From: Oliver Schinagl oliver@schinagl.nl
The A31 uses a new push-pull two wire interface, which features higher transfer speeds (upto 6 MHz) in theory. While the hardware can burst 8 bytes each time, this driver will only see very little use and thus is limited to single byte transmission only.
Signed-off-by: Oliver Schinagl oliver@schinagl.nl Signed-off-by: Hans de Goede hdegoede@redhat.com --- arch/arm/cpu/armv7/sunxi/Makefile | 1 + arch/arm/cpu/armv7/sunxi/p2wi.c | 117 +++++++++++++++++++++++++++ arch/arm/include/asm/arch-sunxi/gpio.h | 3 + arch/arm/include/asm/arch-sunxi/p2wi.h | 140 +++++++++++++++++++++++++++++++++ 4 files changed, 261 insertions(+) create mode 100644 arch/arm/cpu/armv7/sunxi/p2wi.c create mode 100644 arch/arm/include/asm/arch-sunxi/p2wi.h
diff --git a/arch/arm/cpu/armv7/sunxi/Makefile b/arch/arm/cpu/armv7/sunxi/Makefile index 82dbf76..b3a3601 100644 --- a/arch/arm/cpu/armv7/sunxi/Makefile +++ b/arch/arm/cpu/armv7/sunxi/Makefile @@ -13,6 +13,7 @@ obj-y += clock.o obj-y += pinmux.o obj-$(CONFIG_MACH_SUN6I) += prcm.o obj-$(CONFIG_MACH_SUN8I) += prcm.o +obj-$(CONFIG_MACH_SUN6I) += p2wi.o obj-$(CONFIG_MACH_SUN4I) += clock_sun4i.o obj-$(CONFIG_MACH_SUN5I) += clock_sun4i.o obj-$(CONFIG_MACH_SUN6I) += clock_sun6i.o diff --git a/arch/arm/cpu/armv7/sunxi/p2wi.c b/arch/arm/cpu/armv7/sunxi/p2wi.c new file mode 100644 index 0000000..8d58955 --- /dev/null +++ b/arch/arm/cpu/armv7/sunxi/p2wi.c @@ -0,0 +1,117 @@ +/* + * Sunxi A31 Power Management Unit + * + * (C) Copyright 2013 Oliver Schinagl oliver@schinagl.nl + * http://linux-sunxi.org + * + * Based on sun6i sources and earlier U-Boot Allwiner A10 SPL work + * + * (C) Copyright 2006-2013 + * Allwinner Technology Co., Ltd. <www.allwinnertech.com> + * Berg Xing bergxing@allwinnertech.com + * Tom Cubie tangliang@allwinnertech.com + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <common.h> +#include <errno.h> +#include <asm/io.h> +#include <asm/arch/cpu.h> +#include <asm/arch/gpio.h> +#include <asm/arch/p2wi.h> +#include <asm/arch/prcm.h> +#include <asm/arch/clock.h> +#include <asm/arch/sys_proto.h> + +void p2wi_init(void) +{ + struct sunxi_p2wi_reg *p2wi = (struct sunxi_p2wi_reg *)SUNXI_P2WI_BASE; + + /* Enable p2wi and PIO clk, and de-assert their resets */ + prcm_apb0_enable(PRCM_APB0_GATE_PIO | PRCM_APB0_GATE_P2WI); + + sunxi_gpio_set_cfgpin(SUNXI_GPL(0), SUNXI_GPL0_R_P2WI_SCK); + sunxi_gpio_set_cfgpin(SUNXI_GPL(1), SUNXI_GPL1_R_P2WI_SDA); + + /* Reset p2wi controller and set clock to CLKIN(12)/8 = 1.5 MHz */ + writel(P2WI_CTRL_RESET, &p2wi->ctrl); + sdelay(0x100); + writel(P2WI_CC_SDA_OUT_DELAY(1) | P2WI_CC_CLK_DIV(8), + &p2wi->cc); +} + +int p2wi_change_to_p2wi_mode(u8 