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authorLinus Torvalds <torvalds@linux-foundation.org>2014-12-11 17:56:37 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2014-12-11 17:56:37 -0800
commitc0222ac086669a631814bbf857f8c8023452a4d7 (patch)
treebb1d9908031fcf69016eeefa7b35a4f68f414333 /drivers/clk
parent140cd7fb04a4a2bc09a30980bc8104cc89e09330 (diff)
parente2965cd0003f222bd49f67907c2bc6ed691c6d20 (diff)
Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus
Pull MIPS updates from Ralf Baechle: "This is an unusually large pull request for MIPS - in parts because lots of patches missed the 3.18 deadline but primarily because some folks opened the flood gates. - Retire the MIPS-specific phys_t with the generic phys_addr_t. - Improvments for the backtrace code used by oprofile. - Better backtraces on SMP systems. - Cleanups for the Octeon platform code. - Cleanups and fixes for the Loongson platform code. - Cleanups and fixes to the firmware library. - Switch ATH79 platform to use the firmware library. - Grand overhault to the SEAD3 and Malta interrupt code. - Move the GIC interrupt code to drivers/irqchip - Lots of GIC cleanups and updates to the GIC code to use modern IRQ infrastructures and features of the kernel. - OF documentation updates for the GIC bindings - Move GIC clocksource driver to drivers/clocksource - Merge GIC clocksource driver with clockevent driver. - Further updates to bring the GIC clocksource driver up to date. - R3000 TLB code cleanups - Improvments to the Loongson 3 platform code. - Convert pr_warning to pr_warn. - Merge a bunch of small lantiq and ralink fixes that have been staged/lingering inside the openwrt tree for a while. - Update archhelp for IP22/IP32 - Fix a number of issues for Loongson 1B. - New clocksource and clockevent driver for Loongson 1B. - Further work on clk handling for Loongson 1B. - Platform work for Broadcom BMIPS. - Error handling cleanups for TurboChannel. - Fixes and optimization to the microMIPS support. - Option to disable the FTLB. - Dump more relevant information on machine check exception - Change binfmt to allow arch to examine PT_*PROC headers - Support for new style FPU register model in O32 - VDSO randomization. - BCM47xx cleanups - BCM47xx reimplement the way the kernel accesses NVRAM information. - Random cleanups - Add support for ATH25 platforms - Remove pointless locking code in some PCI platforms. - Some improvments to EVA support - Minor Alchemy cleanup" * 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus: (185 commits) MIPS: Add MFHC0 and MTHC0 instructions to uasm. MIPS: Cosmetic cleanups of page table headers. MIPS: Add CP0 macros for extended EntryLo registers MIPS: Remove now unused definition of phys_t. MIPS: Replace use of phys_t with phys_addr_t. MIPS: Replace MIPS-specific 64BIT_PHYS_ADDR with generic PHYS_ADDR_T_64BIT PCMCIA: Alchemy Don't select 64BIT_PHYS_ADDR in Kconfig. MIPS: lib: memset: Clean up some MIPS{EL,EB} ifdefery MIPS: iomap: Use __mem_{read,write}{b,w,l} for MMIO MIPS: <asm/types.h> fix indentation. MAINTAINERS: Add entry for BMIPS multiplatform kernel MIPS: Enable VDSO randomization MIPS: Remove a temporary hack for debugging cache flushes in SMTC configuration MIPS: Remove declaration of obsolete arch_init_clk_ops() MIPS: atomic.h: Reformat to fit in 79 columns MIPS: Apply `.insn' to fixup labels throughout MIPS: Fix microMIPS LL/SC immediate offsets MIPS: Kconfig: Only allow 32-bit microMIPS builds MIPS: signal.c: Fix an invalid cast in ISA mode bit handling MIPS: mm: Only build one microassembler that is suitable ...
