On Mon, 27 Apr 2015, Andrew Bresticker wrote:
> Add an MFD driver for the XUSB host complex found on NVIDIA Tegra124
> and later SoCs.
>
> Signed-off-by: Andrew Bresticker <abrestic@xxxxxxxxxxxx>
> Cc: Samuel Ortiz <sameo@xxxxxxxxxxxxxxx>
> Cc: Lee Jones <lee.jones@xxxxxxxxxx>
> ---
> New for v7.
> ---
> drivers/mfd/Kconfig | 7 ++
> drivers/mfd/Makefile | 1 +
> drivers/mfd/tegra-xusb.c | 167 +++++++++++++++++++++++++++++++++++++++++++++++
> include/soc/tegra/xusb.h | 19 ++++++
> 4 files changed, 194 insertions(+)
> create mode 100644 drivers/mfd/tegra-xusb.c
> create mode 100644 include/soc/tegra/xusb.h
>
> diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> index d5ad04d..61872b4 100644
> --- a/drivers/mfd/Kconfig
> +++ b/drivers/mfd/Kconfig
> @@ -1430,6 +1430,13 @@ config MFD_STW481X
> in various ST Microelectronics and ST-Ericsson embedded
> Nomadik series.
>
> +config MFD_TEGRA_XUSB
> + tristate "NVIDIA Tegra XUSB"
> + depends on ARCH_TEGRA
> + select MFD_CORE
> + help
> + Support for the XUSB complex found on NVIDIA Tegra124 and later SoCs.
> +
> menu "Multimedia Capabilities Port drivers"
> depends on ARCH_SA1100
>
> diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
> index 0e5cfeb..7588caf 100644
> --- a/drivers/mfd/Makefile
> +++ b/drivers/mfd/Makefile
> @@ -181,6 +181,7 @@ obj-$(CONFIG_MFD_HI6421_PMIC) += hi6421-pmic-core.o
> obj-$(CONFIG_MFD_DLN2) += dln2.o
> obj-$(CONFIG_MFD_RT5033) += rt5033.o
> obj-$(CONFIG_MFD_SKY81452) += sky81452.o
> +obj-$(CONFIG_MFD_TEGRA_XUSB) += tegra-xusb.o
>
> intel-soc-pmic-objs := intel_soc_pmic_core.o intel_soc_pmic_crc.o
> obj-$(CONFIG_INTEL_SOC_PMIC) += intel-soc-pmic.o
> diff --git a/drivers/mfd/tegra-xusb.c b/drivers/mfd/tegra-xusb.c
> new file mode 100644
> index 0000000..d30d259
> --- /dev/null
> +++ b/drivers/mfd/tegra-xusb.c
> @@ -0,0 +1,167 @@
> +/*
> + * NVIDIA Tegra XUSB MFD driver
> + *
> + * Copyright (C) 2015 Google, Inc.
> + *
> + * 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.
> + */
> +
> +#include <linux/interrupt.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/mfd/core.h>
> +#include <linux/of.h>
> +#include <linux/platform_device.h>
> +#include <linux/regmap.h>
> +#include <linux/slab.h>
> +
> +#include <soc/tegra/xusb.h>
> +
> +struct tegra_xusb_soc_data {
> + struct mfd_cell *devs;
> + unsigned int num_devs;
> +};
> +
> +static struct resource tegra_xhci_resources[] = {
> + {
> + .name = "host",
> + .flags = IORESOURCE_IRQ,
> + },
> + {
> + .name = "xhci",
> + .flags = IORESOURCE_MEM,
> + },
> + {
> + .name = "ipfs",
> + .flags = IORESOURCE_MEM,
> + },
> +};
> +
> +static struct resource tegra_xusb_mbox_resources[] = {
> + {
> + .name = "smi",
> + .flags = IORESOURCE_IRQ,
> + },
> +};
DEFINE_RES_IRQ_NAMED()
> +static struct mfd_cell tegra124_xusb_devs[] = {
> + {
> + .name = "tegra-xhci",
> + .of_compatible = "nvidia,tegra124-xhci",
> + },
> + {
> + .name = "tegra-xusb-mbox",
> + .of_compatible = "nvidia,tegra124-xusb-mbox",
> + },
> +};
> +
> +static const struct tegra_xusb_soc_data tegra124_xusb_data = {
> + .devs = tegra124_xusb_devs,
> + .num_devs = ARRAY_SIZE(tegra124_xusb_devs),
> +};
> +
> +static const struct of_device_id tegra_xusb_of_match[] = {
> + { .compatible = "nvidia,tegra124-xusb", .data = &tegra124_xusb_data },
Yuk! Why are you mixing platform data and DT in this way?
Why can't you just stick all of this in DT?
