[PATCH] DEC PMAGB B framebuffer update
Revive HX frame buffer support for 2.6.
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/drivers/video/pmagb-b-fb.c b/drivers/video/pmagb-b-fb.c
index d14eaee..a483b13 100644
--- a/drivers/video/pmagb-b-fb.c
+++ b/drivers/video/pmagb-b-fb.c
@@ -1,114 +1,128 @@
/*
- * linux/drivers/video/pmagb-b-fb.c
+ * linux/drivers/video/pmagb-b-fb.c
*
- * PMAGB-B TurboChannel framebuffer card support ... derived from:
+ * 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.
+ * 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
+ * DECstation related code Copyright (C) 1999, 2000, 2001 by
+ * Michael Engel <engel@unix-ag.org>,
+ * Karsten Merker <merker@linuxtag.org> and
* Harald Koerfgen.
- * 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.
+ * Copyright (c) 2005 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.
*/
-/*
- * We currently only support the PMAGB-B in high resolution mode
- * as I know of no way to detect low resolution mode set via jumper.
- * KM, 2001/01/07
- */
-
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/sched.h>
-#include <linux/errno.h>
-#include <linux/string.h>
-#include <linux/timer.h>
-#include <linux/mm.h>
-#include <linux/tty.h>
-#include <linux/slab.h>
+#include <linux/compiler.h>
#include <linux/delay.h>
-#include <linux/init.h>
+#include <linux/errno.h>
#include <linux/fb.h>
-#include <asm/bootinfo.h>
-#include <asm/dec/machtype.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/types.h>
+
+#include <asm/bug.h>
+#include <asm/io.h>
+#include <asm/system.h>
+
#include <asm/dec/tc.h>
+
#include <video/pmagb-b-fb.h>
-struct pmagb_b_ramdac_regs {
- unsigned char addr_low;
- unsigned char pad0[3];
- unsigned char addr_hi;
- unsigned char pad1[3];
- unsigned char data;
- unsigned char pad2[3];
- unsigned char cmap;
+
+struct pmagbbfb_par {
+ struct fb_info *next;
+ volatile void __iomem *mmio;
+ volatile void __iomem *smem;
+ volatile u32 __iomem *sfb;
+ volatile u32 __iomem *dac;
+ unsigned int osc0;
+ unsigned int osc1;
+ int slot;
};
-/*
- * Max 3 TURBOchannel slots -> max 3 PMAGB-B :)
- */
-static struct fb_info pmagbb_fb_info[3];
-static struct fb_var_screeninfo pmagbbfb_defined = {
- .xres = 1280,
- .yres = 1024,
- .xres_virtual = 1280,
- .yres_virtual = 1024,
+static struct fb_info *root_pmagbbfb_dev;
+
+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 = 274,
- .width = 195,
+ .height = -1,
+ .width = -1,
.accel_flags = FB_ACCEL_NONE,
+ .sync = FB_SYNC_ON_GREEN,
.vmode = FB_VMODE_NONINTERLACED,
};
-static struct fb_fix_screeninfo pmagbafb_fix = {
+static struct fb_fix_screeninfo pmagbbfb_fix __initdata = {
.id = "PMAGB-BA",
- .smem_len = (1280 * 1024),
+ .smem_len = (2048 * 1024),
.type = FB_TYPE_PACKED_PIXELS,
.visual = FB_VISUAL_PSEUDOCOLOR,
- .line_length = 1280,
+ .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);
}
-/*
- * Turn hardware cursor off
- */
-void pmagbbfb_erase_cursor(struct pmagb_b_ramdac_regs *bt459_regs)
+static inline u32 sfb_read(struct pmagbbfb_par *par, unsigned int reg)
{
- bt459_regs->addr_low = 0;
- bt459_regs->addr_hi = 3;
- bt459_regs->data = 0;
+ return readl(par->sfb + reg / 4);
}
-/*
- * Set the palette.
- */
-static int pmagbbfb_setcolreg(unsigned regno, unsigned red, unsigned green,
- unsigned blue, unsigned transp,
- struct fb_info *info)
+static inline void dac_write(struct pmagbbfb_par *par, unsigned int reg, u8 v)
{
- struct pmagb_b_ramdac_regs *bt459_regs = (struct pmagb_b_ramdac_regs *) info->par;
-
- if (regno >= info->cmap.len)
- return 1;
+ 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 harware colormap */
+ green >>= 8; /* wide, but the hardware colormap */
blue >>= 8; /* registers are only 8 bits wide */
- bt459_regs->addr_low = (__u8) regno;
- bt459_regs->addr_hi = 0;
- bt459_regs->cmap = red;
- bt459_regs->cmap = green;
- bt459_regs->cmap = blue;
+ 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;
}
@@ -121,62 +135,247 @@
.fb_cursor = soft_cursor,
};
-int __init pmagbbfb_init_one(int slot)
+
+/*
+ * Turn the hardware cursor off.
