diff options
| author | Nicolas Ferre <nicolas.ferre@atmel.com> | 2015-06-17 14:40:39 +0200 |
|---|---|---|
| committer | Stephen Boyd <sboyd@codeaurora.org> | 2015-10-01 12:39:43 -0700 |
| commit | 36844bdf651a2ae2d35ae4b11337671905b67bff (patch) | |
| tree | 8f0b69cce35a77befce1fec3c0c7d0c027e63978 /drivers/clk/at91 | |
| parent | 96ef36e9c424b7a66413bb9229ef5afcddf4fef4 (diff) | |
| download | linux-36844bdf651a2ae2d35ae4b11337671905b67bff.tar.bz2 | |
clk: at91: modify PMC peripheral clock to deal with newer register layout
As some more information is added to the PCR register, we'd better use
a copy of its content and modify just the peripheral-related bits.
Implement a read-modify-write for the enable() and disable() callbacks.
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Diffstat (limited to 'drivers/clk/at91')
| -rw-r--r-- | drivers/clk/at91/clk-peripheral.c | 20 |
1 files changed, 14 insertions, 6 deletions
diff --git a/drivers/clk/at91/clk-peripheral.c b/drivers/clk/at91/clk-peripheral.c index 0a66b959f99b..58f3b568e9cb 100644 --- a/drivers/clk/at91/clk-peripheral.c +++ b/drivers/clk/at91/clk-peripheral.c @@ -161,14 +161,18 @@ static int clk_sam9x5_peripheral_enable(struct clk_hw *hw) { struct clk_sam9x5_peripheral *periph = to_clk_sam9x5_peripheral(hw); struct at91_pmc *pmc = periph->pmc; + u32 tmp; if (periph->id < PERIPHERAL_ID_MIN) return 0; - pmc_write(pmc, AT91_PMC_PCR, (periph->id & AT91_PMC_PCR_PID_MASK) | - AT91_PMC_PCR_CMD | - AT91_PMC_PCR_DIV(periph->div) | - AT91_PMC_PCR_EN); + pmc_lock(pmc); + pmc_write(pmc, AT91_PMC_PCR, (periph->id & AT91_PMC_PCR_PID_MASK)); + tmp = pmc_read(pmc, AT91_PMC_PCR) & ~AT91_PMC_PCR_DIV_MASK; + pmc_write(pmc, AT91_PMC_PCR, tmp | AT91_PMC_PCR_DIV(periph->div) + | AT91_PMC_PCR_CMD + | AT91_PMC_PCR_EN); + pmc_unlock(pmc); return 0; } @@ -176,12 +180,16 @@ static void clk_sam9x5_peripheral_disable(struct clk_hw *hw) { struct clk_sam9x5_peripheral *periph = to_clk_sam9x5_peripheral(hw); struct at91_pmc *pmc = periph->pmc; + u32 tmp; if (periph->id < PERIPHERAL_ID_MIN) return; - pmc_write(pmc, AT91_PMC_PCR, (periph->id & AT91_PMC_PCR_PID_MASK) | - AT91_PMC_PCR_CMD); + pmc_lock(pmc); + pmc_write(pmc, AT91_PMC_PCR, (periph->id & AT91_PMC_PCR_PID_MASK)); + tmp = pmc_read(pmc, AT91_PMC_PCR) & ~AT91_PMC_PCR_EN; + pmc_write(pmc, AT91_PMC_PCR, tmp | AT91_PMC_PCR_CMD); + pmc_unlock(pmc); } static int clk_sam9x5_peripheral_is_enabled(struct clk_hw *hw) |