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-rw-r--r--arch/powerpc/boot/4xx.c272
1 files changed, 204 insertions, 68 deletions
diff --git a/arch/powerpc/boot/4xx.c b/arch/powerpc/boot/4xx.c
index d16ea10d7546..1a83efe274c1 100644
--- a/arch/powerpc/boot/4xx.c
+++ b/arch/powerpc/boot/4xx.c
@@ -275,89 +275,225 @@ void ibm4xx_fixup_ebc_ranges(const char *ebc)
setprop(devp, "ranges", ranges, (p - ranges) * sizeof(u32));
}
-#define SPRN_CCR1 0x378
-void ibm440ep_fixup_clocks(unsigned int sysclk, unsigned int ser_clk)
+/* Calculate 440GP clocks */
+void ibm440gp_fixup_clocks(unsigned int sys_clk, unsigned int ser_clk)
{
- u32 cpu, plb, opb, ebc, tb, uart0, m, vco;
- u32 reg;
- u32 fwdva, fwdvb, fbdv, lfbdv, opbdv0, perdv0, spcid0, prbdv0, tmp;
-
- mtdcr(DCRN_CPR0_ADDR, CPR0_PLLD0);
- reg = mfdcr(DCRN_CPR0_DATA);
- tmp = (reg & 0x000F0000) >> 16;
- fwdva = tmp ? tmp : 16;
- tmp = (reg & 0x00000700) >> 8;
- fwdvb = tmp ? tmp : 8;
- tmp = (reg & 0x1F000000) >> 24;
- fbdv = tmp ? tmp : 32;
- lfbdv = (reg & 0x0000007F);
-
- mtdcr(DCRN_CPR0_ADDR, CPR0_OPBD0);
- reg = mfdcr(DCRN_CPR0_DATA);
- tmp = (reg & 0x03000000) >> 24;
- opbdv0 = tmp ? tmp : 4;
-
- mtdcr(DCRN_CPR0_ADDR, CPR0_PERD0);
- reg = mfdcr(DCRN_CPR0_DATA);
- tmp = (reg & 0x07000000) >> 24;
- perdv0 = tmp ? tmp : 8;
-
- mtdcr(DCRN_CPR0_ADDR, CPR0_PRIMBD0);
- reg = mfdcr(DCRN_CPR0_DATA);
- tmp = (reg & 0x07000000) >> 24;
- prbdv0 = tmp ? tmp : 8;
-
- mtdcr(DCRN_CPR0_ADDR, CPR0_SCPID);
- reg = mfdcr(DCRN_CPR0_DATA);
- tmp = (reg & 0x03000000) >> 24;
- spcid0 = tmp ? tmp : 4;
-
- /* Calculate M */
- mtdcr(DCRN_CPR0_ADDR, CPR0_PLLC0);
- reg = mfdcr(DCRN_CPR0_DATA);
- tmp = (reg & 0x03000000) >> 24;
- if (tmp == 0) { /* PLL output */
- tmp = (reg & 0x20000000) >> 29;
- if (!tmp) /* PLLOUTA */
- m = fbdv * lfbdv * fwdva;
+ u32 sys0 = mfdcr(DCRN_CPC0_SYS0);
+ u32 cr0 = mfdcr(DCRN_CPC0_CR0);
+ u32 cpu, plb, opb, ebc, tb, uart0, uart1, m;
+ u32 opdv = CPC0_SYS0_OPDV(sys0);
+ u32 epdv = CPC0_SYS0_EPDV(sys0);
+
+ if (sys0 & CPC0_SYS0_BYPASS) {
+ /* Bypass system PLL */
+ cpu = plb = sys_clk;
+ } else {
+ if (sys0 & CPC0_SYS0_EXTSL)
+ /* PerClk */
+ m = CPC0_SYS0_FWDVB(sys0) * opdv * epdv;
else
- m = fbdv * lfbdv * fwdvb;
+ /* CPU clock */
+ m = CPC0_SYS0_FBDV(sys0) * CPC0_SYS0_FWDVA(sys0);
+ cpu = sys_clk * m / CPC0_SYS0_FWDVA(sys0);
+ plb = sys_clk * m / CPC0_SYS0_FWDVB(sys0);
}
- else if (tmp == 1) /* CPU output */
- m = fbdv * fwdva;
+
+ opb = plb / opdv;
+ ebc = opb / epdv;
+
+ /* FIXME: Check if this is for all 440GP, or just Ebony */
+ if ((mfpvr() & 0xf0000fff) == 0x40000440)
+ /* Rev. B 440GP, use external system clock */
+ tb = sys_clk;
else
- m = perdv0 * opbdv0 * fwdvb;
+ /* Rev. C 440GP, errata force us to use internal clock */
+ tb = cpu;
- vco = (m * sysclk) + (m >> 1);
