config DEBUG_BRCMSTB_UART
bool "Use BRCMSTB UART for low-level debug"
depends on ARCH_BRCMSTB
- select DEBUG_UART_8250
help
Say Y here if you want the debug print routines to direct
- their output to the first serial port on these devices.
+ their output to the first serial port on these devices. The
+ UART physical and virtual address is automatically provided
+ based on the chip identification register value.
If you have a Broadcom STB chip and would like early print
messages to appear over the UART, select this option.
default "debug/zynq.S" if DEBUG_ZYNQ_UART0 || DEBUG_ZYNQ_UART1
default "debug/bcm63xx.S" if DEBUG_BCM63XX_UART
default "debug/digicolor.S" if DEBUG_DIGICOLOR_UA0
+ default "debug/brcmstb.S" if DEBUG_BRCMSTB_UART
default "mach/debug-macro.S"
# Compatibility options for PL01x
default 0xe6e60000 if DEBUG_RCAR_GEN2_SCIF0
default 0xe8008000 if DEBUG_R7S72100_SCIF2
default 0xf0000be0 if ARCH_EBSA110
- default 0xf040ab00 if DEBUG_BRCMSTB_UART
default 0xf1012000 if DEBUG_MVEBU_UART0_ALTERNATE
default 0xf1012100 if DEBUG_MVEBU_UART1_ALTERNATE
default 0xf7fc9000 if DEBUG_BERLIN_UART
default 0xfb009000 if DEBUG_REALVIEW_STD_PORT
default 0xfb00c000 if DEBUG_AT91_SAMA5D4_USART3
default 0xfb10c000 if DEBUG_REALVIEW_PB1176_PORT
- default 0xfc40ab00 if DEBUG_BRCMSTB_UART
default 0xfc705000 if DEBUG_ZTE_ZX
default 0xfcfe8600 if DEBUG_BCM63XX_UART
default 0xfd000000 if DEBUG_SPEAR3XX || DEBUG_SPEAR13XX
DEBUG_ALPINE_UART0 || \
DEBUG_DAVINCI_DMx_UART0 || DEBUG_DAVINCI_DA8XX_UART1 || \
DEBUG_DAVINCI_DA8XX_UART2 || \
- DEBUG_BCM_KONA_UART || DEBUG_RK32_UART2 || \
- DEBUG_BRCMSTB_UART
+ DEBUG_BCM_KONA_UART || DEBUG_RK32_UART2
config DEBUG_UART_8250_PALMCHIP
bool "8250 UART is Palmchip BK-310x"
bool
depends on ARCH_MULTIPLATFORM || PLAT_SAMSUNG || ARM_SINGLE_ARMV7M
default y if DEBUG_LL && !DEBUG_OMAP2PLUS_UART && \
- (!DEBUG_TEGRA_UART || !ZBOOT_ROM)
+ (!DEBUG_TEGRA_UART || !ZBOOT_ROM) && \
+ !DEBUG_BRCMSTB_UART
help
This option influences the normal decompressor output for
multiplatform kernels. Normally, multiplatform kernels disable
--- /dev/null
+/*
+ * Copyright (C) 2016 Broadcom
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+#include <linux/serial_reg.h>
+
+/* Physical register offset and virtual register offset */
+#define REG_PHYS_BASE 0xf0000000
+#define REG_VIRT_BASE 0xfc000000
+#define REG_PHYS_ADDR(x) ((x) + REG_PHYS_BASE)
+
+/* Product id can be read from here */
+#define SUN_TOP_CTRL_BASE REG_PHYS_ADDR(0x404000)
+
+#define UARTA_3390 REG_PHYS_ADDR(0x40a900)
+#define UARTA_7250 REG_PHYS_ADDR(0x40b400)
+#define UARTA_7268 REG_PHYS_ADDR(0x40c000)
+#define UARTA_7271 UARTA_7268
+#define UARTA_7364 REG_PHYS_ADDR(0x40b000)
+#define UARTA_7366 UARTA_7364
+#define UARTA_74371 REG_PHYS_ADDR(0x406b00)
+#define UARTA_7439 REG_PHYS_ADDR(0x40a900)
+#define UARTA_7445 REG_PHYS_ADDR(0x40ab00)
+
+#define UART_SHIFT 2
+
+#define checkuart(rp, rv, family_id, family) \
+ /* Load family id */ \
+ ldr rp, =family_id ; \
+ /* Compare SUN_TOP_CTRL value against it */ \
+ cmp rp, rv ; \
+ /* Passed test, load address */ \
+ ldreq rp, =UARTA_##family ; \
+ /* Jump to save UART address */ \
+ beq 91f
+
+ .macro addruart, rp, rv, tmp
+ adr \rp, 99f @ actual addr of 99f
+ ldr \rv, [\rp] @ linked addr is stored there
+ sub \rv, \rv, \rp @ offset between the two
+ ldr \rp, [\rp, #4] @ linked brcmstb_uart_config
+ sub \tmp, \rp, \rv @ actual brcmstb_uart_config
+ ldr \rp, [\tmp] @ Load brcmstb_uart_config
+ cmp \rp, #1 @ needs initialization?
