmap = rst_map_012 },
100 { .name = "dsp2", .base = 0x4ae07b00, .rstctrl = 0x10, .rstst = 0x14, .rstmap = rst_map_01 },
101 { .name = "eve1", .base = 0x4ae07b40, .rstctrl = 0x10, .rstst = 0x14, .rstmap = rst_map_01 },
102 { .name = "eve2", .base = 0x4ae07b80, .rstctrl = 0x10, .rstst = 0x14, .rstmap = rst_map_01 },
103 { .name = "eve3", .base = 0x4ae07bc0, .rstctrl = 0x10, .rstst = 0x14, .rstmap = rst_map_01 },
104 { .name = "eve4", .base = 0x4ae07c00, .rstctrl = 0x10, .rstst = 0x14, .rstmap = rst_map_01 },
108 static const struct omap_rst_map am3_per_rst_map[] = {
113 static const struct omap_rst_map am3_wkup_rst_map[] = {
114 { .rst = 3, .st = 5 },
118 static const struct omap_prm_data am3_prm_data[] = {
119 { .name = "per", .base = 0x44e00c00, .rstctrl = 0x0, .rstmap = am3_per_rst_map, .flags = OMAP_PRM_HAS_RSTCTRL, .clkdm_name = "pruss_ocp" },
120 { .name = "wkup", .base = 0x44e00d00, .rstctrl = 0x0, .rstst = 0xc, .rstmap = am3_wkup_rst_map, .flags = OMAP_PRM_HAS_RSTCTRL | OMAP_PRM_HAS_NO_CLKDM },
121 { .name = "device", .base = 0x44e00f00, .rstctrl = 0x0, .rstst = 0x8, .rstmap = rst_map_01, .flags = OMAP_PRM_HAS_RSTCTRL | OMAP_PRM_HAS_NO_CLKDM },
122 { .name = "gfx", .base = 0x44e01100, .rstctrl = 0x4, .rstst = 0x14, .rstmap = rst_map_0, .clkdm_name = "gfx_l3" },
126 static const struct omap_rst_map am4_per_rst_map[] = {
127 { .rst = 1, .st = 0 },
131 static const struct omap_rst_map am4_device_rst_map[] = {
132 { .rst = 0, .st = 1 },
133 { .rst = 1, .st = 0 },
137 static const struct omap_prm_data am4_prm_data[] = {
138 { .name = "gfx", .base = 0x44df0400, .rstctrl = 0x10, .rstst = 0x14, .rstmap = rst_map_0, .clkdm_name = "gfx_l3" },
139 { .name = "per", .base = 0x44df0800, .rstctrl = 0x10, .rstst = 0x14, .rstmap = am4_per_rst_map, .clkdm_name = "pruss_ocp" },
140 { .name = "wkup", .base = 0x44df2000, .rstctrl = 0x10, .rstst = 0x14, .rstmap = am3_wkup_rst_map, .flags = OMAP_PRM_HAS_NO_CLKDM },
141 { .name = "device", .base = 0x44df4000, .rstctrl = 0x0, .rstst = 0x4, .rstmap = am4_device_rst_map, .flags = OMAP_PRM_HAS_RSTCTRL | OMAP_PRM_HAS_NO_CLKDM },
145 static const struct of_device_id omap_prm_id_table[] = {
146 { .compatible = "ti,omap4-prm-inst", .data = omap4_prm_data },
147 { .compatible = "ti,omap5-prm-inst", .data = omap5_prm_data },
148 { .compatible = "ti,dra7-prm-inst", .data = dra7_prm_data },
149 { .compatible = "ti,am3-prm-inst", .data = am3_prm_data },
150 { .compatible = "ti,am4-prm-inst", .data = am4_prm_data },
154 static bool _is_valid_reset(struct omap_reset_data *reset, unsigned long id)
156 if (reset->mask & BIT(id))
162 static int omap_reset_get_st_bit(struct omap_reset_data *reset,
165 const struct omap_rst_map *map = reset->prm->data->rstmap;
167 while (map->rst >= 0) {
177 static int omap_reset_status(struct reset_controller_dev *rcdev,
180 struct omap_reset_data *reset = to_omap_reset_data(rcdev);
182 int st_bit = omap_reset_get_st_bit(reset, id);
183 bool has_rstst = reset->prm->data->rstst ||
184 (reset->prm->data->flags & OMAP_PRM_HAS_RSTST);
186 /* Check if we have rstst */
190 /* Check if hw reset line is asserted */
191 v = readl_relaxed(reset->prm->base + reset->prm->data->rstctrl);
196 * Check reset status, high value means reset sequence has been
197 * completed successfully so we can return 0 here (reset deasserted)
199 v = readl_relaxed(reset->prm->base + reset->prm->data->rstst);
206 static int omap_reset_assert(struct reset_controller_dev *rcdev,
209 struct omap_reset_data *reset = to_omap_reset_data(rcdev);
213 /* assert the reset control line */
214 spin_lock_irqsave(&reset->lock, flags);
215 v = readl_relaxed(reset->prm->base + reset->prm->data->rstctrl);
217 writel_relaxed(v, reset->prm->base + reset->prm->data->rstctrl);
