[PATCH v4 03/11] drm: sti: add VTAC drivers
Benjamin Gaignard
benjamin.gaignard at linaro.org
Wed May 28 23:36:59 PDT 2014
Video Traffic Advance Communication Rx and Tx drivers are designed
for inter-die communication.
Signed-off-by: Benjamin Gaignard <benjamin.gaignard at linaro.org>
---
drivers/gpu/drm/sti/Makefile | 3 +-
drivers/gpu/drm/sti/sti_vtac.c | 211 +++++++++++++++++++++++++++++++++++++++++
2 files changed, 213 insertions(+), 1 deletion(-)
create mode 100644 drivers/gpu/drm/sti/sti_vtac.c
diff --git a/drivers/gpu/drm/sti/Makefile b/drivers/gpu/drm/sti/Makefile
index 3658a13e..52e2e80 100644
--- a/drivers/gpu/drm/sti/Makefile
+++ b/drivers/gpu/drm/sti/Makefile
@@ -1,2 +1,3 @@
obj-$(CONFIG_DRM_STI) += \
- sti_vtg.o
+ sti_vtg.o \
+ sti_vtac.o
diff --git a/drivers/gpu/drm/sti/sti_vtac.c b/drivers/gpu/drm/sti/sti_vtac.c
new file mode 100644
index 0000000..5226a04
--- /dev/null
+++ b/drivers/gpu/drm/sti/sti_vtac.c
@@ -0,0 +1,211 @@
+/*
+ * Copyright (C) STMicroelectronics SA 2014
+ * Author: Benjamin Gaignard <benjamin.gaignard at st.com> for STMicroelectronics.
+ * License terms: GNU General Public License (GPL), version 2
+ */
+
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+
+#include <drm/drmP.h>
+
+/* registers offset */
+#define VTAC_CONFIG 0x00
+#define VTAC_RX_FIFO_CONFIG 0x04
+#define VTAC_FIFO_CONFIG_VAL 0x04
+
+#define VTAC_SYS_CFG8521 0x824
+#define VTAC_SYS_CFG8522 0x828
+
+/* Number of phyts per pixel */
+#define VTAC_2_5_PPP 0x0005
+#define VTAC_3_PPP 0x0006
+#define VTAC_4_PPP 0x0008
+#define VTAC_5_PPP 0x000A
+#define VTAC_6_PPP 0x000C
+#define VTAC_13_PPP 0x001A
+#define VTAC_14_PPP 0x001C
+#define VTAC_15_PPP 0x001E
+#define VTAC_16_PPP 0x0020
+#define VTAC_17_PPP 0x0022
+#define VTAC_18_PPP 0x0024
+
+/* enable bits */
+#define VTAC_ENABLE 0x3003
+
+#define VTAC_TX_PHY_ENABLE_CLK_PHY BIT(0)
+#define VTAC_TX_PHY_ENABLE_CLK_DLL BIT(1)
+#define VTAC_TX_PHY_PLL_NOT_OSC_MODE BIT(3)
+#define VTAC_TX_PHY_RST_N_DLL_SWITCH BIT(4)
+#define VTAC_TX_PHY_PROG_N3 BIT(9)
+
+
+/**
+ * VTAC mode structure
+ *
+ * @vid_in_width: Video Data Resolution
+ * @phyts_width: Width of phyt buses(phyt low and phyt high).
