/*
- * xilinxfb.c
- *
- * Xilinx TFT LCD frame buffer driver
+ * Xilinx TFT frame buffer driver
*
* Author: MontaVista Software, Inc.
* source@mvista.com
*
* 2002-2007 (c) MontaVista Software, Inc.
* 2007 (c) Secret Lab Technologies, Ltd.
+ * 2009 (c) Xilinx Inc.
*
* This file is licensed under the terms of the GNU General Public License
* version 2. This program is licensed "as is" without any warranty of any
#include <linux/device.h>
#include <linux/module.h>
#include <linux/kernel.h>
+#include <linux/version.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/fb.h>
#include <linux/init.h>
#include <linux/dma-mapping.h>
-#include <linux/platform_device.h>
-#if defined(CONFIG_OF)
#include <linux/of_device.h>
#include <linux/of_platform.h>
-#endif
-#include <asm/io.h>
+#include <linux/io.h>
#include <linux/xilinxfb.h>
+#include <asm/dcr.h>
#define DRIVER_NAME "xilinxfb"
-#define DRIVER_DESCRIPTION "Xilinx TFT LCD frame buffer driver"
+
/*
* Xilinx calls it "PLB TFT LCD Controller" though it can also be used for
- * the VGA port on the Xilinx ML40x board. This is a hardware display controller
- * for a 640x480 resolution TFT or VGA screen.
+ * the VGA port on the Xilinx ML40x board. This is a hardware display
+ * controller for a 640x480 resolution TFT or VGA screen.
*
* The interface to the framebuffer is nice and simple. There are two
* control registers. The first tells the LCD interface where in memory
* the frame buffer is (only the 11 most significant bits are used, so
* don't start thinking about scrolling). The second allows the LCD to
* be turned on or off as well as rotated 180 degrees.
+ *
+ * In case of direct PLB access the second control register will be at
+ * an offset of 4 as compared to the DCR access where the offset is 1
+ * i.e. REG_CTRL. So this is taken care in the function
+ * xilinx_fb_out_be32 where it left shifts the offset 2 times in case of
+ * direct PLB access.
*/
#define NUM_REGS 2
#define REG_FB_ADDR 0
.activate = FB_ACTIVATE_NOW
};
+
+#define PLB_ACCESS_FLAG 0x1 /* 1 = PLB, 0 = DCR */
+
struct xilinxfb_drvdata {
struct fb_info info; /* FB driver info record */
- u32 regs_phys; /* phys. address of the control registers */
- u32 __iomem *regs; /* virt. address of the control registers */
+ phys_addr_t regs_phys; /* phys. address of the control
+ registers */
+ void __iomem *regs; /* virt. address of the control
+ registers */
+
+ dcr_host_t dcr_host;
+ unsigned int dcr_start;
+ unsigned int dcr_len;
void *fb_virt; /* virt. address of the frame buffer */
dma_addr_t fb_phys; /* phys. address of the frame buffer */
int fb_alloced; /* Flag, was the fb memory alloced? */
+ u8 flags; /* features of the driver */
+
u32 reg_ctrl_default;
u32 pseudo_palette[PALETTE_ENTRIES_NO];
container_of(_info, struct xilinxfb_drvdata, info)
/*
- * The LCD controller has DCR interface to its registers, but all
- * the boards and configurations the driver has been tested with
- * use opb2dcr bridge. So the registers are seen as memory mapped.
- * This macro is to make it simple to add the direct DCR access
- * when it's needed.
+ * The XPS TFT Controller can be accessed through PLB or DCR interface.
+ * To perform the read/write on the registers we need to check on
+ * which bus its connected and call the appropriate write API.
