| /* |
| * 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 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 >= CPC) ? OMAP1_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 >= CPC) ? OMAP1_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; |
| |
| for (i = CPC; i <= COLOR; 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->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_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); |
