1 /*-
2 * Copyright (c) 2013 Ian Lepore <ian@freebsd.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27 #include "opt_platform.h"
28
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD: releng/11.0/sys/arm/freescale/imx/imx6_machdep.c 298854 2016-04-30 17:27:33Z andrew $");
31
32 #include <sys/param.h>
33 #include <sys/systm.h>
34 #include <sys/bus.h>
35 #include <sys/reboot.h>
36 #include <sys/devmap.h>
37
38 #include <vm/vm.h>
39
40 #include <machine/bus.h>
41 #include <machine/intr.h>
42 #include <machine/machdep.h>
43 #include <machine/platformvar.h>
44
45 #include <arm/arm/mpcore_timervar.h>
46 #include <arm/freescale/imx/imx6_anatopreg.h>
47 #include <arm/freescale/imx/imx6_anatopvar.h>
48 #include <arm/freescale/imx/imx_machdep.h>
49
50 #include <dev/fdt/fdt_common.h>
51 #include <dev/ofw/openfirm.h>
52
53 #include "platform_if.h"
54
55 struct fdt_fixup_entry fdt_fixup_table[] = {
56 { NULL, NULL }
57 };
58
59 static uint32_t gpio1_node;
60
61 #ifndef INTRNG
62 /*
63 * Work around the linux workaround for imx6 erratum 006687, in which some
64 * ethernet interrupts don't go to the GPC and thus won't wake the system from
65 * Wait mode. We don't use Wait mode (which halts the GIC, leaving only GPC
66 * interrupts able to wake the system), so we don't experience the bug at all.
67 * The linux workaround is to reconfigure GPIO1_6 as the ENET interrupt by
68 * writing magic values to an undocumented IOMUX register, then letting the gpio
69 * interrupt driver notify the ethernet driver. We'll be able to do all that
70 * (even though we don't need to) once the INTRNG project is committed and the
71 * imx_gpio driver becomes an interrupt driver. Until then, this crazy little
72 * workaround watches for requests to map an interrupt 6 with the interrupt
73 * controller node referring to gpio1, and it substitutes the proper ffec
74 * interrupt number.
75 */
76 static int
77 imx6_decode_fdt(uint32_t iparent, uint32_t *intr, int *interrupt,
78 int *trig, int *pol)
79 {
80
81 if (fdt32_to_cpu(intr[0]) == 6 &&
82 OF_node_from_xref(iparent) == gpio1_node) {
83 *interrupt = 150;
84 *trig = INTR_TRIGGER_CONFORM;
85 *pol = INTR_POLARITY_CONFORM;
86 return (0);
87 }
88 return (gic_decode_fdt(iparent, intr, interrupt, trig, pol));
89 }
90
91 fdt_pic_decode_t fdt_pic_table[] = {
92 &imx6_decode_fdt,
93 NULL
94 };
95 #endif
96
97 /*
98 * Fix FDT data related to interrupts.
99 *
100 * Driven by the needs of linux and its drivers (as always), the published FDT
101 * data for imx6 now sets the interrupt parent for most devices to the GPC
102 * interrupt controller, which is for use when the chip is in deep-sleep mode.
103 * We don't support deep sleep or have a GPC-PIC driver; we need all interrupts
104 * to be handled by the GIC.
105 *
106 * Luckily, the change to the FDT data was to assign the GPC as the interrupt
107 * parent for the soc node and letting that get inherited by all other devices
108 * (except a few that directly name GIC as their interrupt parent). So we can
109 * set the world right by just changing the interrupt-parent property of the soc
110 * node to refer to GIC instead of GPC. This will get us by until we write our
111 * own GPC driver (or until linux changes its mind and the FDT data again).
112 *
113 * We validate that we have data that looks like we expect before changing it:
114 * - SOC node exists and has GPC as its interrupt parent.
115 * - GPC node exists and has GIC as its interrupt parent.
116 * - GIC node exists and is its own interrupt parent.
117 *
118 * This applies to all models of imx6. Luckily all of them have the devices
119 * involved at the same addresses on the same busses, so we don't need any
120 * per-soc logic. We handle this at platform attach time rather than via the
121 * fdt_fixup_table, because the latter requires matching on the FDT "model"
122 * property, and this applies to all boards including those not yet invented.
