diff options
Diffstat (limited to 'drivers/memory/tegra30-mc.c')
| -rw-r--r-- | drivers/memory/tegra30-mc.c | 382 |
1 files changed, 382 insertions, 0 deletions
diff --git a/drivers/memory/tegra30-mc.c b/drivers/memory/tegra30-mc.c new file mode 100644 index 00000000000..e56ff04eb5c --- /dev/null +++ b/drivers/memory/tegra30-mc.c @@ -0,0 +1,382 @@ +/* + * Tegra30 Memory Controller + * + * Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope 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, write to the Free Software Foundation, Inc., + * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/ratelimit.h> +#include <linux/platform_device.h> +#include <linux/interrupt.h> +#include <linux/io.h> + +#define DRV_NAME "tegra30-mc" + +#define MC_INTSTATUS 0x0 +#define MC_INTMASK 0x4 + +#define MC_INT_ERR_SHIFT 6 +#define MC_INT_ERR_MASK (0x1f << MC_INT_ERR_SHIFT) +#define MC_INT_DECERR_EMEM BIT(MC_INT_ERR_SHIFT) +#define MC_INT_SECURITY_VIOLATION BIT(MC_INT_ERR_SHIFT + 2) +#define MC_INT_ARBITRATION_EMEM BIT(MC_INT_ERR_SHIFT + 3) +#define MC_INT_INVALID_SMMU_PAGE BIT(MC_INT_ERR_SHIFT + 4) + +#define MC_ERR_STATUS 0x8 +#define MC_ERR_ADR 0xc + +#define MC_ERR_TYPE_SHIFT 28 +#define MC_ERR_TYPE_MASK (7 << MC_ERR_TYPE_SHIFT) +#define MC_ERR_TYPE_DECERR_EMEM 2 +#define MC_ERR_TYPE_SECURITY_TRUSTZONE 3 +#define MC_ERR_TYPE_SECURITY_CARVEOUT 4 +#define MC_ERR_TYPE_INVALID_SMMU_PAGE 6 + +#define MC_ERR_INVALID_SMMU_PAGE_SHIFT 25 +#define MC_ERR_INVALID_SMMU_PAGE_MASK (7 << MC_ERR_INVALID_SMMU_PAGE_SHIFT) +#define MC_ERR_RW_SHIFT 16 +#define MC_ERR_RW BIT(MC_ERR_RW_SHIFT) +#define MC_ERR_SECURITY BIT(MC_ERR_RW_SHIFT + 1) + +#define SECURITY_VIOLATION_TYPE BIT(30) /* 0=TRUSTZONE, 1=CARVEOUT */ + +#define MC_EMEM_ARB_CFG 0x90 +#define MC_EMEM_ARB_OUTSTANDING_REQ 0x94 +#define MC_EMEM_ARB_TIMING_RCD 0x98 +#define MC_EMEM_ARB_TIMING_RP 0x9c +#define MC_EMEM_ARB_TIMING_RC 0xa0 +#define MC_EMEM_ARB_TIMING_RAS 0xa4 +#define MC_EMEM_ARB_TIMING_FAW 0xa8 +#define MC_EMEM_ARB_TIMING_RRD 0xac +#define MC_EMEM_ARB_TIMING_RAP2PRE 0xb0 +#define MC_EMEM_ARB_TIMING_WAP2PRE 0xb4 +#define MC_EMEM_ARB_TIMING_R2R 0xb8 +#define MC_EMEM_ARB_TIMING_W2W 0xbc +#define MC_EMEM_ARB_TIMING_R2W 0xc0 +#define MC_EMEM_ARB_TIMING_W2R 0xc4 + +#define MC_EMEM_ARB_DA_TURNS 0xd0 +#define MC_EMEM_ARB_DA_COVERS 0xd4 +#define MC_EMEM_ARB_MISC0 0xd8 +#define MC_EMEM_ARB_MISC1 0xdc + +#define MC_EMEM_ARB_RING3_THROTTLE 0xe4 +#define MC_EMEM_ARB_OVERRIDE 0xe8 + +#define MC_TIMING_CONTROL 0xfc + +#define MC_CLIENT_ID_MASK 0x7f + +#define NUM_MC_REG_BANKS 4 + +struct tegra30_mc { + void __iomem *regs[NUM_MC_REG_BANKS]; + struct device *dev; + u32 ctx[0]; +}; + +static inline u32 mc_readl(struct tegra30_mc *mc, u32 offs) +{ + u32 val = 0; + + if (offs < 0x10) + val = readl(mc->regs[0] + offs); + if (offs < 0x1f0) + val = readl(mc->regs[1] + offs - 0x3c); + if (offs < 0x228) + val = readl(mc->regs[2] + offs - 0x200); + if (offs < 0x400) + val = readl(mc->regs[3] + offs - 0x284); + + return val; +} + +static inline void mc_writel(struct tegra30_mc *mc, u32 