1 files changed, 351 insertions, 0 deletions
diff --git a/u-boot/board/freescale/p1022ds/diu.c b/u-boot/board/freescale/p1022ds/diu.c
new file mode 100644
index 0000000..8f5305c
--- /dev/null
+++ b/u-boot/board/freescale/p1022ds/diu.c
@@ -0,0 +1,351 @@
+/*
+ * Copyright 2010 Freescale Semiconductor, Inc.
+ * Authors: Timur Tabi <timur@freescale.com>
+ *
+ * FSL DIU Framebuffer driver
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ */
+
+#include <common.h>
+#include <command.h>
+#include <asm/io.h>
+#include <stdio_dev.h>
+#include <video_fb.h>
+#include "../common/ngpixis.h"
+#include <fsl_diu_fb.h>
+
+/* 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
+#define PMUXCR_ELBCDIU_DIU	0x40000000
+
+/*
+ * DIU Area Descriptor
+ *
+ * Note that we need to byte-swap the value before it's written to the AD
+ * register.  So even though the registers don't look like they're in the same
+ * bit positions as they are on the MPC8610, the same value is written to the
+ * AD register on the MPC8610 and on the P1022.
+ */
+#define AD_BYTE_F		0x10000000
+#define AD_ALPHA_C_SHIFT	25
+#define AD_BLUE_C_SHIFT		23
+#define AD_GREEN_C_SHIFT	21
+#define AD_RED_C_SHIFT		19
+#define AD_PIXEL_S_SHIFT	16
+#define AD_COMP_3_SHIFT		12
+#define AD_COMP_2_SHIFT		8
+#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);
+	unsigned long speed_ccb, temp;
+	u32 pixval;
+
+	speed_ccb = get_bus_freq(0);
+	temp = 1000000000 / pixclock;
+	temp *= 1000;
+	pixval = speed_ccb / temp;
+	debug("DIU pixval = %lu\n", pixval);
+
+	/* Modify PXCLK in GUTS CLKDVDR */
+	temp = in_be32(&gur->clkdvdr) & 0x2000FFFF;
+	out_be32(&gur->clkdvdr, temp);			/* turn off clock */
+	out_be32(&gur->clkdvdr, temp | 0x80000000 | ((pixval & 0x1F) << 16));
+}
+
+int platform_diu_init(unsigned int *xres, unsigned int *yres)
+{
+	ccsr_gur_t *gur = (void *)(CONFIG_SYS_MPC85xx_GUTS_ADDR);
+	char *monitor_port;
+	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) |
+		(8 << AD_COMP_2_SHIFT) | (8 << AD_COMP_1_SHIFT) |
+		(8 << AD_COMP_0_SHIFT) | (3 << AD_PIXEL_S_SHIFT));
+
+	temp = in_8(&pixis->brdcfg1);
+
+	monitor_port = getenv("monitor");
+	if (!strncmp(monitor_port, "1", 1)) { /* 1 - Single link LVDS */
+		*xres = 1024;
+		*yres = 768;
+		/* Enable the DFP port, disable the DVI and the backlight */
+		temp &= ~(PX_BRDCFG1_DVIEN | PX_BRDCFG1_BACKLIGHT);
+		temp |= PX_BRDCFG1_DFPEN;
+	} else {	/* DVI */
+		*xres = 1280;
+		*yres = 1024;
+		/* Enable the DVI port, disable the DFP and the backlight */
+		temp &= ~(PX_BRDCFG1_DFPEN | PX_BRDCFG1_BACKLIGHT);
+		temp |= PX_BRDCFG1_DVIEN;
+	}
+
+	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(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);
+
+	/* Set PMUXCR to switch the muxed pins from the LBC to the DIU */
+	clrsetbits_be32(&gur->pmuxcr, PMUXCR_ELBCDIU_MASK, PMUXCR_ELBCDIU_DIU);
+	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) {
+		/*
+		 * To ensure the post-write is completed to eLBC, software must
+		 * perform a dummy read from one valid address from eLBC space
+		 * before changing the eLBC_DIU from NOR mode to DIU mode.
+		 * set_mux_to_diu() includes a sync that will ensure the
+		 * __raw_readb() completes before it switches the mux.
+		 */
+		__raw_readb(addr);
+		set_mux_to_diu();
+	}
+}
+
+void flash_write16(u16 value, void *addr)
+{
+	int sw = set_mux_to_lbc();
+
+	__raw_writew(value, addr);
+	if (sw) {
+		/*
+		 * To ensure the post-write is completed to eLBC, software must
+		 * perform a dummy read from one valid address from eLBC space
+		 * before changing the eLBC_DIU from NOR mode to DIU mode.
+		 * set_mux_to_diu() includes a sync that will ensure the
+		 * __raw_readb() completes before it switches the mux.
+		 */
+		__raw_readb(addr);
+		set_mux_to_diu();
+	}
+}
+
+void flash_write32(u32 value, void *addr)
+{
+	int sw = set_mux_to_lbc();
+
+	__raw_writel(value, addr);
+	if (sw) {
+		/*
+		 * To ensure the post-write is completed to eLBC, software must
+		 * perform a dummy read from one valid address from eLBC space
+		 * before changing the eLBC_DIU from NOR mode to DIU mode.
+		 * set_mux_to_diu() includes a sync that will ensure the
+		 * __raw_readb() completes before it switches the mux.
+		 */
+		__raw_readb(addr);
+		set_mux_to_diu();
+	}
+}
+
+void flash_write64(u64 value, void *addr)
+{
+	int sw = set_mux_to_lbc();
+	uint32_t *p = addr;
+
+	/*
+	 * There is no __raw_writeq(), so do the write manually.  We don't trust
+	 * the compiler, so we use inline assembly.
+	 */
+	__asm__ __volatile__(
+		"stw%U0%X0 %2,%0;\n"
+		"stw%U1%X1 %3,%1;\n"
+		: "=m" (*p), "=m" (*(p + 1))
+		: "r" ((uint32_t) (value >> 32)), "r" ((uint32_t) (value)));
+
+	if (sw) {
+		/*
+		 * To ensure the post-write is completed to eLBC, software must
+		 * perform a dummy read from one valid address from eLBC space
+		 * before changing the eLBC_DIU from NOR mode to DIU mode.  We
+		 * read addr+4 because we just wrote to addr+4, so that's how we
+		 * maintain execution order.  set_mux_to_diu() includes a sync
+		 * that will ensure the __raw_readb() completes before it
+		 * switches the mux.
+		 */
+		__raw_readb(addr + 4);
+		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