Re: [PATCHv2 2/3] PCI: mvebu: Convert to PCI emulated bridge config space

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On Tue, Sep 18, 2018 at 05:17:45PM +0100, Lorenzo Pieralisi wrote:
> On Wed, Sep 12, 2018 at 05:48:30PM +0200, Thomas Petazzoni wrote:
> > This commit convers the pci-mvebu driver to use the recently
> 
> Nits:
> 
> s/convers/converts
> 
> Actually I would just write "Convert the pci-mvebu....".
> 
> I would drop "recently introduced", unless we can define a precise
> commit when code was added so that it can actually be checked (I know
> you can't since the relevant patch is part of this series and not in
> the mainline yet).
> 
> Bjorn posted some guidelines that are helpful:
> 
> https://marc.info/?l=linux-pci&m=150905742808166&w=2
> 
> I can make these changes myself, no problem but please address Russell's
> comment so that we can proceed.

Hi Thomas,

I understand you have more important things to think about these days :)
(congratulations), let me know if I can fix this patch up myself, I
would like to merge this series for v4.20.

Thanks,
Lorenzo

> 
> Thanks,
> Lorenzo
> 
> > introduced pci-bridge-emul logic, that helps emulating a root port PCI
> > bridge configuration space.
> > 
> > It has been tested on Armada GP XP, with a E1000E NIC.
> > 
> > Signed-off-by: Thomas Petazzoni <thomas.petazzoni@xxxxxxxxxxx>
> > ---
> >  drivers/pci/controller/Kconfig     |   1 +
> >  drivers/pci/controller/pci-mvebu.c | 375 +++++++++++--------------------------
> >  2 files changed, 107 insertions(+), 269 deletions(-)
> > 
> > diff --git a/drivers/pci/controller/Kconfig b/drivers/pci/controller/Kconfig
> > index 028b287466fb..6d0f9930be7f 100644
> > --- a/drivers/pci/controller/Kconfig
> > +++ b/drivers/pci/controller/Kconfig
> > @@ -9,6 +9,7 @@ config PCI_MVEBU
> >  	depends on MVEBU_MBUS
> >  	depends on ARM
> >  	depends on OF
> > +	select PCI_BRIDGE_EMUL
> >  
> >  config PCI_AARDVARK
> >  	bool "Aardvark PCIe controller"
> > diff --git a/drivers/pci/controller/pci-mvebu.c b/drivers/pci/controller/pci-mvebu.c
> > index 50eb0729385b..f97f48cf2bf6 100644
> > --- a/drivers/pci/controller/pci-mvebu.c
> > +++ b/drivers/pci/controller/pci-mvebu.c
> > @@ -22,6 +22,7 @@
> >  #include <linux/of_platform.h>
> >  
> >  #include "../pci.h"
> > +#include "../pci-bridge-emul.h"
> >  
> >  /*
> >   * PCIe unit register offsets.
