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authorSimon Glass2019-12-10 21:28:20 -0700
committerBin Meng2019-12-15 11:44:27 +0800
commit070a94600855d895e3aef97a0acfbf4d8fca26e8 (patch)
tree175ba65311628e0f0c9b0965f5211162f4e39514 /drivers/i2c
parent0a6f333e8d1d05c0d8a0e67439d4ebbab885834d (diff)
i2c: designware: Add Apollo Lake support
For Apollo Lake we need to take the I2C bus controller out of reset before using this. Add this functionality to the driver. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Heiko Schocher <hs@denx.de> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Diffstat (limited to 'drivers/i2c')
-rw-r--r--drivers/i2c/designware_i2c_pci.c25
1 files changed, 25 insertions, 0 deletions
diff --git a/drivers/i2c/designware_i2c_pci.c b/drivers/i2c/designware_i2c_pci.c
index bb1f809af3c..7f0625df66b 100644
--- a/drivers/i2c/designware_i2c_pci.c
+++ b/drivers/i2c/designware_i2c_pci.c
@@ -8,8 +8,14 @@
#include <common.h>
#include <dm.h>
#include <spl.h>
+#include <asm/lpss.h>
#include "designware_i2c.h"
+enum {
+ VANILLA = 0, /* standard I2C with no tweaks */
+ INTEL_APL, /* Apollo Lake I2C */
+};
+
/* BayTrail HCNT/LCNT/SDA hold time */
static struct dw_scl_sda_cfg byt_config = {
.ss_hcnt = 0x200,
@@ -19,6 +25,9 @@ static struct dw_scl_sda_cfg byt_config = {
.sda_hold = 0x6,
};
+/* Have a weak function for now - possibly should be a new uclass */
+__weak void lpss_reset_release(void *regs);
+
static int designware_i2c_pci_ofdata_to_platdata(struct udevice *dev)
{
struct dw_i2c *priv = dev_get_priv(dev);
@@ -59,6 +68,15 @@ static int designware_i2c_pci_ofdata_to_platdata(struct udevice *dev)
static int designware_i2c_pci_probe(struct udevice *dev)
{
+ struct dw_i2c *priv = dev_get_priv(dev);
+
+ if (dev_get_driver_data(dev) == INTEL_APL) {
+ /* Ensure controller is in D0 state */
+ lpss_set_power_state(dev, STATE_D0);
+
+ lpss_reset_release(priv->regs);
+ }
+
return designware_i2c_probe(dev);
}
@@ -88,6 +106,7 @@ static int designware_i2c_pci_bind(struct udevice *dev)
static const struct udevice_id designware_i2c_pci_ids[] = {
{ .compatible = "snps,designware-i2c-pci" },
+ { .compatible = "intel,apl-i2c", .data = INTEL_APL },
{ }
};
@@ -113,6 +132,12 @@ static struct pci_device_id designware_pci_supported[] = {
{ PCI_VDEVICE(INTEL, 0x0f45) },
{ PCI_VDEVICE(INTEL, 0x0f46) },
{ PCI_VDEVICE(INTEL, 0x0f47) },
+ { PCI_VDEVICE(INTEL, 0x5aac), .driver_data = INTEL_APL },
+ { PCI_VDEVICE(INTEL, 0x5aae), .driver_data = INTEL_APL },
+ { PCI_VDEVICE(INTEL, 0x5ab0), .driver_data = INTEL_APL },
+ { PCI_VDEVICE(INTEL, 0x5ab2), .driver_data = INTEL_APL },
+ { PCI_VDEVICE(INTEL, 0x5ab4), .driver_data = INTEL_APL },
+ { PCI_VDEVICE(INTEL, 0x5ab6), .driver_data = INTEL_APL },
{},
};