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From:   <gabriel.fernandez@foss.st.com>
To:     Michael Turquette <mturquette@baylibre.com>,
        Stephen Boyd <sboyd@kernel.org>,
        Rob Herring <robh+dt@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>,
        Maxime Coquelin <mcoquelin.stm32@gmail.com>,
        Alexandre Torgue <alexandre.torgue@foss.st.com>,
        Philipp Zabel <p.zabel@pengutronix.de>,
        Gabriel Fernandez <gabriel.fernandez@foss.st.com>
CC:     <linux-clk@vger.kernel.org>, <devicetree@vger.kernel.org>,
        <linux-stm32@st-md-mailman.stormreply.com>,
        <linux-arm-kernel@lists.infradead.org>,
        <linux-kernel@vger.kernel.org>
Subject: [PATCH v4 07/14] clk: stm32mp13: manage secured clocks
Date:   Mon, 16 May 2022 09:05:53 +0200
Message-ID: <20220516070600.7692-8-gabriel.fernandez@foss.st.com>
In-Reply-To: <20220516070600.7692-1-gabriel.fernandez@foss.st.com>
References: <20220516070600.7692-1-gabriel.fernandez@foss.st.com>
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From: Gabriel Fernandez <gabriel.fernandez@foss.st.com>

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