Message-ID: <55BB6B45.7010705@arm.com>
Date:	Fri, 31 Jul 2015 13:34:13 +0100
From:	Marc Zyngier <marc.zyngier@....com>
To:	Ley Foon Tan <lftan@...era.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Russell King <linux@....linux.org.uk>,
	Arnd Bergmann <arnd@...db.de>,
	Dinh Nguyen <dinguyen@...nsource.altera.com>
CC:	devicetree@...r.kernel.org, lftan.linux@...il.com,
	linux-doc@...r.kernel.org, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 2/5] pci:host: Add Altera PCIe host controller driver

On 31/07/15 11:15, Ley Foon Tan wrote:
> This patch adds the Altera PCIe host controller driver.
> 
> Signed-off-by: Ley Foon Tan <lftan@...era.com>
> ---
>  drivers/pci/host/Kconfig       |   8 +
>  drivers/pci/host/Makefile      |   1 +
>  drivers/pci/host/pcie-altera.c | 526 +++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 535 insertions(+)
>  create mode 100644 drivers/pci/host/pcie-altera.c
> 
> diff --git a/drivers/pci/host/Kconfig b/drivers/pci/host/Kconfig
> index 675c2d1..108500a 100644
> --- a/drivers/pci/host/Kconfig
> +++ b/drivers/pci/host/Kconfig
> @@ -145,4 +145,12 @@ config PCIE_IPROC_BCMA
>  	  Say Y here if you want to use the Broadcom iProc PCIe controller
>  	  through the BCMA bus interface
>  
> +config PCIE_ALTERA
> +	tristate "Altera PCIe controller"
> +	depends on ARCH_SOCFPGA
> +	select PCI_MSI_IRQ_DOMAIN if PCI_MSI

Why would you select this here? MSI support is in another driver, so I
don't see the point.

