/* * P1022DS board specific routines * * Authors: Travis Wheatley <travis.wheatley@freescale.com> * Dave Liu <daveliu@freescale.com> * Timur Tabi <timur@freescale.com> * * Copyright 2010 Freescale Semiconductor, Inc. * * This file is taken from the Freescale P1022DS BSP, with modifications: * 2) No AMP support * 3) No PCI endpoint support * * This file is licensed under the terms of the GNU General Public License * version 2. This program is licensed "as is" without any warranty of any * kind, whether express or implied.
*/
/* * Board-specific initialization of the DIU. This code should probably be * executed when the DIU is opened, rather than in arch code, but the DIU * driver does not have a mechanism for this (yet). * * This is especially problematic on the P1022DS because the local bus (eLBC) * and the DIU video signals share the same pins, which means that enabling the * DIU will disable access to NOR flash.
*/
/* DIU Pixel Clock bits of the CLKDVDR Global Utilities register */ #define CLKDVDR_PXCKEN 0x80000000 #define CLKDVDR_PXCKINV 0x10000000 #define CLKDVDR_PXCKDLY 0x06000000 #define CLKDVDR_PXCLK_MASK 0x00FF0000
/* * 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_MASK 0x0E000000 #define AD_ALPHA_C_SHIFT 25 #define AD_BLUE_C_MASK 0x01800000 #define AD_BLUE_C_SHIFT 23 #define AD_GREEN_C_MASK 0x00600000 #define AD_GREEN_C_SHIFT 21 #define AD_RED_C_MASK 0x00180000 #define AD_RED_C_SHIFT 19 #define AD_PALETTE 0x00040000 #define AD_PIXEL_S_MASK 0x00030000 #define AD_PIXEL_S_SHIFT 16 #define AD_COMP_3_MASK 0x0000F000 #define AD_COMP_3_SHIFT 12 #define AD_COMP_2_MASK 0x00000F00 #define AD_COMP_2_SHIFT 8 #define AD_COMP_1_MASK 0x000000F0 #define AD_COMP_1_SHIFT 4 #define AD_COMP_0_MASK 0x0000000F #define AD_COMP_0_SHIFT 0
/* * Map a BRx value to a physical address * * The localbus BRx registers only store the lower 32 bits of the address. To * obtain the upper four bits, we need to scan the LAW table. The entry which * maps to the localbus will contain the upper four bits.
*/ static phys_addr_t lbc_br_to_phys(constvoid *ecm, unsignedint count, u32 br)
{ #ifndef CONFIG_PHYS_64BIT /* * If we only have 32-bit addressing, then the BRx address *is* the * physical address.
*/ return br & BR_BA; #else conststruct fsl_law *law = ecm + 0xc08; unsignedint i;
for (i = 0; i < count; i++) {
u64 lawbar = in_be32(&law[i].lawbar);
u32 lawar = in_be32(&law[i].lawar);
if ((lawar & LAWAR_MASK) == LAWAR_MATCH) /* Extract the upper four bits */ return (br & BR_BA) | ((lawbar & LAWBAR_MASK) << 12);
}
lbc = of_iomap(lbc_node, 0); if (!lbc) {
pr_err("p1022ds: could not map localbus node\n"); gotoexit;
}
law_node = of_find_compatible_node(NULL, NULL, "fsl,ecm-law"); if (!law_node) {
pr_err("p1022ds: missing local access window node\n"); gotoexit;
}
ecm = of_iomap(law_node, 0); if (!ecm) {
pr_err("p1022ds: could not map local access window node\n"); gotoexit;
}
iprop = of_get_property(law_node, "fsl,num-laws", NULL); if (!iprop) {
pr_err("p1022ds: LAW node is missing fsl,num-laws property\n"); gotoexit;
}
num_laws = be32_to_cpup(iprop);
/* * 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.
*/
br0 = in_be32(&lbc->bank[0].br);
br1 = in_be32(&lbc->bank[1].br);
or0 = in_be32(&lbc->bank[0].or);
or1 = in_be32(&lbc->bank[1].or);
/* Make sure CS0 and CS1 are programmed */ if (!(br0 & BR_V) || !(br1 & BR_V)) {
pr_err("p1022ds: CS0 and/or CS1 is not programmed\n"); gotoexit;
}
/* * 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 ((br0 & BR_MSEL) != BR_MS_GPCM) {
br0 = (br0 & BR_BA) | BR_V;
or0 = 0xFFFF8000 | 0xFF7;
out_be32(&lbc->bank[0].br, br0);
out_be32(&lbc->bank[0].or, or0);
} if ((br1 & BR_MSEL) != BR_MS_GPCM) {
br1 = (br1 & BR_BA) | BR_V;
or1 = 0xFFFF8000 | 0xFF7;
out_be32(&lbc->bank[1].br, br1);
out_be32(&lbc->bank[1].or, or1);
}
cs0_addr = lbc_br_to_phys(ecm, num_laws, br0); if (!cs0_addr) {
pr_err("p1022ds: could not determine physical address for CS0" " (BR0=%08x)\n", br0); gotoexit;
}
cs1_addr = lbc_br_to_phys(ecm, num_laws, br1); if (!cs1_addr) {
pr_err("p1022ds: could not determine physical address for CS1" " (BR1=%08x)\n", br1); gotoexit;
}
lbc_lcs0_ba = ioremap(cs0_addr, 1); if (!lbc_lcs0_ba) {
pr_err("p1022ds: could not ioremap CS0 address %llx\n",
(unsignedlonglong)cs0_addr); gotoexit;
}
lbc_lcs1_ba = ioremap(cs1_addr, 1); if (!lbc_lcs1_ba) {
pr_err("p1022ds: could not ioremap CS1 address %llx\n",
(unsignedlonglong)cs1_addr); gotoexit;
}
/* Make sure we're in indirect mode first. */ if ((in_be32(&guts->pmuxcr) & PMUXCR_ELBCDIU_MASK) !=
PMUXCR_ELBCDIU_DIU) { struct device_node *pixis_node; void __iomem *pixis;
/* Switch the board mux to the DIU */
out_8(lbc_lcs0_ba, PX_BRDCFG0); /* BRDCFG0 */
b = in_8(lbc_lcs1_ba);
b |= PX_BRDCFG0_ELBC_DIU;
out_8(lbc_lcs1_ba, b);
/* Set the chip mux to DIU mode. */
clrsetbits_be32(&guts->pmuxcr, PMUXCR_ELBCDIU_MASK,
PMUXCR_ELBCDIU_DIU);
in_be32(&guts->pmuxcr);
}
switch (port) { case FSL_DIU_PORT_DVI: /* Enable the DVI port, disable the DFP and the backlight */
out_8(lbc_lcs0_ba, PX_BRDCFG1);
b = in_8(lbc_lcs1_ba);
b &= ~(PX_BRDCFG1_DFPEN | PX_BRDCFG1_BACKLIGHT);
b |= PX_BRDCFG1_DVIEN;
out_8(lbc_lcs1_ba, b); break; case FSL_DIU_PORT_LVDS: /* * LVDS also needs backlight enabled, otherwise the display * will be blank.
