blackfin: bf60x: add clock support

Add clock support for bf60x.

Signed-off-by: Steven Miao <realmz6@gmail.com>
Signed-off-by: Bob Liu <lliubbo@gmail.com>
This commit is contained in:
Steven Miao 2012-05-16 17:49:52 +08:00 committed by Bob Liu
parent b5affb0147
commit 969003152a
6 changed files with 495 additions and 2 deletions

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@ -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

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@ -48,4 +48,27 @@
# define CONFIG_VCO_MULT 0
#endif
#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 {
struct clk *parent;
const char *name;
unsigned long rate;
spinlock_t lock;
u32 flags;
const struct clk_ops *ops;
void __iomem *reg;
u32 mask;
u32 shift;
};
int clk_init(void);
#endif

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@ -0,0 +1,390 @@
#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);
}
static void clk_reg_set_bits(u32 reg, uint32_t mask)
{
u32 val;
val = bfin_read32(reg);
val |= mask;
bfin_write32(reg, val);
}
static void clk_reg_clear_bits(u32 reg, uint32_t mask)
{
u32 val;
val = bfin_read32(reg);
val &= ~mask;
bfin_write32(reg, val);
}
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;
}
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->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)
{
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 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 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 = &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_get_rate(clkp);
}
clkdev_add_table(bf609_clks, ARRAY_SIZE(bf609_clks));
return 0;
}

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@ -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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@ -33,6 +33,8 @@ void init_clocks(void)
* in the middle of reprogramming things, and that'll screw us up.
* For example, any automatic DMAs left by U-Boot for splash screens.
*/
#if 0
size_t i;
for (i = 0; i < MAX_DMA_CHANNELS; ++i) {
struct dma_register *dma = dma_io_base_addr[i];
@ -93,4 +95,6 @@ void init_clocks(void)
#endif
do_sync();
bfin_read16(0);
#endif
}

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@ -10,6 +10,7 @@
#include <linux/module.h>
#include <linux/types.h>
#include <linux/init.h>
#include <linux/clk.h>
#include <linux/cpufreq.h>
#include <linux/fs.h>
#include <linux/delay.h>
@ -17,6 +18,7 @@
#include <asm/time.h>
#include <asm/dpmc.h>
/* this is the table of CCLK frequencies, in Hz */
/* .index is the entry in the auxiliary dpm_state_table[] */
static struct cpufreq_frequency_table bfin_freq_table[] = {
@ -67,12 +69,22 @@ static void __init bfin_init_tables(unsigned long cclk, unsigned long sclk)
#else
min_cclk = sclk;
#endif
#ifndef CONFIG_BF60x
csel = ((bfin_read_PLL_DIV() & CSEL) >> 4);
#else
csel = bfin_read32(CGU0_DIV) & 0x1F;
#endif
for (index = 0; (cclk >> index) >= min_cclk && csel <= 3; index++, csel++) {
bfin_freq_table[index].frequency = cclk >> index;
#ifndef CONFIG_BF60x
dpm_state_table[index].csel = csel << 4; /* Shift now into PLL_DIV bitpos */
dpm_state_table[index].tscale = (TIME_SCALE / (1 << csel)) - 1;
#else
dpm_state_table[index].csel = csel;
dpm_state_table[index].tscale = TIME_SCALE >> index;
#endif
pr_debug("cpufreq: freq:%d csel:0x%x tscale:%d\n",
bfin_freq_table[index].frequency,
@ -99,6 +111,20 @@ static unsigned int bfin_getfreq_khz(unsigned int cpu)
return get_cclk() / 1000;
}
unsigned long cpu_set_cclk(int cpu, unsigned long new)
{
struct clk *clk;
int ret;
clk = clk_get(NULL, "CCLK");
if (IS_ERR(clk))
return -ENODEV;
ret = clk_set_rate(clk, new);
clk_put(clk);
return ret;
}
static int bfin_target(struct cpufreq_policy *poli,
unsigned int target_freq, unsigned int relation)
{
@ -107,6 +133,7 @@ static int bfin_target(struct cpufreq_policy *poli,
struct cpufreq_freqs freqs;
static unsigned long lpj_ref;
static unsigned int lpj_ref_freq;
int ret = 0;
#if defined(CONFIG_CYCLES_CLOCKSOURCE)
cycles_t cycles;
@ -134,9 +161,17 @@ static int bfin_target(struct cpufreq_policy *poli,
cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
if (cpu == CPUFREQ_CPU) {
flags = hard_local_irq_save();
#ifndef CONFIG_BF60x
plldiv = (bfin_read_PLL_DIV() & SSEL) |
dpm_state_table[index].csel;
bfin_write_PLL_DIV(plldiv);
#else
ret = cpu_set_cclk(cpu, freqs.new * 1000);
if (ret != 0) {
pr_debug("cpufreq set freq failed %d\n", ret);
break;
}
#endif
on_each_cpu(bfin_adjust_core_timer, &index, 1);
#if defined(CONFIG_CYCLES_CLOCKSOURCE)
cycles = get_cycles();
@ -161,7 +196,7 @@ static int bfin_target(struct cpufreq_policy *poli,
}
pr_debug("cpufreq: done\n");
return 0;
return ret;
}
static int bfin_verify_speed(struct cpufreq_policy *policy)
@ -169,7 +204,7 @@ static int bfin_verify_speed(struct cpufreq_policy *policy)
return cpufreq_frequency_table_verify(policy, bfin_freq_table);
}
static int __init __bfin_cpu_init(struct cpufreq_policy *policy)
static int __bfin_cpu_init(struct cpufreq_policy *policy)
{
unsigned long cclk, sclk;