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/*

 *      linux/drivers/video/pmagb-b-fb.c

 *

 *      PMAGB-B TURBOchannel Smart Frame Buffer (SFB) card support,

 *      derived from:

 *      "HP300 Topcat framebuffer support (derived from macfb of all things)

 *      Phil Blundell <philb@gnu.org> 1998", the original code can be

 *      found in the file hpfb.c in the same directory.

 *

 *      DECstation related code Copyright (C) 1999, 2000, 2001 by

 *      Michael Engel <engel@unix-ag.org>,

 *      Karsten Merker <merker@linuxtag.org> and

 *      Harald Koerfgen.

 *      Copyright (c) 2005, 2006  Maciej W. Rozycki

 *

 *      This file is subject to the terms and conditions of the GNU General

 *      Public License.  See the file COPYING in the main directory of this

 *      archive for more details.

 */

#include <linux/compiler.h>

#include <linux/delay.h>

#include <linux/errno.h>

#include <linux/fb.h>

#include <linux/init.h>

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/tc.h>

#include <linux/types.h>

#include <asm/io.h>

#include <asm/system.h>

#include <video/pmagb-b-fb.h>

struct pmagbbfb_par {

        volatile void __iomem *mmio;

        volatile void __iomem *smem;

        volatile u32 __iomem *sfb;

        volatile u32 __iomem *dac;

        unsigned int osc0;

        unsigned int osc1;

        int slot;

};

static struct fb_var_screeninfo pmagbbfb_defined __initdata = {

        .bits_per_pixel = 8,

        .red.length     = 8,

        .green.length   = 8,

        .blue.length    = 8,

        .activate       = FB_ACTIVATE_NOW,

        .height         = -1,

        .width          = -1,

        .accel_flags    = FB_ACCEL_NONE,

        .sync           = FB_SYNC_ON_GREEN,

        .vmode          = FB_VMODE_NONINTERLACED,

};

static struct fb_fix_screeninfo pmagbbfb_fix __initdata = {

        .id             = "PMAGB-BA",

        .smem_len       = (2048 * 1024),

        .type           = FB_TYPE_PACKED_PIXELS,

        .visual         = FB_VISUAL_PSEUDOCOLOR,

        .mmio_len       = PMAGB_B_FBMEM,

};

static inline void sfb_write(struct pmagbbfb_par *par, unsigned int reg, u32 v)

{

        writel(v, par->sfb + reg / 4);

}

static inline u32 sfb_read(struct pmagbbfb_par *par, unsigned int reg)

{

        return readl(par->sfb + reg / 4);

}

static inline void dac_write(struct pmagbbfb_par *par, unsigned int reg, u8 v)

{

        writeb(v, par->dac + reg / 4);

}

static inline u8 dac_read(struct pmagbbfb_par *par, unsigned int reg)

{

        return readb(par->dac + reg / 4);

}

static inline void gp0_write(struct pmagbbfb_par *par, u32 v)

{

        writel(v, par->mmio + PMAGB_B_GP0);

}

/*

 * Set the palette.

 */

static int pmagbbfb_setcolreg(unsigned int regno, unsigned int red,

                              unsigned int green, unsigned int blue,

                              unsigned int transp, struct fb_info *info)

{

        struct pmagbbfb_par *par = info->par;

        BUG_ON(regno >= info->cmap.len);

        red   >>= 8;    /* The cmap fields are 16 bits    */

        green >>= 8;    /* wide, but the hardware colormap */

        blue  >>= 8;    /* registers are only 8 bits wide */

        mb();

        dac_write(par, BT459_ADDR_LO, regno);

        dac_write(par, BT459_ADDR_HI, 0x00);

        wmb();

        dac_write(par, BT459_CMAP, red);

        wmb();

        dac_write(par, BT459_CMAP, green);

        wmb();

        dac_write(par, BT459_CMAP, blue);

        return 0;

}

static struct fb_ops pmagbbfb_ops = {

        .owner          = THIS_MODULE,

        .fb_setcolreg   = pmagbbfb_setcolreg,

        .fb_fillrect    = cfb_fillrect,

        .fb_copyarea    = cfb_copyarea,

        .fb_imageblit   = cfb_imageblit,

};

/*

 * Turn the hardware cursor off.

 */

static void __init pmagbbfb_erase_cursor(struct fb_info *info)

{

        struct pmagbbfb_par *par = info->par;

        mb();

        dac_write(par, BT459_ADDR_LO, 0x00);

        dac_write(par, BT459_ADDR_HI, 0x03);

        wmb();

        dac_write(par, BT459_DATA, 0x00);

}

/*

 * Set up screen parameters.

 */

static void __init pmagbbfb_screen_setup(struct fb_info *info)

{

        struct pmagbbfb_par *par = info->par;

        info->var.xres = ((sfb_read(par, SFB_REG_VID_HOR) >>

                           SFB_VID_HOR_PIX_SHIFT) & SFB_VID_HOR_PIX_MASK) * 4;

        info->var.xres_virtual = info->var.xres;

        info->var.yres = (sfb_read(par, SFB_REG_VID_VER) >>

                          SFB_VID_VER_SL_SHIFT) & SFB_VID_VER_SL_MASK;

        info->var.yres_virtual = info->var.yres;

        info->var.left_margin = ((sfb_read(par, SFB_REG_VID_HOR) >>

                                  SFB_VID_HOR_BP_SHIFT) &

                                 SFB_VID_HOR_BP_MASK) * 4;

        info->var.right_margin = ((sfb_read(par, SFB_REG_VID_HOR) >>

                                   SFB_VID_HOR_FP_SHIFT) &

                                  SFB_VID_HOR_FP_MASK) * 4;

        info->var.upper_margin = (sfb_read(par, SFB_REG_VID_VER) >>

                                  SFB_VID_VER_BP_SHIFT) & SFB_VID_VER_BP_MASK;

        info->var.lower_margin = (sfb_read(par, SFB_REG_VID_VER) >>

                                  SFB_VID_VER_FP_SHIFT) & SFB_VID_VER_FP_MASK;

        info->var.hsync_len = ((sfb_read(par, SFB_REG_VID_HOR) >>

                                SFB_VID_HOR_SYN_SHIFT) &

                               SFB_VID_HOR_SYN_MASK) * 4;

        info->var.vsync_len = (sfb_read(par, SFB_REG_VID_VER) >>

                               SFB_VID_VER_SYN_SHIFT) & SFB_VID_VER_SYN_MASK;

        info->fix.line_length = info->var.xres;

};

/*

 * Determine oscillator configuration.

 */

static void __init pmagbbfb_osc_setup(struct fb_info *info)

{

        static unsigned int pmagbbfb_freqs[] __initdata = {

                130808, 119843, 104000, 92980, 74370, 72800,

                69197, 66000, 65000, 50350, 36000, 32000, 25175

        };

        struct pmagbbfb_par *par = info->par;

        struct tc_bus *tbus = to_tc_dev(info->device)->bus;

        u32 count0 = 8, count1 = 8, counttc = 16 * 256 + 8;

        u32 freq0, freq1, freqtc = tc_get_speed(tbus) / 250;

        int i, j;

        gp0_write(par, 0);                               /* select Osc0 */

        for (j = 0; j < 16; j++) {

                mb();

                sfb_write(par, SFB_REG_TCCLK_COUNT, 0);

                mb();

                for (i = 0; i < 100; i++) {      /* nominally max. 20.5us */

                        if (sfb_read(par, SFB_REG_TCCLK_COUNT) == 0)

                                break;

                        udelay(1);

                }

                count0 += sfb_read(par, SFB_REG_VIDCLK_COUNT);

        }

        gp0_write(par, 1);                              /* select Osc1 */

        for (j = 0; j < 16; j++) {

                mb();

                sfb_write(par, SFB_REG_TCCLK_COUNT, 0);

                for (i = 0; i < 100; i++) {      /* nominally max. 20.5us */

                        if (sfb_read(par, SFB_REG_TCCLK_COUNT) == 0)

                                break;

                        udelay(1);

                }

                count1 += sfb_read(par, SFB_REG_VIDCLK_COUNT);

        }

        freq0 = (freqtc * count0 + counttc / 2) / counttc;

        par->osc0 = freq0;

        if (freq0 >= pmagbbfb_freqs[0] - (pmagbbfb_freqs[0] + 32) / 64 &&

            freq0 <= pmagbbfb_freqs[0] + (pmagbbfb_freqs[0] + 32) / 64)

                par->osc0 = pmagbbfb_freqs[0];

        freq1 = (par->osc0 * count1 + count0 / 2) / count0;

        par->osc1 = freq1;

        for (i = 0; i < ARRAY_SIZE(pmagbbfb_freqs); i++)

                if (freq1 >= pmagbbfb_freqs[i] -

                             (pmagbbfb_freqs[i] + 128) / 256 &&

                    freq1 <= pmagbbfb_freqs[i] +

                             (pmagbbfb_freqs[i] + 128) / 256) {

                        par->osc1 = pmagbbfb_freqs[i];

                        break;

                }

        if (par->osc0 - par->osc1 <= (par->osc0 + par->osc1 + 256) / 512 ||

            par->osc1 - par->osc0 <= (par->osc0 + par->osc1 + 256) / 512)

                par->osc1 = 0;

        gp0_write(par, par->osc1 != 0);                  /* reselect OscX */

        info->var.pixclock = par->osc1 ?

