--- /dev/null
+/*
+ * 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 <linux/export.h>
+
+#include <drm/drmP.h>
+#include <drm/drm_edid.h>
+#include <drm/radeon_drm.h>
+#include "radeon.h"
+#include "atom.h"
+
+extern int radeon_atom_hw_i2c_xfer(struct i2c_adapter *i2c_adap,
+ struct i2c_msg *msgs, int num);
+extern u32 radeon_atom_hw_i2c_func(struct i2c_adapter *adap);
+
+/**
+ * radeon_ddc_probe
+ *
+ */
+bool radeon_ddc_probe(struct radeon_connector *radeon_connector, bool use_aux)
+{
+ u8 out = 0x0;
+ u8 buf[8];
+ int ret;
+ struct i2c_msg msgs[] = {
+ {
+ .addr = DDC_ADDR,
+ .flags = 0,
+ .len = 1,
+ .buf = &out,
+ },
+ {
+ .addr = DDC_ADDR,
+ .flags = I2C_M_RD,
+ .len = 8,
+ .buf = buf,
+ }
+ };
+
+ /* on hw with routers, select right port */
+ if (radeon_connector->router.ddc_valid)
+ radeon_router_select_ddc_port(radeon_connector);
+
+ if (use_aux) {
+ ret = i2c_transfer(&radeon_connector->ddc_bus->aux.ddc, msgs, 2);
+ } else {
+ ret = i2c_transfer(&radeon_connector->ddc_bus->adapter, msgs, 2);
+ }
+
+ if (ret != 2)
+ /* Couldn't find an accessible DDC on this connector */
+ return false;
+ /* Probe also for valid EDID header
+ * EDID header starts with:
+ * 0x00,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0x00.
+ * Only the first 6 bytes must be valid as
+ * drm_edid_block_valid() can fix the last 2 bytes */
+ if (drm_edid_header_is_valid(buf) < 6) {
+ /* Couldn't find an accessible EDID on this
+ * connector */
+ return false;
+ }
+ return true;
+}
+
+/* bit banging i2c */
+
+static int pre_xfer(struct i2c_adapter *i2c_adap)
+{
+ struct radeon_i2c_chan *i2c = i2c_get_adapdata(i2c_adap);
+ struct radeon_device *rdev = i2c->dev->dev_private;
+ struct radeon_i2c_bus_rec *rec = &i2c->rec;
+ uint32_t temp;
+
+ mutex_lock(&i2c->mutex);
+
+ /* 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 (rec->hw_capable) {
+ if ((rdev->family >= CHIP_R200) && !ASIC_IS_AVIVO(rdev)) {
+ u32 reg;
+
+ if (rdev->family >= CHIP_RV350)
+ reg = RADEON_GPIO_MONID;
+ else if ((rdev->family == CHIP_R300) ||
+ (rdev->family == CHIP_R350))
+ reg = RADEON_GPIO_DVI_DDC;
+ else
+ reg = RADEON_GPIO_CRT2_DDC;
+
+ mutex_lock(&rdev->dc_hw_i2c_mutex);
+ if (rec->a_clk_reg == reg) {
+ 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)));
+ }
+ mutex_unlock(&rdev->dc_hw_i2c_mutex);
+ }
+ }
+
+ /* switch the pads to ddc mode */
+ if (ASIC_IS_DCE3(rdev) && rec->hw_capable) {
+ temp = RREG32(rec->mask_clk_reg);
+ temp &= ~(1 << 16);
+ WREG32(rec->mask_clk_reg, temp);
+ }
+
+ /* clear the output pin values */
+ temp = RREG32(rec->a_clk_reg) & ~rec->a_clk_mask;
+ WREG32(rec->a_clk_reg, temp);
+
+ temp = RREG32(rec->a_data_reg) & ~rec->a_data_mask;
+ WREG32(rec->a_data_reg, temp);
+
+ /* set the pins to input */
+ temp = RREG32(rec->en_clk_reg) & ~rec->en_clk_mask;
+ WREG32(rec->en_clk_reg, temp);
+
+ temp = RREG32(rec->en_data_reg) & ~rec->en_data_mask;
+ WREG32(rec->en_data_reg, temp);
+
+ /* mask the gpio pins for software use */
+ temp = RREG32(rec->mask_clk_reg) | rec->mask_clk_mask;
+ WREG32(rec->mask_clk_reg, temp);
+ temp = RREG32(rec->mask_clk_reg);
+
+ temp = RREG32(rec->mask_data_reg) | rec->mask_data_mask;
+ WREG32(rec->mask_data_reg, temp);
+ temp = RREG32(rec->mask_data_reg);
+
+ return 0;
+}
+
+static void post_xfer(struct i2c_adapter *i2c_adap)
+{
+ struct radeon_i2c_chan *i2c = i2c_get_adapdata(i2c_adap);
