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omap: Use a memory address for storing the debug port info instead of UART1 scratchpad

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This removes the dependency to the UART1 being available for storing
the debug configuration in uncompress.h. This will simplify the
DEBUG_LL UART configuration for boards that may not have UART1, or
have an external UART as it requires only one mapping for DEBUG_LL.

The patch has a few limitations. Basically now we're assuming that
the kernel uncompress code won't overlap with OMAP_UART_INFO. We also
assume the printascii is called at least once before paging_init in
order for addruart to have a chance to read the UART setup from
OMAP_UART_INFO.

As suggested by Cyril Chemparathy <cyril@ti.com>,
Vikram Pandita <vikram.pandita@ti.com> and
Kevin Hilman <khilman@deeprootsystems.com>. Based on an earlier
patch posted for Davinci by Cyril Chemparathy <cyril@ti.com>.

Signed-off-by: Tony Lindgren <tony@atomide.com>
This commit is contained in:
Tony Lindgren 2010-04-30 17:39:19 -07:00
parent daa494958a
commit 96554d7077
4 changed files with 43 additions and 47 deletions
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21
arch/arm/mach-omap1/include/mach/debug-macro.S
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@ -13,6 +13,8 @@
#include <linux/serial_reg.h> #include <linux/serial_reg.h>
#include <asm/memory.h>
#include <plat/serial.h> #include <plat/serial.h>
.pushsection .data .pushsection .data
@ -37,23 +39,12 @@ omap_uart_virt: .word 0x0
cmp \rx, #0 @ is port configured? cmp \rx, #0 @ is port configured?
bne 99f @ already configured bne 99f @ already configured
/* Check 7XX UART1 scratchpad register for uart to use */ /* Check the debug UART configuration set in uncompress.h */
mrc p15, 0, \rx, c1, c0 mrc p15, 0, \rx, c1, c0
tst \rx, #1 @ MMU enabled? tst \rx, #1 @ MMU enabled?
moveq \rx, #0xff000000 @ physical base address ldreq \rx, =OMAP_UART_INFO
movne \rx, #0xfe000000 @ virtual base ldrne \rx, =__phys_to_virt(OMAP_UART_INFO)
orr \rx, \rx, #0x00fb0000 @ OMAP1UART1 ldr \rx, [\rx, #0]
ldrb \rx, [\rx, #(UART_SCR << OMAP7XX_PORT_SHIFT)]
cmp \rx, #0 @ anything in 7XX scratchpad?
bne 10f @ found 7XX uart
/* Check 15xx/16xx UART1 scratchpad register for uart to use */
mrc p15, 0, \rx, c1, c0
tst \rx, #1 @ MMU enabled?
moveq \rx, #0xff000000 @ physical base address
movne \rx, #0xfe000000 @ virtual base
orr \rx, \rx, #0x00fb0000 @ OMAP1UART1
ldrb \rx, [\rx, #(UART_SCR << OMAP_PORT_SHIFT)]
/* Select the UART to use based on the UART1 scratchpad value */ /* Select the UART to use based on the UART1 scratchpad value */
10: cmp \rx, #0 @ no port configured? 10: cmp \rx, #0 @ no port configured?

11
arch/arm/mach-omap2/include/mach/debug-macro.S
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@ -13,6 +13,8 @@
#include <linux/serial_reg.h> #include <linux/serial_reg.h>
#include <asm/memory.h>
#include <plat/serial.h> #include <plat/serial.h>
#define UART_OFFSET(addr) ((addr) & 0x00ffffff) #define UART_OFFSET(addr) ((addr) & 0x00ffffff)
@ -40,13 +42,12 @@ omap_uart_lsr: .word 0
cmp \rx, #0 @ is port configured? cmp \rx, #0 @ is port configured?
bne 99f @ already configured bne 99f @ already configured
/* Check UART1 scratchpad register for uart to use */ /* Check the debug UART configuration set in uncompress.h */
mrc p15, 0, \rx, c1, c0 mrc p15, 0, \rx, c1, c0
tst \rx, #1 @ MMU enabled? tst \rx, #1 @ MMU enabled?
moveq \rx, #0x48000000 @ physical base address ldreq \rx, =OMAP_UART_INFO
movne \rx, #0xfa000000 @ virtual base ldrne \rx, =__phys_to_virt(OMAP_UART_INFO)
orr \rx, \rx, #0x0006a000 @ uart1 on omap2/3/4 ldr \rx, [\rx, #0]
ldrb \rx, [\rx, #(UART_SCR << OMAP_PORT_SHIFT)] @ scratchpad
/* Select the UART to use based on the UART1 scratchpad value */ /* Select the UART to use based on the UART1 scratchpad value */
cmp \rx, #0 @ no port configured? cmp \rx, #0 @ no port configured?

14
arch/arm/plat-omap/include/plat/serial.h
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@ -15,6 +15,20 @@
#include <linux/init.h> #include <linux/init.h>
/*
* Memory entry used for the DEBUG_LL UART configuration. See also
* uncompress.h and debug-macro.S.
*
* Note that using a memory location for storing the UART configuration
* has at least two limitations:
*
* 1. Kernel uncompress code cannot overlap OMAP_UART_INFO as the
* uncompress code could then partially overwrite itself
* 2. We assume printascii is called at least once before paging_init,
* and addruart has a chance to read OMAP_UART_INFO
*/
#define OMAP_UART_INFO (PHYS_OFFSET + 0x3ffc)
/* OMAP1 serial ports */ /* OMAP1 serial ports */
#define OMAP1_UART1_BASE 0xfffb0000 #define OMAP1_UART1_BASE 0xfffb0000
#define OMAP1_UART2_BASE 0xfffb0800 #define OMAP1_UART2_BASE 0xfffb0800

