tls_gpio_write和tls_bitband_write分別適用於那種場合

tls_gpio_write操作了寫使能寄存器，但tls_bitband_write直接操作寫數據寄存器。
很明顯tls_bitband_write效率更高，但為什麼tls_gpio_write要這麼實現呢？

void tls_gpio_write(enum tls_io_name gpio_pin, u8 value)
{

u32 cpu_sr = 0;
u32 reg;
u32    reg_en;
u8  pin;
u16 offset;

if (gpio_pin >= WM_IO_PB_00)
{
    pin    = gpio_pin - WM_IO_PB_00;
    offset = TLS_IO_AB_OFFSET;
}
else
{
    pin    = gpio_pin;
    offset = 0;
}


cpu_sr = tls_os_set_critical();

reg_en = tls_reg_read32(HR_GPIO_DATA_EN + offset);
tls_reg_write32(HR_GPIO_DATA_EN + offset, reg_en | (1 << pin));

reg = tls_reg_read32(HR_GPIO_DATA + offset);
if(value)
    tls_reg_write32(HR_GPIO_DATA + offset, reg |  (1 << pin));    /* write high */
else
    tls_reg_write32(HR_GPIO_DATA + offset, reg & (~(1 << pin)));/* write low */

tls_reg_write32(HR_GPIO_DATA_EN + offset, reg_en);

tls_os_release_critical(cpu_sr);

}

static __inline void tls_bitband_write(volatile unsigned int addr, unsigned int bit, unsigned int val)
{

unsigned int temp;

temp = (M32(addr) & ~(1 << bit)) | (val << bit);

*((volatile unsigned int * )addr) = temp;

}

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