+ struct radeon_device *rdev = i2c->dev->dev_private;
+ struct radeon_i2c_bus_rec *rec = &i2c->rec;
+ uint32_t temp;
+
+ /* unmask the gpio pins for software use */
+ temp = RREG32(rec->mask_clk_reg) & ~rec->mask_clk_mask;
+ WREG32(rec->mask_clk_reg, temp);
+ temp = RREG32(rec->mask_clk_reg);
+
+ temp = RREG32(rec->mask_data_reg) & ~rec->mask_data_mask;
+ WREG32(rec->mask_data_reg, temp);
+ temp = RREG32(rec->mask_data_reg);
+
+ mutex_unlock(&i2c->mutex);
+}
+
+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;
+
+ /* read the value off the pin */
+ val = RREG32(rec->y_clk_reg);
+ val &= rec->y_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;
+
+ /* read the value off the pin */
+ val = RREG32(rec->y_data_reg);
+ val &= rec->y_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;
+
+ /* set pin direction */
+ val = RREG32(rec->en_clk_reg) & ~rec->en_clk_mask;
+ val |= clock ? 0 : rec->en_clk_mask;
+ WREG32(rec->en_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;
+
+ /* set pin direction */
+ val = RREG32(rec->en_data_reg) & ~rec->en_data_mask;
+ val |= data ? 0 : rec->en_data_mask;
+ WREG32(rec->en_data_reg, val);
+}
+
+/* hw i2c */
+
+static u32 radeon_get_i2c_prescale(struct radeon_device *rdev)
+{
+ u32 sclk = rdev->pm.current_sclk;
+ u32 prescale = 0;
+ u32 nm;
+ u8 n, m, loop;
+ int i2c_clock;
+
+ switch (rdev->family) {
+ case CHIP_R100:
+ case CHIP_RV100:
+ case CHIP_RS100:
+ case CHIP_RV200:
+ case CHIP_RS200:
+ case CHIP_R200:
+ case CHIP_RV250:
+ case CHIP_RS300:
+ case CHIP_RV280:
+ case CHIP_R300:
+ case CHIP_R350:
+ case CHIP_RV350:
+ i2c_clock = 60;
+ nm = (sclk * 10) / (i2c_clock * 4);
+ for (loop = 1; loop < 255; loop++) {
+ if ((nm / loop) < loop)
+ break;
+ }
+ n = loop - 1;
+ m = loop - 2;
+ prescale = m | (n << 8);
+ break;
+ case CHIP_RV380:
+ case CHIP_RS400:
+ case CHIP_RS480:
+ case CHIP_R420:
+ case CHIP_R423:
+ case CHIP_RV410:
+ prescale = (((sclk * 10)/(4 * 128 * 100) + 1) << 8) + 128;
+ break;
+ case CHIP_RS600:
+ case CHIP_RS690:
+ case CHIP_RS740:
+ /* todo */
+ break;
+ case CHIP_RV515:
+ case CHIP_R520:
+ case CHIP_RV530:
+ case CHIP_RV560:
+ case CHIP_RV570:
+ case CHIP_R580:
+ i2c_clock = 50;
+ if (rdev->family == CHIP_R520)
+ prescale = (127 << 8) + ((sclk * 10) / (4 * 127 * i2c_clock));
+ else
+ prescale = (((sclk * 10)/(4 * 128 * 100) + 1) << 8) + 128;
+ break;
+ case CHIP_R600:
+ case CHIP_RV610:
+ case CHIP_RV630:
+ case CHIP_RV670:
+ /* todo */
+ break;
+ case CHIP_RV620:
+ case CHIP_RV635:
+ case CHIP_RS780:
+ case CHIP_RS880:
+ case CHIP_RV770:
+ case CHIP_RV730:
+ case CHIP_RV710:
+ case CHIP_RV740:
+ /* todo */
+ break;
+ case CHIP_CEDAR:
+ case CHIP_REDWOOD:
+ case CHIP_JUNIPER:
+ case CHIP_CYPRESS:
+ case CHIP_HEMLOCK:
+ /* todo */
+ break;
+ default:
+ DRM_ERROR("i2c: unhandled radeon chip\n");
+ break;
+ }
+ return prescale;
+}
+
+
+/* hw i2c engine for r1xx-4xx hardware
+ * hw can buffer up to 15 bytes
+ */
+static int r100_hw_i2c_xfer(struct i2c_adapter *i2c_adap,
+ struct i2c_msg *msgs, int num)
+{
+ struct radeon_i2c_chan *i2c = i2c_get_adapdata(i2c_adap);
+ struct radeon_device *rdev = i2c->dev->dev_private;
+ struct radeon_i2c_bus_rec *rec = &i2c->rec;
+ struct i2c_msg *p;
+ int i, j, k, ret = num;
+ u32 prescale;
+ u32 i2c_cntl_0, i2c_cntl_1, i2c_data;
+ u32 tmp, reg;
+
+ mutex_lock(&rdev->dc_hw_i2c_mutex);
