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i2c: designware: Support use in SPL

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Allow this driver to set up an IO address in SPL using an 'early-regs'
property. This allows SPL to use the I2C driver without having to enable
the full PCI stack.

Also split out ofdata_to_platdata in designware driver since this is more
correct, and more convenient for the new logic.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Simon Glass 2019-12-06 21:41:42 -07:00 • committed by Bin Meng
parent 8d72d5bf08
commit fa11fe1b03
1 changed files with 40 additions and 3 deletions
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43
drivers/i2c/designware_i2c_pci.c
View file

@ -7,6 +7,7 @@
#include <common.h>
#include <dm.h>
#include <spl.h>
#include "designware_i2c.h"
/* BayTrail HCNT/LCNT/SDA hold time */
@ -18,17 +19,46 @@ static struct dw_scl_sda_cfg byt_config = {
.sda_hold = 0x6,
};
static int designware_i2c_pci_probe(struct udevice *dev)
static int designware_i2c_pci_ofdata_to_platdata(struct udevice *dev)
{
struct dw_i2c *priv = dev_get_priv(dev);
if (spl_phase() < PHASE_SPL) {
u32 base;
int ret;
ret = dev_read_u32(dev, "early-regs", &base);
if (ret)
return log_msg_ret("early-regs", ret);
/* Set i2c base address */
dm_pci_write_config32(dev, PCI_BASE_ADDRESS_0, base);
/* Enable memory access and bus master */
dm_pci_write_config32(dev, PCI_COMMAND, PCI_COMMAND_MEMORY |
PCI_COMMAND_MASTER);
}
if (spl_phase() < PHASE_BOARD_F) {
/* Handle early, fixed mapping into a different address space */
priv->regs = (struct i2c_regs *)dm_pci_read_bar32(dev, 0);
} else {
priv->regs = (struct i2c_regs *)
dm_pci_map_bar(dev, PCI_BASE_ADDRESS_0, PCI_REGION_MEM);
}
if (!priv->regs)
return -EINVAL;
/* Save base address from PCI BAR */
priv->regs = (struct i2c_regs *)
dm_pci_map_bar(dev, PCI_BASE_ADDRESS_0, PCI_REGION_MEM);
if (IS_ENABLED(CONFIG_INTEL_BAYTRAIL))
/* Use BayTrail specific timing values */
priv->scl_sda_cfg = &byt_config;
return 0;
}
static int designware_i2c_pci_probe(struct udevice *dev)
{
return designware_i2c_probe(dev);
}
@ -56,10 +86,17 @@ static int designware_i2c_pci_bind(struct udevice *dev)
return 0;
}
static const struct udevice_id designware_i2c_pci_ids[] = {
{ .compatible = "snps,designware-i2c-pci" },
{ }
};
U_BOOT_DRIVER(i2c_designware_pci) = {
.name = "i2c_designware_pci",
.id = UCLASS_I2C,
.of_match = designware_i2c_pci_ids,
.bind = designware_i2c_pci_bind,
.ofdata_to_platdata = designware_i2c_pci_ofdata_to_platdata,
.probe = designware_i2c_pci_probe,
.priv_auto_alloc_size = sizeof(struct dw_i2c),
.remove = designware_i2c_remove,