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clk: stm32f7: add STM32F4 support

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STM32F4 and STM32F7 RCC clock IP are very similar.
Same driver can be used to managed RCC clock for
these 2 SoCs.

Differences between STM32F4 and F7 will be managed using
different compatible string :
 _ overdrive clock is only supported by STM32F7
 _ different sys_pll_psc parameters can be used between STM32F4
   and STM32F7.

Signed-off-by: Patrice Chotard <patrice.chotard@st.com>
Reviewed-by: Vikas Manocha <vikas.manocha@st.com>
This commit is contained in:
Patrice Chotard 2017-11-15 13:14:47 +01:00 • committed by Tom Rini
parent 1555903c8d
commit f9333c93c8
1 changed files with 65 additions and 42 deletions
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107
drivers/clk/clk_stm32f7.c
View file

@ -81,37 +81,51 @@ struct pll_psc {
#define APB_PSC_8 0x6
#define APB_PSC_16 0x7
struct stm32_clk_info {
struct pll_psc sys_pll_psc;
bool has_overdrive;
};
struct stm32_clk_info stm32f4_clk_info = {
/* 180 MHz */
.sys_pll_psc = {
.pll_m = 8,
.pll_n = 360,
.pll_p = 2,
.pll_q = 8,
.ahb_psc = AHB_PSC_1,
.apb1_psc = APB_PSC_4,
.apb2_psc = APB_PSC_2,
},
.has_overdrive = false,
};
struct stm32_clk_info stm32f7_clk_info = {
/* 200 MHz */
.sys_pll_psc = {
.pll_m = 25,
.pll_n = 400,
.pll_p = 2,
.pll_q = 8,
.ahb_psc = AHB_PSC_1,
.apb1_psc = APB_PSC_4,
.apb2_psc = APB_PSC_2,
},
.has_overdrive = true,
};
struct stm32_clk {
struct stm32_rcc_regs *base;
struct stm32_pwr_regs *pwr_regs;
struct stm32_clk_info *info;
};
#if !defined(CONFIG_STM32_HSE_HZ)
#error "CONFIG_STM32_HSE_HZ not defined!"
#else
#if (CONFIG_STM32_HSE_HZ == 25000000)
#if (CONFIG_SYS_CLK_FREQ == 200000000)
/* 200 MHz */
struct pll_psc sys_pll_psc = {
.pll_m = 25,
.pll_n = 400,
.pll_p = 2,
.pll_q = 8,
.ahb_psc = AHB_PSC_1,
.apb1_psc = APB_PSC_4,
.apb2_psc = APB_PSC_2
};
#endif
#else
#error "No PLL/Prescaler configuration for given CONFIG_STM32_HSE_HZ exists"
#endif
#endif
static int configure_clocks(struct udevice *dev)
{
struct stm32_clk *priv = dev_get_priv(dev);
struct stm32_rcc_regs *regs = priv->base;
struct stm32_pwr_regs *pwr = priv->pwr_regs;
struct pll_psc sys_pll_psc = priv->info->sys_pll_psc;
/* Reset RCC configuration */
setbits_le32(&regs->cr, RCC_CR_HSION);
@ -148,17 +162,23 @@ static int configure_clocks(struct udevice *dev)
while (!(readl(&regs->cr) & RCC_CR_PLLRDY))
;
/* Enable high performance mode, System frequency up to 200 MHz */
setbits_le32(&regs->apb1enr, RCC_APB1ENR_PWREN);
setbits_le32(&pwr->cr1, PWR_CR1_ODEN);
/* Infinite wait! */
while (!(readl(&pwr->csr1) & PWR_CSR1_ODRDY))
;
/* Enable the Over-drive switch */
setbits_le32(&pwr->cr1, PWR_CR1_ODSWEN);
/* Infinite wait! */
while (!(readl(&pwr->csr1) & PWR_CSR1_ODSWRDY))
;
if (priv->info->has_overdrive) {
/*
* Enable high performance mode
* System frequency up to 200 MHz
*/
setbits_le32(&pwr->cr1, PWR_CR1_ODEN);
/* Infinite wait! */
while (!(readl(&pwr->csr1) & PWR_CSR1_ODRDY))
;
/* Enable the Over-drive switch */
setbits_le32(&pwr->cr1, PWR_CR1_ODSWEN);
/* Infinite wait! */
while (!(readl(&pwr->csr1) & PWR_CSR1_ODSWRDY))
;
}
stm32_flash_latency_cfg(5);
clrbits_le32(&regs->cfgr, (RCC_CFGR_SW0 | RCC_CFGR_SW1));
@ -273,22 +293,25 @@ static int stm32_clk_probe(struct udevice *dev)
struct stm32_clk *priv = dev_get_priv(dev);
fdt_addr_t addr;
addr = devfdt_get_addr(dev);
addr = dev_read_addr(dev);
if (addr == FDT_ADDR_T_NONE)
return -EINVAL;
priv->base = (struct stm32_rcc_regs *)addr;
priv->info = (struct stm32_clk_info *)dev_get_driver_data(dev);
err = dev_read_phandle_with_args(dev, "st,syscfg", NULL, 0, 0,
&args);
if (err) {
debug("%s: can't find syscon device (%d)\n", __func__,
err);
return err;
if (priv->info->has_overdrive) {
err = dev_read_phandle_with_args(dev, "st,syscfg", NULL, 0, 0,
&args);
if (err) {
debug("%s: can't find syscon device (%d)\n", __func__,
err);
return err;
}
priv->pwr_regs = (struct stm32_pwr_regs *)ofnode_get_addr(args.node);
}
priv->pwr_regs = (struct stm32_pwr_regs *)ofnode_get_addr(args.node);
configure_clocks(dev);
return 0;
@ -318,8 +341,8 @@ static struct clk_ops stm32_clk_ops = {
};
static const struct udevice_id stm32_clk_ids[] = {
{ .compatible = "st,stm32f42xx-rcc"},
{ .compatible = "st,stm32f746-rcc"},
{ .compatible = "st,stm32f42xx-rcc", .data = (ulong)&stm32f4_clk_info},
{ .compatible = "st,stm32f746-rcc", .data = (ulong)&stm32f7_clk_info},
{}
};