[U-Boot] [PATCH v3 07/15] cpu: add CPU driver for Broadcom MIPS SoCs

Álvaro Fernández Rojas
2017-04-18T20:38:36Z

v3: Several improvements:
- Probe driver correctly.
- Allocate size for priv struct.
- Cosmetic fixes.
v2: Introduce changes suggested by Daniel Schwierzeck:
- Split BMIPS support patches.
- Get register base from DT.

drivers/cpu/Makefile | 2 +
drivers/cpu/bmips_cpu.c | 280 ++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 282 insertions(+)
create mode 100644 drivers/cpu/bmips_cpu.c

diff --git a/drivers/cpu/Makefile b/drivers/cpu/Makefile
index 8710160..db515f6 100644
--- a/drivers/cpu/Makefile
+++ b/drivers/cpu/Makefile
@@ -5,3 +5,5 @@
# SPDX-License-Identifier: GPL-2.0+
#
obj-$(CONFIG_CPU) += cpu-uclass.o
+
+obj-$(CONFIG_ARCH_BMIPS) += bmips_cpu.o
diff --git a/drivers/cpu/bmips_cpu.c b/drivers/cpu/bmips_cpu.c
new file mode 100644
index 0000000..d95f51a
--- /dev/null
+++ b/drivers/cpu/bmips_cpu.c
@@ -0,0 +1,280 @@
+/*
+ * Copyright (C) 2017 Álvaro Fernández Rojas <noltari@gmail.com>
+ *
+ * Derived from linux/arch/mips/bcm63xx/cpu.c:
+ * Copyright (C) 2008 Maxime Bizon <mbizon@freebox.fr>
+ * Copyright (C) 2009 Florian Fainelli <florian@openwrt.org>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <cpu.h>
+#include <dm.h>
+#include <errno.h>
+#include <asm/io.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+#define REV_CHIPID_SHIFT 16
+#define REV_CHIPID_MASK (0xffff << REV_CHIPID_SHIFT)
+#define REV_REVID_SHIFT 0
+#define REV_REVID_MASK (0xff << REV_REVID_SHIFT)
+
+#define REG_BCM6328_OTP 0x62c
+#define BCM6328_TP1_DISABLED BIT(9)
+
+#define REG_BCM6328_MISC_STRAPBUS 0x1a40
+#define STRAPBUS_6328_FCVO_SHIFT 7
+#define STRAPBUS_6328_FCVO_MASK (0x1f << STRAPBUS_6328_FCVO_SHIFT)
+
+#define REG_BCM6358_DDR_DMIPSPLLCFG 0x12b8
+#define DMIPSPLLCFG_6358_M1_SHIFT 0
+#define DMIPSPLLCFG_6358_M1_MASK (0xff << DMIPSPLLCFG_6358_M1_SHIFT)
+#define DMIPSPLLCFG_6358_N1_SHIFT 23
+#define DMIPSPLLCFG_6358_N1_MASK (0x3f << DMIPSPLLCFG_6358_N1_SHIFT)
+#define DMIPSPLLCFG_6358_N2_SHIFT 29
+#define DMIPSPLLCFG_6358_N2_MASK (0x7 << DMIPSPLLCFG_6358_N2_SHIFT)
+
+#define REG_BCM63268_MISC_STRAPBUS 0x1814
+#define STRAPBUS_63268_FCVO_SHIFT 21
+#define STRAPBUS_63268_FCVO_MASK (0xf << STRAPBUS_63268_FCVO_SHIFT)
+
+struct bmips_cpu_priv;
+
+struct bmips_cpu_hw {
+ ulong (*get_cpu_freq)(struct bmips_cpu_priv *);
+ int (*get_cpu_count)(struct bmips_cpu_priv *);
+};
+
+struct bmips_cpu_priv {
+ void __iomem *regs;
+ const struct bmips_cpu_hw *hw;
+};
+
+/* Specific CPU Ops */
+static ulong bcm6328_get_cpu_freq(struct bmips_cpu_priv *priv)
