tgafb: TURBOchannel support

This is support for the TC variations of the TGA boards (properly known as
SFB+ or Smart Frame Buffer Plus boards).  The 8-plane SFB+ board uses the
Bt459 RAMDAC (unlike its PCI TGA counterpart, which uses the Bt485), so
bits have been added to support this chip as well.

Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Cc: "Antonino A. Daplas" <adaplas@pol.net>
Cc: James Simmons <jsimmons@infradead.org>
Acked-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 254 insertions, 56 deletions

diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig
index 0aeab4e725a4..bc9a12be1e33 100644
--- a/drivers/video/Kconfig
+++ b/drivers/video/Kconfig
@@ -525,15 +525,25 @@ config FB_HP300
         default y
 
 config FB_TGA
-        tristate "TGA framebuffer support"
-        depends on FB && ALPHA
+        tristate "TGA/SFB+ framebuffer support"
+        depends on FB && (ALPHA || TC)
         select FB_CFB_FILLRECT
         select FB_CFB_COPYAREA
         select FB_CFB_IMAGEBLIT
         select BITREVERSE
-        help
-          This is the frame buffer device driver for generic TGA graphic
-          cards. Say Y if you have one of those.
+        ---help---
+          This is the frame buffer device driver for generic TGA and SFB+
+          graphic cards.  These include DEC ZLXp-E1, -E2 and -E3 PCI cards,
+          also known as PBXGA-A, -B and -C, and DEC ZLX-E1, -E2 and -E3
+          TURBOchannel cards, also known as PMAGD-A, -B and -C.
+
+          Due to hardware limitations ZLX-E2 and E3 cards are not supported
+          for DECstation 5000/200 systems.  Additionally due to firmware
+          limitations these cards may cause troubles with booting DECstation
+          5000/240 and /260 systems, but are fully supported under Linux if
+          you manage to get it going. ;-)
+
+          Say Y if you have one of those.
 
 config FB_VESA
         bool "VESA VGA graphics support"
diff --git a/drivers/video/tgafb.c b/drivers/video/tgafb.c
index 7478d0e3e211..5345fe03cdfe 100644
--- a/drivers/video/tgafb.c
+++ b/drivers/video/tgafb.c
@@ -5,27 +5,45 @@
  *      Copyright (C) 1997 Geert Uytterhoeven
  *      Copyright (C) 1999,2000 Martin Lucina, Tom Zerucha
  *      Copyright (C) 2002 Richard Henderson
+ *      Copyright (C) 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/module.h>
-#include <linux/kernel.h>
-#include <linux/errno.h>
-#include <linux/string.h>
-#include <linux/mm.h>
-#include <linux/slab.h>
+#include <linux/bitrev.h>
 #include <linux/delay.h>
-#include <linux/init.h>
+#include <linux/device.h>
+#include <linux/errno.h>
 #include <linux/fb.h>
+#include <linux/init.h>
+#include <linux/ioport.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/module.h>
 #include <linux/pci.h>
 #include <linux/selection.h>
-#include <linux/bitrev.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+#include <linux/tc.h>
+
 #include <asm/io.h>
+
 #include <video/tgafb.h>
 
+#ifdef CONFIG_PCI
+#define TGA_BUS_PCI(dev) (dev->bus == &pci_bus_type)
+#else
+#define TGA_BUS_PCI(dev) 0
+#endif
+
+#ifdef CONFIG_TC
+#define TGA_BUS_TC(dev) (dev->bus == &tc_bus_type)
+#else
+#define TGA_BUS_TC(dev) 0
+#endif
+
 /*
  * Local functions.
  */
@@ -42,12 +60,16 @@ static void tgafb_imageblit(struct fb_info *, const struct fb_image *);
 static void tgafb_fillrect(struct fb_info *, const struct fb_fillrect *);
 static void tgafb_copyarea(struct fb_info *, const struct fb_copyarea *);
 
