[U-Boot] [PATCH V2 09/11] imx: mx7: implement functions to boot auxiliary core

Peng Fan
2016-01-28T08:55:07Z

Implement arch_auxiliary_core_up and arch_auxiliary_core_check_up.

arch_auxiliary_core_check_up is used to check whether M4 is running
or not. arch_auxiliary_core_up is to boot M4 core, the m4 core will
use the pc and stack which is set in arch_auxiliary_core_up to set R15
and R13 register and boot.

Signed-off-by: Ye.Li <ye.li@nxp.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
---

V2:
no change

arch/arm/cpu/armv7/mx7/soc.c | 36 ++++++++++++++++++++++++++++++++
arch/arm/include/asm/arch-mx7/imx-regs.h | 5 +++++
2 files changed, 41 insertions(+)

diff --git a/arch/arm/cpu/armv7/mx7/soc.c b/arch/arm/cpu/armv7/mx7/soc.c
index 1d8e470..2121ff2 100644
--- a/arch/arm/cpu/armv7/mx7/soc.c
+++ b/arch/arm/cpu/armv7/mx7/soc.c
@@ -211,6 +211,42 @@ void imx_get_mac_from_fuse(int dev_id, unsigned char *mac)
}
#endif

+#ifdef CONFIG_IMX_BOOTAUX
+int arch_auxiliary_core_up(u32 core_id, u32 boot_private_data)
+{
+ u32 stack, pc;
+ struct src *src_reg = (struct src *)SRC_BASE_ADDR;
+
+ if (!boot_private_data)
+ return 1;
+
+ stack = *(u32 *)boot_private_data;
+ pc = *(u32 *)(boot_private_data + 4);
+
+ /* Set the stack and pc to M4 bootROM */
+ writel(stack, M4_BOOTROM_BASE_ADDR);
+ writel(pc, M4_BOOTROM_BASE_ADDR + 4);
+
+ /* Enable M4 */
+ clrsetbits_le32(&src_reg->m4rcr, SRC_M4RCR_M4C_NON_SCLR_RST_MASK,
+ SRC_M4RCR_ENABLE_M4_MASK);
+
+ return 0;
+}
+
+int arch_auxiliary_core_check_up(u32 core_id)
+{
+ uint32_t val;
+ struct src *src_reg = (struct src *)SRC_BASE_ADDR;
+
+ val = readl(&src_reg->m4rcr);
+ if (val & 0x00000001)
+ return 0; /* assert in reset */
+
+ return 1;
+}
+#endif
+
void set_wdog_reset(struct wdog_regs *wdog)
{
u32 reg = readw(&wdog->wcr);
diff --git a/arch/arm/include/asm/arch-mx7/imx-regs.h b/arch/arm/include/asm/arch-mx7/imx-regs.h
index 8e66d3d..5253b1e 100644
--- a/arch/arm/include/asm/arch-mx7/imx-regs.h
+++ b/arch/arm/include/asm/arch-mx7/imx-regs.h
@@ -260,6 +260,11 @@ struct src {
u32 ddrc_rcr;
};

+#define SRC_M4RCR_M4C_NON_SCLR_RST_OFFSET 0
+#define SRC_M4RCR_M4C_NON_SCLR_RST_MASK (1 << 0)
+#define SRC_M4RCR_ENABLE_M4_OFFSET 3
+#define SRC_M4RCR_ENABLE_M4_MASK (1 << 3)
+
/* GPR0 Bit Fields */
#define IOMUXC_GPR_GPR0_DMAREQ_MUX_SEL0_MASK 0x1u
#define IOMUXC_GPR_GPR0_DMAREQ_MUX_SEL0_SHIFT 0
--
2.6.2