+{
+ unsigned int mips_pll_fcvo;
+
+ mips_pll_fcvo = __raw_readl(priv->regs + REG_BCM6328_MISC_STRAPBUS);
+ mips_pll_fcvo = (mips_pll_fcvo & STRAPBUS_6328_FCVO_MASK)
+ >> STRAPBUS_6328_FCVO_SHIFT;
+
+ switch (mips_pll_fcvo) {
+ case 0x12:
+ case 0x14:
+ case 0x19:
+ return 160000000;
+ case 0x1c:
+ return 192000000;
+ case 0x13:
+ case 0x15:
+ return 200000000;
+ case 0x1a:
+ return 384000000;
+ case 0x16:
+ return 400000000;
+ default:
+ return 320000000;
+ }
+}
+
+static ulong bcm6358_get_cpu_freq(struct bmips_cpu_priv *priv)
+{
+ unsigned int tmp, n1, n2, m1;
+
+ tmp = __raw_readl(priv->regs + REG_BCM6358_DDR_DMIPSPLLCFG);
+ n1 = (tmp & DMIPSPLLCFG_6358_N1_MASK) >> DMIPSPLLCFG_6358_N1_SHIFT;
+ n2 = (tmp & DMIPSPLLCFG_6358_N2_MASK) >> DMIPSPLLCFG_6358_N2_SHIFT;
+ m1 = (tmp & DMIPSPLLCFG_6358_M1_MASK) >> DMIPSPLLCFG_6358_M1_SHIFT;
+
+ return (16 * 1000000 * n1 * n2) / m1;
+}
+
+static ulong bcm63268_get_cpu_freq(struct bmips_cpu_priv *priv)
+{
+ unsigned mips_pll_fcvo;
+
+ mips_pll_fcvo = __raw_readl(priv->regs + REG_BCM63268_MISC_STRAPBUS);
+ mips_pll_fcvo = (mips_pll_fcvo & STRAPBUS_63268_FCVO_MASK)
+ >> STRAPBUS_63268_FCVO_SHIFT;
+
+ switch (mips_pll_fcvo) {
+ case 0x3:
+ case 0xe:
+ return 320000000;
+ case 0xa:
+ return 333000000;
+ case 0x2:
+ case 0xb:
+ case 0xf:
+ return 400000000;
+ default:
+ return 0;
+ }
+}
+
+static int bcm6328_get_cpu_count(struct bmips_cpu_priv *priv)
+{
+ u32 val = __raw_readl(priv->regs + REG_BCM6328_OTP);
+
+ if (val & BCM6328_TP1_DISABLED)
+ return 1;
+ else
+ return 2;
+}
+
+static int bcm6358_get_cpu_count(struct bmips_cpu_priv *priv)
+{
+ return 2;
+}
+
+static const struct bmips_cpu_hw bmips_cpu_bcm6328 = {
+ .get_cpu_freq = bcm6328_get_cpu_freq,
+ .get_cpu_count = bcm6328_get_cpu_count,
+};
+
+static const struct bmips_cpu_hw bmips_cpu_bcm6358 = {
+ .get_cpu_freq = bcm6358_get_cpu_freq,
+ .get_cpu_count = bcm6358_get_cpu_count,
+};
+
+static const struct bmips_cpu_hw bmips_cpu_bcm63268 = {
+ .get_cpu_freq = bcm63268_get_cpu_freq,
+ .get_cpu_count = bcm6358_get_cpu_count,
+};
+
+/* Generic CPU Ops */
+static int bmips_cpu_get_desc(struct udevice *dev, char *buf, int size)
+{
+ struct bmips_cpu_priv *priv = dev_get_priv(dev);
+ u32 cpu_revid;
+ u16 cpu_id;
+ u8 cpu_rev;
+
+ cpu_revid = __raw_readl(priv->regs);
+ cpu_id = (cpu_revid & REV_CHIPID_MASK) >> REV_CHIPID_SHIFT;
+ cpu_rev = (cpu_revid & REV_REVID_MASK) >> REV_REVID_SHIFT;
+
+ snprintf(buf, size, "BCM%04X%02X", cpu_id, cpu_rev);
+
+ return 0;
+}
+
+static int bmips_cpu_get_info(struct udevice *dev, struct cpu_info *info)
