diff options
Diffstat (limited to 'drivers/soc/xilinx/xlnx_vcu_core.c')
| -rw-r--r-- | drivers/soc/xilinx/xlnx_vcu_core.c | 168 |
1 files changed, 168 insertions, 0 deletions
diff --git a/drivers/soc/xilinx/xlnx_vcu_core.c b/drivers/soc/xilinx/xlnx_vcu_core.c new file mode 100644 index 000000000000..0415b283c133 --- /dev/null +++ b/drivers/soc/xilinx/xlnx_vcu_core.c @@ -0,0 +1,168 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Xilinx VCU core driver + * + * Copyright (C) 2018 Xilinx, Inc. + * + * Rajan Vaja <rajan.vaja@xilinx.com> + */ +#include <linux/clk.h> +#include <linux/device.h> +#include <linux/io.h> +#include <linux/mfd/core.h> +#include <linux/module.h> +#include <linux/gpio/consumer.h> +#include <linux/delay.h> +#include <linux/of_platform.h> +#include <soc/xilinx/xlnx_vcu.h> + +static const struct mfd_cell xvcu_devs[] = { + { + .name = "xilinx-vcu-clk", + }, + { + .name = "xilinx-vcu", + }, +}; + +static int xvcu_core_probe(struct platform_device *pdev) +{ + struct xvcu_device *xvcu; + struct resource *res; + int ret; + + xvcu = devm_kzalloc(&pdev->dev, sizeof(*xvcu), GFP_KERNEL); + if (!xvcu) + return -ENOMEM; + + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "vcu_slcr"); + if (!res) { + dev_err(&pdev->dev, "get vcu_slcr memory resource failed.\n"); + return -ENODEV; + } + + xvcu->vcu_slcr_ba = devm_ioremap_nocache(&pdev->dev, res->start, + resource_size(res)); + if (!xvcu->vcu_slcr_ba) { + dev_err(&pdev->dev, "vcu_slcr register mapping failed.\n"); + return -ENOMEM; + } + + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "logicore"); + if (!res) { + dev_err(&pdev->dev, "get logicore memory resource failed.\n"); + return -ENODEV; + } + + xvcu->logicore_reg_ba = devm_ioremap_nocache(&pdev->dev, res->start, + resource_size(res)); + if (!xvcu->logicore_reg_ba) { + dev_err(&pdev->dev, "logicore register mapping failed.\n"); + return -ENOMEM; + } + + dev_set_drvdata(&pdev->dev, xvcu); + + xvcu->aclk = devm_clk_get(&pdev->dev, "aclk"); + if (IS_ERR(xvcu->aclk)) { + dev_err(&pdev->dev, "Could not get aclk clock\n"); + return PTR_ERR(xvcu->aclk); + } + + ret = clk_prepare_enable(xvcu->aclk); + if (ret) { + dev_err(&pdev->dev, "aclk clock enable failed\n"); + return ret; + } + + /* + * Do the Gasket isolation and put the VCU out of reset + * Bit 0 : Gasket isolation + * Bit 1 : put VCU out of reset + */ + xvcu->reset_gpio = devm_gpiod_get_optional(&pdev->dev, "reset", + GPIOD_OUT_LOW); + if (IS_ERR(xvcu->reset_gpio)) { + ret = PTR_ERR(xvcu->reset_gpio); + dev_err(&pdev->dev, "failed to get reset gpio for vcu.\n"); + return ret; + } + + if (xvcu->reset_gpio) { + gpiod_set_value(xvcu->reset_gpio, 0); + /* min 2 clock cycle of vcu pll_ref, slowest freq is 33.33KHz */ + usleep_range(60, 120); + gpiod_set_value(xvcu->reset_gpio, 1); + usleep_range(60, 120); + } else { + dev_warn(&pdev->dev, "No reset gpio info from dts for vcu. This may lead to incorrect functionality if VCU isolation is removed post initialization.\n"); + } + + iowrite32(VCU_GASKET_VALUE, xvcu->logicore_reg_ba + VCU_GASKET_INIT); + + ret = mfd_add_devices(&pdev->dev, PLATFORM_DEVID_NONE, xvcu_devs, + ARRAY_SIZE(xvcu_devs), NULL, 0, NULL); + if (ret) { + dev_err(&pdev->dev, "failed to add MFD devices %d\n", ret); + goto err_mfd_add_devices; + } + + dev_dbg(&pdev->dev, "Successfully added MFD devices\n"); + + return 0; + +err_mfd_add_devices: + /* Add the the Gasket isolation and put the VCU in reset. */ + iowrite32(0, xvcu->logicore_reg_ba + VCU_GASKET_INIT); + + clk_disable_unprepare(xvcu->aclk); + + return ret; +} + +static int xvcu_core_remove(struct platform_device *pdev) +{ + struct xvcu_device *xvcu; + + xvcu = platform_get_drvdata(pdev); + if (!xvcu) + return -ENODEV; + + mfd_remove_devices(&pdev->dev); + + /* Add the the Gasket isolation and put the VCU in reset. */ + if (xvcu->reset_gpio) { + gpiod_set_value(xvcu->reset_gpio, 0); + /* min 2 clock cycle of vcu pll_ref, slowest freq is 33.33KHz */ + usleep_range(60, 120); + gpiod_set_value(xvcu->reset_gpio, 1); + usleep_range(60, 120); + } + iowrite32(0, xvcu->logicore_reg_ba + VCU_GASKET_INIT); + + clk_disable_unprepare(xvcu->aclk); + + return 0; +} + +static const struct of_device_id xvcu_core_of_id_table[] = { + { .compatible = "xlnx,vcu" }, + { .compatible = "xlnx,vcu-logicoreip-1.0" }, + { } +}; +MODULE_DEVICE_TABLE(of, xvcu_core_of_id_table); + +static struct platform_driver xvcu_core_driver = { + .driver = { + .name = "xilinx-vcu-core", + .of_match_table = xvcu_core_of_id_table, + }, + .probe = xvcu_core_probe, + .remove = xvcu_core_remove, +}; + +module_platform_driver(xvcu_core_driver); + +MODULE_AUTHOR("Rajan Vaja <rajan.vaja@xilinx.com>"); +MODULE_DESCRIPTION("Xilinx VCU core Driver"); +MODULE_LICENSE("GPL v2"); |