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authorLinus Torvalds <torvalds@linux-foundation.org>2012-07-23 16:08:40 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-07-23 16:08:40 -0700
commit5e512d0785e67d9ff41ee4af39bb71fc6161d5c9 (patch)
tree5b0decd6d5b11138a6614c4f7b17592aa76520c6 /arch/arm/mach-tegra
parent451ce7f9cf2d17e34d5d64b76cac047a2a1a3b89 (diff)
parent233de298cb44e7dd300cd68f5abd7f1a75561fd5 (diff)
Merge tag 'soc' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc
Pull arm soc-specific updates from Arnd Bergmann: "This is stuff that does not fit well into another category and in particular is not related to a particular board. The largest part in here is extending the am33xx support in the omap platform." Fix up trivial conflicts in arch/arm/mach-{imx/mach-mx35_3ds.c, tegra/Makefile} * tag 'soc' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc: (74 commits) ARM: LPC32xx: Add PWM support ARM: LPC32xx: Add PWM clock ARM: LPC32xx: Set system serial based on cpu unique id ARM: vexpress: Config option for early printk console ARM: vexpress: Add Device Tree for V2P-CA15_CA7 core tile ARM: vexpress: Convert V2P-CA15 Device Tree to 64 bit addresses ARM: vexpress: Add fixed regulator for SMSC ARM: vexpress: Add missing SP804 interrupt in motherboard's DTS files ARM: vexpress: Initial common clock support ARM: SAMSUNG: Introduce Kconfig variable for Samsung custom clk API ARM: EXYNOS: Add missing static storage class specifier in pmu.c file ARM: EXYNOS: Make combiner_init function static ARM: EXYNOS: Update HSOTG PHY clock setting for EXYNOS4X12 ARM: versatile: Make plat-versatile clock optional ARM: vexpress: Check master site in daughterboard's sysctl operations ARM: vexpress: remove automatic errata workaround selection ARM: LPC32xx: Adjust to pl08x DMA interface changes ARM: EXYNOS: Clear SYS_WDTRESET bit to use watchdog reset ARM: imx: fix mx51 ehci setup errors ARM: imx: make ehci power/oc polarities configurable ...
Diffstat (limited to 'arch/arm/mach-tegra')
-rw-r--r--arch/arm/mach-tegra/Makefile3
-rw-r--r--arch/arm/mach-tegra/apbio.c194
-rw-r--r--arch/arm/mach-tegra/apbio.h19
-rw-r--r--arch/arm/mach-tegra/common.c3
4 files changed, 193 insertions, 26 deletions
diff --git a/arch/arm/mach-tegra/Makefile b/arch/arm/mach-tegra/Makefile
index 35253fdd1ba7..90aae34245cd 100644
--- a/arch/arm/mach-tegra/Makefile
+++ b/arch/arm/mach-tegra/Makefile
@@ -9,6 +9,7 @@ obj-y += fuse.o
obj-y += pmc.o
obj-y += flowctrl.o
obj-y += powergate.o
+obj-y += apbio.o
obj-$(CONFIG_CPU_IDLE) += cpuidle.o
obj-$(CONFIG_CPU_IDLE) += sleep.o
obj-$(CONFIG_ARCH_TEGRA_2x_SOC) += tegra2_clocks.o
@@ -18,7 +19,7 @@ obj-$(CONFIG_ARCH_TEGRA_3x_SOC) += tegra30_clocks.o
obj-$(CONFIG_SMP) += platsmp.o headsmp.o
obj-$(CONFIG_SMP) += reset.o
obj-$(CONFIG_HOTPLUG_CPU) += hotplug.o
-obj-$(CONFIG_TEGRA_SYSTEM_DMA) += dma.o apbio.o
+obj-$(CONFIG_TEGRA_SYSTEM_DMA) += dma.o
obj-$(CONFIG_CPU_FREQ) += cpu-tegra.o
obj-$(CONFIG_TEGRA_PCI) += pcie.o
obj-$(CONFIG_USB_SUPPORT) += usb_phy.o
diff --git a/arch/arm/mach-tegra/apbio.c b/arch/arm/mach-tegra/apbio.c
index e75451e517bd..dc0fe389be56 100644
--- a/arch/arm/mach-tegra/apbio.c
+++ b/arch/arm/mach-tegra/apbio.c
@@ -15,6 +15,9 @@
#include <linux/kernel.h>
#include <linux/io.h>
+#include <mach/iomap.h>
+#include <linux/of.h>
+#include <linux/dmaengine.h>
#include <linux/dma-mapping.h>
#include <linux/spinlock.h>
#include <linux/completion.h>
@@ -22,17 +25,21 @@
#include <linux/mutex.h>
#include <mach/dma.h>
-#include <mach/iomap.h>
#include "apbio.h"
+#if defined(CONFIG_TEGRA_SYSTEM_DMA) || defined(CONFIG_TEGRA20_APB_DMA)
