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Date: Thu, 3 Jul 2014 15:22:37 +0200
From: Manuel Lauss <manuel.lauss@...il.com>
To: Linux-MIPS <linux-mips@...ux-mips.org>,
Mike Turquette <mturquette@...aro.org>
Cc: linux-kernel@...r.kernel.org, Manuel Lauss <manuel.lauss@...il.com>
Subject: [RFC PATCH v2 06/11] MIPS: Alchemy: db1200: use clk framework
Make use of the clk framework to give us a rate as close to 50MHz
as possible.
Signed-off-by: Manuel Lauss <manuel.lauss@...il.com>
---
arch/mips/alchemy/devboards/db1200.c | 45 ++++++++++++++++--------------------
1 file changed, 20 insertions(+), 25 deletions(-)
diff --git a/arch/mips/alchemy/devboards/db1200.c b/arch/mips/alchemy/devboards/db1200.c
index 8c71cde..f255586 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 = AU1X_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 */
- AU1X_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;
- AU1X_WRSYS(freq0, AU1000_SYS_FREQCTRL0);
- freq0 |= SYS_FC_FE0; /* enable F0 */
- AU1X_WRSYS(freq0, AU1000_SYS_FREQCTRL0);
-
- /* psc0_intclk comes 1:1 from F0 */
- clksrc = SYS_CS_MUX_FQ0 << SYS_CS_ME0_BIT;
- AU1X_WRSYS(clksrc, AU1000_SYS_CLKSRC);
-
return 0;
}
@@ -845,6 +821,7 @@ 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) ||
@@ -857,6 +834,24 @@ 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 = AU1X_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 */
+ AU1X_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.
--
2.0.0
--
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