[PATCH v3 5/5] platform: generic: allwinner: add support for c9xx pmu
Heiko Stuebner
heiko at sntech.de
Thu Sep 8 06:42:42 PDT 2022
With the T-HEAD C9XX cores being designed before or during ratification
of the SSCOFPMF extension, they implement a PMU extension that behaves
very similar but not equal to it by providing overflow interrupts though
in a slightly different registers format.
The sun20i-d1 is using this core. So implement the necessary overrides
to allow its pmu to be used via the standard sbi-pmu extension.
For now it's also the only soc using this core, so keep the additional
code in the d1-space for now.
Signed-off-by: Heiko Stuebner <heiko at sntech.de>
---
platform/generic/allwinner/sun20i-d1.c | 76 +++++++++++++++
platform/generic/include/thead_c9xx.h | 127 +++++++++++++++++++++++++
2 files changed, 203 insertions(+)
create mode 100644 platform/generic/include/thead_c9xx.h
diff --git a/platform/generic/allwinner/sun20i-d1.c b/platform/generic/allwinner/sun20i-d1.c
index 5b2656c..55d58eb 100644
--- a/platform/generic/allwinner/sun20i-d1.c
+++ b/platform/generic/allwinner/sun20i-d1.c
@@ -5,11 +5,13 @@
*/
#include <platform_override.h>
+#include <thead_c9xx.h>
#include <sbi/riscv_io.h>
#include <sbi/sbi_bitops.h>
#include <sbi/sbi_ecall_interface.h>
#include <sbi/sbi_error.h>
#include <sbi/sbi_hsm.h>
+#include <sbi/sbi_pmu.h>
#include <sbi_utils/fdt/fdt_helper.h>
#include <sbi_utils/irqchip/fdt_irqchip_plic.h>
@@ -199,6 +201,79 @@ static int sun20i_d1_final_init(bool cold_boot, const struct fdt_match *match)
return 0;
}
+static int thead_c9xx_pmu_ctr_enable_irq_hw(int ctr_idx)
+{
+ unsigned long val;
+ unsigned long mip_val;
+
+ if (ctr_idx >= SBI_PMU_HW_CTR_MAX)
+ return SBI_EFAIL;
+
+ mip_val = csr_read(CSR_MIP);
+ /**
+ * Clear out the OF bit so that next interrupt can be enabled.
+ * This should be done only when the corresponding overflow interrupt
+ * bit is cleared. That indicates that software has already handled the
+ * previous interrupts or the hardware yet to set an overflow interrupt.
+ * Otherwise, there will be race conditions where we may clear the bit
+ * the software is yet to handle the interrupt.
+ */
+ if (!(mip_val & THEAD_C9XX_MIP_MOIP)) {
+ val = csr_read(THEAD_C9XX_CSR_MCOUNTEROF);
+ val &= ~(1 << ctr_idx);
+ csr_write(THEAD_C9XX_CSR_MCOUNTEROF, val);
+ }
+
+ /**
+ * SSCOFPMF uses the OF bit for enabling/disabling the interrupt,
+ * while the C9XX has designated enable bits.
+ * So enable per-counter interrupt on C9xx here.
+ */
+ val = csr_read(THEAD_C9XX_CSR_MCOUNTERINTEN);
+ val |= (1 << ctr_idx);
+ csr_write(THEAD_C9XX_CSR_MCOUNTERINTEN, val);
+
+ return 0;
+}
+
+static int thead_c9xx_pmu_ctr_enable_ovf(int ctr_idx)
+{
+ unsigned long val;
+
+ val = csr_read(THEAD_C9XX_CSR_MCOUNTERINTEN);
+ val &= ~(1 << ctr_idx);
+ csr_write(THEAD_C9XX_CSR_MCOUNTERINTEN, val);
+
+ return 0;
+}
+
+static int thead_c9xx_pmu_irq_bit(void)
+{
+ return THEAD_C9XX_MIP_MOIP;
