diff mbox series

[v2,11/14] misc: rp1: RaspberryPi RP1 misc driver

Message ID c5b072393d2dc157d34f6dbeff6261d142d4de69.1728300190.git.andrea.porta@suse.com (mailing list archive)
State Not Applicable, archived
Headers show
Series Add support for RaspberryPi RP1 PCI device using a DT overlay | expand

Commit Message

Andrea della Porta Oct. 7, 2024, 12:39 p.m. UTC 
The RaspberryPi RP1 is a PCI multi function device containing
peripherals ranging from Ethernet to USB controller, I2C, SPI
and others.

Implement a bare minimum driver to operate the RP1, leveraging
actual OF based driver implementations for the on-board peripherals
by loading a devicetree overlay during driver probe.

The peripherals are accessed by mapping MMIO registers starting
from PCI BAR1 region.

With the overlay approach we can achieve more generic and agnostic
approach to managing this chipset, being that it is a PCI endpoint
and could possibly be reused in other hw implementations. The
presented approach is also used by Bootlin's Microchip LAN966x
patchset (see link) as well, for a similar chipset.

Since the gpio line names should be provided by the user, there
is an interface through configfs that allows the userspace to
load a DT overlay that will provide gpio-line-names property.
The interface can be invoked like this:

cat rpi-rp1-gpios-5-b.dtbo > /sys/kernel/config/rp1-cfg/gpio_set_names

and is designed to be similar to what users are already used to
from distro with downstream kernel.

For reasons why this driver is contained in drivers/misc, please
check the links.

This driver is heavily based on downstream code from RaspberryPi
Foundation, and the original author is Phil Elwell.

Link: https://datasheets.raspberrypi.com/rp1/rp1-peripherals.pdf
Link: https://lore.kernel.org/all/20240612140208.GC1504919@google.com/
Link: https://lore.kernel.org/all/83f7fa09-d0e6-4f36-a27d-cee08979be2a@app.fastmail.com/
Link: https://lore.kernel.org/all/2024081356-mutable-everyday-6f9d@gregkh/
Link: https://lore.kernel.org/all/20240808154658.247873-1-herve.codina@bootlin.com/

Signed-off-by: Andrea della Porta <andrea.porta@suse.com>
---
 MAINTAINERS                   |   1 +
 drivers/misc/Kconfig          |   1 +
 drivers/misc/Makefile         |   1 +
 drivers/misc/rp1/Kconfig      |  24 +++
 drivers/misc/rp1/Makefile     |   5 +
 drivers/misc/rp1/rp1-pci.dtso |   8 +
 drivers/misc/rp1/rp1_pci.c    | 365 ++++++++++++++++++++++++++++++++++
 drivers/misc/rp1/rp1_pci.h    |  14 ++
 drivers/pci/quirks.c          |   1 +
 include/linux/pci_ids.h       |   3 +
 10 files changed, 423 insertions(+)
 create mode 100644 drivers/misc/rp1/Kconfig
 create mode 100644 drivers/misc/rp1/Makefile
 create mode 100644 drivers/misc/rp1/rp1-pci.dtso
 create mode 100644 drivers/misc/rp1/rp1_pci.c
 create mode 100644 drivers/misc/rp1/rp1_pci.h

Comments

Herve Codina Oct. 7, 2024, 3:41 p.m. UTC | #1 
Hi Andrea,

Nice to see that other PCI drivers will use the DT overlay over PCI feature!

On Mon,  7 Oct 2024 14:39:54 +0200
Andrea della Porta <andrea.porta@suse.com> wrote:

> The RaspberryPi RP1 is a PCI multi function device containing
> peripherals ranging from Ethernet to USB controller, I2C, SPI
> and others.
> 
> Implement a bare minimum driver to operate the RP1, leveraging
> actual OF based driver implementations for the on-board peripherals
> by loading a devicetree overlay during driver probe.
> 
> The peripherals are accessed by mapping MMIO registers starting
> from PCI BAR1 region.
> 
> With the overlay approach we can achieve more generic and agnostic
> approach to managing this chipset, being that it is a PCI endpoint
> and could possibly be reused in other hw implementations. The
> presented approach is also used by Bootlin's Microchip LAN966x
> patchset (see link) as well, for a similar chipset.
> 
> Since the gpio line names should be provided by the user, there
> is an interface through configfs that allows the userspace to
> load a DT overlay that will provide gpio-line-names property.
> The interface can be invoked like this:
> 
> cat rpi-rp1-gpios-5-b.dtbo > /sys/kernel/config/rp1-cfg/gpio_set_names
> 
> and is designed to be similar to what users are already used to
> from distro with downstream kernel.
> 
> For reasons why this driver is contained in drivers/misc, please
> check the links.
> 
> This driver is heavily based on downstream code from RaspberryPi
> Foundation, and the original author is Phil Elwell.
> 
> Link: https://datasheets.raspberrypi.com/rp1/rp1-peripherals.pdf
> Link: https://lore.kernel.org/all/20240612140208.GC1504919@google.com/
> Link: https://lore.kernel.org/all/83f7fa09-d0e6-4f36-a27d-cee08979be2a@app.fastmail.com/
> Link: https://lore.kernel.org/all/2024081356-mutable-everyday-6f9d@gregkh/
> Link: https://lore.kernel.org/all/20240808154658.247873-1-herve.codina@bootlin.com/
> 
> Signed-off-by: Andrea della Porta <andrea.porta@suse.com>

...
> --- /dev/null
> +++ b/drivers/misc/rp1/Makefile
> @@ -0,0 +1,5 @@
> +# SPDX-License-Identifier: GPL-2.0-only
> +obj-$(CONFIG_MISC_RP1)		+= rp1-pci.o
> +rp1-pci-objs			:= rp1_pci.o rp1-pci.dtbo.o
> +
> +DTC_FLAGS_rp1-pci += -@
Why do you need to add the symbol table (-@ option) in your dtbo ?

...
> diff --git a/drivers/misc/rp1/rp1_pci.c b/drivers/misc/rp1/rp1_pci.c
> new file mode 100644
> index 000000000000..a1f7bf1804c0
> --- /dev/null
> +++ b/drivers/misc/rp1/rp1_pci.c
> @@ -0,0 +1,365 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (c) 2018-24 Raspberry Pi Ltd.
> + * All rights reserved.
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/clkdev.h>
> +#include <linux/clk-provider.h>
> +#include <linux/err.h>
> +#include <linux/interrupt.h>
> +#include <linux/irq.h>
> +#include <linux/irqchip/chained_irq.h>
> +#include <linux/irqdomain.h>
> +#include <linux/module.h>
> +#include <linux/msi.h>
> +#include <linux/of_platform.h>
> +#include <linux/pci.h>
> +#include <linux/platform_device.h>
> +#include <linux/reset.h>
> +
> +#include "rp1_pci.h"
> +
> +#define RP1_DRIVER_NAME		"rp1"
> +
> +#define RP1_HW_IRQ_MASK		GENMASK(5, 0)
> +
> +#define REG_SET			0x800
> +#define REG_CLR			0xc00
> +
> +/* MSI-X CFG registers start at 0x8 */
> +#define MSIX_CFG(x) (0x8 + (4 * (x)))
> +
> +#define MSIX_CFG_IACK_EN        BIT(3)
> +#define MSIX_CFG_IACK           BIT(2)
> +#define MSIX_CFG_ENABLE         BIT(0)
> +
> +/* Address map */
> +#define RP1_PCIE_APBS_BASE	0x108000
> +
> +/* Interrupts */
> +#define RP1_INT_IO_BANK0	0
> +#define RP1_INT_IO_BANK1	1
> +#define RP1_INT_IO_BANK2	2
> +#define RP1_INT_AUDIO_IN	3
> +#define RP1_INT_AUDIO_OUT	4
> +#define RP1_INT_PWM0		5
> +#define RP1_INT_ETH		6
> +#define RP1_INT_I2C0		7
> +#define RP1_INT_I2C1		8
> +#define RP1_INT_I2C2		9
> +#define RP1_INT_I2C3		10
> +#define RP1_INT_I2C4		11
> +#define RP1_INT_I2C5		12
> +#define RP1_INT_I2C6		13
> +#define RP1_INT_I2S0		14
> +#define RP1_INT_I2S1		15
> +#define RP1_INT_I2S2		16
> +#define RP1_INT_SDIO0		17
> +#define RP1_INT_SDIO1		18
> +#define RP1_INT_SPI0		19
> +#define RP1_INT_SPI1		20
> +#define RP1_INT_SPI2		21
> +#define RP1_INT_SPI3		22
> +#define RP1_INT_SPI4		23
> +#define RP1_INT_SPI5		24
> +#define RP1_INT_UART0		25
> +#define RP1_INT_TIMER_0		26
> +#define RP1_INT_TIMER_1		27
> +#define RP1_INT_TIMER_2		28
> +#define RP1_INT_TIMER_3		29
> +#define RP1_INT_USBHOST0	30
> +#define RP1_INT_USBHOST0_0	31
> +#define RP1_INT_USBHOST0_1	32
> +#define RP1_INT_USBHOST0_2	33
> +#define RP1_INT_USBHOST0_3	34
> +#define RP1_INT_USBHOST1	35
> +#define RP1_INT_USBHOST1_0	36
> +#define RP1_INT_USBHOST1_1	37
> +#define RP1_INT_USBHOST1_2	38
> +#define RP1_INT_USBHOST1_3	39
> +#define RP1_INT_DMA		40
> +#define RP1_INT_PWM1		41
> +#define RP1_INT_UART1		42
> +#define RP1_INT_UART2		43
> +#define RP1_INT_UART3		44
> +#define RP1_INT_UART4		45
> +#define RP1_INT_UART5		46
> +#define RP1_INT_MIPI0		47
> +#define RP1_INT_MIPI1		48
> +#define RP1_INT_VIDEO_OUT	49
> +#define RP1_INT_PIO_0		50
> +#define RP1_INT_PIO_1		51
> +#define RP1_INT_ADC_FIFO	52
> +#define RP1_INT_PCIE_OUT	53
> +#define RP1_INT_SPI6		54
> +#define RP1_INT_SPI7		55
> +#define RP1_INT_SPI8		56
> +#define RP1_INT_SYSCFG		58
> +#define RP1_INT_CLOCKS_DEFAULT	59
> +#define RP1_INT_VBUSCTRL	60
> +#define RP1_INT_PROC_MISC	57
> +#define RP1_INT_END		61
> +
> +struct rp1_dev {
> +	struct pci_dev *pdev;
> +	struct device *dev;
> +	struct clk *sys_clk;
> +	struct irq_domain *domain;
> +	struct irq_data *pcie_irqds[64];
> +	void __iomem *bar1;
> +	int ovcs_id;
> +	bool level_triggered_irq[RP1_INT_END];
> +};
> +
> +static void dump_bar(struct pci_dev *pdev, unsigned int bar)
> +{
> +	dev_info(&pdev->dev,
> +		 "bar%d %pR\n",
> +		 bar,
> +		 pci_resource_n(pdev, bar));
> +}

Is this dump_bar() really needed ?