Diffstat (limited to 'drivers/clk')
-rw-r--r--drivers/clk/clk-ls1x.c109
1 files changed, 80 insertions, 29 deletions
diff --git a/drivers/clk/clk-ls1x.c b/drivers/clk/clk-ls1x.c
index f20b750235f6..ca80103ac188 100644
--- a/drivers/clk/clk-ls1x.c
+++ b/drivers/clk/clk-ls1x.c
@@ -15,7 +15,8 @@
#include <loongson1.h>
-#define OSC 33
+#define OSC (33 * 1000000)
+#define DIV_APB 2
static DEFINE_SPINLOCK(_lock);
@@ -29,13 +30,12 @@ static void ls1x_pll_clk_disable(struct clk_hw *hw)
}
static unsigned long ls1x_pll_recalc_rate(struct clk_hw *hw,
- unsigned long parent_rate)
+ unsigned long parent_rate)
{
u32 pll, rate;
pll = __raw_readl(LS1X_CLK_PLL_FREQ);
- rate = ((12 + (pll & 0x3f)) * 1000000) +
- ((((pll >> 8) & 0x3ff) * 1000000) >> 10);
+ rate = 12 + (pll & 0x3f) + (((pll >> 8) & 0x3ff) >> 10);
rate *= OSC;
rate >>= 1;
@@ -48,8 +48,10 @@ static const struct clk_ops ls1x_pll_clk_ops = {
.recalc_rate = ls1x_pll_recalc_rate,
};
-static struct clk * __init clk_register_pll(struct device *dev,
- const char *name, const char *parent_name, unsigned long flags)
+static struct clk *__init clk_register_pll(struct device *dev,
+ const char *name,
+ const char *parent_name,
+ unsigned long flags)
{
struct clk_hw *hw;
struct clk *clk;
@@ -78,34 +80,83 @@ static struct clk * __init clk_register_pll(struct device *dev,
return clk;
}
+static const char const *cpu_parents[] = { "cpu_clk_div", "osc_33m_clk", };
+static const char const *ahb_parents[] = { "ahb_clk_div", "osc_33m_clk", };
+static const char const *dc_parents[] = { "dc_clk_div", "osc_33m_clk", };
+
void __init ls1x_clk_init(void)
{
struct clk *clk;
- clk = clk_register_pll(NULL, "pll_clk", NULL, CLK_IS_ROOT);
- clk_prepare_enable(clk);
-
- clk = clk_register_divider(NULL, "cpu_clk", "pll_clk",
- CLK_SET_RATE_PARENT, LS1X_CLK_PLL_DIV, DIV_CPU_SHIFT,
- DIV_CPU_WIDTH, CLK_DIVIDER_ONE_BASED, &_lock);
- clk_prepare_enable(clk);
- clk_register_clkdev(clk, "cpu", NULL);
-
- clk = clk_register_divider(NULL, "dc_clk", "pll_clk",
- CLK_SET_RATE_PARENT, LS1X_CLK_PLL_DIV, DIV_DC_SHIFT,
- DIV_DC_WIDTH, CLK_DIVIDER_ONE_BASED, &_lock);
- clk_prepare_enable(clk);
- clk_register_clkdev(clk, "dc", NULL);
-
- clk = clk_register_divider(NULL, "ahb_clk", "pll_clk",
- CLK_SET_RATE_PARENT, LS1X_CLK_PLL_DIV, DIV_DDR_SHIFT,
- DIV_DDR_WIDTH, CLK_DIVIDER_ONE_BASED, &_lock);
- clk_prepare_enable(clk);
- clk_register_clkdev(clk, "ahb", NULL);
+ clk = clk_register_fixed_rate(NULL, "osc_33m_clk", NULL, CLK_IS_ROOT,
+ OSC);
+ clk_register_clkdev(clk, "osc_33m_clk", NULL);
