aboutsummaryrefslogtreecommitdiff
path: root/hw
diff options
context:
space:
mode:
authorPeter Crosthwaite <crosthwaitepeter@gmail.com>2015-11-03 13:49:41 +0000
committerPeter Maydell <peter.maydell@linaro.org>2015-11-03 13:49:41 +0000
commitc3a9a689c6ff07ba2e00bafc68626fad84587794 (patch)
tree2bcad33a6cb8a0fba2882c7d6d26cef1006b4d3b /hw
parent10b8ec73e610e017ac2fbaf486fce21eec7061b2 (diff)
arm: xilinx_zynq: Add linux pre-boot
Add a Linux-specific pre-boot routine that matches the device- specific bootloaders behaviour. This is needed for modern Linux that expects the ARM PLL in SLCR to be a more even value (not 26). Cc: Alistair Francis <alistair.francis@xilinx.com> Signed-off-by: Peter Crosthwaite <crosthwaite.peter@gmail.com> Message-id: 9a9025ea65572586b50dca4e5819032e3c436d64.1446182614.git.crosthwaite.peter@gmail.com Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Diffstat (limited to 'hw')
-rw-r--r--hw/arm/xilinx_zynq.c42
1 files changed, 42 insertions, 0 deletions
diff --git a/hw/arm/xilinx_zynq.c b/hw/arm/xilinx_zynq.c
index 9f89483d6a..82a9db8120 100644
--- a/hw/arm/xilinx_zynq.c
+++ b/hw/arm/xilinx_zynq.c
@@ -43,6 +43,45 @@ static const int dma_irqs[8] = {
46, 47, 48, 49, 72, 73, 74, 75
};
+#define BOARD_SETUP_ADDR 0x100
+
+#define SLCR_LOCK_OFFSET 0x004
+#define SLCR_UNLOCK_OFFSET 0x008
+#define SLCR_ARM_PLL_OFFSET 0x100
+
+#define SLCR_XILINX_UNLOCK_KEY 0xdf0d
+#define SLCR_XILINX_LOCK_KEY 0x767b
+
+#define ARMV7_IMM16(x) (extract32((x), 0, 12) | \
+ extract32((x), 12, 4) << 16)
+
+/* Write immediate val to address r0 + addr. r0 should contain base offset
+ * of the SLCR block. Clobbers r1.
+ */
+
+#define SLCR_WRITE(addr, val) \
+ 0xe3001000 + ARMV7_IMM16(extract32((val), 0, 16)), /* movw r1 ... */ \
+ 0xe3401000 + ARMV7_IMM16(extract32((val), 16, 16)), /* movt r1 ... */ \
+ 0xe5801000 + (addr)
+
+static void zynq_write_board_setup(ARMCPU *cpu,
+ const struct arm_boot_info *info)
+{
+ int n;
+ uint32_t board_setup_blob[] = {
+ 0xe3a004f8, /* mov r0, #0xf8000000 */
+ SLCR_WRITE(SLCR_UNLOCK_OFFSET, SLCR_XILINX_UNLOCK_KEY),
+ SLCR_WRITE(SLCR_ARM_PLL_OFFSET, 0x00014008),
+ SLCR_WRITE(SLCR_LOCK_OFFSET, SLCR_XILINX_LOCK_KEY),
+ 0xe12fff1e, /* bx lr */
+ };
+ for (n = 0; n < ARRAY_SIZE(board_setup_blob); n++) {
+ board_setup_blob[n] = tswap32(board_setup_blob[n]);
+ }
+ rom_add_blob_fixed("board-setup", board_setup_blob,
+ sizeof(board_setup_blob), BOARD_SETUP_ADDR);
+}
+
static struct arm_boot_info zynq_binfo = {};
static void gem_init(NICInfo *nd, uint32_t base, qemu_irq irq)
@@ -252,6 +291,9 @@ static void zynq_init(MachineState *machine)
zynq_binfo.nb_cpus = 1;
zynq_binfo.board_id = 0xd32;
zynq_binfo.loader_start = 0;
+ zynq_binfo.board_setup_addr = BOARD_SETUP_ADDR;
+ zynq_binfo.write_board_setup = zynq_write_board_setup;
+
arm_load_kernel(ARM_CPU(first_cpu), &zynq_binfo);
}