diff options
Diffstat (limited to 'target/linux/brcm2708/patches-4.1/0189-Add-SMI-driver.patch')
| -rw-r--r-- | target/linux/brcm2708/patches-4.1/0189-Add-SMI-driver.patch | 2028 |
1 files changed, 0 insertions, 2028 deletions
diff --git a/target/linux/brcm2708/patches-4.1/0189-Add-SMI-driver.patch b/target/linux/brcm2708/patches-4.1/0189-Add-SMI-driver.patch deleted file mode 100644 index 287e27b2fd..0000000000 --- a/target/linux/brcm2708/patches-4.1/0189-Add-SMI-driver.patch +++ /dev/null @@ -1,2028 +0,0 @@ -From 8174e93335b0ebd7d7eb4484cd1518547b00d336 Mon Sep 17 00:00:00 2001 -From: Luke Wren <wren6991@gmail.com> -Date: Sat, 5 Sep 2015 01:14:45 +0100 -Subject: [PATCH 189/222] Add SMI driver - -Signed-off-by: Luke Wren <wren6991@gmail.com> ---- - .../bindings/misc/brcm,bcm2835-smi-dev.txt | 17 + - .../devicetree/bindings/misc/brcm,bcm2835-smi.txt | 48 + - arch/arm/boot/dts/bcm2708_common.dtsi | 11 + - arch/arm/boot/dts/overlays/Makefile | 2 + - arch/arm/boot/dts/overlays/smi-dev-overlay.dts | 18 + - arch/arm/boot/dts/overlays/smi-overlay.dts | 37 + - drivers/char/broadcom/Kconfig | 8 + - drivers/char/broadcom/Makefile | 2 +- - drivers/char/broadcom/bcm2835_smi_dev.c | 402 +++++++++ - drivers/misc/Kconfig | 8 + - drivers/misc/Makefile | 1 + - drivers/misc/bcm2835_smi.c | 985 +++++++++++++++++++++ - include/linux/broadcom/bcm2835_smi.h | 391 ++++++++ - 13 files changed, 1929 insertions(+), 1 deletion(-) - create mode 100644 Documentation/devicetree/bindings/misc/brcm,bcm2835-smi-dev.txt - create mode 100644 Documentation/devicetree/bindings/misc/brcm,bcm2835-smi.txt - create mode 100644 arch/arm/boot/dts/overlays/smi-dev-overlay.dts - create mode 100644 arch/arm/boot/dts/overlays/smi-overlay.dts - create mode 100644 drivers/char/broadcom/bcm2835_smi_dev.c - create mode 100644 drivers/misc/bcm2835_smi.c - create mode 100644 include/linux/broadcom/bcm2835_smi.h - ---- /dev/null -+++ b/Documentation/devicetree/bindings/misc/brcm,bcm2835-smi-dev.txt -@@ -0,0 +1,17 @@ -+* Broadcom BCM2835 SMI character device driver. -+ -+SMI or secondary memory interface is a peripheral specific to certain Broadcom -+SOCs, and is helpful for talking to things like parallel-interface displays -+and NAND flashes (in fact, most things with a parallel register interface). -+ -+This driver adds a character device which provides a user-space interface to -+an instance of the SMI driver. -+ -+Required properties: -+- compatible: "brcm,bcm2835-smi-dev" -+- smi_handle: a phandle to the smi node. -+ -+Optional properties: -+- None. -+ -+ ---- /dev/null -+++ b/Documentation/devicetree/bindings/misc/brcm,bcm2835-smi.txt -@@ -0,0 +1,48 @@ -+* Broadcom BCM2835 SMI driver. -+ -+SMI or secondary memory interface is a peripheral specific to certain Broadcom -+SOCs, and is helpful for talking to things like parallel-interface displays -+and NAND flashes (in fact, most things with a parallel register interface). -+ -+Required properties: -+- compatible: "brcm,bcm2835-smi" -+- reg: Should contain location and length of SMI registers and SMI clkman regs -+- interrupts: *the* SMI interrupt. -+- pinctrl-names: should be "default". -+- pinctrl-0: the phandle of the gpio pin node. -+- brcm,smi-clock-source: the clock source for clkman -+- brcm,smi-clock-divisor: the integer clock divisor for clkman -+- dmas: the dma controller phandle and the DREQ number (4 on a 2835) -+- dma-names: the name used by the driver to request its channel. -+ Should be "rx-tx". -+ -+Optional properties: -+- None. -+ -+Examples: -+ -+8 data pin configuration: -+ -+smi: smi@7e600000 { -+ compatible = "brcm,bcm2835-smi"; -+ reg = <0x7e600000 0x44>, <0x7e1010b0 0x8>; -+ interrupts = <2 16>; -+ pinctrl-names = "default"; -+ pinctrl-0 = <&smi_pins>; -+ brcm,smi-clock-source = <6>; -+ brcm,smi-clock-divisor = <4>; -+ dmas = <&dma 4>; -+ dma-names = "rx-tx"; -+ -+ status = "okay"; -+}; -+ -+smi_pins: smi_pins { -+ brcm,pins = <2 3 4 5 6 7 8 9 10 11 12 13 14 15>; -+ /* Alt 1: SMI */ -+ brcm,function = <5 5 5 5 5 5 5 5 5 5 5 5 5 5>; -+ /* /CS, /WE and /OE are pulled high, as they are -+ generally active low signals */ -+ brcm,pull = <2 2 2 2 2 2 0 0 0 0 0 0 0 0>; -+}; -+ ---- a/arch/arm/boot/dts/bcm2708_common.dtsi -+++ b/arch/arm/boot/dts/bcm2708_common.dtsi -@@ -205,6 +205,17 @@ - status = "disabled"; - }; - -+ smi: smi@7e600000 { -+ compatible = "brcm,bcm2835-smi"; -+ reg = <0x7e600000 0x44>, <0x7e1010b0 0x8>; -+ interrupts = <2 16>; -+ brcm,smi-clock-source = <6>; -+ brcm,smi-clock-divisor = <4>; -+ dmas = <&dma 4>; -+ dma-names = "rx-tx"; -+ status = "disabled"; -+ }; -+ - usb: usb@7e980000 { - compatible = "brcm,bcm2708-usb"; - reg = <0x7e980000 0x10000>, ---- a/arch/arm/boot/dts/overlays/Makefile -+++ b/arch/arm/boot/dts/overlays/Makefile -@@ -13,6 +13,8 @@ ifeq ($(CONFIG_ARCH_BCM2835),y) - endif - - dtb-$(RPI_DT_OVERLAYS) += ads7846-overlay.dtb -+dtb-$(RPI_DT_OVERLAYS) += smi-overlay.dtb -+dtb-$(RPI_DT_OVERLAYS) += smi-dev-overlay.dtb - dtb-$(RPI_DT_OVERLAYS) += bmp085_i2c-sensor-overlay.dtb - dtb-$(RPI_DT_OVERLAYS) += dht11-overlay.dtb - dtb-$(RPI_DT_OVERLAYS) += enc28j60-overlay.dtb ---- /dev/null -+++ b/arch/arm/boot/dts/overlays/smi-dev-overlay.dts -@@ -0,0 +1,18 @@ -+// Description: Overlay to enable character device interface for SMI. -+// Author: Luke Wren <luke@raspberrypi.org> -+ -+/dts-v1/; -+/plugin/; -+ -+/{ -+ fragment@0 { -+ target = <&soc>; -+ __overlay__ { -+ smi_dev { -+ compatible = "brcm,bcm2835-smi-dev"; -+ smi_handle = <&smi>; -+ status = "okay"; -+ }; -+ }; -+ }; -+}; ---- /dev/null -+++ b/arch/arm/boot/dts/overlays/smi-overlay.dts -@@ -0,0 +1,37 @@ -+// Description: Overlay to enable the secondary memory interface peripheral -+// Author: Luke Wren -+ -+/dts-v1/; -+/plugin/; -+ -+/{ -+ compatible = "brcm,bcm2708"; -+ -+ fragment@0 { -+ target = <&smi>; -+ __overlay__ { -+ pinctrl-names = "default"; -+ pinctrl-0 = <&smi_pins>; -+ status = "okay"; -+ }; -+ }; -+ -+ fragment@1 { -+ target = <&gpio>; -+ __overlay__ { -+ smi_pins: smi_pins { -+ /* Don't configure the top two address bits, as -+ these are already used as ID_SD and ID_SC */ -+ brcm,pins = <2 3 4 5 6 7 8 9 10 11 12 13 14 15 -+ 16 17 18 19 20 21 22 23 24 25>; -+ /* Alt 0: SMI */ -+ brcm,function = <5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 -+ 5 5 5 5 5 5 5 5 5>; -+ /* /CS, /WE and /OE are pulled high, as they are -+ generally active low signals */ -+ brcm,pull = <2 2 2 2 2 2 0 0 0 0 0 0 0 0 0 0 0 -+ 0 0 0 0 0 0 0>; -+ }; -+ }; -+ }; -+}; ---- a/drivers/char/broadcom/Kconfig -+++ b/drivers/char/broadcom/Kconfig -@@ -47,3 +47,11 @@ config BCM2835_DEVGPIOMEM - on the 2835. Calling mmap(/dev/gpiomem) will map the GPIO - register page to the user's pointer. - -+config BCM2835_SMI_DEV -+ tristate "Character device driver for BCM2835 Secondary Memory Interface" -+ depends on (MACH_BCM2708 || MACH_BCM2709 || ARCH_BCM2835) && BCM2835_SMI -+ default m -+ help -+ This driver provides a character device interface (ioctl + read/write) to -+ Broadcom's Secondary Memory interface. The low-level functionality is provided -+ by the SMI driver itself. ---- a/drivers/char/broadcom/Makefile -+++ b/drivers/char/broadcom/Makefile -@@ -4,4 +4,4 @@ obj-$(CONFIG_BCM_VCIO) += vcio.o - obj-$(CONFIG_BCM_VC_SM) += vc_sm/ - - obj-$(CONFIG_BCM2835_DEVGPIOMEM)+= bcm2835-gpiomem.o -- -+obj-$(CONFIG_BCM2835_SMI_DEV) += bcm2835_smi_dev.o ---- /dev/null -+++ b/drivers/char/broadcom/bcm2835_smi_dev.c -@@ -0,0 +1,402 @@ -+/** -+ * Character device driver for Broadcom Secondary Memory Interface -+ * -+ * Written by Luke Wren <luke@raspberrypi.org> -+ * Copyright (c) 2015, Raspberry Pi (Trading) Ltd. -+ * -+ * Redistribution and use in source and binary forms, with or without -+ * modification, are permitted provided that the following conditions -+ * are met: -+ * 1. Redistributions of source code must retain the above copyright -+ * notice, this list of conditions, and the following disclaimer, -+ * without modification. -+ * 2. Redistributions in binary form must reproduce the above copyright -+ * notice, this list of conditions and the following disclaimer in the -+ * documentation and/or other materials provided with the distribution. -+ * 3. The names of the above-listed copyright holders may not be used -+ * to endorse or promote products derived from this software without -+ * specific prior written permission. -+ * -+ * ALTERNATIVELY, this software may be distributed under the terms of the -+ * GNU General Public License ("GPL") version 2, as published by the Free -+ * Software Foundation. -+ * -+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS -+ * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, -+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR -+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR -+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, -+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, -+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR -+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF -+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING -+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS -+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. -+ */ -+ -+#include <linux/kernel.h> -+#include <linux/module.h> -+#include <linux/of.h> -+#include <linux/platform_device.h> -+#include <linux/slab.h> -+#include <linux/mm.h> -+#include <linux/pagemap.h> -+#include <linux/fs.h> -+#include <linux/cdev.h> -+#include <linux/fs.h> -+ -+#include <linux/broadcom/bcm2835_smi.h> -+ -+#define DEVICE_NAME "bcm2835-smi-dev" -+#define DRIVER_NAME "smi-dev-bcm2835" -+#define DEVICE_MINOR 0 -+ -+static struct cdev bcm2835_smi_cdev; -+static dev_t bcm2835_smi_devid; -+static struct class *bcm2835_smi_class; -+static struct device *bcm2835_smi_dev; -+ -+struct bcm2835_smi_dev_instance { -+ struct device *dev; -+}; -+ -+static struct bcm2835_smi_instance *smi_inst; -+static struct bcm2835_smi_dev_instance *inst; -+ -+static const char *const ioctl_names[] = { -+ "READ_SETTINGS", -+ "WRITE_SETTINGS", -+ "ADDRESS" -+}; -+ -+/**************************************************************************** -+* -+* SMI chardev file ops -+* -+***************************************************************************/ -+static long -+bcm2835_smi_ioctl(struct file *file, unsigned int cmd, unsigned long arg) -+{ -+ long ret = 0; -+ -+ dev_info(inst->dev, "serving ioctl..."); -+ -+ switch (cmd) { -+ case BCM2835_SMI_IOC_GET_SETTINGS:{ -+ struct smi_settings *settings; -+ -+ dev_info(inst->dev, "Reading SMI settings to user."); -+ settings = bcm2835_smi_get_settings_from_regs(smi_inst); -+ if (copy_to_user((void *)arg, settings, -+ sizeof(struct smi_settings))) -+ dev_err(inst->dev, "settings copy failed."); -+ break; -+ } -+ case BCM2835_SMI_IOC_WRITE_SETTINGS:{ -+ struct smi_settings *settings; -+ -+ dev_info(inst->dev, "Setting user's SMI settings."); -+ settings = bcm2835_smi_get_settings_from_regs(smi_inst); -+ if (copy_from_user(settings, (void *)arg, -+ sizeof(struct smi_settings))) -+ dev_err(inst->dev, "settings copy failed."); -+ else -+ bcm2835_smi_set_regs_from_settings(smi_inst); -+ break; -+ } -+ case BCM2835_SMI_IOC_ADDRESS: -+ dev_info(inst->dev, "SMI address set: 0x%02x", (int)arg); -+ bcm2835_smi_set_address(smi_inst, arg); -+ break; -+ default: -+ dev_err(inst->dev, "invalid ioctl cmd: %d", cmd); -+ ret = -ENOTTY; -+ break; -+ } -+ -+ return ret; -+} -+ -+static int bcm2835_smi_open(struct inode *inode, struct file *file) -+{ -+ int dev = iminor(inode); -+ -+ dev_dbg(inst->dev, "SMI device opened."); -+ -+ if (dev != DEVICE_MINOR) { -+ dev_err(inst->dev, -+ "bcm2835_smi_release: Unknown minor device: %d", -+ dev); -+ return -ENXIO; -+ } -+ -+ return 0; -+} -+ -+static int bcm2835_smi_release(struct inode *inode, struct file *file) -+{ -+ int dev = iminor(inode); -+ -+ if (dev != DEVICE_MINOR) { -+ dev_err(inst->dev, -+ "bcm2835_smi_release: Unknown minor device %d", dev); -+ return -ENXIO; -+ } -+ -+ return 0; -+} -+ -+static ssize_t dma_bounce_user( -+ enum dma_transfer_direction dma_dir, -+ char __user *user_ptr, -+ size_t count, -+ struct bcm2835_smi_bounce_info *bounce) -+{ -+ int chunk_size; -+ int chunk_no = 0; -+ int count_left = count; -+ -+ while (count_left) { -+ int rv; -+ void *buf; -+ -+ /* Wait for current chunk to complete: */ -+ if (down_timeout(&bounce->callback_sem, -+ msecs_to_jiffies(1000))) { -+ dev_err(inst->dev, "DMA bounce timed out"); -+ count -= (count_left); -+ break; -+ } -+ -+ if (bounce->callback_sem.count >= DMA_BOUNCE_BUFFER_COUNT - 1) -+ dev_err(inst->dev, "WARNING: Ring buffer overflow"); -+ chunk_size = count_left > DMA_BOUNCE_BUFFER_SIZE ? -+ DMA_BOUNCE_BUFFER_SIZE : count_left; -+ buf = bounce->buffer[chunk_no % DMA_BOUNCE_BUFFER_COUNT]; -+ if (dma_dir == DMA_DEV_TO_MEM) -+ rv = copy_to_user(user_ptr, buf, chunk_size); -+ else -+ rv = copy_from_user(buf, user_ptr, chunk_size); -+ if (rv) -+ dev_err(inst->dev, "copy_*_user() failed!: %d", rv); -+ user_ptr += chunk_size; -+ count_left -= chunk_size; -+ chunk_no++; -+ } -+ return count; -+} -+ -+static ssize_t -+bcm2835_read_file(struct file *f, char __user *user_ptr, -+ size_t count, loff_t *offs) -+{ -+ int odd_bytes; -+ -+ dev_dbg(inst->dev, "User reading %d bytes from SMI.", count); -+ /* We don't want to DMA a number of bytes % 4 != 0 (32 bit FIFO) */ -+ if (count > DMA_THRESHOLD_BYTES) -+ odd_bytes = count & 0x3; -+ else -+ odd_bytes = count; -+ count -= odd_bytes; -+ if (count) { -+ struct bcm2835_smi_bounce_info *bounce; -+ -+ count = bcm2835_smi_user_dma(smi_inst, -+ DMA_DEV_TO_MEM, user_ptr, count, -+ &bounce); -+ if (count) -+ count = dma_bounce_user(DMA_DEV_TO_MEM, user_ptr, -+ count, bounce); -+ } -+ if (odd_bytes) { -+ /* Read from FIFO directly if not using DMA */ -+ uint8_t buf[DMA_THRESHOLD_BYTES]; -+ -+ bcm2835_smi_read_buf(smi_inst, buf, odd_bytes); -+ if (copy_to_user(user_ptr, buf, odd_bytes)) -+ dev_err(inst->dev, "copy_to_user() failed."); -+ count += odd_bytes; -+ -+ } -+ return count; -+} -+ -+static ssize_t -+bcm2835_write_file(struct file *f, const char __user *user_ptr, -+ size_t count, loff_t *offs) -+{ -+ int odd_bytes; -+ -+ dev_dbg(inst->dev, "User writing %d bytes to SMI.", count); -+ if (count > DMA_THRESHOLD_BYTES) -+ odd_bytes = count & 0x3; -+ else -+ odd_bytes = count; -+ count -= odd_bytes; -+ if (count) { -+ struct bcm2835_smi_bounce_info *bounce; -+ -+ count = bcm2835_smi_user_dma(smi_inst, -+ DMA_MEM_TO_DEV, (char __user *)user_ptr, count, -+ &bounce); -+ if (count) -+ count = dma_bounce_user(DMA_MEM_TO_DEV, -+ (char __user *)user_ptr, -+ count, bounce); -+ } -+ if (odd_bytes) { -+ uint8_t buf[DMA_THRESHOLD_BYTES]; -+ -+ if (copy_from_user(buf, user_ptr, odd_bytes)) -+ dev_err(inst->dev, "copy_from_user() failed."); -+ else -+ bcm2835_smi_write_buf(smi_inst, buf, odd_bytes); -+ count += odd_bytes; -+ } -+ return count; -+} -+ -+static const struct file_operations -+bcm2835_smi_fops = { -+ .owner = THIS_MODULE, -+ .unlocked_ioctl = bcm2835_smi_ioctl, -+ .open = bcm2835_smi_open, -+ .release = bcm2835_smi_release, -+ .read = bcm2835_read_file, -+ .write = bcm2835_write_file, -+}; -+ -+ -+/**************************************************************************** -+* -+* bcm2835_smi_probe - called when the driver is loaded. -+* -+***************************************************************************/ -+ -+static int bcm2835_smi_dev_probe(struct platform_device *pdev) -+{ -+ int err; -+ void *ptr_err; -+ struct device *dev = &pdev->dev; -+ struct device_node *node = dev->of_node, *smi_node; -+ -+ if (!node) { -+ dev_err(dev, "No device tree node supplied!"); -+ return -EINVAL; -+ } -+ -+ smi_node = of_parse_phandle(node, "smi_handle", 0); -+ -+ if (!smi_node) { -+ dev_err(dev, "No such property: smi_handle"); -+ return -ENXIO; -+ } -+ -+ smi_inst = bcm2835_smi_get(smi_node); -+ -+ if (!smi_inst) -+ return -EPROBE_DEFER; -+ -+ /* Allocate buffers and