[U-Boot] [PATCH 4/6 v2] i2c: designware_i2c: Prepare for DM driver conversion

Stefan Roese
2016-03-23T05:46:26Z

This patch prepares the designware I2C driver for the DM conversion.
This is mainly done by removing struct i2c_adapter from the functions
that shall be used by the DM driver version as well.

Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Cc: Marek Vasut <marex@denx.de>
Cc: Heiko Schocher <hs@denx.de>
---
v2:
- Added Reviewed-by from Bin

drivers/i2c/designware_i2c.c | 173 ++++++++++++++++++++++---------------------
1 file changed, 90 insertions(+), 83 deletions(-)

diff --git a/drivers/i2c/designware_i2c.c b/drivers/i2c/designware_i2c.c
index aac56a7..8dd1de9 100644
--- a/drivers/i2c/designware_i2c.c
+++ b/drivers/i2c/designware_i2c.c
@@ -10,30 +10,6 @@
#include <asm/io.h>
#include "designware_i2c.h"

-static struct i2c_regs *i2c_get_base(struct i2c_adapter *adap)
-{
- switch (adap->hwadapnr) {
-#if CONFIG_SYS_I2C_BUS_MAX >= 4
- case 3:
- return (struct i2c_regs *)CONFIG_SYS_I2C_BASE3;
-#endif
-#if CONFIG_SYS_I2C_BUS_MAX >= 3
- case 2:
- return (struct i2c_regs *)CONFIG_SYS_I2C_BASE2;
-#endif
-#if CONFIG_SYS_I2C_BUS_MAX >= 2
- case 1:
- return (struct i2c_regs *)CONFIG_SYS_I2C_BASE1;
-#endif
- case 0:
- return (struct i2c_regs *)CONFIG_SYS_I2C_BASE;
- default:
- printf("Wrong I2C-adapter number %d\n", adap->hwadapnr);
- }
-
- return NULL;
-}
-
static void dw_i2c_enable(struct i2c_regs *i2c_base, bool enable)
{
int timeout = 100;
@@ -60,10 +36,9 @@ 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_adapter *adap,
- unsigned int speed)
+static unsigned int __dw_i2c_set_bus_speed(struct i2c_regs *i2c_base,
+ unsigned int speed)
{
- struct i2c_regs *i2c_base = i2c_get_base(adap);
unsigned int cntl;
unsigned int hcnt, lcnt;
int i2c_spd;
@@ -112,47 +87,17 @@ static unsigned int dw_i2c_set_bus_speed(struct i2c_adapter *adap,
/* Enable back i2c now speed set */
dw_i2c_enable(i2c_base, true);

- adap->speed = speed;
-
return 0;
}

/*
- * i2c_init - Init function
- * @speed: required i2c speed
- * @slaveaddr: slave address for the device
- *
- * Initialization function.
- */
-static void dw_i2c_init(struct i2c_adapter *adap, int speed,
- int slaveaddr)
-{
- struct i2c_regs *i2c_base = i2c_get_base(adap);
-
- /* Disable i2c */
- 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);
- writel(IC_TX_TL, &i2c_base->ic_tx_tl);
- dw_i2c_set_bus_speed(adap, speed);
- writel(IC_STOP_DET, &i2c_base->ic_intr_mask);
- writel(slaveaddr, &i2c_base->ic_sar);
-
- /* Enable i2c */
- dw_i2c_enable(i2c_base, true);
-}
-
-/*
* i2c_setaddress - Sets the target slave address
* @i2c_addr: target i2c address
*
* Sets the target slave address.
*/
-static void i2c_setaddress(struct i2c_adapter *adap, unsigned int i2c_addr)
+static void i2c_setaddress(struct i2c_regs *i2c_base, unsigned int i2c_addr)
{
- struct i2c_regs *i2c_base = i2c_get_base(adap);
-
/* Disable i2c */
dw_i2c_enable(i2c_base, false);

