ARM: debug: Use generic 8250 debug_ll for ti81xx

We want to use generic 8250 debug_ll code to get DEBUG_UNCOMPRESS
working and to simplify the code. The old debug_ll code is no longer
needed and the machine ID based detection is no longer used.

Note that for most part there's no need to keep DEBUG_LL enabled.
We now have CONFIG_SERIAL_EARLYCON working very early as long as
the kernel cmdline has "earlycon" in it and the board specific dts
file has chosen configured with with the port using stdout-path.

Cc: Hoeun Ryu <hoeun.ryu@gmail.com>
Cc: Russell King <linux@armlinux.org.uk>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/Kconfig.debug

@@ -712,17 +712,17 @@ choice
 	config DEBUG_TI81XXUART1
 		bool "Kernel low-level debugging messages via TI81XX UART1 (ti8148evm)"
 		depends on ARCH_OMAP2PLUS
-		select DEBUG_OMAP2PLUS_UART
+		select DEBUG_UART_8250
 
 	config DEBUG_TI81XXUART2
 		bool "Kernel low-level debugging messages via TI81XX UART2"
 		depends on ARCH_OMAP2PLUS
-		select DEBUG_OMAP2PLUS_UART
+		select DEBUG_UART_8250
 
 	config DEBUG_TI81XXUART3
 		bool "Kernel low-level debugging messages via TI81XX UART3 (ti8168evm)"
 		depends on ARCH_OMAP2PLUS
-		select DEBUG_OMAP2PLUS_UART
+		select DEBUG_UART_8250
 
 	config DEBUG_AM33XXUART1
 		bool "Kernel low-level debugging messages via AM33XX UART1"
@@ -1523,7 +1523,9 @@ config DEBUG_UART_PHYS
 	default 0x40090000 if DEBUG_LPC32XX
 	default 0x40100000 if DEBUG_PXA_UART1
 	default 0x42000000 if DEBUG_GEMINI
-	default 0x48020000 if DEBUG_OMAP4UART3
+	default 0x48020000 if DEBUG_OMAP4UART3 || DEBUG_TI81XXUART1
+	default 0x48022000 if DEBUG_TI81XXUART2
+	default 0x48024000 if DEBUG_TI81XXUART3
 	default 0x4806a000 if DEBUG_OMAP2UART1 || DEBUG_OMAP3UART1 || \
 				DEBUG_OMAP4UART1 || DEBUG_OMAP5UART1
 	default 0x4806c000 if DEBUG_OMAP2UART2 || DEBUG_OMAP3UART2 || \
@@ -1649,7 +1651,9 @@ config DEBUG_UART_VIRT
 	default 0xf8090000 if DEBUG_VEXPRESS_UART0_RS1
 	default 0xf8ffee00 if DEBUG_AT91_SAM9263_DBGU
 	default 0xf8fff200 if DEBUG_AT91_RM9200_DBGU
-	default 0xfa020000 if DEBUG_OMAP4UART3
+	default 0xfa020000 if DEBUG_OMAP4UART3 || DEBUG_TI81XXUART1
+	default 0xfa022000 if DEBUG_TI81XXUART2
+	default 0xfa024000 if DEBUG_TI81XXUART3
 	default 0xfa06a000 if DEBUG_OMAP2UART1 || DEBUG_OMAP3UART1 || \
 				DEBUG_OMAP4UART1 || DEBUG_OMAP5UART1
 	default 0xfa06c000 if DEBUG_OMAP2UART2 || DEBUG_OMAP3UART2 || \

arch/arm/include/debug/omap2plus.S

@@ -15,11 +15,6 @@
 /* OMAP3 serial ports */
 #define OMAP3_UART4_AM35XX_BASE	0x4809E000	/* Only on AM35xx */
 
-/* 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 */
 
@@ -56,18 +51,6 @@ omap_uart_lsr:	.word	0
 		bne	100f			@ already configured
 
 		/* Configure the UART offset from the phys/virt base */
-#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
@@ -94,17 +77,6 @@ omap_uart_lsr:	.word	0
 
 		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