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Message-ID: <20220130184130.176646-7-terry.bowman@amd.com>
Date: Sun, 30 Jan 2022 12:41:27 -0600
From: Terry Bowman <terry.bowman@....com>
To: <terry.bowman@....com>, <linux@...ck-us.net>,
<linux-watchdog@...r.kernel.org>, <jdelvare@...e.com>,
<linux-i2c@...r.kernel.org>, <wsa@...nel.org>,
<andy.shevchenko@...il.com>, <rafael.j.wysocki@...el.com>
CC: <linux-kernel@...r.kernel.org>, <wim@...ux-watchdog.org>,
<rrichter@....com>, <thomas.lendacky@....com>,
<sudheesh.mavila@....com>, <Nehal-bakulchandra.Shah@....com>,
<Basavaraj.Natikar@....com>, <Shyam-sundar.S-k@....com>,
<Mario.Limonciello@....com>
Subject: [PATCH v4 6/9] i2c: piix4: Add EFCH MMIO support to region request and release
EFCH cd6h/cd7h port I/O may no longer be available on later AMD
processors and it is recommended to use MMIO instead. Update the
request and release functions to support MMIO.
MMIO request/release and mmapping require details during cleanup.
Add a MMIO configuration structure containing resource and vaddress
details for mapping the region, accessing the region, and releasing
the region.
Signed-off-by: Terry Bowman <terry.bowman@....com>
---
drivers/i2c/busses/i2c-piix4.c | 61 ++++++++++++++++++++++++++++++----
1 file changed, 55 insertions(+), 6 deletions(-)
diff --git a/drivers/i2c/busses/i2c-piix4.c b/drivers/i2c/busses/i2c-piix4.c
index 32a30af5778a..7defa0c5f1f9 100644
--- a/drivers/i2c/busses/i2c-piix4.c
+++ b/drivers/i2c/busses/i2c-piix4.c
@@ -98,6 +98,9 @@
#define SB800_PIIX4_PORT_IDX_MASK_KERNCZ 0x18
#define SB800_PIIX4_PORT_IDX_SHIFT_KERNCZ 3
+#define SB800_PIIX4_FCH_PM_ADDR 0xFED80300
+#define SB800_PIIX4_FCH_PM_SIZE 8
+
/* insmod parameters */
/* If force is set to anything different from 0, we forcibly enable the
@@ -156,6 +159,12 @@ static const char *piix4_main_port_names_sb800[PIIX4_MAX_ADAPTERS] = {
};
static const char *piix4_aux_port_name_sb800 = " port 1";
+struct sb800_mmio_cfg {
+ void __iomem *addr;
+ struct resource *res;
+ bool use_mmio;
+};
+
struct i2c_piix4_adapdata {
unsigned short smba;
@@ -163,10 +172,40 @@ struct i2c_piix4_adapdata {
bool sb800_main;
bool notify_imc;
u8 port; /* Port number, shifted */
+ struct sb800_mmio_cfg mmio_cfg;
};
-static int piix4_sb800_region_request(struct device *dev)
+static int piix4_sb800_region_request(struct device *dev,
+ struct sb800_mmio_cfg *mmio_cfg)
{
+ if (mmio_cfg->use_mmio) {
+ struct resource *res;
+ void __iomem *addr;
+
+ res = request_mem_region_muxed(SB800_PIIX4_FCH_PM_ADDR,
+ SB800_PIIX4_FCH_PM_SIZE,
+ "sb800_piix4_smb");
+ if (!res) {
+ dev_err(dev,
+ "SMBus base address memory region 0x%x already in use.\n",
+ SB800_PIIX4_FCH_PM_ADDR);
+ return -EBUSY;
+ }
+
+ addr = ioremap(SB800_PIIX4_FCH_PM_ADDR,
+ SB800_PIIX4_FCH_PM_SIZE);
+ if (!addr) {
+ release_resource(res);
+ dev_err(dev, "SMBus base address mapping failed.\n");
+ return -ENOMEM;
+ }
+
+ mmio_cfg->res = res;
+ mmio_cfg->addr = addr;
+
+ return 0;
+ }
+
if (!request_muxed_region(SB800_PIIX4_SMB_IDX, SB800_PIIX4_SMB_MAP_SIZE,
"sb800_piix4_smb")) {
dev_err(dev,
@@ -178,8 +217,15 @@ static int piix4_sb800_region_request(struct device *dev)
return 0;
}
-static void piix4_sb800_region_release(struct device *dev)
+static void piix4_sb800_region_release(struct device *dev,
+ struct sb800_mmio_cfg *mmio_cfg)
{
+ if (mmio_cfg->use_mmio) {
+ iounmap(mmio_cfg->addr);
+ release_resource(mmio_cfg->res);
+ return;
+ }
+
release_region(SB800_PIIX4_SMB_IDX, SB800_PIIX4_SMB_MAP_SIZE);
}
@@ -288,11 +334,13 @@ static int piix4_setup_sb800_smba(struct pci_dev *PIIX4_dev,
u8 *smb_en_status,
unsigned short *piix4_smba)
{
+ struct sb800_mmio_cfg mmio_cfg;
u8 smba_en_lo;
u8 smba_en_hi;
int retval;
- retval = piix4_sb800_region_request(&PIIX4_dev->dev);
+ mmio_cfg.use_mmio = 0;
+ retval = piix4_sb800_region_request(&PIIX4_dev->dev, &mmio_cfg);
if (retval)
return retval;
@@ -301,7 +349,7 @@ static int piix4_setup_sb800_smba(struct pci_dev *PIIX4_dev,
outb_p(smb_en + 1, SB800_PIIX4_SMB_IDX);
smba_en_hi = inb_p(SB800_PIIX4_SMB_IDX + 1);
- piix4_sb800_region_release(&PIIX4_dev->dev);
+ piix4_sb800_region_release(&PIIX4_dev->dev, &mmio_cfg);
if (!smb_en) {
*smb_en_status = smba_en_lo & 0x10;
@@ -731,7 +779,7 @@ static s32 piix4_access_sb800(struct i2c_adapter *adap, u16 addr,
u8 prev_port;
int retval;
- retval = piix4_sb800_region_request(&adap->dev);
+ retval = piix4_sb800_region_request(&adap->dev, &adapdata->mmio_cfg);
if (retval)
return retval;
@@ -802,7 +850,7 @@ static s32 piix4_access_sb800(struct i2c_adapter *adap, u16 addr,
piix4_imc_wakeup();
release:
- piix4_sb800_region_release(&adap->dev);
+ piix4_sb800_region_release(&adap->dev, &adapdata->mmio_cfg);
return retval;
}
@@ -880,6 +928,7 @@ static int piix4_add_adapter(struct pci_dev *dev, unsigned short smba,
return -ENOMEM;
}
+ adapdata->mmio_cfg.use_mmio = 0;
adapdata->smba = smba;
adapdata->sb800_main = sb800_main;
adapdata->port = port << piix4_port_shift_sb800;
--
2.30.2
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