-static int __devinit tgafb_pci_register(struct pci_dev *,
-                                        const struct pci_device_id *);
-static void __devexit tgafb_pci_unregister(struct pci_dev *);
+static int __devinit tgafb_register(struct device *dev);
+static void __devexit tgafb_unregister(struct device *dev);
+
+static const char *mode_option;
+static const char *mode_option_pci = "640x480@60";
+static const char *mode_option_tc = "1280x1024@72";
 
-static const char *mode_option = "640x480@60";
 
+static struct pci_driver tgafb_pci_driver;
+static struct tc_driver tgafb_tc_driver;
 
 /*
  *  Frame buffer operations
@@ -65,9 +87,13 @@ static struct fb_ops tgafb_ops = {
 };
 
 
+#ifdef CONFIG_PCI
 /*
  *  PCI registration operations
  */
+static int __devinit tgafb_pci_register(struct pci_dev *,
+                                        const struct pci_device_id *);
+static void __devexit tgafb_pci_unregister(struct pci_dev *);
 
 static struct pci_device_id const tgafb_pci_table[] = {
         { PCI_DEVICE(PCI_VENDOR_ID_DEC, PCI_DEVICE_ID_DEC_TGA) },
@@ -75,13 +101,68 @@ static struct pci_device_id const tgafb_pci_table[] = {
 };
 MODULE_DEVICE_TABLE(pci, tgafb_pci_table);
 
-static struct pci_driver tgafb_driver = {
+static struct pci_driver tgafb_pci_driver = {
         .name                   = "tgafb",
         .id_table               = tgafb_pci_table,
         .probe                  = tgafb_pci_register,
         .remove                 = __devexit_p(tgafb_pci_unregister),
 };
 
+static int __devinit
+tgafb_pci_register(struct pci_dev *pdev, const struct pci_device_id *ent)
+{
+        return tgafb_register(&pdev->dev);
+}
+
+static void __devexit
+tgafb_pci_unregister(struct pci_dev *pdev)
+{
+        tgafb_unregister(&pdev->dev);
+}
+#endif /* CONFIG_PCI */
+
+#ifdef CONFIG_TC
+/*
+ *  TC registration operations
+ */
+static int __devinit tgafb_tc_register(struct device *);
+static int __devexit tgafb_tc_unregister(struct device *);
+
+static struct tc_device_id const tgafb_tc_table[] = {
+        { "DEC     ", "PMAGD-AA" },
+        { "DEC     ", "PMAGD   " },
+        { }
+};
+MODULE_DEVICE_TABLE(tc, tgafb_tc_table);
+
+static struct tc_driver tgafb_tc_driver = {
+        .id_table               = tgafb_tc_table,
+        .driver                 = {
+                .name           = "tgafb",
+                .bus            = &tc_bus_type,
+                .probe          = tgafb_tc_register,
+                .remove         = __devexit_p(tgafb_tc_unregister),
+        },
+};
+
+static int __devinit
+tgafb_tc_register(struct device *dev)
+{
+        int status = tgafb_register(dev);
+        if (!status)
+                get_device(dev);
+        return status;
+}
+
+static int __devexit
+tgafb_tc_unregister(struct device *dev)
+{
+        put_device(dev);
+        tgafb_unregister(dev);
+        return 0;
+}
+#endif /* CONFIG_TC */
+
 
 /**
  *      tgafb_check_var - Optional function.  Validates a var passed in.
@@ -132,10 +213,10 @@ static int
 tgafb_set_par(struct fb_info *info)
 {
         static unsigned int const deep_presets[4] = {
-                0x00014000,
-                0x0001440d,
+                0x00004000,
+                0x0000440d,
                 0xffffffff,
-                0x0001441d
+                0x0000441d
         };
         static unsigned int const rasterop_presets[4] = {
                 0x00000003,
@@ -157,6 +238,8 @@ tgafb_set_par(struct fb_info *info)
         };
 
         struct tga_par *par = (struct tga_par *) info->par;
+        int tga_bus_pci = TGA_BUS_PCI(par->dev);
+        int tga_bus_tc = TGA_BUS_TC(par->dev);
         u32 htimings, vtimings, pll_freq;
         u8 tga_type;
         int i;
@@ -221,7 +304,7 @@ tgafb_set_par(struct fb_info *info)
         TGA_WRITE_REG(par, vtimings, TGA_VERT_REG);
 
