diff options
Diffstat (limited to 'arch/arm/mach-tegra/tegra2_emc.c')
| -rw-r--r-- | arch/arm/mach-tegra/tegra2_emc.c | 178 |
1 files changed, 0 insertions, 178 deletions
diff --git a/arch/arm/mach-tegra/tegra2_emc.c b/arch/arm/mach-tegra/tegra2_emc.c deleted file mode 100644 index 0f7ae6e90b5..00000000000 --- a/arch/arm/mach-tegra/tegra2_emc.c +++ /dev/null @@ -1,178 +0,0 @@ -/* - * Copyright (C) 2011 Google, Inc. - * - * Author: - * Colin Cross <ccross@android.com> - * - * This software is licensed under the terms of the GNU General Public - * License version 2, as published by the Free Software Foundation, and - * may be copied, distributed, and modified under those terms. - * - * 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/kernel.h> -#include <linux/clk.h> -#include <linux/err.h> -#include <linux/io.h> -#include <linux/module.h> - -#include <mach/iomap.h> - -#include "tegra2_emc.h" - -#ifdef CONFIG_TEGRA_EMC_SCALING_ENABLE -static bool emc_enable = true; -#else -static bool emc_enable; -#endif -module_param(emc_enable, bool, 0644); - -static void __iomem *emc = IO_ADDRESS(TEGRA_EMC_BASE); -static const struct tegra_emc_table *tegra_emc_table; -static int tegra_emc_table_size; - -static inline void emc_writel(u32 val, unsigned long addr) -{ - writel(val, emc + addr); -} - -static inline u32 emc_readl(unsigned long addr) -{ - return readl(emc + addr); -} - -static const unsigned long emc_reg_addr[TEGRA_EMC_NUM_REGS] = { - 0x2c, /* RC */ - 0x30, /* RFC */ - 0x34, /* RAS */ - 0x38, /* RP */ - 0x3c, /* R2W */ - 0x40, /* W2R */ - 0x44, /* R2P */ - 0x48, /* W2P */ - 0x4c, /* RD_RCD */ - 0x50, /* WR_RCD */ - 0x54, /* RRD */ - 0x58, /* REXT */ - 0x5c, /* WDV */ - 0x60, /* QUSE */ - 0x64, /* QRST */ - 0x68, /* QSAFE */ - 0x6c, /* RDV */ - 0x70, /* REFRESH */ - 0x74, /* BURST_REFRESH_NUM */ - 0x78, /* PDEX2WR */ - 0x7c, /* PDEX2RD */ - 0x80, /* PCHG2PDEN */ - 0x84, /* ACT2PDEN */ - 0x88, /* AR2PDEN */ - 0x8c, /* RW2PDEN */ - 0x90, /* TXSR */ - 0x94, /* TCKE */ - 0x98, /* TFAW */ - 0x9c, /* TRPAB */ - 0xa0, /* TCLKSTABLE */ - 0xa4, /* TCLKSTOP */ - 0xa8, /* TREFBW */ - 0xac, /* QUSE_EXTRA */ - 0x114, /* FBIO_CFG6 */ - 0xb0, /* ODT_WRITE */ - 0xb4, /* ODT_READ */ - 0x104, /* FBIO_CFG5 */ - 0x2bc, /* CFG_DIG_DLL */ - 0x2c0, /* DLL_XFORM_DQS */ - 0x2c4, /* DLL_XFORM_QUSE */ - 0x2e0, /* ZCAL_REF_CNT */ - 0x2e4, /* ZCAL_WAIT_CNT */ - 0x2a8, /* AUTO_CAL_INTERVAL */ - 0x2d0, /* CFG_CLKTRIM_0 */ - 0x2d4, /* CFG_CLKTRIM_1 */ - 0x2d8, /* CFG_CLKTRIM_2 */ -}; - -/* Select the closest EMC rate that is higher than the requested rate */ -long tegra_emc_round_rate(unsigned long rate) -{ - int i; - int best = -1; - unsigned long distance = ULONG_MAX; - - if (!tegra_emc_table) - return -EINVAL; - - if (!emc_enable) - return -EINVAL; - - pr_debug("%s: %lu\n", __func__, rate); - - /* - * The EMC clock rate is twice the bus rate, and the bus rate is - * measured in kHz - */ - rate = rate / 2 / 1000; - - for (i = 0; i < tegra_emc_table_size; i++) { - if (tegra_emc_table[i].rate >= rate && - (tegra_emc_table[i].rate - rate) < distance) { - distance = tegra_emc_table[i].rate - rate; - best = i; - } - } - - if (best < 0) - return -EINVAL; - - pr_debug("%s: using %lu\n", __func__, tegra_emc_table[best].rate); - - return tegra_emc_table[best].rate * 2 * 1000; -} - -/* - * The EMC registers have shadow registers. When the EMC clock is updated - * in the clock controller, the shadow registers are copied to the active - * registers, allowing glitchless memory bus frequency changes. - * This function updates the shadow registers for a new clock frequency, - * and relies on the clock lock on the emc clock to avoid races between - * multiple frequency changes - */ -int tegra_emc_set_rate(unsigned long rate) -{ - int i; - int j; - - if (!tegra_emc_table) - return -EINVAL; - - /* - * The EMC clock rate is twice the bus rate, and the bus rate is - * measured in kHz - */ - rate = rate / 2 / 1000; - - for (i = 0; i < tegra_emc_table_size; i++) - if (tegra_emc_table[i].rate == rate) - break; - - if (i >= tegra_emc_table_size) - return -EINVAL; - - pr_debug("%s: setting to %lu\n", __func__, rate); - - for (j = 0; j < TEGRA_EMC_NUM_REGS; j++) - emc_writel(tegra_emc_table[i].regs[j], emc_reg_addr[j]); - - emc_readl(tegra_emc_table[i].regs[TEGRA_EMC_NUM_REGS - 1]); - - return 0; -} - -void tegra_init_emc(const struct tegra_emc_table *table, int table_size) -{ - tegra_emc_table = table; - tegra_emc_table_size = table_size; -} |