[PATCH 5/8] ARM: OMAP2+: Add multiplatform debug_ll support
Tony Lindgren
tony at atomide.com
Wed Dec 19 14:26:25 EST 2012
Add multiplatform debug_ll support by stripping away
the custom hacks to detect the port from debug-macro.S.
Note that this now requires the specific debug_ll port to
be selected in the .config.
The old debug-macro.S will be removed a bit later
once we are sure things work properly with multiplatform
enabled.
Signed-off-by: Tony Lindgren <tony at atomide.com>
---
arch/arm/Kconfig.debug | 56 +++++++++++
arch/arm/include/debug/omap2plus.S | 190 ++++++++++++++++++++++++++++++++++++
2 files changed, 246 insertions(+)
create mode 100644 arch/arm/include/debug/omap2plus.S
diff --git a/arch/arm/Kconfig.debug b/arch/arm/Kconfig.debug
index 661030d..8cccce3 100644
--- a/arch/arm/Kconfig.debug
+++ b/arch/arm/Kconfig.debug
@@ -291,6 +291,13 @@ choice
Say Y here if you want kernel low-level debugging support
on MVEBU based platforms.
+ config DEBUG_OMAP2PLUS_UART
+ bool "Kernel low-level debugging messages via OMAP2PLUS UART"
+ depends on ARCH_OMAP2PLUS
+ help
+ Say Y here if you want kernel low-level debugging support
+ on OMAP2PLUS based platforms.
+
config DEBUG_PICOXCELL_UART
depends on ARCH_PICOXCELL
bool "Use PicoXcell UART for low-level debug"
@@ -461,6 +468,54 @@ config DEBUG_IMX6Q_UART_PORT
choice
prompt "Low-level debug console UART"
+ depends on DEBUG_OMAP2PLUS_UART
+
+ config DEBUG_OMAP2UART1
+ bool "OMAP2/3/4 UART1 (omap2/3 sdp boards and some omap3 boards)"
+ help
+ This covers at least h4, 2430sdp, 3430sdp, 3630sdp,
+ omap3 torpedo and 3530 lv som.
+
+ config DEBUG_OMAP2UART2
+ bool "OMAP2/3/4 UART2"
+
+ config DEBUG_OMAP2UART3
+ bool "OMAP2 UART3 (n8x0)"
+
+ config DEBUG_OMAP3UART3
+ bool "OMAP3 UART3 (most omap3 boards)"
+ help
+ This covers at least cm_t3x, beagle, crane, devkit8000,
+ igep00x0, ldp, n900, n9(50), pandora, overo, touchbook,
+ and 3517evm.
+
+ config DEBUG_OMAP4UART3
+ bool "OMAP4/5 UART3 (omap4 blaze, panda, omap5 sevm)"
+
+ config DEBUG_OMAP3UART4
+ bool "OMAP36XX UART4"
+
+ config DEBUG_OMAP4UART4
+ bool "OMAP4/5 UART4"
+
+ config DEBUG_TI81XXUART1
+ bool "TI81XX UART1 (ti8148evm)"
+
+ config DEBUG_TI81XXUART2
+ bool "TI81XX UART2"
+
+ config DEBUG_TI81XXUART3
+ bool "TI81XX UART3 (ti8168evm)"
+
+ config DEBUG_AM33XXUART1
+ bool "AM33XX UART1"
+
+ config DEBUG_ZOOM_UART
+ bool "Zoom2/3 UART"
+endchoice
+
+choice
+ prompt "Low-level debug console UART"
depends on DEBUG_LL && DEBUG_TEGRA_UART
config TEGRA_DEBUG_UART_AUTO_ODMDATA
@@ -501,6 +556,7 @@ config DEBUG_LL_INCLUDE
DEBUG_IMX6Q_UART
default "debug/highbank.S" if DEBUG_HIGHBANK_UART
