/*
 * 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.
 */

#include <linux/fsl/guts.h>
#include <linux/pci.h>
#include <linux/of_platform.h>
#include <asm/div64.h>
#include <asm/mpic.h>
#include <asm/swiotlb.h>

#include <sysdev/fsl_soc.h>
#include <sysdev/fsl_pci.h>
#include <asm/udbg.h>
#include <asm/fsl_lbc.h>
#include "smp.h"

#include "mpc85xx.h"

#if defined(CONFIG_FB_FSL_DIU) || defined(CONFIG_FB_FSL_DIU_MODULE)

#define PMUXCR_ELBCDIU_MASK     0xc0000000
#define PMUXCR_ELBCDIU_NOR16    0x80000000
#define PMUXCR_ELBCDIU_DIU      0x40000000

/*
 * 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

/* Some ngPIXIS register definitions */
#define PX_CTL          3
#define PX_BRDCFG0      8
#define PX_BRDCFG1      9

#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 PX_BRDCFG1_DDCEN        0x10

#define PX_CTL_ALTACC           0x80

/*
 * 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

#define MAKE_AD(alpha, red, blue, green, size, c0, c1, c2, c3) \
        cpu_to_le32(AD_BYTE_F | (alpha << AD_ALPHA_C_SHIFT) | \
        (blue << AD_BLUE_C_SHIFT) | (green << AD_GREEN_C_SHIFT) | \
        (red << AD_RED_C_SHIFT) | (c3 << AD_COMP_3_SHIFT) | \
        (c2 << AD_COMP_2_SHIFT) | (c1 << AD_COMP_1_SHIFT) | \
        (c0 << AD_COMP_0_SHIFT) | (size << AD_PIXEL_S_SHIFT))

struct fsl_law {
        u32     lawbar;
        u32     reserved1;
        u32     lawar;
        u32     reserved[5];
};

#define LAWBAR_MASK     0x00F00000
#define LAWBAR_SHIFT    12

#define LAWAR_EN        0x80000000
#define LAWAR_TGT_MASK  0x01F00000
#define LAW_TRGT_IF_LBC (0x04 << 20)

#define LAWAR_MASK      (LAWAR_EN | LAWAR_TGT_MASK)
#define LAWAR_MATCH     (LAWAR_EN | LAW_TRGT_IF_LBC)

#define BR_BA           0xFFFF8000

/*
 * 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(const void *ecm, unsigned int 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
        const struct fsl_law *law = ecm + 0xc08;
        unsigned int 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);
        }

        return 0;
#endif
}

/**
 * p1022ds_set_monitor_port: switch the output to a different monitor port
 */
static void p1022ds_set_monitor_port(enum fsl_diu_monitor_port port)
{
        struct device_node *guts_node;
        struct device_node *lbc_node = NULL;
        struct device_node *law_node = NULL;
        struct ccsr_guts __iomem *guts;
        struct fsl_lbc_regs *lbc = NULL;
        void *ecm = NULL;
        u8 __iomem *lbc_lcs0_ba = NULL;
        u8 __iomem *lbc_lcs1_ba = NULL;
        phys_addr_t cs0_addr, cs1_addr;
        u32 br0, or0, br1, or1;
        const __be32 *iprop;
        unsigned int num_laws;
        u8 b;

        /* Map the global utilities registers. */
        guts_node = of_find_compatible_node(NULL, NULL, "fsl,p1022-guts");
        if (!guts_node) {
                pr_err("p1022ds: missing global utilities device node\n");
                return;
        }

        guts = of_iomap(guts_node, 0);
        if (!guts) {
                pr_err("p1022ds: could not map global utilities device\n");
                goto exit;
        }

        lbc_node = of_find_compatible_node(NULL, NULL, "fsl,p1022-elbc");
        if (!lbc_node) {
                pr_err("p1022ds: missing localbus node\n");
                goto exit;
        }

        lbc = of_iomap(lbc_node, 0);
        if (!lbc) {
                pr_err("p1022ds: could not map localbus node\n");
                goto exit;
        }

        law_node = of_find_compatible_node(NULL, NULL, "fsl,ecm-law");
        if (!law_node) {
                pr_err("p1022ds: missing local access window node\n");
                goto exit;
        }

        ecm = of_iomap(law_node, 0);
        if (!ecm) {
                pr_err("p1022ds: could not map local access window node\n");
                goto exit;
        }

        iprop = of_get_property(law_node, "fsl,num-laws", NULL);
        if (!iprop) {
                pr_err("p1022ds: LAW node is missing fsl,num-laws property\n");
                goto exit;
        }
        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");
                goto exit;
        }

