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authorMark Brown <broonie@opensource.wolfsonmicro.com>2011-12-03 19:58:06 -0500
committerMark Brown <broonie@opensource.wolfsonmicro.com>2012-01-21 08:10:08 -0500
commitb97b662174162b44944abd0fa9faea50006ba711 (patch)
tree6097e95949df64f7504bff8f09c100a0cd33d2bd /drivers/spi/spi-s3c64xx.c
parente25d0bf917e8f3b6b5bafdc2fe666ca81eb9099d (diff)
spi/s3c64xx: Implement runtime PM support
Enable and disable the clocks to the SPI controller using runtime PM. This serves the dual purpose of reducing power consumption a little and letting the core know when the device is idle. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Acked-by: Linus Walleij <linus.walleij@linaro.org> Acked-by: Heiko Stuebner <heiko@sntech.de>
Diffstat (limited to 'drivers/spi/spi-s3c64xx.c')
-rw-r--r--drivers/spi/spi-s3c64xx.c39
1 files changed, 39 insertions, 0 deletions
diff --git a/drivers/spi/spi-s3c64xx.c b/drivers/spi/spi-s3c64xx.c
index 56dbdf15cba1..b0b843b321bb 100644
--- a/drivers/spi/spi-s3c64xx.c
+++ b/drivers/spi/spi-s3c64xx.c
@@ -25,6 +25,7 @@
25#include <linux/clk.h> 25#include <linux/clk.h>
26#include <linux/dma-mapping.h> 26#include <linux/dma-mapping.h>
27#include <linux/platform_device.h> 27#include <linux/platform_device.h>
28#include <linux/pm_runtime.h>
28#include <linux/spi/spi.h> 29#include <linux/spi/spi.h>
29 30
30#include <mach/dma.h> 31#include <mach/dma.h>
@@ -782,6 +783,8 @@ static void s3c64xx_spi_work(struct work_struct *work)
782 while (!acquire_dma(sdd)) 783 while (!acquire_dma(sdd))
783 msleep(10); 784 msleep(10);
784 785
786 pm_runtime_get_sync(&sdd->pdev->dev);
787
785 spin_lock_irqsave(&sdd->lock, flags); 788 spin_lock_irqsave(&sdd->lock, flags);
786 789
787 while (!list_empty(&sdd->queue) 790 while (!list_empty(&sdd->queue)
@@ -810,6 +813,8 @@ static void s3c64xx_spi_work(struct work_struct *work)
810 /* Free DMA channels */ 813 /* Free DMA channels */
811 sdd->ops->release(sdd->rx_dma.ch, &s3c64xx_spi_dma_client); 814 sdd->ops->release(sdd->rx_dma.ch, &s3c64xx_spi_dma_client);
812 sdd->ops->release(sdd->tx_dma.ch, &s3c64xx_spi_dma_client); 815 sdd->ops->release(sdd->tx_dma.ch, &s3c64xx_spi_dma_client);
816
817 pm_runtime_put(&sdd->pdev->dev);
813} 818}
814 819
815static int s3c64xx_spi_transfer(struct spi_device *spi, 820static int s3c64xx_spi_transfer(struct spi_device *spi,
@@ -892,6 +897,8 @@ static int s3c64xx_spi_setup(struct spi_device *spi)
892 goto setup_exit; 897 goto setup_exit;
893 } 898 }
894 899
900 pm_runtime_get_sync(&sdd->pdev->dev);
901
895 /* Check if we can provide the requested rate */ 902 /* Check if we can provide the requested rate */
896 if (!sci->clk_from_cmu) { 903 if (!sci->clk_from_cmu) {
897 u32 psr, speed; 904 u32 psr, speed;
@@ -924,6 +931,8 @@ static int s3c64xx_spi_setup(struct spi_device *spi)
924 err = -EINVAL; 931 err = -EINVAL;
925 } 932 }
926 933
934 pm_runtime_put(&sdd->pdev->dev);
935
927setup_exit: 936setup_exit:
928 937
929 /* setup() returns with device de-selected */ 938 /* setup() returns with device de-selected */
@@ -1164,6 +1173,8 @@ static int __init s3c64xx_spi_probe(struct platform_device *pdev)
1164 mem_res->end, mem_res->start, 1173 mem_res->end, mem_res->start,
1165 sdd->rx_dma.dmach, sdd->tx_dma.dmach); 1174 sdd->rx_dma.dmach, sdd->tx_dma.dmach);
1166 1175
1176 pm_runtime_enable(&pdev->dev);
1177
1167 return 0; 1178 return 0;
1168 1179
1169err9: 1180err9:
@@ -1197,6 +1208,8 @@ static int s3c64xx_spi_remove(struct platform_device *pdev)
1197 struct resource *mem_res; 1208 struct resource *mem_res;
1198 unsigned long flags; 1209 unsigned long flags;
1199 1210
1211 pm_runtime_disable(&pdev->dev);
1212
1200 spin_lock_irqsave(&sdd->lock, flags); 1213 spin_lock_irqsave(&sdd->lock, flags);
1201 sdd->state |= SUSPND; 1214 sdd->state |= SUSPND;
1202 spin_unlock_irqrestore(&sdd->lock, flags); 1215 spin_unlock_irqrestore(&sdd->lock, flags);
@@ -1277,8 +1290,34 @@ static int s3c64xx_spi_resume(struct device *dev)
1277} 1290}
1278#endif /* CONFIG_PM */ 1291#endif /* CONFIG_PM */
1279 1292
1293#ifdef CONFIG_PM_RUNTIME
1294static int s3c64xx_spi_runtime_suspend(struct device *dev)
1295{
1296 struct spi_master *master = spi_master_get(dev_get_drvdata(dev));
1297 struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master);
1298
1299 clk_disable(sdd->clk);
1300 clk_disable(sdd->src_clk);
1301
1302 return 0;
1303}
1304
1305static int s3c64xx_spi_runtime_resume(struct device *dev)
1306{
1307 struct spi_master *master = spi_master_get(dev_get_drvdata(dev));
1308 struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master);
1309
1310 clk_enable(sdd->src_clk);
1311 clk_enable(sdd->clk);
1312
1313 return 0;
1314}
1315#endif /* CONFIG_PM_RUNTIME */
1316
1280static const struct dev_pm_ops s3c64xx_spi_pm = { 1317static const struct dev_pm_ops s3c64xx_spi_pm = {
1281 SET_SYSTEM_SLEEP_PM_OPS(s3c64xx_spi_suspend, s3c64xx_spi_resume) 1318 SET_SYSTEM_SLEEP_PM_OPS(s3c64xx_spi_suspend, s3c64xx_spi_resume)
1319 SET_RUNTIME_PM_OPS(s3c64xx_spi_runtime_suspend,
1320 s3c64xx_spi_runtime_resume, NULL)
1282}; 1321};
1283 1322
1284static struct platform_driver s3c64xx_spi_driver = { 1323static struct platform_driver s3c64xx_spi_driver = {
generated by cgit v1.2.2 (git 2.25.0) at 2025-03-22 15:57:32 -0400