*/
-#define xilinx_fb_out_be32(driverdata, offset, val) \
- out_be32(driverdata->regs + offset, val)
+static void xilinx_fb_out_be32(struct xilinxfb_drvdata *drvdata, u32 offset,
+ u32 val)
+{
+ if (drvdata->flags & PLB_ACCESS_FLAG)
+ out_be32(drvdata->regs + (offset << 2), val);
+ else
+ dcr_write(drvdata->dcr_host, offset, val);
+
+}
static int
xilinx_fb_setcolreg(unsigned regno, unsigned red, unsigned green, unsigned blue,
* Bus independent setup/teardown
*/
-static int xilinxfb_assign(struct device *dev, unsigned long physaddr,
+static int xilinxfb_assign(struct device *dev,
+ struct xilinxfb_drvdata *drvdata,
+ unsigned long physaddr,
struct xilinxfb_platform_data *pdata)
{
- struct xilinxfb_drvdata *drvdata;
int rc;
int fbsize = pdata->xvirt * pdata->yvirt * BYTES_PER_PIXEL;
- /* Allocate the driver data region */
- drvdata = kzalloc(sizeof(*drvdata), GFP_KERNEL);
- if (!drvdata) {
- dev_err(dev, "Couldn't allocate device private record\n");
- return -ENOMEM;
- }
- dev_set_drvdata(dev, drvdata);
-
- /* Map the control registers in */
- if (!request_mem_region(physaddr, 8, DRIVER_NAME)) {
- dev_err(dev, "Couldn't lock memory region at 0x%08lX\n",
- physaddr);
- rc = -ENODEV;
- goto err_region;
- }
- drvdata->regs_phys = physaddr;
- drvdata->regs = ioremap(physaddr, 8);
- if (!drvdata->regs) {
- dev_err(dev, "Couldn't lock memory region at 0x%08lX\n",
- physaddr);
- rc = -ENODEV;
- goto err_map;
+ if (drvdata->flags & PLB_ACCESS_FLAG) {
+ /*
+ * Map the control registers in if the controller
+ * is on direct PLB interface.
+ */
+ if (!request_mem_region(physaddr, 8, DRIVER_NAME)) {
+ dev_err(dev, "Couldn't lock memory region at 0x%08lX\n",
+ physaddr);
+ rc = -ENODEV;
+ goto err_region;
+ }
+
+ drvdata->regs_phys = physaddr;
+ drvdata->regs = ioremap(physaddr, 8);
+ if (!drvdata->regs) {
+ dev_err(dev, "Couldn't lock memory region at 0x%08lX\n",
+ physaddr);
+ rc = -ENODEV;
+ goto err_map;
+ }
}
/* Allocate the framebuffer memory */
if (!drvdata->fb_virt) {
dev_err(dev, "Could not allocate frame buffer memory\n");
rc = -ENOMEM;
- goto err_fbmem;
+ if (drvdata->flags & PLB_ACCESS_FLAG)
+ goto err_fbmem;
+ else
+ goto err_region;
}
/* Clear (turn to black) the framebuffer */
drvdata->reg_ctrl_default = REG_CTRL_ENABLE;
if (pdata->rotate_screen)
drvdata->reg_ctrl_default |= REG_CTRL_ROTATE;
- xilinx_fb_out_be32(drvdata, REG_CTRL, drvdata->reg_ctrl_default);
+ xilinx_fb_out_be32(drvdata, REG_CTRL,
+ drvdata->reg_ctrl_default);
/* Fill struct fb_info */
drvdata->info.device = dev;
goto err_regfb;
}
+ if (drvdata->flags & PLB_ACCESS_FLAG) {
+ /* Put a banner in the log (for DEBUG) */
+ dev_dbg(dev, "regs: phys=%lx, virt=%p\n", physaddr,
+ drvdata->regs);
+ }
/* Put a banner in the log (for DEBUG) */
- dev_dbg(dev, "regs: phys=%lx, virt=%p\n", physaddr, drvdata->regs);
- dev_dbg(dev, "fb: phys=%llx, virt=%p, size=%x\n",
- (unsigned long long) drvdata->fb_phys, drvdata->fb_virt,
- fbsize);
+ dev_dbg(dev, "fb: phys=%p, virt=%p, size=%x\n",
+ (void *)drvdata->fb_phys, drvdata->fb_virt, fbsize);
return 0; /* success */
if (drvdata->fb_alloced)
dma_free_coherent(dev, PAGE_ALIGN(fbsize), drvdata->fb_virt,
drvdata->fb_phys);
+ else
+ iounmap(drvdata->fb_virt);
+
/* Turn off the display */
