445 lines
10 KiB
C
445 lines
10 KiB
C
/*
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* Copyright (C) 2014 NVIDIA CORPORATION. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/clk.h>
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#include <linux/interrupt.h>
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#include <linux/kernel.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/slab.h>
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#include <linux/sort.h>
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#include <soc/tegra/fuse.h>
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#include "mc.h"
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#define MC_INTSTATUS 0x000
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#define MC_INT_DECERR_MTS (1 << 16)
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#define MC_INT_SECERR_SEC (1 << 13)
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#define MC_INT_DECERR_VPR (1 << 12)
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#define MC_INT_INVALID_APB_ASID_UPDATE (1 << 11)
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#define MC_INT_INVALID_SMMU_PAGE (1 << 10)
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#define MC_INT_ARBITRATION_EMEM (1 << 9)
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#define MC_INT_SECURITY_VIOLATION (1 << 8)
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#define MC_INT_DECERR_EMEM (1 << 6)
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#define MC_INTMASK 0x004
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#define MC_ERR_STATUS 0x08
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#define MC_ERR_STATUS_TYPE_SHIFT 28
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#define MC_ERR_STATUS_TYPE_INVALID_SMMU_PAGE (6 << MC_ERR_STATUS_TYPE_SHIFT)
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#define MC_ERR_STATUS_TYPE_MASK (0x7 << MC_ERR_STATUS_TYPE_SHIFT)
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#define MC_ERR_STATUS_READABLE (1 << 27)
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#define MC_ERR_STATUS_WRITABLE (1 << 26)
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#define MC_ERR_STATUS_NONSECURE (1 << 25)
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#define MC_ERR_STATUS_ADR_HI_SHIFT 20
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#define MC_ERR_STATUS_ADR_HI_MASK 0x3
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#define MC_ERR_STATUS_SECURITY (1 << 17)
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#define MC_ERR_STATUS_RW (1 << 16)
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#define MC_ERR_ADR 0x0c
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#define MC_EMEM_ARB_CFG 0x90
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#define MC_EMEM_ARB_CFG_CYCLES_PER_UPDATE(x) (((x) & 0x1ff) << 0)
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#define MC_EMEM_ARB_CFG_CYCLES_PER_UPDATE_MASK 0x1ff
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#define MC_EMEM_ARB_MISC0 0xd8
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#define MC_EMEM_ADR_CFG 0x54
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#define MC_EMEM_ADR_CFG_EMEM_NUMDEV BIT(0)
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static const struct of_device_id tegra_mc_of_match[] = {
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#ifdef CONFIG_ARCH_TEGRA_3x_SOC
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{ .compatible = "nvidia,tegra30-mc", .data = &tegra30_mc_soc },
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#endif
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#ifdef CONFIG_ARCH_TEGRA_114_SOC
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{ .compatible = "nvidia,tegra114-mc", .data = &tegra114_mc_soc },
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#endif
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#ifdef CONFIG_ARCH_TEGRA_124_SOC
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{ .compatible = "nvidia,tegra124-mc", .data = &tegra124_mc_soc },
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#endif
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#ifdef CONFIG_ARCH_TEGRA_132_SOC
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{ .compatible = "nvidia,tegra132-mc", .data = &tegra132_mc_soc },
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#endif
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#ifdef CONFIG_ARCH_TEGRA_210_SOC
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{ .compatible = "nvidia,tegra210-mc", .data = &tegra210_mc_soc },
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#endif
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{ }
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};
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MODULE_DEVICE_TABLE(of, tegra_mc_of_match);
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static int tegra_mc_setup_latency_allowance(struct tegra_mc *mc)
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{
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unsigned long long tick;
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unsigned int i;
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u32 value;
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/* compute the number of MC clock cycles per tick */
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tick = mc->tick * clk_get_rate(mc->clk);
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do_div(tick, NSEC_PER_SEC);
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value = readl(mc->regs + MC_EMEM_ARB_CFG);
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value &= ~MC_EMEM_ARB_CFG_CYCLES_PER_UPDATE_MASK;
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value |= MC_EMEM_ARB_CFG_CYCLES_PER_UPDATE(tick);
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writel(value, mc->regs + MC_EMEM_ARB_CFG);
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/* write latency allowance defaults */
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for (i = 0; i < mc->soc->num_clients; i++) {
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const struct tegra_mc_la *la = &mc->soc->clients[i].la;
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u32 value;
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value = readl(mc->regs + la->reg);
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value &= ~(la->mask << la->shift);
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value |= (la->def & la->mask) << la->shift;
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writel(value, mc->regs + la->reg);
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}
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return 0;
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}
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void tegra_mc_write_emem_configuration(struct tegra_mc *mc, unsigned long rate)
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{
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unsigned int i;
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struct tegra_mc_timing *timing = NULL;
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for (i = 0; i < mc->num_timings; i++) {
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if (mc->timings[i].rate == rate) {
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timing = &mc->timings[i];
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break;
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}
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}
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if (!timing) {
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dev_err(mc->dev, "no memory timing registered for rate %lu\n",
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rate);
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return;
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}
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for (i = 0; i < mc->soc->num_emem_regs; ++i)
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mc_writel(mc, timing->emem_data[i], mc->soc->emem_regs[i]);
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}
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unsigned int tegra_mc_get_emem_device_count(struct tegra_mc *mc)
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{
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u8 dram_count;
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dram_count = mc_readl(mc, MC_EMEM_ADR_CFG);
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dram_count &= MC_EMEM_ADR_CFG_EMEM_NUMDEV;
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dram_count++;
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return dram_count;
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}
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static int load_one_timing(struct tegra_mc *mc,
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struct tegra_mc_timing *timing,
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struct device_node *node)
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{
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int err;
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u32 tmp;
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err = of_property_read_u32(node, "clock-frequency", &tmp);