> > @@ -63,61 +64,6 @@
> >  #define PCIE_DEBUG_CTRL         0x1a60
> >  #define  PCIE_DEBUG_SOFT_RESET		BIT(20)
> >  
> > -enum {
> > -	PCISWCAP = PCI_BRIDGE_CONTROL + 2,
> > -	PCISWCAP_EXP_LIST_ID	= PCISWCAP + PCI_CAP_LIST_ID,
> > -	PCISWCAP_EXP_DEVCAP	= PCISWCAP + PCI_EXP_DEVCAP,
> > -	PCISWCAP_EXP_DEVCTL	= PCISWCAP + PCI_EXP_DEVCTL,
> > -	PCISWCAP_EXP_LNKCAP	= PCISWCAP + PCI_EXP_LNKCAP,
> > -	PCISWCAP_EXP_LNKCTL	= PCISWCAP + PCI_EXP_LNKCTL,
> > -	PCISWCAP_EXP_SLTCAP	= PCISWCAP + PCI_EXP_SLTCAP,
> > -	PCISWCAP_EXP_SLTCTL	= PCISWCAP + PCI_EXP_SLTCTL,
> > -	PCISWCAP_EXP_RTCTL	= PCISWCAP + PCI_EXP_RTCTL,
> > -	PCISWCAP_EXP_RTSTA	= PCISWCAP + PCI_EXP_RTSTA,
> > -	PCISWCAP_EXP_DEVCAP2	= PCISWCAP + PCI_EXP_DEVCAP2,
> > -	PCISWCAP_EXP_DEVCTL2	= PCISWCAP + PCI_EXP_DEVCTL2,
> > -	PCISWCAP_EXP_LNKCAP2	= PCISWCAP + PCI_EXP_LNKCAP2,
> > -	PCISWCAP_EXP_LNKCTL2	= PCISWCAP + PCI_EXP_LNKCTL2,
> > -	PCISWCAP_EXP_SLTCAP2	= PCISWCAP + PCI_EXP_SLTCAP2,
> > -	PCISWCAP_EXP_SLTCTL2	= PCISWCAP + PCI_EXP_SLTCTL2,
> > -};
> > -
> > -/* PCI configuration space of a PCI-to-PCI bridge */
> > -struct mvebu_sw_pci_bridge {
> > -	u16 vendor;
> > -	u16 device;
> > -	u16 command;
> > -	u16 status;
> > -	u16 class;
> > -	u8 interface;
> > -	u8 revision;
> > -	u8 bist;
> > -	u8 header_type;
> > -	u8 latency_timer;
> > -	u8 cache_line_size;
> > -	u32 bar[2];
> > -	u8 primary_bus;
> > -	u8 secondary_bus;
> > -	u8 subordinate_bus;
> > -	u8 secondary_latency_timer;
> > -	u8 iobase;
> > -	u8 iolimit;
> > -	u16 secondary_status;
> > -	u16 membase;
> > -	u16 memlimit;
> > -	u16 iobaseupper;
> > -	u16 iolimitupper;
> > -	u32 romaddr;
> > -	u8 intline;
> > -	u8 intpin;
> > -	u16 bridgectrl;
> > -
> > -	/* PCI express capability */
> > -	u32 pcie_sltcap;
> > -	u16 pcie_devctl;
> > -	u16 pcie_rtctl;
> > -};
> > -
> >  struct mvebu_pcie_port;
> >  
> >  /* Structure representing all PCIe interfaces */
> > @@ -153,7 +99,7 @@ struct mvebu_pcie_port {
> >  	struct clk *clk;
> >  	struct gpio_desc *reset_gpio;
> >  	char *reset_name;
> > -	struct mvebu_sw_pci_bridge bridge;
> > +	struct pci_bridge_emul bridge;
> >  	struct device_node *dn;
> >  	struct mvebu_pcie *pcie;
> >  	struct mvebu_pcie_window memwin;
> > @@ -415,11 +361,12 @@ static void mvebu_pcie_set_window(struct mvebu_pcie_port *port,
> >  static void mvebu_pcie_handle_iobase_change(struct mvebu_pcie_port *port)
> >  {
> >  	struct mvebu_pcie_window desired = {};
> > +	struct pci_bridge_emul_conf *conf = &port->bridge.conf;
> >  
> >  	/* Are the new iobase/iolimit values invalid? */
> > -	if (port->bridge.iolimit < port->bridge.iobase ||
> > -	    port->bridge.iolimitupper < port->bridge.iobaseupper ||
> > -	    !(port->bridge.command & PCI_COMMAND_IO)) {
> > +	if (conf->iolimit < conf->iobase ||
> > +	    conf->iolimitupper < conf->iobaseupper ||
> > +	    !(conf->command & PCI_COMMAND_IO)) {
> >  		mvebu_pcie_set_window(port, port->io_target, port->io_attr,
> >  				      &desired, &port->iowin);
> >  		return;
> > @@ -438,11 +385,11 @@ static void mvebu_pcie_handle_iobase_change(struct mvebu_pcie_port *port)
> >  	 * specifications. iobase is the bus address, port->iowin_base
> >  	 * is the CPU address.
