1 /*
2  * P1022DS board specific routines
3  *
4  * Authors: Travis Wheatley <travis.wheatley@freescale.com>
5  *          Dave Liu <daveliu@freescale.com>
6  *          Timur Tabi <timur@freescale.com>
7  *
8  * Copyright 2010 Freescale Semiconductor, Inc.
9  *
10  * This file is taken from the Freescale P1022DS BSP, with modifications:
11  * 2) No AMP support
12  * 3) No PCI endpoint support
13  *
14  * This file is licensed under the terms of the GNU General Public License
15  * version 2.  This program is licensed "as is" without any warranty of any
16  * kind, whether express or implied.
17  */
18 
19 #include <linux/fsl/guts.h>
20 #include <linux/pci.h>
21 #include <linux/of_platform.h>
22 #include <asm/div64.h>
23 #include <asm/mpic.h>
24 #include <asm/swiotlb.h>
25 
26 #include <sysdev/fsl_soc.h>
27 #include <sysdev/fsl_pci.h>
28 #include <asm/udbg.h>
29 #include <asm/fsl_lbc.h>
30 #include "smp.h"
31 
32 #include "mpc85xx.h"
33 
34 #if defined(CONFIG_FB_FSL_DIU) || defined(CONFIG_FB_FSL_DIU_MODULE)
35 
36 #define PMUXCR_ELBCDIU_MASK	0xc0000000
37 #define PMUXCR_ELBCDIU_NOR16	0x80000000
38 #define PMUXCR_ELBCDIU_DIU	0x40000000
39 
40 /*
41  * Board-specific initialization of the DIU.  This code should probably be
42  * executed when the DIU is opened, rather than in arch code, but the DIU
43  * driver does not have a mechanism for this (yet).
44  *
45  * This is especially problematic on the P1022DS because the local bus (eLBC)
46  * and the DIU video signals share the same pins, which means that enabling the
47  * DIU will disable access to NOR flash.
48  */
49 
50 /* DIU Pixel Clock bits of the CLKDVDR Global Utilities register */
51 #define CLKDVDR_PXCKEN		0x80000000
52 #define CLKDVDR_PXCKINV		0x10000000
53 #define CLKDVDR_PXCKDLY		0x06000000
54 #define CLKDVDR_PXCLK_MASK	0x00FF0000
55 
56 /* Some ngPIXIS register definitions */
57 #define PX_CTL		3
58 #define PX_BRDCFG0	8
59 #define PX_BRDCFG1	9
60 
61 #define PX_BRDCFG0_ELBC_SPI_MASK	0xc0
62 #define PX_BRDCFG0_ELBC_SPI_ELBC	0x00
63 #define PX_BRDCFG0_ELBC_SPI_NULL	0xc0
64 #define PX_BRDCFG0_ELBC_DIU		0x02
65 
66 #define PX_BRDCFG1_DVIEN	0x80
67 #define PX_BRDCFG1_DFPEN	0x40
68 #define PX_BRDCFG1_BACKLIGHT	0x20
69 #define PX_BRDCFG1_DDCEN	0x10
70 
71 #define PX_CTL_ALTACC		0x80
72 
73 /*
74  * DIU Area Descriptor
75  *
76  * Note that we need to byte-swap the value before it's written to the AD
77  * register.  So even though the registers don't look like they're in the same
78  * bit positions as they are on the MPC8610, the same value is written to the
79  * AD register on the MPC8610 and on the P1022.
