diff options
Diffstat (limited to 'drivers/staging/imx-drm/ipu-v3/ipu-di.c')
| -rw-r--r-- | drivers/staging/imx-drm/ipu-v3/ipu-di.c | 700 |
1 files changed, 700 insertions, 0 deletions
diff --git a/drivers/staging/imx-drm/ipu-v3/ipu-di.c b/drivers/staging/imx-drm/ipu-v3/ipu-di.c new file mode 100644 index 000000000000..67d974f7be36 --- /dev/null +++ b/drivers/staging/imx-drm/ipu-v3/ipu-di.c @@ -0,0 +1,700 @@ +/* + * Copyright (c) 2010 Sascha Hauer <s.hauer@pengutronix.de> + * Copyright (C) 2005-2009 Freescale Semiconductor, Inc. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version 2 of the License, or (at your + * option) any later version. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY + * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * for more details. + */ +#include <linux/export.h> +#include <linux/module.h> +#include <linux/types.h> +#include <linux/errno.h> +#include <linux/io.h> +#include <linux/err.h> +#include <linux/platform_device.h> +#include <linux/clk.h> +#include <linux/clk-provider.h> +#include <linux/clkdev.h> + +#include "imx-ipu-v3.h" +#include "ipu-prv.h" + +struct ipu_di { + void __iomem *base; + int id; + u32 module; + struct clk *clk_di; /* display input clock */ + struct clk *clk_ipu; /* IPU bus clock */ + struct clk *clk_di_pixel; /* resulting pixel clock */ + struct clk_hw clk_hw_out; + char *clk_name; + bool inuse; + unsigned long clkflags; + struct ipu_soc *ipu; +}; + +static DEFINE_MUTEX(di_mutex); + +struct di_sync_config { + int run_count; + int run_src; + int offset_count; + int offset_src; + int repeat_count; + int cnt_clr_src; + int cnt_polarity_gen_en; + int cnt_polarity_clr_src; + int cnt_polarity_trigger_src; + int cnt_up; + int cnt_down; +}; + +enum di_pins { + DI_PIN11 = 0, + DI_PIN12 = 1, + DI_PIN13 = 2, + DI_PIN14 = 3, + DI_PIN15 = 4, + DI_PIN16 = 5, + DI_PIN17 = 6, + DI_PIN_CS = 7, + + DI_PIN_SER_CLK = 0, + DI_PIN_SER_RS = 1, +}; + +enum di_sync_wave { + DI_SYNC_NONE = 0, + DI_SYNC_CLK = 1, + DI_SYNC_INT_HSYNC = 2, + DI_SYNC_HSYNC = 3, + DI_SYNC_VSYNC = 4, + DI_SYNC_DE = 6, +}; + +#define SYNC_WAVE 0 + +#define DI_GENERAL 0x0000 +#define DI_BS_CLKGEN0 0x0004 +#define DI_BS_CLKGEN1 0x0008 +#define DI_SW_GEN0(gen) (0x000c + 4 * ((gen) - 1)) +#define DI_SW_GEN1(gen) (0x0030 + 4 * ((gen) - 1)) +#define DI_STP_REP(gen) (0x0148 + 4 * (((gen) - 1)/2)) +#define DI_SYNC_AS_GEN 0x0054 +#define DI_DW_GEN(gen) (0x0058 + 4 * (gen)) +#define DI_DW_SET(gen, set) (0x0088 + 4 * ((gen) + 0xc * (set))) +#define DI_SER_CONF 0x015c +#define DI_SSC 0x0160 +#define DI_POL 0x0164 +#define DI_AW0 0x0168 +#define DI_AW1 0x016c +#define DI_SCR_CONF 0x0170 +#define DI_STAT 0x0174 + +#define DI_SW_GEN0_RUN_COUNT(x) ((x) << 19) +#define DI_SW_GEN0_RUN_SRC(x) ((x) << 16) +#define DI_SW_GEN0_OFFSET_COUNT(x) ((x) << 3) +#define