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clk: samsung: add pll_6552 variant for s3c2416 

According to the manual s3c2416 and s3c2450 use a pll 6552 and 6553
and while the pll_6553 matches exactly the one already implemented
the pll_6552 differs to the one from the s3c64xx series.

The change is solely in the bit locations of the mdiv and pdiv values.
All calculations are the same for both implementatons and even the
proposed divider-values for specific frequencies in the manuals are
the same.

Therefore implement a variant that simply uses the changed bit
locations if necessary.

Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Acked-by: Tomasz Figa <t.figa@samsung.com>
Acked-by: Mike Turquette <mturquette@linaro.org>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
hifive-unleashed-5.1
Heiko Stuebner 2014-02-19 09:25:36 +09:00 committed by Kukjin Kim
parent c9eaa447e7
commit 06654acb66
2 changed files with 11 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
drivers/clk/samsung/clk-pll.c
View File

@ -564,7 +564,9 @@ static const struct clk_ops samsung_pll46xx_clk_min_ops = {
#define PLL6552_PDIV_MASK 0x3f
#define PLL6552_SDIV_MASK 0x7
#define PLL6552_MDIV_SHIFT 16
#define PLL6552_MDIV_SHIFT_2416 14
#define PLL6552_PDIV_SHIFT 8
#define PLL6552_PDIV_SHIFT_2416 5
#define PLL6552_SDIV_SHIFT 0
static unsigned long samsung_pll6552_recalc_rate(struct clk_hw *hw,
@ -575,8 +577,13 @@ static unsigned long samsung_pll6552_recalc_rate(struct clk_hw *hw,
u64 fvco = parent_rate;
pll_con = __raw_readl(pll->con_reg);
mdiv = (pll_con >> PLL6552_MDIV_SHIFT) & PLL6552_MDIV_MASK;
pdiv = (pll_con >> PLL6552_PDIV_SHIFT) & PLL6552_PDIV_MASK;
if (pll->type == pll_6552_s3c2416) {
mdiv = (pll_con >> PLL6552_MDIV_SHIFT_2416) & PLL6552_MDIV_MASK;
pdiv = (pll_con >> PLL6552_PDIV_SHIFT_2416) & PLL6552_PDIV_MASK;
} else {
mdiv = (pll_con >> PLL6552_MDIV_SHIFT) & PLL6552_MDIV_MASK;
pdiv = (pll_con >> PLL6552_PDIV_SHIFT) & PLL6552_PDIV_MASK;
}
sdiv = (pll_con >> PLL6552_SDIV_SHIFT) & PLL6552_SDIV_MASK;
fvco *= mdiv;
@ -773,6 +780,7 @@ static void __init _samsung_clk_register_pll(struct samsung_pll_clock *pll_clk,
init.ops = &samsung_pll36xx_clk_ops;
break;
case pll_6552:
case pll_6552_s3c2416:
init.ops = &samsung_pll6552_clk_ops;
break;
case pll_6553:

1
drivers/clk/samsung/clk-pll.h
View File

@ -24,6 +24,7 @@ enum samsung_pll_type {
pll_4650,
pll_4650c,
pll_6552,
pll_6552_s3c2416,
pll_6553,
};