> +	help
> +	  Say Y here if you want to enable PCIe controller support for Altera
> +	  SoCFPGA family of SoCs.
> +
>  endmenu
> diff --git a/drivers/pci/host/Makefile b/drivers/pci/host/Makefile
> index 140d66f..6954f76 100644
> --- a/drivers/pci/host/Makefile
> +++ b/drivers/pci/host/Makefile
> @@ -17,3 +17,4 @@ obj-$(CONFIG_PCI_VERSATILE) += pci-versatile.o
>  obj-$(CONFIG_PCIE_IPROC) += pcie-iproc.o
>  obj-$(CONFIG_PCIE_IPROC_PLATFORM) += pcie-iproc-platform.o
>  obj-$(CONFIG_PCIE_IPROC_BCMA) += pcie-iproc-bcma.o
> +obj-$(CONFIG_PCIE_ALTERA) += pcie-altera.o
> diff --git a/drivers/pci/host/pcie-altera.c b/drivers/pci/host/pcie-altera.c
> new file mode 100644
> index 0000000..3ec51c7
> --- /dev/null
> +++ b/drivers/pci/host/pcie-altera.c
> @@ -0,0 +1,526 @@
> +/*
> + * Copyright Altera Corporation (C) 2013-2015. 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 <http://www.gnu.org/licenses/>.
> + */
> +#include <linux/interrupt.h>
> +#include <linux/module.h>
> +#include <linux/of_address.h>
> +#include <linux/of_irq.h>
> +#include <linux/of_pci.h>
> +#include <linux/pci.h>
> +#include <linux/platform_device.h>
> +#include <linux/slab.h>
> +
> +#define A2P_ADDR_MAP_LO0		0x1000
> +#define A2P_ADDR_MAP_HI0		0x1004
> +#define RP_TX_REG0			0x2000
> +#define RP_TX_REG1			0x2004
> +#define RP_TX_CNTRL			0x2008
> +#define RP_TX_EOP			0x2
> +#define RP_TX_SOP			0x1
> +#define RP_RXCPL_STATUS		0x2010
> +#define RP_RXCPL_EOP			0x2
> +#define RP_RXCPL_SOP			0x1
> +#define RP_RXCPL_REG0			0x2014
> +#define RP_RXCPL_REG1			0x2018
> +#define P2A_INT_STATUS			0x3060
> +#define P2A_INT_STS_ALL			0xF
> +#define P2A_INT_ENABLE			0x3070
> +#define P2A_INT_ENA_ALL			0xF
> +#define RP_LTSSM			0x3C64
> +#define LTSSM_L0			0xF
> +
> +/* TLP configuration type 0 and 1 */
> +#define TLP_FMTTYPE_CFGRD0		0x04	/* Configuration Read Type 0 */
> +#define TLP_FMTTYPE_CFGWR0		0x44	/* Configuration Write Type 0 */
> +#define TLP_FMTTYPE_CFGRD1		0x05	/* Configuration Read Type 1 */
> +#define TLP_FMTTYPE_CFGWR1		0x45	/* Configuration Write Type 1 */
> +#define TLP_PAYLOAD_SIZE		0x01
> +#define TLP_READ_TAG			0x1D
> +#define TLP_WRITE_TAG			0x10
> +#define TLP_CFG_DW0(fmttype)		(((fmttype) << 24) | TLP_PAYLOAD_SIZE)
> +#define TLP_CFG_DW1(reqid, tag)		(((reqid) << 16) | (tag << 8) | 0xF)
> +#define TLP_CFG_DW2(bus, devfn, offset)	\
> +				(((bus) << 24) | ((devfn) << 16) | (offset))
> +#define TLP_REQ_ID(bus, devfn)		(((bus) << 8) | (devfn))
> +#define TLP_COMPL_STATUS(hdr)		(((hdr) & 0xE0) >> 13)
> +#define TLP_HDR_SIZE			3
> +#define TLP_LOOP			10
> +
> +#define INTX_NUM		4
> +
> +/* Address translation table entry size */
> +#define ATT_ENTRY_SIZE		8
> +
> +#define DWORD_MASK		3
> +
> +struct altera_pcie {
> +	struct platform_device	*pdev;
> +	struct resource		*txs;
> +	void __iomem		*cra_base;
> +	int			hwirq;
> +	u8			root_bus_nr;
> +	struct irq_domain		*irq_domain;
> +	struct resource		bus_range;
> +	struct list_head		resources;
> +};
> +
> +struct tlp_rp_regpair_t {
> +	u32 ctrl;
> +	u32 reg0;
> +	u32 reg1;
> +};
> +
> +static void altera_pcie_retrain(struct pci_dev *dev)
> +{
> +	u16 linkcap, linkstat;
> +
> +	/*
> +	 * Set the retrain bit if the PCIe rootport support > 2.5GB/s, but
> +	 * current speed is 2.5 GB/s.
> +	 */
> +	pcie_capability_read_word(dev, PCI_EXP_LNKCAP, &linkcap);
