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authorNico Huber <nico.huber@secunet.com>2017-07-12 17:59:16 +0200
committerMartin Roth <martinroth@google.com>2017-08-14 18:07:30 +0000
commit029dfff30cc468b3e21c2004a135d3380a8c20e6 (patch)
treee4650cddc8c7fbe6c31608ba35235474cff8cf9e /src/soc/broadcom/cygnus/i2c.c
parent673e014fab7b6640942c141a4d2d2dc23e93d7a0 (diff)
downloadcoreboot-029dfff30cc468b3e21c2004a135d3380a8c20e6.tar.xz
i2c: Move to Linux like `struct i2c_msg`
Our current struct for I2C segments `i2c_seg` was close to being compa- tible to the Linux version `i2c_msg`, close to being compatible to SMBus and close to being readable (e.g. what was `chip` supposed to mean?) but turned out to be hard to fix. Instead of extending it in a backwards compatible way (and not touching current controller drivers), replace it with a Linux source compatible `struct i2c_msg` and patch all the drivers and users with Coccinelle. The new `struct i2c_msg` should ease porting drivers from Linux and help to write SMBus compatible controller drivers. Beside integer type changes, the field `read` is replaced with a generic field `flags` and `chip` is renamed to `slave`. Patched with Coccinelle using the clumsy spatch below and some manual changes: * Nested struct initializers and one field access skipped by Coccinelle. * Removed assumption in the code that I2C_M_RD is 1. * In `i2c.h`, changed all occurences of `chip` to `slave`. @@ @@ -struct i2c_seg +struct i2c_msg @@ identifier msg; expression e; @@ ( struct i2c_msg msg = { - .read = 0, + .flags = 0, }; | struct i2c_msg msg = { - .read = 1, + .flags = I2C_M_RD, }; | struct i2c_msg msg = { - .chip = e, + .slave = e, }; ) @@ struct i2c_msg msg; statement S1, S2; @@ ( -if (msg.read) +if (msg.flags & I2C_M_RD) S1 else S2 | -if (msg.read) +if (msg.flags & I2C_M_RD) S1 ) @@ struct i2c_msg *msg; statement S1, S2; @@ ( -if (msg->read) +if (msg->flags & I2C_M_RD) S1 else S2 | -if (msg->read) +if (msg->flags & I2C_M_RD) S1 ) @@ struct i2c_msg msg; expression e; @@ ( -msg.read = 0; +msg.flags = 0; | -msg.read = 1; +msg.flags = I2C_M_RD; | -msg.read = e; +msg.flags = e ? I2C_M_RD : 0; | -!!(msg.read) +(msg.flags & I2C_M_RD) | -(msg.read) +(msg.flags & I2C_M_RD) ) @@ struct i2c_msg *msg; expression e; @@ ( -msg->read = 0; +msg->flags = 0; | -msg->read = 1; +msg->flags = I2C_M_RD; | -msg->read = e; +msg->flags = e ? I2C_M_RD : 0; | -!!(msg->read) +(msg->flags & I2C_M_RD) | -(msg->read) +(msg->flags & I2C_M_RD) ) @@ struct i2c_msg msg; @@ -msg.chip +msg.slave @@ struct i2c_msg *msg; expression e; @@ -msg[e].chip +msg[e].slave @ slave disable ptr_to_array @ struct i2c_msg *msg; @@ -msg->chip +msg->slave Change-Id: Ifd7cabf0a18ffd7a1def25d1d7059b713d0b7ea9 Signed-off-by: Nico Huber <nico.huber@secunet.com> Reviewed-on: https://review.coreboot.org/20542 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Aaron Durbin <adurbin@chromium.org> Reviewed-by: Werner Zeh <werner.zeh@siemens.com> Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com> Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Diffstat (limited to 'src/soc/broadcom/cygnus/i2c.c')
-rw-r--r--src/soc/broadcom/cygnus/i2c.c18
1 files changed, 10 insertions, 8 deletions
diff --git a/src/soc/broadcom/cygnus/i2c.c b/src/soc/broadcom/cygnus/i2c.c
index fe14000ce9..bc43a8886f 100644
--- a/src/soc/broadcom/cygnus/i2c.c
+++ b/src/soc/broadcom/cygnus/i2c.c
@@ -103,13 +103,14 @@ static void i2c_flush_fifo(struct cygnus_i2c_regs *reg_addr)
I2C_MASTER_RX_FIFO_FLUSH | I2C_MASTER_TX_FIFO_FLUSH);
}
-static int i2c_write(struct cygnus_i2c_regs *reg_addr, struct i2c_seg *segment)
+static int i2c_write(struct cygnus_i2c_regs *reg_addr,
+ struct i2c_msg *segment)
{
uint8_t *data = segment->buf;
unsigned int val, status;
int i, ret;
- write32(&reg_addr->i2c_master_data_wr, segment->chip << 1);
+ write32(&reg_addr->i2c_master_data_wr, segment->slave << 1);
for (i = 0; i < segment->len; i++) {
val = data[i];
@@ -150,13 +151,13 @@ flush_fifo:
return ret;
}
-static int i2c_read(struct cygnus_i2c_regs *reg_addr, struct i2c_seg *segment)
+static int i2c_read(struct cygnus_i2c_regs *reg_addr, struct i2c_msg *segment)
{
uint8_t *data = segment->buf;
int i, ret;
unsigned int status;
- write32(&reg_addr->i2c_master_data_wr, segment->chip << 1 | 1);
+ write32(&reg_addr->i2c_master_data_wr, segment->slave << 1 | 1);
/*
* Now we can activate the transfer. Specify the number of bytes to read
@@ -190,7 +191,7 @@ flush_fifo:
}
static int i2c_do_xfer(struct cygnus_i2c_regs *reg_addr,
- struct i2c_seg *segment)
+ struct i2c_msg *segment)
{
int ret;
@@ -206,7 +207,7 @@ static int i2c_do_xfer(struct cygnus_i2c_regs *reg_addr,
return EBUSY;
}
- if (segment->read)
+ if (segment->flags & I2C_M_RD)
ret = i2c_read(reg_addr, segment);
else
ret = i2c_write(reg_addr, segment);
@@ -214,12 +215,13 @@ static int i2c_do_xfer(struct cygnus_i2c_regs *reg_addr,
return ret;
}
-int platform_i2c_transfer(unsigned bus, struct i2c_seg *segments, int seg_count)
+int platform_i2c_transfer(unsigned bus, struct i2c_msg *segments,
+ int seg_count)
{
int i;
int res = 0;
struct cygnus_i2c_regs *regs = i2c_bus[bus];
- struct i2c_seg *seg = segments;
+ struct i2c_msg *seg = segments;
for (i = 0; i < seg_count; i++, seg++) {
res = i2c_do_xfer(regs, seg);