[PATCH v4 07/14] clk: stm32mp13: manage secured clocks

gabriel.fernandez
2022-05-16T07:07:55Z

Don't register a clock if this clock is secured.

Signed-off-by: Gabriel Fernandez <gabriel.fernandez@foss.st.com>
---
drivers/clk/stm32/clk-stm32-core.c | 4 +
drivers/clk/stm32/clk-stm32-core.h | 22 +++--
drivers/clk/stm32/clk-stm32mp13.c | 152 ++++++++++++++++++++++++++++-
3 files changed, 164 insertions(+), 14 deletions(-)

diff --git a/drivers/clk/stm32/clk-stm32-core.c b/drivers/clk/stm32/clk-stm32-core.c
index 69e40c152d2f..70014c15d15f 100644
--- a/drivers/clk/stm32/clk-stm32-core.c
+++ b/drivers/clk/stm32/clk-stm32-core.c
@@ -46,6 +46,10 @@ static int stm32_rcc_clock_init(struct device *dev,
const struct clock_config *cfg_clock = &data->tab_clocks[n];
struct clk_hw *hw = ERR_PTR(-ENOENT);

+ if (data->check_security &&
+ data->check_security(base, cfg_clock))
+ continue;
+
if (cfg_clock->func)
hw = (*cfg_clock->func)(dev, data, base, &rlock,
cfg_clock);
diff --git a/drivers/clk/stm32/clk-stm32-core.h b/drivers/clk/stm32/clk-stm32-core.h
index 6c5c8c08ecbf..5f4c81cce170 100644
--- a/drivers/clk/stm32/clk-stm32-core.h
+++ b/drivers/clk/stm32/clk-stm32-core.h
@@ -46,6 +46,7 @@ struct stm32_composite_cfg {

struct clock_config {
unsigned long id;
+ int sec_id;
void *clock_cfg;

struct clk_hw *(*func)(struct device *dev,
@@ -69,6 +70,8 @@ struct stm32_rcc_match_data {
unsigned int maxbinding;
struct clk_stm32_clock_data *clock_data;
u32 clear_offset;
+ int (*check_security)(void __iomem *base,
+ const struct clock_config *cfg);
};

int stm32_rcc_reset_init(struct device *dev, const struct of_device_id *match,
@@ -157,25 +160,26 @@ struct clk_hw *clk_stm32_composite_register(struct device *dev,
spinlock_t *lock,
const struct clock_config *cfg);

-#define STM32_CLOCK_CFG(_binding, _clk, _struct, _register)\
+#define STM32_CLOCK_CFG(_binding, _clk, _sec_id, _struct, _register)\
{\
.id = (_binding),\
+ .sec_id = (_sec_id),\
.clock_cfg = (_struct) {_clk},\
.func = (_register),\
}

-#define STM32_MUX_CFG(_binding, _clk)\
- STM32_CLOCK_CFG(_binding, &(_clk), struct clk_stm32_mux *,\
+#define STM32_MUX_CFG(_binding, _clk, _sec_id)\
+ STM32_CLOCK_CFG(_binding, &(_clk), _sec_id, struct clk_stm32_mux *,\
&clk_stm32_mux_register)

-#define STM32_GATE_CFG(_binding, _clk)\
- STM32_CLOCK_CFG(_binding, &(_clk), struct clk_stm32_gate *,\
+#define STM32_GATE_CFG(_binding, _clk, _sec_id)\
+ STM32_CLOCK_CFG(_binding, &(_clk), _sec_id, struct clk_stm32_gate *,\
&clk_stm32_gate_register)

-#define STM32_DIV_CFG(_binding, _clk)\
- STM32_CLOCK_CFG(_binding, &(_clk), struct clk_stm32_div *,\
+#define STM32_DIV_CFG(_binding, _clk, _sec_id)\
+ STM32_CLOCK_CFG(_binding, &(_clk), _sec_id, struct clk_stm32_div *,\
&clk_stm32_div_register)