xilinx_fb_out_be32(drvdata, REG_CTRL, 0);
err_fbmem:
- iounmap(drvdata->regs);
+ if (drvdata->flags & PLB_ACCESS_FLAG)
+ iounmap(drvdata->regs);
err_map:
- release_mem_region(physaddr, 8);
+ if (drvdata->flags & PLB_ACCESS_FLAG)
+ release_mem_region(physaddr, 8);
err_region:
kfree(drvdata);
if (drvdata->fb_alloced)
dma_free_coherent(dev, PAGE_ALIGN(drvdata->info.fix.smem_len),
drvdata->fb_virt, drvdata->fb_phys);
+ else
+ iounmap(drvdata->fb_virt);
/* Turn off the display */
xilinx_fb_out_be32(drvdata, REG_CTRL, 0);
- iounmap(drvdata->regs);
- release_mem_region(drvdata->regs_phys, 8);
+ /* Release the resources, as allocated based on interface */
+ if (drvdata->flags & PLB_ACCESS_FLAG) {
+ iounmap(drvdata->regs);
+ release_mem_region(drvdata->regs_phys, 8);
+ } else
+ dcr_unmap(drvdata->dcr_host, drvdata->dcr_len);
kfree(drvdata);
dev_set_drvdata(dev, NULL);
return 0;
}
-/* ---------------------------------------------------------------------
- * Platform bus binding
- */
-
-static int
-xilinxfb_platform_probe(struct platform_device *pdev)
-{
- struct xilinxfb_platform_data *pdata;
- struct resource *res;
-
- /* Find the registers address */
- res = platform_get_resource(pdev, IORESOURCE_IO, 0);
- if (!res) {
- dev_err(&pdev->dev, "Couldn't get registers resource\n");
- return -ENODEV;
- }
-
- /* If a pdata structure is provided, then extract the parameters */
- pdata = &xilinx_fb_default_pdata;
- if (pdev->dev.platform_data) {
- pdata = pdev->dev.platform_data;
- if (!pdata->xres)
- pdata->xres = xilinx_fb_default_pdata.xres;
- if (!pdata->yres)
- pdata->yres = xilinx_fb_default_pdata.yres;
- if (!pdata->xvirt)
- pdata->xvirt = xilinx_fb_default_pdata.xvirt;
- if (!pdata->yvirt)
- pdata->yvirt = xilinx_fb_default_pdata.yvirt;
- }
-
- return xilinxfb_assign(&pdev->dev, res->start, pdata);
-}
-
-static int
-xilinxfb_platform_remove(struct platform_device *pdev)
-{
- return xilinxfb_release(&pdev->dev);
-}
-
-
-static struct platform_driver xilinxfb_platform_driver = {
- .probe = xilinxfb_platform_probe,
- .remove = xilinxfb_platform_remove,
- .driver = {
- .owner = THIS_MODULE,
- .name = DRIVER_NAME,
- },
-};
-
/* ---------------------------------------------------------------------
* OF bus binding
*/
-#if defined(CONFIG_OF)
static int __devinit
xilinxfb_of_probe(struct of_device *op, const struct of_device_id *match)
{
- struct resource res;
const u32 *prop;
+ u32 *p;
+ u32 tft_access;
struct xilinxfb_platform_data pdata;
+ struct resource res;
int size, rc;
+ int start = 0, len = 0;
+ dcr_host_t dcr_host;
+ struct xilinxfb_drvdata *drvdata;
/* Copy with the default pdata (not a ptr reference!) */
pdata = xilinx_fb_default_pdata;
dev_dbg(&op->dev, "xilinxfb_of_probe(%p, %p)\n", op, match);
- rc = of_address_to_resource(op->node, 0, &res);
- if (rc) {
- dev_err(&op->dev, "invalid address\n");
- return rc;
+ /*
+ * To check whether the core is connected directly to DCR or PLB
+ * interface and initialize the tft_access accordingly.
+ */
+ p = (u32 *)of_get_property(op->node, "xlnx,dcr-splb-slave-if", NULL);
+
+ if (p)
+ tft_access = *p;
+ else
+ tft_access = 0; /* For backward compatibility */
+
+ /*
+ * Fill the resource structure if its direct PLB interface
+ * otherwise fill the dcr_host structure.
