/* * tegra30_ahub.c - Tegra30 AHUB driver * * Copyright (c) 2011,2012, NVIDIA CORPORATION. All rights reserved. * * This program is free software; you can redistribute it and/or modify it * under the terms and conditions of the GNU General Public License, * version 2, as published by the Free Software Foundation. * * This program is distributed in the hope 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, see . */ #include #include #include #include #include #include #include #include #include #include #include #include "tegra30_ahub.h" #define DRV_NAME "tegra30-ahub" static struct tegra30_ahub *ahub; static inline void tegra30_apbif_write(u32 reg, u32 val) { regmap_write(ahub->regmap_apbif, reg, val); } static inline u32 tegra30_apbif_read(u32 reg) { u32 val; regmap_read(ahub->regmap_apbif, reg, &val); return val; } static inline void tegra30_audio_write(u32 reg, u32 val) { regmap_write(ahub->regmap_ahub, reg, val); } static int tegra30_ahub_runtime_suspend(struct device *dev) { regcache_cache_only(ahub->regmap_apbif, true); regcache_cache_only(ahub->regmap_ahub, true); clk_disable_unprepare(ahub->clk_apbif); clk_disable_unprepare(ahub->clk_d_audio); return 0; } /* * clk_apbif isn't required for an I2S<->I2S configuration where no PCM data * is read from or sent to memory. However, that's not something the rest of * the driver supports right now, so we'll just treat the two clocks as one * for now. * * These functions should not be a plain ref-count. Instead, each active stream * contributes some requirement to the minimum clock rate, so starting or * stopping streams should dynamically adjust the clock as required. However, * this is not yet implemented. */ static int tegra30_ahub_runtime_resume(struct device *dev) { int ret; ret = clk_prepare_enable(ahub->clk_d_audio); if (ret) { dev_err(dev, "clk_enable d_audio failed: %d\n", ret); return ret; } ret = clk_prepare_enable(ahub->clk_apbif); if (ret) { dev_err(dev, "clk_enable apbif failed: %d\n", ret); clk_disable(ahub->clk_d_audio); return ret; } regcache_cache_only(ahub->regmap_apbif, false); regcache_cache_only(ahub->regmap_ahub, false); return 0; } int tegra30_ahub_allocate_rx_fifo(enum tegra30_ahub_rxcif *rxcif, unsigned long *fiforeg, unsigned long *reqsel) { int channel; u32 reg, val; channel = find_first_zero_bit(ahub->rx_usage, TEGRA30_AHUB_CHANNEL_CTRL_COUNT); if (channel >= TEGRA30_AHUB_CHANNEL_CTRL_COUNT) return -EBUSY; __set_bit(channel, ahub->rx_usage); *rxcif = TEGRA30_AHUB_RXCIF_APBIF_RX0 + channel; *fiforeg = ahub->apbif_addr + TEGRA30_AHUB_CHANNEL_RXFIFO + (channel * TEGRA30_AHUB_CHANNEL_RXFIFO_STRIDE); *reqsel = ahub->dma_sel + channel; reg = TEGRA30_AHUB_CHANNEL_CTRL + (channel * TEGRA30_AHUB_CHANNEL_CTRL_STRIDE); val = tegra30_apbif_read(reg); val &= ~(TEGRA30_AHUB_CHANNEL_CTRL_RX_THRESHOLD_MASK | TEGRA30_AHUB_CHANNEL_CTRL_RX_PACK_MASK); val |= (7 << TEGRA30_AHUB_CHANNEL_CTRL_RX_THRESHOLD_SHIFT) | TEGRA30_AHUB_CHANNEL_CTRL_RX_PACK_EN | TEGRA30_AHUB_CHANNEL_CTRL_RX_PACK_16; tegra30_apbif_write(reg, val); reg = TEGRA30_AHUB_CIF_RX_CTRL + (channel * TEGRA30_AHUB_CIF_RX_CTRL_STRIDE); val = (0 << TEGRA30_AUDIOCIF_CTRL_FIFO_THRESHOLD_SHIFT) | (1 << TEGRA30_AUDIOCIF_CTRL_AUDIO_CHANNELS_SHIFT) | (1 << TEGRA30_AUDIOCIF_CTRL_CLIENT_CHANNELS_SHIFT) | TEGRA30_AUDIOCIF_CTRL_AUDIO_BITS_16 | TEGRA30_AUDIOCIF_CTRL_CLIENT_BITS_16 | TEGRA30_AUDIOCIF_CTRL_DIRECTION_RX; tegra30_apbif_write(reg, val); return 0; } EXPORT_SYMBOL_GPL(tegra30_ahub_allocate_rx_fifo); int tegra30_ahub_enable_rx_fifo(enum tegra30_ahub_rxcif rxcif) { int channel = rxcif - TEGRA30_AHUB_RXCIF_APBIF_RX0; int reg, val; reg = TEGRA30_AHUB_CHANNEL_CTRL + (channel * TEGRA30_AHUB_CHANNEL_CTRL_STRIDE); val = tegra30_apbif_read(reg); val |= TEGRA30_AHUB_CHANNEL_CTRL_RX_EN; tegra30_apbif_write(reg, val); return 0; } EXPORT_SYMBOL_GPL(tegra30_ahub_enable_rx_fifo); int tegra30_ahub_disable_rx_fifo(enum tegra30_ahub_rxcif rxcif) { int channel = rxcif - TEGRA30_AHUB_RXCIF_APBIF_RX0; int reg, val; reg = TEGRA30_AHUB_CHANNEL_CTRL + (channel * TEGRA30_AHUB_CHANNEL_CTRL_STRIDE); val = tegra30_apbif_read(reg); val &= ~TEGRA30_AHUB_CHANNEL_CTRL_RX_EN; tegra30_apbif_write(reg, val); return 0; } EXPORT_SYMBOL_GPL(tegra30_ahub_disable_rx_fifo); int tegra30_ahub_free_rx_fifo(enum tegra30_ahub_rxcif rxcif) { int channel = rxcif - TEGRA30_AHUB_RXCIF_APBIF_RX0; __clear_bit(channel, ahub->rx_usage); return 0; } EXPORT_SYMBOL_GPL(tegra30_ahub_free_rx_fifo); int tegra30_ahub_allocate_tx_fifo(enum tegra30_ahub_txcif *txcif, unsigned long *fiforeg, unsigned long *reqsel) { int channel; u32 reg, val; channel = find_first_zero_bit(ahub->tx_usage, TEGRA30_AHUB_CHANNEL_CTRL_COUNT); if (channel >= TEGRA30_AHUB_CHANNEL_CTRL_COUNT) return -EBUSY; __set_bit(channel, ahub->tx_usage); *txcif = TEGRA30_AHUB_TXCIF_APBIF_TX0 + channel; *fiforeg = ahub->apbif_addr + TEGRA30_AHUB_CHANNEL_TXFIFO + (channel * TEGRA30_AHUB_CHANNEL_TXFIFO_STRIDE); *reqsel = ahub->dma_sel + channel; reg = TEGRA30_AHUB_CHANNEL_CTRL + (channel * TEGRA30_AHUB_CHANNEL_CTRL_STRIDE); val = tegra30_apbif_read(reg); val &= ~(TEGRA30_AHUB_CHANNEL_CTRL_TX_THRESHOLD_MASK | TEGRA30_AHUB_CHANNEL_CTRL_TX_PACK_MASK); val |= (7 << TEGRA30_AHUB_CHANNEL_CTRL_TX_THRESHOLD_SHIFT) | TEGRA30_AHUB_CHANNEL_CTRL_TX_PACK_EN | TEGRA30_AHUB_CHANNEL_CTRL_TX_PACK_16; tegra30_apbif_write(reg, val); reg = TEGRA30_AHUB_CIF_TX_CTRL + (channel * TEGRA30_AHUB_CIF_TX_CTRL_STRIDE); val = (0 << TEGRA30_AUDIOCIF_CTRL_FIFO_THRESHOLD_SHIFT) | (1 << TEGRA30_AUDIOCIF_CTRL_AUDIO_CHANNELS_SHIFT) | (1 << TEGRA30_AUDIOCIF_CTRL_CLIENT_CHANNELS_SHIFT) | TEGRA30_AUDIOCIF_CTRL_AUDIO_BITS_16 | TEGRA30_AUDIOCIF_CTRL_CLIENT_BITS_16 | TEGRA30_AUDIOCIF_CTRL_DIRECTION_TX; tegra30_apbif_write(reg, val); return 0; } EXPORT_SYMBOL_GPL(tegra30_ahub_allocate_tx_fifo); int tegra30_ahub_enable_tx_fifo(enum tegra30_ahub_txcif txcif) { int channel = txcif - TEGRA30_AHUB_TXCIF_APBIF_TX0; int reg, val; reg = TEGRA30_AHUB_CHANNEL_CTRL + (channel * TEGRA30_AHUB_CHANNEL_CTRL_STRIDE); val = tegra30_apbif_read(reg); val |= TEGRA30_AHUB_CHANNEL_CTRL_TX_EN; tegra30_apbif_write(reg, val); return 0; } EXPORT_SYMBOL_GPL(tegra30_ahub_enable_tx_fifo); int tegra30_ahub_disable_tx_fifo(enum tegra30_ahub_txcif txcif) { int channel = txcif - TEGRA30_AHUB_TXCIF_APBIF_TX0; int reg, val; reg = TEGRA30_AHUB_CHANNEL_CTRL + (channel * TEGRA30_AHUB_CHANNEL_CTRL_STRIDE); val = tegra30_apbif_read(reg); val &= ~TEGRA30_AHUB_CHANNEL_CTRL_TX_EN; tegra30_apbif_write(reg, val); return 0; } EXPORT_SYMBOL_GPL(tegra30_ahub_disable_tx_fifo); int tegra30_ahub_free_tx_fifo(enum tegra30_ahub_txcif txcif) { int channel = txcif - TEGRA30_AHUB_TXCIF_APBIF_TX0; __clear_bit(channel, ahub->tx_usage); return 0; } EXPORT_SYMBOL_GPL(tegra30_ahub_free_tx_fifo); int tegra30_ahub_set_rx_cif_source(enum tegra30_ahub_rxcif rxcif, enum tegra30_ahub_txcif txcif) { int channel = rxcif - TEGRA30_AHUB_RXCIF_APBIF_RX0; int reg; reg = TEGRA30_AHUB_AUDIO_RX + (channel * TEGRA30_AHUB_AUDIO_RX_STRIDE); tegra30_audio_write(reg, 1 << txcif); return 0; } EXPORT_SYMBOL_GPL(tegra30_ahub_set_rx_cif_source); int tegra30_ahub_unset_rx_cif_source(enum tegra30_ahub_rxcif rxcif) { int channel = rxcif - TEGRA30_AHUB_RXCIF_APBIF_RX0; int reg; reg = TEGRA30_AHUB_AUDIO_RX + (channel * TEGRA30_AHUB_AUDIO_RX_STRIDE); tegra30_audio_write(reg, 0); return 0; } EXPORT_SYMBOL_GPL(tegra30_ahub_unset_rx_cif_source); static const char * const configlink_clocks[] = { "i2s0", "i2s1", "i2s2", "i2s3", "i2s4", "dam0", "dam1", "dam2", "spdif_in", }; struct of_dev_auxdata ahub_auxdata[] = { OF_DEV_AUXDATA("nvidia,tegra30-i2s", 0x70080300, "tegra30-i2s.0", NULL), OF_DEV_AUXDATA("nvidia,tegra30-i2s", 0x70080400, "tegra30-i2s.1", NULL), OF_DEV_AUXDATA("nvidia,tegra30-i2s", 0x70080500, "tegra30-i2s.2", NULL), OF_DEV_AUXDATA("nvidia,tegra30-i2s", 0x70080600, "tegra30-i2s.3", NULL), OF_DEV_AUXDATA("nvidia,tegra30-i2s", 0x70080700, "tegra30-i2s.4", NULL), {} }; #define LAST_REG(name) \ (TEGRA30_AHUB_##name + \ (TEGRA30_AHUB_##name##_STRIDE * TEGRA30_AHUB_##name##_COUNT) - 4) #define REG_IN_ARRAY(reg, name) \ ((reg >= TEGRA30_AHUB_##name) && \ (reg <= LAST_REG(name) && \ (!