> >  	 */
> > -	desired.remap = ((port->bridge.iobase & 0xF0) << 8) |
> > -			(port->bridge.iobaseupper << 16);
> > +	desired.remap = ((conf->iobase & 0xF0) << 8) |
> > +			(conf->iobaseupper << 16);
> >  	desired.base = port->pcie->io.start + desired.remap;
> > -	desired.size = ((0xFFF | ((port->bridge.iolimit & 0xF0) << 8) |
> > -			 (port->bridge.iolimitupper << 16)) -
> > +	desired.size = ((0xFFF | ((conf->iolimit & 0xF0) << 8) |
> > +			 (conf->iolimitupper << 16)) -
> >  			desired.remap) +
> >  		       1;
> >  
> > @@ -453,10 +400,11 @@ static void mvebu_pcie_handle_iobase_change(struct mvebu_pcie_port *port)
> >  static void mvebu_pcie_handle_membase_change(struct mvebu_pcie_port *port)
> >  {
> >  	struct mvebu_pcie_window desired = {.remap = MVEBU_MBUS_NO_REMAP};
> > +	struct pci_bridge_emul_conf *conf = &port->bridge.conf;
> >  
> >  	/* Are the new membase/memlimit values invalid? */
> > -	if (port->bridge.memlimit < port->bridge.membase ||
> > -	    !(port->bridge.command & PCI_COMMAND_MEMORY)) {
> > +	if (conf->memlimit < conf->membase ||
> > +	    !(conf->command & PCI_COMMAND_MEMORY)) {
> >  		mvebu_pcie_set_window(port, port->mem_target, port->mem_attr,
> >  				      &desired, &port->memwin);
> >  		return;
> > @@ -468,130 +416,34 @@ static void mvebu_pcie_handle_membase_change(struct mvebu_pcie_port *port)
> >  	 * window to setup, according to the PCI-to-PCI bridge
> >  	 * specifications.
> >  	 */
> > -	desired.base = ((port->bridge.membase & 0xFFF0) << 16);
> > -	desired.size = (((port->bridge.memlimit & 0xFFF0) << 16) | 0xFFFFF) -
> > +	desired.base = ((conf->membase & 0xFFF0) << 16);
> > +	desired.size = (((conf->memlimit & 0xFFF0) << 16) | 0xFFFFF) -
> >  		       desired.base + 1;
> >  
> >  	mvebu_pcie_set_window(port, port->mem_target, port->mem_attr, &desired,
> >  			      &port->memwin);
> >  }
> >  
> > -/*
> > - * Initialize the configuration space of the PCI-to-PCI bridge
> > - * associated with the given PCIe interface.
> > - */
> > -static void mvebu_sw_pci_bridge_init(struct mvebu_pcie_port *port)
> > +static pci_bridge_emul_read_status_t
> > +mvebu_pci_bridge_emul_pcie_conf_read(struct pci_bridge_emul *bridge,
> > +				     int reg, u32 *value)
> >  {
> > -	struct mvebu_sw_pci_bridge *bridge = &port->bridge;
> > -
> > -	memset(bridge, 0, sizeof(struct mvebu_sw_pci_bridge));
> > -
> > -	bridge->class = PCI_CLASS_BRIDGE_PCI;
> > -	bridge->vendor = PCI_VENDOR_ID_MARVELL;
> > -	bridge->device = mvebu_readl(port, PCIE_DEV_ID_OFF) >> 16;
> > -	bridge->revision = mvebu_readl(port, PCIE_DEV_REV_OFF) & 0xff;
> > -	bridge->header_type = PCI_HEADER_TYPE_BRIDGE;
> > -	bridge->cache_line_size = 0x10;
> > -
> > -	/* We support 32 bits I/O addressing */
> > -	bridge->iobase = PCI_IO_RANGE_TYPE_32;
> > -	bridge->iolimit = PCI_IO_RANGE_TYPE_32;
> > -
> > -	/* Add capabilities */
> > -	bridge->status = PCI_STATUS_CAP_LIST;
> > -}
> > -
> > -/*
> > - * Read the configuration space of the PCI-to-PCI bridge associated to
> > - * the given PCIe interface.