static DEFINE_MUTEX(tegra_apb_dma_lock);
-
-static struct tegra_dma_channel *tegra_apb_dma;
static u32 *tegra_apb_bb;
static dma_addr_t tegra_apb_bb_phys;
static DECLARE_COMPLETION(tegra_apb_wait);
+static u32 tegra_apb_readl_direct(unsigned long offset);
+static void tegra_apb_writel_direct(u32 value, unsigned long offset);
+
+#if defined(CONFIG_TEGRA_SYSTEM_DMA)
+static struct tegra_dma_channel *tegra_apb_dma;
+
bool tegra_apb_init(void)
{
struct tegra_dma_channel *ch;
@@ -72,13 +79,13 @@ static void apb_dma_complete(struct tegra_dma_req *req)
complete(&tegra_apb_wait);
}
-u32 tegra_apb_readl(unsigned long offset)
+static u32 tegra_apb_readl_using_dma(unsigned long offset)
{
struct tegra_dma_req req;
int ret;
if (!tegra_apb_dma && !tegra_apb_init())
- return readl(IO_TO_VIRT(offset));
+ return tegra_apb_readl_direct(offset);
mutex_lock(&tegra_apb_dma_lock);
req.complete = apb_dma_complete;
@@ -108,13 +115,13 @@ u32 tegra_apb_readl(unsigned long offset)
return *((u32 *)tegra_apb_bb);
}
-void tegra_apb_writel(u32 value, unsigned long offset)
+static void tegra_apb_writel_using_dma(u32 value, unsigned long offset)
{
struct tegra_dma_req req;
int ret;
if (!tegra_apb_dma && !tegra_apb_init()) {
- writel(value, IO_TO_VIRT(offset));
+ tegra_apb_writel_direct(value, offset);
return;
}
@@ -143,3 +150,176 @@ void tegra_apb_writel(u32 value, unsigned long offset)
mutex_unlock(&tegra_apb_dma_lock);
}
+
+#else
+static struct dma_chan *tegra_apb_dma_chan;
+static struct dma_slave_config dma_sconfig;
+
+bool tegra_apb_dma_init(void)
+{
+ dma_cap_mask_t mask;
+
+ mutex_lock(&tegra_apb_dma_lock);
+
+ /* Check to see if we raced to setup */
+ if (tegra_apb_dma_chan)
+ goto skip_init;
+
+ dma_cap_zero(mask);
+ dma_cap_set(DMA_SLAVE, mask);
+ tegra_apb_dma_chan = dma_request_channel(mask, NULL, NULL);
+ if (!tegra_apb_dma_chan) {
+ /*
+ * This is common until the device is probed, so don't
+ * shout about it.
+ */
+ pr_debug("%s: can not allocate dma channel\n", __func__);
+ goto err_dma_alloc;
+ }
+
+ tegra_apb_bb = dma_alloc_coherent(NULL, sizeof(u32),
+ &tegra_apb_bb_phys, GFP_KERNEL);
+ if (!tegra_apb_bb) {
+ pr_err("%s: can not allocate bounce buffer\n", __func__);
+ goto err_buff_alloc;
+ }
+
+ dma_sconfig.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
+ dma_sconfig.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
+ dma_sconfig.slave_id = TEGRA_DMA_REQ_SEL_CNTR;
+ dma_sconfig.src_maxburst = 1;
+ dma_sconfig.dst_maxburst = 1;
+
+skip_init:
+ mutex_unlock(&tegra_apb_dma_lock);
+ return true;
+
+err_buff_alloc:
+ dma_release_channel(tegra_apb_dma_chan);
+ tegra_apb_dma_chan = NULL;
+
+err_dma_alloc:
+ mutex_unlock(&tegra_apb_dma_lock);
+ return false;
+}
+
+static void apb_dma_complete(void *args)
+{
+ complete(&tegra_apb_wait);
+}
+
+static int do_dma_transfer(unsigned long apb_add,
+ enum dma_transfer_direction dir)
+{
+ struct dma_async_tx_descriptor *dma_desc;
+ int ret;
+
+ if (dir == DMA_DEV_TO_MEM)
+ dma_sconfig.src_addr = apb_add;
+ else
+ dma_sconfig.dst_addr = apb_add;
+
+ ret = dmaengine_slave_config(tegra_apb_dma_chan, &dma_sconfig);
+ if (ret)
+ return ret;
+
+ dma_desc = dmaengine_prep_slave_single(tegra_apb_dma_chan,
+ tegra_apb_bb_phys, sizeof(u32), dir,
+ DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
+ if (!dma_desc)
+ return -EINVAL;
+
+ dma_desc->callback = apb_dma_complete;
+ dma_desc->callback_param = NULL;
+
+ INIT_COMPLETION(tegra_apb_wait);
+
+ dmaengine_submit(dma_desc);
+ dma_async_issue_pending(tegra_apb_dma_chan);
+ ret = wait_for_completion_timeout(&tegra_apb_wait,
+ msecs_to_jiffies(50));
+
+ if (WARN(ret == 0, "apb read dma timed out")) {