+ /* take the pm lock since we need a constant sclk */
+ mutex_lock(&rdev->pm.mutex);
+
+ prescale = radeon_get_i2c_prescale(rdev);
+
+ reg = ((prescale << RADEON_I2C_PRESCALE_SHIFT) |
+ RADEON_I2C_DRIVE_EN |
+ RADEON_I2C_START |
+ RADEON_I2C_STOP |
+ RADEON_I2C_GO);
+
+ if (rdev->is_atom_bios) {
+ tmp = RREG32(RADEON_BIOS_6_SCRATCH);
+ WREG32(RADEON_BIOS_6_SCRATCH, tmp | ATOM_S6_HW_I2C_BUSY_STATE);
+ }
+
+ if (rec->mm_i2c) {
+ i2c_cntl_0 = RADEON_I2C_CNTL_0;
+ i2c_cntl_1 = RADEON_I2C_CNTL_1;
+ i2c_data = RADEON_I2C_DATA;
+ } else {
+ i2c_cntl_0 = RADEON_DVI_I2C_CNTL_0;
+ i2c_cntl_1 = RADEON_DVI_I2C_CNTL_1;
+ i2c_data = RADEON_DVI_I2C_DATA;
+
+ switch (rdev->family) {
+ case CHIP_R100:
+ case CHIP_RV100:
+ case CHIP_RS100:
+ case CHIP_RV200:
+ case CHIP_RS200:
+ case CHIP_RS300:
+ switch (rec->mask_clk_reg) {
+ case RADEON_GPIO_DVI_DDC:
+ /* no gpio select bit */
+ break;
+ default:
+ DRM_ERROR("gpio not supported with hw i2c\n");
+ ret = -EINVAL;
+ goto done;
+ }
+ break;
+ case CHIP_R200:
+ /* only bit 4 on r200 */
+ switch (rec->mask_clk_reg) {
+ case RADEON_GPIO_DVI_DDC:
+ reg |= R200_DVI_I2C_PIN_SEL(R200_SEL_DDC1);
+ break;
+ case RADEON_GPIO_MONID:
+ reg |= R200_DVI_I2C_PIN_SEL(R200_SEL_DDC3);
+ break;
+ default:
+ DRM_ERROR("gpio not supported with hw i2c\n");
+ ret = -EINVAL;
+ goto done;
+ }
+ break;
+ case CHIP_RV250:
+ case CHIP_RV280:
+ /* bits 3 and 4 */
+ switch (rec->mask_clk_reg) {
+ case RADEON_GPIO_DVI_DDC:
+ reg |= R200_DVI_I2C_PIN_SEL(R200_SEL_DDC1);
+ break;
+ case RADEON_GPIO_VGA_DDC:
+ reg |= R200_DVI_I2C_PIN_SEL(R200_SEL_DDC2);
+ break;
+ case RADEON_GPIO_CRT2_DDC:
+ reg |= R200_DVI_I2C_PIN_SEL(R200_SEL_DDC3);
+ break;
+ default:
+ DRM_ERROR("gpio not supported with hw i2c\n");
+ ret = -EINVAL;
+ goto done;
+ }
+ break;
+ case CHIP_R300:
+ case CHIP_R350:
+ /* only bit 4 on r300/r350 */
+ switch (rec->mask_clk_reg) {
+ case RADEON_GPIO_VGA_DDC:
+ reg |= R200_DVI_I2C_PIN_SEL(R200_SEL_DDC1);
+ break;
+ case RADEON_GPIO_DVI_DDC:
+ reg |= R200_DVI_I2C_PIN_SEL(R200_SEL_DDC3);
+ break;
+ default:
+ DRM_ERROR("gpio not supported with hw i2c\n");
+ ret = -EINVAL;
+ goto done;
+ }
+ break;
+ case CHIP_RV350:
+ case CHIP_RV380:
+ case CHIP_R420:
+ case CHIP_R423:
+ case CHIP_RV410:
+ case CHIP_RS400:
+ case CHIP_RS480:
+ /* bits 3 and 4 */
+ switch (rec->mask_clk_reg) {
+ case RADEON_GPIO_VGA_DDC:
+ reg |= R200_DVI_I2C_PIN_SEL(R200_SEL_DDC1);
+ break;
+ case RADEON_GPIO_DVI_DDC:
+ reg |= R200_DVI_I2C_PIN_SEL(R200_SEL_DDC2);
+ break;
+ case RADEON_GPIO_MONID:
+ reg |= R200_DVI_I2C_PIN_SEL(R200_SEL_DDC3);
+ break;
+ default:
+ DRM_ERROR("gpio not supported with hw i2c\n");
+ ret = -EINVAL;
+ goto done;
+ }
+ break;
+ default:
+ DRM_ERROR("unsupported asic\n");
+ ret = -EINVAL;
+ goto done;
+ break;
+ }
+ }
+
+ /* check for bus probe */
+ p = &msgs[0];
+ if ((num == 1) && (p->len == 0)) {
+ WREG32(i2c_cntl_0, (RADEON_I2C_DONE |
+ RADEON_I2C_NACK |
+ RADEON_I2C_HALT |
+ RADEON_I2C_SOFT_RST));
+ WREG32(i2c_data, (p->addr << 1) & 0xff);
+ WREG32(i2c_data, 0);
+ WREG32(i2c_cntl_1, ((1 << RADEON_I2C_DATA_COUNT_SHIFT) |
+ (1 << RADEON_I2C_ADDR_COUNT_SHIFT) |
+ RADEON_I2C_EN |
+ (48 << RADEON_I2C_TIME_LIMIT_SHIFT)));
+ WREG32(i2c_cntl_0, reg);
+ for (k = 0; k < 32; k++) {
+ udelay(10);
+ tmp = RREG32(i2c_cntl_0);
+ if (tmp & RADEON_I2C_GO)
+ continue;
+ tmp = RREG32(i2c_cntl_0);
+ if (tmp & RADEON_I2C_DONE)