80  */
81 #define AD_BYTE_F		0x10000000
82 #define AD_ALPHA_C_MASK		0x0E000000
83 #define AD_ALPHA_C_SHIFT	25
84 #define AD_BLUE_C_MASK		0x01800000
85 #define AD_BLUE_C_SHIFT		23
86 #define AD_GREEN_C_MASK		0x00600000
87 #define AD_GREEN_C_SHIFT	21
88 #define AD_RED_C_MASK		0x00180000
89 #define AD_RED_C_SHIFT		19
90 #define AD_PALETTE		0x00040000
91 #define AD_PIXEL_S_MASK		0x00030000
92 #define AD_PIXEL_S_SHIFT	16
93 #define AD_COMP_3_MASK		0x0000F000
94 #define AD_COMP_3_SHIFT		12
95 #define AD_COMP_2_MASK		0x00000F00
96 #define AD_COMP_2_SHIFT		8
97 #define AD_COMP_1_MASK		0x000000F0
98 #define AD_COMP_1_SHIFT		4
99 #define AD_COMP_0_MASK		0x0000000F
100 #define AD_COMP_0_SHIFT		0
101 
102 #define MAKE_AD(alpha, red, blue, green, size, c0, c1, c2, c3) \
103 	cpu_to_le32(AD_BYTE_F | (alpha << AD_ALPHA_C_SHIFT) | \
104 	(blue << AD_BLUE_C_SHIFT) | (green << AD_GREEN_C_SHIFT) | \
105 	(red << AD_RED_C_SHIFT) | (c3 << AD_COMP_3_SHIFT) | \
106 	(c2 << AD_COMP_2_SHIFT) | (c1 << AD_COMP_1_SHIFT) | \
107 	(c0 << AD_COMP_0_SHIFT) | (size << AD_PIXEL_S_SHIFT))
108 
109 struct fsl_law {
110 	u32	lawbar;
111 	u32	reserved1;
112 	u32	lawar;
113 	u32	reserved[5];
114 };
115 
116 #define LAWBAR_MASK	0x00F00000
117 #define LAWBAR_SHIFT	12
118 
119 #define LAWAR_EN	0x80000000
120 #define LAWAR_TGT_MASK	0x01F00000
121 #define LAW_TRGT_IF_LBC	(0x04 << 20)
122 
123 #define LAWAR_MASK	(LAWAR_EN | LAWAR_TGT_MASK)
124 #define LAWAR_MATCH	(LAWAR_EN | LAW_TRGT_IF_LBC)
125 
126 #define BR_BA		0xFFFF8000
127 
128 /*
129  * Map a BRx value to a physical address
130  *
131  * The localbus BRx registers only store the lower 32 bits of the address.  To
132  * obtain the upper four bits, we need to scan the LAW table.  The entry which
133  * maps to the localbus will contain the upper four bits.
134  */
135 static phys_addr_t lbc_br_to_phys(const void *ecm, unsigned int count, u32 br)
136 {
137 #ifndef CONFIG_PHYS_64BIT
138 	/*
139 	 * If we only have 32-bit addressing, then the BRx address *is* the
140 	 * physical address.
141 	 */
142 	return br & BR_BA;
143 #else
144 	const struct fsl_law *law = ecm + 0xc08;
145 	unsigned int i;
146 
147 	for (i = 0; i < count; i++) {
148 		u64 lawbar = in_be32(&law[i].lawbar);
149 		u32 lawar = in_be32(&law[i].lawar);
150 
151 		if ((lawar & LAWAR_MASK) == LAWAR_MATCH)
152 			/* Extract the upper four bits */
153 			return (br & BR_BA) | ((lawbar & LAWBAR_MASK) << 12);
154 	}
155 
156 	return 0;
157 #endif
158 }
159 
160 /**
161  * p1022ds_set_monitor_port: switch the output to a different monitor port
162  */
163 static void p1022ds_set_monitor_port(enum fsl_diu_monitor_port port)