-#define STM32_COMPOSITE_CFG(_binding, _clk)\
- STM32_CLOCK_CFG(_binding, &(_clk), struct clk_stm32_composite *,\
+#define STM32_COMPOSITE_CFG(_binding, _clk, _sec_id)\
+ STM32_CLOCK_CFG(_binding, &(_clk), _sec_id, struct clk_stm32_composite *,\
&clk_stm32_composite_register)
diff --git a/drivers/clk/stm32/clk-stm32mp13.c b/drivers/clk/stm32/clk-stm32mp13.c
index af9518a0d262..7c5ae2dada4a 100644
--- a/drivers/clk/stm32/clk-stm32mp13.c
+++ b/drivers/clk/stm32/clk-stm32mp13.c
@@ -400,6 +400,131 @@ static const struct stm32_mux_cfg stm32mp13_muxes[] = {
CFG_MUX(MUX_SDMMC2, RCC_SDMMC12CKSELR, 3, 3),
};

+struct clk_stm32_securiy {
+ u32 offset;
+ u8 bit_idx;
+ unsigned long scmi_id;
+};
+
+enum security_clk {
+ SECF_NONE,
+ SECF_LPTIM2,
+ SECF_LPTIM3,
+ SECF_VREF,
+ SECF_DCMIPP,
+ SECF_USBPHY,
+ SECF_TZC,
+ SECF_ETZPC,
+ SECF_IWDG1,
+ SECF_BSEC,
+ SECF_STGENC,
+ SECF_STGENRO,
+ SECF_USART1,
+ SECF_USART2,
+ SECF_SPI4,
+ SECF_SPI5,
+ SECF_I2C3,
+ SECF_I2C4,
+ SECF_I2C5,
+ SECF_TIM12,
+ SECF_TIM13,
+ SECF_TIM14,
+ SECF_TIM15,
+ SECF_TIM16,
+ SECF_TIM17,
+ SECF_DMA3,
+ SECF_DMAMUX2,
+ SECF_ADC1,
+ SECF_ADC2,
+ SECF_USBO,
+ SECF_TSC,
+ SECF_PKA,
+ SECF_SAES,
+ SECF_CRYP1,
+ SECF_HASH1,
+ SECF_RNG1,
+ SECF_BKPSRAM,
+ SECF_MCE,
+ SECF_FMC,
+ SECF_QSPI,
+ SECF_SDMMC1,
+ SECF_SDMMC2,
+ SECF_ETH1CK,
+ SECF_ETH1TX,
+ SECF_ETH1RX,
+ SECF_ETH1MAC,
+ SECF_ETH1STP,
+ SECF_ETH2CK,
+ SECF_ETH2TX,
+ SECF_ETH2RX,
+ SECF_ETH2MAC,
+ SECF_ETH2STP,
+ SECF_MCO1,
+ SECF_MCO2
+};
+
+#define SECF(_sec_id, _offset, _bit_idx)[_sec_id] = {\
+ .offset = _offset,\
+ .bit_idx = _bit_idx,\
+ .scmi_id = -1,\
+}
+
+static const struct clk_stm32_securiy stm32mp13_security[] = {
+ SECF(SECF_LPTIM2, RCC_APB3SECSR, RCC_APB3SECSR_LPTIM2SECF),
+ SECF(SECF_LPTIM3, RCC_APB3SECSR, RCC_APB3SECSR_LPTIM3SECF),
+ SECF(SECF_VREF, RCC_APB3SECSR, RCC_APB3SECSR_VREFSECF),
+ SECF(SECF_DCMIPP, RCC_APB4SECSR, RCC_APB4SECSR_DCMIPPSECF),
+ SECF(SECF_USBPHY, RCC_APB4SECSR, RCC_APB4SECSR_USBPHYSECF),
+ SECF(SECF_TZC, RCC_APB5SECSR, RCC_APB5SECSR_TZCSECF),
+ SECF(SECF_ETZPC, RCC_APB5SECSR, RCC_APB5SECSR_ETZPCSECF),
+ SECF(SECF_IWDG1, RCC_APB5SECSR, RCC_APB5SECSR_IWDG1SECF),
+ SECF(SECF_BSEC, RCC_APB5SECSR, RCC_APB5SECSR_BSECSECF),
+ SECF(SECF_STGENC, RCC_APB5SECSR, RCC_APB5SECSR_STGENCSECF),
+ SECF(SECF_STGENRO, RCC_APB5SECSR, RCC_APB5SECSR_STGENROSECF),
+ SECF(SECF_USART1, RCC_APB6SECSR, RCC_APB6SECSR_USART1SECF),
+ SECF(SECF_USART2, RCC_APB6SECSR, RCC_APB6SECSR_USART2SECF),
+ SECF(SECF_SPI4, RCC_APB6SECSR, RCC_APB6SECSR_SPI4SECF),
