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authorDavid Hendricks <dhendrix@chromium.org>2013-02-03 20:47:38 -0800
committerRonald G. Minnich <rminnich@gmail.com>2013-02-04 06:08:20 +0100
commit2354ef8869a287cf4c7de792c17485ad82b026cf (patch)
treedab61044490e3d44214dcc7e8a10f858bed956f8 /src/mainboard
parentaa6701c090c013c1783b138e02277090615508ee (diff)
downloadcoreboot-2354ef8869a287cf4c7de792c17485ad82b026cf.tar.xz
exynos/snow: get rid of board-specific arbitration code
Snow's AP, EC, PMU, and smarty battery share a bus. Both the AP and EC can act as a master, so to avoid conflicts an arbitration mechanism consisting of two GPIOs is used. By default, the AP "owns" the bus unless it is off (in which case the EC doesn't monitor the arbitration pins). This means the boot firmware does not need to worry about these lines. The payload may if it needs to communicate with the EC, though. In any case, board-specific bus arbitration logic does not belong in a low-level driver that is supposed to be generic for an entire CPU family. If the payload needs to talk to the EC, we'll deal with it there. Change-Id: I0774d4592af2b21b6ad668441532c5ceab988404 Signed-off-by: David Hendricks <dhendrix@chromium.org> Reviewed-on: http://review.coreboot.org/2272 Tested-by: build bot (Jenkins) Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
Diffstat (limited to 'src/mainboard')
-rw-r--r--src/mainboard/google/snow/bootblock.c14
-rw-r--r--src/mainboard/google/snow/smdk5250_spl.c15
2 files changed, 0 insertions, 29 deletions
diff --git a/src/mainboard/google/snow/bootblock.c b/src/mainboard/google/snow/bootblock.c
index fd3c505b1e..58d347d5a6 100644
--- a/src/mainboard/google/snow/bootblock.c
+++ b/src/mainboard/google/snow/bootblock.c
@@ -649,15 +649,8 @@ int i2c_read(uchar chip, uint addr, int alen, uchar *buffer, int len)
#endif
if (!i2c)
return -1;
-#if 0
- if (board_i2c_claim_bus(i2c->node)) {
- debug("I2C cannot claim bus %d\n", i2c->bus_num);
- return -1;
- }
-#endif
ret = i2c_transfer(i2c->regs, I2C_READ, chip << 1, &xaddr[4 - alen],
alen, buffer, len);
- //board_i2c_release_bus(i2c->node);
if (ret) {
//debug("I2c read: failed %d\n", ret);
return 1;
@@ -702,15 +695,8 @@ int i2c_write(uchar chip, uint addr, int alen, uchar *buffer, int len)
i2c = &i2c0;
if (!i2c)
return -1;
-#if 0
- if (board_i2c_claim_bus(i2c->node)) {
- //debug("I2C cannot claim bus %d\n", i2c->bus_num);
- return -1;
- }
-#endif
ret = i2c_transfer(i2c->regs, I2C_WRITE, chip << 1, &xaddr[4 - alen],
alen, buffer, len);
- //board_i2c_release_bus(i2c->node);
return ret != 0;
}
diff --git a/src/mainboard/google/snow/smdk5250_spl.c b/src/mainboard/google/snow/smdk5250_spl.c
index 0dbd4e1165..33f27b17db 100644
--- a/src/mainboard/google/snow/smdk5250_spl.c
+++ b/src/mainboard/google/snow/smdk5250_spl.c
@@ -87,18 +87,3 @@ int board_wakeup_permitted(void)
return !is_bad_wake;
}
-
-/*
- * TODO(sjg@chromium.org):
- * Declared there here for SPL, since there is no core i2c subsystem and
- * cmd_i2c.c is not included.
- */
-void board_i2c_release_bus(int node)
-{
-}
-
-int board_i2c_claim_bus(int node)
-{
- /* EC is not allowed to touch the bus until we enter U-Boot */
- return 0;
-}