| Message ID | 1370272196-4346-5-git-send-email-yadi.brar@samsung.com (mailing list archive) |
|---|---|
| State | Not Applicable, archived |
| Headers | show |
Hi Yadwinder, Vikas, On Monday 03 of June 2013 20:39:54 Yadwinder Singh Brar wrote: > From: Vikas Sajjan <vikas.sajjan@linaro.org> > > This patch adds set_rate and round_rate clk_ops for PLL36xx > > Reviewed-by: Tomasz Figa <t.figa@samsung.com> > Reviewed-by: Doug Anderson <dianders@chromium.org> > Signed-off-by: Vikas Sajjan <vikas.sajjan@linaro.org> > --- > drivers/clk/samsung/clk-pll.c | 79 > ++++++++++++++++++++++++++++++++++++++++- 1 files changed, 78 > insertions(+), 1 deletions(-) > > diff --git a/drivers/clk/samsung/clk-pll.c > b/drivers/clk/samsung/clk-pll.c index 319b52b..42b60b5 100644 > --- a/drivers/clk/samsung/clk-pll.c > +++ b/drivers/clk/samsung/clk-pll.c > @@ -215,6 +215,9 @@ struct clk * __init > samsung_clk_register_pll35xx(const char *name, #define > PLL36XX_CON0_OFFSET (0x100) > #define PLL36XX_CON1_OFFSET (0x104) > > +/* Maximum lock time can be 3000 * PDIV cycles */ > +#define PLL36XX_LOCK_FACTOR (3000) > + > #define PLL36XX_KDIV_MASK (0xFFFF) > #define PLL36XX_MDIV_MASK (0x1FF) > #define PLL36XX_PDIV_MASK (0x3F) > @@ -222,6 +225,8 @@ struct clk * __init > samsung_clk_register_pll35xx(const char *name, #define > PLL36XX_MDIV_SHIFT (16) > #define PLL36XX_PDIV_SHIFT (8) > #define PLL36XX_SDIV_SHIFT (0) > +#define PLL36XX_KDIV_SHIFT (0) > +#define PLL36XX_LOCK_STAT_SHIFT (29) > > static unsigned long samsung_pll36xx_recalc_rate(struct clk_hw *hw, > unsigned long parent_rate) > @@ -244,8 +249,78 @@ static unsigned long > samsung_pll36xx_recalc_rate(struct clk_hw *hw, return (unsigned > long)fvco; > } > > +static inline bool samsung_pll36xx_mpk_change( > + const struct samsung_pll_rate_table *rate, u32 pll_con0, u32 pll_con1) > +{ > + u32 old_mdiv, old_pdiv, old_kdiv; > + > + old_mdiv = (pll_con0 >> PLL36XX_MDIV_SHIFT) & PLL36XX_MDIV_MASK; > + old_pdiv = (pll_con0 >> PLL36XX_PDIV_SHIFT) & PLL36XX_PDIV_MASK; > + old_kdiv = (pll_con1 >> PLL36XX_KDIV_SHIFT) & PLL36XX_KDIV_MASK; > + > + return (rate->mdiv != old_mdiv || rate->pdiv != old_pdiv || > + rate->kdiv != old_kdiv); > +} > + > +static int samsung_pll36xx_set_rate(struct clk_hw *hw, unsigned long > drate, + unsigned long parent_rate) > +{ > + struct samsung_clk_pll *pll = to_clk_pll(hw); > + u32 tmp, pll_con0, pll_con1; > + const struct samsung_pll_rate_table *rate; > + > + rate = samsung_get_pll_settings(pll, drate); > + if (!rate) { > + pr_err("%s: Invalid rate : %lu for pll clk %s\n", __func__, > + drate, __clk_get_name(hw->clk)); > + return -EINVAL; > + } > + > + pll_con0 = pll_readl(pll, PLL36XX_CON0_OFFSET); > + pll_con1 = pll_readl(pll, PLL36XX_CON1_OFFSET); > + > + if (!