commit: http://blackfin.uclinux.org/git/?p=linux-kernel;a=commitdiff;h=4a74e57b8ecc8dae0db1ad818f72a18eede68a29 branch: http://blackfin.uclinux.org/git/?p=linux-kernel;a=shortlog;h=refs/heads/trunk
Signed-off-by: Steven Miao <[email protected]> Signed-off-by: Bob Liu <[email protected]> --- arch/blackfin/include/asm/clkdev.h | 14 ++ arch/blackfin/mach-bf609/clock.c | 360 ++++++++++++++++++++++++++++++++++++ arch/blackfin/mach-common/clock.h | 27 +++ 3 files changed, 401 insertions(+), 0 deletions(-) diff --git a/arch/blackfin/include/asm/clkdev.h b/arch/blackfin/include/asm/clkdev.h new file mode 100644 index 0000000..9053bed --- /dev/null +++ b/arch/blackfin/include/asm/clkdev.h @@ -0,0 +1,14 @@ +#ifndef __ASM_CLKDEV__H_ +#define __ASM_CLKDEV__H_ + +#include <linux/slab.h> + +static inline struct clk_lookup_alloc *__clkdev_alloc(size_t size) +{ + return kzalloc(size, GFP_KERNEL); +} + +#define __clk_put(clk) +#define __clk_get(clk) ({ 1; }) + +#endif diff --git a/arch/blackfin/mach-bf609/clock.c b/arch/blackfin/mach-bf609/clock.c new file mode 100644 index 0000000..6cc33b0 --- /dev/null +++ b/arch/blackfin/mach-bf609/clock.c @@ -0,0 +1,360 @@ +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/list.h> +#include <linux/errno.h> +#include <linux/err.h> +#include <linux/string.h> +#include <linux/clk.h> +#include <linux/mutex.h> +#include <linux/spinlock.h> +#include <linux/debugfs.h> +#include <linux/device.h> +#include <linux/init.h> +#include <linux/timer.h> +#include <linux/io.h> +#include <linux/seq_file.h> +#include <linux/clkdev.h> + +#include <asm/clocks.h> + +#define CGU0_CTL_DF (1 << 0) + +#define CGU0_CTL_MSEL_SHIFT 8 +#define CGU0_CTL_MSEL_MASK (0x7f << 8) + +#define CGU0_STAT_PLLEN (1 << 0) +#define CGU0_STAT_PLLBP (1 << 1) +#define CGU0_STAT_PLLLK (1 << 2) +#define CGU0_STAT_CLKSALGN (1 << 3) +#define CGU0_STAT_CCBF0 (1 << 4) +#define CGU0_STAT_CCBF1 (1 << 5) +#define CGU0_STAT_SCBF0 (1 << 6) +#define CGU0_STAT_SCBF1 (1 << 7) +#define CGU0_STAT_DCBF (1 << 8) +#define CGU0_STAT_OCBF (1 << 9) +#define CGU0_STAT_ADDRERR (1 << 16) +#define CGU0_STAT_LWERR (1 << 17) +#define CGU0_STAT_DIVERR (1 << 18) +#define CGU0_STAT_WDFMSERR (1 << 19) +#define CGU0_STAT_WDIVERR (1 << 20) +#define CGU0_STAT_PLOCKERR (1 << 21) + +#define CGU0_DIV_CSEL_SHIFT 0 +#define CGU0_DIV_CSEL_MASK 0x0000001F +#define CGU0_DIV_S0SEL_SHIFT 5 +#define CGU0_DIV_S0SEL_MASK (0x3 << CGU0_DIV_S0SEL_SHIFT) +#define CGU0_DIV_SYSSEL_SHIFT 8 +#define CGU0_DIV_SYSSEL_MASK (0x1f << CGU0_DIV_SYSSEL_SHIFT) +#define CGU0_DIV_S1SEL_SHIFT 13 +#define CGU0_DIV_S1SEL_MASK (0x3 << CGU0_DIV_S1SEL_SHIFT) +#define CGU0_DIV_DSEL_SHIFT 16 +#define CGU0_DIV_DSEL_MASK (0x1f << CGU0_DIV_DSEL_SHIFT) +#define CGU0_DIV_OSEL_SHIFT 22 +#define CGU0_DIV_OSEL_MASK (0x7f << CGU0_DIV_OSEL_SHIFT) + +#define CLK(_clk, _devname, _conname) \ + { \ + .clk = &_clk, \ + .dev_id = _devname, \ + .con_id = _conname, \ + } + +#define NEEDS_INITIALIZATION 0x11 +#define PLL_BYPASS 0x2 + +#define CLK_IN 25000000 + + +static LIST_HEAD(clk_list); + +static void clk_reg_write_mask(u32 reg, uint32_t val, uint32_t mask) +{ + u32 val2; + + val2 = bfin_read32(reg); + val2 &= ~mask; + val2 |= val; + bfin_write32(val2, reg); +} + +static void clk_reg_set_bits(u32 reg, uint32_t mask) +{ + u32 val; + + val = bfin_read32(reg); + val |= mask; + bfin_write32(val, reg); +} + +static void clk_reg_clear_bits(u32 reg, uint32_t mask) +{ + u32 val; + + val = bfin_read32(reg); + val &= ~mask; + bfin_write32(val, reg); +} + +int wait_for_pll_align(void) +{ + int i = 10000; + while (i-- && (bfin_read32(CGU0_STAT) & CGU0_STAT_CLKSALGN)); + + if (bfin_read32(CGU0_STAT) & CGU0_STAT_CLKSALGN) { + printk(KERN_DEBUG "fail to align clk\n"); + return -1; + } +} + +int clk_enable(struct clk *clk) +{ + int ret = -EIO; + if (clk->ops && clk->ops->enable) + ret = clk->ops->enable(clk); + return ret; +} +EXPORT_SYMBOL(clk_enable); + +void clk_disable(struct clk *clk) +{ + if (clk->ops && clk->ops->disable) + clk->ops->disable(clk); +} +EXPORT_SYMBOL(clk_disable); + +unsigned long clk_get_rate(struct clk *clk) +{ + unsigned long ret = 0; + if (clk->ops && clk->ops->get_rate) + ret = clk->ops->get_rate(clk); + return ret; +} +EXPORT_SYMBOL(clk_get_rate); + +long clk_round_rate(struct clk *clk, unsigned long rate) +{ + long ret = -EIO; + if (clk->ops && clk->ops->round_rate) + ret = clk->ops->round_rate(clk, rate); + return ret; +} +EXPORT_SYMBOL(clk_round_rate); + +int clk_set_rate(struct clk *clk, unsigned long rate) +{ + int ret = -EIO; + if (clk->ops && clk->ops->set_rate) + ret = clk->ops->set_rate(clk, rate); + return ret; +} +EXPORT_SYMBOL(clk_set_rate); + +unsigned long vco_get_rate(struct clk *clk) +{ + u32 df; + u32 msel; + return clk->rate; +} + +unsigned long pll_get_rate(struct clk *clk) +{ + u32 df; + u32 msel; + u32 ctl = bfin_read32(CGU0_CTL); + msel = (ctl & CGU0_CTL_MSEL_MASK) >> CGU0_CTL_MSEL_SHIFT; + df = (ctl & CGU0_CTL_DF); + clk->parent->rate = clk_get_rate(clk->parent); + return clk->parent->rate / (df + 1) * msel * 2; +} + +unsigned long pll_round_rate(struct clk *clk, unsigned long rate) +{ + u32 div; + div = rate / clk->parent->rate; + return clk->parent->rate * div; +} + +int pll_set_rate(struct clk *clk, unsigned long rate) +{ + u32 df = 0; + u32 msel; + u32 ctl = bfin_read32(CGU0_CTL); + u32 stat = bfin_read32(CGU0_STAT); + if (!(stat & CGU0_STAT_PLLEN)) + return -1; + if (!(stat & CGU0_STAT_PLLLK)) + return -1; + if (wait_for_pll_align()) + return -1; + msel = rate / clk->parent->rate / 2; + clk_reg_write_mask(CGU0_CTL, msel << CGU0_CTL_MSEL_SHIFT, + CGU0_CTL_MSEL_MASK); + clk->rate = rate; + return 0; +} + +unsigned long cclk_get_rate(struct clk *clk) +{ + if (clk->parent) + return clk->parent->rate; + else + return 0; +} + +unsigned long drate; +unsigned long sys_clk_get_rate(struct clk *clk) +{ + u32 msel; + u32 df; + u32 ctl = bfin_read32(CGU0_CTL); + u32 div = bfin_read32(CGU0_DIV); + msel = (ctl & CGU0_CTL_MSEL_MASK) >> CGU0_CTL_MSEL_SHIFT; + df = (ctl & CGU0_CTL_DF); + div = (div & clk->mask) >> clk->shift; + if (clk->parent->flags & PLL_BYPASS) { + drate = CLK_IN / (df + 1); + drate *= msel; + drate /= div; + return drate; + } else { + clk->parent->rate = clk_get_rate(clk->parent); + return clk->parent->rate / div; + } +} + +int sys_clk_set_rate(struct clk *clk, unsigned long rate) +{ + u32 div; + div = clk->parent->rate / rate; + if (wait_for_pll_align()) + return -1; + clk_reg_write_mask(CGU0_DIV, div << clk->shift, + clk->mask); + clk->rate = rate; + return 0; +} + +static struct clk_ops vco_ops = { + .get_rate = vco_get_rate, +}; + +static