[PATCH] DEC PMAG BA frame buffer update

Rewrite PMAG BA frame buffer driver for 2.6.

Acked-by: Antonino Daplas <adaplas@pol.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

2 files changed, 205 insertions, 121 deletions

diff --git a/drivers/video/pmag-ba-fb.c b/drivers/video/pmag-ba-fb.c
index f8095588e99d..c98f1c8d7dc2 100644
--- a/drivers/video/pmag-ba-fb.c
+++ b/drivers/video/pmag-ba-fb.c
@@ -1,57 +1,55 @@
 /*
- *      linux/drivers/video/pmag-ba-fb.c
+ *      linux/drivers/video/pmag-ba-fb.c
  *
- *      PMAG-BA TurboChannel framebuffer card support ... derived from:
+ *      PMAG-BA TURBOchannel Color Frame Buffer (CFB) 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.
  *
  *      Based on digital document:
  *      "PMAG-BA TURBOchannel Color Frame Buffer
  *       Functional Specification", Revision 1.2, August 27, 1990
  *
- *      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.
  */
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/sched.h>
+
+#include <linux/compiler.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/delay.h>
-#include <linux/init.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/pmag-ba-fb.h>
 
-struct pmag_ba_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 pmagbafb_par {
+        struct fb_info *next;
+        volatile void __iomem *mmio;
+        volatile u32 __iomem *dac;
+        int slot;
 };
 
-/*
- * Max 3 TURBOchannel slots -> max 3 PMAG-BA :)
- */
-static struct fb_info pmagba_fb_info[3];
 
-static struct fb_var_screeninfo pmagbafb_defined = {
+static struct fb_info *root_pmagbafb_dev;
+
+static struct fb_var_screeninfo pmagbafb_defined __initdata = {
         .xres           = 1024,
         .yres           = 864,
         .xres_virtual   = 1024,
@@ -61,58 +59,71 @@ static struct fb_var_screeninfo pmagbafb_defined = {
         .green.length   = 8,
         .blue.length    = 8,
         .activate       = FB_ACTIVATE_NOW,
-        .height         = 274,
-        .width          = 195,
-        .accel          = FB_ACCEL_NONE,
+        .height         = -1,
+        .width          = -1,
+        .accel_flags    = FB_ACCEL_NONE,
+        .pixclock       = 14452,
+        .left_margin    = 116,
+        .right_margin   = 12,
+        .upper_margin   = 34,
+        .lower_margin   = 12,
+        .hsync_len      = 128,
+        .vsync_len      = 3,
+        .sync           = FB_SYNC_ON_GREEN,
         .vmode          = FB_VMODE_NONINTERLACED,
 };
 
-static struct fb_fix_screeninfo pmagbafb_fix = {
+static struct fb_fix_screeninfo pmagbafb_fix __initdata = {
         .id             = "PMAG-BA",
-        .smem_len       = (1024 * 864),
+        .smem_len       = (1024 * 1024),
         .type           = FB_TYPE_PACKED_PIXELS,
         .visual         = FB_VISUAL_PSEUDOCOLOR,
         .line_length    = 1024,
+        .mmio_len       = PMAG_BA_SIZE - PMAG_BA_BT459,
 };
 
-/*
- * Turn hardware cursor off
- */
-void pmagbafb_erase_cursor(struct pmag_ba_ramdac_regs *bt459_regs)
+
+static inline void dac_write(struct pmagbafb_par *par, unsigned int reg, u8 v)
 {
-        bt459_regs->addr_low = 0;
-        bt459_regs->addr_hi = 3;
-        bt459_regs->data = 0;
+        writeb(v, par->dac + reg / 4);
 }
 