(samsung_pll36xx_mpk_change(rate, pll_con0, pll_con1))) { > + /* If only s change, change just s value only*/ > + pll_con0 &= ~(PLL36XX_SDIV_MASK << PLL36XX_SDIV_SHIFT); > + pll_con0 |= (rate->sdiv << PLL36XX_SDIV_SHIFT); > + pll_writel(pll, pll_con0, PLL36XX_CON0_OFFSET); nit, I would put an empty line before the return statement here, to make it stand out a bit more. Otherwise looks fine for me. Reviewed-by: Tomasz Figa <t.figa@samsung.com> Best regards, Tomasz > + return 0; > + } > + > + /* Set PLL lock time. */ > + pll_writel(pll, (rate->pdiv * PLL36XX_LOCK_FACTOR), > + PLL36XX_LOCK_OFFSET); > + > + /* Change PLL PMS values */ > + pll_con0 &= ~((PLL36XX_MDIV_MASK << PLL36XX_MDIV_SHIFT) | > + (PLL36XX_PDIV_MASK << PLL36XX_PDIV_SHIFT) | > + (PLL36XX_SDIV_MASK << PLL36XX_SDIV_SHIFT)); > + pll_con0 |= (rate->mdiv << PLL36XX_MDIV_SHIFT) | > + (rate->pdiv << PLL36XX_PDIV_SHIFT) | > + (rate->sdiv << PLL36XX_SDIV_SHIFT); > + pll_writel(pll, pll_con0, PLL36XX_CON0_OFFSET); > + > + pll_con1 &= ~(PLL36XX_KDIV_MASK << PLL36XX_KDIV_SHIFT); > + pll_con1 |= rate->kdiv << PLL36XX_KDIV_SHIFT; > + pll_writel(pll, pll_con1, PLL36XX_CON1_OFFSET); > + > + /* wait_lock_time */ > + do { > + cpu_relax(); > + tmp = pll_readl(pll, PLL36XX_CON0_OFFSET); > + } while (!(tmp & (1 << PLL36XX_LOCK_STAT_SHIFT))); > + > + return 0; > +} > + > static const struct clk_ops samsung_pll36xx_clk_ops = { > .recalc_rate = samsung_pll36xx_recalc_rate, > + .set_rate = samsung_pll36xx_set_rate, > + .round_rate = samsung_pll_round_rate, > +}; > + > +static const struct clk_ops samsung_pll36xx_clk_min_ops = { > + .recalc_rate = samsung_pll36xx_recalc_rate, > }; > > struct clk * __init samsung_clk_register_pll36xx(const char *name, > @@ -264,7 +339,6 @@ struct clk * __init > samsung_clk_register_pll36xx(const char *name, } > > init.name = name; > - init.ops = &samsung_pll36xx_clk_ops; > init.flags = CLK_GET_RATE_NOCACHE; > init.parent_names = &pname; > init.num_parents = 1; > @@ -273,6 +347,9 @@ struct clk * __init > samsung_clk_register_pll36xx(const char *name, pll->rate_count = > rate_count; > pll->rate_table = kmemdup(rate_table, rate_count * > sizeof(struct samsung_pll_rate_table), GFP_KERNEL); > + init.ops = &samsung_pll36xx_clk_ops; > + } else { > + init.ops = &samsung_pll36xx_clk_min_ops; > } > > pll->hw.init = &init; -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/drivers/clk/samsung/clk-pll.c b/drivers/clk/samsung/clk-pll.c index 319b52b..42b60b5 100644 --- a/drivers/clk/samsung/clk-pll.c +++ b/drivers/clk/samsung/clk-pll.c @@ -215,6 +215,9 @@ struct clk * __init samsung_clk_register_pll35xx(const char *name, #define PLL36XX_CON0_OFFSET (0x100) #define PLL36XX_CON1_OFFSET (0x104) +/* Maximum lock time can be 3000 * PDIV cycles */ +#define PLL36XX_LOCK_FACTOR (3000) + #define PLL36XX_KDIV_MASK (0xFFFF) #define PLL36XX_MDIV_MASK (0x1FF) #define PLL36XX_PDIV_MASK (0x3F) @@ -222,6 +225,8 @@ struct clk * __init samsung_clk_register_pll35xx(const char *name, #define PLL36XX_MDIV_SHIFT (16) #define PLL36XX_PDIV_SHIFT (8) #define PLL36XX_SDIV_SHIFT (0) +#define PLL36XX_KDIV_SHIFT (0) +#define PLL36XX_LOCK_STAT_SHIFT (29) static unsigned long samsung_pll36xx_recalc_rate(struct clk_hw *hw, unsigned long parent_rate) @@ -244,8 +249,78 @@ static unsigned long samsung_pll36xx_recalc_rate(struct