[PATCH v2 3/3] mtd: gpmi: change the code for clocks
Huang Shijie
shijie8 at gmail.com
Sun Jul 1 23:24:36 EDT 2012
From: Huang Shijie <b32955 at freescale.com>
The gpmi nand driver may needs several clocks(MX6Q needs five clocks).
In the old clock framework, all these clocks are chained together,
all you need is to manipulate the first clock.
But the kernel uses the common clk framework now, which forces us to
get the clocks one by one. When we use them, we have to enable them
one by one too.
Signed-off-by: Huang Shijie <shijie8 at gmail.com>
---
drivers/mtd/nand/gpmi-nand/gpmi-lib.c | 43 ++++++++++++++---
drivers/mtd/nand/gpmi-nand/gpmi-nand.c | 82 ++++++++++++++++++++++++++++----
drivers/mtd/nand/gpmi-nand/gpmi-nand.h | 3 +-
3 files changed, 110 insertions(+), 18 deletions(-)
diff --git a/drivers/mtd/nand/gpmi-nand/gpmi-lib.c b/drivers/mtd/nand/gpmi-nand/gpmi-lib.c
index a1f4332..c3778c0 100644
--- a/drivers/mtd/nand/gpmi-nand/gpmi-lib.c
+++ b/drivers/mtd/nand/gpmi-nand/gpmi-lib.c
@@ -124,12 +124,40 @@ error:
return -ETIMEDOUT;
}
+static int __gpmi_enable_clk(struct gpmi_nand_data *this, bool v)
+{
+ struct clk *clk;
+ int ret;
+ int i;
+
+ for (i = 0; i < GPMI_CLK_MAX; i++) {
+ clk = this->resources.clock[i];
+ if (!clk)
+ break;
+
+ if (v) {
+ ret = clk_prepare_enable(clk);
+ if (ret)
+ goto err_clk;
+ } else {
+ clk_disable_unprepare(clk);
+ }
+ }
+ return 0;
+
+err_clk:
+ return ret;
+}
+
+#define gpmi_enable_clk(x) __gpmi_enable_clk(x, true)
+#define gpmi_disable_clk(x) __gpmi_enable_clk(x, false)
+
int gpmi_init(struct gpmi_nand_data *this)
{
struct resources *r = &this->resources;
int ret;
- ret = clk_prepare_enable(r->clock);
+ ret = gpmi_enable_clk(this);
if (ret)
goto err_out;
ret = gpmi_reset_block(r->gpmi_regs, false);
@@ -149,7 +177,7 @@ int gpmi_init(struct gpmi_nand_data *this)
/* Select BCH ECC. */
writel(BM_GPMI_CTRL1_BCH_MODE, r->gpmi_regs + HW_GPMI_CTRL1_SET);
- clk_disable_unprepare(r->clock);
+ gpmi_disable_clk(this);
return 0;
err_out:
return ret;
@@ -205,7 +233,7 @@ int bch_set_geometry(struct gpmi_nand_data *this)
ecc_strength = bch_geo->ecc_strength >> 1;
page_size = bch_geo->page_size;
- ret = clk_prepare_enable(r->clock);
+ ret = gpmi_enable_clk(this);
if (ret)
goto err_out;
@@ -240,7 +268,7 @@ int bch_set_geometry(struct gpmi_nand_data *this)
writel(BM_BCH_CTRL_COMPLETE_IRQ_EN,
r->bch_regs + HW_BCH_CTRL_SET);
- clk_disable_unprepare(r->clock);
+ gpmi_disable_clk(this);
return 0;
err_out:
return ret;
@@ -716,7 +744,7 @@ void gpmi_begin(struct gpmi_nand_data *this)
int ret;
/* Enable the clock. */
- ret = clk_prepare_enable(r->clock);
+ ret = gpmi_enable_clk(this);
if (ret) {
pr_err("We failed in enable the clk\n");
goto err_out;
@@ -727,7 +755,7 @@ void gpmi_begin(struct gpmi_nand_data *this)
gpmi_regs + HW_GPMI_TIMING1);
/* Get the timing information we need. */
- nfc->clock_frequency_in_hz = clk_get_rate(r->clock);
+ nfc->clock_frequency_in_hz = clk_get_rate(r->clock[0]);
clock_period_in_ns = 1000000000 / nfc->clock_frequency_in_hz;
gpmi_nfc_compute_hardware_timing(this, &hw);
@@ -784,8 +812,7 @@ err_out:
void gpmi_end(struct gpmi_nand_data *this)
{
- struct resources *r = &this->resources;
- clk_disable_unprepare(r->clock);
+ gpmi_disable_clk(this);
}
/* Clears a BCH interrupt. */