slave_addr, u8 ctrl_reg, u8 init_data) +{ + struct sunxi_p2wi_reg *p2wi = (struct sunxi_p2wi_reg *)SUNXI_P2WI_BASE; + unsigned long tmo = timer_get_us() + 1000000; + + writel(P2WI_PM_DEV_ADDR(slave_addr) | + P2WI_PM_CTRL_ADDR(ctrl_reg) | + P2WI_PM_INIT_DATA(init_data) | + P2WI_PM_INIT_SEND, + &p2wi->pm); + + while ((readl(&p2wi->pm) & P2WI_PM_INIT_SEND)) { + if (timer_get_us() > tmo) + return -EFAULT; + } + + return 0; +} + +static int p2wi_await_trans(void) +{ + struct sunxi_p2wi_reg *p2wi = (struct sunxi_p2wi_reg *)SUNXI_P2WI_BASE; + unsigned long tmo = timer_get_us() + 1000000; + int ret; + u8 reg; + + while (1) { + reg = readl(&p2wi->status); + if (reg & P2WI_STAT_TRANS_ERR) { + ret = -EIO; + break; + } + if (reg & P2WI_STAT_TRANS_DONE) { + ret = 0; + break; + } + if (timer_get_us() > tmo) { + ret = -ETIME; + break; + } + } + writel(reg, &p2wi->status); /* Clear status bits */ + return ret; +} + +int p2wi_read(const u8 addr, u8 *data) +{ + struct sunxi_p2wi_reg *p2wi = (struct sunxi_p2wi_reg *)SUNXI_P2WI_BASE; + int ret; + + writel(P2WI_DATADDR_BYTE_1(addr), &p2wi->dataddr0); + writel(P2WI_DATA_NUM_BYTES(1) | + P2WI_DATA_NUM_BYTES_READ, &p2wi->numbytes); + writel(P2WI_STAT_TRANS_DONE, &p2wi->status); + writel(P2WI_CTRL_TRANS_START, &p2wi->ctrl); + + ret = p2wi_await_trans(); + + *data = readl(&p2wi->data0) & P2WI_DATA_BYTE_1_MASK; + return ret; +} + +int p2wi_write(const u8 addr, u8 data) +{ + struct sunxi_p2wi_reg *p2wi = (struct sunxi_p2wi_reg *)SUNXI_P2WI_BASE; + + writel(P2WI_DATADDR_BYTE_1(addr), &p2wi->dataddr0); + writel(P2WI_DATA_BYTE_1(data), &p2wi->data0); + writel(P2WI_DATA_NUM_BYTES(1), &p2wi->numbytes); + writel(P2WI_STAT_TRANS_DONE, &p2wi->status); + writel(P2WI_CTRL_TRANS_START, &p2wi->ctrl); + + return p2wi_await_trans(); +} diff --git a/arch/arm/include/asm/arch-sunxi/gpio.h b/arch/arm/include/asm/arch-sunxi/gpio.h index 437dd35..c734cf0 100644 --- a/arch/arm/include/asm/arch-sunxi/gpio.h +++ b/arch/arm/include/asm/arch-sunxi/gpio.h @@ -172,6 +172,9 @@ enum sunxi_gpio_number {
#define SUN4I_GPI4_SDC3 2
+#define SUNXI_GPL0_R_P2WI_SCK 3 +#define SUNXI_GPL1_R_P2WI_SDA 3 + #define SUN8I_GPL2_R_UART_TX 2 #define SUN8I_GPL3_R_UART_RX 2
diff --git a/arch/arm/include/asm/arch-sunxi/p2wi.h b/arch/arm/include/asm/arch-sunxi/p2wi.h new file mode 100644 index 0000000..2cf2d51 --- /dev/null +++ b/arch/arm/include/asm/arch-sunxi/p2wi.h @@ -0,0 +1,140 @@ +/* + * Sunxi platform Push-Push i2c register definition. + * + * (c) Copyright 2013 Oliver Schinagl oliver@schinagl.nl + * http://linux-sunxi.org + * + * (c)Copyright 2006-2013 + * Allwinner Technology Co., Ltd. <www.allwinnertech.com> + * Berg Xing bergxing@allwinnertech.com + * Tom Cubie tangliang@allwinnertech.com + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#ifndef _SUNXI_P2WI_H +#define _SUNXI_P2WI_H + +#include <linux/types.h> + +#define P2WI_CTRL_RESET (0x1 << 0) +#define P2WI_CTRL_IRQ_EN (0x1 << 1) +#define P2WI_CTRL_TRANS_ABORT (0x1 << 6) +#define P2WI_CTRL_TRANS_START (0x1 << 7) + +#define __P2WI_CC_CLK(n) (((n) & 0xff) << 0) +#define P2WI_CC_CLK_MASK __P2WI_CC_CLK_DIV(0xff) +#define __P2WI_CC_CLK_DIV(n) (((n) >> 1) - 1) +#define P2WI_CC_CLK_DIV(n) \ + __P2WI_CC_CLK(__P2WI_CC_CLK_DIV(n)) +#define P2WI_CC_SDA_OUT_DELAY(n) (((n) & 0x7) << 8) +#define P2WI_CC_SDA_OUT_DELAY_MASK P2WI_CC_SDA_OUT_DELAY(0x7) + +#define P2WI_IRQ_TRANS_DONE (0x1 << 0) +#define P2WI_IRQ_TRANS_ERR (0x1 << 1) +#define P2WI_IRQ_LOAD_BUSY (0x1 << 2) + +#define P2WI_STAT_TRANS_DONE (0x1 << 0) +#define P2WI_STAT_TRANS_ERR (0x1 << 1) +#define P2WI_STAT_LOAD_BUSY (0x1 << 2) +#define __P2WI_STAT_TRANS_ERR(n) (((n) & 0xff) << 8) +#define P2WI_STAT_TRANS_ERR_MASK __P2WI_STAT_TRANS_ERR_ID(0xff) +#define __P2WI_STAT_TRANS_ERR_BYTE_1 0x01 +#define __P2WI_STAT_TRANS_ERR_BYTE_2 0x02 +#define __P2WI_STAT_TRANS_ERR_BYTE_3 0x04 +#define __P2WI_STAT_TRANS_ERR_BYTE_4 0x08 +#define __P2WI_STAT_TRANS_ERR_BYTE_5 0x10 +#define __P2WI_STAT_TRANS_ERR_BYTE_6 0x20 +#define __P2WI_STAT_TRANS_ERR_BYTE_7 0x40 +#define __P2WI_STAT_TRANS_ERR_BYTE_8 0x80 +#define P2WI_STAT_TRANS_ERR_BYTE_1 \ + __P2WI_STAT_TRANS_ERR(__P2WI_STAT_TRANS_ERR_BYTE_1) +#define P2WI_STAT_TRANS_ERR_BYTE_2 \ + __P2WI_STAT_TRANS_ERR(__P2WI_STAT_TRANS_ERR_BYTE_2) +#define P2WI_STAT_TRANS_ERR_BYTE_3 \ + __P2WI_STAT_TRANS_ERR(__P2WI_STAT_TRANS_ERR_BYTE_3) +#define P2WI_STAT_TRANS_ERR_BYTE_4 \ + __P2WI_STAT_TRANS_ERR(__P2WI_STAT_TRANS_ERR_BYTE_4) +#define P2WI_STAT_TRANS_ERR_BYTE_5 \ + __P2WI_STAT_TRANS_ERR(__P2WI_STAT_TRANS_ERR_BYTE_5) +#define P2WI_STAT_TRANS_ERR_BYTE_6 \ + __P2WI_STAT_TRANS_ERR(__P2WI_STAT_TRANS_ERR_BYTE_6) +#define P2WI_STAT_TRANS_ERR_BYTE_7 \ + __P2WI_STAT_TRANS_ERR(__P2WI_STAT_TRANS_ERR_BYTE_7) +#define P2WI_STAT_TRANS_ERR_BYTE_8 \ + __P2WI_STAT_TRANS_ERR(__P2WI_STAT_TRANS_ERR_BYTE_8) + +#define P2WI_DATADDR_BYTE_1(n) (((n) & 0xff) << 0) +#define P2WI_DATADDR_BYTE_1_MASK P2WI_DATADDR_BYTE_1(0xff) +#define P2WI_DATADDR_BYTE_2(n) (((n) & 0xff) << 8) +#define P2WI_DATADDR_BYTE_2_MASK P2WI_DATADDR_BYTE_2(0xff) +#define P2WI_DATADDR_BYTE_3(n) (((n) & 0xff) << 16) +#define P2WI_DATADDR_BYTE_3_MASK P2WI_DATADDR_BYTE_3(0xff) +#define P2WI_DATADDR_BYTE_4(n) (((n) & 0xff) << 24) +#define P2WI_DATADDR_BYTE_4_MASK P2WI_DATADDR_BYTE_4(0xff) +#define P2WI_DATADDR_BYTE_5(n) (((n) & 0xff) << 0) +#define P2WI_DATADDR_BYTE_5_MASK P2WI_DATADDR_BYTE_5(0xff) +#define