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if (err) {
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dev_err(mc->dev,
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"timing %s: failed to read rate\n", node->name);
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return err;
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}
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timing->rate = tmp;
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timing->emem_data = devm_kcalloc(mc->dev, mc->soc->num_emem_regs,
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sizeof(u32), GFP_KERNEL);
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if (!timing->emem_data)
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return -ENOMEM;
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err = of_property_read_u32_array(node, "nvidia,emem-configuration",
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timing->emem_data,
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mc->soc->num_emem_regs);
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if (err) {
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dev_err(mc->dev,
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"timing %s: failed to read EMEM configuration\n",
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node->name);
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return err;
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}
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return 0;
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}
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static int load_timings(struct tegra_mc *mc, struct device_node *node)
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{
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struct device_node *child;
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struct tegra_mc_timing *timing;
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int child_count = of_get_child_count(node);
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int i = 0, err;
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mc->timings = devm_kcalloc(mc->dev, child_count, sizeof(*timing),
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GFP_KERNEL);
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if (!mc->timings)
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return -ENOMEM;
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mc->num_timings = child_count;
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for_each_child_of_node(node, child) {
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timing = &mc->timings[i++];
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err = load_one_timing(mc, timing, child);
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if (err) {
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of_node_put(child);
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return err;
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}
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}
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return 0;
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}
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static int tegra_mc_setup_timings(struct tegra_mc *mc)
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{
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struct device_node *node;
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u32 ram_code, node_ram_code;
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int err;
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ram_code = tegra_read_ram_code();
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mc->num_timings = 0;
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for_each_child_of_node(mc->dev->of_node, node) {
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err = of_property_read_u32(node, "nvidia,ram-code",
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&node_ram_code);
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if (err || (node_ram_code != ram_code))
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continue;
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err = load_timings(mc, node);
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of_node_put(node);
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if (err)
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return err;
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break;
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}
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if (mc->num_timings == 0)
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dev_warn(mc->dev,
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"no memory timings for RAM code %u registered\n",
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ram_code);
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return 0;
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}
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static const char *const status_names[32] = {
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[ 1] = "External interrupt",
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[ 6] = "EMEM address decode error",
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[ 8] = "Security violation",
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[ 9] = "EMEM arbitration error",
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[10] = "Page fault",
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[11] = "Invalid APB ASID update",
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[12] = "VPR violation",
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[13] = "Secure carveout violation",
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[16] = "MTS carveout violation",
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};
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static const char *const error_names[8] = {
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[2] = "EMEM decode error",
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[3] = "TrustZone violation",
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[4] = "Carveout violation",
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[6] = "SMMU translation error",
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};
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static irqreturn_t tegra_mc_irq(int irq, void *data)
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{
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struct tegra_mc *mc = data;
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unsigned long status, mask;
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unsigned int bit;
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/* mask all interrupts to avoid flooding */
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status = mc_readl(mc, MC_INTSTATUS);
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mask = mc_readl(mc, MC_INTMASK);
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for_each_set_bit(bit, &status, 32) {
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const char *error = status_names[bit] ?: "unknown";
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const char *client = "unknown", *desc;
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const char *direction, *secure;
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phys_addr_t addr = 0;
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unsigned int i;
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char perm[7];
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u8 id, type;
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u32 value;
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value = mc_readl(mc, MC_ERR_STATUS);
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#ifdef CONFIG_PHYS_ADDR_T_64BIT
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if (mc->soc->num_address_bits > 32) {
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addr = ((value >> MC_ERR_STATUS_ADR_HI_SHIFT) &
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MC_ERR_STATUS_ADR_HI_MASK);
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addr <<= 32;
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}
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#endif
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if (value & MC_ERR_STATUS_RW)
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direction = "write";
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else
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direction = "read";
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if (value & MC_ERR_STATUS_SECURITY)
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secure = "secure ";
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else
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secure = "";
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id = value & mc->soc->client_id_mask;
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for (i = 0; i < mc->soc->num_clients; i++) {
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if (mc->soc->clients[i].id == id) {
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client = mc->soc->clients[i].name;
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break;
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}
