arm:trats:pmic: Power consumption reduction state for Samsung's TRATS board

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>

diff --git a/board/samsung/trats/trats.c b/board/samsung/trats/trats.c
index 94bf5c0..226b529 100644 (file)
--- 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");