diff options
Diffstat (limited to 'target/linux/brcm47xx/patches-3.10/080-MIPS-Add-8250-16550-serial-early-printk-driver.patch')
| -rw-r--r-- | target/linux/brcm47xx/patches-3.10/080-MIPS-Add-8250-16550-serial-early-printk-driver.patch | 124 |
1 files changed, 124 insertions, 0 deletions
diff --git a/target/linux/brcm47xx/patches-3.10/080-MIPS-Add-8250-16550-serial-early-printk-driver.patch b/target/linux/brcm47xx/patches-3.10/080-MIPS-Add-8250-16550-serial-early-printk-driver.patch new file mode 100644 index 0000000000..bfbe43be5b --- /dev/null +++ b/target/linux/brcm47xx/patches-3.10/080-MIPS-Add-8250-16550-serial-early-printk-driver.patch @@ -0,0 +1,124 @@ +commit 0a76092a63809a0e72e3e9552acadf42869c0293 +Author: Yoichi Yuasa <yuasa@linux-mips.org> +Date: Mon Feb 8 20:59:39 2010 +0900 + + MIPS: Add 8250/16550 serial early printk driver + + Signed-off-by: Yoichi Yuasa <yuasa@linux-mips.org> + Cc: linux-mips <linux-mips@linux-mips.org> + Patchwork: https://patchwork.linux-mips.org/patch/947/ + Signed-off-by: Ralf Baechle <ralf@linux-mips.org> + +--- a/arch/mips/Kconfig.debug ++++ b/arch/mips/Kconfig.debug +@@ -20,6 +20,14 @@ config EARLY_PRINTK + doesn't cooperate with an X server. You should normally say N here, + unless you want to debug such a crash. + ++config EARLY_PRINTK_8250 ++ bool "8250/16550 and compatible serial early printk driver" ++ depends on EARLY_PRINTK ++ default n ++ help ++ If you say Y here, it will be possible to use a 8250/16550 serial ++ port as the boot console. ++ + config CMDLINE_BOOL + bool "Built-in kernel command line" + default n +--- a/arch/mips/include/asm/setup.h ++++ b/arch/mips/include/asm/setup.h +@@ -5,6 +5,14 @@ + + extern void setup_early_printk(void); + ++#ifdef CONFIG_EARLY_PRINTK_8250 ++extern void setup_8250_early_printk_port(unsigned long base, ++ unsigned int reg_shift, unsigned int timeout); ++#else ++static inline void setup_8250_early_printk_port(unsigned long base, ++ unsigned int reg_shift, unsigned int timeout) {} ++#endif ++ + extern void set_handler(unsigned long offset, void *addr, unsigned long len); + extern void set_uncached_handler(unsigned long offset, void *addr, unsigned long len); + +--- a/arch/mips/kernel/Makefile ++++ b/arch/mips/kernel/Makefile +@@ -84,6 +84,7 @@ obj-$(CONFIG_GPIO_TXX9) += gpio_txx9.o + obj-$(CONFIG_KEXEC) += machine_kexec.o relocate_kernel.o crash.o + obj-$(CONFIG_CRASH_DUMP) += crash_dump.o + obj-$(CONFIG_EARLY_PRINTK) += early_printk.o ++obj-$(CONFIG_EARLY_PRINTK_8250) += early_printk_8250.o + obj-$(CONFIG_SPINLOCK_TEST) += spinlock_test.o + obj-$(CONFIG_MIPS_MACHINE) += mips_machine.o + +--- /dev/null ++++ b/arch/mips/kernel/early_printk_8250.c +@@ -0,0 +1,66 @@ ++/* ++ * 8250/16550-type serial ports prom_putchar() ++ * ++ * Copyright (C) 2010 Yoichi Yuasa <yuasa@linux-mips.org> ++ * ++ * 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; either version 2 of the License, or ++ * (at your option) any later version. ++ * ++ * This program is distributed in the hope that it will be useful, ++ * but WITHOUT ANY WARRANTY; without even the implied warranty of ++ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the ++ * GNU General Public License for more details. ++ * ++ * You should have received a copy of the GNU General Public License ++ * along with this program; if not, write to the Free Software ++ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA ++ */ ++#include <linux/io.h> ++#include <linux/serial_core.h> ++#include <linux/serial_reg.h> ++ ++static void __iomem *serial8250_base; ++static unsigned int serial8250_reg_shift; ++static unsigned int serial8250_tx_timeout; ++ ++void setup_8250_early_printk_port(unsigned long base, unsigned int reg_shift, ++ unsigned int timeout) ++{ ++ serial8250_base = (void __iomem *)base; ++ serial8250_reg_shift = reg_shift; ++ serial8250_tx_timeout = timeout; ++} ++ ++static inline u8 serial_in(int offset) ++{ ++ return readb(serial8250_base + (offset << serial8250_reg_shift)); ++} ++ ++static inline void serial_out(int offset, char value) ++{ ++ writeb(value, serial8250_base + (offset << serial8250_reg_shift)); ++} ++ ++void prom_putchar(char c) ++{ ++ unsigned int timeout; ++ int status, bits; ++ ++ if (!serial8250_base) ++ return; ++ ++ timeout = serial8250_tx_timeout; ++ bits = UART_LSR_TEMT | UART_LSR_THRE; ++ ++ do { ++ status = serial_in(UART_LSR); ++ ++ if (--timeout == 0) ++ break; ++ } while ((status & bits) != bits); ++ ++ if (timeout) ++ serial_out(UART_TX, c); ++} |