struct clk_ops pll_ops = { + .get_rate = pll_get_rate, + .set_rate = pll_set_rate, +}; + +static struct clk_ops cclk_ops = { + .get_rate = cclk_get_rate, +}; + +static struct clk_ops sys_clk_ops = { + .get_rate = sys_clk_get_rate, + .set_rate = sys_clk_set_rate, +}; + +static struct clk sys_clkin = { + .name = "SYS_CLKIN", + .rate = CLK_IN, + .ops = &vco_ops, +}; + +static struct clk pll_clk = { + .name = "PLLCLK", + .rate = 1000000000, + .parent = &sys_clkin, + .ops = &pll_ops, +/* .flags = NEEDS_INITIALIZATION, */ + .flags = PLL_BYPASS, +}; + +static struct clk cclk = { + .name = "CCLK", + .rate = 500000000, + .mask = CGU0_DIV_CSEL_MASK, + .shift = CGU0_DIV_CSEL_SHIFT, + .parent = &pll_clk, + .ops = &sys_clk_ops, + .flags = PLL_BYPASS, +}; + +static struct clk cclk0 = { + .name = "CCLK0", + .parent = &cclk, + .ops = &cclk_ops, +}; + +static struct clk cclk1 = { + .name = "CCLK1", + .parent = &cclk, + .ops = &cclk_ops, +}; + +static struct clk sysclk = { + .name = "SYSCLK", + .rate = 500000000, + .mask = CGU0_DIV_SYSSEL_MASK, + .shift = CGU0_DIV_SYSSEL_SHIFT, + .parent = &pll_clk, + .ops = &sys_clk_ops, +}; + +static struct clk sclk0 = { + .name = "SCLK0", + .rate = 500000000, + .mask = CGU0_DIV_S0SEL_MASK, + .shift = CGU0_DIV_S0SEL_SHIFT, + .parent = &sysclk, + .ops = &sys_clk_ops, +}; + +static struct clk sclk1 = { + .name = "SCLK1", + .rate = 500000000, + .mask = CGU0_DIV_S1SEL_MASK, + .shift = CGU0_DIV_S1SEL_SHIFT, + .parent = &sysclk, + .ops = &sys_clk_ops, +}; + +static struct clk dclk = { + .name = "DCLK", + .rate = 500000000, + .mask = CGU0_DIV_DSEL_MASK, + .shift = CGU0_DIV_DSEL_SHIFT, + .parent = &pll_clk, + .ops = &sys_clk_ops, +}; + +static struct clk oclk = { + .name = "OCLK", + .rate = 500000000, + .mask = CGU0_DIV_OSEL_MASK, + .shift = CGU0_DIV_OSEL_SHIFT, + .parent = &pll_clk, +}; + +static struct clk_lookup bf609_clks[] = { + CLK(sys_clkin, NULL, "SYS_CLKIN"), + CLK(pll_clk, NULL, "PLLCLK"), + CLK(cclk, NULL, "CCLK"), + CLK(cclk0, NULL, "CCLK0"), + CLK(cclk1, NULL, "CCLK1"), + CLK(sysclk, NULL, "SYSCLK"), + CLK(sclk0, NULL, "SCLK0"), + CLK(sclk1, NULL, "SCLK1"), + CLK(dclk, NULL, "DCLK"), + CLK(oclk, NULL, "OCLK"), +}; + +int __init clk_init(void) +{ + int i; + struct clk *clkp; + for (i = 0; i < ARRAY_SIZE(bf609_clks); i++) { + clkp = bf609_clks[i].clk; + if (clkp->flags & NEEDS_INITIALIZATION) + clk_set_rate(clkp, clkp->rate); + } + clkdev_add_table(bf609_clks, ARRAY_SIZE(bf609_clks)); + return 0; +} diff --git a/arch/blackfin/mach-common/clock.h b/arch/blackfin/mach-common/clock.h new file mode 100644 index 0000000..645ff46 --- /dev/null +++ b/arch/blackfin/mach-common/clock.h @@ -0,0 +1,27 @@ +#ifndef __MACH_COMMON_CLKDEV_H +#define __MACH_COMMON_CLKDEV_H + +#include <linux/clk.h> + +struct clk_ops { + unsigned long (*get_rate)(struct clk *clk); + unsigned long (*round_rate)(struct clk *clk, unsigned long rate); + int (*set_rate)(struct clk *clk, unsigned long rate); + int (*enable)(struct clk *clk); + int (*disable)(struct clk *clk); +}; + +struct clk { + const char *name; + unsigned long rate; + spinlock_t lock; + u32 flags; + const struct clk_ops *ops; + const struct params *params; + void __iomem *reg; + u32 mask; + u32 shift; +}; + +#endif +
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