...
> +static int rp1_probe(struct pci_dev *pdev, const struct pci_device_id *id)
> +{
> +	struct device *dev = &pdev->dev;
> +	struct device_node *rp1_node;
> +	struct reset_control *reset;
> +	struct rp1_dev *rp1;
> +	int err  = 0;
> +	int i;
> +
> +	rp1_node = dev_of_node(dev);
> +	if (!rp1_node) {
> +		dev_err(dev, "Missing of_node for device\n");
> +		return -EINVAL;
> +	}
> +
> +	rp1 = devm_kzalloc(&pdev->dev, sizeof(*rp1), GFP_KERNEL);
> +	if (!rp1)
> +		return -ENOMEM;
> +
> +	rp1->pdev = pdev;
> +	rp1->dev = &pdev->dev;
> +
> +	reset = devm_reset_control_get_optional_exclusive(&pdev->dev, NULL);
> +	if (IS_ERR(reset))
> +		return PTR_ERR(reset);
> +	reset_control_reset(reset);

This device is a PCI device.
Seems strange to get the reset control line for a PCI device.

> +
> +	dump_bar(pdev, 0);
> +	dump_bar(pdev, 1);
No sure those 2 dump_bar() calls are really needed.
> +
> +	if (pci_resource_len(pdev, 1) <= 0x10000) {
> +		dev_err(&pdev->dev,
> +			"Not initialised - is the firmware running?\n");
> +		return -EINVAL;
> +	}
> +
> +	err = pcim_enable_device(pdev);
> +	if (err < 0) {
> +		dev_err(&pdev->dev, "Enabling PCI device has failed: %d",
> +			err);
> +		return err;
> +	}
> +
> +	rp1->bar1 = pcim_iomap(pdev, 1, 0);
> +	if (!rp1->bar1) {
> +		dev_err(&pdev->dev, "Cannot map PCI BAR\n");
> +		return -EIO;
> +	}
> +
> +	u32 dtbo_size = __dtbo_rp1_pci_end - __dtbo_rp1_pci_begin;
> +	void *dtbo_start = __dtbo_rp1_pci_begin;

Those declarations should be move at the beginning of the function.

> +
> +	err = of_overlay_fdt_apply(dtbo_start, dtbo_size, &rp1->ovcs_id, rp1_node);
> +	if (err)
> +		return err;
> +

Maybe applying the overlay should be done after the interrupt controller
is ready.

> +	pci_set_master(pdev);
> +
> +	err = pci_alloc_irq_vectors(pdev, RP1_INT_END, RP1_INT_END,
> +				    PCI_IRQ_MSIX);
> +	if (err != RP1_INT_END) {
> +		dev_err(&pdev->dev, "pci_alloc_irq_vectors failed - %d\n", err);
> +		goto err_unload_overlay;
> +	}
> +
> +	pci_set_drvdata(pdev, rp1);
> +	rp1->domain = irq_domain_add_linear(of_find_node_by_name(NULL, "pci-ep-bus"), RP1_INT_END,
> +					    &rp1_domain_ops, rp1);
> +
> +	for (i = 0; i < RP1_INT_END; i++) {
> +		int irq = irq_create_mapping(rp1->domain, i);
> +
> +		if (irq < 0) {
> +			dev_err(&pdev->dev, "failed to create irq mapping\n");
> +			err = irq;
> +			goto err_unload_overlay;
> +		}
> +		irq_set_chip_and_handler(irq, &rp1_irq_chip, handle_level_irq);
> +		irq_set_probe(irq);
> +		irq_set_chained_handler_and_data(pci_irq_vector(pdev, i),
> +						 rp1_chained_handle_irq, rp1);
> +	}
> +
> +	err = of_platform_default_populate(rp1_node, NULL, dev);
> +	if (err)
> +		goto err_unload_overlay;
> +
> +	return 0;
> +
> +err_unload_overlay:
> +	of_overlay_remove(&rp1->ovcs_id);
> +
> +	return err;
> +}
> +
> +static void rp1_remove(struct pci_dev *pdev)
> +{
> +	struct rp1_dev *rp1 = pci_get_drvdata(pdev);
> +	struct device *dev = &pdev->dev;
> +
> +	of_platform_depopulate(dev);
> +	of_overlay_remove(&rp1->ovcs_id);
> +
> +	clk_unregister(rp1->sys_clk);

Unless I missed something, rp1->sys_clk is never set in probe().
If this is correct, clk_unregister() should be removed and also
the related clk header files.

The interrupt controller created at probe() should be destroyed at remove().

> +}
> +

...
> diff --git a/drivers/misc/rp1/rp1_pci.h b/drivers/misc/rp1/rp1_pci.h
> new file mode 100644
> index 000000000000..7982f13bad9b
> --- /dev/null
> +++ b/drivers/misc/rp1/rp1_pci.h
> @@ -0,0 +1,14 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +
> +/*
> + * Copyright (c) 2018-24 Raspberry Pi Ltd.
> + * All rights reserved.
> + */
> +
> +#ifndef _RP1_EXTERN_H_
> +#define _RP1_EXTERN_H_
> +
> +extern char __dtbo_rp1_pci_begin[];
> +extern char __dtbo_rp1_pci_end[];
> +
> +#endif

These two symbols are only used by the rp1_pci.c file.
Not sure that the rp1_pci.h is needed.
Simply declare the symbols in the rp1_pci.c file.


Best regards,
Hervé
kernel test robot Oct. 10, 2024, 7:03 p.m. UTC | #2 
Hi Andrea,

kernel test robot noticed the following build errors:

[auto build test ERROR on robh/for-next]
[also build test ERROR on clk/clk-next char-misc/char-misc-testing char-misc/char-misc-next char-misc/char-misc-linus linus/master v6.12-rc2 next-20241010]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Andrea-della-Porta/dt-bindings-clock-Add-RaspberryPi-RP1-clock-bindings/20241007-204440
base:   https://git.kernel.org/pub/scm/linux/kernel/git/robh/linux.git for-next
patch link:    https://lore.kernel.org/r/c5b072393d2dc157d34f6dbeff6261d142d4de69.1728300190.git.andrea.porta%40suse.com
patch subject: [PATCH v2 11/14] misc: rp1: RaspberryPi RP1 misc driver
config: alpha-randconfig-r061-20241011 (https://download.01.org/0day-ci/archive/20241011/202410110257.OAO10pXN-lkp@intel.com/config)
compiler: alpha-linux-gcc (GCC) 13.3.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241011/202410110257.OAO10pXN-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202410110257.OAO10pXN-lkp@intel.com/

All errors (new ones prefixed by >>):

   drivers/misc/rp1/rp1_pci.c: In function 'rp1_mask_irq':
>> drivers/misc/rp1/rp1_pci.c:139:9: error: implicit declaration of function 'pci_msi_mask_irq'; did you mean 'pci_msix_free_irq'? [-Werror=implicit-function-declaration]
     139 |         pci_msi_mask_irq(pcie_irqd);
         |         ^~~~~~~~~~~~~~~~
         |         pci_msix_free_irq
   drivers/misc/rp1/rp1_pci.c: In function 'rp1_unmask_irq':
>> drivers/misc/rp1/rp1_pci.c:147:9: error: implicit declaration of function 'pci_msi_unmask_irq' [-Werror=implicit-function-declaration]
     147 |         pci_msi_unmask_irq(pcie_irqd);
         |         ^~~~~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors

Kconfig warnings: (for reference only)
   WARNING: unmet direct dependencies detected for GET_FREE_REGION
   Depends on [n]: SPARSEMEM [=n]
   Selected by [y]:
   - RESOURCE_KUNIT_TEST [=y] && RUNTIME_TESTING_MENU [=y] && KUNIT [=y]


vim +139 drivers/misc/rp1/rp1_pci.c

   133	
   134	static void rp1_mask_irq(struct irq_data *irqd)
   135	{
   136		struct rp1_dev *rp1 = irqd->domain->host_data;
   137		struct irq_data *pcie_irqd = rp1->pcie_irqds[irqd->hwirq];
   138	
 > 139		pci_msi_mask_irq(pcie_irqd);
   140	}
   141	
   142	static void rp1_unmask_irq(struct irq_data *irqd)
   143	{
   144		struct rp1_dev *rp1 = irqd->domain->host_data;
   145		struct irq_data *pcie_irqd = rp1->pcie_irqds[irqd->hwirq];
   146	
 > 147		pci_msi_unmask_irq(pcie_irqd);
   148	}
   149
kernel test robot Oct. 11, 2024, 5:15 a.m. UTC | #3 
Hi Andrea,

kernel test robot noticed the following build warnings:

[auto build test WARNING on robh/for-next]
[also build test WARNING on clk/clk-next char-misc/char-misc-testing char-misc/char-misc-next char-misc/char-misc-linus linus/master v6.12-rc2 next-20241010]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Andrea-della-Porta/dt-bindings-clock-Add-RaspberryPi-RP1-clock-bindings/20241007-204440
base:   https://git.kernel.org/pub/scm/linux/kernel/git/robh/linux.git for-next
patch link:    https://lore.kernel.org/r/c5b072393d2dc157d34f6dbeff6261d142d4de69.1728300190.git.andrea.porta%40suse.com
patch subject: [PATCH v2 11/14] misc: rp1: RaspberryPi RP1 misc driver
config: sparc-kismet-CONFIG_OF_IRQ-CONFIG_MISC_RP1-0-0 (https://download.01.org/0day-ci/archive/20241011/202410111247.L5n2NDAU-lkp@intel.com/config)
reproduce: (https://download.01.org/0day-ci/archive/20241011/202410111247.L5n2NDAU-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202410111247.L5n2NDAU-lkp@intel.com/

kismet warnings: (new ones prefixed by >>)
>> kismet: WARNING: unmet direct dependencies detected for OF_IRQ when selected by MISC_RP1
   WARNING: unmet direct dependencies detected for OF_IRQ
     Depends on [n]: OF [=y] && !SPARC [=y] && IRQ_DOMAIN [=y]
     Selected by [y]:
     - MISC_RP1 [=y] && PCI [=y] && PCI_QUIRKS [=y]
   
