2 * Copyright 2010-2011 Freescale Semiconductor, Inc.
5 * FSL DIU Framebuffer driver
7 * SPDX-License-Identifier: GPL-2.0+
12 #include <linux/ctype.h>
14 #include <stdio_dev.h>
16 #include "../common/ngpixis.h"
17 #include <fsl_diu_fb.h>
19 /* The CTL register is called 'csr' in the ngpixis_t structure */
20 #define PX_CTL_ALTACC 0x80
22 #define PX_BRDCFG0_ELBC_SPI_MASK 0xc0
23 #define PX_BRDCFG0_ELBC_SPI_ELBC 0x00
24 #define PX_BRDCFG0_ELBC_SPI_NULL 0xc0
25 #define PX_BRDCFG0_ELBC_DIU 0x02
27 #define PX_BRDCFG1_DVIEN 0x80
28 #define PX_BRDCFG1_DFPEN 0x40
29 #define PX_BRDCFG1_BACKLIGHT 0x20
31 #define PMUXCR_ELBCDIU_MASK 0xc0000000
32 #define PMUXCR_ELBCDIU_NOR16 0x80000000
33 #define PMUXCR_ELBCDIU_DIU 0x40000000
38 * Note that we need to byte-swap the value before it's written to the AD
39 * register. So even though the registers don't look like they're in the same
40 * bit positions as they are on the MPC8610, the same value is written to the
41 * AD register on the MPC8610 and on the P1022.
43 #define AD_BYTE_F 0x10000000
44 #define AD_ALPHA_C_SHIFT 25
45 #define AD_BLUE_C_SHIFT 23
46 #define AD_GREEN_C_SHIFT 21
47 #define AD_RED_C_SHIFT 19
48 #define AD_PIXEL_S_SHIFT 16
49 #define AD_COMP_3_SHIFT 12
50 #define AD_COMP_2_SHIFT 8
51 #define AD_COMP_1_SHIFT 4
52 #define AD_COMP_0_SHIFT 0
55 * Variables used by the DIU/LBC switching code. It's safe to makes these
56 * global, because the DIU requires DDR, so we'll only run this code after
61 static void *lbc_lcs0_ba;
62 static void *lbc_lcs1_ba;
63 static u32 old_br0, old_or0, old_br1, old_or1;
64 static u32 new_br0, new_or0, new_br1, new_or1;
66 void diu_set_pixel_clock(unsigned int pixclock)
68 ccsr_gur_t *gur = (void *)(CONFIG_SYS_MPC85xx_GUTS_ADDR);
69 unsigned long speed_ccb, temp;
72 speed_ccb = get_bus_freq(0);
73 temp = 1000000000 / pixclock;
75 pixval = speed_ccb / temp;
76 debug("DIU pixval = %u\n", pixval);
78 /* Modify PXCLK in GUTS CLKDVDR */
79 temp = in_be32(&gur->clkdvdr) & 0x2000FFFF;
80 out_be32(&gur->clkdvdr, temp); /* turn off clock */
81 out_be32(&gur->clkdvdr, temp | 0x80000000 | ((pixval & 0x1F) << 16));
84 int platform_diu_init(unsigned int xres, unsigned int yres, const char *port)
86 ccsr_gur_t *gur = (void *)(CONFIG_SYS_MPC85xx_GUTS_ADDR);
90 phys_addr_t phys0, phys1; /* BR0/BR1 physical addresses */
93 * Indirect mode requires both BR0 and BR1 to be set to "GPCM",
94 * otherwise writes to these addresses won't actually appear on the
95 * local bus, and so the PIXIS won't see them.
97 * In FCM mode, writes go to the NAND controller, which does not pass
98 * them to the localbus directly. So we force BR0 and BR1 into GPCM
99 * mode, since we don't care about what's behind the localbus any
100 * more. However, we save those registers first, so that we can
101 * restore them when necessary.
103 new_br0 = old_br0 = get_lbc_br(0);
104 new_br1 = old_br1 = get_lbc_br(1);
105 new_or0 = old_or0 = get_lbc_or(0);
106 new_or1 = old_or1 = get_lbc_or(1);
109 * Use the existing BRx/ORx values if it's already GPCM. Otherwise,
110 * force the values to simple 32KB GPCM windows with the most
111 * conservative timing.
