/*
 * (C) Copyright 2002
 * Stäubli Faverges - <www.staubli.com>
 * Pierre AUBERT  p.aubert@staubli.com
 *
 * (C) Copyright 2005
 * Martin Krause TQ-Systems GmbH martin.krause@tqs.de
 *
 * SPDX-License-Identifier:     GPL-2.0+
 */

/*
 * Basic video support for SMI SM501 "Voyager" graphic controller
 */

#include <common.h>

#include <asm/io.h>
#include <video_fb.h>
#include <sm501.h>

#define read8(ptrReg)                \
    *(volatile unsigned char *)(sm501.isaBase + ptrReg)

#define write8(ptrReg,value) \
    *(volatile unsigned char *)(sm501.isaBase + ptrReg) = value

#define read16(ptrReg) \
    (*(volatile unsigned short *)(sm501.isaBase + ptrReg))

#define write16(ptrReg,value) \
    (*(volatile unsigned short *)(sm501.isaBase + ptrReg) = value)

#define read32(ptrReg) \
    (*(volatile unsigned int *)(sm501.isaBase + ptrReg))

#define write32(ptrReg, value) \
    (*(volatile unsigned int *)(sm501.isaBase + ptrReg) = value)

GraphicDevice sm501;

void write_be32(int off, unsigned int val)
{
        out_be32((unsigned __iomem *)(sm501.isaBase + off), val);
}

void write_le32(int off, unsigned int val)
{
        out_le32((unsigned __iomem *)(sm501.isaBase + off), val);
}

void (*write_reg32)(int off, unsigned int val) = write_be32;

/*-----------------------------------------------------------------------------
 * SmiSetRegs --
 *-----------------------------------------------------------------------------
 */
static void SmiSetRegs (void)
{
        /*
         * The content of the chipset register depends on the board (clocks,
         * ...)
         */
        const SMI_REGS *preg = board_get_regs ();
        while (preg->Index) {
                write_reg32 (preg->Index, preg->Value);
                /*
                 * Insert a delay between
                 */
                udelay (1000);
                preg ++;
        }
}

#ifdef CONFIG_VIDEO_SM501_PCI
static struct pci_device_id sm501_pci_tbl[] = {
        { PCI_VENDOR_ID_SMI, PCI_DEVICE_ID_SMI_501 },
        {}
};
#endif

/*
 * We do not enforce board code to provide empty/unused
 * functions for this driver and define weak default
 * functions here.
 */
unsigned int __board_video_init (void)
{
        return 0;
}

unsigned int board_video_init (void)
                        __attribute__((weak, alias("__board_video_init")));

unsigned int __board_video_get_fb (void)
{
        return 0;
}

unsigned int board_video_get_fb (void)
                        __attribute__((weak, alias("__board_video_get_fb")));

void __board_validate_screen (unsigned int base)
{
}

void board_validate_screen (unsigned int base)
                        __attribute__((weak, alias("__board_validate_screen")));

/*-----------------------------------------------------------------------------
 * video_hw_init --
 *-----------------------------------------------------------------------------
 */
void *video_hw_init (void)
{
#ifdef CONFIG_VIDEO_SM501_PCI
        unsigned int pci_mem_base, pci_mmio_base;
        unsigned int id;
        unsigned short device_id;
        pci_dev_t devbusfn;
        int mem;
#endif
        unsigned int *vm, i;

        memset (&sm501, 0, sizeof (GraphicDevice));

#ifdef CONFIG_VIDEO_SM501_PCI
        printf("Video: ");

        /* Look for SM501/SM502 chips */
        devbusfn = pci_find_devices(sm501_pci_tbl, 0);
        if (devbusfn < 0) {
                printf ("PCI Controller not found.\n");
                goto not_pci;
        }

        /* Setup */
        pci_write_config_dword (devbusfn, PCI_COMMAND,
                                (PCI_COMMAND_MEMORY | PCI_COMMAND_IO));
        pci_read_config_word (devbusfn, PCI_DEVICE_ID, &device_id);
        pci_read_config_dword (devbusfn, PCI_REVISION_ID, &id);
        pci_read_config_dword (devbusfn, PCI_BASE_ADDRESS_0, &pci_mem_base);
        pci_read_config_dword (devbusfn, PCI_BASE_ADDRESS_1, &pci_mmio_base);
        sm501.frameAdrs = pci_mem_to_phys (devbusfn, pci_mem_base);
        sm501.isaBase = pci_mem_to_phys (devbusfn, pci_mmio_base);

        if (sm501.isaBase)
                write_reg32 = write_le32;

        mem = in_le32 ((unsigned __iomem *)(sm501.isaBase + 0x10));
        mem = (mem & 0x0000e000) >> 13;
        switch (mem) {
        case 1:
                mem = 8;
                break;
        case 2:
                mem = 16;
                break;
        case 3:
                mem = 32;
                break;
        case 4:
                mem = 64;
                break;
        case 5:
                mem = 2;
                break;
        case 0:
        default:
                mem = 4;
        }
        printf ("PCI SM50%d %d MB\n", ((id & 0xff) == 0xC0) ? 2 : 1, mem);
not_pci:
#endif
        /*
         * Initialization of the access to the graphic chipset Retreive base
         * address of the chipset (see board/RPXClassic/eccx.c)
         */
        if (!sm501.isaBase) {
                sm501.isaBase = board_video_init ();
                if (!sm501.isaBase)
                        return NULL;
        }

        if (!sm501.frameAdrs) {
                sm501.frameAdrs = board_video_get_fb ();
                if (!sm501.frameAdrs)
                        return NULL;
        }

        sm501.winSizeX = board_get_width ();
        sm501.winSizeY = board_get_height ();

#if defined(CONFIG_VIDEO_SM501_8BPP)
        sm501.gdfIndex = GDF__8BIT_INDEX;
        sm501.gdfBytesPP = 1;

#elif defined(CONFIG_VIDEO_SM501_16BPP)
        sm501.gdfIndex = GDF_16BIT_565RGB;
        sm501.gdfBytesPP = 2;

#elif defined(CONFIG_VIDEO_SM501_32BPP)
        sm501.gdfIndex = GDF_32BIT_X888RGB;
        sm501.gdfBytesPP = 4;
#else
#error Unsupported SM501 BPP
#endif

        sm501.memSize = sm501.winSizeX * sm501.winSizeY * sm501.gdfBytesPP;

        /* Load Smi registers */
        SmiSetRegs ();

        /* (see board/RPXClassic/RPXClassic.c) */
        board_validate_screen (sm501.isaBase);

        /* Clear video memory */
        i = sm501.memSize/4;
        vm = (unsigned int *)sm501.frameAdrs;
        while(i--)
                *vm++ = 0;

        return (&sm501);
}