   WARNING: unmet direct dependencies detected for GET_FREE_REGION
     Depends on [n]: SPARSEMEM [=n]
     Selected by [y]:
     - RESOURCE_KUNIT_TEST [=y] && RUNTIME_TESTING_MENU [=y] && KUNIT [=y]
Dave Stevenson Oct. 24, 2024, 3:21 p.m. UTC | #4 
Hi Andrea

On Mon, 7 Oct 2024 at 14:07, Andrea della Porta <andrea.porta@suse.com> wrote:
>
> The RaspberryPi RP1 is a PCI multi function device containing
> peripherals ranging from Ethernet to USB controller, I2C, SPI
> and others.
>
> Implement a bare minimum driver to operate the RP1, leveraging
> actual OF based driver implementations for the on-board peripherals
> by loading a devicetree overlay during driver probe.
>
> The peripherals are accessed by mapping MMIO registers starting
> from PCI BAR1 region.
>
> With the overlay approach we can achieve more generic and agnostic
> approach to managing this chipset, being that it is a PCI endpoint
> and could possibly be reused in other hw implementations. The
> presented approach is also used by Bootlin's Microchip LAN966x
> patchset (see link) as well, for a similar chipset.
>
> Since the gpio line names should be provided by the user, there
> is an interface through configfs that allows the userspace to
> load a DT overlay that will provide gpio-line-names property.
> The interface can be invoked like this:
>
> cat rpi-rp1-gpios-5-b.dtbo > /sys/kernel/config/rp1-cfg/gpio_set_names
>
> and is designed to be similar to what users are already used to
> from distro with downstream kernel.
>
> For reasons why this driver is contained in drivers/misc, please
> check the links.
>
> This driver is heavily based on downstream code from RaspberryPi
> Foundation, and the original author is Phil Elwell.
>
> Link: https://datasheets.raspberrypi.com/rp1/rp1-peripherals.pdf
> Link: https://lore.kernel.org/all/20240612140208.GC1504919@google.com/
> Link: https://lore.kernel.org/all/83f7fa09-d0e6-4f36-a27d-cee08979be2a@app.fastmail.com/
> Link: https://lore.kernel.org/all/2024081356-mutable-everyday-6f9d@gregkh/
> Link: https://lore.kernel.org/all/20240808154658.247873-1-herve.codina@bootlin.com/
>
> Signed-off-by: Andrea della Porta <andrea.porta@suse.com>
> ---
>  MAINTAINERS                   |   1 +
>  drivers/misc/Kconfig          |   1 +
>  drivers/misc/Makefile         |   1 +
>  drivers/misc/rp1/Kconfig      |  24 +++
>  drivers/misc/rp1/Makefile     |   5 +
>  drivers/misc/rp1/rp1-pci.dtso |   8 +
>  drivers/misc/rp1/rp1_pci.c    | 365 ++++++++++++++++++++++++++++++++++
>  drivers/misc/rp1/rp1_pci.h    |  14 ++
>  drivers/pci/quirks.c          |   1 +
>  include/linux/pci_ids.h       |   3 +
>  10 files changed, 423 insertions(+)
>  create mode 100644 drivers/misc/rp1/Kconfig
>  create mode 100644 drivers/misc/rp1/Makefile
>  create mode 100644 drivers/misc/rp1/rp1-pci.dtso
>  create mode 100644 drivers/misc/rp1/rp1_pci.c
>  create mode 100644 drivers/misc/rp1/rp1_pci.h
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 510a071ede78..032678fb2470 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -19389,6 +19389,7 @@ F:      Documentation/devicetree/bindings/misc/pci1de4,1.yaml
>  F:     Documentation/devicetree/bindings/pci/pci-ep-bus.yaml
>  F:     Documentation/devicetree/bindings/pinctrl/raspberrypi,rp1-gpio.yaml
>  F:     drivers/clk/clk-rp1.c
> +F:     drivers/misc/rp1/
>  F:     drivers/pinctrl/pinctrl-rp1.c
>  F:     include/dt-bindings/clock/rp1.h
>  F:     include/dt-bindings/misc/rp1.h
> diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
> index 3fe7e2a9bd29..ac85cb154100 100644
> --- a/drivers/misc/Kconfig
> +++ b/drivers/misc/Kconfig
> @@ -628,4 +628,5 @@ source "drivers/misc/uacce/Kconfig"
>  source "drivers/misc/pvpanic/Kconfig"
>  source "drivers/misc/mchp_pci1xxxx/Kconfig"
>  source "drivers/misc/keba/Kconfig"
> +source "drivers/misc/rp1/Kconfig"
>  endmenu
> diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
> index a9f94525e181..ae86d69997b4 100644
> --- a/drivers/misc/Makefile
> +++ b/drivers/misc/Makefile
> @@ -72,3 +72,4 @@ obj-$(CONFIG_TPS6594_PFSM)    += tps6594-pfsm.o
>  obj-$(CONFIG_NSM)              += nsm.o
>  obj-$(CONFIG_MARVELL_CN10K_DPI)        += mrvl_cn10k_dpi.o
>  obj-y                          += keba/
> +obj-$(CONFIG_MISC_RP1)         += rp1/
> diff --git a/drivers/misc/rp1/Kconfig b/drivers/misc/rp1/Kconfig
> new file mode 100644
> index 000000000000..29b1fc2fc4af
> --- /dev/null
> +++ b/drivers/misc/rp1/Kconfig
> @@ -0,0 +1,24 @@
> +# SPDX-License-Identifier: GPL-2.0-only
> +#
> +# RaspberryPi RP1 misc device
> +#
> +
> +config MISC_RP1
> +        tristate "RaspberryPi RP1 PCIe support"
> +        depends on PCI && PCI_QUIRKS
> +        select OF
> +        select OF_IRQ
> +        select OF_OVERLAY
> +        select IRQ_DOMAIN
> +        select PCI_DYNAMIC_OF_NODES
> +        help
> +          Support the RP1 peripheral chip found on Raspberry Pi 5 board.
> +
> +          This device supports several sub-devices including e.g. Ethernet
> +         controller, USB controller, I2C, SPI and UART.
> +
> +          The driver is responsible for enabling the DT node once the PCIe
> +         endpoint has been configured, and handling interrupts.
> +
> +          This driver uses an overlay to load other drivers to support for
> +         RP1 internal sub-devices.
> diff --git a/drivers/misc/rp1/Makefile b/drivers/misc/rp1/Makefile
> new file mode 100644
> index 000000000000..70384f5a7d7d
> --- /dev/null
> +++ b/drivers/misc/rp1/Makefile
> @@ -0,0 +1,5 @@
> +# SPDX-License-Identifier: GPL-2.0-only
> +obj-$(CONFIG_MISC_RP1)         += rp1-pci.o
> +rp1-pci-objs                   := rp1_pci.o rp1-pci.dtbo.o
> +
> +DTC_FLAGS_rp1-pci += -@
> diff --git a/drivers/misc/rp1/rp1-pci.dtso b/drivers/misc/rp1/rp1-pci.dtso
> new file mode 100644
> index 000000000000..0bf2f4bb18e6
> --- /dev/null
> +++ b/drivers/misc/rp1/rp1-pci.dtso
> @@ -0,0 +1,8 @@
> +// SPDX-License-Identifier: (GPL-2.0 OR MIT)
> +
> +/* the dts overlay is included from the dts directory so
> + * it can be possible to check it with CHECK_DTBS while
> + * also compile it from the driver source directory.
> + */
> +
> +#include "arm64/broadcom/rp1.dtso"
> diff --git a/drivers/misc/rp1/rp1_pci.c b/drivers/misc/rp1/rp1_pci.c
> new file mode 100644
> index 000000000000..a1f7bf1804c0
> --- /dev/null
> +++ b/drivers/misc/rp1/rp1_pci.c
> @@ -0,0 +1,365 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (c) 2018-24 Raspberry Pi Ltd.
> + * All rights reserved.
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/clkdev.h>
> +#include <linux/clk-provider.h>
> +#include <linux/err.h>
> +#include <linux/interrupt.h>
> +#include <linux/irq.h>
> +#include <linux/irqchip/chained_irq.h>
> +#include <linux/irqdomain.h>
> +#include <linux/module.h>
> +#include <linux/msi.h>
> +#include <linux/of_platform.h>
> +#include <linux/pci.h>
> +#include <linux/platform_device.h>
> +#include <linux/reset.h>
> +
> +#include "rp1_pci.h"
> +
> +#define RP1_DRIVER_NAME                "rp1"
> +
> +#define RP1_HW_IRQ_MASK                GENMASK(5, 0)
> +
> +#define REG_SET                        0x800
> +#define REG_CLR                        0xc00
> +
> +/* MSI-X CFG registers start at 0x8 */
> +#define MSIX_CFG(x) (0x8 + (4 * (x)))
> +
> +#define MSIX_CFG_IACK_EN        BIT(3)
> +#define MSIX_CFG_IACK           BIT(2)
> +#define MSIX_CFG_ENABLE         BIT(0)
> +
> +/* Address map */
> +#define RP1_PCIE_APBS_BASE     0x108000
> +
> +/* Interrupts */
> +#define RP1_INT_IO_BANK0       0
> +#define RP1_INT_IO_BANK1       1
> +#define RP1_INT_IO_BANK2       2
> +#define RP1_INT_AUDIO_IN       3
> +#define RP1_INT_AUDIO_OUT      4
> +#define RP1_INT_PWM0           5
> +#define RP1_INT_ETH            6
> +#define RP1_INT_I2C0           7
> +#define RP1_INT_I2C1           8
> +#define RP1_INT_I2C2           9
> +#define RP1_INT_I2C3           10
> +#define RP1_INT_I2C4           11
> +#define RP1_INT_I2C5           12
> +#define RP1_INT_I2C6           13
> +#define RP1_INT_I2S0           14
> +#define RP1_INT_I2S1           15
> +#define RP1_INT_I2S2           16
> +#define RP1_INT_SDIO0          17
> +#define RP1_INT_SDIO1          18
> +#define RP1_INT_SPI0           19
> +#define RP1_INT_SPI1           20
> +#define RP1_INT_SPI2           21
> +#define RP1_INT_SPI3           22
> +#define RP1_INT_SPI4           23
> +#define RP1_INT_SPI5           24
> +#define RP1_INT_UART0          25
> +#define RP1_INT_TIMER_0                26
> +#define RP1_INT_TIMER_1                27
> +#define RP1_INT_TIMER_2                28
> +#define RP1_INT_TIMER_3                29
> +#define RP1_INT_USBHOST0       30
> +#define RP1_INT_USBHOST0_0     31
> +#define RP1_INT_USBHOST0_1     32
> +#define RP1_INT_USBHOST0_2     33
> +#define RP1_INT_USBHOST0_3     34
> +#define RP1_INT_USBHOST1       35
> +#define RP1_INT_USBHOST1_0     36
> +#define RP1_INT_USBHOST1_1     37
> +#define RP1_INT_USBHOST1_2     38
