[RFC 1/8] TILER-DMM: DMM-PAT driver for TI TILER
Sin, David
davidsin at ti.com
Tue Jul 27 15:05:11 EDT 2010
> -----Original Message-----
> From: Hiremath, Vaibhav
> Sent: Tuesday, July 27, 2010 1:38 PM
> To: Sin, David; linux-arm-kernel at lists.arm.linux.org.uk;
> linux-omap at vger.kernel.org; Tony Lindgren; Russell King
> Cc: Kanigeri, Hari; Ohad Ben-Cohen; Shilimkar, Santosh; Molnar, Lajos
> Subject: RE: [RFC 1/8] TILER-DMM: DMM-PAT driver for TI TILER
>
> > -----Original Message-----
> > From: Sin, David
> > Sent: Saturday, July 24, 2010 4:52 AM
> > To: linux-arm-kernel at lists.arm.linux.org.uk;
> linux-omap at vger.kernel.org;
> > Tony Lindgren; Russell King
> > Cc: Kanigeri, Hari; Ohad Ben-Cohen; Hiremath, Vaibhav;
> Shilimkar, Santosh;
> > Sin, David; Molnar, Lajos
> > Subject: [RFC 1/8] TILER-DMM: DMM-PAT driver for TI TILER
> >
> > This patch adds support for DMM-PAT initialization and programming.
> >
> [Hiremath, Vaibhav] Sorry for delayed response, always better
> late than never.
[dhs] Thanks for your comments, Vaibhav. I'll pull them in for RFC v2.
>
>
> > Signed-off-by: David Sin <davidsin at ti.com>
> > Signed-off-by: Lajos Molnar <molnar at ti.com>
> > ---
> > arch/arm/mach-omap2/include/mach/dmm.h | 128 ++++++++++++++++++++
> > drivers/media/video/tiler/dmm.c | 200
> > ++++++++++++++++++++++++++++++++
> > 2 files changed, 328 insertions(+), 0 deletions(-)
> > create mode 100644 arch/arm/mach-omap2/include/mach/dmm.h
> > create mode 100644 drivers/media/video/tiler/dmm.c
> >
> [Hiremath, Vaibhav] If I understand correctly, DMM stands for
> dynamic memory manager. Is it something which can only be
> used with Video devices? Any specific reason why this is part
> of drivers/media/video/ directory,
[dhs] Any device can use TILER memory, but there is a big advantage, performance-wise, for 2-Dimensional macro block based buffers. This HW is intended for image/video hardware accelerators (e.g. OMAP4 IVA-HD). Plus there's the added advantage of doing zero-copy flips and rotations for the OMAP display and image sub-systems.
>
>
> > diff --git a/arch/arm/mach-omap2/include/mach/dmm.h b/arch/arm/mach-
> > omap2/include/mach/dmm.h
> > new file mode 100644
> > index 0000000..68b798a
> > --- /dev/null
> > +++ b/arch/arm/mach-omap2/include/mach/dmm.h
> > @@ -0,0 +1,128 @@
> > +/*
> > + * dmm.h
> > + *
> > + * DMM driver support functions for TI DMM-TILER hardware block.
> > + *
> > + * Author: David Sin <davidsin at ti.com>
> > + *
> > + * Copyright (C) 2009-2010 Texas Instruments, Inc.
> > + *
> > + * This package is free software; you can redistribute it
> and/or modify
> > + * it under the terms of the GNU General Public License
> version 2 as
> > + * published by the Free Software Foundation.
> > + *
> > + * THIS PACKAGE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
> > + * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
> > + * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A
> PARTICULAR PURPOSE.
> > + */
> > +
> > +#ifndef DMM_H
> > +#define DMM_H
> > +
> > +#define DMM_BASE 0x4E000000
> > +#define DMM_SIZE 0x800
> [Hiremath, Vaibhav] Unused definition (DMM_SIZE), do we required it?
[dhs] It's currently being used in dmm.c to indicate how much to ioremap.
