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Date: Tue, 28 Jul 2009 09:51:07 +0200 (CEST)
From: Guennadi Liakhovetski <g.liakhovetski@....de>
To: Ian Molton <ian@...menth.co.uk>
cc: linux-kernel@...r.kernel.org, Magnus Damm <damm@...nsource.se>,
akpm@...ux-foundation.org, Matt Fleming <matt@...sole-pimps.org>,
Philip Langdale <philipl@...rt.org>
Subject: [PATCH] tmio_mmc: Optionally support using platform clock
If the platform device has a clock associated with the tmio-mmc device,
use it.
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@....de>
Cc: Magnus Damm <damm@...nsource.se>
---
Depends (at least logically) on
http://marc.info/?l=linux-kernel&m=124782904228865&w=2
Sorry if I forgot anyone who volunteered to help out with MMC patches.
drivers/mmc/host/tmio_mmc.c | 21 +++++++++++++++++++++
drivers/mmc/host/tmio_mmc.h | 3 +++
include/linux/mfd/tmio.h | 1 +
3 files changed, 25 insertions(+), 0 deletions(-)
diff --git a/drivers/mmc/host/tmio_mmc.c b/drivers/mmc/host/tmio_mmc.c
index c246191..2a01572 100644
--- a/drivers/mmc/host/tmio_mmc.c
+++ b/drivers/mmc/host/tmio_mmc.c
@@ -32,6 +32,7 @@
#include <linux/mmc/host.h>
#include <linux/mfd/core.h>
#include <linux/mfd/tmio.h>
+#include <linux/clk.h>
#include "tmio_mmc.h"
@@ -57,10 +58,18 @@ static void tmio_mmc_clk_stop(struct tmio_mmc_host *host)
sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, ~0x0100 &
sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
msleep(10);
+ if (!IS_ERR(host->clk) && host->clk_is_running) {
+ clk_disable(host->clk);
+ host->clk_is_running = false;
+ }
}
static void tmio_mmc_clk_start(struct tmio_mmc_host *host)
{
+ if (!IS_ERR(host->clk) && !host->clk_is_running &&
+ !clk_enable(host->clk))
+ host->clk_is_running = true;
+
sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, 0x0100 |
sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
msleep(10);
@@ -567,6 +576,11 @@ static int __devinit tmio_mmc_probe(struct platform_device *dev)
goto unmap_cnf;
}
+ host->clk = clk_get(&dev->dev, pdata->clk_name);
+
+ if (!IS_ERR(host->clk) && !clk_enable(host->clk))
+ host->clk_is_running = true;
+
/* Enable the MMC/SD Control registers */
sd_config_write16(host, CNF_CMD, SDCREN);
sd_config_write32(host, CNF_CTL_BASE,
@@ -608,6 +622,11 @@ static int __devinit tmio_mmc_probe(struct platform_device *dev)
return 0;
unmap_cnf:
+ if (!IS_ERR(host->clk)) {
+ clk_disable(host->clk);
+ host->clk_is_running = false;
+ clk_put(host->clk);
+ }
if (host->cnf)
iounmap(host->cnf);
unmap_ctl:
@@ -632,6 +651,8 @@ static int __devexit tmio_mmc_remove(struct platform_device *dev)
if (host->cnf)
iounmap(host->cnf);
mmc_free_host(mmc);
+ if (!IS_ERR(host->clk))
+ clk_put(host->clk);
}
return 0;
diff --git a/drivers/mmc/host/tmio_mmc.h b/drivers/mmc/host/tmio_mmc.h
index 45f06aa..a76d237 100644
--- a/drivers/mmc/host/tmio_mmc.h
+++ b/drivers/mmc/host/tmio_mmc.h
@@ -108,6 +108,7 @@
sd_ctrl_write32((host), CTL_STATUS, mask); \
} while (0)
+struct clk;
struct tmio_mmc_host {
void __iomem *cnf;
@@ -117,6 +118,8 @@ struct tmio_mmc_host {
struct mmc_request *mrq;
struct mmc_data *data;
struct mmc_host *mmc;
+ struct clk *clk;
+ bool clk_is_running;
int irq;
/* pio related stuff */
diff --git a/include/linux/mfd/tmio.h b/include/linux/mfd/tmio.h
index 6b9c5d0..e405895 100644
--- a/include/linux/mfd/tmio.h
+++ b/include/linux/mfd/tmio.h
@@ -23,6 +23,7 @@
*/
struct tmio_mmc_data {
const unsigned int hclk;
+ const char *clk_name;
};
/*
--
1.6.2.4
--
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