instance data */ -+ -+ inst = devm_kzalloc(dev, sizeof(*inst), GFP_KERNEL); -+ -+ if (!inst) -+ return -ENOMEM; -+ -+ inst->dev = dev; -+ -+ /* Create character device entries */ -+ -+ err = alloc_chrdev_region(&bcm2835_smi_devid, -+ DEVICE_MINOR, 1, DEVICE_NAME); -+ if (err != 0) { -+ dev_err(inst->dev, "unable to allocate device number"); -+ return -ENOMEM; -+ } -+ cdev_init(&bcm2835_smi_cdev, &bcm2835_smi_fops); -+ bcm2835_smi_cdev.owner = THIS_MODULE; -+ err = cdev_add(&bcm2835_smi_cdev, bcm2835_smi_devid, 1); -+ if (err != 0) { -+ dev_err(inst->dev, "unable to register device"); -+ err = -ENOMEM; -+ goto failed_cdev_add; -+ } -+ -+ /* Create sysfs entries */ -+ -+ bcm2835_smi_class = class_create(THIS_MODULE, DEVICE_NAME); -+ ptr_err = bcm2835_smi_class; -+ if (IS_ERR(ptr_err)) -+ goto failed_class_create; -+ -+ bcm2835_smi_dev = device_create(bcm2835_smi_class, NULL, -+ bcm2835_smi_devid, NULL, -+ "smi"); -+ ptr_err = bcm2835_smi_dev; -+ if (IS_ERR(ptr_err)) -+ goto failed_device_create; -+ -+ dev_info(inst->dev, "initialised"); -+ -+ return 0; -+ -+failed_device_create: -+ class_destroy(bcm2835_smi_class); -+failed_class_create: -+ cdev_del(&bcm2835_smi_cdev); -+ err = PTR_ERR(ptr_err); -+failed_cdev_add: -+ unregister_chrdev_region(bcm2835_smi_devid, 1); -+ dev_err(dev, "could not load bcm2835_smi_dev"); -+ return err; -+} -+ -+/**************************************************************************** -+* -+* bcm2835_smi_remove - called when the driver is unloaded. -+* -+***************************************************************************/ -+ -+static int bcm2835_smi_dev_remove(struct platform_device *pdev) -+{ -+ device_destroy(bcm2835_smi_class, bcm2835_smi_devid); -+ class_destroy(bcm2835_smi_class); -+ cdev_del(&bcm2835_smi_cdev); -+ unregister_chrdev_region(bcm2835_smi_devid, 1); -+ -+ dev_info(inst->dev, "SMI character dev removed - OK"); -+ return 0; -+} -+ -+/**************************************************************************** -+* -+* Register the driver with device tree -+* -+***************************************************************************/ -+ -+static const struct of_device_id bcm2835_smi_dev_of_match[] = { -+ {.compatible = "brcm,bcm2835-smi-dev",}, -+ { /* sentinel */ }, -+}; -+ -+MODULE_DEVICE_TABLE(of, bcm2835_smi_dev_of_match); -+ -+static struct platform_driver bcm2835_smi_dev_driver = { -+ .probe = bcm2835_smi_dev_probe, -+ .remove = bcm2835_smi_dev_remove, -+ .driver = { -+ .name = DRIVER_NAME, -+ .owner = THIS_MODULE, -+ .of_match_table = bcm2835_smi_dev_of_match, -+ }, -+}; -+ -+module_platform_driver(bcm2835_smi_dev_driver); -+ -+MODULE_ALIAS("platform:smi-dev-bcm2835"); -+MODULE_LICENSE("GPL"); -+MODULE_DESCRIPTION( -+ "Character device driver for BCM2835's secondary memory interface"); -+MODULE_AUTHOR("Luke Wren <luke@raspberrypi.org>"); ---- a/drivers/misc/Kconfig -+++ b/drivers/misc/Kconfig -@@ -10,6 +10,14 @@ config SENSORS_LIS3LV02D - select INPUT_POLLDEV - default n - -+config BCM2835_SMI -+ tristate "Broadcom 283x Secondary Memory Interface driver" -+ depends on MACH_BCM2708 || MACH_BCM2709 || ARCH_BCM2835 -+ default m -+ help -+ Driver for enabling and using Broadcom's Secondary/Slow Memory Interface. -+ Appears as /dev/bcm2835_smi. For ioctl interface see drivers/misc/bcm2835_smi.h -+ - config AD525X_DPOT - tristate "Analog Devices Digital Potentiometers" - depends on (I2C || SPI) && SYSFS ---- a/drivers/misc/Makefile -+++ b/drivers/misc/Makefile -@@ -9,6 +9,7 @@ obj-$(CONFIG_AD525X_DPOT_SPI) += ad525x_ - obj-$(CONFIG_INTEL_MID_PTI) += pti.o - obj-$(CONFIG_ATMEL_SSC) += atmel-ssc.o - obj-$(CONFIG_ATMEL_TCLIB) += atmel_tclib.o -+obj-$(CONFIG_BCM2835_SMI) += bcm2835_smi.o - obj-$(CONFIG_BMP085) += bmp085.o - obj-$(CONFIG_BMP085_I2C) += bmp085-i2c.o - obj-$(CONFIG_BMP085_SPI) += bmp085-spi.o ---- /dev/null -+++ b/drivers/misc/bcm2835_smi.c -@@ -0,0 +1,985 @@ -+/** -+ * Broadcom Secondary Memory Interface driver -+ * -+ * Written by Luke Wren <luke@raspberrypi.org> -+ * Copyright (c) 2015, Raspberry Pi (Trading) Ltd. -+ * -+ * Redistribution and use in source and binary forms, with or without -+ * modification, are permitted provided that the following conditions -+ * are met: -+ * 1. Redistributions of source code must retain the above copyright -+ * notice, this list of conditions, and the following disclaimer, -+ * without modification. -+ * 2. Redistributions in binary form must reproduce the above copyright -+ * notice, this list of conditions and the following disclaimer in the -+ * documentation and/or other materials provided with the distribution. -+ * 3. The names of the above-listed copyright holders may not be used -+ * to endorse or promote products derived from this software without -+ * specific prior written permission. -+ * -+ * ALTERNATIVELY, this software may be distributed under the terms of the -+ * GNU General Public License ("GPL") version 2, as published by the Free -+ * Software Foundation. -+ * -+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS -+ * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, -+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR -+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR -+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, -+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, -+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR -+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF -+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING -+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS -+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. -+ */ -+ -+#include <linux/kernel.h> -+#include <linux/module.h> -+#include <linux/of.h> -+#include <linux/platform_device.h> -+#include <linux/of_address.h> -+#include <linux/of_platform.h> -+#include <linux/mm.h> -+#include <linux/slab.h> -+#include <linux/pagemap.h> -+#include <linux/dma-mapping.h> -+#include <linux/dmaengine.h> -+#include <linux/semaphore.h> -+#include <linux/spinlock.h> -+#include <linux/io.h> -+ -+#define BCM2835_SMI_IMPLEMENTATION -+#include <linux/broadcom/bcm2835_smi.h> -+ -+#define DRIVER_NAME "smi-bcm2835" -+ -+#define N_PAGES_FROM_BYTES(n) ((n + PAGE_SIZE-1) / PAGE_SIZE) -+ -+#define DMA_WRITE_TO_MEM true -+#define DMA_READ_FROM_MEM false -+ -+struct bcm2835_smi_instance { -+ struct device *dev; -+ struct smi_settings settings; -+ __iomem void *smi_regs_ptr, *cm_smi_regs_ptr; -+ dma_addr_t smi_regs_busaddr; -+ -+ struct dma_chan *dma_chan; -+ struct dma_slave_config dma_config; -+ -+ struct bcm2835_smi_bounce_info bounce; -+ -+ struct scatterlist buffer_sgl; -+ -+ int clock_source; -+ int clock_divisor; -+ -+ /* Sometimes we are called into in an atomic context (e.g. by -+ JFFS2 + MTD) so we can't use a mutex */ -+ spinlock_t transaction_lock; -+}; -+ -+/**************************************************************************** -+* -+* 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 -+* -+***************************************************************************/ -+ -+static inline void write_smi_reg(struct bcm2835_smi_instance *inst, -+ u32 val, unsigned reg) -+{ -+ writel(val, inst->smi_regs_ptr + reg); -+} -+ -+static inline u32 read_smi_reg(struct bcm2835_smi_instance *inst, unsigned reg) -+{ -+ return readl(inst->smi_regs_ptr + reg); -+} -+ -+/* Token-paste macro for e.g SMIDSR_RSTROBE -> value of SMIDSR_RSTROBE_MASK */ -+#define _CONCAT(x, y) x##y -+#define CONCAT(x, y) _CONCAT(x, y) -+ -+#define SET_BIT_FIELD(dest, field, bits) ((dest) = \ -+ ((dest) & ~CONCAT(field, _MASK)) | (((bits) << CONCAT(field, _OFFS))& \ -+ CONCAT(field, _MASK))) -+#define GET_BIT_FIELD(src, field) (((src) & \ -+ CONCAT(field, _MASK)) >> CONCAT(field, _OFFS)) -+ -+static void smi_dump_context_labelled(struct bcm2835_smi_instance *inst, -+ const char *label) -+{ -+ dev_err(inst->dev, "SMI context dump: %s", label); -+ dev_err(inst->dev, "SMICS: 0x%08x", read_smi_reg(inst, SMICS)); -+ dev_err(inst->dev, "SMIL: 0x%08x", read_smi_reg(inst, SMIL)); -+ dev_err(inst->dev, "SMIDSR: 0x%08x", read_smi_reg(inst, SMIDSR0)); -+ dev_err(inst->dev, "SMIDSW: 0x%08x", read_smi_reg(inst, SMIDSW0)); -+ dev_err(inst->dev, "SMIDC: 0x%08x", read_smi_reg(inst, SMIDC)); -+ dev_err(inst->dev, "SMIFD: 0x%08x", read_smi_reg(inst, SMIFD)); -+ dev_err(inst->dev, " "); -+} -+ -+static inline void smi_dump_context(struct bcm2835_smi_instance *inst) -+{ -+ smi_dump_context_labelled(inst, ""); -+} -+ -+static void smi_get_default_settings(struct bcm2835_smi_instance *inst) -+{ -+ struct smi_settings *settings = &inst->settings; -+ -+ settings->data_width = SMI_WIDTH_16BIT; -+ settings->pack_data = true; -+ -+ settings->read_setup_time = 1; -+ settings->read_hold_time = 1; -+ settings->read_pace_time = 1; -+ settings->read_strobe_time = 3; -+ -+ settings->write_setup_time = settings->read_setup_time; -+ settings->write_hold_time = settings->read_hold_time; -+ settings->write_pace_time = settings->read_pace_time; -+ settings->write_strobe_time = settings->read_strobe_time; -+ -+ settings->dma_enable = true; -+ settings->dma_passthrough_enable = false; -+ settings->dma_read_thresh = 0x01; -+ settings->dma_write_thresh = 0x3f; -+ settings->dma_panic_read_thresh = 0x20; -+ settings->dma_panic_write_thresh = 0x20; -+} -+ -+void bcm2835_smi_set_regs_from_settings(struct bcm2835_smi_instance *inst) -+{ -+ struct smi_settings *settings = &inst->settings; -+ int smidsr_temp = 0, smidsw_temp = 0, smics_temp, -+ smidcs_temp, smidc_temp = 0; -+ -+ spin_lock(&inst->transaction_lock); -+ -+ /* temporarily disable the peripheral: */ -+ smics_temp = read_smi_reg(inst, SMICS); -+ write_smi_reg(inst, 0, SMICS); -+ smidcs_temp = read_smi_reg(inst, SMIDCS); -+ write_smi_reg(inst, 0, SMIDCS); -+ -+ if (settings->pack_data) -+ smics_temp |= SMICS_PXLDAT; -+ else -+ smics_temp &= ~SMICS_PXLDAT; -+ -+ SET_BIT_FIELD(smidsr_temp, SMIDSR_RWIDTH, settings->data_width); -+ SET_BIT_FIELD(smidsr_temp, SMIDSR_RSETUP, settings->read_setup_time); -+ SET_BIT_FIELD(smidsr_temp, SMIDSR_RHOLD, settings->read_hold_time); -+ SET_BIT_FIELD(smidsr_temp, SMIDSR_RPACE, settings->read_pace_time); -+ SET_BIT_FIELD(smidsr_temp, SMIDSR_RSTROBE, settings->read_strobe_time); -+ write_smi_reg(inst, smidsr_temp, SMIDSR0); -+ -+ SET_BIT_FIELD(smidsw_temp, SMIDSW_WWIDTH, settings->data_width); -+ if (settings->data_width == SMI_WIDTH_8BIT) -+ smidsw_temp |= SMIDSW_WSWAP; -+ else -+ smidsw_temp &= ~SMIDSW_WSWAP; -+ SET_BIT_FIELD(smidsw_temp, SMIDSW_WSETUP, settings->write_setup_time); -+ SET_BIT_FIELD(smidsw_temp, SMIDSW_WHOLD, settings->write_hold_time); -+ SET_BIT_FIELD(smidsw_temp, SMIDSW_WPACE, settings->write_pace_time); -+ SET_BIT_FIELD(smidsw_temp, SMIDSW_WSTROBE, -+ settings->write_strobe_time); -+ write_smi_reg(inst, smidsw_temp, SMIDSW0); -+ -+ SET_BIT_FIELD(smidc_temp, SMIDC_REQR, settings->dma_read_thresh); -+ SET_BIT_FIELD(smidc_temp, SMIDC_REQW, settings->dma_write_thresh); -+ SET_BIT_FIELD(smidc_temp, SMIDC_PANICR, -+ settings->dma_panic_read_thresh); -+ SET_BIT_FIELD(smidc_temp, SMIDC_PANICW, -+ settings->dma_panic_write_thresh); -+ if (settings->dma_passthrough_enable) { -+ smidc_temp |= SMIDC_DMAP; -+ smidsr_temp |= SMIDSR_RDREQ; -+ write_smi_reg(inst, smidsr_temp, SMIDSR0); -+ smidsw_temp |= SMIDSW_WDREQ; -+ write_smi_reg(inst, smidsw_temp, SMIDSW0); -+ } else -+ smidc_temp &= ~SMIDC_DMAP; -+ if (settings->dma_enable) -+ smidc_temp |= SMIDC_DMAEN; -+ else -+ smidc_temp &= ~SMIDC_DMAEN; -+ -+ write_smi_reg(inst, smidc_temp, SMIDC); -+ -+ /* re-enable (if was previously enabled) */ -+ write_smi_reg(inst, smics_temp, SMICS); -+ write_smi_reg(inst, smidcs_temp, SMIDCS); -+ -+ spin_unlock(&inst->transaction_lock); -+} -+EXPORT_SYMBOL(bcm2835_smi_set_regs_from_settings); -+ -+struct smi_settings *bcm2835_smi_get_settings_from_regs -+ (struct bcm2835_smi_instance *inst) -+{ -+ struct smi_settings *settings = &inst->settings; -+ int smidsr, smidsw, smidc; -+ -+ spin_lock(&inst->transaction_lock); -+ -+ smidsr = read_smi_reg(inst, SMIDSR0); -+ smidsw = read_smi_reg(inst, SMIDSW0); -+ smidc = read_smi_reg(inst, SMIDC); -+ -+ settings->pack_data = (read_smi_reg(inst, SMICS) & SMICS_PXLDAT) ? -+ true : false; -+ -+ settings->data_width = GET_BIT_FIELD(smidsr, SMIDSR_RWIDTH); -+ settings->read_setup_time = GET_BIT_FIELD(smidsr, SMIDSR_RSETUP); -+ settings->read_hold_time = GET_BIT_FIELD(smidsr, SMIDSR_RHOLD); -+ settings->read_pace_time = GET_BIT_FIELD(smidsr, SMIDSR_RPACE); -+ settings->read_strobe_time = GET_BIT_FIELD(smidsr, SMIDSR_RSTROBE); -+ -+ settings->write_setup_time = GET_BIT_FIELD(smidsw, SMIDSW_WSETUP); -+ settings->write_hold_time = GET_BIT_FIELD(smidsw, SMIDSW_WHOLD); -+ settings->write_pace_time = GET_BIT_FIELD(smidsw, SMIDSW_WPACE); -+ settings->write_strobe_time = GET_BIT_FIELD(smidsw, SMIDSW_WSTROBE); -+ -+ settings->dma_read_thresh = GET_BIT_FIELD(smidc, SMIDC_REQR); -+ settings->dma_write_thresh = GET_BIT_FIELD(smidc, SMIDC_REQW); -+ settings->dma_panic_read_thresh = GET_BIT_FIELD(smidc, SMIDC_PANICR); -+ settings->dma_panic_write_thresh = GET_BIT_FIELD(smidc, SMIDC_PANICW); -+ settings->dma_passthrough_enable = (smidc & SMIDC_DMAP) ? true : false; -+ settings->dma_enable = (smidc & SMIDC_DMAEN) ? true : false; -+ -+ spin_unlock(&inst->transaction_lock); -+ -+ return settings; -+} -+EXPORT_SYMBOL(bcm2835_smi_get_settings_from_regs); -+ -+static inline void smi_set_address(struct bcm2835_smi_instance *inst, -+ unsigned int address) -+{ -+ int smia_temp = 0, smida_temp = 0; -+ -+ SET_BIT_FIELD(smia_temp, SMIA_ADDR, address); -+ SET_BIT_FIELD(smida_temp, SMIDA_ADDR, address); -+ -+ /* Write to both address registers - user doesn't care whether we're -+ doing programmed or direct transfers. */ -+ write_smi_reg(inst, smia_temp, SMIA); -+ write_smi_reg(inst, smida_temp, SMIDA); -+} -+ -+static void smi_setup_regs(struct bcm2835_smi_instance *inst) -+{ -+ -+ dev_dbg(inst->dev, "Initialising SMI registers..."); -+ /* Disable the peripheral if already enabled */ -+ write_smi_reg(inst, 0, SMICS); -+ write_smi_reg(inst, 0, SMIDCS); -+ -+ smi_get_default_settings(inst); -+ bcm2835_smi_set_regs_from_settings(inst); -+ smi_set_address(inst, 0); -+ -+ write_smi_reg(inst, read_smi_reg(inst, SMICS) | SMICS_ENABLE, SMICS); -+ write_smi_reg(inst, read_smi_reg(inst, SMIDCS) | SMIDCS_ENABLE, -+ SMIDCS); -+} -+ -+/**************************************************************************** -+* -+* Low-level SMI access functions -+* Other modules should use the exported higher-level functions e.g. -+* bcm2835_smi_write_buf() unless they have a good reason to use these -+* -+***************************************************************************/ -+ -+static inline uint32_t smi_read_single_word(struct bcm2835_smi_instance *inst) -+{ -+ int timeout = 0; -+ -+ write_smi_reg(inst, SMIDCS_ENABLE, SMIDCS); -+ write_smi_reg(inst, SMIDCS_ENABLE | SMIDCS_START, SMIDCS); -+ /* Make sure things happen in the right order...*/ -+ mb(); -+ while (!(read_smi_reg(inst, SMIDCS) & SMIDCS_DONE) && -+ ++timeout < 10000) -+ ; -+ if (timeout < 10000) -+ return read_smi_reg(inst, SMIDD); -+ -+ dev_err(inst->dev, -+ "SMI direct read timed out (is the clock set up correctly?)"); -+ return 0; -+} -+ -+static inline void smi_write_single_word(struct bcm2835_smi_instance *inst, -+ uint32_t data) -+{ -+ int timeout = 0; -+ -+ write_smi_reg(inst, SMIDCS_ENABLE | SMIDCS_WRITE, SMIDCS); -+ write_smi_reg(inst, data, SMIDD); -+ write_smi_reg(inst, SMIDCS_ENABLE | SMIDCS_WRITE | SMIDCS_START, -+ SMIDCS); -+ -+ while (!