Video Trafic Advance Communication Rx and Tx drivers are designed for inter-die communication.
Both Tx and Rx must share the same configuration to communicate that is why vtac_mode[] is shared in sti_vtac_utils.h.
Signed-off-by: Benjamin Gaignard benjamin.gaignard@linaro.org Signed-off-by: Vincent Abriou vincent.abriou@st.com Signed-off-by: Fabien Dessenne fabien.dessenne@st.com --- drivers/gpu/drm/sti/Kconfig | 6 ++ drivers/gpu/drm/sti/Makefile | 1 + drivers/gpu/drm/sti/sti_vtac_rx.c | 140 ++++++++++++++++++++++++++++++++ drivers/gpu/drm/sti/sti_vtac_tx.c | 152 +++++++++++++++++++++++++++++++++++ drivers/gpu/drm/sti/sti_vtac_utils.h | 52 ++++++++++++ 5 files changed, 351 insertions(+) create mode 100644 drivers/gpu/drm/sti/sti_vtac_rx.c create mode 100644 drivers/gpu/drm/sti/sti_vtac_tx.c create mode 100644 drivers/gpu/drm/sti/sti_vtac_utils.h
diff --git a/drivers/gpu/drm/sti/Kconfig b/drivers/gpu/drm/sti/Kconfig index b3c751c..e33b618 100644 --- a/drivers/gpu/drm/sti/Kconfig +++ b/drivers/gpu/drm/sti/Kconfig @@ -4,6 +4,12 @@ config DRM_STI help Choose this option to enable DRM on STM stiH41x chipset
+config VTAC_STI + tristate "Video Trafic Advance Communication Rx and Tx for STMicroelectronics SoC stiH41x Series" + depends on DRM_STI + help + Choose this option to enable VTAC on STM stiH41x chipset + config VTG_STI tristate "Video Timing Generator for STMicroelectronics SoC stiH41x Series" depends on DRM_STI diff --git a/drivers/gpu/drm/sti/Makefile b/drivers/gpu/drm/sti/Makefile index 33216e1..79fdcb6 100644 --- a/drivers/gpu/drm/sti/Makefile +++ b/drivers/gpu/drm/sti/Makefile @@ -1,3 +1,4 @@ ccflags-y := -Iinclude/drm
+obj-$(CONFIG_VTAC_STI) += sti_vtac_tx.o sti_vtac_rx.o obj-$(CONFIG_VTG_STI) += sti_vtg.o sti_vtg_utils.o diff --git a/drivers/gpu/drm/sti/sti_vtac_rx.c b/drivers/gpu/drm/sti/sti_vtac_rx.c new file mode 100644 index 0000000..c089489 --- /dev/null +++ b/drivers/gpu/drm/sti/sti_vtac_rx.c @@ -0,0 +1,140 @@ +/* + * Copyright (C) STMicroelectronics SA 2013 + * 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> + +#include "sti_vtac_utils.h" + +#define VTAC_RX_CONFIG 0x00 +#define VTAC_RX_FIFO_CONFIG 0x04 + +#define VTAC_SW_RST_AUTOC 0x02 +#define VTAC_FIFO_CONFIG_VAL 0x04 + +/* + * VTAC RX structure + * + * @dev: pointer to device structure + * @regs: ioremapped regsiters + * @clk: clock + * @type: main or aux device + */ +struct sti_vtac_rx { + struct device *dev; + void __iomem *regs; + struct clk *clk; + int type; +}; + +static void sti_vtac_rx_reg_dump(struct sti_vtac_rx *vtac_rx) +{ + dev_dbg(vtac_rx->dev, "vtac_rx->regs %p\n", vtac_rx->regs); + dev_dbg(vtac_rx->dev, "VTAC_RX_CONFIG 0x%x\n", + readl(vtac_rx->regs + VTAC_RX_CONFIG)); + dev_dbg(vtac_rx->dev, "VTAC_RX_FIFO_CONFIG 0x%x\n", + readl(vtac_rx->regs + VTAC_RX_FIFO_CONFIG)); +} + +static void sti_vtac_rx_set_config(struct sti_vtac_rx *vtac_rx) +{ + int i; + u32 rx_config = EVEN_PARITY | ODD_PARITY | SW_RST_AUTOC | ENABLE; + + /* Enable VTAC clock */ + if (clk_prepare_enable(vtac_rx->clk)) + DRM_ERROR("Failed to prepare/enable vtac_rx clock.