2 * Copyright (C) 2007,2008 Freescale Semiconductor, Inc. All rights reserved.
4 * Author: John Rigby <jrigby@freescale.com>
9 * This is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
15 #include <linux/kernel.h>
17 #include <linux/irq.h>
18 #include <linux/of_platform.h>
19 #include <linux/fsl-diu-fb.h>
20 #include <linux/bootmem.h>
21 #include <sysdev/fsl_soc.h>
23 #include <asm/cacheflush.h>
24 #include <asm/machdep.h>
28 #include <asm/mpc5121.h>
29 #include <asm/mpc52xx_psc.h>
33 static struct mpc512x_reset_module __iomem *reset_module_base;
35 static void __init mpc512x_restart_init(void)
37 struct device_node *np;
39 np = of_find_compatible_node(NULL, NULL, "fsl,mpc5121-reset");
43 reset_module_base = of_iomap(np, 0);
47 void mpc512x_restart(char *cmd)
49 if (reset_module_base) {
50 /* Enable software reset "RSTE" */
51 out_be32(&reset_module_base->rpr, 0x52535445);
52 /* Set software hard reset */
53 out_be32(&reset_module_base->rcr, 0x2);
55 pr_err("Restart module not mapped.\n");
61 struct fsl_diu_shared_fb {
62 u8 gamma[0x300]; /* 32-bit aligned! */
63 struct diu_ad ad0; /* 32-bit aligned! */
69 u32 mpc512x_get_pixel_format(enum fsl_diu_monitor_port port,
70 unsigned int bits_per_pixel)
72 switch (bits_per_pixel) {
83 void mpc512x_set_gamma_table(enum fsl_diu_monitor_port port,
84 char *gamma_table_base)
88 void mpc512x_set_monitor_port(enum fsl_diu_monitor_port port)
92 #define DIU_DIV_MASK 0x000000ff
93 void mpc512x_set_pixel_clock(unsigned int pixclock)
95 unsigned long bestval, bestfreq, speed, busfreq;
96 unsigned long minpixclock, maxpixclock, pixval;
97 struct mpc512x_ccm __iomem *ccm;
98 struct device_node *np;
103 np = of_find_compatible_node(NULL, NULL, "fsl,mpc5121-clock");
105 pr_err("Can't find clock control module.\n");
109 ccm = of_iomap(np, 0);
112 pr_err("Can't map clock control module reg.\n");
116 np = of_find_node_by_type(NULL, "cpu");
118 const unsigned int *prop =
119 of_get_property(np, "bus-frequency", NULL);
125 pr_err("Can't get bus-frequency property\n");
129 pr_err("Can't find 'cpu' node.\n");
133 /* Pixel Clock configuration */
134 pr_debug("DIU: Bus Frequency = %lu\n", busfreq);
135 speed = busfreq * 4; /* DIU_DIV ratio is 4 * CSB_CLK / DIU_CLK */
137 /* Calculate the pixel clock with the smallest error */
138 /* calculate the following in steps to avoid overflow */
139 pr_debug("DIU pixclock in ps - %d\n", pixclock);
140 temp = (1000000000 / pixclock) * 1000;
142 pr_debug("DIU pixclock freq - %u\n", pixclock);
144 temp = temp / 20; /* pixclock * 0.05 */
145 pr_debug("deviation = %d\n", temp);
146 minpixclock = pixclock - temp;
147 maxpixclock = pixclock + temp;
148 pr_debug("DIU minpixclock - %lu\n", minpixclock);
149 pr_debug("DIU maxpixclock - %lu\n", maxpixclock);
150 pixval = speed/pixclock;
151 pr_debug("DIU pixval = %lu\n", pixval);
155 pr_debug("DIU bestval = %lu\n", bestval);
158 for (i = -1; i <= 1; i++) {
159 temp = speed / (pixval+i);
160 pr_debug("DIU test pixval i=%d, pixval=%lu, temp freq. = %u\n",
162 if ((temp < minpixclock) || (temp > maxpixclock))
163 pr_debug("DIU exceeds monitor range (%lu to %lu)\n",
164 minpixclock, maxpixclock);
165 else if (abs(temp - pixclock) < err) {
166 pr_debug("Entered the else if block %d\n", i);
167 err = abs(temp - pixclock);
168 bestval = pixval + i;
173 pr_debug("DIU chose = %lx\n", bestval);
174 pr_debug("DIU error = %ld\n NomPixClk ", err);
175 pr_debug("DIU: Best Freq = %lx\n", bestfreq);
176 /* Modify DIU_DIV in CCM SCFR1 */
177 temp = in_be32(&ccm->scfr1);
178 pr_debug("DIU: Current value of SCFR1: 0x%08x\n", temp);
179 temp &= ~DIU_DIV_MASK;
180 temp |= (bestval & DIU_DIV_MASK);
181 out_be32(&ccm->scfr1, temp);
182 pr_debug("DIU: Modified value of SCFR1: 0x%08x\n", temp);
186 enum fsl_diu_monitor_port
187 mpc512x_valid_monitor_port(enum fsl_diu_monitor_port port)
189 return FSL_DIU_PORT_DVI;