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}
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type = (value & MC_ERR_STATUS_TYPE_MASK) >>
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MC_ERR_STATUS_TYPE_SHIFT;
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desc = error_names[type];
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switch (value & MC_ERR_STATUS_TYPE_MASK) {
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case MC_ERR_STATUS_TYPE_INVALID_SMMU_PAGE:
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perm[0] = ' ';
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perm[1] = '[';
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if (value & MC_ERR_STATUS_READABLE)
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perm[2] = 'R';
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else
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perm[2] = '-';
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if (value & MC_ERR_STATUS_WRITABLE)
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perm[3] = 'W';
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else
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perm[3] = '-';
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if (value & MC_ERR_STATUS_NONSECURE)
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perm[4] = '-';
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else
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perm[4] = 'S';
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perm[5] = ']';
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perm[6] = '\0';
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break;
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default:
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perm[0] = '\0';
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break;
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}
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value = mc_readl(mc, MC_ERR_ADR);
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addr |= value;
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dev_err_ratelimited(mc->dev, "%s: %s%s @%pa: %s (%s%s)\n",
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client, secure, direction, &addr, error,
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desc, perm);
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}
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/* clear interrupts */
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mc_writel(mc, status, MC_INTSTATUS);
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return IRQ_HANDLED;
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}
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static int tegra_mc_probe(struct platform_device *pdev)
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{
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const struct of_device_id *match;
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struct resource *res;
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struct tegra_mc *mc;
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u32 value;
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int err;
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match = of_match_node(tegra_mc_of_match, pdev->dev.of_node);
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if (!match)
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return -ENODEV;
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mc = devm_kzalloc(&pdev->dev, sizeof(*mc), GFP_KERNEL);
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if (!mc)
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return -ENOMEM;
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platform_set_drvdata(pdev, mc);
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mc->soc = match->data;
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mc->dev = &pdev->dev;
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/* length of MC tick in nanoseconds */
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mc->tick = 30;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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mc->regs = devm_ioremap_resource(&pdev->dev, res);
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if (IS_ERR(mc->regs))
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return PTR_ERR(mc->regs);
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mc->clk = devm_clk_get(&pdev->dev, "mc");
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if (IS_ERR(mc->clk)) {
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dev_err(&pdev->dev, "failed to get MC clock: %ld\n",
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PTR_ERR(mc->clk));
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return PTR_ERR(mc->clk);
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}
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err = tegra_mc_setup_latency_allowance(mc);
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if (err < 0) {
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dev_err(&pdev->dev, "failed to setup latency allowance: %d\n",
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err);
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return err;
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}
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err = tegra_mc_setup_timings(mc);
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if (err < 0) {
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dev_err(&pdev->dev, "failed to setup timings: %d\n", err);
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return err;
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}
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if (IS_ENABLED(CONFIG_TEGRA_IOMMU_SMMU)) {
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mc->smmu = tegra_smmu_probe(&pdev->dev, mc->soc->smmu, mc);
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if (IS_ERR(mc->smmu)) {
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dev_err(&pdev->dev, "failed to probe SMMU: %ld\n",
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PTR_ERR(mc->smmu));
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return PTR_ERR(mc->smmu);
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}
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}
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mc->irq = platform_get_irq(pdev, 0);
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if (mc->irq < 0) {
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dev_err(&pdev->dev, "interrupt not specified\n");
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return mc->irq;
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}
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err = devm_request_irq(&pdev->dev, mc->irq, tegra_mc_irq, IRQF_SHARED,
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dev_name(&pdev->dev), mc);
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if (err < 0) {
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dev_err(&pdev->dev, "failed to request IRQ#%u: %d\n", mc->irq,
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err);
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return err;
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}
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WARN(!mc->soc->client_id_mask, "Missing client ID mask for this SoC\n");
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value = MC_INT_DECERR_MTS | MC_INT_SECERR_SEC | MC_INT_DECERR_VPR |
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MC_INT_INVALID_APB_ASID_UPDATE | MC_INT_INVALID_SMMU_PAGE |
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MC_INT_SECURITY_VIOLATION | MC_INT_DECERR_EMEM;
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mc_writel(mc, value, MC_INTMASK);
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return 0;
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}
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static struct platform_driver tegra_mc_driver = {
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.driver = {
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.name = "tegra-mc",
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.of_match_table = tegra_mc_of_match,
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.suppress_bind_attrs = true,
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},
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.prevent_deferred_probe = true,
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.probe = tegra_mc_probe,
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};
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static int tegra_mc_init(void)
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{
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return platform_driver_register(&tegra_mc_driver);
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}
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arch_initcall(tegra_mc_init);
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MODULE_AUTHOR("Thierry Reding <treding@nvidia.com>");
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MODULE_DESCRIPTION("NVIDIA Tegra Memory Controller driver");
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MODULE_LICENSE("GPL v2");
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