1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * TI j721e Cadence DSI wrapper 4 * 5 * Copyright (C) 2022 Texas Instruments Incorporated - http://www.ti.com/ 6 * Author: Rahul T R <r-ravikumar@ti.com> 7 */ 8 9 #include <linux/io.h> 10 #include <linux/platform_device.h> 11 12 #include "cdns-dsi-j721e.h" 13 14 #define DSI_WRAP_REVISION 0x0 15 #define DSI_WRAP_DPI_CONTROL 0x4 16 #define DSI_WRAP_DSC_CONTROL 0x8 17 #define DSI_WRAP_DPI_SECURE 0xc 18 #define DSI_WRAP_DSI_0_ASF_STATUS 0x10 19 20 #define DSI_WRAP_DPI_0_EN BIT(0) 21 #define DSI_WRAP_DSI2_MUX_SEL BIT(4) 22 23 static int cdns_dsi_j721e_init(struct cdns_dsi *dsi) 24 { 25 struct platform_device *pdev = to_platform_device(dsi->base.dev); 26 27 dsi->j721e_regs = devm_platform_ioremap_resource(pdev, 1); 28 return PTR_ERR_OR_ZERO(dsi->j721e_regs); 29 } 30 31 static void cdns_dsi_j721e_enable(struct cdns_dsi *dsi) 32 { 33 /* 34 * Enable DPI0 as its input. DSS0 DPI2 is connected 35 * to DSI DPI0. This is the only supported configuration on 36 * J721E. 37 */ 38 writel(DSI_WRAP_DPI_0_EN, dsi->j721e_regs + DSI_WRAP_DPI_CONTROL); 39 } 40 41 static void cdns_dsi_j721e_disable(struct cdns_dsi *dsi) 42 { 43 /* Put everything to defaults */ 44 writel(0, dsi->j721e_regs + DSI_WRAP_DPI_CONTROL); 45 } 46 47 const struct cdns_dsi_platform_ops dsi_ti_j721e_ops = { 48 .init = cdns_dsi_j721e_init, 49 .enable = cdns_dsi_j721e_enable, 50 .disable = cdns_dsi_j721e_disable, 51 }; 52