+ break;
+ else {
+ DRM_DEBUG("i2c write error 0x%08x\n", tmp);
+ WREG32(i2c_cntl_0, tmp | RADEON_I2C_ABORT);
+ ret = -EIO;
+ goto done;
+ }
+ }
+ goto done;
+ }
+
+ for (i = 0; i < num; i++) {
+ p = &msgs[i];
+ for (j = 0; j < p->len; j++) {
+ if (p->flags & I2C_M_RD) {
+ WREG32(i2c_cntl_0, (RADEON_I2C_DONE |
+ RADEON_I2C_NACK |
+ RADEON_I2C_HALT |
+ RADEON_I2C_SOFT_RST));
+ WREG32(i2c_data, ((p->addr << 1) & 0xff) | 0x1);
+ WREG32(i2c_cntl_1, ((1 << RADEON_I2C_DATA_COUNT_SHIFT) |
+ (1 << RADEON_I2C_ADDR_COUNT_SHIFT) |
+ RADEON_I2C_EN |
+ (48 << RADEON_I2C_TIME_LIMIT_SHIFT)));
+ WREG32(i2c_cntl_0, reg | RADEON_I2C_RECEIVE);
+ for (k = 0; k < 32; k++) {
+ udelay(10);
+ tmp = RREG32(i2c_cntl_0);
+ if (tmp & RADEON_I2C_GO)
+ continue;
+ tmp = RREG32(i2c_cntl_0);
+ if (tmp & RADEON_I2C_DONE)
+ break;
+ else {
+ DRM_DEBUG("i2c read error 0x%08x\n", tmp);
+ WREG32(i2c_cntl_0, tmp | RADEON_I2C_ABORT);
+ ret = -EIO;
+ goto done;
+ }
+ }
+ p->buf[j] = RREG32(i2c_data) & 0xff;
+ } else {
+ WREG32(i2c_cntl_0, (RADEON_I2C_DONE |
+ RADEON_I2C_NACK |
+ RADEON_I2C_HALT |
+ RADEON_I2C_SOFT_RST));
+ WREG32(i2c_data, (p->addr << 1) & 0xff);
+ WREG32(i2c_data, p->buf[j]);
+ WREG32(i2c_cntl_1, ((1 << RADEON_I2C_DATA_COUNT_SHIFT) |
+ (1 << RADEON_I2C_ADDR_COUNT_SHIFT) |
+ RADEON_I2C_EN |
+ (48 << RADEON_I2C_TIME_LIMIT_SHIFT)));
+ WREG32(i2c_cntl_0, reg);
+ for (k = 0; k < 32; k++) {
+ udelay(10);
+ tmp = RREG32(i2c_cntl_0);
+ if (tmp & RADEON_I2C_GO)
+ continue;
+ tmp = RREG32(i2c_cntl_0);
+ if (tmp & RADEON_I2C_DONE)
+ break;
+ else {
+ DRM_DEBUG("i2c write error 0x%08x\n", tmp);
+ WREG32(i2c_cntl_0, tmp | RADEON_I2C_ABORT);
+ ret = -EIO;
+ goto done;
+ }
+ }
+ }
+ }
+ }
+
+done:
+ WREG32(i2c_cntl_0, 0);
+ WREG32(i2c_cntl_1, 0);
+ WREG32(i2c_cntl_0, (RADEON_I2C_DONE |
+ RADEON_I2C_NACK |
+ RADEON_I2C_HALT |
+ RADEON_I2C_SOFT_RST));
+
+ if (rdev->is_atom_bios) {
+ tmp = RREG32(RADEON_BIOS_6_SCRATCH);
+ tmp &= ~ATOM_S6_HW_I2C_BUSY_STATE;
+ WREG32(RADEON_BIOS_6_SCRATCH, tmp);
+ }
+
+ mutex_unlock(&rdev->pm.mutex);
+ mutex_unlock(&rdev->dc_hw_i2c_mutex);
+
+ return ret;
+}
+
+/* hw i2c engine for r5xx hardware
+ * hw can buffer up to 15 bytes
+ */
+static int r500_hw_i2c_xfer(struct i2c_adapter *i2c_adap,
+ struct i2c_msg *msgs, int num)
+{
+ struct radeon_i2c_chan *i2c = i2c_get_adapdata(i2c_adap);
+ struct radeon_device *rdev = i2c->dev->dev_private;
+ struct radeon_i2c_bus_rec *rec = &i2c->rec;
+ struct i2c_msg *p;
+ int i, j, remaining, current_count, buffer_offset, ret = num;
+ u32 prescale;
+ u32 tmp, reg;
+ u32 saved1, saved2;
+
+ mutex_lock(&rdev->dc_hw_i2c_mutex);
+ /* take the pm lock since we need a constant sclk */
+ mutex_lock(&rdev->pm.mutex);
+
+ prescale = radeon_get_i2c_prescale(rdev);
+
+ /* clear gpio mask bits */
+ tmp = RREG32(rec->mask_clk_reg);
+ tmp &= ~rec->mask_clk_mask;
+ WREG32(rec->mask_clk_reg, tmp);
+ tmp = RREG32(rec->mask_clk_reg);
+
+ tmp = RREG32(rec->mask_data_reg);
+ tmp &= ~rec->mask_data_mask;
+ WREG32(rec->mask_data_reg, tmp);
+ tmp = RREG32(rec->mask_data_reg);
+
+ /* clear pin values */
+ tmp = RREG32(rec->a_clk_reg);
+ tmp &= ~rec->a_clk_mask;
+ WREG32(rec->a_clk_reg, tmp);
+ tmp = RREG32(rec->a_clk_reg);
+
+ tmp = RREG32(rec->a_data_reg);
+ tmp &= ~rec->a_data_mask;
+ WREG32(rec->a_data_reg, tmp);
+ tmp = RREG32(rec->a_data_reg);
+
+ /* set the pins to input */