> +
> +	if ((linkcap & PCI_EXP_LNKCAP_SLS) <= PCI_EXP_LNKCAP_SLS_2_5GB)
> +		return;
> +
> +	pcie_capability_read_word(dev, PCI_EXP_LNKSTA, &linkstat);
> +	if ((linkstat & PCI_EXP_LNKSTA_CLS) == PCI_EXP_LNKSTA_CLS_2_5GB)
> +		pcie_capability_set_word(dev, PCI_EXP_LNKCTL,
> +					PCI_EXP_LNKCTL_RL);
> +
> +}
> +DECLARE_PCI_FIXUP_EARLY(PCI_ANY_ID, PCI_ANY_ID, altera_pcie_retrain);
> +
> +static inline void cra_writel(struct altera_pcie *pcie, u32 value, u32 reg)
> +{
> +	writel_relaxed(value, pcie->cra_base + reg);
> +}
> +
> +static inline u32 cra_readl(struct altera_pcie *pcie, u32 reg)
> +{
> +	return readl_relaxed(pcie->cra_base + reg);
> +}
> +
> +static void tlp_read_rx(struct altera_pcie *pcie,
> +			struct tlp_rp_regpair_t *tlp_rp_regdata)
> +{
> +	tlp_rp_regdata->ctrl = cra_readl(pcie, RP_RXCPL_STATUS);
> +	tlp_rp_regdata->reg0 = cra_readl(pcie, RP_RXCPL_REG0);
> +	tlp_rp_regdata->reg1 = cra_readl(pcie, RP_RXCPL_REG1);
> +}
> +
> +static void tlp_write_tx(struct altera_pcie *pcie,
> +			struct tlp_rp_regpair_t *tlp_rp_regdata)
> +{
> +	cra_writel(pcie, tlp_rp_regdata->reg0, RP_TX_REG0);
> +	cra_writel(pcie, tlp_rp_regdata->reg1, RP_TX_REG1);
> +	cra_writel(pcie, tlp_rp_regdata->ctrl, RP_TX_CNTRL);
> +}
> +
> +static bool altera_pcie_link_is_up(struct altera_pcie *pcie)
> +{
> +	return !!(cra_readl(pcie, RP_LTSSM) & LTSSM_L0);
> +}
> +
> +static bool altera_pcie_valid_config(struct altera_pcie *pcie,
> +				struct pci_bus *bus, int dev)
> +{
> +	/* If there is no link, then there is no device */
> +	if (bus->number != pcie->root_bus_nr) {
> +		if (!altera_pcie_link_is_up(pcie))
> +			return false;
> +	}
> +
> +	/* access only one slot on each root port */
> +	if (bus->number == pcie->root_bus_nr && dev > 0)
> +		return false;
> +
> +	/*
> +	 * Do not read more than one device on the bus directly attached
> +	 * to RC.
> +	 */
> +	if (bus->primary == pcie->root_bus_nr && dev > 0)
> +		return false;
> +
> +	 return true;
> +}
> +
> +static int tlp_read_packet(struct altera_pcie *pcie, u32 *value)
> +{
> +	u8 loop;
> +	struct tlp_rp_regpair_t tlp_rp_regdata;
> +
> +	for (loop = TLP_LOOP; loop > 0; loop--) {
> +		tlp_read_rx(pcie, &tlp_rp_regdata);
> +		if (tlp_rp_regdata.ctrl & RP_RXCPL_EOP) {
> +			if (value)
> +				*value = tlp_rp_regdata.reg0;
> +			return PCIBIOS_SUCCESSFUL;
> +		}
> +	}
> +
> +	return -ENOENT;
> +}
> +
> +static void tlp_write_packet(struct altera_pcie *pcie, u32 *headers, u32 data)
> +{
> +	struct tlp_rp_regpair_t tlp_rp_regdata;
> +
> +	tlp_rp_regdata.reg0 = headers[0];
> +	tlp_rp_regdata.reg1 = headers[1];
> +	tlp_rp_regdata.ctrl = RP_TX_SOP;
> +	tlp_write_tx(pcie, &tlp_rp_regdata);
> +
> +	tlp_rp_regdata.reg0 = headers[2];
> +	tlp_rp_regdata.reg1 = data;
> +	tlp_rp_regdata.ctrl = RP_TX_EOP;
> +	tlp_write_tx(pcie, &tlp_rp_regdata);
> +}
> +
> +static int tlp_cfg_dword_read(struct altera_pcie *pcie, u8 bus, u32 devfn,
> +			      int where, u32 *value)
> +{
> +	int ret;
> +	u32 headers[TLP_HDR_SIZE];
> +
> +	if (bus == pcie->root_bus_nr)
> +		headers[0] = TLP_CFG_DW0(TLP_FMTTYPE_CFGRD0);
> +	else
> +		headers[0] = TLP_CFG_DW0(TLP_FMTTYPE_CFGRD1);
> +
> +	headers[1] = TLP_CFG_DW1(TLP_REQ_ID(pcie->root_bus_nr, devfn),
> +					TLP_READ_TAG);
> +	headers[2] = TLP_CFG_DW2(bus, devfn, where);
