--- /dev/null
+/*
+ * tegra20_das.c - Tegra20 DAS driver
+ *
+ * Author: Stephen Warren <swarren@nvidia.com>
+ * Copyright (C) 2010 - NVIDIA, Inc.
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ *
+ */
+
+#include <linux/device.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+#include <sound/soc.h>
+#include "tegra20_das.h"
+
+#define DRV_NAME "tegra20-das"
+
+static struct tegra20_das *das;
+
+static inline void tegra20_das_write(u32 reg, u32 val)
+{
+ regmap_write(das->regmap, reg, val);
+}
+
+static inline u32 tegra20_das_read(u32 reg)
+{
+ u32 val;
+ regmap_read(das->regmap, reg, &val);
+ return val;
+}
+
+int tegra20_das_connect_dap_to_dac(int dap, int dac)
+{
+ u32 addr;
+ u32 reg;
+
+ if (!das)
+ return -ENODEV;
+
+ addr = TEGRA20_DAS_DAP_CTRL_SEL +
+ (dap * TEGRA20_DAS_DAP_CTRL_SEL_STRIDE);
+ reg = dac << TEGRA20_DAS_DAP_CTRL_SEL_DAP_CTRL_SEL_P;
+
+ tegra20_das_write(addr, reg);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(tegra20_das_connect_dap_to_dac);
+
+int tegra20_das_connect_dap_to_dap(int dap, int otherdap, int master,
+ int sdata1rx, int sdata2rx)
+{
+ u32 addr;
+ u32 reg;
+
+ if (!das)
+ return -ENODEV;
+
+ addr = TEGRA20_DAS_DAP_CTRL_SEL +
+ (dap * TEGRA20_DAS_DAP_CTRL_SEL_STRIDE);
+ reg = otherdap << TEGRA20_DAS_DAP_CTRL_SEL_DAP_CTRL_SEL_P |
+ !!sdata2rx << TEGRA20_DAS_DAP_CTRL_SEL_DAP_SDATA2_TX_RX_P |
+ !!sdata1rx << TEGRA20_DAS_DAP_CTRL_SEL_DAP_SDATA1_TX_RX_P |
+ !!master << TEGRA20_DAS_DAP_CTRL_SEL_DAP_MS_SEL_P;
+
+ tegra20_das_write(addr, reg);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(tegra20_das_connect_dap_to_dap);
+
+int tegra20_das_connect_dac_to_dap(int dac, int dap)
+{
+ u32 addr;
+ u32 reg;
+
+ if (!das)
+ return -ENODEV;
+
+ addr = TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL +
+ (dac * TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL_STRIDE);
+ reg = dap << TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_CLK_SEL_P |
+ dap << TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_SDATA1_SEL_P |
+ dap << TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_SDATA2_SEL_P;
+
+ tegra20_das_write(addr, reg);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(tegra20_das_connect_dac_to_dap);
+
+#define LAST_REG(name) \
+ (TEGRA20_DAS_##name + \
+ (TEGRA20_DAS_##name##_STRIDE * (TEGRA20_DAS_##name##_COUNT - 1)))
+
+static bool tegra20_das_wr_rd_reg(struct device *dev, unsigned int reg)
+{
+ if ((reg >= TEGRA20_DAS_DAP_CTRL_SEL) &&
+ (reg <= LAST_REG(DAP_CTRL_SEL)))
+ return true;
+ if ((reg >= TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL) &&
+ (reg <= LAST_REG(DAC_INPUT_DATA_CLK_SEL)))
+ return true;
+
+ return false;
+}
+
+static const struct regmap_config tegra20_das_regmap_config = {
+ .reg_bits = 32,
+ .reg_stride = 4,
+ .val_bits = 32,
