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PCI: designware: Add MSI-related pcie_host_ops for v3.65 hardware

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DesignWare v3.65 hardware implements MSI controller registers in
application space.  This requires updates to the DesignWare core to
support controllers based on this older hardware.

Add msi_irq_set()/clear() interfaces to allow Set/Clear MSI IRQ enable bit
in the application register.  Also, v3.65 hardware uses the MSI_IRQ
register in application register space to raise MSI IRQ to the RC from EP.
Current code uses the standard mechanism as per PCI spec.  So add
get_msi_data() to get the address of this register so common code can
work on both v3.65 and newer hardware.

[bhelgaas: changelog]
Signed-off-by: Murali Karicheri <m-karicheri2@ti.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Pratyush Anand <pratyush.anand@st.com>
Acked-by: Mohit Kumar <mohit.kumar@st.com>
Acked-by: Jingoo Han <jg1.han@samsung.com>
Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
CC: Russell King <linux@arm.linux.org.uk>
CC: Grant Likely <grant.likely@linaro.org>
CC: Rob Herring <robh+dt@kernel.org>
CC: Richard Zhu <r65037@freescale.com>
CC: Kishon Vijay Abraham I <kishon@ti.com>
CC: Marek Vasut <marex@denx.de>
CC: Arnd Bergmann <arnd@arndb.de>
CC: Pawel Moll <pawel.moll@arm.com>
CC: Mark Rutland <mark.rutland@arm.com>
CC: Ian Campbell <ijc+devicetree@hellion.org.uk>
CC: Kumar Gala <galak@codeaurora.org>
CC: Randy Dunlap <rdunlap@infradead.org>
CC: Grant Likely <grant.likely@linaro.org>
This commit is contained in:
Murali Karicheri 2014-07-21 12:58:42 -04:00 committed by Bjorn Helgaas
parent a1c0ae9c24
commit 2f37c5a81c
2 changed files with 39 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

50
drivers/pci/host/pcie-designware.c
View File

@ -218,27 +218,47 @@ static int find_valid_pos0(struct pcie_port *pp, int msgvec, int pos, int *pos0)
return 0;
}
static void dw_pcie_msi_clear_irq(struct pcie_port *pp, int irq)
{
unsigned int res, bit, val;
res = (irq / 32) * 12;
bit = irq % 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);
}
static void clear_irq_range(struct pcie_port *pp, unsigned int irq_base,
unsigned int nvec, unsigned int pos)
{
unsigned int i, res, bit, val;
unsigned int i;
for (i = 0; i < nvec; i++) {
irq_set_msi_desc_off(irq_base, i, NULL);
clear_bit(pos + i, pp->msi_irq_in_use);
/* Disable corresponding interrupt on MSI controller */
res = ((pos + i) / 32) * 12;
bit = (pos + 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->ops->msi_clear_irq)
pp->ops->msi_clear_irq(pp, pos + i);
else
dw_pcie_msi_clear_irq(pp, pos + i);
}
}
static void dw_pcie_msi_set_irq(struct pcie_port *pp, int irq)
{
unsigned int res, bit, val;
res = (irq / 32) * 12;
bit = irq % 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);
}
static int assign_irq(int no_irqs, struct msi_desc *desc, int *pos)
{
int res, bit, irq, pos0, pos1, i;
u32 val;
int irq, pos0, pos1, i;
struct pcie_port *pp = sys_to_pcie(desc->dev->bus->sysdata);
if (!pp) {
@ -282,11 +302,10 @@ 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->ops->msi_set_irq)
pp->ops->msi_set_irq(pp, pos0 + i);
else
dw_pcie_msi_set_irq(pp, pos0 + i);
}
*pos = pos0;
@ -354,7 +373,10 @@ 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);

3
drivers/pci/host/pcie-designware.h
View File

@ -71,6 +71,9 @@ struct pcie_host_ops {
unsigned int devfn, int where, int size, u32 val);
int (*link_up)(struct pcie_port *pp);
void (*host_init)(struct pcie_port *pp);
void (*msi_set_irq)(struct pcie_port *pp, int irq);
void (*msi_clear_irq)(struct pcie_port *pp, int irq);
u32 (*get_msi_data)(struct pcie_port *pp);
};
int dw_pcie_cfg_read(void __iomem *addr, int where, int size, u32 *val);