113 if ((old_br0 & BR_MSEL) != BR_MS_GPCM) {
114 new_br0 = (get_lbc_br(0) & BR_BA) | BR_V;
115 new_or0 = OR_AM_32KB | 0xFF7;
116 set_lbc_br(0, new_br0);
117 set_lbc_or(0, new_or0);
119 if ((old_br1 & BR_MSEL) != BR_MS_GPCM) {
120 new_br1 = (get_lbc_br(1) & BR_BA) | BR_V;
121 new_or1 = OR_AM_32KB | 0xFF7;
122 set_lbc_br(1, new_br1);
123 set_lbc_or(1, new_or1);
127 * Determine the physical addresses for Chip Selects 0 and 1. The
128 * BR0/BR1 registers contain the truncated physical addresses for the
129 * chip selects, mapped via the localbus LAW. Since the BRx registers
130 * only contain the lower 32 bits of the address, we have to determine
131 * the upper 4 bits some other way. The proper way is to scan the LAW
132 * table looking for a matching localbus address. Instead, we cheat.
133 * We know that the upper bits are 0 for 32-bit addressing, or 0xF for
136 #ifdef CONFIG_PHYS_64BIT
137 phys0 = 0xf00000000ULL | (old_br0 & old_or0 & BR_BA);
138 phys1 = 0xf00000000ULL | (old_br1 & old_or1 & BR_BA);
140 phys0 = old_br0 & old_or0 & BR_BA;
141 phys1 = old_br1 & old_or1 & BR_BA;
144 /* Save the LBC LCS0 and LCS1 addresses for the DIU mux functions */
145 lbc_lcs0_ba = map_physmem(phys0, 1, 0);
146 lbc_lcs1_ba = map_physmem(phys1, 1, 0);
148 pixel_format = cpu_to_le32(AD_BYTE_F | (3 << AD_ALPHA_C_SHIFT) |
149 (0 << AD_BLUE_C_SHIFT) | (1 << AD_GREEN_C_SHIFT) |
150 (2 << AD_RED_C_SHIFT) | (8 << AD_COMP_3_SHIFT) |
151 (8 << AD_COMP_2_SHIFT) | (8 << AD_COMP_1_SHIFT) |
152 (8 << AD_COMP_0_SHIFT) | (3 << AD_PIXEL_S_SHIFT));
154 temp = in_8(&pixis->brdcfg1);
156 if (strncmp(port, "lvds", 4) == 0) {
157 /* Single link LVDS */
158 temp &= ~PX_BRDCFG1_DVIEN;
160 * LVDS also needs backlight enabled, otherwise the display
163 temp |= (PX_BRDCFG1_DFPEN | PX_BRDCFG1_BACKLIGHT);
164 name = "Single-Link LVDS";
166 /* Enable the DVI port, disable the DFP and the backlight */
167 temp &= ~(PX_BRDCFG1_DFPEN | PX_BRDCFG1_BACKLIGHT);
168 temp |= PX_BRDCFG1_DVIEN;
172 printf("DIU: Switching to %s monitor @ %ux%u\n", name, xres, yres);
173 out_8(&pixis->brdcfg1, temp);
176 * Enable PIXIS indirect access mode. This is a hack that allows us to
177 * access PIXIS registers even when the LBC pins have been muxed to the
180 setbits_8(&pixis->csr, PX_CTL_ALTACC);
183 * Route the LAD pins to the DIU. This will disable access to the eLBC,
184 * which means we won't be able to read/write any NOR flash addresses!