+ dmaengine_terminate_all(tegra_apb_dma_chan);
+ return -EFAULT;
+ }
+ return 0;
+}
+
+static u32 tegra_apb_readl_using_dma(unsigned long offset)
+{
+ int ret;
+
+ if (!tegra_apb_dma_chan && !tegra_apb_dma_init())
+ return tegra_apb_readl_direct(offset);
+
+ mutex_lock(&tegra_apb_dma_lock);
+ ret = do_dma_transfer(offset, DMA_DEV_TO_MEM);
+ if (ret < 0) {
+ pr_err("error in reading offset 0x%08lx using dma\n", offset);
+ *(u32 *)tegra_apb_bb = 0;
+ }
+ mutex_unlock(&tegra_apb_dma_lock);
+ return *((u32 *)tegra_apb_bb);
+}
+
+static void tegra_apb_writel_using_dma(u32 value, unsigned long offset)
+{
+ int ret;
+
+ if (!tegra_apb_dma_chan && !tegra_apb_dma_init()) {
+ tegra_apb_writel_direct(value, offset);
+ return;
+ }
+
+ mutex_lock(&tegra_apb_dma_lock);
+ *((u32 *)tegra_apb_bb) = value;
+ ret = do_dma_transfer(offset, DMA_MEM_TO_DEV);
+ if (ret < 0)
+ pr_err("error in writing offset 0x%08lx using dma\n", offset);
+ mutex_unlock(&tegra_apb_dma_lock);
+}
+#endif
+#else
+#define tegra_apb_readl_using_dma tegra_apb_readl_direct
+#define tegra_apb_writel_using_dma tegra_apb_writel_direct
+#endif
+
+typedef u32 (*apbio_read_fptr)(unsigned long offset);
+typedef void (*apbio_write_fptr)(u32 value, unsigned long offset);
+
+static apbio_read_fptr apbio_read;
+static apbio_write_fptr apbio_write;
+
+static u32 tegra_apb_readl_direct(unsigned long offset)
+{
+ return readl(IO_TO_VIRT(offset));
+}
+
+static void tegra_apb_writel_direct(u32 value, unsigned long offset)
+{
+ writel(value, IO_TO_VIRT(offset));
+}
+
+void tegra_apb_io_init(void)
+{
+ /* Need to use dma only when it is Tegra20 based platform */
+ if (of_machine_is_compatible("nvidia,tegra20") ||
+ !of_have_populated_dt()) {
+ apbio_read = tegra_apb_readl_using_dma;
+ apbio_write = tegra_apb_writel_using_dma;
+ } else {
+ apbio_read = tegra_apb_readl_direct;
+ apbio_write = tegra_apb_writel_direct;
+ }
+}
+
+u32 tegra_apb_readl(unsigned long offset)
+{
+ return apbio_read(offset);
+}
+
+void tegra_apb_writel(u32 value, unsigned long offset)
+{
+ apbio_write(value, offset);
+}
diff --git a/arch/arm/mach-tegra/apbio.h b/arch/arm/mach-tegra/apbio.h
index 8b49e8c89a64..f05d71c303c7 100644
--- a/arch/arm/mach-tegra/apbio.h
+++ b/arch/arm/mach-tegra/apbio.h
@@ -16,24 +16,7 @@
#ifndef __MACH_TEGRA_APBIO_H
#define __MACH_TEGRA_APBIO_H
-#ifdef CONFIG_TEGRA_SYSTEM_DMA
-
+void tegra_apb_io_init(void);
u32 tegra_apb_readl(unsigned long offset);
void tegra_apb_writel(u32 value, unsigned long offset);
-
-#else
-#include <asm/io.h>
-#include <mach/io.h>
-
-static inline u32 tegra_apb_readl(unsigned long offset)
-{
- return readl(IO_TO_VIRT(offset));
-}
-
-static inline void tegra_apb_writel(u32 value, unsigned long offset)
-{
- writel(value, IO_TO_VIRT(offset));
-}
-#endif
-
#endif
diff --git a/arch/arm/mach-tegra/common.c b/arch/arm/mach-tegra/common.c
index 204a5c8b0b57..96fef6bcc651 100644
--- a/arch/arm/mach-tegra/common.c
+++ b/arch/arm/mach-tegra/common.c
@@ -33,6 +33,7 @@
#include "clock.h"
#include "fuse.h"
#include "pmc.h"
+#include "apbio.h"
/*
* Storage for debug-macro.S's state.
@@ -127,6 +128,7 @@ static void __init tegra_init_cache(u32 tag_latency, u32 data_latency)
#ifdef CONFIG_ARCH_TEGRA_2x_SOC
void __init tegra20_init_early(void)
{
+ tegra_apb_io_init();
tegra_init_fuse();
tegra2_init_clocks();
tegra_clk_init_from_table(tegra20_clk_init_table);
@@ -138,6 +140,7 @@ void __init tegra20_init_early(void)
#ifdef CONFIG_ARCH_TEGRA_3x_SOC
void __init tegra30_init_early(void)
{
+ tegra_apb_io_init();
tegra_init_fuse();
tegra30_init_clocks();
tegra_clk_init_from_table(tegra30_clk_init_table);