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PCI: cadence-host: Introduce cdns_pcie_host_disable() helper for cleanup

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Introduce the helper function cdns_pcie_host_disable() which will undo
the configuration performed by cdns_pcie_host_setup(). Also, export it
for use by existing callers of cdns_pcie_host_setup(), thereby allowing
them to cleanup on their exit path.

Signed-off-by: Siddharth Vadapalli <s-vadapalli@ti.com>
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Link: https://patch.msgid.link/20250417124408.2752248-3-s-vadapalli@ti.com
This commit is contained in:
Siddharth Vadapalli 2025-04-17 18:14:06 +05:30 committed by Bjorn Helgaas
parent f876904e44
commit 47f25da6c5
2 changed files with 109 additions and 0 deletions
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104
drivers/pci/controller/cadence/pcie-cadence-host.c
View File

@ -152,6 +152,14 @@ static int cdns_pcie_retrain(struct cdns_pcie *pcie)
return ret;
}
static void cdns_pcie_host_disable_ptm_response(struct cdns_pcie *pcie)
{
u32 val;
val = cdns_pcie_readl(pcie, CDNS_PCIE_LM_PTM_CTRL);
cdns_pcie_writel(pcie, CDNS_PCIE_LM_PTM_CTRL, val & ~CDNS_PCIE_LM_TPM_CTRL_PTMRSEN);
}
static void cdns_pcie_host_enable_ptm_response(struct cdns_pcie *pcie)
{
u32 val;
@ -177,6 +185,26 @@ static int cdns_pcie_host_start_link(struct cdns_pcie_rc *rc)
return ret;
}
static void cdns_pcie_host_deinit_root_port(struct cdns_pcie_rc *rc)
{
struct cdns_pcie *pcie = &rc->pcie;
u32 value, ctrl;
cdns_pcie_rp_writew(pcie, PCI_CLASS_DEVICE, 0xffff);
cdns_pcie_rp_writeb(pcie, PCI_CLASS_PROG, 0xff);
cdns_pcie_rp_writeb(pcie, PCI_CLASS_REVISION, 0xff);
cdns_pcie_writel(pcie, CDNS_PCIE_LM_ID, 0xffffffff);
cdns_pcie_rp_writew(pcie, PCI_DEVICE_ID, 0xffff);
ctrl = CDNS_PCIE_LM_BAR_CFG_CTRL_DISABLED;
value = ~(CDNS_PCIE_LM_RC_BAR_CFG_BAR0_CTRL(ctrl) |
CDNS_PCIE_LM_RC_BAR_CFG_BAR1_CTRL(ctrl) |
CDNS_PCIE_LM_RC_BAR_CFG_PREFETCH_MEM_ENABLE |
CDNS_PCIE_LM_RC_BAR_CFG_PREFETCH_MEM_64BITS |
CDNS_PCIE_LM_RC_BAR_CFG_IO_ENABLE |
CDNS_PCIE_LM_RC_BAR_CFG_IO_32BITS);
cdns_pcie_writel(pcie, CDNS_PCIE_LM_RC_BAR_CFG, value);
}
static int cdns_pcie_host_init_root_port(struct cdns_pcie_rc *rc)
{
struct cdns_pcie *pcie = &rc->pcie;
@ -393,6 +421,32 @@ static int cdns_pcie_host_dma_ranges_cmp(void *priv, const struct list_head *a,
return resource_size(entry2->res) - resource_size(entry1->res);
}
static void cdns_pcie_host_unmap_dma_ranges(struct cdns_pcie_rc *rc)
{
struct cdns_pcie *pcie = &rc->pcie;
enum cdns_pcie_rp_bar bar;
u32 value;
/* Reset inbound configuration for all BARs which were being used */
for (bar = RP_BAR0; bar <= RP_NO_BAR; bar++) {
if (rc->avail_ib_bar[bar])
continue;
cdns_pcie_writel(pcie, CDNS_PCIE_AT_IB_RP_BAR_ADDR0(bar), 0);
cdns_pcie_writel(pcie, CDNS_PCIE_AT_IB_RP_BAR_ADDR1(bar), 0);
if (bar == RP_NO_BAR)
continue;
value = ~(LM_RC_BAR_CFG_CTRL_MEM_64BITS(bar) |
LM_RC_BAR_CFG_CTRL_PREF_MEM_64BITS(bar) |
LM_RC_BAR_CFG_CTRL_MEM_32BITS(bar) |
LM_RC_BAR_CFG_CTRL_PREF_MEM_32BITS(bar) |
LM_RC_BAR_CFG_APERTURE(bar, bar_aperture_mask[bar] + 2));
cdns_pcie_writel(pcie, CDNS_PCIE_LM_RC_BAR_CFG, value);
}
}
static int cdns_pcie_host_map_dma_ranges(struct cdns_pcie_rc *rc)
{
struct cdns_pcie *pcie = &rc->pcie;
@ -430,6 +484,29 @@ static int cdns_pcie_host_map_dma_ranges(struct cdns_pcie_rc *rc)
return 0;
}
static void cdns_pcie_host_deinit_address_translation(struct cdns_pcie_rc *rc)
{
struct cdns_pcie *pcie = &rc->pcie;
struct pci_host_bridge *bridge = pci_host_bridge_from_priv(rc);
struct resource_entry *entry;
int r;
cdns_pcie_host_unmap_dma_ranges(rc);
/*
* Reset outbound region 0 which was reserved for configuration space
* accesses.
*/
cdns_pcie_reset_outbound_region(pcie, 0);
/* Reset rest of the outbound regions */
r = 1;
resource_list_for_each_entry(entry, &bridge->windows) {
cdns_pcie_reset_outbound_region(pcie, r);
r++;
}
}
static int cdns_pcie_host_init_address_translation(struct cdns_pcie_rc *rc)
{
struct cdns_pcie *pcie = &rc->pcie;
@ -487,6 +564,12 @@ static int cdns_pcie_host_init_address_translation(struct cdns_pcie_rc *rc)
return cdns_pcie_host_map_dma_ranges(rc);
}
static void cdns_pcie_host_deinit(struct cdns_pcie_rc *rc)
{
cdns_pcie_host_deinit_address_translation(rc);
cdns_pcie_host_deinit_root_port(rc);
}
int cdns_pcie_host_init(struct cdns_pcie_rc *rc)
{
int err;
@ -499,6 +582,14 @@ int cdns_pcie_host_init(struct cdns_pcie_rc *rc)
}
EXPORT_SYMBOL_GPL(cdns_pcie_host_init);
static void cdns_pcie_host_link_disable(struct cdns_pcie_rc *rc)
{
struct cdns_pcie *pcie = &rc->pcie;
cdns_pcie_stop_link(pcie);
cdns_pcie_host_disable_ptm_response(pcie);
}
int cdns_pcie_host_link_setup(struct cdns_pcie_rc *rc)
{
struct cdns_pcie *pcie = &rc->pcie;
@ -524,6 +615,19 @@ int cdns_pcie_host_link_setup(struct cdns_pcie_rc *rc)
}
EXPORT_SYMBOL_GPL(cdns_pcie_host_link_setup);
void cdns_pcie_host_disable(struct cdns_pcie_rc *rc)
{
struct pci_host_bridge *bridge;
bridge = pci_host_bridge_from_priv(rc);
pci_stop_root_bus(bridge->bus);
pci_remove_root_bus(bridge->bus);
cdns_pcie_host_deinit(rc);
cdns_pcie_host_link_disable(rc);
}
EXPORT_SYMBOL_GPL(cdns_pcie_host_disable);
int cdns_pcie_host_setup(struct cdns_pcie_rc *rc)
{
struct device *dev = rc->pcie.dev;

5
drivers/pci/controller/cadence/pcie-cadence.h
View File

@ -512,6 +512,7 @@ static inline bool cdns_pcie_link_up(struct cdns_pcie *pcie)
int cdns_pcie_host_link_setup(struct cdns_pcie_rc *rc);
int cdns_pcie_host_init(struct cdns_pcie_rc *rc);
int cdns_pcie_host_setup(struct cdns_pcie_rc *rc);
void cdns_pcie_host_disable(struct cdns_pcie_rc *rc);
void __iomem *cdns_pci_map_bus(struct pci_bus *bus, unsigned int devfn,
int where);
#else
@ -530,6 +531,10 @@ static inline int cdns_pcie_host_setup(struct cdns_pcie_rc *rc)
return 0;
}
static inline void cdns_pcie_host_disable(struct cdns_pcie_rc *rc)
{
}
static inline void __iomem *cdns_pci_map_bus(struct pci_bus *bus, unsigned int devfn,
int where)
{