+}
+
+static void thead_c9xx_pmu_counter_data(unsigned int *count,
+ unsigned int *bits)
+{
+ /* auto-detection doesn't work on t-head c9xx cores */
+ *count = 29;
+ *bits = 64;
+}
+
+struct sbi_pmu_platform_ops thead_c9xx_pmu_platform_ops = {
+ .ctr_enable_irq_hw = thead_c9xx_pmu_ctr_enable_irq_hw,
+ .ctr_enable_ovf = thead_c9xx_pmu_ctr_enable_ovf,
+ .irq_bit = thead_c9xx_pmu_irq_bit,
+ .counter_data = thead_c9xx_pmu_counter_data,
+};
+
+static int sun20i_d1_extensions_init(const struct fdt_match *match)
+{
+ sbi_pmu_set_platform_ops(&thead_c9xx_pmu_platform_ops);
+
+ return 0;
+}
+
static const struct fdt_match sun20i_d1_match[] = {
{ .compatible = "allwinner,sun20i-d1" },
{ },
@@ -207,4 +282,5 @@ static const struct fdt_match sun20i_d1_match[] = {
const struct platform_override sun20i_d1 = {
.match_table = sun20i_d1_match,
.final_init = sun20i_d1_final_init,
+ .extensions_init = sun20i_d1_extensions_init,
};
diff --git a/platform/generic/include/thead_c9xx.h b/platform/generic/include/thead_c9xx.h
new file mode 100644
index 0000000..bab0408
--- /dev/null
+++ b/platform/generic/include/thead_c9xx.h
@@ -0,0 +1,127 @@
+#ifndef __RISCV_THEAD_C9XX_H____
+#define __RISCV_THEAD_C9XX_H____
+
+/* T-HEAD C9xx M mode CSR. */
+#define THEAD_C9XX_CSR_MXSTATUS 0x7c0
+#define THEAD_C9XX_CSR_MHCR 0x7c1
+#define THEAD_C9XX_CSR_MCOR 0x7c2
+#define THEAD_C9XX_CSR_MCCR2 0x7c3
+#define THEAD_C9XX_CSR_MCER2 0x7c4
+#define THEAD_C9XX_CSR_MHINT 0x7c5
+#define THEAD_C9XX_CSR_MRMR 0x7c6
+#define THEAD_C9XX_CSR_MRVBR 0x7c7
+#define THEAD_C9XX_CSR_MCER 0x7c8
+#define THEAD_C9XX_CSR_MCOUNTERWEN 0x7c9
+#define THEAD_C9XX_CSR_MCOUNTERINTEN 0x7ca
+#define THEAD_C9XX_CSR_MCOUNTEROF 0x7cb
+#define THEAD_C9XX_CSR_MHINT2 0x7cc
+#define THEAD_C9XX_CSR_MHINT3 0x7cd
+#define THEAD_C9XX_CSR_MRADDR 0x7e0
+#define THEAD_C9XX_CSR_MEXSTATUS 0x7e1
+#define THEAD_C9XX_CSR_MNMICAUSE 0x7e2
+#define THEAD_C9XX_CSR_MNMIPC 0x7e3
+#define THEAD_C9XX_CSR_MHPMCR 0x7f0
+#define THEAD_C9XX_CSR_MHPMSR 0x7f1
+#define THEAD_C9XX_CSR_MHPMER 0x7f2
+#define THEAD_C9XX_CSR_MSMPR 0x7f3
+#define THEAD_C9XX_CSR_MTEECFG 0x7f4
+#define THEAD_C9XX_CSR_MZONEID 0x7f5
+#define THEAD_C9XX_CSR_ML2CPID 0x7f6
+#define THEAD_C9XX_CSR_ML2WP 0x7f7
+#define THEAD_C9XX_CSR_MDTCMCR 0x7f8
+#define THEAD_C9XX_CSR_USP 0x7d1
+#define THEAD_C9XX_CSR_MCINS 0x7d2
+#define THEAD_C9XX_CSR_MCINDEX 0x7d3
+#define THEAD_C9XX_CSR_MCDATA0 0x7d4
+#define THEAD_C9XX_CSR_MCDATA1 0x7d5
+#define THEAD_C9XX_CSR_MEICR 0x7d6
+#define THEAD_C9XX_CSR_MEICR2 0x7d7
+#define THEAD_C9XX_CSR_MBEADDR 0x7d8
+#define THEAD_C9XX_CSR_MCPUID 0xfc0
+#define THEAD_C9XX_CSR_MAPBADDR 0xfc1
+#define THEAD_C9XX_CSR_MWMSR 0xfc2
+#define THEAD_C9XX_CSR_MHALTCAUSE 0xfe0
+#define THEAD_C9XX_CSR_MDBGINFO 0xfe1
+#define THEAD_C9XX_CSR_MPCFIFO 0xfe2
+
+/* T-HEAD C9xx S mode CSR. */
+#define THEAD_C9XX_CSR_SXSTATUS 0x5c0
+#define THEAD_C9XX_CSR_SHCR 0x5c1
+#define THEAD_C9XX_CSR_SCER2 0x5c2
+#define THEAD_C9XX_CSR_SCER 0x5c3