> +#define RP1_INT_USBHOST1_3     39
> +#define RP1_INT_DMA            40
> +#define RP1_INT_PWM1           41
> +#define RP1_INT_UART1          42
> +#define RP1_INT_UART2          43
> +#define RP1_INT_UART3          44
> +#define RP1_INT_UART4          45
> +#define RP1_INT_UART5          46
> +#define RP1_INT_MIPI0          47
> +#define RP1_INT_MIPI1          48
> +#define RP1_INT_VIDEO_OUT      49
> +#define RP1_INT_PIO_0          50
> +#define RP1_INT_PIO_1          51
> +#define RP1_INT_ADC_FIFO       52
> +#define RP1_INT_PCIE_OUT       53
> +#define RP1_INT_SPI6           54
> +#define RP1_INT_SPI7           55
> +#define RP1_INT_SPI8           56
> +#define RP1_INT_SYSCFG         58
> +#define RP1_INT_CLOCKS_DEFAULT 59
> +#define RP1_INT_VBUSCTRL       60
> +#define RP1_INT_PROC_MISC      57
> +#define RP1_INT_END            61
> +
> +struct rp1_dev {
> +       struct pci_dev *pdev;
> +       struct device *dev;
> +       struct clk *sys_clk;
> +       struct irq_domain *domain;
> +       struct irq_data *pcie_irqds[64];
> +       void __iomem *bar1;
> +       int ovcs_id;
> +       bool level_triggered_irq[RP1_INT_END];
> +};
> +
> +static void dump_bar(struct pci_dev *pdev, unsigned int bar)
> +{
> +       dev_info(&pdev->dev,
> +                "bar%d %pR\n",
> +                bar,
> +                pci_resource_n(pdev, bar));
> +}
> +
> +static void msix_cfg_set(struct rp1_dev *rp1, unsigned int hwirq, u32 value)
> +{
> +       iowrite32(value, rp1->bar1 + RP1_PCIE_APBS_BASE + REG_SET + MSIX_CFG(hwirq));
> +}
> +
> +static void msix_cfg_clr(struct rp1_dev *rp1, unsigned int hwirq, u32 value)
> +{
> +       iowrite32(value, rp1->bar1 + RP1_PCIE_APBS_BASE + REG_CLR + MSIX_CFG(hwirq));
> +}
> +
> +static void rp1_mask_irq(struct irq_data *irqd)
> +{
> +       struct rp1_dev *rp1 = irqd->domain->host_data;
> +       struct irq_data *pcie_irqd = rp1->pcie_irqds[irqd->hwirq];
> +
> +       pci_msi_mask_irq(pcie_irqd);
> +}
> +
> +static void rp1_unmask_irq(struct irq_data *irqd)
> +{
> +       struct rp1_dev *rp1 = irqd->domain->host_data;
> +       struct irq_data *pcie_irqd = rp1->pcie_irqds[irqd->hwirq];
> +
> +       pci_msi_unmask_irq(pcie_irqd);
> +}
> +
> +static int rp1_irq_set_type(struct irq_data *irqd, unsigned int type)
> +{
> +       struct rp1_dev *rp1 = irqd->domain->host_data;
> +       unsigned int hwirq = (unsigned int)irqd->hwirq;
> +
> +       switch (type) {
> +       case IRQ_TYPE_LEVEL_HIGH:
> +               dev_dbg(rp1->dev, "MSIX IACK EN for irq %d\n", hwirq);
> +               msix_cfg_set(rp1, hwirq, MSIX_CFG_IACK_EN);
> +               rp1->level_triggered_irq[hwirq] = true;
> +       break;
> +       case IRQ_TYPE_EDGE_RISING:
> +               msix_cfg_clr(rp1, hwirq, MSIX_CFG_IACK_EN);
> +               rp1->level_triggered_irq[hwirq] = false;
> +               break;
> +       default:
> +               return -EINVAL;
> +       }
> +
> +       return 0;
> +}
> +
> +static struct irq_chip rp1_irq_chip = {
> +       .name            = "rp1_irq_chip",
> +       .irq_mask        = rp1_mask_irq,
> +       .irq_unmask      = rp1_unmask_irq,
> +       .irq_set_type    = rp1_irq_set_type,
> +};
> +
> +static void rp1_chained_handle_irq(struct irq_desc *desc)
> +{
> +       unsigned int hwirq = desc->irq_data.hwirq & RP1_HW_IRQ_MASK;
> +       struct rp1_dev *rp1 = irq_desc_get_handler_data(desc);
> +       struct irq_chip *chip = irq_desc_get_chip(desc);
> +       int virq;
> +
> +       chained_irq_enter(chip, desc);
> +
> +       virq = irq_find_mapping(rp1->domain, hwirq);
> +       generic_handle_irq(virq);
> +       if (rp1->level_triggered_irq[hwirq])
> +               msix_cfg_set(rp1, hwirq, MSIX_CFG_IACK);
> +
> +       chained_irq_exit(chip, desc);
> +}
> +
> +static int rp1_irq_xlate(struct irq_domain *d, struct device_node *node,
> +                        const u32 *intspec, unsigned int intsize,
> +                        unsigned long *out_hwirq, unsigned int *out_type)
> +{
> +       struct rp1_dev *rp1 = d->host_data;
> +       struct irq_data *pcie_irqd;
> +       unsigned long hwirq;
> +       int pcie_irq;
> +       int ret;
> +
> +       ret = irq_domain_xlate_twocell(d, node, intspec, intsize,
> +                                      &hwirq, out_type);
> +       if (ret)
> +               return ret;
> +
> +       pcie_irq = pci_irq_vector(rp1->pdev, hwirq);
> +       pcie_irqd = irq_get_irq_data(pcie_irq);
> +       rp1->pcie_irqds[hwirq] = pcie_irqd;
> +       *out_hwirq = hwirq;
> +
> +       return 0;
> +}
> +
> +static int rp1_irq_activate(struct irq_domain *d, struct irq_data *irqd,
> +                           bool reserve)
> +{
> +       struct rp1_dev *rp1 = d->host_data;
> +
> +       msix_cfg_set(rp1, (unsigned int)irqd->hwirq, MSIX_CFG_ENABLE);
> +
> +       return 0;
> +}
> +
> +static void rp1_irq_deactivate(struct irq_domain *d, struct irq_data *irqd)
> +{
> +       struct rp1_dev *rp1 = d->host_data;
> +
> +       msix_cfg_clr(rp1, (unsigned int)irqd->hwirq, MSIX_CFG_ENABLE);
> +}
> +
> +static const struct irq_domain_ops rp1_domain_ops = {
> +       .xlate      = rp1_irq_xlate,
> +       .activate   = rp1_irq_activate,
> +       .deactivate = rp1_irq_deactivate,
> +};
> +
> +static int rp1_probe(struct pci_dev *pdev, const struct pci_device_id *id)
> +{
> +       struct device *dev = &pdev->dev;
> +       struct device_node *rp1_node;
> +       struct reset_control *reset;
> +       struct rp1_dev *rp1;
> +       int err  = 0;
> +       int i;
> +
> +       rp1_node = dev_of_node(dev);
> +       if (!rp1_node) {
> +               dev_err(dev, "Missing of_node for device\n");
> +               return -EINVAL;
> +       }
> +
> +       rp1 = devm_kzalloc(&pdev->dev, sizeof(*rp1), GFP_KERNEL);
> +       if (!rp1)
> +               return -ENOMEM;
> +
> +       rp1->pdev = pdev;
> +       rp1->dev = &pdev->dev;
> +
> +       reset = devm_reset_control_get_optional_exclusive(&pdev->dev, NULL);
> +       if (IS_ERR(reset))
> +               return PTR_ERR(reset);
> +       reset_control_reset(reset);
> +
> +       dump_bar(pdev, 0);
> +       dump_bar(pdev, 1);
> +
> +       if (pci_resource_len(pdev, 1) <= 0x10000) {
> +               dev_err(&pdev->dev,
> +                       "Not initialised - is the firmware running?\n");
> +               return -EINVAL;
> +       }
> +
> +       err = pcim_enable_device(pdev);
> +       if (err < 0) {
> +               dev_err(&pdev->dev, "Enabling PCI device has failed: %d",
> +                       err);
> +               return err;
> +       }
> +
> +       rp1->bar1 = pcim_iomap(pdev, 1, 0);
> +       if (!rp1->bar1) {
> +               dev_err(&pdev->dev, "Cannot map PCI BAR\n");
> +               return -EIO;
> +       }
> +
> +       u32 dtbo_size = __dtbo_rp1_pci_end - __dtbo_rp1_pci_begin;
> +       void *dtbo_start = __dtbo_rp1_pci_begin;
> +
> +       err = of_overlay_fdt_apply(dtbo_start, dtbo_size, &rp1->ovcs_id, rp1_node);
> +       if (err)
> +               return err;
> +
> +       pci_set_master(pdev);
> +
> +       err = pci_alloc_irq_vectors(pdev, RP1_INT_END, RP1_INT_END,
> +                                   PCI_IRQ_MSIX);
> +       if (err != RP1_INT_END) {
> +               dev_err(&pdev->dev, "pci_alloc_irq_vectors failed - %d\n", err);
> +               goto err_unload_overlay;
> +       }
> +
> +       pci_set_drvdata(pdev, rp1);
> +       rp1->domain = irq_domain_add_linear(of_find_node_by_name(NULL, "pci-ep-bus"), RP1_INT_END,
> +                                           &rp1_domain_ops, rp1);
> +
> +       for (i = 0; i < RP1_INT_END; i++) {
> +               int irq = irq_create_mapping(rp1->domain, i);
> +
> +               if (irq < 0) {
> +                       dev_err(&pdev->dev, "failed to create irq mapping\n");
> +                       err = irq;
> +                       goto err_unload_overlay;
> +               }
> +               irq_set_chip_and_handler(irq, &rp1_irq_chip, handle_level_irq);
> +               irq_set_probe(irq);
> +               irq_set_chained_handler_and_data(pci_irq_vector(pdev, i),
> +                                                rp1_chained_handle_irq, rp1);
> +       }
> +
> +       err = of_platform_default_populate(rp1_node, NULL, dev);
> +       if (err)
> +               goto err_unload_overlay;
> +
> +       return 0;
> +
> +err_unload_overlay:
> +       of_overlay_remove(&rp1->ovcs_id);
> +
> +       return err;
> +}
> +
> +static void rp1_remove(struct pci_dev *pdev)
> +{
> +       struct rp1_dev *rp1 = pci_get_drvdata(pdev);
> +       struct device *dev = &pdev->dev;
> +
> +       of_platform_depopulate(dev);
> +       of_overlay_remove(&rp1->ovcs_id);
> +
> +       clk_unregister(rp1->sys_clk);
> +}
> +
> +static const struct pci_device_id dev_id_table[] = {
> +       { PCI_DEVICE(PCI_VENDOR_ID_RPI, PCI_DEVICE_ID_RPI_RP1_C0), },
> +       { 0, }
> +};