(read_smi_reg(inst, SMIDCS) & SMIDCS_DONE) && -+ ++timeout < 10000) -+ ; -+ if (timeout >= 10000) -+ dev_err(inst->dev, -+ "SMI direct write timed out (is the clock set up correctly?)"); -+} -+ -+/* Initiates a programmed read into the read FIFO. It is up to the caller to -+ * read data from the FIFO - either via paced DMA transfer, -+ * or polling SMICS_RXD to check whether data is available. -+ * SMICS_ACTIVE will go low upon completion. */ -+static void smi_init_programmed_read(struct bcm2835_smi_instance *inst, -+ int num_transfers) -+{ -+ int smics_temp; -+ -+ /* Disable the peripheral: */ -+ smics_temp = read_smi_reg(inst, SMICS) & ~(SMICS_ENABLE | SMICS_WRITE); -+ write_smi_reg(inst, smics_temp, SMICS); -+ while (read_smi_reg(inst, SMICS) & SMICS_ENABLE) -+ ; -+ -+ /* Program the transfer count: */ -+ write_smi_reg(inst, num_transfers, SMIL); -+ -+ /* re-enable and start: */ -+ smics_temp |= SMICS_ENABLE; -+ write_smi_reg(inst, smics_temp, SMICS); -+ smics_temp |= SMICS_CLEAR; -+ /* Just to be certain: */ -+ mb(); -+ while (read_smi_reg(inst, SMICS) & SMICS_ACTIVE) -+ ; -+ write_smi_reg(inst, smics_temp, SMICS); -+ smics_temp |= SMICS_START; -+ write_smi_reg(inst, smics_temp, SMICS); -+} -+ -+/* Initiates a programmed write sequence, using data from the write FIFO. -+ * It is up to the caller to initiate a DMA transfer before calling, -+ * or use another method to keep the write FIFO topped up. -+ * SMICS_ACTIVE will go low upon completion. -+ */ -+static void smi_init_programmed_write(struct bcm2835_smi_instance *inst, -+ int num_transfers) -+{ -+ int smics_temp; -+ -+ /* Disable the peripheral: */ -+ smics_temp = read_smi_reg(inst, SMICS) & ~SMICS_ENABLE; -+ write_smi_reg(inst, smics_temp, SMICS); -+ while (read_smi_reg(inst, SMICS) & SMICS_ENABLE) -+ ; -+ -+ /* Program the transfer count: */ -+ write_smi_reg(inst, num_transfers, SMIL); -+ -+ /* setup, re-enable and start: */ -+ smics_temp |= SMICS_WRITE | SMICS_ENABLE; -+ write_smi_reg(inst, smics_temp, SMICS); -+ smics_temp |= SMICS_START; -+ write_smi_reg(inst, smics_temp, SMICS); -+} -+ -+/* Initiate a read and then poll FIFO for data, reading out as it appears. */ -+static void smi_read_fifo(struct bcm2835_smi_instance *inst, -+ uint32_t *dest, int n_bytes) -+{ -+ if (read_smi_reg(inst, SMICS) & SMICS_RXD) { -+ smi_dump_context_labelled(inst, -+ "WARNING: read FIFO not empty at start of read call."); -+ while (read_smi_reg(inst, SMICS)) -+ ; -+ } -+ -+ /* Dispatch the read: */ -+ if (inst->settings.data_width == SMI_WIDTH_8BIT) -+ smi_init_programmed_read(inst, n_bytes); -+ else if (inst->settings.data_width == SMI_WIDTH_16BIT) -+ smi_init_programmed_read(inst, n_bytes / 2); -+ else { -+ dev_err(inst->dev, "Unsupported data width for read."); -+ return; -+ } -+ -+ /* Poll FIFO to keep it empty */ -+ while (!(read_smi_reg(inst, SMICS) & SMICS_DONE)) -+ if (read_smi_reg(inst, SMICS) & SMICS_RXD) -+ *dest++ = read_smi_reg(inst, SMID); -+ -+ /* Ensure that the FIFO is emptied */ -+ if (read_smi_reg(inst, SMICS) & SMICS_RXD) { -+ int fifo_count; -+ -+ fifo_count = GET_BIT_FIELD(read_smi_reg(inst, SMIFD), -+ SMIFD_FCNT); -+ while (fifo_count--) -+ *dest++ = read_smi_reg(inst, SMID); -+ } -+ -+ if (!(read_smi_reg(inst, SMICS) & SMICS_DONE)) -+ smi_dump_context_labelled(inst, -+ "WARNING: transaction finished but done bit not set."); -+ -+ if (read_smi_reg(inst, SMICS) & SMICS_RXD) -+ smi_dump_context_labelled(inst, -+ "WARNING: read FIFO not empty at end of read call."); -+ -+} -+ -+/* Initiate a write, and then keep the FIFO topped up. */ -+static void smi_write_fifo(struct bcm2835_smi_instance *inst, -+ uint32_t *src, int n_bytes) -+{ -+ int i, timeout = 0; -+ -+ /* Empty FIFOs if not already so */ -+ if (!(read_smi_reg(inst, SMICS) & SMICS_TXE)) { -+ smi_dump_context_labelled(inst, -+ "WARNING: write fifo not empty at start of write call."); -+ write_smi_reg(inst, read_smi_reg(inst, SMICS) | SMICS_CLEAR, -+ SMICS); -+ } -+ -+ /* Initiate the transfer */ -+ if (inst->settings.data_width == SMI_WIDTH_8BIT) -+ smi_init_programmed_write(inst, n_bytes); -+ else if (inst->settings.data_width == SMI_WIDTH_16BIT) -+ smi_init_programmed_write(inst, n_bytes / 2); -+ else { -+ dev_err(inst->dev, "Unsupported data width for write."); -+ return; -+ } -+ /* Fill the FIFO: */ -+ for (i = 0; i < (n_bytes - 1) / 4 + 1; ++i) { -+ while (!(read_smi_reg(inst, SMICS) & SMICS_TXD)) -+ ; -+ write_smi_reg(inst, *src++, SMID); -+ } -+ /* Busy wait... */ -+ while (!(read_smi_reg(inst, SMICS) & SMICS_DONE) && ++timeout < -+ 1000000) -+ ; -+ if (timeout >= 1000000) -+ smi_dump_context_labelled(inst, -+ "Timed out on write operation!"); -+ if (!(read_smi_reg(inst, SMICS) & SMICS_TXE)) -+ smi_dump_context_labelled(inst, -+ "WARNING: FIFO not empty at end of write operation."); -+} -+ -+/**************************************************************************** -+* -+* SMI DMA operations -+* -+***************************************************************************/ -+ -+/* Disable SMI and put it into the correct direction before doing DMA setup. -+ Stops spurious DREQs during setup. Peripheral is re-enabled by init_*() */ -+static void smi_disable(struct bcm2835_smi_instance *inst, -+ enum dma_transfer_direction direction) -+{ -+ int smics_temp = read_smi_reg(inst, SMICS) & ~SMICS_ENABLE; -+ -+ if (direction == DMA_DEV_TO_MEM) -+ smics_temp &= ~SMICS_WRITE; -+ else -+ smics_temp |= SMICS_WRITE; -+ write_smi_reg(inst, smics_temp, SMICS); -+ while (read_smi_reg(inst, SMICS) & SMICS_ACTIVE) -+ ; -+} -+ -+static struct scatterlist *smi_scatterlist_from_buffer( -+ struct bcm2835_smi_instance *inst, -+ dma_addr_t buf, -+ size_t len, -+ struct scatterlist *sg) -+{ -+ sg_init_table(sg, 1); -+ sg_dma_address(sg) = buf; -+ sg_dma_len(sg) = len; -+ return sg; -+} -+ -+static void smi_dma_callback_user_copy(void *param) -+{ -+ /* Notify the bottom half that a chunk is ready for user copy */ -+ struct bcm2835_smi_instance *inst = -+ (struct bcm2835_smi_instance *)param; -+ -+ up(&inst->bounce.callback_sem); -+} -+ -+/* Creates a descriptor, assigns the given callback, and submits the -+ descriptor to dmaengine. Does not block - can queue up multiple -+ descriptors and then wait for them all to complete. -+ sg_len is the number of control blocks, NOT the number of bytes. -+ dir can be DMA_MEM_TO_DEV or DMA_DEV_TO_MEM. -+ callback can be NULL - in this case it is not called. */ -+static inline struct dma_async_tx_descriptor *smi_dma_submit_sgl( -+ struct bcm2835_smi_instance *inst, -+ struct scatterlist *sgl, -+ size_t sg_len, -+ enum dma_transfer_direction dir, -+ dma_async_tx_callback callback) -+{ -+ struct dma_async_tx_descriptor *desc; -+ -+ desc = dmaengine_prep_slave_sg(inst->dma_chan, -+ sgl, -+ sg_len, -+ dir, -+ DMA_PREP_INTERRUPT | DMA_CTRL_ACK | -+ DMA_PREP_FENCE); -+ if (!desc) { -+ dev_err(inst->dev, "read_sgl: dma slave preparation failed!"); -+ write_smi_reg(inst, read_smi_reg(inst, SMICS) & ~SMICS_ACTIVE, -+ SMICS); -+ while (read_smi_reg(inst, SMICS) & SMICS_ACTIVE) -+ cpu_relax(); -+ write_smi_reg(inst, read_smi_reg(inst, SMICS) | SMICS_ACTIVE, -+ SMICS); -+ return NULL; -+ } -+ desc->callback = callback; -+ desc->callback_param = inst; -+ if (dmaengine_submit(desc) < 0) -+ return NULL; -+ return desc; -+} -+ -+/* NB this function blocks until the transfer is complete */ -+static void -+smi_dma_read_sgl(struct bcm2835_smi_instance *inst, -+ struct scatterlist *sgl, size_t sg_len, size_t n_bytes) -+{ -+ struct dma_async_tx_descriptor *desc; -+ -+ /* Disable SMI and set to read before dispatching DMA - if SMI is in -+ * write mode and TX fifo is empty, it will generate a DREQ which may -+ * cause the read DMA to complete before the SMI read command is even -+ * dispatched! We want to dispatch DMA before SMI read so that reading -+ * is gapless, for logic analyser. -+ */ -+ -+ smi_disable(inst, DMA_DEV_TO_MEM); -+ -+ desc = smi_dma_submit_sgl(inst, sgl, sg_len, DMA_DEV_TO_MEM, NULL); -+ dma_async_issue_pending(inst->dma_chan); -+ -+ if (inst->settings.data_width == SMI_WIDTH_8BIT) -+ smi_init_programmed_read(inst, n_bytes); -+ else -+ smi_init_programmed_read(inst, n_bytes / 2); -+ -+ if (dma_wait_for_async_tx(desc) == DMA_ERROR) -+ smi_dump_context_labelled(inst, "DMA timeout!"); -+} -+ -+static void -+smi_dma_write_sgl(struct bcm2835_smi_instance *inst, -+ struct scatterlist *sgl, size_t sg_len, size_t n_bytes) -+{ -+ struct dma_async_tx_descriptor *desc; -+ -+ if (inst->settings.data_width == SMI_WIDTH_8BIT) -+ smi_init_programmed_write(inst, n_bytes); -+ else -+ smi_init_programmed_write(inst, n_bytes / 2); -+ -+ desc = smi_dma_submit_sgl(inst, sgl, sg_len, DMA_MEM_TO_DEV, NULL); -+ dma_async_issue_pending(inst->dma_chan); -+ -+ if (dma_wait_for_async_tx(desc) == DMA_ERROR) -+ smi_dump_context_labelled(inst, "DMA timeout!"); -+ else -+ /* Wait for SMI to finish our writes */ -+ while (!