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path: root/drivers/video/fbdev/pmagb-b-fb.c
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Diffstat (limited to 'drivers/video/fbdev/pmagb-b-fb.c')
-rw-r--r--drivers/video/fbdev/pmagb-b-fb.c408
1 files changed, 408 insertions, 0 deletions
diff --git a/drivers/video/fbdev/pmagb-b-fb.c b/drivers/video/fbdev/pmagb-b-fb.c
new file mode 100644
index 0000000000..6432492467
--- /dev/null
+++ b/drivers/video/fbdev/pmagb-b-fb.c
@@ -0,0 +1,408 @@
+/*
+ * 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 <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 const struct fb_var_screeninfo pmagbbfb_defined = {
+ .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 const struct fb_fix_screeninfo pmagbbfb_fix = {
+ .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;
+
+ if (regno >= info->cmap.len)
+ return 1;
+
+ 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 const struct fb_ops pmagbbfb_ops = {
+ .owner = THIS_MODULE,
+ FB_DEFAULT_IOMEM_OPS,
+ .fb_setcolreg = pmagbbfb_setcolreg,
+};
+
+
+/*
+ * Turn the hardware cursor off.
+ */
+static void 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 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 pmagbbfb_osc_setup(struct fb_info *info)
+{
+ static unsigned int pmagbbfb_freqs[] = {
+ 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 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)
+ 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_name(dev));
+ err = -ENOMEM;
+ goto err_alloc;
+ }
+
+ info->fbops = &pmagbbfb_ops;
+ info->fix = pmagbbfb_fix;
+ info->var = pmagbbfb_defined;
+
+ /* Request the I/O MEM resource. */
+ start = tdev->resource.start;
+ len = tdev->resource.end - start + 1;
+ if (!request_mem_region(start, len, dev_name(dev))) {
+ printk(KERN_ERR "%s: Cannot reserve FB region\n",
+ dev_name(dev));
+ err = -EBUSY;
+ goto err_cmap;
+ }
+
+ /* MMIO mapping setup. */
+ info->fix.mmio_start = start;
+ par->mmio = ioremap(info->fix.mmio_start, info->fix.mmio_len);
+ if (!par->mmio) {
+ printk(KERN_ERR "%s: Cannot map MMIO\n", dev_name(dev));
+ 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(info->fix.smem_start, info->fix.smem_len);
+ if (!par->smem) {
+ printk(KERN_ERR "%s: Cannot map FB\n", dev_name(dev));
+ 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_name(dev));
+ 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);
+
+ fb_info(info, "%s frame buffer device at %s\n",
+ info->fix.id, dev_name(dev));
+ fb_info(info, "Osc0: %s, Osc1: %s, Osc%u selected\n",
+ 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 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 = 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");