diff options
Diffstat (limited to 'drivers/bus/brcmstb_gisb.c')
| -rw-r--r-- | drivers/bus/brcmstb_gisb.c | 167 |
1 files changed, 141 insertions, 26 deletions
diff --git a/drivers/bus/brcmstb_gisb.c b/drivers/bus/brcmstb_gisb.c index f2cd6a2d40b4..46de8dc39eb4 100644 --- a/drivers/bus/brcmstb_gisb.c +++ b/drivers/bus/brcmstb_gisb.c @@ -23,35 +23,103 @@ #include <linux/list.h> #include <linux/of.h> #include <linux/bitops.h> +#include <linux/pm.h> +#ifdef CONFIG_ARM #include <asm/bug.h> #include <asm/signal.h> +#endif -#define ARB_TIMER 0x008 -#define ARB_ERR_CAP_CLR 0x7e4 #define ARB_ERR_CAP_CLEAR (1 << 0) -#define ARB_ERR_CAP_HI_ADDR 0x7e8 -#define ARB_ERR_CAP_ADDR 0x7ec -#define ARB_ERR_CAP_DATA 0x7f0 -#define ARB_ERR_CAP_STATUS 0x7f4 #define ARB_ERR_CAP_STATUS_TIMEOUT (1 << 12) #define ARB_ERR_CAP_STATUS_TEA (1 << 11) #define ARB_ERR_CAP_STATUS_BS_SHIFT (1 << 2) #define ARB_ERR_CAP_STATUS_BS_MASK 0x3c #define ARB_ERR_CAP_STATUS_WRITE (1 << 1) #define ARB_ERR_CAP_STATUS_VALID (1 << 0) -#define ARB_ERR_CAP_MASTER 0x7f8 + +enum { + ARB_TIMER, + ARB_ERR_CAP_CLR, + ARB_ERR_CAP_HI_ADDR, + ARB_ERR_CAP_ADDR, + ARB_ERR_CAP_DATA, + ARB_ERR_CAP_STATUS, + ARB_ERR_CAP_MASTER, +}; + +static const int gisb_offsets_bcm7038[] = { + [ARB_TIMER] = 0x00c, + [ARB_ERR_CAP_CLR] = 0x0c4, + [ARB_ERR_CAP_HI_ADDR] = -1, + [ARB_ERR_CAP_ADDR] = 0x0c8, + [ARB_ERR_CAP_DATA] = 0x0cc, + [ARB_ERR_CAP_STATUS] = 0x0d0, + [ARB_ERR_CAP_MASTER] = -1, +}; + +static const int gisb_offsets_bcm7400[] = { + [ARB_TIMER] = 0x00c, + [ARB_ERR_CAP_CLR] = 0x0c8, + [ARB_ERR_CAP_HI_ADDR] = -1, + [ARB_ERR_CAP_ADDR] = 0x0cc, + [ARB_ERR_CAP_DATA] = 0x0d0, + [ARB_ERR_CAP_STATUS] = 0x0d4, + [ARB_ERR_CAP_MASTER] = 0x0d8, +}; + +static const int gisb_offsets_bcm7435[] = { + [ARB_TIMER] = 0x00c, + [ARB_ERR_CAP_CLR] = 0x168, + [ARB_ERR_CAP_HI_ADDR] = -1, + [ARB_ERR_CAP_ADDR] = 0x16c, + [ARB_ERR_CAP_DATA] = 0x170, + [ARB_ERR_CAP_STATUS] = 0x174, + [ARB_ERR_CAP_MASTER] = 0x178, +}; + +static const int gisb_offsets_bcm7445[] = { + [ARB_TIMER] = 0x008, + [ARB_ERR_CAP_CLR] = 0x7e4, + [ARB_ERR_CAP_HI_ADDR] = 0x7e8, + [ARB_ERR_CAP_ADDR] = 0x7ec, + [ARB_ERR_CAP_DATA] = 0x7f0, + [ARB_ERR_CAP_STATUS] = 0x7f4, + [ARB_ERR_CAP_MASTER] = 0x7f8, +}; struct brcmstb_gisb_arb_device { void __iomem *base; + const int *gisb_offsets; struct mutex lock; struct list_head next; u32 valid_mask; const char *master_names[sizeof(u32) * BITS_PER_BYTE]; + u32 saved_timeout; }; static LIST_HEAD(brcmstb_gisb_arb_device_list); +static u32 gisb_read(struct brcmstb_gisb_arb_device *gdev, int reg) +{ + int offset = gdev->gisb_offsets[reg]; + + /* return 1 if the hardware doesn't have ARB_ERR_CAP_MASTER */ + if (offset == -1) + return 1; + + return ioread32(gdev->base + offset); +} + +static void