> > - */
> > -static int mvebu_sw_pci_bridge_read(struct mvebu_pcie_port *port,
> > -				  unsigned int where, int size, u32 *value)
> > -{
> > -	struct mvebu_sw_pci_bridge *bridge = &port->bridge;
> > -
> > -	switch (where & ~3) {
> > -	case PCI_VENDOR_ID:
> > -		*value = bridge->device << 16 | bridge->vendor;
> > -		break;
> > -
> > -	case PCI_COMMAND:
> > -		*value = bridge->command | bridge->status << 16;
> > -		break;
> > -
> > -	case PCI_CLASS_REVISION:
> > -		*value = bridge->class << 16 | bridge->interface << 8 |
> > -			 bridge->revision;
> > -		break;
> > -
> > -	case PCI_CACHE_LINE_SIZE:
> > -		*value = bridge->bist << 24 | bridge->header_type << 16 |
> > -			 bridge->latency_timer << 8 | bridge->cache_line_size;
> > -		break;
> > -
> > -	case PCI_BASE_ADDRESS_0 ... PCI_BASE_ADDRESS_1:
> > -		*value = bridge->bar[((where & ~3) - PCI_BASE_ADDRESS_0) / 4];
> > -		break;
> > -
> > -	case PCI_PRIMARY_BUS:
> > -		*value = (bridge->secondary_latency_timer << 24 |
> > -			  bridge->subordinate_bus         << 16 |
> > -			  bridge->secondary_bus           <<  8 |
> > -			  bridge->primary_bus);
> > -		break;
> > -
> > -	case PCI_IO_BASE:
> > -		if (!mvebu_has_ioport(port))
> > -			*value = bridge->secondary_status << 16;
> > -		else
> > -			*value = (bridge->secondary_status << 16 |
> > -				  bridge->iolimit          <<  8 |
> > -				  bridge->iobase);
> > -		break;
> > -
> > -	case PCI_MEMORY_BASE:
> > -		*value = (bridge->memlimit << 16 | bridge->membase);
> > -		break;
> > -
> > -	case PCI_PREF_MEMORY_BASE:
> > -		*value = 0;
> > -		break;
> > -
> > -	case PCI_IO_BASE_UPPER16:
> > -		*value = (bridge->iolimitupper << 16 | bridge->iobaseupper);
> > -		break;
> > -
> > -	case PCI_CAPABILITY_LIST:
> > -		*value = PCISWCAP;
> > -		break;
> > +	struct mvebu_pcie_port *port = bridge->data;
> >  
> > -	case PCI_ROM_ADDRESS1:
> > -		*value = 0;
> > -		break;
> > -
> > -	case PCI_INTERRUPT_LINE:
> > -		/* LINE PIN MIN_GNT MAX_LAT */
> > -		*value = 0;
> > -		break;
> > -
> > -	case PCISWCAP_EXP_LIST_ID:
> > -		/* Set PCIe v2, root port, slot support */
> > -		*value = (PCI_EXP_TYPE_ROOT_PORT << 4 | 2 |
> > -			  PCI_EXP_FLAGS_SLOT) << 16 | PCI_CAP_ID_EXP;
> > -		break;
> > -
> > -	case PCISWCAP_EXP_DEVCAP:
> > +	switch (reg) {
> > +	case PCI_EXP_DEVCAP:
> >  		*value = mvebu_readl(port, PCIE_CAP_PCIEXP + PCI_EXP_DEVCAP);
> >  		break;
> >  
> > -	case PCISWCAP_EXP_DEVCTL:
> > +	case PCI_EXP_DEVCTL:
> >  		*value = mvebu_readl(port, PCIE_CAP_PCIEXP + PCI_EXP_DEVCTL) &
> >  				 ~(PCI_EXP_DEVCTL_URRE | PCI_EXP_DEVCTL_FERE |
> >  				   PCI_EXP_DEVCTL_NFERE | PCI_EXP_DEVCTL_CERE);
> > -		*value |= bridge->pcie_devctl;
> > +		/* FIXME */
> > +		*value |= bridge->pcie_conf.devctl;
> >  		break;
> >  
> > -	case PCISWCAP_EXP_LNKCAP:
> > +	case PCI_EXP_LNKCAP:
> >  		/*
> >  		 * PCIe requires the clock power management capability to be
> >  		 * hard-wired to zero for downstream ports
> > @@ -600,132 +452,88 @@ static int mvebu_sw_pci_bridge_read(struct mvebu_pcie_port *port,
> >  			 ~PCI_EXP_LNKCAP_CLKPM;
> >  		break;
> >  
> > -	case PCISWCAP_EXP_LNKCTL:
> > +	case PCI_EXP_LNKCTL:
> >  		*value = mvebu_readl(port, PCIE_CAP_PCIEXP + PCI_EXP_LNKCTL);
> >  		break;
> >  
> > -	case PCISWCAP_EXP_SLTCAP:
> > -		*value = bridge->pcie_sltcap;
> > -		break;
> > -
> > -	case PCISWCAP_EXP_SLTCTL:
> > +	case PCI_EXP_SLTCTL:
> >  		*value = PCI_EXP_SLTSTA_PDS << 16;
> >  		break;
> >  
> > -	case PCISWCAP_EXP_RTCTL:
> > -		*value = bridge->pcie_rtctl;
> > -		break;
> > -
> > -	case PCISWCAP_EXP_RTSTA:
> > +	case PCI_EXP_RTSTA:
> >  		*value = mvebu_readl(port, PCIE_RC_RTSTA);
> >  		break;
> >  
> > -	/* PCIe requires the v2 fields to be hard-wired to zero */
> > -	case PCISWCAP_EXP_DEVCAP2:
> > -	case PCISWCAP_EXP_DEVCTL2:
> > -	case PCISWCAP_EXP_LNKCAP2:
> > -	case PCISWCAP_EXP_LNKCTL2:
> > -	case PCISWCAP_EXP_SLTCAP2:
> > -	case PCISWCAP_EXP_SLTCTL2:
> >  	default:
> > -		/*
> > -		 * PCI defines configuration read accesses to reserved or
> > -		 * unimplemented registers to read as zero and complete
> > -		 * normally.