@@ -167,10 +112,8 @@ static void i2c_setaddress(struct i2c_adapter *adap, unsigned int i2c_addr)
*
* Flushes the i2c RX FIFO
*/
-static void i2c_flush_rxfifo(struct i2c_adapter *adap)
+static void i2c_flush_rxfifo(struct i2c_regs *i2c_base)
{
- struct i2c_regs *i2c_base = i2c_get_base(adap);
-
while (readl(&i2c_base->ic_status) & IC_STATUS_RFNE)
readl(&i2c_base->ic_cmd_data);
}
@@ -180,9 +123,8 @@ static void i2c_flush_rxfifo(struct i2c_adapter *adap)
*
* Waits for bus busy
*/
-static int i2c_wait_for_bb(struct i2c_adapter *adap)
+static int i2c_wait_for_bb(struct i2c_regs *i2c_base)
{
- struct i2c_regs *i2c_base = i2c_get_base(adap);
unsigned long start_time_bb = get_timer(0);

while ((readl(&i2c_base->ic_status) & IC_STATUS_MA) ||
@@ -196,15 +138,13 @@ static int i2c_wait_for_bb(struct i2c_adapter *adap)
return 0;
}

-static int i2c_xfer_init(struct i2c_adapter *adap, uchar chip, uint addr,
+static int i2c_xfer_init(struct i2c_regs *i2c_base, uchar chip, uint addr,
int alen)
{
- struct i2c_regs *i2c_base = i2c_get_base(adap);
-
- if (i2c_wait_for_bb(adap))
+ if (i2c_wait_for_bb(i2c_base))
return 1;

- i2c_setaddress(adap, chip);
+ i2c_setaddress(i2c_base, chip);
while (alen) {
alen--;
/* high byte address going out first */
@@ -214,9 +154,8 @@ static int i2c_xfer_init(struct i2c_adapter *adap, uchar chip, uint addr,
return 0;
}

-static int i2c_xfer_finish(struct i2c_adapter *adap)
+static int i2c_xfer_finish(struct i2c_regs *i2c_base)
{
- struct i2c_regs *i2c_base = i2c_get_base(adap);
ulong start_stop_det = get_timer(0);

while (1) {
@@ -228,12 +167,12 @@ static int i2c_xfer_finish(struct i2c_adapter *adap)
}
}

- if (i2c_wait_for_bb(adap)) {
+ if (i2c_wait_for_bb(i2c_base)) {
printf("Timed out waiting for bus\n");
return 1;
}

- i2c_flush_rxfifo(adap);
+ i2c_flush_rxfifo(i2c_base);

return 0;
}
@@ -248,10 +187,9 @@ static int i2c_xfer_finish(struct i2c_adapter *adap)
*
* Read from i2c memory.
*/
-static int dw_i2c_read(struct i2c_adapter *adap, u8 dev, uint addr,
- int alen, u8 *buffer, int len)
+static int __dw_i2c_read(struct i2c_regs *i2c_base, u8 dev, uint addr,
+ int alen, u8 *buffer, int len)
{
- struct i2c_regs *i2c_base = i2c_get_base(adap);
unsigned long start_time_rx;

#ifdef CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW
@@ -273,7 +211,7 @@ static int dw_i2c_read(struct i2c_adapter *adap, u8 dev, uint addr,
addr);
#endif

- if (i2c_xfer_init(adap, dev, addr, alen))
+ if (i2c_xfer_init(i2c_base, dev, addr, alen))
return 1;

start_time_rx = get_timer(0);
@@ -293,7 +231,7 @@ static int dw_i2c_read(struct i2c_adapter *adap, u8 dev, uint addr,
}
}

