Subject: [PATCH v1 2/5] pci: designware: enhancements to support keystone pcie

From: [email-masked] (Murali Karicheri)
Date: Fri, 16 May 2014 18:49:25 -0400

On 5/16/2014 6:15 PM, Kumar Gala wrote:
> On May 15, 2014, at 11:01 AM, Murali Karicheri <[email-masked]> wrote:
>
>> keystone pcie hardware is based on designware hw version 3.65.
>> There is no support for ATU port and has registers in
>> application space to configure inbound/outbound access. Also
>> doesn't support PCI PVM option. The MSI IRQ registers available
>> in application space is used to mask/unmask/enable the MSI IRQs.
>>
>> DW core driver is a set of common functions that are abstracted
>> to support DW pci drivers. To allow re-use of these functions for
>> keystone pci driver, core driver is to be enhanced.
>>
>> Following are done to allow re-use of the functions on keystone pci
>> driver.
>>
>> 1. Some of the variables in pcie_port struct is folded inside
>>     a union that now contains both new DW hw related variables as well
>>     as old hardware related variables such as application reg base.
>> 2. Added a dw_pcie_common_host_init() function that holds common
>>     host initialization code for old and new hw.
>> 3. dw_pcie_parse_resource() is used for parsing resource related
>>     information from DT bindings.
>> 4. dw_pcie_host_init() is called by new DW hw drivers as before.
>>     Added dw_old_pcie_host_init() is it's counter part on old dw hw.
>>     Both these functions now call dw_pcie_common_host_init().
>> 5. Some of the static functions are made global to allow use from
>>     dw old pci drivers such as pci-keystone.
> Can we split this into patches that do these 5 things?
>
> Also, using OLD seems like a bad choice, what happens when we have NEW NEW in the future?
I suggested using a compatibility  that includes v3.65 version string to 
differentiate and treat
the code differently for the dw hw that is used on keystone SoC.

>> CC: Mohit Kumar <[email-masked]>
>> CC: Jingoo Han <[email-masked]>
>> CC: Bjorn Helgaas <[email-masked]>
>> CC: Santosh Shilimkar <[email-masked]>
>>
>> Signed-off-by: Murali Karicheri <[email-masked]>
>> ---
>> drivers/pci/host/pcie-designware.c |  101 ++++++++++++++++++++++++------------
>> drivers/pci/host/pcie-designware.h |   42 ++++++++++++---
>> 2 files changed, 103 insertions(+), 40 deletions(-)
>> diff --git a/drivers/pci/host/pcie-designware.c b/drivers/pci/host/pcie-designware.c
>> index c4e3732..9ea8e79 100644
>> --- a/drivers/pci/host/pcie-designware.c
>> +++ b/drivers/pci/host/pcie-designware.c
>> @@ -277,11 +277,15 @@ static int assign_irq(int no_irqs, struct msi_desc *desc, int *pos)
>> 		}
>> 		set_bit(pos0 + i, pp->msi_irq_in_use);
>> 		/*Enable corresponding interrupt in MSI interrupt controller */
>> -		res = ((pos0 + i) / 32) * 12;
>> -		bit = (pos0 + i) % 32;
>> -		dw_pcie_rd_own_conf(pp, PCIE_MSI_INTR0_ENABLE + res, 4, &val);
>> -		val |= 1 << bit;
>> -		dw_pcie_wr_own_conf(pp, PCIE_MSI_INTR0_ENABLE + res, 4, val);
