#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
*
#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);
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) |
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
projects / u-boot / commitdiff