+ */
+static void __init pmagbbfb_erase_cursor(struct fb_info *info)
{
- unsigned long base_addr = get_tc_base_addr(slot);
- struct fb_info *info = &pmagbb_fb_info[slot];
+ struct pmagbbfb_par *par = info->par;
- printk("PMAGB-BA framebuffer in slot %d\n", slot);
- /*
- * Framebuffer display memory base address and friends
- */
- pmagbbfb_fix.smem_start = base_addr + PMAGB_B_ONBOARD_FBMEM_OFFSET;
- info->par = (base_addr + PMAGB_B_BT459_OFFSET);
-
- /*
- * Configure the Bt459 RAM DAC
- */
- pmagbbfb_erase_cursor((struct pmagb_b_ramdac_regs *) info->par);
+ mb();
+ dac_write(par, BT459_ADDR_LO, 0x00);
+ dac_write(par, BT459_ADDR_HI, 0x03);
+ wmb();
+ dac_write(par, BT459_DATA, 0x00);
+}
- /*
- * Let there be consoles..
- */
+/*
+ * 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, 74367, 72800,
+ 69197, 66000, 65000, 50350, 36000, 32000, 25175
+ };
+ struct pmagbbfb_par *par = info->par;
+ u32 count0 = 8, count1 = 8, counttc = 16 * 256 + 8;
+ u32 freq0, freq1, freqtc = get_tc_speed() / 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 < sizeof(pmagbbfb_freqs) / sizeof(*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_init_one(int slot)
+{
+ char freq0[12], freq1[12];
+ struct fb_info *info;
+ struct pmagbbfb_par *par;
+ unsigned long base_addr;
+ u32 vid_base;
+
+ info = framebuffer_alloc(sizeof(struct pmagbbfb_par), NULL);
+ if (!info)
+ return -ENOMEM;
+
+ par = info->par;
+ par->slot = slot;
+ claim_tc_card(par->slot);
+
+ base_addr = get_tc_base_addr(par->slot);
+
+ par->next = root_pmagbbfb_dev;
+ root_pmagbbfb_dev = info;
+
+ if (fb_alloc_cmap(&info->cmap, 256, 0) < 0)
+ goto err_alloc;
+
info->fbops = &pmagbbfb_ops;
- info->var = pmagbbfb_defined;
info->fix = pmagbbfb_fix;
- info->screen_base = pmagbbfb_fix.smem_start;
+ info->var = pmagbbfb_defined;
info->flags = FBINFO_DEFAULT;
- fb_alloc_cmap(&fb_info.cmap, 256, 0);
+ /* MMIO mapping setup. */
+ info->fix.mmio_start = base_addr;
+ par->mmio = ioremap_nocache(info->fix.mmio_start, info->fix.mmio_len);
+ if (!par->mmio)
+ goto err_cmap;
+ par->sfb = par->mmio + PMAGB_B_SFB;
+ par->dac = par->mmio + PMAGB_B_BT459;
+
+ /* Frame buffer mapping setup. */
+ info->fix.smem_start = base_addr + PMAGB_B_FBMEM;
+ par->smem = ioremap_nocache(info->fix.smem_start, info->fix.smem_len);
+ if (!par->smem)
+ 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);
if (register_framebuffer(info) < 0)
- return 1;
+ goto err_smem_map;
+
+ 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 in slot %d\n",
+ info->node, info->fix.id, par->slot);
+ 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_cmap:
+ fb_dealloc_cmap(&info->cmap);
+
+err_alloc:
+ root_pmagbbfb_dev = par->next;
+ release_tc_card(par->slot);
+ framebuffer_release(info);
+ return -ENXIO;
}
-/*
- * Initialise the framebuffer
- */
-
-int __init pmagbbfb_init(void)
+static void __exit pmagbbfb_exit_one(void)
{
- int sid;
- int found = 0;
+ struct fb_info *info = root_pmagbbfb_dev;
+ struct pmagbbfb_par *par = info->par;
+
+ unregister_framebuffer(info);
+ iounmap(par->smem);
+ iounmap(par->mmio);
+ fb_dealloc_cmap(&info->cmap);
+ root_pmagbbfb_dev = par->next;
+ release_tc_card(par->slot);
+ framebuffer_release(info);
+}
+
+
+/*
+ * Initialise the framebuffer.
+ */
+static int __init pmagbbfb_init(void)
+{
+ int count = 0;
+ int slot;
if (fb_get_options("pmagbbfb", NULL))
- return -ENODEV;
+ return -ENXIO;
- if (TURBOCHANNEL) {
- while ((sid = search_tc_card("PMAGB-BA")) >= 0) {
- found = 1;
- claim_tc_card(sid);
- pmagbbfb_init_one(sid);
- }
- return found ? 0 : -ENODEV;
- } else {
- return -ENODEV;
+ while ((slot = search_tc_card("PMAGB-BA")) >= 0) {
+ if (pmagbbfb_init_one(slot) < 0)
+ break;
+ count++;
}
+ return (count > 0) ? 0 : -ENXIO;
}
+static void __exit pmagbbfb_exit(void)
+{
+ while (root_pmagbbfb_dev)
+ pmagbbfb_exit_one();
+}
+
+
module_init(pmagbbfb_init);
+module_exit(pmagbbfb_exit);
+
MODULE_LICENSE("GPL");