+ .max_register = LAST_REG(DAC_INPUT_DATA_CLK_SEL),
+ .writeable_reg = tegra20_das_wr_rd_reg,
+ .readable_reg = tegra20_das_wr_rd_reg,
+ .cache_type = REGCACHE_FLAT,
+};
+
+static int tegra20_das_probe(struct platform_device *pdev)
+{
+ struct resource *res, *region;
+ void __iomem *regs;
+ int ret = 0;
+
+ if (das)
+ return -ENODEV;
+
+ das = devm_kzalloc(&pdev->dev, sizeof(struct tegra20_das), GFP_KERNEL);
+ if (!das) {
+ dev_err(&pdev->dev, "Can't allocate tegra20_das\n");
+ ret = -ENOMEM;
+ goto err;
+ }
+ das->dev = &pdev->dev;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res) {
+ dev_err(&pdev->dev, "No memory resource\n");
+ ret = -ENODEV;
+ goto err;
+ }
+
+ region = devm_request_mem_region(&pdev->dev, res->start,
+ resource_size(res), pdev->name);
+ if (!region) {
+ dev_err(&pdev->dev, "Memory region already claimed\n");
+ ret = -EBUSY;
+ goto err;
+ }
+
+ regs = devm_ioremap(&pdev->dev, res->start, resource_size(res));
+ if (!regs) {
+ dev_err(&pdev->dev, "ioremap failed\n");
+ ret = -ENOMEM;
+ goto err;
+ }
+
+ das->regmap = devm_regmap_init_mmio(&pdev->dev, regs,
+ &tegra20_das_regmap_config);
+ if (IS_ERR(das->regmap)) {
+ dev_err(&pdev->dev, "regmap init failed\n");
+ ret = PTR_ERR(das->regmap);
+ goto err;
+ }
+
+ ret = tegra20_das_connect_dap_to_dac(TEGRA20_DAS_DAP_ID_1,
+ TEGRA20_DAS_DAP_SEL_DAC1);
+ if (ret) {
+ dev_err(&pdev->dev, "Can't set up DAS DAP connection\n");
+ goto err;
+ }
+ ret = tegra20_das_connect_dac_to_dap(TEGRA20_DAS_DAC_ID_1,
+ TEGRA20_DAS_DAC_SEL_DAP1);
+ if (ret) {
+ dev_err(&pdev->dev, "Can't set up DAS DAC connection\n");
+ goto err;
+ }
+
+ ret = tegra20_das_connect_dap_to_dac(TEGRA20_DAS_DAP_ID_3,
+ TEGRA20_DAS_DAP_SEL_DAC3);
+ if (ret) {
+ dev_err(&pdev->dev, "Can't set up DAS DAP connection\n");
+ goto err;
+ }
+ ret = tegra20_das_connect_dac_to_dap(TEGRA20_DAS_DAC_ID_3,
+ TEGRA20_DAS_DAC_SEL_DAP3);
+ if (ret) {
+ dev_err(&pdev->dev, "Can't set up DAS DAC connection\n");
+ goto err;
+ }
+
+ platform_set_drvdata(pdev, das);
+
+ return 0;
+
+err:
+ das = NULL;
+ return ret;
+}
+
+static int tegra20_das_remove(struct platform_device *pdev)
+{
+ if (!das)
+ return -ENODEV;
+
+ das = NULL;
+
+ return 0;
+}
+
+static const struct of_device_id tegra20_das_of_match[] = {
+ { .compatible = "nvidia,tegra20-das", },
+ {},
+};
+
+static struct platform_driver tegra20_das_driver = {
+ .probe = tegra20_das_probe,
+ .remove = tegra20_das_remove,
+ .driver = {
+ .name = DRV_NAME,
+ .of_match_table = tegra20_das_of_match,
+ },
+};
+module_platform_driver(tegra20_das_driver);
+
+MODULE_AUTHOR("Stephen Warren <swarren@nvidia.com>");
+MODULE_DESCRIPTION("Tegra20 DAS driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:" DRV_NAME);
+MODULE_DEVICE_TABLE(of, tegra20_das_of_match);
Code Review / kvmfornfv.git / blobdiff