>
> > +
> > +#define DMM_REVISION 0x000
> > +#define DMM_HWINFO 0x004
> > +#define DMM_LISA_HWINFO 0x008
> > +#define DMM_DMM_SYSCONFIG 0x010
> > +#define DMM_LISA_LOCK 0x01C
> > +#define DMM_LISA_MAP__0 0x040
> > +#define DMM_LISA_MAP__1 0x044
> > +#define DMM_TILER_HWINFO 0x208
> > +#define DMM_TILER_OR__0 0x220
> > +#define DMM_TILER_OR__1 0x224
> > +#define DMM_PAT_HWINFO 0x408
> > +#define DMM_PAT_GEOMETRY 0x40C
> > +#define DMM_PAT_CONFIG 0x410
> > +#define DMM_PAT_VIEW__0 0x420
> > +#define DMM_PAT_VIEW__1 0x424
> > +#define DMM_PAT_VIEW_MAP__0 0x440
> > +#define DMM_PAT_VIEW_MAP_BASE 0x460
> > +#define DMM_PAT_IRQ_EOI 0x478
> > +#define DMM_PAT_IRQSTATUS_RAW 0x480
> > +#define DMM_PAT_IRQSTATUS 0x490
> > +#define DMM_PAT_IRQENABLE_SET 0x4A0
> > +#define DMM_PAT_IRQENABLE_CLR 0x4B0
> > +#define DMM_PAT_STATUS__0 0x4C0
> > +#define DMM_PAT_STATUS__1 0x4C4
> > +#define DMM_PAT_STATUS__2 0x4C8
> > +#define DMM_PAT_STATUS__3 0x4CC
> > +#define DMM_PAT_DESCR__0 0x500
> > +#define DMM_PAT_AREA__0 0x504
> > +#define DMM_PAT_CTRL__0 0x508
> > +#define DMM_PAT_DATA__0 0x50C
> [Hiremath, Vaibhav] Not sure whether somebody has given same
> comment or not, any specific reason behind double _ here?
[dhs] Yes -- this comment has been made already. I'm using the same names defined in the TRM. However, it can be changed.
>
> > +#define DMM_PEG_HWINFO 0x608
> > +#define DMM_PEG_PRIO 0x620
> > +#define DMM_PEG_PRIO_PAT 0x640
> > +
> > +/**
> > + * PAT refill programming mode.
> > + */
> > +enum pat_mode {
> > + MANUAL,
> > + AUTO
> > +};
> > +
> > +/**
> > + * Area definition for DMM physical address translator.
> > + */
> > +struct pat_area {
> > + s32 x0:8;
> > + s32 y0:8;
> > + s32 x1:8;
> > + s32 y1:8;
> > +};
> > +
> > +/**
> > + * DMM physical address translator control.
> > + */
> > +struct pat_ctrl {
> > + s32 start:4;
> > + s32 dir:4;
> > + s32 lut_id:8;
> > + s32 sync:12;
> > + s32 ini:4;
> > +};
> > +
> > +/**
> > + * PAT descriptor.
> > + */
> > +struct pat {
> > + struct pat *next;
> > + struct pat_area area;
> > + struct pat_ctrl ctrl;
> > + u32 data;
> > +};
> > +
> > +/**
> > + * DMM device data
> > + */
> > +struct dmm {
> > + void __iomem *base;
> > +};
> > +
> > +/**
> > + * Create and initialize the physical address translator.
> > + * @param id PAT id
> > + * @return pointer to device data
> > + */
> > +struct dmm *dmm_pat_init(u32 id);
> > +
> > +/**
> > + * Program the physical address translator.
> > + * @param dmm Device data
> > + * @param desc PAT descriptor
> > + * @param mode programming mode
> > + * @return an error status.
> > + */
> > +s32 dmm_pat_refill(struct dmm *dmm, struct pat *desc, enum
> pat_mode mode);
> > +
> > +/**
> > + * Clean up the physical address translator.
> > + * @param dmm Device data
> > + * @return an error status.
> > + */
> > +void dmm_pat_release(struct dmm *dmm);
> > +
> > +#endif
> > diff --git a/drivers/media/video/tiler/dmm.c
> > b/drivers/media/video/tiler/dmm.c
> > new file mode 100644
> > index 0000000..e715936
> > --- /dev/null
> > +++ b/drivers/media/video/tiler/dmm.c
> > @@ -0,0 +1,200 @@
> > +/*
> > + * dmm.c
> > + *
> > + * DMM driver support functions for TI OMAP processors.
> > + *
> > + * Authors: David Sin <davidsin at ti.com>
> > + * Lajos Molnar <molnar at ti.com>
> > + *
> > + * Copyright (C) 2009-2010 Texas Instruments, Inc.
