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i2c: designware: Get clock rate from clock DM

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Get clock rate from clock DM if CONFIG_CLK is enabled.
Otherwise, uses IC_CLK define.

Signed-off-by: Ley Foon Tan <ley.foon.tan@intel.com>
Acked-by: Marek Vasut <marex@denx.de>
This commit is contained in:
Ley Foon Tan 2019-06-12 09:48:04 +08:00 • committed by Heiko Schocher
parent e3b93dcee8
commit 2d1e879c79
1 changed files with 45 additions and 10 deletions
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55
drivers/i2c/designware_i2c.c
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@ -4,6 +4,7 @@
* Vipin Kumar, ST Micoelectronics, vipin.kumar@st.com.
*/
#include <clk.h>
#include <common.h>
#include <dm.h>
#include <i2c.h>
@ -35,6 +36,9 @@ struct dw_i2c {
struct i2c_regs *regs;
struct dw_scl_sda_cfg *scl_sda_cfg;
struct reset_ctl_bulk resets;
#if CONFIG_IS_ENABLED(CLK)
struct clk clk;
#endif
};
#ifdef CONFIG_SYS_I2C_DW_ENABLE_STATUS_UNSUPPORTED
@ -78,7 +82,8 @@ static int dw_i2c_enable(struct i2c_regs *i2c_base, bool enable)
*/
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 speed,
unsigned int bus_mhz)
{
unsigned int cntl;
unsigned int hcnt, lcnt;
@ -108,8 +113,8 @@ static unsigned int __dw_i2c_set_bus_speed(struct i2c_regs *i2c_base,
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;
hcnt = (bus_mhz * MIN_HS_SCL_HIGHTIME) / NANO_TO_MICRO;
lcnt = (bus_mhz * MIN_HS_SCL_LOWTIME) / NANO_TO_MICRO;
}
writel(hcnt, &i2c_base->ic_hs_scl_hcnt);
writel(lcnt, &i2c_base->ic_hs_scl_lcnt);
@ -122,8 +127,8 @@ static unsigned int __dw_i2c_set_bus_speed(struct i2c_regs *i2c_base,
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;
hcnt = (bus_mhz * MIN_SS_SCL_HIGHTIME) / NANO_TO_MICRO;
lcnt = (bus_mhz * MIN_SS_SCL_LOWTIME) / NANO_TO_MICRO;
}
writel(hcnt, &i2c_base->ic_ss_scl_hcnt);
writel(lcnt, &i2c_base->ic_ss_scl_lcnt);
@ -136,8 +141,8 @@ static unsigned int __dw_i2c_set_bus_speed(struct i2c_regs *i2c_base,
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;
hcnt = (bus_mhz * MIN_FS_SCL_HIGHTIME) / NANO_TO_MICRO;
lcnt = (bus_mhz * MIN_FS_SCL_LOWTIME) / NANO_TO_MICRO;
}
writel(hcnt, &i2c_base->ic_fs_scl_hcnt);
writel(lcnt, &i2c_base->ic_fs_scl_lcnt);
@ -393,7 +398,7 @@ static int __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, NULL, speed);
__dw_i2c_set_bus_speed(i2c_base, NULL, speed, IC_CLK);
writel(slaveaddr, &i2c_base->ic_sar);
#endif
@ -438,7 +443,7 @@ 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), NULL, speed);
return __dw_i2c_set_bus_speed(i2c_get_base(adap), NULL, speed, IC_CLK);
}
static void dw_i2c_init(struct i2c_adapter *adap, int speed, int slaveaddr)
@ -528,8 +533,20 @@ static int designware_i2c_xfer(struct udevice *bus, struct i2c_msg *msg,
static int designware_i2c_set_bus_speed(struct udevice *bus, unsigned int speed)
{
struct dw_i2c *i2c = dev_get_priv(bus);
ulong rate;
return __dw_i2c_set_bus_speed(i2c->regs, i2c->scl_sda_cfg, speed);
#if CONFIG_IS_ENABLED(CLK)
rate = clk_get_rate(&i2c->clk);
if (IS_ERR_VALUE(rate))
return -EINVAL;
/* Convert to MHz */
rate /= 1000000;
#else
rate = IC_CLK;
#endif
return __dw_i2c_set_bus_speed(i2c->regs, i2c->scl_sda_cfg, speed,
rate);
}
static int designware_i2c_probe_chip(struct udevice *bus, uint chip_addr,
@ -573,6 +590,19 @@ static int designware_i2c_probe(struct udevice *bus)
else
reset_deassert_bulk(&priv->resets);
#if CONFIG_IS_ENABLED(CLK)
ret = clk_get_by_index(bus, 0, &priv->clk);
if (ret)
return ret;
ret = clk_enable(&priv->clk);
if (ret && ret != -ENOSYS && ret != -ENOTSUPP) {
clk_free(&priv->clk);
dev_err(bus, "failed to enable clock\n");
return ret;
}
#endif
return __dw_i2c_init(priv->regs, 0, 0);
}
@ -580,6 +610,11 @@ static int designware_i2c_remove(struct udevice *dev)
{
struct dw_i2c *priv = dev_get_priv(dev);
#if CONFIG_IS_ENABLED(CLK)
clk_disable(&priv->clk);
clk_free(&priv->clk);
#endif
return reset_release_bulk(&priv->resets);
}