diff options
Diffstat (limited to 'drivers/video/omap2/dss/hdmi_pll.c')
| -rw-r--r-- | drivers/video/omap2/dss/hdmi_pll.c | 230 |
1 files changed, 230 insertions, 0 deletions
diff --git a/drivers/video/omap2/dss/hdmi_pll.c b/drivers/video/omap2/dss/hdmi_pll.c new file mode 100644 index 0000000..d3e6e78 --- /dev/null +++ b/drivers/video/omap2/dss/hdmi_pll.c @@ -0,0 +1,230 @@ +/* + * HDMI PLL + * + * Copyright (C) 2013 Texas Instruments Incorporated + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 as published by + * the Free Software Foundation. + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/err.h> +#include <linux/io.h> +#include <linux/platform_device.h> +#include <video/omapdss.h> + +#include "dss.h" +#include "hdmi.h" + +#define HDMI_DEFAULT_REGN 16 +#define HDMI_DEFAULT_REGM2 1 + +void hdmi_pll_dump(struct hdmi_pll_data *pll, struct seq_file *s) +{ +#define DUMPPLL(r) seq_printf(s, "%-35s %08x\n", #r,\ + hdmi_read_reg(pll->base, r)) + + DUMPPLL(PLLCTRL_PLL_CONTROL); + DUMPPLL(PLLCTRL_PLL_STATUS); + DUMPPLL(PLLCTRL_PLL_GO); + DUMPPLL(PLLCTRL_CFG1); + DUMPPLL(PLLCTRL_CFG2); + DUMPPLL(PLLCTRL_CFG3); + DUMPPLL(PLLCTRL_SSC_CFG1); + DUMPPLL(PLLCTRL_SSC_CFG2); + DUMPPLL(PLLCTRL_CFG4); +} + +void hdmi_pll_compute(struct hdmi_pll_data *pll, unsigned long clkin, int phy) +{ + struct hdmi_pll_info *pi = &pll->info; + unsigned long refclk; + u32 mf; + + /* use our funky units */ + clkin /= 10000; + + /* + * Input clock is predivided by N + 1 + * out put of which is reference clk + */ + + pi->regn = HDMI_DEFAULT_REGN; + + refclk = clkin / pi->regn; + + pi->regm2 = HDMI_DEFAULT_REGM2; + + /* + * multiplier is pixel_clk/ref_clk + * Multiplying by 100 to avoid fractional part removal + */ + pi->regm = phy * pi->regm2 / refclk; + + /* + * fractional multiplier is remainder of the difference between + * multiplier and actual phy(required pixel clock thus should be + * multiplied by 2^18(262144) divided by the reference clock + */ + mf = (phy - pi->regm / pi->regm2 * refclk) * 262144; + pi->regmf = pi->regm2 * mf / refclk; + + /* + * Dcofreq should be set to 1 if required pixel clock + * is greater than 1000MHz + */ + pi->dcofreq = phy > 1000 * 100; + pi->regsd = ((pi->regm * clkin / 10) / (pi->regn * 250) + 5) / 10; + + /* Set the reference clock to sysclk reference */ + pi->refsel = HDMI_REFSEL_SYSCLK; + + DSSDBG("M = %d Mf = %d\n", pi->regm, pi->regmf); + DSSDBG("range = %d sd = %d\n", pi->dcofreq, pi->regsd); +} + + +static int hdmi_pll_config(struct hdmi_pll_data *pll) +{ + u32 r; + struct hdmi_pll_info *fmt = &pll->info; + + /* PLL start always use manual mode */ + REG_FLD_MOD(pll->base, PLLCTRL_PLL_CONTROL, 0x0, 0, 0); + + r = hdmi_read_reg(pll->base, PLLCTRL_CFG1); + r = FLD_MOD(r, fmt->regm, 20, 9); /* CFG1_PLL_REGM */ + r = FLD_MOD(r, fmt->regn - 1, 8, 1); /* CFG1_PLL_REGN */ + hdmi_write_reg(pll->base, PLLCTRL_CFG1, r); + + r = hdmi_read_reg(pll->base, PLLCTRL_CFG2); + + r = FLD_MOD(r, 0x0, 12, 12); /* PLL_HIGHFREQ divide by 2 */ + r = FLD_MOD(r, 0x1, 13, 13); /* PLL_REFEN */ + r = FLD_MOD(r, 0x0, 14, 14); /* PHY_CLKINEN