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authorManuel Lauss <manuel.lauss@gmail.com>2014-07-23 16:36:52 +0200
committerRalf Baechle <ralf@linux-mips.org>2014-07-30 14:10:00 +0200
commit415e0fec7a388dbe224057c1134737e23710aa9b (patch)
tree64ba643ffd45da5c4503ce32d553060c52e51f39 /arch/mips/alchemy/devboards/db1200.c
parent8e21170581d99038c41c803af289e1a6491cb145 (diff)
MIPS: Alchemy: db1x00: use clk framework
Make use of the clk framework to set up and enable all PSC clocks. Signed-off-by: Manuel Lauss <manuel.lauss@gmail.com> Cc: Linux-MIPS <linux-mips@linux-mips.org> Patchwork: https://patchwork.linux-mips.org/patch/7469/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/alchemy/devboards/db1200.c')
-rw-r--r--arch/mips/alchemy/devboards/db1200.c50
1 files changed, 25 insertions, 25 deletions
diff --git a/arch/mips/alchemy/devboards/db1200.c b/arch/mips/alchemy/devboards/db1200.c
index 5ccfd8393cd5..776188908dfc 100644
--- a/arch/mips/alchemy/devboards/db1200.c
+++ b/arch/mips/alchemy/devboards/db1200.c
@@ -18,6 +18,7 @@
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
+#include <linux/clk.h>
#include <linux/dma-mapping.h>
#include <linux/gpio.h>
#include <linux/i2c.h>
@@ -129,7 +130,6 @@ static int __init db1200_detect_board(void)
int __init db1200_board_setup(void)
{
- unsigned long freq0, clksrc, div, pfc;
unsigned short whoami;
if (db1200_detect_board())
@@ -149,30 +149,6 @@ int __init db1200_board_setup(void)
" Board-ID %d Daughtercard ID %d\n", get_system_type(),
(whoami >> 4) & 0xf, (whoami >> 8) & 0xf, whoami & 0xf);
- /* SMBus/SPI on PSC0, Audio on PSC1 */
- pfc = alchemy_rdsys(AU1000_SYS_PINFUNC);
- pfc &= ~(SYS_PINFUNC_P0A | SYS_PINFUNC_P0B);
- pfc &= ~(SYS_PINFUNC_P1A | SYS_PINFUNC_P1B | SYS_PINFUNC_FS3);
- pfc |= SYS_PINFUNC_P1C; /* SPI is configured later */
- alchemy_wrsys(pfc, AU1000_SYS_PINFUNC);
-
- /* Clock configurations: PSC0: ~50MHz via Clkgen0, derived from
- * CPU clock; all other clock generators off/unused.
- */
- div = (get_au1x00_speed() + 25000000) / 50000000;
- if (div & 1)
- div++;
- div = ((div >> 1) - 1) & 0xff;
-
- freq0 = div << SYS_FC_FRDIV0_BIT;
- alchemy_wrsys(freq0, AU1000_SYS_FREQCTRL0);
- freq0 |= SYS_FC_FE0; /* enable F0 */
- alchemy_wrsys(freq0, AU1000_SYS_FREQCTRL0);
-
- /* psc0_intclk comes 1:1 from F0 */
- clksrc = SYS_CS_MUX_FQ0 << SYS_CS_ME0_BIT;
- alchemy_wrsys(clksrc, AU1000_SYS_CLKSRC);
-
return 0;
}
@@ -843,6 +819,7 @@ int __init db1200_dev_setup(void)
unsigned long pfc;
unsigned short sw;
int swapped, bid;
+ struct clk *c;
bid = BCSR_WHOAMI_BOARD(bcsr_read(BCSR_WHOAMI));
if ((bid == BCSR_WHOAMI_PB1200_DDR1) ||
@@ -855,6 +832,24 @@ int __init db1200_dev_setup(void)
irq_set_irq_type(AU1200_GPIO7_INT, IRQ_TYPE_LEVEL_LOW);
bcsr_init_irq(DB1200_INT_BEGIN, DB1200_INT_END, AU1200_GPIO7_INT);
+ /* SMBus/SPI on PSC0, Audio on PSC1 */
+ pfc = alchemy_rdsys(AU1000_SYS_PINFUNC);
+ pfc &= ~(SYS_PINFUNC_P0A | SYS_PINFUNC_P0B);
+ pfc &= ~(SYS_PINFUNC_P1A | SYS_PINFUNC_P1B | SYS_PINFUNC_FS3);
+ pfc |= SYS_PINFUNC_P1C; /* SPI is configured later */
+ alchemy_wrsys(pfc, AU1000_SYS_PINFUNC);
+
+ /* get 50MHz for I2C driver on PSC0 */
+ c = clk_get(NULL, "psc0_intclk");
+ if (!IS_ERR(c)) {
+ pfc = clk_round_rate(c, 50000000);
+ if ((pfc < 1) || (abs(50000000 - pfc) > 2500000))
+ pr_warn("DB1200: cant get I2C close to 50MHz\n");
+ else
+ clk_set_rate(c, pfc);
+ clk_put(c);
+ }
+
/* insert/eject pairs: one of both is always screaming. To avoid
* issues they must not be automatically enabled when initially
* requested.
@@ -927,6 +922,11 @@ int __init db1200_dev_setup(void)
}
/* Audio PSC clock is supplied externally. (FIXME: platdata!!) */
+ c = clk_get(NULL, "psc1_intclk");
+ if (!IS_ERR(c)) {
+ clk_prepare_enable(c);
+ clk_put(c);
+ }
__raw_writel(PSC_SEL_CLK_SERCLK,
(void __iomem *)KSEG1ADDR(AU1550_PSC1_PHYS_ADDR) + PSC_SEL_OFFSET);
wmb();