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171 lines
4.8 KiB
Diff
171 lines
4.8 KiB
Diff
From f7cccb2e66f0187f69a432536f227b32a458f94b Mon Sep 17 00:00:00 2001
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From: Martin Sperl <kernel@martin.sperl.org>
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Date: Tue, 26 Apr 2016 14:59:21 +0000
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Subject: [PATCH] MISC: bcm2835: smi: use clock manager and fix reload
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issues
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Use clock manager instead of self-made clockmanager.
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Also fix some error paths that showd up during development
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(especially missing release of dma resources on rmmod)
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Signed-off-by: Martin Sperl <kernel@martin.sperl.org>
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---
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drivers/misc/bcm2835_smi.c | 86 +++++++++++++-------------------------
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1 file changed, 28 insertions(+), 58 deletions(-)
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--- a/drivers/misc/bcm2835_smi.c
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+++ b/drivers/misc/bcm2835_smi.c
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@@ -34,6 +34,7 @@
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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+#include <linux/clk.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/of.h>
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@@ -62,7 +63,7 @@
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struct bcm2835_smi_instance {
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struct device *dev;
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struct smi_settings settings;
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- __iomem void *smi_regs_ptr, *cm_smi_regs_ptr;
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+ __iomem void *smi_regs_ptr;
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dma_addr_t smi_regs_busaddr;
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struct dma_chan *dma_chan;
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@@ -72,8 +73,7 @@ struct bcm2835_smi_instance {
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struct scatterlist buffer_sgl;
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- int clock_source;
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- int clock_divisor;
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+ struct clk *clk;
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/* Sometimes we are called into in an atomic context (e.g. by
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JFFS2 + MTD) so we can't use a mutex */
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@@ -82,42 +82,6 @@ struct bcm2835_smi_instance {
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/****************************************************************************
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*
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-* SMI clock manager setup
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-*
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-***************************************************************************/
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-
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-static inline void write_smi_cm_reg(struct bcm2835_smi_instance *inst,
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- u32 val, unsigned reg)
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-{
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- writel(CM_PWD | val, inst->cm_smi_regs_ptr + reg);
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-}
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-
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-static inline u32 read_smi_cm_reg(struct bcm2835_smi_instance *inst,
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- unsigned reg)
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-{
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- return readl(inst->cm_smi_regs_ptr + reg);
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-}
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-
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-static void smi_setup_clock(struct bcm2835_smi_instance *inst)
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-{
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- dev_dbg(inst->dev, "Setting up clock...");
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- /* Disable SMI clock and wait for it to stop. */
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- write_smi_cm_reg(inst, 0, CM_SMI_CTL);
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- while (read_smi_cm_reg(inst, CM_SMI_CTL) & CM_SMI_CTL_BUSY)
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- ;
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-
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- write_smi_cm_reg(inst, (inst->clock_divisor << CM_SMI_DIV_DIVI_OFFS),
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- CM_SMI_DIV);
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- write_smi_cm_reg(inst, (inst->clock_source << CM_SMI_CTL_SRC_OFFS),
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- CM_SMI_CTL);
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-
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- /* Enable the clock */
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- write_smi_cm_reg(inst, (inst->clock_source << CM_SMI_CTL_SRC_OFFS) |
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- CM_SMI_CTL_ENAB, CM_SMI_CTL);
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-}
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-
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-/****************************************************************************
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-*
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* SMI peripheral setup
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*
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***************************************************************************/
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@@ -894,42 +858,40 @@ static int bcm2835_smi_probe(struct plat
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struct device_node *node = dev->of_node;
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struct resource *ioresource;
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struct bcm2835_smi_instance *inst;
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+ const __be32 *addr;
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+ /* We require device tree support */
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+ if (!node)
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+ return -EINVAL;
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/* Allocate buffers and instance data */
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-
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inst = devm_kzalloc(dev, sizeof(struct bcm2835_smi_instance),
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GFP_KERNEL);
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-
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if (!inst)
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return -ENOMEM;
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inst->dev = dev;
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spin_lock_init(&inst->transaction_lock);
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- /* We require device tree support */
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- if (!node)
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- return -EINVAL;
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-
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ioresource = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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inst->smi_regs_ptr = devm_ioremap_resource(dev, ioresource);
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- ioresource = platform_get_resource(pdev, IORESOURCE_MEM, 1);
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- inst->cm_smi_regs_ptr = devm_ioremap_resource(dev, ioresource);
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- inst->smi_regs_busaddr = be32_to_cpu(
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- *of_get_address(node, 0, NULL, NULL));
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- of_property_read_u32(node,
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- "brcm,smi-clock-source",
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- &inst->clock_source);
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- of_property_read_u32(node,
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- "brcm,smi-clock-divisor",
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- &inst->clock_divisor);
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+ if (IS_ERR(inst->smi_regs_ptr)) {
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+ err = PTR_ERR(inst->smi_regs_ptr);
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+ goto err;
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+ }
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+ addr = of_get_address(node, 0, NULL, NULL);
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+ inst->smi_regs_busaddr = be32_to_cpu(addr);
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err = bcm2835_smi_dma_setup(inst);
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if (err)
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- return err;
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+ goto err;
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- /* Finally, do peripheral setup */
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+ /* request clock */
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+ inst->clk = devm_clk_get(dev, NULL);
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+ if (!inst->clk)
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+ goto err;
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+ clk_prepare_enable(inst->clk);
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- smi_setup_clock(inst);
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+ /* Finally, do peripheral setup */
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smi_setup_regs(inst);
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platform_set_drvdata(pdev, inst);
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@@ -937,6 +899,9 @@ static int bcm2835_smi_probe(struct plat
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dev_info(inst->dev, "initialised");
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return 0;
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+err:
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+ kfree(inst);
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+ return err;
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}
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/****************************************************************************
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@@ -950,6 +915,11 @@ static int bcm2835_smi_remove(struct pla
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struct bcm2835_smi_instance *inst = platform_get_drvdata(pdev);
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struct device *dev = inst->dev;
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+ dmaengine_terminate_all(inst->dma_chan);
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+ dma_release_channel(inst->dma_chan);
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+
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+ clk_disable_unprepare(inst->clk);
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+
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dev_info(dev, "SMI device removed - OK");
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return 0;
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}
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