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Diffstat (limited to 'arch/arm/mach-omap1/dma.c')
-rw-r--r--arch/arm/mach-omap1/dma.c394
1 files changed, 394 insertions, 0 deletions
diff --git a/arch/arm/mach-omap1/dma.c b/arch/arm/mach-omap1/dma.c
new file mode 100644
index 000000000..756966cb7
--- /dev/null
+++ b/arch/arm/mach-omap1/dma.c
@@ -0,0 +1,394 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * 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 - https://www.ti.com/
+ * Converted DMA library into platform driver
+ * - G, Manjunath Kondaiah <manjugk@ti.com>
+ */
+
+#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/dmaengine.h>
+#include <linux/omap-dma.h>
+#include "tc.h"
+
+#include "soc.h"
+
+#define OMAP1_DMA_BASE (0xfffed800)
+
+static u32 enable_1510_mode;
+
+static const struct omap_dma_reg reg_map[] = {
+ [GCR] = { 0x0400, 0x00, OMAP_DMA_REG_16BIT },
+ [GSCR] = { 0x0404, 0x00, OMAP_DMA_REG_16BIT },
+ [GRST1] = { 0x0408, 0x00, OMAP_DMA_REG_16BIT },
+ [HW_ID] = { 0x0442, 0x00, OMAP_DMA_REG_16BIT },
+ [PCH2_ID] = { 0x0444, 0x00, OMAP_DMA_REG_16BIT },
+ [PCH0_ID] = { 0x0446, 0x00, OMAP_DMA_REG_16BIT },
+ [PCH1_ID] = { 0x0448, 0x00, OMAP_DMA_REG_16BIT },
+ [PCHG_ID] = { 0x044a, 0x00, OMAP_DMA_REG_16BIT },
+ [PCHD_ID] = { 0x044c, 0x00, OMAP_DMA_REG_16BIT },
+ [CAPS_0] = { 0x044e, 0x00, OMAP_DMA_REG_2X16BIT },
+ [CAPS_1] = { 0x0452, 0x00, OMAP_DMA_REG_2X16BIT },
+ [CAPS_2] = { 0x0456, 0x00, OMAP_DMA_REG_16BIT },
+ [CAPS_3] = { 0x0458, 0x00, OMAP_DMA_REG_16BIT },
+ [CAPS_4] = { 0x045a, 0x00, OMAP_DMA_REG_16BIT },
+ [PCH2_SR] = { 0x0460, 0x00, OMAP_DMA_REG_16BIT },
+ [PCH0_SR] = { 0x0480, 0x00, OMAP_DMA_REG_16BIT },
+ [PCH1_SR] = { 0x0482, 0x00, OMAP_DMA_REG_16BIT },
+ [PCHD_SR] = { 0x04c0, 0x00, OMAP_DMA_REG_16BIT },
+
+ /* Common Registers */
+ [CSDP] = { 0x0000, 0x40, OMAP_DMA_REG_16BIT },
+ [CCR] = { 0x0002, 0x40, OMAP_DMA_REG_16BIT },
+ [CICR] = { 0x0004, 0x40, OMAP_DMA_REG_16BIT },
+ [CSR] = { 0x0006, 0x40, OMAP_DMA_REG_16BIT },
+ [CEN] = { 0x0010, 0x40, OMAP_DMA_REG_16BIT },
+ [CFN] = { 0x0012, 0x40, OMAP_DMA_REG_16BIT },
+ [CSFI] = { 0x0014, 0x40, OMAP_DMA_REG_16BIT },
+ [CSEI] = { 0x0016, 0x40, OMAP_DMA_REG_16BIT },
+ [CPC] = { 0x0018, 0x40, OMAP_DMA_REG_16BIT }, /* 15xx only */
+ [CSAC] = { 0x0018, 0x40, OMAP_DMA_REG_16BIT },
+ [CDAC] = { 0x001a, 0x40, OMAP_DMA_REG_16BIT },
+ [CDEI] = { 0x001c, 0x40, OMAP_DMA_REG_16BIT },
+ [CDFI] = { 0x001e, 0x40, OMAP_DMA_REG_16BIT },
+ [CLNK_CTRL] = { 0x0028, 0x40, OMAP_DMA_REG_16BIT },
+
+ /* Channel specific register offsets */
+ [CSSA] = { 0x0008, 0x40, OMAP_DMA_REG_2X16BIT },
+ [CDSA] = { 0x000c, 0x40, OMAP_DMA_REG_2X16BIT },
+ [COLOR] = { 0x0020, 0x40, OMAP_DMA_REG_2X16BIT },
+ [CCR2] = { 0x0024, 0x40, OMAP_DMA_REG_16BIT },
+ [LCH_CTRL] = { 0x002a, 0x40, OMAP_DMA_REG_16BIT },
+};
+
+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)
+{