diff --git a/drivers/mtd/nand/gpmi-nand/gpmi-nand.c b/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
index 941cfb7..e7f362c 100644
--- a/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
+++ b/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
@@ -464,9 +464,78 @@ acquire_err:
return -EINVAL;
}
+static void gpmi_put_clks(struct gpmi_nand_data *this)
+{
+ struct resources *r = &this->resources;
+ struct clk *clk;
+ int i;
+
+ for (i = 0; i < GPMI_CLK_MAX; i++) {
+ clk = r->clock[i];
+ if (clk) {
+ clk_put(clk);
+ r->clock[i] = NULL;
+ }
+ }
+}
+
+static char *extra_clks_for_mx6q[GPMI_CLK_MAX] = {
+ "gpmi_apb", "gpmi_bch", "gpmi_bch_apb", "per1_bch",
+};
+
+static int __devinit gpmi_get_clks(struct gpmi_nand_data *this)
+{
+ struct resources *r = &this->resources;
+ char **extra_clks = NULL;
+ struct clk *clk;
+ int i;
+
+ /* The main clock is stored in the first. */
+ r->clock[0] = clk_get(this->dev, NULL);
+ if (IS_ERR(r->clock[0]))
+ goto err_clock;
+
+ /* Get extra clocks */
+ if (GPMI_IS_MX6Q(this))
+ extra_clks = extra_clks_for_mx6q;
+ if (!extra_clks)
+ return 0;
+
+ for (i = 1; i < GPMI_CLK_MAX; i++) {
+ if (extra_clks[i - 1] == NULL)
+ break;
+
+ clk = clk_get(this->dev, extra_clks[i - 1]);
+ if (IS_ERR(clk))
+ goto err_clock;
+
+ r->clock[i] = clk;
+ }
+
+ if (GPMI_IS_MX6Q(this)) {
+ /*
+ * Set the default values for the clocks in mx6q:
+ * The main clock(enfc) : 22MHz
+ * The others : 44.5MHz
+ *
+ * These are just the default values. If you want to use
+ * the ONFI nand which is in the Synchronous Mode, you should
+ * change the clocks's frequencies as you need.
+ */
+ clk_set_rate(r->clock[0], 22000000);
+ for (i = 1; i < GPMI_CLK_MAX; i++)
+ clk_set_rate(r->clock[0], 44500000);
+ }
+ return 0;
+
+err_clock:
+ dev_dbg(this->dev, "failed in finding the clocks.\n");
+ gpmi_put_clks(this);
+ return -ENOMEM;
+}
+
static int __devinit acquire_resources(struct gpmi_nand_data *this)
{
- struct resources *res = &this->resources;
struct pinctrl *pinctrl;
int ret;
@@ -492,12 +561,9 @@ static int __devinit acquire_resources(struct gpmi_nand_data *this)
goto exit_pin;
}
- res->clock = clk_get(&this->pdev->dev, NULL);
- if (IS_ERR(res->clock)) {
- pr_err("can not get the clock\n");
- ret = -ENOENT;
+ ret = gpmi_get_clks(this);
+ if (ret)
goto exit_clock;
- }
return 0;
exit_clock:
@@ -512,9 +578,7 @@ exit_regs:
static void release_resources(struct gpmi_nand_data *this)
{
- struct resources *r = &this->resources;
-
- clk_put(r->clock);
+ gpmi_put_clks(this);
release_register_block(this);
release_bch_irq(this);
release_dma_channels(this);
diff --git a/drivers/mtd/nand/gpmi-nand/gpmi-nand.h b/drivers/mtd/nand/gpmi-nand/gpmi-nand.h
index ce5daa1..1547a60 100644
--- a/drivers/mtd/nand/gpmi-nand/gpmi-nand.h
+++ b/drivers/mtd/nand/gpmi-nand/gpmi-nand.h
@@ -22,6 +22,7 @@
#include <linux/dma-mapping.h>
#include <linux/fsl/mxs-dma.h>
+#define GPMI_CLK_MAX 5 /* MX6Q needs five clocks */
struct resources {
void *gpmi_regs;
void *bch_regs;
@@ -29,7 +30,7 @@ struct resources {
unsigned int bch_high_interrupt;
unsigned int dma_low_channel;
unsigned int dma_high_channel;
- struct clk *clock;
+ struct clk *clock[GPMI_CLK_MAX];
};
/**
--
1.7.4.4
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