- cpu = vco / fwdva;
- plb = vco / fwdvb / prbdv0;
- opb = plb / opbdv0;
- ebc = plb / perdv0;
+ if (cr0 & CPC0_CR0_U0EC)
+ /* External UART clock */
+ uart0 = ser_clk;
+ else
+ /* Internal UART clock */
+ uart0 = plb / CPC0_CR0_UDIV(cr0);
+
+ if (cr0 & CPC0_CR0_U1EC)
+ /* External UART clock */
+ uart1 = ser_clk;
+ else
+ /* Internal UART clock */
+ uart1 = plb / CPC0_CR0_UDIV(cr0);
+
+ printf("PPC440GP: SysClk = %dMHz (%x)\n\r",
+ (sys_clk + 500000) / 1000000, sys_clk);
+
+ dt_fixup_cpu_clocks(cpu, tb, 0);
+
+ dt_fixup_clock("/plb", plb);
+ dt_fixup_clock("/plb/opb", opb);
+ dt_fixup_clock("/plb/opb/ebc", ebc);
+ dt_fixup_clock("/plb/opb/serial@40000200", uart0);
+ dt_fixup_clock("/plb/opb/serial@40000300", uart1);
+}
+
+#define SPRN_CCR1 0x378
+
+static inline u32 __fix_zero(u32 v, u32 def)
+{
+ return v ? v : def;
+}
+
+static unsigned int __ibm440eplike_fixup_clocks(unsigned int sys_clk,
+ unsigned int tmr_clk,
+ int per_clk_from_opb)
+{
+ /* PLL config */
+ u32 pllc = CPR0_READ(DCRN_CPR0_PLLC);
+ u32 plld = CPR0_READ(DCRN_CPR0_PLLD);
+
+ /* Dividers */
+ u32 fbdv = __fix_zero((plld >> 24) & 0x1f, 32);
+ u32 fwdva = __fix_zero((plld >> 16) & 0xf, 16);
+ u32 fwdvb = __fix_zero((plld >> 8) & 7, 8);
+ u32 lfbdv = __fix_zero(plld & 0x3f, 64);
+ u32 pradv0 = __fix_zero((CPR0_READ(DCRN_CPR0_PRIMAD) >> 24) & 7, 8);
+ u32 prbdv0 = __fix_zero((CPR0_READ(DCRN_CPR0_PRIMBD) >> 24) & 7, 8);
+ u32 opbdv0 = __fix_zero((CPR0_READ(DCRN_CPR0_OPBD) >> 24) & 3, 4);
+ u32 perdv0 = __fix_zero((CPR0_READ(DCRN_CPR0_PERD) >> 24) & 3, 4);
+
+ /* Input clocks for primary dividers */
+ u32 clk_a, clk_b;
+
+ /* Resulting clocks */
+ u32 cpu, plb, opb, ebc, vco;
+
+ /* Timebase */
+ u32 ccr1, tb = tmr_clk;
+
+ if (pllc & 0x40000000) {
+ u32 m;
+
+ /* Feedback path */
+ switch ((pllc >> 24) & 7) {
+ case 0:
+ /* PLLOUTx */
+ m = ((pllc & 0x20000000) ? fwdvb : fwdva) * lfbdv;
+ break;
+ case 1:
+ /* CPU */
+ m = fwdva * pradv0;
+ break;
+ case 5:
+ /* PERClk */
+ m = fwdvb * prbdv0 * opbdv0 * perdv0;
+ break;
+ default:
+ printf("WARNING ! Invalid PLL feedback source !\n");
+ goto bypass;
+ }
+ m *= fbdv;
+ vco = sys_clk * m;
+ clk_a = vco / fwdva;
+ clk_b = vco / fwdvb;
+ } else {
+bypass:
+ /* Bypass system PLL */
+ vco = 0;
+ clk_a = clk_b = sys_clk;
+ }
- /* FIXME */
- uart0 = ser_clk;
+ cpu = clk_a / pradv0;
+ plb = clk_b / prbdv0;
+ opb = plb / opbdv0;
+ ebc = (per_clk_from_opb ? opb : plb) / perdv0;
/* Figure out timebase. Either CPU or default TmrClk */
- asm volatile (
- "mfspr %0,%1\n"
- :
- "=&r"(reg) : "i"(SPRN_CCR1));
- if (reg & 0x0080)
- tb = 25000000; /* TmrClk is 25MHz */
- else
+ ccr1 = mfspr(SPRN_CCR1);
+
+ /* If passed a 0 tmr_clk, force CPU clock */
+ if (tb == 0) {
+ ccr1 &= ~0x80u;
+ mtspr(SPRN_CCR1, ccr1);
+ }
+ if ((ccr1 & 0x0080) == 0)
tb = cpu;