de-assert during locking */ + r = FLD_MOD(r, fmt->refsel, 22, 21); /* REFSEL */ + + if (fmt->dcofreq) { + /* divider programming for frequency beyond 1000Mhz */ + REG_FLD_MOD(pll->base, PLLCTRL_CFG3, fmt->regsd, 17, 10); + r = FLD_MOD(r, 0x4, 3, 1); /* 1000MHz and 2000MHz */ + } else { + r = FLD_MOD(r, 0x2, 3, 1); /* 500MHz and 1000MHz */ + } + + hdmi_write_reg(pll->base, PLLCTRL_CFG2, r); + + r = hdmi_read_reg(pll->base, PLLCTRL_CFG4); + r = FLD_MOD(r, fmt->regm2, 24, 18); + r = FLD_MOD(r, fmt->regmf, 17, 0); + hdmi_write_reg(pll->base, PLLCTRL_CFG4, r); + + /* go now */ + REG_FLD_MOD(pll->base, PLLCTRL_PLL_GO, 0x1, 0, 0); + + /* wait for bit change */ + if (hdmi_wait_for_bit_change(pll->base, PLLCTRL_PLL_GO, + 0, 0, 1) != 1) { + pr_err("PLL GO bit not set\n"); + return -ETIMEDOUT; + } + + /* Wait till the lock bit is set in PLL status */ + if (hdmi_wait_for_bit_change(pll->base, + PLLCTRL_PLL_STATUS, 1, 1, 1) != 1) { + pr_err("cannot lock PLL\n"); + pr_err("CFG1 0x%x\n", + hdmi_read_reg(pll->base, PLLCTRL_CFG1)); + pr_err("CFG2 0x%x\n", + hdmi_read_reg(pll->base, PLLCTRL_CFG2)); + pr_err("CFG4 0x%x\n", + hdmi_read_reg(pll->base, PLLCTRL_CFG4)); + return -ETIMEDOUT; + } + + pr_debug("PLL locked!\n"); + + return 0; +} + +static int hdmi_pll_reset(struct hdmi_pll_data *pll) +{ + /* SYSRESET controlled by power FSM */ + REG_FLD_MOD(pll->base, PLLCTRL_PLL_CONTROL, 0x0, 3, 3); + + /* READ 0x0 reset is in progress */ + if (hdmi_wait_for_bit_change(pll->base, PLLCTRL_PLL_STATUS, 0, 0, 1) + != 1) { + pr_err("Failed to sysreset PLL\n"); + return -ETIMEDOUT; + } + + return 0; +} + +int hdmi_pll_enable(struct hdmi_pll_data *pll, struct hdmi_wp_data *wp) +{ + u16 r = 0; + + r = hdmi_wp_set_pll_pwr(wp, HDMI_PLLPWRCMD_ALLOFF); + if (r) + return r; + + r = hdmi_wp_set_pll_pwr(wp, HDMI_PLLPWRCMD_BOTHON_ALLCLKS); + if (r) + return r; + + r = hdmi_pll_reset(pll); + if (r) + return r; + + r = hdmi_pll_config(pll); + if (r) + return r; + + return 0; +} + +void hdmi_pll_disable(struct hdmi_pll_data *pll, struct hdmi_wp_data *wp) +{ + hdmi_wp_set_pll_pwr(wp, HDMI_PLLPWRCMD_ALLOFF); +} + +#define PLL_OFFSET 0x200 +#define PLL_SIZE 0x100 + +int hdmi_pll_init(struct platform_device *pdev, struct hdmi_pll_data *pll) +{ + struct resource *res; + struct resource temp_res; + + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "hdmi_pllctrl"); + if (!res) { + DSSDBG("can't get PLL mem resource by name\n"); + /* + * if hwmod/DT doesn't have the memory resource information + * split into HDMI sub blocks by name, we try again by getting + * the platform's first resource. this code will be removed when + * the driver can get the mem resources by name + */ + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) { + DSSERR("can't get PLL mem resource\n"); + return -EINVAL; + } + + temp_res.start = res->start + PLL_OFFSET; + temp_res.end = temp_res.start + PLL_SIZE - 1; + res = &temp_res; + } + + pll->base = devm_ioremap(&pdev->dev, res->start, resource_size(res)); + if (!pll->base) { + DSSERR("can't ioremap PLLCTRL\n"); + return -ENOMEM; + } + + return 0; +} |