192 static struct fsl_diu_shared_fb __attribute__ ((__aligned__(8))) diu_shared_fb;
194 static inline void mpc512x_free_bootmem(struct page *page)
196 __ClearPageReserved(page);
197 BUG_ON(PageTail(page));
198 BUG_ON(atomic_read(&page->_count) > 1);
199 atomic_set(&page->_count, 1);
204 void mpc512x_release_bootmem(void)
206 unsigned long addr = diu_shared_fb.fb_phys & PAGE_MASK;
207 unsigned long size = diu_shared_fb.fb_len;
208 unsigned long start, end;
210 if (diu_shared_fb.in_use) {
211 start = PFN_UP(addr);
212 end = PFN_DOWN(addr + size);
214 for (; start < end; start++)
215 mpc512x_free_bootmem(pfn_to_page(start));
217 diu_shared_fb.in_use = false;
219 diu_ops.release_bootmem = NULL;
223 * Check if DIU was pre-initialized. If so, perform steps
224 * needed to continue displaying through the whole boot process.
225 * Move area descriptor and gamma table elsewhere, they are
226 * destroyed by bootmem allocator otherwise. The frame buffer
227 * address range will be reserved in setup_arch() after bootmem
230 void __init mpc512x_init_diu(void)
232 struct device_node *np;
233 struct diu __iomem *diu_reg;
236 unsigned long mode, pix_fmt, res, bpp;
239 np = of_find_compatible_node(NULL, NULL, "fsl,mpc5121-diu");
241 pr_err("No DIU node\n");
245 diu_reg = of_iomap(np, 0);
248 pr_err("Can't map DIU\n");
252 mode = in_be32(&diu_reg->diu_mode);
253 if (mode == MFB_MODE0) {
254 pr_info("%s: DIU OFF\n", __func__);
258 desc = in_be32(&diu_reg->desc[0]);
259 vaddr = ioremap(desc, sizeof(struct diu_ad));
261 pr_err("Can't map DIU area desc.\n");
264 memcpy(&diu_shared_fb.ad0, vaddr, sizeof(struct diu_ad));
265 /* flush fb area descriptor */
266 dst = (unsigned long)&diu_shared_fb.ad0;
267 flush_dcache_range(dst, dst + sizeof(struct diu_ad) - 1);
269 res = in_be32(&diu_reg->disp_size);
270 pix_fmt = in_le32(vaddr);
271 bpp = ((pix_fmt >> 16) & 0x3) + 1;
272 diu_shared_fb.fb_phys = in_le32(vaddr + 4);
273 diu_shared_fb.fb_len = ((res & 0xfff0000) >> 16) * (res & 0xfff) * bpp;
274 diu_shared_fb.in_use = true;
277 desc = in_be32(&diu_reg->gamma);
278 vaddr = ioremap(desc, sizeof(diu_shared_fb.gamma));
280 pr_err("Can't map DIU area desc.\n");
281 diu_shared_fb.in_use = false;
284 memcpy(&diu_shared_fb.gamma, vaddr, sizeof(diu_shared_fb.gamma));
285 /* flush gamma table */
286 dst = (unsigned long)&diu_shared_fb.gamma;
287 flush_dcache_range(dst, dst + sizeof(diu_shared_fb.gamma) - 1);
290 out_be32(&diu_reg->gamma, virt_to_phys(&diu_shared_fb.gamma));
291 out_be32(&diu_reg->desc[1], 0);
292 out_be32(&diu_reg->desc[2], 0);
293 out_be32(&diu_reg->desc[0], virt_to_phys(&diu_shared_fb.ad0));
299 void __init mpc512x_setup_diu(void)
304 * We do not allocate and configure new area for bitmap buffer
305 * because it would requere copying bitmap data (splash image)
306 * and so negatively affect boot time. Instead we reserve the
307 * already configured frame buffer area so that it won't be
308 * destroyed. The starting address of the area to reserve and
309 * also it's length is passed to reserve_bootmem(). It will be
310 * freed later on first open of fbdev, when splash image is not
313 if (diu_shared_fb.in_use) {
314 ret = reserve_bootmem(diu_shared_fb.fb_phys,
315 diu_shared_fb.fb_len,
318 pr_err("%s: reserve bootmem failed\n", __func__);
319 diu_shared_fb.in_use = false;
323 diu_ops.get_pixel_format = mpc512x_get_pixel_format;
324 diu_ops.set_gamma_table = mpc512x_set_gamma_table;
325 diu_ops.set_monitor_port = mpc512x_set_monitor_port;
326 diu_ops.set_pixel_clock = mpc512x_set_pixel_clock;
327 diu_ops.valid_monitor_port = mpc512x_valid_monitor_port;
328 diu_ops.release_bootmem = mpc512x_release_bootmem;
331 void __init mpc512x_init_IRQ(void)
333 struct device_node *np;
335 np = of_find_compatible_node(NULL, NULL, "fsl,mpc5121-ipic");
343 * Initialize the default interrupt mapping priorities,
344 * in case the boot rom changed something on us.