You need a

MODULE_DEVICE_TABLE(pci, dev_id_table);

here in order to load the module for the cases where it isn't
built-in. Otherwise you have to manually modprobe the module.

Cheers.
  Dave

> +
> +static struct pci_driver rp1_driver = {
> +       .name           = RP1_DRIVER_NAME,
> +       .id_table       = dev_id_table,
> +       .probe          = rp1_probe,
> +       .remove         = rp1_remove,
> +};
> +
> +module_pci_driver(rp1_driver);
> +
> +MODULE_AUTHOR("Phil Elwell <phil@raspberrypi.com>");
> +MODULE_AUTHOR("Andrea della Porta <andrea.porta@suse.com>");
> +MODULE_DESCRIPTION("RP1 wrapper");
> +MODULE_LICENSE("GPL");
> diff --git a/drivers/misc/rp1/rp1_pci.h b/drivers/misc/rp1/rp1_pci.h
> new file mode 100644
> index 000000000000..7982f13bad9b
> --- /dev/null
> +++ b/drivers/misc/rp1/rp1_pci.h
> @@ -0,0 +1,14 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +
> +/*
> + * Copyright (c) 2018-24 Raspberry Pi Ltd.
> + * All rights reserved.
> + */
> +
> +#ifndef _RP1_EXTERN_H_
> +#define _RP1_EXTERN_H_
> +
> +extern char __dtbo_rp1_pci_begin[];
> +extern char __dtbo_rp1_pci_end[];
> +
> +#endif
> diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
> index dccb60c1d9cc..41e77d94ff73 100644
> --- a/drivers/pci/quirks.c
> +++ b/drivers/pci/quirks.c
> @@ -6266,6 +6266,7 @@ DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0xa76e, dpc_log_size);
>  DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_XILINX, 0x5020, of_pci_make_dev_node);
>  DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_XILINX, 0x5021, of_pci_make_dev_node);
>  DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_REDHAT, 0x0005, of_pci_make_dev_node);
> +DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_RPI, PCI_DEVICE_ID_RPI_RP1_C0, of_pci_make_dev_node);
>
>  /*
>   * Devices known to require a longer delay before first config space access
> diff --git a/include/linux/pci_ids.h b/include/linux/pci_ids.h
> index 4cf6aaed5f35..c7e6cd10ac52 100644
> --- a/include/linux/pci_ids.h
> +++ b/include/linux/pci_ids.h
> @@ -2611,6 +2611,9 @@
>  #define PCI_VENDOR_ID_TEKRAM           0x1de1
>  #define PCI_DEVICE_ID_TEKRAM_DC290     0xdc29
>
> +#define PCI_VENDOR_ID_RPI              0x1de4
> +#define PCI_DEVICE_ID_RPI_RP1_C0       0x0001
> +
>  #define PCI_VENDOR_ID_ALIBABA          0x1ded
>
>  #define PCI_VENDOR_ID_CXL              0x1e98
> --
> 2.35.3
>
>
Andrea della Porta Oct. 25, 2024, 8:29 a.m. UTC | #5 
Hi Dave,

On 16:21 Thu 24 Oct     , Dave Stevenson wrote:
> Hi Andrea
> 
> On Mon, 7 Oct 2024 at 14:07, Andrea della Porta <andrea.porta@suse.com> wrote:
> >

...

> > +static const struct pci_device_id dev_id_table[] = {
> > +       { PCI_DEVICE(PCI_VENDOR_ID_RPI, PCI_DEVICE_ID_RPI_RP1_C0), },
> > +       { 0, }
> > +};
> 
> You need a
> 
> MODULE_DEVICE_TABLE(pci, dev_id_table);
> 
> here in order to load the module for the cases where it isn't
> built-in. Otherwise you have to manually modprobe the module.

Sure, thanks for the heads up!

Regards,
Andrea

> 
> Cheers.
>   Dave

...
Andrea della Porta Oct. 28, 2024, 9:57 a.m. UTC | #6 
Hi Herve,

On 17:41 Mon 07 Oct     , Herve Codina wrote:
> Hi Andrea,
> 
> Nice to see that other PCI drivers will use the DT overlay over PCI feature!
> 
> On Mon,  7 Oct 2024 14:39:54 +0200
> Andrea della Porta <andrea.porta@suse.com> wrote:
> 
> > The RaspberryPi RP1 is a PCI multi function device containing
> > peripherals ranging from Ethernet to USB controller, I2C, SPI
> > and others.
> > 
> > Implement a bare minimum driver to operate the RP1, leveraging
> > actual OF based driver implementations for the on-board peripherals
> > by loading a devicetree overlay during driver probe.
> > 
> > The peripherals are accessed by mapping MMIO registers starting
> > from PCI BAR1 region.
> > 
> > With the overlay approach we can achieve more generic and agnostic
> > approach to managing this chipset, being that it is a PCI endpoint
> > and could possibly be reused in other hw implementations. The
> > presented approach is also used by Bootlin's Microchip LAN966x
> > patchset (see link) as well, for a similar chipset.
> > 
> > Since the gpio line names should be provided by the user, there
> > is an interface through configfs that allows the userspace to
> > load a DT overlay that will provide gpio-line-names property.
> > The interface can be invoked like this:
> > 
> > cat rpi-rp1-gpios-5-b.dtbo > /sys/kernel/config/rp1-cfg/gpio_set_names
> > 
> > and is designed to be similar to what users are already used to
> > from distro with downstream kernel.
> > 
> > For reasons why this driver is contained in drivers/misc, please
> > check the links.
> > 
> > This driver is heavily based on downstream code from RaspberryPi
> > Foundation, and the original author is Phil Elwell.
> > 
> > Link: https://datasheets.raspberrypi.com/rp1/rp1-peripherals.pdf
> > Link: https://lore.kernel.org/all/20240612140208.GC1504919@google.com/
> > Link: https://lore.kernel.org/all/83f7fa09-d0e6-4f36-a27d-cee08979be2a@app.fastmail.com/
> > Link: https://lore.kernel.org/all/2024081356-mutable-everyday-6f9d@gregkh/
> > Link: https://lore.kernel.org/all/20240808154658.247873-1-herve.codina@bootlin.com/
> > 
> > Signed-off-by: Andrea della Porta <andrea.porta@suse.com>
> 
> ...
> > --- /dev/null
> > +++ b/drivers/misc/rp1/Makefile
> > @@ -0,0 +1,5 @@
> > +# SPDX-License-Identifier: GPL-2.0-only
> > +obj-$(CONFIG_MISC_RP1)		+= rp1-pci.o
> > +rp1-pci-objs			:= rp1_pci.o rp1-pci.dtbo.o
> > +
> > +DTC_FLAGS_rp1-pci += -@
> Why do you need to add the symbol table (-@ option) in your dtbo ?

This was needed for loading the dtbo for gpio-line-names over the dtbo for
RP1, but now that I've dropped that patch it is not needed anymore, so I'll
remove that.

