This adds lowlevel debug functions for i.MX. As we have a great variety
of different UARTs on i.MX currently no Kconfig support for chosing the
correct one is added. Instead we expect the user to add the correct
define and issue a compiler warning if he hasn't.
Signed-off-by: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>
---
arch/arm/Kconfig | 1 +
arch/arm/mach-imx/include/mach/debug_ll.h | 46 +++++++++++++++++++++++++++++
2 files changed, 47 insertions(+)
create mode 100644 arch/arm/mach-imx/include/mach/debug_ll.h
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 3afd885..cdb5081 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -57,6 +57,7 @@ config ARCH_IMX
select COMMON_CLK
select CLKDEV_LOOKUP
select WATCHDOG_IMX_RESET_SOURCE
+ select HAS_DEBUG_LL
config ARCH_MXS
bool "Freescale i.MX23/28 (mxs) based"
diff --git a/arch/arm/mach-imx/include/mach/debug_ll.h b/arch/arm/mach-imx/include/mach/debug_ll.h
new file mode 100644
index 0000000..cb6dd03
--- /dev/null
+++ b/arch/arm/mach-imx/include/mach/debug_ll.h
@@ -0,0 +1,46 @@
+#ifndef __MACH_DEBUG_LL_H__
+#define __MACH_DEBUG_LL_H__
+
+#include <io.h>
+#include <config.h>
+#include <mach/imx1-regs.h>
+#include <mach/imx21-regs.h>
+#include <mach/imx25-regs.h>
+#include <mach/imx27-regs.h>
+#include <mach/imx31-regs.h>
+#include <mach/imx35-regs.h>
+#include <mach/imx51-regs.h>
+#include <mach/imx53-regs.h>
+#include <mach/imx6-regs.h>
+
+/* #define IMX_DEBUG_LL_UART_BASE MXxy_UARTx_BASE_ADDR */
+
+#ifndef IMX_DEBUG_LL_UART_BASE
+#warning define IMX_DEBUG_LL_UART_BASE properly for debug_ll
+#define IMX_DEBUG_LL_UART_BASE 0
+#endif
+
+#define URTX0 0x40 /* Transmitter Register */
+
+#define UCR1 0x80 /* Control Register 1 */
+#define UCR1_UARTEN (1 << 0) /* UART enabled */
+
+#define USR2 0x98 /* Status Register 2 */
+#define USR2_TXDC (1 << 3) /* Transmitter complete */
+
+static inline void PUTC_LL(int c)
+{
+ void __iomem *base = (void *)IMX_DEBUG_LL_UART_BASE;
+
+ if (!base)
+ return;
+
+ if (!(readl(base + UCR1) & UCR1_UARTEN))
+ return;
+
+ while (!(readl(base + USR2) & USR2_TXDC));
+
+ writel(c, base + URTX0);
+}
+
+#endif /* __MACH_DEBUG_LL_H__ */
--
1.7.10.4
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