+ void __iomem *addr = dma_base;
+
+ addr += reg_map[reg].offset;
+ addr += reg_map[reg].stride * lch;
+
+ __raw_writew(val, addr);
+ if (reg_map[reg].type == OMAP_DMA_REG_2X16BIT)
+ __raw_writew(val >> 16, addr + 2);
+}
+
+static inline u32 dma_read(int reg, int lch)
+{
+ void __iomem *addr = dma_base;
+ uint32_t val;
+
+ addr += reg_map[reg].offset;
+ addr += reg_map[reg].stride * lch;
+
+ val = __raw_readw(addr);
+ if (reg_map[reg].type == OMAP_DMA_REG_2X16BIT)
+ val |= __raw_readw(addr + 2) << 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);
+ }
+}
+
+static unsigned configure_dma_errata(void)
+{
+ unsigned errata = 0;
+
+ /*
+ * 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),
+ .res = res,
+ .num_res = 1,
+};
+
+/* OMAP1510, OMAP1610*/
+static const struct dma_slave_map omap1xxx_sdma_map[] = {
+ { "omap-mcbsp.1", "tx", SDMA_FILTER_PARAM(8) },
+ { "omap-mcbsp.1", "rx", SDMA_FILTER_PARAM(9) },
+ { "omap-mcbsp.3", "tx", SDMA_FILTER_PARAM(10) },
+ { "omap-mcbsp.3", "rx", SDMA_FILTER_PARAM(11) },
+ { "omap-mcbsp.2", "tx", SDMA_FILTER_PARAM(16) },
+ { "omap-mcbsp.2", "rx", SDMA_FILTER_PARAM(17) },
+ { "mmci-omap.0", "tx", SDMA_FILTER_PARAM(21) },
+ { "mmci-omap.0", "rx", SDMA_FILTER_PARAM(22) },
+ { "omap_udc", "rx0", SDMA_FILTER_PARAM(26) },
+ { "omap_udc", "rx1", SDMA_FILTER_PARAM(27) },
+ { "omap_udc", "rx2", SDMA_FILTER_PARAM(28) },
+ { "omap_udc", "tx0", SDMA_FILTER_PARAM(29) },
+ { "omap_udc", "tx1", SDMA_FILTER_PARAM(30) },
+ { "omap_udc", "tx2", SDMA_FILTER_PARAM(31) },
+ { "mmci-omap.1", "tx", SDMA_FILTER_PARAM(54) },
+ { "mmci-omap.1", "rx", SDMA_FILTER_PARAM(55) },
+};
+
+static struct omap_system_dma_plat_info dma_plat_info __initdata = {
+ .reg_map = reg_map,
+ .channel_stride = 0x40,
+ .show_dma_caps = omap1_show_dma_caps,
+ .clear_lch_regs = omap1_clear_lch_regs,
+ .clear_dma = omap1_clear_dma,
+ .dma_write = dma_write,
+ .dma_read = dma_read,
+};
+
+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;
+ }
+
+ d = kzalloc(sizeof(*d), GFP_KERNEL);
+ if (!d) {
+ ret = -ENOMEM;
+ goto exit_iounmap;
+ }
+
+ /* 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;
+
+ /* available logical channels */
+ if (cpu_is_omap15xx()) {
+ d->lch_count = 9;
+ } else {
+ if (d->dev_caps & ENABLE_1510_MODE)
+ d->lch_count = 9;
+ else
+ d->lch_count = 16;
+ }
+
+ p = dma_plat_info;
+ p.dma_attr = d;
+ p.errata = configure_dma_errata();
+
+ p.slave_map = omap1xxx_sdma_map;
+ p.slavecnt = ARRAY_SIZE(omap1xxx_sdma_map);
+
+ 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_d;
+ }
+
+ 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_d;
+ }
+
+ 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_d:
+ kfree(d);
+exit_iounmap:
+ iounmap(dma_base);
+exit_device_put:
+ platform_device_put(pdev);
+
+ return ret;
+}
+arch_initcall(omap1_system_dma_init);
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-01 04:58:20 +0000