\n"); + + for (i = 0; i < ARRAY_SIZE(vtac_modes); i++) { + if (vtac_modes[i].type == vtac_rx->type) { + writel(VTAC_FIFO_CONFIG_VAL, + vtac_rx->regs + VTAC_RX_FIFO_CONFIG); + rx_config |= vtac_modes[i].vid_in_width << 4; + rx_config |= vtac_modes[i].phyts_width << 16; + rx_config |= vtac_modes[i].phyts_per_pixel << 23; + rx_config |= VTAC_SW_RST_AUTOC; + writel(rx_config, vtac_rx->regs + VTAC_RX_CONFIG); + } + } +} + +static int sti_vtac_rx_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct device_node *np = dev->of_node; + struct sti_vtac_rx *vtac_rx; + struct resource *res; + + vtac_rx = devm_kzalloc(dev, sizeof(*vtac_rx), GFP_KERNEL); + if (!vtac_rx) { + DRM_ERROR("Failed to allocate VTAC RX context\n"); + return -ENOMEM; + } + vtac_rx->dev = dev; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) { + DRM_ERROR("Invalid resource\n"); + return -ENOMEM; + } + vtac_rx->regs = devm_ioremap_resource(dev, res); + if (IS_ERR(vtac_rx->regs)) + return PTR_ERR(vtac_rx->regs); + + vtac_rx->type = VTAC_MAIN; + if (np) + if (of_property_read_bool(np, "vtac-rx-aux")) + vtac_rx->type = VTAC_AUX; + + if (vtac_rx->type == VTAC_MAIN) { + vtac_rx->clk = devm_clk_get(dev, "vtac_main_phy"); + if (IS_ERR(vtac_rx->clk)) { + DRM_ERROR("Cannot get vtac_main_phy clock\n"); + return PTR_ERR(vtac_rx->clk); + } + } else { + vtac_rx->clk = devm_clk_get(dev, "vtac_aux_phy"); + if (IS_ERR(vtac_rx->clk)) { + DRM_ERROR("Cannot get vtac_aux_phy clock\n"); + return PTR_ERR(vtac_rx->clk); + } + } + + sti_vtac_rx_set_config(vtac_rx); + sti_vtac_rx_reg_dump(vtac_rx); + + platform_set_drvdata(pdev, vtac_rx); + DRM_INFO("%s VTAC RX %s\n", __func__, + vtac_rx->type == VTAC_MAIN ? "main" : "aux"); + return 0; +} + +static struct of_device_id vtac_rx_match_types[] = { + { + .compatible = "st,stih416-vtac-rx", + }, { + /* end node */ + } +}; + +MODULE_DEVICE_TABLE(of, vtac_rx_match_types); + +struct platform_driver sti_vtac_rx_driver = { + .driver = { + .name = "sti-vtac-rx", + .owner = THIS_MODULE, + .of_match_table = vtac_rx_match_types, + }, + .probe = sti_vtac_rx_probe, +}; + +MODULE_AUTHOR("Benjamin Gaignard benjamin.gaignard@st.com"); +MODULE_DESCRIPTION("STMicroelectronics SoC VTAC_RX driver"); +MODULE_LICENSE("GPL"); diff --git a/drivers/gpu/drm/sti/sti_vtac_tx.c b/drivers/gpu/drm/sti/sti_vtac_tx.c new file mode 100644 index 0000000..807d2e9 --- /dev/null +++ b/drivers/gpu/drm/sti/sti_vtac_tx.c @@ -0,0 +1,152 @@ +/* + * Copyright (C) STMicroelectronics SA 2013 + * 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> + +#include "sti_vtac_utils.h" + +#define VTAC_TX_CONFIG 0x00 + +#define VTAC_SW_RST_AUTOC 0x02 + +#define VTAC_TX_PHY_ENABLE_CLK_PHY (0x01 << 0) +#define VTAC_TX_PHY_PROG_N3 (0x04 << 7) +#define VTAC_TX_PHY_ENABLE_CLK_DLL (0x01 << 1) +#define VTAC_TX_PHY_RST_N_DLL_SWITCH (0x01 << 4) +#define VTAC_TX_PHY_PLL_NOT_OSC_MODE (0x01 << 3) + +/* + * VTAC TX structure + * + * @dev: pointer to device structure + * @regs: ioremapped regsiters + * @clk: clock + * @type: main or aux device + */ +struct sti_vtac_tx { + struct device *dev; + void __iomem *tx_regs; + void __iomem *phy_regs; + struct clk *clk; + int type; +}; + +static void sti_vtac_tx_set_config(struct sti_vtac_tx *vtac_tx) +{ + int i; + u32 phy_config; + u32 tx_config = EVEN_PARITY | ODD_PARITY | SW_RST_AUTOC | ENABLE; + + /* Enable VTAC clock */ + if (clk_prepare_enable(vtac_tx->clk)) + DRM_ERROR("Failed to prepare/enable vtac_tx clock.\n"); + + /* Configure vtac phy */ + phy_config = 0x00000000; + writel(phy_config, vtac_tx->phy_regs + 0x828); /* SYS_CFG8522 */ + phy_config = VTAC_TX_PHY_ENABLE_CLK_PHY; + writel(phy_config, vtac_tx->phy_regs + 0x824); /* SYS_CFG8521 */ + phy_config = readl(vtac_tx->phy_regs + 0x824); + phy_config |= VTAC_TX_PHY_PROG_N3; + writel(phy_config, vtac_tx->phy_regs + 0x824); /* SYS_CFG8521 */ + phy_config = readl(vtac_tx->phy_regs + 0x824); + phy_config |= VTAC_TX_PHY_ENABLE_CLK_DLL; + writel(phy_config, vtac_tx->phy_regs + 0x824); /* SYS_CFG8521 */ + phy_config = readl(vtac_tx->phy_regs + 