Video Traffic Advance Communication Rx and Tx drivers are designed for inter-die communication.
Signed-off-by: Benjamin Gaignard benjamin.gaignard@linaro.org Reviewed-by: Rob Clark robdclark@gmail.com --- drivers/gpu/drm/sti/Makefile | 3 +- drivers/gpu/drm/sti/sti_vtac.c | 215 +++++++++++++++++++++++++++++++++++++++++ 2 files changed, 217 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 1759c20..1534d4c 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 \ No newline at end of file diff --git a/drivers/gpu/drm/sti/sti_vtac.c b/drivers/gpu/drm/sti/sti_vtac.c new file mode 100644 index 0000000..82a51d4 --- /dev/null +++ b/drivers/gpu/drm/sti/sti_vtac.c @@ -0,0 +1,215 @@ +/* + * Copyright (C) STMicroelectronics SA 2014 + * Author: Benjamin Gaignard benjamin.gaignard@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); + +MODULE_AUTHOR("Benjamin Gaignard benjamin.gaignard@st.com"); +MODULE_DESCRIPTION("STMicroelectronics SoC DRM driver"); +MODULE_LICENSE("GPL");