(read_smi_reg(inst, SMICS) & SMICS_DONE)) -+ cpu_relax(); -+} -+ -+ssize_t bcm2835_smi_user_dma( -+ struct bcm2835_smi_instance *inst, -+ enum dma_transfer_direction dma_dir, -+ char __user *user_ptr, size_t count, -+ struct bcm2835_smi_bounce_info **bounce) -+{ -+ int chunk_no = 0, chunk_size, count_left = count; -+ struct scatterlist *sgl; -+ void (*init_trans_func)(struct bcm2835_smi_instance *, int); -+ -+ spin_lock(&inst->transaction_lock); -+ -+ if (dma_dir == DMA_DEV_TO_MEM) -+ init_trans_func = smi_init_programmed_read; -+ else -+ init_trans_func = smi_init_programmed_write; -+ -+ smi_disable(inst, dma_dir); -+ -+ sema_init(&inst->bounce.callback_sem, 0); -+ if (bounce) -+ *bounce = &inst->bounce; -+ while (count_left) { -+ chunk_size = count_left > DMA_BOUNCE_BUFFER_SIZE ? -+ DMA_BOUNCE_BUFFER_SIZE : count_left; -+ if (chunk_size == DMA_BOUNCE_BUFFER_SIZE) { -+ sgl = -+ &inst->bounce.sgl[chunk_no % DMA_BOUNCE_BUFFER_COUNT]; -+ } else { -+ sgl = smi_scatterlist_from_buffer( -+ inst, -+ inst->bounce.phys[ -+ chunk_no % DMA_BOUNCE_BUFFER_COUNT], -+ chunk_size, -+ &inst->buffer_sgl); -+ } -+ -+ if (!smi_dma_submit_sgl(inst, sgl, 1, dma_dir, -+ smi_dma_callback_user_copy -+ )) { -+ dev_err(inst->dev, "sgl submit failed"); -+ count = 0; -+ goto out; -+ } -+ count_left -= chunk_size; -+ chunk_no++; -+ } -+ dma_async_issue_pending(inst->dma_chan); -+ -+ if (inst->settings.data_width == SMI_WIDTH_8BIT) -+ init_trans_func(inst, count); -+ else if (inst->settings.data_width == SMI_WIDTH_16BIT) -+ init_trans_func(inst, count / 2); -+out: -+ spin_unlock(&inst->transaction_lock); -+ return count; -+} -+EXPORT_SYMBOL(bcm2835_smi_user_dma); -+ -+ -+/**************************************************************************** -+* -+* High level buffer transfer functions - for use by other drivers -+* -+***************************************************************************/ -+ -+/* Buffer must be physically contiguous - i.e. kmalloc, not vmalloc! */ -+void bcm2835_smi_write_buf( -+ struct bcm2835_smi_instance *inst, -+ const void *buf, size_t n_bytes) -+{ -+ int odd_bytes = n_bytes & 0x3; -+ -+ n_bytes -= odd_bytes; -+ -+ spin_lock(&inst->transaction_lock); -+ -+ if (n_bytes > DMA_THRESHOLD_BYTES) { -+ dma_addr_t phy_addr = dma_map_single( -+ inst->dev, -+ (void *)buf, -+ n_bytes, -+ DMA_MEM_TO_DEV); -+ struct scatterlist *sgl = -+ smi_scatterlist_from_buffer(inst, phy_addr, n_bytes, -+ &inst->buffer_sgl); -+ -+ if (!sgl) { -+ smi_dump_context_labelled(inst, -+ "Error: could not create scatterlist for write!"); -+ goto out; -+ } -+ smi_dma_write_sgl(inst, sgl, 1, n_bytes); -+ -+ dma_unmap_single -+ (inst->dev, phy_addr, n_bytes, DMA_MEM_TO_DEV); -+ } else if (n_bytes) { -+ smi_write_fifo(inst, (uint32_t *) buf, n_bytes); -+ } -+ buf += n_bytes; -+ -+ if (inst->settings.data_width == SMI_WIDTH_8BIT) { -+ while (odd_bytes--) -+ smi_write_single_word(inst, *(uint8_t *) (buf++)); -+ } else { -+ while (odd_bytes >= 2) { -+ smi_write_single_word(inst, *(uint16_t *)buf); -+ buf += 2; -+ odd_bytes -= 2; -+ } -+ if (odd_bytes) { -+ /* Reading an odd number of bytes on a 16 bit bus is -+ a user bug. It's kinder to fail early and tell them -+ than to e.g. transparently give them the bottom byte -+ of a 16 bit transfer. */ -+ dev_err(inst->dev, -+ "WARNING: odd number of bytes specified for wide transfer."); -+ dev_err(inst->dev, -+ "At least one byte dropped as a result."); -+ dump_stack(); -+ } -+ } -+out: -+ spin_unlock(&inst->transaction_lock); -+} -+EXPORT_SYMBOL(bcm2835_smi_write_buf); -+ -+void bcm2835_smi_read_buf(struct bcm2835_smi_instance *inst, -+ void *buf, size_t n_bytes) -+{ -+ -+ /* SMI is inherently 32-bit, which causes surprising amounts of mess -+ for bytes % 4 != 0. Easiest to avoid this mess altogether -+ by handling remainder separately. */ -+ int odd_bytes = n_bytes & 0x3; -+ -+ spin_lock(&inst->transaction_lock); -+ n_bytes -= odd_bytes; -+ if (n_bytes > DMA_THRESHOLD_BYTES) { -+ dma_addr_t phy_addr = dma_map_single(inst->dev, -+ buf, n_bytes, -+ DMA_DEV_TO_MEM); -+ struct scatterlist *sgl = smi_scatterlist_from_buffer( -+ inst, phy_addr, n_bytes, -+ &inst->buffer_sgl); -+ if (!sgl) { -+ smi_dump_context_labelled(inst, -+ "Error: could not create scatterlist for read!"); -+ goto out; -+ } -+ smi_dma_read_sgl(inst, sgl, 1, n_bytes); -+ dma_unmap_single(inst->dev, phy_addr, n_bytes, DMA_DEV_TO_MEM); -+ } else if (n_bytes) { -+ smi_read_fifo(inst, (uint32_t *)buf, n_bytes); -+ } -+ buf += n_bytes; -+ -+ if (inst->settings.data_width == SMI_WIDTH_8BIT) { -+ while (odd_bytes--) -+ *((uint8_t *) (buf++)) = smi_read_single_word(inst); -+ } else { -+ while (odd_bytes >= 2) { -+ *(uint16_t *) buf = smi_read_single_word(inst); -+ buf += 2; -+ odd_bytes -= 2; -+ } -+ if (odd_bytes) { -+ dev_err(inst->dev, -+ "WARNING: odd number of bytes specified for wide transfer."); -+ dev_err(inst->dev, -+ "At least one byte dropped as a result."); -+ dump_stack(); -+ } -+ } -+out: -+ spin_unlock(&inst->transaction_lock); -+} -+EXPORT_SYMBOL(bcm2835_smi_read_buf); -+ -+void bcm2835_smi_set_address(struct bcm2835_smi_instance *inst, -+ unsigned int address) -+{ -+ spin_lock(&inst->transaction_lock); -+ smi_set_address(inst, address); -+ spin_unlock(&inst->transaction_lock); -+} -+EXPORT_SYMBOL(bcm2835_smi_set_address); -+ -+struct bcm2835_smi_instance *bcm2835_smi_get(struct device_node *node) -+{ -+ struct platform_device *pdev; -+ -+ if (!node) -+ return NULL; -+ -+ pdev = of_find_device_by_node(node); -+ if (!pdev) -+ return NULL; -+ -+ return platform_get_drvdata(pdev); -+} -+EXPORT_SYMBOL(bcm2835_smi_get); -+ -+/**************************************************************************** -+* -+* bcm2835_smi_probe - called when the driver is loaded. -+* -+***************************************************************************/ -+ -+static int bcm2835_smi_dma_setup(struct bcm2835_smi_instance *inst) -+{ -+ int i, rv = 0; -+ -+ inst->dma_chan = dma_request_slave_channel(inst->dev, "rx-tx"); -+ -+ inst->dma_config.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; -+ inst->dma_config.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; -+ inst->dma_config.src_addr = inst->smi_regs_busaddr + SMID; -+ inst->dma_config.dst_addr = inst->dma_config.src_addr; -+ /* Direction unimportant - always overridden by prep_slave_sg */ -+ inst->dma_config.direction = DMA_DEV_TO_MEM; -+ dmaengine_slave_config(inst->dma_chan, &inst->dma_config); -+ /* Alloc and map bounce buffers */ -+ for (i = 0; i < DMA_BOUNCE_BUFFER_COUNT; ++i) { -+ inst->bounce.buffer[i] = -+ dmam_alloc_coherent(inst->dev, DMA_BOUNCE_BUFFER_SIZE, -+ &inst->bounce.phys[i], -+ GFP_KERNEL); -+ if (!inst->bounce.buffer[i]) { -+ dev_err(inst->dev, "Could not allocate buffer!"); -+ rv = -ENOMEM; -+ break; -+ } -+ smi_scatterlist_from_buffer( -+ inst, -+ inst->bounce.phys[i], -+ DMA_BOUNCE_BUFFER_SIZE, -+ &inst->bounce.sgl[i] -+ ); -+ } -+ -+ return rv; -+} -+ -+static int bcm2835_smi_probe(struct platform_device *pdev) -+{ -+ int err; -+ struct device *dev = &pdev->dev; -+ struct device_node *node = dev->of_node; -+ struct resource *ioresource; -+ struct bcm2835_smi_instance *inst; -+ -+ /* 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); -+ -+ err = bcm2835_smi_dma_setup(inst); -+ if (err) -+ return err; -+ -+ /* Finally, do peripheral setup */ -+ -+ smi_setup_clock(inst); -+ smi_setup_regs(inst); -+ -+ platform_set_drvdata(pdev, inst); -+ -+ dev_info(inst->dev, "initialised"); -+ -+ return 0; -+} -+ -+/**************************************************************************** -+* -+* bcm2835_smi_remove - called when the driver is unloaded. -+* -+***************************************************************************/ -+ -+static int bcm2835_smi_remove(struct platform_device *pdev) -+{ -+ struct bcm2835_smi_instance *inst = platform_get_drvdata(pdev); -+ struct device *dev = inst->dev; -+ -+ dev_info(dev, "SMI device removed - OK"); -+ return 0; -+} -+ -+/**************************************************************************** -+* -+* Register the driver with device tree -+* -+***************************************************************************/ -+ -+static const struct of_device_id bcm2835_smi_of_match[] = { -+ {.compatible = "brcm,bcm2835-smi",}, -+ { /* sentinel */ }, -+}; -+ -+MODULE_DEVICE_TABLE(of, bcm2835_smi_of_match); -+ -+static struct platform_driver bcm2835_smi_driver = { -+ .probe = bcm2835_smi_probe, -+ .remove = bcm2835_smi_remove, -+ .driver = { -+ .name = DRIVER_NAME, -+ .owner = THIS_MODULE, -+ .of_match_table = bcm2835_smi_of_match, -+ }, -+}; -+ -+module_platform_driver(bcm2835_smi_driver); -+ -+MODULE_ALIAS("platform:smi-bcm2835"); -+MODULE_LICENSE("GPL"); -+MODULE_DESCRIPTION("Device driver for BCM2835's secondary memory interface"); -+MODULE_AUTHOR("Luke Wren <luke@raspberrypi.org>"); ---- /dev/null -+++ b/include/linux/broadcom/bcm2835_smi.h -@@ -0,0 +1,391 @@ -+/** -+ * Declarations and definitions for Broadcom's Secondary Memory Interface -+ * -+ * Written by Luke Wren <luke@raspberrypi.org> -+ * Copyright (c) 2015, Raspberry Pi (Trading) Ltd. -+ * Copyright (c) 2010-2012 Broadcom. All rights reserved. -+ * -+ * Redistribution and use in source and binary forms, with or without -+ * modification, are permitted provided that the following conditions -+ * are met: -+ * 1. Redistributions of source code must retain the above copyright -+ * notice, this list of conditions, and the following disclaimer, -+ * without modification. -+ * 2. Redistributions in binary form must reproduce the above copyright -+ * notice, this list of conditions and the following disclaimer in the -+ * documentation and/or other materials provided with the distribution. -+ * 3. The names of the above-listed copyright holders may not be used -+ * to endorse or promote products derived from this software without -+ * specific prior written permission. -+ * -+ * ALTERNATIVELY, this software may be distributed under the terms of the -+ * GNU General Public License ("GPL") version 2, as published by the Free -+ * Software Foundation. -+ * -+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS -+ * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, -+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR -+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR -+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, -+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, -+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR -+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF -+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING -+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS -+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. -+ */ -+ -+#ifndef BCM2835_SMI_H -+#define BCM2835_SMI_H -+ -+#include <linux/ioctl.h> -+ -+#ifndef __KERNEL__ -+#include <stdint.h> -+#include <stdbool.h> -+#endif -+ -+#define BCM2835_SMI_IOC_MAGIC 0x1 -+#define BCM2835_SMI_INVALID_HANDLE (~0) -+ -+/* IOCTLs 0x100...0x1ff are not device-specific - we can use them */ -+#define BCM2835_SMI_IOC_GET_SETTINGS _IO(BCM2835_SMI_IOC_MAGIC, 0) -+#define BCM2835_SMI_IOC_WRITE_SETTINGS _IO(BCM2835_SMI_IOC_MAGIC, 1) -+#define BCM2835_SMI_IOC_ADDRESS _IO(BCM2835_SMI_IOC_MAGIC, 2) -+#define BCM2835_SMI_IOC_MAX 2 -+ -+#define SMI_WIDTH_8BIT 0 -+#define SMI_WIDTH_16BIT 1 -+#define SMI_WIDTH_9BIT 2 -+#define SMI_WIDTH_18BIT 3 -+ -+/* max number of bytes where DMA will not be used */ -+#define DMA_THRESHOLD_BYTES 128 -+#define DMA_BOUNCE_BUFFER_SIZE (1024 * 1024 / 2) -+#define DMA_BOUNCE_BUFFER_COUNT 3 -+ -+ -+struct smi_settings { -+ int data_width; -+ /* Whether or not to pack multiple SMI transfers into a -+ single 32 bit FIFO word */ -+ bool pack_data; -+ -+ /* Timing for reads (writes the same but for WE) -+ * -+ * OE ----------+ +-------------------- -+ * | | -+ * +----------+ -+ * SD -<==============================>----------- -+ * SA -<=========================================>- -+ * <-setup-> <-strobe -> <-hold -> <- pace -> -+ */ -+ -+ int read_setup_time; -+ int read_hold_time; -+ int read_pace_time; -+ int read_strobe_time; -+ -+ int write_setup_time; -+ int write_hold_time; -+ int write_pace_time; -+ int write_strobe_time; -+ -+ bool dma_enable; /* DREQs */ -+ bool dma_passthrough_enable; /* External DREQs */ -+ int dma_read_thresh; -+ int dma_write_thresh; -+ int dma_panic_read_thresh; -+ int dma_panic_write_thresh; -+}; -+ -+/**************************************************************************** -+* -+* Declare exported SMI functions -+* -+***************************************************************************/ -+ -+#ifdef __KERNEL__ -+ -+#include <linux/dmaengine.h> /* for enum dma_transfer_direction */ -+#include <linux/of.h> -+#include <linux/semaphore.h> -+ -+struct bcm2835_smi_instance; -+ -+struct bcm2835_smi_bounce_info { -+ struct semaphore callback_sem; -+ void *buffer[DMA_BOUNCE_BUFFER_COUNT]; -+ dma_addr_t phys[DMA_BOUNCE_BUFFER_COUNT]; -+ struct scatterlist sgl[DMA_BOUNCE_BUFFER_COUNT]; -+}; -+ -+ -+void bcm2835_smi_set_regs_from_settings(struct bcm2835_smi_instance *); -+ -+struct smi_settings *bcm2835_smi_get_settings_from_regs( -+ struct bcm2835_smi_instance *inst); -+ -+void bcm2835_smi_write_buf( -+ struct bcm2835_smi_instance *inst, -+ const void *buf, -+ size_t n_bytes); -+ -+void bcm2835_smi_read_buf( -+ struct bcm2835_smi_instance *inst, -+ void *buf, -+ size_t n_bytes); -+ -+void bcm2835_smi_set_address(struct bcm2835_smi_instance *inst, -+ unsigned int address); -+ -+ssize_t bcm2835_smi_user_dma( -+ struct bcm2835_smi_instance *inst, -+ enum dma_transfer_direction dma_dir, -+ char __user *user_ptr, -+ size_t count, -+ struct bcm2835_smi_bounce_info **bounce); -+ -+struct bcm2835_smi_instance *bcm2835_smi_get(struct device_node *node); -+ -+#endif /* __KERNEL__ */ -+ -+/**************************************************************** -+* -+* Implementation-only declarations -+* -+****************************************************************/ -+ -+#ifdef BCM2835_SMI_IMPLEMENTATION -+ -+/* Clock manager registers for SMI clock: */ -+#define CM_SMI_BASE_ADDRESS ((BCM2708_PERI_BASE) + 0x1010b0) -+/* Clock manager "password" to protect registers from spurious writes */ -+#define CM_PWD (0x5a << 24) -+ -+#define CM_SMI_CTL 0x00 -+#define CM_SMI_DIV 0x04 -+ -+#define CM_SMI_CTL_FLIP (1 << 8) -+#define CM_SMI_CTL_BUSY (1 << 7) -+#define CM_SMI_CTL_KILL (1 << 5) -+#define CM_SMI_CTL_ENAB (1 << 4) -+#define CM_SMI_CTL_SRC_MASK (0xf) -+#define CM_SMI_CTL_SRC_OFFS (0) -+ -+#define CM_SMI_DIV_DIVI_MASK (0xf << 12) -+#define CM_SMI_DIV_DIVI_OFFS (12) -+#define CM_SMI_DIV_DIVF_MASK (0xff << 4) -+#define CM_SMI_DIV_DIVF_OFFS (4) -+ -+/* SMI register mapping:*/ -+#define SMI_BASE_ADDRESS ((BCM2708_PERI_BASE) + 0x600000) -+ -+#define SMICS 0x00 /* control + status register */ -+#define SMIL 0x04 /* length/count (n external txfers) */ -+#define SMIA 0x08 /* address register */ -+#define SMID 0x0c /* data register */ -+#define SMIDSR0 0x10 /* device 0 read settings */ -+#define SMIDSW0 0x14 /* device 0 write settings */ -+#define SMIDSR1 0x18 /* device 1 read settings */ -+#define SMIDSW1 0x1c /* device 1 write settings */ -+#define SMIDSR2 0x20 /* device 2 read settings */ -+#define SMIDSW2 0x24 /* device 2 write settings */ -+#define SMIDSR3 0x28 /* device 3 read settings */ -+#define SMIDSW3 0x2c /* device 3 write settings */ -+#define SMIDC 0x30 /* DMA control registers */ -+#define SMIDCS 0x34 /* direct control/status register */ -+#define SMIDA 0x38 /* direct address register */ -+#define SMIDD 0x3c /* direct data registers */ -+#define SMIFD 0x40 /* FIFO debug register */ -+ -+ -+ -+/* Control and Status register bits: -+ * SMICS_RXF : RX fifo full: 1 when RX fifo is full -+ * SMICS_TXE : TX fifo empty: 1 when empty. -+ * SMICS_RXD : RX fifo contains data: 1 when there is data. -+ * SMICS_TXD : TX fifo can accept data: 1 when true. -+ * SMICS_RXR : RX fifo needs reading: 1 when fifo more than 3/4 full, or -+ * when "DONE" and fifo not emptied. -+ * SMICS_TXW : TX fifo needs writing: 1 when less than 1/4 full. -+ * SMICS_AFERR : AXI FIFO error: 1 when fifo read when empty or written -+ * when full. Write 1 to clear. -+ * SMICS_EDREQ : 1 when external DREQ received. -+ * SMICS_PXLDAT : Pixel data: write 1 to enable pixel transfer modes. -+ * SMICS_SETERR : 1 if there was an error writing to setup regs (e.g. -+ * tx was in progress). Write 1 to clear. -+ * SMICS_PVMODE : Set to 1 to enable pixel valve mode. -+ * SMICS_INTR : Set to 1 to enable interrupt on RX. -+ * SMICS_INTT : Set to 1 to enable interrupt on TX. -+ * SMICS_INTD : Set to 1 to enable interrupt on DONE condition. -+ * SMICS_TEEN : Tear effect mode enabled: Programmed transfers will wait -+ * for a TE trigger before writing. -+ * SMICS_PAD1 : Padding settings for external transfers. For writes: the -+ * number of bytes initially written to the TX fifo that -+ * SMICS_PAD0 : should be ignored. For reads: the number of bytes that will -+ * be read before the data, and should be dropped. -+ * SMICS_WRITE : Transfer direction: 1 = write to external device, 0 = read -+ * SMICS_CLEAR : Write 1 to clear the FIFOs. -+ * SMICS_START : Write 1 to start the programmed transfer. -+ * SMICS_ACTIVE : Reads as 1 when a programmed transfer is underway. -+ * SMICS_DONE : Reads as 1 when transfer finished. For RX, not set until -+ * FIFO emptied. -+ * SMICS_ENABLE : Set to 1 to enable the SMI peripheral, 0 to disable. -+ */ -+ -+#define SMICS_RXF (1 << 31) -+#define SMICS_TXE (1 << 30) -+#define SMICS_RXD (1 << 29) -+#define SMICS_TXD (1 << 28) -+#define SMICS_RXR (1 << 27) -+#define SMICS_TXW (1 << 26) -+#define SMICS_AFERR (1 << 25) -+#define SMICS_EDREQ (1 << 15) -+#define SMICS_PXLDAT (1 << 14) -+#define SMICS_SETERR (1 << 13) -+#define SMICS_PVMODE (1 << 12) -+#define SMICS_INTR (1 << 11) -+#define SMICS_INTT (1 << 10) -+#define SMICS_INTD (1 << 9) -+#define SMICS_TEEN (1 << 8) -+#define SMICS_PAD1 (1 << 7) -+#define SMICS_PAD0 (1 << 6) -+#define SMICS_WRITE (1 << 5) -+#define SMICS_CLEAR (1 << 4) -+#define SMICS_START (1 << 3) -+#define SMICS_ACTIVE (1 << 2) -+#define SMICS_DONE (1 << 1) -+#define SMICS_ENABLE (1 << 0) -+ -+/* Address register bits: */ -+ -+#define SMIA_DEVICE_MASK ((1 << 9) | (1 << 8)) -+#define SMIA_DEVICE_OFFS (8) -+#define SMIA_ADDR_MASK (0x3f) /* bits 5 -> 0 */ -+#define SMIA_ADDR_OFFS (0) -+ -+/* DMA control register bits: -+ * SMIDC_DMAEN : DMA enable: set 1: DMA requests will be issued. -+ * SMIDC_DMAP : DMA passthrough: when set to 0, top two data pins are used by -+ * SMI as usual. When set to 1, the top two pins are used for -+ * external DREQs: pin 16 read request, 17 write. -+ * SMIDC_PANIC* : Threshold at which DMA will panic during read/write. -+ * SMIDC_REQ* : Threshold at which DMA will generate a DREQ. -+ */ -+ -+#define SMIDC_DMAEN (1 << 28) -+#define SMIDC_DMAP (1 << 24) -+#define SMIDC_PANICR_MASK (0x3f << 18) -+#define SMIDC_PANICR_OFFS (18) -+#define SMIDC_PANICW_MASK (0x3f << 12) -+#define SMIDC_PANICW_OFFS (12) -+#define SMIDC_REQR_MASK (0x3f << 6) -+#define SMIDC_REQR_OFFS (6) -+#define SMIDC_REQW_MASK (0x3f) -+#define SMIDC_REQW_OFFS (0) -+ -+/* Device settings register bits: same for all 4 (or 3?) device register sets. -+ * Device read settings: -+ * SMIDSR_RWIDTH : Read transfer width. 00 = 8bit, 01 = 16bit, -+ * 10 = 18bit, 11 = 9bit. -+ * SMIDSR_RSETUP : Read setup time: number of core cycles between chip -+ * select/address and read strobe. Min 1, max 64. -+ * SMIDSR_MODE68 : 1 for System 68 mode (i.e. enable + direction pins, -+ * rather than OE + WE pin) -+ * SMIDSR_FSETUP : If set to 1, setup time only applies to first -+ * transfer after address change. -+ * SMIDSR_RHOLD : Number of core cycles between read strobe going -+ * inactive and CS/address going inactive. Min 1, max 64 -+ * SMIDSR_RPACEALL : When set to 1, this device's RPACE value will always -+ * be used for the next transaction, even if it is not -+ * to this device. -+ * SMIDSR_RPACE : Number of core cycles spent waiting between CS -+ * deassert and start of next transfer. Min 1, max 128 -+ * SMIDSR_RDREQ : 1 = use external DMA request on SD16 to pace reads -+ * from device. Must also set DMAP in SMICS. -+ * SMIDSR_RSTROBE : Number of cycles to assert the read strobe. -+ * min 1, max 128. -+ */ -+#define SMIDSR_RWIDTH_MASK ((1<<31)|(1<<30)) -+#define SMIDSR_RWIDTH_OFFS (30) -+#define SMIDSR_RSETUP_MASK (0x3f << 24) -+#define SMIDSR_RSETUP_OFFS (24) -+#define SMIDSR_MODE68 (1 << 23) -+#define SMIDSR_FSETUP (1 << 22) -+#define SMIDSR_RHOLD_MASK (0x3f << 16) -+#define SMIDSR_RHOLD_OFFS (16) -+#define SMIDSR_RPACEALL (1 << 15) -+#define SMIDSR_RPACE_MASK (0x7f << 8) -+#define SMIDSR_RPACE_OFFS (8) -+#define SMIDSR_RDREQ (1 << 7) -+#define SMIDSR_RSTROBE_MASK (0x7f) -+#define SMIDSR_RSTROBE_OFFS (0) -+ -+/* Device write settings: -+ * SMIDSW_WWIDTH : Write transfer width. 00 = 8bit, 01 = 16bit, -+ * 10= 18bit, 11 = 9bit. -+ * SMIDSW_WSETUP : Number of cycles between CS assert and write strobe. -+ * Min 1, max 64. -+ * SMIDSW_WFORMAT : Pixel format of input. 0 = 16bit RGB 565, -+ * 1 = 32bit RGBA 8888 -+ * SMIDSW_WSWAP : 1 = swap pixel data bits. (Use with SMICS_PXLDAT) -+ * SMIDSW_WHOLD : Time between WE deassert and CS deassert. 1 to 64 -+ * SMIDSW_WPACEALL : 1: this device's WPACE will be used for the next -+ * transfer, regardless of that transfer's device. -+ * SMIDSW_WPACE : Cycles between CS deassert and next CS assert. -+ * Min 1, max 128 -+ * SMIDSW_WDREQ : Use external DREQ on pin 17 to pace writes. DMAP must -+ * be set in SMICS. -+ * SMIDSW_WSTROBE : Number of cycles to assert the write strobe. -+ * Min 1, max 128 -+ */ -+#define SMIDSW_WWIDTH_MASK ((1<<31)|(1<<30)) -+#define SMIDSW_WWIDTH_OFFS (30) -+#define SMIDSW_WSETUP_MASK (0x3f << 24) -+#define SMIDSW_WSETUP_OFFS (24) -+#define SMIDSW_WFORMAT (1 << 23) -+#define SMIDSW_WSWAP (1 << 22) -+#define SMIDSW_WHOLD_MASK (0x3f << 16) -+#define SMIDSW_WHOLD_OFFS (16) -+#define SMIDSW_WPACEALL (1 << 15) -+#define SMIDSW_WPACE_MASK (0x7f << 8) -+#define SMIDSW_WPACE_OFFS (8) -+#define SMIDSW_WDREQ (1 << 7) -+#define SMIDSW_WSTROBE_MASK (0x7f) -+#define SMIDSW_WSTROBE_OFFS (0) -+ -+/* Direct transfer control + status register -+ * SMIDCS_WRITE : Direction of transfer: 1 -> write, 0 -> read -+ * SMIDCS_DONE : 1 when a transfer has finished. Write 1 to clear. -+ * SMIDCS_START : Write 1 to start a transfer, if one is not already underway. -+ * SMIDCE_ENABLE: Write 1 to enable SMI in direct mode. -+ */ -+ -+#define SMIDCS_WRITE (1 << 3) -+#define SMIDCS_DONE (1 << 2) -+#define SMIDCS_START (1 << 1) -+#define SMIDCS_ENABLE (1 << 0) -+ -+/* Direct transfer address register -+ * SMIDA_DEVICE : Indicates which of the device settings banks should be used. -+ * SMIDA_ADDR : The value to be asserted on the address pins. -+ */ -+ -+#define SMIDA_DEVICE_MASK ((1<<9)|(1<<8)) -+#define SMIDA_DEVICE_OFFS (8) -+#define SMIDA_ADDR_MASK (0x3f) -+#define SMIDA_ADDR_OFFS (0) -+ -+/* FIFO debug register -+ * SMIFD_FLVL : The high-tide mark of FIFO count during the most recent txfer -+ * SMIFD_FCNT : The current FIFO count. -+ */ -+#define SMIFD_FLVL_MASK (0x3f << 8) -+#define SMIFD_FLVL_OFFS (8) -+#define SMIFD_FCNT_MASK (0x3f) -+#define SMIFD_FCNT_OFFS (0) -+ -+#endif /* BCM2835_SMI_IMPLEMENTATION */ -+ -+#endif /* BCM2835_SMI_H */ |