> +
> +	tlp_write_packet(pcie, headers, 0);
> +
> +	ret = tlp_read_packet(pcie, value);
> +	if (ret)
> +		*value = ~0UL;	/* return 0xFFFFFFFF if error */
> +
> +	return ret;
> +}
> +
> +static int tlp_cfg_dword_write(struct altera_pcie *pcie, u8 bus, u32 devfn,
> +			       int where, u32 value)
> +{
> +	u32 headers[TLP_HDR_SIZE];
> +
> +	if (bus == pcie->root_bus_nr)
> +		headers[0] = TLP_CFG_DW0(TLP_FMTTYPE_CFGWR0);
> +	else
> +		headers[0] = TLP_CFG_DW0(TLP_FMTTYPE_CFGWR1);
> +
> +	headers[1] = TLP_CFG_DW1(TLP_REQ_ID(pcie->root_bus_nr, devfn),
> +					TLP_WRITE_TAG);
> +	headers[2] = TLP_CFG_DW2(bus, devfn, where);
> +
> +	tlp_write_packet(pcie, headers, value);
> +
> +	tlp_read_packet(pcie, NULL);
> +
> +	/* Keep an eye out for changes to the root bus number */
> +	if ((bus == pcie->root_bus_nr) && (where == PCI_PRIMARY_BUS))
> +		pcie->root_bus_nr = (u8)(value);
> +
> +	return PCIBIOS_SUCCESSFUL;
> +}
> +
> +static int altera_pcie_cfg_read(struct pci_bus *bus, unsigned int devfn,
> +			       int where, int size, u32 *value)
> +{
> +	struct altera_pcie *pcie = bus->sysdata;
> +	int ret;
> +
> +	if (!altera_pcie_valid_config(pcie, bus, PCI_SLOT(devfn))) {
> +		*value = ~0UL;
> +		return PCIBIOS_DEVICE_NOT_FOUND;
> +	}
> +
> +	ret = tlp_cfg_dword_read(pcie, bus->number, devfn,
> +		(where & ~DWORD_MASK), value);
> +	if (ret != PCIBIOS_SUCCESSFUL)
> +		return ret;
> +
> +	if (size == 1)
> +		*value = (*value >> (8 * (where & 0x3))) & 0xff;
> +	else if (size == 2)
> +		*value = (*value >> (8 * (where & 0x2))) & 0xffff;
> +
> +	return PCIBIOS_SUCCESSFUL;
> +}
> +
> +static int altera_pcie_cfg_write(struct pci_bus *bus, unsigned int devfn,
> +				int where, int size, u32 value)
> +{
> +	struct altera_pcie *pcie = bus->sysdata;
> +	u32 data32 = value;
> +	u32 shift = 8 * (where & 3);
> +	int ret;
> +
> +	if (!altera_pcie_valid_config(pcie, bus, PCI_SLOT(devfn)))
> +		return PCIBIOS_DEVICE_NOT_FOUND;
> +
> +	/* write partial */
> +	if (size != sizeof(u32)) {
> +		ret = tlp_cfg_dword_read(pcie, bus->number, devfn,
> +			where & ~DWORD_MASK, &data32);
> +		if (ret)
> +			return ret;
> +
> +		if (size == 2)
> +			data32 = (data32 & ~(0xffff << shift)) |
> +					((value & 0xffff) << shift);
> +		 else if (size == 1)
> +			data32 = (data32 & ~(0xff << shift)) |
> +					((value & 0xff) << shift);
> +	}
> +
> +	return tlp_cfg_dword_write(pcie, bus->number, devfn,
> +		(where & ~DWORD_MASK), data32);
> +}
> +
> +static struct pci_ops altera_pcie_ops = {
> +	.read = altera_pcie_cfg_read,
> +	.write = altera_pcie_cfg_write,
> +};
> +
> +static int altera_pcie_intx_map(struct irq_domain *domain, unsigned int irq,
> +				irq_hw_number_t hwirq)
> +{
> +	irq_set_chip_and_handler(irq, &dummy_irq_chip, handle_simple_irq);
> +	irq_set_chip_data(irq, domain->host_data);
> +	set_irq_flags(irq, IRQF_VALID);
> +
> +	return 0;
> +}
> +
> +static const struct irq_domain_ops intx_domain_ops = {
> +	.map = altera_pcie_intx_map,
> +};
> +
> +static irqreturn_t altera_pcie_isr(int irq, void *arg)
> +{
> +	struct altera_pcie *pcie = arg;
> +	u32 status, i;
> +
> +	status = cra_readl(pcie, P2A_INT_STATUS) & P2A_INT_STS_ALL;
> +
> +	/* clear interrupts */
> +	cra_writel(pcie, status, P2A_INT_STATUS);
> +
> +	for (i = 0; i < INTX_NUM; i++) {
> +		if (status & (1 << i))