((reg - TEGRA30_AHUB_##name) % TEGRA30_AHUB_##name##_STRIDE)))) static bool tegra30_ahub_apbif_wr_rd_reg(struct device *dev, unsigned int reg) { switch (reg) { case TEGRA30_AHUB_CONFIG_LINK_CTRL: case TEGRA30_AHUB_MISC_CTRL: case TEGRA30_AHUB_APBDMA_LIVE_STATUS: case TEGRA30_AHUB_I2S_LIVE_STATUS: case TEGRA30_AHUB_SPDIF_LIVE_STATUS: case TEGRA30_AHUB_I2S_INT_MASK: case TEGRA30_AHUB_DAM_INT_MASK: case TEGRA30_AHUB_SPDIF_INT_MASK: case TEGRA30_AHUB_APBIF_INT_MASK: case TEGRA30_AHUB_I2S_INT_STATUS: case TEGRA30_AHUB_DAM_INT_STATUS: case TEGRA30_AHUB_SPDIF_INT_STATUS: case TEGRA30_AHUB_APBIF_INT_STATUS: case TEGRA30_AHUB_I2S_INT_SOURCE: case TEGRA30_AHUB_DAM_INT_SOURCE: case TEGRA30_AHUB_SPDIF_INT_SOURCE: case TEGRA30_AHUB_APBIF_INT_SOURCE: case TEGRA30_AHUB_I2S_INT_SET: case TEGRA30_AHUB_DAM_INT_SET: case TEGRA30_AHUB_SPDIF_INT_SET: case TEGRA30_AHUB_APBIF_INT_SET: return true; default: break; }; if (REG_IN_ARRAY(reg, CHANNEL_CTRL) || REG_IN_ARRAY(reg, CHANNEL_CLEAR) || REG_IN_ARRAY(reg, CHANNEL_STATUS) || REG_IN_ARRAY(reg, CHANNEL_TXFIFO) || REG_IN_ARRAY(reg, CHANNEL_RXFIFO) || REG_IN_ARRAY(reg, CIF_TX_CTRL) || REG_IN_ARRAY(reg, CIF_RX_CTRL) || REG_IN_ARRAY(reg, DAM_LIVE_STATUS)) return true; return false; } static bool tegra30_ahub_apbif_volatile_reg(struct device *dev, unsigned int reg) { switch (reg) { case TEGRA30_AHUB_CONFIG_LINK_CTRL: case TEGRA30_AHUB_MISC_CTRL: case TEGRA30_AHUB_APBDMA_LIVE_STATUS: case TEGRA30_AHUB_I2S_LIVE_STATUS: case TEGRA30_AHUB_SPDIF_LIVE_STATUS: case TEGRA30_AHUB_I2S_INT_STATUS: case TEGRA30_AHUB_DAM_INT_STATUS: case TEGRA30_AHUB_SPDIF_INT_STATUS: case TEGRA30_AHUB_APBIF_INT_STATUS: case TEGRA30_AHUB_I2S_INT_SET: case TEGRA30_AHUB_DAM_INT_SET: case TEGRA30_AHUB_SPDIF_INT_SET: case TEGRA30_AHUB_APBIF_INT_SET: return true; default: break; }; if (REG_IN_ARRAY(reg, CHANNEL_CLEAR) || REG_IN_ARRAY(reg, CHANNEL_STATUS) || REG_IN_ARRAY(reg, CHANNEL_TXFIFO) || REG_IN_ARRAY(reg, CHANNEL_RXFIFO) || REG_IN_ARRAY(reg, DAM_LIVE_STATUS)) return true; return false; } static bool tegra30_ahub_apbif_precious_reg(struct device *dev, unsigned int reg) { if (REG_IN_ARRAY(reg, CHANNEL_TXFIFO) || REG_IN_ARRAY(reg, CHANNEL_RXFIFO)) return true; return false; } static const struct regmap_config tegra30_ahub_apbif_regmap_config = { .name = "apbif", .reg_bits = 32, .val_bits = 32, .reg_stride = 4, .max_register = TEGRA30_AHUB_APBIF_INT_SET, .writeable_reg = tegra30_ahub_apbif_wr_rd_reg, .readable_reg = tegra30_ahub_apbif_wr_rd_reg, .volatile_reg = tegra30_ahub_apbif_volatile_reg, .precious_reg = tegra30_ahub_apbif_precious_reg, .cache_type = REGCACHE_RBTREE, }; static bool tegra30_ahub_ahub_wr_rd_reg(struct device *dev, unsigned int reg) { if (REG_IN_ARRAY(reg, AUDIO_RX)) return true; return false; } static const struct regmap_config tegra30_ahub_ahub_regmap_config = { .name = "ahub", .reg_bits = 32, .val_bits = 32, .reg_stride = 4, .max_register = LAST_REG(AUDIO_RX), .writeable_reg = tegra30_ahub_ahub_wr_rd_reg, .readable_reg = tegra30_ahub_ahub_wr_rd_reg, .cache_type = REGCACHE_RBTREE, }; static int tegra30_ahub_probe(struct platform_device *pdev) { struct clk *clk; int i; struct resource *res0, *res1, *region; u32 of_dma[2]; void __iomem *regs_apbif, *regs_ahub; int ret = 0; if (ahub) return -ENODEV; /* * The AHUB hosts a register bus: the "configlink". For this to * operate correctly, all devices on this bus must be out of reset. * Ensure that here. */ for (i = 0; i < ARRAY_SIZE(configlink_clocks); i++) { clk = clk_get_sys(NULL, configlink_clocks[i]); if (IS_ERR(clk)) { dev_err(&pdev->dev, "Can't get clock %s\n", configlink_clocks[i]); ret = PTR_ERR(clk); goto err; } tegra_periph_reset_deassert(clk); clk_put(clk); } ahub = devm_kzalloc(&pdev->dev, sizeof(struct tegra30_ahub), GFP_KERNEL); if (!ahub) { dev_err(&pdev->dev, "Can't allocate tegra30_ahub\n"); ret = -ENOMEM; goto err; } dev_set_drvdata(&pdev->dev, ahub); ahub->dev = &pdev->dev; ahub->clk_d_audio = clk_get(&pdev->dev, "d_audio"); if (IS_ERR(ahub->clk_d_audio)) { dev_err(&pdev->dev, "Can't retrieve ahub d_audio clock\n"); ret = PTR_ERR(ahub->clk_d_audio); goto err; } ahub->clk_apbif = clk_get(&pdev->dev, "apbif"); if (IS_ERR(ahub->clk_apbif)) { dev_err(&pdev->dev, "Can't retrieve ahub apbif clock\n"); ret = PTR_ERR(ahub->clk_apbif); goto err_clk_put_d_audio; } if (of_property_read_u32_array(pdev->dev.of_node, "nvidia,dma-request-selector", of_dma, 2) < 0) { dev_err(&pdev->dev, "Missing property nvidia,dma-request-selector\n"); ret = -ENODEV; goto err_clk_put_d_audio; } ahub->dma_sel = of_dma[1]; res0 = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (!res0) { dev_err(&pdev->dev, "No apbif memory resource\n"); ret = -ENODEV; goto err_clk_put_apbif; } region = devm_request_mem_region(&pdev->dev, res0->start, resource_size(res0), DRV_NAME); if (!region) { dev_err(&pdev->dev, "request region apbif failed\n"); ret = -EBUSY; goto err_clk_put_apbif; } ahub->apbif_addr = res0->start; regs_apbif = devm_ioremap(&pdev->dev, res0->start, resource_size(res0)); if (!regs_apbif) { dev_err(&pdev->dev, "ioremap apbif failed\n"); ret = -ENOMEM; goto err_clk_put_apbif; } ahub->regmap_apbif = devm_regmap_init_mmio(&pdev->dev, regs_apbif, &tegra30_ahub_apbif_regmap_config); if (IS_ERR(ahub->regmap_apbif)) { dev_err(&pdev->dev, "apbif regmap init failed\n"); ret = PTR_ERR(ahub->regmap_apbif); goto err_clk_put_apbif; } regcache_cache_only(ahub->regmap_apbif, true); res1 = platform_get_resource(pdev, IORESOURCE_MEM, 1); if (!res1) { dev_err(&pdev->dev, "No ahub memory resource\n"); ret = -ENODEV; goto err_clk_put_apbif; } region = devm_request_mem_region(&pdev->dev, res1->start, resource_size(res1), DRV_NAME); if (!region) { dev_err(&pdev->dev, "request region ahub failed\n"); ret = -EBUSY; goto err_clk_put_apbif; } regs_ahub = devm_ioremap(&pdev->dev, res1->start, resource_size(res1)); if (!regs_ahub) { dev_err(&pdev->dev, "ioremap ahub failed\n"); ret = -ENOMEM; goto err_clk_put_apbif; } ahub->regmap_ahub = devm_regmap_init_mmio(&pdev->dev, regs_ahub, &tegra30_ahub_ahub_regmap_config); if (IS_ERR(ahub->regmap_ahub)) { dev_err(&pdev->dev, "ahub regmap init failed\n"); ret = PTR_ERR(ahub->regmap_ahub); goto err_clk_put_apbif; } regcache_cache_only(ahub->regmap_ahub, true); pm_runtime_enable(&pdev->dev); if (!pm_runtime_enabled(&pdev->dev)) { ret = tegra30_ahub_runtime_resume(&pdev->dev); if (ret) goto err_pm_disable; } of_platform_populate(pdev->dev.of_node, NULL, ahub_auxdata, &pdev->dev); return 0; err_pm_disable: pm_runtime_disable(&pdev->dev); err_clk_put_apbif: clk_put(ahub->clk_apbif); err_clk_put_d_audio: clk_put(ahub->clk_d_audio); ahub = NULL; err: return ret; } static int tegra30_ahub_remove(struct platform_device *pdev) { if (!ahub) return -ENODEV; pm_runtime_disable(&pdev->dev); if (!pm_runtime_status_suspended(&pdev->dev)) tegra30_ahub_runtime_suspend(&pdev->dev); clk_put(ahub->clk_apbif); clk_put(ahub->clk_d_audio); ahub = NULL; return 0; } static const struct of_device_id tegra30_ahub_of_match[] = { { .compatible = "nvidia,tegra30-ahub", }, {}, }; static const struct dev_pm_ops tegra30_ahub_pm_ops = { SET_RUNTIME_PM_OPS(tegra30_ahub_runtime_suspend, tegra30_ahub_runtime_resume, NULL) }; static struct platform_driver tegra30_ahub_driver = { .probe = tegra30_ahub_probe, .remove = tegra30_ahub_remove, .driver = { .name = DRV_NAME, .owner = THIS_MODULE, .of_match_table = tegra30_ahub_of_match, .pm = &tegra30_ahub_pm_ops, }, }; module_platform_driver(tegra30_ahub_driver); MODULE_AUTHOR("Stephen Warren "); MODULE_DESCRIPTION("Tegra30 AHUB driver"); MODULE_LICENSE("GPL v2"); MODULE_ALIAS("platform:" DRV_NAME); MODULE_DEVICE_TABLE(of, tegra30_ahub_of_match);