diff options
Diffstat (limited to 'arch/powerpc/platforms/85xx/t1042rdb_diu.c')
| -rw-r--r-- | arch/powerpc/platforms/85xx/t1042rdb_diu.c | 152 |
1 files changed, 152 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/85xx/t1042rdb_diu.c b/arch/powerpc/platforms/85xx/t1042rdb_diu.c new file mode 100644 index 000000000..767eed98a --- /dev/null +++ b/arch/powerpc/platforms/85xx/t1042rdb_diu.c @@ -0,0 +1,152 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * T1042 platform DIU operation + * + * Copyright 2014 Freescale Semiconductor Inc. + */ + +#include <linux/init.h> +#include <linux/io.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/of_address.h> + +#include <sysdev/fsl_soc.h> + +/*DIU Pixel ClockCR offset in scfg*/ +#define CCSR_SCFG_PIXCLKCR 0x28 + +/* DIU Pixel Clock bits of the PIXCLKCR */ +#define PIXCLKCR_PXCKEN 0x80000000 +#define PIXCLKCR_PXCKINV 0x40000000 +#define PIXCLKCR_PXCKDLY 0x0000FF00 +#define PIXCLKCR_PXCLK_MASK 0x00FF0000 + +/* Some CPLD register definitions */ +#define CPLD_DIUCSR 0x16 +#define CPLD_DIUCSR_DVIEN 0x80 +#define CPLD_DIUCSR_BACKLIGHT 0x0f + +struct device_node *cpld_node; + +/** + * t1042rdb_set_monitor_port: switch the output to a different monitor port + */ +static void t1042rdb_set_monitor_port(enum fsl_diu_monitor_port port) +{ + void __iomem *cpld_base; + + cpld_base = of_iomap(cpld_node, 0); + if (!cpld_base) { + pr_err("%s: Could not map cpld registers\n", __func__); + goto exit; + } + + switch (port) { + case FSL_DIU_PORT_DVI: + /* Enable the DVI(HDMI) port, disable the DFP and + * the backlight + */ + clrbits8(cpld_base + CPLD_DIUCSR, CPLD_DIUCSR_DVIEN); + break; + case FSL_DIU_PORT_LVDS: + /* + * LVDS also needs backlight enabled, otherwise the display + * will be blank. + */ + /* Enable the DFP port, disable the DVI*/ + setbits8(cpld_base + CPLD_DIUCSR, 0x01 << 8); + setbits8(cpld_base + CPLD_DIUCSR, 0x01 << 4); + setbits8(cpld_base + CPLD_DIUCSR, CPLD_DIUCSR_BACKLIGHT); + break; + default: + pr_err("%s: Unsupported monitor port %i\n", __func__, port); + } + + iounmap(cpld_base); +exit: + of_node_put(cpld_node); +} + +/** + * t1042rdb_set_pixel_clock: program the DIU's clock + * @pixclock: pixel clock in ps (pico seconds) + */ +static void t1042rdb_set_pixel_clock(unsigned int pixclock) +{ + struct device_node *scfg_np; + void __iomem *scfg; + unsigned long freq; + u64 temp; + u32 pxclk; + + scfg_np = of_find_compatible_node(NULL, NULL, "fsl,t1040-scfg"); + if (!scfg_np) { + pr_err("%s: Missing scfg node. Can not display video.\n", + __func__); + return; + } + + scfg = of_iomap(scfg_np, 0); + of_node_put(scfg_np); + if (!scfg) { + pr_err("%s: Could not map device. Can not display video.\n", + __func__); + return; + } + + /* Convert pixclock into frequency */ + temp = 1000000000000ULL; + do_div(temp, pixclock); + freq = temp; + + /* + * 'pxclk' is the ratio of the platform clock to the pixel clock. + * This number is programmed into the PIXCLKCR register, and the valid + * range of values is 2-255. + */ + pxclk = DIV_ROUND_CLOSEST(fsl_get_sys_freq(), freq); + pxclk = clamp_t(u32, pxclk, 2, 255); + + /* Disable the pixel clock, and set it to non-inverted and no delay */ + clrbits32(scfg + CCSR_SCFG_PIXCLKCR, + PIXCLKCR_PXCKEN | PIXCLKCR_PXCKDLY | PIXCLKCR_PXCLK_MASK); + + /* Enable the clock and set the pxclk */ + setbits32(scfg + CCSR_SCFG_PIXCLKCR, PIXCLKCR_PXCKEN | (pxclk << 16)); + + iounmap(scfg); +} + +/** + * t1042rdb_valid_monitor_port: set the monitor port for sysfs + */ +static enum fsl_diu_monitor_port +t1042rdb_valid_monitor_port(enum fsl_diu_monitor_port port) +{ + switch (port) { + case FSL_DIU_PORT_DVI: + case FSL_DIU_PORT_LVDS: + return port; + default: + return FSL_DIU_PORT_DVI; /* Dual-link LVDS is not supported */ + } +} + +static int __init t1042rdb_diu_init(void) +{ + cpld_node = of_find_compatible_node(NULL, NULL, "fsl,t1042rdb-cpld"); + if (!cpld_node) + return 0; + + diu_ops.set_monitor_port = t1042rdb_set_monitor_port; + diu_ops.set_pixel_clock = t1042rdb_set_pixel_clock; + diu_ops.valid_monitor_port = t1042rdb_valid_monitor_port; + + return 0; +} + +early_initcall(t1042rdb_diu_init); + +MODULE_LICENSE("GPL"); |