dt_fixup_cpu_clocks(cpu, tb, 0);
dt_fixup_clock("/plb", plb);
dt_fixup_clock("/plb/opb", opb);
dt_fixup_clock("/plb/opb/ebc", ebc);
- dt_fixup_clock("/plb/opb/serial@ef600300", uart0);
- dt_fixup_clock("/plb/opb/serial@ef600400", uart0);
- dt_fixup_clock("/plb/opb/serial@ef600500", uart0);
- dt_fixup_clock("/plb/opb/serial@ef600600", uart0);
+
+ return plb;
+}
+
+static void eplike_fixup_uart_clk(int index, const char *path,
+ unsigned int ser_clk,
+ unsigned int plb_clk)
+{
+ unsigned int sdr;
+ unsigned int clock;
+
+ switch (index) {
+ case 0:
+ sdr = SDR0_READ(DCRN_SDR0_UART0);
+ break;
+ case 1:
+ sdr = SDR0_READ(DCRN_SDR0_UART1);
+ break;
+ case 2:
+ sdr = SDR0_READ(DCRN_SDR0_UART2);
+ break;
+ case 3:
+ sdr = SDR0_READ(DCRN_SDR0_UART3);
+ break;
+ default:
+ return;
+ }
+
+ if (sdr & 0x00800000u)
+ clock = ser_clk;
+ else
+ clock = plb_clk / __fix_zero(sdr & 0xff, 256);
+
+ dt_fixup_clock(path, clock);
+}
+
+void ibm440ep_fixup_clocks(unsigned int sys_clk,
+ unsigned int ser_clk,
+ unsigned int tmr_clk)
+{
+ unsigned int plb_clk = __ibm440eplike_fixup_clocks(sys_clk, tmr_clk, 0);
+
+ /* serial clocks beed fixup based on int/ext */
+ eplike_fixup_uart_clk(0, "/plb/opb/serial@ef600300", ser_clk, plb_clk);
+ eplike_fixup_uart_clk(1, "/plb/opb/serial@ef600400", ser_clk, plb_clk);
+ eplike_fixup_uart_clk(2, "/plb/opb/serial@ef600500", ser_clk, plb_clk);
+ eplike_fixup_uart_clk(3, "/plb/opb/serial@ef600600", ser_clk, plb_clk);
+}
+
+void ibm440gx_fixup_clocks(unsigned int sys_clk,
+ unsigned int ser_clk,
+ unsigned int tmr_clk)
+{
+ unsigned int plb_clk = __ibm440eplike_fixup_clocks(sys_clk, tmr_clk, 1);
+
+ /* serial clocks beed fixup based on int/ext */
+ eplike_fixup_uart_clk(0, "/plb/opb/serial@40000200", ser_clk, plb_clk);
+ eplike_fixup_uart_clk(1, "/plb/opb/serial@40000300", ser_clk, plb_clk);
+}
+
+void ibm440spe_fixup_clocks(unsigned int sys_clk,
+ unsigned int ser_clk,
+ unsigned int tmr_clk)
+{
+ unsigned int plb_clk = __ibm440eplike_fixup_clocks(sys_clk, tmr_clk, 1);
+
+ /* serial clocks beed fixup based on int/ext */
+ eplike_fixup_uart_clk(0, "/plb/opb/serial@10000200", ser_clk, plb_clk);
+ eplike_fixup_uart_clk(1, "/plb/opb/serial@10000300", ser_clk, plb_clk);
+ eplike_fixup_uart_clk(2, "/plb/opb/serial@10000600", ser_clk, plb_clk);
}
-void ibm405gp_fixup_clocks(unsigned int sysclk, unsigned int ser_clk)
+void ibm405gp_fixup_clocks(unsigned int sys_clk, unsigned int ser_clk)
{
u32 pllmr = mfdcr(DCRN_CPC0_PLLMR);
u32 cpc0_cr0 = mfdcr(DCRN_405_CPC0_CR0);
@@ -374,7 +510,7 @@ void ibm405gp_fixup_clocks(unsigned int sysclk, unsigned int ser_clk)
m = fwdv * fbdv * cbdv;
- cpu = sysclk * m / fwdv;
+ cpu = sys_clk * m / fwdv;
plb = cpu / cbdv;
opb = plb / opdv;
ebc = plb / epdv;
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.