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;
38 const char *reset_compat;
40 reset_compat = mpc512x_select_reset_compat();
41 np = of_find_compatible_node(NULL, NULL, reset_compat);
45 reset_module_base = of_iomap(np, 0);
49 void mpc512x_restart(char *cmd)
51 if (reset_module_base) {
52 /* Enable software reset "RSTE" */
53 out_be32(&reset_module_base->rpr, 0x52535445);
54 /* Set software hard reset */
55 out_be32(&reset_module_base->rcr, 0x2);
57 pr_err("Restart module not mapped.\n");
63 struct fsl_diu_shared_fb {
64 u8 gamma[0x300]; /* 32-bit aligned! */
65 struct diu_ad ad0; /* 32-bit aligned! */
71 #define DIU_DIV_MASK 0x000000ff
72 static void mpc512x_set_pixel_clock(unsigned int pixclock)
74 unsigned long bestval, bestfreq, speed, busfreq;
75 unsigned long minpixclock, maxpixclock, pixval;
76 struct mpc512x_ccm __iomem *ccm;
77 struct device_node *np;
82 np = of_find_compatible_node(NULL, NULL, "fsl,mpc5121-clock");
84 pr_err("Can't find clock control module.\n");
88 ccm = of_iomap(np, 0);
91 pr_err("Can't map clock control module reg.\n");
95 np = of_find_node_by_type(NULL, "cpu");
97 const unsigned int *prop =
98 of_get_property(np, "bus-frequency", NULL);
104 pr_err("Can't get bus-frequency property\n");
108 pr_err("Can't find 'cpu' node.\n");
112 /* Pixel Clock configuration */
113 pr_debug("DIU: Bus Frequency = %lu\n", busfreq);
114 speed = busfreq * 4; /* DIU_DIV ratio is 4 * CSB_CLK / DIU_CLK */
116 /* Calculate the pixel clock with the smallest error */
117 /* calculate the following in steps to avoid overflow */
118 pr_debug("DIU pixclock in ps - %d\n", pixclock);
119 temp = (1000000000 / pixclock) * 1000;
121 pr_debug("DIU pixclock freq - %u\n", pixclock);
123 temp = temp / 20; /* pixclock * 0.05 */
124 pr_debug("deviation = %d\n", temp);
125 minpixclock = pixclock - temp;
126 maxpixclock = pixclock + temp;
127 pr_debug("DIU minpixclock - %lu\n", minpixclock);
128 pr_debug("DIU maxpixclock - %lu\n", maxpixclock);
129 pixval = speed/pixclock;
130 pr_debug("DIU pixval = %lu\n", pixval);
134 pr_debug("DIU bestval = %lu\n", bestval);
137 for (i = -1; i <= 1; i++) {
138 temp = speed / (pixval+i);
139 pr_debug("DIU test pixval i=%d, pixval=%lu, temp freq. = %u\n",
141 if ((temp < minpixclock) || (temp > maxpixclock))
142 pr_debug("DIU exceeds monitor range (%lu to %lu)\n",
143 minpixclock, maxpixclock);
144 else if (abs(temp - pixclock) < err) {
145 pr_debug("Entered the else if block %d\n", i);
146 err = abs(temp - pixclock);
147 bestval = pixval + i;
152 pr_debug("DIU chose = %lx\n", bestval);
153 pr_debug("DIU error = %ld\n NomPixClk ", err);
154 pr_debug("DIU: Best Freq = %lx\n", bestfreq);
155 /* Modify DIU_DIV in CCM SCFR1 */
156 temp = in_be32(&ccm->scfr1);
157 pr_debug("DIU: Current value of SCFR1: 0x%08x\n", temp);
158 temp &= ~DIU_DIV_MASK;
159 temp |= (bestval & DIU_DIV_MASK);
160 out_be32(&ccm->scfr1, temp);
161 pr_debug("DIU: Modified value of SCFR1: 0x%08x\n", temp);
165 static enum fsl_diu_monitor_port
166 mpc512x_valid_monitor_port(enum fsl_diu_monitor_port port)
168 return FSL_DIU_PORT_DVI;
171 static struct fsl_diu_shared_fb __attribute__ ((__aligned__(8))) diu_shared_fb;
173 static inline void mpc512x_free_bootmem(struct page *page)
175 BUG_ON(PageTail(page));
176 BUG_ON(atomic_read(&page->_count) > 1);
177 free_reserved_page(page);
180 static void mpc512x_release_bootmem(void)
182 unsigned long addr = diu_shared_fb.fb_phys & PAGE_MASK;
183 unsigned long size = diu_shared_fb.fb_len;
184 unsigned long start, end;
186 if (diu_shared_fb.in_use) {
187 start = PFN_UP(addr);
188 end = PFN_DOWN(addr + size);
190 for (; start < end; start++)
191 mpc512x_free_bootmem(pfn_to_page(start));
193 diu_shared_fb.in_use = false;
195 diu_ops.release_bootmem = NULL;
199 * Check if DIU was pre-initialized. If so, perform steps
200 * needed to continue displaying through the whole boot process.
