[PATCH] Xilinx : Framebuffer Driver: Add PLB support (non-DCR)
John Linn
John.Linn at xilinx.com
Fri Apr 10 00:34:39 EST 2009
> -----Original Message-----
> From: Josh Boyer [mailto:jwboyer at linux.vnet.ibm.com]
> Sent: Thursday, April 09, 2009 6:47 AM
> To: John Linn
> Cc: grant.likely at secretlab.ca; linuxppc-dev at ozlabs.org;
> linux-fbdev-devel at lists.sourceforge.net;
> akonovalov at ru.mvista.com; adaplas at gmail.com; Suneel; Suneel Garapati
> Subject: Re: [PATCH] Xilinx : Framebuffer Driver: Add PLB
> support (non-DCR)
>
> On Wed, Apr 08, 2009 at 03:11:25PM -0600, John Linn wrote:
> >From: Suneel <[mailto:suneel.garapati at xilinx.com]>
> >
> >Added support for the new xps tft controller.
> >
> >The new core has PLB interface support in addition to existing
> >DCR interface.
> >
> >The driver has been modified to support this new core which
> >can be connected on PLB or DCR bus.
> >
> >Signed-off-by: Suneel <suneelg at xilinx.com>
> >Signed-off-by: John Linn <john.linn at xilinx.com>
> >---
> > drivers/video/xilinxfb.c | 227
> ++++++++++++++++++++++++++++++++--------------
> > 1 files changed, 160 insertions(+), 67 deletions(-)
> >
> >diff --git a/drivers/video/xilinxfb.c b/drivers/video/xilinxfb.c
> >index a82c530..a28a834 100644
> >--- a/drivers/video/xilinxfb.c
> >+++ b/drivers/video/xilinxfb.c
> >@@ -1,17 +1,24 @@
> > /*
> >- * xilinxfb.c
> > *
> >- * Xilinx TFT LCD frame buffer driver
> >+ * Xilinx TFT frame buffer driver
> > *
> > * Author: MontaVista Software, Inc.
> > * source at 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
> >- * kind, whether express or implied.
> >+ * This program is free software; you can redistribute it
> >+ * and/or modify it under the terms of the GNU General Public
> >+ * License as published by the Free Software Foundation;
> >+ * either version 2 of the License, or (at your option) any
> >+ * later version.
> >+ *
> >+ * You should have received a copy of the GNU General Public
> >+ * License along with this program; if not, write to the Free
> >+ * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA
> >+ * 02139, USA.
> > */
>
> What Stephen said.
Grant commented, I'll respin it after other comments to leave that
alone.
>
> > #define NUM_REGS 2
> > #define REG_FB_ADDR 0
> >@@ -112,6 +123,11 @@ struct xilinxfb_drvdata {
> >
> > struct fb_info info; /* FB driver info record */
> >
> >+ u32 regs_phys; /* phys. address of the control
> >+ registers */
>
> Is this driver usable on the 440 based Xilinx devices? If
> so, is it possible
> to have the physical address of the registers above 4GiB, so
> is common with
> almost all the I/O on the other 440 boards?
>
It is used on the 440. As Roderick said,
devices are mapped using the 32 bits of address in the Xilinx tools so
it would be best to stay below 4 Gig to my knowledge.
> >+ void __iomem *regs; /* virt. address of the control
> >+ registers */
> >+
> > dcr_host_t dcr_host;
> > unsigned int dcr_start;
> > unsigned int dcr_len;
> >@@ -120,6 +136,10 @@ struct xilinxfb_drvdata {
> > dma_addr_t fb_phys; /* phys. address of the
> frame buffer */
> > int fb_alloced; /* Flag, was the fb
> memory alloced? */
> >
> >+ u32 dcr_splb_slave_if;
> >+ /* True, if control interface is
> >+ connected through plb */
> >+
>
> Do you need a full 32-bit variable for a simple boolean? It
> might be best for
> structure alignment, but you might want to look at using a
> flags variable or
> something that could be extended with feature bits in a single word.
It could be a flag I think. This was easy as it mapped to the device
tree property.