+ bne 100f @ no; go load the addresses
+ mov \rv, #0 @ yes; record init is done
+ str \rv, [\tmp]
+
+ /* Check SUN_TOP_CTRL base */
+ ldr \rp, =SUN_TOP_CTRL_BASE @ load SUN_TOP_CTRL PA
+ ldr \rv, [\rp, #0] @ get register contents
+ and \rv, \rv, #0xffffff00 @ strip revision bits [7:0]
+
+ /* Chip specific detection starts here */
+20: checkuart(\rp, \rv, 0x33900000, 3390)
+21: checkuart(\rp, \rv, 0x72500000, 7250)
+22: checkuart(\rp, \rv, 0x72680000, 7268)
+23: checkuart(\rp, \rv, 0x72710000, 7271)
+24: checkuart(\rp, \rv, 0x73640000, 7364)
+25: checkuart(\rp, \rv, 0x73660000, 7366)
+26: checkuart(\rp, \rv, 0x07437100, 74371)
+27: checkuart(\rp, \rv, 0x74390000, 7439)
+28: checkuart(\rp, \rv, 0x74450000, 7445)
+
+ /* No valid UART found */
+90: mov \rp, #0
+ /* fall through */
+
+ /* Record whichever UART we chose */
+91: str \rp, [\tmp, #4] @ Store in brcmstb_uart_phys
+ cmp \rp, #0 @ Valid UART address?
+ bne 92f @ Yes, go process it
+ str \rp, [\tmp, #8] @ Store 0 in brcmstb_uart_virt
+ b 100f @ Done
+92: and \rv, \rp, #0xffffff @ offset within 16MB section
+ add \rv, \rv, #REG_VIRT_BASE
+ str \rv, [\tmp, #8] @ Store in brcmstb_uart_virt
+ b 100f
+
+ .align
+99: .word .
+ .word brcmstb_uart_config
+ .ltorg
+
+ /* Load previously selected UART address */
+100: ldr \rp, [\tmp, #4] @ Load brcmstb_uart_phys
+ ldr \rv, [\tmp, #8] @ Load brcmstb_uart_virt
+ .endm
+
+ .macro store, rd, rx:vararg
+ str \rd, \rx
+ .endm
+
+ .macro load, rd, rx:vararg
+ ldr \rd, \rx
+ .endm
+
+ .macro senduart,rd,rx
+ store \rd, [\rx, #UART_TX << UART_SHIFT]
+ .endm
+
+ .macro busyuart,rd,rx
+1002: load \rd, [\rx, #UART_LSR << UART_SHIFT]
+ and \rd, \rd, #UART_LSR_TEMT | UART_LSR_THRE
+ teq \rd, #UART_LSR_TEMT | UART_LSR_THRE
+ bne 1002b
+ .endm
+
+ .macro waituart,rd,rx
+ .endm
+
+/*
+ * Storage for the state maintained by the macros above.
+ *
+ * In the kernel proper, this data is located in arch/arm/mach-bcm/brcmstb.c.
+ * That's because this header is included from multiple files, and we only
+ * want a single copy of the data. In particular, the UART probing code above
+ * assumes it's running using physical addresses. This is true when this file
+ * is included from head.o, but not when included from debug.o. So we need
+ * to share the probe results between the two copies, rather than having
+ * to re-run the probing again later.
+ *
+ * In the decompressor, we put the symbol/storage right here, since common.c
+ * isn't included in the decompressor build. This symbol gets put in .text
+ * even though it's really data, since .data is discarded from the
+ * decompressor. Luckily, .text is writeable in the decompressor, unless
+ * CONFIG_ZBOOT_ROM. That dependency is handled in arch/arm/Kconfig.debug.
+ */
+#if defined(ZIMAGE)
+brcmstb_uart_config:
+ /* Debug UART initialization required */
+ .word 1
+ /* Debug UART physical address */
+ .word 0
+ /* Debug UART virtual address */
+ .word 0
+#endif
projects / platform / kernel / linux-rpi.git / commitdiff