> + {},
> +};
> +
> +MODULE_DEVICE_TABLE(of, tegra_xusb_of_match);
> +static struct regmap_config tegra_fpci_regmap_config = {
> + .reg_bits = 32,
> + .val_bits = 32,
> + .reg_stride = 4,
> +};
> +
> +static int tegra_xusb_probe(struct platform_device *pdev)
> +{
> + const struct tegra_xusb_soc_data *soc;
> + const struct of_device_id *match;
> + struct tegra_xusb *xusb;
> + struct resource *res;
> + void __iomem *fpci_base;
> + int irq, ret;
> +
> + xusb = devm_kzalloc(&pdev->dev, sizeof(*xusb), GFP_KERNEL);
> + if (!xusb)
> + return -ENOMEM;
> + platform_set_drvdata(pdev, xusb);
> +
> + match = of_match_node(tegra_xusb_of_match, pdev->dev.of_node);
> + soc = match->data;
> +
> + irq = platform_get_irq_byname(pdev, "host");
> + if (irq < 0)
> + return irq;
> + tegra_xhci_resources[0].start = irq;
> + tegra_xhci_resources[0].end = irq;
> +
> + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "xhci");
> + if (!res)
> + return -ENODEV;
> + tegra_xhci_resources[1].start = res->start;
> + tegra_xhci_resources[1].end = res->end;
> +
> + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "ipfs");
> + if (!res)
> + return -ENODEV;
> + tegra_xhci_resources[2].start = res->start;
> + tegra_xhci_resources[2].end = res->end;
> +
> + soc->devs[0].resources = tegra_xhci_resources;
> + soc->devs[0].num_resources = ARRAY_SIZE(tegra_xhci_resources);
> +
> + irq = platform_get_irq_byname(pdev, "smi");
> + if (irq < 0)
> + return irq;
> + tegra_xusb_mbox_resources[0].start = irq;
> + tegra_xusb_mbox_resources[0].end = irq;
> +
> + soc->devs[1].resources = tegra_xusb_mbox_resources;
> + soc->devs[1].num_resources = ARRAY_SIZE(tegra_xusb_mbox_resources);
> +
> + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "fpci");
> + fpci_base = devm_ioremap_resource(&pdev->dev, res);
> + if (IS_ERR(fpci_base))
> + return PTR_ERR(fpci_base);
This stuff is not good.
Either let MFD handle it with mfd_cells or stick all of this stuff in
DT and parse it from the child devices.
> + tegra_fpci_regmap_config.max_register = res->end - res->start - 3;
> + xusb->fpci_regs = devm_regmap_init_mmio(&pdev->dev, fpci_base,
> + &tegra_fpci_regmap_config);
> + if (IS_ERR(xusb->fpci_regs)) {
> + ret = PTR_ERR(xusb->fpci_regs);
> + dev_err(&pdev->dev, "Failed to init regmap: %d\n", ret);
> + return ret;
> + }
> +
> + ret = mfd_add_devices(&pdev->dev, -1, soc->devs, soc->num_devs,
> + NULL, 0, NULL);
> + if (ret) {
> + dev_err(&pdev->dev, "Failed to add MFD devices: %d\n", ret);
> + return ret;
> + }
> +
> + return 0;
> +}
> +
> +static int tegra_xusb_remove(struct platform_device *pdev)
> +{
> + mfd_remove_devices(&pdev->dev);
> +
> + return 0;
> +}
> +
> +static struct platform_driver tegra_xusb_driver = {
> + .probe = tegra_xusb_probe,
> + .remove = tegra_xusb_remove,
> + .driver = {
> + .name = "tegra-xusb",
> + .of_match_table = tegra_xusb_of_match,
> + },
> +};
> +module_platform_driver(tegra_xusb_driver);
> +
> +MODULE_DESCRIPTION("NVIDIA Tegra XUSB MFD");
> +MODULE_AUTHOR("Andrew Bresticker <abrestic@xxxxxxxxxxxx>");
> +MODULE_LICENSE("GPL v2");
> diff --git a/include/soc/tegra/xusb.h b/include/soc/tegra/xusb.h
> new file mode 100644
> index 0000000..9d28d90
> --- /dev/null
> +++ b/include/soc/tegra/xusb.h
> @@ -0,0 +1,19 @@
> +/*
> + * Copyright (C) 2014 NVIDIA Corporation
> + * Copyright (C) 2014 Google, Inc.
> + *
> + * 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.
> + */
> +
> +#ifndef __SOC_TEGRA_XUSB_H__
> +#define __SOC_TEGRA_XUSB_H__
> +
> +struct regmap;
> +
> +struct tegra_xusb {
> + struct regmap *fpci_regs;
Are you going to add to this?
> +};
> +
> +#endif /* __SOC_TEGRA_XUSB_H__ */
--
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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