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ARM: tegra: remove tegra EMC scaling driver
Nothing calls into the Tegra EMC (External Memory Controller) scaling driver any more, so it's dead code. Remove it. Cc: Joseph Lo <josephl@nvidia.com> Signed-off-by: Stephen Warren <swarren@nvidia.com>
This commit is contained in:
Stephen Warren
parent
5f80993241
commit
a7cbe92cef
@ -14,7 +14,6 @@ obj-y += sleep.o
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obj-y += tegra.o
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obj-$(CONFIG_CPU_IDLE) += cpuidle.o
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obj-$(CONFIG_ARCH_TEGRA_2x_SOC) += tegra20_speedo.o
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obj-$(CONFIG_ARCH_TEGRA_2x_SOC) += tegra2_emc.o
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obj-$(CONFIG_ARCH_TEGRA_2x_SOC) += sleep-tegra20.o
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obj-$(CONFIG_ARCH_TEGRA_2x_SOC) += pm-tegra20.o
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ifeq ($(CONFIG_CPU_IDLE),y)
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@ -1,347 +0,0 @@
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/*
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* Copyright (C) 2011 Google, Inc.
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*
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* Author:
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* Colin Cross <ccross@android.com>
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/device.h>
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#include <linux/clk.h>
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#include <linux/err.h>
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#include <linux/io.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/platform_data/tegra_emc.h>
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#include "tegra2_emc.h"
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#include "fuse.h"
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#ifdef CONFIG_TEGRA_EMC_SCALING_ENABLE
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static bool emc_enable = true;
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#else
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static bool emc_enable;
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#endif
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module_param(emc_enable, bool, 0644);
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static struct platform_device *emc_pdev;
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static void __iomem *emc_regbase;
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static inline void emc_writel(u32 val, unsigned long addr)
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{
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writel(val, emc_regbase + addr);
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}
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static inline u32 emc_readl(unsigned long addr)
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{
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return readl(emc_regbase + addr);
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}
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static const unsigned long emc_reg_addr[TEGRA_EMC_NUM_REGS] = {
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0x2c, /* RC */
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0x30, /* RFC */
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0x34, /* RAS */
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0x38, /* RP */
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0x3c, /* R2W */
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0x40, /* W2R */
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0x44, /* R2P */
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0x48, /* W2P */
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0x4c, /* RD_RCD */
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0x50, /* WR_RCD */
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0x54, /* RRD */
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0x58, /* REXT */
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0x5c, /* WDV */
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0x60, /* QUSE */
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0x64, /* QRST */
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0x68, /* QSAFE */
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0x6c, /* RDV */
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0x70, /* REFRESH */
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0x74, /* BURST_REFRESH_NUM */
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0x78, /* PDEX2WR */
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0x7c, /* PDEX2RD */
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0x80, /* PCHG2PDEN */
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0x84, /* ACT2PDEN */
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0x88, /* AR2PDEN */
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0x8c, /* RW2PDEN */
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0x90, /* TXSR */
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0x94, /* TCKE */
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0x98, /* TFAW */
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0x9c, /* TRPAB */
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0xa0, /* TCLKSTABLE */
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0xa4, /* TCLKSTOP */
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0xa8, /* TREFBW */
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0xac, /* QUSE_EXTRA */
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0x114, /* FBIO_CFG6 */
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0xb0, /* ODT_WRITE */
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0xb4, /* ODT_READ */
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0x104, /* FBIO_CFG5 */
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0x2bc, /* CFG_DIG_DLL */
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0x2c0, /* DLL_XFORM_DQS */
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0x2c4, /* DLL_XFORM_QUSE */
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0x2e0, /* ZCAL_REF_CNT */
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0x2e4, /* ZCAL_WAIT_CNT */
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0x2a8, /* AUTO_CAL_INTERVAL */
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0x2d0, /* CFG_CLKTRIM_0 */
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0x2d4, /* CFG_CLKTRIM_1 */
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0x2d8, /* CFG_CLKTRIM_2 */
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};
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/* Select the closest EMC rate that is higher than the requested rate */
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long tegra_emc_round_rate(unsigned long rate)
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{
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struct tegra_emc_pdata *pdata;
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int i;
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int best = -1;
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unsigned long distance = ULONG_MAX;
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if (!emc_pdev)
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return -EINVAL;
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pdata = emc_pdev->dev.platform_data;
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pr_debug("%s: %lu\n", __func__, rate);
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/*
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* The EMC clock rate is twice the bus rate, and the bus rate is
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* measured in kHz
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*/
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rate = rate / 2 / 1000;
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for (i = 0; i < pdata->num_tables; i++) {
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if (pdata->tables[i].rate >= rate &&
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(pdata->tables[i].rate - rate) < distance) {
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distance = pdata->tables[i].rate - rate;
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best = i;
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}
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}
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if (best < 0)
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return -EINVAL;
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pr_debug("%s: using %lu\n", __func__, pdata->tables[best].rate);
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return pdata->tables[best].rate * 2 * 1000;
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}
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/*
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* The EMC registers have shadow registers. When the EMC clock is updated
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* in the clock controller, the shadow registers are copied to the active
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* registers, allowing glitchless memory bus frequency changes.