>> +		if (!(pp->version & DW_VERSION_OLD)) {
>> +			res = ((pos0 + i) / 32) * 12;
>> +			bit = (pos0 + i) % 32;
>> +			dw_pcie_rd_own_conf(pp, PCIE_MSI_INTR0_ENABLE + res,
>> +						 4, &val);
>> +			val |= 1 << bit;
>> +			dw_pcie_wr_own_conf(pp, PCIE_MSI_INTR0_ENABLE + res,
>> +						 4, val);
>> +		}
>> 	}
>>
>> 	*pos = pos0;
>> @@ -349,7 +353,10 @@ static int dw_msi_setup_irq(struct msi_chip *chip, struct pci_dev *pdev,
>> 	 */
>> 	desc->msi_attrib.multiple = msgvec;
>>
>> -	msg.address_lo = virt_to_phys((void *)pp->msi_data);
>> +	if (pp->ops->get_msi_data)
>> +		msg.address_lo = pp->ops->get_msi_data(pp);
>> +	else
>> +		msg.address_lo = virt_to_phys((void *)pp->msi_data);
>> 	msg.address_hi = 0x0;
>> 	msg.data = pos;
>> 	write_msi_msg(irq, &msg);
>> @@ -389,13 +396,11 @@ static const struct irq_domain_ops msi_domain_ops = {
>> 	.map = dw_pcie_msi_map,
>> };
>>
>> -int __init dw_pcie_host_init(struct pcie_port *pp)
>> +int __init dw_pcie_parse_resource(struct pcie_port *pp)
>> {
>> 	struct device_node *np = pp->dev->of_node;
>> -	struct of_pci_range range;
>> 	struct of_pci_range_parser parser;
>> -	u32 val;
>> -	int i;
>> +	struct of_pci_range range;
>>
>> 	if (of_pci_range_parser_init(&parser, np)) {
>> 		dev_err(pp->dev, "missing ranges property\n");
>> @@ -440,23 +445,17 @@ int __init dw_pcie_host_init(struct pcie_port *pp)
>> 			return -ENOMEM;
>> 		}
>> 	}
>> -
>> -	pp->cfg0_base = pp->cfg.start;
>> -	pp->cfg1_base = pp->cfg.start + pp->config.cfg0_size;
>> 	pp->mem_base = pp->mem.start;
>>
>> -	pp->va_cfg0_base = devm_ioremap(pp->dev, pp->cfg0_base,
>> -					pp->config.cfg0_size);
>> -	if (!pp->va_cfg0_base) {
>> -		dev_err(pp->dev, "error with ioremap in function\n");
>> -		return -ENOMEM;
>> -	}
>> -	pp->va_cfg1_base = devm_ioremap(pp->dev, pp->cfg1_base,
>> -					pp->config.cfg1_size);
>> -	if (!pp->va_cfg1_base) {
>> -		dev_err(pp->dev, "error with ioremap\n");
>> -		return -ENOMEM;
>> -	}
>> +	return 0;
>> +}
>> +
>> +int __init dw_pcie_common_host_init(struct pcie_port *pp, struct hw_pci *hw,
>> +				const struct irq_domain_ops *irq_msi_ops)
>> +{
>> +	struct device_node *np = pp->dev->of_node;
>> +	u32 val;
>> +	int i;
>>
>> 	if (of_property_read_u32(np, "num-lanes", &pp->lanes)) {
>> 		dev_err(pp->dev, "Failed to parse the number of lanes\n");
>> @@ -465,7 +464,7 @@ int __init dw_pcie_host_init(struct pcie_port *pp)
>>
>> 	if (IS_ENABLED(CONFIG_PCI_MSI)) {
>> 		pp->irq_domain = irq_domain_add_linear(pp->dev->of_node,
>> -					MAX_MSI_IRQS, &msi_domain_ops,
>> +					MAX_MSI_IRQS, irq_msi_ops,
>> 					&dw_pcie_msi_chip);
>> 		if (!pp->irq_domain) {
>> 			dev_err(pp->dev, "irq domain init failed\n");
>> @@ -488,10 +487,10 @@ int __init dw_pcie_host_init(struct pcie_port *pp)
>> 	val |= PORT_LOGIC_SPEED_CHANGE;
>> 	dw_pcie_wr_own_conf(pp, PCIE_LINK_WIDTH_SPEED_CONTROL, 4, val);
>>
>> -	dw_pci.nr_controllers = 1;
>> -	dw_pci.private_data = (void **)&pp;
>> +	hw->nr_controllers = 1;
>> +	hw->private_data = (void **)&pp;