186 out_8(lbc_lcs0_ba, offsetof(ngpixis_t, brdcfg0));
187 px_brdcfg0 = in_8(lbc_lcs1_ba);
188 out_8(lbc_lcs1_ba, px_brdcfg0 | PX_BRDCFG0_ELBC_DIU);
191 /* Set PMUXCR to switch the muxed pins from the LBC to the DIU */
192 clrsetbits_be32(&gur->pmuxcr, PMUXCR_ELBCDIU_MASK, PMUXCR_ELBCDIU_DIU);
193 pmuxcr = in_be32(&gur->pmuxcr);
195 return fsl_diu_init(xres, yres, pixel_format, 0);
199 * set_mux_to_lbc - disable the DIU so that we can read/write to elbc
201 * On the Freescale P1022, the DIU video signal and the LBC address/data lines
202 * share the same pins, which means that when the DIU is active (e.g. the
203 * console is on the DVI display), NOR flash cannot be accessed. So we use the
204 * weak accessor feature of the CFI flash code to temporarily switch the pin
205 * mux from DIU to LBC whenever we want to read or write flash. This has a
206 * significant performance penalty, but it's the only way to make it work.
208 * There are two muxes: one on the chip, and one on the board. The chip mux
209 * controls whether the pins are used for the DIU or the LBC, and it is
210 * set via PMUXCR. The board mux controls whether those signals go to
211 * the video connector or the NOR flash chips, and it is set via the ngPIXIS.
213 static int set_mux_to_lbc(void)
215 ccsr_gur_t *gur = (void *)CONFIG_SYS_MPC85xx_GUTS_ADDR;
217 /* Switch the muxes only if they're currently set to DIU mode */
218 if ((in_be32(&gur->pmuxcr) & PMUXCR_ELBCDIU_MASK) !=
219 PMUXCR_ELBCDIU_NOR16) {
221 * In DIU mode, the PIXIS can only be accessed indirectly
222 * since we can't read/write the LBC directly.
224 /* Set the board mux to LBC. This will disable the display. */
225 out_8(lbc_lcs0_ba, offsetof(ngpixis_t, brdcfg0));
226 out_8(lbc_lcs1_ba, px_brdcfg0);
229 /* Disable indirect PIXIS mode */
230 out_8(lbc_lcs0_ba, offsetof(ngpixis_t, csr));
231 clrbits_8(lbc_lcs1_ba, PX_CTL_ALTACC);
233 /* Set the chip mux to LBC mode, so that writes go to flash. */
234 out_be32(&gur->pmuxcr, (pmuxcr & ~PMUXCR_ELBCDIU_MASK) |
235 PMUXCR_ELBCDIU_NOR16);
236 in_be32(&gur->pmuxcr);
238 /* Restore the BR0 and BR1 settings */
239 set_lbc_br(0, old_br0);
240 set_lbc_or(0, old_or0);
241 set_lbc_br(1, old_br1);
242 set_lbc_or(1, old_or1);
251 * set_mux_to_diu - re-enable the DIU muxing
253 * This function restores the chip and board muxing to point to the DIU.
255 static void set_mux_to_diu(void)
257 ccsr_gur_t *gur = (void *)CONFIG_SYS_MPC85xx_GUTS_ADDR;
259 /* Set BR0 and BR1 to GPCM mode */
260 set_lbc_br(0, new_br0);
261 set_lbc_or(0, new_or0);
262 set_lbc_br(1, new_br1);
263 set_lbc_or(1, new_or1);
265 /* Enable indirect PIXIS mode */
266 setbits_8(&pixis->csr, PX_CTL_ALTACC);
268 /* Set the board mux to DIU. This will enable the display. */
269 out_8(lbc_lcs0_ba, offsetof(ngpixis_t, brdcfg0));
270 out_8(lbc_lcs1_ba, px_brdcfg0 | PX_BRDCFG0_ELBC_DIU);
273 /* Set the chip mux to DIU mode. */
274 out_be32(&gur->pmuxcr, pmuxcr);
275 in_be32(&gur->pmuxcr);
279 * pixis_read - board-specific function to read from the PIXIS
281 * This function overrides the generic pixis_read() function, so that it can
282 * use PIXIS indirect mode if necessary.