default "debug/mvebu.S" if DEBUG_MVEBU_UART
+ default "debug/omap2plus.S" if DEBUG_OMAP2PLUS_UART
default "debug/picoxcell.S" if DEBUG_PICOXCELL_UART
default "debug/socfpga.S" if DEBUG_SOCFPGA_UART
default "debug/sunxi.S" if DEBUG_SUNXI_UART0 || DEBUG_SUNXI_UART1
diff --git a/arch/arm/include/debug/omap2plus.S b/arch/arm/include/debug/omap2plus.S
new file mode 100644
index 0000000..6d867ae
--- /dev/null
+++ b/arch/arm/include/debug/omap2plus.S
@@ -0,0 +1,190 @@
+/*
+ * Debugging macro include header
+ *
+ * Copyright (C) 1994-1999 Russell King
+ * Moved from linux/arch/arm/kernel/debug.S by Ben Dooks
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+*/
+
+#include <linux/serial_reg.h>
+
+/* OMAP2 serial ports */
+#define OMAP2_UART1_BASE 0x4806a000
+#define OMAP2_UART2_BASE 0x4806c000
+#define OMAP2_UART3_BASE 0x4806e000
+
+/* OMAP3 serial ports */
+#define OMAP3_UART1_BASE OMAP2_UART1_BASE
+#define OMAP3_UART2_BASE OMAP2_UART2_BASE
+#define OMAP3_UART3_BASE 0x49020000
+#define OMAP3_UART4_BASE 0x49042000 /* Only on 36xx */
+#define OMAP3_UART4_AM35XX_BASE 0x4809E000 /* Only on AM35xx */
+
+/* OMAP4 serial ports */
+#define OMAP4_UART1_BASE OMAP2_UART1_BASE
+#define OMAP4_UART2_BASE OMAP2_UART2_BASE
+#define OMAP4_UART3_BASE 0x48020000
+#define OMAP4_UART4_BASE 0x4806e000
+
+/* TI81XX serial ports */
+#define TI81XX_UART1_BASE 0x48020000
+#define TI81XX_UART2_BASE 0x48022000
+#define TI81XX_UART3_BASE 0x48024000
+
+/* AM3505/3517 UART4 */
+#define AM35XX_UART4_BASE 0x4809E000 /* Only on AM3505/3517 */
+
+/* AM33XX serial port */
+#define AM33XX_UART1_BASE 0x44E09000
+
+/* OMAP5 serial ports */
+#define OMAP5_UART1_BASE OMAP2_UART1_BASE
+#define OMAP5_UART2_BASE OMAP2_UART2_BASE
+#define OMAP5_UART3_BASE OMAP4_UART3_BASE
+#define OMAP5_UART4_BASE OMAP4_UART4_BASE
+#define OMAP5_UART5_BASE 0x48066000
+#define OMAP5_UART6_BASE 0x48068000
+
+/* External port on Zoom2/3 */
+#define ZOOM_UART_BASE 0x10000000
+#define ZOOM_UART_VIRT 0xfa400000
+
+#define OMAP_PORT_SHIFT 2
+#define ZOOM_PORT_SHIFT 1
+
+#define UART_OFFSET(addr) ((addr) & 0x00ffffff)
+
+ .pushsection .data
+omap_uart_phys: .word 0
+omap_uart_virt: .word 0
+omap_uart_lsr: .word 0
+ .popsection
+
+ .macro addruart, rp, rv, tmp
+
+ /* Use omap_uart_phys/virt if already configured */
+10: adr \rp, 99f @ get effective addr of 99f
+ ldr \rv, [\rp] @ get absolute addr of 99f
+ sub \rv, \rv, \rp @ offset between the two
+ ldr \rp, [\rp, #4] @ abs addr of omap_uart_phys
+ sub \tmp, \rp, \rv @ make it effective
+ ldr \rp, [\tmp, #0] @ omap_uart_phys
+ ldr \rv, [\tmp, #4] @ omap_uart_virt
+ cmp \rp, #0 @ is port configured?
