This patch converts omap2/3/4 dma driver into platform
devices through using omap hwmod, omap device and runtime pm
frameworks.
Signed-off-by: Manjunatha GK <manjugk@xxxxxx>
Cc: Benoit Cousson <b-cousson@xxxxxx>
Cc: Kevin Hilman <khilman@xxxxxxxxxxxxxxxxxxx>
Cc: Santosh Shilimkar <santosh.shilimkar@xxxxxx>
---
arch/arm/mach-omap2/dma.c | 134 ++++++++++++++++++++++++++++++++
arch/arm/mach-omap2/include/mach/dma.h | 80 +++++++++++++++++++
2 files changed, 214 insertions(+), 0 deletions(-)
create mode 100644 arch/arm/mach-omap2/dma.c
create mode 100644 arch/arm/mach-omap2/include/mach/dma.h
diff --git a/arch/arm/mach-omap2/dma.c b/arch/arm/mach-omap2/dma.c
new file mode 100644
index 0000000..f369bee
--- /dev/null
+++ b/arch/arm/mach-omap2/dma.c
@@ -0,0 +1,134 @@
+/*
+ * dma.c - OMAP2 specific DMA code
+ *
+ * Copyright (C) 2003 - 2008 Nokia Corporation
+ * Author: Juha Yrjölä <juha.yrjola@xxxxxxxxx>
+ * DMA channel linking for 1610 by Samuel Ortiz <samuel.ortiz@xxxxxxxxx>
+ * Graphics DMA and LCD DMA graphics tranformations
+ * by Imre Deak <imre.deak@xxxxxxxxx>
+ * OMAP2/3 support Copyright (C) 2004-2007 Texas Instruments, Inc.
+ * Some functions based on earlier dma-omap.c Copyright (C) 2001 RidgeRun, Inc.
+ *
+ * Copyright (C) 2009 Texas Instruments
+ * Added OMAP4 support - Santosh Shilimkar <santosh.shilimkar@xxxxxx>
+ *
+ * Copyright (C) 2010 Texas Instruments, Inc.
+ * Converted DMA library into platform driver by Manjunatha GK <manjugk@xxxxxx>
+ *
+ * This program 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.
+ */
+
+#include <linux/err.h>
+#include <linux/slab.h>
+#include <linux/pm_runtime.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/spinlock.h>
+#include <linux/errno.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/device.h>
+
+#include <plat/irqs.h>
+#include <plat/omap_hwmod.h>
+#include <plat/omap_device.h>
+#include <plat/dma.h>
+
+#define dma_read(reg) \
+({ \
+ u32 __val; \
+ __val = __raw_readl(dma_base + OMAP_DMA4_##reg); \
+ __val; \
+})
+
+#define dma_write(val, reg) \
+({ \
+ __raw_writel((val), dma_base + OMAP_DMA4_##reg); \
+})
+
+static struct omap_dma_dev_attr *d;
+static void __iomem *dma_base;
+static struct omap_system_dma_plat_info *omap2_pdata;
+static int dma_caps0_status;
+
+static struct omap_device_pm_latency omap2_dma_latency[] = {
+ {
+ .deactivate_func = omap_device_idle_hwmods,
+ .activate_func = omap_device_enable_hwmods,
+ .flags = OMAP_DEVICE_LATENCY_AUTO_ADJUST,
+ },
+};
+
+/* One time initializations */
+static int __init omap2_system_dma_init_dev(struct omap_hwmod *oh, void *user)
+{
+ struct omap_device *od;
+ struct omap_system_dma_plat_info *pdata;
+ struct resource *mem;
+ char *name = "dma";
+
+ pdata = kzalloc(sizeof(struct omap_system_dma_plat_info), GFP_KERNEL);
+ if (!pdata) {
+ pr_err("%s: Unable to allocate pdata for %s:%s\n",
+ __func__, name, oh->name);
+ return -ENOMEM;
+ }
+
+ pdata->dma_attr = (struct omap_dma_dev_attr *)oh->dev_attr;
+
+ od = omap_device_build(name, 0, oh, pdata, sizeof(*pdata),
+ omap2_dma_latency, ARRAY_SIZE(omap2_dma_latency), 0);
+
+ if (IS_ERR(od)) {
+ pr_err("%s: Cant build omap_device for %s:%s.\n",
+ __func__, name, oh->name);
+ kfree(pdata);
+ return 0;
+ }
+
+ mem = platform_get_resource(&od->pdev, IORESOURCE_MEM, 0);
+ if (!mem) {
+ dev_err(&od->pdev.dev, "%s: no mem resource\n", __func__);
+ return -EINVAL;
+ }
+
+ dma_base = ioremap(mem->start, resource_size(mem));
+ if (!dma_base) {
+ dev_err(&od->pdev.dev, "%s: ioremap fail\n", __func__);
+ return -ENOMEM;
+ }
+
+ /* Get DMA device attributes from hwmod data base */
+ d = (struct omap_dma_dev_attr *)oh->dev_attr;
+
+ /* OMAP2 Plus: physical and logical channel count is same */
+ d->chan_count = d->lch_count;
+
+ d->chan = kzalloc(sizeof(struct omap_dma_lch) *
+ (d->lch_count), GFP_KERNEL);
+
+ if (!d->chan) {
+ dev_err(&od->pdev.dev, "%s: kzalloc fail\n", __func__);
+ return -ENOMEM;
+ }
+
+ omap2_pdata = pdata;
+ dma_caps0_status = dma_read(CAPS_0);
+
+ return 0;
+}
+
+static int __init omap2_system_dma_init(void)
+{
+ int ret;
+
+ ret = omap_hwmod_for_each_by_class("dma",
+ omap2_system_dma_init_dev, NULL);
+
+ return ret;
+}
+arch_initcall(omap2_system_dma_init);
diff --git a/arch/arm/mach-omap2/include/mach/dma.h b/arch/arm/mach-omap2/include/mach/dma.h
new file mode 100644
index 0000000..3eca7d8
--- /dev/null
+++ b/arch/arm/mach-omap2/include/mach/dma.h
@@ -0,0 +1,80 @@
+/*
+ * OMAP DMA controller register offsets.
