u-boot/board/freescale/p1022ds/diu.c

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/*
* Copyright 2010-2011 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 <linux/ctype.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, const char *port)
{
ccsr_gur_t *gur = (void *)(CONFIG_SYS_MPC85xx_GUTS_ADDR);
const char *name;
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);
if (strncmp(port, "lvds", 4) == 0) {
/* Single link LVDS */
temp &= ~PX_BRDCFG1_DVIEN;
/*
* LVDS also needs backlight enabled, otherwise the display
* will be blank.
*/
temp |= (PX_BRDCFG1_DFPEN | PX_BRDCFG1_BACKLIGHT);
name = "Single-Link LVDS";
} else { /* DVI */
/* Enable the DVI port, disable the DFP and the backlight */
temp &= ~(PX_BRDCFG1_DFPEN | PX_BRDCFG1_BACKLIGHT);
temp |= PX_BRDCFG1_DVIEN;
name = "DVI";
}
printf("DIU: Switching to %s monitor @ %ux%u\n", name, xres, 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(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);
}
/*
* 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);
}
/*
* pixis_read - board-specific function to read from the PIXIS
*
* This function overrides the generic pixis_read() function, so that it can
* use PIXIS indirect mode if necessary.
*/
u8 pixis_read(unsigned int reg)
{
ccsr_gur_t *gur = (void *)CONFIG_SYS_MPC85xx_GUTS_ADDR;
/* Use indirect mode if the mux is currently set to DIU mode */
if ((in_be32(&gur->pmuxcr) & PMUXCR_ELBCDIU_MASK) !=
PMUXCR_ELBCDIU_NOR16) {
out_8(lbc_lcs0_ba, reg);
return in_8(lbc_lcs1_ba);
} else {
void *p = (void *)PIXIS_BASE;
return in_8(p + reg);
}
}
/*
* pixis_write - board-specific function to write to the PIXIS
*
* This function overrides the generic pixis_write() function, so that it can
* use PIXIS indirect mode if necessary.
*/
void pixis_write(unsigned int reg, u8 value)
{
ccsr_gur_t *gur = (void *)CONFIG_SYS_MPC85xx_GUTS_ADDR;
/* Use indirect mode if the mux is currently set to DIU mode */
if ((in_be32(&gur->pmuxcr) & PMUXCR_ELBCDIU_MASK) !=
PMUXCR_ELBCDIU_NOR16) {
out_8(lbc_lcs0_ba, reg);
out_8(lbc_lcs1_ba, value);
/* Do a read-back to ensure the write completed */
in_8(lbc_lcs1_ba);
} else {
void *p = (void *)PIXIS_BASE;
out_8(p + reg, value);
}
}
void pixis_bank_reset(void)
{
/*
* For some reason, a PIXIS bank reset does not work if the PIXIS is
* in indirect mode, so switch to direct mode first.
*/
set_mux_to_lbc();
out_8(&pixis->vctl, 0);
out_8(&pixis->vctl, 1);
while (1);
}
#ifdef CONFIG_CFI_FLASH_USE_WEAK_ACCESSORS
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