xref: /openbmc/linux/arch/arm/mach-mxs/mach-mxs.c (revision b830f94f) 
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * Copyright 2012 Freescale Semiconductor, Inc.
4  * Copyright 2012 Linaro Ltd.
5  */
6 
7 #include <linux/clk.h>
8 #include <linux/clk/mxs.h>
9 #include <linux/clkdev.h>
10 #include <linux/delay.h>
11 #include <linux/err.h>
12 #include <linux/gpio.h>
13 #include <linux/init.h>
14 #include <linux/irqchip/mxs.h>
15 #include <linux/reboot.h>
16 #include <linux/micrel_phy.h>
17 #include <linux/of_address.h>
18 #include <linux/of_platform.h>
19 #include <linux/phy.h>
20 #include <linux/pinctrl/consumer.h>
21 #include <linux/sys_soc.h>
22 #include <asm/mach/arch.h>
23 #include <asm/mach/map.h>
24 #include <asm/mach/time.h>
25 #include <asm/system_misc.h>
26 
27 #include "pm.h"
28 
29 /* MXS DIGCTL SAIF CLKMUX */
30 #define MXS_DIGCTL_SAIF_CLKMUX_DIRECT		0x0
31 #define MXS_DIGCTL_SAIF_CLKMUX_CROSSINPUT	0x1
32 #define MXS_DIGCTL_SAIF_CLKMUX_EXTMSTR0		0x2
33 #define MXS_DIGCTL_SAIF_CLKMUX_EXTMSTR1		0x3
34 
35 #define HW_DIGCTL_CHIPID	0x310
36 #define HW_DIGCTL_CHIPID_MASK	(0xffff << 16)
37 #define HW_DIGCTL_REV_MASK	0xff
38 #define HW_DIGCTL_CHIPID_MX23	(0x3780 << 16)
39 #define HW_DIGCTL_CHIPID_MX28	(0x2800 << 16)
40 
41 #define MXS_CHIP_REVISION_1_0	0x10
42 #define MXS_CHIP_REVISION_1_1	0x11
43 #define MXS_CHIP_REVISION_1_2	0x12
44 #define MXS_CHIP_REVISION_1_3	0x13
45 #define MXS_CHIP_REVISION_1_4	0x14
46 #define MXS_CHIP_REV_UNKNOWN	0xff
47 
48 #define MXS_GPIO_NR(bank, nr)	((bank) * 32 + (nr))
49 
50 #define MXS_SET_ADDR		0x4
51 #define MXS_CLR_ADDR		0x8
52 #define MXS_TOG_ADDR		0xc
53 
54 static u32 chipid;
55 static u32 socid;
56 
57 static void __iomem *reset_addr;
58 
59 static inline void __mxs_setl(u32 mask, void __iomem *reg)
60 {
61 	__raw_writel(mask, reg + MXS_SET_ADDR);
62 }
63 
64 static inline void __mxs_clrl(u32 mask, void __iomem *reg)
65 {
66 	__raw_writel(mask, reg + MXS_CLR_ADDR);
67 }
68 
69 static inline void __mxs_togl(u32 mask, void __iomem *reg)
70 {
71 	__raw_writel(mask, reg + MXS_TOG_ADDR);
72 }
73 
74 #define OCOTP_WORD_OFFSET		0x20
75 #define OCOTP_WORD_COUNT		0x20
76 
77 #define BM_OCOTP_CTRL_BUSY		(1 << 8)
78 #define BM_OCOTP_CTRL_ERROR		(1 << 9)
79 #define BM_OCOTP_CTRL_RD_BANK_OPEN	(1 << 12)
80 
81 static DEFINE_MUTEX(ocotp_mutex);
82 static u32 ocotp_words[OCOTP_WORD_COUNT];
83 
84 static const u32 *mxs_get_ocotp(void)
85 {
86 	struct device_node *np;
87 	void __iomem *ocotp_base;
88 	int timeout = 0x400;
89 	size_t i;
90 	static int once;
91 
92 	if (once)
93 		return ocotp_words;
94 
95 	np = of_find_compatible_node(NULL, NULL, "fsl,ocotp");
96 	ocotp_base = of_iomap(np, 0);
97 	WARN_ON(!ocotp_base);
98 
99 	mutex_lock(&ocotp_mutex);
100 
101 	/*
102 	 * clk_enable(hbus_clk) for ocotp can be skipped
103 	 * as it must be on when system is running.
