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author | Linus Torvalds <torvalds@linux-foundation.org> | 2017-07-15 10:59:54 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2017-07-15 10:59:54 -0700 |
commit | 568d135d337d3114688fef9fdbce7fb6dbbd04c7 (patch) | |
tree | b9355b94182a51eec5cfc69dd335e39a2e97ac7d /drivers/clk | |
parent | 4ecd4ff55ac5c7fe9e232f34a41c4d54f2d825c1 (diff) | |
parent | d40e0d4fb5613099a58c95a9403f51b03e40e861 (diff) | |
download | linux-568d135d337d3114688fef9fdbce7fb6dbbd04c7.tar.gz |
Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus
Pull MIPS updates from Ralf Baechle: "Boston platform support: - Document DT bindings - Add CLK driver for board clocks CM: - Avoid per-core locking with CM3 & higher - WARN on attempt to lock invalid VP, not BUG CPS: - Select CONFIG_SYS_SUPPORTS_SCHED_SMT for MIPSr6 - Prevent multi-core with dcache aliasing - Handle cores not powering down more gracefully - Handle spurious VP starts more gracefully DSP: - Add lwx & lhx missaligned access support eBPF: - Add MIPS support along with many supporting change to add the required infrastructure Generic arch code: - Misc sysmips MIPS_ATOMIC_SET fixes - Drop duplicate HAVE_SYSCALL_TRACEPOINTS - Negate error syscall return in trace - Correct forced syscall errors - Traced negative syscalls should return -ENOSYS - Allow samples/bpf/tracex5 to access syscall arguments for sane traces - Cleanup from old Kconfig options in defconfigs - Fix PREF instruction usage by memcpy for MIPS R6 - Fix various special cases in the FPU eulation - Fix some special cases in MIPS16e2 support - Fix MIPS I ISA /proc/cpuinfo reporting - Sort MIPS Kconfig alphabetically - Fix minimum alignment requirement of IRQ stack as required by ABI / GCC - Fix special cases in the module loader - Perform post-DMA cache flushes on systems with MAARs - Probe the I6500 CPU - Cleanup cmpxchg and add support for 1 and 2 byte operations - Use queued read/write locks (qrwlock) - Use queued spinlocks (qspinlock) - Add CPU shared FTLB feature detection - Handle tlbex-tlbp race condition - Allow storing pgd in C0_CONTEXT for MIPSr6 - Use current_cpu_type() in m4kc_tlbp_war() - Support Boston in the generic kernel Generic platform: - yamon-dt: Pull YAMON DT shim code out of SEAD-3 board - yamon-dt: Support > 256MB of RAM - yamon-dt: Use serial* rather than uart* aliases - Abstract FDT fixup application - Set RTC_ALWAYS_BCD to 0 - Add a MAINTAINERS entry core kernel: - qspinlock.c: include linux/prefetch.h Loongson 3: - Add support Perf: - Add I6500 support SEAD-3: - Remove GIC timer from DT - Set interrupt-parent per-device, not at root node - Fix GIC interrupt specifiers SMP: - Skip IPI setup if we only have a single CPU VDSO: - Make comment match reality - Improvements to time code in VDSO" * 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus: (86 commits) locking/qspinlock: Include linux/prefetch.h MIPS: Fix MIPS I ISA /proc/cpuinfo reporting MIPS: Fix minimum alignment requirement of IRQ stack MIPS: generic: Support MIPS Boston development boards MIPS: DTS: img: Don't attempt to build-in all .dtb files clk: boston: Add a driver for MIPS Boston board clocks dt-bindings: Document img,boston-clock binding MIPS: Traced negative syscalls should return -ENOSYS MIPS: Correct forced syscall errors MIPS: Negate error syscall return in trace MIPS: Drop duplicate HAVE_SYSCALL_TRACEPOINTS select MIPS16e2: Provide feature overrides for non-MIPS16 systems MIPS: MIPS16e2: Report ASE presence in /proc/cpuinfo MIPS: MIPS16e2: Subdecode extended LWSP/SWSP instructions MIPS: MIPS16e2: Identify ASE presence MIPS: VDSO: Fix a mismatch between comment and preprocessor constant MIPS: VDSO: Add implementation of gettimeofday() fallback MIPS: VDSO: Add implementation of clock_gettime() fallback MIPS: VDSO: Fix conversions in do_monotonic()/do_monotonic_coarse() MIPS: Use current_cpu_type() in m4kc_tlbp_war() ...