>>
>> -	pci_common_init_dev(pp->dev, &dw_pci);
>> +	pci_common_init_dev(pp->dev, hw);
>> 	pci_assign_unassigned_resources();
>> #ifdef CONFIG_PCI_DOMAINS
>> 	dw_pci.domain++;
>> @@ -500,6 +499,32 @@ int __init dw_pcie_host_init(struct pcie_port *pp)
>> 	return 0;
>> }
>>
>> +int __init dw_pcie_host_init(struct pcie_port *pp)
>> +{
>> +	int ret;
>> +
>> +	ret = dw_pcie_parse_resource(pp);
>> +	if (ret)
>> +		return ret;
>> +
>> +	pp->cfg0_base = pp->cfg.start;
>> +	pp->cfg1_base = pp->cfg.start + pp->config.cfg0_size;
>> +	pp->va_cfg0_base = devm_ioremap(pp->dev, pp->cfg0_base,
>> +					pp->config.cfg0_size);
>> +	if (!pp->va_cfg0_base) {
>> +		dev_err(pp->dev, "error with ioremap in function\n");
>> +		return -ENOMEM;
>> +	}
>> +	pp->va_cfg1_base = devm_ioremap(pp->dev, pp->cfg1_base,
>> +					pp->config.cfg1_size);
>> +	if (!pp->va_cfg1_base) {
>> +		dev_err(pp->dev, "error with ioremap\n");
>> +		return -ENOMEM;
>> +	}
>> +
>> +	return dw_pcie_common_host_init(pp, &dw_pci, &msi_domain_ops);
>> +}
>> +
>> static void dw_pcie_prog_viewport_cfg0(struct pcie_port *pp, u32 busdev)
>> {
>> 	/* Program viewport 0 : OUTBOUND : CFG0 */
>> @@ -654,7 +679,11 @@ static int dw_pcie_rd_conf(struct pci_bus *bus, u32 devfn, int where,
>>
>> 	spin_lock_irqsave(&pp->conf_lock, flags);
>> 	if (bus->number != pp->root_bus_nr)
>> -		ret = dw_pcie_rd_other_conf(pp, bus, devfn,
>> +		if (pp->ops->rd_other_conf)
>> +			ret = pp->ops->rd_other_conf(pp, bus, devfn,
>> +						where, size, val);
>> +		else
>> +			ret = dw_pcie_rd_other_conf(pp, bus, devfn,
>> 						where, size, val);
>> 	else
>> 		ret = dw_pcie_rd_own_conf(pp, where, size, val);
>> @@ -680,7 +709,11 @@ static int dw_pcie_wr_conf(struct pci_bus *bus, u32 devfn,
>>
>> 	spin_lock_irqsave(&pp->conf_lock, flags);
>> 	if (bus->number != pp->root_bus_nr)
>> -		ret = dw_pcie_wr_other_conf(pp, bus, devfn,
>> +		if (pp->ops->wr_other_conf)
>> +			ret = pp->ops->wr_other_conf(pp, bus, devfn,
>> +						where, size, val);
>> +		else
>> +			ret = dw_pcie_wr_other_conf(pp, bus, devfn,
>> 						where, size, val);
>> 	else
>> 		ret = dw_pcie_wr_own_conf(pp, where, size, val);
>> @@ -694,7 +727,7 @@ static struct pci_ops dw_pcie_ops = {
>> 	.write = dw_pcie_wr_conf,
>> };
>>
>> -static int dw_pcie_setup(int nr, struct pci_sys_data *sys)
>> +int dw_pcie_setup(int nr, struct pci_sys_data *sys)
>> {
>> 	struct pcie_port *pp;
>>
>> @@ -717,7 +750,7 @@ static int dw_pcie_setup(int nr, struct pci_sys_data *sys)
>> 	return 1;
>> }
>>
>> -static struct pci_bus *dw_pcie_scan_bus(int nr, struct pci_sys_data *sys)
>> +struct pci_bus *dw_pcie_scan_bus(int nr, struct pci_sys_data *sys)
>> {
>> 	struct pci_bus *bus;
>> 	struct pcie_port *pp = sys_to_pcie(sys);
>> @@ -746,7 +779,7 @@ static int dw_pcie_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
>> 	return irq;
>> }
>>
>> -static void dw_pcie_add_bus(struct pci_bus *bus)
>> +void dw_pcie_add_bus(struct pci_bus *bus)
>> {
>> 	if (IS_ENABLED(CONFIG_PCI_MSI)) {