gisb_write(struct brcmstb_gisb_arb_device *gdev, u32 val, int reg) +{ + int offset = gdev->gisb_offsets[reg]; + + if (offset == -1) + return; + iowrite32(val, gdev->base + reg); +} + static ssize_t gisb_arb_get_timeout(struct device *dev, struct device_attribute *attr, char *buf) @@ -61,7 +129,7 @@ static ssize_t gisb_arb_get_timeout(struct device *dev, u32 timeout; mutex_lock(&gdev->lock); - timeout = ioread32(gdev->base + ARB_TIMER); + timeout = gisb_read(gdev, ARB_TIMER); mutex_unlock(&gdev->lock); return sprintf(buf, "%d", timeout); @@ -83,7 +151,7 @@ static ssize_t gisb_arb_set_timeout(struct device *dev, return -EINVAL; mutex_lock(&gdev->lock); - iowrite32(val, gdev->base + ARB_TIMER); + gisb_write(gdev, val, ARB_TIMER); mutex_unlock(&gdev->lock); return count; @@ -110,18 +178,18 @@ static int brcmstb_gisb_arb_decode_addr(struct brcmstb_gisb_arb_device *gdev, const char *m_name; char m_fmt[11]; - cap_status = ioread32(gdev->base + ARB_ERR_CAP_STATUS); + cap_status = gisb_read(gdev, ARB_ERR_CAP_STATUS); /* Invalid captured address, bail out */ if (!(cap_status & ARB_ERR_CAP_STATUS_VALID)) return 1; /* Read the address and master */ - arb_addr = ioread32(gdev->base + ARB_ERR_CAP_ADDR) & 0xffffffff; + arb_addr = gisb_read(gdev, ARB_ERR_CAP_ADDR) & 0xffffffff; #if (IS_ENABLED(CONFIG_PHYS_ADDR_T_64BIT)) - arb_addr |= (u64)ioread32(gdev->base + ARB_ERR_CAP_HI_ADDR) << 32; + arb_addr |= (u64)gisb_read(gdev, ARB_ERR_CAP_HI_ADDR) << 32; #endif - master = ioread32(gdev->base + ARB_ERR_CAP_MASTER); + master = gisb_read(gdev, ARB_ERR_CAP_MASTER); m_name = brcmstb_gisb_master_to_str(gdev, master); if (!m_name) { @@ -136,11 +204,12 @@ static int brcmstb_gisb_arb_decode_addr(struct brcmstb_gisb_arb_device *gdev, m_name); /* clear the GISB error */ - iowrite32(ARB_ERR_CAP_CLEAR, gdev->base + ARB_ERR_CAP_CLR); + gisb_write(gdev, ARB_ERR_CAP_CLEAR, ARB_ERR_CAP_CLR); return 0; } +#ifdef CONFIG_ARM static int brcmstb_bus_error_handler(unsigned long addr, unsigned int fsr, struct pt_regs *regs) { @@ -159,12 +228,7 @@ static int brcmstb_bus_error_handler(unsigned long addr, unsigned int fsr, return ret; } - -void __init brcmstb_hook_fault_code(void) -{ - hook_fault_code(22, brcmstb_bus_error_handler, SIGBUS, 0, - "imprecise external abort"); -} +#endif static irqreturn_t brcmstb_gisb_timeout_handler(int irq, void *dev_id) { @@ -192,10 +256,20 @@ static struct attribute_group gisb_arb_sysfs_attr_group = { .attrs = gisb_arb_sysfs_attrs, }; -static int brcmstb_gisb_arb_probe(struct platform_device *pdev) +static const struct of_device_id brcmstb_gisb_arb_of_match[] = { + { .compatible = "brcm,gisb-arb", .data = gisb_offsets_bcm7445 }, + { .compatible = "brcm,bcm7445-gisb-arb", .data = gisb_offsets_bcm7445 }, + { .compatible = "brcm,bcm7435-gisb-arb", .data = gisb_offsets_bcm7435 }, + { .compatible = "brcm,bcm7400-gisb-arb", .data = gisb_offsets_bcm7400 }, + { .compatible = "brcm,bcm7038-gisb-arb", .data = gisb_offsets_bcm7038 }, + { }, +}; + +static int __init brcmstb_gisb_arb_probe(struct platform_device *pdev) { struct device_node *dn = pdev->dev.of_node; struct brcmstb_gisb_arb_device *gdev; + const struct of_device_id *of_id; struct resource *r; int err, timeout_irq, tea_irq; unsigned int num_masters, j = 0; @@ -216,6 +290,13 @@ static int brcmstb_gisb_arb_probe(struct platform_device *pdev) if (IS_ERR(gdev->base)) return PTR_ERR(gdev->base); + of_id = of_match_node(brcmstb_gisb_arb_of_match, dn); + if (!of_id) { + pr_err("failed to look up compatible string\n"); + return -EINVAL; + } + gdev->gisb_offsets = of_id->data; + err = devm_request_irq(&pdev->dev, timeout_irq, brcmstb_gisb_timeout_handler, 0, pdev->name, gdev); @@ -261,29 +342,63 @@ static int brcmstb_gisb_arb_probe(struct platform_device *pdev) list_add_tail(&gdev->next, &brcmstb_gisb_arb_device_list); +#ifdef CONFIG_ARM + hook_fault_code(22, brcmstb_bus_error_handler, SIGBUS, 0, + "imprecise external abort"); +#endif + dev_info(&pdev->dev, "registered mem: %p, irqs: %d, %d\n", gdev->base, timeout_irq, tea_irq); return 0; } -static const struct of_device_id brcmstb_gisb_arb_of_match[] = { - { .compatible = "brcm,gisb-arb" }, - { }, +#ifdef CONFIG_PM_SLEEP +static int brcmstb_gisb_arb_suspend(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + struct brcmstb_gisb_arb_device *gdev = platform_get_drvdata(pdev); + + gdev->saved_timeout = gisb_read(gdev, ARB_TIMER); + + return 0; +} + +/* Make sure we provide the same timeout value that was configured before, and + * do this before the GISB timeout interrupt handler has any chance to run. + */ +static int brcmstb_gisb_arb_resume_noirq(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + struct brcmstb_gisb_arb_device *gdev = platform_get_drvdata(pdev); + + gisb_write(gdev, gdev->saved_timeout, ARB_TIMER); + + return 0; +} +#else +#define brcmstb_gisb_arb_suspend NULL +#define brcmstb_gisb_arb_resume_noirq NULL +#endif + +static const struct dev_pm_ops brcmstb_gisb_arb_pm_ops = { + .suspend = brcmstb_gisb_arb_suspend, + .resume_noirq = brcmstb_gisb_arb_resume_noirq, }; static struct platform_driver brcmstb_gisb_arb_driver = { - .probe = brcmstb_gisb_arb_probe, .driver = { .name = "brcm-gisb-arb", .owner = THIS_MODULE, .of_match_table = brcmstb_gisb_arb_of_match, + .pm = &brcmstb_gisb_arb_pm_ops, }, }; static int __init brcm_gisb_driver_init(void) { - return platform_driver_register(&brcmstb_gisb_arb_driver); + return platform_driver_probe(&brcmstb_gisb_arb_driver, + brcmstb_gisb_arb_probe); } module_init(brcm_gisb_driver_init); |