summaryrefslogtreecommitdiffstats
path: root/arch/arm/cpu
diff options
context:
space:
mode:
authorHans de Goede <hdegoede@redhat.com>2015-01-14 19:56:33 +0100
committerHans de Goede <hdegoede@redhat.com>2015-01-22 12:34:55 +0100
commitdacc0881ac47660f8c5bc6ba6f6bbf2881f0364d (patch)
tree7303760d09379266b434d4ee3c0f5137bc851cde /arch/arm/cpu
parente35377d7265beb22de845a7a50aea789a9d57330 (diff)
downloadblackbird-obmc-uboot-dacc0881ac47660f8c5bc6ba6f6bbf2881f0364d.tar.gz
blackbird-obmc-uboot-dacc0881ac47660f8c5bc6ba6f6bbf2881f0364d.zip
sun9i: Add sun9i (A80) clock setup support
Add initial sun9i (A80) clock setup support, enough to get the uart + mmc going. Signed-off-by: Hans de Goede <hdegoede@redhat.com> Acked-by: Ian Campbell <ijc@hellion.org.uk>
Diffstat (limited to 'arch/arm/cpu')
-rw-r--r--arch/arm/cpu/armv7/sunxi/Makefile1
-rw-r--r--arch/arm/cpu/armv7/sunxi/clock_sun9i.c68
2 files changed, 69 insertions, 0 deletions
diff --git a/arch/arm/cpu/armv7/sunxi/Makefile b/arch/arm/cpu/armv7/sunxi/Makefile
index 1720f7db01..1c4b7633f9 100644
--- a/arch/arm/cpu/armv7/sunxi/Makefile
+++ b/arch/arm/cpu/armv7/sunxi/Makefile
@@ -22,6 +22,7 @@ obj-$(CONFIG_MACH_SUN5I) += clock_sun4i.o
obj-$(CONFIG_MACH_SUN6I) += clock_sun6i.o
obj-$(CONFIG_MACH_SUN7I) += clock_sun4i.o
obj-$(CONFIG_MACH_SUN8I) += clock_sun6i.o
+obj-$(CONFIG_MACH_SUN9I) += clock_sun9i.o
ifndef CONFIG_SPL_BUILD
ifdef CONFIG_ARMV7_PSCI
diff --git a/arch/arm/cpu/armv7/sunxi/clock_sun9i.c b/arch/arm/cpu/armv7/sunxi/clock_sun9i.c
new file mode 100644
index 0000000000..27179ba19c
--- /dev/null
+++ b/arch/arm/cpu/armv7/sunxi/clock_sun9i.c
@@ -0,0 +1,68 @@
+/*
+ * sun9i specific clock code
+ *
+ * (C) Copyright 2015 Hans de Goede <hdegoede@redhat.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <asm/arch/clock.h>
+#include <asm/arch/prcm.h>
+#include <asm/arch/sys_proto.h>
+
+void clock_init_uart(void)
+{
+ struct sunxi_ccm_reg *const ccm =
+ (struct sunxi_ccm_reg *)SUNXI_CCM_BASE;
+
+ /* open the clock for uart */
+ setbits_le32(&ccm->apb1_gate,
+ CLK_GATE_OPEN << (APB1_GATE_UART_SHIFT +
+ CONFIG_CONS_INDEX - 1));
+ /* deassert uart reset */
+ setbits_le32(&ccm->apb1_reset_cfg,
+ 1 << (APB1_RESET_UART_SHIFT +
+ CONFIG_CONS_INDEX - 1));
+
+ /* Dup with clock_init_safe(), drop once sun9i SPL support lands */
+ writel(PLL4_CFG_DEFAULT, &ccm->pll4_periph0_cfg);
+}
+
+int clock_twi_onoff(int port, int state)
+{
+ struct sunxi_ccm_reg *const ccm =
+ (struct sunxi_ccm_reg *)SUNXI_CCM_BASE;
+
+ if (port > 4)
+ return -1;
+
+ /* set the apb reset and clock gate for twi */
+ if (state) {
+ setbits_le32(&ccm->apb1_gate,
+ CLK_GATE_OPEN << (APB1_GATE_TWI_SHIFT + port));
+ setbits_le32(&ccm->apb1_reset_cfg,
+ 1 << (APB1_RESET_UART_SHIFT + port));
+ } else {
+ clrbits_le32(&ccm->apb1_reset_cfg,
+ 1 << (APB1_RESET_UART_SHIFT + port));
+ clrbits_le32(&ccm->apb1_gate,
+ CLK_GATE_OPEN << (APB1_GATE_TWI_SHIFT + port));
+ }
+
+ return 0;
+}
+
+unsigned int clock_get_pll4_periph0(void)
+{
+ struct sunxi_ccm_reg *const ccm =
+ (struct sunxi_ccm_reg *)SUNXI_CCM_BASE;
+ uint32_t rval = readl(&ccm->pll4_periph0_cfg);
+ int n = ((rval & CCM_PLL4_CTRL_N_MASK) >> CCM_PLL4_CTRL_N_SHIFT);
+ int p = ((rval & CCM_PLL4_CTRL_P_MASK) >> CCM_PLL4_CTRL_P_SHIFT);
+ int m = ((rval & CCM_PLL4_CTRL_M_MASK) >> CCM_PLL4_CTRL_M_SHIFT) + 1;
+ const int k = 1;
+
+ return ((24000000 * n * k) >> p) / m;
+}
OpenPOWER on IntegriCloud