1 /* $NetBSD: ti_prcm.c,v 1.4 2020/06/03 14:56:09 jmcneill Exp $ */
2
3 /*-
4 * Copyright (c) 2017 Jared McNeill <jmcneill@invisible.ca>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
22 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include <sys/cdefs.h>
30 __KERNEL_RCSID(0, "$NetBSD: ti_prcm.c,v 1.4 2020/06/03 14:56:09 jmcneill Exp $");
31
32 #include <sys/param.h>
33 #include <sys/bus.h>
34 #include <sys/cpu.h>
35 #include <sys/device.h>
36
37 #include <dev/fdt/fdtvar.h>
38
39 #include <dev/clk/clk_backend.h>
40
41 #define TI_PRCM_PRIVATE
42 #include <arm/ti/ti_prcm.h>
43
44 static struct ti_prcm_softc *prcm_softc = NULL;
45
46 static struct clk *
ti_prcm_clock_get(void * priv,const char * name)47 ti_prcm_clock_get(void *priv, const char *name)
48 {
49 struct ti_prcm_softc * const sc = priv;
50 struct ti_prcm_clk *clk;
51
52 clk = ti_prcm_clock_find(sc, name);
53 if (clk == NULL)
54 return NULL;
55
56 return &clk->base;
57 }
58
59 static void
ti_prcm_clock_put(void * priv,struct clk * clk)60 ti_prcm_clock_put(void *priv, struct clk *clk)
61 {
62 }
63
64 static u_int
ti_prcm_clock_get_rate(void * priv,struct clk * clkp)65 ti_prcm_clock_get_rate(void *priv, struct clk *clkp)
66 {
67 struct ti_prcm_softc * const sc = priv;
68 struct ti_prcm_clk *clk = (struct ti_prcm_clk *)clkp;
69 struct clk *clkp_parent;
70
71 if (clk->get_rate)
72 return clk->get_rate(sc, clk);
73
74 clkp_parent = clk_get_parent(clkp);
75 if (clkp_parent == NULL) {
76 aprint_error("%s: no parent for %s\n", __func__, clk->base.name);
77 return 0;
78 }
79
80 return clk_get_rate(clkp_parent);
81 }
82
83 static int
ti_prcm_clock_set_rate(void * priv,struct clk * clkp,u_int rate)84 ti_prcm_clock_set_rate(void *priv, struct clk *clkp, u_int rate)
85 {
86 struct ti_prcm_softc * const sc = priv;
87 struct ti_prcm_clk *clk = (struct ti_prcm_clk *)clkp;
88 struct clk *clkp_parent;
89
90 if (clkp->flags & CLK_SET_RATE_PARENT) {
91 clkp_parent = clk_get_parent(clkp);
92 if (clkp_parent == NULL) {
93 aprint_error("%s: no parent for %s\n", __func__, clk->base.name);
94 return ENXIO;
95 }
96 return clk_set_rate(clkp_parent, rate);
97 }
98
99 if (clk->set_rate)
100 return clk->set_rate(sc, clk, rate);
101
102 return ENXIO;
103 }
104
105 static int
ti_prcm_clock_enable(void * priv,struct clk * clkp)106 ti_prcm_clock_enable(void *priv, struct clk *clkp)
107 {
108 struct ti_prcm_softc * const sc = priv;
109 struct ti_prcm_clk *clk = (struct ti_prcm_clk *)clkp;
110 struct clk *clkp_parent;
111 int error = 0;
112
113 clkp_parent = clk_get_parent(clkp);
114 if (clkp_parent != NULL) {
115 error = clk_enable(clkp_parent);
116 if (error != 0)
117 return error;
118 }
119
120 if (clk->enable)
121 error = clk->enable(sc, clk, 1);
122
123 return error;
124 }
125
126 static int
ti_prcm_clock_disable(void * priv,struct clk * clkp)127 ti_prcm_clock_disable(void *priv, struct clk *clkp)
128 {
129 struct ti_prcm_softc * const sc = priv;
130 struct ti_prcm_clk *clk = (struct ti_prcm_clk *)clkp;
131 int error = EINVAL;
132
133 if (clk->enable)
134 error = clk->enable(sc, clk, 0);
135
136 return error;
137 }
138
139 static int
ti_prcm_clock_set_parent(void * priv,struct clk * clkp,struct clk * clkp_parent)140 ti_prcm_clock_set_parent(void *priv, struct clk *clkp,
141 struct clk *clkp_parent)
142 {
143 struct ti_prcm_softc * const sc = priv;
144 struct ti_prcm_clk *clk = (struct ti_prcm_clk *)clkp;
145
146 if (clk->set_parent == NULL)
147 return EINVAL;
148
149 return clk->set_parent(sc, clk, clkp_parent->name);
