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 */
lbc_br_to_phys(const void * ecm,unsigned int count,u32 br)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 */
p1022ds_set_monitor_port(enum fsl_diu_monitor_port port)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 */
p1022ds_set_pixel_clock(unsigned int pixclock)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
p1022ds_valid_monitor_port(enum fsl_diu_monitor_port 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
p1022_ds_pic_init(void)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 */
early_video_setup(char * options)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 */
p1022_ds_setup_arch(void)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 */
p1022_ds_probe(void)554 static int __init p1022_ds_probe(void)
555 {
556 return of_machine_is_compatible("fsl,p1022ds");
557 }
558
define_machine(p1022_ds)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