201 * Move area descriptor and gamma table elsewhere, they are
202 * destroyed by bootmem allocator otherwise. The frame buffer
203 * address range will be reserved in setup_arch() after bootmem
206 static void __init mpc512x_init_diu(void)
208 struct device_node *np;
209 struct diu __iomem *diu_reg;
212 unsigned long mode, pix_fmt, res, bpp;
215 np = of_find_compatible_node(NULL, NULL, "fsl,mpc5121-diu");
217 pr_err("No DIU node\n");
221 diu_reg = of_iomap(np, 0);
224 pr_err("Can't map DIU\n");
228 mode = in_be32(&diu_reg->diu_mode);
229 if (mode == MFB_MODE0) {
230 pr_info("%s: DIU OFF\n", __func__);
234 desc = in_be32(&diu_reg->desc[0]);
235 vaddr = ioremap(desc, sizeof(struct diu_ad));
237 pr_err("Can't map DIU area desc.\n");
240 memcpy(&diu_shared_fb.ad0, vaddr, sizeof(struct diu_ad));
241 /* flush fb area descriptor */
242 dst = (unsigned long)&diu_shared_fb.ad0;
243 flush_dcache_range(dst, dst + sizeof(struct diu_ad) - 1);
245 res = in_be32(&diu_reg->disp_size);
246 pix_fmt = in_le32(vaddr);
247 bpp = ((pix_fmt >> 16) & 0x3) + 1;
248 diu_shared_fb.fb_phys = in_le32(vaddr + 4);
249 diu_shared_fb.fb_len = ((res & 0xfff0000) >> 16) * (res & 0xfff) * bpp;
250 diu_shared_fb.in_use = true;
253 desc = in_be32(&diu_reg->gamma);
254 vaddr = ioremap(desc, sizeof(diu_shared_fb.gamma));
256 pr_err("Can't map DIU area desc.\n");
257 diu_shared_fb.in_use = false;
260 memcpy(&diu_shared_fb.gamma, vaddr, sizeof(diu_shared_fb.gamma));
261 /* flush gamma table */
262 dst = (unsigned long)&diu_shared_fb.gamma;
263 flush_dcache_range(dst, dst + sizeof(diu_shared_fb.gamma) - 1);
266 out_be32(&diu_reg->gamma, virt_to_phys(&diu_shared_fb.gamma));
267 out_be32(&diu_reg->desc[1], 0);
268 out_be32(&diu_reg->desc[2], 0);
269 out_be32(&diu_reg->desc[0], virt_to_phys(&diu_shared_fb.ad0));
275 static void __init mpc512x_setup_diu(void)
280 * We do not allocate and configure new area for bitmap buffer
281 * because it would requere copying bitmap data (splash image)
282 * and so negatively affect boot time. Instead we reserve the
283 * already configured frame buffer area so that it won't be
284 * destroyed. The starting address of the area to reserve and
285 * also it's length is passed to reserve_bootmem(). It will be
286 * freed later on first open of fbdev, when splash image is not
289 if (diu_shared_fb.in_use) {
290 ret = reserve_bootmem(diu_shared_fb.fb_phys,
291 diu_shared_fb.fb_len,
294 pr_err("%s: reserve bootmem failed\n", __func__);
295 diu_shared_fb.in_use = false;
299 diu_ops.set_pixel_clock = mpc512x_set_pixel_clock;
300 diu_ops.valid_monitor_port = mpc512x_valid_monitor_port;
301 diu_ops.release_bootmem = mpc512x_release_bootmem;
304 void __init mpc512x_init_IRQ(void)
306 struct device_node *np;
308 np = of_find_compatible_node(NULL, NULL, "fsl,mpc5121-ipic");
316 * Initialize the default interrupt mapping priorities,
317 * in case the boot rom changed something on us.