find_first/next_set_bit?

> +			generic_handle_irq(irq_find_mapping(pcie->irq_domain,
> +							i + 1));

Rule of thumb: if you're calling generic_handle_irq from an interrupt
handler, this is a chained IRQ controller. Please implement it as such.

> +	}
> +
> +	return IRQ_HANDLED;
> +}
> +
> +static void altera_pcie_release_of_pci_ranges(struct altera_pcie *pcie)
> +{
> +	pci_free_resource_list(&pcie->resources);
> +}
> +
> +static int altera_pcie_parse_request_of_pci_ranges(struct altera_pcie *pcie)
> +{
> +	int err, res_valid = 0;
> +	struct device *dev = &pcie->pdev->dev;
> +	struct device_node *np = dev->of_node;
> +	resource_size_t iobase;
> +	struct resource_entry *win;
> +	int offset = 0;
> +
> +	err = of_pci_get_host_bridge_resources(np, 0, 0xff, &pcie->resources,
> +					       &iobase);
> +	if (err)
> +		return err;
> +
> +	resource_list_for_each_entry(win, &pcie->resources) {
> +		struct resource *parent, *res = win->res;
> +
> +		switch (resource_type(res)) {
> +		case IORESOURCE_MEM:
> +			parent = &iomem_resource;
> +			res_valid |= !(res->flags & IORESOURCE_PREFETCH);
> +			cra_writel(pcie, res->start,
> +				A2P_ADDR_MAP_LO0 + offset);
> +			cra_writel(pcie, 0,
> +				A2P_ADDR_MAP_HI0 + offset);
> +			offset += ATT_ENTRY_SIZE;
> +			break;
> +		default:
> +			continue;
> +		}
> +
> +		err = devm_request_resource(dev, parent, res);
> +		if (err)
> +			goto out_release_res;
> +	}
> +
> +	if (!res_valid) {
> +		dev_err(dev, "non-prefetchable memory resource required\n");
> +		err = -EINVAL;
> +		goto out_release_res;
> +	}
> +
> +	return 0;
> +
> +out_release_res:
> +	altera_pcie_release_of_pci_ranges(pcie);
> +	return err;
> +}
> +
> +static void altera_pcie_free_irq_domain(struct altera_pcie *pcie)
> +{
> +	int i;
> +	u32 irq;
> +
> +	for (i = 0; i < INTX_NUM; i++) {
> +		irq = irq_find_mapping(pcie->irq_domain, i);
> +		if (irq > 0)
> +			irq_dispose_mapping(irq);
> +	}
> +
> +	irq_domain_remove(pcie->irq_domain);
> +}
> +
> +static int altera_pcie_init_irq_domain(struct altera_pcie *pcie)
> +{
> +	struct device *dev = &pcie->pdev->dev;
> +	struct device_node *node = dev->of_node;
> +
> +	/* Setup INTx */
> +	pcie->irq_domain = irq_domain_add_linear(node, INTX_NUM,
> +					&intx_domain_ops, pcie);
> +	if (!pcie->irq_domain) {
> +		dev_err(dev, "Failed to get a INTx IRQ domain\n");
> +		return PTR_ERR(pcie->irq_domain);
> +	}
> +
> +	return 0;
> +}
> +
> +static int altera_pcie_parse_dt(struct altera_pcie *pcie)
> +{
> +	struct resource *cra;
> +	int ret;
> +	struct platform_device *pdev = pcie->pdev;
> +
> +	cra = platform_get_resource_byname(pdev, IORESOURCE_MEM, "Cra");
> +	pcie->cra_base = devm_ioremap_resource(&pdev->dev, cra);
> +	if (IS_ERR(pcie->cra_base)) {
> +		dev_err(&pdev->dev, "get Cra resource failed\n");
> +		return PTR_ERR(pcie->cra_base);
> +	}
> +
> +	/* setup IRQ */
> +	pcie->hwirq = platform_get_irq(pdev, 0);
> +	if (pcie->hwirq <= 0) {

This is definitely not a hardware interrupt number. It is completely
virtual. I suggest you give it a better name.

