| // SPDX-License-Identifier: GPL-2.0 |
| #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 |
| |
| 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(reg, val2); |
| } |
| |
| 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_CRIT "fail to align clk\n"); |
| return -1; |
| } |
| |
| return 0; |
| } |
| |
| 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) |
| return; |
| |
| 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 = 0; |
| 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) |
| { |
| return clk->rate; |
| } |
| |
| unsigned long pll_get_rate(struct clk *clk) |
| { |
| u32 df; |
| u32 msel; |
| u32 ctl = bfin_read32(CGU0_CTL); |
| u32 stat = bfin_read32(CGU0_STAT); |
| if (stat & CGU0_STAT_PLLBP) |
| return 0; |
| 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 msel; |
| u32 stat = bfin_read32(CGU0_STAT); |
| if (!(stat & CGU0_STAT_PLLEN)) |
| return -EBUSY; |
| if (!(stat & CGU0_STAT_PLLLK)) |
| return -EBUSY; |
| if (wait_for_pll_align()) |
| return -EBUSY; |
| 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 sys_clk_get_rate(struct clk *clk) |
| { |
| unsigned long drate; |
| u32 msel; |
| u32 df; |
| u32 ctl = bfin_read32(CGU0_CTL); |
| u32 div = bfin_read32(CGU0_DIV); |
| div = (div & clk->mask) >> clk->shift; |
| msel = (ctl & CGU0_CTL_MSEL_MASK) >> CGU0_CTL_MSEL_SHIFT; |
| df = (ctl & CGU0_CTL_DF); |
| |
| if (!strcmp(clk->parent->name, "SYS_CLKIN")) { |
| drate = clk->parent->rate / (df + 1); |
| drate *= msel; |
| drate /= div; |
| return drate; |
| } else { |
| clk->parent->rate = clk_get_rate(clk->parent); |
| return clk->parent->rate / div; |
| } |
| } |
| |
| unsigned long dummy_get_rate(struct clk *clk) |
| { |
| clk->parent->rate = clk_get_rate(clk->parent); |
| return clk->parent->rate; |
| } |
| |
| unsigned long sys_clk_round_rate(struct clk *clk, unsigned long rate) |
| { |
| unsigned long max_rate; |
| unsigned long drate; |
| int i; |
| u32 msel; |
| u32 df; |
| u32 ctl = bfin_read32(CGU0_CTL); |
| |
| msel = (ctl & CGU0_CTL_MSEL_MASK) >> CGU0_CTL_MSEL_SHIFT; |
| df = (ctl & CGU0_CTL_DF); |
| max_rate = clk->parent->rate / (df + 1) * msel; |
| |
| if (rate > max_rate) |
| return 0; |
| |
| for (i = 1; i < clk->mask; i++) { |
| drate = max_rate / i; |
| if (rate >= drate) |
| return drate; |
| } |
| return 0; |
| } |
| |
| int sys_clk_set_rate(struct clk *clk, unsigned long rate) |
| { |
| u32 div = bfin_read32(CGU0_DIV); |
| div = (div & clk->mask) >> clk->shift; |
| |
| rate = clk_round_rate(clk, rate); |
| |
| if (!rate) |
| return -EINVAL; |
| |
| div = (clk_get_rate(clk) * div) / rate; |
| |
| if (wait_for_pll_align()) |
| return -EBUSY; |
| 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, |
| .round_rate = sys_clk_round_rate, |
| }; |
| |
| static struct clk_ops dummy_clk_ops = { |
| .get_rate = dummy_get_rate, |
| }; |
| |
| static struct clk sys_clkin = { |
| .name = "SYS_CLKIN", |
| .rate = CONFIG_CLKIN_HZ, |
| .ops = &vco_ops, |
| }; |
| |
| static struct clk pll_clk = { |
| .name = "PLLCLK", |
| .rate = 500000000, |
| .parent = &sys_clkin, |
| .ops = &pll_ops, |
| .flags = NEEDS_INITIALIZATION, |
| }; |
| |
| static struct clk cclk = { |
| .name = "CCLK", |
| .rate = 500000000, |
| .mask = CGU0_DIV_CSEL_MASK, |
| .shift = CGU0_DIV_CSEL_SHIFT, |
| .parent = &sys_clkin, |
| .ops = &sys_clk_ops, |
| .flags = NEEDS_INITIALIZATION, |
| }; |
| |
| 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 = &sys_clkin, |
| .ops = &sys_clk_ops, |
| .flags = NEEDS_INITIALIZATION, |
| }; |
| |
| 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 = &sys_clkin, |
| .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 ethclk = { |
| .name = "stmmaceth", |
| .parent = &sclk0, |
| .ops = &dummy_clk_ops, |
| }; |
| |
| static struct clk ethpclk = { |
| .name = "pclk", |
| .parent = &sclk0, |
| .ops = &dummy_clk_ops, |
| }; |
| |
| static struct clk spiclk = { |
| .name = "spi", |
| .parent = &sclk1, |
| .ops = &dummy_clk_ops, |
| }; |
| |
| 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"), |
| CLK(ethclk, NULL, "stmmaceth"), |
| CLK(ethpclk, NULL, "pclk"), |
| CLK(spiclk, NULL, "spi"), |
| }; |
| |
| 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_get_rate(clkp); |
| } |
| clkdev_add_table(bf609_clks, ARRAY_SIZE(bf609_clks)); |
| return 0; |
| } |