+ tmp = RREG32(rec->en_clk_reg);
+ tmp &= ~rec->en_clk_mask;
+ WREG32(rec->en_clk_reg, tmp);
+ tmp = RREG32(rec->en_clk_reg);
+
+ tmp = RREG32(rec->en_data_reg);
+ tmp &= ~rec->en_data_mask;
+ WREG32(rec->en_data_reg, tmp);
+ tmp = RREG32(rec->en_data_reg);
+
+ /* */
+ tmp = RREG32(RADEON_BIOS_6_SCRATCH);
+ WREG32(RADEON_BIOS_6_SCRATCH, tmp | ATOM_S6_HW_I2C_BUSY_STATE);
+ saved1 = RREG32(AVIVO_DC_I2C_CONTROL1);
+ saved2 = RREG32(0x494);
+ WREG32(0x494, saved2 | 0x1);
+
+ WREG32(AVIVO_DC_I2C_ARBITRATION, AVIVO_DC_I2C_SW_WANTS_TO_USE_I2C);
+ for (i = 0; i < 50; i++) {
+ udelay(1);
+ if (RREG32(AVIVO_DC_I2C_ARBITRATION) & AVIVO_DC_I2C_SW_CAN_USE_I2C)
+ break;
+ }
+ if (i == 50) {
+ DRM_ERROR("failed to get i2c bus\n");
+ ret = -EBUSY;
+ goto done;
+ }
+
+ reg = AVIVO_DC_I2C_START | AVIVO_DC_I2C_STOP | AVIVO_DC_I2C_EN;
+ switch (rec->mask_clk_reg) {
+ case AVIVO_DC_GPIO_DDC1_MASK:
+ reg |= AVIVO_DC_I2C_PIN_SELECT(AVIVO_SEL_DDC1);
+ break;
+ case AVIVO_DC_GPIO_DDC2_MASK:
+ reg |= AVIVO_DC_I2C_PIN_SELECT(AVIVO_SEL_DDC2);
+ break;
+ case AVIVO_DC_GPIO_DDC3_MASK:
+ reg |= AVIVO_DC_I2C_PIN_SELECT(AVIVO_SEL_DDC3);
+ break;
+ default:
+ DRM_ERROR("gpio not supported with hw i2c\n");
+ ret = -EINVAL;
+ goto done;
+ }
+
+ /* check for bus probe */
+ p = &msgs[0];
+ if ((num == 1) && (p->len == 0)) {
+ WREG32(AVIVO_DC_I2C_STATUS1, (AVIVO_DC_I2C_DONE |
+ AVIVO_DC_I2C_NACK |
+ AVIVO_DC_I2C_HALT));
+ WREG32(AVIVO_DC_I2C_RESET, AVIVO_DC_I2C_SOFT_RESET);
+ udelay(1);
+ WREG32(AVIVO_DC_I2C_RESET, 0);
+
+ WREG32(AVIVO_DC_I2C_DATA, (p->addr << 1) & 0xff);
+ WREG32(AVIVO_DC_I2C_DATA, 0);
+
+ WREG32(AVIVO_DC_I2C_CONTROL3, AVIVO_DC_I2C_TIME_LIMIT(48));
+ WREG32(AVIVO_DC_I2C_CONTROL2, (AVIVO_DC_I2C_ADDR_COUNT(1) |
+ AVIVO_DC_I2C_DATA_COUNT(1) |
+ (prescale << 16)));
+ WREG32(AVIVO_DC_I2C_CONTROL1, reg);
+ WREG32(AVIVO_DC_I2C_STATUS1, AVIVO_DC_I2C_GO);
+ for (j = 0; j < 200; j++) {
+ udelay(50);
+ tmp = RREG32(AVIVO_DC_I2C_STATUS1);
+ if (tmp & AVIVO_DC_I2C_GO)
+ continue;
+ tmp = RREG32(AVIVO_DC_I2C_STATUS1);
+ if (tmp & AVIVO_DC_I2C_DONE)
+ break;
+ else {
+ DRM_DEBUG("i2c write error 0x%08x\n", tmp);
+ WREG32(AVIVO_DC_I2C_RESET, AVIVO_DC_I2C_ABORT);
+ ret = -EIO;
+ goto done;
+ }
+ }
+ goto done;
+ }
+
+ for (i = 0; i < num; i++) {
+ p = &msgs[i];
+ remaining = p->len;
+ buffer_offset = 0;
+ if (p->flags & I2C_M_RD) {
+ while (remaining) {
+ if (remaining > 15)
+ current_count = 15;
+ else
+ current_count = remaining;
+ WREG32(AVIVO_DC_I2C_STATUS1, (AVIVO_DC_I2C_DONE |
+ AVIVO_DC_I2C_NACK |
+ AVIVO_DC_I2C_HALT));
+ WREG32(AVIVO_DC_I2C_RESET, AVIVO_DC_I2C_SOFT_RESET);
+ udelay(1);
+ WREG32(AVIVO_DC_I2C_RESET, 0);
+
+ WREG32(AVIVO_DC_I2C_DATA, ((p->addr << 1) & 0xff) | 0x1);
+ WREG32(AVIVO_DC_I2C_CONTROL3, AVIVO_DC_I2C_TIME_LIMIT(48));
+ WREG32(AVIVO_DC_I2C_CONTROL2, (AVIVO_DC_I2C_ADDR_COUNT(1) |
+ AVIVO_DC_I2C_DATA_COUNT(current_count) |
+ (prescale << 16)));
+ WREG32(AVIVO_DC_I2C_CONTROL1, reg | AVIVO_DC_I2C_RECEIVE);
+ WREG32(AVIVO_DC_I2C_STATUS1, AVIVO_DC_I2C_GO);
+ for (j = 0; j < 200; j++) {
+ udelay(50);
+ tmp = RREG32(AVIVO_DC_I2C_STATUS1);
+ if (tmp & AVIVO_DC_I2C_GO)
+ continue;
+ tmp = RREG32(AVIVO_DC_I2C_STATUS1);
+ if (tmp & AVIVO_DC_I2C_DONE)
+ break;
+ else {
+ DRM_DEBUG("i2c read error 0x%08x\n", tmp);
+ WREG32(AVIVO_DC_I2C_RESET, AVIVO_DC_I2C_ABORT);
+ ret = -EIO;
+ goto done;
+ }
+ }
+ for (j = 0; j < current_count; j++)