+ *
+ * Copyright (C) 2003 Nokia Corporation
+ * Author: Juha Yrjölä <juha.yrjola@xxxxxxxxx>
+ *
+ * Copyright (C) 2009 Texas Instruments
+ * Added OMAP4 support - Santosh Shilimkar <santosh.shilimkar@xxxxxx>
+ *
+ * Copyright (C) 2010 Texas Instruments
+ * Converted DMA library into platform driver by Manjunatha GK <manjugk@xxxxxx>
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#ifndef __ASM_ARCH_OMAP2_DMA_H
+#define __ASM_ARCH_OMAP2_DMA_H
+
+/* OMAP2 Plus register offset's */
+#define OMAP_DMA4_REVISION 0x00
+#define OMAP_DMA4_GCR 0x78
+#define OMAP_DMA4_IRQSTATUS_L0 0x08
+#define OMAP_DMA4_IRQSTATUS_L1 0x0c
+#define OMAP_DMA4_IRQSTATUS_L2 0x10
+#define OMAP_DMA4_IRQSTATUS_L3 0x14
+#define OMAP_DMA4_IRQENABLE_L0 0x18
+#define OMAP_DMA4_IRQENABLE_L1 0x1c
+#define OMAP_DMA4_IRQENABLE_L2 0x20
+#define OMAP_DMA4_IRQENABLE_L3 0x24
+#define OMAP_DMA4_SYSSTATUS 0x28
+#define OMAP_DMA4_OCP_SYSCONFIG 0x2c
+#define OMAP_DMA4_CAPS_0 0x64
+#define OMAP_DMA4_CAPS_2 0x6c
+#define OMAP_DMA4_CAPS_3 0x70
+#define OMAP_DMA4_CAPS_4 0x74
+
+/* Should be part of hwmod data base ? */
+#define OMAP_DMA4_LOGICAL_DMA_CH_COUNT 32 /* REVISIT: Is this 32 + 2? */
+
+/* Common channel specific registers for omap2 */
+#define OMAP_DMA4_CH_BASE(n) (0x60 * (n) + 0x80)
+#define OMAP_DMA4_CCR(n) (0x60 * (n) + 0x80)
+#define OMAP_DMA4_CLNK_CTRL(n) (0x60 * (n) + 0x84)
+#define OMAP_DMA4_CICR(n) (0x60 * (n) + 0x88)
+#define OMAP_DMA4_CSR(n) (0x60 * (n) + 0x8c)
+#define OMAP_DMA4_CSDP(n) (0x60 * (n) + 0x90)
+#define OMAP_DMA4_CEN(n) (0x60 * (n) + 0x94)
+#define OMAP_DMA4_CFN(n) (0x60 * (n) + 0x98)
+#define OMAP_DMA4_CSEI(n) (0x60 * (n) + 0xa4)
+#define OMAP_DMA4_CSFI(n) (0x60 * (n) + 0xa8)
+#define OMAP_DMA4_CDEI(n) (0x60 * (n) + 0xac)
+#define OMAP_DMA4_CDFI(n) (0x60 * (n) + 0xb0)
+#define OMAP_DMA4_CSAC(n) (0x60 * (n) + 0xb4)
+#define OMAP_DMA4_CDAC(n) (0x60 * (n) + 0xb8)
+
+/* Channel specific registers only on omap2 */
+#define OMAP_DMA4_CSSA(n) (0x60 * (n) + 0x9c)
+#define OMAP_DMA4_CDSA(n) (0x60 * (n) + 0xa0)
+#define OMAP_DMA4_CCEN(n) (0x60 * (n) + 0xbc)
+#define OMAP_DMA4_CCFN(n) (0x60 * (n) + 0xc0)
+#define OMAP_DMA4_COLOR(n) (0x60 * (n) + 0xc4)
+
+/* Additional registers available on OMAP4 */
+#define OMAP_DMA4_CDP(n) (0x60 * (n) + 0xd0)
+#define OMAP_DMA4_CNDP(n) (0x60 * (n) + 0xd4)
+#define OMAP_DMA4_CCDN(n) (0x60 * (n) + 0xd8)
+
+#endif /* __ASM_ARCH_OMAP2_DMA_H */
--
1.7.0.4
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