> 
> ...
> > diff --git a/drivers/misc/rp1/rp1_pci.c b/drivers/misc/rp1/rp1_pci.c
> > new file mode 100644
> > index 000000000000..a1f7bf1804c0
> > --- /dev/null
> > +++ b/drivers/misc/rp1/rp1_pci.c
> > @@ -0,0 +1,365 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/*
> > + * Copyright (c) 2018-24 Raspberry Pi Ltd.
> > + * All rights reserved.
> > + */
> > +
> > +#include <linux/clk.h>
> > +#include <linux/clkdev.h>
> > +#include <linux/clk-provider.h>
> > +#include <linux/err.h>
> > +#include <linux/interrupt.h>
> > +#include <linux/irq.h>
> > +#include <linux/irqchip/chained_irq.h>
> > +#include <linux/irqdomain.h>
> > +#include <linux/module.h>
> > +#include <linux/msi.h>
> > +#include <linux/of_platform.h>
> > +#include <linux/pci.h>
> > +#include <linux/platform_device.h>
> > +#include <linux/reset.h>
> > +
> > +#include "rp1_pci.h"
> > +
> > +#define RP1_DRIVER_NAME		"rp1"
> > +
> > +#define RP1_HW_IRQ_MASK		GENMASK(5, 0)
> > +
> > +#define REG_SET			0x800
> > +#define REG_CLR			0xc00
> > +
> > +/* MSI-X CFG registers start at 0x8 */
> > +#define MSIX_CFG(x) (0x8 + (4 * (x)))
> > +
> > +#define MSIX_CFG_IACK_EN        BIT(3)
> > +#define MSIX_CFG_IACK           BIT(2)
> > +#define MSIX_CFG_ENABLE         BIT(0)
> > +
> > +/* Address map */
> > +#define RP1_PCIE_APBS_BASE	0x108000
> > +
> > +/* Interrupts */
> > +#define RP1_INT_IO_BANK0	0
> > +#define RP1_INT_IO_BANK1	1
> > +#define RP1_INT_IO_BANK2	2
> > +#define RP1_INT_AUDIO_IN	3
> > +#define RP1_INT_AUDIO_OUT	4
> > +#define RP1_INT_PWM0		5
> > +#define RP1_INT_ETH		6
> > +#define RP1_INT_I2C0		7
> > +#define RP1_INT_I2C1		8
> > +#define RP1_INT_I2C2		9
> > +#define RP1_INT_I2C3		10
> > +#define RP1_INT_I2C4		11
> > +#define RP1_INT_I2C5		12
> > +#define RP1_INT_I2C6		13
> > +#define RP1_INT_I2S0		14
> > +#define RP1_INT_I2S1		15
> > +#define RP1_INT_I2S2		16
> > +#define RP1_INT_SDIO0		17
> > +#define RP1_INT_SDIO1		18
> > +#define RP1_INT_SPI0		19
> > +#define RP1_INT_SPI1		20
> > +#define RP1_INT_SPI2		21
> > +#define RP1_INT_SPI3		22
> > +#define RP1_INT_SPI4		23
> > +#define RP1_INT_SPI5		24
> > +#define RP1_INT_UART0		25
> > +#define RP1_INT_TIMER_0		26
> > +#define RP1_INT_TIMER_1		27
> > +#define RP1_INT_TIMER_2		28
> > +#define RP1_INT_TIMER_3		29
> > +#define RP1_INT_USBHOST0	30
> > +#define RP1_INT_USBHOST0_0	31
> > +#define RP1_INT_USBHOST0_1	32
> > +#define RP1_INT_USBHOST0_2	33
> > +#define RP1_INT_USBHOST0_3	34
> > +#define RP1_INT_USBHOST1	35
> > +#define RP1_INT_USBHOST1_0	36
> > +#define RP1_INT_USBHOST1_1	37
> > +#define RP1_INT_USBHOST1_2	38
> > +#define RP1_INT_USBHOST1_3	39
> > +#define RP1_INT_DMA		40
> > +#define RP1_INT_PWM1		41
> > +#define RP1_INT_UART1		42
> > +#define RP1_INT_UART2		43
> > +#define RP1_INT_UART3		44
> > +#define RP1_INT_UART4		45
> > +#define RP1_INT_UART5		46
> > +#define RP1_INT_MIPI0		47
> > +#define RP1_INT_MIPI1		48
> > +#define RP1_INT_VIDEO_OUT	49
> > +#define RP1_INT_PIO_0		50
> > +#define RP1_INT_PIO_1		51
> > +#define RP1_INT_ADC_FIFO	52
> > +#define RP1_INT_PCIE_OUT	53
> > +#define RP1_INT_SPI6		54
> > +#define RP1_INT_SPI7		55
> > +#define RP1_INT_SPI8		56
> > +#define RP1_INT_SYSCFG		58
> > +#define RP1_INT_CLOCKS_DEFAULT	59
> > +#define RP1_INT_VBUSCTRL	60
> > +#define RP1_INT_PROC_MISC	57
> > +#define RP1_INT_END		61
> > +
> > +struct rp1_dev {
> > +	struct pci_dev *pdev;
> > +	struct device *dev;
> > +	struct clk *sys_clk;
> > +	struct irq_domain *domain;
> > +	struct irq_data *pcie_irqds[64];
> > +	void __iomem *bar1;
> > +	int ovcs_id;
> > +	bool level_triggered_irq[RP1_INT_END];
> > +};
> > +
> > +static void dump_bar(struct pci_dev *pdev, unsigned int bar)
> > +{
> > +	dev_info(&pdev->dev,
> > +		 "bar%d %pR\n",
> > +		 bar,
> > +		 pci_resource_n(pdev, bar));
> > +}
> 
> Is this dump_bar() really needed ?

Nope. Removed.

> 
> ...
> > +static int rp1_probe(struct pci_dev *pdev, const struct pci_device_id *id)
> > +{
> > +	struct device *dev = &pdev->dev;
> > +	struct device_node *rp1_node;
> > +	struct reset_control *reset;
> > +	struct rp1_dev *rp1;
> > +	int err  = 0;
> > +	int i;
> > +
> > +	rp1_node = dev_of_node(dev);
> > +	if (!rp1_node) {
> > +		dev_err(dev, "Missing of_node for device\n");
> > +		return -EINVAL;
> > +	}
> > +
> > +	rp1 = devm_kzalloc(&pdev->dev, sizeof(*rp1), GFP_KERNEL);
> > +	if (!rp1)
> > +		return -ENOMEM;
> > +
> > +	rp1->pdev = pdev;
> > +	rp1->dev = &pdev->dev;
> > +
> > +	reset = devm_reset_control_get_optional_exclusive(&pdev->dev, NULL);
> > +	if (IS_ERR(reset))
> > +		return PTR_ERR(reset);
> > +	reset_control_reset(reset);
> 
> This device is a PCI device.
> Seems strange to get the reset control line for a PCI device.

And it isn't declared in teh node either, so right now seems a no-op.
Removed.

> 
> > +
> > +	dump_bar(pdev, 0);
> > +	dump_bar(pdev, 1);
> No sure those 2 dump_bar() calls are really needed.

Removed as well.

> > +
> > +	if (pci_resource_len(pdev, 1) <= 0x10000) {
> > +		dev_err(&pdev->dev,
> > +			"Not initialised - is the firmware running?\n");
> > +		return -EINVAL;
> > +	}
> > +
> > +	err = pcim_enable_device(pdev);
> > +	if (err < 0) {
> > +		dev_err(&pdev->dev, "Enabling PCI device has failed: %d",
> > +			err);
> > +		return err;
> > +	}
> > +
> > +	rp1->bar1 = pcim_iomap(pdev, 1, 0);
> > +	if (!rp1->bar1) {
> > +		dev_err(&pdev->dev, "Cannot map PCI BAR\n");
> > +		return -EIO;
> > +	}
> > +
> > +	u32 dtbo_size = __dtbo_rp1_pci_end - __dtbo_rp1_pci_begin;
> > +	void *dtbo_start = __dtbo_rp1_pci_begin;
> 
> Those declarations should be move at the beginning of the function.

Ack.

> 
> > +
> > +	err = of_overlay_fdt_apply(dtbo_start, dtbo_size, &rp1->ovcs_id, rp1_node);
> > +	if (err)
> > +		return err;
> > +
> 
> Maybe applying the overlay should be done after the interrupt controller
> is ready.

Right.

> 
> > +	pci_set_master(pdev);
> > +
> > +	err = pci_alloc_irq_vectors(pdev, RP1_INT_END, RP1_INT_END,
> > +				    PCI_IRQ_MSIX);
> > +	if (err != RP1_INT_END) {
> > +		dev_err(&pdev->dev, "pci_alloc_irq_vectors failed - %d\n", err);
> > +		goto err_unload_overlay;
> > +	}
> > +
> > +	pci_set_drvdata(pdev, rp1);
> > +	rp1->domain = irq_domain_add_linear(of_find_node_by_name(NULL, "pci-ep-bus"), RP1_INT_END,
> > +					    &rp1_domain_ops, rp1);
> > +
> > +	for (i = 0; i < RP1_INT_END; i++) {
> > +		int irq = irq_create_mapping(rp1->domain, i);
> > +
> > +		if (irq < 0) {
> > +			dev_err(&pdev->dev, "failed to create irq mapping\n");
> > +			err = irq;
> > +			goto err_unload_overlay;
> > +		}
> > +		irq_set_chip_and_handler(irq, &rp1_irq_chip, handle_level_irq);
> > +		irq_set_probe(irq);
> > +		irq_set_chained_handler_and_data(pci_irq_vector(pdev, i),
> > +						 rp1_chained_handle_irq, rp1);
> > +	}
> > +
> > +	err = of_platform_default_populate(rp1_node, NULL, dev);
> > +	if (err)
> > +		goto err_unload_overlay;
> > +
> > +	return 0;
> > +
> > +err_unload_overlay:
> > +	of_overlay_remove(&rp1->ovcs_id);
> > +
> > +	return err;
> > +}
> > +
> > +static void rp1_remove(struct pci_dev *pdev)
> > +{
> > +	struct rp1_dev *rp1 = pci_get_drvdata(pdev);
> > +	struct device *dev = &pdev->dev;
> > +
> > +	of_platform_depopulate(dev);
> > +	of_overlay_remove(&rp1->ovcs_id);
> > +
> > +	clk_unregister(rp1->sys_clk);
> 
> Unless I missed something, rp1->sys_clk is never set in probe().
> If this is correct, clk_unregister() should be removed and also
> the related clk header files.

Ack.

> 
> The interrupt controller created at probe() should be destroyed at remove().

Ack.

> 
> > +}
> > +
> 
> ...
> > diff --git a/drivers/misc/rp1/rp1_pci.h b/drivers/misc/rp1/rp1_pci.h
> > new file mode 100644
> > index 000000000000..7982f13bad9b
> > --- /dev/null
> > +++ b/drivers/misc/rp1/rp1_pci.h
> > @@ -0,0 +1,14 @@
> > +/* SPDX-License-Identifier: GPL-2.0 */
> > +
> > +/*
> > + * Copyright (c) 2018-24 Raspberry Pi Ltd.
> > + * All rights reserved.
> > + */
> > +
> > +#ifndef _RP1_EXTERN_H_
> > +#define _RP1_EXTERN_H_
> > +
> > +extern char __dtbo_rp1_pci_begin[];
> > +extern char __dtbo_rp1_pci_end[];
> > +
> > +#endif
> 
> These two symbols are only used by the rp1_pci.c file.
> Not sure that the rp1_pci.h is needed.
> Simply declare the symbols in the rp1_pci.c file.

