diff options
Diffstat (limited to 'board/freescale')
| -rw-r--r-- | board/freescale/p1022ds/diu.c | 82 |
1 files changed, 74 insertions, 8 deletions
diff --git a/board/freescale/p1022ds/diu.c b/board/freescale/p1022ds/diu.c index d5428ea..898f4c7 100644 --- a/board/freescale/p1022ds/diu.c +++ b/board/freescale/p1022ds/diu.c @@ -63,6 +63,8 @@ static u8 px_brdcfg0; static u32 pmuxcr; static void *lbc_lcs0_ba; static void *lbc_lcs1_ba; +static u32 old_br0, old_or0, old_br1, old_or1; +static u32 new_br0, new_or0, new_br1, new_or1; void diu_set_pixel_clock(unsigned int pixclock) { @@ -88,10 +90,63 @@ int platform_diu_init(unsigned int xres, unsigned int yres, const char *port) const char *name; u32 pixel_format; u8 temp; + phys_addr_t phys0, phys1; /* BR0/BR1 physical addresses */ - /* Save the LBC LCS0 and LCS1 addresses for the DIU mux functions */ - lbc_lcs0_ba = (void *)(get_lbc_br(0) & get_lbc_or(0) & 0xFFFF8000); - lbc_lcs1_ba = (void *)(get_lbc_br(1) & get_lbc_or(1) & 0xFFFF8000); + /* + * Indirect mode requires both BR0 and BR1 to be set to "GPCM", + * otherwise writes to these addresses won't actually appear on the + * local bus, and so the PIXIS won't see them. + * + * In FCM mode, writes go to the NAND controller, which does not pass + * them to the localbus directly. So we force BR0 and BR1 into GPCM + * mode, since we don't care about what's behind the localbus any + * more. However, we save those registers first, so that we can + * restore them when necessary. + */ + new_br0 = old_br0 = get_lbc_br(0); + new_br1 = old_br1 = get_lbc_br(1); + new_or0 = old_or0 = get_lbc_or(0); + new_or1 = old_or1 = get_lbc_or(1); + + /* + * Use the existing BRx/ORx values if it's already GPCM. Otherwise, + * force the values to simple 32KB GPCM windows with the most + * conservative timing. + */ + if ((old_br0 & BR_MSEL) != BR_MS_GPCM) { + new_br0 = (get_lbc_br(0) & BR_BA) | BR_V; + new_or0 = OR_AM_32KB | 0xFF7; + set_lbc_br(0, new_br0); + set_lbc_or(0, new_or0); + } + if ((old_br1 & BR_MSEL) != BR_MS_GPCM) { + new_br1 = (get_lbc_br(1) & BR_BA) | BR_V; + new_or1 = OR_AM_32KB | 0xFF7; + set_lbc_br(1, new_br1); + set_lbc_or(1, new_or1); + } + + /* + * Determine the physical addresses for Chip Selects 0 and 1. The + * BR0/BR1 registers contain the truncated physical addresses for the + * chip selects, mapped via the localbus LAW. Since the BRx registers + * only contain the lower 32 bits of the address, we have to determine + * the upper 4 bits some other way. The proper way is to scan the LAW + * table looking for a matching localbus address. Instead, we cheat. + * We know that the upper bits are 0 for 32-bit addressing, or 0xF for + * 36-bit addressing. + */ +#ifdef CONFIG_PHYS_64BIT + phys0 = 0xf00000000ULL | (old_br0 & old_or0 & BR_BA); + phys1 = 0xf00000000ULL | (old_br1 & old_or1 & BR_BA); +#else + phys0 = old_br0 & old_or0 & BR_BA; + phys1 = old_br1 & old_or1 & BR_BA; +#endif + + /* Save the LBC LCS0 and LCS1 addresses for the DIU mux functions */ + lbc_lcs0_ba = map_physmem(phys0, 1, 0); + lbc_lcs1_ba = map_physmem(phys1, 1, 0); pixel_format = cpu_to_le32(AD_BYTE_F | (3 << AD_ALPHA_C_SHIFT) | (0 << AD_BLUE_C_SHIFT) | (1 << AD_GREEN_C_SHIFT) | @@ -134,6 +189,7 @@ int platform_diu_init(unsigned int xres, unsigned int yres, const char *port) out_8(lbc_lcs0_ba, offsetof(ngpixis_t, brdcfg0)); px_brdcfg0 = in_8(lbc_lcs1_ba); out_8(lbc_lcs1_ba, px_brdcfg0 | PX_BRDCFG0_ELBC_DIU); + in_8(lbc_lcs1_ba); /* Set PMUXCR to switch the muxed pins from the LBC to the DIU */ clrsetbits_be32(&gur->pmuxcr, PMUXCR_ELBCDIU_MASK, PMUXCR_ELBCDIU_DIU); @@ -168,12 +224,10 @@ static int set_mux_to_lbc(void) * In DIU mode, the PIXIS can only be accessed indirectly * since we can't read/write the LBC directly. */ - /* Set the board mux to LBC. This will disable the display. */ out_8(lbc_lcs0_ba, offsetof(ngpixis_t, brdcfg0)); - px_brdcfg0 = in_8(lbc_lcs1_ba); - out_8(lbc_lcs1_ba, (px_brdcfg0 & ~(PX_BRDCFG0_ELBC_SPI_MASK - | PX_BRDCFG0_ELBC_DIU)) | PX_BRDCFG0_ELBC_SPI_ELBC); + out_8(lbc_lcs1_ba, px_brdcfg0); + in_8(lbc_lcs1_ba); /* Disable indirect PIXIS mode */ out_8(lbc_lcs0_ba, offsetof(ngpixis_t, csr)); @@ -184,6 +238,12 @@ static int set_mux_to_lbc(void) PMUXCR_ELBCDIU_NOR16); in_be32(&gur->pmuxcr); + /* Restore the BR0 and BR1 settings */ + set_lbc_br(0, old_br0); + set_lbc_or(0, old_or0); + set_lbc_br(1, old_br1); + set_lbc_or(1, old_or1); + return 1; } @@ -199,12 +259,18 @@ static void set_mux_to_diu(void) { ccsr_gur_t *gur = (void *)CONFIG_SYS_MPC85xx_GUTS_ADDR; + /* Set BR0 and BR1 to GPCM mode */ + set_lbc_br(0, new_br0); + set_lbc_or(0, new_or0); + set_lbc_br(1, new_br1); + set_lbc_or(1, new_or1); + /* Enable indirect PIXIS mode */ setbits_8(&pixis->csr, PX_CTL_ALTACC); /* Set the board mux to DIU. This will enable the display. */ out_8(lbc_lcs0_ba, offsetof(ngpixis_t, brdcfg0)); - out_8(lbc_lcs1_ba, px_brdcfg0); + out_8(lbc_lcs1_ba, px_brdcfg0 | PX_BRDCFG0_ELBC_DIU); in_8(lbc_lcs1_ba); /* Set the chip mux to DIU mode. */ |