diff options
| author | Simon Glass <sjg@chromium.org> | 2019-12-06 21:41:42 -0700 |
|---|---|---|
| committer | Bin Meng <bmeng.cn@gmail.com> | 2019-12-15 11:44:08 +0800 |
| commit | fa11fe1b03a57e00073986b74813a74aa5b89290 (patch) | |
| tree | bb85d22dbbe04d704a6bf4ecc7d6464ee067ff34 /drivers/i2c | |
| parent | 8d72d5bf08488ff28a8ed27389dae8a169c39190 (diff) | |
i2c: designware: Support use in SPL
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>
Diffstat (limited to 'drivers/i2c')
| -rw-r--r-- | drivers/i2c/designware_i2c_pci.c | 43 |
1 files changed, 40 insertions, 3 deletions
diff --git a/drivers/i2c/designware_i2c_pci.c b/drivers/i2c/designware_i2c_pci.c index 8d6bb37f5c..bb1f809af3 100644 --- a/drivers/i2c/designware_i2c_pci.c +++ b/drivers/i2c/designware_i2c_pci.c @@ -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, |