drm/radeon: introduce kernel modesetting for radeon hardware

Add kernel modesetting support to radeon driver, use the ttm memory
manager to manage memory and DRM/GEM to provide userspace API.
In order to avoid backward compatibility issue and to allow clean
design and code the radeon kernel modesetting use different code path
than old radeon/drm driver.

When kernel modesetting is enabled the IOCTL of radeon/drm
driver are considered as invalid and an error message is printed
in the log and they return failure.

KMS enabled userspace will use new API to talk with the radeon/drm
driver. The new API provide functions to create/destroy/share/mmap
buffer object which are then managed by the kernel memory manager
(here TTM). In order to submit command to the GPU the userspace
provide a buffer holding the command stream, along this buffer
userspace have to provide a list of buffer object used by the
command stream. The kernel radeon driver will then place buffer
in GPU accessible memory and will update command stream to reflect
the position of the different buffers.

The kernel will also perform security check on command stream
provided by the user, we want to catch and forbid any illegal use
of the GPU such as DMA into random system memory or into memory
not owned by the process supplying the command stream. This part
of the code is still incomplete and this why we propose that patch
as a staging driver addition, future security might forbid current
experimental userspace to run.

This code support the following hardware : R1XX,R2XX,R3XX,R4XX,R5XX
(radeon up to X1950). Works is underway to provide support for R6XX,
R7XX and newer hardware (radeon from HD2XXX to HD4XXX).

Authors:
    Jerome Glisse <jglisse@redhat.com>
    Dave Airlie <airlied@redhat.com>
    Alex Deucher <alexdeucher@gmail.com>

Signed-off-by: Jerome Glisse <jglisse@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 209 insertions, 0 deletions