- return i2c_xfer_finish(adap);
+ return i2c_xfer_finish(i2c_base);
}

/*
@@ -306,10 +244,9 @@ static int dw_i2c_read(struct i2c_adapter *adap, u8 dev, uint addr,
*
* Write to i2c memory.
*/
-static int dw_i2c_write(struct i2c_adapter *adap, u8 dev, uint addr,
- int alen, u8 *buffer, int len)
+static int __dw_i2c_write(struct i2c_regs *i2c_base, u8 dev, uint addr,
+ int alen, u8 *buffer, int len)
{
- struct i2c_regs *i2c_base = i2c_get_base(adap);
int nb = len;
unsigned long start_time_tx;

@@ -332,7 +269,7 @@ static int dw_i2c_write(struct i2c_adapter *adap, u8 dev, uint addr,
addr);
#endif

- if (i2c_xfer_init(adap, dev, addr, alen))
+ if (i2c_xfer_init(i2c_base, dev, addr, alen))
return 1;

start_time_tx = get_timer(0);
@@ -353,7 +290,76 @@ static int dw_i2c_write(struct i2c_adapter *adap, u8 dev, uint addr,
}
}

- return i2c_xfer_finish(adap);
+ return i2c_xfer_finish(i2c_base);
+}
+
+static struct i2c_regs *i2c_get_base(struct i2c_adapter *adap)
+{
+ switch (adap->hwadapnr) {
+#if CONFIG_SYS_I2C_BUS_MAX >= 4
+ case 3:
+ return (struct i2c_regs *)CONFIG_SYS_I2C_BASE3;
+#endif
+#if CONFIG_SYS_I2C_BUS_MAX >= 3
+ case 2:
+ return (struct i2c_regs *)CONFIG_SYS_I2C_BASE2;
+#endif
+#if CONFIG_SYS_I2C_BUS_MAX >= 2
+ case 1:
+ return (struct i2c_regs *)CONFIG_SYS_I2C_BASE1;
+#endif
+ case 0:
+ return (struct i2c_regs *)CONFIG_SYS_I2C_BASE;
+ default:
+ printf("Wrong I2C-adapter number %d\n", adap->hwadapnr);
+ }
+
+ return NULL;
+}
+
+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);
+}
+
+/*
+ * i2c_init - Init function
+ * @speed: required i2c speed
+ * @slaveaddr: slave address for the device
+ *
+ * Initialization function.
+ */
+static void dw_i2c_init(struct i2c_adapter *adap, int speed,
+ int slaveaddr)
+{
+ struct i2c_regs *i2c_base = i2c_get_base(adap);
+
+ /* Disable i2c */
+ 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);
+ writel(IC_TX_TL, &i2c_base->ic_tx_tl);
+ dw_i2c_set_bus_speed(adap, speed);
+ writel(IC_STOP_DET, &i2c_base->ic_intr_mask);
+ writel(slaveaddr, &i2c_base->ic_sar);
+
+ /* Enable i2c */
+ dw_i2c_enable(i2c_base, true);
+}
+
+static int dw_i2c_read(struct i2c_adapter *adap, u8 dev, uint addr,
+ int alen, u8 *buffer, int len)
+{
+ return __dw_i2c_read(i2c_get_base(adap), dev, addr, alen, buffer, len);
+}
+
+static int dw_i2c_write(struct i2c_adapter *adap, u8 dev, uint addr,
+ int alen, u8 *buffer, int len)
+{
+ return __dw_i2c_write(i2c_get_base(adap), dev, addr, alen, buffer, len);
}

/*
@@ -361,13 +367,14 @@ static int dw_i2c_write(struct i2c_adapter *adap, u8 dev, uint addr,
*/
static int dw_i2c_probe(struct i2c_adapter *adap, u8 dev)
{
+ struct i2c_regs *i2c_base = i2c_get_base(adap);
u32 tmp;
int ret;

/*
* Try to read the first location of the chip.
*/
- ret = dw_i2c_read(adap, dev, 0, 1, (uchar *)&tmp, 1);
+ ret = __dw_i2c_read(i2c_base, dev, 0, 1, (uchar *)&tmp, 1);
if (ret)
dw_i2c_init(adap, adap->speed, adap->slaveaddr);

--
2.7.4