> > -		 */
> > -		*value = 0;
> > -		return PCIBIOS_SUCCESSFUL;
> > +		return PCI_BRIDGE_EMUL_NOT_HANDLED;
> >  	}
> >  
> > -	if (size == 2)
> > -		*value = (*value >> (8 * (where & 3))) & 0xffff;
> > -	else if (size == 1)
> > -		*value = (*value >> (8 * (where & 3))) & 0xff;
> > -
> > -	return PCIBIOS_SUCCESSFUL;
> > +	return PCI_BRIDGE_EMUL_HANDLED;
> >  }
> >  
> > -/* Write to the PCI-to-PCI bridge configuration space */
> > -static int mvebu_sw_pci_bridge_write(struct mvebu_pcie_port *port,
> > -				     unsigned int where, int size, u32 value)
> > +static void
> > +mvebu_pci_bridge_emul_base_conf_write(struct pci_bridge_emul *bridge,
> > +				      int reg, u32 old, u32 new, u32 mask)
> >  {
> > -	struct mvebu_sw_pci_bridge *bridge = &port->bridge;
> > -	u32 mask, reg;
> > -	int err;
> > -
> > -	if (size == 4)
> > -		mask = 0x0;
> > -	else if (size == 2)
> > -		mask = ~(0xffff << ((where & 3) * 8));
> > -	else if (size == 1)
> > -		mask = ~(0xff << ((where & 3) * 8));
> > -	else
> > -		return PCIBIOS_BAD_REGISTER_NUMBER;
> > -
> > -	err = mvebu_sw_pci_bridge_read(port, where & ~3, 4, &reg);
> > -	if (err)
> > -		return err;
> > -
> > -	value = (reg & mask) | value << ((where & 3) * 8);
> > +	struct mvebu_pcie_port *port = bridge->data;
> > +	struct pci_bridge_emul_conf *conf = &bridge->conf;
> >  
> > -	switch (where & ~3) {
> > +	switch (reg) {
> >  	case PCI_COMMAND:
> >  	{
> > -		u32 old = bridge->command;
> > -
> >  		if (!mvebu_has_ioport(port))
> > -			value &= ~PCI_COMMAND_IO;
> > +			conf->command &= ~PCI_COMMAND_IO;
> >  
> > -		bridge->command = value & 0xffff;
> > -		if ((old ^ bridge->command) & PCI_COMMAND_IO)
> > +		if ((old ^ new) & PCI_COMMAND_IO)
> >  			mvebu_pcie_handle_iobase_change(port);
> > -		if ((old ^ bridge->command) & PCI_COMMAND_MEMORY)
> > +		if ((old ^ new) & PCI_COMMAND_MEMORY)
> >  			mvebu_pcie_handle_membase_change(port);
> > -		break;
> > -	}
> >  
> > -	case PCI_BASE_ADDRESS_0 ... PCI_BASE_ADDRESS_1:
> > -		bridge->bar[((where & ~3) - PCI_BASE_ADDRESS_0) / 4] = value;
> >  		break;
> > +	}
> >  
> >  	case PCI_IO_BASE:
> >  		/*
> > -		 * We also keep bit 1 set, it is a read-only bit that
> > +		 * We keep bit 1 set, it is a read-only bit that
> >  		 * indicates we support 32 bits addressing for the
> >  		 * I/O
> >  		 */
> > -		bridge->iobase = (value & 0xff) | PCI_IO_RANGE_TYPE_32;
> > -		bridge->iolimit = ((value >> 8) & 0xff) | PCI_IO_RANGE_TYPE_32;
> > +		conf->iobase |= PCI_IO_RANGE_TYPE_32;
> > +		conf->iolimit |= PCI_IO_RANGE_TYPE_32;
> >  		mvebu_pcie_handle_iobase_change(port);
> >  		break;
> >  
> >  	case PCI_MEMORY_BASE:
> > -		bridge->membase = value & 0xffff;
> > -		bridge->memlimit = value >> 16;
> >  		mvebu_pcie_handle_membase_change(port);
> >  		break;
> >  
> >  	case PCI_IO_BASE_UPPER16:
> > -		bridge->iobaseupper = value & 0xffff;
> > -		bridge->iolimitupper = value >> 16;
> >  		mvebu_pcie_handle_iobase_change(port);
> >  		break;
> >  
> >  	case PCI_PRIMARY_BUS:
> > -		bridge->primary_bus             = value & 0xff;
> > -		bridge->secondary_bus           = (value >> 8) & 0xff;
> > -		bridge->subordinate_bus         = (value >> 16) & 0xff;
> > -		bridge->secondary_latency_timer = (value >> 24) & 0xff;
> > -		mvebu_pcie_set_local_bus_nr(port, bridge->secondary_bus);
> > +		mvebu_pcie_set_local_bus_nr(port, conf->secondary_bus);
> >  		break;
> >  
> > -	case PCISWCAP_EXP_DEVCTL:
> > +	default:
> > +		break;
> > +	}
> > +}
> > +
> > +static void
> > +mvebu_pci_bridge_emul_pcie_conf_write(struct pci_bridge_emul *bridge,
> > +				      int reg, u32 old, u32 new, u32 mask)
> > +{
> > +	struct mvebu_pcie_port *port = bridge->data;
> > +
> > +	switch (reg) {
> > +	case PCI_EXP_DEVCTL:
> >  		/*
> >  		 * Armada370 data says these bits must always
> >  		 * be zero when in root complex mode.