diff --git a/drivers/gpu/drm/radeon/radeon_i2c.c b/drivers/gpu/drm/radeon/radeon_i2c.c
new file mode 100644
index 000000000000..71465ed2688a
--- /dev/null
+++ b/drivers/gpu/drm/radeon/radeon_i2c.c
@@ -0,0 +1,209 @@
+/*
+ * Copyright 2007-8 Advanced Micro Devices, Inc.
+ * Copyright 2008 Red Hat Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Authors: Dave Airlie
+ *          Alex Deucher
+ */
+#include "drmP.h"
+#include "radeon_drm.h"
+#include "radeon.h"
+
+/**
+ * radeon_ddc_probe
+ *
+ */
+bool radeon_ddc_probe(struct radeon_connector *radeon_connector)
+{
+        u8 out_buf[] = { 0x0, 0x0};
+        u8 buf[2];
+        int ret;
+        struct i2c_msg msgs[] = {
+                {
+                        .addr = 0x50,
+                        .flags = 0,
+                        .len = 1,
+                        .buf = out_buf,
+                },
+                {
+                        .addr = 0x50,
+                        .flags = I2C_M_RD,
+                        .len = 1,
+                        .buf = buf,
+                }
+        };
+
+        ret = i2c_transfer(&radeon_connector->ddc_bus->adapter, msgs, 2);
+        if (ret == 2)
+                return true;
+
+        return false;
+}
+
+
+void radeon_i2c_do_lock(struct radeon_connector *radeon_connector, int lock_state)
+{
+        struct radeon_device *rdev = radeon_connector->base.dev->dev_private;
+        uint32_t temp;
+        struct radeon_i2c_bus_rec *rec = &radeon_connector->ddc_bus->rec;
+
+        /* RV410 appears to have a bug where the hw i2c in reset
+         * holds the i2c port in a bad state - switch hw i2c away before
+         * doing DDC - do this for all r200s/r300s/r400s for safety sake
+         */
+        if ((rdev->family >= CHIP_R200) && !ASIC_IS_AVIVO(rdev)) {
+                if (rec->a_clk_reg == RADEON_GPIO_MONID) {
+                        WREG32(RADEON_DVI_I2C_CNTL_0, (RADEON_I2C_SOFT_RST |
+                                                R200_DVI_I2C_PIN_SEL(R200_SEL_DDC1)));
+                } else {
+                        WREG32(RADEON_DVI_I2C_CNTL_0, (RADEON_I2C_SOFT_RST |
+                                                R200_DVI_I2C_PIN_SEL(R200_SEL_DDC3)));
+                }
+        }
+        if (lock_state) {
+                temp = RREG32(rec->a_clk_reg);
+                temp &= ~(rec->a_clk_mask);
+                WREG32(rec->a_clk_reg, temp);
+
+                temp = RREG32(rec->a_data_reg);
+                temp &= ~(rec->a_data_mask);
+                WREG32(rec->a_data_reg, temp);
+        }
+
+        temp = RREG32(rec->mask_clk_reg);
+        if (lock_state)
+                temp |= rec->mask_clk_mask;
+        else
+                temp &= ~rec->mask_clk_mask;
+        WREG32(rec->mask_clk_reg, temp);
+        temp = RREG32(rec->mask_clk_reg);
+
+        temp = RREG32(rec->mask_data_reg);
+        if (lock_state)
+                temp |= rec->mask_data_mask;
+        else
+                temp &= ~rec->mask_data_mask;
+        WREG32(rec->mask_data_reg, temp);
+        temp = RREG32(rec->mask_data_reg);
+}
+
+static int get_clock(void *i2c_priv)
+{
+        struct radeon_i2c_chan *i2c = i2c_priv;
+        struct radeon_device *rdev = i2c->dev->dev_private;
+        struct radeon_i2c_bus_rec *rec = &i2c->rec;
+        uint32_t val;
+
+        val = RREG32(rec->get_clk_reg);
+        val &= rec->get_clk_mask;
+
+        return (val != 0);
+}
+
+
+static int get_data(void *i2c_priv)
+{
+        struct radeon_i2c_chan *i2c = i2c_priv;
+        struct radeon_device *rdev = i2c->dev->dev_private;
+        struct radeon_i2c_bus_rec *rec = &i2c->rec;
+        uint32_t val;
+
+        val = RREG32(rec->get_data_reg);
+        val &= rec->get_data_mask;
+        return (val != 0);
+}
+
+static void set_clock(void *i2c_priv, int clock)
+{
+        struct radeon_i2c_chan *i2c = i2c_priv;
+        struct radeon_device *rdev = i2c->dev->dev_private;
+        struct radeon_i2c_bus_rec *rec = &i2c->rec;
+        uint32_t val;
+
+        val = RREG32(rec->put_clk_reg) & (uint32_t)~(rec->put_clk_mask);
+        val |= clock ? 0 : rec->put_clk_mask;
+        WREG32(rec->put_clk_reg, val);
+}
+
+static void set_data(void *i2c_priv, int data)
+{
+        struct radeon_i2c_chan *i2c = i2c_priv;
+        struct radeon_device *rdev = i2c->dev->dev_private;
+        struct radeon_i2c_bus_rec *rec = &i2c->rec;
+        uint32_t val;
+
+        val = RREG32(rec->put_data_reg) & (uint32_t)~(rec->put_data_mask);
+        val |= data ? 0 : rec->put_data_mask;
+        WREG32(rec->put_data_reg, val);
+}
+
+struct radeon_i2c_chan *radeon_i2c_create(struct drm_device *dev,
+                struct radeon_i2c_bus_rec *rec,
+                const char *name)
+{
+        struct radeon_i2c_chan *i2c;
+        int ret;
+
+        i2c = drm_calloc(1, sizeof(struct radeon_i2c_chan), DRM_MEM_DRIVER);
+        if (i2c == NULL)
+                return NULL;
+
+        i2c->adapter.owner = THIS_MODULE;
+        i2c->adapter.algo_data = &i2c->algo;
+        i2c->dev = dev;
+        i2c->algo.setsda = set_data;
+        i2c->algo.setscl = set_clock;
+        i2c->algo.getsda = get_data;
+        i2c->algo.getscl = get_clock;
+        i2c->algo.udelay = 20;
+        /* vesa says 2.2 ms is enough, 1 jiffy doesn't seem to always
+         * make this, 2 jiffies is a lot more reliable */
+        i2c->algo.timeout = 2;
+        i2c->algo.data = i2c;
+        i2c->rec = *rec;
+        i2c_set_adapdata(&i2c->adapter, i2c);
+
+        ret = i2c_bit_add_bus(&i2c->adapter);
+        if (ret) {
+                DRM_INFO("Failed to register i2c %s\n", name);
+                goto out_free;
+        }
+
+        return i2c;
+out_free:
+        drm_free(i2c, sizeof(struct radeon_i2c_chan), DRM_MEM_DRIVER);
+        return NULL;
+
+}
+
+void radeon_i2c_destroy(struct radeon_i2c_chan *i2c)
+{
+        if (!i2c)
+                return;
+
+        i2c_del_adapter(&i2c->adapter);
+        drm_free(i2c, sizeof(struct radeon_i2c_chan), DRM_MEM_DRIVER);
+}
+
+struct drm_encoder *radeon_best_encoder(struct drm_connector *connector)
+{
+        return NULL;
+}