164 {
165 	struct device_node *guts_node;
166 	struct device_node *lbc_node = NULL;
167 	struct device_node *law_node = NULL;
168 	struct ccsr_guts __iomem *guts;
169 	struct fsl_lbc_regs *lbc = NULL;
170 	void *ecm = NULL;
171 	u8 __iomem *lbc_lcs0_ba = NULL;
172 	u8 __iomem *lbc_lcs1_ba = NULL;
173 	phys_addr_t cs0_addr, cs1_addr;
174 	u32 br0, or0, br1, or1;
175 	const __be32 *iprop;
176 	unsigned int num_laws;
177 	u8 b;
178 
179 	/* Map the global utilities registers. */
180 	guts_node = of_find_compatible_node(NULL, NULL, "fsl,p1022-guts");
181 	if (!guts_node) {
182 		pr_err("p1022ds: missing global utilities device node\n");
183 		return;
184 	}
185 
186 	guts = of_iomap(guts_node, 0);
187 	if (!guts) {
188 		pr_err("p1022ds: could not map global utilities device\n");
189 		goto exit;
190 	}
191 
192 	lbc_node = of_find_compatible_node(NULL, NULL, "fsl,p1022-elbc");
193 	if (!lbc_node) {
194 		pr_err("p1022ds: missing localbus node\n");
195 		goto exit;
196 	}
197 
198 	lbc = of_iomap(lbc_node, 0);
199 	if (!lbc) {
200 		pr_err("p1022ds: could not map localbus node\n");
201 		goto exit;
202 	}
203 
204 	law_node = of_find_compatible_node(NULL, NULL, "fsl,ecm-law");
205 	if (!law_node) {
206 		pr_err("p1022ds: missing local access window node\n");
207 		goto exit;
208 	}
209 
210 	ecm = of_iomap(law_node, 0);
211 	if (!ecm) {
212 		pr_err("p1022ds: could not map local access window node\n");
213 		goto exit;
214 	}
215 
216 	iprop = of_get_property(law_node, "fsl,num-laws", NULL);
217 	if (!iprop) {
218 		pr_err("p1022ds: LAW node is missing fsl,num-laws property\n");
219 		goto exit;
220 	}
221 	num_laws = be32_to_cpup(iprop);
222 
223 	/*
224 	 * Indirect mode requires both BR0 and BR1 to be set to "GPCM",
225 	 * otherwise writes to these addresses won't actually appear on the
226 	 * local bus, and so the PIXIS won't see them.
227 	 *
228 	 * In FCM mode, writes go to the NAND controller, which does not pass
229 	 * them to the localbus directly.  So we force BR0 and BR1 into GPCM
230 	 * mode, since we don't care about what's behind the localbus any
231 	 * more.
232 	 */
233 	br0 = in_be32(&lbc->bank[0].br);
234 	br1 = in_be32(&lbc->bank[1].br);
235 	or0 = in_be32(&lbc->bank[0].or);
236 	or1 = in_be32(&lbc->bank[1].or);
237 
238 	/* Make sure CS0 and CS1 are programmed */
239 	if (!(br0 & BR_V) || !(br1 & BR_V)) {
240 		pr_err("p1022ds: CS0 and/or CS1 is not programmed\n");
241 		goto exit;
242 	}
243 
244 	/*
245 	 * Use the existing BRx/ORx values if it's already GPCM. Otherwise,
246 	 * force the values to simple 32KB GPCM windows with the most
247 	 * conservative timing.
248 	 */
249 	if ((br0 & BR_MSEL) != BR_MS_GPCM) {
250 		br0 = (br0 & BR_BA) | BR_V;
251 		or0 = 0xFFFF8000 | 0xFF7;
252 		out_be32(&lbc->bank[0].br, br0);
253 		out_be32(&lbc->bank[0].or, or0);
254 	}
255 	if ((br1 & BR_MSEL) != BR_MS_GPCM) {
256 		br1 = (br1 & BR_BA) | BR_V;
257 		or1 = 0xFFFF8000 | 0xFF7;
258 		out_be32(&lbc->bank[1].br, br1);
259 		out_be32(&lbc->bank[1].or, or1);
260 	}
261 
262 	cs0_addr = lbc_br_to_phys(ecm, num_laws, br0);
263 	if (!cs0_addr) {
264 		pr_err("p1022ds: could not determine physical address for CS0"
265 		       " (BR0=%08x)\n", br0);
266 		goto exit;
267 	}
268 	cs1_addr = lbc_br_to_phys(ecm, num_laws, br1);
269 	if (!cs1_addr) {
270 		pr_err("p1022ds: could not determine physical address for CS1"
271 		       " (BR1=%08x)\n", br1);
272 		goto exit;
273 	}
274 
275 	lbc_lcs0_ba = ioremap(cs0_addr, 1);
276 	if (!lbc_lcs0_ba) {
277 		pr_err("p1022ds: could not ioremap CS0 address %llx\n",
278 		       (unsigned long long)cs0_addr);
279 		goto exit;
280 	}
281 	lbc_lcs1_ba = ioremap(cs1_addr, 1);
282 	if (!lbc_lcs1_ba) {
283 		pr_err("p1022ds: could not ioremap CS1 address %llx\n",
284 		       (unsigned long long)cs1_addr);
285 		goto exit;
286 	}
287 
288 	/* Make sure we're in indirect mode first. */
289 	if ((in_be32(&guts->pmuxcr) & PMUXCR_ELBCDIU_MASK) !=
290 	    PMUXCR_ELBCDIU_DIU) {
291 		struct device_node *pixis_node;
292 		void __iomem *pixis;
293 
294 		pixis_node =
295 			of_find_compatible_node(NULL, NULL, "fsl,p1022ds-fpga");
296 		if (!pixis_node) {
297 			pr_err("p1022ds: missing pixis node\n");
298 			goto exit;
299 		}
300 
301 		pixis = of_iomap(pixis_node, 0);
302 		of_node_put(pixis_node);
303 		if (!pixis) {
304 			pr_err("p1022ds: could not map pixis registers\n");
305 			goto exit;
306 		}
307 
308 		/* Enable indirect PIXIS mode.  */
309 		setbits8(pixis + PX_CTL, PX_CTL_ALTACC);
310 		iounmap(pixis);
311 
312 		/* Switch the board mux to the DIU */
313 		out_8(lbc_lcs0_ba, PX_BRDCFG0);	/* BRDCFG0 */
314 		b = in_8(lbc_lcs1_ba);
315 		b |= PX_BRDCFG0_ELBC_DIU;
316 		out_8(lbc_lcs1_ba, b);
317 
318 		/* Set the chip mux to DIU mode. */
319 		clrsetbits_be32(&guts->pmuxcr, PMUXCR_ELBCDIU_MASK,
320 				PMUXCR_ELBCDIU_DIU);
321 		in_be32(&guts->pmuxcr);
322 	}
323 
324 
325 	switch (port) {
326 	case FSL_DIU_PORT_DVI:
327 		/* Enable the DVI port, disable the DFP and the backlight */
328 		out_8(lbc_lcs0_ba, PX_BRDCFG1);
329 		b = in_8(lbc_lcs1_ba);
330 		b &= ~(PX_BRDCFG1_DFPEN | PX_BRDCFG1_BACKLIGHT);
331 		b |= PX_BRDCFG1_DVIEN;
332 		out_8(lbc_lcs1_ba, b);
333 		break;
334 	case FSL_DIU_PORT_LVDS:
335 		/*
336 		 * LVDS also needs backlight enabled, otherwise the display
337 		 * will be blank.
