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authorStefan Roese <sr@denx.de>2016-04-21 08:19:38 +0200
committerHeiko Schocher <hs@denx.de>2016-04-25 07:31:16 +0200
commit1c8b089b45cddeef6fb76d9abb8d48601ec5e0a1 (patch)
tree76a5ed1433cbe409d20b49f72e508c0caa552c69
parente209828cbd4b8d896380c710bac82c5f7bd1ad72 (diff)
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i2c: designware_i2c: Add dw_i2c_enable() helper function
dw_i2c_enable() is used to dis-/en-able the I2C controller. It makes sense to add such a function, as the controller is dis-/en-abled multiple times in the code. Additionally, this function now checks, if the controller is really dis-/en-abled. This code is copied from the Linux I2C driver version. Signed-off-by: Stefan Roese <sr@denx.de> Cc: Simon Glass <sjg@chromium.org> Cc: Bin Meng <bmeng.cn@gmail.com> Cc: Marek Vasut <marex@denx.de> Cc: Heiko Schocher <hs@denx.de> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
-rw-r--r--drivers/i2c/designware_i2c.c47
1 files changed, 27 insertions, 20 deletions
diff --git a/drivers/i2c/designware_i2c.c b/drivers/i2c/designware_i2c.c
index e768cde..d5b3e29 100644
--- a/drivers/i2c/designware_i2c.c
+++ b/drivers/i2c/designware_i2c.c
@@ -34,6 +34,27 @@ static struct i2c_regs *i2c_get_base(struct i2c_adapter *adap)
return NULL;
}
+static void dw_i2c_enable(struct i2c_regs *i2c_base, bool enable)
+{
+ u32 ena = enable ? IC_ENABLE_0B : 0;
+ int timeout = 100;
+
+ do {
+ writel(ena, &i2c_base->ic_enable);
+ if ((readl(&i2c_base->ic_enable_status) & IC_ENABLE_0B) == ena)
+ return;
+
+ /*
+ * Wait 10 times the signaling period of the highest I2C
+ * transfer supported by the driver (for 400KHz this is
+ * 25us) as described in the DesignWare I2C databook.
+ */
+ udelay(25);
+ } while (timeout--);
+
+ printf("timeout in %sabling I2C adapter\n", enable ? "en" : "dis");
+}
+
/*
* set_speed - Set the i2c speed mode (standard, high, fast)
* @i2c_spd: required i2c speed mode
@@ -45,12 +66,9 @@ static void set_speed(struct i2c_adapter *adap, int i2c_spd)
struct i2c_regs *i2c_base = i2c_get_base(adap);
unsigned int cntl;
unsigned int hcnt, lcnt;
- unsigned int enbl;
/* to set speed cltr must be disabled */
- enbl = readl(&i2c_base->ic_enable);
- enbl &= ~IC_ENABLE_0B;
- writel(enbl, &i2c_base->ic_enable);
+ dw_i2c_enable(i2c_base, false);
cntl = (readl(&i2c_base->ic_con) & (~IC_CON_SPD_MSK));
@@ -84,8 +102,7 @@ static void set_speed(struct i2c_adapter *adap, int i2c_spd)
writel(cntl, &i2c_base->ic_con);
/* Enable back i2c now speed set */
- enbl |= IC_ENABLE_0B;
- writel(enbl, &i2c_base->ic_enable);
+ dw_i2c_enable(i2c_base, true);
}
/*
@@ -123,12 +140,9 @@ static void dw_i2c_init(struct i2c_adapter *adap, int speed,
int slaveaddr)
{
struct i2c_regs *i2c_base = i2c_get_base(adap);
- unsigned int enbl;
/* Disable i2c */
- enbl = readl(&i2c_base->ic_enable);
- enbl &= ~IC_ENABLE_0B;
- writel(enbl, &i2c_base->ic_enable);
+ dw_i2c_enable(i2c_base, false);
writel((IC_CON_SD | IC_CON_SPD_FS | IC_CON_MM), &i2c_base->ic_con);
writel(IC_RX_TL, &i2c_base->ic_rx_tl);
@@ -138,9 +152,7 @@ static void dw_i2c_init(struct i2c_adapter *adap, int speed,
writel(slaveaddr, &i2c_base->ic_sar);
/* Enable i2c */
- enbl = readl(&i2c_base->ic_enable);
- enbl |= IC_ENABLE_0B;
- writel(enbl, &i2c_base->ic_enable);
+ dw_i2c_enable(i2c_base, true);
}
/*
@@ -152,19 +164,14 @@ static void dw_i2c_init(struct i2c_adapter *adap, int speed,
static void i2c_setaddress(struct i2c_adapter *adap, unsigned int i2c_addr)
{
struct i2c_regs *i2c_base = i2c_get_base(adap);
- unsigned int enbl;
/* Disable i2c */
- enbl = readl(&i2c_base->ic_enable);
- enbl &= ~IC_ENABLE_0B;
- writel(enbl, &i2c_base->ic_enable);
+ dw_i2c_enable(i2c_base, false);
writel(i2c_addr, &i2c_base->ic_tar);
/* Enable i2c */
- enbl = readl(&i2c_base->ic_enable);
- enbl |= IC_ENABLE_0B;
- writel(enbl, &i2c_base->ic_enable);
+ dw_i2c_enable(i2c_base, true);
}
/*