I agree with you, and I did exactly as you suggest in the very first submission
of this patch, but I received a couple of comments against it, so I've created
the new header file.

Many thanks,
Andrea


> 
> 
> Best regards,
> Hervé
diff mbox series

Patch

diff --git a/MAINTAINERS b/MAINTAINERS
index 510a071ede78..032678fb2470 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -19389,6 +19389,7 @@  F:	Documentation/devicetree/bindings/misc/pci1de4,1.yaml
 F:	Documentation/devicetree/bindings/pci/pci-ep-bus.yaml
 F:	Documentation/devicetree/bindings/pinctrl/raspberrypi,rp1-gpio.yaml
 F:	drivers/clk/clk-rp1.c
+F:	drivers/misc/rp1/
 F:	drivers/pinctrl/pinctrl-rp1.c
 F:	include/dt-bindings/clock/rp1.h
 F:	include/dt-bindings/misc/rp1.h
diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
index 3fe7e2a9bd29..ac85cb154100 100644
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -628,4 +628,5 @@  source "drivers/misc/uacce/Kconfig"
 source "drivers/misc/pvpanic/Kconfig"
 source "drivers/misc/mchp_pci1xxxx/Kconfig"
 source "drivers/misc/keba/Kconfig"
+source "drivers/misc/rp1/Kconfig"
 endmenu
diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
index a9f94525e181..ae86d69997b4 100644
--- a/drivers/misc/Makefile
+++ b/drivers/misc/Makefile
@@ -72,3 +72,4 @@  obj-$(CONFIG_TPS6594_PFSM)	+= tps6594-pfsm.o
 obj-$(CONFIG_NSM)		+= nsm.o
 obj-$(CONFIG_MARVELL_CN10K_DPI)	+= mrvl_cn10k_dpi.o
 obj-y				+= keba/
+obj-$(CONFIG_MISC_RP1)		+= rp1/
diff --git a/drivers/misc/rp1/Kconfig b/drivers/misc/rp1/Kconfig
new file mode 100644
index 000000000000..29b1fc2fc4af
--- /dev/null
+++ b/drivers/misc/rp1/Kconfig
@@ -0,0 +1,24 @@ 
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# RaspberryPi RP1 misc device
+#
+
+config MISC_RP1
+        tristate "RaspberryPi RP1 PCIe support"
+        depends on PCI && PCI_QUIRKS
+        select OF
+        select OF_IRQ
+        select OF_OVERLAY
+        select IRQ_DOMAIN
+        select PCI_DYNAMIC_OF_NODES
+        help
+          Support the RP1 peripheral chip found on Raspberry Pi 5 board.
+
+          This device supports several sub-devices including e.g. Ethernet
+	  controller, USB controller, I2C, SPI and UART.
+
+          The driver is responsible for enabling the DT node once the PCIe
+	  endpoint has been configured, and handling interrupts.
+
+          This driver uses an overlay to load other drivers to support for
+	  RP1 internal sub-devices.
diff --git a/drivers/misc/rp1/Makefile b/drivers/misc/rp1/Makefile
new file mode 100644
index 000000000000..70384f5a7d7d
--- /dev/null
+++ b/drivers/misc/rp1/Makefile
@@ -0,0 +1,5 @@ 
+# SPDX-License-Identifier: GPL-2.0-only
+obj-$(CONFIG_MISC_RP1)		+= rp1-pci.o
+rp1-pci-objs			:= rp1_pci.o rp1-pci.dtbo.o
+
+DTC_FLAGS_rp1-pci += -@
diff --git a/drivers/misc/rp1/rp1-pci.dtso b/drivers/misc/rp1/rp1-pci.dtso
new file mode 100644
index 000000000000..0bf2f4bb18e6
--- /dev/null
+++ b/drivers/misc/rp1/rp1-pci.dtso
@@ -0,0 +1,8 @@ 
+// SPDX-License-Identifier: (GPL-2.0 OR MIT)
+
+/* the dts overlay is included from the dts directory so
+ * it can be possible to check it with CHECK_DTBS while
+ * also compile it from the driver source directory.
+ */
+
+#include "arm64/broadcom/rp1.dtso"
diff --git a/drivers/misc/rp1/rp1_pci.c b/drivers/misc/rp1/rp1_pci.c
new file mode 100644
index 000000000000..a1f7bf1804c0
--- /dev/null
+++ b/drivers/misc/rp1/rp1_pci.c
@@ -0,0 +1,365 @@ 
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2018-24 Raspberry Pi Ltd.
+ * All rights reserved.
+ */
+
+#include <linux/clk.h>
+#include <linux/clkdev.h>
+#include <linux/clk-provider.h>
+#include <linux/err.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/irqchip/chained_irq.h>
+#include <linux/irqdomain.h>
+#include <linux/module.h>
+#include <linux/msi.h>
+#include <linux/of_platform.h>
+#include <linux/pci.h>
+#include <linux/platform_device.h>
+#include <linux/reset.h>
+
+#include "rp1_pci.h"
+
+#define RP1_DRIVER_NAME		"rp1"
+
+#define RP1_HW_IRQ_MASK		GENMASK(5, 0)
+
+#define REG_SET			0x800
+#define REG_CLR			0xc00
+
+/* MSI-X CFG registers start at 0x8 */
+#define MSIX_CFG(x) (0x8 + (4 * (x)))
+
+#define MSIX_CFG_IACK_EN        BIT(3)
+#define MSIX_CFG_IACK           BIT(2)
+#define MSIX_CFG_ENABLE         BIT(0)
+
+/* Address map */
+#define RP1_PCIE_APBS_BASE	0x108000
+
+/* Interrupts */
+#define RP1_INT_IO_BANK0	0
+#define RP1_INT_IO_BANK1	1
+#define RP1_INT_IO_BANK2	2
+#define RP1_INT_AUDIO_IN	3
+#define RP1_INT_AUDIO_OUT	4
+#define RP1_INT_PWM0		5
+#define RP1_INT_ETH		6
+#define RP1_INT_I2C0		7
+#define RP1_INT_I2C1		8
+#define RP1_INT_I2C2		9
+#define RP1_INT_I2C3		10
+#define RP1_INT_I2C4		11
+#define RP1_INT_I2C5		12
+#define RP1_INT_I2C6		13
+#define RP1_INT_I2S0		14
+#define RP1_INT_I2S1		15
+#define RP1_INT_I2S2		16
+#define RP1_INT_SDIO0		17
+#define RP1_INT_SDIO1		18
+#define RP1_INT_SPI0		19
+#define RP1_INT_SPI1		20
+#define RP1_INT_SPI2		21
+#define RP1_INT_SPI3		22
+#define RP1_INT_SPI4		23
+#define RP1_INT_SPI5		24
+#define RP1_INT_UART0		25
+#define RP1_INT_TIMER_0		26
+#define RP1_INT_TIMER_1		27
+#define RP1_INT_TIMER_2		28
+#define RP1_INT_TIMER_3		29
+#define RP1_INT_USBHOST0	30
+#define RP1_INT_USBHOST0_0	31
+#define RP1_INT_USBHOST0_1	32
+#define RP1_INT_USBHOST0_2	33
+#define RP1_INT_USBHOST0_3	34
+#define RP1_INT_USBHOST1	35
+#define RP1_INT_USBHOST1_0	36
+#define RP1_INT_USBHOST1_1	37
+#define RP1_INT_USBHOST1_2	38
+#define RP1_INT_USBHOST1_3	39
+#define RP1_INT_DMA		40
+#define RP1_INT_PWM1		41
+#define RP1_INT_UART1		42
+#define RP1_INT_UART2		43
+#define RP1_INT_UART3		44
+#define RP1_INT_UART4		45
+#define RP1_INT_UART5		46
+#define RP1_INT_MIPI0		47
+#define RP1_INT_MIPI1		48
+#define RP1_INT_VIDEO_OUT	49
+#define RP1_INT_PIO_0		50
+#define RP1_INT_PIO_1		51
+#define RP1_INT_ADC_FIFO	52
+#define RP1_INT_PCIE_OUT	53
+#define RP1_INT_SPI6		54
+#define RP1_INT_SPI7		55
+#define RP1_INT_SPI8		56
+#define RP1_INT_SYSCFG		58
+#define RP1_INT_CLOCKS_DEFAULT	59
+#define RP1_INT_VBUSCTRL	60
+#define RP1_INT_PROC_MISC	57
+#define RP1_INT_END		61
+
+struct rp1_dev {
+	struct pci_dev *pdev;
+	struct device *dev;
+	struct clk *sys_clk;
+	struct irq_domain *domain;
+	struct irq_data *pcie_irqds[64];
+	void __iomem *bar1;
+	int ovcs_id;
+	bool level_triggered_irq[RP1_INT_END];
+};
+
+static void dump_bar(struct pci_dev *pdev, unsigned int bar)
+{
+	dev_info(&pdev->dev,
+		 "bar%d %pR\n",
+		 bar,
+		 pci_resource_n(pdev, bar));
+}
+
+static void msix_cfg_set(struct rp1_dev *rp1, unsigned int hwirq, u32 value)
+{
+	iowrite32(value, rp1->bar1 + RP1_PCIE_APBS_BASE + REG_SET + MSIX_CFG(hwirq));
+}
+
+static void msix_cfg_clr(struct rp1_dev *rp1, unsigned int hwirq, u32 value)
+{
+	iowrite32(value, rp1->bar1 + RP1_PCIE_APBS_BASE + REG_CLR + MSIX_CFG(hwirq));
+}
+
+static void rp1_mask_irq(struct irq_data *irqd)
+{
+	struct rp1_dev *rp1 = irqd->domain->host_data;
+	struct irq_data *pcie_irqd = rp1->pcie_irqds[irqd->hwirq];
+
+	pci_msi_mask_irq(pcie_irqd);
+}
+
+static void rp1_unmask_irq(struct irq_data *irqd)
+{
+	struct rp1_dev *rp1 = irqd->domain->host_data;