         /* Initalise RAMDAC. */
-        if (tga_type == TGA_TYPE_8PLANE) {
+        if (tga_type == TGA_TYPE_8PLANE && tga_bus_pci) {
 
                 /* Init BT485 RAMDAC registers.  */
                 BT485_WRITE(par, 0xa2 | (par->sync_on_green ? 0x8 : 0x0),
@@ -261,6 +344,38 @@ tgafb_set_par(struct fb_info *info)
                                       TGA_RAMDAC_REG);
                 }
 
+        } else if (tga_type == TGA_TYPE_8PLANE && tga_bus_tc) {
+
+                /* Init BT459 RAMDAC registers.  */
+                BT459_WRITE(par, BT459_REG_ACC, BT459_CMD_REG_0, 0x40);
+                BT459_WRITE(par, BT459_REG_ACC, BT459_CMD_REG_1, 0x00);
+                BT459_WRITE(par, BT459_REG_ACC, BT459_CMD_REG_2,
+                            (par->sync_on_green ? 0xc0 : 0x40));
+
+                BT459_WRITE(par, BT459_REG_ACC, BT459_CUR_CMD_REG, 0x00);
+
+                /* Fill the palette.  */
+                BT459_LOAD_ADDR(par, 0x0000);
+                TGA_WRITE_REG(par, BT459_PALETTE << 2, TGA_RAMDAC_SETUP_REG);
+
+#ifdef CONFIG_HW_CONSOLE
+                for (i = 0; i < 16; i++) {
+                        int j = color_table[i];
+
+                        TGA_WRITE_REG(par, default_red[j], TGA_RAMDAC_REG);
+                        TGA_WRITE_REG(par, default_grn[j], TGA_RAMDAC_REG);
+                        TGA_WRITE_REG(par, default_blu[j], TGA_RAMDAC_REG);
+                }
+                for (i = 0; i < 240 * 3; i += 4) {
+#else
+                for (i = 0; i < 256 * 3; i += 4) {
+#endif
+                        TGA_WRITE_REG(par, 0x55, TGA_RAMDAC_REG);
+                        TGA_WRITE_REG(par, 0x00, TGA_RAMDAC_REG);
+                        TGA_WRITE_REG(par, 0x00, TGA_RAMDAC_REG);
+                        TGA_WRITE_REG(par, 0x00, TGA_RAMDAC_REG);
+                }
+
         } else { /* 24-plane or 24plusZ */
 
                 /* Init BT463 RAMDAC registers.  */
@@ -431,6 +546,8 @@ tgafb_setcolreg(unsigned regno, unsigned red, unsigned green, unsigned blue,
                 unsigned transp, struct fb_info *info)
 {
         struct tga_par *par = (struct tga_par *) info->par;
+        int tga_bus_pci = TGA_BUS_PCI(par->dev);
+        int tga_bus_tc = TGA_BUS_TC(par->dev);
 
         if (regno > 255)
                 return 1;
@@ -438,12 +555,18 @@ tgafb_setcolreg(unsigned regno, unsigned red, unsigned green, unsigned blue,
         green >>= 8;
         blue >>= 8;
 