+ * @phyts_per_pixel: Number of phyts sent per pixel
+ */
+struct sti_vtac_mode {
+ u32 vid_in_width;
+ u32 phyts_width;
+ u32 phyts_per_pixel;
+};
+
+static const struct sti_vtac_mode vtac_mode_main = {0x2, 0x2, VTAC_5_PPP};
+static const struct sti_vtac_mode vtac_mode_aux = {0x1, 0x0, VTAC_17_PPP};
+
+/**
+ * VTAC structure
+ *
+ * @dev: pointer to device structure
+ * @regs: ioremapped registers for RX and TX devices
+ * @phy_regs: phy registers for TX device
+ * @clk: clock
+ * @mode: main or auxillary configuration mode
+ */
+struct sti_vtac {
+ struct device *dev;
+ void __iomem *regs;
+ void __iomem *phy_regs;
+ struct clk *clk;
+ const struct sti_vtac_mode *mode;
+};
+
+static void sti_vtac_rx_set_config(struct sti_vtac *vtac)
+{
+ u32 config;
+
+ /* Enable VTAC clock */
+ if (clk_prepare_enable(vtac->clk))
+ DRM_ERROR("Failed to prepare/enable vtac_rx clock.\n");
+
+ writel(VTAC_FIFO_CONFIG_VAL, vtac->regs + VTAC_RX_FIFO_CONFIG);
+
+ config = VTAC_ENABLE;
+ config |= vtac->mode->vid_in_width << 4;
+ config |= vtac->mode->phyts_width << 16;
+ config |= vtac->mode->phyts_per_pixel << 23;
+ writel(config, vtac->regs + VTAC_CONFIG);
+}
+
+static void sti_vtac_tx_set_config(struct sti_vtac *vtac)
+{
+ u32 phy_config;
+ u32 config;
+
+ /* Enable VTAC clock */
+ if (clk_prepare_enable(vtac->clk))
+ DRM_ERROR("Failed to prepare/enable vtac_tx clock.\n");
+
+ /* Configure vtac phy */
+ phy_config = 0x00000000;
+ writel(phy_config, vtac->phy_regs + VTAC_SYS_CFG8522);
+ phy_config = VTAC_TX_PHY_ENABLE_CLK_PHY;
+ writel(phy_config, vtac->phy_regs + VTAC_SYS_CFG8521);
+ phy_config = readl(vtac->phy_regs + VTAC_SYS_CFG8521);
+ phy_config |= VTAC_TX_PHY_PROG_N3;
+ writel(phy_config, vtac->phy_regs + VTAC_SYS_CFG8521);
+ phy_config = readl(vtac->phy_regs + VTAC_SYS_CFG8521);
+ phy_config |= VTAC_TX_PHY_ENABLE_CLK_DLL;
+ writel(phy_config, vtac->phy_regs + VTAC_SYS_CFG8521);
+ phy_config = readl(vtac->phy_regs + VTAC_SYS_CFG8521);
+ phy_config |= VTAC_TX_PHY_RST_N_DLL_SWITCH;
+ writel(phy_config, vtac->phy_regs + VTAC_SYS_CFG8521);
+ phy_config = readl(vtac->phy_regs + VTAC_SYS_CFG8521);
+ phy_config |= VTAC_TX_PHY_PLL_NOT_OSC_MODE;
+ writel(phy_config, vtac->phy_regs + VTAC_SYS_CFG8521);
+
+ /* Configure vtac tx */
+ config = VTAC_ENABLE;
+ config |= vtac->mode->vid_in_width << 4;
+ config |= vtac->mode->phyts_width << 16;
+ config |= vtac->mode->phyts_per_pixel << 23;
+ writel(config, vtac->regs + VTAC_CONFIG);
+}
+
+static const struct of_device_id vtac_of_match[] = {
+ {
+ .compatible = "st,vtac-main",
+ .data = &vtac_mode_main,
+ }, {
+ .compatible = "st,vtac-aux",
+ .data = &vtac_mode_aux,
+ }, {
+ /* end node */
+ }
+};
+MODULE_DEVICE_TABLE(of, vtac_of_match);
+
+static int sti_vtac_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct device_node *np = dev->of_node;
+ const struct of_device_id *id;
+ struct sti_vtac *vtac;
+ struct resource *res;
+
+ vtac = devm_kzalloc(dev, sizeof(*vtac), GFP_KERNEL);
+ if (!vtac)
+ return -ENOMEM;
+
+ vtac->dev = dev;
+
+ id = of_match_node(vtac_of_match, np);
+ if (!id)
+ return -ENOMEM;
+
+ vtac->mode = id->data;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res) {
+ DRM_ERROR("Invalid resource\n");
+ return -ENOMEM;
+ }
+ vtac->regs = devm_ioremap_resource(dev, res);
+ if (IS_ERR(vtac->regs))
+ return PTR_ERR(vtac->regs);
+
+
+ vtac->clk = devm_clk_get(dev, "vtac");
+ if (IS_ERR(vtac->clk)) {
+ DRM_ERROR("Cannot get vtac clock\n");
+ return PTR_ERR(vtac->clk);
+ }
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+ if (res) {
+ vtac->phy_regs = devm_ioremap_nocache(dev, res->start,
+ resource_size(res));
+ sti_vtac_tx_set_config(vtac);
+ } else {
+
+ sti_vtac_rx_set_config(vtac);
+ }
+
+ platform_set_drvdata(pdev, vtac);
+ DRM_INFO("%s %s\n", __func__, dev_name(vtac->dev));
+
+ return 0;
+}
+
+static int sti_vtac_remove(struct platform_device *pdev)
+{
+ return 0;
+}
+
+struct platform_driver sti_vtac_driver = {
+ .driver = {
+ .name = "sti-vtac",
+ .owner = THIS_MODULE,
+ .of_match_table = vtac_of_match,
+ },
+ .probe = sti_vtac_probe,
+ .remove = sti_vtac_remove,
+};
+
+module_platform_driver(sti_vtac_driver);
--
1.9.1
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