        /*
         * 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);
                goto exit;
        }
        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);
                goto exit;
        }

        lbc_lcs0_ba = ioremap(cs0_addr, 1);
        if (!lbc_lcs0_ba) {
                pr_err("p1022ds: could not ioremap CS0 address %llx\n",
                       (unsigned long long)cs0_addr);
                goto exit;
        }
        lbc_lcs1_ba = ioremap(cs1_addr, 1);
        if (!lbc_lcs1_ba) {
                pr_err("p1022ds: could not ioremap CS1 address %llx\n",
                       (unsigned long long)cs1_addr);
                goto exit;
        }

        /* 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;

                pixis_node =
                        of_find_compatible_node(NULL, NULL, "fsl,p1022ds-fpga");
                if (!pixis_node) {
                        pr_err("p1022ds: missing pixis node\n");
                        goto exit;
                }

                pixis = of_iomap(pixis_node, 0);
                of_node_put(pixis_node);
                if (!pixis) {
                        pr_err("p1022ds: could not map pixis registers\n");
                        goto exit;
                }

                /* Enable indirect PIXIS mode.  */
                setbits8(pixis + PX_CTL, PX_CTL_ALTACC);
                iounmap(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);

        of_node_put(law_node);
        of_node_put(lbc_node);
        of_node_put(guts_node);
}

/**
 * p1022ds_set_pixel_clock: program the DIU's clock
 *
 * @pixclock: the wavelength, in picoseconds, of the clock
 */
void p1022ds_set_pixel_clock(unsigned int pixclock)
{
        struct device_node *guts_np = NULL;
        struct ccsr_guts __iomem *guts;
        unsigned long 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
 */
enum 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 */
        }
}

#endif

void __init p1022_ds_pic_init(void)
{
        struct mpic *mpic = mpic_alloc(NULL, 0, MPIC_BIG_ENDIAN |
                MPIC_SINGLE_DEST_CPU,
                0, 256, " OpenPIC  ");
        BUG_ON(mpic == NULL);
        mpic_init(mpic);
}

#if defined(CONFIG_FB_FSL_DIU) || defined(CONFIG_FB_FSL_DIU_MODULE)

/* TRUE if there is a "video=fslfb" command-line parameter. */
static bool 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.
 */
static int __init early_video_setup(char *options)
{
        fslfb = (strncmp(options, "fslfb:", 6) == 0);

        return 0;
}
early_param("video", early_video_setup);

#endif

/*
 * Setup the architecture
 */
static void __init p1022_ds_setup_arch(void)
{
        if (ppc_md.progress)
                ppc_md.progress("p1022_ds_setup_arch()", 0);

#if defined(CONFIG_FB_FSL_DIU) || defined(CONFIG_FB_FSL_DIU_MODULE)
        diu_ops.set_monitor_port        = p1022ds_set_monitor_port;
        diu_ops.set_pixel_clock         = p1022ds_set_pixel_clock;
        diu_ops.valid_monitor_port      = p1022ds_valid_monitor_port;

        /*
         * 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");

                if (np) {
                        struct device_node *np2;

                        of_node_get(np);
                        np2 = of_find_compatible_node(np, NULL, "cfi-flash");
                        if (np2) {
                                static struct property nor_status = {
                                        .name = "status",
                                        .value = "disabled",
                                        .length = sizeof("disabled"),
                                };

                                /*
                                 * 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);
                        }

                        of_node_get(np);
                        np2 = of_find_compatible_node(np, NULL,
                                                      "fsl,elbc-fcm-nand");
                        if (np2) {
                                static struct property nand_status = {
                                        .name = "status",
                                        .value = "disabled",
                                        .length = sizeof("disabled"),
                                };

                                pr_info("p1022ds: disabling %pOF node",
                                        np2);
                                of_update_property(np2, &nand_status);
                                of_node_put(np2);
                        }

                        of_node_put(np);
                }

        }

#endif

        mpc85xx_smp_init();

        fsl_pci_assign_primary();

        swiotlb_detect_4g();

        pr_info("Freescale P1022 DS reference board\n");
}

machine_arch_initcall(p1022_ds, mpc85xx_common_publish_devices);

/*
 * Called very early, device-tree isn't unflattened
 */
static int __init p1022_ds_probe(void)
{
        return of_machine_is_compatible("fsl,p1022ds");
}

define_machine(p1022_ds) {
        .name                   = "P1022 DS",
        .probe                  = p1022_ds_probe,
        .setup_arch             = p1022_ds_setup_arch,
        .init_IRQ               = p1022_ds_pic_init,
#ifdef CONFIG_PCI
        .pcibios_fixup_bus      = fsl_pcibios_fixup_bus,
        .pcibios_fixup_phb      = fsl_pcibios_fixup_phb,
#endif
        .get_irq                = mpic_get_irq,
        .calibrate_decr         = generic_calibrate_decr,
        .progress               = udbg_progress,
};