1 files changed, 391 insertions, 0 deletions
diff --git a/arch/arm/mach-omap1/dma.c b/arch/arm/mach-omap1/dma.c
new file mode 100644
index 00000000..3ef7d523
--- /dev/null
+++ b/arch/arm/mach-omap1/dma.c
@@ -0,0 +1,391 @@
+/*
+ * OMAP1/OMAP7xx - specific DMA driver
+ *
+ * Copyright (C) 2003 - 2008 Nokia Corporation
+ * Author: Juha Yrjölä <juha.yrjola@nokia.com>
+ * DMA channel linking for 1610 by Samuel Ortiz <samuel.ortiz@nokia.com>
+ * Graphics DMA and LCD DMA graphics tranformations
+ * by Imre Deak <imre.deak@nokia.com>
+ * 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) 2010 Texas Instruments Incorporated - http://www.ti.com/
+ * Converted DMA library into platform driver
+ *                   - G, Manjunath Kondaiah <manjugk@ti.com>
+ *
+ * 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/module.h>
+#include <linux/init.h>
+#include <linux/device.h>
+#include <linux/io.h>
+
+#include <plat/dma.h>
+#include <plat/tc.h>
+#include <plat/irqs.h>
+
+#define OMAP1_DMA_BASE			(0xfffed800)
+#define OMAP1_LOGICAL_DMA_CH_COUNT	17
+#define OMAP1_DMA_STRIDE		0x40
+
+static u32 errata;
+static u32 enable_1510_mode;
+static u8 dma_stride;
+static enum omap_reg_offsets dma_common_ch_start, dma_common_ch_end;
+
+static u16 reg_map[] = {
+	[GCR]		= 0x400,
+	[GSCR]		= 0x404,
+	[GRST1]		= 0x408,
+	[HW_ID]		= 0x442,
+	[PCH2_ID]	= 0x444,
+	[PCH0_ID]	= 0x446,
+	[PCH1_ID]	= 0x448,
+	[PCHG_ID]	= 0x44a,
+	[PCHD_ID]	= 0x44c,
+	[CAPS_0]	= 0x44e,
+	[CAPS_1]	= 0x452,
+	[CAPS_2]	= 0x456,
+	[CAPS_3]	= 0x458,
+	[CAPS_4]	= 0x45a,
+	[PCH2_SR]	= 0x460,
+	[PCH0_SR]	= 0x480,
+	[PCH1_SR]	= 0x482,
+	[PCHD_SR]	= 0x4c0,
+
+	/* Common Registers */
+	[CSDP]		= 0x00,
+	[CCR]		= 0x02,
+	[CICR]		= 0x04,
+	[CSR]		= 0x06,
+	[CEN]		= 0x10,
+	[CFN]		= 0x12,
+	[CSFI]		= 0x14,
+	[CSEI]		= 0x16,
+	[CPC]		= 0x18,	/* 15xx only */
+	[CSAC]		= 0x18,
+	[CDAC]		= 0x1a,
+	[CDEI]		= 0x1c,
+	[CDFI]		= 0x1e,
+	[CLNK_CTRL]	= 0x28,
+
+	/* Channel specific register offsets */
+	[CSSA]		= 0x08,
+	[CDSA]		= 0x0c,
+	[COLOR]		= 0x20,
+	[CCR2]		= 0x24,
+	[LCH_CTRL]	= 0x2a,
+};
+
+static struct resource res[] __initdata = {
+	[0] = {
+		.start	= OMAP1_DMA_BASE,
+		.end	= OMAP1_DMA_BASE + SZ_2K - 1,
+		.flags	= IORESOURCE_MEM,
+	},
+	[1] = {
+		.name   = "0",
+		.start  = INT_DMA_CH0_6,
+		.flags  = IORESOURCE_IRQ,
+	},
+	[2] = {
+		.name   = "1",
+		.start  = INT_DMA_CH1_7,
+		.flags  = IORESOURCE_IRQ,
+	},
+	[3] = {
+		.name   = "2",
+		.start  = INT_DMA_CH2_8,
+		.flags  = IORESOURCE_IRQ,
+	},
+	[4] = {
+		.name   = "3",
+		.start  = INT_DMA_CH3,
+		.flags  = IORESOURCE_IRQ,
+	},
+	[5] = {
+		.name   = "4",
+		.start  = INT_DMA_CH4,
+		.flags  = IORESOURCE_IRQ,
+	},
+	[6] = {
+		.name   = "5",
+		.start  = INT_DMA_CH5,
+		.flags  = IORESOURCE_IRQ,
+	},
+	/* Handled in lcd_dma.c */
+	[7] = {
+		.name   = "6",
+		.start  = INT_1610_DMA_CH6,
+		.flags  = IORESOURCE_IRQ,
+	},
+	/* irq's for omap16xx and omap7xx */
+	[8] = {