+{
+ struct bmips_cpu_priv *priv = dev_get_priv(dev);
+ const struct bmips_cpu_hw *hw = priv->hw;
+
+ info->cpu_freq = hw->get_cpu_freq(priv);
+ info->features = BIT(CPU_FEAT_L1_CACHE);
+ info->features |= BIT(CPU_FEAT_MMU);
+ info->features |= BIT(CPU_FEAT_DEVICE_ID);
+
+ return 0;
+}
+
+static int bmips_cpu_get_count(struct udevice *dev)
+{
+ struct bmips_cpu_priv *priv = dev_get_priv(dev);
+ const struct bmips_cpu_hw *hw = priv->hw;
+
+ return hw->get_cpu_count(priv);
+}
+
+static int bmips_cpu_get_vendor(struct udevice *dev, char *buf, int size)
+{
+ snprintf(buf, size, "Broadcom");
+
+ return 0;
+}
+
+static const struct cpu_ops bmips_cpu_ops = {
+ .get_desc = bmips_cpu_get_desc,
+ .get_info = bmips_cpu_get_info,
+ .get_count = bmips_cpu_get_count,
+ .get_vendor = bmips_cpu_get_vendor,
+};
+
+/* BMIPS CPU driver */
+int bmips_cpu_bind(struct udevice *dev)
+{
+ struct cpu_platdata *plat = dev_get_parent_platdata(dev);
+
+ plat->cpu_id = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev),
+ "reg", -1);
+ plat->device_id = read_c0_prid();
+
+ return 0;
+}
+
+int bmips_cpu_probe(struct udevice *dev)
+{
+ struct bmips_cpu_priv *priv = dev_get_priv(dev);
+ const struct bmips_cpu_hw *hw =
+ (const struct bmips_cpu_hw *)dev_get_driver_data(dev);
+ fdt_addr_t addr;
+ fdt_size_t size;
+
+ addr = dev_get_addr_size_index(dev_get_parent(dev), 0, &size);
+ if (addr == FDT_ADDR_T_NONE)
+ return -EINVAL;
+
+ priv->regs = ioremap(addr, size);
+ priv->hw = hw;
+
+ return 0;
+}
+
+static const struct udevice_id bmips_cpu_ids[] = {
+ {
+ .compatible = "brcm,bcm6328-cpu",
+ .data = (ulong)&bmips_cpu_bcm6328,
+ }, {
+ .compatible = "brcm,bcm6358-cpu",
+ .data = (ulong)&bmips_cpu_bcm6358,
+ }, {
+ .compatible = "brcm,bcm63268-cpu",
+ .data = (ulong)&bmips_cpu_bcm63268,
+ },
+ { /* sentinel */ }
+};
+
+U_BOOT_DRIVER(bmips_cpu_drv) = {
+ .name = "bmips_cpu",
+ .id = UCLASS_CPU,
+ .of_match = bmips_cpu_ids,
+ .bind = bmips_cpu_bind,
+ .probe = bmips_cpu_probe,
+ .priv_auto_alloc_size = sizeof(struct bmips_cpu_priv),
+ .ops = &bmips_cpu_ops,
+ .flags = DM_FLAG_PRE_RELOC,
+};
+
+#ifdef CONFIG_DISPLAY_CPUINFO
+int print_cpuinfo(void)
+{
+ struct cpu_info cpu;
+ struct udevice *dev;
+ int err;
+ char desc[100];
+
+ err = uclass_get_device(UCLASS_CPU, 0, &dev);
+ if (err)
+ return 0;
+
+ err = cpu_get_info(dev, &cpu);
+ if (err)
+ return 0;
+
+ err = cpu_get_desc(dev, desc, sizeof(desc));
+ if (err)
+ return 0;
+
+ printf("Chip ID: %s, MIPS: ", desc);
+ print_freq(cpu.cpu_freq, "\n");
+
+ return 0;
+}
+#endif
--
2.1.4