+ SECF(SECF_SPI5, RCC_APB6SECSR, RCC_APB6SECSR_SPI5SECF),
+ SECF(SECF_I2C3, RCC_APB6SECSR, RCC_APB6SECSR_I2C3SECF),
+ SECF(SECF_I2C4, RCC_APB6SECSR, RCC_APB6SECSR_I2C4SECF),
+ SECF(SECF_I2C5, RCC_APB6SECSR, RCC_APB6SECSR_I2C5SECF),
+ SECF(SECF_TIM12, RCC_APB6SECSR, RCC_APB6SECSR_TIM12SECF),
+ SECF(SECF_TIM13, RCC_APB6SECSR, RCC_APB6SECSR_TIM13SECF),
+ SECF(SECF_TIM14, RCC_APB6SECSR, RCC_APB6SECSR_TIM14SECF),
+ SECF(SECF_TIM15, RCC_APB6SECSR, RCC_APB6SECSR_TIM15SECF),
+ SECF(SECF_TIM16, RCC_APB6SECSR, RCC_APB6SECSR_TIM16SECF),
+ SECF(SECF_TIM17, RCC_APB6SECSR, RCC_APB6SECSR_TIM17SECF),
+ SECF(SECF_DMA3, RCC_AHB2SECSR, RCC_AHB2SECSR_DMA3SECF),
+ SECF(SECF_DMAMUX2, RCC_AHB2SECSR, RCC_AHB2SECSR_DMAMUX2SECF),
+ SECF(SECF_ADC1, RCC_AHB2SECSR, RCC_AHB2SECSR_ADC1SECF),
+ SECF(SECF_ADC2, RCC_AHB2SECSR, RCC_AHB2SECSR_ADC2SECF),
+ SECF(SECF_USBO, RCC_AHB2SECSR, RCC_AHB2SECSR_USBOSECF),
+ SECF(SECF_TSC, RCC_AHB4SECSR, RCC_AHB4SECSR_TSCSECF),
+ SECF(SECF_PKA, RCC_AHB5SECSR, RCC_AHB5SECSR_PKASECF),
+ SECF(SECF_SAES, RCC_AHB5SECSR, RCC_AHB5SECSR_SAESSECF),
+ SECF(SECF_CRYP1, RCC_AHB5SECSR, RCC_AHB5SECSR_CRYP1SECF),
+ SECF(SECF_HASH1, RCC_AHB5SECSR, RCC_AHB5SECSR_HASH1SECF),
+ SECF(SECF_RNG1, RCC_AHB5SECSR, RCC_AHB5SECSR_RNG1SECF),
+ SECF(SECF_BKPSRAM, RCC_AHB5SECSR, RCC_AHB5SECSR_BKPSRAMSECF),
+ SECF(SECF_MCE, RCC_AHB6SECSR, RCC_AHB6SECSR_MCESECF),
+ SECF(SECF_FMC, RCC_AHB6SECSR, RCC_AHB6SECSR_FMCSECF),
+ SECF(SECF_QSPI, RCC_AHB6SECSR, RCC_AHB6SECSR_QSPISECF),
+ SECF(SECF_SDMMC1, RCC_AHB6SECSR, RCC_AHB6SECSR_SDMMC1SECF),
+ SECF(SECF_SDMMC2, RCC_AHB6SECSR, RCC_AHB6SECSR_SDMMC2SECF),
+ SECF(SECF_ETH1CK, RCC_AHB6SECSR, RCC_AHB6SECSR_ETH1CKSECF),
+ SECF(SECF_ETH1TX, RCC_AHB6SECSR, RCC_AHB6SECSR_ETH1TXSECF),
+ SECF(SECF_ETH1RX, RCC_AHB6SECSR, RCC_AHB6SECSR_ETH1RXSECF),
+ SECF(SECF_ETH1MAC, RCC_AHB6SECSR, RCC_AHB6SECSR_ETH1MACSECF),
+ SECF(SECF_ETH1STP, RCC_AHB6SECSR, RCC_AHB6SECSR_ETH1STPSECF),
+ SECF(SECF_ETH2CK, RCC_AHB6SECSR, RCC_AHB6SECSR_ETH2CKSECF),
+ SECF(SECF_ETH2TX, RCC_AHB6SECSR, RCC_AHB6SECSR_ETH2TXSECF),
+ SECF(SECF_ETH2RX, RCC_AHB6SECSR, RCC_AHB6SECSR_ETH2RXSECF),
+ SECF(SECF_ETH2MAC, RCC_AHB6SECSR, RCC_AHB6SECSR_ETH2MACSECF),
+ SECF(SECF_ETH2STP, RCC_AHB6SECSR, RCC_AHB6SECSR_ETH2STPSECF),
+ SECF(SECF_MCO1, RCC_SECCFGR, RCC_SECCFGR_MCO1SEC),
+ SECF(SECF_MCO2, RCC_SECCFGR, RCC_SECCFGR_MCO2SEC),
+};
+
static const char * const eth12_src[] = {
"pll4_p", "pll3_q"
};
@@ -448,13 +573,29 @@ static struct clk_stm32_composite ck_mco2 = {
};

static const struct clock_config stm32mp13_clock_cfg[] = {
- STM32_MUX_CFG(NO_ID, ck_ker_eth1),
- STM32_GATE_CFG(ETH1CK_K, eth1ck_k),
- STM32_DIV_CFG(ETH1PTP_K, eth1ptp_k),
- STM32_COMPOSITE_CFG(CK_MCO1, ck_mco1),
- STM32_COMPOSITE_CFG(CK_MCO2, ck_mco2),
+ STM32_MUX_CFG(NO_ID, ck_ker_eth1, SECF_ETH1CK),
+ STM32_GATE_CFG(ETH1CK_K, eth1ck_k, SECF_ETH1CK),
+ STM32_DIV_CFG(ETH1PTP_K, eth1ptp_k, SECF_ETH1CK),
+ STM32_COMPOSITE_CFG(CK_MCO1, ck_mco1, SECF_MCO1),
+ STM32_COMPOSITE_CFG(CK_MCO2, ck_mco2, SECF_MCO2),
};

+static int stm32mp13_clock_is_provided_by_secure(void __iomem *base,
+ const struct clock_config *cfg)
+{
+ int sec_id = cfg->sec_id;
+
+ if (sec_id != SECF_NONE) {
+ const struct clk_stm32_securiy *secf;
+
+ secf = &stm32mp13_security[sec_id];
+
+ return !!(readl(base + secf->offset) & BIT(secf->bit_idx));
+ }
+
+ return 0;
+}
+
static u16 stm32mp13_cpt_gate[GATE_NB];

static struct clk_stm32_clock_data stm32mp13_clock_data = {
@@ -468,6 +609,7 @@ static const struct stm32_rcc_match_data stm32mp13_data = {
.tab_clocks = stm32mp13_clock_cfg,
.num_clocks = ARRAY_SIZE(stm32mp13_clock_cfg),
.clock_data = &stm32mp13_clock_data,
+ .check_security = &stm32mp13_clock_is_provided_by_secure,
.maxbinding = STM32MP1_LAST_CLK,
.clear_offset = RCC_CLR_OFFSET,
};
--
2.25.1