Patchwork [U-Boot,v2,19/21] arm:trats:pmic: Power consumption reduction state for Samsung's TRATS board

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Submitter Łukasz Majewski
Date Oct. 5, 2012, 8:16 a.m.
Message ID <1349425003-32523-20-git-send-email-l.majewski@samsung.com>
Download mbox | patch
Permalink /patch/189445/
State Changes Requested
Delegated to: Stefano Babic
Headers show

Comments

Łukasz Majewski - Oct. 5, 2012, 8:16 a.m.
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
---
 board/samsung/trats/trats.c |   41 +++++++++++++++++++++++++++++++++++++++++
 1 files changed, 41 insertions(+), 0 deletions(-)

Patch

diff --git a/board/samsung/trats/trats.c b/board/samsung/trats/trats.c
index d976940..f6a62d0 100644
--- a/board/samsung/trats/trats.c
+++ b/board/samsung/trats/trats.c
@@ -89,6 +89,47 @@  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 */
+	writel(0x0, &pwr->arm_core1_configuration);
+
+	/* Change the APLL frequency */
+	writel(0xa0c80604, &clk->apll_con0);
+	/* Change CPU0 clock divider */
+	writel(0x00000100, &clk->div_cpu0);
+	/* CLK_DIV_STAT_CPU0 - wait until clock gets stable */
+	while (readl(&clk->div_stat_cpu0) & 0x1111111)
+		;
+
+	/* Change clock divider ratio for DMC */
+	writel(0x13113117, &clk->div_dmc0);
+	while (readl(&clk->div_stat_dmc0) & 0x11111111)
+		;
+
+	/* 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");