150 }
151
152 static struct clk *
ti_prcm_clock_get_parent(void * priv,struct clk * clkp)153 ti_prcm_clock_get_parent(void *priv, struct clk *clkp)
154 {
155 struct ti_prcm_softc * const sc = priv;
156 struct ti_prcm_clk *clk = (struct ti_prcm_clk *)clkp;
157 struct ti_prcm_clk *clk_parent;
158 const char *parent;
159
160 if (clk->get_parent == NULL)
161 return NULL;
162
163 parent = clk->get_parent(sc, clk);
164 if (parent == NULL)
165 return NULL;
166
167 clk_parent = ti_prcm_clock_find(sc, parent);
168 if (clk_parent != NULL)
169 return &clk_parent->base;
170
171 /* No parent in this domain, try FDT */
172 return fdtbus_clock_get(sc->sc_phandle, parent);
173 }
174
175 static const struct clk_funcs ti_prcm_clock_funcs = {
176 .get = ti_prcm_clock_get,
177 .put = ti_prcm_clock_put,
178 .get_rate = ti_prcm_clock_get_rate,
179 .set_rate = ti_prcm_clock_set_rate,
180 .enable = ti_prcm_clock_enable,
181 .disable = ti_prcm_clock_disable,
182 .set_parent = ti_prcm_clock_set_parent,
183 .get_parent = ti_prcm_clock_get_parent,
184 };
185
186 struct ti_prcm_clk *
ti_prcm_clock_find(struct ti_prcm_softc * sc,const char * name)187 ti_prcm_clock_find(struct ti_prcm_softc *sc, const char *name)
188 {
189 for (int i = 0; i < sc->sc_nclks; i++) {
190 if (sc->sc_clks[i].base.name == NULL)
191 continue;
192 if (strcmp(sc->sc_clks[i].base.name, name) == 0)
193 return &sc->sc_clks[i];
194 }
195
196 return NULL;
197 }
198
199 int
ti_prcm_attach(struct ti_prcm_softc * sc)200 ti_prcm_attach(struct ti_prcm_softc *sc)
201 {
202 bus_addr_t addr;
203 bus_size_t size;
204 int i;
205
206 if (fdtbus_get_reg(sc->sc_phandle, 0, &addr, &size) != 0) {
207 aprint_error(": couldn't get registers\n");
208 return ENXIO;
209 }
210 if (bus_space_map(sc->sc_bst, addr, size, 0, &sc->sc_bsh) != 0) {
211 aprint_error(": couldn't map registers\n");
212 return ENXIO;
213 }
214
215 sc->sc_clkdom.funcs = &ti_prcm_clock_funcs;
216 sc->sc_clkdom.priv = sc;
217 for (i = 0; i < sc->sc_nclks; i++)
218 sc->sc_clks[i].base.domain = &sc->sc_clkdom;
219
220 KASSERT(prcm_softc == NULL);
221 prcm_softc = sc;
222
223 return 0;
224 }
225
226 struct clk *
ti_prcm_get_hwmod(const int phandle,u_int index)227 ti_prcm_get_hwmod(const int phandle, u_int index)
228 {
229 struct ti_prcm_clk *tc;
230 const char *hwmods, *p;
231 int len, resid, hwmod_phandle;
232 u_int n;
233
234 KASSERTMSG(prcm_softc != NULL, "prcm driver not attached");
235
236 /* If this node does not have a ti,hwmods property, try the parent */
237 hwmod_phandle = of_hasprop(phandle, "ti,hwmods") ? phandle : OF_parent(phandle);
238
239 /* Lookup clock by "ti,hwmods" name (old method) */
240 hwmods = fdtbus_get_prop(hwmod_phandle, "ti,hwmods", &len);
241 if (len > 0) {
242 p = hwmods;
243 for (n = 0, resid = len; resid > 0; n++) {
244 if (n == index) {
245 tc = ti_prcm_clock_find(prcm_softc, p);
246 if (tc == NULL) {
247 aprint_error_dev(prcm_softc->sc_dev,
248 "no hwmod with name '%s'\n", p);
249 return NULL;
250 }
251 KASSERT(tc->type == TI_PRCM_HWMOD);
252 return &tc->base;
253 }
254 resid -= strlen(p);
255 p += strlen(p) + 1;
256 }
257 }
258
259 /* Find clock resource */
260 return fdtbus_clock_get_index(hwmod_phandle, index);
261 }
262
263 int
ti_prcm_enable_hwmod(const int phandle,u_int index)264 ti_prcm_enable_hwmod(const int phandle, u_int index)
265 {
266 struct clk *clk;
267
268 clk = ti_prcm_get_hwmod(phandle, index);
269 if (clk == NULL)
270 return ENOENT;
271
272 return clk_enable(clk);
273 }
274