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authorOlof Johansson <olof@lixom.net>2014-03-11 13:28:32 -0700
committerOlof Johansson <olof@lixom.net>2014-03-11 13:28:32 -0700
commit0daba17de771388a004148a357f7c63d648b0b3b (patch)
treed810487f9b1b37b2c7b456be96fbb1cdfdca8254 /arch/arm/mach-bcm
parent50776b6cf85d4b2bf3c4f209c4e01f354d0daa2c (diff)
parentd30fe6272183f3cc8b9f3f111cd36271332e4cec (diff)
Merge tag 'bcm2835-for-3.15-soc' of git://git.kernel.org/pub/scm/linux/kernel/git/swarren/linux-rpi into next/cleanup
Merge "ARM: bcm2835: consolidate into mach-bcm/" from Stephen Warren: This pull request consists of a single patch which moves files from arch/arm/mach-bcm2835 into mach-bcm, thus consolidating them with support for other Broadcom chips. * tag 'bcm2835-for-3.15-soc' of git://git.kernel.org/pub/scm/linux/kernel/git/swarren/linux-rpi: ARM: bcm2835: Move to mach-bcm directory Signed-off-by: Olof Johansson <olof@lixom.net>
Diffstat (limited to 'arch/arm/mach-bcm')
-rw-r--r--arch/arm/mach-bcm/Kconfig16
-rw-r--r--arch/arm/mach-bcm/Makefile2
-rw-r--r--arch/arm/mach-bcm/board_bcm2835.c137
3 files changed, 155 insertions, 0 deletions
diff --git a/arch/arm/mach-bcm/Kconfig b/arch/arm/mach-bcm/Kconfig
index af4f2dfda40c..396d05c8b570 100644
--- a/arch/arm/mach-bcm/Kconfig
+++ b/arch/arm/mach-bcm/Kconfig
@@ -27,6 +27,22 @@ config ARCH_BCM_MOBILE
BCM11130, BCM11140, BCM11351, BCM28145 and
BCM28155 variants.
+config ARCH_BCM2835
+ bool "Broadcom BCM2835 family" if ARCH_MULTI_V6
+ select ARCH_REQUIRE_GPIOLIB
+ select ARM_AMBA
+ select ARM_ERRATA_411920
+ select ARM_TIMER_SP804
+ select CLKDEV_LOOKUP
+ select CLKSRC_OF
+ select CPU_V6
+ select GENERIC_CLOCKEVENTS
+ select PINCTRL
+ select PINCTRL_BCM2835
+ help
+ This enables support for the Broadcom BCM2835 SoC. This SoC is
+ used in the Raspberry Pi and Roku 2 devices.
+
endmenu
endif
diff --git a/arch/arm/mach-bcm/Makefile b/arch/arm/mach-bcm/Makefile
index c2ccd5a0f772..0ad293882079 100644
--- a/arch/arm/mach-bcm/Makefile
+++ b/arch/arm/mach-bcm/Makefile
@@ -11,5 +11,7 @@
# GNU General Public License for more details.
obj-$(CONFIG_ARCH_BCM_MOBILE) := board_bcm281xx.o bcm_kona_smc.o bcm_kona_smc_asm.o kona.o
+obj-$(CONFIG_ARCH_BCM2835) += board_bcm2835.o
+
plus_sec := $(call as-instr,.arch_extension sec,+sec)
AFLAGS_bcm_kona_smc_asm.o :=-Wa,-march=armv7-a$(plus_sec)
diff --git a/arch/arm/mach-bcm/board_bcm2835.c b/arch/arm/mach-bcm/board_bcm2835.c
new file mode 100644
index 000000000000..70f2f3925f0e
--- /dev/null
+++ b/arch/arm/mach-bcm/board_bcm2835.c
@@ -0,0 +1,137 @@
+/*
+ * Copyright (C) 2010 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; 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.
