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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/samsung/exynos5420
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/samsung/exynos5420')
-rw-r--r--src/soc/samsung/exynos5420/i2c.c17
1 files changed, 9 insertions, 8 deletions
diff --git a/src/soc/samsung/exynos5420/i2c.c b/src/soc/samsung/exynos5420/i2c.c
index 9a9b197cc5..ae9560ffdd 100644
--- a/src/soc/samsung/exynos5420/i2c.c
+++ b/src/soc/samsung/exynos5420/i2c.c
@@ -445,11 +445,12 @@ static int hsi2c_recvdata(struct hsi2c_regs *regs, uint8_t *data, int len)
return len ? -1 : 0;
}
-static int hsi2c_segment(struct i2c_seg *seg, struct hsi2c_regs *regs, int stop)
+static int hsi2c_segment(struct i2c_msg *seg, struct hsi2c_regs *regs,
+ int stop)
{
const uint32_t usi_ctl = Hsi2cFuncModeI2c | Hsi2cMaster;
- write32(&regs->i2c_addr, HSI2C_SLV_ADDR_MAS(seg->chip));
+ write32(&regs->i2c_addr, HSI2C_SLV_ADDR_MAS(seg->slave));
/*
* We really only want to stop after this transaction (I think) if the
@@ -461,7 +462,7 @@ static int hsi2c_segment(struct i2c_seg *seg, struct hsi2c_regs *regs, int stop)
uint32_t autoconf =
seg->len | Hsi2cMasterRun | Hsi2cStopAfterTrans;
- if (seg->read) {
+ if (seg->flags & I2C_M_RD) {
write32(&regs->usi_ctl, usi_ctl | Hsi2cRxchon);
write32(&regs->i2c_auto_conf, autoconf | Hsi2cReadWrite);
@@ -482,7 +483,7 @@ static int hsi2c_segment(struct i2c_seg *seg, struct hsi2c_regs *regs, int stop)
return 0;
}
-static int hsi2c_transfer(struct i2c_bus *i2c, struct i2c_seg *segments,
+static int hsi2c_transfer(struct i2c_bus *i2c, struct i2c_msg *segments,
int count)
{
struct hsi2c_regs *regs = i2c->hsregs;
@@ -627,7 +628,7 @@ static int i2c_recv_buf(struct i2c_regs *regs, uint8_t *data, int len)
return 0;
}
-int platform_i2c_transfer(unsigned bus, struct i2c_seg *segments, int count)
+int platform_i2c_transfer(unsigned bus, struct i2c_msg *segments, int count)
{
struct i2c_bus *i2c = &i2c_busses[bus];
if (i2c->is_highspeed)
@@ -643,12 +644,12 @@ int platform_i2c_transfer(unsigned bus, struct i2c_seg *segments, int count)
int i;
for (i = 0; i < count; i++) {
- struct i2c_seg *seg = &segments[i];
+ struct i2c_msg *seg = &segments[i];
- res = i2c_send_start(regs, seg->read, seg->chip);
+ res = i2c_send_start(regs, seg->flags & I2C_M_RD, seg->slave);
if (res)
break;
- if (seg->read)
+ if (seg->flags & I2C_M_RD)
res = i2c_recv_buf(regs, seg->buf, seg->len);
else
res = i2c_xmit_buf(regs, seg->buf, seg->len);