338 		 */
339 		/* Enable the DFP port, disable the DVI and the backlight */
340 		out_8(lbc_lcs0_ba, PX_BRDCFG1);
341 		b = in_8(lbc_lcs1_ba);
342 		b &= ~PX_BRDCFG1_DVIEN;
343 		b |= PX_BRDCFG1_DFPEN | PX_BRDCFG1_BACKLIGHT;
344 		out_8(lbc_lcs1_ba, b);
345 		break;
346 	default:
347 		pr_err("p1022ds: unsupported monitor port %i\n", port);
348 	}
349 
350 exit:
351 	if (lbc_lcs1_ba)
352 		iounmap(lbc_lcs1_ba);
353 	if (lbc_lcs0_ba)
354 		iounmap(lbc_lcs0_ba);
355 	if (lbc)
356 		iounmap(lbc);
357 	if (ecm)
358 		iounmap(ecm);
359 	if (guts)
360 		iounmap(guts);
361 
362 	of_node_put(law_node);
363 	of_node_put(lbc_node);
364 	of_node_put(guts_node);
365 }
366 
367 /**
368  * p1022ds_set_pixel_clock: program the DIU's clock
369  *
370  * @pixclock: the wavelength, in picoseconds, of the clock
371  */
372 void p1022ds_set_pixel_clock(unsigned int pixclock)
373 {
374 	struct device_node *guts_np = NULL;
375 	struct ccsr_guts __iomem *guts;
376 	unsigned long freq;
377 	u64 temp;
378 	u32 pxclk;
379 
380 	/* Map the global utilities registers. */
381 	guts_np = of_find_compatible_node(NULL, NULL, "fsl,p1022-guts");
382 	if (!guts_np) {
383 		pr_err("p1022ds: missing global utilities device node\n");
384 		return;
385 	}
386 
387 	guts = of_iomap(guts_np, 0);
388 	of_node_put(guts_np);
389 	if (!guts) {
390 		pr_err("p1022ds: could not map global utilities device\n");
391 		return;
392 	}
393 
394 	/* Convert pixclock from a wavelength to a frequency */
395 	temp = 1000000000000ULL;
396 	do_div(temp, pixclock);
397 	freq = temp;
398 
399 	/*
400 	 * 'pxclk' is the ratio of the platform clock to the pixel clock.
401 	 * This number is programmed into the CLKDVDR register, and the valid
402 	 * range of values is 2-255.
403 	 */
404 	pxclk = DIV_ROUND_CLOSEST(fsl_get_sys_freq(), freq);
405 	pxclk = clamp_t(u32, pxclk, 2, 255);
406 
407 	/* Disable the pixel clock, and set it to non-inverted and no delay */
408 	clrbits32(&guts->clkdvdr,
409 		  CLKDVDR_PXCKEN | CLKDVDR_PXCKDLY | CLKDVDR_PXCLK_MASK);
410 
411 	/* Enable the clock and set the pxclk */
412 	setbits32(&guts->clkdvdr, CLKDVDR_PXCKEN | (pxclk << 16));
413 
414 	iounmap(guts);
415 }
416 
417 /**
418  * p1022ds_valid_monitor_port: set the monitor port for sysfs
419  */
420 enum fsl_diu_monitor_port
421 p1022ds_valid_monitor_port(enum fsl_diu_monitor_port port)
422 {
423 	switch (port) {
424 	case FSL_DIU_PORT_DVI:
425 	case FSL_DIU_PORT_LVDS:
426 		return port;
427 	default:
428 		return FSL_DIU_PORT_DVI; /* Dual-link LVDS is not supported */
429 	}
430 }
431 
432 #endif
433 
434 void __init p1022_ds_pic_init(void)
435 {
436 	struct mpic *mpic = mpic_alloc(NULL, 0, MPIC_BIG_ENDIAN |
437 		MPIC_SINGLE_DEST_CPU,
438 		0, 256, " OpenPIC  ");
439 	BUG_ON(mpic == NULL);
440 	mpic_init(mpic);
441 }
442 
443 #if defined(CONFIG_FB_FSL_DIU) || defined(CONFIG_FB_FSL_DIU_MODULE)
444 
445 /* TRUE if there is a "video=fslfb" command-line parameter. */
446 static bool fslfb;
447 
448 /*
449  * Search for a "video=fslfb" command-line parameter, and set 'fslfb' to
450  * true if we find it.
451  *
452  * We need to use early_param() instead of __setup() because the normal
453  * __setup() gets called to late.  However, early_param() gets called very
454  * early, before the device tree is unflattened, so all we can do now is set a
455  * global variable.  Later on, p1022_ds_setup_arch() will use that variable
456  * to determine if we need to update the device tree.