+static inline u8 dac_read(struct pmagbafb_par *par, unsigned int reg)
+{
+        return readb(par->dac + reg / 4);
+}
+
+
 /*
- * Set the palette. 
+ * Set the palette.
  */
-static int pmagbafb_setcolreg(unsigned regno, unsigned red, unsigned green,
-                              unsigned blue, unsigned transp,
-                              struct fb_info *info)
+static int pmagbafb_setcolreg(unsigned int regno, unsigned int red,
+                              unsigned int green, unsigned int blue,
+                              unsigned int transp, struct fb_info *info)
 {
-        struct pmag_ba_ramdac_regs *bt459_regs = (struct pmag_ba_ramdac_regs *) info->par;
+        struct pmagbafb_par *par = info->par;
 
-        if (regno >= info->cmap.len)
-                return 1;
+        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;
 }
 
 static struct fb_ops pmagbafb_ops = {
         .owner          = THIS_MODULE,
-        .fb_get_fix     = gen_get_fix,
-        .fb_get_var     = gen_get_var,
         .fb_setcolreg   = pmagbafb_setcolreg,
         .fb_fillrect    = cfb_fillrect,
         .fb_copyarea    = cfb_copyarea,
@@ -120,63 +131,133 @@ static struct fb_ops pmagbafb_ops = {
         .fb_cursor      = soft_cursor,
 };
 
-int __init pmagbafb_init_one(int slot)
+
+/*
+ * Turn the hardware cursor off.
+ */
+static void __init pmagbafb_erase_cursor(struct fb_info *info)
+{
+        struct pmagbafb_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);
+}
+
+
+static int __init pmagbafb_init_one(int slot)
 {
-        unsigned long base_addr = get_tc_base_addr(slot);
-        struct fb_info *info = &pmagba_fb_info[slot]; 
-        struct display *disp = &pmagba_disp[slot];
-
-        printk("PMAG-BA framebuffer in slot %d\n", slot);
-        /*
-         * Framebuffer display memory base address and friends
-         */
-        pmagbafb_fix.smem_start = base_addr + PMAG_BA_ONBOARD_FBMEM_OFFSET;
-        info->par = (base_addr + PMAG_BA_BT459_OFFSET);
-
-        /*
-         * Configure the Bt459 RAM DAC
-         */
-        pmagbafb_erase_cursor((struct pmag_ba_ramdac_regs *) info->par);
-
-        /*
-         *      Let there be consoles..
-         */
+        struct fb_info *info;
+        struct pmagbafb_par *par;
+        unsigned long base_addr;
+
+        info = framebuffer_alloc(sizeof(struct pmagbafb_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_pmagbafb_dev;
+        root_pmagbafb_dev = info;
+
+        if (fb_alloc_cmap(&info->cmap, 256, 0) < 0)
+                goto err_alloc;
+
         info->fbops = &pmagbafb_ops;
+        info->fix = pmagbafb_fix;
         info->var = pmagbafb_defined;
-        info->fix = pmagbafb_fix; 
-        info->screen_base = pmagbafb_fix.smem_start;
         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->dac = par->mmio + PMAG_BA_BT459;
+
+        /* Frame buffer mapping setup.  */
+        info->fix.smem_start = base_addr + PMAG_BA_FBMEM;
+        info->screen_base = ioremap_nocache(info->fix.smem_start,
+                                            info->fix.smem_len);
+        if (!info->screen_base)
+                goto err_mmio_map;
+        info->screen_size = info->fix.smem_len;
+
+        pmagbafb_erase_cursor(info);
 
         if (register_framebuffer(info) < 0)
-                return 1;
+                goto err_smem_map;
+
+        pr_info("fb%d: %s frame buffer device in slot %d\n",
+                info->node, info->fix.id, par->slot);
+
         return 0;
+
+
+err_smem_map:
+        iounmap(info->screen_base);
+
+err_mmio_map:
+        iounmap(par->mmio);
+
+err_cmap:
+        fb_dealloc_cmap(&info->cmap);
+
+err_alloc:
+        root_pmagbafb_dev = par->next;
+        release_tc_card(par->slot);
+        framebuffer_release(info);
+        return -ENXIO;
 }
 