+ p->buf[buffer_offset + j] = RREG32(AVIVO_DC_I2C_DATA) & 0xff;
+ remaining -= current_count;
+ buffer_offset += current_count;
+ }
+ } else {
+ while (remaining) {
+ if (remaining > 15)
+ current_count = 15;
+ else
+ current_count = remaining;
+ WREG32(AVIVO_DC_I2C_STATUS1, (AVIVO_DC_I2C_DONE |
+ AVIVO_DC_I2C_NACK |
+ AVIVO_DC_I2C_HALT));
+ WREG32(AVIVO_DC_I2C_RESET, AVIVO_DC_I2C_SOFT_RESET);
+ udelay(1);
+ WREG32(AVIVO_DC_I2C_RESET, 0);
+
+ WREG32(AVIVO_DC_I2C_DATA, (p->addr << 1) & 0xff);
+ for (j = 0; j < current_count; j++)
+ WREG32(AVIVO_DC_I2C_DATA, p->buf[buffer_offset + j]);
+
+ WREG32(AVIVO_DC_I2C_CONTROL3, AVIVO_DC_I2C_TIME_LIMIT(48));
+ WREG32(AVIVO_DC_I2C_CONTROL2, (AVIVO_DC_I2C_ADDR_COUNT(1) |
+ AVIVO_DC_I2C_DATA_COUNT(current_count) |
+ (prescale << 16)));
+ WREG32(AVIVO_DC_I2C_CONTROL1, reg);
+ WREG32(AVIVO_DC_I2C_STATUS1, AVIVO_DC_I2C_GO);
+ for (j = 0; j < 200; j++) {
+ udelay(50);
+ tmp = RREG32(AVIVO_DC_I2C_STATUS1);
+ if (tmp & AVIVO_DC_I2C_GO)
+ continue;
+ tmp = RREG32(AVIVO_DC_I2C_STATUS1);
+ if (tmp & AVIVO_DC_I2C_DONE)
+ break;
+ else {
+ DRM_DEBUG("i2c write error 0x%08x\n", tmp);
+ WREG32(AVIVO_DC_I2C_RESET, AVIVO_DC_I2C_ABORT);
+ ret = -EIO;
+ goto done;
+ }
+ }
+ remaining -= current_count;
+ buffer_offset += current_count;
+ }
+ }
+ }
+
+done:
+ WREG32(AVIVO_DC_I2C_STATUS1, (AVIVO_DC_I2C_DONE |
+ AVIVO_DC_I2C_NACK |
+ AVIVO_DC_I2C_HALT));
+ WREG32(AVIVO_DC_I2C_RESET, AVIVO_DC_I2C_SOFT_RESET);
+ udelay(1);
+ WREG32(AVIVO_DC_I2C_RESET, 0);
+
+ WREG32(AVIVO_DC_I2C_ARBITRATION, AVIVO_DC_I2C_SW_DONE_USING_I2C);
+ WREG32(AVIVO_DC_I2C_CONTROL1, saved1);
+ WREG32(0x494, saved2);
+ tmp = RREG32(RADEON_BIOS_6_SCRATCH);
+ tmp &= ~ATOM_S6_HW_I2C_BUSY_STATE;
+ WREG32(RADEON_BIOS_6_SCRATCH, tmp);
+
+ mutex_unlock(&rdev->pm.mutex);
+ mutex_unlock(&rdev->dc_hw_i2c_mutex);
+
+ return ret;
+}
+
+static int radeon_hw_i2c_xfer(struct i2c_adapter *i2c_adap,
+ struct i2c_msg *msgs, int num)
+{
+ struct radeon_i2c_chan *i2c = i2c_get_adapdata(i2c_adap);
+ struct radeon_device *rdev = i2c->dev->dev_private;
+ struct radeon_i2c_bus_rec *rec = &i2c->rec;
+ int ret = 0;
+
+ mutex_lock(&i2c->mutex);
+
+ switch (rdev->family) {
+ case CHIP_R100:
+ case CHIP_RV100:
+ case CHIP_RS100:
+ case CHIP_RV200:
+ case CHIP_RS200:
+ case CHIP_R200:
+ case CHIP_RV250:
+ case CHIP_RS300:
+ case CHIP_RV280:
+ case CHIP_R300:
+ case CHIP_R350:
+ case CHIP_RV350:
+ case CHIP_RV380:
+ case CHIP_R420:
+ case CHIP_R423:
+ case CHIP_RV410:
+ case CHIP_RS400:
+ case CHIP_RS480:
+ ret = r100_hw_i2c_xfer(i2c_adap, msgs, num);
+ break;
+ case CHIP_RS600:
+ case CHIP_RS690:
+ case CHIP_RS740:
+ /* XXX fill in hw i2c implementation */
+ break;
+ case CHIP_RV515:
+ case CHIP_R520:
+ case CHIP_RV530:
+ case CHIP_RV560:
+ case CHIP_RV570:
+ case CHIP_R580:
+ if (rec->mm_i2c)
+ ret = r100_hw_i2c_xfer(i2c_adap, msgs, num);
+ else
+ ret = r500_hw_i2c_xfer(i2c_adap, msgs, num);
+ break;
+ case CHIP_R600:
+ case CHIP_RV610:
+ case CHIP_RV630:
+ case CHIP_RV670:
+ /* XXX fill in hw i2c implementation */
+ break;
+ case CHIP_RV620:
+ case CHIP_RV635:
+ case CHIP_RS780:
+ case CHIP_RS880:
+ case CHIP_RV770:
+ case CHIP_RV730:
+ case CHIP_RV710:
+ case CHIP_RV740:
+ /* XXX fill in hw i2c implementation */
+ break;
+ case CHIP_CEDAR:
+ case CHIP_REDWOOD:
+ case CHIP_JUNIPER:
+ case CHIP_CYPRESS:
+ case CHIP_HEMLOCK:
+ /* XXX fill in hw i2c implementation */
+ break;
+ default:
+ DRM_ERROR("i2c: unhandled radeon chip\n");
+ ret = -EIO;
+ break;
+ }
+
+ mutex_unlock(&i2c->mutex);
+
+ return ret;
+}
+
+static u32 radeon_hw_i2c_func(struct i2c_adapter *adap)
+{
+ return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
+}
+
+static const struct i2c_algorithm radeon_i2c_algo = {
+ .master_xfer = radeon_hw_i2c_xfer,
+ .functionality = radeon_hw_i2c_func,
+};
+
+static const struct i2c_algorithm radeon_atom_i2c_algo = {
+ .master_xfer = radeon_atom_hw_i2c_xfer,
+ .functionality = radeon_atom_hw_i2c_func,
+};
+
+struct radeon_i2c_chan *radeon_i2c_create(struct drm_device *dev,
+ struct radeon_i2c_bus_rec *rec,
+ const char *name)
+{
+ struct radeon_device *rdev = dev->dev_private;
+ struct radeon_i2c_chan *i2c;
+ int ret;
+
+ /* don't add the mm_i2c bus unless hw_i2c is enabled */
+ if (rec->mm_i2c && (radeon_hw_i2c == 0))
+ return NULL;
+
+ i2c = kzalloc(sizeof(struct radeon_i2c_chan), GFP_KERNEL);
+ if (i2c == NULL)
+ return NULL;
+
+ i2c->rec = *rec;
+ i2c->adapter.owner = THIS_MODULE;
+ i2c->adapter.class = I2C_CLASS_DDC;
+ i2c->adapter.dev.parent = &dev->pdev->dev;
+ i2c->dev = dev;
+ i2c_set_adapdata(&i2c->adapter, i2c);
+ mutex_init(&i2c->mutex);
+ if (rec->mm_i2c ||
+ (rec->hw_capable &&
+ radeon_hw_i2c &&
+ ((rdev->family <= CHIP_RS480) ||
+ ((rdev->family >= CHIP_RV515) && (rdev->family <= CHIP_R580))))) {
+ /* set the radeon hw i2c adapter */
+ snprintf(i2c->adapter.name, sizeof(i2c->adapter.name),
+ "Radeon i2c hw bus %s", name);
+ i2c->adapter.algo = &radeon_i2c_algo;
+ ret = i2c_add_adapter(&i2c->adapter);
+ if (ret) {
+ DRM_ERROR("Failed to register hw i2c %s\n", name);
+ goto out_free;
+ }
+ } else if (rec->hw_capable &&
+ radeon_hw_i2c &&
+ ASIC_IS_DCE3(rdev)) {
+ /* hw i2c using atom */
+ snprintf(i2c->adapter.name, sizeof(i2c->adapter.name),
+ "Radeon i2c hw bus %s", name);
+ i2c->adapter.algo = &radeon_atom_i2c_algo;
+ ret = i2c_add_adapter(&i2c->adapter);
+ if (ret) {
+ DRM_ERROR("Failed to register hw i2c %s\n", name);
+ goto out_free;
+ }
+ } else {
+ /* set the radeon bit adapter */
+ snprintf(i2c->adapter.name, sizeof(i2c->adapter.name),
+ "Radeon i2c bit bus %s", name);
+ i2c->adapter.algo_data = &i2c->bit;
+ i2c->bit.pre_xfer = pre_xfer;
+ i2c->bit.post_xfer = post_xfer;
+ i2c->bit.setsda = set_data;
+ i2c->bit.setscl = set_clock;
+ i2c->bit.getsda = get_data;
+ i2c->bit.getscl = get_clock;
+ i2c->bit.udelay = 10;
+ i2c->bit.timeout = usecs_to_jiffies(2200); /* from VESA */
+ i2c->bit.data = i2c;
+ ret = i2c_bit_add_bus(&i2c->adapter);
+ if (ret) {
+ DRM_ERROR("Failed to register bit i2c %s\n", name);
+ goto out_free;
+ }
+ }
+
+ return i2c;
+out_free:
+ kfree(i2c);
+ return NULL;
+
+}
+
+void radeon_i2c_destroy(struct radeon_i2c_chan *i2c)
+{
+ if (!i2c)
+ return;
+ i2c_del_adapter(&i2c->adapter);
+ if (i2c->has_aux)
+ drm_dp_aux_unregister(&i2c->aux);
+ kfree(i2c);
+}
+
+/* Add the default buses */
+void radeon_i2c_init(struct radeon_device *rdev)
+{
+ if (radeon_hw_i2c)
+ DRM_INFO("hw_i2c forced on, you may experience display detection problems!\n");
+
+ if (rdev->is_atom_bios)
+ radeon_atombios_i2c_init(rdev);
+ else
+ radeon_combios_i2c_init(rdev);
+}
+
+/* remove all the buses */
+void radeon_i2c_fini(struct radeon_device *rdev)
+{
+ int i;
+
+ for (i = 0; i < RADEON_MAX_I2C_BUS; i++) {
