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Subject[RFC PATCH v2 07/11] MIPS: Alchemy: irda: use clk framework
Date
Test the existence of the irda_clk clock object, use it to en/dis-
able it when date is being transferred.

Signed-off-by: Manuel Lauss <manuel.lauss@gmail.com>
---
drivers/net/irda/au1k_ir.c | 48 ++++++++++++++++++++++++++++++++++++++++++++--
1 file changed, 46 insertions(+), 2 deletions(-)

diff --git a/drivers/net/irda/au1k_ir.c b/drivers/net/irda/au1k_ir.c
index 5f91e3e..aab2cf7 100644
--- a/drivers/net/irda/au1k_ir.c
+++ b/drivers/net/irda/au1k_ir.c
@@ -18,6 +18,7 @@
* with this program; if not, see <http://www.gnu.org/licenses/>.
*/

+#include <linux/clk.h>
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/interrupt.h>
@@ -175,6 +176,7 @@ struct au1k_private {

struct resource *ioarea;
struct au1k_irda_platform_data *platdata;
+ struct clk *irda_clk;
};

static int qos_mtt_bits = 0x07; /* 1 ms or more */
@@ -514,9 +516,39 @@ static irqreturn_t au1k_irda_interrupt(int dummy, void *dev_id)
static int au1k_init(struct net_device *dev)
{
struct au1k_private *aup = netdev_priv(dev);
- u32 enable, ring_address;
+ u32 enable, ring_address, phyck;
+ struct clk *c;
int i;

+ c = clk_get(NULL, "irda_clk");
+ if (IS_ERR(c))
+ return PTR_ERR(c);
+ i = clk_prepare_enable(c);
+ if (i) {
+ clk_put(c);
+ return i;
+ }
+
+ switch (clk_get_rate(c)) {
+ case 40000000:
+ phyck = IR_PHYCLK_40MHZ;
+ break;
+ case 48000000:
+ phyck = IR_PHYCLK_48MHZ;
+ break;
+ case 56000000:
+ phyck = IR_PHYCLK_56MHZ;
+ break;
+ case 64000000:
+ phyck = IR_PHYCLK_64MHZ;
+ break;
+ default:
+ clk_disable_unprepare(c);
+ clk_put(c);
+ return -EINVAL;
+ }
+ aup->irda_clk = c;
+
enable = IR_HC | IR_CE | IR_C;
#ifndef CONFIG_CPU_LITTLE_ENDIAN
enable |= IR_BE;
@@ -545,7 +577,7 @@ static int au1k_init(struct net_device *dev)
irda_write(aup, IR_RING_SIZE,
(RING_SIZE_64 << 8) | (RING_SIZE_64 << 12));

- irda_write(aup, IR_CONFIG_2, IR_PHYCLK_48MHZ | IR_ONE_PIN);
+ irda_write(aup, IR_CONFIG_2, phyck | IR_ONE_PIN);
irda_write(aup, IR_RING_ADDR_CMPR, 0);

au1k_irda_set_speed(dev, 9600);
@@ -619,6 +651,9 @@ static int au1k_irda_stop(struct net_device *dev)
free_irq(aup->irq_tx, dev);
free_irq(aup->irq_rx, dev);

+ clk_disable_unprepare(aup->irda_clk);
+ clk_put(aup->irda_clk);
+
return 0;
}

@@ -853,6 +888,7 @@ static int au1k_irda_probe(struct platform_device *pdev)
struct au1k_private *aup;
struct net_device *dev;
struct resource *r;
+ struct clk *c;
int err;

dev = alloc_irdadev(sizeof(struct au1k_private));
@@ -886,6 +922,14 @@ static int au1k_irda_probe(struct platform_device *pdev)
if (!aup->ioarea)
goto out;

+ /* bail out early if clock doesn't exist */
+ c = clk_get(NULL, "irda_clk");
+ if (IS_ERR(c)) {
+ err = PTR_ERR(c);
+ goto out;
+ }
+ clk_put(c);
+
aup->iobase = ioremap_nocache(r->start, resource_size(r));
if (!aup->iobase)
goto out2;
--
2.0.0


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