+		.name   = "7",
+		.start  = INT_1610_DMA_CH7,
+		.flags  = IORESOURCE_IRQ,
+	},
+	[9] = {
+		.name   = "8",
+		.start  = INT_1610_DMA_CH8,
+		.flags  = IORESOURCE_IRQ,
+	},
+	[10] = {
+		.name  = "9",
+		.start = INT_1610_DMA_CH9,
+		.flags = IORESOURCE_IRQ,
+	},
+	[11] = {
+		.name  = "10",
+		.start = INT_1610_DMA_CH10,
+		.flags = IORESOURCE_IRQ,
+	},
+	[12] = {
+		.name  = "11",
+		.start = INT_1610_DMA_CH11,
+		.flags = IORESOURCE_IRQ,
+	},
+	[13] = {
+		.name  = "12",
+		.start = INT_1610_DMA_CH12,
+		.flags = IORESOURCE_IRQ,
+	},
+	[14] = {
+		.name  = "13",
+		.start = INT_1610_DMA_CH13,
+		.flags = IORESOURCE_IRQ,
+	},
+	[15] = {
+		.name  = "14",
+		.start = INT_1610_DMA_CH14,
+		.flags = IORESOURCE_IRQ,
+	},
+	[16] = {
+		.name  = "15",
+		.start = INT_1610_DMA_CH15,
+		.flags = IORESOURCE_IRQ,
+	},
+	[17] = {
+		.name  = "16",
+		.start = INT_DMA_LCD,
+		.flags = IORESOURCE_IRQ,
+	},
+};
+
+static void __iomem *dma_base;
+static inline void dma_write(u32 val, int reg, int lch)
+{
+	u8  stride;
+	u32 offset;
+
+	stride = (reg >= dma_common_ch_start) ? dma_stride : 0;
+	offset = reg_map[reg] + (stride * lch);
+
+	__raw_writew(val, dma_base + offset);
+	if ((reg > CLNK_CTRL && reg < CCEN) ||
+			(reg > PCHD_ID && reg < CAPS_2)) {
+		u32 offset2 = reg_map[reg] + 2 + (stride * lch);
+		__raw_writew(val >> 16, dma_base + offset2);
+	}
+}
+
+static inline u32 dma_read(int reg, int lch)
+{
+	u8 stride;
+	u32 offset, val;
+
+	stride = (reg >= dma_common_ch_start) ? dma_stride : 0;
+	offset = reg_map[reg] + (stride * lch);
+
+	val = __raw_readw(dma_base + offset);
+	if ((reg > CLNK_CTRL && reg < CCEN) ||
+			(reg > PCHD_ID && reg < CAPS_2)) {
+		u16 upper;
+		u32 offset2 = reg_map[reg] + 2 + (stride * lch);
+		upper = __raw_readw(dma_base + offset2);
+		val |= (upper << 16);
+	}
+	return val;
+}
+
+static void omap1_clear_lch_regs(int lch)
+{
+	int i = dma_common_ch_start;
+
+	for (; i <= dma_common_ch_end; i += 1)
+		dma_write(0, i, lch);
+}
+
+static void omap1_clear_dma(int lch)
+{
+	u32 l;
+
+	l = dma_read(CCR, lch);
+	l &= ~OMAP_DMA_CCR_EN;
+	dma_write(l, CCR, lch);
+
+	/* Clear pending interrupts */
+	l = dma_read(CSR, lch);
+}
+
+static void omap1_show_dma_caps(void)
+{
+	if (enable_1510_mode) {
+		printk(KERN_INFO "DMA support for OMAP15xx initialized\n");
+	} else {
+		u16 w;
+		printk(KERN_INFO "OMAP DMA hardware version %d\n",
+							dma_read(HW_ID, 0));
+		printk(KERN_INFO "DMA capabilities: %08x:%08x:%04x:%04x:%04x\n",
+			dma_read(CAPS_0, 0), dma_read(CAPS_1, 0),
+			dma_read(CAPS_2, 0), dma_read(CAPS_3, 0),
+			dma_read(CAPS_4, 0));
+
+		/* Disable OMAP 3.0/3.1 compatibility mode. */
+		w = dma_read(GSCR, 0);
+		w |= 1 << 3;
+		dma_write(w, GSCR, 0);
+	}
+	return;
+}
+
+static u32 configure_dma_errata(void)
+{
+
+	/*
+	 * Erratum 3.2/3.3: sometimes 0 is returned if CSAC/CDAC is
+	 * read before the DMA controller finished disabling the channel.
