omap: Make uncompress code and DEBUG_LL code generic

Define arch_decomp_setup() the same way as some other
architectures do. Use arch_id to configure the debug uart
based on the machine_is by storing it into the uart
scratchpad register for DEBUG_LL code to use.

Signed-off-by: Tony Lindgren <tony@atomide.com>

1 files changed, 95 insertions, 22 deletions

diff --git a/arch/arm/mach-omap2/include/mach/debug-macro.S b/arch/arm/mach-omap2/include/mach/debug-macro.S
index 8d6da9a..4a63a2e 100644
--- a/arch/arm/mach-omap2/include/mach/debug-macro.S
+++ b/arch/arm/mach-omap2/include/mach/debug-macro.S
@@ -15,32 +15,103 @@
 
 #include <plat/serial.h>
 
+#define UART_OFFSET(addr)	((addr) & 0x00ffffff)
+
+		.pushsection .data
+omap_uart_phys:	.word	0
+omap_uart_virt:	.word	0
+omap_uart_lsr:	.word	0
+		.popsection
+
+		/*
+		 * Note that this code won't work if the bootloader passes
+		 * a wrong machine ID number in r1. To debug, just hardcode
+		 * the desired UART phys and virt addresses temporarily into
+		 * the omap_uart_phys and omap_uart_virt above.
+		 */
 		.macro	addruart, rx, tmp
+
+		/* Use omap_uart_phys/virt if already configured */
+10:		mrc	p15, 0, \rx, c1, c0
+		tst	\rx, #1			@ MMU enabled?
+		ldreq	\rx, =omap_uart_phys	@ physical base address
+		ldrne	\rx, =omap_uart_virt	@ virtual base address
+		ldr	\rx, [\rx, #0]
+		cmp	\rx, #0			@ is port configured?
+		bne	99f			@ already configured
+
+		/* Check UART1 scratchpad register for uart to use */
 		mrc	p15, 0, \rx, c1, c0
 		tst	\rx, #1			@ MMU enabled?
-#ifdef  CONFIG_ARCH_OMAP2
 		moveq	\rx, #0x48000000	@ physical base address
 		movne	\rx, #0xfa000000	@ virtual base
-		orr	\rx, \rx, #0x0006a000
-#ifdef CONFIG_OMAP_LL_DEBUG_UART2
-		add	\rx, \rx, #0x00002000	@ UART 2
-#endif
-#ifdef CONFIG_OMAP_LL_DEBUG_UART3
-		add	\rx, \rx, #0x00004000	@ UART 3
-#endif
-
-#elif defined(CONFIG_ARCH_OMAP3) || defined(CONFIG_ARCH_OMAP4)
-		moveq	\rx, #0x48000000	@ physical base address
-		movne	\rx, #0xfa000000	@ virtual base
-		orr	\rx, \rx, #0x0006a000
-#ifdef CONFIG_OMAP_LL_DEBUG_UART2
-		add	\rx, \rx, #0x00002000	@ UART 2
-#endif
-#ifdef CONFIG_OMAP_LL_DEBUG_UART3
-		add	\rx, \rx, #0x00fb0000	@ UART 3
-		add	\rx, \rx, #0x00006000
-#endif
-#endif
+		orr	\rx, \rx, #0x0006a000	@ uart1 on omap2/3/4
+		ldrb	\rx, [\rx, #(UART_SCR << OMAP_PORT_SHIFT)] @ scratchpad
+
+		/* Select the UART to use based on the UART1 scratchpad value */
+		cmp	\rx, #0			@ no port configured?
+		beq	21f			@ if none, try to use UART1
+		cmp	\rx, #OMAP2UART1	@ OMAP2/3/4UART1
+		beq	21f			@ configure OMAP2/3/4UART1
+		cmp	\rx, #OMAP2UART2	@ OMAP2/3/4UART2
+		beq	22f			@ configure OMAP2/3/4UART2
+		cmp	\rx, #OMAP2UART3	@ only on 24xx
+		beq	23f			@ configure OMAP2UART3
+		cmp	\rx, #OMAP3UART3	@ only on 34xx
+		beq	33f			@ configure OMAP3UART3
+		cmp	\rx, #OMAP4UART3	@ only on 44xx
+		beq	43f			@ configure OMAP4UART3
+		cmp	\rx, #OMAP3UART4	@ only on 36xx
+		beq	34f			@ configure OMAP3UART4
+		cmp	\rx, #OMAP4UART4	@ only on 44xx
+		beq	44f			@ configure OMAP4UART4
+		cmp	\rx, #ZOOM_UART		@ only on zoom2/3
+		beq	95f			@ configure ZOOM_UART
+
+		/* Configure the UART offset from the phys/virt base */
+21:		mov	\rx, #UART_OFFSET(OMAP2_UART1_BASE)	@ omap2/3/4
+		b	98f
+22:		mov	\rx, #UART_OFFSET(OMAP2_UART2_BASE)	@ omap2/3/4
+		b	98f
+23:		mov	\rx, #UART_OFFSET(OMAP2_UART3_BASE)
+		b	98f
+33:		mov	\rx, #UART_OFFSET(OMAP3_UART1_BASE)
+		add	\rx, \rx, #0x00fb0000
+		add	\rx, \rx, #0x00006000		@ OMAP3_UART3_BASE
+		b	98f
+34:		mov	\rx, #UART_OFFSET(OMAP3_UART1_BASE)
+		add	\rx, \rx, #0x00fb0000
+		add	\rx, \rx, #0x00028000		@ OMAP3_UART4_BASE
+		b	98f
+43:		mov	\rx, #UART_OFFSET(OMAP4_UART3_BASE)
+		b	98f
+44:		mov	\rx, #UART_OFFSET(OMAP4_UART4_BASE)
+		b	98f
+95:		mov	\rx, #ZOOM_UART_BASE
+		ldr	\tmp, =omap_uart_phys
+		str	\rx, [\tmp, #0]
+		mov	\rx, #ZOOM_UART_VIRT
+		ldr	\tmp, =omap_uart_virt
+		str	\rx, [\tmp, #0]
+		mov	\rx, #(UART_LSR << ZOOM_PORT_SHIFT)
+		ldr	\tmp, =omap_uart_lsr
+		str	\rx, [\tmp, #0]
+		b	10b
+
+		/* Store both phys and virt address for the uart */
+98:		add	\rx, \rx, #0x48000000	@ phys base
+		ldr	\tmp, =omap_uart_phys
+		str	\rx, [\tmp, #0]
+		sub	\rx, \rx, #0x48000000	@ phys base
+		add	\rx, \rx, #0xfa000000	@ virt base
+		ldr	\tmp, =omap_uart_virt
+		str	\rx, [\tmp, #0]
+		mov	\rx, #(UART_LSR << OMAP_PORT_SHIFT)
+		ldr	\tmp, =omap_uart_lsr
+		str	\rx, [\tmp, #0]
+
+		b	10b
+99:
 		.endm
 
 		.macro	senduart,rd,rx
@@ -48,7 +119,9 @@
 		.endm
 
 		.macro	busyuart,rd,rx
-1001:		ldrb	\rd, [\rx, #(UART_LSR << OMAP_PORT_SHIFT)]
+1001:		ldr	\rd, =omap_uart_lsr
+		ldr	\rd, [\rd, #0]
+		ldrb	\rd, [\rx, \rd]
 		and	\rd, \rd, #(UART_LSR_TEMT | UART_LSR_THRE)
 		teq	\rd, #(UART_LSR_TEMT | UART_LSR_THRE)
 		bne	1001b