>
> > u32 reg_ctrl_default;
> >
> > u32 pseudo_palette[PALETTE_ENTRIES_NO];
> >@@ -130,14 +150,19 @@ struct xilinxfb_drvdata {
> > 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) \
> >- dcr_write(driverdata->dcr_host, offset, val)
> >+static void xilinx_fb_out_be32(struct xilinxfb_drvdata
> *drvdata, u32 offset,
> >+ u32 val)
> >+{
> >+ if (drvdata->dcr_splb_slave_if == 1)
> >+ 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,
> >@@ -175,7 +200,8 @@ xilinx_fb_blank(int blank_mode, struct
> fb_info *fbi)
> > switch (blank_mode) {
> > case FB_BLANK_UNBLANK:
> > /* turn on panel */
> >- xilinx_fb_out_be32(drvdata, REG_CTRL,
> drvdata->reg_ctrl_default);
> >+ xilinx_fb_out_be32(drvdata, REG_CTRL,
> >+ drvdata->reg_ctrl_default);
> > break;
> >
> > case FB_BLANK_NORMAL:
> >@@ -191,8 +217,7 @@ xilinx_fb_blank(int blank_mode, struct
> fb_info *fbi)
> > return 0; /* success */
> > }
> >
> >-static struct fb_ops xilinxfb_ops =
> >-{
> >+static struct fb_ops xilinxfb_ops = {
> > .owner = THIS_MODULE,
> > .fb_setcolreg = xilinx_fb_setcolreg,
> > .fb_blank = xilinx_fb_blank,
> >@@ -205,25 +230,35 @@ static struct fb_ops xilinxfb_ops =
> > * Bus independent setup/teardown
> > */
> >
> >-static int xilinxfb_assign(struct device *dev, dcr_host_t dcr_host,
> >- unsigned int dcr_start, unsigned int dcr_len,
> >+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;
> >+ if (drvdata->dcr_splb_slave_if) {
> >+ /*
> >+ * 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;
> >+ }
> > }
> >- dev_set_drvdata(dev, drvdata);
> >-
> >- drvdata->dcr_start = dcr_start;
> >- drvdata->dcr_len = dcr_len;
> >- drvdata->dcr_host = dcr_host;
> >
> > /* Allocate the framebuffer memory */
> > if (pdata->fb_phys) {
> >@@ -238,7 +273,10 @@ static int xilinxfb_assign(struct
> device *dev, dcr_host_t dcr_host,
> > if (!drvdata->fb_virt) {
> > dev_err(dev, "Could not allocate frame buffer
> memory\n");
> > rc = -ENOMEM;
> >- goto err_region;
> >+ if (drvdata->dcr_splb_slave_if)
> >+ goto err_fbmem;
> >+ else
> >+ goto err_region;
> > }
> >
> > /* Clear (turn to black) the framebuffer */
> >@@ -251,7 +289,8 @@ static int xilinxfb_assign(struct device
> *dev, dcr_host_t dcr_host,
> > 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;
> >@@ -287,9 +326,14 @@ static int xilinxfb_assign(struct
> device *dev, dcr_host_t dcr_host,
> > goto err_regfb;
> > }
> >
> >+ if (drvdata->dcr_splb_slave_if) {
> >+ /* 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, "fb: phys=%p, virt=%p, size=%x\n",
> >- (void*)drvdata->fb_phys, drvdata->fb_virt, fbsize);
> >+ (void *)drvdata->fb_phys, drvdata->fb_virt, fbsize);
> >
> > return 0; /* success */
> >
> >@@ -300,9 +344,20 @@ err_cmap:
> > 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:
> >+ if (drvdata->dcr_splb_slave_if)
> >+ iounmap(drvdata->regs);
> >+
> >+err_map:
> >+ if (drvdata->dcr_splb_slave_if)
> >+ release_mem_region(physaddr, 8);
> >+
> > err_region:
> > kfree(drvdata);
> > dev_set_drvdata(dev, NULL);
> >@@ -325,11 +380,18 @@ static int xilinxfb_release(struct device *dev)
> > 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);
> >
> >- dcr_unmap(drvdata->dcr_host, drvdata->dcr_len);
> >+ /* Release the resources, as allocated based on interface */
> >+ if (drvdata->dcr_splb_slave_if) {
> >+ 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);
> >@@ -341,27 +403,54 @@ static int xilinxfb_release(struct device *dev)
> > * OF bus binding
> > */
> >
> >-#if defined(CONFIG_OF)
> > static int __devinit
> > xilinxfb_of_probe(struct of_device *op, const struct
> of_device_id *match)
> > {
> > const u32 *prop;
> >+ u32 *p;
> >+ u32 tft_access;
> > struct xilinxfb_platform_data pdata;
> >+ struct resource res;
> > int size, rc;
> >- int start, len;
> >+ 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);
> >
> >- 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;
> >+ /*
> >+ * 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);
> >@@ -385,7 +474,26 @@ xilinxfb_of_probe(struct of_device *op,
> const struct of_device_id *match)
> > if (of_find_property(op->node, "rotate-display", NULL))
> > pdata.rotate_screen = 1;
> >
> >- return xilinxfb_assign(&op->dev, dcr_host, start, len, &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);
> >+
> >+ /* Store the tft_access value into the driverdata
> structure member */
> >+ drvdata->dcr_splb_slave_if = tft_access;
> >+
> >+ /* Arguments are passed based on the interface */
> >+ if (drvdata->dcr_splb_slave_if == 1) {
> >+ 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)
> >@@ -395,6 +503,7 @@ 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", },
> > {},
> >@@ -412,22 +521,6 @@ static struct of_platform_driver
> xilinxfb_of_driver = {
> > },
> > };
> >
> >-/* 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
> >@@ -436,18 +529,18 @@ static inline void __exit
> xilinxfb_of_unregister(void) { }
> > static int __init
> > xilinxfb_init(void)
> > {
> >- return xilinxfb_of_register();
> >+ return of_register_platform_driver(&xilinxfb_of_driver);
> > }
> >
> > static void __exit
> > xilinxfb_cleanup(void)
> > {
> >- xilinxfb_of_unregister();
> >+ of_unregister_platform_driver(&xilinxfb_of_driver);
> > }
> >
> > module_init(xilinxfb_init);
> > module_exit(xilinxfb_cleanup);
> >
> >-MODULE_AUTHOR("MontaVista Software, Inc. <source at mvista.com>");
> >-MODULE_DESCRIPTION(DRIVER_DESCRIPTION);
> >+MODULE_AUTHOR("Xilinx Inc.");
> >+MODULE_DESCRIPTION("Xilinx TFT frame buffer driver");
> > MODULE_LICENSE("GPL");
>
> You changed the MODULE_AUTHOR here. Is that really valid?
>
> >--
> >1.6.2.1
> >
> >
> >This email and any attachments are intended for the sole use
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> or any attachments. Delete this email message and any
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> >
>
> This seems rather odd to be on a patch submission....
>
Yea I know, trying to get corporate IT not do stuff like that is a full
time job sometimes. Sorry about that.
Thanks for the comments.
-- John
> josh
>
>
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