[PATCH v5 6/8] i2c: i801: convert to use common P2SB accessor

Andy Shevchenko
2022-05-10T15:26:47Z

Since we have a common P2SB accessor in tree we may use it instead of
open coded variants.

Replace custom code by p2sb_bar() call.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Tested-by: Henning Schild <henning.schild@siemens.com>
Acked-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Jean Delvare <jdelvare@suse.de>
Acked-by: Wolfram Sang <wsa@kernel.org>
---
drivers/i2c/busses/Kconfig | 1 +
drivers/i2c/busses/i2c-i801.c | 39 +++++++------------------------
drivers/platform/x86/intel/p2sb.c | 6 +++++
3 files changed, 16 insertions(+), 30 deletions(-)

diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
index a1bae59208e3..4d0a195ca3ef 100644
--- a/drivers/i2c/busses/Kconfig
+++ b/drivers/i2c/busses/Kconfig
@@ -108,6 +108,7 @@ config I2C_HIX5HD2
config I2C_I801
tristate "Intel 82801 (ICH/PCH)"
depends on PCI
+ select P2SB if X86
select CHECK_SIGNATURE if X86 && DMI
select I2C_SMBUS
help
diff --git a/drivers/i2c/busses/i2c-i801.c b/drivers/i2c/busses/i2c-i801.c
index ff706349bdfb..f7a0bb372e8e 100644
--- a/drivers/i2c/busses/i2c-i801.c
+++ b/drivers/i2c/busses/i2c-i801.c
@@ -111,6 +111,7 @@
#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/platform_data/itco_wdt.h>
+#include <linux/platform_data/x86/p2sb.h>
#include <linux/pm_runtime.h>
#include <linux/mutex.h>

@@ -140,7 +141,6 @@
#define TCOBASE 0x050
#define TCOCTL 0x054

-#define SBREG_BAR 0x10
#define SBREG_SMBCTRL 0xc6000c
#define SBREG_SMBCTRL_DNV 0xcf000c

@@ -1482,45 +1482,24 @@ i801_add_tco_spt(struct i801_priv *priv, struct pci_dev *pci_dev,
.version = 4,
};
struct resource *res;
- unsigned int devfn;
- u64 base64_addr;
- u32 base_addr;
- u8 hidden;
+ int ret;

/*
* We must access the NO_REBOOT bit over the Primary to Sideband
- * bridge (P2SB). The BIOS prevents the P2SB device from being
- * enumerated by the PCI subsystem, so we need to unhide/hide it
- * to lookup the P2SB BAR.
+ * (P2SB) bridge.
*/
- pci_lock_rescan_remove();
-
- devfn = PCI_DEVFN(PCI_SLOT(pci_dev->devfn), 1);
-
- /* Unhide the P2SB device, if it is hidden */
- pci_bus_read_config_byte(pci_dev->bus, devfn, 0xe1, &hidden);
- if (hidden)
- pci_bus_write_config_byte(pci_dev->bus, devfn, 0xe1, 0x0);
-
- pci_bus_read_config_dword(pci_dev->bus, devfn, SBREG_BAR, &base_addr);
- base64_addr = base_addr & 0xfffffff0;
-
- pci_bus_read_config_dword(pci_dev->bus, devfn, SBREG_BAR + 0x4, &base_addr);
- base64_addr |= (u64)base_addr << 32;
-
- /* Hide the P2SB device, if it was hidden before */
- if (hidden)
- pci_bus_write_config_byte(pci_dev->bus, devfn, 0xe1, hidden);
- pci_unlock_rescan_remove();

res = &tco_res[1];
+ ret = p2sb_bar(pci_dev->bus, 0, res);
+ if (ret)
+ return ERR_PTR(ret);
+
if (pci_dev->device == PCI_DEVICE_ID_INTEL_DNV_SMBUS)
- res->start = (resource_size_t)base64_addr + SBREG_SMBCTRL_DNV;
+ res->start += SBREG_SMBCTRL_DNV;
else
- res->start = (resource_size_t)base64_addr + SBREG_SMBCTRL;
+ res->start += SBREG_SMBCTRL;

res->end = res->start + 3;
- res->flags = IORESOURCE_MEM;

return platform_device_register_resndata(&pci_dev->dev, "iTCO_wdt", -1,
tco_res, 2, &pldata, sizeof(pldata));
diff --git a/drivers/platform/x86/intel/p2sb.c b/drivers/platform/x86/intel/p2sb.c
index b598ef14dbc6..fb2e141f3eb8 100644
--- a/drivers/platform/x86/intel/p2sb.c
+++ b/drivers/platform/x86/intel/p2sb.c
@@ -21,6 +21,12 @@

static const struct x86_cpu_id p2sb_cpu_ids[] = {
X86_MATCH_INTEL_FAM6_MODEL(ATOM_GOLDMONT, PCI_DEVFN(13, 0)),
+ X86_MATCH_INTEL_FAM6_MODEL(ATOM_GOLDMONT_D, PCI_DEVFN(31, 1)),
+ X86_MATCH_INTEL_FAM6_MODEL(ATOM_SILVERMONT_D, PCI_DEVFN(31, 1)),
+ X86_MATCH_INTEL_FAM6_MODEL(KABYLAKE, PCI_DEVFN(31, 1)),
+ X86_MATCH_INTEL_FAM6_MODEL(KABYLAKE_L, PCI_DEVFN(31, 1)),
+ X86_MATCH_INTEL_FAM6_MODEL(SKYLAKE, PCI_DEVFN(31, 1)),
+ X86_MATCH_INTEL_FAM6_MODEL(SKYLAKE_L, PCI_DEVFN(31, 1)),
{}
};

--
2.35.1