-        if (par->tga_type == TGA_TYPE_8PLANE) {
+        if (par->tga_type == TGA_TYPE_8PLANE && tga_bus_pci) {
                 BT485_WRITE(par, regno, BT485_ADDR_PAL_WRITE);
                 TGA_WRITE_REG(par, BT485_DATA_PAL, TGA_RAMDAC_SETUP_REG);
                 TGA_WRITE_REG(par, red|(BT485_DATA_PAL<<8),TGA_RAMDAC_REG);
                 TGA_WRITE_REG(par, green|(BT485_DATA_PAL<<8),TGA_RAMDAC_REG);
                 TGA_WRITE_REG(par, blue|(BT485_DATA_PAL<<8),TGA_RAMDAC_REG);
+        } else if (par->tga_type == TGA_TYPE_8PLANE && tga_bus_tc) {
+                BT459_LOAD_ADDR(par, regno);
+                TGA_WRITE_REG(par, BT459_PALETTE << 2, TGA_RAMDAC_SETUP_REG);
+                TGA_WRITE_REG(par, red, TGA_RAMDAC_REG);
+                TGA_WRITE_REG(par, green, TGA_RAMDAC_REG);
+                TGA_WRITE_REG(par, blue, TGA_RAMDAC_REG);
         } else {
                 if (regno < 16) {
                         u32 value = (regno << 16) | (regno << 8) | regno;
@@ -1309,18 +1432,29 @@ static void
 tgafb_init_fix(struct fb_info *info)
 {
         struct tga_par *par = (struct tga_par *)info->par;
+        int tga_bus_pci = TGA_BUS_PCI(par->dev);
+        int tga_bus_tc = TGA_BUS_TC(par->dev);
         u8 tga_type = par->tga_type;
-        const char *tga_type_name;
+        const char *tga_type_name = NULL;
 
         switch (tga_type) {
         case TGA_TYPE_8PLANE:
-                tga_type_name = "Digital ZLXp-E1";
+                if (tga_bus_pci)
+                        tga_type_name = "Digital ZLXp-E1";
+                if (tga_bus_tc)
+                        tga_type_name = "Digital ZLX-E1";
                 break;
         case TGA_TYPE_24PLANE:
-                tga_type_name = "Digital ZLXp-E2";
+                if (tga_bus_pci)
+                        tga_type_name = "Digital ZLXp-E2";
+                if (tga_bus_tc)
+                        tga_type_name = "Digital ZLX-E2";
                 break;
         case TGA_TYPE_24PLUSZ:
-                tga_type_name = "Digital ZLXp-E3";
+                if (tga_bus_pci)
+                        tga_type_name = "Digital ZLXp-E3";
+                if (tga_bus_tc)
+                        tga_type_name = "Digital ZLX-E3";
                 break;
         default:
                 tga_type_name = "Unknown";
@@ -1348,9 +1482,15 @@ tgafb_init_fix(struct fb_info *info)
         info->fix.accel = FB_ACCEL_DEC_TGA;
 }
 
-static __devinit int
-tgafb_pci_register(struct pci_dev *pdev, const struct pci_device_id *ent)
+static int __devinit
+tgafb_register(struct device *dev)
 {
+        static const struct fb_videomode modedb_tc = {
+                /* 1280x1024 @ 72 Hz, 76.8 kHz hsync */
+                "1280x1024@72", 0, 1280, 1024, 7645, 224, 28, 33, 3, 160, 3,
+                FB_SYNC_ON_GREEN, FB_VMODE_NONINTERLACED
+        };
+
         static unsigned int const fb_offset_presets[4] = {
                 TGA_8PLANE_FB_OFFSET,
                 TGA_24PLANE_FB_OFFSET,
@@ -1358,40 +1498,51 @@ tgafb_pci_register(struct pci_dev *pdev, const struct pci_device_id *ent)
                 TGA_24PLUSZ_FB_OFFSET
         };
 
+        const struct fb_videomode *modedb_tga = NULL;
+        resource_size_t bar0_start = 0, bar0_len = 0;
+        const char *mode_option_tga = NULL;
+        int tga_bus_pci = TGA_BUS_PCI(dev);
+        int tga_bus_tc = TGA_BUS_TC(dev);
+        unsigned int modedbsize_tga = 0;
         void __iomem *mem_base;
-        unsigned long bar0_start, bar0_len;
         struct fb_info *info;
         struct tga_par *par;
         u8 tga_type;
-        int ret;
+        int ret = 0;
 
         /* Enable device in PCI config.  */
-        if (pci_enable_device(pdev)) {
+        if (tga_bus_pci && pci_enable_device(to_pci_dev(dev))) {
                 printk(KERN_ERR "tgafb: Cannot enable PCI device\n");
                 return -ENODEV;
         }
 
         /* Allocate the fb and par structures.  */
-        info = framebuffer_alloc(sizeof(struct tga_par), &pdev->dev);
+        info = framebuffer_alloc(sizeof(struct tga_par), dev);
         if (!info) {
                 printk(KERN_ERR "tgafb: Cannot allocate memory\n");
                 return -ENOMEM;
         }
 
         par = info->par;
-        pci_set_drvdata(pdev, info);
+        dev_set_drvdata(dev, info);
 
         /* Request the mem regions.  */
-        bar0_start = pci_resource_start(pdev, 0);
-        bar0_len = pci_resource_len(pdev, 0);
         ret = -ENODEV;
+        if (tga_bus_pci) {
+                bar0_start = pci_resource_start(to_pci_dev(dev), 0);
+                bar0_len = pci_resource_len(to_pci_dev(dev), 0);
+        }
+        if (tga_bus_tc) {
+                bar0_start = to_tc_dev(dev)->resource.start;
+                bar0_len = to_tc_dev(dev)->resource.end - bar0_start + 1;
+        }
         if (!request_mem_region (bar0_start, bar0_len, "tgafb")) {
                 printk(KERN_ERR "tgafb: cannot reserve FB region\n");
                 goto err0;
         }
 
         /* Map the framebuffer.  */
-        mem_base = ioremap(bar0_start, bar0_len);
+        mem_base = ioremap_nocache(bar0_start, bar0_len);
         if (!mem_base) {
                 printk(KERN_ERR "tgafb: Cannot map MMIO\n");
                 goto err1;
@@ -1399,12 +1550,16 @@ tgafb_pci_register(struct pci_dev *pdev, const struct pci_device_id *ent)
 
         /* Grab info about the card.  */
         tga_type = (readl(mem_base) >> 12) & 0x0f;
-        par->pdev = pdev;
+        par->dev = dev;
         par->tga_mem_base = mem_base;
         par->tga_fb_base = mem_base + fb_offset_presets[tga_type];
         par->tga_regs_base = mem_base + TGA_REGS_OFFSET;
         par->tga_type = tga_type;
-        pci_read_config_byte(pdev, PCI_REVISION_ID, &par->tga_chip_rev);
+        if (tga_bus_pci)
+                pci_read_config_byte(to_pci_dev(dev), PCI_REVISION_ID,
+                                     &par->tga_chip_rev);
+        if (tga_bus_tc)
+                par->tga_chip_rev = TGA_READ_REG(par, TGA_START_REG) & 0xff;
 
         /* Setup framebuffer.  */
         info->flags = FBINFO_DEFAULT | FBINFO_HWACCEL_COPYAREA |
@@ -1414,8 +1569,17 @@ tgafb_pci_register(struct pci_dev *pdev, const struct pci_device_id *ent)
         info->pseudo_palette = (void *)(par + 1);
 
         /* This should give a reasonable default video mode.  */
-
-        ret = fb_find_mode(&info->var, info, mode_option, NULL, 0, NULL,
+        if (tga_bus_pci) {
+                mode_option_tga = mode_option_pci;
+        }
+        if (tga_bus_tc) {
+                mode_option_tga = mode_option_tc;
+                modedb_tga = &modedb_tc;
+                modedbsize_tga = 1;
+        }
+        ret = fb_find_mode(&info->var, info,
+                           mode_option ? mode_option : mode_option_tga,
+                           modedb_tga, modedbsize_tga, NULL,
                            tga_type == TGA_TYPE_8PLANE ? 8 : 32);
         if (ret == 0 || ret == 4) {
                 printk(KERN_ERR "tgafb: Could not find valid video mode\n");
@@ -1438,13 +1602,19 @@ tgafb_pci_register(struct pci_dev *pdev, const struct pci_device_id *ent)
                 goto err1;
         }
 