284 u8 pixis_read(unsigned int reg)
286 ccsr_gur_t *gur = (void *)CONFIG_SYS_MPC85xx_GUTS_ADDR;
288 /* Use indirect mode if the mux is currently set to DIU mode */
289 if ((in_be32(&gur->pmuxcr) & PMUXCR_ELBCDIU_MASK) !=
290 PMUXCR_ELBCDIU_NOR16) {
291 out_8(lbc_lcs0_ba, reg);
292 return in_8(lbc_lcs1_ba);
294 void *p = (void *)PIXIS_BASE;
296 return in_8(p + reg);
301 * pixis_write - board-specific function to write to the PIXIS
303 * This function overrides the generic pixis_write() function, so that it can
304 * use PIXIS indirect mode if necessary.
306 void pixis_write(unsigned int reg, u8 value)
308 ccsr_gur_t *gur = (void *)CONFIG_SYS_MPC85xx_GUTS_ADDR;
310 /* Use indirect mode if the mux is currently set to DIU mode */
311 if ((in_be32(&gur->pmuxcr) & PMUXCR_ELBCDIU_MASK) !=
312 PMUXCR_ELBCDIU_NOR16) {
313 out_8(lbc_lcs0_ba, reg);
314 out_8(lbc_lcs1_ba, value);
315 /* Do a read-back to ensure the write completed */
318 void *p = (void *)PIXIS_BASE;
320 out_8(p + reg, value);
324 void pixis_bank_reset(void)
327 * For some reason, a PIXIS bank reset does not work if the PIXIS is
328 * in indirect mode, so switch to direct mode first.
332 out_8(&pixis->vctl, 0);
333 out_8(&pixis->vctl, 1);
338 #ifdef CONFIG_CFI_FLASH_USE_WEAK_ACCESSORS
340 void flash_write8(u8 value, void *addr)
342 int sw = set_mux_to_lbc();
344 __raw_writeb(value, addr);
347 * To ensure the post-write is completed to eLBC, software must
348 * perform a dummy read from one valid address from eLBC space
349 * before changing the eLBC_DIU from NOR mode to DIU mode.
350 * set_mux_to_diu() includes a sync that will ensure the
351 * __raw_readb() completes before it switches the mux.
358 void flash_write16(u16 value, void *addr)
360 int sw = set_mux_to_lbc();
362 __raw_writew(value, addr);
365 * To ensure the post-write is completed to eLBC, software must
366 * perform a dummy read from one valid address from eLBC space
367 * before changing the eLBC_DIU from NOR mode to DIU mode.
368 * set_mux_to_diu() includes a sync that will ensure the
369 * __raw_readb() completes before it switches the mux.
376 void flash_write32(u32 value, void *addr)
378 int sw = set_mux_to_lbc();
380 __raw_writel(value, addr);
383 * To ensure the post-write is completed to eLBC, software must
384 * perform a dummy read from one valid address from eLBC space
385 * before changing the eLBC_DIU from NOR mode to DIU mode.
386 * set_mux_to_diu() includes a sync that will ensure the
387 * __raw_readb() completes before it switches the mux.
394 void flash_write64(u64 value, void *addr)
396 int sw = set_mux_to_lbc();
400 * There is no __raw_writeq(), so do the write manually. We don't trust
401 * the compiler, so we use inline assembly.
403 __asm__ __volatile__(
406 : "=m" (*p), "=m" (*(p + 1))
407 : "r" ((uint32_t) (value >> 32)), "r" ((uint32_t) (value)));
411 * To ensure the post-write is completed to eLBC, software must
412 * perform a dummy read from one valid address from eLBC space
413 * before changing the eLBC_DIU from NOR mode to DIU mode. We
414 * read addr+4 because we just wrote to addr+4, so that's how we
415 * maintain execution order. set_mux_to_diu() includes a sync
416 * that will ensure the __raw_readb() completes before it
419 __raw_readb(addr + 4);
424 u8 flash_read8(void *addr)
428 int sw = set_mux_to_lbc();
430 ret = __raw_readb(addr);
437 u16 flash_read16(void *addr)
441 int sw = set_mux_to_lbc();
443 ret = __raw_readw(addr);
450 u32 flash_read32(void *addr)
454 int sw = set_mux_to_lbc();
456 ret = __raw_readl(addr);
463 u64 flash_read64(void *addr)
467 int sw = set_mux_to_lbc();
469 /* There is no __raw_readq(), so do the read manually */
470 ret = *(volatile u64 *)addr;