-/* 
- * Initialise the framebuffer
- */
+static void __exit pmagbafb_exit_one(void)
+{
+        struct fb_info *info = root_pmagbafb_dev;
+        struct pmagbafb_par *par = info->par;
 
-int __init pmagbafb_init(void)
+        unregister_framebuffer(info);
+        iounmap(info->screen_base);
+        iounmap(par->mmio);
+        fb_dealloc_cmap(&info->cmap);
+        root_pmagbafb_dev = par->next;
+        release_tc_card(par->slot);
+        framebuffer_release(info);
+}
+
+
+/*
+ * Initialise the framebuffer.
+ */
+static int __init pmagbafb_init(void)
 {
-        int sid;
-        int found = 0;
+        int count = 0;
+        int slot;
 
         if (fb_get_options("pmagbafb", NULL))
-                return -ENODEV;
-
-        if (TURBOCHANNEL) {
-                while ((sid = search_tc_card("PMAG-BA")) >= 0) {
-                        found = 1;
-                        claim_tc_card(sid);
-                        pmagbafb_init_one(sid);
-                }
-                return found ? 0 : -ENODEV;
-        } else {
-                return -ENODEV;
+                return -ENXIO;
+
+        while ((slot = search_tc_card("PMAG-BA")) >= 0) {
+                if (pmagbafb_init_one(slot) < 0)
+                        break;
+                count++;
         }
+        return (count > 0) ? 0 : -ENXIO;
 }
 
+static void __exit pmagbafb_exit(void)
+{
+        while (root_pmagbafb_dev)
+                pmagbafb_exit_one();
+}
+
+
 module_init(pmagbafb_init);
+module_exit(pmagbafb_exit);
+
 MODULE_LICENSE("GPL");
diff --git a/include/video/pmag-ba-fb.h b/include/video/pmag-ba-fb.h
index cebef073b9a3..fceb6c0f6583 100644
--- a/include/video/pmag-ba-fb.h
+++ b/include/video/pmag-ba-fb.h
@@ -1,24 +1,27 @@
 /*
- *      linux/drivers/video/pmag-ba-fb.h
+ *      linux/include/video/pmag-ba-fb.h
  *
- *      TurboChannel PMAG-BA framebuffer card support,
- *      Copyright (C) 1999,2000,2001 by
- *      Michael Engel <engel@unix-ag.org>,
- *      Karsten Merker <merker@linuxtag.org>
- *      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.
- */
-
-/*
- * Bt459 RAM DAC register base offset (rel. to TC slot base address)
+ *      TURBOchannel PMAG-BA Color Frame Buffer (CFB) card support,
+ *      Copyright (C) 1999, 2000, 2001 by
+ *      Michael Engel <engel@unix-ag.org>,
+ *      Karsten Merker <merker@linuxtag.org>
+ *      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.
  */
 
-#define PMAG_BA_BT459_OFFSET                    0x00200000
-
-/*
- * Begin of PMAG-BA framebuffer memory relative to TC slot address,
- * resolution is 1024x864x8
- */
+/* IOmem resource offsets.  */
+#define PMAG_BA_FBMEM           0x000000        /* frame buffer */
+#define PMAG_BA_BT459           0x200000        /* Bt459 RAMDAC */
+#define PMAG_BA_IRQ             0x300000        /* IRQ acknowledge */
+#define PMAG_BA_ROM             0x380000        /* REX option ROM */
+#define PMAG_BA_BT438           0x380000        /* Bt438 clock chip reset */
+#define PMAG_BA_SIZE            0x400000        /* address space size */
 
-#define PMAG_BA_ONBOARD_FBMEM_OFFSET    0x00000000
+/* Bt459 register offsets, byte-wide registers.  */
+#define BT459_ADDR_LO           0x0             /* address low */
+#define BT459_ADDR_HI           0x4             /* address high */
+#define BT459_DATA              0x8             /* data window register */
+#define BT459_CMAP              0xc             /* color map window register */