170 lines
4.8 KiB
Diff
170 lines
4.8 KiB
Diff
From 6bc6d433aaed4d4a5d5be44e70d9de865a850048 Mon Sep 17 00:00:00 2001
|
|
From: Martin Sperl <kernel@martin.sperl.org>
|
|
Date: Tue, 26 Apr 2016 14:59:21 +0000
|
|
Subject: [PATCH] MISC: bcm2835: smi: use clock manager and fix reload issues
|
|
|
|
Use clock manager instead of self-made clockmanager.
|
|
|
|
Also fix some error paths that showd up during development
|
|
(especially missing release of dma resources on rmmod)
|
|
|
|
Signed-off-by: Martin Sperl <kernel@martin.sperl.org>
|
|
---
|
|
drivers/misc/bcm2835_smi.c | 86 +++++++++++++++-------------------------------
|
|
1 file changed, 28 insertions(+), 58 deletions(-)
|
|
|
|
--- a/drivers/misc/bcm2835_smi.c
|
|
+++ b/drivers/misc/bcm2835_smi.c
|
|
@@ -34,6 +34,7 @@
|
|
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
+#include <linux/clk.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/of.h>
|
|
@@ -62,7 +63,7 @@
|
|
struct bcm2835_smi_instance {
|
|
struct device *dev;
|
|
struct smi_settings settings;
|
|
- __iomem void *smi_regs_ptr, *cm_smi_regs_ptr;
|
|
+ __iomem void *smi_regs_ptr;
|
|
dma_addr_t smi_regs_busaddr;
|
|
|
|
struct dma_chan *dma_chan;
|
|
@@ -72,8 +73,7 @@ struct bcm2835_smi_instance {
|
|
|
|
struct scatterlist buffer_sgl;
|
|
|
|
- int clock_source;
|
|
- int clock_divisor;
|
|
+ struct clk *clk;
|
|
|
|
/* Sometimes we are called into in an atomic context (e.g. by
|
|
JFFS2 + MTD) so we can't use a mutex */
|
|
@@ -82,42 +82,6 @@ struct bcm2835_smi_instance {
|
|
|
|
/****************************************************************************
|
|
*
|
|
-* SMI clock manager setup
|
|
-*
|
|
-***************************************************************************/
|
|
-
|
|
-static inline void write_smi_cm_reg(struct bcm2835_smi_instance *inst,
|
|
- u32 val, unsigned reg)
|
|
-{
|
|
- writel(CM_PWD | val, inst->cm_smi_regs_ptr + reg);
|
|
-}
|
|
-
|
|
-static inline u32 read_smi_cm_reg(struct bcm2835_smi_instance *inst,
|
|
- unsigned reg)
|
|
-{
|
|
- return readl(inst->cm_smi_regs_ptr + reg);
|
|
-}
|
|
-
|
|
-static void smi_setup_clock(struct bcm2835_smi_instance *inst)
|
|
-{
|
|
- dev_dbg(inst->dev, "Setting up clock...");
|
|
- /* Disable SMI clock and wait for it to stop. */
|
|
- write_smi_cm_reg(inst, 0, CM_SMI_CTL);
|
|
- while (read_smi_cm_reg(inst, CM_SMI_CTL) & CM_SMI_CTL_BUSY)
|
|
- ;
|
|
-
|
|
- write_smi_cm_reg(inst, (inst->clock_divisor << CM_SMI_DIV_DIVI_OFFS),
|
|
- CM_SMI_DIV);
|
|
- write_smi_cm_reg(inst, (inst->clock_source << CM_SMI_CTL_SRC_OFFS),
|
|
- CM_SMI_CTL);
|
|
-
|
|
- /* Enable the clock */
|
|
- write_smi_cm_reg(inst, (inst->clock_source << CM_SMI_CTL_SRC_OFFS) |
|
|
- CM_SMI_CTL_ENAB, CM_SMI_CTL);
|
|
-}
|
|
-
|
|
-/****************************************************************************
|
|
-*
|
|
* SMI peripheral setup
|
|
*
|
|
***************************************************************************/
|
|
@@ -894,42 +858,40 @@ static int bcm2835_smi_probe(struct plat
|
|
struct device_node *node = dev->of_node;
|
|
struct resource *ioresource;
|
|
struct bcm2835_smi_instance *inst;
|
|
+ const __be32 *addr;
|
|
|
|
+ /* We require device tree support */
|
|
+ if (!node)
|
|
+ return -EINVAL;
|
|
/* Allocate buffers and instance data */
|
|
-
|
|
inst = devm_kzalloc(dev, sizeof(struct bcm2835_smi_instance),
|
|
GFP_KERNEL);
|
|
-
|
|
if (!inst)
|
|
return -ENOMEM;
|
|
|
|
inst->dev = dev;
|
|
spin_lock_init(&inst->transaction_lock);
|
|
|
|
- /* We require device tree support */
|
|
- if (!node)
|
|
- return -EINVAL;
|
|
-
|
|
ioresource = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
inst->smi_regs_ptr = devm_ioremap_resource(dev, ioresource);
|
|
- ioresource = platform_get_resource(pdev, IORESOURCE_MEM, 1);
|
|
- inst->cm_smi_regs_ptr = devm_ioremap_resource(dev, ioresource);
|
|
- inst->smi_regs_busaddr = be32_to_cpu(
|
|
- *of_get_address(node, 0, NULL, NULL));
|
|
- of_property_read_u32(node,
|
|
- "brcm,smi-clock-source",
|
|
- &inst->clock_source);
|
|
- of_property_read_u32(node,
|
|
- "brcm,smi-clock-divisor",
|
|
- &inst->clock_divisor);
|
|
+ if (IS_ERR(inst->smi_regs_ptr)) {
|
|
+ err = PTR_ERR(inst->smi_regs_ptr);
|
|
+ goto err;
|
|
+ }
|
|
+ addr = of_get_address(node, 0, NULL, NULL);
|
|
+ inst->smi_regs_busaddr = be32_to_cpu(addr);
|
|
|
|
err = bcm2835_smi_dma_setup(inst);
|
|
if (err)
|
|
- return err;
|
|
+ goto err;
|
|
|
|
- /* Finally, do peripheral setup */
|
|
+ /* request clock */
|
|
+ inst->clk = devm_clk_get(dev, NULL);
|
|
+ if (!inst->clk)
|
|
+ goto err;
|
|
+ clk_prepare_enable(inst->clk);
|
|
|
|
- smi_setup_clock(inst);
|
|
+ /* Finally, do peripheral setup */
|
|
smi_setup_regs(inst);
|
|
|
|
platform_set_drvdata(pdev, inst);
|
|
@@ -937,6 +899,9 @@ static int bcm2835_smi_probe(struct plat
|
|
dev_info(inst->dev, "initialised");
|
|
|
|
return 0;
|
|
+err:
|
|
+ kfree(inst);
|
|
+ return err;
|
|
}
|
|
|
|
/****************************************************************************
|
|
@@ -950,6 +915,11 @@ static int bcm2835_smi_remove(struct pla
|
|
struct bcm2835_smi_instance *inst = platform_get_drvdata(pdev);
|
|
struct device *dev = inst->dev;
|
|
|
|
+ dmaengine_terminate_all(inst->dma_chan);
|
|
+ dma_release_channel(inst->dma_chan);
|
|
+
|
|
+ clk_disable_unprepare(inst->clk);
|
|
+
|
|
dev_info(dev, "SMI device removed - OK");
|
|
return 0;
|
|
}
|