123 */
124 static void
125 fix_fdt_interrupt_data(void)
126 {
127 phandle_t gicipar, gicnode, gicxref;
128 phandle_t gpcipar, gpcnode, gpcxref;
129 phandle_t socipar, socnode;
130 int result;
131
132 socnode = OF_finddevice("/soc");
133 if (socnode == -1)
134 return;
135 result = OF_getencprop(socnode, "interrupt-parent", &socipar,
136 sizeof(socipar));
137 if (result <= 0)
138 return;
139
140 gicnode = OF_finddevice("/soc/interrupt-controller@00a01000");
141 if (gicnode == -1)
142 return;
143 result = OF_getencprop(gicnode, "interrupt-parent", &gicipar,
144 sizeof(gicipar));
145 if (result <= 0)
146 return;
147 gicxref = OF_xref_from_node(gicnode);
148
149 gpcnode = OF_finddevice("/soc/aips-bus@02000000/gpc@020dc000");
150 if (gpcnode == -1)
151 return;
152 result = OF_getencprop(gpcnode, "interrupt-parent", &gpcipar,
153 sizeof(gpcipar));
154 if (result <= 0)
155 return;
156 gpcxref = OF_xref_from_node(gpcnode);
157
158 if (socipar != gpcxref || gpcipar != gicxref || gicipar != gicxref)
159 return;
160
161 gicxref = cpu_to_fdt32(gicxref);
162 OF_setprop(socnode, "interrupt-parent", &gicxref, sizeof(gicxref));
163 }
164
165 static vm_offset_t
166 imx6_lastaddr(platform_t plat)
167 {
168
169 return (devmap_lastaddr());
170 }
171
172 static int
173 imx6_attach(platform_t plat)
174 {
175
176 /* Fix soc interrupt-parent property. */
177 fix_fdt_interrupt_data();
178
179 /* Inform the MPCore timer driver that its clock is variable. */
180 arm_tmr_change_frequency(ARM_TMR_FREQUENCY_VARIES);
181
182 return (0);
183 }
184
185 static void
186 imx6_late_init(platform_t plat)
187 {
188 const uint32_t IMX6_WDOG_SR_PHYS = 0x020bc004;
189
190 imx_wdog_init_last_reset(IMX6_WDOG_SR_PHYS);
191
192 /* Cache the gpio1 node handle for imx6_decode_fdt() workaround code. */
193 gpio1_node = OF_node_from_xref(
194 OF_finddevice("/soc/aips-bus@02000000/gpio@0209c000"));
195 }
196
197 /*
198 * Set up static device mappings.
199 *
200 * This attempts to cover the most-used devices with 1MB section mappings, which
201 * is good for performance (uses fewer TLB entries for device access).
202 *
203 * ARMMP covers the interrupt controller, MPCore timers, global timer, and the
204 * L2 cache controller. Most of the 1MB range is unused reserved space.
205 *
206 * AIPS1/AIPS2 cover most of the on-chip devices such as uart, spi, i2c, etc.
207 *
208 * Notably not mapped right now are HDMI, GPU, and other devices below ARMMP in
209 * the memory map. When we get support for graphics it might make sense to
210 * static map some of that area. Be careful with other things in that area such
211 * as OCRAM that probably shouldn't be mapped as VM_MEMATTR_DEVICE memory.
212 */
213 static int
214 imx6_devmap_init(platform_t plat)
215 {
216 const uint32_t IMX6_ARMMP_PHYS = 0x00a00000;
217 const uint32_t IMX6_ARMMP_SIZE = 0x00100000;
218 const uint32_t IMX6_AIPS1_PHYS = 0x02000000;
219 const uint32_t IMX6_AIPS1_SIZE = 0x00100000;
220 const uint32_t IMX6_AIPS2_PHYS = 0x02100000;
221 const uint32_t IMX6_AIPS2_SIZE = 0x00100000;
222
223 devmap_add_entry(IMX6_ARMMP_PHYS, IMX6_ARMMP_SIZE);
224 devmap_add_entry(IMX6_AIPS1_PHYS, IMX6_AIPS1_SIZE);
225 devmap_add_entry(IMX6_AIPS2_PHYS, IMX6_AIPS2_SIZE);
226
227 return (0);
228 }
229
230 void
231 cpu_reset(void)
232 {
233 const uint32_t IMX6_WDOG_CR_PHYS = 0x020bc000;
234
235 imx_wdog_cpu_reset(IMX6_WDOG_CR_PHYS);
236 }
237
238 /*
239 * Determine what flavor of imx6 we're running on.
240 *
241 * This code is based on the way u-boot does it. Information found on the web
242 * indicates that Freescale themselves were the original source of this logic,
243 * including the strange check for number of CPUs in the SCU configuration
244 * register, which is apparently needed on some revisions of the SOLO.
245 *
246 * According to the documentation, there is such a thing as an i.MX6 Dual
247 * (non-lite flavor). However, Freescale doesn't seem to have assigned it a
248 * number or provided any logic to handle it in their detection code.
249 *
250 * Note that the ANALOG_DIGPROG and SCU configuration registers are not
251 * documented in the chip reference manual. (SCU configuration is mentioned,
252 * but not mapped out in detail.) I think the bottom two bits of the scu config
253 * register may be ncpu-1.