-        printk(KERN_INFO "tgafb: DC21030 [TGA] detected, rev=0x%02x\n",
-               par->tga_chip_rev);
-        printk(KERN_INFO "tgafb: at PCI bus %d, device %d, function %d\n",
-               pdev->bus->number, PCI_SLOT(pdev->devfn),
-               PCI_FUNC(pdev->devfn));
-        printk(KERN_INFO "fb%d: %s frame buffer device at 0x%lx\n",
-               info->node, info->fix.id, bar0_start);
+        if (tga_bus_pci) {
+                pr_info("tgafb: DC21030 [TGA] detected, rev=0x%02x\n",
+                        par->tga_chip_rev);
+                pr_info("tgafb: at PCI bus %d, device %d, function %d\n",
+                        to_pci_dev(dev)->bus->number,
+                        PCI_SLOT(to_pci_dev(dev)->devfn),
+                        PCI_FUNC(to_pci_dev(dev)->devfn));
+        }
+        if (tga_bus_tc)
+                pr_info("tgafb: SFB+ detected, rev=0x%02x\n",
+                        par->tga_chip_rev);
+        pr_info("fb%d: %s frame buffer device at 0x%lx\n",
+                info->node, info->fix.id, (long)bar0_start);
 
         return 0;
 
@@ -1458,25 +1628,39 @@ tgafb_pci_register(struct pci_dev *pdev, const struct pci_device_id *ent)
 }
 
 static void __devexit
-tgafb_pci_unregister(struct pci_dev *pdev)
+tgafb_unregister(struct device *dev)
 {
-        struct fb_info *info = pci_get_drvdata(pdev);
-        struct tga_par *par = info->par;
+        resource_size_t bar0_start = 0, bar0_len = 0;
+        int tga_bus_pci = TGA_BUS_PCI(dev);
+        int tga_bus_tc = TGA_BUS_TC(dev);
+        struct fb_info *info = NULL;
+        struct tga_par *par;
 
+        info = dev_get_drvdata(dev);
         if (!info)
                 return;
+
+        par = info->par;
         unregister_framebuffer(info);
         fb_dealloc_cmap(&info->cmap);
         iounmap(par->tga_mem_base);
-        release_mem_region(pci_resource_start(pdev, 0),
-                           pci_resource_len(pdev, 0));
+        if (tga_bus_pci) {
+                bar0_start = pci_resource_start(to_pci_dev(dev), 0);
+                bar0_len = pci_resource_len(to_pci_dev(dev), 0);
+        }
+        if (tga_bus_tc) {
+                bar0_start = to_tc_dev(dev)->resource.start;
+                bar0_len = to_tc_dev(dev)->resource.end - bar0_start + 1;
+        }
+        release_mem_region(bar0_start, bar0_len);
         framebuffer_release(info);
 }
 
 static void __devexit
 tgafb_exit(void)
 {
-        pci_unregister_driver(&tgafb_driver);
+        tc_unregister_driver(&tgafb_tc_driver);
+        pci_unregister_driver(&tgafb_pci_driver);
 }
 
 #ifndef MODULE
@@ -1505,6 +1689,7 @@ tgafb_setup(char *arg)
 static int __devinit
 tgafb_init(void)
 {
+        int status;
 #ifndef MODULE
         char *option = NULL;
 
@@ -1512,7 +1697,10 @@ tgafb_init(void)
                 return -ENODEV;
         tgafb_setup(option);
 #endif
-        return pci_register_driver(&tgafb_driver);
+        status = pci_register_driver(&tgafb_pci_driver);
+        if (!status)
+                status = tc_register_driver(&tgafb_tc_driver);
+        return status;
 }
 
 /*
@@ -1522,5 +1710,5 @@ tgafb_init(void)
 module_init(tgafb_init);
 module_exit(tgafb_exit);
 
-MODULE_DESCRIPTION("framebuffer driver for TGA chipset");
+MODULE_DESCRIPTION("Framebuffer driver for TGA/SFB+ chipset");
 MODULE_LICENSE("GPL");