+ if (rdev->i2c_bus[i]) {
+ radeon_i2c_destroy(rdev->i2c_bus[i]);
+ rdev->i2c_bus[i] = NULL;
+ }
+ }
+}
+
+/* Add additional buses */
+void radeon_i2c_add(struct radeon_device *rdev,
+ struct radeon_i2c_bus_rec *rec,
+ const char *name)
+{
+ struct drm_device *dev = rdev->ddev;
+ int i;
+
+ for (i = 0; i < RADEON_MAX_I2C_BUS; i++) {
+ if (!rdev->i2c_bus[i]) {
+ rdev->i2c_bus[i] = radeon_i2c_create(dev, rec, name);
+ return;
+ }
+ }
+}
+
+/* looks up bus based on id */
+struct radeon_i2c_chan *radeon_i2c_lookup(struct radeon_device *rdev,
+ struct radeon_i2c_bus_rec *i2c_bus)
+{
+ int i;
+
+ for (i = 0; i < RADEON_MAX_I2C_BUS; i++) {
+ if (rdev->i2c_bus[i] &&
+ (rdev->i2c_bus[i]->rec.i2c_id == i2c_bus->i2c_id)) {
+ return rdev->i2c_bus[i];
+ }
+ }
+ return NULL;
+}
+
+void radeon_i2c_get_byte(struct radeon_i2c_chan *i2c_bus,
+ u8 slave_addr,
+ u8 addr,
+ u8 *val)
+{
+ u8 out_buf[2];
+ u8 in_buf[2];
+ struct i2c_msg msgs[] = {
+ {
+ .addr = slave_addr,
+ .flags = 0,
+ .len = 1,
+ .buf = out_buf,
+ },
+ {
+ .addr = slave_addr,
+ .flags = I2C_M_RD,
+ .len = 1,
+ .buf = in_buf,
+ }
+ };
+
+ out_buf[0] = addr;
+ out_buf[1] = 0;
+
+ if (i2c_transfer(&i2c_bus->adapter, msgs, 2) == 2) {
+ *val = in_buf[0];
+ DRM_DEBUG("val = 0x%02x\n", *val);
+ } else {
+ DRM_DEBUG("i2c 0x%02x 0x%02x read failed\n",
+ addr, *val);
+ }
+}
+
+void radeon_i2c_put_byte(struct radeon_i2c_chan *i2c_bus,
+ u8 slave_addr,
+ u8 addr,
+ u8 val)
+{
+ uint8_t out_buf[2];
+ struct i2c_msg msg = {
+ .addr = slave_addr,
+ .flags = 0,
+ .len = 2,
+ .buf = out_buf,
+ };
+
+ out_buf[0] = addr;
+ out_buf[1] = val;
+
+ if (i2c_transfer(&i2c_bus->adapter, &msg, 1) != 1)
+ DRM_DEBUG("i2c 0x%02x 0x%02x write failed\n",
+ addr, val);
+}
+
+/* ddc router switching */
+void radeon_router_select_ddc_port(struct radeon_connector *radeon_connector)
+{
+ u8 val;
+
+ if (!radeon_connector->router.ddc_valid)
+ return;
+
+ if (!radeon_connector->router_bus)
+ return;
+
+ radeon_i2c_get_byte(radeon_connector->router_bus,
+ radeon_connector->router.i2c_addr,
+ 0x3, &val);
+ val &= ~radeon_connector->router.ddc_mux_control_pin;
+ radeon_i2c_put_byte(radeon_connector->router_bus,
+ radeon_connector->router.i2c_addr,
+ 0x3, val);
+ radeon_i2c_get_byte(radeon_connector->router_bus,
+ radeon_connector->router.i2c_addr,
+ 0x1, &val);
+ val &= ~radeon_connector->router.ddc_mux_control_pin;
+ val |= radeon_connector->router.ddc_mux_state;
+ radeon_i2c_put_byte(radeon_connector->router_bus,
+ radeon_connector->router.i2c_addr,
+ 0x1, val);
+}
+
+/* clock/data router switching */
+void radeon_router_select_cd_port(struct radeon_connector *radeon_connector)
+{
+ u8 val;
+
+ if (!radeon_connector->router.cd_valid)
+ return;
+
+ if (!radeon_connector->router_bus)
+ return;
+
+ radeon_i2c_get_byte(radeon_connector->router_bus,
+ radeon_connector->router.i2c_addr,
+ 0x3, &val);
+ val &= ~radeon_connector->router.cd_mux_control_pin;
+ radeon_i2c_put_byte(radeon_connector->router_bus,
+ radeon_connector->router.i2c_addr,
+ 0x3, val);
+ radeon_i2c_get_byte(radeon_connector->router_bus,
+ radeon_connector->router.i2c_addr,
+ 0x1, &val);
+ val &= ~radeon_connector->router.cd_mux_control_pin;
+ val |= radeon_connector->router.cd_mux_state;
+ radeon_i2c_put_byte(radeon_connector->router_bus,
+ radeon_connector->router.i2c_addr,
+ 0x1, val);
+}
+
Code Review / kvmfornfv.git / blobdiff