1 files changed, 301 insertions, 0 deletions

diff --git a/drivers/media/video/davinci/vpss.c b/drivers/media/video/davinci/vpss.c
new file mode 100644
index 000000000000..6d709ca8cfb0
--- /dev/null
+++ b/drivers/media/video/davinci/vpss.c
@@ -0,0 +1,301 @@
+/*
+ * Copyright (C) 2009 Texas Instruments.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ * common vpss driver for all video drivers.
+ */
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/spinlock.h>
+#include <linux/compiler.h>
+#include <linux/io.h>
+#include <mach/hardware.h>
+#include <media/davinci/vpss.h>
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("VPSS Driver");
+MODULE_AUTHOR("Texas Instruments");
+
+/* DM644x defines */
+#define DM644X_SBL_PCR_VPSS             (4)
+
+/* vpss BL register offsets */
+#define DM355_VPSSBL_CCDCMUX            0x1c
+/* vpss CLK register offsets */
+#define DM355_VPSSCLK_CLKCTRL           0x04
+/* masks and shifts */
+#define VPSS_HSSISEL_SHIFT              4
+
+/*
+ * vpss operations. Depends on platform. Not all functions are available
+ * on all platforms. The api, first check if a functio is available before
+ * invoking it. In the probe, the function ptrs are intialized based on
+ * vpss name. vpss name can be "dm355_vpss", "dm644x_vpss" etc.
+ */
+struct vpss_hw_ops {
+        /* enable clock */
+        int (*enable_clock)(enum vpss_clock_sel clock_sel, int en);
+        /* select input to ccdc */
+        void (*select_ccdc_source)(enum vpss_ccdc_source_sel src_sel);
+        /* clear wbl overlflow bit */
+        int (*clear_wbl_overflow)(enum vpss_wbl_sel wbl_sel);
+};
+
+/* vpss configuration */
+struct vpss_oper_config {
+        __iomem void *vpss_bl_regs_base;
+        __iomem void *vpss_regs_base;
+        struct resource         *r1;
+        resource_size_t         len1;
+        struct resource         *r2;
+        resource_size_t         len2;
+        char vpss_name[32];
+        spinlock_t vpss_lock;
+        struct vpss_hw_ops hw_ops;
+};
+
+static struct vpss_oper_config oper_cfg;
+
+/* register access routines */
+static inline u32 bl_regr(u32 offset)
+{
+        return __raw_readl(oper_cfg.vpss_bl_regs_base + offset);
+}
+
+static inline void bl_regw(u32 val, u32 offset)
+{
+        __raw_writel(val, oper_cfg.vpss_bl_regs_base + offset);
+}
+
+static inline u32 vpss_regr(u32 offset)
+{
+        return __raw_readl(oper_cfg.vpss_regs_base + offset);
+}
+
+static inline void vpss_regw(u32 val, u32 offset)
+{
+        __raw_writel(val, oper_cfg.vpss_regs_base + offset);
+}
+
+static void dm355_select_ccdc_source(enum vpss_ccdc_source_sel src_sel)
+{
+        bl_regw(src_sel << VPSS_HSSISEL_SHIFT, DM355_VPSSBL_CCDCMUX);
+}
+
+int vpss_select_ccdc_source(enum vpss_ccdc_source_sel src_sel)
+{
+        if (!oper_cfg.hw_ops.select_ccdc_source)
+                return -1;
+
+        dm355_select_ccdc_source(src_sel);
+        return 0;
+}
+EXPORT_SYMBOL(vpss_select_ccdc_source);
+
+static int dm644x_clear_wbl_overflow(enum vpss_wbl_sel wbl_sel)
+{
+        u32 mask = 1, val;
+
+        if (wbl_sel < VPSS_PCR_AEW_WBL_0 ||
+            wbl_sel > VPSS_PCR_CCDC_WBL_O)
+                return -1;
+
+        /* writing a 0 clear the overflow */
+        mask = ~(mask << wbl_sel);
+        val = bl_regr(DM644X_SBL_PCR_VPSS) & mask;
+        bl_regw(val, DM644X_SBL_PCR_VPSS);
+        return 0;
+}
+
+int vpss_clear_wbl_overflow(enum vpss_wbl_sel wbl_sel)
+{
+        if (!oper_cfg.hw_ops.clear_wbl_overflow)
+                return -1;
+
+        return oper_cfg.hw_ops.clear_wbl_overflow(wbl_sel);
+}
+EXPORT_SYMBOL(vpss_clear_wbl_overflow);
+
+/*
+ *  dm355_enable_clock - Enable VPSS Clock
+ *  @clock_sel: CLock to be enabled/disabled
+ *  @en: enable/disable flag
+ *
+ *  This is called to enable or disable a vpss clock
+ */
+static int dm355_enable_clock(enum vpss_clock_sel clock_sel, int en)
+{
+        unsigned long flags;
+        u32 utemp, mask = 0x1, shift = 0;
+
+        switch (clock_sel) {
+        case VPSS_VPBE_CLOCK:
+                /* nothing since lsb */
+                break;
+        case VPSS_VENC_CLOCK_SEL:
+                shift = 2;
+                break;
+        case VPSS_CFALD_CLOCK:
+                shift = 3;
+                break;
+        case VPSS_H3A_CLOCK:
+                shift = 4;
+                break;
+        case VPSS_IPIPE_CLOCK:
+                shift = 5;
+                break;
+        case VPSS_CCDC_CLOCK:
+                shift = 6;
+                break;
+        default:
+                printk(KERN_ERR "dm355_enable_clock:"
+                                " Invalid selector: %d\n", clock_sel);
+                return -1;
+        }
+
+        spin_lock_irqsave(&oper_cfg.vpss_lock, flags);
+        utemp = vpss_regr(DM355_VPSSCLK_CLKCTRL);
+        if (!en)
+                utemp &= ~(mask << shift);
+        else
+                utemp |= (mask << shift);
+
+        vpss_regw(utemp, DM355_VPSSCLK_CLKCTRL);
+        spin_unlock_irqrestore(&oper_cfg.vpss_lock, flags);
+        return 0;
+}
+
+int vpss_enable_clock(enum vpss_clock_sel clock_sel, int en)
+{
+        if (!oper_cfg.hw_ops.enable_clock)
+                return -1;
+
+        return oper_cfg.hw_ops.enable_clock(clock_sel, en);
+}
+EXPORT_SYMBOL(vpss_enable_clock);
+
+static int __init vpss_probe(struct platform_device *pdev)
+{
+        int status, dm355 = 0;
+
+        if (!pdev->dev.platform_data) {
+                dev_err(&pdev->dev, "no platform data\n");
+                return -ENOENT;
+        }
+        strcpy(oper_cfg.vpss_name, pdev->dev.platform_data);
+
+        if (!strcmp(oper_cfg.vpss_name, "dm355_vpss"))
+                dm355 = 1;
+        else if (strcmp(oper_cfg.vpss_name, "dm644x_vpss")) {
+                dev_err(&pdev->dev, "vpss driver not supported on"
+                        " this platform\n");
+                return -ENODEV;
+        }
+
+        dev_info(&pdev->dev, "%s vpss probed\n", oper_cfg.vpss_name);
+        oper_cfg.r1 = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        if (!oper_cfg.r1)
+                return -ENOENT;
+
+        oper_cfg.len1 = oper_cfg.r1->end - oper_cfg.r1->start + 1;
+
+        oper_cfg.r1 = request_mem_region(oper_cfg.r1->start, oper_cfg.len1,
+                                         oper_cfg.r1->name);
+        if (!oper_cfg.r1)
+                return -EBUSY;
+
+        oper_cfg.vpss_bl_regs_base = ioremap(oper_cfg.r1->start, oper_cfg.len1);
+        if (!oper_cfg.vpss_bl_regs_base) {
+                status = -EBUSY;
+                goto fail1;
+        }
+
+        if (dm355) {
+                oper_cfg.r2 = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+                if (!oper_cfg.r2) {
+                        status = -ENOENT;
+                        goto fail2;
+                }
+                oper_cfg.len2 = oper_cfg.r2->end - oper_cfg.r2->start + 1;
+                oper_cfg.r2 = request_mem_region(oper_cfg.r2->start,
+                                                 oper_cfg.len2,
+                                                 oper_cfg.r2->name);
+                if (!oper_cfg.r2) {
+                        status = -EBUSY;
+                        goto fail2;
+                }
+
+                oper_cfg.vpss_regs_base = ioremap(oper_cfg.r2->start,
+                                                  oper_cfg.len2);
+                if (!oper_cfg.vpss_regs_base) {
+                        status = -EBUSY;
+                        goto fail3;
+                }
+        }
+
+        if (dm355) {
+                oper_cfg.hw_ops.enable_clock = dm355_enable_clock;
+                oper_cfg.hw_ops.select_ccdc_source = dm355_select_ccdc_source;
+        } else
+                oper_cfg.hw_ops.clear_wbl_overflow = dm644x_clear_wbl_overflow;
+
+        spin_lock_init(&oper_cfg.vpss_lock);
+        dev_info(&pdev->dev, "%s vpss probe success\n", oper_cfg.vpss_name);
+        return 0;
+
+fail3:
+        release_mem_region(oper_cfg.r2->start, oper_cfg.len2);
+fail2:
+        iounmap(oper_cfg.vpss_bl_regs_base);
+fail1:
+        release_mem_region(oper_cfg.r1->start, oper_cfg.len1);
+        return status;
+}
+
+static int vpss_remove(struct platform_device *pdev)
+{
+        iounmap(oper_cfg.vpss_bl_regs_base);
+        release_mem_region(oper_cfg.r1->start, oper_cfg.len1);
+        if (!strcmp(oper_cfg.vpss_name, "dm355_vpss")) {
+                iounmap(oper_cfg.vpss_regs_base);
+                release_mem_region(oper_cfg.r2->start, oper_cfg.len2);
+        }
+        return 0;
+}
+
+static struct platform_driver vpss_driver = {
+        .driver = {
+                .name   = "vpss",
+                .owner = THIS_MODULE,
+        },
+        .remove = __devexit_p(vpss_remove),
+        .probe = vpss_probe,
+};
+
+static void vpss_exit(void)
+{
+        platform_driver_unregister(&vpss_driver);
+}
+
+static int __init vpss_init(void)
+{
+        return platform_driver_register(&vpss_driver);
+}
+subsys_initcall(vpss_init);
+module_exit(vpss_exit);