> +		dev_err(&pdev->dev, "failed to get IRQ: %d\n", pcie->hwirq);
> +		return -EINVAL;
> +	}
> +	ret = devm_request_irq(&pdev->dev, pcie->hwirq, altera_pcie_isr,
> +			IRQF_SHARED, pdev->name, pcie);

You're implementing a cascading interrupt controller again. Please fix
it just like you did for your MSI support.

> +
> +	if (ret) {
> +		dev_err(&pdev->dev, "failed to request irq %d\n", pcie->hwirq);
> +		return ret;
> +	}
> +
> +	return 0;
> +}
> +
> +static int altera_pcie_probe(struct platform_device *pdev)
> +{
> +	struct altera_pcie *pcie;
> +	struct pci_bus *bus;
> +	int ret;
> +
> +	pcie = devm_kzalloc(&pdev->dev, sizeof(*pcie), GFP_KERNEL);
> +	if (!pcie)
> +		return -ENOMEM;
> +
> +	pcie->pdev = pdev;
> +
> +	ret = altera_pcie_parse_dt(pcie);
> +	if (ret) {
> +		dev_err(&pdev->dev, "Parsing DT failed\n");
> +		return ret;
> +	}
> +
> +	INIT_LIST_HEAD(&pcie->resources);
> +
> +	ret = altera_pcie_parse_request_of_pci_ranges(pcie);
> +	if (ret) {
> +		dev_err(&pdev->dev, "Failed add resources\n");
> +		return ret;
> +	}
> +
> +	ret = altera_pcie_init_irq_domain(pcie);
> +	if (ret) {
> +		dev_err(&pdev->dev, "Failed creating IRQ Domain\n");
> +		return ret;
> +	}
> +
> +	pcie->root_bus_nr = 0;
> +
> +	/* clear all interrupts */
> +	cra_writel(pcie, P2A_INT_STS_ALL, P2A_INT_STATUS);
> +	/* enable all interrupts */
> +	cra_writel(pcie, P2A_INT_ENA_ALL, P2A_INT_ENABLE);
> +
> +	bus = pci_scan_root_bus(&pdev->dev, pcie->root_bus_nr, &altera_pcie_ops,
> +					pcie, &pcie->resources);
> +	if (!bus)
> +		return -ENOMEM;
> +
> +	pci_assign_unassigned_bus_resources(bus);
> +	pci_bus_add_devices(bus);
> +
> +	platform_set_drvdata(pdev, pcie);
> +	return ret;
> +}
> +
> +static int __exit altera_pcie_remove(struct platform_device *pdev)
> +{
> +	struct altera_pcie *pcie = platform_get_drvdata(pdev);
> +
> +	altera_pcie_free_irq_domain(pcie);
> +	platform_set_drvdata(pdev, NULL);
> +	return 0;
> +}
> +
> +static const struct of_device_id altera_pcie_of_match[] = {
> +	{ .compatible = "altr,pcie-root-port-1.0", },
> +	{},
> +};
> +MODULE_DEVICE_TABLE(of, altera_pcie_of_match);
> +
> +static struct platform_driver altera_pcie_driver = {
> +	.probe		= altera_pcie_probe,
> +	.remove		= altera_pcie_remove,
> +	.driver = {
> +		.name	= "altera-pcie",
> +		.of_match_table = altera_pcie_of_match,
> +	},
> +};
> +
> +module_platform_driver(altera_pcie_driver);
> +
> +MODULE_AUTHOR("Ley Foon Tan <lftan@...era.com>");
> +MODULE_DESCRIPTION("Altera PCIe host controller driver");
> +MODULE_LICENSE("GPL v2");
> 


-- 
Jazz is not dead. It just smells funny...
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