*/ /* Enable the DFP port, disable the DVI and the backlight */
out_8(lbc_lcs0_ba, PX_BRDCFG1);
b = in_8(lbc_lcs1_ba);
b &= ~PX_BRDCFG1_DVIEN;
b |= PX_BRDCFG1_DFPEN | PX_BRDCFG1_BACKLIGHT;
out_8(lbc_lcs1_ba, b); break; default:
pr_err("p1022ds: unsupported monitor port %i\n", port);
}
exit: if (lbc_lcs1_ba)
iounmap(lbc_lcs1_ba); if (lbc_lcs0_ba)
iounmap(lbc_lcs0_ba); if (lbc)
iounmap(lbc); if (ecm)
iounmap(ecm); if (guts)
iounmap(guts);
/** * p1022ds_set_pixel_clock: program the DIU's clock * * @pixclock: the wavelength, in picoseconds, of the clock
*/ staticvoid p1022ds_set_pixel_clock(unsignedint pixclock)
{ struct device_node *guts_np = NULL; struct ccsr_guts __iomem *guts; unsignedlong freq;
u64 temp;
u32 pxclk;
/* Map the global utilities registers. */
guts_np = of_find_compatible_node(NULL, NULL, "fsl,p1022-guts"); if (!guts_np) {
pr_err("p1022ds: missing global utilities device node\n"); return;
}
guts = of_iomap(guts_np, 0);
of_node_put(guts_np); if (!guts) {
pr_err("p1022ds: could not map global utilities device\n"); return;
}
/* Convert pixclock from a wavelength to a frequency */
temp = 1000000000000ULL;
do_div(temp, pixclock);
freq = temp;
/* * 'pxclk' is the ratio of the platform clock to the pixel clock. * This number is programmed into the CLKDVDR register, and the valid * range of values is 2-255.
*/
pxclk = DIV_ROUND_CLOSEST(fsl_get_sys_freq(), freq);
pxclk = clamp_t(u32, pxclk, 2, 255);
/* Disable the pixel clock, and set it to non-inverted and no delay */
clrbits32(&guts->clkdvdr,
CLKDVDR_PXCKEN | CLKDVDR_PXCKDLY | CLKDVDR_PXCLK_MASK);
/* Enable the clock and set the pxclk */
setbits32(&guts->clkdvdr, CLKDVDR_PXCKEN | (pxclk << 16));
iounmap(guts);
}
/** * p1022ds_valid_monitor_port: set the monitor port for sysfs
*/ staticenum fsl_diu_monitor_port
p1022ds_valid_monitor_port(enum fsl_diu_monitor_port port)
{ switch (port) { case FSL_DIU_PORT_DVI: case FSL_DIU_PORT_LVDS: return port; default: return FSL_DIU_PORT_DVI; /* Dual-link LVDS is not supported */
}
}
/* TRUE if there is a "video=fslfb" command-line parameter. */ staticbool fslfb;
/* * Search for a "video=fslfb" command-line parameter, and set 'fslfb' to * true if we find it. * * We need to use early_param() instead of __setup() because the normal * __setup() gets called to late. However, early_param() gets called very * early, before the device tree is unflattened, so all we can do now is set a * global variable. Later on, p1022_ds_setup_arch() will use that variable * to determine if we need to update the device tree.
*/ staticint __init early_video_setup(char *options)
{
fslfb = (strncmp(options, "fslfb:", 6) == 0);
/* * Disable the NOR and NAND flash nodes if there is video=fslfb... * command-line parameter. When the DIU is active, the localbus is * unavailable, so we have to disable these nodes before the MTD * driver loads.
*/ if (fslfb) { struct device_node *np =
of_find_compatible_node(NULL, NULL, "fsl,p1022-elbc");
/* * of_update_property() is called before * kmalloc() is available, so the 'new' object * should be allocated in the global area. * The easiest way is to do that is to * allocate one static local variable for each * call to this function.
*/
pr_info("p1022ds: disabling %pOF node",
np2);
of_update_property(np2, &nor_status);
of_node_put(np2);
}
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