0x824); + phy_config |= VTAC_TX_PHY_RST_N_DLL_SWITCH; + writel(phy_config, vtac_tx->phy_regs + 0x824); /* SYS_CFG8521 */ + phy_config = readl(vtac_tx->phy_regs + 0x824); + phy_config |= VTAC_TX_PHY_PLL_NOT_OSC_MODE; + writel(phy_config, vtac_tx->phy_regs + 0x824); /* SYS_CFG8521 */ + + /* Configure vtac tx */ + for (i = 0; i < ARRAY_SIZE(vtac_modes); i++) { + if (vtac_modes[i].type == vtac_tx->type) { + tx_config |= vtac_modes[i].vid_in_width << 4; + tx_config |= vtac_modes[i].phyts_width << 16; + tx_config |= vtac_modes[i].phyts_per_pixel << 23; + tx_config |= VTAC_SW_RST_AUTOC; + writel(tx_config, vtac_tx->tx_regs + VTAC_TX_CONFIG); + } + } +} + +static int sti_vtac_tx_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct device_node *np = dev->of_node; + struct sti_vtac_tx *vtac_tx; + struct resource *res; + + vtac_tx = devm_kzalloc(dev, sizeof(*vtac_tx), GFP_KERNEL); + if (!vtac_tx) { + DRM_ERROR("Failed to allocate VTAC TX context\n"); + return -ENOMEM; + } + vtac_tx->dev = dev; + + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "vtac-tx"); + if (!res) { + DRM_ERROR("Invalid resource 'vtac-tx'\n"); + return -ENOMEM; + } + vtac_tx->tx_regs = devm_ioremap_resource(dev, res); + if (IS_ERR(vtac_tx->tx_regs)) + return PTR_ERR(vtac_tx->tx_regs); + + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "vtac-phy"); + if (!res) { + DRM_ERROR("Invalid resource 'vtac-phy'\n"); + return -ENOMEM; + } + vtac_tx->phy_regs = devm_ioremap_nocache(dev, res->start, + resource_size(res)); + if (IS_ERR(vtac_tx->phy_regs)) + return PTR_ERR(vtac_tx->phy_regs); + + vtac_tx->type = VTAC_MAIN; + if (np) + if (of_property_read_bool(np, "vtac-tx-aux")) + vtac_tx->type = VTAC_AUX; + + vtac_tx->clk = devm_clk_get(dev, "vtac_tx_phy"); + if (IS_ERR(vtac_tx->clk)) { + DRM_ERROR("Cannot get vtac_tx_phy clock\n"); + return PTR_ERR(vtac_tx->clk); + } + + sti_vtac_tx_set_config(vtac_tx); + + platform_set_drvdata(pdev, vtac_tx); + DRM_INFO("%s VTAC TX %s\n", __func__, + vtac_tx->type == VTAC_MAIN ? "main" : "aux"); + return 0; +} + +static struct of_device_id vtac_tx_match_types[] = { + { + .compatible = "st,stih416-vtac-tx", + }, { + /* end node */ + } +}; + +struct platform_driver sti_vtac_tx_driver = { + .driver = { + .name = "sti-vtac-tx", + .owner = THIS_MODULE, + .of_match_table = vtac_tx_match_types, + }, + .probe = sti_vtac_tx_probe, +}; + +MODULE_AUTHOR("Benjamin Gaignard benjamin.gaignard@st.com"); +MODULE_DESCRIPTION("STMicroelectronics SoC VTAC_TX driver"); +MODULE_LICENSE("GPL"); diff --git a/drivers/gpu/drm/sti/sti_vtac_utils.h b/drivers/gpu/drm/sti/sti_vtac_utils.h new file mode 100644 index 0000000..ce549de --- /dev/null +++ b/drivers/gpu/drm/sti/sti_vtac_utils.h @@ -0,0 +1,52 @@ +/* + * Copyright (C) STMicroelectronics SA 2013 + * Author: Benjamin Gaignard benjamin.gaignard@st.com for STMicroelectronics. + * License terms: GNU General Public License (GPL), version 2 + */ + +#ifndef _STI_VTAC_UTILS_H_ +#define _STI_VTAC_UTILS_H_ + +#define VTAC_MAIN 0x8000 +#define VTAC_AUX 0x4000 + +/* 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 EVEN_PARITY (1 << 13) +#define ODD_PARITY (1 << 12) +#define SW_RST_AUTOC (1 << 1) +#define ENABLE (1 << 0) + +/* + * VTAC mode structure + * + * @type: main, aux or dvo device + * @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 { + int type; + int vid_in_width; + int phyts_width; + int phyts_per_pixel; +}; + +static struct sti_vtac_mode vtac_modes[] = { + {VTAC_MAIN, 0x2, 0x2, VTAC_5_PPP}, /* Main RGB 12 */ + {VTAC_AUX, 0x1, 0x0, VTAC_17_PPP}, /* Aux 10 */ +}; + +#endif