- 根目录:
- arch
- arm
- mach-omap1
- dma.c
/*
* 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 <linux/dma-mapping.h>
#include <linux/omap-dma.h>
#include <mach/tc.h>
#include <mach/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 const struct platform_device_info omap_dma_dev_info = {
.name = "omap-dma-engine",
.id = -1,
.dma_mask = DMA_BIT_MASK(32),
};
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, *dma_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_iounmap;
}
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_iounmap;
}
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;
if (cpu_is_omap16xx())
d->dev_caps = ENABLE_16XX_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__);
ret = -ENOMEM;
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;
dma_pdev = platform_device_register_full(&omap_dma_dev_info);
if (IS_ERR(dma_pdev)) {
ret = PTR_ERR(dma_pdev);
goto exit_release_pdev;
}
return ret;
exit_release_pdev:
platform_device_del(pdev);
exit_release_chan:
kfree(d->chan);
exit_release_d:
kfree(d);
exit_release_p:
kfree(p);
exit_iounmap:
iounmap(dma_base);
exit_device_put:
platform_device_put(pdev);
return ret;
}
arch_initcall(omap1_system_dma_init);