clk_hw *hw, return (unsigned long)fvco; } +static inline bool samsung_pll36xx_mpk_change( + const struct samsung_pll_rate_table *rate, u32 pll_con0, u32 pll_con1) +{ + u32 old_mdiv, old_pdiv, old_kdiv; + + old_mdiv = (pll_con0 >> PLL36XX_MDIV_SHIFT) & PLL36XX_MDIV_MASK; + old_pdiv = (pll_con0 >> PLL36XX_PDIV_SHIFT) & PLL36XX_PDIV_MASK; + old_kdiv = (pll_con1 >> PLL36XX_KDIV_SHIFT) & PLL36XX_KDIV_MASK; + + return (rate->mdiv != old_mdiv || rate->pdiv != old_pdiv || + rate->kdiv != old_kdiv); +} + +static int samsung_pll36xx_set_rate(struct clk_hw *hw, unsigned long drate, + unsigned long parent_rate) +{ + struct samsung_clk_pll *pll = to_clk_pll(hw); + u32 tmp, pll_con0, pll_con1; + const struct samsung_pll_rate_table *rate; + + rate = samsung_get_pll_settings(pll, drate); + if (!rate) { + pr_err("%s: Invalid rate : %lu for pll clk %s\n", __func__, + drate, __clk_get_name(hw->clk)); + return -EINVAL; + } + + pll_con0 = pll_readl(pll, PLL36XX_CON0_OFFSET); + pll_con1 = pll_readl(pll, PLL36XX_CON1_OFFSET); + + if (!(samsung_pll36xx_mpk_change(rate, pll_con0, pll_con1))) { + /* If only s change, change just s value only*/ + pll_con0 &= ~(PLL36XX_SDIV_MASK << PLL36XX_SDIV_SHIFT); + pll_con0 |= (rate->sdiv << PLL36XX_SDIV_SHIFT); + pll_writel(pll, pll_con0, PLL36XX_CON0_OFFSET); + return 0; + } + + /* Set PLL lock time. */ + pll_writel(pll, (rate->pdiv * PLL36XX_LOCK_FACTOR), + PLL36XX_LOCK_OFFSET); + + /* Change PLL PMS values */ + pll_con0 &= ~((PLL36XX_MDIV_MASK << PLL36XX_MDIV_SHIFT) | + (PLL36XX_PDIV_MASK << PLL36XX_PDIV_SHIFT) | + (PLL36XX_SDIV_MASK << PLL36XX_SDIV_SHIFT)); + pll_con0 |= (rate->mdiv << PLL36XX_MDIV_SHIFT) | + (rate->pdiv << PLL36XX_PDIV_SHIFT) | + (rate->sdiv << PLL36XX_SDIV_SHIFT); + pll_writel(pll, pll_con0, PLL36XX_CON0_OFFSET); + + pll_con1 &= ~(PLL36XX_KDIV_MASK << PLL36XX_KDIV_SHIFT); + pll_con1 |= rate->kdiv << PLL36XX_KDIV_SHIFT; + pll_writel(pll, pll_con1, PLL36XX_CON1_OFFSET); + + /* wait_lock_time */ + do { + cpu_relax(); + tmp = pll_readl(pll, PLL36XX_CON0_OFFSET); + } while (!(tmp & (1 << PLL36XX_LOCK_STAT_SHIFT))); + + return 0; +} + static const struct clk_ops samsung_pll36xx_clk_ops = { .recalc_rate = samsung_pll36xx_recalc_rate, + .set_rate = samsung_pll36xx_set_rate, + .round_rate = samsung_pll_round_rate, +}; + +static const struct clk_ops samsung_pll36xx_clk_min_ops = { + .recalc_rate = samsung_pll36xx_recalc_rate, }; struct clk * __init samsung_clk_register_pll36xx(const char *name, @@ -264,7 +339,6 @@ struct clk * __init samsung_clk_register_pll36xx(const char *name, } init.name = name; - init.ops = &samsung_pll36xx_clk_ops; init.flags = CLK_GET_RATE_NOCACHE; init.parent_names = &pname; init.num_parents = 1; @@ -273,6 +347,9 @@ struct clk * __init samsung_clk_register_pll36xx(const char *name, pll->rate_count = rate_count; pll->rate_table = kmemdup(rate_table, rate_count * sizeof(struct samsung_pll_rate_table), GFP_KERNEL); + init.ops = &samsung_pll36xx_clk_ops; + } else { + init.ops = &samsung_pll36xx_clk_min_ops; } pll->hw.init = &init;