+
+ /* clock derived from 33 MHz OSC clk */
+ clk = clk_register_pll(NULL, "pll_clk", "osc_33m_clk", 0);
+ clk_register_clkdev(clk, "pll_clk", NULL);
+
+ /* clock derived from PLL clk */
+ /* _____
+ * _______________________| |
+ * OSC ___/ | MUX |___ CPU CLK
+ * \___ PLL ___ CPU DIV ___| |
+ * |_____|
+ */
+ clk = clk_register_divider(NULL, "cpu_clk_div", "pll_clk",
+ CLK_GET_RATE_NOCACHE, LS1X_CLK_PLL_DIV,
+ DIV_CPU_SHIFT, DIV_CPU_WIDTH,
+ CLK_DIVIDER_ONE_BASED |
+ CLK_DIVIDER_ROUND_CLOSEST, &_lock);
+ clk_register_clkdev(clk, "cpu_clk_div", NULL);
+ clk = clk_register_mux(NULL, "cpu_clk", cpu_parents,
+ ARRAY_SIZE(cpu_parents),
+ CLK_SET_RATE_NO_REPARENT, LS1X_CLK_PLL_DIV,
+ BYPASS_CPU_SHIFT, BYPASS_CPU_WIDTH, 0, &_lock);
+ clk_register_clkdev(clk, "cpu_clk", NULL);
+
+ /* _____
+ * _______________________| |
+ * OSC ___/ | MUX |___ DC CLK
+ * \___ PLL ___ DC DIV ___| |
+ * |_____|
+ */
+ clk = clk_register_divider(NULL, "dc_clk_div", "pll_clk",
+ 0, LS1X_CLK_PLL_DIV, DIV_DC_SHIFT,
+ DIV_DC_WIDTH, CLK_DIVIDER_ONE_BASED, &_lock);
+ clk_register_clkdev(clk, "dc_clk_div", NULL);
+ clk = clk_register_mux(NULL, "dc_clk", dc_parents,
+ ARRAY_SIZE(dc_parents),
+ CLK_SET_RATE_NO_REPARENT, LS1X_CLK_PLL_DIV,
+ BYPASS_DC_SHIFT, BYPASS_DC_WIDTH, 0, &_lock);
+ clk_register_clkdev(clk, "dc_clk", NULL);
+
+ /* _____
+ * _______________________| |
+ * OSC ___/ | MUX |___ DDR CLK
+ * \___ PLL ___ DDR DIV ___| |
+ * |_____|
+ */
+ clk = clk_register_divider(NULL, "ahb_clk_div", "pll_clk",
+ 0, LS1X_CLK_PLL_DIV, DIV_DDR_SHIFT,
+ DIV_DDR_WIDTH, CLK_DIVIDER_ONE_BASED,
+ &_lock);
+ clk_register_clkdev(clk, "ahb_clk_div", NULL);
+ clk = clk_register_mux(NULL, "ahb_clk", ahb_parents,
+ ARRAY_SIZE(ahb_parents),
+ CLK_SET_RATE_NO_REPARENT, LS1X_CLK_PLL_DIV,
+ BYPASS_DDR_SHIFT, BYPASS_DDR_WIDTH, 0, &_lock);
+ clk_register_clkdev(clk, "ahb_clk", NULL);
clk_register_clkdev(clk, "stmmaceth", NULL);
- clk = clk_register_fixed_factor(NULL, "apb_clk", "ahb_clk", 0, 1, 2);
- clk_prepare_enable(clk);
- clk_register_clkdev(clk, "apb", NULL);
+ /* clock derived from AHB clk */
+ /* APB clk is always half of the AHB clk */
+ clk = clk_register_fixed_factor(NULL, "apb_clk", "ahb_clk", 0, 1,
+ DIV_APB);
+ clk_register_clkdev(clk, "apb_clk", NULL);
+ clk_register_clkdev(clk, "ls1x_i2c", NULL);
+ clk_register_clkdev(clk, "ls1x_pwmtimer", NULL);
+ clk_register_clkdev(clk, "ls1x_spi", NULL);
+ clk_register_clkdev(clk, "ls1x_wdt", NULL);
clk_register_clkdev(clk, "serial8250", NULL);
}