457  */
458 static int __init early_video_setup(char *options)
459 {
460 	fslfb = (strncmp(options, "fslfb:", 6) == 0);
461 
462 	return 0;
463 }
464 early_param("video", early_video_setup);
465 
466 #endif
467 
468 /*
469  * Setup the architecture
470  */
471 static void __init p1022_ds_setup_arch(void)
472 {
473 	if (ppc_md.progress)
474 		ppc_md.progress("p1022_ds_setup_arch()", 0);
475 
476 #if defined(CONFIG_FB_FSL_DIU) || defined(CONFIG_FB_FSL_DIU_MODULE)
477 	diu_ops.set_monitor_port	= p1022ds_set_monitor_port;
478 	diu_ops.set_pixel_clock		= p1022ds_set_pixel_clock;
479 	diu_ops.valid_monitor_port	= p1022ds_valid_monitor_port;
480 
481 	/*
482 	 * Disable the NOR and NAND flash nodes if there is video=fslfb...
483 	 * command-line parameter.  When the DIU is active, the localbus is
484 	 * unavailable, so we have to disable these nodes before the MTD
485 	 * driver loads.
486 	 */
487 	if (fslfb) {
488 		struct device_node *np =
489 			of_find_compatible_node(NULL, NULL, "fsl,p1022-elbc");
490 
491 		if (np) {
492 			struct device_node *np2;
493 
494 			of_node_get(np);
495 			np2 = of_find_compatible_node(np, NULL, "cfi-flash");
496 			if (np2) {
497 				static struct property nor_status = {
498 					.name = "status",
499 					.value = "disabled",
500 					.length = sizeof("disabled"),
501 				};
502 
503 				/*
504 				 * of_update_property() is called before
505 				 * kmalloc() is available, so the 'new' object
506 				 * should be allocated in the global area.
507 				 * The easiest way is to do that is to
508 				 * allocate one static local variable for each
509 				 * call to this function.
510 				 */
511 				pr_info("p1022ds: disabling %pOF node",
512 					np2);
513 				of_update_property(np2, &nor_status);
514 				of_node_put(np2);
515 			}
516 
517 			of_node_get(np);
518 			np2 = of_find_compatible_node(np, NULL,
519 						      "fsl,elbc-fcm-nand");
520 			if (np2) {
521 				static struct property nand_status = {
522 					.name = "status",
523 					.value = "disabled",
524 					.length = sizeof("disabled"),
525 				};
526 
527 				pr_info("p1022ds: disabling %pOF node",
528 					np2);
529 				of_update_property(np2, &nand_status);
530 				of_node_put(np2);
531 			}
532 
533 			of_node_put(np);
534 		}
535 
536 	}
537 
538 #endif
539 
540 	mpc85xx_smp_init();
541 
542 	fsl_pci_assign_primary();
543 
544 	swiotlb_detect_4g();
545 
546 	pr_info("Freescale P1022 DS reference board\n");
547 }
548 
549 machine_arch_initcall(p1022_ds, mpc85xx_common_publish_devices);
550 
551 /*
552  * Called very early, device-tree isn't unflattened
553  */
554 static int __init p1022_ds_probe(void)
555 {
556 	return of_machine_is_compatible("fsl,p1022ds");
557 }
558 
559 define_machine(p1022_ds) {
560 	.name			= "P1022 DS",
561 	.probe			= p1022_ds_probe,
562 	.setup_arch		= p1022_ds_setup_arch,
563 	.init_IRQ		= p1022_ds_pic_init,
564 #ifdef CONFIG_PCI
565 	.pcibios_fixup_bus	= fsl_pcibios_fixup_bus,
566 	.pcibios_fixup_phb	= fsl_pcibios_fixup_phb,
567 #endif
568 	.get_irq		= mpic_get_irq,
569 	.calibrate_decr		= generic_calibrate_decr,
570 	.progress		= udbg_progress,
571 };
572