104 	 */
105 
106 	/* try to clear ERROR bit */
107 	__mxs_clrl(BM_OCOTP_CTRL_ERROR, ocotp_base);
108 
109 	/* check both BUSY and ERROR cleared */
110 	while ((__raw_readl(ocotp_base) &
111 		(BM_OCOTP_CTRL_BUSY | BM_OCOTP_CTRL_ERROR)) && --timeout)
112 		cpu_relax();
113 
114 	if (unlikely(!timeout))
115 		goto error_unlock;
116 
117 	/* open OCOTP banks for read */
118 	__mxs_setl(BM_OCOTP_CTRL_RD_BANK_OPEN, ocotp_base);
119 
120 	/* approximately wait 32 hclk cycles */
121 	udelay(1);
122 
123 	/* poll BUSY bit becoming cleared */
124 	timeout = 0x400;
125 	while ((__raw_readl(ocotp_base) & BM_OCOTP_CTRL_BUSY) && --timeout)
126 		cpu_relax();
127 
128 	if (unlikely(!timeout))
129 		goto error_unlock;
130 
131 	for (i = 0; i < OCOTP_WORD_COUNT; i++)
132 		ocotp_words[i] = __raw_readl(ocotp_base + OCOTP_WORD_OFFSET +
133 						i * 0x10);
134 
135 	/* close banks for power saving */
136 	__mxs_clrl(BM_OCOTP_CTRL_RD_BANK_OPEN, ocotp_base);
137 
138 	once = 1;
139 
140 	mutex_unlock(&ocotp_mutex);
141 
142 	return ocotp_words;
143 
144 error_unlock:
145 	mutex_unlock(&ocotp_mutex);
146 	pr_err("%s: timeout in reading OCOTP\n", __func__);
147 	return NULL;
148 }
149 
150 enum mac_oui {
151 	OUI_FSL,
152 	OUI_DENX,
153 	OUI_CRYSTALFONTZ,
154 	OUI_I2SE,
155 	OUI_ARMADEUS,
156 };
157 
158 static void __init update_fec_mac_prop(enum mac_oui oui)
159 {
160 	struct device_node *np, *from = NULL;
161 	struct property *newmac;
162 	const u32 *ocotp = mxs_get_ocotp();
163 	u8 *macaddr;
164 	u32 val;
165 	int i;
166 
167 	for (i = 0; i < 2; i++) {
168 		np = of_find_compatible_node(from, NULL, "fsl,imx28-fec");
169 		if (!np)
170 			return;
171 
172 		from = np;
173 
174 		if (of_get_property(np, "local-mac-address", NULL))
175 			continue;
176 
177 		newmac = kzalloc(sizeof(*newmac) + 6, GFP_KERNEL);
178 		if (!newmac)
179 			return;
180 		newmac->value = newmac + 1;
181 		newmac->length = 6;
182 
183 		newmac->name = kstrdup("local-mac-address", GFP_KERNEL);
184 		if (!newmac->name) {
185 			kfree(newmac);
186 			return;
187 		}
188 
189 		/*
190 		 * OCOTP only stores the last 4 octets for each mac address,
191 		 * so hard-code OUI here.