+	struct irq_data *pcie_irqd = rp1->pcie_irqds[irqd->hwirq];
+
+	pci_msi_unmask_irq(pcie_irqd);
+}
+
+static int rp1_irq_set_type(struct irq_data *irqd, unsigned int type)
+{
+	struct rp1_dev *rp1 = irqd->domain->host_data;
+	unsigned int hwirq = (unsigned int)irqd->hwirq;
+
+	switch (type) {
+	case IRQ_TYPE_LEVEL_HIGH:
+		dev_dbg(rp1->dev, "MSIX IACK EN for irq %d\n", hwirq);
+		msix_cfg_set(rp1, hwirq, MSIX_CFG_IACK_EN);
+		rp1->level_triggered_irq[hwirq] = true;
+	break;
+	case IRQ_TYPE_EDGE_RISING:
+		msix_cfg_clr(rp1, hwirq, MSIX_CFG_IACK_EN);
+		rp1->level_triggered_irq[hwirq] = false;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static struct irq_chip rp1_irq_chip = {
+	.name            = "rp1_irq_chip",
+	.irq_mask        = rp1_mask_irq,
+	.irq_unmask      = rp1_unmask_irq,
+	.irq_set_type    = rp1_irq_set_type,
+};
+
+static void rp1_chained_handle_irq(struct irq_desc *desc)
+{
+	unsigned int hwirq = desc->irq_data.hwirq & RP1_HW_IRQ_MASK;
+	struct rp1_dev *rp1 = irq_desc_get_handler_data(desc);
+	struct irq_chip *chip = irq_desc_get_chip(desc);
+	int virq;
+
+	chained_irq_enter(chip, desc);
+
+	virq = irq_find_mapping(rp1->domain, hwirq);
+	generic_handle_irq(virq);
+	if (rp1->level_triggered_irq[hwirq])
+		msix_cfg_set(rp1, hwirq, MSIX_CFG_IACK);
+
+	chained_irq_exit(chip, desc);
+}
+
+static int rp1_irq_xlate(struct irq_domain *d, struct device_node *node,
+			 const u32 *intspec, unsigned int intsize,
+			 unsigned long *out_hwirq, unsigned int *out_type)
+{
+	struct rp1_dev *rp1 = d->host_data;
+	struct irq_data *pcie_irqd;
+	unsigned long hwirq;
+	int pcie_irq;
+	int ret;
+
+	ret = irq_domain_xlate_twocell(d, node, intspec, intsize,
+				       &hwirq, out_type);
+	if (ret)
+		return ret;
+
+	pcie_irq = pci_irq_vector(rp1->pdev, hwirq);
+	pcie_irqd = irq_get_irq_data(pcie_irq);
+	rp1->pcie_irqds[hwirq] = pcie_irqd;
+	*out_hwirq = hwirq;
+
+	return 0;
+}
+
+static int rp1_irq_activate(struct irq_domain *d, struct irq_data *irqd,
+			    bool reserve)
+{
+	struct rp1_dev *rp1 = d->host_data;
+
+	msix_cfg_set(rp1, (unsigned int)irqd->hwirq, MSIX_CFG_ENABLE);
+
+	return 0;
+}
+
+static void rp1_irq_deactivate(struct irq_domain *d, struct irq_data *irqd)
+{
+	struct rp1_dev *rp1 = d->host_data;
+
+	msix_cfg_clr(rp1, (unsigned int)irqd->hwirq, MSIX_CFG_ENABLE);
+}
+
+static const struct irq_domain_ops rp1_domain_ops = {
+	.xlate      = rp1_irq_xlate,
+	.activate   = rp1_irq_activate,
+	.deactivate = rp1_irq_deactivate,
+};
+
+static int rp1_probe(struct pci_dev *pdev, const struct pci_device_id *id)
+{
+	struct device *dev = &pdev->dev;
+	struct device_node *rp1_node;
+	struct reset_control *reset;
+	struct rp1_dev *rp1;
+	int err  = 0;
+	int i;
+
+	rp1_node = dev_of_node(dev);
+	if (!rp1_node) {
+		dev_err(dev, "Missing of_node for device\n");
+		return -EINVAL;
+	}
+
+	rp1 = devm_kzalloc(&pdev->dev, sizeof(*rp1), GFP_KERNEL);
+	if (!rp1)
+		return -ENOMEM;
+
+	rp1->pdev = pdev;
+	rp1->dev = &pdev->dev;
+
+	reset = devm_reset_control_get_optional_exclusive(&pdev->dev, NULL);
+	if (IS_ERR(reset))
+		return PTR_ERR(reset);
+	reset_control_reset(reset);
+
+	dump_bar(pdev, 0);
+	dump_bar(pdev, 1);
+
+	if (pci_resource_len(pdev, 1) <= 0x10000) {
+		dev_err(&pdev->dev,
+			"Not initialised - is the firmware running?\n");
+		return -EINVAL;
+	}
+
+	err = pcim_enable_device(pdev);
+	if (err < 0) {
+		dev_err(&pdev->dev, "Enabling PCI device has failed: %d",
+			err);
+		return err;
+	}
+
+	rp1->bar1 = pcim_iomap(pdev, 1, 0);
+	if (!rp1->bar1) {
+		dev_err(&pdev->dev, "Cannot map PCI BAR\n");
+		return -EIO;
+	}
+
+	u32 dtbo_size = __dtbo_rp1_pci_end - __dtbo_rp1_pci_begin;
+	void *dtbo_start = __dtbo_rp1_pci_begin;
+
+	err = of_overlay_fdt_apply(dtbo_start, dtbo_size, &rp1->ovcs_id, rp1_node);
+	if (err)
+		return err;
+
+	pci_set_master(pdev);
+
+	err = pci_alloc_irq_vectors(pdev, RP1_INT_END, RP1_INT_END,
+				    PCI_IRQ_MSIX);
+	if (err != RP1_INT_END) {
+		dev_err(&pdev->dev, "pci_alloc_irq_vectors failed - %d\n", err);
+		goto err_unload_overlay;
+	}
+
+	pci_set_drvdata(pdev, rp1);
+	rp1->domain = irq_domain_add_linear(of_find_node_by_name(NULL, "pci-ep-bus"), RP1_INT_END,
+					    &rp1_domain_ops, rp1);
+
+	for (i = 0; i < RP1_INT_END; i++) {
+		int irq = irq_create_mapping(rp1->domain, i);
+
+		if (irq < 0) {
+			dev_err(&pdev->dev, "failed to create irq mapping\n");
+			err = irq;
+			goto err_unload_overlay;
+		}
+		irq_set_chip_and_handler(irq, &rp1_irq_chip, handle_level_irq);
+		irq_set_probe(irq);
+		irq_set_chained_handler_and_data(pci_irq_vector(pdev, i),
+						 rp1_chained_handle_irq, rp1);
+	}
+
+	err = of_platform_default_populate(rp1_node, NULL, dev);
+	if (err)
+		goto err_unload_overlay;
+
+	return 0;
+
+err_unload_overlay:
+	of_overlay_remove(&rp1->ovcs_id);
+
+	return err;
+}
+
+static void rp1_remove(struct pci_dev *pdev)
+{
+	struct rp1_dev *rp1 = pci_get_drvdata(pdev);
+	struct device *dev = &pdev->dev;
+
+	of_platform_depopulate(dev);
+	of_overlay_remove(&rp1->ovcs_id);
+
+	clk_unregister(rp1->sys_clk);
+}
+
+static const struct pci_device_id dev_id_table[] = {
+	{ PCI_DEVICE(PCI_VENDOR_ID_RPI, PCI_DEVICE_ID_RPI_RP1_C0), },
+	{ 0, }
+};
+
+static struct pci_driver rp1_driver = {
+	.name		= RP1_DRIVER_NAME,
+	.id_table	= dev_id_table,
+	.probe		= rp1_probe,
+	.remove		= rp1_remove,
+};
+
+module_pci_driver(rp1_driver);
+
+MODULE_AUTHOR("Phil Elwell <phil@raspberrypi.com>");
+MODULE_AUTHOR("Andrea della Porta <andrea.porta@suse.com>");
+MODULE_DESCRIPTION("RP1 wrapper");
+MODULE_LICENSE("GPL");
diff --git a/drivers/misc/rp1/rp1_pci.h b/drivers/misc/rp1/rp1_pci.h
new file mode 100644
index 000000000000..7982f13bad9b
--- /dev/null
+++ b/drivers/misc/rp1/rp1_pci.h
@@ -0,0 +1,14 @@ 
+/* SPDX-License-Identifier: GPL-2.0 */
+
+/*
+ * Copyright (c) 2018-24 Raspberry Pi Ltd.
+ * All rights reserved.
+ */
+
+#ifndef _RP1_EXTERN_H_
+#define _RP1_EXTERN_H_
+
+extern char __dtbo_rp1_pci_begin[];
+extern char __dtbo_rp1_pci_end[];
+
+#endif
diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index dccb60c1d9cc..41e77d94ff73 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -6266,6 +6266,7 @@  DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0xa76e, dpc_log_size);
 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_XILINX, 0x5020, of_pci_make_dev_node);
 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_XILINX, 0x5021, of_pci_make_dev_node);
 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_REDHAT, 0x0005, of_pci_make_dev_node);
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_RPI, PCI_DEVICE_ID_RPI_RP1_C0, of_pci_make_dev_node);
 
 /*
  * Devices known to require a longer delay before first config space access
diff --git a/include/linux/pci_ids.h b/include/linux/pci_ids.h
index 4cf6aaed5f35..c7e6cd10ac52 100644
--- a/include/linux/pci_ids.h
+++ b/include/linux/pci_ids.h
@@ -2611,6 +2611,9 @@ 
 #define PCI_VENDOR_ID_TEKRAM		0x1de1
 #define PCI_DEVICE_ID_TEKRAM_DC290	0xdc29
 
+#define PCI_VENDOR_ID_RPI		0x1de4
+#define PCI_DEVICE_ID_RPI_RP1_C0	0x0001
+
 #define PCI_VENDOR_ID_ALIBABA		0x1ded
 
 #define PCI_VENDOR_ID_CXL		0x1e98