> >  		 */
> > -		value &= ~(PCI_EXP_DEVCTL_URRE | PCI_EXP_DEVCTL_FERE |
> > -			   PCI_EXP_DEVCTL_NFERE | PCI_EXP_DEVCTL_CERE);
> > +		new &= ~(PCI_EXP_DEVCTL_URRE | PCI_EXP_DEVCTL_FERE |
> > +			 PCI_EXP_DEVCTL_NFERE | PCI_EXP_DEVCTL_CERE);
> >  
> >  		/*
> >  		 * If the mask is 0xffff0000, then we only want to write
> > @@ -733,20 +541,20 @@ static int mvebu_sw_pci_bridge_write(struct mvebu_pcie_port *port,
> >  		 * RW1C bits in the device status register.  Mask out the
> >  		 * status register bits.
> >  		 */
> > -		if (mask == 0xffff0000)
> > -			value &= 0xffff;
> > +		if (new == 0xffff0000)
> > +			new &= 0xffff;
> >  
> > -		mvebu_writel(port, value, PCIE_CAP_PCIEXP + PCI_EXP_DEVCTL);
> > +		mvebu_writel(port, new, PCIE_CAP_PCIEXP + PCI_EXP_DEVCTL);
> >  		break;
> >  
> > -	case PCISWCAP_EXP_LNKCTL:
> > +	case PCI_EXP_LNKCTL:
> >  		/*
> >  		 * If we don't support CLKREQ, we must ensure that the
> >  		 * CLKREQ enable bit always reads zero.  Since we haven't
> >  		 * had this capability, and it's dependent on board wiring,
> >  		 * disable it for the time being.
> >  		 */
> > -		value &= ~PCI_EXP_LNKCTL_CLKREQ_EN;
> > +		new &= ~PCI_EXP_LNKCTL_CLKREQ_EN;
> >  
> >  		/*
> >  		 * If the mask is 0xffff0000, then we only want to write
> > @@ -755,21 +563,48 @@ static int mvebu_sw_pci_bridge_write(struct mvebu_pcie_port *port,
> >  		 * RW1C status register bits.
> >  		 */
> >  		if (mask == 0xffff0000)
> > -			value &= ~((PCI_EXP_LNKSTA_LABS |
> > -				    PCI_EXP_LNKSTA_LBMS) << 16);
> > +			new &= ~((PCI_EXP_LNKSTA_LABS |
> > +				  PCI_EXP_LNKSTA_LBMS) << 16);
> >  
> > -		mvebu_writel(port, value, PCIE_CAP_PCIEXP + PCI_EXP_LNKCTL);
> > +		mvebu_writel(port, new, PCIE_CAP_PCIEXP + PCI_EXP_LNKCTL);
> >  		break;
> >  
> > -	case PCISWCAP_EXP_RTSTA:
> > -		mvebu_writel(port, value, PCIE_RC_RTSTA);
> > +	case PCI_EXP_RTSTA:
> > +		mvebu_writel(port, new, PCIE_RC_RTSTA);
> >  		break;
> > +	}
> > +}
> >  
> > -	default:
> > -		break;
> > +struct pci_bridge_emul_ops mvebu_pci_bridge_emul_ops = {
> > +	.write_base = mvebu_pci_bridge_emul_base_conf_write,
> > +	.read_pcie = mvebu_pci_bridge_emul_pcie_conf_read,
> > +	.write_pcie = mvebu_pci_bridge_emul_pcie_conf_write,
> > +};
> > +
> > +/*
> > + * Initialize the configuration space of the PCI-to-PCI bridge
> > + * associated with the given PCIe interface.
