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linux-pinenote/drivers/memory/tegra30-mc.c
Julia Lawall 946a88df76 tegra: simplify use of devm_ioremap_resource 
Remove unneeded error handling on the result of a call to
platform_get_resource when the value is passed to devm_ioremap_resource.

A simplified version of the semantic patch that makes this change is as
follows: (http://coccinelle.lip6.fr/)

// <smpl>
@@
expression pdev,res,n,e,e1;
expression ret != 0;
identifier l;
@@

- res = platform_get_resource(pdev, IORESOURCE_MEM, n);
  ... when != res
- if (res == NULL) { ... \(goto l;\|return ret;\) }
  ... when != res
+ res = platform_get_resource(pdev, IORESOURCE_MEM, n);
  e = devm_ioremap_resource(e1, res);
// </smpl>

Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: Stephen Warren <swarren@nvidia.com>
2013-08-15 16:04:42 -06:00

378 lines
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/*
* 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/err.h>
#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);
else if (offs < 0x1f0)
val = readl(mc->regs[1] + offs - 0x3c);
else if (offs < 0x228)
val = readl(mc->regs[2] + offs - 0x200);
else 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);
else if (offs < 0x1f0)
writel(val, mc->regs[1] + offs - 0x3c);
else if (offs < 0x228)
writel(val, mc->regs[2] + offs - 0x200);
else if (offs < 0x400)
writel(val, mc->regs[3] + offs - 0x284);
}
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 = mc_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 = mc_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,
};
#ifdef CONFIG_PM
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;
}
#endif
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[] = {
{ .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);
mask &= ~BIT(bit - 1);
}
mc_writel(mc, stat, MC_INTSTATUS);
return IRQ_HANDLED;
}
static int 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);
mc->regs[i] = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(mc->regs[i]))
return PTR_ERR(mc->regs[i]);
}
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);
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