diff options
Diffstat (limited to 'arch/powerpc/sysdev')
| -rw-r--r-- | arch/powerpc/sysdev/fsl_lbc.c | 53 |
1 files changed, 49 insertions, 4 deletions
diff --git a/arch/powerpc/sysdev/fsl_lbc.c b/arch/powerpc/sysdev/fsl_lbc.c index 422c8faef59..0494ee55920 100644 --- a/arch/powerpc/sysdev/fsl_lbc.c +++ b/arch/powerpc/sysdev/fsl_lbc.c @@ -11,14 +11,19 @@ * (at your option) any later version. */ +#include <linux/init.h> +#include <linux/module.h> #include <linux/kernel.h> +#include <linux/compiler.h> +#include <linux/spinlock.h> +#include <linux/types.h> +#include <linux/io.h> #include <linux/of.h> +#include <asm/prom.h> #include <asm/fsl_lbc.h> -spinlock_t fsl_lbc_lock = __SPIN_LOCK_UNLOCKED(fsl_lbc_lock); - -struct fsl_lbc_regs __iomem *fsl_lbc_regs; -EXPORT_SYMBOL(fsl_lbc_regs); +static spinlock_t fsl_lbc_lock = __SPIN_LOCK_UNLOCKED(fsl_lbc_lock); +static struct fsl_lbc_regs __iomem *fsl_lbc_regs; static char __initdata *compat_lbc[] = { "fsl,pq2-localbus", @@ -127,3 +132,43 @@ int fsl_upm_find(phys_addr_t addr_base, struct fsl_upm *upm) return 0; } EXPORT_SYMBOL(fsl_upm_find); + +/** + * fsl_upm_run_pattern - actually run an UPM pattern + * @upm: pointer to the fsl_upm structure obtained via fsl_upm_find + * @io_base: remapped pointer to where memory access should happen + * @mar: MAR register content during pattern execution + * + * This function triggers dummy write to the memory specified by the io_base, + * thus UPM pattern actually executed. Note that mar usage depends on the + * pre-programmed AMX bits in the UPM RAM. + */ +int fsl_upm_run_pattern(struct fsl_upm *upm, void __iomem *io_base, u32 mar) +{ + int ret = 0; + unsigned long flags; + + spin_lock_irqsave(&fsl_lbc_lock, flags); + + out_be32(&fsl_lbc_regs->mar, mar << (32 - upm->width)); + + switch (upm->width) { + case 8: + out_8(io_base, 0x0); + break; + case 16: + out_be16(io_base, 0x0); + break; + case 32: + out_be32(io_base, 0x0); + break; + default: + ret = -EINVAL; + break; + } + + spin_unlock_irqrestore(&fsl_lbc_lock, flags); + + return ret; +} +EXPORT_SYMBOL(fsl_upm_run_pattern); |