+ */
+
+#include <linux/delay.h>
+#include <linux/init.h>
+#include <linux/irqchip.h>
+#include <linux/of_address.h>
+#include <linux/of_platform.h>
+#include <linux/clk/bcm2835.h>
+
+#include <asm/mach/arch.h>
+#include <asm/mach/map.h>
+
+#define PM_RSTC 0x1c
+#define PM_RSTS 0x20
+#define PM_WDOG 0x24
+
+#define PM_PASSWORD 0x5a000000
+#define PM_RSTC_WRCFG_MASK 0x00000030
+#define PM_RSTC_WRCFG_FULL_RESET 0x00000020
+#define PM_RSTS_HADWRH_SET 0x00000040
+
+#define BCM2835_PERIPH_PHYS 0x20000000
+#define BCM2835_PERIPH_VIRT 0xf0000000
+#define BCM2835_PERIPH_SIZE SZ_16M
+
+static void __iomem *wdt_regs;
+
+/*
+ * The machine restart method can be called from an atomic context so we won't
+ * be able to ioremap the regs then.
+ */
+static void bcm2835_setup_restart(void)
+{
+ struct device_node *np = of_find_compatible_node(NULL, NULL,
+ "brcm,bcm2835-pm-wdt");
+ if (WARN(!np, "unable to setup watchdog restart"))
+ return;
+
+ wdt_regs = of_iomap(np, 0);
+ WARN(!wdt_regs, "failed to remap watchdog regs");
+}
+
+static void bcm2835_restart(enum reboot_mode mode, const char *cmd)
+{
+ u32 val;
+
+ if (!wdt_regs)
+ return;
+
+ /* use a timeout of 10 ticks (~150us) */
+ writel_relaxed(10 | PM_PASSWORD, wdt_regs + PM_WDOG);
+ val = readl_relaxed(wdt_regs + PM_RSTC);
+ val &= ~PM_RSTC_WRCFG_MASK;
+ val |= PM_PASSWORD | PM_RSTC_WRCFG_FULL_RESET;
+ writel_relaxed(val, wdt_regs + PM_RSTC);
+
+ /* No sleeping, possibly atomic. */
+ mdelay(1);
+}
+
+/*
+ * We can't really power off, but if we do the normal reset scheme, and
+ * indicate to bootcode.bin not to reboot, then most of the chip will be
+ * powered off.
+ */
+static void bcm2835_power_off(void)
+{
+ u32 val;
+
+ /*
+ * We set the watchdog hard reset bit here to distinguish this reset
+ * from the normal (full) reset. bootcode.bin will not reboot after a
+ * hard reset.
+ */
+ val = readl_relaxed(wdt_regs + PM_RSTS);
+ val &= ~PM_RSTC_WRCFG_MASK;
+ val |= PM_PASSWORD | PM_RSTS_HADWRH_SET;
+ writel_relaxed(val, wdt_regs + PM_RSTS);
+
+ /* Continue with normal reset mechanism */
+ bcm2835_restart(REBOOT_HARD, "");
+}
+
+static struct map_desc io_map __initdata = {
+ .virtual = BCM2835_PERIPH_VIRT,
+ .pfn = __phys_to_pfn(BCM2835_PERIPH_PHYS),
+ .length = BCM2835_PERIPH_SIZE,
+ .type = MT_DEVICE
+};
+
+static void __init bcm2835_map_io(void)
+{
+ iotable_init(&io_map, 1);
+}
+
+static void __init bcm2835_init(void)
+{
+ int ret;
+
+ bcm2835_setup_restart();
+ if (wdt_regs)
+ pm_power_off = bcm2835_power_off;
+
+ bcm2835_init_clocks();
+
+ ret = of_platform_populate(NULL, of_default_bus_match_table, NULL,
+ NULL);
+ if (ret) {
+ pr_err("of_platform_populate failed: %d\n", ret);
+ BUG();
+ }
+}
+
+static const char * const bcm2835_compat[] = {
+ "brcm,bcm2835",
+ NULL
+};
+
+DT_MACHINE_START(BCM2835, "BCM2835")
+ .map_io = bcm2835_map_io,
+ .init_irq = irqchip_init,
+ .init_machine = bcm2835_init,
+ .restart = bcm2835_restart,
+ .dt_compat = bcm2835_compat
+MACHINE_END