diff options
Diffstat (limited to 'arch/arm/mach-omap1/dma.c')
| -rw-r--r-- | arch/arm/mach-omap1/dma.c | 390 |
1 files changed, 390 insertions, 0 deletions
diff --git a/arch/arm/mach-omap1/dma.c b/arch/arm/mach-omap1/dma.c new file mode 100644 index 000000000000..d8559344c6e2 --- /dev/null +++ b/arch/arm/mach-omap1/dma.c @@ -0,0 +1,390 @@ +/* + * 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/io.h> +#include <linux/slab.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/device.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__); + return -ENODEV; + } + + 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_del; + } + + 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_put; + } + + 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_put: + platform_device_put(pdev); +exit_device_del: + platform_device_del(pdev); + + return ret; +} +arch_initcall(omap1_system_dma_init); |