44
arch/arm/plat-omap/include/plat/uncompress.h
View File

@ -20,27 +20,21 @@
#include <linux/types.h> #include <linux/types.h>
#include <linux/serial_reg.h> #include <linux/serial_reg.h>
#include <asm/memory.h>
#include <asm/mach-types.h> #include <asm/mach-types.h>
#include <plat/serial.h> #include <plat/serial.h>
static volatile u8 *uart1_base;
static int uart1_shift;
static volatile u8 *uart_base; static volatile u8 *uart_base;
static int uart_shift; static int uart_shift;
/* /*
* Store the DEBUG_LL uart number into UART1 scratchpad register. * Store the DEBUG_LL uart number into memory.
* See also debug-macro.S, and serial.c for related code. * See also debug-macro.S, and serial.c for related code.
*
* Please note that we currently assume that:
* - UART1 clocks are enabled for register access
* - UART1 scratchpad register can be used
*/ */
static void set_uart1_scratchpad(unsigned char port) static void set_omap_uart_info(unsigned char port)
{ {
uart1_base[UART_SCR << uart1_shift] = port; *(volatile u32 *)OMAP_UART_INFO = port;
} }
static void putc(int c) static void putc(int c)
@ -60,42 +54,38 @@ static inline void flush(void)
/* /*
* Macros to configure UART1 and debug UART * Macros to configure UART1 and debug UART
*/ */
#define _DEBUG_LL_ENTRY(mach, uart1_phys, uart1_shft, \ #define _DEBUG_LL_ENTRY(mach, dbg_uart, dbg_shft, dbg_id) \
dbg_uart, dbg_shft, dbg_id) \
if (machine_is_##mach()) { \ if (machine_is_##mach()) { \
uart1_base = (volatile u8 *)(uart1_phys); \
uart1_shift = (uart1_shft); \
uart_base = (volatile u8 *)(dbg_uart); \ uart_base = (volatile u8 *)(dbg_uart); \
uart_shift = (dbg_shft); \ uart_shift = (dbg_shft); \
port = (dbg_id); \ port = (dbg_id); \
set_uart1_scratchpad(port); \ set_omap_uart_info(port); \
break; \ break; \
} }
#define DEBUG_LL_OMAP7XX(p, mach) \ #define DEBUG_LL_OMAP7XX(p, mach) \
_DEBUG_LL_ENTRY(mach, OMAP1_UART1_BASE, OMAP7XX_PORT_SHIFT, \ _DEBUG_LL_ENTRY(mach, OMAP1_UART##p##_BASE, OMAP7XX_PORT_SHIFT, \
OMAP1_UART##p##_BASE, OMAP7XX_PORT_SHIFT, OMAP1UART##p) OMAP1UART##p)
#define DEBUG_LL_OMAP1(p, mach) \ #define DEBUG_LL_OMAP1(p, mach) \
_DEBUG_LL_ENTRY(mach, OMAP1_UART1_BASE, OMAP_PORT_SHIFT, \ _DEBUG_LL_ENTRY(mach, OMAP1_UART##p##_BASE, OMAP_PORT_SHIFT, \
OMAP1_UART##p##_BASE, OMAP_PORT_SHIFT, OMAP1UART##p) OMAP1UART##p)
#define DEBUG_LL_OMAP2(p, mach) \ #define DEBUG_LL_OMAP2(p, mach) \
_DEBUG_LL_ENTRY(mach, OMAP2_UART1_BASE, OMAP_PORT_SHIFT, \ _DEBUG_LL_ENTRY(mach, OMAP2_UART##p##_BASE, OMAP_PORT_SHIFT, \
OMAP2_UART##p##_BASE, OMAP_PORT_SHIFT, OMAP2UART##p) OMAP2UART##p)
#define DEBUG_LL_OMAP3(p, mach) \ #define DEBUG_LL_OMAP3(p, mach) \
_DEBUG_LL_ENTRY(mach, OMAP3_UART1_BASE, OMAP_PORT_SHIFT, \ _DEBUG_LL_ENTRY(mach, OMAP3_UART##p##_BASE, OMAP_PORT_SHIFT, \
OMAP3_UART##p##_BASE, OMAP_PORT_SHIFT, OMAP3UART##p) OMAP3UART##p)
#define DEBUG_LL_OMAP4(p, mach) \ #define DEBUG_LL_OMAP4(p, mach) \
_DEBUG_LL_ENTRY(mach, OMAP4_UART1_BASE, OMAP_PORT_SHIFT, \ _DEBUG_LL_ENTRY(mach, OMAP4_UART##p##_BASE, OMAP_PORT_SHIFT, \
OMAP4_UART##p##_BASE, OMAP_PORT_SHIFT, OMAP4UART##p) OMAP4UART##p)
/* Zoom2/3 shift is different for UART1 and external port */ /* Zoom2/3 shift is different for UART1 and external port */
#define DEBUG_LL_ZOOM(mach) \ #define DEBUG_LL_ZOOM(mach) \
_DEBUG_LL_ENTRY(mach, OMAP2_UART1_BASE, OMAP_PORT_SHIFT, \ _DEBUG_LL_ENTRY(mach, ZOOM_UART_BASE, ZOOM_PORT_SHIFT, ZOOM_UART)
ZOOM_UART_BASE, ZOOM_PORT_SHIFT, ZOOM_UART)
static inline void __arch_decomp_setup(unsigned long arch_id) static inline void __arch_decomp_setup(unsigned long arch_id)
{ {