+ cmpne \rv, #0
+ bne 100f @ already configured
+
+ /* Configure the UART offset from the phys/virt base */
+#ifdef CONFIG_DEBUG_OMAP2UART1
+ mov \rp, #UART_OFFSET(OMAP2_UART1_BASE) @ omap2/3/4
+ b 98f
+#endif
+#ifdef CONFIG_DEBUG_OMAP2UART2
+ mov \rp, #UART_OFFSET(OMAP2_UART2_BASE) @ omap2/3/4
+ b 98f
+#endif
+#ifdef CONFIG_DEBUG_OMAP2UART3
+ mov \rp, #UART_OFFSET(OMAP2_UART3_BASE)
+ b 98f
+#endif
+#ifdef CONFIG_DEBUG_OMAP3UART3
+ mov \rp, #UART_OFFSET(OMAP3_UART1_BASE)
+ add \rp, \rp, #0x00fb0000
+ add \rp, \rp, #0x00006000 @ OMAP3_UART3_BASE
+ b 98f
+#endif
+#ifdef CONFIG_DEBUG_OMAP4UART3
+ mov \rp, #UART_OFFSET(OMAP4_UART3_BASE)
+ b 98f
+#endif
+#ifdef CONFIG_DEBUG_OMAP3UART4
+ mov \rp, #UART_OFFSET(OMAP3_UART1_BASE)
+ add \rp, \rp, #0x00fb0000
+ add \rp, \rp, #0x00028000 @ OMAP3_UART4_BASE
+ b 98f
+#endif
+#ifdef CONFIG_DEBUG_OMAP4UART4
+ mov \rp, #UART_OFFSET(OMAP4_UART4_BASE)
+ b 98f
+#endif
+#ifdef CONFIG_DEBUG_TI81XXUART1
+ mov \rp, #UART_OFFSET(TI81XX_UART1_BASE)
+ b 98f
+#endif
+#ifdef CONFIG_DEBUG_TI81XXUART2
+ mov \rp, #UART_OFFSET(TI81XX_UART2_BASE)
+ b 98f
+#endif
+#ifdef CONFIG_DEBUG_TI81XXUART3
+ mov \rp, #UART_OFFSET(TI81XX_UART3_BASE)
+ b 98f
+#endif
+#ifdef CONFIG_DEBUG_AM33XXUART1
+ ldr \rp, =AM33XX_UART1_BASE
+ and \rp, \rp, #0x00ffffff
+ b 97f
+#endif
+#ifdef CONFIG_DEBUG_ZOOM_UART
+ ldr \rp, =ZOOM_UART_BASE
+ str \rp, [\tmp, #0] @ omap_uart_phys
+ ldr \rp, =ZOOM_UART_VIRT
+ str \rp, [\tmp, #4] @ omap_uart_virt
+ mov \rp, #(UART_LSR << ZOOM_PORT_SHIFT)
+ str \rp, [\tmp, #8] @ omap_uart_lsr
+#endif
+ b 10b
+
+ /* AM33XX: Store both phys and virt address for the uart */
+97: add \rp, \rp, #0x44000000 @ phys base
+ str \rp, [\tmp, #0] @ omap_uart_phys
+ sub \rp, \rp, #0x44000000 @ phys base
+ add \rp, \rp, #0xf9000000 @ virt base
+ str \rp, [\tmp, #4] @ omap_uart_virt
+ mov \rp, #(UART_LSR << OMAP_PORT_SHIFT)
+ str \rp, [\tmp, #8] @ omap_uart_lsr
+
+ b 10b
+
+ /* Store both phys and virt address for the uart */
+98: add \rp, \rp, #0x48000000 @ phys base
+ str \rp, [\tmp, #0] @ omap_uart_phys
+ sub \rp, \rp, #0x48000000 @ phys base
+ add \rp, \rp, #0xfa000000 @ virt base
+ str \rp, [\tmp, #4] @ omap_uart_virt
+ mov \rp, #(UART_LSR << OMAP_PORT_SHIFT)
+ str \rp, [\tmp, #8] @ omap_uart_lsr
+
+ b 10b
+
+ .align
+99: .word .
+ .word omap_uart_phys
+ .ltorg
+
+100: /* Pass the UART_LSR reg address */
+ ldr \tmp, [\tmp, #8] @ omap_uart_lsr
+ add \rp, \rp, \tmp
+ add \rv, \rv, \tmp
+ .endm
+
+ .macro senduart,rd,rx
+ orr \rd, \rd, \rx, lsl #24 @ preserve LSR reg offset
+ bic \rx, \rx, #0xff @ get base (THR) reg address
+ strb \rd, [\rx] @ send lower byte of rd
+ orr \rx, \rx, \rd, lsr #24 @ restore original rx (LSR)
+ bic \rd, \rd, #(0xff << 24) @ restore original rd
+ .endm
+
+ .macro busyuart,rd,rx
+1001: ldrb \rd, [\rx] @ rx contains UART_LSR address
+ and \rd, \rd, #(UART_LSR_TEMT | UART_LSR_THRE)
+ teq \rd, #(UART_LSR_TEMT | UART_LSR_THRE)
+ bne 1001b
+ .endm
+
+ .macro waituart,rd,rx
+ .endm
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