> > + *
> > + * This package is free software; you can redistribute it
> and/or modify
> > + * it under the terms of the GNU General Public License
> version 2 as
> > + * published by the Free Software Foundation.
> > + *
> > + * THIS PACKAGE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
> > + * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
> > + * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A
> PARTICULAR PURPOSE.
> > + */
> > +
> > +#include <linux/init.h>
> > +#include <linux/module.h>
> > +#include <linux/platform_device.h> /* platform_device() */
> > +#include <linux/io.h> /* ioremap() */
> [Hiremath, Vaibhav] No need to specify comments here actually?
[dhs] This can be removed -- thanks.
>
> > +#include <linux/errno.h>
> > +#include <linux/slab.h>
> > +
> > +#include <mach/dmm.h>
> > +
> > +#define MASK(msb, lsb) (((1 << ((msb) + 1 - (lsb))) - 1) << (lsb))
> > +#define SET_FLD(reg, msb, lsb, val) \
> > +(((reg) & ~MASK((msb), (lsb))) | (((val) << (lsb)) &
> MASK((msb), (lsb))))
> > +
> > +static struct platform_driver dmm_driver_ldm = {
> > + .driver = {
> > + .owner = THIS_MODULE,
> > + .name = "dmm",
> > + },
> > + .probe = NULL,
> > + .shutdown = NULL,
> > + .remove = NULL,
> > +};
> > +
> > +s32 dmm_pat_refill(struct dmm *dmm, struct pat *pd, enum
> pat_mode mode)
> > +{
> > + void __iomem *r;
> > + u32 v;
> > +
> > + /* Only manual refill supported */
> > + if (mode != MANUAL)
> > + return -EFAULT;
> > +
> > + /* Check that the DMM_PAT_STATUS register has not
> reported an error */
> > + r = dmm->base + DMM_PAT_STATUS__0;
> > + v = __raw_readl(r);
> > + if (WARN(v & 0xFC00, KERN_ERR "dmm_pat_refill() error.\n"))
> > + return -EIO;
> > +
> > + /* Set "next" register to NULL */
> > + r = dmm->base + DMM_PAT_DESCR__0;
> > + v = __raw_readl(r);
> > + v = SET_FLD(v, 31, 4, (u32) NULL);
> > + __raw_writel(v, r);
> > +
> > + /* Set area to be refilled */
> > + r = dmm->base + DMM_PAT_AREA__0;
> > + v = __raw_readl(r);
> > + v = SET_FLD(v, 30, 24, pd->area.y1);
> > + v = SET_FLD(v, 23, 16, pd->area.x1);
> > + v = SET_FLD(v, 14, 8, pd->area.y0);
> > + v = SET_FLD(v, 7, 0, pd->area.x0);
> > + __raw_writel(v, r);
> > + wmb();
> > +
> > + /* First, clear the DMM_PAT_IRQSTATUS register */
> > + r = dmm->base + DMM_PAT_IRQSTATUS;
> > + __raw_writel(0xFFFFFFFF, r);
> > + wmb();
> > +
> > + r = dmm->base + DMM_PAT_IRQSTATUS_RAW;
> > + while (__raw_readl(r) != 0)
> > + ;
> > +
> [Hiremath, Vaibhav] Get rid of infinite loop??
[dhs] Yes -- this comment has already been posted, thanks.
>
> > + /* Fill data register */
> > + r = dmm->base + DMM_PAT_DATA__0;
> > + v = __raw_readl(r);
> > +
> > + v = SET_FLD(v, 31, 4, pd->data >> 4);
> > + __raw_writel(v, r);
> > + wmb();
> > +
> > + /* Read back PAT_DATA__0 to see if write was successful */
> > + while (__raw_readl(r) != pd->data)
> > + ;
> > +
> > + r = dmm->base + DMM_PAT_CTRL__0;
> > + v = __raw_readl(r);
> > + v = SET_FLD(v, 31, 28, pd->ctrl.ini);
> > + v = SET_FLD(v, 16, 16, pd->ctrl.sync);
> > + v = SET_FLD(v, 9, 8, pd->ctrl.lut_id);
> > + v = SET_FLD(v, 6, 4, pd->ctrl.dir);
> > + v = SET_FLD(v, 0, 0, pd->ctrl.start);
> > + __raw_writel(v, r);
> > + wmb();
> > +
> > + /* Check if PAT_IRQSTATUS_RAW is set after the PAT has
> been refilled
> > */
> > + r = dmm->base + DMM_PAT_IRQSTATUS_RAW;
> > + while ((__raw_readl(r) & 0x3) != 0x3)
> > + ;
> > +
> > + /* Again, clear the DMM_PAT_IRQSTATUS register */
> > + r = dmm->base + DMM_PAT_IRQSTATUS;
> > + __raw_writel(0xFFFFFFFF, r);
> > + wmb();
> > +
> > + r = dmm->base + DMM_PAT_IRQSTATUS_RAW;
> > + while (__raw_readl(r) != 0)
> > + ;
> [Hiremath, Vaibhav] Do you want to wait on whole register
> value or one specific bit here?
