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author | Laurent Pinchart <laurentp@cse-semaphore.com> | 2008-04-10 15:01:27 (GMT) |
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committer | Kumar Gala <galak@kernel.crashing.org> | 2008-04-17 06:01:36 (GMT) |
commit | d464df2667cf181419604e656773f80996cf0470 (patch) | |
tree | fedca2185763550331f0a73450c1d82f0c146ad6 /drivers/serial/cpm_uart/cpm_uart_core.c | |
parent | 1028d4f162796a99b87565b6b40b5fec79c242d0 (diff) | |
download | linux-fsl-qoriq-d464df2667cf181419604e656773f80996cf0470.tar.xz |
[POWERPC] cpm_uart: Allocate DPRAM memory for SMC ports on CPM2-based platforms.
This patch allocates parameter RAM for SMC serial ports without relying on
previous initialisation by a boot loader or a wrapper layer.
SMC parameter RAM on CPM2-based platforms can be allocated anywhere in the
general-purpose areas of the dual-port RAM. The current code relies on the
boot loader to allocate a section of general-purpose CPM RAM and gets the
section address from the device tree.
This patch modifies the device tree address usage to reference the SMC
parameter RAM base pointer instead of a pre-allocated RAM section and
allocates memory from the CPM dual-port RAM when initialising the SMC port.
CPM1-based platforms are not affected.
Signed-off-by: Laurent Pinchart <laurentp@cse-semaphore.com>
Acked-by: Scott Wood <scottwood@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Diffstat (limited to 'drivers/serial/cpm_uart/cpm_uart_core.c')
-rw-r--r-- | drivers/serial/cpm_uart/cpm_uart_core.c | 19 |
1 files changed, 9 insertions, 10 deletions
diff --git a/drivers/serial/cpm_uart/cpm_uart_core.c b/drivers/serial/cpm_uart/cpm_uart_core.c index 236af9d..a638ba0 100644 --- a/drivers/serial/cpm_uart/cpm_uart_core.c +++ b/drivers/serial/cpm_uart/cpm_uart_core.c @@ -966,24 +966,23 @@ static int cpm_uart_init_port(struct device_node *np, if (!mem) return -ENOMEM; - pram = of_iomap(np, 1); - if (!pram) { - ret = -ENOMEM; - goto out_mem; - } - if (of_device_is_compatible(np, "fsl,cpm1-scc-uart") || of_device_is_compatible(np, "fsl,cpm2-scc-uart")) { pinfo->sccp = mem; - pinfo->sccup = pram; + pinfo->sccup = pram = cpm_uart_map_pram(pinfo, np); } else if (of_device_is_compatible(np, "fsl,cpm1-smc-uart") || of_device_is_compatible(np, "fsl,cpm2-smc-uart")) { pinfo->flags |= FLAG_SMC; pinfo->smcp = mem; - pinfo->smcup = pram; + pinfo->smcup = pram = cpm_uart_map_pram(pinfo, np); } else { ret = -ENODEV; - goto out_pram; + goto out_mem; + } + + if (!pram) { + ret = -ENOMEM; + goto out_mem; } pinfo->tx_nrfifos = TX_NUM_FIFO; @@ -1007,7 +1006,7 @@ static int cpm_uart_init_port(struct device_node *np, return cpm_uart_request_port(&pinfo->port); out_pram: - iounmap(pram); + cpm_uart_unmap_pram(pinfo, pram); out_mem: iounmap(mem); return ret; |