                             (1000000000 + par->osc1 / 2) / par->osc1 :

                             (1000000000 + par->osc0 / 2) / par->osc0;

};

static int __init pmagbbfb_probe(struct device *dev)

{

        struct tc_dev *tdev = to_tc_dev(dev);

        resource_size_t start, len;

        struct fb_info *info;

        struct pmagbbfb_par *par;

        char freq0[12], freq1[12];

        u32 vid_base;

        int err;

        info = framebuffer_alloc(sizeof(struct pmagbbfb_par), dev);

        if (!info) {

                printk(KERN_ERR "%s: Cannot allocate memory\n", dev->bus_id);

                return -ENOMEM;

        }

        par = info->par;

        dev_set_drvdata(dev, info);

        if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {

                printk(KERN_ERR "%s: Cannot allocate color map\n",

                       dev->bus_id);

                err = -ENOMEM;

                goto err_alloc;

        }

        info->fbops = &pmagbbfb_ops;

        info->fix = pmagbbfb_fix;

        info->var = pmagbbfb_defined;

        info->flags = FBINFO_DEFAULT;

        /* Request the I/O MEM resource.  */

        start = tdev->resource.start;

        len = tdev->resource.end - start + 1;

        if (!request_mem_region(start, len, dev->bus_id)) {

                printk(KERN_ERR "%s: Cannot reserve FB region\n", dev->bus_id);

                err = -EBUSY;

                goto err_cmap;

        }

        /* MMIO mapping setup.  */

        info->fix.mmio_start = start;

        par->mmio = ioremap_nocache(info->fix.mmio_start, info->fix.mmio_len);

        if (!par->mmio) {

                printk(KERN_ERR "%s: Cannot map MMIO\n", dev->bus_id);

                err = -ENOMEM;

                goto err_resource;

        }

        par->sfb = par->mmio + PMAGB_B_SFB;

        par->dac = par->mmio + PMAGB_B_BT459;

        /* Frame buffer mapping setup.  */

        info->fix.smem_start = start + PMAGB_B_FBMEM;

        par->smem = ioremap_nocache(info->fix.smem_start, info->fix.smem_len);

        if (!par->smem) {

                printk(KERN_ERR "%s: Cannot map FB\n", dev->bus_id);

                err = -ENOMEM;

                goto err_mmio_map;

        }

        vid_base = sfb_read(par, SFB_REG_VID_BASE);

        info->screen_base = (void __iomem *)par->smem + vid_base * 0x1000;

        info->screen_size = info->fix.smem_len - 2 * vid_base * 0x1000;

        pmagbbfb_erase_cursor(info);

        pmagbbfb_screen_setup(info);

        pmagbbfb_osc_setup(info);

        err = register_framebuffer(info);

        if (err < 0) {

                printk(KERN_ERR "%s: Cannot register framebuffer\n",

                       dev->bus_id);

                goto err_smem_map;

        }

        get_device(dev);

        snprintf(freq0, sizeof(freq0), "%u.%03uMHz",

                 par->osc0 / 1000, par->osc0 % 1000);

        snprintf(freq1, sizeof(freq1), "%u.%03uMHz",

                 par->osc1 / 1000, par->osc1 % 1000);

        pr_info("fb%d: %s frame buffer device at %s\n",

                info->node, info->fix.id, dev->bus_id);

        pr_info("fb%d: Osc0: %s, Osc1: %s, Osc%u selected\n",

                info->node, freq0, par->osc1 ? freq1 : "disabled",

                par->osc1 != 0);

        return 0;

err_smem_map:

        iounmap(par->smem);

err_mmio_map:

        iounmap(par->mmio);

err_resource:

        release_mem_region(start, len);

err_cmap:

        fb_dealloc_cmap(&info->cmap);

err_alloc:

        framebuffer_release(info);

        return err;

}

static int __exit pmagbbfb_remove(struct device *dev)

{

        struct tc_dev *tdev = to_tc_dev(dev);

        struct fb_info *info = dev_get_drvdata(dev);

        struct pmagbbfb_par *par = info->par;

        resource_size_t start, len;

        put_device(dev);

        unregister_framebuffer(info);

        iounmap(par->smem);

        iounmap(par->mmio);

        start = tdev->resource.start;

        len = tdev->resource.end - start + 1;

        release_mem_region(start, len);

        fb_dealloc_cmap(&info->cmap);

        framebuffer_release(info);

        return 0;

}

/*

 * Initialize the framebuffer.

 */

static const struct tc_device_id pmagbbfb_tc_table[] = {

        { "DEC     ", "PMAGB-BA" },

        { }

};

MODULE_DEVICE_TABLE(tc, pmagbbfb_tc_table);

static struct tc_driver pmagbbfb_driver = {

        .id_table       = pmagbbfb_tc_table,

        .driver         = {

                .name   = "pmagbbfb",

                .bus    = &tc_bus_type,

                .probe  = pmagbbfb_probe,

                .remove = __exit_p(pmagbbfb_remove),

        },

};

static int __init pmagbbfb_init(void)

{

#ifndef MODULE

        if (fb_get_options("pmagbbfb", NULL))

                return -ENXIO;

#endif

        return tc_register_driver(&pmagbbfb_driver);

}

static void __exit pmagbbfb_exit(void)

{

        tc_unregister_driver(&pmagbbfb_driver);

}

module_init(pmagbbfb_init);

module_exit(pmagbbfb_exit);

MODULE_LICENSE("GPL");