--- /dev/null
+/*
+ * 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);
projects / mv-sheeva.git / blobdiff