diff options
Diffstat (limited to 'drivers/video/fbdev/omap2/dss/pll.c')
| -rw-r--r-- | drivers/video/fbdev/omap2/dss/pll.c | 389 |
1 files changed, 0 insertions, 389 deletions
diff --git a/drivers/video/fbdev/omap2/dss/pll.c b/drivers/video/fbdev/omap2/dss/pll.c deleted file mode 100644 index f974ddcd3b6e..000000000000 --- a/drivers/video/fbdev/omap2/dss/pll.c +++ /dev/null @@ -1,389 +0,0 @@ -/* - * Copyright (C) 2014 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. - * - * 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. - * - * You should have received a copy of the GNU General Public License along with - * this program. If not, see <http://www.gnu.org/licenses/>. - */ - -#define DSS_SUBSYS_NAME "PLL" - -#include <linux/clk.h> -#include <linux/io.h> -#include <linux/kernel.h> -#include <linux/regulator/consumer.h> -#include <linux/sched.h> - -#include <video/omapdss.h> - -#include "dss.h" - -#define PLL_CONTROL 0x0000 -#define PLL_STATUS 0x0004 -#define PLL_GO 0x0008 -#define PLL_CONFIGURATION1 0x000C -#define PLL_CONFIGURATION2 0x0010 -#define PLL_CONFIGURATION3 0x0014 -#define PLL_SSC_CONFIGURATION1 0x0018 -#define PLL_SSC_CONFIGURATION2 0x001C -#define PLL_CONFIGURATION4 0x0020 - -static struct dss_pll *dss_plls[4]; - -int dss_pll_register(struct dss_pll *pll) -{ - int i; - - for (i = 0; i < ARRAY_SIZE(dss_plls); ++i) { - if (!dss_plls[i]) { - dss_plls[i] = pll; - return 0; - } - } - - return -EBUSY; -} - -void dss_pll_unregister(struct dss_pll *pll) -{ - int i; - - for (i = 0; i < ARRAY_SIZE(dss_plls); ++i) { - if (dss_plls[i] == pll) { - dss_plls[i] = NULL; - return; - } - } -} - -struct dss_pll *dss_pll_find(const char *name) -{ - int i; - - for (i = 0; i < ARRAY_SIZE(dss_plls); ++i) { - if (dss_plls[i] && strcmp(dss_plls[i]->name, name) == 0) - return dss_plls[i]; - } - - return NULL; -} - -int dss_pll_enable(struct dss_pll *pll) -{ - int r; - - r = clk_prepare_enable(pll->clkin); - if (r) - return r; - - if (pll->regulator) { - r = regulator_enable(pll->regulator); - if (r) - goto err_reg; - } - - r = pll->ops->enable(pll); - if (r) - goto err_enable; - - return 0; - -err_enable: - if (pll->regulator) - regulator_disable(pll->regulator); -err_reg: - clk_disable_unprepare(pll->clkin); - return r; -} - -void dss_pll_disable(struct dss_pll *pll) -{ - pll->ops->disable(pll); - - if (pll->regulator) - regulator_disable(pll->regulator); - - clk_disable_unprepare(pll->clkin); - - memset(&pll->cinfo, 0, sizeof(pll->cinfo)); -} - -int dss_pll_set_config(struct dss_pll *pll, const struct dss_pll_clock_info *cinfo) -{ - int r; - - r = pll->ops->set_config(pll, cinfo); - if (r) - return r; - - pll->cinfo = *cinfo; - - return 0; -} - -bool dss_pll_hsdiv_calc(const struct dss_pll *pll, unsigned long clkdco, - unsigned long out_min, unsigned long out_max, - dss_hsdiv_calc_func func, void *data) -{ - const struct dss_pll_hw *hw = pll->hw; - int m, m_start, m_stop; - unsigned long out; - - out_min = out_min ? out_min : 1; - out_max = out_max ? out_max : ULONG_MAX; - - m_start = max(DIV_ROUND_UP(clkdco, out_max), 1ul); - - m_stop = min((unsigned)(clkdco / out_min), hw->mX_max); - - for (m = m_start; m <= m_stop; ++m) { - out = clkdco / m; - - if (func(m, out, data)) - return true; - } - - return false; -} - -bool dss_pll_calc(const struct dss_pll *pll, unsigned long clkin, - unsigned long pll_min, unsigned long pll_max, - dss_pll_calc_func func, void *data) -{ - const struct dss_pll_hw *hw = pll->hw; - int n, n_start, n_stop; - int m, m_start, m_stop; - unsigned long fint, clkdco; - unsigned long pll_hw_max; - unsigned long fint_hw_min, fint_hw_max; - - pll_hw_max = hw->clkdco_max; - - fint_hw_min = hw->fint_min; - fint_hw_max = hw->fint_max; - - n_start = max(DIV_ROUND_UP(clkin, fint_hw_max), 1ul); - n_stop = min((unsigned)(clkin / fint_hw_min), hw->n_max); - - pll_max = pll_max ? pll_max : ULONG_MAX; - - for (n = n_start; n <= n_stop; ++n) { - fint = clkin / n; - - m_start = max(DIV_ROUND_UP(DIV_ROUND_UP(pll_min, fint), 2), - 1ul); - m_stop = min3((unsigned)(pll_max / fint / 2), - (unsigned)(pll_hw_max / fint / 2), - hw->m_max); - - for (m = m_start; m <= m_stop; ++m) { - clkdco = 2 * m * fint; - - if (func(n, m, fint, clkdco, data)) - return true; - } - } - - return false; -} - -static int wait_for_bit_change(void __iomem *reg, int bitnum, int value) -{ - unsigned long timeout; - ktime_t wait; - int t; - - /* first busyloop to see if the bit changes right away */ - t = 100; - while (t-- > 0) { - if (FLD_GET(readl_relaxed(reg), bitnum, bitnum) == value) - return value; - } - - /* then loop for 500ms, sleeping for 1ms in between */ - timeout = jiffies + msecs_to_jiffies(500); - while (time_before(jiffies, timeout)) { - if (FLD_GET(readl_relaxed(reg), bitnum, bitnum) == value) - return value; - - wait = ns_to_ktime(1000 * 1000); - set_current_state(TASK_UNINTERRUPTIBLE); - schedule_hrtimeout(&wait, HRTIMER_MODE_REL); - } - - return !value; -} - -int dss_pll_wait_reset_done(struct dss_pll *pll) -{ - void __iomem *base = pll->base; - - if (wait_for_bit_change(base + PLL_STATUS, 0, 1) != 1) - return -ETIMEDOUT; - else - return 0; -} - -static int dss_wait_hsdiv_ack(struct dss_pll *pll, u32 hsdiv_ack_mask) -{ - int t = 100; - - while (t-- > 0) { - u32 v = readl_relaxed(pll->base + PLL_STATUS); - v &= hsdiv_ack_mask; - if (v == hsdiv_ack_mask) - return 0; - } - - return -ETIMEDOUT; -} - -int dss_pll_write_config_type_a(struct dss_pll *pll, - const struct dss_pll_clock_info *cinfo) -{ - const struct dss_pll_hw *hw = pll->hw; - void __iomem *base = pll->base; - int r = 0; - u32 l; - - l = 0; - if (hw->has_stopmode) - l = FLD_MOD(l, 1, 0, 0); /* PLL_STOPMODE */ - l = FLD_MOD(l, cinfo->n - 1, hw->n_msb, hw->n_lsb); /* PLL_REGN */ - l = FLD_MOD(l, cinfo->m, hw->m_msb, hw->m_lsb); /* PLL_REGM */ - /* M4 */ - l = FLD_MOD(l, cinfo->mX[0] ? cinfo->mX[0] - 1 : 0, - hw->mX_msb[0], hw->mX_lsb[0]); - /* M5 */ - l = FLD_MOD(l, cinfo->mX[1] ? cinfo->mX[1] - 1 : 0, - hw->mX_msb[1], hw->mX_lsb[1]); - writel_relaxed(l, base + PLL_CONFIGURATION1); - - l = 0; - /* M6 */ - l = FLD_MOD(l, cinfo->mX[2] ? cinfo->mX[2] - 1 : 0, - hw->mX_msb[2], hw->mX_lsb[2]); - /* M7 */ - l = FLD_MOD(l, cinfo->mX[3] ? cinfo->mX[3] - 1 : 0, - hw->mX_msb[3], hw->mX_lsb[3]); - writel_relaxed(l, base + PLL_CONFIGURATION3); - - l = readl_relaxed(base + PLL_CONFIGURATION2); - if (hw->has_freqsel) { - u32 f = cinfo->fint < 1000000 ? 0x3 : - cinfo->fint < 1250000 ? 