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i2c: designware: Add Apollo Lake support

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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>
This commit is contained in:
Simon Glass 2019-12-10 21:28:20 -07:00 committed by Bin Meng
parent 0a6f333e8d
commit 070a946008
1 changed files with 25 additions and 0 deletions
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25
drivers/i2c/designware_i2c_pci.c
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@ -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 },
{},
};