192 		 */
193 		macaddr = newmac->value;
194 		switch (oui) {
195 		case OUI_FSL:
196 			macaddr[0] = 0x00;
197 			macaddr[1] = 0x04;
198 			macaddr[2] = 0x9f;
199 			break;
200 		case OUI_DENX:
201 			macaddr[0] = 0xc0;
202 			macaddr[1] = 0xe5;
203 			macaddr[2] = 0x4e;
204 			break;
205 		case OUI_CRYSTALFONTZ:
206 			macaddr[0] = 0x58;
207 			macaddr[1] = 0xb9;
208 			macaddr[2] = 0xe1;
209 			break;
210 		case OUI_I2SE:
211 			macaddr[0] = 0x00;
212 			macaddr[1] = 0x01;
213 			macaddr[2] = 0x87;
214 			break;
215 		case OUI_ARMADEUS:
216 			macaddr[0] = 0x00;
217 			macaddr[1] = 0x1e;
218 			macaddr[2] = 0xac;
219 			break;
220 		}
221 		val = ocotp[i];
222 		macaddr[3] = (val >> 16) & 0xff;
223 		macaddr[4] = (val >> 8) & 0xff;
224 		macaddr[5] = (val >> 0) & 0xff;
225 
226 		of_update_property(np, newmac);
227 	}
228 }
229 
230 static inline void enable_clk_enet_out(void)
231 {
232 	struct clk *clk = clk_get_sys("enet_out", NULL);
233 
234 	if (!IS_ERR(clk))
235 		clk_prepare_enable(clk);
236 }
237 
238 static void __init imx28_evk_init(void)
239 {
240 	update_fec_mac_prop(OUI_FSL);
241 
242 	mxs_saif_clkmux_select(MXS_DIGCTL_SAIF_CLKMUX_EXTMSTR0);
243 }
244 
245 static void __init imx28_apf28_init(void)
246 {
247 	update_fec_mac_prop(OUI_ARMADEUS);
248 }
249 
250 static int apx4devkit_phy_fixup(struct phy_device *phy)
251 {
252 	phy->dev_flags |= MICREL_PHY_50MHZ_CLK;
253 	return 0;
254 }
255 
256 static void __init apx4devkit_init(void)
257 {
258 	enable_clk_enet_out();
259 
260 	if (IS_BUILTIN(CONFIG_PHYLIB))
261 		phy_register_fixup_for_uid(PHY_ID_KSZ8051, MICREL_PHY_ID_MASK,
262 					   apx4devkit_phy_fixup);
263 }
264 
265 static void __init crystalfontz_init(void)
266 {
267 	update_fec_mac_prop(OUI_CRYSTALFONTZ);
268 }
269 
270 static void __init duckbill_init(void)
271 {
272 	update_fec_mac_prop(OUI_I2SE);
273 }
274 
275 static void __init m28cu3_init(void)
276 {
277 	update_fec_mac_prop(OUI_DENX);
278 }
279 
280 static const char __init *mxs_get_soc_id(void)
281 {
282 	struct device_node *np;
283 	void __iomem *digctl_base;
284 
285 	np = of_find_compatible_node(NULL, NULL, "fsl,imx23-digctl");
286 	digctl_base = of_iomap(np, 0);
287 	WARN_ON(!digctl_base);
288 
289 	chipid = readl(digctl_base + HW_DIGCTL_CHIPID);
290 	socid = chipid & HW_DIGCTL_CHIPID_MASK;
291 
292 	iounmap(digctl_base);
293 	of_node_put(np);
294 
295 	switch (socid) {
296 	case HW_DIGCTL_CHIPID_MX23:
297 		return "i.MX23";
298 	case HW_DIGCTL_CHIPID_MX28:
299 		return "i.MX28";
300 	default:
301 		return "Unknown";
302 	}
303 }
304 
305 static u32 __init mxs_get_cpu_rev(void)
306 {
307 	u32 rev = chipid & HW_DIGCTL_REV_MASK;
308 
309 	switch (socid) {
310 	case HW_DIGCTL_CHIPID_MX23:
311 		switch (rev) {
312 		case 0x0:
313 			return MXS_CHIP_REVISION_1_0;
314 		case 0x1:
315 			return MXS_CHIP_REVISION_1_1;
316 		case 0x2:
317 			return MXS_CHIP_REVISION_1_2;
318 		case 0x3:
319 			return MXS_CHIP_REVISION_1_3;
320 		case 0x4:
321 			return MXS_CHIP_REVISION_1_4;
322 		default:
323 			return MXS_CHIP_REV_UNKNOWN;
324 		}
325 	case HW_DIGCTL_CHIPID_MX28:
326 		switch (rev) {
327 		case 0x0:
328 			return MXS_CHIP_REVISION_1_1;
329 		case 0x1:
330 			return MXS_CHIP_REVISION_1_2;
331 		default:
332 			return MXS_CHIP_REV_UNKNOWN;
333 		}
334 	default:
335 		return MXS_CHIP_REV_UNKNOWN;
336 	}
337 }
338 
339 static const char __init *mxs_get_revision(void)