DI_SW_GEN0_OFFSET_SRC(x) ((x) << 0) + +#define DI_SW_GEN1_CNT_POL_GEN_EN(x) ((x) << 29) +#define DI_SW_GEN1_CNT_CLR_SRC(x) ((x) << 25) +#define DI_SW_GEN1_CNT_POL_TRIGGER_SRC(x) ((x) << 12) +#define DI_SW_GEN1_CNT_POL_CLR_SRC(x) ((x) << 9) +#define DI_SW_GEN1_CNT_DOWN(x) ((x) << 16) +#define DI_SW_GEN1_CNT_UP(x) (x) +#define DI_SW_GEN1_AUTO_RELOAD (0x10000000) + +#define DI_DW_GEN_ACCESS_SIZE_OFFSET 24 +#define DI_DW_GEN_COMPONENT_SIZE_OFFSET 16 + +#define DI_GEN_POLARITY_1 (1 << 0) +#define DI_GEN_POLARITY_2 (1 << 1) +#define DI_GEN_POLARITY_3 (1 << 2) +#define DI_GEN_POLARITY_4 (1 << 3) +#define DI_GEN_POLARITY_5 (1 << 4) +#define DI_GEN_POLARITY_6 (1 << 5) +#define DI_GEN_POLARITY_7 (1 << 6) +#define DI_GEN_POLARITY_8 (1 << 7) +#define DI_GEN_POLARITY_DISP_CLK (1 << 17) +#define DI_GEN_DI_CLK_EXT (1 << 20) +#define DI_GEN_DI_VSYNC_EXT (1 << 21) + +#define DI_POL_DRDY_DATA_POLARITY (1 << 7) +#define DI_POL_DRDY_POLARITY_15 (1 << 4) + +#define DI_VSYNC_SEL_OFFSET 13 + +static inline u32 ipu_di_read(struct ipu_di *di, unsigned offset) +{ + return readl(di->base + offset); +} + +static inline void ipu_di_write(struct ipu_di *di, u32 value, unsigned offset) +{ + writel(value, di->base + offset); +} + +static int ipu_di_clk_calc_div(unsigned long inrate, unsigned long outrate) +{ + u64 tmp = inrate; + int div; + + tmp *= 16; + + do_div(tmp, outrate); + + div = tmp; + + if (div < 0x10) + div = 0x10; + +#ifdef WTF_IS_THIS + /* + * Freescale has this in their Kernel. It is neither clear what + * it does nor why it does it + */ + if (div & 0x10) + div &= ~0x7; + else { + /* Round up divider if it gets us closer to desired pix clk */ + if ((div & 0xC) == 0xC) { + div += 0x10; + div &= ~0xF; + } + } +#endif + return div; +} + +static unsigned long clk_di_recalc_rate(struct clk_hw *hw, + unsigned long parent_rate) +{ + struct ipu_di *di = container_of(hw, struct ipu_di, clk_hw_out); + unsigned long outrate; + u32 div = ipu_di_read(di, DI_BS_CLKGEN0); + + if (div < 0x10) + div = 0x10; + + outrate = (parent_rate / div) * 16; + + return outrate; +} + +static long clk_di_round_rate(struct clk_hw *hw, unsigned long rate, + unsigned long *prate) +{ + struct ipu_di *di = container_of(hw, struct ipu_di, clk_hw_out); + unsigned long outrate; + int div; + u32 val; + + div = ipu_di_clk_calc_div(*prate, rate); + + outrate = (*prate / div) * 16; + + val = ipu_di_read(di, DI_GENERAL); + + if (!