diff options
| -rw-r--r-- | drivers/i2c/designware_i2c.c | 118 |
1 files changed, 106 insertions, 12 deletions
diff --git a/drivers/i2c/designware_i2c.c b/drivers/i2c/designware_i2c.c index d653eff..0c7cd0b 100644 --- a/drivers/i2c/designware_i2c.c +++ b/drivers/i2c/designware_i2c.c @@ -8,11 +8,32 @@ #include <common.h> #include <dm.h> #include <i2c.h> +#include <pci.h> #include <asm/io.h> #include "designware_i2c.h" +struct dw_scl_sda_cfg { + u32 ss_hcnt; + u32 fs_hcnt; + u32 ss_lcnt; + u32 fs_lcnt; + u32 sda_hold; +}; + +#ifdef CONFIG_X86 +/* BayTrail HCNT/LCNT/SDA hold time */ +static struct dw_scl_sda_cfg byt_config = { + .ss_hcnt = 0x200, + .fs_hcnt = 0x55, + .ss_lcnt = 0x200, + .fs_lcnt = 0x99, + .sda_hold = 0x6, +}; +#endif + struct dw_i2c { struct i2c_regs *regs; + struct dw_scl_sda_cfg *scl_sda_cfg; }; static void dw_i2c_enable(struct i2c_regs *i2c_base, bool enable) @@ -43,6 +64,7 @@ static void dw_i2c_enable(struct i2c_regs *i2c_base, bool enable) * Set the i2c speed. */ static unsigned int __dw_i2c_set_bus_speed(struct i2c_regs *i2c_base, + struct dw_scl_sda_cfg *scl_sda_cfg, unsigned int speed) { unsigned int cntl; @@ -62,34 +84,55 @@ static unsigned int __dw_i2c_set_bus_speed(struct i2c_regs *i2c_base, cntl = (readl(&i2c_base->ic_con) & (~IC_CON_SPD_MSK)); switch (i2c_spd) { +#ifndef CONFIG_X86 /* No High-speed for BayTrail yet */ case IC_SPEED_MODE_MAX: - cntl |= IC_CON_SPD_HS; - hcnt = (IC_CLK * MIN_HS_SCL_HIGHTIME) / NANO_TO_MICRO; + cntl |= IC_CON_SPD_SS; + if (scl_sda_cfg) { + hcnt = scl_sda_cfg->fs_hcnt; + lcnt = scl_sda_cfg->fs_lcnt; + } else { + hcnt = (IC_CLK * MIN_HS_SCL_HIGHTIME) / NANO_TO_MICRO; + lcnt = (IC_CLK * MIN_HS_SCL_LOWTIME) / NANO_TO_MICRO; + } writel(hcnt, &i2c_base->ic_hs_scl_hcnt); - lcnt = (IC_CLK * MIN_HS_SCL_LOWTIME) / NANO_TO_MICRO; writel(lcnt, &i2c_base->ic_hs_scl_lcnt); break; +#endif case IC_SPEED_MODE_STANDARD: cntl |= IC_CON_SPD_SS; - hcnt = (IC_CLK * MIN_SS_SCL_HIGHTIME) / NANO_TO_MICRO; + if (scl_sda_cfg) { + hcnt = scl_sda_cfg->ss_hcnt; + lcnt = scl_sda_cfg->ss_lcnt; + } else { + hcnt = (IC_CLK * MIN_SS_SCL_HIGHTIME) / NANO_TO_MICRO; + lcnt = (IC_CLK * MIN_SS_SCL_LOWTIME) / NANO_TO_MICRO; + } writel(hcnt, &i2c_base->ic_ss_scl_hcnt); - lcnt = (IC_CLK * MIN_SS_SCL_LOWTIME) / NANO_TO_MICRO; writel(lcnt, &i2c_base->ic_ss_scl_lcnt); break; case IC_SPEED_MODE_FAST: default: cntl |= IC_CON_SPD_FS; - hcnt = (IC_CLK * MIN_FS_SCL_HIGHTIME) / NANO_TO_MICRO; + if (scl_sda_cfg) { + hcnt = scl_sda_cfg->fs_hcnt; + lcnt = scl_sda_cfg->fs_lcnt; + } else { + hcnt = (IC_CLK * MIN_FS_SCL_HIGHTIME) / NANO_TO_MICRO; + lcnt = (IC_CLK * MIN_FS_SCL_LOWTIME) / NANO_TO_MICRO; + } writel(hcnt, &i2c_base->ic_fs_scl_hcnt); - lcnt = (IC_CLK * MIN_FS_SCL_LOWTIME) / NANO_TO_MICRO; writel(lcnt, &i2c_base->ic_fs_scl_lcnt); break; } writel(cntl, &i2c_base->ic_con); + /* Configure SDA Hold Time if required */ + if (scl_sda_cfg) + writel(scl_sda_cfg->sda_hold, &i2c_base->ic_sda_hold); + /* Enable back i2c now speed set */ dw_i2c_enable(i2c_base, true); @@ -316,7 +359,7 @@ static void __dw_i2c_init(struct i2c_regs *i2c_base, int speed, int slaveaddr) writel(IC_TX_TL, &i2c_base->ic_tx_tl); writel(IC_STOP_DET, &i2c_base->ic_intr_mask); #ifndef CONFIG_DM_I2C - __dw_i2c_set_bus_speed(i2c_base, speed); + __dw_i2c_set_bus_speed(i2c_base, NULL, speed); writel(slaveaddr, &i2c_base->ic_sar); #endif @@ -357,7 +400,7 @@ static unsigned int dw_i2c_set_bus_speed(struct i2c_adapter *adap, unsigned int speed) { adap->speed = speed; - return __dw_i2c_set_bus_speed(i2c_get_base(adap), speed); + return __dw_i2c_set_bus_speed(i2c_get_base(adap), NULL, speed); } static void dw_i2c_init(struct i2c_adapter *adap, int speed, int slaveaddr) @@ -448,7 +491,7 @@ static int designware_i2c_set_bus_speed(struct udevice *bus, unsigned int speed) { struct dw_i2c *i2c = dev_get_priv(bus); - return __dw_i2c_set_bus_speed(i2c->regs, speed); + return __dw_i2c_set_bus_speed(i2c->regs, i2c->scl_sda_cfg, speed); } static int designware_i2c_probe_chip(struct udevice *bus, uint chip_addr, @@ -471,14 +514,48 @@ static int designware_i2c_probe(struct udevice *bus) { struct dw_i2c *priv = dev_get_priv(bus); - /* Save base address from device-tree */ - priv->regs = (struct i2c_regs *)dev_get_addr(bus); + if (device_is_on_pci_bus(bus)) { +#ifdef CONFIG_DM_PCI + /* Save base address from PCI BAR */ + priv->regs = (struct i2c_regs *) + dm_pci_map_bar(bus, PCI_BASE_ADDRESS_0, PCI_REGION_MEM); +#ifdef CONFIG_X86 + /* Use BayTrail specific timing values */ + priv->scl_sda_cfg = &byt_config; +#endif +#endif + } else { + priv->regs = (struct i2c_regs *)dev_get_addr_ptr(bus); + } __dw_i2c_init(priv->regs, 0, 0); return 0; } +static int designware_i2c_bind(struct udevice *dev) +{ + static int num_cards; + char name[20]; + + /* Create a unique device name for PCI type devices */ + if (device_is_on_pci_bus(dev)) { + /* + * ToDo: + * Setting req_seq in the driver is probably not recommended. + * But without a DT alias the number is not configured. And + * using this driver is impossible for PCIe I2C devices. + * This can be removed, once a better (correct) way for this + * is found and implemented. + */ + dev->req_seq = num_cards; + sprintf(name, "i2c_designware#%u", num_cards++); + device_set_name(dev, name); + } + + return 0; +} + static const struct dm_i2c_ops designware_i2c_ops = { .xfer = designware_i2c_xfer, .probe_chip = designware_i2c_probe_chip, @@ -494,9 +571,26 @@ U_BOOT_DRIVER(i2c_designware) = { .name = "i2c_designware", .id = UCLASS_I2C, .of_match = designware_i2c_ids, + .bind = designware_i2c_bind, .probe = designware_i2c_probe, .priv_auto_alloc_size = sizeof(struct dw_i2c), .ops = &designware_i2c_ops, }; +#ifdef CONFIG_X86 +static struct pci_device_id designware_pci_supported[] = { + /* Intel BayTrail has 7 I2C controller located on the PCI bus */ + { PCI_VDEVICE(INTEL, 0x0f41) }, + { PCI_VDEVICE(INTEL, 0x0f42) }, + { PCI_VDEVICE(INTEL, 0x0f43) }, + { PCI_VDEVICE(INTEL, 0x0f44) }, + { PCI_VDEVICE(INTEL, 0x0f45) }, + { PCI_VDEVICE(INTEL, 0x0f46) }, + { PCI_VDEVICE(INTEL, 0x0f47) }, + {}, +}; + +U_BOOT_PCI_DEVICE(i2c_designware, designware_pci_supported); +#endif + #endif /* CONFIG_DM_I2C */ |