diff options
| author | Chris Brandt <chris.brandt@renesas.com> | 2016-09-02 05:32:25 +0300 |
|---|---|---|
| committer | Geert Uytterhoeven <geert+renesas@glider.be> | 2016-09-05 15:16:25 +0300 |
| commit | b452dfe92f651601d04d7b122d5b96e74d7ae030 (patch) | |
| tree | 5fea9e92a904098003c2d096a4383a0bcf76f487 /drivers/clk/renesas/clk-rz.c | |
| parent | 074969813350cda4c624a585489cc1b3550414bc (diff) | |
| download | linux-b452dfe92f651601d04d7b122d5b96e74d7ae030.tar.xz | |
clk: renesas: rz: Select EXTAL vs USB clock
Check the MD_CLK pin to determine the current clock mode in order to set
the pll clock parent correctly.
Signed-off-by: Chris Brandt <chris.brandt@renesas.com>
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Diffstat (limited to 'drivers/clk/renesas/clk-rz.c')
| -rw-r--r-- | drivers/clk/renesas/clk-rz.c | 24 |
1 files changed, 22 insertions, 2 deletions
diff --git a/drivers/clk/renesas/clk-rz.c b/drivers/clk/renesas/clk-rz.c index f6312c62f16b..5adb934326d1 100644 --- a/drivers/clk/renesas/clk-rz.c +++ b/drivers/clk/renesas/clk-rz.c @@ -25,10 +25,31 @@ struct rz_cpg { #define CPG_FRQCR 0x10 #define CPG_FRQCR2 0x14 +#define PPR0 0xFCFE3200 +#define PIBC0 0xFCFE7000 + +#define MD_CLK(x) ((x >> 2) & 1) /* P0_2 */ + /* ----------------------------------------------------------------------------- * Initialization */ +static u16 __init rz_cpg_read_mode_pins(void) +{ + void __iomem *ppr0, *pibc0; + u16 modes; + + ppr0 = ioremap_nocache(PPR0, 2); + pibc0 = ioremap_nocache(PIBC0, 2); + BUG_ON(!ppr0 || !pibc0); + iowrite16(4, pibc0); /* enable input buffer */ + modes = ioread16(ppr0); + iounmap(ppr0); + iounmap(pibc0); + + return modes; +} + static struct clk * __init rz_cpg_register_clock(struct device_node *np, struct rz_cpg *cpg, const char *name) { @@ -37,8 +58,7 @@ rz_cpg_register_clock(struct device_node *np, struct rz_cpg *cpg, const char *na static const unsigned frqcr_tab[4] = { 3, 2, 0, 1 }; if (strcmp(name, "pll") == 0) { - /* FIXME: cpg_mode should be read from GPIO. But no GPIO support yet */ - unsigned cpg_mode = 0; /* hardcoded to EXTAL for now */ + unsigned int cpg_mode = MD_CLK(rz_cpg_read_mode_pins()); const char *parent_name = of_clk_get_parent_name(np, cpg_mode); mult = cpg_mode ? (32 / 4) : 30; |