> > + */
> > +static void mvebu_pci_bridge_emul_init(struct mvebu_pcie_port *port)
> > +{
> > +	struct pci_bridge_emul *bridge = &port->bridge;
> > +
> > +	bridge->conf.vendor = PCI_VENDOR_ID_MARVELL;
> > +	bridge->conf.device = mvebu_readl(port, PCIE_DEV_ID_OFF) >> 16;
> > +	bridge->conf.class_revision =
> > +		mvebu_readl(port, PCIE_DEV_REV_OFF) & 0xff;
> > +
> > +	if (mvebu_has_ioport(port)) {
> > +		/* We support 32 bits I/O addressing */
> > +		bridge->conf.iobase = PCI_IO_RANGE_TYPE_32;
> > +		bridge->conf.iolimit = PCI_IO_RANGE_TYPE_32;
> >  	}
> >  
> > -	return PCIBIOS_SUCCESSFUL;
> > +	bridge->has_pcie = true;
> > +	bridge->data = port;
> > +	bridge->ops = &mvebu_pci_bridge_emul_ops;
> > +
> > +	pci_bridge_emul_init(bridge);
> >  }
> >  
> >  static inline struct mvebu_pcie *sys_to_pcie(struct pci_sys_data *sys)
> > @@ -789,8 +624,8 @@ static struct mvebu_pcie_port *mvebu_pcie_find_port(struct mvebu_pcie *pcie,
> >  		if (bus->number == 0 && port->devfn == devfn)
> >  			return port;
> >  		if (bus->number != 0 &&
> > -		    bus->number >= port->bridge.secondary_bus &&
> > -		    bus->number <= port->bridge.subordinate_bus)
> > +		    bus->number >= port->bridge.conf.secondary_bus &&
> > +		    bus->number <= port->bridge.conf.subordinate_bus)
> >  			return port;
> >  	}
> >  
> > @@ -811,7 +646,8 @@ static int mvebu_pcie_wr_conf(struct pci_bus *bus, u32 devfn,
> >  
> >  	/* Access the emulated PCI-to-PCI bridge */
> >  	if (bus->number == 0)
> > -		return mvebu_sw_pci_bridge_write(port, where, size, val);
> > +		return pci_bridge_emul_conf_write(&port->bridge, where,
> > +						  size, val);
> >  
> >  	if (!mvebu_pcie_link_up(port))
> >  		return PCIBIOS_DEVICE_NOT_FOUND;
> > @@ -839,7 +675,8 @@ static int mvebu_pcie_rd_conf(struct pci_bus *bus, u32 devfn, int where,
> >  
> >  	/* Access the emulated PCI-to-PCI bridge */
> >  	if (bus->number == 0)
> > -		return mvebu_sw_pci_bridge_read(port, where, size, val);
> > +		return pci_bridge_emul_conf_read(&port->bridge, where,
> > +						 size, val);
> >  
> >  	if (!mvebu_pcie_link_up(port)) {
> >  		*val = 0xffffffff;
> > @@ -1253,7 +1090,7 @@ static int mvebu_pcie_probe(struct platform_device *pdev)
> >  
> >  		mvebu_pcie_setup_hw(port);
> >  		mvebu_pcie_set_local_dev_nr(port, 1);
> > -		mvebu_sw_pci_bridge_init(port);
> > +		mvebu_pci_bridge_emul_init(port);
> >  	}
> >  
> >  	pcie->nports = i;
> > -- 
> > 2.14.4
> > 



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