+ */
+ if (tft_access) {
+ rc = of_address_to_resource(op->node, 0, &res);
+ if (rc) {
+ dev_err(&op->dev, "invalid address\n");
+ return -ENODEV;
+ }
+
+ } else {
+ start = dcr_resource_start(op->node, 0);
+ len = dcr_resource_len(op->node, 0);
+ dcr_host = dcr_map(op->node, start, len);
+ if (!DCR_MAP_OK(dcr_host)) {
+ dev_err(&op->dev, "invalid address\n");
+ return -ENODEV;
+ }
}
prop = of_get_property(op->node, "phys-size", &size);
if (of_find_property(op->node, "rotate-display", NULL))
pdata.rotate_screen = 1;
- return xilinxfb_assign(&op->dev, res.start, &pdata);
+ /* Allocate the driver data region */
+ drvdata = kzalloc(sizeof(*drvdata), GFP_KERNEL);
+ if (!drvdata) {
+ dev_err(&op->dev, "Couldn't allocate device private record\n");
+ return -ENOMEM;
+ }
+ dev_set_drvdata(&op->dev, drvdata);
+
+ if (tft_access)
+ drvdata->flags |= PLB_ACCESS_FLAG;
+
+ /* Arguments are passed based on the interface */
+ if (drvdata->flags & PLB_ACCESS_FLAG) {
+ return xilinxfb_assign(&op->dev, drvdata, res.start, &pdata);
+ } else {
+ drvdata->dcr_start = start;
+ drvdata->dcr_len = len;
+ drvdata->dcr_host = dcr_host;
+ return xilinxfb_assign(&op->dev, drvdata, 0, &pdata);
+ }
}
static int __devexit xilinxfb_of_remove(struct of_device *op)
/* Match table for of_platform binding */
static struct of_device_id xilinxfb_of_match[] __devinitdata = {
+ { .compatible = "xlnx,xps-tft-1.00.a", },
{ .compatible = "xlnx,plb-tft-cntlr-ref-1.00.a", },
+ { .compatible = "xlnx,plb-dvi-cntlr-ref-1.00.c", },
{},
};
MODULE_DEVICE_TABLE(of, xilinxfb_of_match);
},
};
-/* Registration helpers to keep the number of #ifdefs to a minimum */
-static inline int __init xilinxfb_of_register(void)
-{
- pr_debug("xilinxfb: calling of_register_platform_driver()\n");
- return of_register_platform_driver(&xilinxfb_of_driver);
-}
-
-static inline void __exit xilinxfb_of_unregister(void)
-{
- of_unregister_platform_driver(&xilinxfb_of_driver);
-}
-#else /* CONFIG_OF */
-/* CONFIG_OF not enabled; do nothing helpers */
-static inline int __init xilinxfb_of_register(void) { return 0; }
-static inline void __exit xilinxfb_of_unregister(void) { }
-#endif /* CONFIG_OF */
/* ---------------------------------------------------------------------
* Module setup and teardown
static int __init
xilinxfb_init(void)
{
- int rc;
- rc = xilinxfb_of_register();
- if (rc)
- return rc;
-
- rc = platform_driver_register(&xilinxfb_platform_driver);
- if (rc)
- xilinxfb_of_unregister();
-
- return rc;
+ return of_register_platform_driver(&xilinxfb_of_driver);
}
static void __exit
xilinxfb_cleanup(void)
{
- platform_driver_unregister(&xilinxfb_platform_driver);
- xilinxfb_of_unregister();
+ of_unregister_platform_driver(&xilinxfb_of_driver);
}
module_init(xilinxfb_init);
module_exit(xilinxfb_cleanup);
MODULE_AUTHOR("MontaVista Software, Inc. <source@mvista.com>");
-MODULE_DESCRIPTION(DRIVER_DESCRIPTION);
+MODULE_DESCRIPTION("Xilinx TFT frame buffer driver");
MODULE_LICENSE("GPL");
projects / mirror_ubuntu-jammy-kernel.git / commitdiff