319 ipic_set_default_priority();
323 * Nodes to do bus probe on, soc and localbus
325 static struct of_device_id __initdata of_bus_ids[] = {
326 { .compatible = "fsl,mpc5121-immr", },
327 { .compatible = "fsl,mpc5121-localbus", },
328 { .compatible = "fsl,mpc5121-mbx", },
329 { .compatible = "fsl,mpc5121-nfc", },
330 { .compatible = "fsl,mpc5121-sram", },
331 { .compatible = "fsl,mpc5121-pci", },
332 { .compatible = "gpio-leds", },
336 static void __init mpc512x_declare_of_platform_devices(void)
338 if (of_platform_bus_probe(NULL, of_bus_ids, NULL))
339 printk(KERN_ERR __FILE__ ": "
340 "Error while probing of_platform bus\n");
343 #define DEFAULT_FIFO_SIZE 16
345 const char *mpc512x_select_psc_compat(void)
347 if (of_machine_is_compatible("fsl,mpc5121"))
348 return "fsl,mpc5121-psc";
350 if (of_machine_is_compatible("fsl,mpc5125"))
351 return "fsl,mpc5125-psc";
356 const char *mpc512x_select_reset_compat(void)
358 if (of_machine_is_compatible("fsl,mpc5121"))
359 return "fsl,mpc5121-reset";
361 if (of_machine_is_compatible("fsl,mpc5125"))
362 return "fsl,mpc5125-reset";
367 static unsigned int __init get_fifo_size(struct device_node *np,
370 const unsigned int *fp;
372 fp = of_get_property(np, prop_name, NULL);
376 pr_warning("no %s property in %s node, defaulting to %d\n",
377 prop_name, np->full_name, DEFAULT_FIFO_SIZE);
379 return DEFAULT_FIFO_SIZE;
382 #define FIFOC(_base) ((struct mpc512x_psc_fifo __iomem *) \
383 ((u32)(_base) + sizeof(struct mpc52xx_psc)))
385 /* Init PSC FIFO space for TX and RX slices */
386 static void __init mpc512x_psc_fifo_init(void)
388 struct device_node *np;
390 unsigned int tx_fifo_size;
391 unsigned int rx_fifo_size;
392 const char *psc_compat;
393 int fifobase = 0; /* current fifo address in 32 bit words */
395 psc_compat = mpc512x_select_psc_compat();
397 pr_err("%s: no compatible devices found\n", __func__);
401 for_each_compatible_node(np, NULL, psc_compat) {
402 tx_fifo_size = get_fifo_size(np, "fsl,tx-fifo-size");
403 rx_fifo_size = get_fifo_size(np, "fsl,rx-fifo-size");
405 /* size in register is in 4 byte units */
413 psc = of_iomap(np, 0);
415 pr_err("%s: Can't map %s device\n",
416 __func__, np->full_name);
420 /* FIFO space is 4KiB, check if requested size is available */
421 if ((fifobase + tx_fifo_size + rx_fifo_size) > 0x1000) {
422 pr_err("%s: no fifo space available for %s\n",
423 __func__, np->full_name);
426 * chances are that another device requests less
427 * fifo space, so we continue.
432 /* set tx and rx fifo size registers */
433 out_be32(&FIFOC(psc)->txsz, (fifobase << 16) | tx_fifo_size);
434 fifobase += tx_fifo_size;
435 out_be32(&FIFOC(psc)->rxsz, (fifobase << 16) | rx_fifo_size);
436 fifobase += rx_fifo_size;
438 /* reset and enable the slices */
439 out_be32(&FIFOC(psc)->txcmd, 0x80);
440 out_be32(&FIFOC(psc)->txcmd, 0x01);
441 out_be32(&FIFOC(psc)->rxcmd, 0x80);
442 out_be32(&FIFOC(psc)->rxcmd, 0x01);
448 void __init mpc512x_init_early(void)
450 mpc512x_restart_init();
451 if (IS_ENABLED(CONFIG_FB_FSL_DIU))
455 void __init mpc512x_init(void)
458 mpc512x_declare_of_platform_devices();
459 mpc512x_psc_fifo_init();
462 void __init mpc512x_setup_arch(void)
464 if (IS_ENABLED(CONFIG_FB_FSL_DIU))
469 * mpc512x_cs_config - Setup chip select configuration
470 * @cs: chip select number
471 * @val: chip select configuration value
473 * Perform chip select configuration for devices on LocalPlus Bus.
474 * Intended to dynamically reconfigure the chip select parameters
475 * for configurable devices on the bus.
477 int mpc512x_cs_config(unsigned int cs, u32 val)
479 static struct mpc512x_lpc __iomem *lpc;
480 struct device_node *np;
486 np = of_find_compatible_node(NULL, NULL, "fsl,mpc5121-lpc");
487 lpc = of_iomap(np, 0);
493 out_be32(&lpc->cs_cfg[cs], val);
496 EXPORT_SYMBOL(mpc512x_cs_config);