diff options
| author | Ionela Voinescu <ionela.voinescu@imgtec.com> | 2015-01-30 17:05:15 +0000 |
|---|---|---|
| committer | Patrick Georgi <pgeorgi@google.com> | 2015-04-14 12:08:53 +0200 |
| commit | 256b1c397b21eb42dba3d2c8863ad483ef66d7e2 (patch) | |
| tree | 0daca303452824c56b9b7cab332435b725a47fa5 | |
| parent | 1d9515ff4c5f2339372ef055da5834827d0c91c4 (diff) | |
urara: increase drive strength for SPIM1 MFIOs
This change is made only to make sure there is a good
signal strength on the SPIM lines.
BUG=chrome-os-partner:31438
TEST=tested on Pistachio bring up board; works properly
BRANCH=none
Change-Id: I5b9427b14a407746fb5b707fa3b07a1a6774bfb1
Signed-off-by: Stefan Reinauer <reinauer@chromium.org>
Original-Commit-Id: e9d953283a5b43bf967128ca73db0e90c2df32df
Original-Change-Id: Ia589134cf0557613697d49fb0bdb1848af66f0e8
Original-Signed-off-by: Ionela Voinescu <ionela.voinescu@imgtec.com>
Original-Reviewed-on: https://chromium-review.googlesource.com/249732
Original-Reviewed-by: David Hendricks <dhendrix@chromium.org>
Reviewed-on: http://review.coreboot.org/9675
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
| -rw-r--r-- | src/mainboard/google/urara/bootblock.c | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/src/mainboard/google/urara/bootblock.c b/src/mainboard/google/urara/bootblock.c index b2f6b70cd4..814eb53631 100644 --- a/src/mainboard/google/urara/bootblock.c +++ b/src/mainboard/google/urara/bootblock.c @@ -22,10 +22,22 @@ #include <arch/io.h> #include <stdint.h> #include <soc/clocks.h> +#include <assert.h> #define PADS_FUNCTION_SELECT0_ADDR (0xB8101C00 + 0xC0) #define GPIO_BIT_EN_ADDR(bank) (0xB8101C00 + 0x200 + (0x24 * (bank))) +#define PAD_DRIVE_STRENGTH_ADDR(bank) (0xB8101C00 + 0x120 + (0x4 * (bank))) +#define MAX_NO_MFIOS 89 +#define PAD_DRIVE_STRENGTH_LENGTH 2 +#define PAD_DRIVE_STRENGTH_MASK 0x3 + +typedef enum { + DRIVE_STRENGTH_2mA = 0, + DRIVE_STRENGTH_4mA = 1, + DRIVE_STRENGTH_8mA = 2, + DRIVE_STRENGTH_12mA = 3 +} drive_strength; /* MFIO definitions for UART1 */ #define UART1_RXD_MFIO 59 @@ -47,6 +59,21 @@ #define I2C0_DATA_FUNCTION_MASK 0x1 #define I2C0_CLK_FUNCTION_MASK 0x1 +static void pad_drive_strength(u32 pad, drive_strength strength) +{ + u32 reg, drive_strength_shift; + + assert(pad <= MAX_NO_MFIOS); + assert(!(strength & ~(PAD_DRIVE_STRENGTH_MASK))); + + /* Set drive strength value */ + drive_strength_shift = (pad % 16) * PAD_DRIVE_STRENGTH_LENGTH; + reg = read32(PAD_DRIVE_STRENGTH_ADDR(pad / 16)); + reg &= ~(PAD_DRIVE_STRENGTH_MASK << drive_strength_shift); + reg |= strength << drive_strength_shift; + write32(PAD_DRIVE_STRENGTH_ADDR(pad / 16), reg); +} + static void uart1_mfio_setup(void) { u32 reg, mfio_mask; @@ -99,6 +126,14 @@ static void spim1_mfio_setup(void) */ reg |= mfio_mask << 16; write32(GPIO_BIT_EN_ADDR(0), reg); + + /* Set drive strength to maximum for these MFIOs */ + pad_drive_strength(SPIM1_CS0_MFIO, DRIVE_STRENGTH_12mA); + pad_drive_strength(SPIM1_D1_RXD_MFIO, DRIVE_STRENGTH_12mA); + pad_drive_strength(SPIM1_D0_TXD_MFIO, DRIVE_STRENGTH_12mA); + pad_drive_strength(SPIM1_D2_MFIO, DRIVE_STRENGTH_12mA); + pad_drive_strength(SPIM1_D3_MFIO, DRIVE_STRENGTH_12mA); + pad_drive_strength(SPIM1_MCLK_MFIO, DRIVE_STRENGTH_12mA); } static void i2c0_mfio_setup(void) |