[PATCH 11/15] bus: omap_l3_noc: use of_match_data to pick up SoC information

Nishanth Menon
2014-04-14T16:25:22Z

From: Sricharan R <r.sricharan@ti.com>

DRA7xx SoC has the same l3-noc interconnect ip (as OMAP4 and OMAP5), but
AM437x SoC has just 2 modules instead of 3 which other SoCs have.

So, stop using direct access of array indices and use of->match data and
simplify implementation to benefit future usage.

While at it, rename a few very generic variables to make them omap
specific. This helps us differentiate from DRA7 and AM43xx data in the
future.

NOTE: None of the platforms that use omap_l3_noc are non-device tree
anymore. So, it is safe to assume OF match here.

Signed-off-by: Sricharan R <r.sricharan@ti.com>
Signed-off-by: Rajendra Nayak <rnayak@ti.com>
[nm at ti.com: split, refactor and optimize logic]
Signed-off-by: Nishanth Menon <nm@ti.com>
---
drivers/bus/omap_l3_noc.c | 50 +++++++++++++++++--------------
drivers/bus/omap_l3_noc.h | 72 ++++++++++++++++++++++++++++++++-------------
2 files changed, 80 insertions(+), 42 deletions(-)

diff --git a/drivers/bus/omap_l3_noc.c b/drivers/bus/omap_l3_noc.c
index 6848822..3819b2f 100644
--- a/drivers/bus/omap_l3_noc.c
+++ b/drivers/bus/omap_l3_noc.c
@@ -14,12 +14,14 @@
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
-#include <linux/module.h>
#include <linux/init.h>
-#include <linux/io.h>
-#include <linux/platform_device.h>
#include <linux/interrupt.h>
+#include <linux/io.h>
#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
#include <linux/slab.h>

#include "omap_l3_noc.h"
@@ -64,13 +66,13 @@ static irqreturn_t l3_interrupt_handler(int irq, void *_l3)
/* Get the Type of interrupt */
inttype = irq == l3->app_irq ? L3_APPLICATION_ERROR : L3_DEBUG_ERROR;

- for (i = 0; i < L3_MODULES; i++) {
+ for (i = 0; i < l3->num_modules; i++) {
/*
* Read the regerr register of the clock domain
* to determine the source
*/
base = l3->l3_base[i];
- err_reg = readl_relaxed(base + l3_flagmux[i] +
+ err_reg = readl_relaxed(base + l3->l3_flagmux[i] +
L3_FLAGMUX_REGERR0 + (inttype << 3));

/* Get the corresponding error and analyse */
@@ -83,7 +85,7 @@ static irqreturn_t l3_interrupt_handler(int irq, void *_l3)
/* We DONOT expect err_src to go out of bounds */
BUG_ON(err_src >= MAX_CLKDM_TARGETS);

- l3_targ_inst = &l3_targ[i][err_src];
+ l3_targ_inst = &l3->l3_targ[i][err_src];
target_name = l3_targ_inst->name;
l3_targ_base = base + l3_targ_inst->offset;

@@ -105,7 +107,7 @@ static irqreturn_t l3_interrupt_handler(int irq, void *_l3)
inttype ? "debug" : "application",
err_src, i, "(unclearable)");

- mask_reg = base + l3_flagmux[i] +
+ mask_reg = base + l3->l3_flagmux[i] +
L3_FLAGMUX_MASK0 + (inttype << 3);
mask_val = readl(mask_reg);
mask_val &= ~(1 << err_src);
@@ -124,9 +126,9 @@ static irqreturn_t l3_interrupt_handler(int irq, void *_l3)
std_err_main = readl_relaxed(l3_targ_stderr);
masterid = readl_relaxed(l3_targ_mstaddr);

- for (k = 0; k < NUM_OF_L3_MASTERS; k++) {
- if (masterid == l3_masters[k].id)
- master_name = l3_masters[k].name;
+ for (k = 0; k < l3->num_masters; k++) {
+ if (masterid == l3->l3_masters[k].id)
+ master_name = l3->l3_masters[k].name;
}

switch (std_err_main & CUSTOM_ERROR) {
@@ -166,20 +168,34 @@ static irqreturn_t l3_interrupt_handler(int irq, void *_l3)
return IRQ_HANDLED;
}

+static const struct of_device_id l3_noc_match[] = {
+ {.compatible = "ti,omap4-l3-noc", .data = &omap_l3_data},
+ {},
+};
+MODULE_DEVICE_TABLE(of, l3_noc_match);
+
static int omap_l3_probe(struct platform_device *pdev)
{
+ const struct of_device_id *of_id;
static struct omap_l3 *l3;
int ret, i;

+ of_id = of_match_device(l3_noc_match, &pdev->dev);
+ if (!of_id) {
+ dev_err(&pdev->dev, "OF data missing\n");
+ return -EINVAL;
+ }
+
l3 = devm_kzalloc(&pdev->dev, sizeof(*l3), GFP_KERNEL);
if (!l3)
return -ENOMEM;

+ memcpy(l3, of_id->data, sizeof(*l3));
l3->dev = &pdev->dev;
platform_set_drvdata(pdev, l3);

/* Get mem resources */
- for (i = 0; i < L3_MODULES; i++) {
+ for (i = 0; i < l3->num_modules; i++) {
struct resource *res = platform_get_resource(pdev,
IORESOURCE_MEM, i);

@@ -211,22 +227,12 @@ static int omap_l3_probe(struct platform_device *pdev)
return ret;
}