+	 */
+	if (!cpu_is_omap15xx())
+		SET_DMA_ERRATA(DMA_ERRATA_3_3);
+
+	return errata;
+}
+
+static int __init omap1_system_dma_init(void)
+{
+	struct omap_system_dma_plat_info	*p;
+	struct omap_dma_dev_attr		*d;
+	struct platform_device			*pdev;
+	int ret;
+
+	pdev = platform_device_alloc("omap_dma_system", 0);
+	if (!pdev) {
+		pr_err("%s: Unable to device alloc for dma\n",
+			__func__);
+		return -ENOMEM;
+	}
+
+	dma_base = ioremap(res[0].start, resource_size(&res[0]));
+	if (!dma_base) {
+		pr_err("%s: Unable to ioremap\n", __func__);
+		ret = -ENODEV;
+		goto exit_device_put;
+	}
+
+	ret = platform_device_add_resources(pdev, res, ARRAY_SIZE(res));
+	if (ret) {
+		dev_err(&pdev->dev, "%s: Unable to add resources for %s%d\n",
+			__func__, pdev->name, pdev->id);
+		goto exit_device_put;
+	}
+
+	p = kzalloc(sizeof(struct omap_system_dma_plat_info), GFP_KERNEL);
+	if (!p) {
+		dev_err(&pdev->dev, "%s: Unable to allocate 'p' for %s\n",
+			__func__, pdev->name);
+		ret = -ENOMEM;
+		goto exit_device_del;
+	}
+
+	d = kzalloc(sizeof(struct omap_dma_dev_attr), GFP_KERNEL);
+	if (!d) {
+		dev_err(&pdev->dev, "%s: Unable to allocate 'd' for %s\n",
+			__func__, pdev->name);
+		ret = -ENOMEM;
+		goto exit_release_p;
+	}
+
+	d->lch_count		= OMAP1_LOGICAL_DMA_CH_COUNT;
+
+	/* Valid attributes for omap1 plus processors */
+	if (cpu_is_omap15xx())
+		d->dev_caps = ENABLE_1510_MODE;
+	enable_1510_mode = d->dev_caps & ENABLE_1510_MODE;
+
+	d->dev_caps		|= SRC_PORT;
+	d->dev_caps		|= DST_PORT;
+	d->dev_caps		|= SRC_INDEX;
+	d->dev_caps		|= DST_INDEX;
+	d->dev_caps		|= IS_BURST_ONLY4;
+	d->dev_caps		|= CLEAR_CSR_ON_READ;
+	d->dev_caps		|= IS_WORD_16;
+
+
+	d->chan = kzalloc(sizeof(struct omap_dma_lch) *
+					(d->lch_count), GFP_KERNEL);
+	if (!d->chan) {
+		dev_err(&pdev->dev, "%s: Memory allocation failed"
+					"for d->chan!!!\n", __func__);
+		goto exit_release_d;
+	}
+
+	if (cpu_is_omap15xx())
+		d->chan_count = 9;
+	else if (cpu_is_omap16xx() || cpu_is_omap7xx()) {
+		if (!(d->dev_caps & ENABLE_1510_MODE))
+			d->chan_count = 16;
+		else
+			d->chan_count = 9;
+	}
+
+	p->dma_attr = d;
+
+	p->show_dma_caps	= omap1_show_dma_caps;
+	p->clear_lch_regs	= omap1_clear_lch_regs;
+	p->clear_dma		= omap1_clear_dma;
+	p->dma_write		= dma_write;
+	p->dma_read		= dma_read;
+	p->disable_irq_lch	= NULL;
+
+	p->errata = configure_dma_errata();
+
+	ret = platform_device_add_data(pdev, p, sizeof(*p));
+	if (ret) {
+		dev_err(&pdev->dev, "%s: Unable to add resources for %s%d\n",
+			__func__, pdev->name, pdev->id);
+		goto exit_release_chan;
+	}
+
+	ret = platform_device_add(pdev);
+	if (ret) {
+		dev_err(&pdev->dev, "%s: Unable to add resources for %s%d\n",
+			__func__, pdev->name, pdev->id);
+		goto exit_release_chan;
+	}
+
+	dma_stride		= OMAP1_DMA_STRIDE;
+	dma_common_ch_start	= CPC;
+	dma_common_ch_end	= COLOR;
+
+	return ret;
+
+exit_release_chan:
+	kfree(d->chan);
+exit_release_d:
+	kfree(d);
+exit_release_p:
+	kfree(p);
+exit_device_del:
+	platform_device_del(pdev);
+exit_device_put:
+	platform_device_put(pdev);
+
+	return ret;
+}
+arch_initcall(omap1_system_dma_init);