+#define THEAD_C9XX_CSR_SCOUNTERINTEN 0x5c4
+#define THEAD_C9XX_CSR_SCOUNTEROF 0x5c5
+#define THEAD_C9XX_CSR_SHINT 0x5c6
+#define THEAD_C9XX_CSR_SHINT2 0x5c7
+#define THEAD_C9XX_CSR_SHPMINHIBIT 0x5c8
+#define THEAD_C9XX_CSR_SHPMCR 0x5c9
+#define THEAD_C9XX_CSR_SHPMSR 0x5ca
+#define THEAD_C9XX_CSR_SHPMER 0x5cb
+#define THEAD_C9XX_CSR_SL2CPID 0x5cc
+#define THEAD_C9XX_CSR_SL2WP 0x5cd
+#define THEAD_C9XX_CSR_SBEADDR 0x5d0
+#define THEAD_C9XX_CSR_SCYCLE 0x5e0
+#define THEAD_C9XX_CSR_SHPMCOUNTER1 0x5e1
+#define THEAD_C9XX_CSR_SHPMCOUNTER2 0x5e2
+#define THEAD_C9XX_CSR_SHPMCOUNTER3 0x5e3
+#define THEAD_C9XX_CSR_SHPMCOUNTER4 0x5e4
+#define THEAD_C9XX_CSR_SHPMCOUNTER5 0x5e5
+#define THEAD_C9XX_CSR_SHPMCOUNTER6 0x5e6
+#define THEAD_C9XX_CSR_SHPMCOUNTER7 0x5e7
+#define THEAD_C9XX_CSR_SHPMCOUNTER8 0x5e8
+#define THEAD_C9XX_CSR_SHPMCOUNTER9 0x5e9
+#define THEAD_C9XX_CSR_SHPMCOUNTER10 0x5ea
+#define THEAD_C9XX_CSR_SHPMCOUNTER11 0x5eb
+#define THEAD_C9XX_CSR_SHPMCOUNTER12 0x5ec
+#define THEAD_C9XX_CSR_SHPMCOUNTER13 0x5ed
+#define THEAD_C9XX_CSR_SHPMCOUNTER14 0x5ee
+#define THEAD_C9XX_CSR_SHPMCOUNTER15 0x5ef
+#define THEAD_C9XX_CSR_SHPMCOUNTER16 0x5f0
+#define THEAD_C9XX_CSR_SHPMCOUNTER17 0x5f1
+#define THEAD_C9XX_CSR_SHPMCOUNTER18 0x5f2
+#define THEAD_C9XX_CSR_SHPMCOUNTER19 0x5f3
+#define THEAD_C9XX_CSR_SHPMCOUNTER20 0x5f4
+#define THEAD_C9XX_CSR_SHPMCOUNTER21 0x5f5
+#define THEAD_C9XX_CSR_SHPMCOUNTER22 0x5f6
+#define THEAD_C9XX_CSR_SHPMCOUNTER23 0x5f7
+#define THEAD_C9XX_CSR_SHPMCOUNTER24 0x5f8
+#define THEAD_C9XX_CSR_SHPMCOUNTER25 0x5f9
+#define THEAD_C9XX_CSR_SHPMCOUNTER26 0x5fa
+#define THEAD_C9XX_CSR_SHPMCOUNTER27 0x5fb
+#define THEAD_C9XX_CSR_SHPMCOUNTER28 0x5fc
+#define THEAD_C9XX_CSR_SHPMCOUNTER29 0x5fd
+#define THEAD_C9XX_CSR_SHPMCOUNTER30 0x5fe
+#define THEAD_C9XX_CSR_SHPMCOUNTER31 0x5ff
+
+/* T-HEAD C9xx U mode CSR. */
+#define THEAD_C9XX_CSR_FXCR 0x800
+
+/* T-HEAD C9xx MMU extentions. */
+#define THEAD_C9XX_CSR_SMIR 0x9c0
+#define THEAD_C9XX_CSR_SMEL 0x9c1
+#define THEAD_C9XX_CSR_SMEH 0x9c2
+#define THEAD_C9XX_CSR_SMCIR 0x9c3
+
+/* T-HEAD C9xx Security CSR(May be droped). */
+#define THEAD_C9XX_CSR_MEBR 0xbe0
+#define THEAD_C9XX_CSR_NT_MSTATUS 0xbe1
+#define THEAD_C9XX_CSR_NT_MIE 0xbe2
+#define THEAD_C9XX_CSR_NT_MTVEC 0xbe3
+#define THEAD_C9XX_CSR_NT_MTVT 0xbe4
+#define THEAD_C9XX_CSR_NT_MEPC 0xbe5
+#define THEAD_C9XX_CSR_NT_MCAUSE 0xbe6
+#define THEAD_C9XX_CSR_NT_MIP 0xbe7
+#define THEAD_C9XX_CSR_NT_MINTSTATE 0xbe8
+#define THEAD_C9XX_CSR_NT_MXSTATUS 0xbe9
+#define THEAD_C9XX_CSR_NT_MEBR 0xbea
+#define THEAD_C9XX_CSR_NT_MSP 0xbeb
+#define THEAD_C9XX_CSR_T_USP 0xbec
+#define THEAD_C9XX_CSR_T_MDCR 0xbed
+#define THEAD_C9XX_CSR_T_MPCR 0xbee
+#define THEAD_C9XX_CSR_PMPTEECFG 0xbef
+
+/* T-HEAD C9xx MIP CSR extension */
+#define THEAD_C9XX_IRQ_PMU_OVF 17
+#define THEAD_C9XX_MIP_MOIP (_UL(1) << THEAD_C9XX_IRQ_PMU_OVF)
+
+#endif
--
2.35.1
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