-#if defined(CONFIG_OF)
-static const struct of_device_id l3_noc_match[] = {
- {.compatible = "ti,omap4-l3-noc", },
- {},
-};
-MODULE_DEVICE_TABLE(of, l3_noc_match);
-#else
-#define l3_noc_match NULL
-#endif
-
static struct platform_driver omap_l3_driver = {
.probe = omap_l3_probe,
.driver = {
.name = "omap_l3_noc",
.owner = THIS_MODULE,
- .of_match_table = l3_noc_match,
+ .of_match_table = of_match_ptr(l3_noc_match),
},
};

diff --git a/drivers/bus/omap_l3_noc.h b/drivers/bus/omap_l3_noc.h
index 573e40f..a546870 100644
--- a/drivers/bus/omap_l3_noc.h
+++ b/drivers/bus/omap_l3_noc.h
@@ -17,7 +17,9 @@
#ifndef __OMAP_L3_NOC_H
#define __OMAP_L3_NOC_H

-#define L3_MODULES 3
+#define OMAP_L3_MODULES 3
+#define MAX_L3_MODULES 3
+
#define CLEAR_STDERR_LOG (1 << 31)
#define CUSTOM_ERROR 0x2
#define STANDARD_ERROR 0x0
@@ -36,8 +38,6 @@

#define MAX_CLKDM_TARGETS 30

-#define NUM_OF_L3_MASTERS (sizeof(l3_masters)/sizeof(l3_masters[0]))
-
/**
* struct l3_masters_data - L3 Master information
* @id: ID of the L3 Master
@@ -60,13 +60,47 @@ struct l3_target_data {
char *name;
};

-static u32 l3_flagmux[L3_MODULES] = {
+
+/**
+ * struct omap_l3 - Description of data relevant for L3 bus.
+ * @dev: device representing the bus (populated runtime)
+ * @l3_base: base addresses of modules (populated runtime)
+ * @l3_flag_mux: array containing offsets to flag mux per module
+ * offset from corresponding module base indexed per
+ * module.
+ * @num_modules: number of clock domains / modules.
+ * @l3_masters: array pointing to master data containing name and register
+ * offset for the master.
+ * @num_master: number of masters
+ * @l3_targ: array indexed by flagmux index (bit offset) pointing to the
+ * target data. unsupported ones are marked with
+ * L3_TARGET_NOT_SUPPORTED
+ * @debug_irq: irq number of the debug interrupt (populated runtime)
+ * @app_irq: irq number of the application interrupt (populated runtime)
+ */
+struct omap_l3 {
+ struct device *dev;
+
+ void __iomem *l3_base[MAX_L3_MODULES];
+ u32 *l3_flagmux;
+ int num_modules;
+
+ struct l3_masters_data *l3_masters;
+ int num_masters;
+
+ struct l3_target_data **l3_targ;
+
+ int debug_irq;
+ int app_irq;
+};
+
+static u32 omap_l3_flagmux[OMAP_L3_MODULES] = {
0x500,
0x1000,
0X0200
};

-static struct l3_target_data l3_target_inst_data_clk1[MAX_CLKDM_TARGETS] = {
+static struct l3_target_data omap_l3_target_data_clk1[MAX_CLKDM_TARGETS] = {
{0x100, "DMM1",},
{0x200, "DMM2",},
{0x300, "ABE",},
@@ -76,7 +110,7 @@ static struct l3_target_data l3_target_inst_data_clk1[MAX_CLKDM_TARGETS] = {
{0x900, "L4WAKEUP",},
};

-static struct l3_target_data l3_target_inst_data_clk2[MAX_CLKDM_TARGETS] = {
+static struct l3_target_data omap_l3_target_data_clk2[MAX_CLKDM_TARGETS] = {
{0x500, "CORTEXM3",},
{0x300, "DSS",},
{0x100, "GPMC",},
@@ -100,13 +134,13 @@ static struct l3_target_data l3_target_inst_data_clk2[MAX_CLKDM_TARGETS] = {
{0x1700, "LLI",},
};

-static struct l3_target_data l3_target_inst_data_clk3[MAX_CLKDM_TARGETS] = {
+static struct l3_target_data omap_l3_target_data_clk3[MAX_CLKDM_TARGETS] = {
{0x0100, "EMUSS",},
{0x0300, "DEBUG SOURCE",},
{0x0, "HOST CLK3",},
};

-static struct l3_masters_data l3_masters[] = {
+static struct l3_masters_data omap_l3_masters[] = {
{ 0x0 , "MPU"},
{ 0x10, "CS_ADP"},
{ 0x14, "xxx"},
@@ -134,20 +168,18 @@ static struct l3_masters_data l3_masters[] = {
{ 0xC8, "USBHOSTFS"}
};

-static struct l3_target_data *l3_targ[L3_MODULES] = {
- l3_target_inst_data_clk1,
- l3_target_inst_data_clk2,
- l3_target_inst_data_clk3,
+static struct l3_target_data *omap_l3_targ[OMAP_L3_MODULES] = {
+ omap_l3_target_data_clk1,
+ omap_l3_target_data_clk2,
+ omap_l3_target_data_clk3,
};

-struct omap_l3 {
- struct device *dev;
-
- /* memory base */
- void __iomem *l3_base[L3_MODULES];
-
- int debug_irq;
- int app_irq;
+static const struct omap_l3 omap_l3_data = {
+ .l3_flagmux = omap_l3_flagmux,
+ .num_modules = OMAP_L3_MODULES,
+ .l3_masters = omap_l3_masters,
+ .num_masters = ARRAY_SIZE(omap_l3_masters),
+ .l3_targ = omap_l3_targ,
};

#endif /* __OMAP_L3_NOC_H */
--
1.7.9.5