val, u32 offs) +{ + if (offs < 0x10) { + writel(val, mc->regs[0] + offs); + return; + } + if (offs < 0x1f0) { + writel(val, mc->regs[1] + offs - 0x3c); + return; + } + if (offs < 0x228) { + writel(val, mc->regs[2] + offs - 0x200); + return; + } + if (offs < 0x400) { + writel(val, mc->regs[3] + offs - 0x284); + return; + } +} + +static const char * const tegra30_mc_client[] = { + "csr_ptcr", + "cbr_display0a", + "cbr_display0ab", + "cbr_display0b", + "cbr_display0bb", + "cbr_display0c", + "cbr_display0cb", + "cbr_display1b", + "cbr_display1bb", + "cbr_eppup", + "cbr_g2pr", + "cbr_g2sr", + "cbr_mpeunifbr", + "cbr_viruv", + "csr_afir", + "csr_avpcarm7r", + "csr_displayhc", + "csr_displayhcb", + "csr_fdcdrd", + "csr_fdcdrd2", + "csr_g2dr", + "csr_hdar", + "csr_host1xdmar", + "csr_host1xr", + "csr_idxsrd", + "csr_idxsrd2", + "csr_mpe_ipred", + "csr_mpeamemrd", + "csr_mpecsrd", + "csr_ppcsahbdmar", + "csr_ppcsahbslvr", + "csr_satar", + "csr_texsrd", + "csr_texsrd2", + "csr_vdebsevr", + "csr_vdember", + "csr_vdemcer", + "csr_vdetper", + "csr_mpcorelpr", + "csr_mpcorer", + "cbw_eppu", + "cbw_eppv", + "cbw_eppy", + "cbw_mpeunifbw", + "cbw_viwsb", + "cbw_viwu", + "cbw_viwv", + "cbw_viwy", + "ccw_g2dw", + "csw_afiw", + "csw_avpcarm7w", + "csw_fdcdwr", + "csw_fdcdwr2", + "csw_hdaw", + "csw_host1xw", + "csw_ispw", + "csw_mpcorelpw", + "csw_mpcorew", + "csw_mpecswr", + "csw_ppcsahbdmaw", + "csw_ppcsahbslvw", + "csw_sataw", + "csw_vdebsevw", + "csw_vdedbgw", + "csw_vdembew", + "csw_vdetpmw", +}; + +static void tegra30_mc_decode(struct tegra30_mc *mc, int n) +{ + u32 err, addr; + const char * const mc_int_err[] = { + "MC_DECERR", + "Unknown", + "MC_SECURITY_ERR", + "MC_ARBITRATION_EMEM", + "MC_SMMU_ERR", + }; + const char * const err_type[] = { + "Unknown", + "Unknown", + "DECERR_EMEM", + "SECURITY_TRUSTZONE", + "SECURITY_CARVEOUT", + "Unknown", + "INVALID_SMMU_PAGE", + "Unknown", + }; + char attr[6]; + int cid, perm, type, idx; + const char *client = "Unknown"; + + idx = n - MC_INT_ERR_SHIFT; + if ((idx < 0) || (idx >= ARRAY_SIZE(mc_int_err)) || (idx == 1)) { + dev_err_ratelimited(mc->dev, "Unknown interrupt status %08lx\n", + BIT(n)); + return; + } + + err = readl(mc + MC_ERR_STATUS); + + type = (err & MC_ERR_TYPE_MASK) >> MC_ERR_TYPE_SHIFT; + perm = (err & MC_ERR_INVALID_SMMU_PAGE_MASK) >> + MC_ERR_INVALID_SMMU_PAGE_SHIFT; + if (type == MC_ERR_TYPE_INVALID_SMMU_PAGE) + sprintf(attr, "%c-%c-%c", + (perm & BIT(2)) ? 'R' : '-', + (perm & BIT(1)) ? 'W' : '-', + (perm & BIT(0)) ? 'S' : '-'); + else + attr[0] = '\0'; + + cid = err & MC_CLIENT_ID_MASK; + if (cid < ARRAY_SIZE(tegra30_mc_client)) + client = tegra30_mc_client[cid]; + + addr = readl(mc + MC_ERR_ADR); + + dev_err_ratelimited(mc->dev, "%s (0x%08x): 0x%08x %s (%s %s %s %s)\n", + mc_int_err[idx], err, addr, client, + (err & MC_ERR_SECURITY) ? "secure" : "non-secure", + (err & MC_ERR_RW) ? "write" : "read", + err_type[type], attr); +} + +static const u32 