(val & DI_GEN_DI_CLK_EXT) && outrate > *prate / 2) + outrate = *prate / 2; + + dev_dbg(di->ipu->dev, + "%s: inrate: %ld div: 0x%08x outrate: %ld wanted: %ld\n", + __func__, *prate, div, outrate, rate); + + return outrate; +} + +static int clk_di_set_rate(struct clk_hw *hw, unsigned long rate, + unsigned long parent_rate) +{ + struct ipu_di *di = container_of(hw, struct ipu_di, clk_hw_out); + int div; + u32 clkgen0; + + clkgen0 = ipu_di_read(di, DI_BS_CLKGEN0) & ~0xfff; + + div = ipu_di_clk_calc_div(parent_rate, rate); + + ipu_di_write(di, clkgen0 | div, DI_BS_CLKGEN0); + + dev_dbg(di->ipu->dev, "%s: inrate: %ld desired: %ld div: 0x%08x\n", + __func__, parent_rate, rate, div); + return 0; +} + +static u8 clk_di_get_parent(struct clk_hw *hw) +{ + struct ipu_di *di = container_of(hw, struct ipu_di, clk_hw_out); + u32 val; + + val = ipu_di_read(di, DI_GENERAL); + + return val & DI_GEN_DI_CLK_EXT ? 1 : 0; +} + +static int clk_di_set_parent(struct clk_hw *hw, u8 index) +{ + struct ipu_di *di = container_of(hw, struct ipu_di, clk_hw_out); + u32 val; + + val = ipu_di_read(di, DI_GENERAL); + + if (index) + val |= DI_GEN_DI_CLK_EXT; + else + val &= ~DI_GEN_DI_CLK_EXT; + + ipu_di_write(di, val, DI_GENERAL); + + return 0; +} + +static struct clk_ops clk_di_ops = { + .round_rate = clk_di_round_rate, + .set_rate = clk_di_set_rate, + .recalc_rate = clk_di_recalc_rate, + .set_parent = clk_di_set_parent, + .get_parent = clk_di_get_parent, +}; + +static void ipu_di_data_wave_config(struct ipu_di *di, + int wave_gen, + int access_size, int component_size) +{ + u32 reg; + reg = (access_size << DI_DW_GEN_ACCESS_SIZE_OFFSET) | + (component_size << DI_DW_GEN_COMPONENT_SIZE_OFFSET); + ipu_di_write(di, reg, DI_DW_GEN(wave_gen)); +} + +static void ipu_di_data_pin_config(struct ipu_di *di, int wave_gen, int di_pin, + int set, int up, int down) +{ + u32 reg; + + reg = ipu_di_read(di, DI_DW_GEN(wave_gen)); + reg &= ~(0x3 << (di_pin * 2)); + reg |= set << (di_pin * 2); + ipu_di_write(di, reg, DI_DW_GEN(wave_gen)); + + ipu_di_write(di, (down << 16) | up, DI_DW_SET(wave_gen, set)); +} + +static void ipu_di_sync_config(struct ipu_di *di, struct di_sync_config *config, + int start, int count) +{ + u32 reg; + int i; + + for (i = 0; i < count; i++) { + struct di_sync_config *c = &config[i]; + int wave_gen = start + i + 1; + + if ((c->run_count >= 0x1000) || (c->offset_count >= 0x1000) || + (c->repeat_count >= 0x1000) || + (c->cnt_up >= 0x400) || + (c->cnt_down >= 0x400)) { + dev_err(di->ipu->dev, "DI%d counters out of range.\n", + di->id); + return; + } + + reg = DI_SW_GEN0_RUN_COUNT(c->run_count) | + DI_SW_GEN0_RUN_SRC(c->run_src) | + DI_SW_GEN0_OFFSET_COUNT(c->offset_count) | + DI_SW_GEN0_OFFSET_SRC(c->offset_src); + ipu_di_write(di, reg, DI_SW_GEN0(wave_gen)); + + reg = DI_SW_GEN1_CNT_POL_GEN_EN(c->cnt_polarity_gen_en) | + DI_SW_GEN1_CNT_CLR_SRC(c->cnt_clr_src) | + DI_SW_GEN1_CNT_POL_TRIGGER_SRC( + c->cnt_polarity_trigger_src) | + DI_SW_GEN1_CNT_POL_CLR_SRC(c->cnt_polarity_clr_src) | + DI_SW_GEN1_CNT_DOWN(c->cnt_down) | + DI_SW_GEN1_CNT_UP(c->cnt_up); + + /* Enable auto reload */ + if (c->repeat_count == 0) + reg |= DI_SW_GEN1_AUTO_RELOAD; + + ipu_di_write(di, reg, DI_SW_GEN1(wave_gen)); + + reg = ipu_di_read(di, DI_STP_REP(wave_gen)); + reg &= ~(0xffff << (16 * ((wave_gen - 1) & 0x1))); + reg |= c->repeat_count << (16 * ((wave_gen - 1) & 0x1)); + ipu_di_write(di, reg, DI_STP_REP(wave_gen)); + } +} + +static void ipu_di_sync_config_interlaced(struct ipu_di *di, + struct ipu_di_signal_cfg *sig) +{ + u32 h_total = sig->width + sig->h_sync_width + + sig->h_start_width + sig->h_end_width; + u32 v_total = sig->height + sig->v_sync_width + + sig->v_start_width + sig->v_end_width; + u32 reg; + struct di_sync_config cfg[] = { + { + .run_count = h_total / 2 - 1, + .run_src = DI_SYNC_CLK, + }, { + .run_count = h_total - 11, + .run_src = DI_SYNC_CLK, + .cnt_down = 4, + }, { + .run_count = v_total * 2 - 1, + .run_src = DI_SYNC_INT_HSYNC, + .offset_count = 1, + .offset_src = DI_SYNC_INT_HSYNC, + .cnt_down = 4, + }, { + .run_count = v_total / 2 - 1, + .run_src = DI_SYNC_HSYNC, + .offset_count = sig->v_start_width, + .offset_src = DI_SYNC_HSYNC, + .repeat_count = 2, + .cnt_clr_src = DI_SYNC_VSYNC, + }, { + .run_src = DI_SYNC_HSYNC, + .repeat_count = sig->height / 2, + .cnt_clr_src = 4, + }, { + .run_count = v_total - 1, + .run_src = DI_SYNC_HSYNC, + }, { + .run_count = v_total / 2 - 1, + .run_src = DI_SYNC_HSYNC, + .offset_count = 9, + .offset_src = DI_SYNC_HSYNC, + .repeat_count = 2, + .cnt_clr_src = DI_SYNC_VSYNC, + }, { + .run_src = DI_SYNC_CLK, + .offset_count = sig->h_start_width, + .offset_src = DI_SYNC_CLK, + .repeat_count = sig->width, + .cnt_clr_src = 5, + }, { + .run_count = v_total - 1, + .run_src = DI_SYNC_INT_HSYNC, + .offset_count = v_total / 2, + .offset_src = DI_SYNC_INT_HSYNC, + .cnt_clr_src = DI_SYNC_HSYNC, + .cnt_down = 4, + } + }; + + ipu_di_sync_config(di, cfg, 0, ARRAY_SIZE(cfg)); + + /* set gentime select and tag sel */ + reg = ipu_di_read(di, DI_SW_GEN1(9)); + reg &= 0x1FFFFFFF; + reg |= (3 - 1) << 29 | 0x00008000; + ipu_di_write(di, reg, DI_SW_GEN1(9)); + + ipu_di_write(di, v_total / 2 - 1, DI_SCR_CONF); +} + +static void ipu_di_sync_config_noninterlaced(struct ipu_di *di, + struct ipu_di_signal_cfg *sig, int div) +{ + u32 h_total = sig->width + sig->h_sync_width + sig->h_start_width + + sig->h_end_width; + u32 v_total = sig->height + sig->v_sync_width + sig->v_start_width + + sig->v_end_width; + struct di_sync_config cfg[] = { + { + .run_count = h_total - 1, + .run_src = DI_SYNC_CLK, + } , { + .run_count = h_total - 1, + .run_src = DI_SYNC_CLK, + .offset_count = div * sig->v_to_h_sync, + .offset_src = DI_SYNC_CLK, + .cnt_polarity_gen_en = 1, + .cnt_polarity_trigger_src = DI_SYNC_CLK, + .cnt_down = sig->h_sync_width * 2, + } , { + .run_count = v_total - 1, + .run_src = DI_SYNC_INT_HSYNC, + .cnt_polarity_gen_en = 1, + .cnt_polarity_trigger_src = DI_SYNC_INT_HSYNC, + .cnt_down = sig->v_sync_width * 2, + } , { + .run_src = DI_SYNC_HSYNC, + .offset_count = sig->v_sync_width + sig->v_start_width, + .offset_src = DI_SYNC_HSYNC, + .repeat_count = sig->height, + .cnt_clr_src = DI_SYNC_VSYNC, + } , { + .run_src = DI_SYNC_CLK, + .offset_count = sig->h_sync_width + sig->h_start_width, + .offset_src = DI_SYNC_CLK, + .repeat_count = sig->width, + .cnt_clr_src = 5, + } , { + /* unused */ + } , { + /* unused */ + } , { + /* unused */ + } , { + /* unused */ + }, + }; + + ipu_di_write(di, v_total - 1, DI_SCR_CONF); + ipu_di_sync_config(di, cfg, 0, ARRAY_SIZE(cfg)); +} + +int ipu_di_init_sync_panel(struct ipu_di *di, struct ipu_di_signal_cfg *sig) +{ + u32 reg; + u32 di_gen, vsync_cnt; + u32 div; + u32 h_total, v_total; + int ret; + unsigned long round; + struct clk *parent; + + dev_dbg(di->ipu->dev, "disp %d: panel size = %d x %d\n", + di->id, sig->width, sig->height); + + if ((sig->v_sync_width == 0) || (sig->h_sync_width == 0)) + return -EINVAL; + + if (sig->clkflags & IPU_DI_CLKMODE_EXT) + parent = di->clk_di; + else + parent = di->clk_ipu; + + ret = clk_set_parent(di->clk_di_pixel, parent); + if (ret) { + dev_err(di->ipu->dev, + "setting pixel clock to parent %s failed with %d\n", + __clk_get_name(parent), ret); + return ret; + } + + if (sig->clkflags & IPU_DI_CLKMODE_SYNC) + round = clk_get_rate(parent); + else + round = clk_round_rate(di->clk_di_pixel, sig->pixelclock); + + ret = clk_set_rate(di->clk_di_pixel, round); + + h_total = sig->width + sig->h_sync_width + sig->h_start_width + + sig->h_end_width; + v_total = sig->height + sig->v_sync_width + sig->v_start_width + + sig->v_end_width; + + mutex_lock(&di_mutex); + + div = ipu_di_read(di, DI_BS_CLKGEN0) & 0xfff; + div = div / 16; /* Now divider is integer portion */ + + /* Setup pixel clock timing */ + /* Down time is half of period */ + ipu_di_write(di, (div << 16), DI_BS_CLKGEN1); + + ipu_di_data_wave_config(di, SYNC_WAVE, div - 1, div - 1); + ipu_di_data_pin_config(di, SYNC_WAVE, DI_PIN15, 3, 0, div * 2); + + di_gen = ipu_di_read(di, DI_GENERAL) & DI_GEN_DI_CLK_EXT; + di_gen |= DI_GEN_DI_VSYNC_EXT; + + if (sig->interlaced) { + ipu_di_sync_config_interlaced(di, sig); + + /* set y_sel = 1 */ + di_gen |= 0x10000000; + di_gen |= DI_GEN_POLARITY_5; + di_gen |= DI_GEN_POLARITY_8; + + vsync_cnt = 7; + + if (sig->Hsync_pol) + di_gen |= DI_GEN_POLARITY_3; + if (sig->Vsync_pol) + di_gen |= DI_GEN_POLARITY_2; + } else { + ipu_di_sync_config_noninterlaced(di, sig, div); + + vsync_cnt = 3; + + if (sig->Hsync_pol) + di_gen |= DI_GEN_POLARITY_2; + if (sig->Vsync_pol) + di_gen |= DI_GEN_POLARITY_3; + } + + if (!sig->clk_pol) + di_gen |= DI_GEN_POLARITY_DISP_CLK; + + ipu_di_write(di, di_gen, DI_GENERAL); + + ipu_di_write(di, (--vsync_cnt << DI_VSYNC_SEL_OFFSET) | 0x00000002, + DI_SYNC_AS_GEN); + + reg = ipu_di_read(di, DI_POL); + reg &= ~(DI_POL_DRDY_DATA_POLARITY | DI_POL_DRDY_POLARITY_15); + + if (sig->enable_pol) + reg |= DI_POL_DRDY_POLARITY_15; + if (sig->data_pol) + reg |= DI_POL_DRDY_DATA_POLARITY; + + ipu_di_write(di, reg, DI_POL); + + mutex_unlock(&di_mutex); + + return 0; +} +EXPORT_SYMBOL_GPL(ipu_di_init_sync_panel); + +int ipu_di_enable(struct ipu_di *di) +{ + clk_prepare_enable(di->clk_di_pixel); + + ipu_module_enable(di->ipu, di->module); + + return 0; +} +EXPORT_SYMBOL_GPL(ipu_di_enable); + +int ipu_di_disable(struct ipu_di *di) +{ + ipu_module_disable(di->ipu, di->module); + + clk_disable_unprepare(di->clk_di_pixel); + + return 0; +} +EXPORT_SYMBOL_GPL(ipu_di_disable); + +int ipu_di_get_num(struct ipu_di *di) +{ + return di->id; +} +EXPORT_SYMBOL_GPL(ipu_di_get_num); + +static DEFINE_MUTEX(ipu_di_lock); + +struct ipu_di *ipu_di_get(struct ipu_soc *ipu, int disp) +{ + struct ipu_di *di; + + if (disp > 1) + return ERR_PTR(-EINVAL); + + di = ipu->di_priv[disp]; + + mutex_lock(&ipu_di_lock); + + if (di->inuse) { + di = ERR_PTR(-EBUSY); + goto out; + } + + di->inuse = true; +out: + mutex_unlock(&ipu_di_lock); + + return di; +} +EXPORT_SYMBOL_GPL(ipu_di_get); + +void ipu_di_put(struct ipu_di *di) +{ + mutex_lock(&ipu_di_lock); + + di->inuse = false; + + mutex_unlock(&ipu_di_lock); +} +EXPORT_SYMBOL_GPL(ipu_di_put); + +int ipu_di_init(struct ipu_soc *ipu, struct device *dev, int id, + unsigned long base, + u32 module, struct clk *clk_ipu) +{ + struct ipu_di *di; + int ret; + const char *di_parent[2]; + struct clk_init_data init = { + .ops = &clk_di_ops, + .num_parents = 2, + .flags = 0, + }; + + if (id > 1) + return -ENODEV; + + di = devm_kzalloc(dev, sizeof(*di), GFP_KERNEL); + if (!di) + return -ENOMEM; + + ipu->di_priv[id] = di; + + di->clk_di = devm_clk_get(dev, id ? "di1" : "di0"); + if (IS_ERR(di->clk_di)) + return PTR_ERR(di->clk_di); + + di->module = module; + di->id = id; + di->clk_ipu = clk_ipu; + di->base = devm_ioremap(dev, base, PAGE_SIZE); + if (!di->base) + return -ENOMEM; + + di_parent[0] = __clk_get_name(di->clk_ipu); + di_parent[1] = __clk_get_name(di->clk_di); + + ipu_di_write(di, 0x10, DI_BS_CLKGEN0); + + init.parent_names = (const char **)&di_parent; + di->clk_name = kasprintf(GFP_KERNEL, "%s_di%d_pixel", + dev_name(dev), id); + if (!di->clk_name) + return -ENOMEM; + + init.name = di->clk_name; + + di->clk_hw_out.init = &init; + di->clk_di_pixel = clk_register(dev, &di->clk_hw_out); + + if (IS_ERR(di->clk_di_pixel)) { + ret = PTR_ERR(di->clk_di_pixel); + goto failed_clk_register; + } + + dev_info(dev, "DI%d base: 0x%08lx remapped to %p\n", + id, base, di->base); + di->inuse = false; + di->ipu = ipu; + + return 0; + +failed_clk_register: + + kfree(di->clk_name); + + return ret; +} + +void ipu_di_exit(struct ipu_soc *ipu, int id) +{ + struct ipu_di *di = ipu->di_priv[id]; + + clk_unregister(di->clk_di_pixel); + kfree(di->clk_name); +} |