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PCI: mt7621: Move MIPS setup to pcibios_root_bridge_prepare() 

On the MIPS ralink mt7621 platform, we need to set up I/O coherency units
based on the host bridge apertures.

To remove this arch dependency from the driver itself, move the coherency
setup from the driver to pcibios_root_bridge_prepare().

[bhelgaas: squash add/remove into one patch, commit log]
Link: https://lore.kernel.org/r/20211207104924.21327-3-sergio.paracuellos@gmail.com
Link: https://lore.kernel.org/r/20211207104924.21327-4-sergio.paracuellos@gmail.com
Signed-off-by: Sergio Paracuellos <sergio.paracuellos@gmail.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>             # arch/mips
Acked-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>   # arch/mips
This commit is contained in:
Sergio Paracuellos 2021-12-07 11:49:21 +01:00 committed by Bjorn Helgaas
parent 661c4c4f26
commit fe7498ef79
2 changed files with 31 additions and 37 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

31
arch/mips/ralink/mt7621.c
View File

@ -10,6 +10,8 @@
#include <linux/slab.h>
#include <linux/sys_soc.h>
#include <linux/memblock.h>
#include <linux/pci.h>
#include <linux/bug.h>
#include <asm/bootinfo.h>
#include <asm/mipsregs.h>
@ -22,6 +24,35 @@
static void *detect_magic __initdata = detect_memory_region;
int pcibios_root_bridge_prepare(struct pci_host_bridge *bridge)
{
struct resource_entry *entry;
resource_size_t mask;
entry = resource_list_first_type(&bridge->windows, IORESOURCE_MEM);
if (!entry) {
pr_err("Cannot get memory resource\n");
return -EINVAL;
}
if (mips_cps_numiocu(0)) {
/*
* Hardware doesn't accept mask values with 1s after
* 0s (e.g. 0xffef), so warn if that's happen
*/
mask = ~(entry->res->end - entry->res->start) & CM_GCR_REGn_MASK_ADDRMASK;
WARN_ON(mask && BIT(ffz(~mask)) - 1 != ~mask);
write_gcr_reg1_base(entry->res->start);
write_gcr_reg1_mask(mask | CM_GCR_REGn_MASK_CMTGT_IOCU0);
pr_info("PCI coherence region base: 0x%08llx, mask/settings: 0x%08llx\n",
(unsigned long long)read_gcr_reg1_base(),
(unsigned long long)read_gcr_reg1_mask());
}
return 0;
}
phys_addr_t mips_cpc_default_phys_base(void)
{
panic("Cannot detect cpc address");

37
drivers/pci/controller/pcie-mt7621.c
View File

@ -208,37 +208,6 @@ static inline void mt7621_control_deassert(struct mt7621_pcie_port *port)
reset_control_assert(port->pcie_rst);
}
static int setup_cm_memory_region(struct pci_host_bridge *host)
{
struct mt7621_pcie *pcie = pci_host_bridge_priv(host);
struct device *dev = pcie->dev;
struct resource_entry *entry;
resource_size_t mask;
entry = resource_list_first_type(&host->windows, IORESOURCE_MEM);
if (!entry) {
dev_err(dev, "cannot get memory resource\n");
return -EINVAL;
}
if (mips_cps_numiocu(0)) {
/*
* FIXME: hardware doesn't accept mask values with 1s after
* 0s (e.g. 0xffef), so it would be great to warn if that's
* about to happen
*/
mask = ~(entry->res->end - entry->res->start);
write_gcr_reg1_base(entry->res->start);
write_gcr_reg1_mask(mask | CM_GCR_REGn_MASK_CMTGT_IOCU0);
dev_info(dev, "PCI coherence region base: 0x%08llx, mask/settings: 0x%08llx\n",
(unsigned long long)read_gcr_reg1_base(),
(unsigned long long)read_gcr_reg1_mask());
}
return 0;
}
static int mt7621_pcie_parse_port(struct mt7621_pcie *pcie,
struct device_node *node,
int slot)
@ -557,12 +526,6 @@ static int mt7621_pci_probe(struct platform_device *pdev)
goto remove_resets;
}
err = setup_cm_memory_region(bridge);
if (err) {
dev_err(dev, "error setting up iocu mem regions\n");
goto remove_resets;
}
return mt7621_pcie_register_host(bridge);
remove_resets: