i2c接口可以接哪些器件_单片机i2c接口

项目中I2C6所对应的gpio口为22和23

i2c接口可以接哪些器件_单片机i2c接口

由上表可以确定以下信息：

a) QUP ID：BLSP6

b) QUP BASE Addr：7AF6000

c) IRQ：300

d) src clk：clk_gcc_blsp2_qup2_i2c_apps_clk

1、高通在lk阶段已经存在I2C的初始化代码

路径：bootable/bootloader/lk/platform/msm_shard/i2c_qup.c

i2c接口可以接哪些器件_单片机i2c接口

在初始化代码中qup_blsp_i2c_init为i2c接口函数，其中调用了两个重要函数gpio_config_blsp_i2c和clock_config_blsp_i2c，分别用于i2c的gpio和时钟clock的设置，BLSP_QUP_IRQ这个宏用来给中断号赋值。

2、添加中断号定义代码：

diff –git a/platform/msm8952/include/platform/irqs.h b/platform/msm8952/include/platform/irqs.h index 59408bd87..388be802a 100644 — a/platform/msm8952/include/platform/irqs.h +++ b/platform/msm8952/include/platform/irqs.h @@ -60,6 +60,7 @@ #define NR_IRQS (NR_MSM_IRQS + NR_GPIO_IRQS + \ NR_BOARD_IRQS) – +//#define BLSP_QUP_IRQ(blsp_id, qup_id) (GIC_SPI_START + 101 + qup_id) +#define BLSP_QUP_IRQ(blsp_id, qup_id) (GIC_SPI_START + 95 + (blsp_id-1)*204 + qup_id) #define SMD_IRQ (GIC_SPI_START + 168) #endif /* __IRQS_MSM8952_H */

其中GIC_SPI_START为一个偏移量，blsp_id为2，qup_id为1，即中断号为300

3、I2C初始化时调用gpio和时钟的配置函数添加如下

gpio设置文件添加函数代码：

diff –git a/platform/msm8952/gpio.c b/platform/msm8952/gpio.c old mode 100644 new mode 100755 index 05b4977ec..72a3f6919 — a/platform/msm8952/gpio.c +++ b/platform/msm8952/gpio.c @@ -70,3 +70,46 @@ void gpio_config_uart_dm(uint8_t id) gpio_tlmm_config(4, 2, GPIO_OUTPUT, GPIO_NO_PULL, GPIO_8MA, GPIO_DISABLE); } +void gpio_config_blsp_i2c(uint8_t blsp_id, uint8_t qup_id) +{ + if(blsp_id == BLSP_ID_1) { + switch (qup_id) { + case QUP_ID_1: + /* configure I2C SDA gpio */ + gpio_tlmm_config(6, 3, GPIO_OUTPUT, GPIO_NO_PULL, + GPIO_8MA, GPIO_DISABLE); + + /* configure I2C SCL gpio */ + gpio_tlmm_config(7, 3, GPIO_OUTPUT, GPIO_NO_PULL, + GPIO_8MA, GPIO_DISABLE); + break; + case QUP_ID_3: + /* configure I2C SDA gpio */ + gpio_tlmm_config(14, 2, GPIO_OUTPUT, GPIO_NO_PULL, + GPIO_8MA, GPIO_DISABLE); + + /* configure I2C SCL gpio */ + gpio_tlmm_config(15, 2, GPIO_OUTPUT, GPIO_NO_PULL, + GPIO_8MA, GPIO_DISABLE); + break; + default: + dprintf(CRITICAL, “Incorrect QUP id %d\n”,qup_id); + ASSERT(0); + } + } else if (blsp_id == BLSP_ID_2){ + switch (qup_id) { + case QUP_ID_1: + gpio_tlmm_config(22, 3, GPIO_OUTPUT, GPIO_NO_PULL, + GPIO_8MA, GPIO_DISABLE); + gpio_tlmm_config(23, 3, GPIO_OUTPUT, GPIO_NO_PULL, + GPIO_8MA, GPIO_DISABLE); + break; + default: + dprintf(CRITICAL, “Incorrect QUP id %d\n”,qup_id); + ASSERT(0); + } + } else { + dprintf(CRITICAL, “Incorrect BLSP id %d\n”,blsp_id); + ASSERT(0); + } +} \ No newline at end of file

diff –git a/platform/msm8952/include/platform/gpio.h b/platform/msm8952/include/platform/gpio.h index b4d12e818..4d4dcd1cf 100644 — a/platform/msm8952/include/platform/gpio.h +++ b/platform/msm8952/include/platform/gpio.h @@ -69,4 +69,5 @@ void gpio_tlmm_config(uint32_t gpio, uint8_t pull, uint8_t drvstr, uint32_t enable); +void gpio_config_blsp_i2c(uint8_t blsp_id, uint8_t qup_id); #endif

时钟设置文件添加函数代码：

diff –git a/platform/msm8952/acpuclock.c b/platform/msm8952/acpuclock.c old mode 100644 new mode 100755 index 9efe09b4f..7c9315ba2 — a/platform/msm8952/acpuclock.c +++ b/platform/msm8952/acpuclock.c @@ -34,6 +34,7 @@ #include #include #include +#include #include #define MAX_LOOPS 500 @@ -507,3 +508,86 @@ void clock_config_ce(uint8_t instance) clock_ce_enable(instance); } +void clock_config_blsp_i2c(uint8_t blsp_id, uint8_t qup_id) +{ + uint8_t ret = 0; + char clk_name[64]; + + struct clk *qup_clk; + + if(((qup_id != QUP_ID_1) && (qup_id != QUP_ID_3))) { + dprintf(CRITICAL, “Incorrect BLSP-%d or QUP-%d configuration\n”, blsp_id, qup_id); + ASSERT(0); + } + if(blsp_id == BLSP_ID_1){ + if (qup_id == QUP_ID_1) { + snprintf(clk_name, sizeof(clk_name), “blsp1_qup2_ahb_iface_clk”); + } + else if (qup_id == QUP_ID_3) { + snprintf(clk_name, sizeof(clk_name), “blsp1_qup4_ahb_iface_clk”); + } + + ret = clk_get_set_enable(clk_name, 0 , 1); + + if (ret) { + dprintf(CRITICAL, “Failed to enable %s clock\n”, clk_name); + return; + } + + if (qup_id == QUP_ID_1) { + snprintf(clk_name, sizeof(clk_name), “gcc_blsp1_qup2_i2c_apps_clk”); + } + else if (qup_id == QUP_ID_3) { + snprintf(clk_name, sizeof(clk_name), “gcc_blsp1_qup4_i2c_apps_clk”); + } + + qup_clk = clk_get(clk_name); + + if (!qup_clk) { + dprintf(CRITICAL, “Failed to get %s\n”, clk_name); + return; + } + + ret = clk_enable(qup_clk); + + if (ret) { + dprintf(CRITICAL, “Failed to enable %s\n”, clk_name); + return; + } + } else if (blsp_id == BLSP_ID_2){ + if (qup_id == QUP_ID_1) { + snprintf(clk_name, sizeof(clk_name), “blsp2_qup2_ahb_iface_clk”); + } + else if (qup_id == QUP_ID_3) { + snprintf(clk_name, sizeof(clk_name), “blsp2_qup4_ahb_iface_clk”); + } + + ret = clk_get_set_enable(clk_name, 0 , 1); + + if (ret) { + dprintf(CRITICAL, “Failed to enable %s clock\n”, clk_name); + return; + } + + if (qup_id == QUP_ID_1) { + snprintf(clk_name, sizeof(clk_name), “gcc_blsp2_qup2_i2c_apps_clk”); + } + else if (qup_id == QUP_ID_3) { + snprintf(clk_name, sizeof(clk_name), “gcc_blsp2_qup4_i2c_apps_clk”); + } + + qup_clk = clk_get(clk_name); + + if (!qup_clk) { + dprintf(CRITICAL, “Failed to get %s\n”, clk_name); + return; + } + + ret = clk_enable(qup_clk); + + if (ret) { + dprintf(CRITICAL, “Failed to enable %s\n”, clk_name); + return; + } + } +} diff –git a/platform/msm8952/include/platform/clock.h b/platform/msm8952/include/platform/clock.h index e6734cb27..cbd1ba46f 100644 — a/platform/msm8952/include/platform/clock.h +++ b/platform/msm8952/include/platform/clock.h @@ -99,4 +99,5 @@ void gcc_dsi_hs_clocks_enable(uint32_t flags, bool use_dsi1_pll, uint8_t pclk0_ uint8_t pclk0_n, uint8_t pclk0_d); void gcc_dsi_lp_clock_enable(uint32_t flags); void gcc_dsi_clocks_disable(uint32_t flags); +void clock_config_blsp_i2c(uint8_t blsp_id, uint8_t qup_id); #endif 添加时钟的配置及序列，主要添加三个与时钟相关结构体

diff –git a/platform/msm8952/msm8952-clock.c b/platform/msm8952/msm8952-clock.c old mode 100644 new mode 100755 index 85d506987..f9bebfe9f — a/platform/msm8952/msm8952-clock.c +++ b/platform/msm8952/msm8952-clock.c @@ -206,6 +206,19 @@ static struct rcg_clk sdcc1_apps_clk_src = }, }; +/* BLSP2_QUP2 Clocks */ +static struct clk_freq_tbl ftbl_gcc_blsp1_qup2_i2c_apps_clk_src[] = +{ + F(96000,cxo,10,1,2), + F(4800000,cxo,4,0,0), + F(9600000,cxo,2,0,0), + F(16000000,gpll0,10,1,5), + F(19200000,gpll0,1,0,0), + F(25000000,gpll0,16,1,2), + F(50000000,gpll0,16,0,0), + F_END +}; + static struct branch_clk gcc_sdcc1_apps_clk = { .cbcr_reg = (uint32_t *) SDCC1_APPS_CBCR, @@ -594,6 +607,37 @@ static struct vote_clk gcc_ce1_axi_clk = { }, }; +static struct vote_clk gcc_blsp2_ahb_clk = { + .cbcr_reg = (uint32_t *) BLSP2_AHB_CBCR, + .vote_reg = (uint32_t *) APCS_CLOCK_BRANCH_ENA_VOTE, + .en_mask = BIT(20), + + .c = { + .dbg_name = “gcc_blsp2_ahb_clk”, + .ops = &clk_ops_vote, + }, +}; +static struct rcg_clk gcc_blsp2_qup2_i2c_apps_clk_src = +{ + .cmd_reg = (uint32_t *) GCC_BLSP2_QUP2_CMD_RCGR, + .cfg_reg = (uint32_t *) GCC_BLSP2_QUP2_CFG_RCGR, + .set_rate = clock_lib2_rcg_set_rate_hid, + .freq_tbl = ftbl_gcc_blsp1_qup2_i2c_apps_clk_src, + .current_freq = &rcg_dummy_freq, + .c = { + .dbg_name = “gcc_blsp2_qup2_i2c_apps_clk_src”, + .ops = &clk_ops_rcg, + }, +}; +static struct branch_clk gcc_blsp2_qup2_i2c_apps_clk = { + .cbcr_reg = (uint32_t *) GCC_BLSP2_QUP2_APPS_CBCR, + .parent = &gcc_blsp2_qup2_i2c_apps_clk_src.c, + .c = { + .dbg_name = “gcc_blsp2_qup2_i2c_apps_clk”, + .ops = &clk_ops_branch, + }, +}; +

在时钟查找列表中添加如下函数代码： /* Clock lookup table */ static struct clk_lookup msm_clocks_8952[] = { @@ -621,6 +665,9 @@ static struct clk_lookup msm_clocks_8952[] = CLK_LOOKUP(“ce1_axi_clk”, gcc_ce1_axi_clk.c), CLK_LOOKUP(“ce1_core_clk”, gcc_ce1_clk.c), CLK_LOOKUP(“ce1_src_clk”, ce1_clk_src.c), + CLK_LOOKUP(“blsp2_qup2_ahb_iface_clk”, gcc_blsp2_ahb_clk.c), + CLK_LOOKUP(“gcc_blsp2_qup2_i2c_apps_clk_src”, gcc_blsp2_qup2_i2c_apps_clk_src.c), + CLK_LOOKUP(“gcc_blsp2_qup2_i2c_apps_clk”, gcc_blsp2_qup2_i2c_apps_clk.c), }; void msm8956_clock_override() diff –git a/platform/msm_shared/rules.mk b/platform/msm_shared/rules.mk index c64acf027..57f833189 100755 — a/platform/msm_shared/rules.mk +++ b/platform/msm_shared/rules.mk @@ -634,6 +634,7 @@ DEFINES += DISPLAY_NONE_LK_MENU=1 (LOCAL_DIR)/crypto_hash.o \ (LOCAL_DIR)/crypto5_eng.o \ (LOCAL_DIR)/crypto5_wrapper.o \ + (LOCAL_DIR)/i2c_qup.o \ (LOCAL_DIR)/mdp5.o \ (LOCAL_DIR)/display.o \

配置I2C的时钟参数：

diff –git a/platform/msm8952/include/platform/iomap.h b/platform/msm8952/include/platform/iomap.h old mode 100644 new mode 100755 index 057d909f2..3e016fcff — a/platform/msm8952/include/platform/iomap.h +++ b/platform/msm8952/include/platform/iomap.h @@ -101,6 +101,15 @@ #define GCC_CRYPTO_CBCR (CLK_CTL_BASE + 0x1601C) #define GCC_CRYPTO_AXI_CBCR (CLK_CTL_BASE + 0x16020) #define GCC_CRYPTO_AHB_CBCR (CLK_CTL_BASE + 0x16024) +#define BLSP_QUP_BASE(blsp_id, qup_id) ((blsp_id == 1) ? (PERIPH_SS_BASE + 0xB5000 \ + + (qup_id * 0x1000)) :\ + (PERIPH_SS_BASE + 0x2f5000 + \ + (qup_id * 0x1000))) + +#define BLSP2_AHB_CBCR (CLK_CTL_BASE + 0xB008) //0x0B008 +#define GCC_BLSP2_QUP2_APPS_CBCR (CLK_CTL_BASE + 0xD010) +#define GCC_BLSP2_QUP2_CFG_RCGR (CLK_CTL_BASE + 0xD004) +#define GCC_BLSP2_QUP2_CMD_RCGR (CLK_CTL_BASE + 0xD000)

4、添加I2C测试程序

diff –git a/app/aboot/aboot.c b/app/aboot/aboot.c index 16717dee5..87375893e 100755 — a/app/aboot/aboot.c +++ b/app/aboot/aboot.c @@ -95,6 +95,12 @@ #include #include #include “fastboot_test.h” +#include +#include +#include +#include +#include +#include extern bool target_use_signed_kernel(void); extern void platform_uninit(void); @@ -326,6 +332,8 @@ struct getvar_partition_info { #define EXT_MAGIC_OFFSET_SB 0x38 #define F2FS_MAGIC 0xF2F52010 // F2FS Magic Number #define F2FS_MAGIC_OFFSET_SB 0x0 +#define EXTERNCHG_SLAVE_ADDR 0x3b +#define EXTERNCHG_I2C_VOLTAGE 0x08 typedef enum fs_signature_type { EXT_FS_SIGNATURE = 1, @@ -372,6 +380,79 @@ extern int emmc_recovery_init(void); extern int fastboot_trigger(void); #endif +static struct qup_i2c_dev *i2c_dev; +int externchg_lk_i2c_read(uint8_t addr, uint8_t *reg, uint8_t *buf, uint8_t len) +{ + if (!buf) + return ERR_INVALID_ARGS; + if(!i2c_dev) + return ERR_NOT_VALID; + struct i2c_msg rd_buf[] = { + {addr, I2C_M_WR, 1, reg}, + {addr, I2C_M_RD, len, buf} + }; + dprintf(CRITICAL, “#### qup_i2c_xfer\n”); + int err = qup_i2c_xfer(i2c_dev, rd_buf, 2); + + if (err < 0) { + dprintf(CRITICAL, “Read reg %x failed err %d\n”, *reg,err); + return err; + } + return NO_ERROR; +} + +int externchg_lk_adapter_present(void) +{ + unsigned char buf; + unsigned char register_addr = EXTERNCHG_I2C_VOLTAGE; + unsigned char slave_addr = EXTERNCHG_SLAVE_ADDR; + int ret=-1; + + if(!i2c_dev) { + return ERR_NOT_VALID; + } + ret = externchg_lk_i2c_read(slave_addr, ®ister_addr, &buf, 1); + if(ret < 0) { + dprintf(CRITICAL, “read externchg adapter_present error\n”); + return ret; + } + dprintf(CRITICAL, “#### read reg[0x8]=%x\n”,buf); + return (buf && 0x04) ? 0 : -1; +} +int externchg_lk_read_voltage(void) +{ + return target_get_battery_voltage(); +} + +void check_low_batt_start_system(void){ + uint32_t is_batt_volt = 0; + uint32_t cutoff_volt = 3600000; + + i2c_dev = qup_blsp_i2c_init(BLSP_ID_2, QUP_ID_1, 100000, 19200000); + is_batt_volt = externchg_lk_read_voltage(); + if(is_batt_volt < cutoff_volt) { + dprintf(CRITICAL,”low battery(%d),forbidy boot\n”,is_batt_volt); + mdelay(20); + //display_image_on_screen(); + /* 判断有无充电器插入，有则进行预充电，没有则关机 + * externchg_lk_adapter_present(); + */ + if(!externchg_lk_adapter_present()){ + //充电IC初始化 + while(is_batt_volt < cutoff_volt){ + dprintf(CRITICAL, “charging: batt_volt =%d\n”,is_batt_volt); + mdelay(1000); + is_batt_volt = externchg_lk_read_voltage(); + } + }else { + shutdown_device(); + } + + }else{ + dprintf(CRITICAL,”not low-volt battery(%d)\n”,is_batt_volt); + } +} + void target_get_pmic_info(char *pmic_info) { dprintf(INFO, “PMIC 0 is %d\n”, board_pmic_target(0)); @@ -632,8 +713,9 @@ unsigned char *update_cmdline(const char * cmdline) cmdline_len += strlen(loglevel); } else if (boot_reason_alarm) { cmdline_len += strlen(alarmboot_cmdline); – } else if ((target_build_variant_user() || device.charger_screen_enabled) – && target_pause_for_battery_charge() && !boot_into_recovery) { + } else if (!externchg_lk_adapter_present()){ + //} else if ((target_build_variant_user() || device.charger_screen_enabled) + // && target_pause_for_battery_charge() && !boot_into_recovery) { pause_at_bootup = 1; cmdline_len += strlen(battchg_pause); } @@ -964,6 +1046,7 @@ unsigned char *update_cmdline(const char * cmdline) if (have_cmdline) –dst; while ((*dst++ = *src++)); } else if (pause_at_bootup) { + dprintf(INFO, “#### enter poweroff `charger\n”); src = battchg_pause; if (have_cmdline) –dst; while ((*dst++ = *src++)); @@ -5427,6 +5510,7 @@ retry_boot: goto fastboot; } + check_low_batt_start_system(); boot_err_type = boot_linux_from_mmc(); switch (boot_err_type) {

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