Diffstat (limited to 'drivers/clk')
-rw-r--r-- | drivers/clk/Kconfig | 1 | ||||
-rw-r--r-- | drivers/clk/Makefile | 1 | ||||
-rw-r--r-- | drivers/clk/imgtec/Kconfig | 9 | ||||
-rw-r--r-- | drivers/clk/imgtec/Makefile | 1 | ||||
-rw-r--r-- | drivers/clk/imgtec/clk-boston.c | 103 |
5 files changed, 115 insertions, 0 deletions
diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig index d406b087553f..68ca2d9fcd73 100644 --- a/drivers/clk/Kconfig +++ b/drivers/clk/Kconfig @@ -221,6 +221,7 @@ config COMMON_CLK_VC5 source "drivers/clk/bcm/Kconfig" source "drivers/clk/hisilicon/Kconfig" +source "drivers/clk/imgtec/Kconfig" source "drivers/clk/keystone/Kconfig" source "drivers/clk/mediatek/Kconfig" source "drivers/clk/meson/Kconfig" diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile index 4f6a812342ed..cd376b3fb47a 100644 --- a/drivers/clk/Makefile +++ b/drivers/clk/Makefile @@ -60,6 +60,7 @@ obj-y += bcm/ obj-$(CONFIG_ARCH_BERLIN) += berlin/ obj-$(CONFIG_H8300) += h8300/ obj-$(CONFIG_ARCH_HISI) += hisilicon/ +obj-y += imgtec/ obj-$(CONFIG_ARCH_MXC) += imx/ obj-$(CONFIG_MACH_INGENIC) += ingenic/ obj-$(CONFIG_ARCH_KEYSTONE) += keystone/ diff --git a/drivers/clk/imgtec/Kconfig b/drivers/clk/imgtec/Kconfig new file mode 100644 index 000000000000..f6dcb748e9c4 --- /dev/null +++ b/drivers/clk/imgtec/Kconfig @@ -0,0 +1,9 @@ +config COMMON_CLK_BOSTON + bool "Clock driver for MIPS Boston boards" + depends on MIPS || COMPILE_TEST + select MFD_SYSCON + ---help--- + Enable this to support the system & CPU clocks on the MIPS Boston + development board from Imagination Technologies. These are simple + fixed rate clocks whose rate is determined by reading a platform + provided register. diff --git a/drivers/clk/imgtec/Makefile b/drivers/clk/imgtec/Makefile new file mode 100644 index 000000000000..ac779b8c22f2 --- /dev/null +++ b/drivers/clk/imgtec/Makefile @@ -0,0 +1 @@ +obj-$(CONFIG_COMMON_CLK_BOSTON) += clk-boston.o diff --git a/drivers/clk/imgtec/clk-boston.c b/drivers/clk/imgtec/clk-boston.c new file mode 100644 index 000000000000..f18f10351785 --- /dev/null +++ b/drivers/clk/imgtec/clk-boston.c @@ -0,0 +1,103 @@ +/* + * Copyright (C) 2016-2017 Imagination Technologies + * Author: Paul Burton <paul.burton@imgtec.com> + * + * 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. + */ + +#define pr_fmt(fmt) "clk-boston: " fmt + +#include <linux/clk-provider.h> +#include <linux/kernel.h> +#include <linux/of.h> +#include <linux/regmap.h> +#include <linux/slab.h> +#include <linux/mfd/syscon.h> + +#include <dt-bindings/clock/boston-clock.h> + +#define BOSTON_PLAT_MMCMDIV 0x30 +# define BOSTON_PLAT_MMCMDIV_CLK0DIV (0xff << 0) +# define BOSTON_PLAT_MMCMDIV_INPUT (0xff << 8) +# define BOSTON_PLAT_MMCMDIV_MUL (0xff << 16) +# define BOSTON_PLAT_MMCMDIV_CLK1DIV (0xff << 24) + +#define BOSTON_CLK_COUNT 3 + +static u32 ext_field(u32 val, u32 mask) +{ + return (val & mask) >> (ffs(mask) - 1); +} + +static void __init clk_boston_setup(struct device_node *np) +{ + unsigned long in_freq, cpu_freq, sys_freq; + uint mmcmdiv, mul, cpu_div, sys_div; + struct clk_hw_onecell_data *onecell; + struct regmap *regmap; + struct clk_hw *hw; + int err; + + regmap = syscon_node_to_regmap(np->parent); + if (IS_ERR(regmap)) { + pr_err("failed to find regmap\n"); + return; + } + + err = regmap_read(regmap, BOSTON_PLAT_MMCMDIV, &mmcmdiv); + if (err) { + pr_err("failed to read mmcm_div register: %d\n", err); + return; + } + + in_freq = ext_field(mmcmdiv, BOSTON_PLAT_MMCMDIV_INPUT) * 1000000; + mul = ext_field(mmcmdiv, BOSTON_PLAT_MMCMDIV_MUL); + + sys_div = ext_field(mmcmdiv, BOSTON_PLAT_MMCMDIV_CLK0DIV); + sys_freq = mult_frac(in_freq, mul, sys_div); + + cpu_div = ext_field(mmcmdiv, BOSTON_PLAT_MMCMDIV_CLK1DIV); + cpu_freq = mult_frac(in_freq, mul, cpu_div); + + onecell = kzalloc(sizeof(*onecell) + + (BOSTON_CLK_COUNT * sizeof(struct clk_hw *)), + GFP_KERNEL); + if (!onecell) + return; + + onecell->num = BOSTON_CLK_COUNT; + + hw = clk_hw_register_fixed_rate(NULL, "input", NULL, 0, in_freq); + if (IS_ERR(hw)) { + pr_err("failed to register input clock: %ld\n", PTR_ERR(hw)); + return; + } + onecell->hws[BOSTON_CLK_INPUT] = hw; + + hw = clk_hw_register_fixed_rate(NULL, "sys", "input", 0, sys_freq); + if (IS_ERR(hw)) { + pr_err("failed to register sys clock: %ld\n", PTR_ERR(hw)); + return; + } + onecell->hws[BOSTON_CLK_SYS] = hw; + + hw = clk_hw_register_fixed_rate(NULL, "cpu", "input", 0, cpu_freq); + if (IS_ERR(hw)) { + pr_err("failed to register cpu clock: %ld\n", PTR_ERR(hw)); + return; + } + onecell->hws[BOSTON_CLK_CPU] = hw; + + err = of_clk_add_hw_provider(np, of_clk_hw_onecell_get, onecell); + if (err) + pr_err("failed to add DT provider: %d\n", err); +} + +/* + * Use CLK_OF_DECLARE so that this driver is probed early enough to provide the + * CPU frequency for use with the GIC or cop0 counters/timers. + */ +CLK_OF_DECLARE(clk_boston, "img,boston-clock", clk_boston_setup); |