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, 2028 insertions, 0 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 new file mode 100644 index 0000000..8678f9a --- /dev/null +++ b/target/linux/brcm2708/patches-4.1/0189-Add-SMI-driver.patch @@ -0,0 +1,2028 @@ +From d0576255447f0e2af80396e105f77e4a6fc981e2 Mon Sep 17 00:00:00 2001 +From: Luke Wren <wren6991@gmail.com> +Date: Sat, 5 Sep 2015 01:14:45 +0100 +Subject: [PATCH 189/203] 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 */ |