254 *
255 * This hasn't been tested yet on a dual[-lite].
256 *
257 * On a solo:
258 * digprog = 0x00610001
259 * hwsoc = 0x00000062
260 * scu config = 0x00000500
261 * On a quad:
262 * digprog = 0x00630002
263 * hwsoc = 0x00000063
264 * scu config = 0x00005503
265 */
266 u_int imx_soc_type()
267 {
268 uint32_t digprog, hwsoc;
269 uint32_t *pcr;
270 static u_int soctype;
271 const vm_offset_t SCU_CONFIG_PHYSADDR = 0x00a00004;
272 #define HWSOC_MX6SL 0x60
273 #define HWSOC_MX6DL 0x61
274 #define HWSOC_MX6SOLO 0x62
275 #define HWSOC_MX6Q 0x63
276
277 if (soctype != 0)
278 return (soctype);
279
280 digprog = imx6_anatop_read_4(IMX6_ANALOG_DIGPROG_SL);
281 hwsoc = (digprog >> IMX6_ANALOG_DIGPROG_SOCTYPE_SHIFT) &
282 IMX6_ANALOG_DIGPROG_SOCTYPE_MASK;
283
284 if (hwsoc != HWSOC_MX6SL) {
285 digprog = imx6_anatop_read_4(IMX6_ANALOG_DIGPROG);
286 hwsoc = (digprog & IMX6_ANALOG_DIGPROG_SOCTYPE_MASK) >>
287 IMX6_ANALOG_DIGPROG_SOCTYPE_SHIFT;
288 /*printf("digprog = 0x%08x\n", digprog);*/
289 if (hwsoc == HWSOC_MX6DL) {
290 pcr = devmap_ptov(SCU_CONFIG_PHYSADDR, 4);
291 if (pcr != NULL) {
292 /*printf("scu config = 0x%08x\n", *pcr);*/
293 if ((*pcr & 0x03) == 0) {
294 hwsoc = HWSOC_MX6SOLO;
295 }
296 }
297 }
298 }
299 /* printf("hwsoc 0x%08x\n", hwsoc); */
300
301 switch (hwsoc) {
302 case HWSOC_MX6SL:
303 soctype = IMXSOC_6SL;
304 break;
305 case HWSOC_MX6SOLO:
306 soctype = IMXSOC_6S;
307 break;
308 case HWSOC_MX6DL:
309 soctype = IMXSOC_6DL;
310 break;
311 case HWSOC_MX6Q :
312 soctype = IMXSOC_6Q;
313 break;
314 default:
315 printf("imx_soc_type: Don't understand hwsoc 0x%02x, "
316 "digprog 0x%08x; assuming IMXSOC_6Q\n", hwsoc, digprog);
317 soctype = IMXSOC_6Q;
318 break;
319 }
320
321 return (soctype);
322 }
323
324 /*
325 * Early putc routine for EARLY_PRINTF support. To use, add to kernel config:
326 * option SOCDEV_PA=0x02000000
327 * option SOCDEV_VA=0x02000000
328 * option EARLY_PRINTF
329 * Resist the temptation to change the #if 0 to #ifdef EARLY_PRINTF here. It
330 * makes sense now, but if multiple SOCs do that it will make early_putc another
331 * duplicate symbol to be eliminated on the path to a generic kernel.
332 */
333 #if 0
334 static void
335 imx6_early_putc(int c)
336 {
337 volatile uint32_t * UART_STAT_REG = (uint32_t *)0x02020098;
338 volatile uint32_t * UART_TX_REG = (uint32_t *)0x02020040;
339 const uint32_t UART_TXRDY = (1 << 3);
340
341 while ((*UART_STAT_REG & UART_TXRDY) == 0)
342 continue;
343 *UART_TX_REG = c;
344 }
345 early_putc_t *early_putc = imx6_early_putc;
346 #endif
347
348 static platform_method_t imx6_methods[] = {
349 PLATFORMMETHOD(platform_attach, imx6_attach),
350 PLATFORMMETHOD(platform_lastaddr, imx6_lastaddr),
351 PLATFORMMETHOD(platform_devmap_init, imx6_devmap_init),
352 PLATFORMMETHOD(platform_late_init, imx6_late_init),
353
354 PLATFORMMETHOD_END,
355 };
356
357 FDT_PLATFORM_DEF2(imx6, imx6s, "i.MX6 Solo", 0, "fsl,imx6s", 0);
358 FDT_PLATFORM_DEF2(imx6, imx6d, "i.MX6 Dual", 0, "fsl,imx6d", 0);
359 FDT_PLATFORM_DEF2(imx6, imx6q, "i.MX6 Quad", 0, "fsl,imx6q", 0);
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