[PATCH 10/19] DSPBRIDGE: function to get the type of clock requested by dsp

Omar Ramirez Luna
2010-04-08T23:00:13Z

DSP can request between 4 types of clocks: GPT (5-8), WDT (3),
MCBSP (1-5) or SSI clock. This function will be useful in case
a specific clock framework is associated with the clock.

Signed-off-by: Omar Ramirez Luna <omar.ramirez@ti.com>
---
drivers/dsp/bridge/services/clk.c | 80 ++++++++++++++++++++++++++++---------
1 files changed, 61 insertions(+), 19 deletions(-)

diff --git a/drivers/dsp/bridge/services/clk.c b/drivers/dsp/bridge/services/clk.c
index babf043..6e76dd3 100644
--- a/drivers/dsp/bridge/services/clk.c
+++ b/drivers/dsp/bridge/services/clk.c
@@ -43,6 +43,12 @@
#define SSI_SIDLE_SMARTIDLE (2 << 3)
#define SSI_MIDLE_NOIDLE (1 << 12)

+/* Clk types requested by the dsp */
+#define GPT_CLK 0
+#define WDT_CLK 1
+#define MCBSP_CLK 2
+#define SSI_CLK 3
+
struct dsp_clk_t {
struct clk *clk_handle;
const char *clk_name;
@@ -78,6 +84,24 @@ static struct dsp_clk_t dsp_clks[] = {
{NULL, ""}
};

+static s8 get_clk_type(u8 id)
+{
+ s8 type;
+
+ if (id <= DSP_CLK_GPT8_ICK)
+ type = GPT_CLK;
+ else if (id <= DSP_CLK_WDT3_ICK)
+ type = WDT_CLK;
+ else if (id <= DSP_CLK_MCBSP5_ICK)
+ type = MCBSP_CLK;
+ else if (id < DSP_CLK_SSI_ICK)
+ type = SSI_CLK;
+ else
+ type = -1;
+
+ return type;
+}
+
/*
* ======== dsp_clk_exit ========
* Purpose:
@@ -143,23 +167,32 @@ dsp_status dsp_clk_enable(IN enum dsp_clk_id clk_id)
dsp_status status = DSP_SOK;
struct clk *clk_handle;

- DBC_REQUIRE(clk_id < DSP_CLK_NOT_DEFINED);
+ switch (get_clk_type(clk_id)) {
+ case GPT_CLK:
+ case MCBSP_CLK:
+ case WDT_CLK:
+ case SSI_CLK:
+ clk_handle = dsp_clks[clk_id].clk_handle;
+ if (clk_enable(clk_handle)) {
+ pr_err("dsp_clk_enable: failed to Enable CLK %s, "
+ "CLK dev id = %d\n", dsp_clks[clk_id].clk_name,
+ dsp_clks[clk_id].id);
+ status = DSP_EFAIL;
+ }

- clk_handle = dsp_clks[clk_id].clk_handle;
- if (clk_enable(clk_handle)) {
- pr_err("dsp_clk_enable: failed to Enable CLK %s, "
- "CLK dev id = %d\n",
- dsp_clks[clk_id].clk_name,
- dsp_clks[clk_id].id);
- status = DSP_EFAIL;
+ /*
+ * The SSI module need to configured not to have the Forced
+ * idle for master interface. If it is set to forced idle,
+ * the SSI module is transitioning to standby thereby causing
+ * the client in the DSP hang waiting for the SSI module to
+ * be active after enabling the clocks
+ */
+ if (clk_id == DSP_CLK_SSI_ICK)
+ ssi_clk_prepare(true);
+ break;
+ default:
+ dev_err(bridge, "Invalid clock id for enable\n");
}
- /* The SSI module need to configured not to have the Forced idle for
- * master interface. If it is set to forced idle, the SSI module is
- * transitioning to standby thereby causing the client in the DSP hang
- * waiting for the SSI module to be active after enabling the clocks
- */
- if (clk_id == DSP_CLK_SSI_FCK)
- ssi_clk_prepare(true);

return status;
}
@@ -177,12 +210,21 @@ dsp_status dsp_clk_disable(IN enum dsp_clk_id clk_id)

DBC_REQUIRE(clk_id < DSP_CLK_NOT_DEFINED);

- clk_handle = dsp_clks[clk_id].clk_handle;
+ switch (get_clk_type(clk_id)) {
+ case GPT_CLK:
+ case MCBSP_CLK:
+ case WDT_CLK:
+ case SSI_CLK:
+ clk_handle = dsp_clks[clk_id].clk_handle;

- if (clk_id == DSP_CLK_SSI_ICK)
- ssi_clk_prepare(false);
+ if (clk_id == DSP_CLK_SSI_ICK)
+ ssi_clk_prepare(false);

- clk_disable(clk_handle);
+ clk_disable(clk_handle);
+ break;
+ default:
+ dev_err(bridge, "Invalid clock id for disable\n");
+ }

return status;
}
--
1.6.2.4