>> 		struct pcie_port *pp = sys_to_pcie(bus->sysdata);
>> diff --git a/drivers/pci/host/pcie-designware.h b/drivers/pci/host/pcie-designware.h
>> index 3063b35..e97f4d7 100644
>> --- a/drivers/pci/host/pcie-designware.h
>> +++ b/drivers/pci/host/pcie-designware.h
>> @@ -35,21 +35,39 @@ struct pcie_port {
>> 	struct device		*dev;
>> 	u8			root_bus_nr;
>> 	void __iomem		*dbi_base;
>> -	u64			cfg0_base;
>> -	void __iomem		*va_cfg0_base;
>> -	u64			cfg1_base;
>> -	void __iomem		*va_cfg1_base;
>> +	/*
>> +	 * Old DW version implement application register space for
>> +	 * MSI and has no ATU view port
>> +	 */
>> +#define DW_VERSION_OLD	BIT(0)
>> +	u32			version;
>> +	union {
>> +		/* new dw core specific */
>> +		struct {
>> +			u64		cfg0_base;
>> +			void __iomem	*va_cfg0_base;
>> +			u64		cfg1_base;
>> +			void __iomem	*va_cfg1_base;
>> +			int		msi_irq;
>> +		};
>> +
>> +		/* old dw core specific */
>> +		struct  {
>> +			struct irq_domain	*legacy_irq_domain;
>> +			void __iomem		*va_app_base;
>> +			u64			app_base;
>> +		};
>> +	};
>> 	u64			io_base;
>> 	u64			mem_base;
>> 	spinlock_t		conf_lock;
>> -	struct resource		cfg;
>> 	struct resource		io;
>> 	struct resource		mem;
>> +	struct resource		cfg;
>> 	struct pcie_port_info	config;
>> 	int			irq;
>> 	u32			lanes;
>> 	struct pcie_host_ops	*ops;
>> -	int			msi_irq;
>> 	struct irq_domain	*irq_domain;
>> 	unsigned long		msi_data;
>> 	DECLARE_BITMAP(msi_irq_in_use, MAX_MSI_IRQS);
>> @@ -62,8 +80,13 @@ struct pcie_host_ops {
>> 			u32 val, void __iomem *dbi_base);
>> 	int (*rd_own_conf)(struct pcie_port *pp, int where, int size, u32 *val);
>> 	int (*wr_own_conf)(struct pcie_port *pp, int where, int size, u32 val);
>> +	int (*rd_other_conf)(struct pcie_port *pp, struct pci_bus *bus,
>> +			unsigned int devfn, int where, int size, u32 *val);
>> +	int (*wr_other_conf)(struct pcie_port *pp, struct pci_bus *bus,
>> +			unsigned int devfn, int where, int size, u32 val);
>> 	int (*link_up)(struct pcie_port *pp);
>> 	void (*host_init)(struct pcie_port *pp);
>> +	u32 (*get_msi_data)(struct pcie_port *pp);
>> };
>>
>> int dw_pcie_cfg_read(void __iomem *addr, int where, int size, u32 *val);
>> @@ -73,5 +96,12 @@ void dw_pcie_msi_init(struct pcie_port *pp);
>> int dw_pcie_link_up(struct pcie_port *pp);
>> void dw_pcie_setup_rc(struct pcie_port *pp);
>> int dw_pcie_host_init(struct pcie_port *pp);
>> +int dw_pcie_setup(int nr, struct pci_sys_data *sys);
>> +struct pci_bus *dw_pcie_scan_bus(int nr, struct pci_sys_data *sys);
>> +void dw_pcie_add_bus(struct pci_bus *bus);
>> +int dw_pcie_parse_resource(struct pcie_port *pp);
>>
>> +/* internal to dw core */
>> +int dw_pcie_common_host_init(struct pcie_port *pp, struct hw_pci *hw,
>> +			const struct irq_domain_ops *irq_ops);
>> #endif /* _PCIE_DESIGNWARE_H */
>> -- 
>> 1.7.9.5
>>
>>
>> _______________________________________________
>> linux-arm-kernel mailing list
>> linux-arm-kernel at lists.infradead.org
>> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel