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-rw-r--r--drivers/media/video/Kconfig9
-rw-r--r--drivers/media/video/Makefile2
-rw-r--r--drivers/media/video/cafe_ccic-regs.h160
-rw-r--r--drivers/media/video/cafe_ccic.c2237
4 files changed, 2408 insertions, 0 deletions
diff --git a/drivers/media/video/Kconfig b/drivers/media/video/Kconfig
index b8fde5cf473..4ea1d0ebf5f 100644
--- a/drivers/media/video/Kconfig
+++ b/drivers/media/video/Kconfig
@@ -670,6 +670,15 @@ config VIDEO_M32R_AR_M64278
To compile this driver as a module, choose M here: the
module will be called arv.
+config VIDEO_CAFE_CCIC
+ tristate "Marvell 88ALP01 (Cafe) CMOS Camera Controller support"
+ depends on I2C && VIDEO_V4L2
+ select VIDEO_OV7670
+ ---help---
+ This is a video4linux2 driver for the Marvell 88ALP01 integrated
+ CMOS camera controller. This is the controller found on first-
+ generation OLPC systems.
+
#
# USB Multimedia device configuration
#
diff --git a/drivers/media/video/Makefile b/drivers/media/video/Makefile
index af57abce8a6..8ff787a4cf6 100644
--- a/drivers/media/video/Makefile
+++ b/drivers/media/video/Makefile
@@ -92,6 +92,8 @@ obj-$(CONFIG_VIDEO_UPD64031A) += upd64031a.o
obj-$(CONFIG_VIDEO_UPD64083) += upd64083.o
obj-$(CONFIG_VIDEO_CX2341X) += cx2341x.o
+obj-$(CONFIG_VIDEO_CAFE_CCIC) += cafe_ccic.o
+
obj-$(CONFIG_USB_DABUSB) += dabusb.o
obj-$(CONFIG_USB_OV511) += ov511.o
obj-$(CONFIG_USB_SE401) += se401.o
diff --git a/drivers/media/video/cafe_ccic-regs.h b/drivers/media/video/cafe_ccic-regs.h
new file mode 100644
index 00000000000..b2c22a0d664
--- /dev/null
+++ b/drivers/media/video/cafe_ccic-regs.h
@@ -0,0 +1,160 @@
+/*
+ * Register definitions for the m88alp01 camera interface. Offsets in bytes
+ * as given in the spec.
+ *
+ * Copyright 2006 One Laptop Per Child Association, Inc.
+ *
+ * Written by Jonathan Corbet, corbet@lwn.net.
+ *
+ * This file may be distributed under the terms of the GNU General
+ * Public License, version 2.
+ */
+#define REG_Y0BAR 0x00
+#define REG_Y1BAR 0x04
+#define REG_Y2BAR 0x08
+/* ... */
+
+#define REG_IMGPITCH 0x24 /* Image pitch register */
+#define IMGP_YP_SHFT 2 /* Y pitch params */
+#define IMGP_YP_MASK 0x00003ffc /* Y pitch field */
+#define IMGP_UVP_SHFT 18 /* UV pitch (planar) */
+#define IMGP_UVP_MASK 0x3ffc0000
+#define REG_IRQSTATRAW 0x28 /* RAW IRQ Status */
+#define IRQ_EOF0 0x00000001 /* End of frame 0 */
+#define IRQ_EOF1 0x00000002 /* End of frame 1 */
+#define IRQ_EOF2 0x00000004 /* End of frame 2 */
+#define IRQ_SOF0 0x00000008 /* Start of frame 0 */
+#define IRQ_SOF1 0x00000010 /* Start of frame 1 */
+#define IRQ_SOF2 0x00000020 /* Start of frame 2 */
+#define IRQ_OVERFLOW 0x00000040 /* FIFO overflow */
+#define IRQ_TWSIW 0x00010000 /* TWSI (smbus) write */
+#define IRQ_TWSIR 0x00020000 /* TWSI read */
+#define IRQ_TWSIE 0x00040000 /* TWSI error */
+#define TWSIIRQS (IRQ_TWSIW|IRQ_TWSIR|IRQ_TWSIE)
+#define FRAMEIRQS (IRQ_EOF0|IRQ_EOF1|IRQ_EOF2|IRQ_SOF0|IRQ_SOF1|IRQ_SOF2)
+#define ALLIRQS (TWSIIRQS|FRAMEIRQS|IRQ_OVERFLOW)
+#define REG_IRQMASK 0x2c /* IRQ mask - same bits as IRQSTAT */
+#define REG_IRQSTAT 0x30 /* IRQ status / clear */
+
+#define REG_IMGSIZE 0x34 /* Image size */
+#define IMGSZ_V_MASK 0x1fff0000
+#define IMGSZ_V_SHIFT 16
+#define IMGSZ_H_MASK 0x00003fff
+#define REG_IMGOFFSET 0x38 /* IMage offset */
+
+#define REG_CTRL0 0x3c /* Control 0 */
+#define C0_ENABLE 0x00000001 /* Makes the whole thing go */
+
+/* Mask for all the format bits */
+#define C0_DF_MASK 0x00fffffc /* Bits 2-23 */
+
+/* RGB ordering */
+#define C0_RGB4_RGBX 0x00000000
+#define C0_RGB4_XRGB 0x00000004
+#define C0_RGB4_BGRX 0x00000008
+#define C0_RGB4_XBGR 0x0000000c
+#define C0_RGB5_RGGB 0x00000000
+#define C0_RGB5_GRBG 0x00000004
+#define C0_RGB5_GBRG 0x00000008
+#define C0_RGB5_BGGR 0x0000000c
+
+/* Spec has two fields for DIN and DOUT, but they must match, so
+ combine them here. */
+#define C0_DF_YUV 0x00000000 /* Data is YUV */
+#define C0_DF_RGB 0x000000a0 /* ... RGB */
+#define C0_DF_BAYER 0x00000140 /* ... Bayer */
+/* 8-8-8 must be missing from the below - ask */
+#define C0_RGBF_565 0x00000000
+#define C0_RGBF_444 0x00000800
+#define C0_RGB_BGR 0x00001000 /* Blue comes first */
+#define C0_YUV_PLANAR 0x00000000 /* YUV 422 planar format */
+#define C0_YUV_PACKED 0x00008000 /* YUV 422 packed */
+#define C0_YUV_420PL 0x0000a000 /* YUV 420 planar */
+/* Think that 420 packed must be 111 - ask */
+#define C0_YUVE_YUYV 0x00000000 /* Y1CbY0Cr */
+#define C0_YUVE_YVYU 0x00010000 /* Y1CrY0Cb */
+#define C0_YUVE_VYUY 0x00020000 /* CrY1CbY0 */
+#define C0_YUVE_UYVY 0x00030000 /* CbY1CrY0 */
+#define C0_YUVE_XYUV 0x00000000 /* 420: .YUV */
+#define C0_YUVE_XYVU 0x00010000 /* 420: .YVU */
+#define C0_YUVE_XUVY 0x00020000 /* 420: .UVY */
+#define C0_YUVE_XVUY 0x00030000 /* 420: .VUY */
+/* Bayer bits 18,19 if needed */
+#define C0_HPOL_LOW 0x01000000 /* HSYNC polarity active low */
+#define C0_VPOL_LOW 0x02000000 /* VSYNC polarity active low */
+#define C0_VCLK_LOW 0x04000000 /* VCLK on falling edge */
+#define C0_DOWNSCALE 0x08000000 /* Enable downscaler */
+#define C0_SIFM_MASK 0xc0000000 /* SIF mode bits */
+#define C0_SIF_HVSYNC 0x00000000 /* Use H/VSYNC */
+#define CO_SOF_NOSYNC 0x40000000 /* Use inband active signaling */
+
+
+#define REG_CTRL1 0x40 /* Control 1 */
+#define C1_444ALPHA 0x00f00000 /* Alpha field in RGB444 */
+#define C1_ALPHA_SHFT 20
+#define C1_DMAB32 0x00000000 /* 32-byte DMA burst */
+#define C1_DMAB16 0x02000000 /* 16-byte DMA burst */
+#define C1_DMAB64 0x04000000 /* 64-byte DMA burst */
+#define C1_DMAB_MASK 0x06000000
+#define C1_TWOBUFS 0x08000000 /* Use only two DMA buffers */
+#define C1_PWRDWN 0x10000000 /* Power down */
+
+#define REG_CLKCTRL 0x88 /* Clock control */
+#define CLK_DIV_MASK 0x0000ffff /* Upper bits RW "reserved" */
+
+#define REG_GPR 0xb4 /* General purpose register. This
+ controls inputs to the power and reset
+ pins on the OV7670 used with OLPC;
+ other deployments could differ. */
+#define GPR_C1EN 0x00000020 /* Pad 1 (power down) enable */
+#define GPR_C0EN 0x00000010 /* Pad 0 (reset) enable */
+#define GPR_C1 0x00000002 /* Control 1 value */
+/*
+ * Control 0 is wired to reset on OLPC machines. For ov7x sensors,
+ * it is active low, for 0v6x, instead, it's active high. What
+ * fun.
+ */
+#define GPR_C0 0x00000001 /* Control 0 value */
+
+#define REG_TWSIC0 0xb8 /* TWSI (smbus) control 0 */
+#define TWSIC0_EN 0x00000001 /* TWSI enable */
+#define TWSIC0_MODE 0x00000002 /* 1 = 16-bit, 0 = 8-bit */
+#define TWSIC0_SID 0x000003fc /* Slave ID */
+#define TWSIC0_SID_SHIFT 2
+#define TWSIC0_CLKDIV 0x0007fc00 /* Clock divider */
+#define TWSIC0_MASKACK 0x00400000 /* Mask ack from sensor */
+#define TWSIC0_OVMAGIC 0x00800000 /* Make it work on OV sensors */
+
+#define REG_TWSIC1 0xbc /* TWSI control 1 */
+#define TWSIC1_DATA 0x0000ffff /* Data to/from camchip */
+#define TWSIC1_ADDR 0x00ff0000 /* Address (register) */
+#define TWSIC1_ADDR_SHIFT 16
+#define TWSIC1_READ 0x01000000 /* Set for read op */
+#define TWSIC1_WSTAT 0x02000000 /* Write status */
+#define TWSIC1_RVALID 0x04000000 /* Read data valid */
+#define TWSIC1_ERROR 0x08000000 /* Something screwed up */
+
+
+#define REG_UBAR 0xc4 /* Upper base address register */
+
+/*
+ * Here's the weird global control registers which are said to live
+ * way up here.
+ */
+#define REG_GL_CSR 0x3004 /* Control/status register */
+#define GCSR_SRS 0x00000001 /* SW Reset set */
+#define GCSR_SRC 0x00000002 /* SW Reset clear */
+#define GCSR_MRS 0x00000004 /* Master reset set */
+#define GCSR_MRC 0x00000008 /* HW Reset clear */
+#define GCSR_CCIC_EN 0x00004000 /* CCIC Clock enable */
+#define REG_GL_IMASK 0x300c /* Interrupt mask register */
+#define GIMSK_CCIC_EN 0x00000004 /* CCIC Interrupt enable */
+
+#define REG_LEN REG_GL_IMASK + 4
+
+
+/*
+ * Useful stuff that probably belongs somewhere global.
+ */
+#define VGA_WIDTH 640
+#define VGA_HEIGHT 480
diff --git a/drivers/media/video/cafe_ccic.c b/drivers/media/video/cafe_ccic.c
new file mode 100644
index 00000000000..2026c4983b2
--- /dev/null
+++ b/drivers/media/video/cafe_ccic.c
@@ -0,0 +1,2237 @@
+/*
+ * A driver for the CMOS camera controller in the Marvell 88ALP01 "cafe"
+ * multifunction chip. Currently works with the Omnivision OV7670
+ * sensor.
+ *
+ * Copyright 2006 One Laptop Per Child Association, Inc.
+ *
+ * Written by Jonathan Corbet, corbet@lwn.net.
+ *
+ * This file may be distributed under the terms of the GNU General
+ * Public License, version 2.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/init.h>
+#include <linux/fs.h>
+#include <linux/pci.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/spinlock.h>
+#include <linux/videodev2.h>
+#include <media/v4l2-common.h>
+#include <linux/device.h>
+#include <linux/wait.h>
+#include <linux/list.h>
+#include <linux/dma-mapping.h>
+#include <linux/delay.h>
+#include <linux/debugfs.h>
+#include <linux/jiffies.h>
+#include <linux/vmalloc.h>
+
+#include <asm/uaccess.h>
+#include <asm/io.h>
+
+#include "cafe_ccic-regs.h"
+
+#define CAFE_VERSION 0x000001
+
+
+/*
+ * Parameters.
+ */
+MODULE_AUTHOR("Jonathan Corbet <corbet@lwn.net>");
+MODULE_DESCRIPTION("Marvell 88ALP01 CMOS Camera Controller driver");
+MODULE_LICENSE("GPL");
+MODULE_SUPPORTED_DEVICE("Video");
+
+/*
+ * Internal DMA buffer management. Since the controller cannot do S/G I/O,
+ * we must have physically contiguous buffers to bring frames into.
+ * These parameters control how many buffers we use, whether we
+ * allocate them at load time (better chance of success, but nails down
+ * memory) or when somebody tries to use the camera (riskier), and,
+ * for load-time allocation, how big they should be.
+ *
+ * The controller can cycle through three buffers. We could use
+ * more by flipping pointers around, but it probably makes little
+ * sense.
+ */
+
+#define MAX_DMA_BUFS 3
+static int alloc_bufs_at_load = 0;
+module_param(alloc_bufs_at_load, bool, 0444);
+MODULE_PARM_DESC(alloc_bufs_at_load,
+ "Non-zero value causes DMA buffers to be allocated at module "
+ "load time. This increases the chances of successfully getting "
+ "those buffers, but at the cost of nailing down the memory from "
+ "the outset.");
+
+static int n_dma_bufs = 3;
+module_param(n_dma_bufs, uint, 0644);
+MODULE_PARM_DESC(n_dma_bufs,
+ "The number of DMA buffers to allocate. Can be either two "
+ "(saves memory, makes timing tighter) or three.");
+
+static int dma_buf_size = VGA_WIDTH * VGA_HEIGHT * 2; /* Worst case */
+module_param(dma_buf_size, uint, 0444);
+MODULE_PARM_DESC(dma_buf_size,
+ "The size of the allocated DMA buffers. If actual operating "
+ "parameters require larger buffers, an attempt to reallocate "
+ "will be made.");
+
+static int min_buffers = 1;
+module_param(min_buffers, uint, 0644);
+MODULE_PARM_DESC(min_buffers,
+ "The minimum number of streaming I/O buffers we are willing "
+ "to work with.");
+
+static int max_buffers = 10;
+module_param(max_buffers, uint, 0644);
+MODULE_PARM_DESC(max_buffers,
+ "The maximum number of streaming I/O buffers an application "
+ "will be allowed to allocate. These buffers are big and live "
+ "in vmalloc space.");
+
+static int flip = 0;
+module_param(flip, bool, 0444);
+MODULE_PARM_DESC(flip,
+ "If set, the sensor will be instructed to flip the image "
+ "vertically.");
+
+
+enum cafe_state {
+ S_NOTREADY, /* Not yet initialized */
+ S_IDLE, /* Just hanging around */
+ S_FLAKED, /* Some sort of problem */
+ S_SINGLEREAD, /* In read() */
+ S_SPECREAD, /* Speculative read (for future read()) */
+ S_STREAMING /* Streaming data */
+};
+
+/*
+ * Tracking of streaming I/O buffers.
+ */
+struct cafe_sio_buffer {
+ struct list_head list;
+ struct v4l2_buffer v4lbuf;
+ char *buffer; /* Where it lives in kernel space */
+ int mapcount;
+ struct cafe_camera *cam;
+};
+
+/*
+ * A description of one of our devices.
+ * Locking: controlled by s_mutex. Certain fields, however, require
+ * the dev_lock spinlock; they are marked as such by comments.
+ * dev_lock is also required for access to device registers.
+ */
+struct cafe_camera
+{
+ enum cafe_state state;
+ unsigned long flags; /* Buffer status, mainly (dev_lock) */
+ int users; /* How many open FDs */
+ struct file *owner; /* Who has data access (v4l2) */
+
+ /*
+ * Subsystem structures.
+ */
+ struct pci_dev *pdev;
+ struct video_device v4ldev;
+ struct i2c_adapter i2c_adapter;
+ struct i2c_client *sensor;
+
+ unsigned char __iomem *regs;
+ struct list_head dev_list; /* link to other devices */
+
+ /* DMA buffers */
+ unsigned int nbufs; /* How many are alloc'd */
+ int next_buf; /* Next to consume (dev_lock) */
+ unsigned int dma_buf_size; /* allocated size */
+ void *dma_bufs[MAX_DMA_BUFS]; /* Internal buffer addresses */
+ dma_addr_t dma_handles[MAX_DMA_BUFS]; /* Buffer bus addresses */
+ unsigned int specframes; /* Unconsumed spec frames (dev_lock) */
+ unsigned int sequence; /* Frame sequence number */
+ unsigned int buf_seq[MAX_DMA_BUFS]; /* Sequence for individual buffers */
+
+ /* Streaming buffers */
+ unsigned int n_sbufs; /* How many we have */
+ struct cafe_sio_buffer *sb_bufs; /* The array of housekeeping structs */
+ struct list_head sb_avail; /* Available for data (we own) (dev_lock) */
+ struct list_head sb_full; /* With data (user space owns) (dev_lock) */
+ struct tasklet_struct s_tasklet;
+
+ /* Current operating parameters */
+ enum v4l2_chip_ident sensor_type; /* Currently ov7670 only */
+ struct v4l2_pix_format pix_format;
+
+ /* Locks */
+ struct mutex s_mutex; /* Access to this structure */
+ spinlock_t dev_lock; /* Access to device */
+
+ /* Misc */
+ wait_queue_head_t smbus_wait; /* Waiting on i2c events */
+ wait_queue_head_t iowait; /* Waiting on frame data */
+#ifdef CONFIG_VIDEO_ADV_DEBUG
+ struct dentry *dfs_regs;
+ struct dentry *dfs_cam_regs;
+#endif
+};
+
+/*
+ * Status flags. Always manipulated with bit operations.
+ */
+#define CF_BUF0_VALID 0 /* Buffers valid - first three */
+#define CF_BUF1_VALID 1
+#define CF_BUF2_VALID 2
+#define CF_DMA_ACTIVE 3 /* A frame is incoming */
+#define CF_CONFIG_NEEDED 4 /* Must configure hardware */
+
+
+
+/*
+ * Start over with DMA buffers - dev_lock needed.
+ */
+static void cafe_reset_buffers(struct cafe_camera *cam)
+{
+ int i;
+
+ cam->next_buf = -1;
+ for (i = 0; i < cam->nbufs; i++)
+ clear_bit(i, &cam->flags);
+ cam->specframes = 0;
+}
+
+static inline int cafe_needs_config(struct cafe_camera *cam)
+{
+ return test_bit(CF_CONFIG_NEEDED, &cam->flags);
+}
+
+static void cafe_set_config_needed(struct cafe_camera *cam, int needed)
+{
+ if (needed)
+ set_bit(CF_CONFIG_NEEDED, &cam->flags);
+ else
+ clear_bit(CF_CONFIG_NEEDED, &cam->flags);
+}
+
+
+
+
+/*
+ * Debugging and related.
+ */
+#define cam_err(cam, fmt, arg...) \
+ dev_err(&(cam)->pdev->dev, fmt, ##arg);
+#define cam_warn(cam, fmt, arg...) \
+ dev_warn(&(cam)->pdev->dev, fmt, ##arg);
+#define cam_dbg(cam, fmt, arg...) \
+ dev_dbg(&(cam)->pdev->dev, fmt, ##arg);
+
+
+/* ---------------------------------------------------------------------*/
+/*
+ * We keep a simple list of known devices to search at open time.
+ */
+static LIST_HEAD(cafe_dev_list);
+static DEFINE_MUTEX(cafe_dev_list_lock);
+
+static void cafe_add_dev(struct cafe_camera *cam)
+{
+ mutex_lock(&cafe_dev_list_lock);
+ list_add_tail(&cam->dev_list, &cafe_dev_list);
+ mutex_unlock(&cafe_dev_list_lock);
+}
+
+static void cafe_remove_dev(struct cafe_camera *cam)
+{
+ mutex_lock(&cafe_dev_list_lock);
+ list_del(&cam->dev_list);
+ mutex_unlock(&cafe_dev_list_lock);
+}
+
+static struct cafe_camera *cafe_find_dev(int minor)
+{
+ struct cafe_camera *cam;
+
+ mutex_lock(&cafe_dev_list_lock);
+ list_for_each_entry(cam, &cafe_dev_list, dev_list) {
+ if (cam->v4ldev.minor == minor)
+ goto done;
+ }
+ cam = NULL;
+ done:
+ mutex_unlock(&cafe_dev_list_lock);
+ return cam;
+}
+
+
+static struct cafe_camera *cafe_find_by_pdev(struct pci_dev *pdev)
+{
+ struct cafe_camera *cam;
+
+ mutex_lock(&cafe_dev_list_lock);
+ list_for_each_entry(cam, &cafe_dev_list, dev_list) {
+ if (cam->pdev == pdev)
+ goto done;
+ }
+ cam = NULL;
+ done:
+ mutex_unlock(&cafe_dev_list_lock);
+ return cam;
+}
+
+
+/* ------------------------------------------------------------------------ */
+/*
+ * Device register I/O
+ */
+static inline void cafe_reg_write(struct cafe_camera *cam, unsigned int reg,
+ unsigned int val)
+{
+ iowrite32(val, cam->regs + reg);
+}
+
+static inline unsigned int cafe_reg_read(struct cafe_camera *cam,
+ unsigned int reg)
+{
+ return ioread32(cam->regs + reg);
+}
+
+
+static inline void cafe_reg_write_mask(struct cafe_camera *cam, unsigned int reg,
+ unsigned int val, unsigned int mask)
+{
+ unsigned int v = cafe_reg_read(cam, reg);
+
+ v = (v & ~mask) | (val & mask);
+ cafe_reg_write(cam, reg, v);
+}
+
+static inline void cafe_reg_clear_bit(struct cafe_camera *cam,
+ unsigned int reg, unsigned int val)
+{
+ cafe_reg_write_mask(cam, reg, 0, val);
+}
+
+static inline void cafe_reg_set_bit(struct cafe_camera *cam,
+ unsigned int reg, unsigned int val)
+{
+ cafe_reg_write_mask(cam, reg, val, val);
+}
+
+
+
+/* -------------------------------------------------------------------- */
+/*
+ * The I2C/SMBUS interface to the camera itself starts here. The
+ * controller handles SMBUS itself, presenting a relatively simple register
+ * interface; all we have to do is to tell it where to route the data.
+ */
+#define CAFE_SMBUS_TIMEOUT (HZ) /* generous */
+
+static int cafe_smbus_write_done(struct cafe_camera *cam)
+{
+ unsigned long flags;
+ int c1;
+
+ /*
+ * We must delay after the interrupt, or the controller gets confused
+ * and never does give us good status. Fortunately, we don't do this
+ * often.
+ */
+ udelay(20);
+ spin_lock_irqsave(&cam->dev_lock, flags);
+ c1 = cafe_reg_read(cam, REG_TWSIC1);
+ spin_unlock_irqrestore(&cam->dev_lock, flags);
+ return (c1 & (TWSIC1_WSTAT|TWSIC1_ERROR)) != TWSIC1_WSTAT;
+}
+
+static int cafe_smbus_write_data(struct cafe_camera *cam,
+ u16 addr, u8 command, u8 value)
+{
+ unsigned int rval;
+ unsigned long flags;
+
+ spin_lock_irqsave(&cam->dev_lock, flags);
+ rval = TWSIC0_EN | ((addr << TWSIC0_SID_SHIFT) & TWSIC0_SID);
+ rval |= TWSIC0_OVMAGIC; /* Make OV sensors work */
+ /*
+ * Marvell sez set clkdiv to all 1's for now.
+ */
+ rval |= TWSIC0_CLKDIV;
+ cafe_reg_write(cam, REG_TWSIC0, rval);
+ (void) cafe_reg_read(cam, REG_TWSIC1); /* force write */
+ rval = value | ((command << TWSIC1_ADDR_SHIFT) & TWSIC1_ADDR);
+ cafe_reg_write(cam, REG_TWSIC1, rval);
+ spin_unlock_irqrestore(&cam->dev_lock, flags);
+ msleep(2); /* Required or things flake */
+
+ wait_event_timeout(cam->smbus_wait, cafe_smbus_write_done(cam),
+ CAFE_SMBUS_TIMEOUT);
+ spin_lock_irqsave(&cam->dev_lock, flags);
+ rval = cafe_reg_read(cam, REG_TWSIC1);
+ spin_unlock_irqrestore(&cam->dev_lock, flags);
+
+ if (rval & TWSIC1_WSTAT) {
+ cam_err(cam, "SMBUS write (%02x/%02x/%02x) timed out\n", addr,
+ command, value);
+ return -EIO;
+ }
+ if (rval & TWSIC1_ERROR) {
+ cam_err(cam, "SMBUS write (%02x/%02x/%02x) error\n", addr,
+ command, value);
+ return -EIO;
+ }
+ return 0;
+}
+
+
+
+static int cafe_smbus_read_done(struct cafe_camera *cam)
+{
+ unsigned long flags;
+ int c1;
+
+ /*
+ * We must delay after the interrupt, or the controller gets confused
+ * and never does give us good status. Fortunately, we don't do this
+ * often.
+ */
+ udelay(20);
+ spin_lock_irqsave(&cam->dev_lock, flags);
+ c1 = cafe_reg_read(cam, REG_TWSIC1);
+ spin_unlock_irqrestore(&cam->dev_lock, flags);
+ return c1 & (TWSIC1_RVALID|TWSIC1_ERROR);
+}
+
+
+
+static int cafe_smbus_read_data(struct cafe_camera *cam,
+ u16 addr, u8 command, u8 *value)
+{
+ unsigned int rval;
+ unsigned long flags;
+
+ spin_lock_irqsave(&cam->dev_lock, flags);
+ rval = TWSIC0_EN | ((addr << TWSIC0_SID_SHIFT) & TWSIC0_SID);
+ rval |= TWSIC0_OVMAGIC; /* Make OV sensors work */
+ /*
+ * Marvel sez set clkdiv to all 1's for now.
+ */
+ rval |= TWSIC0_CLKDIV;
+ cafe_reg_write(cam, REG_TWSIC0, rval);
+ (void) cafe_reg_read(cam, REG_TWSIC1); /* force write */
+ rval = TWSIC1_READ | ((command << TWSIC1_ADDR_SHIFT) & TWSIC1_ADDR);
+ cafe_reg_write(cam, REG_TWSIC1, rval);
+ spin_unlock_irqrestore(&cam->dev_lock, flags);
+
+ wait_event_timeout(cam->smbus_wait,
+ cafe_smbus_read_done(cam), CAFE_SMBUS_TIMEOUT);
+ spin_lock_irqsave(&cam->dev_lock, flags);
+ rval = cafe_reg_read(cam, REG_TWSIC1);
+ spin_unlock_irqrestore(&cam->dev_lock, flags);
+
+ if (rval & TWSIC1_ERROR) {
+ cam_err(cam, "SMBUS read (%02x/%02x) error\n", addr, command);
+ return -EIO;
+ }
+ if (! (rval & TWSIC1_RVALID)) {
+ cam_err(cam, "SMBUS read (%02x/%02x) timed out\n", addr,
+ command);
+ return -EIO;
+ }
+ *value = rval & 0xff;
+ return 0;
+}
+
+/*
+ * Perform a transfer over SMBUS. This thing is called under
+ * the i2c bus lock, so we shouldn't race with ourselves...
+ */
+static int cafe_smbus_xfer(struct i2c_adapter *adapter, u16 addr,
+ unsigned short flags, char rw, u8 command,
+ int size, union i2c_smbus_data *data)
+{
+ struct cafe_camera *cam = i2c_get_adapdata(adapter);
+ int ret = -EINVAL;
+
+ /*
+ * Refuse to talk to anything but OV cam chips. We should
+ * never even see an attempt to do so, but one never knows.
+ */
+ if (cam->sensor && addr != cam->sensor->addr) {
+ cam_err(cam, "funky smbus addr %d\n", addr);
+ return -EINVAL;
+ }
+ /*
+ * This interface would appear to only do byte data ops. OK
+ * it can do word too, but the cam chip has no use for that.
+ */
+ if (size != I2C_SMBUS_BYTE_DATA) {
+ cam_err(cam, "funky xfer size %d\n", size);
+ return -EINVAL;
+ }
+
+ if (rw == I2C_SMBUS_WRITE)
+ ret = cafe_smbus_write_data(cam, addr, command, data->byte);
+ else if (rw == I2C_SMBUS_READ)
+ ret = cafe_smbus_read_data(cam, addr, command, &data->byte);
+ return ret;
+}
+
+
+static void cafe_smbus_enable_irq(struct cafe_camera *cam)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&cam->dev_lock, flags);
+ cafe_reg_set_bit(cam, REG_IRQMASK, TWSIIRQS);
+ spin_unlock_irqrestore(&cam->dev_lock, flags);
+}
+
+static u32 cafe_smbus_func(struct i2c_adapter *adapter)
+{
+ return I2C_FUNC_SMBUS_READ_BYTE_DATA |
+ I2C_FUNC_SMBUS_WRITE_BYTE_DATA;
+}
+
+static struct i2c_algorithm cafe_smbus_algo = {
+ .smbus_xfer = cafe_smbus_xfer,
+ .functionality = cafe_smbus_func
+};
+
+/* Somebody is on the bus */
+static int cafe_cam_init(struct cafe_camera *cam);
+
+static int cafe_smbus_attach(struct i2c_client *client)
+{
+ struct cafe_camera *cam = i2c_get_adapdata(client->adapter);
+
+ /*
+ * Don't talk to chips we don't recognize.
+ */
+ cam_err(cam, "smbus_attach id = %d\n", client->driver->id);
+ if (client->driver->id == I2C_DRIVERID_OV7670) {
+ cam->sensor = client;
+ return cafe_cam_init(cam);
+ }
+ return -EINVAL;
+}
+
+static int cafe_smbus_detach(struct i2c_client *client)
+{
+ struct cafe_camera *cam = i2c_get_adapdata(client->adapter);
+
+ if (cam->sensor == client)
+ cam->sensor = NULL; /* Bummer, no camera */
+ return 0;
+}
+
+static int cafe_smbus_setup(struct cafe_camera *cam)
+{
+ struct i2c_adapter *adap = &cam->i2c_adapter;
+ int ret;
+
+ cafe_smbus_enable_irq(cam);
+ adap->id = I2C_HW_SMBUS_CAFE;
+ adap->class = I2C_CLASS_CAM_DIGITAL;
+ adap->owner = THIS_MODULE;
+ adap->client_register = cafe_smbus_attach;
+ adap->client_unregister = cafe_smbus_detach;
+ adap->algo = &cafe_smbus_algo;
+ strcpy(adap->name, "cafe_ccic");
+ i2c_set_adapdata(adap, cam);
+ ret = i2c_add_adapter(adap);
+ if (ret)
+ printk(KERN_ERR "Unable to register cafe i2c adapter\n");
+ return ret;
+}
+
+static void cafe_smbus_shutdown(struct cafe_camera *cam)
+{
+ i2c_del_adapter(&cam->i2c_adapter);
+}
+
+
+/* ------------------------------------------------------------------- */
+/*
+ * Deal with the controller.
+ */
+
+/*
+ * Do everything we think we need to have the interface operating
+ * according to the desired format.
+ */
+static void cafe_ctlr_dma(struct cafe_camera *cam)
+{
+ /*
+ * Store the first two Y buffers (we aren't supporting
+ * planar formats for now, so no UV bufs). Then either
+ * set the third if it exists, or tell the controller
+ * to just use two.
+ */
+ cafe_reg_write(cam, REG_Y0BAR, cam->dma_handles[0]);
+ cafe_reg_write(cam, REG_Y1BAR, cam->dma_handles[1]);
+ if (cam->nbufs > 2) {
+ cafe_reg_write(cam, REG_Y2BAR, cam->dma_handles[2]);
+ cafe_reg_clear_bit(cam, REG_CTRL1, C1_TWOBUFS);
+ }
+ else
+ cafe_reg_set_bit(cam, REG_CTRL1, C1_TWOBUFS);
+ cafe_reg_write(cam, REG_UBAR, 0); /* 32 bits only for now */
+}
+
+static void cafe_ctlr_image(struct cafe_camera *cam)
+{
+ int imgsz;
+ struct v4l2_pix_format *fmt = &cam->pix_format;
+
+ imgsz = ((fmt->height << IMGSZ_V_SHIFT) & IMGSZ_V_MASK) |
+ (fmt->bytesperline & IMGSZ_H_MASK);
+ cafe_reg_write(cam, REG_IMGSIZE, imgsz);
+ cafe_reg_write(cam, REG_IMGOFFSET, 0);
+ /* YPITCH just drops the last two bits */
+ cafe_reg_write_mask(cam, REG_IMGPITCH, fmt->bytesperline,
+ IMGP_YP_MASK);
+ /*
+ * Tell the controller about the image format we are using.
+ */
+ switch (cam->pix_format.pixelformat) {
+ case V4L2_PIX_FMT_YUYV:
+ cafe_reg_write_mask(cam, REG_CTRL0,
+ C0_DF_YUV|C0_YUV_PACKED|C0_YUVE_YUYV,
+ C0_DF_MASK);
+ break;
+
+ /*
+ * For "fake rgb32" get the image pitch right.
+ */
+ case V4L2_PIX_FMT_RGB32:
+ cafe_reg_write_mask(cam, REG_IMGPITCH, fmt->bytesperline/2,
+ IMGP_YP_MASK);
+ imgsz = ((fmt->height << IMGSZ_V_SHIFT) & IMGSZ_V_MASK) |
+ ((fmt->bytesperline/2) & IMGSZ_H_MASK);
+ cafe_reg_write(cam, REG_IMGSIZE, imgsz);
+ /* fall into ... */
+ case V4L2_PIX_FMT_RGB444:
+ cafe_reg_write_mask(cam, REG_CTRL0,
+ C0_DF_RGB|C0_RGBF_444|C0_RGB4_XRGB,
+ C0_DF_MASK);
+ /* Alpha value? */
+ break;
+
+ case V4L2_PIX_FMT_RGB565:
+ cafe_reg_write_mask(cam, REG_CTRL0,
+ C0_DF_RGB|C0_RGBF_565|C0_RGB5_BGGR,
+ C0_DF_MASK);
+ break;
+
+ default:
+ cam_err(cam, "Unknown format %x\n", cam->pix_format.pixelformat);
+ break;
+ }
+ /*
+ * Make sure it knows we want to use hsync/vsync.
+ */
+ cafe_reg_write_mask(cam, REG_CTRL0, C0_SIF_HVSYNC,
+ C0_SIFM_MASK);
+}
+
+
+/*
+ * Configure the controller for operation; caller holds the
+ * device mutex.
+ */
+static int cafe_ctlr_configure(struct cafe_camera *cam)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&cam->dev_lock, flags);
+ cafe_ctlr_dma(cam);
+ cafe_ctlr_image(cam);
+ cafe_set_config_needed(cam, 0);
+ spin_unlock_irqrestore(&cam->dev_lock, flags);
+ return 0;
+}
+
+static void cafe_ctlr_irq_enable(struct cafe_camera *cam)
+{
+ /*
+ * Clear any pending interrupts, since we do not
+ * expect to have I/O active prior to enabling.
+ */
+ cafe_reg_write(cam, REG_IRQSTAT, FRAMEIRQS);
+ cafe_reg_set_bit(cam, REG_IRQMASK, FRAMEIRQS);
+}
+
+static void cafe_ctlr_irq_disable(struct cafe_camera *cam)
+{
+ cafe_reg_clear_bit(cam, REG_IRQMASK, FRAMEIRQS);
+}
+
+/*
+ * Make the controller start grabbing images. Everything must
+ * be set up before doing this.
+ */
+static void cafe_ctlr_start(struct cafe_camera *cam)
+{
+ /* set_bit performs a read, so no other barrier should be
+ needed here */
+ cafe_reg_set_bit(cam, REG_CTRL0, C0_ENABLE);
+}
+
+static void cafe_ctlr_stop(struct cafe_camera *cam)
+{
+ cafe_reg_clear_bit(cam, REG_CTRL0, C0_ENABLE);
+}
+
+static void cafe_ctlr_init(struct cafe_camera *cam)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&cam->dev_lock, flags);
+ /*
+ * Added magic to bring up the hardware on the B-Test board
+ */
+ cafe_reg_write(cam, 0x3038, 0x8);
+ cafe_reg_write(cam, 0x315c, 0x80008);
+ /*
+ * Go through the dance needed to wake the device up.
+ * Note that these registers are global and shared
+ * with the NAND and SD devices. Interaction between the
+ * three still needs to be examined.
+ */
+ cafe_reg_write(cam, REG_GL_CSR, GCSR_SRS|GCSR_MRS); /* Needed? */
+ cafe_reg_write(cam, REG_GL_CSR, GCSR_SRC|GCSR_MRC);
+ cafe_reg_write(cam, REG_GL_CSR, GCSR_SRC|GCSR_MRS);
+ mdelay(5); /* FIXME revisit this */
+ cafe_reg_write(cam, REG_GL_CSR, GCSR_CCIC_EN|GCSR_SRC|GCSR_MRC);
+ cafe_reg_set_bit(cam, REG_GL_IMASK, GIMSK_CCIC_EN);
+ /*
+ * Make sure it's not powered down.
+ */
+ cafe_reg_clear_bit(cam, REG_CTRL1, C1_PWRDWN);
+ /*
+ * Turn off the enable bit. It sure should be off anyway,
+ * but it's good to be sure.
+ */
+ cafe_reg_clear_bit(cam, REG_CTRL0, C0_ENABLE);
+ /*
+ * Mask all interrupts.
+ */
+ cafe_reg_write(cam, REG_IRQMASK, 0);
+ /*
+ * Clock the sensor appropriately. Controller clock should
+ * be 48MHz, sensor "typical" value is half that.
+ */
+ cafe_reg_write_mask(cam, REG_CLKCTRL, 2, CLK_DIV_MASK);
+ spin_unlock_irqrestore(&cam->dev_lock, flags);
+}
+
+
+/*
+ * Stop the controller, and don't return until we're really sure that no
+ * further DMA is going on.
+ */
+static void cafe_ctlr_stop_dma(struct cafe_camera *cam)
+{
+ unsigned long flags;
+
+ /*
+ * Theory: stop the camera controller (whether it is operating
+ * or not). Delay briefly just in case we race with the SOF
+ * interrupt, then wait until no DMA is active.
+ */
+ spin_lock_irqsave(&cam->dev_lock, flags);
+ cafe_ctlr_stop(cam);
+ spin_unlock_irqrestore(&cam->dev_lock, flags);
+ mdelay(1);
+ wait_event_timeout(cam->iowait,
+ !test_bit(CF_DMA_ACTIVE, &cam->flags), HZ);
+ if (test_bit(CF_DMA_ACTIVE, &cam->flags))
+ cam_err(cam, "Timeout waiting for DMA to end\n");
+ /* This would be bad news - what now? */
+ spin_lock_irqsave(&cam->dev_lock, flags);
+ cam->state = S_IDLE;
+ cafe_ctlr_irq_disable(cam);
+ spin_unlock_irqrestore(&cam->dev_lock, flags);
+}
+
+/*
+ * Power up and down.
+ */
+static void cafe_ctlr_power_up(struct cafe_camera *cam)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&cam->dev_lock, flags);
+ cafe_reg_clear_bit(cam, REG_CTRL1, C1_PWRDWN);
+ /*
+ * Put the sensor into operational mode (assumes OLPC-style
+ * wiring). Control 0 is reset - set to 1 to operate.
+ * Control 1 is power down, set to 0 to operate.
+ */
+ cafe_reg_write(cam, REG_GPR, GPR_C1EN|GPR_C0EN|GPR_C1);
+ mdelay(1); /* Marvell says 1ms will do it */
+ cafe_reg_write(cam, REG_GPR, GPR_C1EN|GPR_C0EN|GPR_C0);
+ mdelay(1); /* Enough? */
+ spin_unlock_irqrestore(&cam->dev_lock, flags);
+}
+
+static void cafe_ctlr_power_down(struct cafe_camera *cam)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&cam->dev_lock, flags);
+ cafe_reg_write(cam, REG_GPR, GPR_C1EN|GPR_C0EN|GPR_C1);
+ cafe_reg_set_bit(cam, REG_CTRL1, C1_PWRDWN);
+ spin_unlock_irqrestore(&cam->dev_lock, flags);
+}
+
+/* -------------------------------------------------------------------- */
+/*
+ * Communications with the sensor.
+ */
+
+static int __cafe_cam_cmd(struct cafe_camera *cam, int cmd, void *arg)
+{
+ struct i2c_client *sc = cam->sensor;
+ int ret;
+
+ if (sc == NULL || sc->driver == NULL || sc->driver->command == NULL)
+ return -EINVAL;
+ ret = sc->driver->command(sc, cmd, arg);
+ if (ret == -EPERM) /* Unsupported command */
+ return 0;
+ return ret;
+}
+
+static int __cafe_cam_reset(struct cafe_camera *cam)
+{
+ int zero = 0;
+ return __cafe_cam_cmd(cam, VIDIOC_INT_RESET, &zero);
+}
+
+/*
+ * We have found the sensor on the i2c. Let's try to have a
+ * conversation.
+ */
+static int cafe_cam_init(struct cafe_camera *cam)
+{
+ int ret;
+
+ mutex_lock(&cam->s_mutex);
+ if (cam->state != S_NOTREADY)
+ cam_warn(cam, "Cam init with device in funky state %d",
+ cam->state);
+ ret = __cafe_cam_reset(cam);
+ if (ret)
+ goto out;
+ ret = __cafe_cam_cmd(cam, VIDIOC_INT_G_CHIP_IDENT, &cam->sensor_type);
+ if (ret)
+ goto out;
+// if (cam->sensor->addr != OV7xx0_SID) {
+ if (cam->sensor_type != V4L2_IDENT_OV7670) {
+ cam_err(cam, "Unsupported sensor type %d", cam->sensor->addr);
+ ret = -EINVAL;
+ goto out;
+ }
+/* Get/set parameters? */
+ ret = 0;
+ cam->state = S_IDLE;
+ out:
+ mutex_unlock(&cam->s_mutex);
+ return ret;
+}
+
+/*
+ * Configure the sensor to match the parameters we have. Caller should
+ * hold s_mutex
+ */
+static int cafe_cam_set_flip(struct cafe_camera *cam)
+{
+ struct v4l2_control ctrl;
+
+ memset(&ctrl, 0, sizeof(ctrl));
+ ctrl.id = V4L2_CID_VFLIP;
+ ctrl.value = flip;
+ return __cafe_cam_cmd(cam, VIDIOC_S_CTRL, &ctrl);
+}
+
+
+static int cafe_cam_configure(struct cafe_camera *cam)
+{
+ struct v4l2_format fmt;
+ int ret, zero = 0;
+
+ if (cam->state != S_IDLE)
+ return -EINVAL;
+ fmt.fmt.pix = cam->pix_format;
+ ret = __cafe_cam_cmd(cam, VIDIOC_INT_INIT, &zero);
+ if (ret == 0)
+ ret = __cafe_cam_cmd(cam, VIDIOC_S_FMT, &fmt);
+ /*
+ * OV7670 does weird things if flip is set *before* format...
+ */
+ ret += cafe_cam_set_flip(cam);
+ return ret;
+}
+
+/* -------------------------------------------------------------------- */
+/*
+ * DMA buffer management. These functions need s_mutex held.
+ */
+
+/* FIXME: this is inefficient as hell, since dma_alloc_coherent just
+ * does a get_free_pages() call, and we waste a good chunk of an orderN
+ * allocation. Should try to allocate the whole set in one chunk.
+ */
+static int cafe_alloc_dma_bufs(struct cafe_camera *cam, int loadtime)
+{
+ int i;
+
+ cafe_set_config_needed(cam, 1);
+ if (loadtime)
+ cam->dma_buf_size = dma_buf_size;
+ else {
+ cam->dma_buf_size = cam->pix_format.sizeimage;
+ if (cam->pix_format.pixelformat == V4L2_PIX_FMT_RGB32)
+ cam->dma_buf_size /= 2;
+ }
+ if (n_dma_bufs > 3)
+ n_dma_bufs = 3;
+
+ cam->nbufs = 0;
+ for (i = 0; i < n_dma_bufs; i++) {
+ cam->dma_bufs[i] = dma_alloc_coherent(&cam->pdev->dev,
+ cam->dma_buf_size, cam->dma_handles + i,
+ GFP_KERNEL);
+ if (cam->dma_bufs[i] == NULL) {
+ cam_warn(cam, "Failed to allocate DMA buffer\n");
+ break;
+ }
+ /* For debug, remove eventually */
+ memset(cam->dma_bufs[i], 0xcc, cam->dma_buf_size);
+ (cam->nbufs)++;
+ }
+
+ switch (cam->nbufs) {
+ case 1:
+ dma_free_coherent(&cam->pdev->dev, cam->dma_buf_size,
+ cam->dma_bufs[0], cam->dma_handles[0]);
+ cam->nbufs = 0;
+ case 0:
+ cam_err(cam, "Insufficient DMA buffers, cannot operate\n");
+ return -ENOMEM;
+
+ case 2:
+ if (n_dma_bufs > 2)
+ cam_warn(cam, "Will limp along with only 2 buffers\n");
+ break;
+ }
+ return 0;
+}
+
+static void cafe_free_dma_bufs(struct cafe_camera *cam)
+{
+ int i;
+
+ for (i = 0; i < cam->nbufs; i++) {
+ dma_free_coherent(&cam->pdev->dev, cam->dma_buf_size,
+ cam->dma_bufs[i], cam->dma_handles[i]);
+ cam->dma_bufs[i] = NULL;
+ }
+ cam->nbufs = 0;
+}
+
+
+
+
+
+/* ----------------------------------------------------------------------- */
+/*
+ * Here starts the V4L2 interface code.
+ */
+
+/*
+ * Read an image from the device.
+ */
+static ssize_t cafe_deliver_buffer(struct cafe_camera *cam,
+ char __user *buffer, size_t len, loff_t *pos)
+{
+ int bufno;
+ unsigned long flags;
+
+ spin_lock_irqsave(&cam->dev_lock, flags);
+ if (cam->next_buf < 0) {
+ cam_err(cam, "deliver_buffer: No next buffer\n");
+ spin_unlock_irqrestore(&cam->dev_lock, flags);
+ return -EIO;
+ }
+ bufno = cam->next_buf;
+ clear_bit(bufno, &cam->flags);
+ if (++(cam->next_buf) >= cam->nbufs)
+ cam->next_buf = 0;
+ if (! test_bit(cam->next_buf, &cam->flags))
+ cam->next_buf = -1;
+ cam->specframes = 0;
+ spin_unlock_irqrestore(&cam->dev_lock, flags);
+
+ if (len > cam->pix_format.sizeimage)
+ len = cam->pix_format.sizeimage;
+ if (copy_to_user(buffer, cam->dma_bufs[bufno], len))
+ return -EFAULT;
+ (*pos) += len;
+ return len;
+}
+
+/*
+ * Get everything ready, and start grabbing frames.
+ */
+static int cafe_read_setup(struct cafe_camera *cam, enum cafe_state state)
+{
+ int ret;
+ unsigned long flags;
+
+ /*
+ * Configuration. If we still don't have DMA buffers,
+ * make one last, desperate attempt.
+ */
+ if (cam->nbufs == 0)
+ if (cafe_alloc_dma_bufs(cam, 0))
+ return -ENOMEM;
+
+ if (cafe_needs_config(cam)) {
+ cafe_cam_configure(cam);
+ ret = cafe_ctlr_configure(cam);
+ if (ret)
+ return ret;
+ }
+
+ /*
+ * Turn it loose.
+ */
+ spin_lock_irqsave(&cam->dev_lock, flags);
+ cafe_reset_buffers(cam);
+ cafe_ctlr_irq_enable(cam);
+ cam->state = state;
+ cafe_ctlr_start(cam);
+ spin_unlock_irqrestore(&cam->dev_lock, flags);
+ return 0;
+}
+
+
+static ssize_t cafe_v4l_read(struct file *filp,
+ char __user *buffer, size_t len, loff_t *pos)
+{
+ struct cafe_camera *cam = filp->private_data;
+ int ret;
+
+ /*
+ * Perhaps we're in speculative read mode and already
+ * have data?
+ */
+ mutex_lock(&cam->s_mutex);
+ if (cam->state == S_SPECREAD) {
+ if (cam->next_buf >= 0) {
+ ret = cafe_deliver_buffer(cam, buffer, len, pos);
+ if (ret != 0)
+ goto out_unlock;
+ }
+ } else if (cam->state == S_FLAKED || cam->state == S_NOTREADY) {
+ ret = -EIO;
+ goto out_unlock;
+ } else if (cam->state != S_IDLE) {
+ ret = -EBUSY;
+ goto out_unlock;
+ }
+
+ /*
+ * v4l2: multiple processes can open the device, but only
+ * one gets to grab data from it.
+ */
+ if (cam->owner && cam->owner != filp) {
+ ret = -EBUSY;
+ goto out_unlock;
+ }
+ cam->owner = filp;
+
+ /*
+ * Do setup if need be.
+ */
+ if (cam->state != S_SPECREAD) {
+ ret = cafe_read_setup(cam, S_SINGLEREAD);
+ if (ret)
+ goto out_unlock;
+ }
+ /*
+ * Wait for something to happen. This should probably
+ * be interruptible (FIXME).
+ */
+ wait_event_timeout(cam->iowait, cam->next_buf >= 0, HZ);
+ if (cam->next_buf < 0) {
+ cam_err(cam, "read() operation timed out\n");
+ cafe_ctlr_stop_dma(cam);
+ ret = -EIO;
+ goto out_unlock;
+ }
+ /*
+ * Give them their data and we should be done.
+ */
+ ret = cafe_deliver_buffer(cam, buffer, len, pos);
+
+ out_unlock:
+ mutex_unlock(&cam->s_mutex);
+ return ret;
+}
+
+
+
+
+
+
+
+
+/*
+ * Streaming I/O support.
+ */
+
+
+
+static int cafe_vidioc_streamon(struct file *filp, void *priv,
+ enum v4l2_buf_type type)
+{
+ struct cafe_camera *cam = filp->private_data;
+ int ret = -EINVAL;
+
+ if (type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
+ goto out;
+ mutex_lock(&cam->s_mutex);
+ if (cam->state != S_IDLE || cam->n_sbufs == 0)
+ goto out_unlock;
+
+ cam->sequence = 0;
+ ret = cafe_read_setup(cam, S_STREAMING);
+
+ out_unlock:
+ mutex_unlock(&cam->s_mutex);
+ out:
+ return ret;
+}
+
+
+static int cafe_vidioc_streamoff(struct file *filp, void *priv,
+ enum v4l2_buf_type type)
+{
+ struct cafe_camera *cam = filp->private_data;
+ int ret = -EINVAL;
+
+ if (type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
+ goto out;
+ mutex_lock(&cam->s_mutex);
+ if (cam->state != S_STREAMING)
+ goto out_unlock;
+
+ cafe_ctlr_stop_dma(cam);
+ ret = 0;
+
+ out_unlock:
+ mutex_unlock(&cam->s_mutex);
+ out:
+ return ret;
+}
+
+
+
+static int cafe_setup_siobuf(struct cafe_camera *cam, int index)
+{
+ struct cafe_sio_buffer *buf = cam->sb_bufs + index;
+
+ INIT_LIST_HEAD(&buf->list);
+ buf->v4lbuf.length = PAGE_ALIGN(cam->pix_format.sizeimage);
+ buf->buffer = vmalloc_user(buf->v4lbuf.length);
+ if (buf->buffer == NULL)
+ return -ENOMEM;
+ buf->mapcount = 0;
+ buf->cam = cam;
+
+ buf->v4lbuf.index = index;
+ buf->v4lbuf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+ buf->v4lbuf.field = V4L2_FIELD_NONE;
+ buf->v4lbuf.memory = V4L2_MEMORY_MMAP;
+ /*
+ * Offset: must be 32-bit even on a 64-bit system. video-buf
+ * just uses the length times the index, but the spec warns
+ * against doing just that - vma merging problems. So we
+ * leave a gap between each pair of buffers.
+ */
+ buf->v4lbuf.m.offset = 2*index*buf->v4lbuf.length;
+ return 0;
+}
+
+static int cafe_free_sio_buffers(struct cafe_camera *cam)
+{
+ int i;
+
+ /*
+ * If any buffers are mapped, we cannot free them at all.
+ */
+ for (i = 0; i < cam->n_sbufs; i++)
+ if (cam->sb_bufs[i].mapcount > 0)
+ return -EBUSY;
+ /*
+ * OK, let's do it.
+ */
+ for (i = 0; i < cam->n_sbufs; i++)
+ vfree(cam->sb_bufs[i].buffer);
+ cam->n_sbufs = 0;
+ kfree(cam->sb_bufs);
+ cam->sb_bufs = NULL;
+ INIT_LIST_HEAD(&cam->sb_avail);
+ INIT_LIST_HEAD(&cam->sb_full);
+ return 0;
+}
+
+
+
+static int cafe_vidioc_reqbufs(struct file *filp, void *priv,
+ struct v4l2_requestbuffers *req)
+{
+ struct cafe_camera *cam = filp->private_data;
+ int ret;
+
+ /*
+ * Make sure it's something we can do. User pointers could be
+ * implemented without great pain, but that's not been done yet.
+ */
+ if (req->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
+ return -EINVAL;
+ if (req->memory != V4L2_MEMORY_MMAP)
+ return -EINVAL;
+ /*
+ * If they ask for zero buffers, they really want us to stop streaming
+ * (if it's happening) and free everything. Should we check owner?
+ */
+ mutex_lock(&cam->s_mutex);
+ if (req->count == 0) {
+ if (cam->state == S_STREAMING)
+ cafe_ctlr_stop_dma(cam);
+ ret = cafe_free_sio_buffers (cam);
+ goto out;
+ }
+ /*
+ * Device needs to be idle and working. We *could* try to do the
+ * right thing in S_SPECREAD by shutting things down, but it
+ * probably doesn't matter.
+ */
+ if (cam->state != S_IDLE || (cam->owner && cam->owner != filp)) {
+ ret = -EBUSY;
+ goto out;
+ }
+ cam->owner = filp;
+
+ if (req->count < min_buffers)
+ req->count = min_buffers;
+ else if (req->count > max_buffers)
+ req->count = max_buffers;
+ if (cam->n_sbufs > 0) {
+ ret = cafe_free_sio_buffers(cam);
+ if (ret)
+ goto out;
+ }
+
+ cam->sb_bufs = kzalloc(req->count*sizeof(struct cafe_sio_buffer),
+ GFP_KERNEL);
+ if (cam->sb_bufs == NULL) {
+ ret = -ENOMEM;
+ goto out;
+ }
+ for (cam->n_sbufs = 0; cam->n_sbufs < req->count; (cam->n_sbufs++)) {
+ ret = cafe_setup_siobuf(cam, cam->n_sbufs);
+ if (ret)
+ break;
+ }
+
+ if (cam->n_sbufs == 0) /* no luck at all - ret already set */
+ kfree(cam->sb_bufs);
+ else
+ ret = 0;
+ req->count = cam->n_sbufs; /* In case of partial success */
+
+ out:
+ mutex_unlock(&cam->s_mutex);
+ return ret;
+}
+
+
+static int cafe_vidioc_querybuf(struct file *filp, void *priv,
+ struct v4l2_buffer *buf)
+{
+ struct cafe_camera *cam = filp->private_data;
+ int ret = -EINVAL;
+
+ mutex_lock(&cam->s_mutex);
+ if (buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
+ goto out;
+ if (buf->index < 0 || buf->index >= cam->n_sbufs)
+ goto out;
+ *buf = cam->sb_bufs[buf->index].v4lbuf;
+ ret = 0;
+ out:
+ mutex_unlock(&cam->s_mutex);
+ return ret;
+}
+
+static int cafe_vidioc_qbuf(struct file *filp, void *priv,
+ struct v4l2_buffer *buf)
+{
+ struct cafe_camera *cam = filp->private_data;
+ struct cafe_sio_buffer *sbuf;
+ int ret = -EINVAL;
+ unsigned long flags;
+
+ mutex_lock(&cam->s_mutex);
+ if (buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
+ goto out;
+ if (buf->index < 0 || buf->index >= cam->n_sbufs)
+ goto out;
+ sbuf = cam->sb_bufs + buf->index;
+ if (sbuf->v4lbuf.flags & V4L2_BUF_FLAG_QUEUED) {
+ ret = 0; /* Already queued?? */
+ goto out;
+ }
+ if (sbuf->v4lbuf.flags & V4L2_BUF_FLAG_DONE) {
+ /* Spec doesn't say anything, seems appropriate tho */
+ ret = -EBUSY;
+ goto out;
+ }
+ sbuf->v4lbuf.flags |= V4L2_BUF_FLAG_QUEUED;
+ spin_lock_irqsave(&cam->dev_lock, flags);
+ list_add(&sbuf->list, &cam->sb_avail);
+ spin_unlock_irqrestore(&cam->dev_lock, flags);
+ ret = 0;
+ out:
+ mutex_unlock(&cam->s_mutex);
+ return ret;
+}
+
+static int cafe_vidioc_dqbuf(struct file *filp, void *priv,
+ struct v4l2_buffer *buf)
+{
+ struct cafe_camera *cam = filp->private_data;
+ struct cafe_sio_buffer *sbuf;
+ int ret = -EINVAL;
+ unsigned long flags;
+
+ mutex_lock(&cam->s_mutex);
+ if (buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
+ goto out_unlock;
+ if (cam->state != S_STREAMING)
+ goto out_unlock;
+ if (list_empty(&cam->sb_full) && filp->f_flags & O_NONBLOCK) {
+ ret = -EAGAIN;
+ goto out_unlock;
+ }
+
+ while (list_empty(&cam->sb_full) && cam->state == S_STREAMING) {
+ mutex_unlock(&cam->s_mutex);
+ if (wait_event_interruptible(cam->iowait,
+ !list_empty(&cam->sb_full))) {
+ ret = -ERESTARTSYS;
+ goto out;
+ }
+ mutex_lock(&cam->s_mutex);
+ }
+
+ if (cam->state != S_STREAMING)
+ ret = -EINTR;
+ else {
+ spin_lock_irqsave(&cam->dev_lock, flags);
+ /* Should probably recheck !list_empty() here */
+ sbuf = list_entry(cam->sb_full.next,
+ struct cafe_sio_buffer, list);
+ list_del_init(&sbuf->list);
+ spin_unlock_irqrestore(&cam->dev_lock, flags);
+ sbuf->v4lbuf.flags &= ~V4L2_BUF_FLAG_DONE;
+ *buf = sbuf->v4lbuf;
+ ret = 0;
+ }
+
+ out_unlock:
+ mutex_unlock(&cam->s_mutex);
+ out:
+ return ret;
+}
+
+
+
+static void cafe_v4l_vm_open(struct vm_area_struct *vma)
+{
+ struct cafe_sio_buffer *sbuf = vma->vm_private_data;
+ /*
+ * Locking: done under mmap_sem, so we don't need to
+ * go back to the camera lock here.
+ */
+ sbuf->mapcount++;
+}
+
+
+static void cafe_v4l_vm_close(struct vm_area_struct *vma)
+{
+ struct cafe_sio_buffer *sbuf = vma->vm_private_data;
+
+ mutex_lock(&sbuf->cam->s_mutex);
+ sbuf->mapcount--;
+ /* Docs say we should stop I/O too... */
+ if (sbuf->mapcount == 0)
+ sbuf->v4lbuf.flags &= ~V4L2_BUF_FLAG_MAPPED;
+ mutex_unlock(&sbuf->cam->s_mutex);
+}
+
+static struct vm_operations_struct cafe_v4l_vm_ops = {
+ .open = cafe_v4l_vm_open,
+ .close = cafe_v4l_vm_close
+};
+
+
+static int cafe_v4l_mmap(struct file *filp, struct vm_area_struct *vma)
+{
+ struct cafe_camera *cam = filp->private_data;
+ unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
+ int ret = -EINVAL;
+ int i;
+ struct cafe_sio_buffer *sbuf = NULL;
+
+ if (! (vma->vm_flags & VM_WRITE) || ! (vma->vm_flags & VM_SHARED))
+ return -EINVAL;
+ /*
+ * Find the buffer they are looking for.
+ */
+ mutex_lock(&cam->s_mutex);
+ for (i = 0; i < cam->n_sbufs; i++)
+ if (cam->sb_bufs[i].v4lbuf.m.offset == offset) {
+ sbuf = cam->sb_bufs + i;
+ break;
+ }
+ if (sbuf == NULL)
+ goto out;
+
+ ret = remap_vmalloc_range(vma, sbuf->buffer, 0);
+ if (ret)
+ goto out;
+ vma->vm_flags |= VM_DONTEXPAND;
+ vma->vm_private_data = sbuf;
+ vma->vm_ops = &cafe_v4l_vm_ops;
+ sbuf->v4lbuf.flags |= V4L2_BUF_FLAG_MAPPED;
+ cafe_v4l_vm_open(vma);
+ ret = 0;
+ out:
+ mutex_unlock(&cam->s_mutex);
+ return ret;
+}
+
+
+
+static int cafe_v4l_open(struct inode *inode, struct file *filp)
+{
+ struct cafe_camera *cam;
+
+ cam = cafe_find_dev(iminor(inode));
+ if (cam == NULL)
+ return -ENODEV;
+ filp->private_data = cam;
+
+ mutex_lock(&cam->s_mutex);
+ if (cam->users == 0) {
+ cafe_ctlr_power_up(cam);
+ __cafe_cam_reset(cam);
+ cafe_set_config_needed(cam, 1);
+ /* FIXME make sure this is complete */
+ }
+ (cam->users)++;
+ mutex_unlock(&cam->s_mutex);
+ return 0;
+}
+
+
+static int cafe_v4l_release(struct inode *inode, struct file *filp)
+{
+ struct cafe_camera *cam = filp->private_data;
+
+ mutex_lock(&cam->s_mutex);
+ (cam->users)--;
+ if (filp == cam->owner) {
+ cafe_ctlr_stop_dma(cam);
+ cafe_free_sio_buffers(cam);
+ cam->owner = NULL;
+ }
+ if (cam->users == 0)
+ cafe_ctlr_power_down(cam);
+ mutex_unlock(&cam->s_mutex);
+ return 0;
+}
+
+
+
+static unsigned int cafe_v4l_poll(struct file *filp,
+ struct poll_table_struct *pt)
+{
+ struct cafe_camera *cam = filp->private_data;
+
+ poll_wait(filp, &cam->iowait, pt);
+ if (cam->next_buf >= 0)
+ return POLLIN | POLLRDNORM;
+ return 0;
+}
+
+
+
+static int cafe_vidioc_queryctrl(struct file *filp, void *priv,
+ struct v4l2_queryctrl *qc)
+{
+ struct cafe_camera *cam = filp->private_data;
+ int ret;
+
+ mutex_lock(&cam->s_mutex);
+ ret = __cafe_cam_cmd(cam, VIDIOC_QUERYCTRL, qc);
+ mutex_unlock(&cam->s_mutex);
+ return ret;
+}
+
+
+static int cafe_vidioc_g_ctrl(struct file *filp, void *priv,
+ struct v4l2_control *ctrl)
+{
+ struct cafe_camera *cam = filp->private_data;
+ int ret;
+
+ mutex_lock(&cam->s_mutex);
+ ret = __cafe_cam_cmd(cam, VIDIOC_G_CTRL, ctrl);
+ mutex_unlock(&cam->s_mutex);
+ return ret;
+}
+
+
+static int cafe_vidioc_s_ctrl(struct file *filp, void *priv,
+ struct v4l2_control *ctrl)
+{
+ struct cafe_camera *cam = filp->private_data;
+ int ret;
+
+ mutex_lock(&cam->s_mutex);
+ ret = __cafe_cam_cmd(cam, VIDIOC_S_CTRL, ctrl);
+ mutex_unlock(&cam->s_mutex);
+ return ret;
+}
+
+
+
+
+
+static int cafe_vidioc_querycap(struct file *file, void *priv,
+ struct v4l2_capability *cap)
+{
+ strcpy(cap->driver, "cafe_ccic");
+ strcpy(cap->card, "cafe_ccic");
+ cap->version = CAFE_VERSION;
+ cap->capabilities = V4L2_CAP_VIDEO_CAPTURE |
+ V4L2_CAP_READWRITE | V4L2_CAP_STREAMING;
+ return 0;
+}
+
+
+/*
+ * The default format we use until somebody says otherwise.
+ */
+static struct v4l2_pix_format cafe_def_pix_format = {
+ .width = VGA_WIDTH,
+ .height = VGA_HEIGHT,
+ .pixelformat = V4L2_PIX_FMT_YUYV,
+ .field = V4L2_FIELD_NONE,
+ .bytesperline = VGA_WIDTH*2,
+ .sizeimage = VGA_WIDTH*VGA_HEIGHT*2,
+};
+
+static int cafe_vidioc_enum_fmt_cap(struct file *filp,
+ void *priv, struct v4l2_fmtdesc *fmt)
+{
+ struct cafe_camera *cam = priv;
+ int ret;
+
+ if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
+ return -EINVAL;
+ mutex_lock(&cam->s_mutex);
+ ret = __cafe_cam_cmd(cam, VIDIOC_ENUM_FMT, fmt);
+ mutex_unlock(&cam->s_mutex);
+ return ret;
+}
+
+
+static int cafe_vidioc_try_fmt_cap (struct file *filp, void *priv,
+ struct v4l2_format *fmt)
+{
+ struct cafe_camera *cam = priv;
+ int ret;
+
+ mutex_lock(&cam->s_mutex);
+ ret = __cafe_cam_cmd(cam, VIDIOC_TRY_FMT, fmt);
+ mutex_unlock(&cam->s_mutex);
+ return ret;
+}
+
+static int cafe_vidioc_s_fmt_cap(struct file *filp, void *priv,
+ struct v4l2_format *fmt)
+{
+ struct cafe_camera *cam = priv;
+ int ret;
+
+ /*
+ * Can't do anything if the device is not idle
+ * Also can't if there are streaming buffers in place.
+ */
+ if (cam->state != S_IDLE || cam->n_sbufs > 0)
+ return -EBUSY;
+ /*
+ * See if the formatting works in principle.
+ */
+ ret = cafe_vidioc_try_fmt_cap(filp, priv, fmt);
+ if (ret)
+ return ret;
+ /*
+ * Now we start to change things for real, so let's do it
+ * under lock.
+ */
+ mutex_lock(&cam->s_mutex);
+ cam->pix_format = fmt->fmt.pix;
+ /*
+ * Make sure we have appropriate DMA buffers.
+ */
+ ret = -ENOMEM;
+ if (cam->nbufs > 0 && cam->dma_buf_size < cam->pix_format.sizeimage)
+ cafe_free_dma_bufs(cam);
+ if (cam->nbufs == 0) {
+ if (cafe_alloc_dma_bufs(cam, 0))
+ goto out;
+ }
+ /*
+ * It looks like this might work, so let's program the sensor.
+ */
+ ret = cafe_cam_configure(cam);
+ if (! ret)
+ ret = cafe_ctlr_configure(cam);
+ out:
+ mutex_unlock(&cam->s_mutex);
+ return ret;
+}
+
+/*
+ * Return our stored notion of how the camera is/should be configured.
+ * The V4l2 spec wants us to be smarter, and actually get this from
+ * the camera (and not mess with it at open time). Someday.
+ */
+static int cafe_vidioc_g_fmt_cap(struct file *filp, void *priv,
+ struct v4l2_format *f)
+{
+ struct cafe_camera *cam = priv;
+
+ f->fmt.pix = cam->pix_format;
+ return 0;
+}
+
+/*
+ * We only have one input - the sensor - so minimize the nonsense here.
+ */
+static int cafe_vidioc_enum_input(struct file *filp, void *priv,
+ struct v4l2_input *input)
+{
+ if (input->index != 0)
+ return -EINVAL;
+
+ input->type = V4L2_INPUT_TYPE_CAMERA;
+ input->std = V4L2_STD_ALL; /* Not sure what should go here */
+ strcpy(input->name, "Camera");
+ return 0;
+}
+
+static int cafe_vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
+{
+ *i = 0;
+ return 0;
+}
+
+static int cafe_vidioc_s_input(struct file *filp, void *priv, unsigned int i)
+{
+ if (i != 0)
+ return -EINVAL;
+ return 0;
+}
+
+/* from vivi.c */
+static int cafe_vidioc_s_std(struct file *filp, void *priv, v4l2_std_id a)
+{
+ return 0;
+}
+
+
+/*
+ * The TV Norm stuff is weird - we're a camera with little to do with TV,
+ * really. The following is what vivi does.
+ */
+static struct v4l2_tvnorm cafe_tvnorm[] = {
+ {
+ .name = "NTSC-M",
+ .id = V4L2_STD_NTSC_M,
+ }
+};
+
+
+void cafe_v4l_dev_release(struct video_device *vd)
+{
+ struct cafe_camera *cam = container_of(vd, struct cafe_camera, v4ldev);
+
+ kfree(cam);
+}
+
+
+/*
+ * This template device holds all of those v4l2 methods; we
+ * clone it for specific real devices.
+ */
+
+static struct file_operations cafe_v4l_fops = {
+ .owner = THIS_MODULE,
+ .open = cafe_v4l_open,
+ .release = cafe_v4l_release,
+ .read = cafe_v4l_read,
+ .poll = cafe_v4l_poll,
+ .mmap = cafe_v4l_mmap,
+ .ioctl = video_ioctl2,
+ .llseek = no_llseek,
+};
+
+static struct video_device cafe_v4l_template = {
+ .name = "cafe",
+ .type = VFL_TYPE_GRABBER,
+ .type2 = VID_TYPE_CAPTURE,
+ .minor = -1, /* Get one dynamically */
+ .tvnorms = cafe_tvnorm,
+ .tvnormsize = 1,
+ .current_norm = V4L2_STD_NTSC_M, /* make mplayer happy */
+
+ .fops = &cafe_v4l_fops,
+ .release = cafe_v4l_dev_release,
+
+ .vidioc_querycap = cafe_vidioc_querycap,
+ .vidioc_enum_fmt_cap = cafe_vidioc_enum_fmt_cap,
+ .vidioc_try_fmt_cap = cafe_vidioc_try_fmt_cap,
+ .vidioc_s_fmt_cap = cafe_vidioc_s_fmt_cap,
+ .vidioc_g_fmt_cap = cafe_vidioc_g_fmt_cap,
+ .vidioc_enum_input = cafe_vidioc_enum_input,
+ .vidioc_g_input = cafe_vidioc_g_input,
+ .vidioc_s_input = cafe_vidioc_s_input,
+ .vidioc_s_std = cafe_vidioc_s_std,
+ .vidioc_reqbufs = cafe_vidioc_reqbufs,
+ .vidioc_querybuf = cafe_vidioc_querybuf,
+ .vidioc_qbuf = cafe_vidioc_qbuf,
+ .vidioc_dqbuf = cafe_vidioc_dqbuf,
+ .vidioc_streamon = cafe_vidioc_streamon,
+ .vidioc_streamoff = cafe_vidioc_streamoff,
+ .vidioc_queryctrl = cafe_vidioc_queryctrl,
+ .vidioc_g_ctrl = cafe_vidioc_g_ctrl,
+ .vidioc_s_ctrl = cafe_vidioc_s_ctrl,
+ /* Do cropping someday */
+};
+
+
+
+
+
+
+
+/* ---------------------------------------------------------------------- */
+/*
+ * Interrupt handler stuff
+ */
+
+/*
+ * Create RGB32 from RGB444 so it can be displayed before the applications
+ * know about the latter format.
+ */
+static void cafe_fake_rgb32(struct cafe_camera *cam, char *dest, char *src)
+{
+ int i;
+ u16 *ssrc = (u16 *) src;
+
+ /* RGB444 version */
+ for (i = 0; i < cam->pix_format.sizeimage; i += 4) {
+ // dest[0] = (*ssrc & 0xf000) >> 8;
+ dest[0] = (*ssrc & 0x000f) << 4;
+ dest[1] = (*ssrc & 0x00f0);
+ dest[2] = (*ssrc & 0x0f00) >> 4;
+ dest[3] = (*ssrc & 0xf000); /* Alpha */
+ dest += 4;
+ ssrc++;
+ }
+}
+
+
+static void cafe_frame_tasklet(unsigned long data)
+{
+ struct cafe_camera *cam = (struct cafe_camera *) data;
+ int i;
+ unsigned long flags;
+ struct cafe_sio_buffer *sbuf;
+
+ spin_lock_irqsave(&cam->dev_lock, flags);
+ for (i = 0; i < cam->nbufs; i++) {
+ int bufno = cam->next_buf;
+ if (bufno < 0) { /* "will never happen" */
+ cam_err(cam, "No valid bufs in tasklet!\n");
+ break;
+ }
+ if (++(cam->next_buf) >= cam->nbufs)
+ cam->next_buf = 0;
+ if (! test_bit(bufno, &cam->flags))
+ continue;
+ if (list_empty(&cam->sb_avail))
+ break; /* Leave it valid, hope for better later */
+ clear_bit(bufno, &cam->flags);
+ /*
+ * We could perhaps drop the spinlock during this
+ * big copy. Something to consider.
+ */
+ sbuf = list_entry(cam->sb_avail.next,
+ struct cafe_sio_buffer, list);
+ if (cam->pix_format.pixelformat == V4L2_PIX_FMT_RGB32)
+ cafe_fake_rgb32(cam, sbuf->buffer, cam->dma_bufs[bufno]);
+ else
+ memcpy(sbuf->buffer, cam->dma_bufs[bufno],
+ cam->pix_format.sizeimage);
+ sbuf->v4lbuf.bytesused = cam->pix_format.sizeimage;
+ sbuf->v4lbuf.sequence = cam->buf_seq[bufno];
+ sbuf->v4lbuf.flags &= ~V4L2_BUF_FLAG_QUEUED;
+ sbuf->v4lbuf.flags |= V4L2_BUF_FLAG_DONE;
+ list_move_tail(&sbuf->list, &cam->sb_full);
+ }
+ if (! list_empty(&cam->sb_full))
+ wake_up(&cam->iowait);
+ spin_unlock_irqrestore(&cam->dev_lock, flags);
+}
+
+
+
+static void cafe_frame_complete(struct cafe_camera *cam, int frame)
+{
+ /*
+ * Basic frame housekeeping.
+ */
+ if (test_bit(frame, &cam->flags) && printk_ratelimit())
+ cam_err(cam, "Frame overrun on %d, frames lost\n", frame);
+ set_bit(frame, &cam->flags);
+ clear_bit(CF_DMA_ACTIVE, &cam->flags);
+ if (cam->next_buf < 0)
+ cam->next_buf = frame;
+ cam->buf_seq[frame] = ++(cam->sequence);
+
+ switch (cam->state) {
+ /*
+ * If in single read mode, try going speculative.
+ */
+ case S_SINGLEREAD:
+ cam->state = S_SPECREAD;
+ cam->specframes = 0;
+ wake_up(&cam->iowait);
+ break;
+
+ /*
+ * If we are already doing speculative reads, and nobody is
+ * reading them, just stop.
+ */
+ case S_SPECREAD:
+ if (++(cam->specframes) >= cam->nbufs) {
+ cafe_ctlr_stop(cam);
+ cafe_ctlr_irq_disable(cam);
+ cam->state = S_IDLE;
+ }
+ wake_up(&cam->iowait);
+ break;
+ /*
+ * For the streaming case, we defer the real work to the
+ * camera tasklet.
+ *
+ * FIXME: if the application is not consuming the buffers,
+ * we should eventually put things on hold and restart in
+ * vidioc_dqbuf().
+ */
+ case S_STREAMING:
+ tasklet_schedule(&cam->s_tasklet);
+ break;
+
+ default:
+ cam_err(cam, "Frame interrupt in non-operational state\n");
+ break;
+ }
+}
+
+
+
+
+static void cafe_frame_irq(struct cafe_camera *cam, unsigned int irqs)
+{
+ unsigned int frame;
+
+ cafe_reg_write(cam, REG_IRQSTAT, FRAMEIRQS); /* Clear'em all */
+ /*
+ * Handle any frame completions. There really should
+ * not be more than one of these, or we have fallen
+ * far behind.
+ */
+ for (frame = 0; frame < cam->nbufs; frame++)
+ if (irqs & (IRQ_EOF0 << frame))
+ cafe_frame_complete(cam, frame);
+ /*
+ * If a frame starts, note that we have DMA active. This
+ * code assumes that we won't get multiple frame interrupts
+ * at once; may want to rethink that.
+ */
+ if (irqs & (IRQ_SOF0 | IRQ_SOF1 | IRQ_SOF2))
+ set_bit(CF_DMA_ACTIVE, &cam->flags);
+}
+
+
+
+static irqreturn_t cafe_irq(int irq, void *data)
+{
+ struct cafe_camera *cam = data;
+ unsigned int irqs;
+
+ spin_lock(&cam->dev_lock);
+ irqs = cafe_reg_read(cam, REG_IRQSTAT);
+ if ((irqs & ALLIRQS) == 0) {
+ spin_unlock(&cam->dev_lock);
+ return IRQ_NONE;
+ }
+ if (irqs & FRAMEIRQS)
+ cafe_frame_irq(cam, irqs);
+ if (irqs & TWSIIRQS) {
+ cafe_reg_write(cam, REG_IRQSTAT, TWSIIRQS);
+ wake_up(&cam->smbus_wait);
+ }
+ spin_unlock(&cam->dev_lock);
+ return IRQ_HANDLED;
+}
+
+
+/* -------------------------------------------------------------------------- */
+#ifdef CONFIG_VIDEO_ADV_DEBUG
+/*
+ * Debugfs stuff.
+ */
+
+static char cafe_debug_buf[1024];
+static struct dentry *cafe_dfs_root;
+
+static void cafe_dfs_setup(void)
+{
+ cafe_dfs_root = debugfs_create_dir("cafe_ccic", NULL);
+ if (IS_ERR(cafe_dfs_root)) {
+ cafe_dfs_root = NULL; /* Never mind */
+ printk(KERN_NOTICE "cafe_ccic unable to set up debugfs\n");
+ }
+}
+
+static void cafe_dfs_shutdown(void)
+{
+ if (cafe_dfs_root)
+ debugfs_remove(cafe_dfs_root);
+}
+
+static int cafe_dfs_open(struct inode *inode, struct file *file)
+{
+ file->private_data = inode->i_private;
+ return 0;
+}
+
+static ssize_t cafe_dfs_read_regs(struct file *file,
+ char __user *buf, size_t count, loff_t *ppos)
+{
+ struct cafe_camera *cam = file->private_data;
+ char *s = cafe_debug_buf;
+ int offset;
+
+ for (offset = 0; offset < 0x44; offset += 4)
+ s += sprintf(s, "%02x: %08x\n", offset,
+ cafe_reg_read(cam, offset));
+ for (offset = 0x88; offset <= 0x90; offset += 4)
+ s += sprintf(s, "%02x: %08x\n", offset,
+ cafe_reg_read(cam, offset));
+ for (offset = 0xb4; offset <= 0xbc; offset += 4)
+ s += sprintf(s, "%02x: %08x\n", offset,
+ cafe_reg_read(cam, offset));
+ for (offset = 0x3000; offset <= 0x300c; offset += 4)
+ s += sprintf(s, "%04x: %08x\n", offset,
+ cafe_reg_read(cam, offset));
+ return simple_read_from_buffer(buf, count, ppos, cafe_debug_buf,
+ s - cafe_debug_buf);
+}
+
+static struct file_operations cafe_dfs_reg_ops = {
+ .owner = THIS_MODULE,
+ .read = cafe_dfs_read_regs,
+ .open = cafe_dfs_open
+};
+
+static ssize_t cafe_dfs_read_cam(struct file *file,
+ char __user *buf, size_t count, loff_t *ppos)
+{
+ struct cafe_camera *cam = file->private_data;
+ char *s = cafe_debug_buf;
+ int offset;
+
+ if (! cam->sensor)
+ return -EINVAL;
+ for (offset = 0x0; offset < 0x8a; offset++)
+ {
+ u8 v;
+
+ cafe_smbus_read_data(cam, cam->sensor->addr, offset, &v);
+ s += sprintf(s, "%02x: %02x\n", offset, v);
+ }
+ return simple_read_from_buffer(buf, count, ppos, cafe_debug_buf,
+ s - cafe_debug_buf);
+}
+
+static struct file_operations cafe_dfs_cam_ops = {
+ .owner = THIS_MODULE,
+ .read = cafe_dfs_read_cam,
+ .open = cafe_dfs_open
+};
+
+
+
+static void cafe_dfs_cam_setup(struct cafe_camera *cam)
+{
+ char fname[40];
+
+ if (!cafe_dfs_root)
+ return;
+ sprintf(fname, "regs-%d", cam->v4ldev.minor);
+ cam->dfs_regs = debugfs_create_file(fname, 0444, cafe_dfs_root,
+ cam, &cafe_dfs_reg_ops);
+ sprintf(fname, "cam-%d", cam->v4ldev.minor);
+ cam->dfs_cam_regs = debugfs_create_file(fname, 0444, cafe_dfs_root,
+ cam, &cafe_dfs_cam_ops);
+}
+
+
+static void cafe_dfs_cam_shutdown(struct cafe_camera *cam)
+{
+ if (! IS_ERR(cam->dfs_regs))
+ debugfs_remove(cam->dfs_regs);
+ if (! IS_ERR(cam->dfs_cam_regs))
+ debugfs_remove(cam->dfs_cam_regs);
+}
+
+#else
+
+#define cafe_dfs_setup()
+#define cafe_dfs_shutdown()
+#define cafe_dfs_cam_setup(cam)
+#define cafe_dfs_cam_shutdown(cam)
+#endif /* CONFIG_VIDEO_ADV_DEBUG */
+
+
+
+
+/* ------------------------------------------------------------------------*/
+/*
+ * PCI interface stuff.
+ */
+
+static int cafe_pci_probe(struct pci_dev *pdev,
+ const struct pci_device_id *id)
+{
+ int ret;
+ u16 classword;
+ struct cafe_camera *cam;
+ /*
+ * Make sure we have a camera here - we'll get calls for
+ * the other cafe devices as well.
+ */
+ pci_read_config_word(pdev, PCI_CLASS_DEVICE, &classword);
+ if (classword != PCI_CLASS_MULTIMEDIA_VIDEO)
+ return -ENODEV;
+ /*
+ * Start putting together one of our big camera structures.
+ */
+ ret = -ENOMEM;
+ cam = kzalloc(sizeof(struct cafe_camera), GFP_KERNEL);
+ if (cam == NULL)
+ goto out;
+ mutex_init(&cam->s_mutex);
+ mutex_lock(&cam->s_mutex);
+ spin_lock_init(&cam->dev_lock);
+ cam->state = S_NOTREADY;
+ cafe_set_config_needed(cam, 1);
+ init_waitqueue_head(&cam->smbus_wait);
+ init_waitqueue_head(&cam->iowait);
+ cam->pdev = pdev;
+ cam->pix_format = cafe_def_pix_format;
+ INIT_LIST_HEAD(&cam->dev_list);
+ INIT_LIST_HEAD(&cam->sb_avail);
+ INIT_LIST_HEAD(&cam->sb_full);
+ tasklet_init(&cam->s_tasklet, cafe_frame_tasklet, (unsigned long) cam);
+ /*
+ * Get set up on the PCI bus.
+ */
+ ret = pci_enable_device(pdev);
+ if (ret)
+ goto out_free;
+ pci_set_master(pdev);
+
+ ret = -EIO;
+ cam->regs = pci_iomap(pdev, 0, 0);
+ if (! cam->regs) {
+ printk(KERN_ERR "Unable to ioremap cafe-ccic regs\n");
+ goto out_free;
+ }
+ ret = request_irq(pdev->irq, cafe_irq, IRQF_SHARED, "cafe-ccic", cam);
+ if (ret)
+ goto out_iounmap;
+ cafe_ctlr_init(cam);
+ cafe_ctlr_power_up(cam);
+ /*
+ * Set up I2C/SMBUS communications
+ */
+ mutex_unlock(&cam->s_mutex); /* attach can deadlock */
+ ret = cafe_smbus_setup(cam);
+ if (ret)
+ goto out_freeirq;
+ /*
+ * Get the v4l2 setup done.
+ */
+ mutex_lock(&cam->s_mutex);
+ cam->v4ldev = cafe_v4l_template;
+ cam->v4ldev.debug = 0;
+// cam->v4ldev.debug = V4L2_DEBUG_IOCTL_ARG;
+ ret = video_register_device(&cam->v4ldev, VFL_TYPE_GRABBER, -1);
+ if (ret)
+ goto out_smbus;
+ /*
+ * If so requested, try to get our DMA buffers now.
+ */
+ if (alloc_bufs_at_load) {
+ if (cafe_alloc_dma_bufs(cam, 1))
+ cam_warn(cam, "Unable to alloc DMA buffers at load"
+ " will try again later.");
+ }
+
+ cafe_dfs_cam_setup(cam);
+ mutex_unlock(&cam->s_mutex);
+ cafe_add_dev(cam);
+ return 0;
+
+ out_smbus:
+ cafe_smbus_shutdown(cam);
+ out_freeirq:
+ cafe_ctlr_power_down(cam);
+ free_irq(pdev->irq, cam);
+ out_iounmap:
+ pci_iounmap(pdev, cam->regs);
+ out_free:
+ kfree(cam);
+ out:
+ return ret;
+}
+
+
+/*
+ * Shut down an initialized device
+ */
+static void cafe_shutdown(struct cafe_camera *cam)
+{
+/* FIXME: Make sure we take care of everything here */
+ cafe_dfs_cam_shutdown(cam);
+ if (cam->n_sbufs > 0)
+ /* What if they are still mapped? Shouldn't be, but... */
+ cafe_free_sio_buffers(cam);
+ cafe_remove_dev(cam);
+ cafe_ctlr_stop_dma(cam);
+ cafe_ctlr_power_down(cam);
+ cafe_smbus_shutdown(cam);
+ cafe_free_dma_bufs(cam);
+ free_irq(cam->pdev->irq, cam);
+ pci_iounmap(cam->pdev, cam->regs);
+ video_unregister_device(&cam->v4ldev);
+ /* kfree(cam); done in v4l_release () */
+}
+
+
+static void cafe_pci_remove(struct pci_dev *pdev)
+{
+ struct cafe_camera *cam = cafe_find_by_pdev(pdev);
+
+ if (cam == NULL) {
+ cam_warn(cam, "pci_remove on unknown pdev %p\n", pdev);
+ return;
+ }
+ mutex_lock(&cam->s_mutex);
+ if (cam->users > 0)
+ cam_warn(cam, "Removing a device with users!\n");
+ cafe_shutdown(cam);
+/* No unlock - it no longer exists */
+}
+
+
+
+
+static struct pci_device_id cafe_ids[] = {
+ { PCI_DEVICE(0x1148, 0x4340) }, /* Temporary ID on devel board */
+ { PCI_DEVICE(0x11ab, 0x4100) }, /* Eventual real ID */
+ { PCI_DEVICE(0x11ab, 0x4102) }, /* Really eventual real ID */
+ { 0, }
+};
+
+MODULE_DEVICE_TABLE(pci, cafe_ids);
+
+static struct pci_driver cafe_pci_driver = {
+ .name = "cafe1000-ccic",
+ .id_table = cafe_ids,
+ .probe = cafe_pci_probe,
+ .remove = cafe_pci_remove,
+};
+
+
+
+
+static int __init cafe_init(void)
+{
+ int ret;
+
+ printk(KERN_NOTICE "Marvell M88ALP01 'CAFE' Camera Controller version %d\n",
+ CAFE_VERSION);
+ cafe_dfs_setup();
+ ret = pci_register_driver(&cafe_pci_driver);
+ if (ret) {
+ printk(KERN_ERR "Unable to register cafe_ccic driver\n");
+ goto out;
+ }
+ request_module("ov7670"); /* FIXME want something more general */
+ ret = 0;
+
+ out:
+ return ret;
+}
+
+
+static void __exit cafe_exit(void)
+{
+ pci_unregister_driver(&cafe_pci_driver);
+ cafe_dfs_shutdown();
+}
+
+module_init(cafe_init);
+module_exit(cafe_exit);
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-23 16:38:08 +0000