346 ipic_set_default_priority();
350 * Nodes to do bus probe on, soc and localbus
352 static struct of_device_id __initdata of_bus_ids[] = {
353 { .compatible = "fsl,mpc5121-immr", },
354 { .compatible = "fsl,mpc5121-localbus", },
358 void __init mpc512x_declare_of_platform_devices(void)
360 struct device_node *np;
362 if (of_platform_bus_probe(NULL, of_bus_ids, NULL))
363 printk(KERN_ERR __FILE__ ": "
364 "Error while probing of_platform bus\n");
366 np = of_find_compatible_node(NULL, NULL, "fsl,mpc5121-nfc");
368 of_platform_device_create(np, NULL, NULL);
373 #define DEFAULT_FIFO_SIZE 16
375 static unsigned int __init get_fifo_size(struct device_node *np,
378 const unsigned int *fp;
380 fp = of_get_property(np, prop_name, NULL);
384 pr_warning("no %s property in %s node, defaulting to %d\n",
385 prop_name, np->full_name, DEFAULT_FIFO_SIZE);
387 return DEFAULT_FIFO_SIZE;
390 #define FIFOC(_base) ((struct mpc512x_psc_fifo __iomem *) \
391 ((u32)(_base) + sizeof(struct mpc52xx_psc)))
393 /* Init PSC FIFO space for TX and RX slices */
394 void __init mpc512x_psc_fifo_init(void)
396 struct device_node *np;
398 unsigned int tx_fifo_size;
399 unsigned int rx_fifo_size;
400 int fifobase = 0; /* current fifo address in 32 bit words */
402 for_each_compatible_node(np, NULL, "fsl,mpc5121-psc") {
403 tx_fifo_size = get_fifo_size(np, "fsl,tx-fifo-size");
404 rx_fifo_size = get_fifo_size(np, "fsl,rx-fifo-size");
406 /* size in register is in 4 byte units */
414 psc = of_iomap(np, 0);
416 pr_err("%s: Can't map %s device\n",
417 __func__, np->full_name);
421 /* FIFO space is 4KiB, check if requested size is available */
422 if ((fifobase + tx_fifo_size + rx_fifo_size) > 0x1000) {
423 pr_err("%s: no fifo space available for %s\n",
424 __func__, np->full_name);
427 * chances are that another device requests less
428 * fifo space, so we continue.
433 /* set tx and rx fifo size registers */
434 out_be32(&FIFOC(psc)->txsz, (fifobase << 16) | tx_fifo_size);
435 fifobase += tx_fifo_size;
436 out_be32(&FIFOC(psc)->rxsz, (fifobase << 16) | rx_fifo_size);
437 fifobase += rx_fifo_size;
439 /* reset and enable the slices */
440 out_be32(&FIFOC(psc)->txcmd, 0x80);
441 out_be32(&FIFOC(psc)->txcmd, 0x01);
442 out_be32(&FIFOC(psc)->rxcmd, 0x80);
443 out_be32(&FIFOC(psc)->rxcmd, 0x01);
449 void __init mpc512x_init(void)
451 mpc512x_declare_of_platform_devices();
453 mpc512x_restart_init();
454 mpc512x_psc_fifo_init();