P2WI_DATADDR_BYTE_6(n) (((n) & 0xff) << 8) +#define P2WI_DATADDR_BYTE_6_MASK P2WI_DATADDR_BYTE_6(0xff) +#define P2WI_DATADDR_BYTE_7(n) (((n) & 0xff) << 16) +#define P2WI_DATADDR_BYTE_7_MASK P2WI_DATADDR_BYTE_7(0xff) +#define P2WI_DATADDR_BYTE_8(n) (((n) & 0xff) << 24) +#define P2WI_DATADDR_BYTE_8_MASK P2WI_DATADDR_BYTE_8(0xff) + +#define __P2WI_DATA_NUM_BYTES(n) (((n) & 0x7) << 0) +#define P2WI_DATA_NUM_BYTES_MASK __P2WI_DATA_NUM_BYTES(0x7) +#define P2WI_DATA_NUM_BYTES(n) __P2WI_DATA_NUM_BYTES((n) - 1) +#define P2WI_DATA_NUM_BYTES_READ (0x1 << 4) + +#define P2WI_DATA_BYTE_1(n) (((n) & 0xff) << 0) +#define P2WI_DATA_BYTE_1_MASK P2WI_DATA_BYTE_1(0xff) +#define P2WI_DATA_BYTE_2(n) (((n) & 0xff) << 8) +#define P2WI_DATA_BYTE_2_MASK P2WI_DATA_BYTE_2(0xff) +#define P2WI_DATA_BYTE_3(n) (((n) & 0xff) << 16) +#define P2WI_DATA_BYTE_3_MASK P2WI_DATA_BYTE_3(0xff) +#define P2WI_DATA_BYTE_4(n) (((n) & 0xff) << 24) +#define P2WI_DATA_BYTE_4_MASK P2WI_DATA_BYTE_4(0xff) +#define P2WI_DATA_BYTE_5(n) (((n) & 0xff) << 0) +#define P2WI_DATA_BYTE_5_MASK P2WI_DATA_BYTE_5(0xff) +#define P2WI_DATA_BYTE_6(n) (((n) & 0xff) << 8) +#define P2WI_DATA_BYTE_6_MASK P2WI_DATA_BYTE_6(0xff) +#define P2WI_DATA_BYTE_7(n) (((n) & 0xff) << 16) +#define P2WI_DATA_BYTE_7_MASK P2WI_DATA_BYTE_7(0xff) +#define P2WI_DATA_BYTE_8(n) (((n) & 0xff) << 24) +#define P2WI_DATA_BYTE_8_MASK P2WI_DATA_BYTE_8(0xff) + +#define P2WI_LINECTRL_SDA_CTRL_EN (0x1 << 0) +#define P2WI_LINECTRL_SDA_OUT_HIGH (0x1 << 1) +#define P2WI_LINECTRL_SCL_CTRL_EN (0x1 << 2) +#define P2WI_LINECTRL_SCL_OUT_HIGH (0x1 << 3) +#define P2WI_LINECTRL_SDA_STATE_HIGH (0x1 << 4) +#define P2WI_LINECTRL_SCL_STATE_HIGH (0x1 << 5) + +#define P2WI_PM_DEV_ADDR(n) (((n) & 0xff) << 0) +#define P2WI_PM_DEV_ADDR_MASK P2WI_PM_DEV_ADDR(0xff) +#define P2WI_PM_CTRL_ADDR(n) (((n) & 0xff) << 8) +#define P2WI_PM_CTRL_ADDR_MASK P2WI_PM_CTRL_ADDR(0xff) +#define P2WI_PM_INIT_DATA(n) (((n) & 0xff) << 16) +#define P2WI_PM_INIT_DATA_MASK P2WI_PM_INIT_DATA(0xff) +#define P2WI_PM_INIT_SEND (0x1 << 31) + +struct sunxi_p2wi_reg { + u32 ctrl; /* 0x00 control */ + u32 cc; /* 0x04 clock control */ + u32 irq; /* 0x08 interrupt */ + u32 status; /* 0x0c status */ + u32 dataddr0; /* 0x10 data address 0 */ + u32 dataddr1; /* 0x14 data address 1 */ + u32 numbytes; /* 0x18 num bytes */ + u32 data0; /* 0x1c data buffer 0 */ + u32 data1; /* 0x20 data buffer 1 */ + u32 linectrl; /* 0x24 line control */ + u32 pm; /* 0x28 power management */ +}; + +void p2wi_init(void); +int p2wi_change_to_p2wi_mode(u8 slave_addr, u8 ctrl_reg, u8 init_data); +int p2wi_read(const u8 addr, u8 *data); +int p2wi_write(const u8 addr, u8 data); + +#endif /* _SUNXI_P2WI_H */