diff options
Diffstat (limited to 'board/freescale/p1022ds/diu.c')
| -rw-r--r-- | board/freescale/p1022ds/diu.c | 208 |
1 files changed, 201 insertions, 7 deletions
diff --git a/board/freescale/p1022ds/diu.c b/board/freescale/p1022ds/diu.c index 5ca84df..12b40a0 100644 --- a/board/freescale/p1022ds/diu.c +++ b/board/freescale/p1022ds/diu.c @@ -18,12 +18,21 @@ #include "../common/ngpixis.h" #include <fsl_diu_fb.h> -#define PX_BRDCFG0_ELBC_DIU 0x02 +/* The CTL register is called 'csr' in the ngpixis_t structure */ +#define PX_CTL_ALTACC 0x80 + +#define PX_BRDCFG0_ELBC_SPI_MASK 0xc0 +#define PX_BRDCFG0_ELBC_SPI_ELBC 0x00 +#define PX_BRDCFG0_ELBC_SPI_NULL 0xc0 +#define PX_BRDCFG0_ELBC_DIU 0x02 #define PX_BRDCFG1_DVIEN 0x80 #define PX_BRDCFG1_DFPEN 0x40 #define PX_BRDCFG1_BACKLIGHT 0x20 +#define PMUXCR_ELBCDIU_MASK 0xc0000000 +#define PMUXCR_ELBCDIU_NOR16 0x80000000 + /* * DIU Area Descriptor * @@ -43,6 +52,16 @@ #define AD_COMP_1_SHIFT 4 #define AD_COMP_0_SHIFT 0 +/* + * Variables used by the DIU/LBC switching code. It's safe to makes these + * global, because the DIU requires DDR, so we'll only run this code after + * relocation. + */ +static u8 px_brdcfg0; +static u32 pmuxcr; +static void *lbc_lcs0_ba; +static void *lbc_lcs1_ba; + void diu_set_pixel_clock(unsigned int pixclock) { ccsr_gur_t *gur = (void *)(CONFIG_SYS_MPC85xx_GUTS_ADDR); @@ -68,6 +87,10 @@ int platform_diu_init(unsigned int *xres, unsigned int *yres) u32 pixel_format; u8 temp; + /* 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); + pixel_format = cpu_to_le32(AD_BYTE_F | (3 << AD_ALPHA_C_SHIFT) | (0 << AD_BLUE_C_SHIFT) | (1 << AD_GREEN_C_SHIFT) | (2 << AD_RED_C_SHIFT) | (8 << AD_COMP_3_SHIFT) | @@ -94,17 +117,188 @@ int platform_diu_init(unsigned int *xres, unsigned int *yres) out_8(&pixis->brdcfg1, temp); /* + * Enable PIXIS indirect access mode. This is a hack that allows us to + * access PIXIS registers even when the LBC pins have been muxed to the + * DIU. + */ + setbits_8(&pixis->csr, PX_CTL_ALTACC); + + /* * Route the LAD pins to the DIU. This will disable access to the eLBC, * which means we won't be able to read/write any NOR flash addresses! */ - out_8(&pixis->brdcfg0, in_8(&pixis->brdcfg0) | PX_BRDCFG0_ELBC_DIU); - /* we must do the dummy read from eLBC to sync the write as above */ - in_8(&pixis->brdcfg0); + 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); /* Setting PMUXCR to switch to DVI from ELBC */ - /* Set pmuxcr to allow both i2c1 and i2c2 */ - clrsetbits_be32(&gur->pmuxcr, 0xc0000000, 0x40000000); - in_be32(&gur->pmuxcr); + clrsetbits_be32(&gur->pmuxcr, + PMUXCR_ELBCDIU_MASK, PMUXCR_ELBCDIU_NOR16); + pmuxcr = in_be32(&gur->pmuxcr); return fsl_diu_init(*xres, pixel_format, 0); } + +#ifdef CONFIG_CFI_FLASH_USE_WEAK_ACCESSORS + +/* + * set_mux_to_lbc - disable the DIU so that we can read/write to elbc + * + * On the Freescale P1022, the DIU video signal and the LBC address/data lines + * share the same pins, which means that when the DIU is active (e.g. the + * console is on the DVI display), NOR flash cannot be accessed. So we use the + * weak accessor feature of the CFI flash code to temporarily switch the pin + * mux from DIU to LBC whenever we want to read or write flash. This has a + * significant performance penalty, but it's the only way to make it work. + * + * There are two muxes: one on the chip, and one on the board. The chip mux + * controls whether the pins are used for the DIU or the LBC, and it is + * set via PMUXCR. The board mux controls whether those signals go to + * the video connector or the NOR flash chips, and it is set via the ngPIXIS. + */ +static int set_mux_to_lbc(void) +{ + ccsr_gur_t *gur = (void *)CONFIG_SYS_MPC85xx_GUTS_ADDR; + + /* Switch the muxes only if they're currently set to DIU mode */ + if ((in_be32(&gur->pmuxcr) & PMUXCR_ELBCDIU_MASK) == + PMUXCR_ELBCDIU_NOR16) { + /* + * 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); + + /* Disable indirect PIXIS mode */ + out_8(lbc_lcs0_ba, offsetof(ngpixis_t, csr)); + clrbits_8(lbc_lcs1_ba, PX_CTL_ALTACC); + + /* Set the chip mux to LBC mode, so that writes go to flash. */ + out_be32(&gur->pmuxcr, (pmuxcr & ~PMUXCR_ELBCDIU_MASK) | + PMUXCR_ELBCDIU_NOR16); + in_be32(&gur->pmuxcr); + + return 1; + } + + return 0; +} + +/* + * set_mux_to_diu - re-enable the DIU muxing + * + * This function restores the chip and board muxing to point to the DIU. + */ +static void set_mux_to_diu(void) +{ + ccsr_gur_t *gur = (void *)CONFIG_SYS_MPC85xx_GUTS_ADDR; + + /* 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); + in_8(lbc_lcs1_ba); + + /* Set the chip mux to DIU mode. */ + out_be32(&gur->pmuxcr, pmuxcr); + in_be32(&gur->pmuxcr); +} + +void flash_write8(u8 value, void *addr) +{ + int sw = set_mux_to_lbc(); + + __raw_writeb(value, addr); + if (sw) + set_mux_to_diu(); +} + +void flash_write16(u16 value, void *addr) +{ + int sw = set_mux_to_lbc(); + + __raw_writew(value, addr); + if (sw) + set_mux_to_diu(); +} + +void flash_write32(u32 value, void *addr) +{ + int sw = set_mux_to_lbc(); + + __raw_writel(value, addr); + if (sw) + set_mux_to_diu(); +} + +void flash_write64(u64 value, void *addr) +{ + int sw = set_mux_to_lbc(); + + /* There is no __raw_writeq(), so do the write manually */ + *(volatile u64 *)addr = value; + if (sw) + set_mux_to_diu(); +} + +u8 flash_read8(void *addr) +{ + u8 ret; + + int sw = set_mux_to_lbc(); + + ret = __raw_readb(addr); + if (sw) + set_mux_to_diu(); + + return ret; +} + +u16 flash_read16(void *addr) +{ + u16 ret; + + int sw = set_mux_to_lbc(); + + ret = __raw_readw(addr); + if (sw) + set_mux_to_diu(); + + return ret; +} + +u32 flash_read32(void *addr) +{ + u32 ret; + + int sw = set_mux_to_lbc(); + + ret = __raw_readl(addr); + if (sw) + set_mux_to_diu(); + + return ret; +} + +u64 flash_read64(void *addr) +{ + u64 ret; + + int sw = set_mux_to_lbc(); + + /* There is no __raw_readq(), so do the read manually */ + ret = *(volatile u64 *)addr; + if (sw) + set_mux_to_diu(); + + return ret; +} + +#endif |