diff options
Diffstat (limited to 'target/linux/brcm2708/patches-4.9/0043-MISC-bcm2835-smi-use-clock-manager-and-fix-reload-is.patch')
| -rw-r--r-- | target/linux/brcm2708/patches-4.9/0043-MISC-bcm2835-smi-use-clock-manager-and-fix-reload-is.patch | 169 |
1 files changed, 169 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.9/0043-MISC-bcm2835-smi-use-clock-manager-and-fix-reload-is.patch b/target/linux/brcm2708/patches-4.9/0043-MISC-bcm2835-smi-use-clock-manager-and-fix-reload-is.patch new file mode 100644 index 0000000000..312a294bc7 --- /dev/null +++ b/target/linux/brcm2708/patches-4.9/0043-MISC-bcm2835-smi-use-clock-manager-and-fix-reload-is.patch @@ -0,0 +1,169 @@ +From 6e5058f6cb203dd31935ba03eeff0d98c7531bcf 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; + } |