218 spin_unlock_irqrestore(&reset->lock, flags);
223 static int omap_reset_deassert(struct reset_controller_dev *rcdev,
226 struct omap_reset_data *reset = to_omap_reset_data(rcdev);
231 struct ti_prm_platform_data *pdata = dev_get_platdata(reset->dev);
234 has_rstst = reset->prm->data->rstst ||
235 (reset->prm->data->flags & OMAP_PRM_HAS_RSTST);
238 st_bit = omap_reset_get_st_bit(reset, id);
240 /* Clear the reset status by writing 1 to the status bit */
242 writel_relaxed(v, reset->prm->base + reset->prm->data->rstst);
246 pdata->clkdm_deny_idle(reset->clkdm);
248 /* de-assert the reset control line */
249 spin_lock_irqsave(&reset->lock, flags);
250 v = readl_relaxed(reset->prm->base + reset->prm->data->rstctrl);
252 writel_relaxed(v, reset->prm->base + reset->prm->data->rstctrl);
253 spin_unlock_irqrestore(&reset->lock, flags);
258 /* wait for the status to be set */
259 ret = readl_relaxed_poll_timeout_atomic(reset->prm->base +
260 reset->prm->data->rstst,
261 v, v & BIT(st_bit), 1,
262 OMAP_RESET_MAX_WAIT);
264 pr_err("%s: timedout waiting for %s:%lu\n", __func__,
265 reset->prm->data->name, id);
269 pdata->clkdm_allow_idle(reset->clkdm);
274 static const struct reset_control_ops omap_reset_ops = {
275 .assert = omap_reset_assert,
276 .deassert = omap_reset_deassert,
277 .status = omap_reset_status,
280 static int omap_prm_reset_xlate(struct reset_controller_dev *rcdev,
281 const struct of_phandle_args *reset_spec)
283 struct omap_reset_data *reset = to_omap_reset_data(rcdev);
285 if (!_is_valid_reset(reset, reset_spec->args[0]))
288 return reset_spec->args[0];
291 static int omap_prm_reset_init(struct platform_device *pdev,
292 struct omap_prm *prm)
294 struct omap_reset_data *reset;
295 const struct omap_rst_map *map;
296 struct ti_prm_platform_data *pdata = dev_get_platdata(&pdev->dev);
300 * Check if we have controllable resets. If either rstctrl is non-zero
301 * or OMAP_PRM_HAS_RSTCTRL flag is set, we have reset control register
304 if (!prm->data->rstctrl && !(prm->data->flags & OMAP_PRM_HAS_RSTCTRL))
307 /* Check if we have the pdata callbacks in place */
308 if (!pdata || !pdata->clkdm_lookup || !pdata->clkdm_deny_idle ||
309 !pdata->clkdm_allow_idle)
312 map = prm->data->rstmap;
316 reset = devm_kzalloc(&pdev->dev, sizeof(*reset), GFP_KERNEL);
320 reset->rcdev.owner = THIS_MODULE;
321 reset->rcdev.ops = &omap_reset_ops;
322 reset->rcdev.of_node = pdev->dev.of_node;
323 reset->rcdev.nr_resets = OMAP_MAX_RESETS;
324 reset->rcdev.of_xlate = omap_prm_reset_xlate;
325 reset->rcdev.of_reset_n_cells = 1;
326 reset->dev = &pdev->dev;
327 spin_lock_init(&reset->lock);
331 sprintf(buf, "%s_clkdm", prm->data->clkdm_name ? prm->data->clkdm_name :
334 if (!(prm->data->flags & OMAP_PRM_HAS_NO_CLKDM)) {
335 reset->clkdm = pdata->clkdm_lookup(buf);
340 while (map->rst >= 0) {
341 reset->mask |= BIT(map->rst);
345 return devm_reset_controller_register(&pdev->dev, &reset->rcdev);
348 static int omap_prm_probe(struct platform_device *pdev)
350 struct resource *res;
351 const struct omap_prm_data *data;
352 struct omap_prm *prm;
353 const struct of_device_id *match;
355 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
359 match = of_match_device(omap_prm_id_table, &pdev->dev);
363 prm = devm_kzalloc(&pdev->dev, sizeof(*prm), GFP_KERNEL);
369 while (data->base != res->start) {
377 prm->base = devm_ioremap_resource(&pdev->dev, res);
378 if (IS_ERR(prm->base))
379 return PTR_ERR(prm->base);
381 return omap_prm_reset_init(pdev, prm);
384 static struct platform_driver omap_prm_driver = {
385 .probe = omap_prm_probe,
387 .name = KBUILD_MODNAME,
388 .of_match_table = omap_prm_id_table,
391 builtin_platform_driver(omap_prm_driver);