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Message-ID: <20240821165541.GA254124@bhelgaas>
Date: Wed, 21 Aug 2024 11:55:41 -0500
From: Bjorn Helgaas <helgaas@...nel.org>
To: Andrea della Porta <andrea.porta@...e.com>
Cc: Michael Turquette <mturquette@...libre.com>,
Stephen Boyd <sboyd@...nel.org>, Rob Herring <robh@...nel.org>,
Krzysztof Kozlowski <krzk+dt@...nel.org>,
Conor Dooley <conor+dt@...nel.org>,
Florian Fainelli <florian.fainelli@...adcom.com>,
Broadcom internal kernel review list <bcm-kernel-feedback-list@...adcom.com>,
Linus Walleij <linus.walleij@...aro.org>,
Catalin Marinas <catalin.marinas@....com>,
Will Deacon <will@...nel.org>,
Derek Kiernan <derek.kiernan@....com>,
Dragan Cvetic <dragan.cvetic@....com>,
Arnd Bergmann <arnd@...db.de>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Nicolas Ferre <nicolas.ferre@...rochip.com>,
Claudiu Beznea <claudiu.beznea@...on.dev>,
"David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
Saravana Kannan <saravanak@...gle.com>,
Bjorn Helgaas <bhelgaas@...gle.com>, linux-clk@...r.kernel.org,
devicetree@...r.kernel.org, linux-rpi-kernel@...ts.infradead.org,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
linux-gpio@...r.kernel.org, netdev@...r.kernel.org,
linux-pci@...r.kernel.org, linux-arch@...r.kernel.org,
Lee Jones <lee@...nel.org>, Andrew Lunn <andrew@...n.ch>,
Stefan Wahren <wahrenst@....net>
Subject: Re: [PATCH 08/11] misc: rp1: RaspberryPi RP1 misc driver
On Tue, Aug 20, 2024 at 04:36:10PM +0200, Andrea della Porta wrote:
> The RaspberryPi RP1 is ia PCI multi function device containing
s/ia/a/
> peripherals ranging from Ethernet to USB controller, I2C, SPI
> and others.
Add blank lines between paragraphs.
> Implement a bare minimum driver to operate the RP1, leveraging
> actual OF based driver implementations for the on-borad peripherals
s/on-borad/on-board/
> by loading a devicetree overlay during driver probe.
> The peripherals are accessed by mapping MMIO registers starting
> from PCI BAR1 region.
> As a minimum driver, the peripherals will not be added to the
> dtbo here, but in following patches.
> +config MISC_RP1
> + tristate "RaspberryPi RP1 PCIe support"
> + depends on PCI && PCI_QUIRKS
> + select OF
> + select OF_OVERLAY
> + select IRQ_DOMAIN
> + select PCI_DYNAMIC_OF_NODES
> + help
> + Support for 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.
s/support for/support/
Add blank lines between paragraphs. Consider wrapping to fit in 80
columns. Current width of 86 seems random.
> diff --git a/drivers/misc/rp1/Makefile b/drivers/misc/rp1/Makefile
> new file mode 100644
> index 000000000000..e83854b4ed2c
> --- /dev/null
> +++ b/drivers/misc/rp1/Makefile
> @@ -0,0 +1,3 @@
> +# SPDX-License-Identifier: GPL-2.0-only
> +rp1-pci-objs := rp1-pci.o rp1-pci.dtbo.o
> +obj-$(CONFIG_MISC_RP1) += rp1-pci.o
> diff --git a/drivers/misc/rp1/rp1-pci.c b/drivers/misc/rp1/rp1-pci.c
> new file mode 100644
> index 000000000000..a6093ba7e19a
> --- /dev/null
> +++ b/drivers/misc/rp1/rp1-pci.c
> @@ -0,0 +1,333 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (c) 2018-22 Raspberry Pi Ltd.
s/22/24/ ?
> +#define RP1_B0_CHIP_ID 0x10001927
> +#define RP1_C0_CHIP_ID 0x20001927
Drop; both unused.
> +#define RP1_PLATFORM_ASIC BIT(1)
> +#define RP1_PLATFORM_FPGA BIT(0)
Drop; both unused.
> +#define RP1_SYSCLK_RATE 200000000
> +#define RP1_SYSCLK_FPGA_RATE 60000000
Drop; both unused.
> +enum {
> + SYSINFO_CHIP_ID_OFFSET = 0,
> + SYSINFO_PLATFORM_OFFSET = 4,
> +};
Drop; unused.
> +/* MSIX CFG registers start at 0x8 */
s/MSIX/MSI-X/
> +#define MSIX_CFG_TEST BIT(1)
Unused.
> +#define INTSTATL 0x108
> +#define INTSTATH 0x10c
Drop; both unused.
> +static void dump_bar(struct pci_dev *pdev, unsigned int bar)
> +{
> + dev_info(&pdev->dev,
> + "bar%d len 0x%llx, start 0x%llx, end 0x%llx, flags, 0x%lx\n",
%pR does most of this for you.
> +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;
> + int ret = 0;
> +
> + 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:
> + ret = -EINVAL;
If you "return -EINVAL" directly here, I think you can drop "ret" and
just "return 0" below.
> + break;
> + }
> +
> + return ret;
> +}
> +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) {
> + 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 ret;
if (ret)
return ret;
...
return 0;
would make this easier to read and unindent the normal path.
> + rp1->bar1 = pci_iomap(pdev, 1, 0);
pcim_iomap()
> + if (!rp1->bar1) {
> + dev_err(&pdev->dev, "Cannot map PCI bar\n");
s/bar/BAR/
> +#define PCI_VENDOR_ID_RPI 0x1de4
> +#define PCI_DEVICE_ID_RP1_C0 0x0001
Device ID should include "RPI" as well.
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