340 {
341 	u32 rev = mxs_get_cpu_rev();
342 
343 	if (rev != MXS_CHIP_REV_UNKNOWN)
344 		return kasprintf(GFP_KERNEL, "%d.%d", (rev >> 4) & 0xf,
345 				rev & 0xf);
346 	else
347 		return kasprintf(GFP_KERNEL, "%s", "Unknown");
348 }
349 
350 #define MX23_CLKCTRL_RESET_OFFSET	0x120
351 #define MX28_CLKCTRL_RESET_OFFSET	0x1e0
352 
353 static int __init mxs_restart_init(void)
354 {
355 	struct device_node *np;
356 
357 	np = of_find_compatible_node(NULL, NULL, "fsl,clkctrl");
358 	reset_addr = of_iomap(np, 0);
359 	if (!reset_addr)
360 		return -ENODEV;
361 
362 	if (of_device_is_compatible(np, "fsl,imx23-clkctrl"))
363 		reset_addr += MX23_CLKCTRL_RESET_OFFSET;
364 	else
365 		reset_addr += MX28_CLKCTRL_RESET_OFFSET;
366 	of_node_put(np);
367 
368 	return 0;
369 }
370 
371 static void __init eukrea_mbmx283lc_init(void)
372 {
373 	mxs_saif_clkmux_select(MXS_DIGCTL_SAIF_CLKMUX_EXTMSTR0);
374 }
375 
376 static void __init mxs_machine_init(void)
377 {
378 	struct device_node *root;
379 	struct device *parent;
380 	struct soc_device *soc_dev;
381 	struct soc_device_attribute *soc_dev_attr;
382 	int ret;
383 
384 	soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
385 	if (!soc_dev_attr)
386 		return;
387 
388 	root = of_find_node_by_path("/");
389 	ret = of_property_read_string(root, "model", &soc_dev_attr->machine);
390 	if (ret)
391 		return;
392 
393 	soc_dev_attr->family = "Freescale MXS Family";
394 	soc_dev_attr->soc_id = mxs_get_soc_id();
395 	soc_dev_attr->revision = mxs_get_revision();
396 
397 	soc_dev = soc_device_register(soc_dev_attr);
398 	if (IS_ERR(soc_dev)) {
399 		kfree(soc_dev_attr->revision);
400 		kfree(soc_dev_attr);
401 		return;
402 	}
403 
404 	parent = soc_device_to_device(soc_dev);
405 
406 	if (of_machine_is_compatible("fsl,imx28-evk"))
407 		imx28_evk_init();
408 	if (of_machine_is_compatible("armadeus,imx28-apf28"))
409 		imx28_apf28_init();
410 	else if (of_machine_is_compatible("bluegiga,apx4devkit"))
411 		apx4devkit_init();
412 	else if (of_machine_is_compatible("crystalfontz,cfa10036"))
413 		crystalfontz_init();
414 	else if (of_machine_is_compatible("eukrea,mbmx283lc"))
415 		eukrea_mbmx283lc_init();
416 	else if (of_machine_is_compatible("i2se,duckbill") ||
417 		 of_machine_is_compatible("i2se,duckbill-2"))
418 		duckbill_init();
419 	else if (of_machine_is_compatible("msr,m28cu3"))
420 		m28cu3_init();
421 
422 	of_platform_default_populate(NULL, NULL, parent);
423 
424 	mxs_restart_init();
425 }
426 
427 #define MXS_CLKCTRL_RESET_CHIP		(1 << 1)
428 
429 /*
430  * Reset the system. It is called by machine_restart().
431  */
432 static void mxs_restart(enum reboot_mode mode, const char *cmd)
433 {
434 	if (reset_addr) {
435 		/* reset the chip */
436 		__mxs_setl(MXS_CLKCTRL_RESET_CHIP, reset_addr);
437 
438 		pr_err("Failed to assert the chip reset\n");
439 
440 		/* Delay to allow the serial port to show the message */
441 		mdelay(50);
442 	}
443 
444 	/* We'll take a jump through zero as a poor second */
445 	soft_restart(0);
446 }
447 
448 static const char *const mxs_dt_compat[] __initconst = {
449 	"fsl,imx28",
450 	"fsl,imx23",
451 	NULL,
452 };
453 
454 DT_MACHINE_START(MXS, "Freescale MXS (Device Tree)")
455 	.handle_irq	= icoll_handle_irq,
456 	.init_machine	= mxs_machine_init,
457 	.init_late      = mxs_pm_init,
458 	.dt_compat	= mxs_dt_compat,
459 	.restart	= mxs_restart,
460 MACHINE_END
461