[dhs] Not whole register, but not one bit either. I'll revisit this.
>
> > +
> > + /* Again, set "next" register to NULL to clear any PAT
> STATUS errors
> > */
> > + r = dmm->base + DMM_PAT_DESCR__0;
> > + v = __raw_readl(r);
> > + v = SET_FLD(v, 31, 4, (u32) NULL);
> [Hiremath, Vaibhav] Why NULL, can't pass directly 0 here?
[dhs] This value should be the pointer to the next PAT descriptor. In this case, it's NULL, but '0' should work too.
>
> Thanks,
> Vaibhav
>
> > + __raw_writel(v, r);
> > +
> > + /*
> > + * Now, check that the DMM_PAT_STATUS register
> > + * has not reported an error before exiting.
> > + */
> > + r = dmm->base + DMM_PAT_STATUS__0;
> > + v = __raw_readl(r);
> > + if (WARN(v & 0xFC00, KERN_ERR "dmm_pat_refill() error.\n"))
> > + return -EIO;
> > +
> > + return 0;
> > +}
> > +EXPORT_SYMBOL(dmm_pat_refill);
> > +
> > +struct dmm *dmm_pat_init(u32 id)
> > +{
> > + u32 base;
> > + struct dmm *dmm;
> > + switch (id) {
> > + case 0:
> > + /* only support id 0 for now */
> > + base = DMM_BASE;
> > + break;
> > + default:
> > + return NULL;
> > + }
> > +
> > + dmm = kzalloc(sizeof(*dmm), GFP_KERNEL);
> > + if (!dmm)
> > + return NULL;
> > +
> > + dmm->base = ioremap(base, DMM_SIZE);
> > + if (!dmm->base) {
> > + kfree(dmm);
> > + return NULL;
> > + }
> > +
> > + __raw_writel(0x88888888, dmm->base + DMM_PAT_VIEW__0);
> > + __raw_writel(0x88888888, dmm->base + DMM_PAT_VIEW__1);
> > + __raw_writel(0x80808080, dmm->base + DMM_PAT_VIEW_MAP__0);
> > + __raw_writel(0x80000000, dmm->base + DMM_PAT_VIEW_MAP_BASE);
> > + __raw_writel(0x88888888, dmm->base + DMM_TILER_OR__0);
> > + __raw_writel(0x88888888, dmm->base + DMM_TILER_OR__1);
> > +
> > + return dmm;
> > +}
> > +EXPORT_SYMBOL(dmm_pat_init);
> > +
> > +/**
> > + * Clean up the physical address translator.
> > + * @param dmm Device data
> > + * @return an error status.
> > + */
> > +void dmm_pat_release(struct dmm *dmm)
> > +{
> > + if (dmm) {
> > + iounmap(dmm->base);
> > + kfree(dmm);
> > + }
> > +}
> > +EXPORT_SYMBOL(dmm_pat_release);
> > +
> > +static s32 __init dmm_init(void)
> > +{
> > + return platform_driver_register(&dmm_driver_ldm);
> > +}
> > +
> > +static void __exit dmm_exit(void)
> > +{
> > + platform_driver_unregister(&dmm_driver_ldm);
> > +}
> > +
> > +MODULE_LICENSE("GPL v2");
> > +MODULE_AUTHOR("davidsin at ti.com");
> > +MODULE_AUTHOR("molnar at ti.com");
> > +module_init(dmm_init);
> > +module_exit(dmm_exit);
> > --
> > 1.6.3.3
>
>
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