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* This function updates the shadow registers for a new clock frequency,
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* and relies on the clock lock on the emc clock to avoid races between
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* multiple frequency changes
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*/
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int tegra_emc_set_rate(unsigned long rate)
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{
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struct tegra_emc_pdata *pdata;
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int i;
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int j;
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if (!emc_pdev)
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return -EINVAL;
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pdata = emc_pdev->dev.platform_data;
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/*
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* The EMC clock rate is twice the bus rate, and the bus rate is
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* measured in kHz
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*/
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rate = rate / 2 / 1000;
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for (i = 0; i < pdata->num_tables; i++)
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if (pdata->tables[i].rate == rate)
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break;
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if (i >= pdata->num_tables)
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return -EINVAL;
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pr_debug("%s: setting to %lu\n", __func__, rate);
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for (j = 0; j < TEGRA_EMC_NUM_REGS; j++)
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emc_writel(pdata->tables[i].regs[j], emc_reg_addr[j]);
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emc_readl(pdata->tables[i].regs[TEGRA_EMC_NUM_REGS - 1]);
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return 0;
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}
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#ifdef CONFIG_OF
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static struct device_node *tegra_emc_ramcode_devnode(struct device_node *np)
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{
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struct device_node *iter;
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u32 reg;
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for_each_child_of_node(np, iter) {
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if (of_property_read_u32(iter, "nvidia,ram-code", ®))
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continue;
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if (reg == tegra_bct_strapping)
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return of_node_get(iter);
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}
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return NULL;
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}
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static struct tegra_emc_pdata *tegra_emc_dt_parse_pdata(
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struct platform_device *pdev)
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{
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struct device_node *np = pdev->dev.of_node;
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struct device_node *tnp, *iter;
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struct tegra_emc_pdata *pdata;
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int ret, i, num_tables;
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if (!np)
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return NULL;
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if (of_find_property(np, "nvidia,use-ram-code", NULL)) {
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tnp = tegra_emc_ramcode_devnode(np);
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if (!tnp)
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dev_warn(&pdev->dev,
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"can't find emc table for ram-code 0x%02x\n",
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tegra_bct_strapping);
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} else
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tnp = of_node_get(np);
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if (!tnp)
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return NULL;
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num_tables = 0;
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for_each_child_of_node(tnp, iter)
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if (of_device_is_compatible(iter, "nvidia,tegra20-emc-table"))
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num_tables++;
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if (!num_tables) {
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pdata = NULL;
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goto out;
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}
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pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
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pdata->tables = devm_kzalloc(&pdev->dev,
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sizeof(*pdata->tables) * num_tables,
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GFP_KERNEL);
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i = 0;
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for_each_child_of_node(tnp, iter) {
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u32 prop;
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ret = of_property_read_u32(iter, "clock-frequency", &prop);
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if (ret) {
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dev_err(&pdev->dev, "no clock-frequency in %s\n",
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iter->full_name);
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continue;
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}
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pdata->tables[i].rate = prop;
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ret = of_property_read_u32_array(iter, "nvidia,emc-registers",
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pdata->tables[i].regs,
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TEGRA_EMC_NUM_REGS);
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if (ret) {
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dev_err(&pdev->dev,
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"malformed emc-registers property in %s\n",
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iter->full_name);
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continue;
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}
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i++;
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}
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pdata->num_tables = i;
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out:
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of_node_put(tnp);
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return pdata;
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}
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#else
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static struct tegra_emc_pdata *tegra_emc_dt_parse_pdata(
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struct platform_device *pdev)
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{
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return NULL;
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}
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#endif
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static struct tegra_emc_pdata *tegra_emc_fill_pdata(struct platform_device *pdev)
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{
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struct clk *c = clk_get_sys(NULL, "emc");
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struct tegra_emc_pdata *pdata;
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unsigned long khz;
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int i;
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WARN_ON(pdev->dev.platform_data);
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BUG_ON(IS_ERR(c));
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pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
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pdata->tables = devm_kzalloc(&pdev->dev, sizeof(*pdata->tables),
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GFP_KERNEL);
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pdata->tables[0].rate = clk_get_rate(c) / 2 / 1000;
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for (i = 0; i < TEGRA_EMC_NUM_REGS; i++)
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pdata->tables[0].regs[i] = emc_readl(emc_reg_addr[i]);
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pdata->num_tables = 1;
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khz = pdata->tables[0].rate;
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dev_info(&pdev->dev, "no tables provided, using %ld kHz emc, "
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"%ld kHz mem\n", khz * 2, khz);
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return pdata;
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}
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static int tegra_emc_probe(struct platform_device *pdev)
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{
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struct tegra_emc_pdata *pdata;
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struct resource *res;
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if (!emc_enable) {
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dev_err(&pdev->dev, "disabled per module parameter\n");
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return -ENODEV;
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}
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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emc_regbase = devm_ioremap_resource(&pdev->dev, res);
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if (IS_ERR(emc_regbase))
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return PTR_ERR(emc_regbase);
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pdata = pdev->dev.platform_data;
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if (!pdata)
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pdata = tegra_emc_dt_parse_pdata(pdev);
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if (!pdata)
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pdata = tegra_emc_fill_pdata(pdev);
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pdev->dev.platform_data = pdata;
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emc_pdev = pdev;
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return 0;
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}
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static struct of_device_id tegra_emc_of_match[] = {
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{ .compatible = "nvidia,tegra20-emc", },
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{ },
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};
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static struct platform_driver tegra_emc_driver = {
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.driver = {
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.name = "tegra-emc",
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.owner = THIS_MODULE,
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.of_match_table = tegra_emc_of_match,
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},
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.probe = tegra_emc_probe,
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};
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static int __init tegra_emc_init(void)
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{
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return platform_driver_register(&tegra_emc_driver);
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}
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device_initcall(tegra_emc_init);
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@ -1,24 +0,0 @@
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/*
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* Copyright (C) 2011 Google, Inc.
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*
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* Author:
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* Colin Cross <ccross@android.com>
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#ifndef __MACH_TEGRA_TEGRA2_EMC_H_
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#define __MACH_TEGRA_TEGRA2_EMC_H
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int tegra_emc_set_rate(unsigned long rate);
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long tegra_emc_round_rate(unsigned long rate);
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#endif
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