diff options
Diffstat (limited to 'drivers/media/pci/cx18/cx18-io.h')
| -rw-r--r-- | drivers/media/pci/cx18/cx18-io.h | 177 |
1 files changed, 177 insertions, 0 deletions
diff --git a/drivers/media/pci/cx18/cx18-io.h b/drivers/media/pci/cx18/cx18-io.h new file mode 100644 index 000000000..190b142d0 --- /dev/null +++ b/drivers/media/pci/cx18/cx18-io.h @@ -0,0 +1,177 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * cx18 driver PCI memory mapped IO access routines + * + * Copyright (C) 2007 Hans Verkuil <hverkuil@xs4all.nl> + * Copyright (C) 2008 Andy Walls <awalls@md.metrocast.net> + */ + +#ifndef CX18_IO_H +#define CX18_IO_H + +#include "cx18-driver.h" + +/* + * Readback and retry of MMIO access for reliability: + * The concept was suggested by Steve Toth <stoth@linuxtv.org>. + * The implementation is the fault of Andy Walls <awalls@md.metrocast.net>. + * + * *write* functions are implied to retry the mmio unless suffixed with _noretry + * *read* functions never retry the mmio (it never helps to do so) + */ + +/* Non byteswapping memory mapped IO */ +static inline u32 cx18_raw_readl(struct cx18 *cx, const void __iomem *addr) +{ + return __raw_readl(addr); +} + +static inline +void cx18_raw_writel_noretry(struct cx18 *cx, u32 val, void __iomem *addr) +{ + __raw_writel(val, addr); +} + +static inline void cx18_raw_writel(struct cx18 *cx, u32 val, void __iomem *addr) +{ + int i; + for (i = 0; i < CX18_MAX_MMIO_WR_RETRIES; i++) { + cx18_raw_writel_noretry(cx, val, addr); + if (val == cx18_raw_readl(cx, addr)) + break; + } +} + +/* Normal memory mapped IO */ +static inline u32 cx18_readl(struct cx18 *cx, const void __iomem *addr) +{ + return readl(addr); +} + +static inline +void cx18_writel_noretry(struct cx18 *cx, u32 val, void __iomem *addr) +{ + writel(val, addr); +} + +static inline void cx18_writel(struct cx18 *cx, u32 val, void __iomem *addr) +{ + int i; + for (i = 0; i < CX18_MAX_MMIO_WR_RETRIES; i++) { + cx18_writel_noretry(cx, val, addr); + if (val == cx18_readl(cx, addr)) + break; + } +} + +static inline +void cx18_writel_expect(struct cx18 *cx, u32 val, void __iomem *addr, + u32 eval, u32 mask) +{ + int i; + u32 r; + eval &= mask; + for (i = 0; i < CX18_MAX_MMIO_WR_RETRIES; i++) { + cx18_writel_noretry(cx, val, addr); + r = cx18_readl(cx, addr); + if (r == 0xffffffff && eval != 0xffffffff) + continue; + if (eval == (r & mask)) + break; + } +} + +static inline u16 cx18_readw(struct cx18 *cx, const void __iomem *addr) +{ + return readw(addr); +} + +static inline +void cx18_writew_noretry(struct cx18 *cx, u16 val, void __iomem *addr) +{ + writew(val, addr); +} + +static inline void cx18_writew(struct cx18 *cx, u16 val, void __iomem *addr) +{ + int i; + for (i = 0; i < CX18_MAX_MMIO_WR_RETRIES; i++) { + cx18_writew_noretry(cx, val, addr); + if (val == cx18_readw(cx, addr)) + break; + } +} + +static inline u8 cx18_readb(struct cx18 *cx, const void __iomem *addr) +{ + return readb(addr); +} + +static inline +void cx18_writeb_noretry(struct cx18 *cx, u8 val, void __iomem *addr) +{ + writeb(val, addr); +} + +static inline void cx18_writeb(struct cx18 *cx, u8 val, void __iomem *addr) +{ + int i; + for (i = 0; i < CX18_MAX_MMIO_WR_RETRIES; i++) { + cx18_writeb_noretry(cx, val, addr); + if (val == cx18_readb(cx, addr)) + break; + } +} + +static inline +void cx18_memcpy_fromio(struct cx18 *cx, void *to, + const void __iomem *from, unsigned int len) +{ + memcpy_fromio(to, from, len); +} + +void cx18_memset_io(struct cx18 *cx, void __iomem *addr, int val, size_t count); + + +/* Access "register" region of CX23418 memory mapped I/O */ +static inline void cx18_write_reg_noretry(struct cx18 *cx, u32 val, u32 reg) +{ + cx18_writel_noretry(cx, val, cx->reg_mem + reg); +} + +static inline void cx18_write_reg(struct cx18 *cx, u32 val, u32 reg) +{ + cx18_writel(cx, val, cx->reg_mem + reg); +} + +static inline void cx18_write_reg_expect(struct cx18 *cx, u32 val, u32 reg, + u32 eval, u32 mask) +{ + cx18_writel_expect(cx, val, cx->reg_mem + reg, eval, mask); +} + +static inline u32 cx18_read_reg(struct cx18 *cx, u32 reg) +{ + return cx18_readl(cx, cx->reg_mem + reg); +} + + +/* Access "encoder memory" region of CX23418 memory mapped I/O */ +static inline void cx18_write_enc(struct cx18 *cx, u32 val, u32 addr) +{ + cx18_writel(cx, val, cx->enc_mem + addr); +} + +static inline u32 cx18_read_enc(struct cx18 *cx, u32 addr) +{ + return cx18_readl(cx, cx->enc_mem + addr); +} + +void cx18_sw1_irq_enable(struct cx18 *cx, u32 val); +void cx18_sw1_irq_disable(struct cx18 *cx, u32 val); +void cx18_sw2_irq_enable(struct cx18 *cx, u32 val); +void cx18_sw2_irq_disable(struct cx18 *cx, u32 val); +void cx18_sw2_irq_disable_cpu(struct cx18 *cx, u32 val); +void cx18_setup_page(struct cx18 *cx, u32 addr); + +#endif /* CX18_IO_H */ |