diff options
| author | Sergio Paracuellos <sergio.paracuellos@gmail.com> | 2021-12-07 11:49:21 +0100 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2022-01-12 15:38:20 -0600 |
| commit | fe7498ef791710a8bb79008850ce7fcbd3903657 (patch) | |
| tree | 55b6bf03aeb47e257c7bddf7fa92b90962d20986 /arch | |
| parent | 661c4c4f2693a8cdd42a93a2418244b8f5115e6b (diff) | |
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
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/mips/ralink/mt7621.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/arch/mips/ralink/mt7621.c b/arch/mips/ralink/mt7621.c index bd71f5b14238..d6efffd4dd20 100644 --- a/arch/mips/ralink/mt7621.c +++ b/arch/mips/ralink/mt7621.c @@ -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"); |