diff options
Diffstat (limited to 'arch/powerpc/boot/4xx.c')
| -rw-r--r-- | arch/powerpc/boot/4xx.c | 272 |
1 files changed, 204 insertions, 68 deletions
diff --git a/arch/powerpc/boot/4xx.c b/arch/powerpc/boot/4xx.c index d16ea10d754..1a83efe274c 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; |