0x4 : - cinfo->fint < 1500000 ? 0x5 : - cinfo->fint < 1750000 ? 0x6 : - 0x7; - - l = FLD_MOD(l, f, 4, 1); /* PLL_FREQSEL */ - } else if (hw->has_selfreqdco) { - u32 f = cinfo->clkdco < hw->clkdco_low ? 0x2 : 0x4; - - l = FLD_MOD(l, f, 3, 1); /* PLL_SELFREQDCO */ - } - l = FLD_MOD(l, 1, 13, 13); /* PLL_REFEN */ - l = FLD_MOD(l, 0, 14, 14); /* PHY_CLKINEN */ - l = FLD_MOD(l, 0, 16, 16); /* M4_CLOCK_EN */ - l = FLD_MOD(l, 0, 18, 18); /* M5_CLOCK_EN */ - l = FLD_MOD(l, 1, 20, 20); /* HSDIVBYPASS */ - if (hw->has_refsel) - l = FLD_MOD(l, 3, 22, 21); /* REFSEL = sysclk */ - l = FLD_MOD(l, 0, 23, 23); /* M6_CLOCK_EN */ - l = FLD_MOD(l, 0, 25, 25); /* M7_CLOCK_EN */ - writel_relaxed(l, base + PLL_CONFIGURATION2); - - writel_relaxed(1, base + PLL_GO); /* PLL_GO */ - - if (wait_for_bit_change(base + PLL_GO, 0, 0) != 0) { - DSSERR("DSS DPLL GO bit not going down.\n"); - r = -EIO; - goto err; - } - - if (wait_for_bit_change(base + PLL_STATUS, 1, 1) != 1) { - DSSERR("cannot lock DSS DPLL\n"); - r = -EIO; - goto err; - } - - l = readl_relaxed(base + PLL_CONFIGURATION2); - l = FLD_MOD(l, 1, 14, 14); /* PHY_CLKINEN */ - l = FLD_MOD(l, cinfo->mX[0] ? 1 : 0, 16, 16); /* M4_CLOCK_EN */ - l = FLD_MOD(l, cinfo->mX[1] ? 1 : 0, 18, 18); /* M5_CLOCK_EN */ - l = FLD_MOD(l, 0, 20, 20); /* HSDIVBYPASS */ - l = FLD_MOD(l, cinfo->mX[2] ? 1 : 0, 23, 23); /* M6_CLOCK_EN */ - l = FLD_MOD(l, cinfo->mX[3] ? 1 : 0, 25, 25); /* M7_CLOCK_EN */ - writel_relaxed(l, base + PLL_CONFIGURATION2); - - r = dss_wait_hsdiv_ack(pll, - (cinfo->mX[0] ? BIT(7) : 0) | - (cinfo->mX[1] ? BIT(8) : 0) | - (cinfo->mX[2] ? BIT(10) : 0) | - (cinfo->mX[3] ? BIT(11) : 0)); - if (r) { - DSSERR("failed to enable HSDIV clocks\n"); - goto err; - } - -err: - return r; -} - -int dss_pll_write_config_type_b(struct dss_pll *pll, - const struct dss_pll_clock_info *cinfo) -{ - const struct dss_pll_hw *hw = pll->hw; - void __iomem *base = pll->base; - u32 l; - - l = 0; - l = FLD_MOD(l, cinfo->m, 20, 9); /* PLL_REGM */ - l = FLD_MOD(l, cinfo->n - 1, 8, 1); /* PLL_REGN */ - writel_relaxed(l, base + PLL_CONFIGURATION1); - - l = readl_relaxed(base + PLL_CONFIGURATION2); - l = FLD_MOD(l, 0x0, 12, 12); /* PLL_HIGHFREQ divide by 2 */ - l = FLD_MOD(l, 0x1, 13, 13); /* PLL_REFEN */ - l = FLD_MOD(l, 0x0, 14, 14); /* PHY_CLKINEN */ - if (hw->has_refsel) - l = FLD_MOD(l, 0x3, 22, 21); /* REFSEL = SYSCLK */ - - /* PLL_SELFREQDCO */ - if (cinfo->clkdco > hw->clkdco_low) - l = FLD_MOD(l, 0x4, 3, 1); - else - l = FLD_MOD(l, 0x2, 3, 1); - writel_relaxed(l, base + PLL_CONFIGURATION2); - - l = readl_relaxed(base + PLL_CONFIGURATION3); - l = FLD_MOD(l, cinfo->sd, 17, 10); /* PLL_REGSD */ - writel_relaxed(l, base + PLL_CONFIGURATION3); - - l = readl_relaxed(base + PLL_CONFIGURATION4); - l = FLD_MOD(l, cinfo->mX[0], 24, 18); /* PLL_REGM2 */ - l = FLD_MOD(l, cinfo->mf, 17, 0); /* PLL_REGM_F */ - writel_relaxed(l, base + PLL_CONFIGURATION4); - - writel_relaxed(1, base + PLL_GO); /* PLL_GO */ - - if (wait_for_bit_change(base + PLL_GO, 0, 0) != 0) { - DSSERR("DSS DPLL GO bit not going down.\n"); - return -EIO; - } - - if (wait_for_bit_change(base + PLL_STATUS, 1, 1) != 1) { - DSSERR("cannot lock DSS DPLL\n"); - return -ETIMEDOUT; - } - - return 0; -} |