[TC] pmagb-b-fb: Convert to the driver model

This is a set of changes to convert the driver to the driver model.  As a
side-effect the driver now supports building as a module.

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

2 files changed, 58 insertions, 44 deletions

diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig
index 18c22ba6e656..45fe65d8d7a0 100644
--- a/drivers/video/Kconfig
+++ b/drivers/video/Kconfig
@@ -1454,8 +1454,8 @@ config FB_PMAG_BA
           used mainly in the MIPS-based DECstation series.
 
 config FB_PMAGB_B
-        bool "PMAGB-B TURBOchannel framebuffer support"
-        depends on (FB = y) && TC
+        tristate "PMAGB-B TURBOchannel framebuffer support"
+        depends on TC
         select FB_CFB_FILLRECT
         select FB_CFB_COPYAREA
         select FB_CFB_IMAGEBLIT
diff --git a/drivers/video/pmagb-b-fb.c b/drivers/video/pmagb-b-fb.c
index a06a064ad757..7a0ce7d5af6b 100644
--- a/drivers/video/pmagb-b-fb.c
+++ b/drivers/video/pmagb-b-fb.c
@@ -11,7 +11,7 @@
  *      Michael Engel <engel@unix-ag.org>,
  *      Karsten Merker <merker@linuxtag.org> and
  *      Harald Koerfgen.
- *      Copyright (c) 2005  Maciej W. Rozycki
+ *      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
@@ -25,18 +25,16 @@
 #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 <asm/dec/tc.h>
-
 #include <video/pmagb-b-fb.h>
 
 
 struct pmagbbfb_par {
-        struct fb_info *next;
         volatile void __iomem *mmio;
         volatile void __iomem *smem;
         volatile u32 __iomem *sfb;
@@ -47,8 +45,6 @@ struct pmagbbfb_par {
 };
 
 
-static struct fb_info *root_pmagbbfb_dev;
-
 static struct fb_var_screeninfo pmagbbfb_defined __initdata = {
         .bits_per_pixel = 8,
         .red.length     = 8,
@@ -190,8 +186,9 @@ static void __init pmagbbfb_osc_setup(struct fb_info *info)
                 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 = get_tc_speed() / 250;
+        u32 freq0, freq1, freqtc = tc_get_speed(tbus) / 250;
         int i, j;
 
         gp0_write(par, 0);                              /* select Osc0 */
@@ -249,26 +246,21 @@ static void __init pmagbbfb_osc_setup(struct fb_info *info)
 };
 
 
-static int __init pmagbbfb_init_one(int slot)
+static int __init pmagbbfb_probe(struct device *dev)
 {
-        char freq0[12], freq1[12];
+        struct tc_dev *tdev = to_tc_dev(dev);
+        resource_size_t start, len;
         struct fb_info *info;
         struct pmagbbfb_par *par;
-        unsigned long base_addr;
+        char freq0[12], freq1[12];
         u32 vid_base;
 
-        info = framebuffer_alloc(sizeof(struct pmagbbfb_par), NULL);
+        info = framebuffer_alloc(sizeof(struct pmagbbfb_par), dev);
         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;
+        dev_set_drvdata(dev, info);
 
         if (fb_alloc_cmap(&info->cmap, 256, 0) < 0)
                 goto err_alloc;
@@ -278,16 +270,22 @@ static int __init pmagbbfb_init_one(int slot)
         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))
+                goto err_cmap;
+
         /* MMIO mapping setup.  */
-        info->fix.mmio_start = base_addr;
+        info->fix.mmio_start = start;
         par->mmio = ioremap_nocache(info->fix.mmio_start, info->fix.mmio_len);
         if (!par->mmio)
-                goto err_cmap;
+                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 = base_addr + PMAGB_B_FBMEM;
+        info->fix.smem_start = start + PMAGB_B_FBMEM;
         par->smem = ioremap_nocache(info->fix.smem_start, info->fix.smem_len);
         if (!par->smem)
                 goto err_mmio_map;
@@ -302,13 +300,15 @@ static int __init pmagbbfb_init_one(int slot)
         if (register_framebuffer(info) < 0)
                 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 in slot %d\n",
-                info->node, info->fix.id, par->slot);
+        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);
@@ -322,54 +322,68 @@ err_smem_map:
 err_mmio_map:
         iounmap(par->mmio);
 
+err_resource:
+        release_mem_region(start, len);
+
 err_cmap:
         fb_dealloc_cmap(&info->cmap);
 
 err_alloc:
-        root_pmagbbfb_dev = par->next;
-        release_tc_card(par->slot);
         framebuffer_release(info);
         return -ENXIO;
 }
 
-static void __exit pmagbbfb_exit_one(void)
+static int __exit pmagbbfb_remove(struct device *dev)
 {
-        struct fb_info *info = root_pmagbbfb_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);
-        root_pmagbbfb_dev = par->next;
-        release_tc_card(par->slot);
         framebuffer_release(info);
+        return 0;
 }
 
 
 /*
- * Initialise the framebuffer.
+ * 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)
 {
-        int count = 0;
-        int slot;
-
+#ifndef MODULE
         if (fb_get_options("pmagbbfb", NULL))
                 return -ENXIO;
-
-        while ((slot = search_tc_card("PMAGB-BA")) >= 0) {
-                if (pmagbbfb_init_one(slot) < 0)
-                        break;
-                count++;
-        }
-        return (count > 0) ? 0 : -ENXIO;
+#endif
+        return tc_register_driver(&pmagbbfb_driver);
 }
 
 static void __exit pmagbbfb_exit(void)
 {
-        while (root_pmagbbfb_dev)
-                pmagbbfb_exit_one();
+        tc_unregister_driver(&pmagbbfb_driver);
 }