[U-Boot] [PATCH 17/20] tegra: nyan-big: Add additional clock and kernel init

Simon Glass
2015-02-17T22:29:51Z

We need to turn on all audio-related clocks for the kernel to boot.
Otherwise it will hang when trying to enable audio.

Also for Linux set up the ODMDATA and graphics driver video protection.

Signed-off-by: Simon Glass <sjg@chromium.org>
---

board/nvidia/nyan-big/nyan-big.c | 76 ++++++++++++++++++++++++++++++++++++++++
1 file changed, 76 insertions(+)

diff --git a/board/nvidia/nyan-big/nyan-big.c b/board/nvidia/nyan-big/nyan-big.c
index ae8874b..987ec7c 100644
--- a/board/nvidia/nyan-big/nyan-big.c
+++ b/board/nvidia/nyan-big/nyan-big.c
@@ -8,7 +8,12 @@
#include <common.h>
#include <errno.h>
#include <asm/gpio.h>
+#include <asm/io.h>
#include <asm/arch/pinmux.h>
+#include <asm/arch/clock.h>
+#include <asm/arch/mc.h>
+#include <asm/arch-tegra/clk_rst.h>
+#include <asm/arch-tegra/pmc.h>
#include <power/as3722.h>
#include <power/pmic.h>
#include "pinmux-config-nyan-big.h"
@@ -57,3 +62,74 @@ int tegra_lcd_pmic_init(int board_id)

return 0;
}
+
+/* Setup required information for Linux kernel */
+static void setup_kernel_info(void)
+{
+ struct pmc_ctlr *pmc = (void *)NV_PA_PMC_BASE;
+ struct mc_ctlr *mc = (void *)NV_PA_MC_BASE;
+
+ /*
+ * pmc.odmdata: [18:19]: console type, [15:17]: UART id
+ * TODO: Derive this from the current settings
+ */
+ writel(0x80080000, &pmc->pmc_scratch20);
+
+ /* The kernel graphics driver needs this region locked down */
+ writel(0, &mc->mc_video_protect_bom);
+ writel(0, &mc->mc_video_protect_size_mb);
+ writel(1, &mc->mc_video_protect_reg_ctrl);
+}
+
+/*
+ * We need to take ALL audio devices conntected to AHUB (AUDIO, APBIF,
+ * I2S, DAM, AMX, ADX, SPDIF, AFC) out of reset and enable the clocks.
+ * Otherwise reading AHUB devices will hang when the kernel boots.
+ */
+static void enable_required_clocks(void)
+{
+ static enum periph_id ids[] = {
+ PERIPH_ID_I2S0,
+ PERIPH_ID_I2S1,
+ PERIPH_ID_I2S2,
+ PERIPH_ID_I2S3,
+ PERIPH_ID_I2S4,
+ PERIPH_ID_AUDIO,
+ PERIPH_ID_APBIF,
+ PERIPH_ID_DAM0,
+ PERIPH_ID_DAM1,
+ PERIPH_ID_DAM2,
+ PERIPH_ID_AMX0,
+ PERIPH_ID_AMX1,
+ PERIPH_ID_ADX0,
+ PERIPH_ID_ADX1,
+ PERIPH_ID_SPDIF,
+ PERIPH_ID_AFC0,
+ PERIPH_ID_AFC1,
+ PERIPH_ID_AFC2,
+ PERIPH_ID_AFC3,
+ PERIPH_ID_AFC4,
+ PERIPH_ID_AFC5,
+ PERIPH_ID_EXTPERIPH1
+ };
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(ids); i++)
+ clock_enable(ids[i]);
+ udelay(2);
+ for (i = 0; i < ARRAY_SIZE(ids); i++)
+ reset_set_enable(ids[i], 0);
+}
+
+int nvidia_board_init(void)
+{
+ clock_start_periph_pll(PERIPH_ID_EXTPERIPH1, CLOCK_ID_OSC, 12000000);
+ clock_start_periph_pll(PERIPH_ID_I2S1, CLOCK_ID_OSC, 1500000);
+
+ /* For external MAX98090 audio codec */
+ clock_external_output(1);
+ setup_kernel_info();
+ enable_required_clocks();
+
+ return 0;
+}
--
2.2.0.rc0.207.ga3a616c