When charging battery is necessary, the development board needs to be turned into low power mode for better efficiency.
Signed-off-by: Lukasz Majewski l.majewski@samsung.com Signed-off-by: Kyungmin Park kyungmin.park@samsung.com Cc: Minkyu Kang mk7.kang@samsung.com --- Changes for v2: - None Changes for v3: - None Changes for v4: - None Changes for v5: - None Changes for v6: - Explanation of a magic numbers (APLL, CLOCK) Changes for v7: - None --- board/samsung/trats/trats.c | 58 +++++++++++++++++++++++++++++++++++++++++++ 1 files changed, 58 insertions(+), 0 deletions(-)
diff --git a/board/samsung/trats/trats.c b/board/samsung/trats/trats.c index 94bf5c0..226b529 100644 --- a/board/samsung/trats/trats.c +++ b/board/samsung/trats/trats.c @@ -89,6 +89,64 @@ void i2c_init_board(void) s5p_gpio_direction_output(&gpio2->y4, 1, 1); }
+static void trats_low_power_mode(void) +{ + struct exynos4_clock *clk = + (struct exynos4_clock *)samsung_get_base_clock(); + struct exynos4_power *pwr = + (struct exynos4_power *)samsung_get_base_power(); + + /* Power down CORE1 */ + /* LOCAL_PWR_CFG [1:0] 0x3 EN, 0x0 DIS */ + writel(0x0, &pwr->arm_core1_configuration); + + /* Change the APLL frequency */ + /* ENABLE (1 enable) | LOCKED (1 locked) */ + /* [31] | [29] */ + /* FSEL | MDIV | PDIV | SDIV */ + /* [27] | [25:16] | [13:8] | [2:0] */ + writel(0xa0c80604, &clk->apll_con0); + + /* Change CPU0 clock divider */ + /* CORE2_RATIO | APLL_RATIO | PCLK_DBG_RATIO | ATB_RATIO */ + /* [30:28] | [26:24] | [22:20] | [18:16] */ + /* PERIPH_RATIO | COREM1_RATIO | COREM0_RATIO | CORE_RATIO */ + /* [14:12] | [10:8] | [6:4] | [2:0] */ + writel(0x00000100, &clk->div_cpu0); + + /* CLK_DIV_STAT_CPU0 - wait until clock gets stable (0 = stable) */ + while (readl(&clk->div_stat_cpu0) & 0x1111111) + continue; + + /* Change clock divider ratio for DMC */ + /* DMCP_RATIO | DMCD_RATIO */ + /* [22:20] | [18:16] */ + /* DMC_RATIO | DPHY_RATIO | ACP_PCLK_RATIO | ACP_RATIO */ + /* [14:12] | [10:8] | [6:4] | [2:0] */ + writel(0x13113117, &clk->div_dmc0); + + /* CLK_DIV_STAT_DMC0 - wait until clock gets stable (0 = stable) */ + while (readl(&clk->div_stat_dmc0) & 0x11111111) + continue; + + /* Turn off unnecessary power domains */ + writel(0x0, &pwr->xxti_configuration); /* XXTI */ + writel(0x0, &pwr->cam_configuration); /* CAM */ + writel(0x0, &pwr->tv_configuration); /* TV */ + writel(0x0, &pwr->mfc_configuration); /* MFC */ + writel(0x0, &pwr->g3d_configuration); /* G3D */ + writel(0x0, &pwr->gps_configuration); /* GPS */ + writel(0x0, &pwr->gps_alive_configuration); /* GPS_ALIVE */ + + /* Turn off unnecessary clocks */ + writel(0x0, &clk->gate_ip_cam); /* CAM */ + writel(0x0, &clk->gate_ip_tv); /* TV */ + writel(0x0, &clk->gate_ip_mfc); /* MFC */ + writel(0x0, &clk->gate_ip_g3d); /* G3D */ + writel(0x0, &clk->gate_ip_image); /* IMAGE */ + writel(0x0, &clk->gate_ip_gps); /* GPS */ +} + static int pmic_init_max8997(void) { struct pmic *p = pmic_get("MAX8997_PMIC");