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Code Issues Releases Wiki Activity

PCI: designware: Remove open-coded bitmap operations

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Replace them by using the standard kernel bitmap ops.  No functional
change, but makes the code a lot cleaner.

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Pratyush Anand <pratyush.anand@st.com>
Acked-by: Jingoo Han <jg1.han@samsung.com>
This commit is contained in:
Lucas Stach 2014-09-30 18:36:27 +02:00 committed by Bjorn Helgaas
parent 91f8ae823f
commit c8df6ac945
1 changed files with 7 additions and 44 deletions
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51
drivers/pci/host/pcie-designware.c
View file

@ -196,30 +196,6 @@ void dw_pcie_msi_init(struct pcie_port *pp)
dw_pcie_wr_own_conf(pp, PCIE_MSI_ADDR_HI, 4, 0);
}
static int find_valid_pos0(struct pcie_port *pp, int msgvec, int pos, int *pos0)
{
int flag = 1;
do {
pos = find_next_zero_bit(pp->msi_irq_in_use,
MAX_MSI_IRQS, pos);
/*if you have reached to the end then get out from here.*/
if (pos == MAX_MSI_IRQS)
return -ENOSPC;
/*
* Check if this position is at correct offset.nvec is always a
* power of two. pos0 must be nvec bit aligned.
*/
if (pos % msgvec)
pos += msgvec - (pos % msgvec);
else
flag = 0;
} while (flag);
*pos0 = pos;
return 0;
}
static void dw_pcie_msi_clear_irq(struct pcie_port *pp, int irq)
{
unsigned int res, bit, val;
@ -238,13 +214,14 @@ static void clear_irq_range(struct pcie_port *pp, unsigned int irq_base,
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 */
if (pp->ops->msi_clear_irq)
pp->ops->msi_clear_irq(pp, pos + i);
else
dw_pcie_msi_clear_irq(pp, pos + i);
}
bitmap_release_region(pp->msi_irq_in_use, pos, order_base_2(nvec));
}
static void dw_pcie_msi_set_irq(struct pcie_port *pp, int irq)
@ -260,26 +237,13 @@ static void dw_pcie_msi_set_irq(struct pcie_port *pp, int irq)
static int assign_irq(int no_irqs, struct msi_desc *desc, int *pos)
{
int irq, pos0, pos1, i;
int irq, pos0, i;
struct pcie_port *pp = sys_to_pcie(desc->dev->bus->sysdata);
pos0 = find_first_zero_bit(pp->msi_irq_in_use,
MAX_MSI_IRQS);
if (pos0 % no_irqs) {
if (find_valid_pos0(pp, no_irqs, pos0, &pos0))
goto no_valid_irq;
}
if (no_irqs > 1) {
pos1 = find_next_bit(pp->msi_irq_in_use,
MAX_MSI_IRQS, pos0);
/* there must be nvec number of consecutive free bits */
while ((pos1 - pos0) < no_irqs) {
if (find_valid_pos0(pp, no_irqs, pos1, &pos0))
goto no_valid_irq;
pos1 = find_next_bit(pp->msi_irq_in_use,
MAX_MSI_IRQS, pos0);
}
}
pos0 = bitmap_find_free_region(pp->msi_irq_in_use, MAX_MSI_IRQS,
order_base_2(no_irqs));
if (pos0 < 0)
goto no_valid_irq;
irq = irq_find_mapping(pp->irq_domain, pos0);
if (!irq)
@ -297,7 +261,6 @@ static int assign_irq(int no_irqs, struct msi_desc *desc, int *pos)
clear_irq_range(pp, irq, i, pos0);
goto no_valid_irq;
}
set_bit(pos0 + i, pp->msi_irq_in_use);
/*Enable corresponding interrupt in MSI interrupt controller */
if (pp->ops->msi_set_irq)
pp->ops->msi_set_irq(pp, pos0 + i);