tegra30_mc_ctx[] = { + MC_EMEM_ARB_CFG, + MC_EMEM_ARB_OUTSTANDING_REQ, + MC_EMEM_ARB_TIMING_RCD, + MC_EMEM_ARB_TIMING_RP, + MC_EMEM_ARB_TIMING_RC, + MC_EMEM_ARB_TIMING_RAS, + MC_EMEM_ARB_TIMING_FAW, + MC_EMEM_ARB_TIMING_RRD, + MC_EMEM_ARB_TIMING_RAP2PRE, + MC_EMEM_ARB_TIMING_WAP2PRE, + MC_EMEM_ARB_TIMING_R2R, + MC_EMEM_ARB_TIMING_W2W, + MC_EMEM_ARB_TIMING_R2W, + MC_EMEM_ARB_TIMING_W2R, + MC_EMEM_ARB_DA_TURNS, + MC_EMEM_ARB_DA_COVERS, + MC_EMEM_ARB_MISC0, + MC_EMEM_ARB_MISC1, + MC_EMEM_ARB_RING3_THROTTLE, + MC_EMEM_ARB_OVERRIDE, + MC_INTMASK, +}; + +static int tegra30_mc_suspend(struct device *dev) +{ + int i; + struct tegra30_mc *mc = dev_get_drvdata(dev); + + for (i = 0; i < ARRAY_SIZE(tegra30_mc_ctx); i++) + mc->ctx[i] = mc_readl(mc, tegra30_mc_ctx[i]); + return 0; +} + +static int tegra30_mc_resume(struct device *dev) +{ + int i; + struct tegra30_mc *mc = dev_get_drvdata(dev); + + for (i = 0; i < ARRAY_SIZE(tegra30_mc_ctx); i++) + mc_writel(mc, mc->ctx[i], tegra30_mc_ctx[i]); + + mc_writel(mc, 1, MC_TIMING_CONTROL); + /* Read-back to ensure that write reached */ + mc_readl(mc, MC_TIMING_CONTROL); + return 0; +} + +static UNIVERSAL_DEV_PM_OPS(tegra30_mc_pm, + tegra30_mc_suspend, + tegra30_mc_resume, NULL); + +static const struct of_device_id tegra30_mc_of_match[] __devinitconst = { + { .compatible = "nvidia,tegra30-mc", }, + {}, +}; + +static irqreturn_t tegra30_mc_isr(int irq, void *data) +{ + u32 stat, mask, bit; + struct tegra30_mc *mc = data; + + stat = mc_readl(mc, MC_INTSTATUS); + mask = mc_readl(mc, MC_INTMASK); + mask &= stat; + if (!mask) + return IRQ_NONE; + while ((bit = ffs(mask)) != 0) + tegra30_mc_decode(mc, bit - 1); + mc_writel(mc, stat, MC_INTSTATUS); + return IRQ_HANDLED; +} + +static int __devinit tegra30_mc_probe(struct platform_device *pdev) +{ + struct resource *irq; + struct tegra30_mc *mc; + size_t bytes; + int err, i; + u32 intmask; + + bytes = sizeof(*mc) + sizeof(u32) * ARRAY_SIZE(tegra30_mc_ctx); + mc = devm_kzalloc(&pdev->dev, bytes, GFP_KERNEL); + if (!mc) + return -ENOMEM; + mc->dev = &pdev->dev; + + for (i = 0; i < ARRAY_SIZE(mc->regs); i++) { + struct resource *res; + + res = platform_get_resource(pdev, IORESOURCE_MEM, i); + if (!res) + return -ENODEV; + mc->regs[i] = devm_request_and_ioremap(&pdev->dev, res); + if (!mc->regs[i]) + return -EBUSY; + } + + irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0); + if (!irq) + return -ENODEV; + err = devm_request_irq(&pdev->dev, irq->start, tegra30_mc_isr, + IRQF_SHARED, dev_name(&pdev->dev), mc); + if (err) + return -ENODEV; + + platform_set_drvdata(pdev, mc); + + intmask = MC_INT_INVALID_SMMU_PAGE | + MC_INT_DECERR_EMEM | MC_INT_SECURITY_VIOLATION; + mc_writel(mc, intmask, MC_INTMASK); + return 0; +} + +static struct platform_driver tegra30_mc_driver = { + .probe = tegra30_mc_probe, + .driver = { + .name = DRV_NAME, + .owner = THIS_MODULE, + .of_match_table = tegra30_mc_of_match, + .pm = &tegra30_mc_pm, + }, +}; +module_platform_driver(tegra30_mc_driver); + +MODULE_AUTHOR("Hiroshi DOYU <hdoyu@nvidia.com>"); +MODULE_DESCRIPTION("Tegra30 MC driver"); +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS("platform:" DRV_NAME); |