diff options
Diffstat (limited to 'arch/arm/mach-sunxi/rsb.c')
| -rw-r--r-- | arch/arm/mach-sunxi/rsb.c | 175 |
1 files changed, 0 insertions, 175 deletions
diff --git a/arch/arm/mach-sunxi/rsb.c b/arch/arm/mach-sunxi/rsb.c deleted file mode 100644 index 01bb09b7478..00000000000 --- a/arch/arm/mach-sunxi/rsb.c +++ /dev/null @@ -1,175 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0+ -/* - * (C) Copyright 2014 Hans de Goede <hdegoede@redhat.com> - * - * Based on allwinner u-boot sources rsb code which is: - * (C) Copyright 2007-2013 - * Allwinner Technology Co., Ltd. <www.allwinnertech.com> - * lixiang <lixiang@allwinnertech.com> - */ - -#include <common.h> -#include <errno.h> -#include <time.h> -#include <asm/arch/cpu.h> -#include <asm/arch/gpio.h> -#include <asm/arch/prcm.h> -#include <asm/arch/rsb.h> - -static int rsb_set_device_mode(void); - -static void rsb_cfg_io(void) -{ -#ifdef CONFIG_MACH_SUN8I - sunxi_gpio_set_cfgpin(SUNXI_GPL(0), SUN8I_GPL_R_RSB); - sunxi_gpio_set_cfgpin(SUNXI_GPL(1), SUN8I_GPL_R_RSB); - sunxi_gpio_set_pull(SUNXI_GPL(0), 1); - sunxi_gpio_set_pull(SUNXI_GPL(1), 1); - sunxi_gpio_set_drv(SUNXI_GPL(0), 2); - sunxi_gpio_set_drv(SUNXI_GPL(1), 2); -#elif defined CONFIG_MACH_SUN9I - sunxi_gpio_set_cfgpin(SUNXI_GPN(0), SUN9I_GPN_R_RSB); - sunxi_gpio_set_cfgpin(SUNXI_GPN(1), SUN9I_GPN_R_RSB); - sunxi_gpio_set_pull(SUNXI_GPN(0), 1); - sunxi_gpio_set_pull(SUNXI_GPN(1), 1); - sunxi_gpio_set_drv(SUNXI_GPN(0), 2); - sunxi_gpio_set_drv(SUNXI_GPN(1), 2); -#else -#error unsupported MACH_SUNXI -#endif -} - -static void rsb_set_clk(void) -{ - struct sunxi_rsb_reg * const rsb = - (struct sunxi_rsb_reg *)SUNXI_RSB_BASE; - u32 div = 0; - u32 cd_odly = 0; - - /* Source is Hosc24M, set RSB clk to 3Mhz */ - div = 24000000 / 3000000 / 2 - 1; - cd_odly = div >> 1; - if (!cd_odly) - cd_odly = 1; - - writel((cd_odly << 8) | div, &rsb->ccr); -} - -int rsb_init(void) -{ - struct sunxi_rsb_reg * const rsb = - (struct sunxi_rsb_reg *)SUNXI_RSB_BASE; - - /* Enable RSB and PIO clk, and de-assert their resets */ - prcm_apb0_enable(PRCM_APB0_GATE_PIO | PRCM_APB0_GATE_RSB); - - /* Setup external pins */ - rsb_cfg_io(); - - writel(RSB_CTRL_SOFT_RST, &rsb->ctrl); - rsb_set_clk(); - - return rsb_set_device_mode(); -} - -static int rsb_await_trans(void) -{ - struct sunxi_rsb_reg * const rsb = - (struct sunxi_rsb_reg *)SUNXI_RSB_BASE; - unsigned long tmo = timer_get_us() + 1000000; - u32 stat; - int ret; - - while (1) { - stat = readl(&rsb->stat); - if (stat & RSB_STAT_LBSY_INT) { - ret = -EBUSY; - break; - } - if (stat & RSB_STAT_TERR_INT) { - ret = -EIO; - break; - } - if (stat & RSB_STAT_TOVER_INT) { - ret = 0; - break; - } - if (timer_get_us() > tmo) { - ret = -ETIME; - break; - } - } - writel(stat, &rsb->stat); /* Clear status bits */ - - return ret; -} - -static int rsb_set_device_mode(void) -{ - struct sunxi_rsb_reg * const rsb = - (struct sunxi_rsb_reg *)SUNXI_RSB_BASE; - unsigned long tmo = timer_get_us() + 1000000; - - writel(RSB_DMCR_DEVICE_MODE_START | RSB_DMCR_DEVICE_MODE_DATA, - &rsb->dmcr); - - while (readl(&rsb->dmcr) & RSB_DMCR_DEVICE_MODE_START) { - if (timer_get_us() > tmo) - return -ETIME; - } - - return rsb_await_trans(); -} - -static int rsb_do_trans(void) -{ - struct sunxi_rsb_reg * const rsb = - (struct sunxi_rsb_reg *)SUNXI_RSB_BASE; - - setbits_le32(&rsb->ctrl, RSB_CTRL_START_TRANS); - return rsb_await_trans(); -} - -int rsb_set_device_address(u16 device_addr, u16 runtime_addr) -{ - struct sunxi_rsb_reg * const rsb = - (struct sunxi_rsb_reg *)SUNXI_RSB_BASE; - - writel(RSB_DEVADDR_RUNTIME_ADDR(runtime_addr) | - RSB_DEVADDR_DEVICE_ADDR(device_addr), &rsb->devaddr); - writel(RSB_CMD_SET_RTSADDR, &rsb->cmd); - - return rsb_do_trans(); -} - -int rsb_write(const u16 runtime_device_addr, const u8 reg_addr, u8 data) -{ - struct sunxi_rsb_reg * const rsb = - (struct sunxi_rsb_reg *)SUNXI_RSB_BASE; - - writel(RSB_DEVADDR_RUNTIME_ADDR(runtime_device_addr), &rsb->devaddr); - writel(reg_addr, &rsb->addr); - writel(data, &rsb->data); - writel(RSB_CMD_BYTE_WRITE, &rsb->cmd); - - return rsb_do_trans(); -} - -int rsb_read(const u16 runtime_device_addr, const u8 reg_addr, u8 *data) -{ - struct sunxi_rsb_reg * const rsb = - (struct sunxi_rsb_reg *)SUNXI_RSB_BASE; - int ret; - - writel(RSB_DEVADDR_RUNTIME_ADDR(runtime_device_addr), &rsb->devaddr); - writel(reg_addr, &rsb->addr); - writel(RSB_CMD_BYTE_READ, &rsb->cmd); - - ret = rsb_do_trans(); - if (ret) - return ret; - - *data = readl(&rsb->data) & 0xff; - - return 0; -} |